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하이브리드 다중 Hub-and-Spoke 차량 경로 계획 모형
이용대(Yongdae Lee),정현종(Hyunjong Jeong),손영수(Young Soo Son),윤치환(Chiwhan Yoon) 한국경영과학회 2011 經營 科學 Vol.28 No.3
Hub-and-spoke transportation network is a powerful and useful network structure that takes full advantage of economies of scale on routes between hubs. In recent studies, the network structure is extended to hybrid hub-andspoke that allows direct transportation between spokes. In this study, we considered more extended network structure which is called hybrid multiple hub-and-spoke that has multiple hubs and allows direct transportation between spokes. We developed a mathematical optimization model for automotive service parts transportation planning under hybrid multiple hub-and-spoke network structure. The model suggests a long-term transportation route planning and a short-term vehicle assignment planning. The model is verified by simulation and validated in real world application to Hyundai Mobis automotive service parts transportation planning. From the simulation result, the model reduced the transportation cost about 24.7%, the total distance about 6.8% and the CO2 emissions about 8.8%. In real world application for 6 months from July to December 2010, the model reduced the transportation cost about 9.1% by changing the long-term transportation route without daily vehicle assignment planning.
기업의 사회적 책임 활동이 기업의 가치와 자본비용에 미치는 영향
이용대(Lee, Yongdae),이치송(Lee, Chisongon) 전북대학교 산업경제연구소 2021 아태경상저널 Vol.13 No.1
본 연구는 사회적 책임 활동이 기업가치에 미치는 영향, 자본비용에 미치는 영향에 대해 분석하였다. 분석기간은 2010년부터 2019년도까지이며, 한국기업지배구조원(KCGS)에서 발표하는 ESG 등급을 사회적 책임 활동의 대용변수로 사용하였다. 분석결과 첫째, 기업의 재무적 가치에는 전기의 사회적 책임 활동이 부정적인 영향을 미치는 것으로 나타났다. ESG 통합 등급 뿐만 아니라 환경 등급과 사회 등급도 마찬가지였으며, 지배구조 등급의 경우 당기와 전기의 활동 모두 기업 가치에 부정적인 영향을 미치는 것으로 나타났다. 이는 기업의 재무적 가치에 사회적 책임 활동이 비용으로 인식되어 부(-)의 영향을 미치는 것으로 볼 수 있다. 둘째, 주식가치에 전기의 사회적 책임 활동(ESG 통합등급 뿐만 아니라 환경등급, 사회등급, 지배구조등급)은 긍정적인 영향을 미치는 것으로 나타나 사회적 책임 활동은 장기적으로 기업의 가치에 긍정적인 요인이라는 것을 확인하였다. 셋째, 사회적 책임 활동이 기업의 자본비용에 미치는 영향에 대한 분석 결과 전기의 사회적 책임 활동은 자기자본비용을 증가시키며 타인자본비용은 감소시키는 것으로 나타났다. 본 연구 결과는 사회적 책임 활동이 비용이 아닌 장기적으로 기업의 가치를 상승시키는 요인이라는 것을 주주에게 설득하여 활발하게 수행해야 한다는 것을 제시한다. This study analyzed the effect of CSR(Corporate Social Responsibility) activity on corporate value and cost of capital. The period of analysis is from 2010 to 2019, and ESG ratings announced by the Korea Corporate Governance Service(KCGS) were used as substitutes for CSR activities. The analysis showed that, first, the CSR activities in the prior period had a negative effect on the financial valuation of corporate. The results showed that the environmental and social grades as well as ESG integrated rates had also the same results, and governance ratings show had negative effect on corporate valuation in the current and prior activities. This can be considered that it had negative(-) effect on financial valuation of corporate because CSR activities are recognized as expenses. Second, it was verified that CSR activity is a positive factor in corporate valuation in the long term since the activities for the prior period showed a positive effect on stock value. Third, as a result of the analysis of the effect of CSR activities on capital costs of corporate, the activities in the prior term showed to increase the cost of equity capital and to reduce the cost of debt capital. The results of this study suggests that CRS activity should be carried out actively by persuading shareholders that the activity is a factor to increase corporate value in the long run, not a cost.
Li Jin(리진),Yongdae Lee(이용대),Sheungkown Kim(김승권) 한국경영과학회 2010 한국경영과학회 학술대회논문집 Vol.2010 No.10
Order picking in automotive service parts warehouses is considered as the most labour-intensive operation. Such warehouses contain hundreds of thousands of items but normally 20% of products contribute to about 80% of turnover according to Pareto’s principle of 80-20 rule. Therefore most of fast moving items are located near outbound area which is called “Golden Zone”. Order picking routing efficiency is related to productivity and labor cost. However, most companies use simple methods. This study compares various routing heuristics in the automotive service parts warehouse. We focus on examining the influence of golden zone on routing method selection and present a practical case study.