• 대한안전경영과학회지
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• 제13권2호
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• pp.267-273
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• 2011

Since 'The Act on Private Investment of The Infrastructure' was established in 1994, private investment as well as government's investment in transport infrastructure has been active. However investment in transport infrastructure has more risks than others' due to uncertainty both in traffic volume and in construction cost. In the current appraisal procedure of deciding transportation infrastructure investment, instead of risk management, the sensitivity analysis considering only the changes of benefit, cost and social discount rate which are main factor affecting economic feasibility is carried out. Therefore the uncertainty of various factors affecting demand, cost and benefit are not considered in feasibility study. In this study the problems in current investment appraisal system were reviewed. Using Delphi technique the major factors which have high uncertainty in feasibility study were surveyed and then improvement plan was suggested in the respective of classic 4 step demand forecasting method. The range estimation technique was also mentioned to deal with the uncertainty of the future.

• 대한안전경영과학회지
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• 제17권3호
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• pp.307-317
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• 2015

This study was to identify the effect of the satisfaction of certification, the educational use of the company offering certificate, the system of confirmation of the same model and the demographic aspect on the companies to see if compulsory certification(KC certificate) has negative effects on company management. First, the satisfaction of certification could reflect positive influences on company management. Second, there is no statistical significance in the education from the company offering certificate as a result of analyzing relationships but education is required and has an effect on improving quality according to the result of frequency analysis. Last, the system to declare by identifying the same model has a difference in significance in sales account, the development of products and warranty service for products.

• 디지털융복합연구
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• 제17권3호
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• pp.79-92
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• 2019

본 연구는 패널회귀분석의 GLS 및 고정효과모형 추정을 통해 내항 화물운송사업의 화물운송수입과 자본, 자산, 영업외 비용, 부채비율이 부채에 어떠한 영향을 미치는지 분석하였다. 이론적 배경을 통한 요인과 가설 설정, 2006년부터 2015년까지 10년간 내항 화물운송사업체의 재무상태표, 손익계산서 자료를 분석한 결과, 자산은 부채에 정(+)의 영향, 자본과 영업외비용, 부채비율은 부채에 부(-)의 영향을 끼치며, 화물운송수입은 영향을 미치지 않는 것으로 나타났다. 이러한 결과는 내항 화물운송사업체가 부채확대로 자산 확보하려는 경향, 은행차입을 통한 이자비용 등 영업외비용을 활용한 부채감소 레버리지 효과 창출, 부채보다 자본을 줄여 부채비율을 하향조정하고 있는 경영특성과 재무적 운영방식을 채택하고 있음을 실증적으로 보여준다. 향후 연구에서는 내항 화물운송업체를 업종별(화물선, 유조선, 예부선), 지역별(서해권, 남해권, 동해권)로 세분화하여 분석할 필요가 있다.

• 유통과학연구
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• 제14권2호
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• pp.41-45
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• 2016

Purpose - Finding an optimal path is an essential component for the design and operation of smart transportation or logistics network. Many applications in navigation system assume that travel time of each link is fixed and same. However, in practice, the travel time of each link changes over time. In this paper, we introduce a new transportation problem to find a latest departing time and delivery path between the two nodes, while not violating the appointed time at the destination node. Research design, data, and methodology - To solve the problem, we suggest a mathematical model based on network optimization theory and a backward search method to find an optimal solution. Results - First, we introduce a dynamic transportation problem which is different with traditional shortest path or minimum cost path. Second, we propose an algorithm solution based on backward search to solve the problem in a large-sized network. Conclusions - We proposed a new transportation problem which is different with traditional shortest path or minimum cost path. We analyzed the problem under the conditions that travel time is changing, and proposed an algorithm to solve them. Extending our models for visiting two or more destinations is one of the further research topics.

• 디지털산업정보학회논문지
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• 제10권3호
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• pp.261-272
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• 2014

Home appliances go through a couple of packaging stages from the plant to consumers. The primary packaging, inner packaging for each part, happens for protection after products leave the plant. The secondary packaging happens in the unit of product, ensuring cushioning packaging to protect products from movement. The final tertiary packaging is for transportation and delivery. Each stage of product packaging, however, costs a lot of money because of disposable packaging materials used in each stage including vinyl, tapes, Styrofoam, and corrugated cardboards. Discarded packaging materials also cause environmental problems. In an effort to come up with a measure to solve those problems, this study proposed a plan to minimize logistics costs with semi-permanent packaging materials to replace disposable ones including Styrofoam, vinyl, and corrugated cardboards in the stages of inner packaging, cushioning packaging, product unit-based packaging, and transportation. The study also developed a model to cut down logistics costs by reducing various packaging stages including the primary, secondary, and tertiary stage only to the secondary one through module-type products instead of the transportation- and delivery-type ones, as well as demonstrated the excellence of the study through numerical analysis.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2001년도 학술대회지
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• pp.387-392
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• 2001

