Reliability: Its implications in production systems design

Research on production systems design has in recent years tended to concentrate on ‘software’ factors such as organisational aspects, work design, and the planning of the production operations. In contrast, relatively little attention has been paid to maximising the contributions made by fixed assets, particularly machines and equipment. However, as the cost of unproductive machine time has increased, reliability, particularly of machine tools, has become ever more important. Reliability theory and research has traditionally been based in the main on electrical and electronic equipment whereas mechanical devices, especially machine tools, have not received sufficiently objective treatment. A recently completed research project has considered the reliability of machine tools by taking sample surveys of purchasers, maintainers and manufacturers. Breakdown data were also collected from a number of engineering companies and analysed using both manual and computer techniques. Results obtained have provided an indication of those factors most likely to influence reliability and which in turn could lead to improved design and selection of machine tool systems. Statistical analysis of long-term field data has revealed patterns of trends of failure which could help in the design of more meaningful maintenance schemes.     

Simple systems for computer-aided production management

Future production concepts where workshop employees responsibly carry through planning and scheduling tasks call for new principles ofcomputer-aided production management (CAPM). With the aid of a critical analysis ofdifferent planning and scheduling mechanisms it will first be laid down why the field of computer-aided production management is suited for a dialogue-oriented planning support based on simple models rather than for the objective of automation with the aid of refined optimization algorithms. Consequently, an alternative design is proposed. This is a prototypically realized concept aiming at computer-aided support of production management of production teams.     

An integrated closed-loop product lifecycle management approach for reverse logistics design

Nowadays, reverse logistics is gaining importance for many companies in different industries. This importance is rooted in the fact that it generates profit and decreases the environmental impacts of products. Even though the decrease of environmental impacts is an indispensable requisite, reverse logistics design is only driven by cost indicators. The main reason behind this high cost is access to environmental information is difficult and is directly linked to data all along the lifecycle of the product. This paper presents a method by which reverse logistics design integrates environmental impacts based on the management of closed-loop product lifecycle. This method is divided into two processes: from beginning of life to end of life and from end of life to beginning of life. The first process integrates product data in order to calculate environmental impacts of the potential reverse logistics networks, whereas the second process selects the most appropriate reverse logistics network before optimising the product based on this particular network. The proposition is illustrated by a case study on a recycled aluminium automotive part.     

A queuing/management consideration on Japanese production systems

A single-stage lot/cell production under a Poisson arrival and exponential service in a batch is considered. The three economic queuing models of push and pull types are presented, an economic comparison of push versus pull types is considered, and a strategic management/design consideration to the lot production is given. First, the total expected operating cost is given for the three queuing models including the Omote-Kanban type similar to VMI. Second, the push versus pull system is discussed from a view of setup time, inventory or operating cost, and it is ascertained that the three types are alternative. Finally, a strategic management basis for economic traffic, leadtime setting is given, and discussed by the introduction of production matrix on 2-stage design.     

Qualitative decision making with integrated systems design methodology: A case study

System design is associated with building a formal morphology of the system, comprising the process of defining the system parameters, submodels, and criteria, selecting an optimal candidate, and preparing a detail implementation plan for the chosen candidate. It is primarily a wholistic approach to engineering a system, and is differentiated from operations research and other analytical methods. Specifically, operations research may be used to help resolve problems within a system, but usually does not replace the design and development process necessary to complete a system. However, it assists in the development process of the resulting configurations.This case study introduces a set of criterion function models and algorithms for the design of systems, along with mathematical foundations for building the models. Criteria for the system are determined and candidate system values are represented as probabilities in the [0, 1] range in order to achieve ordinal ranking of candidates on a cardinal scale. Both mutually exclusive and interactive design criteria could be represented by the developed models, which allow reflection of the nature of a wide variety of real-world systems. The developed models and algorithms are illustrated with a numerical example.     

System reform in integrated health systems

As the debate progresses on health care reform and the ultimate form of the U.S. system, important lessons can be drawn from examinations of other health care systems. From the U.S. perspective, European health systems appear to have a certain homogeneity about them. Americans tend to look at all European arrangements as single-source financing systems. Because these systems all provide universal coverage, the assumption is that there must be a strong cohesion and similarity among them. Viewed from the European perspective, the reality appears to be rather different. In this article, the health cae systems of Nordic countries are analyzed in terms of their differences both from other European systems and from the United States approach.     

The psychology of organizational structure in integrated health systems

Examine a social learning theory model as a framework to guide health system leaders as they consider the psychology of organizational design as it pertains to the successful integration.     

A model for integrated production-packaging systems

The problem of determining the economic packaging frequency of jointly replenished items has received a lot of attention from researchers. This problem is usually encountered while packaging the products after completing manufacture. Nevertheless, production batch quantities certainly influence the manufacturing cycle time of products and hence the economic packaging quantities for jointly replenished items. Therefore, realizing the importance of the relationship between production batch quantities and packaging quantities     

The nature of knowledge and the platform and matrix solutions in the design of knowledge management systems

The structure of knowledge systems is a crucial component of the effort to make these systems effective and acceptable to users. This paper argues that the structure must correspond with the nature of knowledge, as the externalization of cognitive phenomena, in the form of intellectual nuggets that include topics, stories, concepts, and images. Lessons from the structuring of organizations suggest that the platform and the matrix approaches could be adopted in the design of knowledge systems. The paper then describes the advantages and limitations of these solutions.     

