Hello my name is Jeffrey Martin. I am the co-founder CEO of Mosaic. There should be a video that will be playing soon. So our company is based in Prague in the Czech Republic. A little bit about me. I've been involved in 360 degree imaging since 2004. I created one of the internet's first websites combining maps with geo-referenced photos back in 2005. And then I started my first company out of that which predated Google Street View by a couple of years combining the world 360 photos with with Google Maps. There's me without any gray hair just to show you how long I've been in this game. So after starting a company building VR virtual reality cameras for cinema in 2015 I pivoted and started Mosaic which is building the world's best mobile mapping cameras. We found a gap in the market where there was a lot of activity in the geospatial space but there were very very few actual solutions for making the images themselves. We've been shipping our cameras since 2020. We're a bootstrapped company of about 20 people and since 2020 we've grown to the point where we're shipping cameras to over 50 countries in the world to some of the world's hottest, coldest, dustiest, bumpiest places. We have not yet had any cameras returned to us for any functional RMA issues. So we build truly durable cameras that can withstand all of the elements. We are also integrating our cameras with some of the world's most respectable LiDAR companies including Regal and Trimble. We're also talking to Leica Geosystems about the same thing. We've been integrated with Regal for about a year now and we have quite a few of their customers all over the world who are combining our cameras with their systems. Essentially what they are using our cameras for is to color their point clouds. So we connect our camera to their LiDAR with our auxiliary port which allows the Regal device to tell our camera when it should supply images to the LiDAR in order to create a colored point cloud and we've gotten the synchronization of this down to a few hundred nanoseconds. So this allows extremely accurate coloring of point clouds. What you see here is a nerf, a neural radiance field that was made with our Viking camera. The Viking camera is the world's highest resolution mobile mapping camera at 186 megapixels. A neural radiance field if you don't know is similar to photogrammetry but not the same. It allows a much better representation of like a fly-through video kind of thing. This is Prague Old Town Square. This was made entirely with photogrammetry without the use of any drones or LiDAR. The accuracy of this is sub-centimeter and we're very proud of the fact that we're able to create extremely accurate photogrammetric models using our cameras without the use of additional sensors such as LiDAR or drones. Although you can of course combine our camera with such sensors. We've in addition to working in the geospatial industry we've been doing quite a bit of work in the visual effects industry which is starting to I would say merge in a lot of ways with the geospatial industry. They have a lot of similar demands and use cases in terms of duplicating the real world to a sub-centimeter accurate 3D model for the use of visualizations. This 3D model is a cathedral in the Czech Republic that was captured in six minutes time again without the use of any drones or LiDAR. So in six minutes we were able to create this extremely accurate 3D photogrammetric model that would normally take you know many hours in terms of data collection using either traditional photogrammetry techniques or terrestrial laser scanners or things like that. As you can see the mesh is extremely accurate and can allow measurements for the purpose of you know heritage applications reconstruction and things like that. Our most popular camera is the Mosaic X which combines six 12 megapixel global shutter sensors in an all-in-one device that's about this big about the size of your head. In contrast to other similar products such as the ladybug six it is a completely standalone device so it has its own computer inside it has its own GNSS device it has its own IMU and its own storage device so it does not require the connection to any other external computer or device in order to be completely operational and this is quite a contrast to other similar products on the market. This allows a real one-person operation where in you know similar mobile mapping setups you typically have at least a couple of people who need to take care of all the equipment and the car and the mounting and the dismounting our solution is extremely easy you connect the camera to the car you connect the power and you turn it on the the web UI can be controlled by your mobile phone and it allows the real-time monitoring of of the images as well as the GNSS status the storage status and things like that. The images can be auto exposure or manual exposure and the triggering of the camera can be done by an external device so you can connect an external device to the camera such as a wheel encoder an external lidar or an external GNSS or you can have the camera itself do triggering by its internal GNSS allowing you to trigger an image every meter or every five meters or every 50 meters or what have you. You can also do a constant frame rate in the case of GNSS denied environments. As far as the GNSS goes the GNSS device inside our camera is a standard one but we have integrated with other external devices such as Trimble and M-Lid allowing RTK accuracy. Our Viking device our Viking camera as I mentioned before it's the world's highest resolution mobile mapping camera at 186 megapixels and this allows 20k resolution panoramas. This device has been used extensively in Scandinavia for mapping various cities in Finland and Norway as well as in the United Kingdom. This device is a great pairing with high-end lidar such as Regal or Trimble if you want the ultimate accuracy in terms of laser accuracy and image resolution.


G'day mate 40 here So I've been listening to some talks by Leah Greenfield. She's a sociologist and Professor of political science and She's written a bunch of books on nationalism and I found them quite so all-provoking and so I'm thinking about I've got extensive background in religion, right? I was raised a seventh-day Adventist son of a preacher man end up converting to orthodox Judaism and I noticed in religion that there are some There are some unbalanced people with an unbalanced passion and attachment to to their religion that's just you know kind of out of whack and what's going on here and often is people who are losing in the rest of life and By embracing their religion 100% they get to be a winner, right? They get to Really have things going on They get to get to be much more impressive and so Joining a religion can shore up someone with a weak sense of self. I converted to orthodox Judaism. It gave me more clear sense of self In that many of my choices are now determined for me if I live by the the precepts of orthodox Judaism But you see this in our religions people who are losing in the rest of life But the very hardcore in their religious commitment Then I also notice many racial nationalists We're also devoid of accomplishments in other areas of life. So if you're an accomplished architect, right? You'll get a sense of Feeling good about yourself from your accomplishments in architecture And if you're an accomplished architect, you probably have other reasons to feel good about yourself. You probably have a family and friends and community and Education right so you have all these different reasons to feel good about yourself And if you're an accomplished dentist, all right, you're gonna feel proud of your dental accomplishments your education Probably have a family They probably have a steam in the community. You probably pay taxes donate money So you have all these different reasons to feel good about yourself. So you notice with people who are Very passionate about their racial nationalism, whether it's white or black or Mexican Whatever the variety of nationalism that the of racial nationalism that they're very much into It's 99% of the time is people devoid of accomplishment so people looking to shore up their self-esteem and if you don't have any objective reasons to feel good about yourself then you'll have to Make something up So it can be a story you tell yourself about your religion You can go join a cult where people celebrate you just for joining their cult or You can say look, you know, what makes me so awesome are these things that you can't see all right I don't have any visible accomplishments but my blood Makes me special my attachment to my soil makes me special So Leah Greenfield makes this point in the 19th century when you had nationalism rising throughout Europe that Nations like France that a lot to be proud of and nations like Spain that a lot to be proud of But there are other nations like Germany and Russia at the time beginning in the 19th century. They didn't have any objective Reasons to be proud of their nation and so when you don't have any objective reasons to be proud of your nation Then it makes sense to develop. Oh, I'm proud of my my nation for reasons. You can't see it's because of my blood It's because of my race. It's because of my attachment to my soil So when you had these nations such as Germany and Russia that had no objective reason to take pride in their national Identity in the early 19th century That's where blood and soil nationalism developed and you see that's where blood and soil nationalism still thrives It's among people with very little accomplishment now Some level of attachment to to blood and to soil it makes sense.  