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.

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.

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.

IoT 기반 플랜트 안전관리시스템 현장 적용성 연구

박수열 ( Park Soo Yeol ),송병훈 ( Song Byung Hun ),강희철 ( Kang Hee Cheul ),이용환 ( Lee Yong Hwan ),여금수 ( Yeo Keum Soo ) 한국구조물진단유지관리공학회 2012 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.16 No.2

소동물 영상시스템의 국내 개발 현황

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.

美濃部達吉の法律観

李秀烈(Lee Soo-Yeol) 대한일어일문학회 2008 일어일문학 Vol.38 No.-

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.

토목구조물 모니터링을 위한 무선계측시스템 개발 및 실내외 검증 연구

박수열 ( Park Soo-yeol ),김준희 ( Kim Jun-hee ),이규완 ( Lee Kyu-wan ),최준성 ( Choi Jun-seong ) 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.1

Structural health monitoring systems are widely adopted to monitor the in-situ behavior of structure, to assess its performance under various loads, and to determine the structure’s condition. Thus the reliability of acquisition data plays a key role in managing of these systems. But conventional monitoring systems accompanying cable installations have indispensably the problems, such as involving electromagnetic noises and voltage drops. In this study, a new wireless sensing system consisting of remote sensors, A/D converters, and wireless communication controllers is developed and makes it possible to the multiplex communication and the low installation cost through eradication of extensive lengths of wires.

16세기 동아시아해역의 군수물자 유통-일본열도와 왜구-

이수열(Lee, Soo-Yeol) 한일관계사학회 2021 한일관계사연구 Vol.71 No.-

오늘날 일본 학계에서는 16세기 동아시아해역에서 활동하던 왜구를 ‘상업의 시대’의 한 주체로서 평가하는 것이 일반적이다. 이러한 왜구상의 변화를 초래한 배경에는 민족과 국가에서 벗어나 동아시아해역의 역사를 새로이 서술하려는 해양사관의 대두가 있다. 왜구는 ‘바다의 시좌’를 거치는 과정 속에서 종래의 폭력적인 침략자에서 동아시아해역의 교역자로 변모해갔다. 왜구를 국제상업의 교역자로 묘사하는 일본 학계의 평가는 중국이나 한국 사회의 일반적인 역사 인식과 커다란 괴리를 보이고 있다. 과연 16세기 동아시아해역은 일본 학계의 연구 성과가 밝히고 있는 것처럼 국가나 민족적 귀속이 애매한 ‘경계인’들의 활동 무대였을까? 16세기 왜구는 중국인이 다수였고, 일본은 단지 ‘근거지와 구성원을 제공하는’ 수동적인 위치에 머물렀을까? 이 논문은 왜구의 군수물자 유통, 그 중에서도 화기와 염초무역을 통해 16세기 왜구의 한 단면에 접근하고자 하는 것이다. 16세기 중엽에 시작된 지구적 차원의 은 순환은 동아시아해역의 물자와 사람의 흐름을 크게 바꿔놓았다. 상황 속에서 포르투갈이 들여온 신식 화기는 동아시아의 전통 화기를 대신하며 아시아사회에 군사혁명을 초래하는 계기가 되었다. 당시 내전 하에 있었던 일본은 포르투갈 상인을 통해 전래된 조총을 자체 생산하는 데 성공했지만, 화약 원료인 염초는 수입에 의존할 수밖에 없었다. 일본열도가 왜구 물자가 대량으로 거래되고 소비되는 일대 시장이 된 것은 그러한 이유에서였다. 논문에서는 동아시아해역의 군수물자 유통을 통해 16세기 왜구와 일본열도와의 관련성을 밝히고자 한다. Today, Japanese academia generally regards Waegu and Wako, who were active in the East Asian seas in the 16th century, as among the main traders in the "age of commerce." The background to such a change in the image of the Waegu is the rise of maritime history, which attempts to describe the history of the East Asian seas beyond ethnic groups and nations. In the process of going through "the perspective of the sea," Waegu changed from violent invaders to traders in East Asian seas. The evaluation of Japanese academia describing Waegu as traders of international commerce is very different from the general perception of history in Chinese society and Korean society. Were the East Asian seas in the 16th century the stage for the activities of "marginal men" whose national and ethnic attributes were ambiguous, as recent research by Japanese scholars revealed? The majority of Waegu in the 16th century were Chinese, and Japan was simply passive in providing bases and members. This paper focuses on the distribution of munitions by Waegu, especially in the trade of firearms and saltpeter. The global silver circulation, which began in the middle of the 16th century, greatly changed the flow of goods and people in the East Asian seas. Under these circumstances, Portugal"s new firearms replaced traditional East Asian firearms and triggered a military revolution in local communities. In the case of Japan, which was in a state of civil war at that time, they succeeded in domestically producing guns introduced through Portuguese merchants, though they had no choice but to import saltpeter, a raw material for gunpowder. This is why the Japanese archipelago became a large market where a large amount of Waegu goods were traded and consumed. This paper clarifies the relationship between the 16th century Waegu and the Japanese archipelago.

