• Industrial Engineering and Management Systems
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• 제9권1호
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• pp.28-40
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• 2010

One of the most important objectives of the schedules in a container terminal is to minimize the ship operation time, which consists of discharging and loading operation times. Recently, dual cycling techniques have been used for improving terminal operations, especially for reducing the total empty trips of handling equipment. The main focus of this study is to reduce the empty trip times of yard trucks with minimum delays for ship operations. A heuristic algorithm, modified from a previous algorithm, is proposed to solve this problem. A simulation study is conducted to evaluate the effect of different types of discharging and loading schedules and different locating methods for discharging containers in terms of the performance of the system, including the percentage of the dual cycle operations of yard trucks.

• 한국CDE학회논문집
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• 제14권6호
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• pp.424-433
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• 2009

In order to improve productivity and efficiency of ship production process, production technology converged with Information Technology can be considered. Mid-term scheduling based on long-term schedule of ship building and execution planning based on short-term production schedule have an important role in ship production processes and techniques. However, data used in the scheduling are from the experiences of the past, cognitive, and often inaccurate, moreover the updates of the data by formatted documents are not being performed efficiently. This paper designs the tracking and monitoring system for the curved plates forming process with shop level. At first step to it, we redefine and analyze the curved plates forming process by using SysML. From the definition and analysis of the curved plates forming process, we design the system with respect to operational view considering operational environment and interactions between systems included and scenario about operation, and with respect to system view considering functionalities and interfaces of the system. In order to study the feasibility of the system designed, a prototype of the system has been implemented with 13.56 MHz RHD hardware and application software.

• 한국항해학회지
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• 제8권1호
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• pp.1-16
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• 1984

The economical property of a shipping enterprise, as well as other transportation industries, is determined by the difference between the freight earned and expense paid. This study can be regarded as a division of optimizing ship allocation to routes under the integrated port transport system. Fleet planning and scheduling require complicated allocations of cargoes to ships and ships to routes in order to optimize the given criterion function for a given forecast period. This paper deals with the optimum ship allocation problem minimizing the operating cost of ships in a shipping company. Optimum fleet operating for a shipping enterprise is very important, since the marine transportation is a form of large quantity transport requiring long-term period, and there is a strong possibility to bring about large amount of loss in operation resulting from a faulty ship allocation. Where there are more than one loading and discharging ports, and a variety of ship's ability in speed, capacity, operating cost etc., and when the amount of commodities to be transported between the ports has been determined, then the ship's schedule minimizing the operating cost while satisfying the transport demand within the predetermined period will be made up. First of all a formula of ship allocation problems will be established and then will be constructed to solve an example by the Integer Programming application after consideration of the ship's ability, supply and demand of commodity, amount of commodity to be transported, operating costs of each ship etc. This study will give good information on deciding intention for a ship oprator or owner to meet the computerization current with shiping management.

• 한국전자통신학회논문지
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• 제17권1호
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• pp.167-172
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• 2022

현재 광양항을 비롯한 수출입 항만에서 선박의 관제, 예선, 도선 작업은 선사와 상관없이 입출항 순서 등과 같은 요소에 따라 공동 배선제로 운영되고 있다. 또한, 이것마저도 수작업에 의해서 매우 비효율적으로 이루어 지고 있다. 따라서 선박의 접·이안 등에 대한 업무의 표준화와 디지털화를 통하여 항만 및 선박 운용의 효율성을 높이기 위한 시스템의 개발이 절실히 요청되고 있다. 본 연구에서는 선박의 위치정보, 도예선 스케쥴, 입출항 운영정보, 기상정보 등과 같은 빅데이터에 기반한 스마트 항만 운용시스템을 설계하여 항만 및 선박 운용의 효율성을 높이는 방안을 제시하였다.

• 한국항해항만학회지
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• 제30권1호
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• pp.23-27
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• 2006

우리나라의 해양계열 대학교 실습선은 적절한 계획에 의하여 연안항해 및 원양항해를 실시하고 있다. 그러나 이러한 연안항해 및 원양항해가 과연 학생들에게 어느 정도의 교육효과가 있는지에 대한 연구는 없다. 이러한 교육효과에 대한 첫 번째 연구인 본 연구는 실습선 운항일정(운항기간)에 의하여 실습교육 효과를 파악하고 분석하여 효율적인 실습교육에 기초 자료로 제공하고자 한다. 이 연구를 수행하기 위하여 2005학년도 1학기 한국해대 실습선 한바다호에 승선한 학생들을 대상으로 실습기간별 평가를 6회에 걸쳐 실시하였으며 평가방법으로는 해기교육 평가와 관련한 3급 항해사 문제집에서 무작위로 선별하여 평가를 하였다. 평가 결과에 따르면 학부의 학점이 우수한 학생들의 평가점수가 좋은 것으로 분석되었으며, 평가기간에 따라서는 원양항해실습이 종료된 직후의 평가점수가 가장 뛰어난 것으로 나타났다. 또한 실습기간의 증가에 따라 각 개인의 해기취득 능력차이가 많은 것으로 분석되었다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2005년도 추계학술대회 논문집
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• pp.83-88
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• 2005