What's going on? so Having a look at the chat Jim Balan says Luke it's Friday 10 45 p.m. Here in Sydney. I'm still working mate. What are you doing and streaming? What is the time in LA? Yes coming up on 6 a.m. So I woke up at 5 0 6 a.m. And And last night I was preparing to do this stream and I just got sleepy and tired about at about What 8 30 9 p.m. I was all planning to do this stream and then I just got too tired went to bed And then I woke up and it's still on my mind. So I wanted to talk about this so I Like the the books on nationalism by Leah Greenfield She says that nationalism is simply a national consciousness Right and you almost can't help developing a national consciousness So you almost can't help being a nationalist but you probably won't want to call it nationalist because Nationalist got a dirty name after World War two and She also makes the argument that the Nazis were not fascist because fascism is not racial So fascism is a collective national identity That's her definition of fascism Which is interesting and Nazism. She says it's something completely different from fascism Because Nazism was based on racial identity So of course we're going to feel more in common with people who are more similar to us, but if your Primary attachment in life is to your race, then there's probably something missing in your life. You probably lacking coherent sense of family Career education community all these other things that normally make up somebody's self-esteem Judas says haven't slept in 24 hours once or twice a month having insomnia attack and I stay stay awake all night Not at minion because it's very early and I shouldn't leave the house at such an early hour in case I get attacked Yeah, it's a much more dangerous life in In LA and New York City and Chicago San Francisco these days compared to just three years ago so The Greenfield says that England was the first Nation to develop a sense of itself and as a result of the War of the Roses much of the aristocracy got wiped out So prior to nationalism in in Christian Europe People were born into a certain order. You're born into the nobility. You're born into The plebs right just the the regular people and then there was also a priestly class and Your lot in life was largely determined for you then after the Black Death Right when a third of Europe died there was much more need for workers real wages rose In England the War of the Roses wiped out much the nobility so all these people who weren't nobles became nobles and Then you had the development of this national consciousness. So until 16th 17th century the word people meant plebs It meant the scum of the earth essentially and you still see this kind of attitude Among say the Ken Browns and the Richard Spencers that the people that they're just plebs that They're just stupid stupid masses Who need to be bossed around and told what to do by an elite but in England in the 16th century they developed the sense of nation Right and people change meaning so it used to be that a nation was governed by its elites And only the elites really had dignity only the elites really had choice only the elites could Determine national direction, but in 16th century England you had the rise of the sense of nation So people weren't just members of orders. They also for the first time felt themselves part of the English nation And so the English took tremendous pride in their nation and They began exploring they became the most powerful nation on earth And they got filled with a competitive fire and along with this growing national sense of consciousness So Leah Greenfield defines nationalism as a sense of consciousness the year that you're aware of your nation and then when you're aware of your nation you can't help Caring about your nation and taking pride in your nation's accomplishments. So England got fired up By a sense of its nation became competitive with other nations So exploring and dominating the globe becoming more and more fired up or more competitive more and more accomplished at the same time And then this had spillover effects so that the French in the 18th century They looked at what was going on with England and said hey We want some of that and so nationalism as a term was first used by the French in the 18th century So nationalism began in the 16th century it didn't become though a term to the 18th century But you got the term nation that began to be used in the 16th century and the term people began Changing meaning from people meaning just the plebs to people meaning all members of the nation and therefore Possessing dignity and once you get that taste of dignity What comes with it is a sense of freedom and a certain measure of equality And so this swept through England and then the English took this with them where if they went in the world It rubbed off on the French and so you would not have had a French Revolution without this growing sense of peoplehood and of nation Now the English and the French and the Spanish Develop this nationalism and they had plenty to be proud of from their history but when it gets to nations without accomplishment such as Russia and Germany then people say well, we're proud of things that you can't see We're proud of our race what's going on in our blood and that's where you get the rise of collectivist ethnic blood and soil nationalism and Then when the people of Europe dominated the globe they brought with them the sense of nationalism Which then rubbed off on the Arab world so the Arab world was ruled for Thousands of years by by the Turks they were not Arabs and no sense of nationalism developed But in the 20th century there was this growing pan-Arab sense of nationalism because it was inherited from their colonialist overseers the the English and the French in particular and so It was the English and the French who carved off these different nation states in in the Arab world such as Syria and Iraq and Because though those identities don't really have a lot of historical resonance the earliest Arab nationalists developed pan-Arab nationalism and and the Indians the Indians were ruled for For a long time by Muslims and they never developed a sense of national identity But when they were ruled by the English, right? They they inherited their sense of of growing nationalism from the English it got transmitted from the English to the Indians and so the first time Indians said hey We're a people We're a nation we deserve to be sovereign free and dignified and So wherever the English and the French went in particular their sense of nationalism rubbed off on their colonies Women at mr. Ford Shover's table are always enthralled by lavy's pontifications So I was listening to Tucker Carlson last night He made made some interesting points that I don't think I've seen so clearly made the point that the Democrats in Their push for gun control. It's it's really Republicans guns that they want to take away because Democrats when they run big cities they're not Intent on punishing their voters who are court-possessing guns So Democrats at the same time they are pushing to decrease the number of people who get incarcerated They are choosing overwhelmingly in places like Los Angeles and San Francisco and Philadelphia where you've got these radical left-wing District attorneys so in Los Angeles it's gas gone They're buying large dismissing gun charges against Democratic voters Because they don't want to send more Democrats to prison So they want to take rifles away from Republicans That's their their push at the same time They want to not prosecute gun crimes by their voters So I thought that was that was an interesting perspective that I'm not sure I'd seen so clearly before Then had Ben Carson on talking about the racial wealth gap in America that apparently White and Asian homes have said ten times the wealth of black homes and Ben Carson knows that noted that Ghanaian Nigerian immigrants to America have about the same wealth per household as as whites and so I would think that the Immigration from from Africa to the United States the only people who could Who could successfully pull off something like that would be people with way above average IQs and way way above average determination and personality personalities that are more effective certain personalities are more effective personalities that are agreeable conscientious outgoing low in neuroticism and high in openness that those are personalities that make for more success in the world So if you combine that with an above-average IQ should be doing pretty well in life Bye-bye


Hey, we're still in New York and I've got Jill Duffy and Dan Patterson here. Hi everybody. Who are you guys in? Oh my I didn't see you there. Thanks for coming. Thanks for having us.  Now apologies for making you stand But I think this is gonna work better that way. Make sure to speak into the mic Dan I know you I know you're as an audio professional. You've never you've never dealt with that before but All right, I think I'm ready you guys are ready Here we go.  That's patreon.com slash aced Tct This is the Daily Tech news for Tuesday October 14th 2014 on Tom Merritt and joining me today Jill Duffy from PCMag.com. Thank you for coming and Dan Patterson tech journalist and sometimes bearer fighter in my imagination Good to have you back. It's a you've got a new show out the signal podcast Yeah, yeah We'll have a lot to say about that but let's start off with the headlines No, seriously Tech crunch noted that Dropbox confirmed 400 account credentials posted to Pay Spin were in fact for Dropbox accounts security chief Anton Mejia again drop said Dropbox was not hacked These were users who had the same password at Dropbox as other services Most of the credentials had already been caught and deactivated and the rest have now been reset So none of them were used on Dropbox for any malicious purpose according to them several hundred more credentials were posted later But Dropbox says yeah, those were not real those are not associated with Dropbox accounts We're gonna talk about this in our main topic The next web reports the Google's same-day delivery service is no longer free also got a name change Google shopping Express is now just Google Express and brings groceries and other purchases from various stores to your door at a Convenient time service now costs five bucks per order more if you want alcohol though You can subscribe for $95 a year or $10 a month and not only get all your orders without extra charge But get first dibs on delivery windows memberships can be shared with people in your house Google also added new retailers including Barnes and Noble and nine West's shoes Which is important to me and expanded from San Francisco LA and New York to include Chicago Boston and Washington, DC Have you guys ever use this out here? I've tried to use it once and then my Google wallet failed Yeah, not yet. Yeah, that one's not for me. Yeah, okay. Well, that's why they're doing this They're like no seriously pay pay money and try it. No, they had it for free to get people to try it But I just didn't work for me that do you see this as an Amazon Prime competitor because Amazon Prime has so much more Going on I think it's trying to be yeah I don't think it'll get there particularly the comments that Google has made lately about Amazon being their primary search competitor I think that they're making little intonations Directed at Amazon and this could be one of those PC Mag reports August smart locks will be coming to Apple store shelves this week for $249.99 the smart lock works in single-cylinder dead bolts and Create virtual keys on smartphones keys can be given to friends through the app and even revoked when necessary It also works with physical keys as well. This would be great I mean this kind of thing is not the first one But this is gonna put this sort of technology in more