근대 일본의 상선 선원 : ‘고급’선원과 ‘보통’선원

이수열(Lee, Soo-Yeol),안미정(An, Mi-Jeong) 부산경남사학회 2021 역사와 경계 Vol.119 No.-

지금까지 일본 선원의 역사에 관한 연구는 해운경영사, 기업사, 노동운동사의 관점에서 이루어진 것이 대부분이었다. 이 가운데 선박노동자의 권리 투쟁을 주제로 하는 노동운동사를 제외하고 해운경영사나 기업사에서 선원은 관리나 경영의 대상‧객체로 그려지는 것이 일반적이었다. 선원을 한 묶음의 노동자 집단으로 다루는 노동운동사 또한 이 점에서 완전히 자유롭다고는 할 수 없다. 1980-90년대 전후부터 선원 관련 연구는 양적으로 감소하기 시작했다. 그 배경에는 선원의 ‘소멸’이라는 상황이 존재하고 있었다. 경영합리화를 이유로 일본인 선원의 감소, 바꿔 말하면 외국인 선원의 증가가 있었다. 이러한 상황 속에서 선원은, 외국인 선원이 여전히 다수 존재함에도 불구하고, 점차 연구자들의 문제관심 밖으로 밀려나게 되었다. 이 논문의 목적은 선원을 ‘고급’선원과 ‘보통’선원으로 구분하는 근대 일본의 이원적인 선원 정책을 그 양성 과정과 노동 현장의 실태를 통해 밝히고, 그러한 차별을 낳은 주된 원인으로서 국가의 해운 정책에 관해 살펴보는 것이다. 선원을 일컬어 하는 말 ‘바다의 囚人’에는 고립된 환경에서 고된 노동에 시달리는 육체적인 고통뿐만 아니라 선상에서의 차별적 대우도 포함되어 있었다. 선박 중앙부의 독실에 거주하는 고급선원과 파도소리가 진동하는 선수의 방 한 칸에서 공동생활을 하는 보통선원은 작업 환경이나 보수에서는 물론 식사에 이르기까지 모든 점에서 차이가 났다. 보통선원은 매 항해마다 고용되는 임시고용의 형태로, 직원록에도 실리지 않는 상태가 계속되었다. 단순히 업무상의 차이를 넘어 인격적인 차별로까지 이어지는 선원사회의 계급적 질서는 교육, 취업, 노동, 군복무, 퇴직 후에 이르기까지 거의 모든 과정에서 발견할 수 있다. 근대 일본에서 해운 확장은 국가의 팽창과 궤를 같이 하고 있었다. 국가는 선사에 보조금을 지급하고 항로 개설을 명령했다. 한편 선사는 정치권력과 결탁함으로써 비대해져갔다. 해운업은 국가의 대외 진출을 위해서는 없어서는 안 되는 기간산업이었다. ‘방선방인주의’는 이 기간산업에 대한 일본 정부의 기본 방침으로서, 그것은 해운이 갖는 군사적 성격에서 비롯하고 있을 뿐 아니라 당시 턱없이 높은 임금을 받았던 외국인 선원을 구축함으로써 해운 경쟁력을 확보하기 위한 정책이기도 했다. 고급선원의 양성은 방선방인주의를 달성하기 위한 필수불가결한 조건이었다. 그러나 보통선원 육성에 관해서는, 2차 대전 시 전사 선원을 메우기 위한 일시적인 경우를 제외하고는, 끝내 미온적인 태도로 일관했다. 이러한 근대 일본의 이원적 선원 정책이 고급선원과 보통선원 사이의 차별을 낳은 근본적인 이유였다. Until now, most of the research on the history of Japanese seafarers has been done in perspective of the history of shipping management or the history of the labor movement. Around the 1980s and 1990s, seafare research began to decline quantitatively. In the process of decreasing the number of Japanese seafarers due to rationalization of management, the seafarers gradually became out of the interest of researchers. The purpose of this paper is to identify modern Japan"s dualistic seafarers policy, which divides seafarers into "high-class" officers and "low-class" seamen, through its training process and labor conditions, and to examine the nation"s shipping policy as the main cause of such discrimination. The term "prisoner of the sea," which refers to seamen, includes not only physical suffering from hard labor in isolated conditions but also discriminatory treatment on board. High-class officers living in single rooms in the center of the ship and low-class seamen living together in a single room where the sound of waves vibrated differed in every way, from working conditions to meals. Low-class seamen are employed on every voyage in the form of temporary employment, which is not even on the employee list. This hierarchical order of seafarers society can be found in almost every process, from education, employment, labor, military service, to post-retirement. In modern Japan, shipping expansion was in line with national expansion. The state subsidized shipping companies and ordered them to open routes. Meanwhile, the shipping company has become bloated by colluding with politics. The shipping industry was an indispensable key industry for the country"s entry into foreign markets. Training high-class officers was an indispensable condition for achieving shipping independence. However, when it comes to low-class seamen, they have remained lukewarm in the end. This dualistic seafarers policy of the Japanese government was the fundamental reason for the discrimination between high-class officers and low-class seamen.