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엄가정(Yan Jiating),김상오(Sang-Oh Kim),곽재섭(Jae-Seob Kwak) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
It is very difficult to polish the surface of magnesium material because of its explosion and fragility properties. Magnetic Abrasive Polishing (MAP) process is one of the nontraditional machining technologies newly developed for these application areas. In the MAP process, a cutting tool that consists of ferrous particles and nonferrous abrasives under oil lubricant is flexible. As a result of this flexibility, the tool can remove a very small amount of material from a workpiece and better surface can be produced after polishing the workpiece. In this study, the MAP of magnesium material was performed. In the experimental verification, design of experimental method was performed to evaluate parameters’ effect of the MAP on polishing results of magnesium material. As a result, it was seen that the MAP was very useful for finishing the magnesium material.
장민규(Min-Kyu Jang),Yan-Jiating,정영득(Yeong-Deug Jeong),곽재섭(Jae-Seob Kwak) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
BMT turret is an indispensable part in CNC lathe turning center. A good driving ASS'Y in BMT turret can improve productivity by reducing tool changeover time. With this in mind, it is essential to design the BMT driving ASS'Y to meet the ever-increasing demand of precision machine tools. In this study, a simulation-based multi-objective design optimization methodology was implemented to improve the efficiency of BMT driving ASS'Y. First, three-dimensional finite element structural and vibration analysis were performed by using ANSYS/Workbench on the initial geometric models of BMT driving ASS'Y. After analyzing stress and deformation concentration zones, several new geometrical models were designed and evaluated by design of experiment and ANSYS/DesignXplorer. Through a series of analysis-evaluation-modification cycles, it was found that designed geometric models were effectively in determining optimal geometric sizes of BMT driving ASS'Y.
Jieqiong Lin,Xian Jing,Mingming Lu,Yan Gu,Baojun Yu,Jiating Tang,Xu Zheng 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.3
Organically modified ceramics are used as photoresistors in the present work. The role of every ingredient played in two photon polymerization process is analyzed. A simple, compact and easy to locate experimental scheme is designed to fabricate nanorods in Ormocer. Based on the threshold theory of photon intensity, the lateral size dependences and vertical size dependences of nanorods on laser power and scanning speed are investigated, respectively. Through systematically changing processing parameters, a 136 nm Ormocer suspended nanorod which is beyond diffraction limit resolution is obtained when v = 115 µm/s, P = 58.5 mW. By this means, two photon polymerization techniques show great potential to obtain a limiting resolution of Ormocer. What is more, micro gear, micro chair, photonic crystal and micro annular lens are fabricated in two photon polymerization in order to exhibit excellent mechanical and optical property of Ormocer.
이정인(Jung-In Lee),김상오(Sang-Oh Kim),Yan Jiating,곽재섭(Jae-Seob Kwak) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
For the production of urethane prepolymer, the effect of process parameters such as diisocyanate MDI and polyol TDI was tested. In this paper, design of experiments has been adopted for studying the effect of the process parameters on the improvement of NCO and viscosity of pre-polymer. As a result of comparison of different parameters, the effect of polyol was stronger than that of isocyanate in comparison of reactivity according to the amounts of isocyanate and polyol. Especially, NCO and viscosity of pre-polymer affected a product safety.
박영환,곽재섭,엄가정,Park, Young-Whan,Kwak, Jae-Seob,Jiating, Yan 한국생산제조학회 2010 한국생산제조학회지 Vol.26 No.2
Base-mounted type(BMT) driving assembly in CNC machine tools is an indispensable part to improve productivity by reducing tool changeover time and to meet the ever-increasing demand of precision machine tools. This study aimed to perform finite element analysis and geometric parameter optimization to improve the efficiency of BMT driving assembly. First, simulations for three-dimensional structural and vibration analysis were performed using ANSYS/Workbench on the initial geometric models of BMT driving assembly. After analyzing stress and deformation concentration zones, several new geometrical models were designed and evaluated by design of experiments and ANSYS/DesignXplorer. Through a series of analysis-evaluation-modification cycles, it was seen that designed models were effective in determining optimal geometry of BMT driving assembly.
박영환(Young-Whan Park),곽재섭(Jae-Seob Kwak),엄가정(Yan Jiating) 한국생산제조학회 2010 한국생산제조학회지 Vol.19 No.2
Base-mounted type(BMT) driving assembly in CNC machine tools is an indispensable part to improve productivity by reducing tool changeover time and to meet the ever-increasing demand of precision machine tools. This study aimed to perform finite element analysis and geometric parameter optimization to improve the efficiency of BMT driving assembly. First, simulations for three-dimensional structural and vibration analysis were performed using ANSYS/Workbench on the initial geometric models of BMT driving assembly. After analyzing stress and deformation concentration zones, several new geometrical models were designed and evaluated by design of experiments and ANSYS/DesignXplorer. Through a series of analysis-evaluation-modification cycles, it was seen that designed models were effective in determining optimal geometry of BMT driving assembly.
Hoo-Kyu Oh(오후규),Tae-Guen Yu(유태근),Geon-Sang Roh(노건상),Hak-Keun Ku(구학근),Jiating Yan 한국마린엔지니어링학회 2007 한국마린엔지니어링학회 학술대회 논문집 Vol.2007 No.-
The heat transfer characteristics of supercritical CO₂ during gas cooling process are investigated experimentally. The test section is a helically coiled tube with I.D. of 4.55, O.D. of 6.35 and length of 10000 [㎜]. The helical coil diameter is 41.35 and 26.75 [㎜], respectively. The apparatus consist of a receiver, a variable-speed pump, a mass flow meter, a pre-heater, a gas cooler (test section) and an isothermal tank. The range of the refrigerant mass fluxes is from 200 to 800 [㎏/㎡s] and the pressure in the gas cooler varies from 7.5 to 10.0 [㎫]. The main experimental results are summarized as follows; as the gas cooling pressure decreases gradually, the heat transfer coefficient increases greatly. The mass flux has a positive effect on heat transfer like constant property condition. The heat transfer coefficient at coil diameter 26.75 [㎜] is larger than that of coil diameter 41.35 [㎜]. The data is compared with the existing correlations, which generally under-predict the measured data. However the experimental data show a relatively good agreement with correlations by Pitla et al. except for pseudo critical temperature.