Research

year 1997 
author Hosub Shin 
Keyword part type selection, FMS configuration, system performance,design justification 
Abstract The estimated advantages of introducing FMS are improved productivity, reduced work-in-process inventory and lead time, faster response to customer request, etc. Despite these advantages, however, the implementation of FMS has not been popular in Korea. There are two main reasons for such phenomenon. One is the difficulties encountered in operating the installed FMS, and the other is the lack of structured approach that can help top management to decide whether an FMS is a viable alternative to their production environment or not. This thesis deals with the latter subject.

When we plan to introduce an FMS, a preliminary feasibility study should be performed before the actual introduction of FMS. At this stage the basic decision support requirements are selection of part types, determination of FMS configuration and economic justification. Since the selection of part types and determination of FMS configuration are not independent and have some interactions between them, various design alternatives can be generated. And these design alternatives are also evaluated from both the system performance and economic justification perspectives.

In this thesis, a mathematical model is proposed for these basic decision support requirements. The model adopts a closed queueing network model for the performance evaluation of FMS design alternatives and then the well-known payback period method is reflected as an economic justification criterion. Since the resulting model is a nonlinear integer programming model, a structured solution procedure is presented and implemented. For the concurrent evaluation of system performance and economic justification, the proposed FMS design justification system consists of three modules: performance evaluation module, configuration search module and part type selection module.

An analytical model for the performance evaluation of an FMS is implemented in performance evaluation module, where starving delay of a station with limited local buffer in FMS occurs when the next workpiece to be processed is not transported to the station that as just finished working. When a starving delay occurs a possible extra is considered through a revised process plan of part types to be processed. In this revised process plan, we can include central buffer storage as one of the stations of classical closed queueing network model. Now, we can analyze the overload of transportation vehicle imposed by extra trips between central buffer storage and stations, which was not accounted for explicitly in the traditional closed queueing network model. The duration of extra trip and the speed of transportation vehicle that influence the unwilling starving time of each station are analytically approximated and reflected. The simulation study shows that the proposed model makes the performance evaluation of FMS more realistic than classical models can do.

For the efficient search of the solution space which spans the space of candidate part types and FMS configurations, the proposed solution procedure divides the entire solution space according to each FMS configuration. In configuration search module, two different search strategies are implemented. The one is for expanding processing capacities and the other is for modeling. For the capacity expanding strategy, this thesis shows that we don´t have to consider all the feasible FMS configurations and only expanding the capacity of bottleneck station is enough. When modeling an FMS using classical queueing network model, the processing equipment of the same resource type is generally modeled as a multi-server single station. Though this modeling approach can give a good system performance, it is not always true in view of economic perspective. Thus, in the modeling strategy, a multi-server processing station is divided into individual single-server stations and a heuristic is proposed to balance workload between them for the improvement of system performance. For the same part types to be processed in FMS, the modeling strategy can generate more cost-effective FMS configuration than the traditional modeling approaches.

Part type selection module is for the exploration of the solution space consisting various candidate part types that can be processed in a given FMS configuration. For a given combination of FMS configuration and candidate part types, the total benefit/cost factors are analyzed from an economic justification perspective and system throughput is examined from a system performance perspective. A greedy heuristic is proposed for the selection of part types to be processed in FMS by adding a part type considering these economic factors and system performance.

This thesis proposed a design justification approach for a series of decision support problems that can be raised at the initial design stage of FMS and show that the proposed solution procedure can be applied to a real world problem through a case study. 
c PhD 

