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김상훈(Sanghoon Kim),김덕호(Duck-Ho Kim),김준서(June-Seo Kim),문경웅(Kyoung-Woong Moon),이기석(Ki-Suk Lee),최석봉(Sug-Bong Choe),김갑진(Kab-Jin Kim) 한국자기학회 2018 韓國磁氣學會誌 Vol.28 No.2
We review here the recent progress on the study of the magnetization dynamics as well as the basic principle of the related phenomena. The static properties of the magnetic domain walls and skyrmions as well as their dynamic properties under application of magnetic field and/or spin current are discussed together with the Dzyaloshinskii-Moriya interaction. Finally, the basic principle and recent progress in the antiferromagnetic spintronics are introduced.
정보시스템 성과평가를 위한 형성적 구성변수(Constructs) 및 측정지표 개발
김상훈(Sanghoon KIm),김창규(Changkyu Kim) 한국IT서비스학회 2012 한국IT서비스학회지 Vol.11 No.4
Traditionally in IS studies, the relationship between construct and its measurement items tends to be assumed to be reflective, meaning that the measurements are a reflection of the construct. In reality. however, the nature of the construct can be often formative, which means that its measurement items describe and define the construct rather than vice versa. The purpose of this study was to investigate theoretical and empirically-analysed differences between formative construct and reflective construct through comprehensive interdisciplinary literature review. And then on the basis of these differences, we intended to derive the rule of specifying whether the construct is formative or reflective and propose the methodology of testing the validity(content validity, construct validity, internal consistency and external construct) of formative construct and its measurements, differentiated from that in the case of reflective construct. Also. we suggested the concrete statistical testing methods such as VTT(Vanishing Tetrad Test), MIMIC(Multiple Indicators and Multiple Causes) test and multi-collinearity test. In order to examine the applicability of this methodology to developing the constructs for performance evaluation of IS(Information Systems), we tried to identify its attribute(formative or reflective) and test the validity for the construct arbitrarily chosen among them which had been derived in our previous IS performance evaluation study by using this methodology. The result of the examination was that the methodology proposed in this study was significantly valid and effective in the area of IS performance evaluation.
조직간 정보시스템 통합을 위한 갈등관리모형 - 은행업종의 인수·합병을 중심으로 : 조직간 정보시스템 통합을 위한 갈등관리모형
김상훈(Sanghoon Kim),최점기(Jeomki Choi) 한국IT서비스학회 2006 한국IT서비스학회지 Vol.5 No.1
The main objectives of this study are (1) to identify the conflict types in IS integration process with respect to M&A, (2) to propose the ways to manage the origin of conflict to be expected, and (3) to develop the conflict management model which establishes the relationship among the M&A strategy, the IS integration strategy and change management process that influence the source of conflict. In order to achieve these research objectives, this study focuses on banking industry under M&A with the viewpoint of change management instead of existing technology-oriented IS integration strategy. The findings of this study are thought not only to be useful as a practical guideline in carrying out IS integration project under M&A but also to provide significant basis for constructing the theoretical framework of effective IS integration strategy.
김상훈(SangHoon Kim),류영석(YoungSuk Ryu),양성봉(SungBong Yang) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.2
P2P 웹 캐싱 기술은 자신의 로컬 캐시에서 원하는 웹 객체를 찾지 못한 경우, 중앙 서버나 프락시 서버로부터 웹 객체를 받기 전에 P2P 네트워크에 참여하는 이웃으로부터 웹 객체를 받음으로써 기존의 서버-클라이언트 방식을 탈피하여 중앙 서버의 고장에 영향을 적게 받고, 중앙 서버로의 과도한 부하를 막아준다. 기존의 많은 P2P 웹 캐싱 시스템은 피어의 로컬 캐시 교체 정책으로 LRU기법을 사용한다. 하지만 이는 P2P 환경을 고려하지 않는 단순한 정책이다. 따라서 본 논문에서는 P2P 환경을 고려한 디렉토리 기반의 웹 캐싱 시스템을 통해서 P2P 협력적인 캐시 교체 정책을 제시하고 실제 웹 로그 트레이스로 시뮬레이션을 하여, 제안하는 교체 정책이 효과가 있음을 기술한다.
정보화지원사업의 성과평가를 위한 이론적 모형 - 공공부문을 중심으로
김상훈(Sanghoon Kim),최점기(Jeomki Choi) 한국IT서비스학회 2007 한국IT서비스학회지 Vol.6 No.1
This study aims to construct the integrative performance evaluation model of informatization programs.<BR> In order to achieve the purpose of research, first of all, the three major theoretical paradigms (technical/functional, economic/financial, and interpretive/alternative paradigms) are comparatively analyzed concerning their philosophical and methodological perspectives. Also, a number of important studies and research model in the area of IS (Information Systems) evaluation are critically reviewed. And then actual problems and limitations on the process of implementing IS performance evaluation are sought through investigating domestic and foreign practices.<BR> Based upon theoretical and practical review of informatization evaluation and logical reasoning, the components of ideal performance evaluation scheme for informatization program are derived, and the integrative performance evaluation model which can comprehensively represent the relationship among the components is conceptually proposed.<BR> For researchers, this study provides the theoretical basis for reasonably deriving the performance variables of informatization programs and empirically validating the performance of managing informatization programs. And in real world, the results of this study are very likely to contribute to presenting the practical guideline for desirably implementing performance evaluation of informatization programs.
김상훈(Sanghoon Kim),윤웅섭(Woongsup Yoon) 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.5
대형로켓엔진의 시동, 정지, 추력 제어 알고리즘을 설계하고 이를 엔진모사 실험 장치에 모듈화 하여 목표 유량, 유량 비에 대해 타당성을 확인하였다. 엔진 모사 실험 장치는 펌프, 오리피스, 제어밸브, 파이프, 인젝터 및 재생 냉각채널로 구성하였고 제어 알고리즘은 제어 모드 별 실험을 통해 얻은 목표유량 밸브 개도와 PI제어를 통해 목표 유량 및 유량 비에 안정적으로 수렴하도록 설계하였다. 엔진모사 실험 장치 구성품 별 동특성 모델을 Simulink로 통합하고 제어 알고리즘을 모듈화 하여 시스템 동특성 예측 프로그램을 개발하였다. 유량 및 유량 비에 대한 제어모드 별 프로그램 예측 결과와 실험결과의 비교를 통해 엔진모사 실험 장치에 대한 시스템 동특성 예측 프로그램의 실용성을 확인하였다.