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홍순찬(Soon-Chan Hong),김경원(Kyung-Won Kim) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
This paper studies the scope and text summary of international standards related to adjustable speed de drive systems, especially IEC 61800-1and IEC 61136-1 IEC 61800-1 applies to general purpose adjustable speed dc drive systems which include the power conversion, control equipment, and also a motor or motors, This standard applies to power drive systems connected to line voltages up to 1kV a c, 50Hz or 60Hz IEC 61136-1 provides alternative methods for specifying ratings for semiconductor power convertors for adjustable speed electric drive systems, particularly for dc motor drives.
가변속 전력구동시스템 관련 특수 시험방법을 포함한 EMC 제품규격에 관한 연구
홍순찬(Soon-Chan Hong),서영민(Young-Min Seo),김경원(Kyung-Won Kim) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
IEC 61800 is an international standard on adjustable speed electrical power drive systems, which consists of three parts IEC 61800-1 and IEC 61800-2 apply to DC power drive systems and AC power drive systems, respectively, which include power conversion, control equipment, and also a motor or motors IEC 61800-3 specifies EMC(Electro Magnetic Compatibility) requirements for adjustable speed AC or DC motor drives connected to main supplies up to AC 1,000 volts This paper studies the standards related to EMC and the text summary of international standard IEC 61800-3 Which is an EMC product standard including specific test methods
빈혈과 (貧血) 부분적 장폐쇄를 (腸閉鎖) 동반한 Peutz - Jeghers 증후군 (症候群) 보고
홍순찬 ( Soon Chan Hong ),김영채 ( Young Chai Kim ),이종석 ( Jong Suk Lee ),고경혁 ( Gyung Hyuck Ko ),최상경 ( Sang Kyung Choi ),박순태 ( Soon Tae Park ),정성훈 ( Sung Hoon CHUNG ),하우송 ( Woo Song Ha ),장세호 ( Se Ho Chang ) 대한소화기학회 1988 대한소화기학회지 Vol.20 No.2
The Peutz-Jeghers syndrome is an autosomal dominant hereditary disease characterized by hamar- tomatous polyps of the gastrointestinal tract and by mucocutaneous melanin deposits. This syndrome is clinically irnportant because of the complication caused by the gastrointestinal polyp, leading to abdominal pain, gastrointestinal bleeding and intussusception. We experienced a case of Peutz-Jeghers syndrome who was complained of dizziness, abdominal pain, melanin pigmentations of the lips, oral mucosa and digits. Pathologic findings on gastrofiherscopic polypectomy showed hamartomatous polyp.
홍순찬(Soon Chan Hong) 대한공업교육학회 1980 대한공업교육학회지 Vol.5 No.2
For digital computation of inverter circuits, the generalized state equations by using logic variables decided by SCR` s states are derived and those are solved by Euler`s method. The SCRs are considered to ideal switch when they are off and a small resistance when they are on. Advantage of this method is that the generalized state equations can be set up regardless of mode change and that computation error created by iteration calculation is reduced by reduction of program. The digitally computed results of series inverter with an R load are presented and shown to be in close agreement with theoretical results.
쵸퍼에 의한 직류전동기 (直流電動機) 속도제어계통의 과도해석에 (過渡解析) 관한 연구
홍순찬(Soon Chan Hong),박영진(Young Jeen Park) 대한공업교육학회 1995 대한공업교육학회지 Vol.11 No.1
The paper deals with the transient analysis of a dc series motor, controlled by a chopper with time-ratio control with square-wave output voltage. The main problem in the analysis of the chopper-fed dc series motor for steady-state and transient-state arises due to the nonlinear relation between the armature-induced voltage and the armature current. This paper presents generalized methods of transient analysis of chopper-fed dc series motor taking into account nonlinearity and suggests linear approximation methods of magnetization characteristic of the dc series motor. Moreover, the method requires much less computation time than is necessary for a step-by-step solution of the system differential equation, for different modes of the chopper cycle. Based on the methods, computer simulations are carried out. As a result, it is known that the methods are available by experimentations. This method can be used for driving transfer functions of the time-ratio chopper-controlled dc series motor for small-signal perturbation around a steady-state operation point.