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1 – 10 of over 179000This paper presents a general conceptual framework for systems built up of elements causally coupled to each other, when such causal influence can be considered as to take place…
Abstract
This paper presents a general conceptual framework for systems built up of elements causally coupled to each other, when such causal influence can be considered as to take place through well‐defined channels connecting the elements. In Part I, general deterministic systems are treated and in Part II (appearing in the forthcoming issue) the treatment is confined to systems with elements exhibiting linear behaviour. Special attention is given to the relationship between element behaviour, system structure and system behaviour.
In Part I of this article equations have been developed describing the behaviour of general deterministic systems. These lines of thought are followed up below, and are especially…
Abstract
In Part I of this article equations have been developed describing the behaviour of general deterministic systems. These lines of thought are followed up below, and are especially applied to systems the elements of which exhibit linear behaviour. By applying Laplace transform theory, it is established that matrix products determining the system behaviour, the operations of which were to be interpreted symbolically in Part I, are no longer symbolic. It is also shown how a future system behaviour may be obtained as the convolution of vectors, depending on initial values, and a system weight function matrix, depending entirely on structural properties of the system and on element behaviour.
The purpose of this paper is to contribute to a growing body of research on the applicability of resource-based theory (RBT) to the information systems (IS) area. In particular…
Abstract
Purpose
The purpose of this paper is to contribute to a growing body of research on the applicability of resource-based theory (RBT) to the information systems (IS) area. In particular, the paper provides an understanding of the IS value creation process, and strategies for managing it by demonstrating the application of cross-impact analysis.
Design/methodology/approach
RBT and systems theory are adopted as a theoretical framework in this study. Cross-impact analysis is used as a method for investigating interactions among elements of an IS value creation system. These elements were identified through 22 semi-structured interviews with organisational stakeholders, and assessed in terms of direction and strength of their interactions, and depicted in a coordinate system.
Findings
The result of the analysis is a meaningful classification of elements in an IS value creation system as: levers, indicators, identities, buffers or trends, based on their position in the system. The results provide additional clarity and insights into the relationships between IS and organisational resources and their effect on IS value.
Research limitations/implications
The research findings have important implications for researchers and managers in terms of understanding the impact of interactions among IS and organisational resources on formulating successful strategies for managing the IS value creation system.
Originality/value
This study explores interactions among IS/information technology resources and organisational resources by using cross-impact analysis. It shows that interactions among the identified resources do have a major influence on the overall IS value creation system.
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Briefly reviews previous literature by the author before presenting an original 12 step system integration protocol designed to ensure the success of companies or countries in…
Abstract
Briefly reviews previous literature by the author before presenting an original 12 step system integration protocol designed to ensure the success of companies or countries in their efforts to develop and market new products. Looks at the issues from different strategic levels such as corporate, international, military and economic. Presents 31 case studies, including the success of Japan in microchips to the failure of Xerox to sell its invention of the Alto personal computer 3 years before Apple: from the success in DNA and Superconductor research to the success of Sunbeam in inventing and marketing food processors: and from the daring invention and production of atomic energy for survival to the successes of sewing machine inventor Howe in co‐operating on patents to compete in markets. Includes 306 questions and answers in order to qualify concepts introduced.
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Chongbin Zhao, G.P. Steven and Y.M. Xie
Extends the evolutionary structural optimization method to the solution for the natural frequency optimization of a two‐dimensional structure with additional non‐structural lumped…
Abstract
Extends the evolutionary structural optimization method to the solution for the natural frequency optimization of a two‐dimensional structure with additional non‐structural lumped masses. Owing to the significant difference between a static optimization problem and a structural natural frequency optimization problem, five basic criteria for the evolutionary natural frequency optimization have been established. The inclusion of these criteria into the evolutionary structural optimization method makes it possible to solve structural natural frequency optimization problems for two‐dimensional structures with additional non‐structural lumped masses. Gives two examples to demonstrate the feasibility of the extended evolutionary structural optimization method when it is used to solve structural natural frequency optimization problems.
