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김길동(Gil-Dong Kim),신정렬(Jeong-Ryol Shin),이우동(Woo-Dong Lee),박현준(Hyun-Jun Park),김희중(Hee-Jung Kim) 한국철도학회 2004 철도저널 Vol.7 No.3
This paper describes a low-cost single-phase active power filler, which consists of a half-bridge PWM inverter with a simple control circuit. In order to verify the performance of proposed active power filter, many computer simulations with EMTP codes and experimental works with a hardware prototype were done. Both results confirm that the proposed active power filter shows excellent performance to eliminate the harmonics generated in the single-phase non-linear load. The active power filter has advantage of low implementation cost and compact size, using a half-bridge inverter and a simple control circuit with only one current sensor. So, it can be fabricated as a plug-in type. This paper shows the necessity and a good possibility to apply such advantage to the electric railway system
전폐절제술시 폐관류스캔을 이용한 폐기능의 예측에 대한 평가
김길동,정경영,Kim, Gil-Dong,Jeong, Gyeong-Yeong 대한흉부심장혈관외과학회 1995 Journal of Chest Surgery (J Chest Surg) Vol.28 No.4
Surgical resection of lung cancer or other disease is recently required in patients with severely impaired lung function resulting from chronic obstructive pulmonary disease or disease extension. So prediction of pulmonary function after lung resection is very important in thoracic surgeon. We studied the accuracy of the prediction of postoperative pulmonary function using perfusion lung scan with 99m technetium macroaggregated albumin in 22 patients who received the pneumonectomy. The linear regression line derived from correlation between predicting[X and postoperative measured[Y values of FEV1 and FVC in patients are as follows: 1 Y[ml =0.713X + 381 in FEV1 [r=0.719 ,[P<0.01 2 Y[ml =0.645X + 556 in FVC [r=0.675 ,[P<0.01 In conclusion,the perfusion lung scan is noninvasive and very accurate for predicting postpneumonectomy pulmonary function.
김길동,정경영,Kim, Gil-Dong,Jeong, Gyeong-Yeong 대한흉부심장혈관외과학회 1994 Journal of Chest Surgery (J Chest Surg) Vol.27 No.4
From 1973 through June 1993, 25 patients underwent pulmonary resection for pulmonary metastases from carcinoma or sarcoma at our institution. There were 11 carcinomas and 14 sarcomas. 24 patients[96% complete] could follow-up and the median follow-up time was 20 months with a range of 4 months to 271 months and total follow-up period was 1105 months-patients. In our patients, actuarial 5-year survival rate was 49%, mean survival time was 66.6$\pm$12.6 months and median survival time was 84 months. Patients with sarcoma, more than 24 months of the tumor-free interval, postoperative adjuvant therapy had a better survival than did those with carcinoma, less than 24 months of the tumor-free interval, no postoperative adjuvant therapy. But there were no statistical differences between two groups[P>0.05]. This results recommend more aggressive surgical treatment for pulmonary metastases.
김길동(Gil dong Kim),오세찬(Sehchan Oh),이장무(Changmu Lee),이한민(Hanmin Lee),박현준(Hyunjune Park) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.11
Due to the demand for high-output motors in the limited space between the wheels in an electric train, self-ventilating traction motors have been used for many years. periodical disassembly maintenance is necessary to remove the small Quantities of dust that enter the motor from the open-air ventilation. Reducing this burden, as well as increasing efficiency and reducing noise, would benefit the next generation of motors To address these needs, KRRI is developing a fully enclosed type traction motor, a fully enclosed type traction motor with outer fans, a high-efficiency permanent-magnet synchronous motor and a direct-drive motor(DDM)as traction motors for the next generation of trams.
폐에 전이된 거대 연조직 육종(혈관외피세포종, 활막육종) -수술치험 2례-
김길동,정경영,신동환,Kim, Gil-Dong,Jeong, Gyeong-Yeong,Sin, Dong-Hwan 대한흉부심장혈관외과학회 1994 Journal of Chest Surgery (J Chest Surg) Vol.27 No.1
We report two cases of giant soft tissue sarcomas metastatic to the lung from lower extremities. The lung metastasis occurred 2 years later from original diagnosis in 27-year-old woman with hemangiopericytoma and 8 years later in 54-year-old woman with synovial sarcomtt. We had performed pleuropneumonectomies with partial resection of pericardium involved. The postoperative courses were uneventful and postoperative adjuvant therapy was begun.
김길동(Gil-Dong Kim),이한민,오세찬(Seh-Chan Oh),정의진(Eui-Jin Joung) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
최근 철도 차량의 대부분은 인버터 제어에 의한 유도전동기를 채택하여, 많은 사용상의 이점을 내고 있다. 하지만 이 인버터 제어는 장치의 소형 경량화, 저비용화의 관점에서, 1대의 인버터로 복수의 유도 전동기를 구동하는 방식이 주류이다. 최근, 고성능화로 영구자석을 사용한 동기전동기는 산업용, 전기 자동차용과 모든 분야에서 주목을 받아, 소형 · 경량 · 고효율”의 특징을 살려서 유도전동기를 대신하여 고성능 모터의 주역이 되고 있다. 본 논문에서는 철도 차량용 주전동기로 이 영구자석 직접구동전동기를 개발하여 기존 유도 전동기와 비교하여 성능을 평가 하였다. 실험을 통해 영구자석 직접구동전동기는 기존 유도전동기에 비해 고 효율화, 유지보수성 향상 등의 효과가 있음을 알 수 있다.
김길동(Kim Gil Dong),이한민(Lee Han Min),박성환(Park Sung Hwan) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
In the braking process of rolling stocks, the equivalent braking force is applied to the all bogies. However, the load applied to the front and rear bogie are different in the actual commercial traveling. In the case, since the different slip situation is occurred in each bogie, it is essential to use the independent anti-slip control per bogie unit in order to reduce the loss of braking force. In this paper, the algorithm about bogie unit braking is proposed and verified.