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RISS 인기검색어
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- 저자 : 권오경(Kwon Oh Kyung) (검색결과 363 건)
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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.
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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$_{f}$ $^{n}$ .
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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.
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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.
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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.
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권오경 ( Oh Kyung Kwon ) 택민국학연구원 2011 국학연구론총 Vol.0 No.7
이 글은 경남 합천군에 전승하는 당산제-동제-의 전승 현황과 과제를 살핀 것이다. 합천군을 대상으로 동제를 포함한 마을신앙을 현장조사하고 전승현황을 분석하고 전승의 방향을 제시한 선행연구가 거의 없다는 점과, 한국의 마을신앙의 전반적 모습을 조망한다는 거시적 관점에서 합천군의 자료 발굴이 절실히 요청되는 현실적 문제가 어울려 본고의 작업이 이루어졌다. 합천군 동제는 당산제라는 명칭과 산신제라는 명칭을 가장 많이 사용하고 있다. 제일은 음력 정월 14일 저녁이나 15일 새벽이 가장 일반적이다. 14일과 15일의 경계지점인 자정 무렵에 제를 올리는 것이 관례이다. 당집은 보존되는 경우가 거의 없다. 대신 당목이 존재하는데, 합천군의 경우 소나무가 대부분이다. 합천군 당산제의 구조적 특징을 분석해보면, 1) 음양, 상하, 암수, 출입(出入)의 대응적 문화구도를 보이고 있으며, 2) 제의 후 제물처리의 경우, 산신제를 지내는 경우에는 산신에게 바치는 제물은 당목 아래나 땅 속에 묻어두는 풍속이 성행한다. 3) 풍수사상에 의한 당산제 거행, 4) 마을신앙 자체가 마을의 안녕을 추구한다는 점에서 제의의 폐쇄성을 그대로 유지한다는 점, 5) 축문을 통해서 볼 때, 유교식 당산제와 무속적 성향의 당산제가 혼유되어 있음을 알 수 있다. 국문식 표기와 한문식 표기, 남성 중심과 여성 중심의 제의, 대상 신의 구체성 유무 등을 들 수 있다. 그러나 마을 공동체 구성원의 공생성이라는 점에서는 이견이 없다. 6) 당산제의 변이성과 고정성이 엮여 있는데, 이는 제의 절차 과정에서 개입되는 제의의 핵심적 요인-제물 장만, 제관 선정 등-과 주변적 요인-제의 시간, 부속품의 대체 등-의 구성방식과 인식의 변화가 변이와 고정성을 결정하는 요인이 된다. This paper is prepared to research the traditional county ritual which is played in the 14th night of January by lunar calendar, especially in the Hapcheun area. A former study about these theme was rarely. And this area``s field work for getting a texts or informations is necessary. The general names for county``s traditional village ritual, are ‘Dangsanje’ or ‘Sansinje’-This means ‘shrine’. DangSanJae originated from the respect of tree gods and in Hapcheun area, the fine tree is used as shrine in general. Ritual is performed usually in the midnight of 14th of Jan. or in the dawn of 15th of Jan. The god``s house is rare. Village Ritual is composed by several remarkable structures. 1)the comparative and correspondent cultural structure. This is contains the yin and yang, male and female, in and out, up and down. 2)the treatment of sacrificial offering. after ritual, village people bury the pig under the tree god. 3) Ritual was composed by geomancy. 4) Ritual is sustain the rigorism for the rewards which contain the health, wealth, long life, safety of family. 5)village ritual is mixed with shamanism and Confucianism. Therefore. There are two aspects of man and woman``s culture. To keeping shamanism is especially related with woman``s culture. Written prayer is related with man``s culture, Confucianism.
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쉐브론 각도변화에 따른 판형 고온 용액열교환기의 성능평가
권오경(Oh-kyung Kwon),차동안(Dong-an Cha),윤재호(Jae-ho Yun),김효상(Hyo-sang Kim) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.7
The objectives of this paper are to measure the heat transfer and pressure drop of the plate heat exchangers for absorption system applications. Three types of plate heat exchangers with different chevron angles are tested in the present experiment. Heat transfer and pressure drop performance of plate heat exchangers are measured in various operating conditions, and compared each other. The results show that the heat transfer rate of high theta (120°) and mixed theta plate heat exchanger increases about 118% and 98% at the solution flow rate 350 ㎏/h compared to that of low theta (60°), respectively. The effectiveness of high theta was evaluated about 0.53 ~ 0.85 in this experimental range. The experimental correlations of the Nu and f were developed with error bands of ±7% and ±12%.
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