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Hydrox Gas 절단과 LPG 절단의 열적특성에 관한 연구
김홍건,곽이구,Kim, Hong-Gun,Kwac, Lee-Ku 한국생산제조학회 2010 한국생산제조학회지 Vol.26 No.2
Cutting procedures where qualities are determined by various demand factors largely influences shipbuilding productivity. Particularly, defects in cutting shapes and cutting surface results in delay for post shipbuilding stages such as in welding and assemblage lines which could become factors for reduced economic viability of the project. Existing cutting procedures utilize fossil fuels such as propane or ethylene as the main fuel component and these methods applied particularly to ship plate cutting gives relatively slow cutting speed and generates large quantities of harmful and sometimes poisonous polluting fumes of which warrants an urgent need to look for alternative cutting methods. Recent introduction of hydrox gas generated by electrically dissociating water into hydrogen and oxygen components to be utilize as an alternative cutting fuel has resulted not just in visible improvement on cutting quality and speed over the existing methods but it has also been welcomed as an environmentally friendly clean fuel source. This paper has been prepared to serve as the basis for accommodating this environmentally friendly hydrox gas cutting method into actual working environment by observing and recording hydrox gas cutting thermal characteristics.
김홍건,곽이구,Kim, Hong-Gun,Kwac, Lee-Ku 한국생산제조학회 2010 한국생산제조학회지 Vol.26 No.2
Hydrox gas which is the mixed gas of hydrogen and oxygen gained fromwater electrolysis is one of the new clean energy sources and thus is researched and commercialized actively. Especially, it can be replaced the fossil energy and shows the better quality compared to the conventional energy such as LPG or acetylene gas. The mixed gas of hydrogen and oxygen is gained from water electrolysis reaction. It has constant volume ratio 2:1 of hydrogen and oxygen, and it is used as a source of thermal energy by combustion reaction. Further, hydrox gas is nearly a mixed ideal gas combusting itself completely and its combustion shows anunique characteristics of implosion. In this study, temperature rise effects on hydrox gas content through mixed combustion test of kerosene and hydrox gas and LPG and hydrox gas are investigated. it is also confirmed that economy of mixed combustion of hydrox gas as effective energy is fairly probable.
Hydrox Gas 절단과 LPG 절단의 열적특성에 관한 연구
김홍건(Hong Gun Kim),곽이구(Lee Ku Kwac) 한국생산제조학회 2010 한국생산제조학회지 Vol.19 No.2
Cutting procedures where qualities are determined by various demand factors largely influences shipbuilding productivity. Particularly, defects in cutting shapes and cutting surface results in delay for post shipbuilding stages such as in welding and assemblage lines which could become factors for reduced economic viability of the project. Existing cutting procedures utilize fossil fuels such as propane or ethylene as the main fuel component and these methods applied particularly to ship plate cutting gives relatively slow cutting speed and generates large quantities of harmful and sometimes poisonous polluting fumes of which warrants an urgent need to look for alternative cutting methods. Recent introduction of hydrox gas generated by electrically dissociating water into hydrogen and oxygen components to be utilize as an alternative cutting fuel has resulted not just in visible improvement on cutting quality and speed over the existing methods but it has also been welcomed as an environmentally friendly clean fuel source. This paper has been prepared to serve as the basis for accommodating this environmentally friendly hydrox gas cutting method into actual working environment by observing and recording hydrox gas cutting thermal characteristics
연료전지 Flower Field Plate 최적성능모사에 관한 연구
김홍건(Hong Gun Kim),곽이구(Lee Ku Kwac),강영우(Young Woo Kang),송하영(Ha Young Song) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
A numerical flow-field analysis is performed to investigate flow configurations in the anode, cathode and cooling channels on the flower field plate of a proton exchange membrane fuel cell(PEMFC). The plate consists of gas slits that form the gas channels in the cell, hole for the tie rods that keeps the stack together, and the heating elements, which are positioned in the middle of the gas feeding channel for the electrodes. Due to symmetry, it is possible to reduce the model geometry to 1/8 of the actual size of the cell. For this study, Usually, display performance about 80% if compare with Plate of carbon quality of the material that have the best performance.
고분자 전해질형 연료전지 전극(Cathode)의 성능모사
김홍건(Hong Gun Kim),강영우(Young Woo Kang),곽이구(Lee Ku Kwac),송하영(Ha Young Song) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
Fuel cells are devices that convert chemical energy directly into electrical energy. Among many kinds of the fuel cell, Polymer electrolyte membrane fuel cell is such kind of thing which work under low temperature. In this case, a 3D geometry of a cathode from a fuel cell with perforated current collectors. The current density distribution shows that the variations are rather large. The rate of reaction and the current production is higher beneath the orifice, and decreases as the distance to the gas inlet increases. This means that the mass transport of reactant dictates the efficiency of the electrode in this particular design and at these particular conditions.
김홍건(Hong Gun Kim),곽이구(Lee Ku Kwac) 한국생산제조학회 2010 한국생산제조학회지 Vol.19 No.2
Hydrox gas which is the mixed gas of hydrogen and oxygen gained fromwater electrolysis is one of the new clean energy sources and thus is researched and commercialized actively. Especially, it can be replaced the fossil energy and shows the better quality compared to the conventional energy such as LPG or acetylene gas. The mixed gas of hydrogen and oxygen is gained from water electrolysis reaction. It has constant volume ratio 2:1 of hydrogen and oxygen, and it is used as a source of thermal energy by combustion reaction. Further, hydrox gas is nearly a mixed ideal gas combusting itself completely and its combustion shows anunique characteristics of implosion. In this study, temperature rise effects on hydrox gas content through mixed combustion test of kerosene and hydrox gas and LPG and hydrox gas are investigated. it is also confirmed that economy of mixed combustion of hydrox gas as effective energy is fairly probable.
김홍건(Hong Gun Kim) 한국생산제조학회 2008 한국생산제조학회지 Vol.17 No.6
An automation process of filter unit is presented for the application of the assembling procedure and dry furnace work. By that automation procedure, it is expected to enhance working environment such as reducing laboring load, harmful gas, and burning scald. Furthermore, this automation process also minimizes via standardization of manufacturing process so that it may increase productivity and reliability. An automation process of filter unit is presented for the application of the assembling procedure and dry furnace work. Filter automation process also gives a good quality and productivity by simplifying to only one line from the complicated process such as filter cutting→adhering→fabricating in a very small space. It is found that a new conceptual design of dry furnace shows the better quality like uniform heat distribution compared to the conventional design. It is also found that the present design gives a better working environment by adding cooling system.
고가사다리차의 알루미늄 붐 형상의 최적설계에 관한 연구
김홍건(Kim Hong-Gun),나석찬(Nah Seok-Chan),홍동표(Hong Dong-Pyo),조남익(Cho Nam-Ik) 한국생산제조학회 2007 한국생산제조학회지 Vol.16 No.3
An Optimal shape design of the boom system in high ladder vehicles is performed using 3-D finite element method (FEM). Results of structural analyses providing displacements, stresses are implemented for the optimum shape design. Lanzcos algorithm is used for the modal analysis in order to find natural frequencies. The optimal shape including cross sectional thickness and length of the boom system is controlled by the subproblem method besed on displacement and Von Mises stress. It is found that a plenty of materials can be saved by using shape design optimization in high ladder vehicles. It is also found that the natural frequency is increased until 6th mode and maintained similarly or decreased after 6th mode.