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번호 c year 제목 author
111 PhD  1995  Design Support System for the Conceptual Design of Manufacturing Databases [13] Kitae Shin 
110 PhD  1991  An Integrated Decision Support System for FMS Planning and Control Problems [11] Seongyoung Jang 
109 PhD  1994  A Study on Design of a Cooperative- Distributed Shop Floor Control System for Computer Integrated Manufacturing [19] Namkyu Park 
108 PhD  1996  An Improved Scheduling Heuristic Based on Batch Splitting Method for The Job Shop Scheduling Problem [4] Hanil Jeong 
107 PhD  1996  A Design Support System for the Process Design of Computer Integrated Manufacturing [2] Chankwon Park 
106 PhD  1997  A Study on the Integration of Process Planning and Scheduling [3] Kidong Kim 
105 PhD  1997  Computer-Aided Synthesis of the Execution Controllers for Workcells in Computer Integrated Manufacturing Systems [18] Sangkyun Kim 
» PhD  1997  A Study on FMS Design Justification Considering Part Type Selection and Performance Evaluation Hosub Shin 
103 PhD  1997  A Study on the Integration of Loading and Scheduling in Flexible Manufacturing Systems [21] Sangbok Woo 
102 PhD  1999  A Study on Job Shop Scheduling Problems considering Production Capacity Adjustment [16] Daeyoung Chung 
101 PhD  1999  A Study on the Manufacturing System State Based Scheduler using Neural Network and Simulator [20] Kitae Kim 
100 PhD  2002  Flexible Job Shop Scheduling with Multi-level Job Structures [16] Yangja Jang 
99 PhD  2003  Process Modeling and Performance Analysis Methodology toward Optimal Design of Manufacturing Systems [30] Kichang Lee 
98 PhD  2004  Ontology Development for e-Business Integration [26] Tai-Woo Chang 
97 PhD  2005  A Study on the Integration of Quality Designing and Process Control in Steel Industry [15] Jonghan Kim 
96 PhD  2005  Performance Analysis and Network Design of Supply Chain for Strategic Decision Making [14] Eoksu Sim 
95 PhD  2005  Development of an algorithm for multi-plant production plans in a supply chain [50] Sungwon Jung 
94 PhD  2008  A study on integrated production planning and strategic framework in supply chain [15] Haejoong Kim 
93 PhD  2009  A Study for Business Process Improvement Using Real-time Information of Unbalanced Work [19] Jaehyun Kong 
92 PhD  2010  Framework for Integrative SRM System and Collaboration Scorecard [26] Jongkyoung Park 
91 PhD  2007  A Study on MRP Process Improvement in a Grid Enabled APS [2] file Hyoung-Gon Lee 
90 PhD  2010  Enhancing Flexibility and Responsiveness in Sales Order Management [54] Mokmin Park 
89 PhD  2013  Price of Simplicity under Congestion: On the Revenue and Pricing Schemes in the Telecommunication Industry [58] file Dongmyung Lee 
88 PhD  2013  A study on production scheduling problems considering differential electricity pricing and distributed generations Jun Young Moon 
87 PhD  2014  Multi-level job scheduling in a flexible discrete-part production environment Hong Bum Na 
86 PhD  2014  A study on integrative decision-making system for reconfigurable manufacturing cells Jin Wu Seo 
85 MS  1994  A Study on Distributed Shop Floor Control of Flexible Manufacturing Systems [4] Daeyoung Chung 
84 MS  1994  A Study on Development of a Knowledge Based Scheduler and Knowledge Acquisition through Simulation [1] Kitae Kim 
83 MS  1995  A Study on knowledge Acquisition for Simulation-based Scheduling Expert System [1] Soohyun Lee 
82 MS  1995  A study on intelligent dispatching strategy in Automated Manufacturing Systems [5] Seongwoo Lee 
81 MS  1988  A Simulation Study on Operating Rules of FMS Considering Tool Change Byunghoon Yoo 
80 MS  1988  Development of a Classification and Coding System through Fuzzy Sets Approach [1] Namkyu Park 
79 MS  1988  A Study on The Machine-Part Group Formation for FMS Planning and Operation Jaeyoon Kim 
78 MS  1989  A Study on the Computer and Database Location of Distributed Computer Systems in FMS [1] Kilsup Yang 
77 MS  1989  An FMS Planning Algorithm Considering Tool Magazine Capacity and Alternative Routings [6] Chankwon Park 
76 MS  1989  A Mathematical Decision Making Model for Real-Time Scheduling of an FMS Jonghan Kim 
75 MS  1995  An Object-Oriented Framework for the Implementation of Distributed Shop Floor Control in FMS [2] Kyungsuk Lee 
74 MS  1995  A study on Real-Time Collection of Shop Floor Data Using Speech Recognition [2] Namjoo Kim 
73 MS  1995  A Study on the Group Scheduling Problem with Sequence-dependent Set-up Times in a Multi-stage Cellular Manufacturing Systems Jaesoo Shim 
72 MS  1990  A Fuzzy Linguistic Approach to the Part Selection Problem in FMS [1] Yoosuk Hong 
71 MS  1990  A Study on Data Allocation Problems for Distributed Database Design [2] Kitae Shin 
70 MS  1991  A Study on Scheduling Problem of Hierarchically Structured Products in FMS [1] Hanil Jeong 
69 MS  1991  A Study on Performance Evaluation of Production Plan for FMS Using Queueing Network [1] Sangbok Woo 
68 MS  1991  A Study on the Layered Architecture for the Control of FMS Cells Hosub Shin 
67 MS  1991  A Study on Image Processing and CAD - Vision System Interface of Manufactured Parts [1] Kidong Kim 
66 MS  1992  A Study on Production Planning Problems in a Flexible Machining and Assembly System [1] Sukang Lee 
65 MS  1992  Event-Driven On-Line Operational Control of Flexible Manufacturing Systems Jonghun Park 
64 MS  1992  A Decision Support System for A Machine Specifications in Design of An FMS [6] Youngkwan Ko 
63 MS  1993  A Study on the Computer-Aided Process Planning for Rotational Parts Considering Machine Status [1] Sungbum Chun 
62 MS  1993  A Comparative Analysis of Production Control Policies under Production Uncertainty [5] Janghan Lee