march december belgian mathematician electrical engineer russian origin produced important work field electrical network theory born parents fleeing settled belgium worked early computer construction projects responsible number circuit introduced known scattering parameters interest languages found mathematical law published machine languages field interest transmission lines published line worked telephone introduced mathematical construct conference matrix early life born march incorporated russia time finland parents russian mother ethnic pole attempting flee home russia escape revolution father opposed heavily pregnant mother succeeded crossing border finland continued born birth registered headed husband father principal russian school father arrested follow deported siberia died seeing son small child emigrated mother belgium education educated french belgium july notre dame college aged enrolled studied electrical mechanical engineering graduating gained phd applied sciences university sponsor second advisor founder field network synthesis university taught circuit theory mathematical subjects related electrical science special professor worked electrical engineer primary interest mathematics especially tradition belgium gifted entering engineering pure mathematics physics showed mathematical preferring use chalk audio visual aids lectures way presenting opening lecture large audience international conference london career graduating joined antwerp originally headquartered brussels european holdings sold head transmission department came contact great influence leading circuit day time worked berlin sister company umbrella died second world war long continued consider works highest authority matters circuit theory involved design electronic computers developing belgian government purpose program catch advances english speaking world war resulted construction machine represented electrical engineering aspect project director brussels operated computer government initially rack prototype operational tasks calculation functions rack machine moved antwerp service machine investigate functions head newly formed later research laboratories belgium director research facility specialised applied mathematics heavily involved computing research stayed post retirement november died december survived daughter wife works best known contributions circuit theory particularly mathematical basis filters coupled lines non linear circuits editorial board foundation major contributions information theory electronic computers mathematics dominated international conferences prone asking searching questions papers causing discomfort conference chairman session gave presentation asking questions stopped attending conferences mid-1970s exception montreal order receive centennial medal circuit theory scattering matrix introduced important idea scattering matrix called matrix work reproduced later paper terminal networks belgium occupied nazi_germany world war prevented communication american colleagues war discovered idea scattering matrix independently american scientists developing military radars american work montgomery published work applied scattering circuits certainly americans concerned distributed circuits microwave frequencies radar produced textbook published covered field passive port circuits work extensive use established parameters scattering matrix concept succeeding field coherent eponymous explained book provides method determining possible construct passive circuit elements circuit consisting represents given scattering matrix telephone introduced mathematical concept conference called originally arose connection problem working concerning telephone applications range fields interest pure mathematics studying setting telephone connecting ideal turns necessary condition setting conference telephone ports ideal signal loss existence conference matrix ideal signal loss means loss splitting signal conference subscribers dissipation conference network existence conference trivial question exist values values exist form sufficient condition conference exist exist obtained complete solutions noted multiple solutions work circuits wrote comprehensive summary history circuit theory interest transmission lines published papers subject include papers skin effects lines introduced great gives occur construction filter banks digital systems apparently work obscure difficult understand frequently cited version later published educated french continued speak russian mother died fact able speak languages read studied sanskrit etymology languages wrote book human machine languages explored idea applying mathematics information theory obtain results human languages book highlighted difficulties machine understanding language naive enthusiasm researchers 1950s wrote paper statistical laws linguistic distribution gives known relationship law law complex law provide relationship frequency word occurrence languages word rank simplest form law frequency proportional rank expressed large class statistical normal distribution terms rank expanded expression taylor series case obtained remarkable result order series resulted law second order taylor series resulted law gives insight reason law found hold wide variety languages control systems played developing mathematical test determining linear control systems system moved state system state space finite time application control test known test test determining system ability determine state system finite time solely system test originally discovered gilbert version applied systems represented matrix test subsequently honours fellow vice chair section formed awarded centennial medal society award called mac van member received honorary doctoral degree switzerland rewarded belgian royal medals circuits systems society instituted award work circuit theory award presented selected publications prolific publisher pages scientific output publishing career right retirement books des machines office french french french san_francisco day journal articles extension method transformation band pass filters march loss effective phase shift composite filters cut frequencies june transmission losses terminal networks development design filters march theory terminal networks application conference september topics design loss filters december information series french statistical laws linguistic distribution french summary history circuit theory proceedings scattering applications passive network synthesis research reports non rational positive real functions march theory proximity effect cables ratio positive real function journal mathematical analysis ideal ports april
Vitold Belevitch