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Papers by Michael Vidalis
Analysis and Design of …, Jan 1, 2009
In this chapter we give a brief overview of the significant technological changes which have occu... more In this chapter we give a brief overview of the significant technological changes which have occurred since the 1950s. The importance of information technology in manufacturing systems and the need for the designer to have performance measures other than throughput in mind during the design process is treated. A presentation of some areas in mathematical analysis, which are important for our work, is contained in Appendix A. In Section 1.1, the evolution and classification of manufacturing systems is covered. Section 1.2 treats ...
Analysis and Design of …, Jan 1, 2009
The buffer allocation problem, BAP, is concerned with the allocation of a certain fixed number of... more The buffer allocation problem, BAP, is concerned with the allocation of a certain fixed number of buffer slots, N, among the K− 1 intermediate buffer locations of a production line in order to meet some specified objective. The number of stations of the line is fixed at K, the number of servers assigned to each station is fixed and the work allocation w=(w 1, w 2, ¼, w K)\ bf w=(w _ 1, w _ 2, ..., w _ K) is also fixed. The buffer allocation problem is of particular interest to operations management in that in many practical production line situations, the ...
Analysis and Design of …, Jan 1, 2009
There are three pure allocation problems, viz., the work-load allocation problem, the server allo... more There are three pure allocation problems, viz., the work-load allocation problem, the server allocation problem and the buffer allocation problem, all concerned with maximizing throughput. Mathematically, these problems may be described as follows: The work-load allocation problem, WAP: maxX (w)= maxX (w 1, w 2, ¼, w K)\ max X (\ bf w)=\ max X (w _ 1, w _ 2, ..., w _ K) subject to: ∑_i=1^Kw_i=1,\\mboxfor ∑ _ i= 1^ K w _ i= 1,\\ mbox for w _ i> 0 for normalized total work-load equal to unity and fixed allocation of servers and fixed ...
This book provides a complete overview of production systems and describes the best approaches to... more This book provides a complete overview of production systems and describes the best approaches to analyze their performance. Written by experts in the field, this work also presents numerous techniques that can be used to describe, model, and optimize the performance of various types of production lines. The book is intended for researchers, production managers, and graduate students in industrial, mechanical, and systems engineering.
Analysis and Design of …, Jan 1, 2009
A major consideration in the management of production is to understand the cost impact of various... more A major consideration in the management of production is to understand the cost impact of various designs. Much of the work relating to overall production management including the design of facilities would seem to indicate that the decision processes are serial rather than concurrent or iterative feedback. The classical idea would appear to be that the engineering designers decide on the layout of the line with primary interest in the engineering performance measures of the stations and subsequently this design is costed and justified ...
Analysis and Design of …, Jan 1, 2009
This chapter is essentially a prelude to the rest of the text and its objective is to assist the ... more This chapter is essentially a prelude to the rest of the text and its objective is to assist the reader to understand the main initial design problems that arise with production lines. It is important for the reader to clarify the context of any design problem related to any production line, eg, is it a green fields situation, a modification of an existing production line to enhance performance or the adaptation of an existing line to produce products not produced already? Once the strategic decision to use a production line to manufacture the products has been ...
Analysis and Design of …, Jan 1, 2009
The focus here is on discrete part production lines with asynchronous movement where each part pr... more The focus here is on discrete part production lines with asynchronous movement where each part produced is distinct. Production lines processing fluids and other continuous materials are not considered. From here on, when reference is made to production lines, discrete part production lines will be understood. In a production or flow line, all jobs are required to pass through each station in the same sequence once. These lines are usually associated with scale rather than scope, and a major advantage of production lines is the associated simple materials handling requirements.
Analysis and Design of …, Jan 1, 2009
In this chapter, two separate design problems are considered, viz., the work-load allocation prob... more In this chapter, two separate design problems are considered, viz., the work-load allocation problem and the server allocation problem in production lines. In a broad sense both design problems are related to the allocation of work from the point of view of the operators. Section 4.1 of the chapter describes what is classically known as the work-load allocation problem, ie, the allocation of work to each station of the line so that all the required work is undertaken having in mind any precedence requirements. A well-known empirically observed ...
This book provides a complete overview of production systems and describes the best approaches to... more This book provides a complete overview of production systems and describes the best approaches to analyze their performance. Written by experts in the field, this work also presents numerous techniques that can be used to describe, model, and optimize the performance of various types of production lines. The book is intended for researchers, production managers, and graduate students in industrial, mechanical, and systems engineering.
