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김봉섭(Kim Bong-Seup),김영중(Kim Young-Jung),박도영(Park Do-Young) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.10
자기부상열차는 직류 전원을 사용하여 부상용 전자석으로 주행선로와 10㎜ 내외의 부상상태를 유지하면서 교류 전원을 이용한 선형 유도전동기로 추진하는 방식이다. 본 논문에서는 실차 모델의 자기부상열차에 대한 전자파를 측정하여 국내 전자파인체보호기준 및 세계 권고기준과 비교 분석하였다.
김봉섭(Bong-Seup Kim),고준균(Joon-Kyun Koh),박도영(Do-Young Park),강병관(Byung-Gwan Kang) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
This paper introduces the performance test of the prototype vehicle which will be in operation for Urban Maglev Program. While common trains with steel wheels use rotary induction motors for propulsion maglev trains gain thrust force from linear induction motors maintaining the constant airgap with levitation electromagnets. Therefore not only the behavior of the linear induction motor should be well understood but also the way of propulsion that minimizes its effect on the levitation system should be took into account. Performance test procedures of maglev trains are proposed and carried out and the characteristics of acceleration and deceleration are verified to agree with the design criteria. Tests are mainly performed on the linear section of the test line and the driving characteristics on the section with a 6‰ incline are examined additionally. As a result the performance of the prototype vehicle in the reverse operation can satisfy the requirement about the acceleration and deceleration 4.0m/s2. And the design modifications of the commercial vehicle and the performance specifications required on the demonstration line are investigated.
김봉섭(Kim Bong-Seup),김동성(Kim Dong-Sung),김창현(Kim Chang-Hyun) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
Urban maglev vehicle is scheduled to be inaugurated in 2013, in Incheon international airport, Korea, and is attracting public attention. Korea's Urban Maglev Program started in 2006, and the second developing stage of the project is in progress now, as for June 2009. The maglev train is a high-tech and environmentally friendly transportation system. The first maglev was commercialized and is in service in Japan. Aiming for the commercialization and finding a new market, Korean government also drives the development of the urban maglev with pure domestic technology. During the period of the development, it is mandatory to pass the performance tests reflecting Korean railway safety and urban railway regulations before the vehicle is manufactured and commercialized. Therefore, appropriate performance test procedures should be devised, and the design specifications and performance evaluation should be verified through the related test suite under the supervision of an official testing organization. Performance evaluation is necessary procedure to validate the reliability and safety of the developed maglev vehicle before commercial service. Regarding to the above project, the list of required tests for 'Test and Evaluation of Urban Maglev', components of the maglev vehicle, a prototype of the maglev (including a trial run on a test line), and a plan about test runs on the demonstration line will be introduced in this paper.
EM-PM 복합식 자기부상열차의 Zero-Power 부상 제어
김창현(Kim Chang-Hyun),김봉섭(Kim Bong-Seup),김동성(Kim Dong-Sung) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
Minimizing driving power consumption is crucial for a magnetically levitated (maglev) vehicle because it has batteries or noncontact power source. In case of the maglev vehicle using electromagnet/permanent (EM-PM) hybrid systems, the power consumption can be reduced when the total weight is levitated by the PM and the EM is controlled to compensate the instability due to weight variation or external disturbance. This paper deals with a zero-power levitation control method for an EM-PM hybrid maglev vehicle. First, a state feedback controller to maintain a constant gap is introduced. Next, the zero-power levitation control, which reduces the driving current to zero, is proposed by modifying the state feedback controller. In the proposed method, the current controller is supposed to be included in the target system and the zero-power control is implemented based on the command voltage input to the current controller. The performance of the proposed controller is verified with simulations using a hybrid maglev testing system.