people's hands and it's great for when you have friends staying or someone watching your house or whatever Yeah, you can just give them you make sure they have an app and then the people watching your dogs or your cats don't have a phone With the outright Yeah, right Skype has a new mobile messaging service called quick Yeah, remember they bought quick and then they ignored quick then they shut down quick Well now the name is back users can share video clips up to 42 seconds They disappear after two weeks or the sender can delete them at any time. There's also quick flicks Put your five second clips available on the Android and iPhone apps coming to Windows phones soon Blocking other users is available for Android and Windows phone, but not the iPhone I can't block anybody on iPhone and now that I made damn my friend. I start with We were trying this earlier. It was it worked. Okay. The problem is always or the challenge at least is neat Do we need this and you know there are maybe some use cases, but it's questionable. Yeah, I I Like I said in in our little quick exchange I thought camera phones and instant messenger were stupid when they first arrived as well So I could be wrong about this, but I'm not sure We need it they have an interesting interface that allows you to see the conversation and play it back I found that interesting later. Yeah And you know Jill you and I use the the Apple messenger phone to share audio messages about the show, right? Hey got an idea. Here's a quick message. Although the video is almost usually I look terrible or I'm walking down the street You're like you don't need to see me. Yeah, and the market's already so saturated So if there isn't a unique hook on this, why would anybody adopt it now? I think you're right Washington Post reports that the FCC is considering area's request to be classified as a multi-channel video provider Just like a cable or satellite company subject to all the rules and regulations of cable and satellite companies now That means something good for area in this case They could start negotiating with broadcast networks for retransmission fees that may sound like a bad thing But right now no internet video providers are classified as MPVD's and so they're basically ignored the networks will say no We're not even going to negotiate with you So if area were to get classified as an MPVD it would have to pay more for content But the networks would have to let them pay that more for content PC Mag reports eyesight partners announced a zero-day windows vulnerability today It says Russian attackers are using it against US European and Ukrainian government agencies NATO Telecom companies an unnamed US academic organization the attacks are attributed to a group nicknamed Sandworm team because of their frequent references to the Dune series Security experts have been tracking the five-year-old group referred to as Quedeck by f secure since late 2013 I don't want to say I like a team, but I do like Dune like it's kind of interesting clever. Yeah Aren't they always though Android police report on a leaked Google ad Featuring little Android characters with the slogan be together not the same It includes an animated version of the Nexus 6 running Android L The video comes with a link to a page on the Android site that isn't yet live But it could be if the Nexus 6 is announced which Forbes speculates may be happening as early as tomorrow Maybe do you think they would do that the day before an Apple announcement? Yes, yeah, well, I don't know I should I need to recuse from Gotcha Time now for some news from you. These are submitted on our subreddit daily Tell me show dot reddit.com if you haven't jumped in there go take a look There's like 3,000 people in there submitting stories voting them up or down We're getting a good amount of votes on these stories now So we can really start to tell which ones you really like and which ones you like less Alan AV submitted the tech dirt story about a comment on the US FCC's open internet guidelines filed by VPN company golden frog Company describes evidence that a wireless broadband provider. They're not named actively blocked S T are TT LS encryption start TTLS encryption preventing a user from encrypting SMTP email traffic Golden frog described the provider is modifying messages in transit in one case from 250 start TLS to 250 xxxxxxx a Causing encryption not to be started There but other Complaints and in fact golden frog had some complaints about Netflix Performing better in a VPN than others, but there there are some very non controversial reasons for that what happening I can't think and maybe I'm missing it of a non controversial reason why a wireless provider would be killing encryption Over their network. Can you guys? No, but it's yeah, it's hard to make assumptions You know I mean you're overriding a request in transit That's a man that definition of a man in the middle attack if if this is true, right like we only have golden frogs worded for it Yeah assumptions are hard TM204 passed along the science daily report that researchers at Nanyang Technological University have developed a battery that can be recharged to 70% capacity in two minutes and have a more than 20 year Lifespan and to use Singapore scientists replaced the graphite used for the anode That's the negative pull in lithium ion batteries with a new gel made from titanium dioxide That's the same stuff in in some of your sunscreen the nanostructure of titanium dioxide helps speed up chemical reactions Get very excited about battery stories, and they never pay off Well, I think they do but maybe not directly that not immediately Yeah, this is great stuff though. Yeah, no, I One day this will all pay off. You're absolutely right Alan AV posted the wired story about the launch of Kickstarter funding for a Nanna box the $45 open-source router directs all data through tour Hiding the user's IP address. Apparently the box is tiny enough for two to fit in a pack of cigarettes And so it's not the first tour in a box But the hope is that it strikes the best balance between cost 45 bucks setup supposed to be plug-and-play size obviously and security project is open source but has not been audited yet for security I love this idea. Just plug it in on the side on your ethernet doesn't matter where you go You're on tour Routers are tough. Yeah, you're skeptical. Yeah, and it's in Kickstarter face still. I need to see something working. Yes. Yeah Nobody's tested it yet. Yeah, and I think I mean anything that makes this type of encryption easier It's also going to add more and more flags, and it's very easy to see Okay, these are the encrypted networks that were the encrypted traffic, and it's very easy to spot that And single it out finally Bishma submitted the TechCrunch story that Dorian Nakamoto is suing Newsweek for writing the article claiming He was the creator of Bitcoin Nakamoto denied creating the cryptocurrency says he was targeted and victimized by a reckless news organization Nakamoto created a web page asking for donations to his legal case And yes in case you're wondering you can donate by check money order credit card and Bitcoin Which I mean why wouldn't he obviously can have a lot of people who have bitcoins Want to help him out and that's a look at the headlines All right, let's talk a little bit more about this Dropbox story 400 Dropbox credentials there've been more posted but apparently Dropbox says they weren't real But they do say these first 400 were real Dropbox says the usernames and passwords referenced in these articles were stolen from unrelated services not Dropbox Attackers then used these stolen credentials to try to log into sites across the internet including Dropbox So they're essentially trying to calm the Dropbox got hacked fears and say no we never got hacked This was you know people out there hacking Home Depot and Target like crazy And then they're trying out all of the credentials that they find and if they work then they collated all together Now Natasha Lomas over at TechCrunch says great. That's you know, that's a fair point, but Dropbox could force everybody to do two-factor authentication Do we think they should I don't think no not their responsibility So the first thing I think when Dropbox said we didn't get hacked Technically that is true, and I would say they didn't play the blame game They didn't say you users are to blame for reusing these passwords, right? I think kind of is the case I think on some level you have to be smart you have to be savvy you have to use a password manager That is like a drum that I will be until the day I die until the day we fix passwords Yeah, right passwords are fundamentally broken. They're not a good way of protecting your data You can go at Dropbox for a couple of different angles because they certainly don't do everything they possibly could to keep your data safe encrypted And secure, but I don't think I mean if you were asking Dropbox to mandate to factor authentication You'd have to do that with every site and users would hate it And then they wouldn't want to use those sites who that mandate that Well, I think I think mandating to factor authentication is one potential solution here But it kind of bypasses the responsibility argument and that is to what degree do we hold companies like Dropbox responsible? Not just for implementing things like two-factor that is one solution But they also have a responsibility to educate their customer and to encourage best practices, right? So it's it's all well and good for us who are geek to know about to like password managers and such And I don't think that that invalidates the ignorance of of A person right it's not my fault if I'm a layperson and I just use Dropbox I didn't know about two-factor. I didn't know about real great password security Maybe I should but at the end of the day I'm using a service that hasn't encouraged me to use any safer practices If you remember the early days of Twitter who'd often put little Flags that would say never log into an account that is not Twitter calm never use your Twitter username and password Which is a responsible solution for this as opposed to a binary it must be two-factor or nothing It seems like there is a responsibility on the part of all sites to encourage best practices Yeah, let's say Dropbox and Dropbox does some things like that But let's say they they go whole hog and they do everything you want and people say Oh, but you're not making me two-factor authentication sounds hard in a pain Which I know people who use Google and Twitter say yeah, I didn't do that. It was too much of a pain the purpose then what is not necessarily to make the customer safer it is to Deflect not deflect that sounds They start to sound spin. Yeah. Look we did