전력계통의 중성선에 적용된 초전도한류기의 대칭고장전류 저감방안 분석

임성훈,Lim, Sung-Hun 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.2

The superconducting fault current limiter (SFCL) applied into the neural line of a power system, which can limit the unsymmetrical fault current from the single-line ground fault or the double-line ground fault, was reported to be the effective application location of the SFCL in a power system. However, the limiting operation for the symmetrical fault current like the triple line-ground fault is not effective because of properties of the balanced three-phase system. In this paper, the limiting method of the symmetrical fault current in a power system with a SFCL applied into neutral line was suggested. Through the short-circuit experiments of the three-phase fault types for the suggested method, the fault current limiting and recovery characteristics of the SFCL in the neutral line were analyzed and the effectiveness of the suggested method was described.

자속구속형 고온초전도 사고전류 제한기의 사고제거 후 회복특성

임성훈,Lim, Sung-Hun 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.9

To apply the superconducting fault current limiter(SFCL) into a power system, the analysis for its recovery characteristics as well as the consideration for its cooperation with other protecting machine such as a circuit breaker is required. The recovery characteristics of the flux-lock type SFCL like its current limiting characteristics are dependent on the winding direction of two coils. In this paper, the experiments of the current limiting and the recovery characteristics of the flux-lock type SFCL with YBCO thin film were performed. From the analysis on the experimental results due to the winding direction of two coils, the limited fault current in case of the additive polarity winding was observed to be lower than that for the case of the subtractive polarity winding. In addition, the recovery time was found to be faster in case of the additive polarity winding compared to the subtractive polarity winding.

히스테리시스 특성을 고려한 자속구속형 고온초전도 사고전류 제한기의 사고전류 제한특성 분석

임성훈,최명호,Lim, Sung-Hun,Choi, Myoung-Ho 한국조명전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.2

자속구속형 초전도 사고전류 제한기는 평상시 자기적인 결합에 의해 철심의 히스테리시스 손실이 발생하지 않는 특징이 있다. 그러나 사고시에는 사고전류증가로 인해 고온초전도 소자의 저항발생과 함께 철심의 포화가 발생할 경우 제한기의 사고전류제한 특성을 저하시키는 현상이 발생하게 된다. 따라서 본 논문에서는 이를 분석하고 억제하기 위한 설계방안을 도출하기 위해 자속구속형 고온초전도 사고전류 제한기의 구성요소인 자속구속 리액터의 히스테리시스 특성을 고려한 사고전류 제한특성을 분석하였다. 이를 위해 제한기의 등가회로와 사고전류 제한실험으로부터 히스테리시스 곡선을 도출하였다. 1, 2차권선의 인덕턴스 비에 따른 히스테리시스 곡선으로부터 인덕턴스비가 증가함에 따라 제한되는 사고전류크기는 증가한 반면 사고시 자속구속형 사고전류제한기의 구성요소인 철심의 포화가 억제됨을 확인할 수 있었다. The fault current limiting characteristics of a flux-lock type superconducting fault current limiter (SFCL) considering hysteresis characteristics of a flux-lock reactor, which is an essential component of the flux-lock type SFCL, were investigated. In the normal state, the hysteresis loss of iron core in the flux-lock type SFCL does not happen due to its winding's structure. From the equivalent circuit for the flux-lock type SFCL and the fault current limiting experiments, the hysteresis curves could be drawn. Through the hysteresis curves together with the fault current level due to the inductance ratio between the primary and the secondary windings, the increase of the number of turns in the secondary winding of the flux-lock type SFCL made the fault current level increase. On the other hand, the saturation of iron core was prevented.

철심의 자화특성을 고려한 자속구속형 초전도 사고전류제한기의 특성 분석

임성훈,Lim, Sung-Hun 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.11

We investigated the characteristics of a flux-lock type superconducting fault current limiter(SFCL) considering magnetization characteristic of iron core. The flux-lock type SFCL, like other types of SFCLs using the iron core, undergoes the saturation of the iron core during the initial fault time. Therefore, if the design to prevent the saturation of the iron core is considered, the effective fault current limiting operation can be achieved. Through the analysis for its equivalent circuit including the magnetization characteristic of the iron core, the limiting impedance of the flux-lock type SFCL was drawn. The magnetization currents and the limited currents of SFCL, which were dependent on the winding direction and the turns' ratio between two coils, were investigated from the short circuit experiment. It was confirmed that their experimental results agreed with the analysis ones.

