A Multiple-Domain Matrix Support to Capture Rationale for Engineering Design Changes

2018 ◽  
Vol 18 (2) ◽  
Author(s):  
L. Siddharth ◽  
Prabir Sarkar
Keyword(s):  
Building Blocks ◽  
Knowledge Bases ◽  
Change Propagation ◽  
Design Environment ◽  
Web Based ◽  
Design Change ◽  
Design Changes ◽  
System 2 ◽  
Multiple Domain ◽  
Selection Of

Design changes are necessary to sustain the product against competition. Due to technical, social, and financial constraints, an organization can only implement a few of many change alternatives. Hence, a wise selection of a change alternative is fundamentally influential for the growth of the organization. Organizations lack knowledge bases to effectively capture rationale for a design change; i.e., identifying the potential effects a design change. In this paper, (1) we propose a knowledge base called multiple-domain matrix that comprises the relationships among different parameters that are building blocks of a product and its manufacturing system. (2) Using the indirect change propagation method, we capture these relationships to identify the potential effects of a design change. (3) We propose a cost-based metric called change propagation impact (CPI) to quantify the effects that are captured from the multiple-domain matrix. These individual pieces of work are integrated into a web-based tool called Vatram. The tool is deployed in a design environment to evaluate its usefulness and usability.

Predictabilty of Change in Engineering: A Complexity View

2005 ◽  
Author(s):  
Claudia Eckert ◽  
John Clarkson ◽  
Chris Earl
Keyword(s):  
Empirical Studies ◽  
Change Propagation ◽  
Design Change ◽  
Design Changes ◽  
Action Model ◽  
Static Background

Design changes can be surprisingly complex. We examine the problems they cause and discuss the problems involved in predicting how changes propagate, based on empirical studies. To assist this analysis we distinguish between (a) a static background of connectivities (b) descriptions of designs, processes, resources and requirements and (c) the dynamics of design tasks acting on descriptions. The background might consist of existing designs and subsystems, or established processes used to create them. The predictability of design change is examined in terms of this model, especially the types and scope of uncertainties and where complexities arise. An industrial example of change propagation is presented in terms of the background (connectivity) - description - action model.

A network-based four-phase routing approach of multisource design change propagation on complex products

Kybernetes ◽  
2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Na Zhang ◽  
Mengze Li ◽  
Haibing Ren ◽  
Yupeng Li
Keyword(s):  
Design Process ◽  
Phase Iii ◽  
Propagation Path ◽  
Change Propagation ◽  
Ant Colony Optimization Algorithm ◽  
Content Type ◽  
Design Change ◽  
Complex Product ◽  
Complex Products ◽  
Design Changes

Purpose The development of complex products and systems is a continuously iterative process from customer requirements to a mature design. Design changes derived from multisources occur frequently during the design process. Furthermore, change propagation will impose impacts on design costs and lead times. In view of this, how to predict and control the propagation of multisource design change to reduce the changes impact is an urgent issue in the development of complex product. Design/methodology/approach In this paper, a new four-phase routing approach based on weighted and directed complex networks is proposed for multisource design change propagation. Phase I: as the foundation of this research, a product network model is established to quantify describe the complex product. Phase II: the hub nodes are identified based on the LeaderRank algorithm, which can be regarded as multisource nodes of design changes. Phase III: a calculation method for change propagation intensity is proposed, which improves the systematicness and accuracy of the evaluation results. In this paper, change propagation intensity is defined by four assessment factors: importance degree of parts, execution time of design tasks, coupling strength between parts and propagation likelihood. Phase IV: a routing method of multisource design change propagation and ant colony optimization algorithm are proposed in this paper, which can solve the coupling conflicts among change propagation paths and improve the search efficiency by using the parallel search strategy. Findings The proposed method and another method are used to search the optimal propagation path of multisource design change of a motorcycle engine; the results indicate that this method designed in this study has a positive effect on reducing the change impact, market response time and product design costs when design change occurs in the products design process. Originality/value The authors find a new method (a network-based four-phase routing approach) to search the optimal propagation path of multisource design change in complex products design.

EVALUATION OF MECHANICAL SYSTEMS USED IN PERFUSION

1972 ◽  
Vol 68 (2_Supplb) ◽  
pp. S44-S73 ◽  
Author(s):  
Eugene F. Bernstein
Keyword(s):  
Mechanical Systems ◽  
Organ Perfusion ◽  
Critical Factors ◽  
System 2 ◽  
Common Problems ◽  
Mechanical Components ◽  
Perfusion Experiment ◽  
Selection Of

ABSTRACT Among the critical factors in organ perfusion are (1) the mechanical components of the system, (2) the composition of the perfusate, and (3) the perfusing conditions. In this review, particular consideration is given to the pump, the oxygenator, and cannulas in such systems. Emphasis is placed upon the selection of pertinent equipment for the goals of a particular perfusion experiment, based upon the criteria of adequacy of the perfusion. Common problems in organ perfusion are summarized, and potential solutions to the perfusion problem, involving either biologic or mechanical extracorporeal systems, are suggested.