everything we could up to the line of forcing you to do this Like we can't responsibly do anything more than inform you. This is what we did to inform you Now look at snapchat you brought this up earlier today when we were talking over email snapchats API is Apparently very easy to be reverse engineered a third-party app was doing that getting people to use it snapchat says We very much encourage people not to use these third-party apps because they're insecure and Some response from developers is yeah, well if you had an open API you could control tokens for third-party apps You'd be able to revoke unscrupulous apps. You wouldn't have to rely on the app stores to police this Maybe the API should still be less easy to reverse engineer But but you know it would be much better and snapchat in their blog post today said it takes time and a lot of resources To build an open and trustworthy third-party application ecosystem. Don't get us wrong We're excited by the interest in developing for the snapchat platform But we're gonna take our time to get it right This is another example of that same line of them saying well the responsibilities on you not to use the third-party apps This is good communication. Yeah, I mean this is much better snapchat has learned from that last mistake They had where their communication was very poor It was pretty much like screw you if you got your number stolen. This is much better and more responsible communication It's explaining what this is why it's hard to do like you can't expect you know run to be built in a day This is what we're doing to work on it, but shouldn't they have an open API by now. Yeah, sure They're valued at 10 billion bucks. Of course they should What do you think Joe? Well the one thing that is nagging me about both of these conversations is the content that might potentially be hacked or compromised right, so in the case of Snapchat, okay since the day that this app came out.  Everything is vulnerable to some kind of attack Everything can be reproduced if it's digital, so that's the first thing right like is what are we actually talking about? Potentially being compromised in the case of Dropbox. I think again. It's the responsibility of people to be Careful like you shouldn't put a copy of your passport in Dropbox probably The thing that I'm thinking about though is businesses Dropbox has made a big big Piece of its own business out of offering business plans, so that data is sensitive It is critical. I have a feeling that none of those Passwords or username password combinations would have been posted. I don't know, but I have a hunch that it's probably all personal user accounts if especially if they're coming from somewhere else, but I That's the part that sort of troubles me that the tech community may be not be talking about as much as what is the content That's really at risk here. Yeah, and Dropbox to be able to be successful needs to assure people if you put your passport photo here It will be safe and and they say that and we can get into the whole other side of it Where Edward Snowden points out? Yeah, but they hold the encryption keys if the government comes they can get your stuff But barring Dropbox handing over encryption keys Dropbox is secureable, right? But it comes back to the same thing we keep talking about which is you have to take Responsibility for that you have to turn on two-factor authentication or set up a text messaging or make sure you've got a Password manager, so you're not using the same passwords at multiple sites like all the best practices of password management That's too hard for most people and then Dan you you talked about that earlier Like most people just don't want to have to deal with that Well, and this could be this these could be signals flags of the new era less naive era of the web, right? So we had the first bubble which was the expansion of the web We we had the rise of social media and web 2.0 which was a very you know, we were super into very excited to build these things to making it as as Convenience as possible and Jill you said earlier in the pre-show that we're you know It's just easier, you know two-factor creates a barrier This may be the time where we now if you're using the web you just have to be more Sophisticated we are less naive than we were 10 years ago And we just have to you either take on good responsibility or suffer the consequences and it may be enough friends getting burned that In five years were a more sophisticated society when it comes to using passwords in the web I'm really excited for passwords to just disappear There's a whole bunch of wonderful security companies who are working on alternatives to passwords I'm one of the ones that I've seen recently is the mini bracelet. It uses biomarkers So in this case your heart signature, but there's lots of things like the retina scanning even the fingerprint on the iPhone And the iPhone 6 and 6 plus will have it for your credit card use I mean that's another case where we just do things in the most backward way Considering the technology that we have at our disposal today the way that we use credit cards Especially in the US where we don't even have chip and tin options for the most part It's it's a broken system and it's it's easy to hack. It's easy to steal It's easy to use these these pieces of data to your own profit, which is what hackers do They're always trying to make money off of their hacking So I'm excited to see some innovations in in getting rid of passwords altogether with other kinds of keys and methods of Unlocking our online identities. Yeah, there's you know the problem with the heart rate Monitor that I read about was people saying yeah, but you can't change your password then your heart sir heart, right? so it has to always be paired up with another factor and and a lot of times like touch ID is backed by a password so if you can hack The password you can still crack into somebody's phone.  Yeah, I'll be for a better password. That feels like a really pessimistic I mean Really comes down to any time we say this over and over but anytime you put something on the web With another entity anytime something is stored with another entity if it if it's it can't be protect It simply can't be protected the web never forgets, right exactly, but it's always a trade-off, right? I mean for the same argument that we say You know people complain about Facebook owning their data if you're not paying for it You're the product what is the trade-off though is the trade-off that you get to use Dropbox all your files sink effortlessly You're happy because your photos are backed up Automatically and the trade-off is that your data isn't secure and that you have to take these extra measures to make it more secure I think Dropbox would say it is secure like they didn't get hacked, but you have to take that responsibility Yeah, the trade is you have to do some work. Yeah. Yeah at this point although I pay for Dropbox I Pay them come on. I just and I have they have two-factor authentic Yeah, actually I use spider oak as well. Yeah Dropbox for things that I don't care if the government Yeah, yeah, exactly totally legitimately acquired comic books Well, thank you guys. That was a good conversation. Appreciate that. Let's take a look at the calendar real quick tomorrow October 15th earnings released for eBay and Netflix will keep an eye on those our pick of the day comes from Ken Shabby Splashtop he says on Monday show you discussed attaching PCs to televisions and the problems controlling them with wireless mice and keyboards my pick Splashtop a free remote desktop app that makes controlling your computer with your mobile device easy Splashtop consists of an app you install on your tablet and a streamer program you install on your Mac or PC So it's it's essentially you're just tunneling into your PC You can control your old XP PC using new touch gestures on your tablet No more trying to use a mouse while in a lazy boy. No more having the giant wireless keyboard Flashing around your living room if your mobile device doesn't run flash You can still view flash web pages by running them on your PC and streaming them to your mobile device is nifty It's a VNC essentially is what it is Splashtop allows you to mute the sound on the PC Listen by your mobile device that way you can plug in the headphones watch without anyone knowing else other people in the room Works like the Roku 3 remote with the headphone jack Not sure how well it would work on a phone unless you have really small fingers or a really big phone like the note It might be hard to control your computer on a smaller screen works fine on my Nexus 7 He says I know a friend who uses Splashtop or was using Splashtop to play Hearthstone before Hearthstone came to iPad So it's really good for gaming on your tablet when your game is not available for the tablet Yeah, I know a lot of people out there like yeah, it's VNC. I get it But Splashtop is a really good one and so it's really popular. So thanks for the pick not too shabby Ken shabby Send your picks to feedback at daily tech news show comm you can find my picks at daily tech news show comm slash pics Do you guys attach a PC? What how do you watch internet video? Do you have anything connected? I? Have right now. I have an Apple TV on my TV the TV is a smart TV But it's not that smart so we need the Apple TV for things that I can't do and then I watch You know what? I'm really bad. I listen to TV and Netflix especially while I'm at work So I just do not do a monitor. Yeah on the laptop let it go I don't watch so much on mobile devices though. Yeah me either actually maybe on an airplane right on a tablet on an airplane Dan yeah, I'm Roku Apple TV and Chromecast and I toggle between them Right very similar actually I'll put something on the background and then not an audio person. I'll listen to television, but All three interesting yesterday's show we were talking about the article in the verge about you should hook a PC up to your TV It's the best thing possible and I as an I kick that around we got lots of great emails About your PCs in your living rooms John and Dawsonville said I use a desktop That's a bit outdated but still has HDMI out hooked up to the TV use my laptop with Chrome browsers remote desktop web app Kind of like splash shop gives me a keyboard and mouse right my easy viewing of what I'm doing once I choose what I'm going to watch I close the laptop and enjoy it on the TV Dwayne at Romstein Airbase in Germany got a Surface Pro 3 So he put his Surface Pro 1 Connected to the TV. He writes it has never moved since being put there It's the ultimate streaming box about the Bluetooth adapter for the touchpad keyboard so I could type from the couch The perfect media PC was born I Want