year 1997 
author Sangbok Woo 
Keyword Integrated System, Loading, Tool allocation, Scheduling, Flexible Manufacturing System, Flexibility 
Abstract A Flexible Manufacturing System( FMS ) is an automated manufacturing system which pursues both the productivity of a transfer-line and the flexibility of a job shop simultaneously. In particular, the flexibility of FMS has been recognized as a major element for responding to dynamics of market environment and uncertainties of shop floor. In spite of such an importance, there were few researches which dealt with the effective use of flexibility throughout the production planning and scheduling of FMS. In order to efficiently utilize the flexibility of FMS, it is important to make a pertinent plan for the alternative machines in a given planning horizon. But, this is very complex because we should consider loading and tool-allocation constraints in production planning as well as precedence constraints in scheduling.

There were some researches which divided entire problems into two subproblems - loading and scheduling - and solved them hierarchically. Even a subproblem, however, it is too difficult to find an optimal solution in real time and to establish a relevant goal of the loading problem corresponding with the scheduling performance.

In this thesis, we attempt to solve the loading and scheduling problems of FMS in an integrated manner. So we propose an integrated system and its solution methodologies which can use the flexibility of FMS effectively, and make a decision about tool allocation, machine selection, and sequencing altogether.

The proposed system consists of two main modules, ´schedule generating module´ which makes partial schedules and ´tool-allocation checking module´ which investigates the feasibility of tool-allocation for unscheduled tasks. With interacting two modules, we settle the loading and scheduling problems. In the schedule generating module, we assume FMS scheduling problems as having multiple identical parts and alternative machines. According to characteristics of alternative machines, we classify the schedule generating module into three submodules - identical machines submodule, exclusive machines submodule, and non-identical machines submodule. In the identical machines submodule, we propose an optimal algorithm, a modified nondelay schedule generator which eliminates many duplicating partial schedules not affecting an optimal makespan solution, and show the validity and efficiency of the algorithm by theorems and experiments. In the exclusive machines submodule, we propose some dispatching rules which consider precedence relationships among multiple identical parts, and show the effectiveness of rules by experiments. In the non-identical machines submodule, we propose an schedule generating algorithm which is based on estimated workloads, and some dispatching rules which is devised to efficiently use the non-identical alternative machines, and show the superiority of proposed algorithms and rules by experiments. The schedule generating module can be used independently of the tool-allocation checking module in cases that constraints related to the tool-allocation become meaningless due to the introduction of an automated tool delivery system or a sufficient tool magazine, etc.

In the tool-allocation checking module, we propose a heuristic and a lagrangian relaxation method as well as optimization models. So, it is possible to solve real problems in allowed time limit. The tool-allocation checking module can be used as not only a submodule which solves the loading and scheduling problem, but also a means which indicates the production feasibility of parts selected initially or added in a given tool-allocation status. Experimental results show that in most cases the proposed integrated approach outperforms existing hierarchical approaches in the scheduling performance and the computational time required. In addition to that, the difference between two approaches tends to increase when the number of part types and the number of alternative machines increase and the tool constraints become tight. So, the results show that the proposed approach is very useful for practical problems. 
c PhD 

