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1 – 10 of over 194000Using the backdrop of an (apparently) extended visit to the West Indies, analogies with key concerns of internal audit are drawn. An unusual and refreshing way of exploring the…
Abstract
Using the backdrop of an (apparently) extended visit to the West Indies, analogies with key concerns of internal audit are drawn. An unusual and refreshing way of exploring the main themes ‐ a discussion between Bill and Jack on tour in the islands ‐ forms the debate. Explores the concepts of control, necessary procedures, fraud and corruption, supporting systems, creativity and chaos, and building a corporate control facility.
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Using the backdrop of an (apparently) extended visit to the West Indies, analogies with key concerns of internal audit are drawn. An unusual and refreshing way of exploring the…
Abstract
Using the backdrop of an (apparently) extended visit to the West Indies, analogies with key concerns of internal audit are drawn. An unusual and refreshing way of exploring the main themes ‐ a discussion between Bill and Jack on tour in the islands ‐ forms the debate. Explores the concepts of control, necessary procedures, fraud and corruption, supporting systems, creativity and chaos, and building a corporate control facility.
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I.N. Egorov, G.V. Kretinin and I.A. Leshchenko
Discusses a new approach to solving optimal designing and control problems in aircraft gas‐turbine engine components. This approach is a combination of optimal designing problems…
Abstract
Discusses a new approach to solving optimal designing and control problems in aircraft gas‐turbine engine components. This approach is a combination of optimal designing problems with optimal control problems, allowing the formation of a single problem of optimal designing of controllable systems. The solving of this problem would involve simultaneous optimization of both design parameters and control laws. Allows the making of technically correct and substantiated decisions, taking into consideration several efficiency criteria for gas‐turbine engine components; a specific feature being the determination of a set of competitive optimal solutions in terms of different efficiency criteria values. Demonstrates the effectiveness of this approach by an example of multicriteria design optimization of a controllable axial flow compressor. Presents the results of a search of compressor blade rows geometrical parameters sets and of compressor stator blades control laws which are Edgeworth‐Pareto optimal for four operating modes. Shows a possibility of increasing compressor efficiency considerably by choosing the most preferable design parameters set and implementing in airborne digital control system a number of control laws optimal for different operating modes.
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The librarian and researcher have to be able to uncover specific articles in their areas of interest. This Bibliography is designed to help. Volume IV, like Volume III, contains…
Abstract
The librarian and researcher have to be able to uncover specific articles in their areas of interest. This Bibliography is designed to help. Volume IV, like Volume III, contains features to help the reader to retrieve relevant literature from MCB University Press' considerable output. Each entry within has been indexed according to author(s) and the Fifth Edition of the SCIMP/SCAMP Thesaurus. The latter thus provides a full subject index to facilitate rapid retrieval. Each article or book is assigned its own unique number and this is used in both the subject and author index. This Volume indexes 29 journals indicating the depth, coverage and expansion of MCB's portfolio.
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This paper deals with the production and preventive maintenance planning control problem for a multi‐machine flexible manufacturing system (FMS). A two‐level hierarchical control…
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This paper deals with the production and preventive maintenance planning control problem for a multi‐machine flexible manufacturing system (FMS). A two‐level hierarchical control model is developed according to the discrepancy between the time scale of the discounting cost event and one of the machine state processes. The proposed model extends the classical singular perturbation approach by considering age‐dependent machine failure rates and controlling both production and preventive maintenance rates. We replace the stochastic optimal control problem by a deterministic one termed limiting control problem. With this approach, we compute an age‐dependent near‐optimal control policy of the stochastic initial control problem from the optimal solution of the equivalent limiting control problem. A numerical example is used to illustrate the procedure and to show the reduction of the control problem size.
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In the last four years, since Volume I of this Bibliography first appeared, there has been an explosion of literature in all the main functional areas of business. This wealth of…
Abstract
In the last four years, since Volume I of this Bibliography first appeared, there has been an explosion of literature in all the main functional areas of business. This wealth of material poses problems for the researcher in management studies — and, of course, for the librarian: uncovering what has been written in any one area is not an easy task. This volume aims to help the librarian and the researcher overcome some of the immediate problems of identification of material. It is an annotated bibliography of management, drawing on the wide variety of literature produced by MCB University Press. Over the last four years, MCB University Press has produced an extensive range of books and serial publications covering most of the established and many of the developing areas of management. This volume, in conjunction with Volume I, provides a guide to all the material published so far.
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Luis Silva‐Domingo and Teresa Canet‐Giner
The client‐supplier alignment problem is receiving growing attention in related literature and important contributions have been made for our understanding of the phenomenon…
Abstract
Purpose
The client‐supplier alignment problem is receiving growing attention in related literature and important contributions have been made for our understanding of the phenomenon. However, recent works agree on the fact that an integrative view of the problem is still lacking and consequently, a practical model is lacking also. The purpose of this paper is to present a new management control perspective that may help to improve understanding of the phenomenon.