to know if he's using Plex or media center or what he put on there, but that's interesting Yeah We did have a few emails from folks that have tried PC in the living room and moved on Otto wrote in and said I have a Roku and Or fire TV connected to the other TVs in my house I guess he has Roku and one and fire on the other because I want mere mortals to have a chance of being able to TV but for the home theater in my basement I built a home theater PC because I wanted the best experience for media and gaming with usability being a Secondary factor as it turns out. I can't wait to find a solution that allows me to replace the PC Here's a few of his issues the range of wireless keyboards and mouse about 10 feet He runs out of room. He had to run a USB adapter over cat 5 to work around that Steam is a good interface for games Plex is great for media and Netflix only streams in its highest quality though If you use the Windows 8 modern UI app, so he has to bounce in or out of all of these interfaces Of course keeping everything updates software updates are always a pain He does recommend chocolatey new get to help with those updates and PC power management wasn't really built with set top boxes in Mind he says the list continues. None of these is insurmountable I'm sure there are work around so that I covered nonetheless I keep hoping that steams in home streaming improves and Plex's audio problems on fire TV get resolved And then Mike tease Let's see if I can get to Mike tease jester in the tadpool chat realm rights Just wanted to drop a note about the living room PC article. You talked about I just removed my living room PC Five months ago after using one since 2009 the PC in the living room took up a good deal of space It was noisy keyboard and mouse wasn't all that useful from across the room for the majority of uses in a windows Environment at 1080p what we found to be easier was a Chromecast Working extensor with our iPhone and iPads at first we lived on just Netflix and HBO go But a month ago I installed Plex it's a recurring theme here on my home office desktop and set up the Plex app on our touch screen Devices to control it everything is now just a few taps away while not perfect It's getting better every few weeks the biggest issue My wife has is being able to quickly pause something because when the iPad goes to sleep Then you wake it up the majority of apps have a hard time reconnecting quickly to allow you to pause what's playing Have you ever run into that where you're like no no stop play? Please reconnect PCs are nice, but as with all the current solutions none of them are perfect for everyone. Thanks everybody for writing in it's good stuff and Thank you guys for making the trip But no for you know getting getting out of the the office and coming over here is really fun Jill Duffy you can find her work at PC mag calm anything in particular to let folks know about Oh, I have a weekly column called get organized So this is about simple solutions for cleaning up your very messy digital life Yeah, if you're a digital hoarder you need to read this and the signal podcast calm. Yeah, right, so This is both of us right Jill and I have been working on this for a month or so I've probably been kicking around the idea for a couple months and We just as in like this weekend got the website up. It's the signal podcast calm and the show is not yet Composed but we're taking our time with that and making it something that's Sounds pretentious, but craft it. I mean it's professional, but it's not like of the professional soul It's of the like creative soul Yeah This is just a fun project for us where we get to talk about some of the things that we hold near and dear to our hearts and some Things that are going around on around in New York City, which are sometimes a little under reported I think for the rest of the world, especially in the tech world Yeah, check it out the signal podcast.com is a beautiful website. You guys did a great job on that Can't believe the podcast isn't going to be like And Dan Patterson comm I'm writing for right. It's a little outside. I think as my career has progressed it's moved a little outside of tech So I'm writing about business for the Washington Post I'm writing for a docker some short form business right articles and then contently about You know the 5,000 word piece on church and state in the media here in New York So I'll talk to a lot of people like I think David Carr is on record for this. I'm like, you know, some of our favorites a Some media town we talk about ourselves. So I'm gonna write a long piece about ourselves Check it out. I keep keeping keep track at Dan Patterson comm and your Dan Patterson on Twitter Twitter Don't forget the e Thanks everybody for your support on patreon We are like less than $800 away from reaching the next level which allows to bring Justin Robert Young on as a regular contributor 4409 folks that are patrons innumerable folks supporting the show in other ways whether it's Bitcoin or PayPal or just telling folks about the show Go to daily tech news show comm slash donate to find out more about that Don't forget you can have a voice in what stories we cover at our subreddit daily tech news show reddit comm Our email feedback at daily tech news show comm. We have a voicemail to 512 59 daily That's 512 59 3 2 4 5 9 and you can listen to the show live at mobile dot alpha geek radio comm And our website is daily tech news show comm. We'll be back tomorrow with Andrews Arian He's gonna actually leave Queens and come over here. See you there Yeah, that was really good. Thank you guys. Thank you. The only thing I feel bad about is making you stand through it You could have a seat If you would I'm gonna I'm gonna sit down myself But I usually leave the stream up while I post the show right away. So make yourselves at home Jenny you'll still be around we got to pick the show title Jenny you got and I'll forget radio. You'll just won't be able to hear her but everybody else So at show bot that reflex org if you guys want to follow along. Oh, this is great. Look at this So big Jim has pass holes comma. We're surrounded by pass holes That's four votes number three is Google Express from with dollar signs forming the s's from Todd Whitehead Big Jim again with a Rio again this time or cable News where this ever cable. Yeah news week from beat master. Of course spelled w e a k And my personal favorite from T2 T2 with which is it's mature on a box that one Got a hole in the box Fire up your tour browser. Yeah Well his step two was stick your stick your ethernet cable in the box Well, yeah, actually is legitimately this legitimately the second step And then another one from bio couch. I liked was TLDR don't reuse passwords Which is pretty much. Yeah, that's that is at least as far as like your takeaway of what you can do now That's definitely the TLDR and I'm let me look. I'll look through the deep cuts here I don't know. It's my torna box got the the most reaction from yeah I mean come on when you when you have a chance to make a Let's see drop box docks Dropped Yeah, those top ones are my favorite Is it going to be torn a box? I Mean come on. It's gonna be torn the box Not only is that at the best title. It's also like a Cool idea that deserves a little more title space Like the tour thing. Yeah, if you really make that work like make it super easy to be anonymous that would make me happy Yeah, me too, I wanted to get audited and people go. Wow, it's pretty good Can't find the start of the show today Hmm Yep, there it is I Didn't give myself enough There we go Who else Jill and Dan tell me the name of your site again? It's in the dock Thank you No, thank you 2014 1014 that's today, right Thank you, you get to see a lot more of the room now Dream is a nice website It is isn't it? It's gorgeous that oh stop. He's so modest. It has a mixtape on it Fantastic, this is a really nice. It's just a wordpress No, no, it's a ghost Mostly it's derived from wordpress, but it's like all markdown and php Wow This is nice. I'm exporting the mp3. So Passholes were surrounded by pass. I do like the idea of the pass hole.  Hmm. I think it's the people who make us use passwords. Yeah, okay Worked and actually recorded and everything much better than yesterday I Let them know we can still hear them on the podcast Yeah, that's all they know all right, you know, they can still hear you, right? Okay. They know Like This is a preview of the signal podcast Absolutely Yeah, she probably should She's a Native New Yorker. I Actually never had an accent so I shouldn't even pretend to try Was raised on the Upper West side of my as well have been raised in like, you know 89th and Central Park West Oh man classic That's that's like right where it meets Broadway, right? Right there and and where it meets my home turf of Grace Papaya Many a late night Substantially intoxicated good time was had there How long did you live here, Jenny? the first 26 years of my life give or take some forced time in New Jersey and some college in DC, but like it was my It was pretty actually close to 28. I forget I came out here in 2002 Yeah, so I'm in it. I moved for love And that's the only thing that I've gotten me to leave New York She's Hollywood now Oh Terrible no straight-up Hollywood like I can see this like I can't see the sign, but I can see the sign from a walkable distance from my house I'm in the flats That's awesome I Can see across the street Oh From here. Yeah, this is this place it is If you go if you're in the kitchen you can see though the one world center Freedom tower I see that's why I keep fumbling around what what do you what do you call it? That's why I use both because you you guys are both like In both It's a tiled interface Okay, I'm out of the post Jenny About to go in the post I'm defending my right to have once lived in a red control department on the upper Block west All right I'm gonna end the stream goodbye video One last goodbye here. You can't see Dan Goodbye. Goodbye


