An Intelligent Planner of Processing Equipment for CSCW-based Shop Floor Control in Agile Manufacturing

김화진,조현보,정무영 한국경영과학회 1995 한국경영과학회 학술대회논문집 Vol.- No.1(1)

A common control model used to implement computer integrated manufacturing(CIM) is based on the hierarchical decomposition of the shop floor activities, in which supervisory controllers are responsible for all the interactions among subordinates. Although the hierarchical control philosophy provides for easy understanding of complex systems, an emerging manufacturing paradigm, agile manufacturing, requires a new control structure necessary to accommodate the rapid development of a shop floor controller. This is what is called CSCW(computer supported cooperative work)-based contro1 of component-based heterarchical control. As computing resources and communication network on the shop floor become increasingly intelligent and powerful, the new control architecture is about to come true in a modern CIM system. In this paper, CSCW-based control is adopted and investigated, in which a controller for a unit of device performs 3 main function-planning, scheduling and execution. In this paper, attention is paid to a planning function and all the detailed planning activities for CSCW-based shop floor control are identified. Interactions with other functions are also addressed. Generally speaking, planning determines tasks to be scheduled in the future. In other words, planning analyzes process plans and transforms process plans into detailed plans adequate for shop floor control. Planning in also responsible for updating the process plan and identifying/resolving replanning activities whether they come from scheduling or execution.

Identification of Scheduling Problems for CSCW-based Shop Floor Control in Agile Manufacturing

Cha, Soohyun,Cho, Hyunbo,Jung, Mooyoung 한국경영과학회 1995 한국경영과학회 학술대회논문집 Vol.- No.1(1)

Numerous solution methods for scheduling problems such as part dispatching problem, operation sequence problem have been suggested as a means to be embedded in hierarchical or centralized shop floor control. Under the preceding control philosophies, however, response to changes in the shop floor status is quite slow and timely decision is sometimes impossible. Moreover, the control software becomes too large and it is almost impossible to modify the control software when the configuration of the shop floor changes. In agile manufacturing which emerged recently to cope with quick response and easy modifiability when unexpected changes occur, a new control policy is needed. CSCW[Computer Supported Cooperative Work]based shop floor control casts a different view on scheduling problems. Decisions are made locally when requested and useful information in scattered among agents for its efficient use. Adaptation is easy because agents are plug compatible or portable. In the paper, scheduling problems occurring under CSCW based shop floor control are identified and characterized. Traditional scheduling problems are reviewed from the CSCW viewpoint. All the control entities involved in the shop floor can be found and used to defined agents. With these entities and CSCW concept, possible scheduling problems are indentified.

Tire Industry and Its Manufacturing Configuration

Lee, Young-Sik,CPIM,Lee, Jin-Kyu 한국경영과학회 2000 한국경영과학회 학술대회논문집 Vol.- No.1

This paper is intended to propose what manufacturing confifuration (manufacturing planning and shop floor control) is suitable for the tire industry. Basically tire-manufacturing process is mixed-products, parallel-disconnected-flow-shop. Both throughput time and cycle time are very short, the variety of tires is very high, the setup time is long, shop floor data reporting requirements is high, and there are many equipments and people working. And with no exception, tire industry also now confronts increasing requirements of delivery conformance. With the above peculiar characteristics of tire manufacturing and changing market environments, this paper suggests, weekly master scheduling with no MRP is desirable and traditional kanban is right selection for shop floor control/scheduling. This paper describes why this configuration should be, using the manufacturing engineering principles and some new insights like four primitives of parallel flow shop. Generally known that shop with high parallel-product-mix and long sctup time isn't good candidate for kanban. The four primitives of parallel flow shop explain why kanban is also useful scheduling technique in that enviroment.

Hybrid Shop Floor Control System for Computer Integrated Manufacturing (CIM)

Park, Kyung-Hyun,Lee, Seok-Hee The Korean Society of Mechanical Engineers 2001 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.15 No.5

A shop floor can be considered as an important level to develop Computer Integrated Manufacturing system (CIMs). However, a shop floor is a dynamic environment where unexpected events continuously occur, and impose changes to the planned activities. To deal with this problem, a shop floor should adopt an appropriate control system that is responsible for the coordination and control of the manufacturing physical flow and information flow. In this paper, a hybrid control system is described with a shop floor activity methodology called Multi-Layered Task Initiation Diagram (MTD). The architecture of the control model contains three levels: i.e., he shop floor controller (SFC), the intelligent agent controller (IAC) and the equipment controller (EC). The methodology behind the development of the control system is an intelligent multi-agent paradigm that enables the shop floor control system to be an independent, an autonomous, and distributed system, and to achieve an adaptability to change of the manufacturing environment.

