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대호 (大湖) 저수지 (貯水池) 퇴적토의 (堆積土) 탈질화 (脫窒化) 세균과 탈질화 (脫窒化) 작용능에 미치는 환경요인
고유석,안태영 ( You Seak Go,Tae Young Ahn ) 한국하천호수학회 1992 생태와 환경 Vol.25 No.3
The denitrifying potential and various environmental factors were investigated and the influence of environmental factors on the distribution of denitrifying bacteria and potential was analyzed through stepwise multiple regression in the sediment of lake Daeho. The N_2O production was measured with gas chromatography at in situ temperature by acetylene blockage method and the N_2O production rates were 0∼9.18㎍-N/g-dw/day. The genera that showed denitrification potential were identified as Pseudomonas, Corynebacterium, Flavobacterium, etc. It was shown through statistical analysis that the environmental factors affecting the variation of denitrifying bacteria and potential differed with stations. NO_3 was used as a terminal electron acceptor, however terminal electron acceptor could be changed by environmental factors.
[차량운동성능부문] 차량 동역학을 고려한 차량용 댐퍼 해석 프로그램 개발
고유석(Yoyseok Koh),조길준(Giljoon Cho),심정수(Jeongsoo Shim) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The shock absorber is an important automotive part, which affect the comfort and the stability of the vehicle. In this paper, a physical model is developed to accuont for the nonlinear behavior of the auto-motive shock absorber. The quarter and half car models are constructed with the commercial GUI(Graphic User Interface) package. Instead of using a simple damper model with a damping coefficient, a shock absorber model which considers the compressibility of the oil and the variable gas phase in the shape of the bubbles, is linked with the vehicle model.<br/> Under the several driving conditions such as ride and steering motion, the internal architecture(valve parameters and hysterisis effects) of the damper and the vehicle motion are identified. This program can be applied to the design and the analysis of the various automotive shock absorber which affects the vehicle dynamics.
Suspension system과 Braking system을 이용한 UCC system 개발에 관한 연구
고유석(Youseok Kou),김완일(Wanil Kim),김동신(Dongshin Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Purpose of this work is for developing UCC system to enhance vehicle stability and driving comfort through vehicle test and computer simulation. The system characteristics of suspension control systems(CDC system for damping control and Rear Wheel Steering system for rear slip angle) are analyzed and that of ESP system is discussed for braking control system. The integrated control of the respective systems is applied to reduce the cost of the sensor and enhance the vehicle performance, This study will present the base of the development of UCC.
CDC 시스템의 Yaw 제어를 통한 UCC 시스템 구현
고유석(Y.S.Kou),두민수(J.W.Lee),김완섭(W.I.Kom),김완일(W.S.Kim),이정우(M.S.DOO) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
A vehicle suspension control system is newly evaluated in terms of enhancing vehicle stability and handling with braking control system CDC system is used to distribute the damping forces bet wren front and rear axles .which has effect on the vehicle yaw rate with ESP(Electric Stability Program), CDC system mitigates the over-steer and the under-steer tendencies during quick transient maneuver while ESP plays a same role in the unstable area of vehicle.<br/> Both systems can share control information through CAN and cooperate to achieve improved performance. The basic principle of system operation is explained based on CDC system, ESP and the vehicle dynamics. The computer simulation and the vehicle test result are presented to show the effect of damper setting on the vehicle characteristics and demonstrate the benefit of the proposed yaw control algorithm.
이일규,고유석,한석균,안태영 ( Il Gyu Lee,You Seok Go,Suk Kyun Han,Tae Young Ahn ) 한국환경생물학회 1995 환경생물 : 환경생물학회지 Vol.13 No.1
Limiting factors for the nitrogen fixation potentials by heterotrophic bacteria are not ammonia but carbon and phosphate. The nitrogen fixation potentials were investigated by acetylene reduction method that was added carbon, phosphate, and ions. The nitrogen fixation potentials ranged 0∼520.6μM-ethylene/L/day in Lake Soyang and 0∼615.3μM-ethylene/L/day in Daechung Reservoir. The nitrogen fixation potentials showed positive correlation with water temperature in Lake Soyang (r=0.75, P<0.01) and Daechung reservoir (r=0.71, P<0.01). As a result, the nitrogen fixation potential by heterotrophic bacteria were mainly affected by water temperature in Lake Soyang and Daechung reservoir.
전은형,고유석,한석균,안태영 ( Eun Hyoung Jeon,You Seak Go,Suk Kyun Han,Tae Young Ahn ) 한국하천호수학회 1997 생태와 환경 Vol.30 No.4
From September 1992 to August 1993, nitrogen assimilation and mineralization along with selected biological and physico-chemical environmental factors were investigated 9 times at two different stations in Lake Soyang. For the analysis of assimilation and mineralization, ion concentration analysis method was used. The range of nitrogen assimilation and mineralization rates were 0-100.6㎍-N L^-1 day^-1 and 0∼130.3㎍.-N L^-1 day^-1·respectively. At station 1. where was influent area, assimilation rate which was measured in the surface was correlated positively with temperature (r=0.82. p<0.01) and variation of ammonia (r=0.70, p<0.05) and it was correlated with chlorophyll-a (r=0.87, p<0.01) and nitrate (r= -0.75, p<0.05) in bottom against surface. At station 2, where was Joined with main and influent stream, assimilation rate in surface was correlated with temperature(r=0.77, p<0.05), pH (r=0.70,p<0.05) and ammonia (r=0.69, P<0.05) and mineralization rate in surface was positively correlated with temperature(r=0.86, p<0.01)and pH (r=0.84, p<0.01). Mineralization rate in bottom was correlated with N/P ratio (r=-0.67, p<0.05).