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Flat Transformer를 이용한 100W급 On-Board Powr Supply
황치면(C. M. Hwang),송두익(D. T. Song),조정구(J. G. Cho),정창용(C. Y. Jeung),홍승대(S. D. Hong),하태복(T. B. Ha) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
High power density on-board power supply is implemented by using flat transformer. In the high frequency switching converters, large leakage inductance increases the switching stress and duty cycle loss, which sometimes limits maximum switching frequency. The flat transformer is designed by using special core structure, which has very low profile and low temperature rise since the thermal loading is spread evenly over a larger area. lOOW, 3.3V output on board supply is built and tested and 5O.7W/inch³ power density is achieved.
Halothane 마취후 발생한 간괴사 13예의 임상적 고찰
이용구(Y K Lee),김학철(H C Kim),조원섭(W S Cho),조정구(C G Cho) 대한소화기학회 1987 대한소화기학회지 Vol.19 No.1
N/A There were many controversies concerning halothane-induced hepatitis, but a few cases suggest there was clinical, historical, biochemical, immunologial and epidermiological evidence to support theory of halothane induced hepatitis. We described 13 cases who had otherwise unexplained hepatitis after halothane anesthesia. The clinical features and complications were similar to those of any other severe hepatitis, but some differences were noticed. We obtained the results as followings; 1) The most common clinical symptom was high fever, which was noticed in 12 of the 13 cases, and it occurred between the 4th to 16th postoperative day, and its duration was variable, but ranging from 3 to 10 days. 2) The other clinical symptoms were non-specific G-I symptoms, myalgia, headache, easy fatigue and jaundice. And constitiutional prodromal symptoms were developed during or after the post-febrile period, but gradually subsided after the onset of clinical jaundice. 3) Abnormal laboratory findings, espicially AST and ALT, showed a variable increase during the onset of the febrile period or at its conclusion. The peak levels of serum aminotransferases were noticed at the end of febrile period, or the post-febrile period and they gradually normalized after 3 to 6 weeks in the most of the cases. 4) The relative frequency of the unexplained hepatitis was observed as follows; in the 13 cases; above the umbilicus of the operaive site (9), hypotension during operation (8), previous history of surgery under general anesthesia (4), obesity (5). And the fatality rate was 15.1% (2), these two cases showed a prolongation of the prothrombin time 8 seconds over the normal control time.
유동욱(D.W.Yoo),정창용(C.Y.Jeong),백주원(J.W.Baek),조정구(J.G.Cho),조기연(K.Y.Cho),김학성(H.S.Kim),원충연(C.Y.Won) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
A precision high voltage generator for ion injection is implemented on HFZVS-PSCI (Phase-Shift-Controlled Inverter). Some practical aspects of implementing precision high voltage generator with HFZVS-PSCI, such an a HFHV transformer, multiflier, and precision CR divider are fast dynamic response, low ripple voltage, and high accuracy.<br/> <br/>
공진 인덕터 보조권선을 이용한 개선된 LCLC 공진형 컨버터
백주원(J. w. Baek),이영식(s. Y. Lee),정창용(c. Y. Jeong),조정구(J G. Cho),김흥근(H. G. Kim) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
An improved series-parallel resonant converte using auxiliary winding of resonant inductor i presented The conventional series-para1lel resonan converter and newly developed converter are compared for high voltage application. This proposed converter gives several merits such a wide load ranges, sma1l circulating current, low peak voltage at no load. Two experimental results for the proposed converter and conventional one are presented for conventional LCC type converter and the proposed one.
고압 대전류 펄스 전계를 이용한 저온 살균장치 시스템 연구
백주원(J.W.Baek),유동욱(D.W.Yoo),조정구(J.G.Cho),정창용(C.Y.Jeong),Pavlov,김학성(H.S.Kim),김흥근(H.G.Kim) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
The non-thermal pasteurization of foods using High Voltage High Current Pulsed Electric Fields (HVHC-PEF) is a promising technology and a sound complement or replacement to traditional thermal pasteurization The conventional thermal method also inactivates bacteria and other microorganisms harmful to humans, but degrades natural color, flavor, texture and nutrients. At this point, a non thermal pasteurization technique, HVPEF is thought to be a new processing technique which is able to produce a good quality foods nutritional as well as sensuous In this paper, the system for HVHC-PEF pasteurization is presented. It use square wave pulse instead of exponential ones. So, power rating of system is reduced considerably. Design considerations for 20㎸ 500A class equipment are analyzed and experimental results are discussed.<br/> <br/>
수술전 경피적경간문정맥도자술로 국소화한 췌장소도세포비후 1 예
김학철,조정구,정영선 대한내과학회 1987 대한내과학회지 Vol.34 No.1
The pancreatic beta islet cell disorders associated with hyperinsulinism include adenoma and carcinoma, which are unifoca1; and adenomatosis, hyperplasia and nesidioblastosis, which may involve the entire pancrease either focally or diffusely. Methods of preoperative localization of pancreatic islet cell tumors include highly selective arteriography, percutaneous transhepatic portal venous sampling at several sites with radiolimmunoassay of portal venous plasma insulin, computerized tomography, and ultra- sound. A 42-year-old woman with clinical features of fasting hypoglycemia had inappropriately elevated I/G ratio during a prolonged fast. Abdominal CT scan, and angiography failed to demonsrtrated the lesion and resection of 85% of the distal pancrease revealed no evidence of a tumor, but transhepatic portal vein catheterization with radioimmunoassay of regionally sampled portal vein insulin level suggessted the lesion with localized step-up in insulin levels occurred at the tail and body of the pancrease. Pathologic examination of the resected pancrease revealed the findings of focal islet hyperplasia. We believed if the CT, ultrasound and arteriogram failed to visualized the lesion in patient with hyperinsulinism, one should proceed with transhepatic portal vein catheterization.