하이브리드 ? 플로워 제어를 위한 오퍼레이션 모델에 관한 연구

최경현,배창현 濟州大學校 産業技術硏究所 2000 산업기술연구소논문집 Vol.11 No.1

Manufacturing system is composed of many activities that can be monitored and controlled at different level. A shop floor can be considered as an important level to develop Computer Integrated Manufacturing(CIM). However. a shop floor is the dynamic environment where the unexpected events continuously occur. and impose changes to planned activities. In this paper. task-oriented control model. called (MuLOM(Multi-Layered Operation Model), is suggested to represent control model for a hybrid control architecture which is composed three levels. i.e.. shop floor controller(SFC). intelligent agent controller( IAC) and equipment controller( EC).

하이브리드 ��플로워 제어를 위한 오퍼레이션 모델에 관한 연구

최경현,배창현 제주대학교 산업기술연구소 2000 尖端技術硏究所論文集 Vol.11 No.1

Manufacturing system is composed of many activities that can be monitored and controlled at different level. A shop floor can be considered as an important level to develop Computer Integrated Manufacturing(CIM). However, a shop floor is the dynamic environment where the unexpected events continuously occur, and impose changes to planned activities. In this paper, task-oriented control model, called (MuLOM(Multi-Layered Operation Model), is suggested to represent control model for a hybrid control architecture which is composed three levels, i.e., shop floor controller(SFC), intelligent agent controller(IAC) and equipment controller(EC).

Multi-factors Bidding method for Job Dispatching in Hybrid Shop Floor Control System

Lee, Seok--Hee,Park, Kyung-Hyun,Bae, Chang-Hyun Korean Society for Precision Engineering 2000 International Journal of Precision Engineering and Vol.1 No.2

A shop floor can be considered as and importand level to develop a Computer Integrated Manufacturing system (CIMs). The shop foor is a dynamic environment where unexpected events contrinuously occur, and impose changes to planned activities. The shop floor should adopt an appropriate control system that is responsible for scheduling coordination and moving the manufacturing material and information flow. In this paper, the architecture of the hybrid control model identifies three levels; i.e., the shop floor controller (SFC), the cell controller(CC) and the equipment controller (EC). The methodology for developing these controller is employ an object-oriented approach for static models and IDEF0 for function models for dispatching a job. SFC and CC are coordinated by employing a multi-factors bidding and an adapted Analytic Hierarchy Process(AHP) prove applicability of the suggested method. Test experiment has been conducted by with the shopfloor, consisting of six manufacturing cells.

A Petri-Net Based Execution Model of Processing Equipment for CSCW-based Shop Floor control in Agile Manufacturing

홍순도,조현보,정무영 한국경영과학회 1995 한국경영과학회 학술대회논문집 Vol.- No.1(1)

A shop floor control system(SFCS), a central part of agile manufacturing, performs the production activities required to fill orders. In order to effectively control these activities, CSCW (computer supported cooperative work) is adopted where a supervisor does not exist. In this paper, we define functional perspective of CSCW-based shop floor control using planning, scheduling, and execution functions. In particular, we focus on an execution model than can coordinate the planning and scheduling functions. Execution can be defined informally as a function the downloads and performs a set of scheduled tasks. Execution is also responsible for identifying and resolving various errors whether they come from hardware of software. The purpose of this research is to identify all the execution activities and solving techniques under the assumptions of CSCW-based heterarchical control architecture. This paper also proposes a classification scheme for execution activities of CSCW-based heterarchical control architecture. Petri-nets are used as a unified framework for modeling and controlling execution activities. For solving the nonexistence of a supervisor, A negotiation-based solution technique is utilized.

생산현장에서 발생하는 불확실성을 고려한 생산통제기법들의 유용성 분석 : Shop Floor Control 측면을 중심으로

이장한,박진우 한국경영과학회 1993 한국경영과학회 학술대회논문집 Vol.- No.2

In this paper, we investigate the effect of production uncertainty - especially demand fluctuation and activity time variation, to production control policies. First, we examine three famous production control policies, namely, MRP, JIT, OPT, from shop floor control perspective and analyze the difference among them. Based on these, simulation studies are performed to draw out the effects of demand fluctuations which are classified into demand lumpiness and demand irregularity, and, the effects of activity time variations which are classified into standard time variation and non-standard time variation. Experimental investigation shows that, in term of demand fluctuations, MRP is affected by demand lumpiness. but JIT by demand irregularity. And we also see that both MRP and JIT are influenced by standard time variation with respect to activity time variations.

멀티 에이전트 기반 샾 플로워 제어 시스템

최경현,조수정 朝鮮大學校 機械技術硏究所 2006 機械技術硏究 Vol.9 No.1

This paper addresses an intelligent agent-based shop floor control system for Flexible Manufacturing System(FMS). With an intelligent agent approach, the FMS will be achieve a adaptability to change of manufacturing environment. As the development methodology of shop floor control system, an object-oriented modeling technique is employed for building models associated with FMS operation. The active agent is contributed to control components of FMS in real-time, whereas the coordinator agent has great role. It communicates with other active agents to get information about status on system and generates the next optimal task through the making-decision logic and dispatch it to other active agent.