http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Chul-Kyu Kim(김철규) (검색결과 103 건)
- 무료
- 기관 내 무료
- 유료
-
개도율에 따른 가스파이프라인용 볼 밸브 후류유동의 수치평가
김철규,이상문,장춘만,KIM, CHUL-KYU,LEE, SANG-MOON,JANG, CHOON-MAN 한국수소및신에너지학회 2018 한국수소 및 신에너지학회논문집 Vol.29 No.4
Ball valve has been widely used in the field of high-pressure gas pipeline as an important component because of its low flow resistance and good leakage performance. The present paper focuses on the flow nature at the downstream of the ball valve used for gas pipelines according to valve opening rates. Steady 3-D RANS equations, SC/Tetra, have been introduced to analyze the flow characteristics inside the ball valve. Numerical boundary conditions at the inlet and outlet of the valve system are imposed by mass flow-rate and pressure, respectively. Velocity distributions obtained by numerical simulation are compared with respect to the valve opening rates of 30, 50, and 70%. Cavity distributions, asymmetry flow velocity and the flow stabilization point at each opening rate are also compared. When the valve opening rates are 30 and 50%, the flow stabilization requires the sufficient length of 10D or more due to the influence of the recirculation flow at the downstream of the valve.
-
김철규,전우평,박진일,김동주,최해천,Kim, Chul-Kyu,Jeon, Woo-Pyung,Park, Jin-Il,Kim, Dong-Joo,Choi, Haecheon 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.9
In this study, the modification of turbulent boundary layer flow by local wall vibration is investigated. The wall is locally vibrated using a wall deformation actuator, which moves up and down at the frequencies of 100Hz and 50Hz. Simultaneous measurements of the streamwise velocities in the spanwise direction are performed at several wall-normal and streamwise locations using an in-house multi-channel hot wire anemometer and a spanwise hot-wire-probe rake. The mean velocity is reduced in most places due to the wall vibration and its reduced amount becomes small as flow goes downstream. Interestingly, the mean velocity is found to increase very near the wall and near the actuator. This is due to the motion induced by the streamwise vortices which are generated by the downward motion of the actuator. In case of the streamwise velocity fluctuations, their magnitude increases as compared to the unperturbed turbulent boundary layer, and the increased amount becomes small as the flow moves downstream. The modified flow field at the forcing frequency of 50Hz is not much different from that of 100Hz, except the reduced amount of modification.
-
계층적 Mobile IPv6에서의 이동노드를 기반으로 한 경로 개선방법에 관한 연구
김철규(Kim chul-kyu),김정석(Kim jung-suk),김정호(Kim jeong-ho) 한국콘텐츠학회 2004 한국콘텐츠학회 종합학술대회 논문집 Vol.2 No.1
경로 최적화를 기본으로 한 Mobile IPv6의 바인딩 갱신은 자주 이동하는 노드에 의해 시그널 링 트래픽 증가를 초래한다. 이를 보완하기 위해 MAP(Mobile Anchor Point)를 두어 매크로 이동성과 마이크로 이동성의 지역적 이동성을 고려한 계층적 Mobile IPv6가 제안되었다. 그러나 계층적 Mobile IPv6는 패킷 전송에 있어서 MAP를 항상 거쳐야 하므로 MAP의 패킷 집중현상이 발생하고 경로 최적화를 보장하지 못한다. 이에 본 연구에서는 이동 노드의 이동성을 고려한 경로 개선을 수행하여 MAP로의 패킷 집중현상의 완화특성을 해석한다. The binding update of the Mobile IPv6 which does a route optimization in basic by the node which moves frequently brings about the signaling traffic increase of binding update. It supplements this the MAP(Mobile Anchor Point) for to let, and Hierarchical Mobile IPv6 which considers a macro mobility and a micro rambling regional mobility was proposed. But Mobile IPv6 when transmitting the packet, always does to pass by the MAP, the packet intensive actual condition of the MAP to occur it does not guarantee a route optimization. In this study, It accomplishes the course improvement which considers the mobility of mobile node and it interprets the relaxation quality of packet intensive actual condition with the MAP.
-
-
-
-
-
-
The Roles of Questions in English and Korean Science Popularizations
Chul-Kyu Kim(김철규) 담화·인지언어학회 2007 담화와 인지 Vol.14 No.1
Writers use various linguistic devices to construct dialogic interaction between the writer and the reader explicitly in text to enhance the reader's involvement in text. This article, among the various devices, focuses on questions in order to reveal culturally characteristic features between English and Korean science popularizations in newspapers. By using a corpus analysis software for identifying the number of questions in the 356 texts and through setting up analytical categories for describing the genre-specific functions of questions, the analysis reveals that the genre in the two cultures is basically for diffusing scientific knowledge and information to the reader. However, the results also show quantitative and qualitative differences in the two corpora; the English writers employ more questions than the Koreans, and the ways in which questions are used are also different. The English writers tend to use questions to introduce wide-ranging discussions of new scientific knowledge to the reader, whereas the Koreans are likely to utilize them to educate the reader with already proved scientific knowledge. These differences are also reflected in the ways in which the writer aligns his/her persona and the reader's in terms of knowledge-based authority.
-
대공간 건축물의 안정방식에 따른 형태적 특성에 관한 연구
김철규(Kim Chul-Kyu),조성현(Cho Sung-Hyun) 대한건축학회 2009 대한건축학회논문집 Vol.25 No.3
The purpose of this study is to examine the relationship between the structural system used in modern architecture and the form and spatial composition of the buildings. The principle for the stabilization of structures is closely related to the architectural form. That is, in order to stabilize a building, a special type of structural system is required and consequently shows up with consistent characteristics in the architectural form. Structural systems of modern architecture can be classified into skeletal structure, trusses structure, and space structure according to the structural characteristics. Space structure can be divided into compressible space structure and tensile space structure. Spatial building has formal properties according to the stabilization method of vertical load support elements. Master column, buttress and catenary cable enable the fluent flow of load by combining with mechanical efficiency and are able to deal with the generated stress efficiently. The architectural cases for each type of structure are classified into the form-construction type and the plane-composition type in the aspect of architectural effect.
ScienceON
DBpia연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
