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황규혁,김광일,송수식 대한신경정신의학회 1988 신경정신의학 Vol.27 No.1
The authors attemped to identify lay people’ s attitudes toward illness behavior for the purpose of providing available materials for understanding the patients’ medical behavior and planning the effective health care system. For this study Q-methodology was used, and the 40 statements were Q-sorted by 30 males and 32 females of various backgrounds. The 40 statements consist of opinions and attitudes toward the concept of disease, the cause of disease, the choice of treatment, belief in modem medicine, social and traditional values, health care system, the view of life and religion. The data were statistically treated by Q factor analysis and 5 characteristic factors were duly extracted. The characteristic features of each factor were as follows : Factor A : The subjects of this factor have optimistic attitude toward the development of science and have a preference for the modem medicine, and seem to want unitary health care system. They are mostly highly educated. These people were named as The Modern Medicine Followers. Factor B : The subjects of this factor believe the modem medicine, at the same time have a preference for the folk therapy and Han BangCherb medicine). They firmly oppose the religious therapy and have conservative attitude toward the society. They are mostly non-religious people. The Folk-Oriented People is probable name. Factor C * These persons have no confidence on the modem medicine, also have no specific preference for a certain therapy and accept all therapeutic regimens. They assert pluralistic health care system. The majority of theses persons were young people. The name of The Syncretic People is mostly suitable. Factor D : The subjects of this factor have firmly negative attitude toward modem medicine and depend on the other people s experience or opinion. Their view of life may be continent and pessimistic. The Modern Medicine Negativist is labled on this factor. F a c to r E : T h e s e s people have no co n fid en ce on th e m o d em m e d icin e an d o rie n te d to H an Bang, folk therapy and religious therapy. They emphasis religion and assert the pluralistic health care system. The majority of theses people have religion. The name of The Religious is suitable. A Prominant finding is that all factors except factor A have a preference for various therapeutic regimens including Han Bang, folk therapy and pharmacy medication
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GaN증폭기의 본드 와이어 용융단선 현상분석과과도전류를 고려한 전류용량 선정에 대한 연구
유우성,석연수,황규혁,김기준 한국전기전자학회 2022 전기전자학회논문지 Vol.26 No.4
This paper analyzes the occurrence and cause of bond wires fusing used in the manufacture of pulsed highpower amplifiers. Recently GaN HEMT has been spotlight in the fields of electronic warfare, radar, base stationand satellite communication. In order to produce the maximum output power, which is the main performance ofthe high-power amplifier, optimal impedance matching is required. And the material, diameter and number ofbond wires must be determined in consideration of not only the rated current but also the heat generated by thetransient current. In particular, it was confirmed that compound semiconductor with a wide energy band gap suchas GaN trigger fusing of the bond wire due to an increase in thermal resistance when the design efficiency is lowor the heat dissipation is insufficient. This data has been simulated for exothermic conditions, and it is expectedto be used as a reference for applications using GaN devices as verified through IR microscope. 본 논문은 최근 전자전, 레이더, 기지국 및 위성통신분야에서 각광받고 있는 GaN HEMT(Gallium Nitride High ElectronMobility Transistor) die를 이용한 고출력증폭기의 제작에 사용되는 본드 와이어의 용융단선 현상과 원인을 분석하였다. 고출력증폭기의 주요 성능인 최대 출력전력을 얻기 위해서는 최적의 임피던스 정합이 필요하고 정격전류뿐만 아니라 과도전류에 대한 발열을 고려하여 본드 와이어 소재에 부합하는 직경과 가닥수가 정해져야 한다. 특히, GaN과 같이 에너지 밴드 갭이 넓은 화합물반도체는 설계효율이 낮거나 방열이 부족하면 열 저항 증가로 인해 본드 와이어의 용융단선을 촉발하는 현상을 확인하였다. 본 자료는 발열조건에 대한 모의시험을 수행하고, IR현미경 측정을 통한 검증으로 GaN소자를 이용한 응용분야에 참고자료로 활용이 기대된다.
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임헌영(H. Y. Lim),심재경(J. K. Shim),황규혁(K. H. Hwang) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
Biped robot has better mobility than other mobile robot, but it is hard to maintain balance during walking. In order to maintain balance, stability analysis is a key point for a biped robot. The zero moment point analysis has been used most in stability analysis. In this paper, we propose different method of stability analysis using wrench system. It is possible to generate a wrench system by applying a force along an axis in space and simultaneously applying a moment about the same axis. Wrench system is equivalent to a force and moment applied along the same axis. We compare the result of wrench system analysis with that of zero moment analysis in biped robot stability using simulation program.
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