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일부 농촌지역에서 뇌졸중의 위험요인에 관한 연구 -환자 대조군 연구-
한성현,이성수,Han, Sung-Hyun,Lee, Sung-Soo 대한예방의학회 1988 Journal of Preventive Medicine and Public Health Vol.21 No.1
The main objectives of this study were to know the prevalence of cerebrovascular diseases, to find the important risk factors of cerebrovascular diseases. This study is a part of Eumseong Community Health Project supportes by GTZ(West German Goverment). 116 perceived cases of cerebrovascular diseases were first screened by health interview and examinations and 80 cases were diagnosed as a cerebrovascular group. For comparison, 80 cases were matched with their neighbor controls of the same sex and the similar age. 1. The prevalence rate for cerebrovascular diseases was 476.3 per 100,000 population which is considered to be very high compared with that of other countries. Age adjusted rate for cerebrovascular diseases was 261.6 per 100,000. 2. Among the risk factors examined for the association with cerebrovascular diseases by case-control study, and analysed by paired marginal test(McNemar's $X^2$-test) and odds ratio, only hypertension showed high significant statistical association.
한성현(Sung-Hyun Han),김윤구(Wn-Goo Kim),Le Xuan Thu,신행봉(Haeng-Bong Shin),김원일(Won-il kim),조창제(Chang-jae Cho) 한국기계가공학회 2006 한국기계가공학회 춘추계학술대회 논문집 Vol.2006 No.-
The wavelet transform is a popular tool for studying intermittent and localized phenomena in signals. In this study the wavelet transform of cutting force signals was conducted for the detection of a tool failure in turning process. We used the Daubechies wavelet analyzing function to detect a sudden change in cutting signal level. A preliminary stepped workpiece which had intentionally a hard condition was cut by the inserted cermet tool and a tool dynamometer obtained cutting force signals. From the results of the wavelet transform, the obtained signals were divided into approximation terms and detailed terms.
한성현(Sung-Hyun Han) 한국컴퓨터정보학회 2008 韓國컴퓨터情報學會論文誌 Vol.13 No.5
최근 교육 분야에서 e-포트폴리오가 각광을 받고 있으며 많은 교육 기관들이 e-포트폴리오 시스템을 연구, 사용, 도입하고 있다. e-포트폴리오의 장점에도 불구하고 문제점도 존재한다. 본 논문에서는 기존의 e-포트폴리오 관리시스템의 문제점을 분석하고 이를 극복할 수 있는 새로운 e-포트폴리오 관리시스템을 제안하고 구현한다. 제안한 e-포트폴리오 관리시스템은 다른 사람들과 경쟁하는 구조로 되어 있다. 모든 학생들의 활동은 블로그와 같은 환경에서 추천과 상호 참여를 유발하도록 구현하였다. In recent years, e-portfolios and webfolios have been highly vaunted as the next great innovation in education. Hundreds of academic institutions are variously studying, using, or innovating e-portfolio systems. Despite the presumed goodness of e-portfolios, some problems remain. In this paper we review the existing e-portfolio management systems, and propose and implement a novel system to overcome the limits of the existing e-portfolio management systems. The propose e-portfolio management system has a structure of competition with others. All of the student's activities are accomplished and preserved within the same personal web space like a blog with mutual engagements and recommendations.
직접 적응제어방식에 의한 로봇 머니퓰레이터의 견실한 제어기 설계에 관한 연구
한성현(Sung-Hyun Han),박한일(Han-Ill Pak) 한국해양공학회 1989 韓國海洋工學會誌 Vol.3 No.2
This paper deals with the robust controller design of robot manipulator to track a desired trajectory in spite of the presence of unmodelled dynamics in cause of nonlinearity and parameter uncertainty. The approach followed in this paper is based on model reference adaptive control technique and convergence on hyperstability theory but it does away with the assumption that process is characterized by a linear model remaining time invariant during adaptation process. The performance of controller is demonstrated by computed simulation about position and speed control of six link manipulator in case of disturbance and payload variation.
한성현 ( Sung-hyun Han ) 한국고등직업교육학회 2003 한국고등직업교육학회논문집 Vol.4 No.4
This paper presents a new anti-copying methode for color documents. The approach protects the document and its content from unauthorized copying and forgeries, while using ordinary paper and ordinary printer. The paper copy is protected against copying as the photocopy version will appear differently when compared to the authorized printed original hard copy. The anti-copying pattern created through pointillism with a halftone cell and a spot. The proposed method is useful for unauthorized copying and forgeries with high-resolution scanners and photocopiers.
한성현(Sung-Hyun Han),신행봉(Haeng-Bong Shin),Le Xuan Thu,안종국(Jong-Kug An) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
We propose a new technique to the development of Intelligent control algorithm based-on digital signal processors in order to improve the precision and robustness for system of industrial robot. Intelligent control has emerged as one of the most active and fruitful areas for research in the applications of fuzzy set theory, especially in the real of industrial processes. In this thesis, a self-organizing fuzzy controller for the industrial robot manipulator with a actuator located at the base is studied. A fuzzy logic composed of linguistic conditional statements is employed by defining the relations of input-output variable of the controller, In the synthesis, one of the most difficult problems is the determination of linguistic control rules from the human operators. To overcome this difficult, SOFC is proposed for a hierarchical control structure consisting of basic level and high level that modify control rules. The proposed scheme is simple in structure, fast in computation, and suitable for implementation of real-time control. Performance is illustrated by simulation and experimental results for SCARA robot.