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The analysis of plate systems (Figure 1) with mixed finite elements is limited to geometric smooth partial systems (Figure 1a) with continuous strains and stresses. This is due to…
Abstract
The analysis of plate systems (Figure 1) with mixed finite elements is limited to geometric smooth partial systems (Figure 1a) with continuous strains and stresses. This is due to the independent approximation of the parameters of the local generalized displacements (displacements, slopes) and generalized stresses (stress resultants at the cross‐section) in the nodes of the partial systems (Figure 1c). Owing to the simultaneous approximation, an additional static constraint of the generalized stresses, apart from the kinematic constraint of the displacements which is usual in the finite element methods, is needed at the assembly, so that discontinuities of the stresses resulting from the equilibrium conditions cannot be determined.
Presents a review on implementing finite element methods on supercomputers, workstations and PCs and gives main trends in hardware and software developments. An appendix included…
Abstract
Presents a review on implementing finite element methods on supercomputers, workstations and PCs and gives main trends in hardware and software developments. An appendix included at the end of the paper presents a bibliography on the subjects retrospectively to 1985 and approximately 1,100 references are listed.
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Josef Šandera and Michal Nicák
This article aims to discuss the construction of a system for temperature cycling, where Peltier elements are used as heating or cooling elements. This article describes the…
Abstract
Purpose
This article aims to discuss the construction of a system for temperature cycling, where Peltier elements are used as heating or cooling elements. This article describes the results and experiences based on several years of practice in the area of thermo-mechanical reliability of soldered joints on printed boards with SMD components.
Design/methodology/approach
The authors discuss the characteristics of the design, the threshold temperatures, dynamic properties of the system and, most importantly, the reliability and the useful life of the Peltier elements. The advantages and disadvantages of the system are mentioned as well as examples of use.
Findings
The utilisation of Peltier elements for temperature cycling is possible, but it is important to keep in mind that the reliability of the elements is similar to the reliability of the system, and therefore, it is essential to replace the defective Peltier elements during the cycling.
Research limitations/implications
The construction of system is very simply. It is necessary to ensure the Peltier elements with low dispersion parameters.
Originality/value
The system is very well suited for cycling of printed boards, especially one sided, multi-chip systems, COB systems, flip-chip embedded construction, etc. The system can be used in situations where it is possible to ensure an effective heat transfer and where extremely low temperatures are not required.
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Christer Osterman and Anders Fundin
Many organizations report difficulties in integrating lean. A possible cause could be that methods and tools do not support each other. The purpose of this research is, therefore…
Abstract
Purpose
Many organizations report difficulties in integrating lean. A possible cause could be that methods and tools do not support each other. The purpose of this research is, therefore, to explore the nature of the connections within the system. Understanding these provides practitioners with a better way of defining their system and offers researchers a conceptual model with a new way of understanding a company-specific production system (XPS).
Design/methodology/approach
The study is designed as a multiple case study with three organizations and, in total, 25 lean experts serving as respondents.
Findings
The connections between the elements of an XPS act as a duality based on a problem–solution (P–S) relation. These are categorized according to complexity and can be mapped into a conceptual model, where the connections can be either symmetrical or asymmetrical.
Research limitations/implications
The results provide a method to analyze causes and effects in an XPS and a conceptual model. Given the limitations of a multiple case study, future research should explore connections depending on a broader variety of contextual conditions.
Practical implications
The results present a way to avoid a cherry-picking problem through understanding connections between elements in an XPS. This provides a new way to understand the weaknesses of an XPS.
Originality/value
The research provides a new approach with insights on how to conduct research in lean production by facilitating how to understand and interpret connections between elements in a system.
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Peng Gaoliang, Gao Jun and He Xu
Modular fixture configuration design is a complicated task requiring both intensive knowledge and experience. Automated or semi‐automated computer‐aided modular fixture systems…
Abstract
Purpose
Modular fixture configuration design is a complicated task requiring both intensive knowledge and experience. Automated or semi‐automated computer‐aided modular fixture systems based on computer‐aided design packages do not appear to have made a significant impact within the manufacturing industry. Modular fixture designers still prefer traditional systems such as paper or physical model; as such models provide a more intuitive interaction and immediate feedback. The objective of the paper is to present an application of the desktop virtual reality (VR) to develop an interactive modular fixture assembly design system.
Design/methodology/approach
Desktop‐based friendly interface is designed and the low‐system requirement key techniques, namely assembly modeling and collision detection approach, to make proposed system run smoothly on a desktop PC, are presented.
Findings
The paper finds that the proposed system is an efficient tool for modular fixture configuration design.
Practical implications
The proposed system is a portable and affordable solution for modular fixture design.
Originality/value
A low‐cost VR application for modular fixture configuration design is presented.
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