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박영주(Y.J.Park),이규송(K.S.Lee),류시찬(S.C.Lyu) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
In This paper describes the development testing results of high density high Voltage Power Supply(HVPS) that employ microwave TWTs<br/> The HVPS consist of number of modules connected in series A new design that adapt resonant circuit and high density pulse transformer to the high voltage modules makes the HVPS much more reliable. Also high voltage Solid-State modulation using fast switching devices(FET's) and the test results of modulator modules development are represented.
CAT(Computer Adaptive Test) 시스템 구축을 위한 문항반응이론(IRT)의 문항분석 비교연구(1)
이창규 ( Chang Kyou Lee ),이승관 ( S. G. Lee ),조경진 ( K. J. Cho ),이은일 ( E. I. Lee ),이숙자 ( S. J. Lee ),박은숙 ( E. S. Park ),박영주 ( Y. J. Park ) 대한임상검사과학회 2000 대한임상검사과학회지(KJCLS) Vol.32 No.3
Prior to CAT, the parameter estimation on executed items should be accomplished by IRT.and the item banking must be build up on the basis of the parameter of difficu1ty. A program developed by Korea ETS, Bilog and Bigsteps were all found to be very powerful to understand the attributes of items. Though multiple true-false type K items have some merits, the items should be examined quantitative1y if they are appropriate or not by IRT. Through the study we have fmally confmned that the new program developed by Korea ETS has its abi1ity to check the validities of items from preparing or scoring to item analysis.