• 산업공학
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• 제13권4호
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• pp.564-571
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• 2000

Manufacturing companies are implementing a so-called customer-centered supply chain management to have a competitive advantage. In these efforts, collaboration not only within a company but also with suppliers, partners and customers is emphasized. The fast delivery, reducing the total lead-time from development to delivery, is pursued more than ever, though the quality and cost are still importantly regarded. Die manufacturing companies are not exception from these trends, because a die is a necessary tool for almost manufacturing industries. The planning and scheduling system plays an important role in supply chain management. In this study, we address a scheduling problem of a die manufacturing company. The problem is very complex due to many reasons including the uncertainty in environment and the complexity of constraints. Considering the importance of due-date satisfaction and human planners' roles, we designed the solution algorithm and the user interface respectively. In the implementation phase, modeling constructs and basic solution algorithms of ILOG solver and ILOG scheduler are used. In the paper, the problem and the algorithm are described with ILOG constructs, and the experience of use is also addressed.

• 산업기술연구
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• 제26권A호
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• pp.173-180
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• 2006

Scheduling for shipbuilding processes has many alternative solutions since it has long time horizon and handles many jobs. In this paper, an shipbuilding scheduling system for outfitting and painting is presented based on constraint satisfaction techniques(CST). We provide a field based model and an efficient solution methodology by using ILOG Scheduler and Solver. ILOG Solver support extensive optimization goals easily. We do verify the improvement and efficiency of the schedule generated by the scheduling system presented in this paper.

• 산업공학
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• 제12권3호
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• pp.362-373
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• 1999

Resource Constrained Dynamic Multi-Projects Scheduling (RCDMPS) is intended to schedule activities of two or more projects sequentially arriving at die shop under restricted resources. The aim of this paper is to develop a new problem solving method for RCDMPS to make an effect schedule based by constraint programming. The constraint-based scheduling method employs ILOG Solver which is C++ constraint reasoning library for solving complex resource management problems and ILOG Schedule which is a add-on library to ILOG Solver dedicated to solving scheduling problems. And this method interfaces with ILOG Views so that the result of scheduling displays with Gantt chart. The scheduling method suggested in this paper was applied to a company scheduling problem and compared with the other heuristic methods, and then it shows that the new scheduling system has more preference.

• 산업경영시스템학회지
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• 제24권65호
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• pp.89-102
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• 2001

In this paper, the aircraft route scheduling consists of two steps; the pairing generation and the aircraft assignment. The pairing generation is heuristic approach how flights construct pairings from and to the main base. The aircraft resource assignment which is to establish a aircraft route schedule is constructed by constraint satisfaction problem technique. ILOG solver and schedule is used to solve this problem. In addition, a aircraft route reschedule process against departure-arrival delay or aircraft maintenance schedule change is added by partial constraints satisfaction problem technique. Also, Gantt chart made by ILOG views is used to show aircraft route schedule results more easily.

• 산업기술연구
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• 제22권B호
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• pp.61-70
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• 2002

The shipbuilding scheduling has many possible alternatives because of its long time horizon and a lot of jobs, so it is required that the scheduling system can generate and search feasible alternatives rapidly. The scheduling in the assembly shop is initiated by allocating, namely loading, the assembly blocks to each shop. In this step, the resource capacities (such as available man/hour, available crane) of each shop must be considered. The result of loading without above consideration can make the scheduling result based on that infeasible or worse one. In this paper, we developed the optimal scheduling system of shipbuilding, specifically for loading and scheduling of assembly block, using ILOG Solver/Scheduler. ILOG Solver/Scheduler is a general-purposed commercial software which supports to find a feasible or optimal solution using object oriented technique and constraints satisfaction programming, given constraints and objectives. Also, in order to enhance the system performance, we conducted various experiments of ILOG search strategies. The experimental results showed that the impact of search strategies is significant.

• 산업기술연구
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• 제27권A호
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• pp.69-76
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• 2007

The body of an excavator, one sort of the construction equipment, consists of mainframe part, track frame part, boom part and arm part. The all parts are manufactured in the body welding operation. The scheduling in the body welding operation of a construction equipment manufacturing is to take all the various constraints into consideration. The offset time, due date, daily capacity of operations, daily jig's capacity, precedence relation, outsourcing, alternative resource and all of the shop floor environment should be considered. An APS(Advanced Planning & Scheduling) system is a proper and efficient system in such circumstance. In this paper, we present an APS system, the optimal scheduling system for the construction equipment manufacturing specifically for the body welding operation, using ILOG Solver/Scheduler. ILOG Solver/Scheduler is a general purposed commercial software which supports to find a feasible or optimal solution using object oriented technique and constraints satisfaction programming, given constraints and objectives.

• 한국철도학회논문집
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• 제8권5호
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• pp.391-397
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• 2005

In this paper we present a model for the maintenance routing construction and the trainset allocation (maintenance routing problem). The model solves the maintenance routing problem using column generation algorithm which was used to combine constraint programming and linear programming. Ilog-cplex was used to solve the linear programming model and Ilog-solver was used to solve the constraint programming model. The computational experience is also provided.

