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다채널 적응 알고리즘을 이용한 잔향 음장에서의 능동소음제어에 관한 연구
김홍섭(H. S. Kim),손동구(D. G. Sohn),오재응(J. E. Oh) 한국자동차공학회 1995 한국 자동차공학회논문집 Vol.3 No.6
In this study, Active noise controlis implemented with single channel and multi-channel adaptive algorithm in 3 dimensional reverberant enclosure sound field, which occurrs in complicated acoustic mode. First, for the one case excited with the resonant frequency of an enclosure, a target of control and the other cases excited with band-pass filtered random noise(100~400Hz), it is implemented to control reducing interior noise of enclosure with single channel and real time multi -channel adaptive algorithm for global noise reduction in enclosure.
크루즈(Cruise)산업의 활성화를 위한 마케팅 전략에 관한 연구
김홍섭(H.S. Kim) 한국항만경제학회 2008 韓國港灣經濟學會誌 Vol.24 No.4
지난 수 십년간에 걸쳐 경제적인 발전과 소득의 증대로 크루즈에 대한 관심이 점차 증대 되어 오고 있다. 아시아지역에서 특히 크루즈 서비스에 대한 관심이 증대되어왔고 한국, 일본, 싱가포르, 홍콩, 대만, 중국 등에 두드러진 현상이다. 이 논문은 선행연구와 관련 문헌들을 조사, 분석하고 크루즈 산업의 특성과 개념을 분명히 한다. 이 논문의 목적은 크루즈 마케팅의 개념들을 탐구하여 분명히 하고 그 특성들을 조사하며, 한국에서의 크루즈 산업 현황과 추세를 조사하고자 한다. 그리고 4P의 관점에서 인천항의 크루즈 서비스의 실태와 문제점들을 참작하여 발전방향과 대안들을 모색하고 제시한다. The interest of Cruise has been increased because of economic development and income growth in the world during last several decades. In Asian area the Cruise service also has been enlarged, especially in East Asia countries such as Korea, Japan, Singapore, Hongkong, Taiwan and China. This paper reviewed previous researches and clarify its concept and characteristics of Cruise Industry. And This paper aims to study the correct concepts and characteristics of Cruise marketing and investigate the current status and trend of Cruise Industry of the world and Korea. And it has groped and suggested various countermeasures, strategies and tactics in the 4Ps perspectives, considering the problems and conditions of Cruise service of Incheon Port.
종횡비에 따른 Half Zone 유동의 진동현상에 대한 수치해석
김홍섭(H. S. Kim),이규정(K. J. Lee),양재경(J. K. Yang) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
A numerical study on the half-zone flow is performed to understand the characteristics of the oscillation of the flow with various aspect ratios. The steady and unsteady 2-dimensional program is developed and no surface deformation is considered. There is no devised disturbance to make the flow oscillate.<br/> As a result, aspect ratio increases with the critical temperature and decreases with the amplitude of the oscillation but it has less effect on the period of oscillation. At some cases, it is found that there is distorted, not sinusoidal one, oscillation at higher temperature difference.
김홍섭(H. S. Kim),손동구(D. G. Sohn),박수홍(S. H. Park),오재응(J. E. Oh) 한국자동차공학회 1997 한국 자동차공학회논문집 Vol.5 No.1
The need for an active exhaust noise controller has been growing as a reinforcement of exhaust noise regulation, high power output and improvement of average fuel economy.<br/> In this study, for development of this active exhaust noise controller. The implementation of a composition of realtime control algorithm for active exhaust noise control and the construction of simulator for active exhaust noise control has been investigated. Also, in order to implement active exhaust noise control with this simulator, the feasibilility model for control of vehicle exhaust noise control is suggested.<br/>
상용차 배기계에서 액티브 머플러를 이용하 배기 소음 제어
김홍섭(H. S. Kim),홍진석(J. S. Hong),오재응(J. E. Oh),송진호(J. H. Song) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.1
In this study, active muffler was designed and was manufactured for exhaust noise reduction of commercial vehicle, then experiment of real vehicle was conducted. In a manufactured active mufbecause the flow of exhaust noise in tail pipe outlet are become a plane wave, the global reof radiation noise from outlet and the placement of error microphone to avoid the exhaust gas of high temperature could be implemented. In control algorithm, reduction of noise of engine driving frequency and harmonic frequency can be archieved using the proposed reference signal including a fixed speed state(2,OOOrpm, 3,OOOrpm. 4,OOOrpm) and a run-up speed state(2,OOOrpm -4,OOOrpm) is accomplished with the active muffler installed in vehicle.<br/>
백홍규,조지현,김홍섭,박동철,유병연,박웅채,조형구 건국대학교 의과학연구소 1993 건국의과학학술지 Vol.3 No.-
Hydronephrosis, which is a common disorder of childhood, may be secondary to a number of abnormalities of the urinary tract. A kidney containing more than 1,000ml fluid in its collecting system is generally defined as giant hydronephrosis. The common clinical manifestations of giant hydronephrosis are abdominal distension and loin or abdominal pain. The patient seems to seek medical help late due to tolerable symptoms and particularly in the state of poor economic condition. We present a giant hydronephrosis of contents of 7,000ml associated with ureteropelvic junction stricture on a 8-year-old male. The final diagnosis was performed by exploration of abdomen and nephrectomy was done.