All right, so we're okay you don't need to look at any of that Couple of you sent me answers. I think most of you are right. So if you haven't done that get that in all right We've let's see. Let's summarize a little bit. We've got two sets of Normal stresses That we've come across so far one is just the That normal stress we started class with which is just simply If there's some kind of axial force of some kind then that'll cause an internal force in the material acting over a cross-sectional area Which will just be a particular Particular just just an axial load of some kind that causes it. So I guess we can call that axial stresses Then we had the stresses due to bending Which we knew to be linear through across the cross-section With a point of zero stress being at the neutral axis which we also now know goes through the area centroid So we had those bending stresses then we've also looked at some Some shear stresses those came in in two flavors for us one was the Shear stress due to the torsion remember that the twisting of These pieces or these shafts or whatever transmission shafts was the most likely place that we've seen this sort of thing Where that was also a linear function of position across the piece and then we just finished with With the transverse shear stresses these things last week with that so that's that's kind of a quick summary of the things We've we've had so far Now If you if you notice in any of these type of problems we've been doing we only had one of those stresses for the other We only had Axial loading at one time, but we didn't have axial loading and bending going on at the same time a very good example of when that type of thing could happen and we'll look at it very closely later in the term Is if we have a column a long slender column that's loaded that's going to have Clearly an axial load of some kind So we'll see those type of axial stresses We saw in the first very first week of the course But if it's long and slender enough it will also tend to Bend like that and so there's going to be both axial loading and bending Stresses in the in the piece at once So we're going to look at problems like that combined loadings. They're they're relatively straightforward to deal with in that they For small deformations at least they tend to just add together So imagine we have against some simply supported beam of some kind Loaded in a very simply way Simple way some kind of axial loading like this now DJ up you thought or me It could be that there's something about the structure that means it's loaded that way or it could be that Sometimes pieces are put into a structure and they're loaded As they're put in before the structure is even completed sort of pre-stressed And then let's imagine we also have some kind of transverse load We'll put it there and In millimeters We'll position it Right there So this is a very simple type of loading. We've seen these type of loadings before but we've never seen them together The solution of this is is relatively easy in that we can break these two apart Look at just that loading And the stresses it causes we know that if we Look at the type of stress that's caused in that there'll be a uniform Normal stress all the way across the piece just a very type of stuff We looked at it in the first week then we can also add to it what we know about the bending stress Which we looked at in no, I don't know probably the second month of things. I guess we were looking at things what these These loads are there and then at some point we could figure out what the maximum Moment is and we'll just take this cross-section to be a simple Rectangle make things a little bit simpler for now call it 50 by 75 Millimeters we know that that bending stress is linear Being zero through the neutral axis We have compression on the top for the type of Bending or what type of loading that we've shown there So that the maximum bending stress wherever the maximum moment is at the farthest Away from the neutral axis piece of that beam over the Moment of inertia the cross-section nice simple right thing with their cross-section Not too big a deal to look at I hope and Then we Without too big a stretch can imagine then that the true loading now is the combination of the two of those Neutral axis is there. So we've got this this oops. Hang on here. Sorry about that drew these arrows going the wrong way Because for the bending we've got we've got an axial loading that puts everything in tension and then a Bending that puts the top in compression and the bottom in tension So we want the arrows going the same way as the tension for that So sorry about that so this This a little bit of the compression will take up some of the Tension on the top all the way through and then we get a cross-section that might look Or I mean a loading that might look something like this depending upon how much of The compression along the top is worth the Tension that's caused by the axial load Well, we can figure out all of those So it's not too too big a deal. I hope we've been going over a lot of this stuff for for some time for example that normal axial stress we know to be What the 25 kilo Newtons? Acting over that simple rectangular cross-section and so we can figure out what that stress is it's a simply Megapascals Right, that's that's the long been in our playbook that one there We're happy to see that. That's like a zero friend So the this one it's a just a little bit more time We need to figure out what the what the maximum moment is, but your experience. I think should show you that The maximum moment is going to occur right here We've seen that type of thing before You could you could probably quickly come up with that. I bet So we can just put it in here that's going to be 2.7 kilo Newtons at the 375 millimeter point That's where we're going to see the maximum moment the moment will decrease to zero from there C is the greatest dipton from the neutral axis which is half of this 75 It's only five millimeters over To the eye for a rectangular cross-section at 1 12 the base which is 50 You can figure out that remember it's symmetric. So that'll give us the Compression on the top and the tension on the bottom and we can be a little more specific with these cross-sections now So somebody work that out for me. So we've got it these together In a little bit of a scale drawing just to make sure stuff fits see what we end up with So I'm just re-sketching the separate loads here We know that to be 6.67 separately now And they got it so we're in something like 21 point seven megapascals We know that to be linear Zero at the neutral axis. So that's 21 point seven compression at the top So about three times bigger than what I've got there along the bottom. So I have tension going to the right compression going to the left and it's the two of those together that allow us now to Draw our our full profile So the top will be in Compression because we have more compression from the bending than we have tension from the axial load and that's That's what? Oh, I don't have that one What's twenty one seven minus six point seven? Never mind 15 Right, so we've got 15 in compression and the bottom will be the twenty one seven of Detention from the bending and the six point seven the tension from the top which is What twenty eight four, but you see that the profile is all shifted. What was this this was 15? I think 15 megapascals in compression on the top What was it 24? 23 tension on the bottom the max the simple superposition arithmetic loading Arithmetic addition of the two loads who types of loads we had Yeah The old neutral axis was right down the center now there's It's not a Geometric neutral axis, but there is a new place where the stresses are zero. It's been shifted because of the combination of the two loads You could look at it as this tension relieved a little bit of this compression But did add a little bit to the tension below Depending on what the materials are it may or may not make things substantially worse if this was a concrete a Concrete beam Then we served to increase the tension along the bottom where concrete stores Does it is anyway? So this might be one of those cases where you want to consider Rebar across the bottom to hold some of that tension All right, so let's do one together to have some kind of bracket thing here Attached to the wall turned about two points One point right in the middle there one point right down here at the bottom. Maybe we're going to Consider drilling some holes there for some reason we want to double-check what the What the Stresses are there There's two inches from the center of the far side of the bracket And a quarter inch down from the upper part we have a load That is slow everybody know what that means we say there's a three four five so what that is that gives us the You automatically have the tree components that This hypotenuse is some multiple of five which it nicely is that the other components are some multiple of three and some Multiple four by the same scale All right, so what was the rest we need here? Oh the cross section right here rectangular The shear stresses we can find in again the same way by adding them together All right, okay with the picture lacks this will be symmetrically Expose those Two points we can do a free body diagram. That's where we want to know the stresses 50 at three four five so we've got some axial load on this and some bending load and Some shear all caused by this load over here We know Components are two hundred by three fifths by one fifty Internally back here. We must have a An axial load by inspection. It should be pretty easy to tell what that is That's got to be equal to the two hundred Horizontal component there we have Load down so we must have a shear up Again fairly obviously it should be equal to the 150 and Then there's also though a Moment I well we got the two hundred and One and a quarter moment arm and 150 at a two inch moment arm So take a second to figure out what that moment is just to warm you up here Make sure we all get the same thing Because each of those is going to contribute something to these stresses So we need to figure out all those those pieces and then just add them together Check your numbers with each other for the moment. Did I drop then how much these two? Moments are opposite each other Axial load will be the two hundred and figure out what the stress is The normal stress is at point a it will be some tension caused by the Axial load there that P Plus a little bit of tension We know by observation it will be tension because of that moment at Whatever location With respect to the neutral axis that point a happens to be Which is who wants to do this one in our head and take the rest of the day off? Tempting, huh? It's almost like get out of class except you can't leave you have to stay here. It's what? Well, that's what I is What is this? Why zero point a is on the neutral axis? So why is zero remember that's the distance of the point of concern in this case? We have points pre-selected for us so That one's zero and so the P over a is straightforward, what is it? 0.5 Ksi that is tension we can see that from inspection, right? We do the same thing at point B. It's got the same normal Tensile normal stress there But because of the moment being applied we know that's a compression, so we'll give that a minus sign That's typically what we do for compression now. We know what the moment is Y is Pretty easy to pick up from there So we do have to calculate I but it's a rectangular cross-section 112 