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BUNDLING COMPETITION BETWEEN MULTI-PRODUCT AND SINGLE-PRODUCT FIRMS
권재현 중앙대학교 경제연구소 2015 Journal of Economic Development Vol.40 No.3
This paper analyzes a simple model where a multi-product firm competes with single-product firms possibly with bundling strategy. Mixed bundling is theoretically known as an effective business tool even in the symmetric competition as well as for the monopoly. Contrary to the literature, this paper shows that mixed bundling is dominated by component pricing or pure bundling. The result holds regardless of the product complementarity by the multi-product firm. In addition, it is shown that linear component pricing will be utilized for low complementarity while pure bundling strategy will be chosen for high complementarity.
SCM 구축을 위한 협업적 수요예측 모형 개발-통신장비 제조산업의 협업 수요예측 실제 사례 모형 연구-
권재현,박상민,남호기 대한산업공학회 2004 산업공학 Vol.17 No.1
We have discussed the importance of collaborative forecasting and the difficulties that can arise during its implementation. We have also proposed the detail process of collaborative forecasting and the system requirement on each step of the process so that the proposed detail process can be easily applied to real life scenario. Lastly, we have talked about a case study of a telecommunication equipment manufacturer that has implemented the proposed collaborative forecasting process that verify the feasibility of the process.
주거용 15W COB LED 다운라이트 방열판 최적설계에 따른 열적 특성 분석 및 평가
권재현,박건준,김태형,김용갑,Kwon, Jae-Hyun,Park, Keon-Jun,Kim, Tae-Hyung,Kim, Yong-Kab 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.2
열에 관한 문제를 해결하기 위해 여러 개의 LED 칩을 1개의 보드에 밀집으로 배열한 COB(Chip On Board)에 관한 관심이 증가하고 있다. LED소자의 온도가 올라갈수록 수명이 감소하고 스펙트럼선의 파장이 본래의 파장보다 장파장 쪽으로 이동하는 적색 이동 현상 및 접합부 온도 상승에 따라 광 출력이 감소되는 큰 문제점이 대두되고 있다. 이러한 열 문제점을 해결하기위해 본 논문에서는 최적의 Fin 두께와 길이를 선정하여 15W급 COB LED 최적의 2차 방열판을 설계하고, 그 설계한 방열판과 15W COB를 패키지하여 Solid Works Flow Simulation을 통한 열적 특성을 분석하여 제작된 15W COB 다운라이트 방열판을 접촉식 온도계를 사용해 열적 특성, 키슬리 2430을 통한 전기적 특성을 분석하였다. There are increasing interests in COB (Chip On Board) that densely arranged many LED chips on one board in order to solve the heat issue. There are many problems being on the rise: the lifespan decreases as the temperature of LED devices increases; Red Shift phenomenon, in which wave length of spectral line moves from original wave length to long wave length, occurs; and optical power decreases as $T_j$ increases. In order to resolve such problems, this study selected the optimum thickness and length of Fin, planned the second Heat sink that is optimum for COB LED with 15W, and analyzed thermal mode by Solid Works Flow Simulation through 15W COB packaging with the planned Heat sink. 15W COB down-light Heat sink that is produced based on this analysis was utilized to analyze thermal mode through contact thermometer and electrical properties through Kelthley 2430.
Numerical Computation of Ultra-High-Degree Legendre Function
권재현,이종기 한국측량학회 2007 한국측량학회지 Vol.25 No.1
The computations of an ultra-high degree associated Legendre functions and its first derivative up to degree and order of 10800 are reported. Not only the magnitude of orders for the ultra-high degree calculation is presented but the numerical stability and accuracy of the computed values are described in detail. The accuracy on the order of 10-25 and 10-15 was obtained for the values of Legendre function and the first derivatives of Legendre functions, respectively. The computable highest degree and order of Legendre function in terms of latitudes and the linear relationship between the magnitude of the function with respect to degrees and orders is found. It is expected that the computed Legendre functions contribute in many geodetic and geophysical applications for simulations as well as theoretical verifications.
메틸싸이오페닐기 함유 1,5-다이아릴 이미다졸 유도체의 프로스타글란딘 생성 억제작용
권재현,박해일,김성수,Kwon, Jae-Hyun,Park, Haeil,Kim, Sung-Soo 대한약학회 2016 약학회지 Vol.60 No.3
Inhibitory activities of 1,5-diarylimidazole analogs with methylthiophenyl group on prostaglandin $E_2$ ($PGE_2$) production from LPS-treated RAW 264.7 cells, were evaluated and compared with those of the corresponding analogs with 4-methanesulfonylphenyl group. Among the tested nineteen analogs with methylthiophenyl group, fourteen analogs showed strong inhibitory activities (>88%) when compared with the reference compound NS-398, and fifteen analogs have similar inhibitory activities with those of parent analogs with 4-methanesulfonylphenyl group. Those results suggest that most of 1,5-diarylimidazole analogs with methanesulfonylphenyl group can be also active even after they are metabolized by reduction.
권재현,류성호,박기영,안규홍,염익태,이용훈 대한상하수도학회 2002 상하수도학회지 Vol.16 No.2
The effects of ozone treatment on the dewaterability of activated sludge wasted from a sewage treatment plant were investigated in this study. Following ozone treatment, sludge was dewatered using a pressure fitter. The sludge filterability evaluated by SRF deteriorated with ozone dosage at relatively low ozone doses due to sludge solubilization and particle size decrease. However, at ozone doses higher than 0.6gO_3/gSS, the SRF of the ozone treated sludge became comparable with the value for the sludge without ozone treatment. It is suggested that the oxidation of the viscous, high molecule organics attached at cell surface reduces the surface charge of sludge particle and promotes flocculation at relatively high ozone doses. Ozone treatment also cause the release of bound water trapped inside cells or flocs, resulting in significant reduction of cake water content after dewatering. In terms of cake volume, more than 70% reduction was obtained at 0.6gO_3/gSS. These observations suggest that ozone treatment has potential to significantly enhance sludge dewaterability and to produce a more compact cake without severe deterioration of its filterability.