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공기연료비의 변화에 따른 제어자발화 가솔린기관의 배기 특성
김홍성,Kim, Hong-Wung 한국기계가공학회 2004 한국기계가공학회지 Vol.3 No.2
This work treats a controlled auto-ignition (CAI) single cylinder gasoline engine, focusing on the extension of operating conditions. Investigated are the engine emission characteristics under the wide range of operating conditions such as 32 to 63 in the air-fuel ratio, 1000 to 1800 rpm in the engine speed, and 150 to $180^{\circ}C$ in the inlet-air temperature. A controlled auto-ignition gasoline engine can be achieved the ultra lean-burn with self-ignition of gasoline fuel by heating inlet air. It can be achieved that the emission concentrations of carbon monoxide, hydrocarbons and nitrogen oxides had been significantly reduced by CAI combustion compared with conventional spark ignition engines.
김홍성,조현옥 한국섬유공학회 1992 한국섬유공학회지 Vol.29 No.2
Iodine sorption of polyacrylonitrile(PAN) in aqueous I$_2$/KI solution was investigated for structural study of PAN. The sorption behaviors for uniaxially oriented film and unoriented film show a distinct difference below the concentration of O.8mole/l. The dimension of oriented film treated above this concentration recovers its original dimension. As the diffusion of iodine into PAN is the mode of non-Fickian, the diffusion coefficient increases with time of sorption. The sorption behavior in disordered region of oriented film is found to be similar to that of unoriented film. It is ascertained that iodine is able to penetrate into ordered as well as disordered region of PAN below the concentration of 0.5 mole/l.
김홍성,오상봉 대전대학교 산업기술연구소 2001 산업기술연구소 論文集 Vol.12 No.1
We developed a material management information system for Younghwa Company, which is one of small and medium-sized company producing chairs for hair dressing saloons and hospital. Younghwa Company uses more than 1,000 materials to produce more than 20 product models, In this study, we analysed the ordering process and scheduling process in the Younghwa Company and developed the information system to automate the above two processes, The material management information system consists of five subsystems, client management subsystem, product management subsystem, material management subsystem, analysis subsystem, and reprort subsystem. We also implemented the company database using Access 2000.
요오드 흡착에 의한 폴리아크릴로니크릴 구조의 변화(II)
김홍성,조현혹 한국섬유공학회 1992 한국섬유공학회지 Vol.29 No.3
The structural change of polyacrylonitrile was investigated by iodine sorption in aqueous 1$_2$/KI solution. lodines could penetrate into the crystalline phase of polyacrylonitrile and disturb the laterally ordered polyacrylonitrile crystals below the low concentration of which I/M=O.33. Beyond this I/M up to 0.77, these iodine ions were found to form a linear lattice of about 3.1 A spacing like as in other systems and to orient parallel to the orientation axis in the crystalline phase of polyacrylonitrile. The 5.8A, 4.1A, and 3.9A diffraction intensities for polyacrylonitrile-iodine complex were observed on equator, which increase with increasing iodine concentration in the sorbed phase. These observed diffraction intensities and sorption-desorption behaviors suggest that the iodine which penetrates into crystalline phase intercalates between molecular rods of polyacrylonitrile without a conformational change, and forms a new ordered structure with the parent polymer.
소형 압축기를 이용한 관성관형 맥동관 냉동기의 성능 특성에 대한 실험적 연구
김홍성,정상권 대한설비공학회 2005 설비공학 논문집 Vol.17 No.6
This paper describes an experimental study on the inertance pulse tube refrigerator using a small compressor. The purpose of this experimental study is to identify the performance of the inertance pulse tube refrigerator for various operating conditions and to obtain the optimum configuration. The dead volume effect is verified by two experimental apparatuses with different dead volumes between the compressor and the aftercooler. The refrigerator of the smaller dead volume shows better performance. The influence of operating frequency and charging pressure on the performance of the refrigerator is experimentally investigated. Reducing the regenerator mesh size improves the performance of the refrigerator. Finally, the inertance pulse tube refrigerator has maximum cooling capacity at the specific combination of the pulse tube length and the inertance tube length. The loss analysis is used to analyze and predict the optimum condition of the pulse tube refrigerator.
Gene Expression Profiling in Osteoclast Precursors by Insulin Using Microarray Analysis
김홍성,이나경 한국분자세포생물학회 2014 Molecules and cells Vol.37 No.11
The balance between bone formation by osteoblasts and destruction of mineralized bone matrix by osteoclasts is important for bone homeostasis. The increase of osteoclast differentiation by RANKL induces bone diseases such as osteoporosis. Recent studies have shown that insulin is one of main factors mediating the cross-talk between bone remodeling and energy metabolism. However, the systemic examination of insulin-induced differential gene expression profiles in osteoclasts has not been extensively studied. Here, we investigated the global effects of insulin on osteoclast precursors at the level of gene transcription by microarray analysis. The number of genes that were up-regulated by 1.5 fold after insulin treatment for 6 h, 12 h, or 24 h was 76, 73, and 39; and 96, 83, and 54 genes were down-regulated, respectively. The genes were classified by 20 biological processes or 24 molecular functions and the number of genes involved in ‘development processes’ and ‘cell proliferation and differentiation’ was 25 and 18, respectively, including Inhba, Socs, Plk3, Tnfsf4, and Plk1. The microarray results of these genes were verified by real-time RT-PCR analysis. We also compared the effects of insulin and RANKL on the expression of these genes. Most genes had a very similar pattern of expressions in insulin- and RANKL-treated cells. Interestingly, Tnfsf4 and Inhba genes were affected by insulin but not by RANKL. Taken together, these results suggest a poten-tial role for insulin in osteoclast biology, thus contributing to the understanding of the pathogenesis and development of therapeutics for numerous bone and metabolic diseases.