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번호 c year 제목 author
61 MS  2003  Production Planning and Distribution Planning using Demand based mixed Genetic Algorithm in a Supply Chain Jung Im 
60 MS  2003  Design of a BOF Blowing Control Model Using Artificail Intelligence Jungjoon Park 
59 PhD  2003  Process Modeling and Performance Analysis Methodology toward Optimal Design of Manufacturing Systems [30] Kichang Lee 
58 PhD  2002  Flexible Job Shop Scheduling with Multi-level Job Structures [16] Yangja Jang 
57 MS  2002  A combined DEA and BSC methodology for evaluating organization efficiency [1] Bumsoo Kim 
56 MS  2002  Design and Implementation of Model Management System for Supply Chain Planning [1] Youngcheol Yang 
55 MS  2001  A Study on Components Development for Production Management Daiki Min 
54 MS  2001  A Study of Decision Support for the implementation of Cellular Manufacturing Systems. [1] Muynghee Byun 
53 MS  2000  A Study on Integrated Production Planning of Distributed Manufacturing Systems on Supply Chain Dosung Go 
52 MS  2000  Job Shop Scheduling for Minimizing the Sum of Earliness and Tardiness Dongsu Park 
51 MS  2000  Design of a Hybrid System in Integrating Kanban with MRP [2] Taeyoung Song 
50 MS  2000  A Study on Work Measurement Using Image Processing [8]
49 MS  1999  A Study on the Implementation of the Speech Recognition System for the Real-Time Decision Support of Manufacturing Cells [18] Eoksu Sim 
48 MS  1999  A Study on the Development of Event-driven MRP Components Considering Capacity Constraints [1] Seunghyun Yoon 
47 MS  1999  An Evaluation of Workload Limited Order Release Strategies considering Planning Stage in a Jop Shop Byeongdae Choi 
46 PhD  1999  A Study on the Manufacturing System State Based Scheduler using Neural Network and Simulator [20] Kitae Kim 
45 PhD  1999  A Study on Job Shop Scheduling Problems considering Production Capacity Adjustment [16] Daeyoung Chung 
44 MS  1998  Design of Integrated BOM Management System supporting Multiple Views Keumseok Kang 
43 MS  1998  A Study on UML representation of CIM-OSA and availability of analysis and design pattern in CIM-OSA [1] Seungoh Han 
42 MS  1998  A study on an efficient real-time deadlock-free control algorithm by using graph-theoretic approach [27] Jungwoon Yoo 
» PhD  1997  A Study on the Integration of Loading and Scheduling in Flexible Manufacturing Systems [21] Sangbok Woo 
40 PhD  1997  A Study on FMS Design Justification Considering Part Type Selection and Performance Evaluation Hosub Shin 
39 PhD  1997  Computer-Aided Synthesis of the Execution Controllers for Workcells in Computer Integrated Manufacturing Systems [18] Sangkyun Kim 
38 MS  1997  A New Approach to Master Production Scheduling in the MRP environment [1] Sangdo Choi 
37 MS  1997  A Study on FMS Scheduling Problems Based on Priority Functions Generated by Genetic Programming ChangUk Kim 
36 MS  1997  A Scheduling Algorithm Considering Subcontractor and Machine Setup Cost in MRP Environment [1] Kichang Lee 
35 PhD  1997  A Study on the Integration of Process Planning and Scheduling [3] Kidong Kim 
34 PhD  1996  A Design Support System for the Process Design of Computer Integrated Manufacturing [2] Chankwon Park 
33 PhD  1996  An Improved Scheduling Heuristic Based on Batch Splitting Method for The Job Shop Scheduling Problem [4] Hanil Jeong 
32 MS  1996  A Study on the Generation and DB Construction of Modular BOM [1] Yonggu Ji 
31 MS  1995  A Study on the Group Scheduling Problem with Sequence-dependent Set-up Times in a Multi-stage Cellular Manufacturing Systems Jaesoo Shim 
30 MS  1995  A study on Real-Time Collection of Shop Floor Data Using Speech Recognition [2] Namjoo Kim 
29 MS  1995  An Object-Oriented Framework for the Implementation of Distributed Shop Floor Control in FMS [2] Kyungsuk Lee 
28 MS  1995  A study on intelligent dispatching strategy in Automated Manufacturing Systems [5] Seongwoo Lee 
27 MS  1995  A Study on knowledge Acquisition for Simulation-based Scheduling Expert System [1] Soohyun Lee 
26 PhD  1995  Design Support System for the Conceptual Design of Manufacturing Databases [13] Kitae Shin 
25 MS  1994  A Study on Development of a Knowledge Based Scheduler and Knowledge Acquisition through Simulation [1] Kitae Kim 
24 MS  1994  A Study on Distributed Shop Floor Control of Flexible Manufacturing Systems [4] Daeyoung Chung 
23 MS  1994  A Finitely Recursive Processes Approach to Modeling and Control of an FMC Jaeheuk Choi 
22 PhD  1994  A Study on Design of a Cooperative- Distributed Shop Floor Control System for Computer Integrated Manufacturing [19] Namkyu Park 
21 MS  1993  A Supervisory Control Approach to Rapid Implementation of Low-Level Control Software for FMC [1] Sangkyun Kim 
20 MS  1993  A Study on the FMS Shop Floor Control by Bidding among Autonomous Objects Jangsuk Moon 
19 MS  1993  A Study on Effects of Order Release Policies to Performance of Manufacturing Systems Choonghwan Ahn 
18 MS  1993  A Comparative Analysis of Production Control Policies under Production Uncertainty [5] Janghan Lee 
17 MS  1993  A Study on the Computer-Aided Process Planning for Rotational Parts Considering Machine Status [1] Sungbum Chun 
16 MS  1992  A Decision Support System for A Machine Specifications in Design of An FMS [6] Youngkwan Ko 
15 MS  1992  Event-Driven On-Line Operational Control of Flexible Manufacturing Systems Jonghun Park 
14 MS  1992  A Study on Production Planning Problems in a Flexible Machining and Assembly System [1] Sukang Lee 
13 PhD  1991  An Integrated Decision Support System for FMS Planning and Control Problems [11] Seongyoung Jang 
12 MS  1991  A Study on Image Processing and CAD - Vision System Interface of Manufactured Parts [1] Kidong Kim