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CDMA/TDD 시스템에서 터보 부호를 사용한 H-ARQ 기법 연구
조성철,조대순,이유로,정인철,어윤,권동승,Cho, S.C.,Cho, D.S.,Lee, Y.R.,Jeong, I.C.,Uh, Y.,Kwon, D.S. 한국전자통신연구원 2001 전자통신동향분석 Vol.16 No.6
IMT-2000에서 제공하고자 하는 인터넷 서비스나 멀티미디어 서비스를 위하여 고속 패킷 전송이 이루어 져야 한다. 이러한 고속 패킷 서비스의 경우 불연속적인 데이터의 전송 및 비대칭적 데이터 트래픽의 특성으로 인하여 최근 CDMA/TDD 시스템에 대한 연구가 관심의 초점이 되고 있다. 따라서 본 고에서는 TDD 방식을 사용한 시스템의 특성을 고려하여, 전송 프레임의 구성 방식, 오류 발생 프레임의 재전송 방식, 채널 부호화 방식 등에 대하여 고찰하도록 한다.
디젤자동차의 저공해형 연료공급장치 개발 I (유화연료의 특성 및 분무거동)
조성철,윤면근,류정인,Cho, S.C.,Yoon, M.K.,Ryu, J.I. 한국액체미립화학회 1997 한국액체미립화학회지 Vol.2 No.3
Ta investigate characteristics and spray of emulsified fuet we are mixed water with diesel oil using ultrasonic energy fuel feeding system. Separation ratio of emulsified fuel was shown good condition that of water content is small and longer ultrasonic energy adding time. Viscosity of emulsified fuel increased 79% with addition to water content and surface tension increased 1.6% in comparision to pure diesel oil. The SMD of emulsified fuel adding ultrasonic energy decreased with 3% in comparision to pure diesel oil. With increasing 5, 10% water content the SMD decreased 15.6, 20.1% in comparision to pure diesel oil. The mind-explosion was investigated with 4step.
디젤자동차의 저공해형 연료공급장치 개발 Ⅰ (유화연료의 특성 및 분무거동)
조성철(S.C.Cho),이승진(S.J.Lee),윤면근(M.K.Yoon),류정인(J.I.Ryu) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
To investigate characteristics and spray of emulsified fuel, we are mixed water with diesel oil using ultrasonic energy fuel feeding system. Separation ratio of emulsified fuel was shown good condition that of water content is small and longer ultrasonic energy adding time. Viscosity of emulsified fuel increased 7% with addition to water content and surface tension increased 1.6% in comparision to pure diesel oil. The SMD of emulsified fuel adding ultrasonic energy decreased with 3% in comparision to pure diesel oil. With increasing 5, 10% water content, the SMD decreased 15.6 , 20.1% in comparision to pure diesel oil. The micro-explosion was investigated with 4step<br/>
초음파 에너지 부가 복합연료를 이용한 디젤기관의 성능특성에 관한 연구Ⅰ
조성철(S. C. Cho),김용국(Y. K. Kim),류정인(J. I. Ryu) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_2
To investigate properties of emulsified fuel, we are mixed diesel oil. water. methanol and surfactant for improvement of fuel characteristics. And we tested viscosity, heating value. surface tension and specific gravity.<br/> The results are as follows:<br/> 1) After we examined the safety to phase-seperation ratio of emulsified fuel according to<br/> changes in H.L.B values of surfactants. we found that the ratio of phase-seperation happened to maximum 1.6% for 5 hours after manufacturing emulsified fuel. As aresult of above, we knew the surfactants with H.L.B value 4.3 and 3.8 worked better than others.<br/> 2) We could confirm that emulsified fuel got about 88% of diesel oil through measuring<br/> heating value. So we could prove the possibility of emulsified fuel<br/> 3) Surface tension decrease according to ratio of water content and surfactant.<br/> 4) Viscosity and specific gravity increases according to ratio of water content<br/>
조성철(S.C.Cho),최두석(D.S.Choi),이흥영(H.Y.Lee),류정인(J.I.Ryu) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper was studied in hydrogen generating apparatus to apply hydrogen engine with generating gas(H2) using methanol-steam reformer. Methanol-steam reformer was designed on the basis of the several variables.<br/> The main purpose of this study was that found the optimum condition hydrogen gas concentration in the reformed gas. The results indicated that the optimum conditions were 260℃ in reformer temperature. 220℃ in vaporizer and 2Kg/cm² in operating pressure<br/>
안순혁(S.H.Ahn),윤면근(M.K.Yoon),박세영(S.Y.Park),조성철(S.C.Cho),류정인(J.I.Ryu) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
Today, modern society is an excessive consumption age of petroleum energy. An excessive consumption of petroleum fuel is accompanied with the panic of ultimate depletion of existing oil resources and environmental contamination by exhaust gas.<br/> Based on this situation, gasoline-methanol blends which is the mixture of gasoline and alcohol as well as compatible to existing spark ignition engine with minor or modification was developed. <br/> This is an experimental research to study the characteristics of spray for gasoline-methanol fuel with gasoline injector. To measure the droplet size(SMD) we used the Malvern system 2600c.<br/> The results of study are that in the physical properties, the specific gravity and viscosity of blending fuel increase, mean diameter of droplet(SMD) decrease as injection pressure increase and SMD increase in the increase of blending rate.<br/>