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서경호,이재민 대한전자공학회 1994 전자공학회논문지-A Vol.31 No.10
BiCMOS circuits mixed with CMOS and bipolar technologies show peculiar fault characteristics that are different from those of other technoloties. It has been reported that because most of short faults in BiCMOS circuits cause logically intermediate level at outputs, current monitoring method is required to detect these faluts. However current monitoring requires additional hardware capabilities in the testing equipment and evaluation of test responses can be more difficult. In this paper, we analyze the characteristics of faults in BiCMOS circuit together with their test methods and propose a new design technique for testability to detect the faults by logic monitoring. An effective method to detect the transition delay faults induced by performance degradation by the open or short fault of bipolar transistors in BiCMOS circuits is presented. The proposed design-for-testability methods for BiCMOS circuits are confirmed by the SPICE simulation.
서경호,허만하 고신대학교(의대) 고신대학교 의과대학 학술지 1989 고신대학교 의과대학 학술지 Vol.5 No.1
To evaluate alterations in endoplasmic reticulum(ER) and ribosomes in human hepatocellular carcinoma(HCC) with special reference to the relationship between the histological types and the degree of differentiation and the morphological and quantitative alterations in the component malignant cells, light and electron microscopic observations are carried out in 7 cases of human HCC. The specimens are obtained during lobectomy procedures for this purpose. Morphological alterations of ER of the component cells of HCC include irregular hypertrophy characterized by marked dilatations of cisternae and papillary projections associated with depletion of ribosomes, which have been reported earlier by a number of investigators. These changes are not correlated with the histological and the cytological patterns of HCC. To estimate quantitative alterations of ER, a scoring system designed for this study is applied and it is concluded that the reduction of ER is correlated with the degree of dedifferentiation of neoplastic liver cells, but not related to the histological and the cytological types of human HCC.