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권익현,송명엽,방의용,한영수,김기태,이재영,Kwon, Ik-Hyun,Song, Myoung-Youp,Bang, Eui-Yong,Han, Young-Soo,Kim, Ki-Tae,Lee, Jai-Young The Korean Electrochemical Society 2002 한국전기화학회지 Vol.5 No.1
탄화수소가스를 고온$(1000^{\circ}C)$에서 열분해 하여 고상화하는 기상 열분해법을 사용하여 저결정질 탄소재를 제조하고 같은 방법으로 붕소를 첨가한 저결정질 탄소재$C_{l-x}B_x(x=0.05,\;0.10,\;0.20)$를 제조하여, 리튬 이온 이차전지의 부극으로서의 전기화학적 특성을 조사하였다. 시료 대 PVDF를 95:5의 무게비로 첨가한 경우, 붕소를 첨가하지 않은 저 결정질 탄소재(x=0.00)는 초기 방전용량 374mAh/g을 나타내었으며, 제 2싸이클부터는 싸이클 성능이 비교적 우수하여 제 10싸이클에서 258mAh/g의 방전용량을 나타내었다. 시료 대 PVDF를 95:5의 무게비로 첨가한 경우, $C_{1-x}B_x(x=0.00,\;0.05,\;0.10\;0.20)$ 시료들 중에서 x=0.05 조성의 시료는 가장 큰 초기 방전용량 860mAh/g을 나타내었으며, 10번째 싸이클에서 181mAh/g의 방전용량을 나타내었다. 제 2싸이클부터 싸이클 성능은 모두가 비슷하게 나타났다 초기방전 용량(PVDF $10wt.\%$ 사용시, 853mAh/g), 싸이클 성능, 방전용량(PVDF $10wt.\%$사용시 10번째 싸이클에서 400mAh/g)면에서 $C_{0.90}B_{0.10}$ 시료가 리튬이온 이차전지의 부극으로서의 가장 우수한 전기화학적 특성을 나타내었다. 합성한 탄소에 NMP를 용매로 한 액상 혼합 바인더(PVDF)를 90:10의 무게비로 첨가한 경우가 95:5의 무게비로 첨가한 경우보다 대체로 모든 조성에서 충$\cdot$방전용량이 크게 나타났다. 붕소가 첨가되어 덜 disordered된 구조가 됨으로써 1.25V보다 낮은 전압 부분에서 평탄구역이 증가하는 것으로 판단된다. 붕소가 첨가된 경우 충$\cdot$방전용량이 제 2싸이클에서부터 급격히 감소하였는데, 이는 첨가된 붕소가 제 1싸이클에서 삽입되는 Li과 일부는 강하게 결합하여 추출이 안되고 일부만이 다시 가역적으로 추출$\cdot$삽입되기 때문으로 생각된다. 붕소 첨가에 의한 충$\cdot$방전용량의 증가는, 붕소가 electron acceptor로 작용하여 삽입된 Li와 붕소-탄소 host 사이의 결합 강도를 증가시킴으로써 붕소치환 된 탄소에서 Li의 전위를 상승시키기 때문에 일어난다고 사려된다. Disordered carbon and boron-substituted disordered carbons $C_{l-x}B_x(x=0.05,\;0.10,\;0.20)$ were synthesized by Pyrolysis of LPG(liquid Propane gas)and $BCl_3$. Their electrochemical properties as anode materials for Li-ion secondary batteries were then investigated. When PVDF is added to the sample in a weight ratio 5 : 95, the disordered carbon with x=0.00 had the first discharge capacity 374 mAh/g. Its cycling performance was relatively good from the second cycle and it had the discharge capacity 258 mAh/g at the 10th cycle. When PVDF is added to the sample in a weight ratio 5 : 95, the sample with x=0.05 among the samples $C_{l-x}B_x(x=0.05,\;0.10,\;0.20)$ exhibited the largest first discharge capacity 860 mAh/g and discharge capacity 181 mAh/g at the 10th cycle. All the samples had similar cycling performances from the second cycle. The sample $C_{0.90}B_{0.10}$ showed the best electrochemical properties as a anode materials fur Li-ion secondary battery from the view points of the first discharge capacity(853 mAh/g when $10w1.\%$ PVDF is used), cycling performance, discharge capacity(400mAh/g at the 10th cycle when $10wt.\%$ PVDF is used). All the samples showed generally larger charge and discharge capacities when $10wt.\%$ PVDF ratter than $5wt.\%$ PVDF is used. The plateau region in the range of voltage lower than 1.25V becomes larger probably since the structure becomes less disordered by the addition of boron. When boron is added, the charge and discharge capacities decreased suddenly at the second cycle. This may be become only a part of Li are reversibly deintercalated and intercalated and a part of Li which are strongly combined with B are not deintercalated. The increases in charge and discharge capacities are considered to be resulted from the increase in the potential of Li in the boron-added carbons, caused by the strengthening of the chemical bond between the intercalated Li and the boron-carbon host since the boron acts as electron acceptor.