건설 프로젝트의 대형화, 고층화 추세는 자재, 인원 등의 물류량을 증가시켜 양중계획의 중요성을 증대시키고 있다. 이에 본 연구는 타워크레인 계획 프로세스의 개발을 목표로 한다. 이는 후속 연구를 통해 양중계회 지원시스템으로 발전시킬 수 있을 것으로 기대된다. 본 프로세스는 양중대안을 선정하는 프로세스와 평가하는 프로세스로 구분된다. 첫 번째 프로세스는 양중 위치와 물량에 대한 검토를 통해 가능한 크레인의 대수, 종류, 위치의 조합을 만들어낸다. 두 번째 프로세스는 첫 번째 프로세스의 결과물인 각 조합에 대해서 Peak time과 모든 물량의 소화여부를 검토하여 실행가능한 대안들을 만들어낸다. 마지막 프로세스에서는 이들 대안을 대상으로 공기만족도, 비용, 장비 및 작업의 효율성 등을 평가하여 최적의 대안을 선택하게 된다.

• 한국재난관리표준학회지
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• 제1권1호
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• pp.53-62
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• 2008

석유화학 공장에서 화학 물질을 수송하는 탱크로리의 잠재적인 위험(사고의 크기 그리고 영향, 사회적인 위험)이 증가함에 따라 다양한 화학물질에 대한 운송안전 평가기준의 정립과 적극적인 위험성 평가에 관한 연구를 수행하였다. 최대예상사고분석(maximum credible accident analysis) 기법을 적용하여 "첫째 탱크로리를 이용한 취급화학물질의 대표적인 종류와 기준 비교 둘째 잠재위험에 대한 세분화된 구분 셋째 가상 사고 시나리오 파악 및 인식 넷째 가상 사고 시나리오별 위험성평가(정성/정량 - 누출원 모텔링)" 단계적 (4단계) 위험성평가를 통한 위험관리체계를 연구하였다.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2008년도 정기학술발표대회 논문집
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• pp.38-43
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• 2008

한 국가의 SOC 시설 보유량은 공공서비스의 공급능력을 보여주는 지표로 활용되고 있으며, 국가경쟁력의 원천이 되고 있다. 한국은 SOC 시설이 충분하다는 판단하에 '03년 이후 SOC 투자를 점차 축소하고 있다. 하지만 SOC 투자 축소는 기존 SOC 공사의 공기지연이 발생하고 있으며, 향후에는 국가경쟁력을 저해할 가능성을 갖고 있다. 따라서 충분한 수준의 SOC 투자는 지속되어야 한다. 이를 위해 우선 교통시설특별회계를 최소한 국가기간교통망계획의 계획기간인 '19년까지 연장할 필요가 있다. 또한 민간투자사업을 효과적으로 활용하고, SOC 투자를 완공위주의 집중투자를 해야 한다.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2002년도 춘계공동학술대회
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• pp.171-178
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• 2002

At the present time, container transportation plays a key role in the international logistics and the efforts to increase the productivity of container logistics become essential for Korean trucking companies to survive in the domestic as well as global competition. This study suggests an approach for determining fleet size for container road transportation with dynamic demand. Usually the vehicles operated by the transportation trucking companies in Korea can be classified into three types depending on the ways how their expenses occur; company-owned truck, mandated truck which is owned by outsider who entrust the company with its operation, and rented vehicle (outsourcing). Armually the trucking companies should decide how many company-owned and mandated trucks will be operated considering vehicle types and the transportation demands. With the forecasted monthly data for the volume of containers to be transported a year, a heuristic algorithm using tabu search is developed to determine the number of company-owned trucks, mandated trucks, and rented trucks in order to minimize the expected annual operating cost The idea of the algorithm is based on both the aggregate production planning (APP) and the pickup-and-delivery problem (PDP). Finally the algorithm is tested for the problem how the trucking company determines the fleet size for transporting containers.

• 대한조선학회논문집
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• 제45권6호
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• pp.646-655
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• 2008

A main issue about production management of shipyards is to efficiently manage the work in process and logistics. However, so far the management of a transporter for moving building blocks has not been efficiently performed. To solve the issues, optimal block transporting scheduling system is developed for minimizing of the travel distance without overload of a transporter. To implement the developed system, a hybrid optimization algorithm for an optimal block transportation scheduling is proposed by combining the genetic algorithm and the ant algorithm. Finally, to evaluate the applicability of the developed system, it is applied to a block transportation scheduling problem of shipyards. The result shows that the developed system can generate the optimal block transportation scheduling of a transporter which minimizes the travel distance without overload of the transporter.