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전자 상거래용 카탈로그 저장소를 위한 컴포넌트 기반 아키텍쳐
윤경환(Kyung-hwan Yoon),오재원(Jaewon Oh),홍영준(Youngjoon Hong),박근덕(Geunduk Park),이상구(Sang-goo Lee),우치수(Chisu Wu) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.1A
상거래의 상품 정보를 기술하는 카탈로그는 전자 상거래의 상품 인지 단계에서도 중요한 역할을 하며 대부분의 인터넷 쇼핑 몰에서 전자 카탈로그 저장소의 구축과 유지를 위해 많은 비용을 소모한다. 전자상거래가 활발해지고 인터넷 쇼핑 몰이 급격히 늘어남에 따라 구축과 유지에 많은 비용이 드는 전자 카탈로그 저장소를 공유할 필요가 생겨 났으며, 그에 걸맞는 소프트웨어 아키텍쳐가 요구되고 있다. 이 논문에서는 서로 이질적인 전자 카탈로그 저장소들이 분산되어 있는 환경에서도 각각의 카탈로그들이 상호 연동할 수 있는 컴포넌트 기반 아키텍쳐를 제시한다. 이 아키텍쳐에서 컴포넌트들은 CORBA IDL을 통해 통신을 하며 이로써 이질적인 전자 카탈로그 저장소의 상호연동이 가능해지며 시스템의 신축성과 확장성 역시 높아지게 된다.
사출/압축 공정과 인서트 오버몰딩을 이용한 탄소복합소재 성형에 대한 연구
정의철,윤경환,홍석관,이상용,이성희,Jeong, Eui-Chul,Yoon, Kyung-hwan,Hong, Seok-Kwan,Lee, Sang-Yong,Lee, Sung-Hee 한국금형공학회 2020 한국금형공학회지 Vol.14 No.4
In this study, forming of carbon composite parts was performed using an injection/compression molding process. An impregnation of matrix is determined by ability of wet and flow rate between the matrix and reinforcement. The flow rate of matrix passing through the reinforcements is a function of permeability of reinforcement, a viscosity of matrix and pressure gradient on molding, and the viscosity of the matrix depends on the mold temperature, molding pressure and shear strain of matrix. Therefore, compression molding experiment was conducted using a heating mold in order to confirm the possibility of matrix impregnation. The impregnation of the matrix through the porosities between the woven yarns was confirmed by the cross-sectional SEM image of compression molded parts. An injection molding process was also performed at a short cycle time, high molding pressure and low mold temperature than those of compression experiment conditions. Deterioration of impregnation on the surface of molded parts were caused by these injection conditions and it could be the reason of decreasing the maximum tensile strength. In order to improve impregnation of matrix on the surface, injection/compression molding and insert-over molding were applied. As a result of applying injection/compression molding and insert-over molding, it was shown that the improvement of impregnation on the surface and the maximum tensile strength was increased about 2.8 times than the virgin matrix.
열가소성 직물탄소복합소재 사출 성형품의 표면 함침 개선에 관한 연구
정의철,윤경환,이성희,Jeong, Eui-Chul,Yoon, Kyung-Hwan,Lee, Sung-Hee 한국금형공학회 2021 한국금형공학회지 Vol.15 No.3
In molding of continuous fiber-reinforced thermoplastic composites, it is very difficult to impregnate between the reinforcements and the matrix since the matrix has a high melting temperature and high viscosity. Therefore, most of composite molding processes are divided in the manufacturing processes of intermediate materials called prepreg and the forming of products from intermediate materials. The divided process requires additional facilities and thermoforming, and they increase the cycle time and cost of composite products. These problems can be resolved by combining the continuous fiber-reinforced composite molding process with injection molding. However, when a composite material is manufactured by inserting woven fabric into the injection mold, poor impregnation occurs on the surface of the molded product. It affects the properties of the composites. In this paper, through an impregnation experiment using cores with different heat transfer rates and pore densities, the reason for the poor impregnation was confirmed, and molding experiments were conducted to produce composite with improved surface impregnation by inserting the mesh. And also, the surface impregnation and deformation of composites molded using different types of mesh were compared with each other.
사출성형 조건 변화에 따른 도광판의 황화현산에 관한 연구
이성준,민인기,김종선,이성희,윤경환,Lee, Sung-Jun,Min, In-Ki,Kim, Jong-Sun,Lee, Sung-Hee,Yoon, Kyung-Hwan 한국금형공학회 2015 한국금형공학회지 Vol.9 No.2
Recently, the light guide plate (LGP), a component of the BLU, becomes thinner and larger than ever. In industrial field, specialized injection molding technique is applied to mold the ultra-thin LGP such as a ultra-high speed injection molding. Usually very high melt temperature is used for low viscosity. High injection speed and melt temperature lead to yellowing of LGP. In the present paper a series of injection molding experiment was performed under various injection molding conditions. Yellow index, CIE xy, spectral transmittance of sample were measured using the UV-Visible spectrophotometer. Systematic decrease of spectral transmittance in UV-B range was found as the melt temperature was higher. Yellow index and CIE xy were became higher near the gate location in LGP. From the result of analysis of variance, the main factor to affect for yellow index was mold temperature and that for spectral transmittance(at 315 nm) was melt temperature.
집광채광루버의 슬랫 개폐가 실내 열환경 및 에너지 사용량에 미치는 영향
김은호(Kim, Eun-Ho),윤경환(Yoon, Kyung-Hwan),서로사(Seo, Rosa),신미수(Shin, Mi-su),김철(Kim, Chul),이규남(Rhee, Kyu-Nam) 대한건축학회 2024 대한건축학회 학술발표대회 논문집 Vol.44 No.1
In this study , the effect of open and close of daylighting louver slats on indoor thermal environment and energy consumption was examined under a laboratory condition. A total of six experimental cases were established based on the configuration of the daylight ing louver, folded, closed, and open, during both the cooling and heating seasons. Also, the indoor temperature, vertical temperature difference, PMV, and energy consumption were analyzed. As a result, in the cooling season, when the slat was closed, the indoor temperature and the vertical temperature differences, PMV and energy consumption showthe lowest value. In the heating season, when the slat was closed, the vertical temperature difference was the lowest and PMV was the highest. Based on the findings, it was confirmed that the daylighting louver effectively reduces both cooling and heating energy while improving indoor thermal environment.