• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2012년 춘계학술대회
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• pp.159-166
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• 2012

Recently, by the whole world paradigm shift to "Low Carbon Green Growth", it is required to renovate National Transportation and Logistics System. Transportation accounts for 21% of the total energy consumption and 20% of the total $CO_2$ emission, and also places its main reliance on fossil fuels. From green point of view, electric railway system is superior to the other transportation alternatives, but also required to develop the innovative technologies for high efficiency and low energy consumption. In this paper, the concept of railway green operation system by regenerative synchronized driving is presented, including the numerical example and the estimated effect.

• 한국융합학회논문지
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• 제9권7호
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• pp.231-240
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• 2018

자동차 산업은 국제유가 상승, 차량가격 상승 등 다양한 위기에 직면해 있다. 정부 규제완화와 더불어 생산 효율성 증가를 위한 경영개선 노력이 필요하다. 본 논문에서는 조달물류 개선을 목표로 실제 회사에서 사용 중인 요인들을 바탕으로 Fuzzy-AHP-TOPSIS를 활용하여 조달물류 평가모델을 구축하였다. G사 자동차 3개 공장을 평가대상으로 Fuzzy-AHP 분석한 결과, 장기 품질문제 해결, 자재결품 정지시간 최소화, 장비사고 방지, 단기 품질문제 해결이 가장 중요한 요인으로 파악되었다. TOPSIS 분석결과 B공장의 조달물류가 가장 잘 이루어지고 있는 것으로 나타났다. 제시된 평가모델을 사용하여 향후 주기적인 조달물류 관련 평가가 가능하며, 이는 자동차 산업 효율화에 기여할 수 있다는 시사점을 갖는다.

• 대한안전경영과학회지
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• 제18권4호
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• pp.185-193
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• 2016

Now, many studies of industrial field are focusing on the whole optimization of SCM. But, the reason for making simultaneity of the whole system of SCM difficult is reduced scale of studies on ordering area in SCM reducing the complexity. It's an important issue how to allocate orders in the environment of many suppliers under special situation. Through this thesis, this research intends to expect systematic and arranged supply of distribution area which can make a decision while allocating product orders and quantity and maintaining service standard suggested by minimizing total purchase costs.

• 산업경영시스템학회지
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• 제45권4호
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• pp.134-141
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• 2022

Transportation in urban area has been getting hard to fulfill the demand on time. There are various uncertainties and obstacles related with road conditions, traffic congestions, and accidents to interrupt the on-time deliveries. With this situation, the last mile logistics has been a keen issue for researchers and practitioners to find the best strategy of the problem. A way to resolve the problem is to use parcel lockers. Parcel locker is a storage that customers can pick up their products. Transportation vehicles deliver the products to parcel lockers instead of all customer sites. Using the parcel lockers, the total delivery costs can be reduced. However, the inconvenience of customer has to increase. Thus, we have to optimal solution to balance between the total delivery costs and customers' inconvenience. This paper formulates a mathematical model to find the optimal solution for the vehicle routing problem and the location problem of parcel lockers. Experimental results provide the viability to find optimal strategy for the routing problem as well as the location problem.

• 대한산업공학회지
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• 제42권1호
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• pp.38-49
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• 2016

This paper proposes a mathematical model-based solution for sourcing decisions with an objective of minimizing the manufacturer's total cost in the two-echelon supply chain with supply capacity risk. The risk impact is represented by uniform, beta, and triangular distributions. For the mathematical model, the probability vector of normal, risk, and recovery statuses are developed by using the status transition probability matrix and the equations for estimating the supply capacity under risk and recovery statuses are derived for each of the three probability distributions. Those formulas derived are validated using the sampling method. The results of the simulation study on the test problem show that the sourcing decisions using the proposed solution reduce the total cost by 1.6~3.7%, compared with the ones without a consideration of supply capacity risk. The total cost reduction increases approximately in a linear fashion as the probability of risk occurrence or reduction rate of supply capacity due to risk events is increased.

• 대한안전경영과학회지
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• 제12권4호
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• pp.183-190
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• 2010

This paper selects length of berth, area of yard, unloading capacity and number of berth as the input indexes, and cargo turnover as output index to research the source of TFP(Total Factor Productivity) growth of 23 main ports in Korea. The major conclusions are as follows. The TFP of the trade ports in Korea is at the fluctuating stage, but it generally displays a rising trend, and it’s growth originate from the growth of technical efficiency. The Growth rates of TFP of trade ports in the different areas are different, and the sources of growth are also different, but the changing trends are basically the same. Four major factors to the increase of TFP are following: competition between ports, reform of property system, harbor-hinterland economic and international trade, modeling, imitation and innovation in management, technology and system.