열처리조건이 초전도벌크의 임계특성에 미치는 영향

임성훈,한태희,박경국,조동언,이중근,한병성 ( Sung Hun Lim,Tae Hee Han,Kyung Kuk Park,Dong Eon Cho,Jung Kun Lee,Byung Sung Han ) 한국전기전자재료학회 1997 한국전기전자재료학회 추계학술대회논문집 Vol.1997 No.1

션트리액터의 자기결합을 이용한 초전도전류제한기를 구성하는 초전도소자들의 전력부담 분석

임성훈,Lim, Sung-Hun 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.1

The power burden of high-$T_c$ superconducting (HTSC) elements comprising superconducting fault current limiter (SFCL) using magnetic coupling of shunt reactors was analyzed. The magnetically coupled shunt reactors play a role in distributing the even power burden between HTSC elements comprising the SFCL, which contributes to the effective current limiting and recovery characteristics of the SFCL. It was confirmed through the comparative analysis on the SFCLs with both the magnetically coupled and the magnetically uncoupled shunt reactors that the magnetically coupled shunt reactors could improve the SFCL's performance by equalizing the power burden of HTSC elements.

헬스케어산업 관점에서 본 린스타트업 적용 사례연구: (주)휴메딕스 사례를 중심으로

임성훈,김용태,Lim, Sung-Hoon,Kim, Yong-Tae 한국벤처창업학회 2015 벤처창업연구 Vol.10 No.3

최근 해외뿐만 아니라 국내에서도 헬스케어 산업에 대한 투자가 지속적으로 증가하고 있다. 그러나 시간과 비용이 많이 들어가는 헬스케어 산업의 특성은 창업 활성화 및 투자에 제약이 되고 있다. 이 때문에 IT산업 분야의 스타트업 기업에 적용되어 효용성을 인정받고 있는 린스타트업 방법론이 헬스케어 산업 분야의 스타트업에도 적용 가능한지를 살펴보는 것은 중요한 의미를 갖는다고 하겠다. 본 연구에서는 헬스케어 산업분야에서 기술력을 바탕으로 창업하여 벤처캐피탈 투자유치 및 코스닥 상장까지 이룬 기업의 사례를 통해서 IT 산업분야 초기 창업기업에 적용되어 왔던 린스타트업(Lean Startup)이론의 응용 가능성을 모색하고자 하였다. 헬스케어 산업분야의 특성 및 린스타트업 관점의 접근을 통한 사례연구의 함의는 다음과 같다. 첫째, 시제품의 테스트가 법으로 엄격히 규제되어 있는 헬스케어 산업분야의 기술창업일수록 린스타트업 이론에 의한 최소요건제품(MVP, Minimum Viable Product) 개발을 통한 가설검증이 중요하다. 둘째, 헬스케어 산업과 같이 전임상(pre-clinical study), 임상 시험 등 인허가 과정이 길고, 비용이 많이 들어가는 산업일수록 연구조직을 스타트업(Startup) 조직으로 구성하고 연구원의 기업가정신(Entrepreneurship)을 함양해야 된다. 셋째, 젊은 엔지니어의 기술창업을 활성화하기 위해서는 기업가정신 함양과 같은 응용인문학 교육과 더불어 린 스타트업과 같은 스타트업을 위한 차별화된 경영기법이 요구된다. The investment in healthcare industry has recently increased not only for global ventures but also for the domestic ventures. However, there has been hardship of founding and investment caused by healthcare startups characteristics that are costly and time consuming. In this study, the applicability of 'Lean Startup' theory to healthcare ventures was explored through the case of a domestic startup which accomplished funding from VC and KOSDAQ after establishing based on its technology in healthcare industry. There have been numerous case studies that applied 'Lean Startup' to IT industry. However, this case study that applied 'Lean Startup' to healthcare industry have some implications as follow: First, it is critical to conduct a hypothesis testing at initial research stage through R&D of 'MVP' (Minimum Viable Product) as the prototype testing is strictly prohibited in healthcare industry. Second, healthcare R&D teams ought to be well organized as startup teams and all researchers should be equipped with entrepreneurship as the licensing process in healthcare industry is time-consuming and costly due to issues like clinical studies. Lastly, management skills as smart and light as 'Lean Startup' are required in order to encourage young engineers' technology startups.