Analysis and Design of …, Jan 1, 2009
In this chapter we give a brief overview of the significant technological changes which have occu... more In this chapter we give a brief overview of the significant technological changes which have occurred since the 1950s. The importance of information technology in manufacturing systems and the need for the designer to have performance measures other than throughput in mind during the design process is treated. A presentation of some areas in mathematical analysis, which are important for our work, is contained in Appendix A. In Section 1.1, the evolution and classification of manufacturing systems is covered. Section 1.2 treats ...
Analysis and Design of …, Jan 1, 2009
The buffer allocation problem, BAP, is concerned with the allocation of a certain fixed number of... more The buffer allocation problem, BAP, is concerned with the allocation of a certain fixed number of buffer slots, N, among the K− 1 intermediate buffer locations of a production line in order to meet some specified objective. The number of stations of the line is fixed at K, the number of servers assigned to each station is fixed and the work allocation w=(w 1, w 2, ¼, w K)\ bf w=(w _ 1, w _ 2, ..., w _ K) is also fixed. The buffer allocation problem is of particular interest to operations management in that in many practical production line situations, the ...
Analysis and Design of …, Jan 1, 2009
There are three pure allocation problems, viz., the work-load allocation problem, the server allo... more There are three pure allocation problems, viz., the work-load allocation problem, the server allocation problem and the buffer allocation problem, all concerned with maximizing throughput. Mathematically, these problems may be described as follows: The work-load allocation problem, WAP: maxX (w)= maxX (w 1, w 2, ¼, w K)\ max X (\ bf w)=\ max X (w _ 1, w _ 2, ..., w _ K) subject to: ∑_i=1^Kw_i=1,\\mboxfor ∑ _ i= 1^ K w _ i= 1,\\ mbox for w _ i> 0 for normalized total work-load equal to unity and fixed allocation of servers and fixed ...
This book provides a complete overview of production systems and describes the best approaches to... more This book provides a complete overview of production systems and describes the best approaches to analyze their performance. Written by experts in the field, this work also presents numerous techniques that can be used to describe, model, and optimize the performance of various types of production lines. The book is intended for researchers, production managers, and graduate students in industrial, mechanical, and systems engineering.
Analysis and Design of …, Jan 1, 2009
A major consideration in the management of production is to understand the cost impact of various... more A major consideration in the management of production is to understand the cost impact of various designs. Much of the work relating to overall production management including the design of facilities would seem to indicate that the decision processes are serial rather than concurrent or iterative feedback. The classical idea would appear to be that the engineering designers decide on the layout of the line with primary interest in the engineering performance measures of the stations and subsequently this design is costed and justified ...
Analysis and Design of …, Jan 1, 2009
This chapter is essentially a prelude to the rest of the text and its objective is to assist the ... more This chapter is essentially a prelude to the rest of the text and its objective is to assist the reader to understand the main initial design problems that arise with production lines. It is important for the reader to clarify the context of any design problem related to any production line, eg, is it a green fields situation, a modification of an existing production line to enhance performance or the adaptation of an existing line to produce products not produced already? Once the strategic decision to use a production line to manufacture the products has been ...
Analysis and Design of …, Jan 1, 2009
The focus here is on discrete part production lines with asynchronous movement where each part pr... more The focus here is on discrete part production lines with asynchronous movement where each part produced is distinct. Production lines processing fluids and other continuous materials are not considered. From here on, when reference is made to production lines, discrete part production lines will be understood. In a production or flow line, all jobs are required to pass through each station in the same sequence once. These lines are usually associated with scale rather than scope, and a major advantage of production lines is the associated simple materials handling requirements.
Analysis and Design of …, Jan 1, 2009
In this chapter, two separate design problems are considered, viz., the work-load allocation prob... more In this chapter, two separate design problems are considered, viz., the work-load allocation problem and the server allocation problem in production lines. In a broad sense both design problems are related to the allocation of work from the point of view of the operators. Section 4.1 of the chapter describes what is classically known as the work-load allocation problem, ie, the allocation of work to each station of the line so that all the required work is undertaken having in mind any precedence requirements. A well-known empirically observed ...
This book provides a complete overview of production systems and describes the best approaches to... more This book provides a complete overview of production systems and describes the best approaches to analyze their performance. Written by experts in the field, this work also presents numerous techniques that can be used to describe, model, and optimize the performance of various types of production lines. The book is intended for researchers, production managers, and graduate students in industrial, mechanical, and systems engineering.