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송현수(Hyunsoo Song),권동수(Mun Sang Kim),김문상(Dong-Soo Kwon) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
This paper describes a novel expression method of service robots according to the principles of traditional animation. Conventional issues to control robots are accuracy and speediness. Robots as machines in factories have to move fast and operate efficiently. However robots have come into human's living space as service robots, lifelike expression is emerging an important issue in a robotics field. The principles of traditional animation are useful methods to make characters living things in cartoon animations. We have tried to make robots more lifelike with animation principles. Three factors of the animation principles are applied into a robot's walking expression: anticipation, secondary action and follow-through. These principles help robots to look more lifelike by changing feelings of weight and speed, important factors of lifelike expression. According to the user test, anticipation and follow-through affect feeling of speed, and secondary action changes feeling of weight.
고속응답 CO₂ 분석기의 제작 및 이를 이용한 SI 엔진에서의 실시간 배기가스 분석에 관한 연구
송현수(Hyunsoo Song),민경덕(Kyoungdoug Min) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
A fast response CO₂ analyzer has been developed for measuring the CO₂ concentration during transient condition of SI engine. The analyzer is based on the non-dispersive infrared absorption technique, electrical chopping system and water cooling system. The analyzer has good repeatability, linearity and permissible drift characteristic. Besides, it has 18ms with a response to measure the CO₂ concentration. The fast response CO₂ analyzer was applied to single cylinder SI engine and the CO₂ emission was examined during engine start. Simultaneously, the standard exhaust gas analyzer, which has slow response time, was used for considering the engine-out CO₂ characteristic. The developed analyzer showed much faster responsive characteristic than that of a standard analyzer and made cycle by cycle exhaust gas analysis possible. The transient engine operating characteristics will be estimated and the transient behaviors on engine-out emission and performance will be improved.
접촉각과 가열이 증발 액적 내 입자 분리에 미치는 효과
송현수(Hyunsoo Song),유정열(Jung Yul Yoo) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Micro-particle separation has been applied to various fields such as microfluidics, microbiology, pharmacy, and chemistry for a long time. In this study, we propose a novel technique which can separate di-disperse particles of different densities in a sessile drop, by using “Coffee Stain Effect” and “Cheerios Effect”. The temperature and contact angle are the major factors which determine the evaporation mode of a drop, so that the experiments are conducted for various wettability conditions with and without heating. As a result, by analyzing the distribution of particles in a dried drop quantitatively, it is revealed that the particles can be separated efficiently at room temperature and small contact angles.
고속응답 CO₂ 분석기의 제작 및 이를 이용한 SI 엔진에서의 실시간 배기가스 분석에 관한 연구
송현수(Hyunsoo Song),박경석(Kyoungseok Park),박동선(Dong Sun Park),민경덕(Kyoungdoug Min) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.2
A fast-response CO₂ analyzer has been developed for measuring the CO₂ concentration during transient condition of a SI engine. The analyzer consists of the non-dispersive infrared absorption method, electrical chopping system and water cooling system. The analyzer has good repeatability, linearity and permissible drift characteristic. Besides, it showed 18㎳ of a response to measure the CO₂ concentration. The fastresponse CO₂ analyzer was applied to a single cylinder SI engine and the CO₂ emission was examined during engine start. Simultaneously, the standard exhaust gas analyzer, which has slow response time, was used for confirming the accuracy of the exhaust gas analysis using the fast-response CO₂ analyzer. The developed analyzer showed much faster responsive characteristic than that of a standard analyzer and made cycle by cycle exhaust gas analysis possible. The transient engine operating characteristics will be estimated from the CO₂ concentration of engine-out emissions and engine operating variables.
송찬혁(Chanhyuk Song),송한림(Hanlim Song),김현수(Hyunsoo Kim) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.5_2
In this paper, CVT oil flow characteristics arc investigated. In order to calculate the oil flow, dynamic models of the ratio control valve, line pressure control valve are obtained by considering the CVT shift dynamics. In addition, CVT vehicle powertrain models are derived. Based on the dynamic models, a CVT flow simulator is developed. It is found from the simulation results that oil pump capacity needs to be determined by the oil flow required for the panic braking and an insufficient flow prevents the CVT from full range downshift, which results in poor re-start performance. In addition, a tandum type oil pump arrangement is proposed to reduce the hydraulic loss as well as to cover the oil flow in the panic braking.<br/> <br/> <br/>