• 한국시뮬레이션학회논문지
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• 제23권4호
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• pp.9-19
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• 2014

완성차의 빠르고 안전한 납기를 위해 자동차 업계는 많은 노력을 기울여 왔다. 생산 후 선적까지 완성차가 조립공장내에 체재하는 시간의 감축을 통해 총 주문시간을 줄일 수 있음과 동시에 총수송비용 또한 줄일 수 있다. 전통적인 선적계획법들은 조립공장내에서 발생하는 동적인 사건들을 다루는데 한계가 있다. 본 논문은 이러한 선적과정중에 발생할 수 있는 동적 사건들을 해결하는 다중 에이전트 기반 선적 방법을 제시하고 있다. 시뮬레이션을 이용한 실험 결과를 통해 이러한 방법이 주문시간, 작업효율, 품질 및 수송효율의 증진을 가져올 수 있음을 보였다.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.145-152
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• 2022

Recently, interest in the precast concrete (PC) construction method has been increasing. The PC construction process consists of i) design, ii) production, iii) transportation, and iv) installation. A PC field manager at the site submits a shipment request form to the factory one to three days before the installation of the PC component. Numerous matters should be considered in writing a shipment request form. Incorrect shipment request forms may cause standby resources, waste of resources, premature work conclusion, or excessive work. These issues can lead to an increase in construction costs, replanning of PC component installation, or rework. In order to prevent such problems, PC component installation should be simulated based on the shipment request form. Accordingly, this study aims to identify factors influencing the operability of shipment request forms for PC construction. To this end, this study derived factors influencing i) initiation of the activity, ii) addition or deletion of activities, and iii) an increase or decrease in the activity execution time. As a result, this study identified flow, the features of PC components, condition of PC components, unloading location, installation location, input equipment and labor, number of anchors, number of supports, weather, strike, and accident. Further studies should verify the factors derived in this study based on focus group interviews.

• 무역학회지
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• 제47권5호
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• pp.59-74
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• 2022

The exemption clause of recurring shipments refers to the insurer's exemption in Short-term Export Credit Insurance for the additional shipment which was shipped on board while any foregoing shipment was unpaid beyond its due date over 30 days. The recurring shipments are constituted with two factors: the due date of the foregoing shipment and the shipment date of the additional export. The exemption clause of recurring shipments has been eased by extending the grace period for payment up to 60 days from 30 days for the transactions between exporters and importers having the history of payments which were made customarily in delay. This research argues that the current grace period is for the buyers who customarily delay their payments, and that the insurer introduce a grace period for shipment in favor of exporters for the additional shipment which was delayed in on-boarding due to reasons beyond the control of exporters. In consideration of the waiting time and the on-boarding time at ports for container freight, shipments are frequently delayed, which entails those shipments to be indemnified by the exemption clause of recurring shipments. Roll-overs and Blank Sailings also cause the container freight to be delayed in on-boarding. This research is expected to contribute to further development of Short-term Export Credit Insurance in K-SURE.

• 수산경영론집
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• 제40권3호
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• pp.69-88
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• 2009

This research was as part of restocking project conducted until 1986. The necessity of its economic and scientific verification on restocking project increased. The economic analysis of this project was intended to measure its effectiveness of rockfish restocking throughout certain water areas. The rockfish restocking in 2008 was carried two regional governments of Gyeongnam and Busan. 3-year average annualized performance is 3.76 million rockfish restocked and 940 million won invested. As Gyeongnam restocked 3.62 million rockfish and invested 890 million won, most of rockfish stocking accomplished in Gyeongnam. The public shipment was the 3-year average amount was about 400 tons. Each Suhyup shipment as follows; TongYong 66.6 tons, Namhae 23.6 tons, Samcheonpo 17.2 tons; Yeosu 13.3 tons, Geoje 4.7 tons, Goseong 3.1 tons, Hadong 1.0 tons. The private shipment was assessed by the interview of relevant market participations. The high percent areas of public ship were Nemaha, Goseong 90% and Geoje 80% or more. Hadong and Samcheonpo were about 50%. TongYong was 10% and the lowest. The private shipment was calculated using the percentage of private shipment surveyed. The total amount of private shipment was 4.8 billion, where 4.5 billion was TongYong, where most of private shipment is being made. The positive economic benefit occurred when the percent of restocked is over 15% in the overall catch. The percentage of restocked investigated with genetic test was 58.2%. With 58.2% ratio of restocked, there was 3.8 times economic benefit according to approximately 3.6 billion won. Economic effects were highly significant. As catch increased according restocking, joint market commission increased. Joint market commission was calculated as total restocked shipment multiplied by the ratio of commission, the calculated commissions were as follows; Hadong 5.0%, Geoje 4.8%, Goseong 4.8%, Namhae 4.8%, Samcheonpo 4.3%, Yeosu 4.3%, TongYong 4.0%. According to calculation results, annual commission fee of ￦60,000,000 was raised during 2006~2008. The fishing catch bulk for entertainment significantly increased in sea area carried with mass restock.

• 한국경영과학회:학술대회논문집
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• 한국경영과학회/대한산업공학회 2003년도 춘계공동학술대회
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• pp.1-7
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• 2003

This paper considers an Integrated one-vendor multi-buyer production-inventory model where the vendor manufactures multiple products In lot at Her associated finite production rates In the model. It is allowed for earth product to be shipped In lot to the buyers before the whole product production is not completed yet. Each product lot is dispatched to the associated buyer In a number or shipments. The buyers consume their products at fixed rates. The objective is to the production and shipment schedules in the Integrated system. which minimizes the mean total annual cost per unit time. The mean total annual cost consists or production setup cost inventory holding cost and shipment cost. For the model, an Iterative optimal solution procedure with shipment consolidation policy incorporated is derived. It is then tested through numerical experiments to show how efficient and effective He shipment consolidation policy is.