적응적 판매(adaptive selling)에 관한 문헌연구와 향후 연구 제언
권익현,편정범 동국대학교 경영연구원 2017 경영과 사례연구 Vol.40 No.1
기업 간 경쟁이 치열해지고 소비자의 욕구가 다양해지면서 고객 접점에서의 영업활동이 중요해지고 있다. 이에 따라 인적 판매를 통한 성과를 높이기 위해 판매 상황에서 판매원이 소비자의 상황에 따라 판매 전술을 유연하게 변경하는 적응적 판매(adaptive selling)가 학문적으로 또한 실무적으로 주목받고 있다. 본 논문은 적응적 판매에 관한 과거 문헌들에 대하여 고찰하였다. 연구의 분류는 1) 적응적 판매의 개념과 측정, 2) 적용적 판매의 선행 요인에 관한 연구 3) 원인변수로서 적응적 판매에 관한 연구, 4) 적응적 판매의 구체적인 방법에 관한 연구로 분류하여 정리하였다. 마지막으로 적응적 판매와 관련하여 향후에 진행 가능한 혹은 필요한 연구 방향을 제언하였다. As competition between companies becomes more intense and consumers needs become diversified, sales practice in service encounter has been emphasized. In this context, academic researchers and marketing practitioners have focused on adaptive selling, which is the altering of sales behaviors during a customer interaction or across customer interactions based on perceived information about the nature of the selling situation(Weitz et al., 1986). This research investigated prior research dealing with adaptive selling as a main construct. We categorized research according to 4 types: 1) the concept and measure of adaptive selling, 2) antecedents of adaptive selling, 3) results of adaptive selling, 4) specific way to practice adaptive selling. Finally, directions of future research on adaptive selling are suggested.
권익현,김성식 한국경영과학회 2006 韓國經營科學會誌 Vol.31 No.1
In this paper, we investigate the problem of minimizing average inventory costs subject to a fill rate constraint in a two-stage serial inventory model with a normally distributed demand. Fill rate is the fraction of demand that is satisfied immediately from on-hand inventory. We first find the lower bounds of base-stock levels in each node by using the exact base-stock level that satisfies a fill rate in a single node model proposed by Sobel. And then, we extensively analyze the system and show that the cost function is convex. Using such convexity and some other useful properties, we can easily find optimal base-stock levels numerically.
권익현,김청월,김성득,이영태 한국반도체디스플레이기술학회 2018 반도체디스플레이기술학회지 Vol.17 No.3
In this paper, we have developed a multi-attitude monitoring system for running farm robots for field farming. There are many agricultural robots that can select work modules for various tasks. In order to control the stable attitude of agricultural robots connected to each other, we developed a system for monitoring the roll angle and pitch angle difference by fusing the information of the attitude monitoring system mounted on the robot mainframe and the work module. The developed attitude monitoring system showed resolution below 1 degree. In this paper, roll angle difference of 20 degrees and 60 degrees is measured with a multi - attitude monitoring system.
부품 수명주기를 고려한 서비스 부품의 수요예측에 관한 연구
권익현,Kwon, Ick-Hyun 대한안전경영과학회 2017 대한안전경영과학회지 Vol.19 No.3
This research studies on the demand forecasting for service parts considering parts life cycle, that gets relatively less attentions in the field of forecasting. Our goal is to develop forecasting method robust across many situations, not necessarily optimal for a limited number of specific situations. For this purpose, we first extensively analyze the drawbacks of the existing forecasting methods, then we propose the new demand forecasting method by using these findings and reinforcement leaning technique. Using simulation experiments, we proved that the proposed forecasting method is better than the existing methods under various experimental environments.
Fill Rate 제약이 존재하는 2단계 분배형 시스템에서의 분배 계획
권익현,김성식,김창욱 한국경영과학회 2006 韓國經營科學會誌 Vol.31 No.4
This paper considers a periodic review, two-echelon inventory system with one central warehouse and several retailers facing normally distributed demand. The goal is to attain target fill rates, while the systemwide total holding costs are minimized. An important aspect of this problem is material rationing in the case of shortages. If a central warehouse has insufficient inventory to deliver all replenishment orders to retailers, all order quantities are should be adjusted according to some rationing rule. A simple but efficient rationing rule is proposed and compared with the Balanced Stock (BS) rationing as introduced by Heijden which is known to be the best rationing policy in the literature. Numerical results show that the proposed rationing rule is more cost effective than BS rationing, especially for the differences in holding costs between retailers are large.