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손의 굽힘과 폄 동작 상상과 ERD(Event Related Desynchronization)/ERS(Event Related Synchronization)의 상관성에 관한 연구
박상인(Sang In Park),황민철(Min Cheol Whang),김종화(Jong Hwa Kim),김치중(Chi Jung Kim),안상민(Sang Min An),박재언(Jae Un Park),이정년(Jung Nyun Lee) 대한인간공학회 2010 대한인간공학회 학술대회논문집 Vol.2010 No.10
This study was to identify the possibility of proposing BCI (Brain Computer Interface) for the severely disabled. To do so, we tried to identify ERD and ERS caused by imagining hand movements: open and close the right hand. Five undergraduate and graduate students of Sangmyung University (male: 3, female: 2) participated in the experiment. Instructions for envisaging the hand movements were displayed on a 17 inch LCD monitor. The experimental sequences were designed as follows: rest time of 20 seconds was imposed before the task. Then, the tests were performed under two sets of conditions: 30 test and 10 training sessions. In each test and training session, 3 seconds and 5 seconds was assigned as stimulus and rest time respectively. ERD and ERS were extracted from the β(13-30㎐) and μ(8-12㎐) wave area under two different hand movements. A Mann Whitney U test was performed to identify significant difference between the two hand movements. As a result, a significant difference was observed between opening and closing the right hand (p < 0.05). The results imply that it is possible to utilize ERD and ERS signals for helping the disabled to interact with their environments. The proposed method is expected to be a framework in developing an interactive system for the disabled.
박상인 ( Sang In Park ) 한국산업조직학회 2010 産業組織硏究 Vol.18 No.3
최근 사회과학 제 분야에서 다항선택모형이 광범위하게 사용되고 있다. 본 논문은 다항선택모형의 방법론적 발전을 모형의 식별가능성과 추정 문제를 중심으로 재정리하여 논의하고자 한다. 구체적으로 본 논문에서는 (i) 관측되지 않은 대안 특성에 의한 내생성 문제, (ii) 가용한 자료 수준에 따른 식별가능성과 추정 문제, 그리고 (iii) 확률효용(random utility) 함수의 비모수적 식별가능성과 추정 등의 세가지 이슈들에 논의의 초점을 둔다. Since the seminal work of McFadden, the multinomial choice models have been extensively employed in empirical research. This paper provides a survey of the recent developments triggered by Berry, Levinsohn and Pakes (1995) in the identification and estimation of the multinomial choice model. Specifically the paper focuses on: (i) the endogeniety issue caused by an unobservable product (or choice) characteristic; (ii) the identification and estimation issues when only consumer-level or only aggregate-level data are available; and (iii) the nonparametric identification and estimation of the random utility function.
불평형 전압 발생 시 유효전력 조절을 통한 전압형 HVDC의 DC전압 제어 방안
박상인(Sang-In Park),허재선(Jae-Sun Huh),문원식(Won-Sik Moon),김두희(Doo-Hee Kim),김재철(Jae-Chul Kim) 대한전기학회 2015 전기학회논문지 Vol.64 No.2
Faced with unbalanced grid operation mode, the high voltage direct current (HVDC) based on voltage source converter (VSC) can be properly controlled by a dual current control scheme. For the modular multilevel converter (MMC) controlling the AC side current is able to limit the arm current which flows along the IGBT of submodule (SM) to rated current. However the limitation of the arm current results in leaving the control range of active power at MMC confined to below the rated capacity. As a result, limiting the arm current causes the problem that the DC side voltage of the HVDC can not be controlled to the reference value since MMC HVDC adjusts the DC side voltage through the active power. In this paper, we propose the algorithm adjusting the active powers of both MMCs to resolve the problem. The back-to-back MMC HVDC applying the algorithm is modeled by PSCAD/EMTDC to verify the algorithm.
박상인 ( Sang In Park ) 한국응용경제학회 2013 응용경제 Vol.15 No.2
시장경제체제에서 사회통합이 달성되기 위해서는 우선 시장경제체제의 근간이되는 법제도가 잘 확립되어야 하고, 시장실패의 보정과 불공정거래행위 방지라는 정부의 역할도 필요하다. 현대 시장경제체제의 근간이 되는 법제도로 사유재산권, 법치주의, 주식회사제도 등을 꼽을 수 있는데, 재벌에 의한 경제력 집중은 이런 시장경제체제의 근간이 되는 법제도를 무력화시키고 있다. 재벌세습과 재벌에 의한 경제력 집중의 해소는 경제민주화의 핵심적 내용이므로, 재벌개혁과 경제민주화는 시장경제체제 정립의 선결요건이라고 할 수 있다. 그러나 시장경제체제의 확립만으로 사회통합이 달성될 수 있는 것은 아니다. 공정한 경쟁의 패자에게도 최소한의 인간다운 생활을 보장할 수 있는 사회적 장치가 마련되어야만 사회통합이 이뤄지는 시장경제체제라고 할 수 있다. 사회통합이 담보된 시장경제체제만이 지속가능하고 시민의 참여와 지지를 받을 수 있으므로, 사회통합은 시장경제체제의 공공재라고 파악할 수 있다. For a well-functioning modern market economy system, the fundamental economic law and institutions, such as the property right law, the principle of the rule of law and corporation system, should be established along with the appropriate role of the government in the areas of antitrust and market failures. However, the existence of economic power by Chaebol incapacitates these fundamental economic law and institutions in the process of illegal and expedient Chaebol succession. Hence Chaebol reform is the key element of economic democratization which is the prerequisite for the establishment of the market economy system. In addition, for the social integration in the market economy, the social safety net and the welfare system should be installed to make sure that everyone in the system can live as a respected human being. Social integration may be considered a public good which makes the system sustainable and supported by the members of the society.
박상인(Sang-in Park),민승재(Seungjae Min) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
An optimum structural design methodology of magnetic actuators is proposed to achieve higher performance and lighter weight design. Level set method is introduced to represent boundaries between a ferromagnetic material domain and another domain filled with air. The optimization problem is formulated to maximize the magnetic energy of actuators under a minimum bound of material usages. The boundary shape of a structure is propagated by solving the level set equation of the initial value problem. The proposed method is applied to the structural design problem of magnetic actuators and verified.