• 경영과학
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• 제31권3호
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• pp.13-26
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• 2014

This paper considers an integrated one-vendor multi-buyer production-inventory model where the vendor manufactures multiple products in lot at their associated finite production rates. In the model, it is allowed for each product to be shipped in lot to the buyers even before the whole product production is not completed yet. Each product lot is dispatched to the associated buyer in a number of shipments. The buyers consume their products at fixed rates. The objective is to the production and shipment schedules in the integrated system, which minimizes the total cost per unit time. The total cost consists of production setup cost, inventory holding cost and shipment cost. For the model, an iterative optimal solution procedure with shipment consolidation policy incorporated. It is then tested through numerical experiments to show how efficient and effective the shipment consolidation policy is.

• 한국산업보건학회지
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• 제24권4호
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• pp.471-477
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• 2014

Objectives: This study was conducted to evaluate area exposure of airborne dust and organic gas during entrance and shipment of chicken in poultry farms Methods: Total dust was measured with NIOSH method 0500. The volume of distributed dust and organic gas(Ammonia, TVOC, Hydrogen Sulfide) were measured using direct reading instrument. Results: The range of concentrations of total dust in area sample was $0.07{\sim}4.91mg/m^3$ during the entrance of chicks and $4.37{\sim}9.4mg/m^3$ during shipment respectively. Concentration of ammonia reached approximately 9 ppm during shipment. There was a difference of concentration of total dust in the area sample between shipment and entrance tasks. Conclusions: It was found that the development of a special intervention program by type of task should be considered for reducing respiratory health effects among poultry farmers.

• 한국산학기술학회논문지
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• 제19권7호
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• pp.214-221
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• 2018

본 연구의 목적은 노지감귤의 출하구조를 순별, 월별로 구분하여 분석한다. 이를 위해 노지감귤의 가격신축성함수를 추정, 분석함으로써 어떻게 출하조절을 하는 것이 노지감귤농가의 소득을 안정시키고, 증대시킬 수 있는지를 모색하고, 이에 따른 정책적 함축성을 도출하는 것이다. 노지감귤 출하물량 1% 증가에 따른 순별 가격신축성은 시기에 따라 상이하게 나타나고 있는데, 10월 하순에서 1월 초순까지의 하락폭이 큰 것으로 나타나 이 시기의 출하조절의 필요성이 크다. 품질이 떨어지는 해를 나타내는 더미변수인 DUM_Q의 부호는 (-)이고, 통계적으로 유의미한 결과를 보여주고 있다. 설날 연후 7일 이상이 2월에 들어있는 해를 나타내는 더미변수인 DUM02의 10월 초순부터 1월 하순까지의 부호가 (-)를 보이고 있다. 이는 설날이 1월에 있는 경우보다 2월에 있는 경우가 물량증대에 따른 하락폭이 크다는 것을 나타낸다. 노지감귤의 출하물량 1% 증대에 따른 월별 가격신축성은 상이하게 나타나고 있는데, 10월에서 12월까지의 하락폭이 큰 것으로 나타나 이 시기의 출하조절의 필요성이 요구된다. 품질이 떨어지는 해를 나타내는 더미변수인 DUM_Q의 부호는 (-)이고, 통계적으로 유의미한 결과를 보여주고 있다. 설날 연후 7일 이상이 2월에 들어있는 해를 나타내는 더미변수인 DUM02의 10월부터 1월까지의 부호가 (-)를 보이고 있다. 이는 설날이 1월에 있는 경우보다 2월에 있는 경우가 물량증대에 따른 하락폭이 크다는 것을 나타낸다. 그리고 순별 및 월별 가격신축성함수의 더미변수인 DOM_Q와 DUM02의 부호가 음(-)을 보인다는 것은, 품질이 좋은 해보다 품질이 나쁜 경우에, 그리고 설날이 1월에 있는 경우보다 2월에 있는 경우에 출하조절의 필요성이 더 중요함을 의미한다.

• 산업공학
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• 제13권3호
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• pp.471-478
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• 2000

One of the most important problems encountered by parcel transportation firms or LTL (Less-than-truckload) firms is the planning of daily linehaul operations. The transportation firm's goal is to determine the most efficient way to move all freight from its originating terminal to its destination terminal after each shipment is picked up from the shipping dock. The purpose of this study is to design a transportation system and develop an efficient scheduling algorithm for linehaul operations carrying small amount of shipment. This paper presents three approaches for efficient linehaul operations. The first approach examines drivers using the roundtrips which start from a terminal, visit several terminals, and return to the starting terminal. The second approach uses a freight assembly center where drivers take freight for a number of destination terminals which they then swap for freight for their starting terminal. The third approach is similar to the second approach in that it uses a transshipment point like a freight assembly terminal for shipment, but it has several transshipment points since each shipment may have a different transshipment point. In this study, we developed a mathematical formulation and algorithm for each approach. The experimental results using data of a LTL firm show that the third approach is more efficient than the other two. Mileage and overnight stays of the third approach are reduced by 10% and 30%, respectively.

• 한국국방경영분석학회지
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• 제10권2호
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• pp.43-49
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• 1984

This paper deals with a transportation problem with two objectives, that is, transportation cost and vital-route shipment. In the transportation problem minimizing cost is sometimes conflicting minimizing vital-route shipment. This paper develops an algorithm finding paneto-optimal solutions in minimizing vital-route shipment and cost, and also presents theoretical backgrounds for developing an algorithm.