• 한국항해항만학회지
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• 제43권6호
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• pp.450-461
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• 2019

According to the results of the management evaluation of the nation's public firms over the past seven years, the rating of the port corporation is generally insufficient. According to the results of the seven-year study 2011-2017, the average debt ratio of the port corporation was 34.5%, two to three times lower than that of the general public company, the operating profit ratio of sales was three times higher, and the value added per person was 1.6-1.9 times better. However, the aggregate score and grade were generally low, with 4.1% of the total number of employees of the general public corporation, 10% of the average total assets, and 1% of the average sales volume. The distributed analysis results and panel return analysis results show that the size significantly impacts the overall score and grade. Additionally, major business standards such as port volume, not controlled by the port corporation, appear to have a decisive influence on the low grade of the port corporation. Thus, it appears that improvement and supplementation of key business indicators of port construction are urgently needed in the management evaluation system, which can be properly controlled.

• Management Science and Financial Engineering
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• 제15권1호
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• pp.1-31
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• 2009

This paper considers the value of warehousing contract under probabilistic demands. We consider a supply chain consisting of a supplier, a retailer and its third-party warehousing partner who provides the warehousing service to the retailer through an outsourcing contract. A typical contract is specified by initial space commitment and modification schedule. The retailer decides the order quantity for the supplier and space commitment for the outsourcing contract. Since there is close relationship between order quantity and space commitment to minimize the total cost including ordering cost, inventory carrying cost, shortage cost, and warehousing cost, we develop an analytical model under probabilistic demands, where the retailer can determine the optimal order size and space commitment level jointly. We found the closed-form optimum for a single-period case and the optimal conditions for a two-period case. To evaluate the value of contract flexibility for the two-period case, we compared the total cost under two policies; one with modification, under which the base commitment can be changed at the start of each period and the other without modification. From results of our numerical analysis, we showed that the modification policy is more cost-effective as the variability of demand increases.

• 융합경영연구
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• 제9권3호
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• pp.11-21
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• 2021

Purpose: The purpose of this study is to understand the status quo of production efficiency in private industrial enterprises above designated scale in China's 31 provinces (including municipalities directly under the central government, autonomous regions) (hereinafter referred to as China's 31 provinces). Research design, data and methodology: Find out the factors affecting the development of production efficiency in private industrial enterprises, using DEA, Data Envelopment Analysis and Malmquist index analysis, build the evaluation model of production efficiency in private industrial enterprises, and analyze the data of China's 31 provinces private industrial enterprises in 2015-2019. Results: The research results show that the production efficiency of private industrial enterprises in China is improving on the whole. Although the total factor productivity has decreased slightly, the overall efficiency and pure technical efficiency have increased significantly. Conclusions: The conclusion of this study can provide reference for Chinese private industrial enterprises to improve production efficiency and make development plan. The limitation of this paper lies in the fact that the private industrial enterprises in inefficient provinces have not been given specific improvement plans.

• 한국항만경제학회지
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• 제39권2호
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• pp.143-163
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• 2023

본 연구는 ESG 활동이 국내 물류기업의 기업성과에 미치는 영향을 분석하고자 한다. 이를 위해 ESG 활동을 도입하고 실행하는 데 영향을 미치는 요인을 분석하고, ESG 활동이 기업의 신뢰와 이미지를 향상시키는 정도를 파악하여 ESG 실행이 물류 기업의 기업 성과에 어떤 영향을 미치는지 실증적으로 분석하였다. 국내 물류기업 종사자를 대상으로 구글 설문지를 이용하여 온라인 설문조사를 실시하였고, 그중 총 463부의 데이터를 통해 Smart PLS 4.0 프로그램을 이용하여 PLS 구조방정식 분석을 실시하였다. 연구 결과는 다음과 같다. 첫째, 외부압력인 정부압력은 환경적 책임활동, 투자자 압력은 사회적 책임활동과 거버넌스 책임활동에 유의미한 영향을 미친다. 내부압력인 경영자는 환경적 책임활동에, 임직원은 ESG책임활동 모두에 영향을 미친다. 둘째, 환경적 책임활동은 기업이미지에 영향을 미치며, 사회적 책임활동과 거버넌스 책임활동은 신뢰와 기업 이미지 모두에게 영향을 준다. 셋째, 신뢰와 기업이미지는 재무적 성과와 비재무적 성과 모두에게 유의미한 영향을 준다. 넷째, 사회적 책임활동과 거버넌스 책임활동이 비재무적 성과에 연결되는 경로에서 신뢰는 유의미한 매개효과를 가지며, ESG 책임활동이 재무적 성과와 비재무적 성과에 연결되는 경로에서 이미지는 모두에게 유의미한 매개효과를 가진다. 본 연구의 기여는 물류 기업들이 ESG 활동을 적극적으로 추진하여 환경, 사회, 거버넌스 측면에서 책임적인 기업 이미지를 구축하고 고객들의 신뢰를 얻을 수 있는 방법에 대해 제시하고 있다는 점이다. 이를 통해 물류 업계의 ESG 활동에 대한 인식을 높이고, 지속 가능한 경영을 위한 중요성을 인식할 수 있도록 도움을 주고자 한다.