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박익근 ( Ik Keun Park ),박은수 ( Un Soo Park ),김현묵 ( Hyun Mook Kim ),안형근 ( Hyung Keun Ahn ),김정석 ( Chung Soek Kim ),권숙인 ( Sook In Kwun ),변재원 ( Jai Won Byeon ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.1
It is very important to evaluate the surface or subsurface microstructure because of th on mechanical properties of materials. Surface SH-wave which is horizontally polarized traveling along near surface and subsurface layer is an attractive technique for material difficulty in preparing specimens form in-service industrial facilities. In this stud evaluation for degraded structural materials used at high temperature by Surface SH-wave discussed. 2.25Cr-lMo steel specimens which were prepared by the isothermal aging heat tr 650° were evaluated by ultrasonic nondestructive evaluation techniques investigating th velocities, attenuation coefficient and amplitude spectra etc. In addition, it has verif the frequency-dependence of ultrasonic group velocity and attenuation coefficient using wav
오일분리 장치 형상 변화에 따른 오일분리 성능에 관한 해석적 연구
우근섭(Keun-Sup Woo),박영준(Young-Joon Park),조용석(Yong-Soek Cho) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A closed crankcase ventilation (CCV) system has been adopted to engines to reduce blow-by gas emission. In the CCV system, blow by gas which contains engine lubricant oil is circulated to intake system. The system has a problem on blow-out of engine lubricant oil. To reduce loss of the engine oil, high efficiency oil separation devices are required. Principle of cyclone oil separator is centrifugal force in the separator, and oil separator designs influence on rotational flow which causes the centrifugal force. In this paper, oil separation performances for cyclone type designs are calculated with CFD methodology. The major design parameters considered in the analysis model are inlet area, cone length, and outlet depth of the oil separator. From the numerical analysis results, reducing inlet area and increasing cone length seem to increase oil separation performance. Changes in outlet depth could avoid interference between rotational flow and outlet flow in the cyclone oil separator.
이충배(Choong-bae Lee),방희석(Hee-soek Bang),이정민(Jung-min Lee),박근식(Keun-sik Park),박선영(Sun-young Park) 한국국제상학회 2007 國際商學 Vol.22 No.4
International trade volume of China has been growing with the Chinese economic boom in recent years. In line with these trends, Chinese logistics market is rapidly increasing, which is leading to become a center of global logistics network in Northeast Asia. The volume of trade between Korea and China has also been growing significantly every year. The economic and logistics cooperation between the two countries is expected to provide mutual economic benefits. However there are still huge impediments in logistics network between the two countries including bottleneck in transport and customs procedures.<BR> The propose of this study is to identify key obstacles and suggest strategies for logistics revitalization between Korea and China, Shandong Province in particular. In order to achieve the objectives of this study, questionnaire survey was undertaken in order to assess the importance of various logistics sectors, obstacles to logistics cooperation etc.<BR> We suggest the policy implications such as construction of logistics center, revision of laws and systems related customs clearance, development of the sea&air transportation, establishment of integrated logistics systems etc. for the logistics cooperation between Korea and China.