the base times the height Now do that separately because we are going to need that remember for the shear stress the vq over it So figure out I separately for the cross-section All right figure out what I is keep it separate because we're gonna need it again later anyway and Then figure out what the normal stresses are point B Active with each other Make sure we all have the same eye Hope we do it's just right there Got something for the stress the DJ is not doing either. He's looking for somebody to talk to DJs over here This is the deal Spurn it check with him. He didn't have any units I mean nice There's a There are a couple of Calculational packages math cat where you actually can put the units in it'll check before it's really nice We don't have Yeah, well good We'll talk to a Malcolm about amazing deltas all right what we get there in this case These two are not acting together right the one part here is in Tension this parts of compression we need to know which is dominant. It's what Compression now that would have come through you should have had a minus 1.07. All right, then the the shear stress is Also made up two parts. We have the we have the Oh, sorry just one part because we don't have any origin in here B where this is Q Hey, so we've got already got B. We've already got I nicely T is just from the cross-section 0.75 So we just need to remember what those are we've got At the center and be at the bottom of that cross-section So Q a is y bar a of what area the point of concern away from the neutral axis to the rest of the beam so and we call that that script a so that is the area for which we do y bar a It's times then the area which is the half area of the beam should get something like oh Just by that something. That's the the location of the centroid of the Shaded piece with respect to the neutral axis point one two five Five five point seven five Qb y bar being zero period or zero exclamation mark Is he right a minute to ink? He's not right could be right because you don't need any units when you say zero either if he's right either Y bar Y bar B is zero a B is zero. There's big script a a Because point a was right on the neutral axis. So it was a full half beam. We had to look at B. Where's the shaded area? The big script a for B. It's from that point beyond a way from the neutral axis and There isn't anything beyond So there is no stress no shear stress at point B But there is a point a and now we can figure it out. We've got all the pieces. We've got the shear We've got Q now I We already had and T With the beam at that level thickness of the beam Into the board at that rectangular makes these Agreed Pat you agreed with Oh, did you do this calculation for me? Yeah, thanks. I appreciate that check those numbers. He agreed with somebody Who all right? We all agree. What do we get a small? Element right at each of those places. We can draw the load on those elements So there's a little element at at point a we know that to be in General tension and we know what to have some shears going up on the left side goes down on the right and Remember then The shear all the way around is the same through we calculated there all element at point B It's going to be in compression With no shear so we can draw a element at each of those spots We're gonna be doing that a lot in the next week or two because we're also then going to see what these stresses are We're at some different angle besides just horizontal That's certainly a big deal when you're talking about things like Carbon fiber that can be laid to the particular angle and you can really affect the stresses I Just restate how it was obvious to us that Well, if I have to answer that then it's not off How how how we knew this was compression? Yes, how that well the p over a this the p is The same all the way across the cross section the whole cross section is in axial tension But then because of this loading there's also a bending so at at that cross section we have Tension it also have a Vending such that the top is in tension the bottom is compression So we add to it Change colors. We add to it. I don't have the individual numbers and it goes zero so at the top the two tensions are adding to each other and We know separately what they are well We're at the middle point Our point a is there. That's why this was zero And where point B is we have the tension from the axial load the compression from the bending Which is why we have the minus sign here because this was tension. This was compression and we were left over with some compression And the minus sign would have told you that Or you kept in them separately to say this is so big in tension. This is so weak in compression Whatever's left over is whichever one of those dominates Because a since the moment of zero No at a the moment is not zero We're on the neutral axis. So why is zero and this why is the distance from the neutral axis, right? So I tried to make it clear that why was zero but M is not All right any questions for I get you started on one sign on a post to some wind love so Sign signs like that besides you're the parallel of the ground or parallel of the post I'm is itself 1.2 The email about taking that survey there boy, honey You did oh Thanks a lot. It was anonymous now. I know who did the one response I had no idea who did the one response because it just says anonymous That's like every member once at GE. We were having a Department meeting And that our manager said I want everybody to put all their questions on a card No name. So all the questions are anonymous And they read my question and somebody over there said manning. What jazz that for There was expected pressure on the front of the sign from wind load To kilopascals 2.0 kilopascals wind blow throughout what the compound stresses are At two points one point right there At the base We hopefully we know from our experience, but a lot of these things are going to be worse at the base So I want one on the front of the sign and one at this side of the sign I'll draw that we'll sketch that in because you also need the dimensions of the thing itself supposed to be Circular and that looks too electrical from my perspective See all those little techniques that a hamster gave us are fine Said we gotta work a little quicker than that. So there's there's a cut through the base So we want to see what the stresses are right here and and We can replace this pressure with an equivalent We call it w for the wind force and that's going to be the pressure times the area Do you know where that will act at the center? We'll take this as a uniform Uniformly distributed load. We know we can replace that with a single force acting at the centroid So that'll be dead center of that sign Because of that we're going to see a couple things going on The sign will tend to push the post around which will cause a torsion That we draw with our right hand rule in that direction Right, that's that's tending to twist this post around its base There's also going to be a moment because this force is up in the air trying to bend the whole thing over So with our right hand rule that would be in the minus x direction That's supposed to look like it's laying right along the face there and Then this wind force is also causing a shear Right across the face each of those Contributing to stress the stress loads at each of the places formal force Does a torsion cost what kind of I started normal stress? What kind of normal stress does a torsion cost? It doesn't moment. However a bending moment will cause a Normal stress so that will be my over I from the action of what's going on we understand that that will be Tension causes no normal stresses. So that's all we're going to need for the normal stress at a the Shear stress at a awesome. That's we know to be T roll that's going to be that direction and I or the V Across it is going to be in the opposite direction. Well actually You're less than that you're out. It's going to be equal to the wind load the moment of inertia of the cross-section T the thickness of the cross-section at that point and Q is Q is for this point is Right on the neutral axis with respect to the bending so there'll be no bending moment torsion and shear cause no Normal stresses so at be there'll be no normal stress how it be are the same types of things however in this case Neither are zero to help you out double check. I'll just give you these numbers that will need The wind load which is the pressure times the area is 4.8 kilonewtons. That causes is 31.7 for 4.8. So see what you get for those unless you have to go to work


Greetings to all of you attending the STEMFest 2015 and the session on Skilling a Nation's Future, organized by the Open and Distance Learning Association of Australia. I thank Dr. Som Naidu, President of Audela, for the invitation. Thank you, Som. Many of you know my organization, The Common Wealth of Learning, or CALL. For the benefit of those who don't, a very quick introduction. We are an intergovernmental organization established by the Commonwealth Heads of Government when they met in Vancouver in 1987. We've been in beautiful British Columbia ever since. Our mission is to help the 53 Commonwealth Member States and institutions to harness the potential of distance learning and technologies for expanding access to education and training. The theme of this session is Skilling a Nation's Future. This is also a top priority for Commonwealth Member States. It is a very young Commonwealth with 60% of its population under the age of 30. Governments are looking for cost-effective ways in which the youth can be skilled. In fact, the Indian Prime Minister Modi has called for the three S's. Skills, Speed, Scale. A Nation's Future can be secure if skills are developed at speed and at scale. The organizers have asked us to address two key questions. What are the big game changers in this space? And what are the key priorities for learning and teaching? First, let me identify three distinct but interconnected game changers. One, technology-enabled learning. Two, open education. And three, a networked world. Technology-enabled learning includes, as we know, distance learning, online provision and MOOCs. Policymakers and practitioners embraced these learning technologies as they helped increase access and equity, reduce costs and improve quality in higher education. As more countries began to achieve universal primary education, there was a huge demand for secondary schooling. Even today in sub-Saharan Africa, the transition rate from primary to secondary schools is only 40%. Distance learning was then introduced to expand access to secondary schooling. Similarly, the need for more trained teachers led to the use of distance learning in teacher training. So we can see that the use