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이남석,박만호,최용석,Lee, N.S.,Park, M.H.,Choi, Y.S. 한국전자통신연구원 2017 전자통신동향분석 Vol.32 No.5
The research, design, and development of wireless access technologies using the new 6 to 100GHz band mmWave are actively underway in order to address the frequency shortage problem in the sub-6GHz band and accommodate the 5G technical requirements, such as the increased transmission capacity. Technical elements to efficiently overcome the problems caused by mmWave signal characteristics, support an effective interworking with a conventional communication service, and ensure smooth mobility between mmWave base stations and existing base stations are also being investigated. This paper discusses the technical solutions for an mmWave-based 5G RAN configuration and their considerations under various operational scenarios.
HC Adsorber 를 이용한 가솔린 엔진의 냉시동시 탄화수소 저감기술에 관한 연구
최병철(B.C.Choi),이남석(N.S.Lee),손건석(G.S.Son) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
Experiments were carried out to investigate the characteristics of the hydrocarbon emissions and cold start hydrocarbon reduction in gasoline engine. The adsorber used was Pd/Rh catalyst-loaded zeolite monolith type. Experiments of the hydrocarbon emissions reduction were conducted in the adsorber temperature of 50, 100, 200 and 300℃ It was found that the hydrocarbon emissions were efficiently trapped during the adsorber temperature below 1001 by physisorption, and were reduced gradually by the catalytic activation of Pd/Rh catalysts in the adsorber temperature above 1001. Methane, ethylene and n-butane concentration in the middle of C1 to C6 increase as the fuel/air mixture to be rich and as the engine speed decreases. The medium size hydrocarbon emissions from C4 to C6 were significantly reduced as the adsorber temperature increases, but the small size hydrocarbon emissions from Cl to C3 were increased because of molecules cracking phenomenon.<br/>