dearsirormadam:
thepurposeofthisletteristorecommendmr.yi,aworthycandidateforadmissiontoyourgraduateprogram.
mr.yihaveevertookmycourse"introductiontocontrol".iwasdeeplyimpressedwithhimnotonlythegoodscore"a"hegotintheclassbutalsothehighlyactiveanddevoutattitudehelearncontroltheory.sometimes,hecametomyofficetoaskmesomeinterestingquestionsaboutthecontrolandsystemtheoriesnotmentionedintheautobiologyofmyclassandtodiscussthedevelopmentandapplicationofcontroltheoryinscienceandindustrywithme.heimaginedthistheoryistrulyanamazingsubject.ifpeopleunderstandanduseitverywell,thisworldwillgetbetter."well!"ithought,"thisyoungmanisreallylikecontrol."
thenhetookpartinmyresearch"designofsinusoidaloscillatorsusingthetheoryofvariablestructuresystems"(publishedintheint.j.ofelectronics,1992,vol.72,no.1)todesigntheoscillatorcircuits.fromsimulatingthecircuitshedesignedwithpspicetoassemblingtheelectronicelements.heshownmetheenthusiamandhardilyspiritinhiswork.whengettinganewideaorfindingsomequestions,healwayssharedhisopinionabouthowtoovercometheerrororimprovetheexperimentresultstome.aftertry-and-errorandamelioratingthecircuitmanytimes,wefinallygotarefinedbutgood-performanceoscillator.
mr.yialsogotadmirablegradesinacoupleofcoursesofcontrolandsystems,itrulybelievehehasstronglearningcapabilityandenthusisminthisfield.soinodoubtthathewillbecomeagoodstudentinyouresteemeddepartment.shouldyouneedanyfurtherinformationaboutmr.yi,pleasedonothesitatetocontactme.
sincerelyyours
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