of distance learning was no longer limited to higher education alone, but now covers all sectors of formal education. When the international community adopted the Millennium Development Goals or MDGs, call began to look for ways in which distance learning could be harnessed to achieve these development goals. This meant deploying distance learning in non-formal and informal sectors as well for a more cost-effective approach. Here is Rihanna Khatun from Bangladesh who started a poultry farming enterprise as a result of this training. Using the flexible and blended learning approach, over 6,000 women have become trained in income-generating skills and more than 1,000 new small businesses have been started in Bangladesh alone under the non-formal skill development program supported by call. The second game changer is open education. This includes flexible workplace-based learning, open education resources or OER and open access policies. Let me just focus on OER. As we know, OER are teaching, learning and research materials, digital or otherwise, either available in the public domain or within open license. The open license allows different degrees of freedom to use, reuse, revise and redistribute any work without barriers or restrictions. In 2012, call and UNESCO with the support of the Hewlett Foundation organized the World OER Congress in Paris that resulted in the OER Paris Declaration. This has had a major impact on governments around the world. Within the Commonwealth, countries as diverse as India and Antigua and Barbuda have adopted OER policies. In Canada, three provincial governments of British Columbia, Alberta and Saskatchewan have committed to promoting OER and open textbooks. In addition, call has developed a directory of OER in skills development and this becomes a useful resource for anyone anywhere in the world. This openness has been extended to calls MOOCs for development. So what's a MOOC for development? A MOOC for development is a MOOC platform which can be offered in low bandwidth situations and uses blended approaches. Call in partnership with IIT Kanpur offered an audio MOOC for skilling gardeners delivered through basic mobile phones using audio content. The content of these MOOCs is now available as OER so anybody can run this skills development program. The third game changer is an increasingly networked world. While in North America there are over 80 internet users per 100 persons, in developing countries the average drops to 34%. However, the rise of mobile telephony has connected even the most remote and deprived. Call offers a new approach called the Lifelong Learning for Farmers or L3F. Call catalyzes the links between the civil society, experts and financial institutions to develop multimedia based learning. Research shows that for every dollar invested, income and assets worth $9 have been generated among these farmers in India who became lifelong learners using basic mobile phones. Not only are these L3F participants learning from experts but also from each other using networked technologies. As we can see the power of these game changers can be harnessed to provide skills at speed and scale. Now coming to the second question, what are the key priorities for learning and teaching? The Millennium Development Goals which have helped the international community to achieve many targets such as universal primary education will come to a close this year to be followed by the Sustainable Development Goals or SDGs that will define this development agenda for the next 15 years. Goal 4 of these 17 SDGs identified focuses on education. The objective of this goal is to ensure inclusive and equitable quality education and lifelong learning opportunities for all by 2030. The goal has several targets. One, quality education must lead to effective learning outcomes. Two, we must focus on developing skills for employment, entrepreneurship and global citizenship. And three, having qualified teachers in place will be critical to achieving these targets. We need to scale our young people at scale in the formal, non-formal and informal sectors. Traditional brick and mortar approaches will not be enough. Odl and technology-enabled learning will become more important than ever before. And with that, let me thank you for your kind attention. Thank you.


In this video we're going to summarize how to encode natural and integral numbers with base 2 or with binary. So regularly what happens if we use, on a regular days, base 10 encoding. Base 10 encoding means we use digits from 0 to 9 for natural numbers. Computers on the other hand can only work with what we call the binary number, binary system. Base 2, which means we only use digits 0 and 1. Now what we need to know is how to translate a number written in base 10 to base 2 and vice versa. Now the process to translate base 10 to base 2 is using what we call successive divisions. And we do those divisions and the remainders of those divisions give us the bits. The translation on the other direction is by adding what we call powers of 2. 2 to the 0, 2 to the 1, 2 to the 2, so on and so forth. There are two things we have to take into account. First, machines always manipulate certain size in terms of bits. And we have to remember that with n bits we can codify 2 to the n different symbols. This is very important for naturals. Now for integers, for integers things get a little bit more complicated. And what we explore, we're three formats. Format number one is what we call sine and magnitude. And the rules for this representation are the following. We're going to represent numbers always positive. And then we add 1 bit to sign, to represent the sign. And that sign is a 0 for the positive sign and a 1 for the negative sign. So any number, any integer represented inside a magnitude will have its leftmost bit, which will be the sine bit, and the rest of the bits will be the magnitude. And this magnitude will be represented as a binary number. Now one first observation here, we realize that leftmost bit is exactly the same as the sign of the number. The second option we study is what is called once complement. Once complement representation has the following rules. If the number is positive, if the integer we try to encode is positive, then we simply use the regular binary representation as if it were a natural number. However, if the number we want to encode is negative, then the way to obtain the binary representation in once complement is following two steps. First, we encode the positive number as binary, and then step number two, very important, we flip all the bits. And that way we obtain the negative number encode as once complement, as we say here. Now the problem that these two representations have is that they both have two codes to represent zero. Number zero is represented with two codes. This is a property of the sine and magnitude, and it's a property of the once complement. So here comes the third alternative we study, which is two's complement. Now with two's complement, the rules are a little bit more complicated than with one's complement, but they're very similar. Positive numbers are still represented as regular binary numbers. Now negative numbers, we follow three steps. Step number one, as before, we encode positive value using binary. Step number two, as in the case of once complement, we flip the bits. And very important, this is the difference. Step number three, in order to obtain the representation of a negative number in two's complement, we add one to the final representation. Now this code over here has two big advantages. It has a unique representation for number zero, and we can reuse the regular addition. We can add two numbers independently if they are represented as two's complement or regular binary, and the rules of the additions are the same, and the result is correct. Now, aside from these two representations of natural number and these three representations of integers, there is one extra representation that is going to become very handy, which is what we call base 16 or hexadecimal. And analysis of these two, instead of 10 digits as in base 10 or 2 digits as in base 2, we have 16 digits that go from 0 to 9 and from A to F. Now, how would we translate a number in base 10 to base 16? We would do successive divisions by 16. However, dividing by 16 when we apply it to binary is the same as taking the least four significant bits. Therefore, this base is actually going to be used as an abbreviation of binary numbers. And basically what we do is two things. We take groups of four, we start by the less significant bit, and we then translate one group, one digit, in order for us not to get confused with these numbers, between these numbers, these numbers, and these numbers, we typically use the prefix 0x for this representation, a little b for this representation, and nothing for the base 10. And this summarizes the encoding of naturals and integers using binary logic.


Thanks for checking this video out. Your mountaintop news video is coming up in just a minute.  Why is it your ad here? Call me. Grace Community Kitchen will be celebrating their 7th anniversary with a spaghetti dinner Thursday, May 26th. Grace Fellowship began serving community meals once a month when they began, but now serve meals twice a week. When we started this thing in 2015, we just had no idea where it was going to go, how it was going to take off. We just knew that there was a need in the community and we just felt with all of our hearts that God wanted us to be a part of meeting that need and we have been blessed to continue and we're ready to celebrate 7 years this Thursday. According to Bailey, the Community Meal Program is an outreach for Grace Fellowship and helps them to connect with the community. Grace Fellowship will also be hosting an indoor yard sale June 1st through the 3rd. Fortunate enough to do this for the last few years and we will have it open those days from 9 to 3 each day. It will be priced to sale so I promise if you walk in, you want to buy something, we will sell it to you and 100% of the proceeds from the yard sale goes to support our free weekly meals. The Grace Community Kitchen serves meals Monday and Thursday from 11 to 1 to anyone who is in need. The Community Kitchen is open to anyone in need. You don't have to be homeless and living on the street. If you're food insecure, if you're hungry, money has run out, there's more mouth than there is money, you're welcome to come by and have our free meal. We don't check anything at the door saying, what is your income? If you have a need, you are welcome. For more information on Grace Fellowship or to make a donation to the Meal Program, go to Grace Fellowship Pikeville KY on Facebook. For Mountain Top News, I'm Breonna Robinson.