• 한국항해항만학회지
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• 제28권1호
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• pp.83-90
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• 2004

경비, 훈련, 지원 등의 해상 임무를 종료한 해군 함정은 차기 임무를 준비하기 위해 모항에 입항하여 긴급수리, 유류수급, 무장 적하역, 크레인, 태세유지, 수리, 포 배열, 탄약적재, 부식 작업 등의 일련의 서비스를 필요로 한다. 본 연구에서는 한정된 선석과 설비 자원 하에서 여러 함정에 대한 효율적인 선석 할당 계획의 수립을 목적으로 한다. 이를 위해 불필요한 선석이동을 줄이고 계획기간 동안 각 함정이 필요로 차는 서비스를 점수화한 총점을 최대화하는 기존의 모형을 토대로, 서비스 지속 기간이 제한적이고 서비스들 간의 전후 우선순위가 존재하는 현실적인 제약을 고려하면서 전비태세를 향상시킬 수 있는 혼합 정수 계획 모형(Mixed Integer Programming)을 수립해 보았다. 효과적인 분석을 위하여 ILOG OPL(Optimization Programming Language) Studio 3.1을 사용하여 모델링 한 후 ILOG CPLEX 7.0으로 최적해를 구해 보았다. 본 연구에서 제시한 모형이 해군 함정의 효율전인 선석 할당 계획 수립에 적용될 수 있다면 해군 부대의 전비태세 향상에 기여를 할 수 있을 것으로 생각된다.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 2001년도 춘계 학술대회 논문집
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• pp.143-143
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• 2001

조선 산업에서의 이익 극대화를 위해서는, 공기 단축을 통한 매출 증대, 주어진 생산 자원(인력, 설비 등)의 효율적인 이용을 통한 생산비 절감이 필수적인 사안이다. 다시 말하면, 효율적인 자원의 이용으로 선박의 건조 공기를 줄임으로써 조선 산업에서의 이익 극대화를 도모할 수 있고 이는 효과적인 생산 계획과 관리를 통해 얻을 수 있다. 조선 산업에서의 생산 계획과 관리는 내업, 선행, 선내 등 선박 건조의 전 과정에서 이루어지고 있는데, 조선 산업은 타 산업에 비해 환경변화에 따른 단기간의 불확실성은 비교적 적은 반면에, 가공, 절단, 조립, 의장, 도장, 선행탑재, 탑재, 안벽 작업 등 다단계 제조 프로세스가 장기간에 걸쳐 상당히 복잡하게 구성되어 있다. 또한, 유연하게 적용할 수 있는 인적자원과 공정순서, 그리고 각종 시간적 공간적 자원 제약 등으로 인하여 효과적이고 일관된 생산 계획을 신속하게 수립하기가 어려울 뿐만 아니라, 주문 생산 방식이기 때문에 정확한 일정계획 데이터의 생성도 어려운 실정이다. 본 연구는, 조선의 혁신적인 생산관리 능력 향상을 지원하기 위한 "조선 통합 생산계획 시스템 개발" 에 관련된 연구이다. 본 연구에서는 조선 생산계획에 적합한 일정계획 방법론 및 엔진 소프트웨어를 활용하고 총체적인 생산계획 및 일정계획 업무의 개념 재정립을 통하여, 통합 최적화를 실시간에 지원하는 조선 최적 일정계획 시스템 구축에 궁극적인 목적을 두고 있다. 이를 위해 본 연구에서는 조선 프로세스와 일정계획 업무규칙을 분석하고 이를 바탕으로 "조선 최적 일정계획 시스템"을 개발하였다. 조선 최적 일정계획 시스템은 블록, PE, 탑재, 선내 단계의 일정계획 최적화와 What-if Simulation을 지원하기 위하여 ILOG Solver/scheduler로 구현하였으며, 구현된 시스템에 대해 실제 계획에서 사용하는 데이터를 대상으로 다양한 최적화 기능에 대한 실험을 실시하였다. 실제 데이터를 이용한 실험결과, 풀이시간과 최적해 측면 모두에서 비교적 만족할 만한 결과를 보여주었다.교적 만족할 만한 결과를 보여주었다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2010년도 춘계학술대회 논문집
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• pp.1177-1190
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• 2010

The high-speed railway track occurs train operating result track irregularity, subsidence of the track, ballast abrasion. This is the unusual condition. High-speed railway track maintenance task is the behavior which repairs unusual section by using the human resource or machine resource. The resource used to maintenance task is restrictive. A resource can be efficiently used if the high-speed railway track maintenance scheduling is used. So the more task can be performed in the fit time. In conclusion, this manages the unusual condition of a track efficiently. So additional expenses is minimized cause by deteriorating unusual condition. And it offers comfortable ride to passenger. However, maintenance scheduling has to reflect well practical situation and environment. That's maintenance scheduling is used. We gather the opinions of the hands-on workers. So in this paper define field situation and condition. And suggest mathematical model about this. And we developed the track maintenance scheduling software engine using ILOG.