Management of endoscopic retrograde cholangiopancreatography-related perforations
Byung Seup Kim,In-Gyu Kim,Byoung Yoon Ryu,Jong Hyeok Kim,Kyo Sang Yoo,Gwang Ho Baik,Jin Bong Kim,Jang Yong Jeon 대한외과학회 2011 Annals of Surgical Treatment and Research(ASRT) Vol.81 No.3
Purpose: The purpose of this study is to analyze the treatment strategies of patients with endoscopic retrograde cholangiopancreatography (ERCP)-related perforations. This is a retrospective study. Methods: We experienced 13 perforations associated with ERCP. We reviewed the medical recordsand classified ERCP-related perforations according to mechanism of injury in terms of perforating device. Injury by endoscopic tip or insertion tube was classified as type I, injury by cannulation catheter or sphincterotomy knife as type II, and injury by guidewire as type III. Results: Of four type I injuries, one case was managed by conservative management after primary closure with a hemoclip during ERCP. The other three patients underwent surgical treatments such as primary closure orpancreatico-duodenectomy. Of five type II injuries, two patients underwent conservative management and the other three cases were managed by surgical treatment such as duodenojejunostomy, duodenal diverticulization and pancreatico-duodenectomy. Of four type III injuries, three patients were managed conservatively and the remaining patient was managed by T-tube choledochostomy. Conclusion: Type I injuries require immediate surgical management after EPCP or immediate endoscopic closure during ERCP whenever possible. Type II injuries require surgical or conservative treatment according to intra- and retro-peritoneal dirty fluid collection findings following radiologic evaluation. Type III injuries almost always improve after conservative treatment with endoscopic nasobilliary drainage.
Zero-Power Control of Magnetic Levitation Vehicles with Permanent Magnets
Chang-Hyun Kim,Han-Wook Cho,Jong-Min Lee,Hyung-Suk Han,Bong-Seup Kim,Dong-Sung Kim 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
This paper deals with the zero-power control of magnetic levitation (maglev) vehicles that use permanent magnets as well as electromagnets for levitation. The nominal load is levitated by permanent magnet and the current consumption for stable levitation can be reduced. In order to guarantee the tracking capability, the proposed controller is based on the state feedback controller and modified to balance attraction force and total weight. The commanded voltage is used instead of the coil current in the feedback loop so that the current measurement can be avoided. A full-scale hybrid maglev tester was constructed and some experiments were carried out to show the performance of the proposed method.
Levitation Control of a Hybrid-Excited Magnetic Levitation Vehicle
Chang-Hyun Kim,Han-Wook Cho,Jong-Min Lee,Hyung-Suk Han,Bong-Seup Kim,Dong-Sung Kim 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
In this paper, the levitation control of a hybrid-excited magnetic levitation (maglev) vehicle is presented. Both electromagnets and permanent magnets are used to levitate the vehicle. The nominal load is levitated by permanent magnet and the current consumption for stable levitation can be reduced. In order to guarantee the tracking performance, the proposed controller is based on the state feedback controller and modified to balance attraction force and total weight. The commanded voltage is utilized instead of the coil current in the feedback loop so that the current measurement is not necessary. A small-scale hybrid-excited maglev vehicle was constructed and some experiments were carried out to show the performance of the proposed control method.
자기부상열차 이중화 마그네트 드라이버의 실차 적용 연구
김창현(Chang-Hyun Kim),김봉섭(Bong-Seup Kim),김동성(Dong-Sung Kim),한형석(Hyung-Suk Han) 한국철도학회 2017 한국철도학회 학술발표대회논문집 Vol.2017 No.05
자기부상열차는 전자석의 자기력으로 궤도와의 간격을 일정하게 유지하며 비접촉으로 주행하는 열차이다. 마그네트 드라이버는 부상력 조절을 위해 전자석에 흐르는 전류를 조절하는 장치로 자기부상의 핵심 구성품 중 하나이다. 고장상황에 대비하여 시스템 신뢰성을 높이기 위해 이중화된 마그네트 드라이버를 개발하였다. 마그네트 드라이버의 제어부와 전력부가 이중화 되었으며, 본 논문에서는 개발된 이중화 자기부상 마그네트 드라이버를 실차에 적용하여 시험한 결과에 대해 다루고자 한다. A maglev train can move without any contact while keeping a constant airgap from the guideway using magnetic force of the electromagnet. A magnet driver is the device which regulates the current through an electromagnet for levitation force control, and is one of the core components. A dual magnet driver is developed to cope with system failure and to increase the reliability of the overall system. The control and power units of the magnet driver are duplicated, and the application of the developed dual magnet driver to the full-scale maglev train will be studied in this paper.