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김용철(Yongchul Kim),허의남(Euinam Huh),황준(Jun Hwang),김영찬(Youngchan Kim) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.2Ⅲ
그리드는 고성능 컴퓨터, 대용량 데이터베이스, 각종 정보통신 첨단장비 등을 초고속 네트워크로 연동해 상호 공유하는 핵심기술과 운영체제를 말하며, 이를 효율적으로 활용하기 위해서는 자원의 특성과 사용자의 신원에 의해 제한적으로 액세스가 가능한 메커니즘과 신원이 확인된 사용자의 권한 유무를 검증할 수 있어야 한다. 따라서 사용자와 관리자 양방의 편리성과 안정성을 위해 그리드의 보안은 단일 인증 기능을 제공해야 하는데, 기존의 방식은 공개키 인증서 방식의 복잡한 알고리즘을 사용하므로 인증 시간이 오래 소요되며, 전체적으로 그리드 성능을 저하시키는 요인이 된다. 따라서 본 논문에서는 이를 해결하기 위하여 SAML을 이용한 그리드 단일 인증 보안 기법을 제안하고자 한다.
김용철(Yongchul Kim),조후택(Hootaek Cho),나원균(Wonkyun Na) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Recently, Cabin air filter is widely used in automotive vehicle to fulfill customer's 'well-being' demands. But survey reports show many customers feel difficulties in recognizing appropriate replacement schedule of cabin air filter which causes the performance downshift of air conditioning system. Accordingly, we studied a cabin air filter changing alarm system. HVAC conditions. driving area, and the material of cabin air filter are considered throughout this alarm system, and the analyzed results call inform the customers for the replacement schedule when dust amount of cabin air filter reaches to a set point. Test results of this system shows the detection accuracy is satisfied within 8 percents error range.
승용차 자연 환기성능 향상을 위한 REAR부 유동특성 연구
김용철(Yongchul Kim),나원균(Weonkyun Na) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
It needs to deforgging system in vehicle for the purpose of the safe driving and pleasantness in side of vehicle. It is very important for deforgging system in a vehicle to ventilation performance. In this study, the flow characteristics for improvement of the ventilation performance in rear part of vehicle was performed computationally using CFD. Control factors are gap of between rear glass and rear package tray, extractor hole position and extractor hole area. Incase of gap and extractor hole position change, Relative pressure drop is improved about 19%. And incase of extractor hole position and area change, Relative pressure drop is improved about 37.6%. Control factors have to apply to at the same tine in order to increase relative pressure drop
고장 발생 시 이중 권선 전동기의 권선 배치에 따른 토크 리플 연구
김용철(Yongchul Kim),노영우(Youngwoo Noh) 한국조명·전기설비학회 2024 조명·전기설비학회논문지 Vol.38 No.1
As automotive steering technology advances and becomes electrified, high-level safety designs such as fault-tolerant or fault-operation are required to maintain the primary function even when a failure occurs. For this purpose, a dual-winding electric motor was introduced in the steering system, making it possible to maintain the driver’s steering assistance function even in the event of breakdown cases. Dual-winding motors can take into account various winding arrangements depending on the pole-slot combination of machines, and accordingly, when driven with only one 3-phase winding, non-uniformity of the magnetic flux linkage to the phase windings may occur and eventually lead to different magnitudes of mutual inductance. This paper presents a mathematical model of dual-winding motors and studies how the imbalance of mutual inductance for each winding arrangement affects the characteristics of the electric machine. As a result, it was derived through the calculation results of the mathematical model that the electrical secondary torque ripple appears significantly in the winding method where the mutual inductance imbalance is significant, and the validity of the calculation results of the mathematical model was proven by comparing it with the finite element analysis results.
김용철(Yongchul Kim),성낙섭(Naksup Sung),박동규(Dongkyou Park),조후택(Hootaek Cho) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
Recently, the quick heating performance is the big issue in the vehicle because engine performance is high. So car makers adapted the additional heating devices (ex. PTC heater). As quick cabin cooling performance is recorded in the IQS, it is an important issue, too. In this study, the HVAC intake door control is studied for quick heating and cooling performance. In case of the heating performance, it improves 4.0℃ at -20℃ ambient after 20 minutes. And in case of cooling performance, it improves 1.5℃ at 35℃ ambient after 10 minutes. In addition, intake door control system brings on the cost reduction about 200 won because the flab door is eliminated. In present, intake door control system is adapted all HKMC new developing car.
김용철(Yongchul Kim),성낙섭(Sungnak Sup),진건수(Keonsoo Jin),조후택(Hootaek Cho) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The objective of this study is enhanced thermal performance of the high voltage PTC heater for using a heat source of the electric vehicle or fuel-cell electric vehicle. To optimize performance, design for six sigma(DFSS) Technique was used in this paper. Optimization is made by changing the shape and size of the heater fin. In conclusion, the new high voltage PTC heater is technically superior to its previous PTC heater. Thermal performance and pressure drop is approximately 17% improved.