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  1993  A Study on Effects of Order Release Policies to Performance of Manufacturing Systems Choonghwan Ahn 
60 MS  1993  A Study on the FMS Shop Floor Control by Bidding among Autonomous Objects Jangsuk Moon 
59 MS  1993  A Supervisory Control Approach to Rapid Implementation of Low-Level Control Software for FMC [1] Sangkyun Kim 
58 MS  1994  A Finitely Recursive Processes Approach to Modeling and Control of an FMC Jaeheuk Choi 
57 MS  1996  A Study on the Generation and DB Construction of Modular BOM [1] Yonggu Ji 
56 MS  1997  A Scheduling Algorithm Considering Subcontractor and Machine Setup Cost in MRP Environment [1] Kichang Lee 
55 MS  1997  A Study on FMS Scheduling Problems Based on Priority Functions Generated by Genetic Programming ChangUk Kim 
54 MS  1997  A New Approach to Master Production Scheduling in the MRP environment [1] Sangdo Choi 
53 MS  1998  A study on an efficient real-time deadlock-free control algorithm by using graph-theoretic approach [27] Jungwoon Yoo 
52 MS  1998  A Study on UML representation of CIM-OSA and availability of analysis and design pattern in CIM-OSA [1] Seungoh Han 
51 MS  1998  Design of Integrated BOM Management System supporting Multiple Views Keumseok Kang 
50 MS  1999  An Evaluation of Workload Limited Order Release Strategies considering Planning Stage in a Jop Shop Byeongdae Choi 
49 MS  1999  A Study on the Development of Event-driven MRP Components Considering Capacity Constraints [1] Seunghyun Yoon 
48 MS  1999  A Study on the Implementation of the Speech Recognition System for the Real-Time Decision Support of Manufacturing Cells [18] Eoksu Sim 
47 MS  2000  A Study on Work Measurement Using Image Processing [8]
46 MS  2000  Design of a Hybrid System in Integrating Kanban with MRP [2] Taeyoung Song 
45 MS  2000  Job Shop Scheduling for Minimizing the Sum of Earliness and Tardiness Dongsu Park 
44 MS  2000  A Study on Integrated Production Planning of Distributed Manufacturing Systems on Supply Chain Dosung Go 
43 MS  2001  A Study of Decision Support for the implementation of Cellular Manufacturing Systems. [1] Muynghee Byun 
42 MS  2001  A Study on Components Development for Production Management Daiki Min 
41 MS  2002  Design and Implementation of Model Management System for Supply Chain Planning [1] Youngcheol Yang 
40 MS  2002  A combined DEA and BSC methodology for evaluating organization efficiency [1] Bumsoo Kim 
39 MS  2003  Design of a BOF Blowing Control Model Using Artificail Intelligence Jungjoon Park 
38 MS  2003  Production Planning and Distribution Planning using Demand based mixed Genetic Algorithm in a Supply Chain Jung Im 
37 MS  2004  A Study on Extended Workflow Model Considering Activity Based Costing [27] Moontae Hwang 
36 MS  2004  A Study on Reverse Supply Chain of End of Life Vehicle for the Enhanced Recycle Performance [6] Miyeon Ryu 
35 MS  2004  A Study on business process model for extended and integrated supply chain planning : Focused on negotiation [5] Yuncheol Kang 
34 MS  2004  A Design on Cost-Estimation Support System for Injection Mold Using AI Method [12] Gunhee Kim 
33 MS  2004  A study on due-date assignment method in wafer fabrication facility producing multiple product types [3] Jaewon Park 
32 MS  2005  A Study on RFID application in Reverse Supply Chain [3] Dongjoon Lim 
31 MS  2005  Development of Reference Model and Strategic Road Map for the Implementation of a Reverse Supply Chain [183] Chihoon Lim 
30 MS  2005  A Study on Developing of Position collecting Vision system Using Marker [1] Jiyoon Park 
29 MS  2005  A Study on Product Development Methodology in Reverse Supply Chain [77] Joon Kim 
28 MS  2006  A Study on the Application of Group Technology for Naval Ship Design And Manufacturing: Relating to Platform Family Architecture [17] Gwangjae Park 
27 MS  2006  A Framework for the ubiquitous MES using RFID and Web services Technology [25] Manchul Han 
26 MS  2006  A Study on the Assessment Method of Installation and Operation Cost in a Reverse Supply Chain [2] file Hyunjong Jeong 
25 MS  2007  A Study on the Valuation of a Supply Chain Considering Management Efficiency and Environmental Effect [53] Jiyoun Kim 
24 MS  2008  An Study abou the Application and Effect of RFID Technology in the Activity Collecting Information to Improvement of Manufacturing Process [10] Sungho Jo 
23 MS  2009  A Fuzzy-AHP based Decision making Model for ground operations [37] Youngkyun Lee 
22 MS  2009  A Study on Integrated Risk Management in Supply Chain - Focusing on High-tech Electronic Industry [52] file Kanghyun Kim 
21 MS  2009  A Study on Mine Artillery Hit Using Simulation [3] Youngho Chung 
20 MS  2009  A Study on the Economic Feasibility of Automated Identification Technology on the ELV Management Process [25] file Kiheon Nam 
19 MS  2007  A Study on Project Risk Management based on Earned Value Management [25] file Hyunil Noh 
18 MS  2007  A Study on BOM for Enhancing Efficiency of Reverse Supply Chain [14] Jinseon Yoo 
17 MS  2007  A Study on Utility Value and Fairness of Information Sharing in Supply Chain [18] file Myongran Oh 
16 MS  2007  A Simulation Study on the Impact of RFID Technology on the Supply Chain Counting Process [13] file Jangwon Cho 
15 MS  2008  A study on supplier's performance measurements for a supply chain on a new product environment [1] Jungsub Lee 
14 MS  2008  Integration of RFID and Web Service Technology in Manufacturing Systems [20] file Gunnam Ong 
13 MS  2011  A Study on RMC Scheduling using Simulation [19] Jeongho Park 
12 MS  2011  Intelligent service during middle-of-life phase of a product: Illustration of framework and its evaluation model [3] Soyeon Yoon