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개방형 자기공명영상시스템용 경사자계코일의 새로운 설계기법
이수열,박부식,이정한,이완,Lee, Soo-Yeol,Park, Bu-Sik,Yi, Jeong-Han,Yi, Wan 대한전자공학회 1997 電子工學會論文誌, S Vol.s34 No.1
Most open magnetic resonance imaging systems have used the planar gradient coils whose inductances were minimized through the magnetic energy minimization procedure in the spatial frequency domain. Though the planar gradient coils have smaller inductance than conventional gradient coils, the planar gradient coils often suffer from their poor magnetic field linearity. Scaling the spatial frequencies of the current density function designed by the magnetic energy minimization, magnetic field linearity of the planar gradient coils can be greatly improved with small sacrifice of gradient coil inductance. We have found that the figure of merit of the planar gradient coils, defined by the gradient strength divided by the linearity error and the inductance, can be improved by proposed technique.
쿠바 주파수조정 ESS 운영 전략 검토: 주파수 보상 효과 분석
김수열,이성은,김진태,Kim, Soo-Yeol,Lee, Seong-eun,Kim, Jin-tae 한국전력공사 2020 KEPCO Journal on electric power and energy Vol.6 No.2
KEPCO has installed Frequency Regulation ESS (FR ESS) of 376 MW since 2015. Frequency Regulation is ancillary service to support stabilizing system frequency, which is divided into governor free and automatic generation control. KEPCO operates FR ESS as governor free application and leads FR ESS market with capability of diverse demonstration and operation experiences. To expand FR ESS role during transient states of power system, KEPCO has extended operating time of charging and discharging. KEPCO has also changed speed droop lower than before to improve contribution on frequency compensation, and acquired much experiences of differentiating bad cells from others. Based on these technologies and know-hows, KEPCO Research Institutes received request of feasibility study and technical cooperation for overseas FR ESS business. This paper suggests the simple and practical method for making technological feasibility study of FR ESS.
동시 진공증착한 Ag - Co 미세입상 합금박막의 구조, 자기 및 자기저항 특성
이수열(Soo-Yeol Lee),이성래(Seong-Rae Lee) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.1
The structure, magnetic properties and magnetoresistance phenomena of Ag-Co nano-granular alloy films prepared by a thermal co-evaporation were studied. Supersaturated fcc Ag-Co solid solution and fcc Co clusters coexisted in the as-deposited state. As Co content increases from 20 to 55 at. % Co, the grain size of the Ag matrix decreases from 147 to 67Å, and the Co solubility in the Ag matrix increases from 2.5 to 6.7 %. Ag-Co alloy films having composition below 25 at. % Co showed mainly superparamagnetic behavior and above that composition, they showed both paramagnetic and ferromagnetic behavior in the as-deposited state. The maximum magnetoresistance of 19 % at R. T. and 10 kOe was obtained in the as-deposited 30 at. % Co alloy film. Heat treatment did not improve the MR ratio because most of the Co was already precipitated in the as-deposited state.
ESS 지/단락 실증시험에 기반한 BESS 고장모의 해석
김수열(Soo-Yeol Kim),임지훈(Ji-Hoon Im),이일용(Il-Yong Lee),김진태(Jin-Tae Kim),최인규(In-Kyu Choi),김형근(Hyeong-Geun Kim) 대한전기학회 2020 전기학회논문지 Vol.69 No.10
Battery ESS had been variously applied to power grid before recent ESS fires in Korea. An investigation committee was constituted to find fire causes and countermeasures to ESS fires. The investigation committee has identified top 4 causes for recent ESS fires as insufficient battery protection system against electric faults, incomplete system integration, inadequate management of operating environment, and careless installation. And recent 2nd investigation committee has presumed that battery abnormal condition was another reason for ESS fires. Battery protection system and system integration could be related with systematic issues such as insulation and protection coordination between PCS and battery system, information sharing and protection sequence. Manufactures made their best efforts to upgrade PCS and battery system by each, but had no much interest in the other subsystems of integrated system except their owns. Systematic analysis is very important to improve the reliability of ESS, which is combined by AC source and DC source via PCS. This paper reports system analysis results and suggests countermeasures against electrical faults, including simulation of ground fault and short fault, demonstration test result and systematic issues more than anything to solve for ESS business going forward.
이수열(Lee, Soo-Yeol) 한국해양대학교 국제해양문제연구소 2010 해양도시문화교섭학 Vol.- No.2
In modern times, Shanghai was the foreign metro city that most Japanese visited. This article thought about a meaning of Shanghai as the space of the cultural contacts through analyzing some modern Japanese literary works such as Muramatsu Shohu, Tanizaki Junichiro, Akutagawa Ryunosuke, Takeda Taijun, Hotta Yosie. To say conclusively, among the literary people who noticed Chinese political reality through service in a war and domiciliation with the people who visited Shanghai as a tourist based on exoticism, many differences were watched. The article thought about possibility of the de-nationalism by taking up diverse aspects of such cultural contacts.
이수열,Lee, Soo-Yeol 대한의용생체공학회 2009 의공학회지 Vol.30 No.1
Many types of small animal imaging modalities, like micro-CT, micro-PET, and micro-SPECT, have been recently developed worldwide. Small animal imaging systems are now recognized as indispensable tools to validate efficacy and safety of new drugs or new therapeutic methods using the animal disease models. With increasing demands for small animal imaging in biomedical research, multimodal small animal imaging systems, like micro-PET/CT or micro PET/MRI, are now also being developed. Small animal imaging with spatial resolution and sensitivity comparable to human imaging is quite challenging since laboratory small animals are much smaller than human beings. Research activities in Korea on small animal imaging systems are reviewed in this paper. In the field of micro-CT and micro-PET, many world-class technologies have been developed successfully in Korea. It is expected that the developed animal imaging system technologies can be used in the development of clinical imaging systems in Korea in the near future.