도시미화와 예술: '길 위의 예술'에 대한 비판적 소고

임성훈,Lim, Seong-Hoon 한국미술이론학회 2010 미술이론과 현장 Vol.10 No.-

What is Art on the street? Is it a series of artworks or activities performed on the street? In other words, does "art on the street" refer to "Street Art" such as street performance, happening, graffiti, or wall-painting, or does it refer to "Street Furniture" which is related to "City Design" or "Environmental Design"? In a formal sense, they all belong to Art on the street. However, in this paper, I would like to use Art on the street in an even broader sense. To me, " the street" is a metaphor of "environment." Thus Art on the street is the art related to environment; it is an environment art. Art on the street attests the expansion of the concept of art and shows a new possibility of contemporary art. It is a promising new concept of art, but we cannot ignore the misapplication of the concept that we can find at the crossroad of Art on the street and "city beautification." Of course, Art on the street can and sometimes needs to beautify the city. However we still need to ask how to contribute to the city beautification with Art on the street and how to validate such a practice. City space is, most of all, a space that people live in. It sounds a cliche, but it is worth repeating to better understand Art on the street. When we consider the city space in terms of its system or organization, we often overlook that it is the space in which people live, and which people create. Art on the street concerns not the city itself, but the space in which people live and make relations for each other. Without taking this into account, Art on the street becomes a mere means to' embellish' the city and falls prey to the logic of capital. In this paper, I critically reviewed the problems such as City Development, Spectacularization, City Environmental Design, Public Interest and City Museum. I intended to emphasize that Art on the street is produced in the cultural space of city, but it also tends to break the mold of the cultural space and seeks a new possibility. Some might argue that my claims are unrealistic because Art on the street is not an idea but a practice. While humbly accepting the objection, I hope my critical suggestions guide a more productive direction to continue our discussions of Art on the street.

무기체계의 효과분석과 의사결정을 위한 다기준분석 방법론의 연구

임성훈,조기홍,박승,Lim, Sung-Hoon,Cho, Ki-Hong,Park, Seung 한국군사과학기술학회 2009 한국군사과학기술학회지 Vol.12 No.5

Weapon system currently considers the research about effect analysis including cost effectiveness methodology for a budget management and an achievement of the military strategy goal. So that, this study considers the theoretical background, strength and weakness of several Multi-Criteria Decision Making, and an effect analysis of weapon system. And AHP(Analytic Hierarchy Process) is selected for the best effect analysis methodology of weapon system. Therefore, we applied AHP to the case study of the new generation Multiple Launcher Rocket System, performing the analysis of cost effectiveness methodology. Using AHP and cost effectiveness methodology, we propose the actual and proper decision making result.

두 개의 자기경로 철심을 갖는 코일의 자기결합을 이용한 초전도 전류제한기의 히스테리시스 특성

임성훈,Lim, Sung-Hun 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.12

The iron core, which comprises the superconducting fault current limiter (SFCL) using magnetic coupling of coils, can be operated in the saturation region, especially at the initial fault period. This operation of the iron core in the saturation region deteriorates the fault current limiting operation of the SFCL. To solve the saturation problem of the SFCL using magnetic coupling of coils, the iron core with two magnetic paths, which has an air-gap in one of them, was adopted. In this paper, the hysteresis characteristics of SFCL using magnetic coupling of coils, which were wound in the iron core with two magnetic paths, were analyzed. Through comparative analysis on the hysteresis characteristics of the iron core comprising SFCL, the hysteresis characteristics of the iron core with two magnetic paths were confirmed to be kept in the non-saturation region during the fault period and thus, the effective fault current limiting operation of the SFCL using the magnetic coupling of coils could be performed.