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H<sub>2</sub>O/LiBr+HO(CH<sub>2</sub>)<sub>3</sub>OH계 공냉형 이중효용 흡수식 냉방시스템의 사이클 해석
권오경,문춘근,윤정인,Kwon, Oh-Kyung,Moon, Choon-Geun,Yoon, Jung-In 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.2
A cycle analysis was achieved to predict the characteristics by comprehensive modeling and simulation of an air-cooled, double-effect absorption system using a new $H_2O/LiBr+HO(CH_2)_3OH$ solution. The simulation results showed that the new working fluid may provide the crystallization limit 8% higher than the conventional $H_2O/LiBr$ solution. With a crystallization margin of 3wt%(weight%), the optimal solution distribution ratio was found in the range of 36 to 40%. Variation of cooling air Inlet temperature has a sensitive effect on the cooling COP and corrosion problem. The simulation of heat exchangers with UA value revealed that the absorber and the evaporator are relatively important for an air-cooled system compared with the condenser and the low temperature generator. The effect of cooling air flow rate, circulation weak solution flow rate and chilled water inlet temperature were also examined. The new working fluid may provide the COP approximately 5% higher than the conventional $H_2O/LiBr$ solution.
Properties of Zn O Varistor Fabricated by Seed Grain Method
권오경,마재평,백수현,Kwon, Oh Kyung,Mah, Jae Pyung,Paek, Su Hyon The Institute of Electronics and Information Engin 1987 전자공학회논문지 Vol.24 No.3
We investgated I-V cahracteristics and relationship between microstructures and electrical properties in the specimens fabricated by seed grain method for low voltage Zn O varistor. Breaksown voltage was mainly dependent on seed grain size, and could be cntrolled to 10V/mm -15V/mm by sintering temperature and time. In non-seed grain method breakdown voltage generally agreed with final grain size, but did not always agree with it by the change of barrier phase distribution in case of the method using seed grains.
권오경,윤정인,윤재호,Kwon, Oh-Kyung,Yoon, Jung-In,Yun, Jae-Ho 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.5
This study was concerned with the enhancement of mass transfer by surfactant added to the aqueous solution of LiBr. Different vertical inner tubes were tested with and without an additive of normal octyl alcohol. The test tubes were a bare tube, groove tube, corrugate tube and inserted spring tubes. The additive concentration of normal octyl alcohol as a surfactant is about 0.08mass%. The Sherwood number was measured as a function of film Reynolds number 20~200. The experimental results were compared with those which use no surfactant. The enhancement of mass transfer by Marangoni convection effect which was generated by addition of the surfactant is proved for each testing tube Especially, it is clarified that the tube with the spring has the highest enhancement effect. A correlation of the experimental mass transfer data for the bare, groove, corrugate and insert spring tubes results expressed as the form of Sh=cㆍ Re$_{f}$ $^{n}$ .
권오경,이참미,성우경,Kwon, Oh-Kyung,Yi, Chang-Mi,Sung, Woo-Kyung 한국의류산업학회 1999 한국의류산업학회지 Vol.1 No.2
The thermal properies of the pure linen fabrics available in the market and linen blended woven fabrics were measured at the moisture content of 0%, 20%, 40% and 60% using KES-F7 system (Thermo Iabo II type). The experimental properties were statistically analyzed by the rate of water absorbent. The main results were as follows; There is a positive correlation between the thermal insulation value (TIV) and thickness of pure linen fabrics and linen blended woven fabrics by water absorption. Whereas an negative correlation exists between the TIV and cover factor. There is a high positive correlation among the thermal conductivity (k), thickness and weight of pure linen fabrics and linen blended woven fabrics by water absorption. Wherase a high negative correlation exist between the k and air' permeability (Ap). There is a high positive correlation between the feeling of warmth/coldness and bulk density of pure linen and linen blended woven fabrics by water absorption. Wherase a high negative correlation exists between the feeling of warmth/coldness and porosity. There is a negative correlation between TIV and $q_{max}$ of pure linen fabrics and linen blended woven fabrics. The higher the rate of water absorbent, the lower the TIV. This means that TIV decreases by water absorption. As for the thermal property by rate of water absorbent $q_{max}$ and k increase by water absorption and reach max-value at 60% rate of water absorbent. The TIV decreases by water absorption and has +value at 0% rate of water absorbent, whereas it has -value with a feeling of coldness at 20%, 40%. and 60% rate of water absorbent.