Design/methodology/approach
From a review of the previous literature, the paper evolves into the conceptual development of a new model.
Findings
The paper argues that previous literature shows important limitations. First, its models try to find the best archetypes when evidence shows that no pure archetype can be found. Second, it has neglected the performance problem. Third, the suggested specific control mechanisms have been limited to the appropriation problem. In order to make a contribution, this paper presents an innovative and complete view of the client‐supplier alignment problem from a management control perspective that evolves into an integrative model which introduces the concepts of central misfit and management control paths.
Originality/value
The paper makes a contribution to the outsourcing literature by exposing previous biases and proposing an innovative view of the client‐supplier alignment problem. Moreover, the paper proposes a new model for the design of management control systems in order to improve performance. These contributions, although theoretical, could have a great practical impact as they could lead to a prescriptive model, useful for practitioners.
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Jelmer Marinus van Ast, Robert Babuška and Bart De Schutter
The purpose of this paper is to propose a novel ant colony optimization (ACO) approach to optimal control. The standard ACO algorithms have proven to be very powerful optimization…
Abstract
Purpose
The purpose of this paper is to propose a novel ant colony optimization (ACO) approach to optimal control. The standard ACO algorithms have proven to be very powerful optimization metaheuristic for combinatorial optimization problems. They have been demonstrated to work well when applied to various nondeterministic polynomial‐complete problems, such as the travelling salesman problem. In this paper, ACO is reformulated as a model‐free learning algorithm and its properties are discussed.
Design/methodology/approach
First, it is described how quantizing the state space of a dynamic system introduces stochasticity in the state transitions and transforms the optimal control problem into a stochastic combinatorial optimization problem, motivating the ACO approach. The algorithm is presented and is applied to the time‐optimal swing‐up and stabilization of an underactuated pendulum. In particular, the effect of different numbers of ants on the performance of the algorithm is studied.
Findings
The simulations show that the algorithm finds good control policies reasonably fast. An increasing number of ants results in increasingly better policies. The simulations also show that although the policy converges, the ants keep on exploring the state space thereby capable of adapting to variations in the system dynamics.
Research limitations/implications
This paper introduces a novel ACO approach to optimal control and as such marks the starting point for more research of its properties. In particular, quantization issues must be studied in relation to the performance of the algorithm.
Originality/value
The paper presented is original as it presents the first application of ACO to optimal control problems.
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Maciej Hojda and Jerzy Józefczyk
The purpose of this paper is to deal with a decision‐making problem in a complex operation system. Two levels of the system are made up of two different decision problems, i.e…
Abstract
Purpose
The purpose of this paper is to deal with a decision‐making problem in a complex operation system. Two levels of the system are made up of two different decision problems, i.e. task scheduling and task execution where by the latter an executor's movement control problem is understood. Interconnection of both levels creates a new problem that requires a new solution algorithm.
Design/methodology/approach
With use of a model of a moving vehicle in the state space, an offline movement control algorithm, is developed. Moreover, the concept of rescheduling to improve the solution through repeated execution of both, the movement control and the scheduling algorithms is used.
Findings
Decision‐making problem, and its substitutive version is defined. A solution is given for the substitutive approach along with its analytical evaluation. Furthermore, significant improvement of the solution through rescheduling has been achieved.
Research limitations/implications
Proposed approach to decision making creates a difficulty for generalization of the results on cases with a different movement model.
Practical implications
The methodology introduced in the paper can be applied prominently in flexible manufacturing systems with moving executors where it is either unfeasible to move the assemblage or the executors are capable of performing multiple tasks.
Originality/value
Solution to a decision‐making problem in a two‐level system, with the given vehicle model, and use of rescheduling for quality improvement was not considered beforehand.
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Overview All organisations are, in one sense or another, involved in operations; an activity implying transformation or transfer. The major portion of the body of knowledge…
Abstract
Overview All organisations are, in one sense or another, involved in operations; an activity implying transformation or transfer. The major portion of the body of knowledge concerning operations relates to production in manufacturing industry but, increasingly, similar problems are to be found confronting managers in service industry. It is only in the last decade or so that new technology, involving, in particular, the computer, has encouraged an integrated view to be taken of the total business. This has led to greater recognition being given to the strategic potential of the operations function. In order to provide greater insight into operations a number of classifications have been proposed. One of these, which places operations into categories termed factory, job shop, mass service and professional service, is examined. The elements of operations management are introduced under the headings of product, plant, process, procedures and people.