우리나라의 해양계열 대학교 실습선은 적절한 계획에 의하여 연안항해 및 원양항해를 실시하고 있다. 그러나 이러한 연안항해 및 원양항해가 과연 학생들에게 어느 정도의 교육효과가 있는지에 대한 연구는 없다. 이러한 교육효과에 대한 첫 번째 연구인 본 연구는 실습선 운항일정(운항기간)에 의하여 실습교육 효과를 파악하고 분석하여 효율적인 실습교육에 기초 자료로 제공하고자 한다. 본 연구를 수행하기 위하여 2005학년도 1학기 한국해대 실습선 한바다호에 승선한 학생들을 대상으로 실습기간별 평가를 6회에 걸쳐 실시하였으며 평가방법으로는 해기교육 평가와 관련한 3급 항해사 문제집에서 무작위로 선별하여 평가를 하였다. 평가 결과에 따르면 학부의 학점이 우수한 학생들의 평가점수가 좋은 것으로 분석되었으며, 평가기간에 따라서는 원양항해실습이 종료된 직후의 평가점수가 가장 뛰어난 것으로 나타났다. 또한 실습기간의 증가에 따라 각 개인의 능력차이가 많은 것으로 분석되었다.

• 천문학회보
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• 제37권2호
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• pp.195.1-195.1
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• 2012

Korea Aerospace Research Institute has developed an earth observation satellite whose primary mission objective is to provide high resolution electro optical earth images for Geographical Information Systems (GIS) establishment and the applications for environmental, agriculture and ocean monitoring. It was successfully launched into its mission orbit by using a commercial launch vehicle on 18th of May, 2012. This paper describes a series of launch activity at the launch site including its transportation to the launch site. Before conducting the launch site operation, satellite operation plane was prepared. Combining the satellite operation plan and launch vehicle activities, an integrated launch site operation plan and schedule have been drawn up. After arrival of the spacecraft at the launch site, post-ship check out has been conducted. And then it was fuel loaded and integrated with launch vehicle hardware. After completion of final electrical check out, count down procedure was executed. on 18th of May, it was launched into the space and was separated from the launch vehicle as planned. About 3 months of early operation and calibration/validation, now the satellite is conducting its normal mission.

• 한국경영과학회지
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• 제38권3호
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• pp.13-22
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• 2013

Queueing system with scheduled arrivals is useful in many fields where both customers' waiting time and servers' operation time (utilization) are important, and arrival time of customers is possible to be controlled. In this paper, we analyzed the operation of ship maintenance with the queueing system with scheduled arrival. Based on the model presented by Pegden and Rosenshine [8], who dealt with exponential service time, we extended the service time distributions to phase-type distribution which is able to include a wide range of real stochastic phenomena. Since most activities in the military are carried out under tight control and schedule, scheduled arrival queue has quite good applicability in this area. In this context, we applied queue with scheduled arrival to the optimal booking time decision for the ship maintenance in the navy.

• 대한산업공학회지
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• 제41권1호
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• pp.1-9
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• 2015

In shipbuling processes, a quay wall is a major resource for additional operations after an erection operation at dock. A quay wall is becoming a new bottleneck instead of docks, while ship types with long operation time at quay wall are increasing recently. We developed a quay wall scheduling algorithm for the quayside operations of ships in this paper. The objective function is to minimize the sum of not assigned days of ships which have to be assigned to any quay wall under limited numbers of quay walls. The scheduling algorithm is based on an assignment method to assign each ship to a quay wall among its alternative quay walls at the time of launching or moving to another quay wall. The scheduling algorithm is also using Tabu Search algorithm to optimize assignment sequence of ships. The experiment shows that the algorithms in this paper are effective to make schedule of the quayside operations of ships.

• 경영과학
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• 제29권2호
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• pp.143-155
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• 2012

The purpose of this study is to formulate and solve the scheduling problem to heat-treatment process in forging process and apply it to industries. Heat-treatment is a common process in manufacturing heavy forged products in ship engines and wind power generators. Total complete time of the schedule depends on how to group parts and assign them into heat furnace. Efficient operation of heat-treatment process increases the productivity of whole production system while scheduling the parts into heat-treatment furnace is a combinatorial problem which is known as an NP-hard problem. So the scheduling, on manufacturing site, relies on engineers' experience. To improve heat-treatment process schedule, this study formulated it into an MIP mathematical model which minimizes total complete time. Three methods were applied to example problems and the results were compared to each other. In case of small problems, optimal solutions were easily found. In case of big problems, feasible solutions were found and that feasible solutions were very close to lower bound of the solutions. ILOG OPL Studio 5.5 was used in this study.