권오경,이창미,김묘향,박희웅,Kwon, Oh-Kyung,Yi, Chang-Mi,Kim, Myo-Hyang,Park, Hee-Ung 한국의류산업학회 1999 한국의류산업학회지 Vol.1 No.3
This study was conducted to examine the fatigue phenomenon of mechanical properties in tencel fabrics by repeated washing & shear and tensile deformation. The obtained results are as follows. After performing repeated shear tensile deformation, RT of tencel showed higher increase rate than that of cotton and rayon, whereas its WT and EM was a smaller decrease rate than that of them. This means that tencel's resistance to tensile deformation was the greatest. In the repeated washing and shear tensile deformation, tencel's 2HB, 2HG and 2HG5 showed a remarkable increase rate. In terms of deformation frequency, the greatest change rate appeared at the time of 1000 cycles of repeated shear tensile deformation and 15 times of repeated washing. In the hand value and THV, KOSHI showed a higher increase rate for tencel than for cotton and rayon in both repeated washing and shear tensile deformation, and NUMERI showed a higher increase rate. In the THV the change rate of rayon and cotton could be rarely seen but for tencel, it decreased. tencel's change rate of thermal insulation value by materials was 1.08%, and it increased as the washing frequency increased, compared to the grey fabrics, whereas the change rates of cotton and rayon were 0.74% and 0.22%, respectively. The qmax decreased in the order of cotton>tencel>rayon as the washing frequency increased.
권오경(Oh Kyung Kwon),차동안(Dong An Cha),김현중(Hyeon Joong Kim),박재홍(Jae Hong Park),조성열(Sung Youl Cho) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
The objectives of this paper are to study the characteristics of heat transfer and pressure drop of the plate heat exchanger with corrugation depth by numerical analysis. Plate heat exchanger of three types are designed, which are corrugation depth 3.1mm, 2.8mm and 2.5mm. The plate heat exchanger was numerically investigated for Reynolds number in a range of 950~3,380. The temperatures of the hot side were performed at 14.5℃ while that of the cold side was conducted at 4.5℃. The results show that the performance of heat transfer for corrugation depth 2.5mm increases about 9.5~17.1% compared to that of corrugation depth 3.1mm. On the other hand, the performance of pressure drop for corrugation depth 2.5mm is remarkably higher than that of corrugation depth 3.1mm, about 65.7~86.0%. Numerical results were similar with the experimental results, and the difference was less than about ±5%.
낙동강문화와 부산문화의 소통 - 구비전승문학을 중심으로 : 낙동강문화와 부산문화의 소통
권오경(Kwon Oh-Kyung) 동남어문학회 2006 동남어문논집 Vol.22 No.-
This paper is prepared to present the Communication condition with the culture of Nakdong-river and of Busan, especially in the field of oral literature. in this essay, I studied at first that communication structure in the area culture and, secondly studied that the interact of each area culture. The results are as follows; 1> The category of this essay is legend, traditional folk-song, and a mask dance (Tal-chum). 2> The principle of culture communication is in the oral literature and in the human and nature. for example, there are confrontation or complement principle, ritual and play, production and consumption principle. 3> In the case of internal communication of Busan area culture, I research the "Su-yung Ya-ryu"(Su-yung mask dance). It was damaged by the government in the function of amusements and preservation by force. 4> The communication in Nak-dong river area of culture is effected each other of up and down area. Finally, I said that to develop busan culture, necessary main body who is participate spontaneously in the area festival is needed.