集成物流管理系统中定位—运输路线安排问题的研究

综述集成物流管理系统中设施定位—运输车辆行程路线安排问题的主要研究进展 ,分析提出有关求解问题的算法的特点 ,最后提出该研究领域应该关注的几个重要发展方向 .     

The application of microcomputers in production management

The findings reported result from a questionnaire survey, and a number of company interviews. Further questions which need to be answered are identified, and a research project to provide these answers is outlined.     

An integrated model for measuring management performance

A model of organizational performance measurement that compels attention to the proper balance among quality, cost, and access; takes into account patient perceptions; produces clear targets for continual quality improvement (CQI); yields easily understood graphical displays; and captures health care organizations in simultaneous operation across the functions of cost, quality, and access was designed for the 22 medical treatment facilities of the Strategic Air Command. Such a tool provides practitioners, payers, and patients a range of information--from systemwide, facility, clinical service, and practitioner-specific insights on current performance to resource forecasts and easily understood targets for CQI. This case study shows that integrated performance modeling may be useful in examining many health management and reform issues.     

A network-based approach to integrated supply chain design

The inherent complexity of supply chains, combined with their economic importance, has prompted research in supply chain management. While there has been a significant amount of work reported in modelling supply chains, the effectiveness of these models in addressing the complex area of supply chain management is questionable. What is giving added urgency to the need for research in this area are the recent developments in communications that offer the promise of connecting suppliers, assemblers and customers in a seamless network of information that can form integrated supply chain management. This paper aims to address the deficiency in modelling by proposing a methodology that models the integrated supply chain as an abstracted network, called a Trans-Net. The Trans-Net approach offers three main potential advantages. First, the multiple participants in a supply chain can be modelled without undue complexity. Second, it is an approach that allows users to examine the interactions between different considerations so that important attributes such as cost and lead-time can be readily calculated and bottleneck areas identified. Third, it applies a mathematical formalism to the problem, with the potential of being relatively straightforward to computerize.     

Evaluation of management information systems

The economic evaluation of Management Information Systems may be based on the following theories and techniques: Control Theory, System Dynamics, (discrete-event) simulation, and gaming. Applications of these approaches are summarized. Advantages and disadvantages of the various approaches are presented.     

Hierarchical control of semi-automated production systems

An integrated control model of a hierarchical production system is presented where the output can be measured only at preset control points as it is impossible or costly to measure it continuously. Three levels are considered—company, section, production unit—each level faces stochastic optimization problems. Each unit produces a given target amount by a given due date (common to all units) and has several possible speeds, which are subject to disturbances. On the unit level, at each control point, decision-making centres on determining both the next control point and the speed to proceed with up to that point. The section level is faced with problems of either reallocating resources among the section's units or reassigning the remaining target amounts among the units so that the faster one will help the slower one. The company level is faced with similar problems, i.e. reallocating resources or reassigning target amounts among the sections. Two different cases are considered: (1) cost parameters are not taken into account, i.e. there are two conflicting objectives, namely to maximize the probability of completing the production on the due date and to minimize the number of control points, but the first objective is dominant; (2) the objective is to maximize the expected net profit. Various optimization problems at each level are presented. Examples from steel, construction and mining industries are given.     

Philosophical speculations on systems design

Belief in the value of the scientific method as a means of implementing improvement in social systems (here called “systems design”—SD) raises important philosophical questions concerning, inter alia, the meaning of “scientific method”, of “improvement”, and of social reality. One underlying problem is that of the “self reflecting paradox”; e.g. the content and validity of the scientific method can only be discovered by the application of the scientific method. Similarly, SD has its own “social reality” through which it perceives that of its client. “Improvement” is bound up with ethics but ethics does not admit the limitation of obligation to one sub-system, therefore improvement requires the recognition of sub-system linkages. Paradoxically, again, the “improver” is himself part of the total system and bears its impress. Implementation (of improvement) meets the paradox that SD on SD is needed to judge the worth of the SD proposal. The pragmatic escape from the paradox identifies SD with a heuristic role in social progress but presupposes the possibility of progress. “Implementation” secures the possibility of such progress. The second major problem is that SD requires a social reality in which individuals have visible goals; but the “inner world” of individual goals is unknown and cannot be tracked from observable responses. In any case, Kant's moral precept requires that individuals be valued as ends rather than means. Much of SD uses them as means. Though SD is and must be practised, such philosophical speculation raises SD's self knowledge and points the neat paradox of its technical precision won at the price of its fundamental woolliness.     

Situational production management: a practical theory for the development and application of production management

Discussions in journals and at conferences often nurture the dream of the ultimate method which may be applied successfully to all situations. Yet everybody knows that ‘it all depends’ and that situational factors determine which methods and systems are appropriate. This paper sets forth to outline a practical theory of a situational approach to production management. Any improvement of production management is seen as a dialogue between identification of the production management task, on the one hand, and specifying a solution system, on the other. A few concepts are introduced to provide practical methods for carrying out an improvement process; in particular, the nature of the production management task is addressed. The implications of the situational theory to be presented are discussed for three levels of application, respectively, the general level, the industry level, and the level of an individual industrial enterprise. It is further argued that the three levels are interdependent and that their joint application may stimulate both the theoretical and practical development of production management.