http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 홍순찬 ( Soon Chan Hong ) (검색결과 209 건)
- 무료
- 기관 내 무료
- 유료
-
홍순찬(Soon-Chan Hong),유종걸(Jong-Gul Yoo) 전력전자학회 1999 전력전자학술대회 논문집 Vol.- No.-
This paper studies the scope and text of international standards related to DC supplied electronic ballasts for tubular fluorescent lamps, especially lEC 60925. lEC 60925 specifies general performance requirements for electronic ballasts for use on DC supplies having rated voltages not exceeding 250V associated with tubular fluorescent lamps. The standard specifies also particular performance requirements for DC electronic ballasts for public transport lighting, general lighting, and aircraft lighting
-
Nitric Oxide 가 담낭의 운동성에 미치는 영향
홍순찬(Hong Soon Chan),장기철(Chang Ki Churl) 한국간담췌외과학회 1999 Annals of hepato-biliary-pancreatic surgery Vol.3 No.1
The Effect of Nitric Oxide on Gallbladder MotilityHong Soon Chan, Chang Ki Churl*Department of Surgery, Department of Pharmacology*Gyeongsang National University College of Medicine(Background/Aim) Abnormality in GB motility is related with many gallbladder diseases including GB stone. Gallbladder motility is controlled by both hormonal and neural mechanisms. CCK, gastrin, motilin play a role on gallbladder contraction and VIP, somatostatin are inhibitory agents. Nitric oxide(NO) is known to account for the biologic properties of endothelium dependant relaxing factor. It also plays an important role in mediation of relaxation in various types of non-vascular smooth muscle of GI tract. The objective of this study was to determine the effect of nitric oxide in human gallbladder muscle.(Method) In this study, nitric oxide was generated by photolysis using long wave-length UV lamp(366 nm) on NO carrying molecule, streptozotocin. GB muscle strips were obtained from 10 cholecystectomized patients and contracted by potassium or CCK-8. We also investigated the effect of methylene blue, which is a inhibitor of guanylate cyclase, after addition of methylene blue to the organ bath containing streptozotocin. Gallbladder movements were recorded using Polygraph(Grass model 79E, USA). And we identified the production of nitric oxide using nitrite assay in our No generating system.(Results)1. Streptozotocin, No containing compound, released NO when UV irradiated. The longer UVR and the higher concentration of STZ, the larger is the amount of produced NO.2. The human GB muscle was relaxed immediately by photo-induced NO and rapidly disappeared. The maximal relaxation under STZ, 60 sec UVR was 23.1 % comparing potassium or CCK induced contraction.3. The relaxation was significantly inhibited by methylene blue, the inhibitor of gualylate cyclase.(Conclusion) According to above results, we confirmed that nitric oxide relaxed human gallbladder muscle. And we think that the further study should be done to examine whether the L-arginine/NO pathway exist in human GB.
-
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),채수용(Soo-Yong Chae),정대택(Dae-Taek Chung),김희선(Hee-Sun Kim) 한국조명·전기설비학회 2010 조명·전기설비학회논문지 Vol.24 No.6
절연된 부스트 변환기는 전기적인 절연과 매우 높은 승압을 필요로 하는 응용분야에 적합한 변환기이다. 낮은 입력전압을 높은 출력전압으로 승압하기 위해 필요한 변압기는 volt-sec 평형 조건을 만족하여야한다. 기존의 절연된 부스트 변환기는 도통구간을 오버랩하여 제어하였으며 이 경우 제어회로가 복잡해지는 문제가 있다. 본 논문에서는 변압기의 volt-sec 평형을 위해 리셋권선을 설치하고 자기구동 스위치를 이용하여 제어회로를 간단하게 구성할 수 있는 절연된 부스트 변환기를 제안하고 해석한다. 마지막으로 출력 10[W]급의 절연된 부스트 변환기를 구성하여 시뮬레이션하고 실험을 수행하여 제안한 변환기의 이론적 해석의 타당성을 입증하였다. Isolated boost converter is desirable in the dc/dc converter applications where isolation is required and extremely high step up is needed. Transformer used to step up low input voltage into high output voltage must satisfy the volt-sec balance condition. Conventional isolated boost converter is controlled with conducting intervals overlapping. In this case, there is a problem that control circuit is complicated. In this paper, it is proposed and analyzed the isolated boost converter which set up a reset winding for the volt-sec balance of transformer and can construct the control circuit simple by using a self-driven switch. Finally, the validity of the theoretical analyses for the proposed converter is verified by both simulations and experiments on the 10[W] class isolated boost converter.
-
-
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
-
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.
-
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.
-
-
ScienceON연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
