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구조 가진과 음향 가진의 결합에 의한 차량의 구조-음향 전달 함수 측정
고강호(Kang-Ho Ko),이장무(Jang-Moo Lee) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.9
In this paper a simple measurement technique for mechanical-acoustic transfer functions is proposed. The mechanical-acoustic transfer functions, generally, are measured through mechanical excitations: impact hammers or shakers. Recently, by virtue of vibro-acoustical reciprocity principle, they are measured through acoustic excitations: loudspeakers. This kind of test needs to measure the volume velocity, the radiation characteristics of a sound source. Because the volume velocity of the sound source is changed by driving signal, it is difficult to measure it. However, the new method in this paper needs not to measure the volume velocity of a sound source by combination of mechanical and acoustic excitations. Moreover, this method has the methodological advantages, such as usage of a general loudspeaker for the reciprocal excitation, no spatial limitations for measurements of mechanical-acoustic transfer functions.
고강호(Kang-Ho Ko),국형식(Hyungseok Kook),이재형(Jaehyung Lee) 한국자동차공학회 2002 한국 자동차공학회논문집 Vol.10 No.1
In order to reduce the booming noise caused by first bending mode of a drive shaft, this paper proposes a simulation program for prediction of the bending mode frequency of any tubular shaft. This program consists of a pre-processor for modeling of geometrical shape of the drive shaft with boundary conditions of various joints, a processor for constructing of global finite element matrices using beam elements and an eigen-solver based on MATLAB program. Using this simulation program, the effective and accurate FE model for a shaft attached to vehicle can be obtained by aid of database for stiffness of each joint. Thus the resonance frequencies and mode shapes of a shaft can be calculated accurately. Because the effect of the resonance on interior noise can be verified, more improved shaft will be proposed at the early stage of design.
가정폭력피해자 집단에 대한 사이코드라마 경험에 관한 연구
고강호 ( Ko Kang-ho ) 한국사이코드라마.소시오드라마학회 2005 한국사이코드라마학회지 Vol.8 No.2
본 연구는 실존적-현상학적 방법을 통한 사이코드라마 경험에 관한 연구이다. 이를 위하여 가정폭력피해자 10명을 대상으로 사이코드라마를 실시하고 실존적-현상학적 면접을 실시 하였다. 자료를 분석한 결과 19개의 공통주제가 나타났는데 사이코드라마 경험 전에는 불안과 두려움, 신체화 경향 등을 표현했고 긍정적인 반응으로는 호기심과 기대감을 나타냈다. 사이코드라마 경험 중에는 깊은 정서적 몰입, 강한 정서의 표현, 탈진감과 피로감을 경험했으며 자신감이 생겼다고 하였다. 사이코드라마 경험 후에는 신체적으로 가벼움과 해방감, 통찰의 경험을 했다. 가정폭력 피해자들이 도움 받은 것으로 지각한 치료적 요인으로는 실존적 요인, 집단응집성, 보편성, 자기이해, 정화, 대인관계학습 순이었다. 이러한 결과는 앞으로 외상으로 고통을 받는 피해자 집단에게 사이코드라마가 적절하게 활용될 수 있음을 보여주고 있다. This study was a qualitative study to analyze the meanings of experience in psychodrama for victims of domestic violence. For this, existential - phenomenological interview was administered to 10 participants who had experienced in psychodrama. As a result, 19 common themes was acquired by experience in three periods (before, mid, after) and Investigation was made in terms of the order of Therapeutic factors. Participants reported sense of anxious, fearfulness, and somatization and reported sense of curiosity and anticipation in affirmative before psychodrama. In the middle of psychodrama, Participants experienced emotional absorption, expression of strong emotions, emotional and physical burnouts, prostrate and fatigue, and later assurance. After psychodrama, Participants reported physically refreshed and freedom and insight. The therapeutic factors rated important by victims of domestic violence were existential factor, group cohesiveness, universality, self-understand, catharsis, interpersonal learning.
입력성형기법 적용을 통한 머시닝센터의 가공 정밀도 개선에 관한 연구
고강호(Kang-Ho Ko),임동욱(Dong-Wook Lim),홍성욱(Seong-Wook Hong) 한국생산제조학회 2023 한국생산제조학회지 Vol.32 No.4
Recently, machining centers have been actively adopting high-speed positioning systems to enhance operational efficiency and productivity. This study focuses on applying input shaping techniques to a machining center to improve the machining precision. Simulations were performed using a minimal impulse input shaper on a two-axis stage, considering its anisotropic characteristics. A comparative analysis was performed to assess the effectiveness of input shaping by varying the material, feed rate, reduction ratio, and depth of cut. The machined specimens were measured using a digital microscope, surface roughness tester, and an image dimension measurement device. Successful experiments were conducted to demonstrate the improved processing quality of the machining center during combined linear and circular cutting processes. Both the simulations and experiments confirmed the significant effectiveness of the proposed method in enhancing the machining precision of the machining center.
[연료 및 윤활유부문] 타이어 공동의 공명이 차량 실내 소음에 미치는 영향
고강호(Kang-ho Ko) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Vibration transmitted through tires due to forces generated by the road-tire interaction is an importance source of<br/> road noise in vehicle interior over a low frequency range. Especially, the vibration resulting from acoustic cavity resonance of tire results in vehicle interior noise through the structure-borne noise path. In this study, peak of this road noise from the cavity resonance was eliminated by filling the tire cavity with porous polyester. Because this polyester material has an effect on increasing of acoustic damping of cavity, resonance phenomenon can be removed in tire cavity filled with polyester. Also. cavity resonance frequency of tire is measured through the point inertance using impact hammer and accelerometer instead of acoustic excitation using loudspeaker and microphone<br/>