scholarly journals Using Pade´ Approximants and Curve-fitting to Approximate Eigenvalues and Eigenvectors for Large Design Changes

1996 ◽  
Vol 118 (1) ◽  
pp. 151-153 ◽  
Author(s):  
J. M. Vance ◽  
J. E. Bernard
Keyword(s):  
Finite Element ◽  
Natural Frequencies ◽  
Solution Process ◽  
Mode Shapes ◽  
Eigenvalues And Eigenvectors ◽  
Computational Burden ◽  
Design Change ◽  
Design Changes ◽  
Develop Software ◽  
Unique Method

Our overall goal is to develop software that facilitates the interactive participation of the designer in the optimization process. We are focusing this research on problems which use finite element solutions as part of the objective function. One challenge to implementing interactive participation in these types of problems is the high computational burden of computing a finite element solution for each design change. The research presented here focuses on a unique method to develop fast approximations for natural frequencies and mode shapes which can be used to avoid the time-consuming re-solution process and which will facilitate interactive design for systems with even large design changes.

Exploring Effective Change Propagation in a Product Family Design

2017 ◽  
Vol 139 (12) ◽  
Author(s):  
Inayat Ullah ◽  
Dunbing Tang ◽  
Qi Wang ◽  
Leilei Yin
Keyword(s):  
Product Family ◽  
Design Structure Matrix ◽  
Change Propagation ◽  
Effective Change ◽  
Design Structure ◽  
Design Changes ◽  
Requirements Change ◽  
Change Impact ◽  
Design Requirements

Product family (PF) design is a widely used strategy in the industry, as it allows meeting diverse design requirements. Change propagation in any PF is difficult to predict. Consequently, while numerous design change management methodologies presently exist, their application is restricted to a single artifact. This issue is overcome in the present study. The proposed framework explores effective change propagation paths (CPPs) by considering the risks associated with design changes in the PF with the aim of minimizing the overall redesign cost. The propagated risk, which would result in rework, is quantified in terms of change impact and propagation likelihood. Moreover, a design structure matrix (DSM) based mathematical model and an algorithm for its implementation are proposed to investigate the change propagation across the PF. Finally, to demonstrate their effectiveness, a PF of electric kettles is examined in a case study. The study findings confirm that the proposed technique is appropriate for evaluating different CPPs in PF.

Sistem Informasi Geografis (Sig) Properti Di Kota Tanjungpinang Berbasis Website

2019 ◽  
Vol 8 (1) ◽  
pp. 39-47
Author(s):  
Zulfachmi ◽  
Angger Andrea Amanda ◽  
Dedy Jauhari
Keyword(s):  
Information System ◽  
Geographic Information System ◽  
Unified Modeling Language ◽  
Geographic Information ◽  
Web Based ◽  
Unified Modeling ◽  
The Public ◽  
Property Specification ◽  
System Requirements ◽  
Selection Of

The increasing need for property in Tanjungpinang City is very growing, especially in the housing sector. Selection of property based on location and facilities and infrastructure is always a consideration for the community in making decisions to buy a property. Difficulty finding property location information in a certain area often occurs, resulting in people not getting references about the properties offered in Tanjungpinang City. The purpose of this research is to create a web-based geographic information system (GIS) regarding the distribution of the number of properties on offer, especially in Tanjungpinang City using a web-based mapping approach. In the development of Property GIS the author uses the Waterfall method and in the analysis of system requirements it is modeled with UML (Unified Modeling Language) and implemented with the PHP programming language and MySQLI database. It is hoped that the results of making this property's geographic information system can help the public to find out information about the distribution of properties offered, such as the location of property coordinates, addresses, prices, property photos, property specification data and property developer data.

scholarly journals Methods and applications for visualization of SNOMED CT concept sets

2014 ◽  
Vol 05 (01) ◽  
pp. 127-152 ◽  
Author(s):  
E. Sundvall ◽  
K.R. Gøeg ◽  
A.R. Højen
Keyword(s):  
Content Management ◽  
Graph Layout ◽  
Snomed Ct ◽  
Focus Group Interviews ◽  
Web Based ◽  
Hierarchical Relations ◽  
Potential Applications ◽  
Group Interviews ◽  
And Training ◽  
Selection Of

SummaryInconsistent use of SNOMED CT concepts may reduce comparability of information in health information systems. Terminology implementation should be approached by common strategies for navigating and selecting proper concepts. This study aims to explore ways of illustrating common pathways and ancestors of particular sets of concepts, to support consistent use of SNOMED CT and also assess potential applications for such visualizations.The open source prototype presented is an interactive web-based re-implementation of the terminology visualization tool TermViz that provides an overview of concepts and their hierarchical relations. It provides terminological features such as interactively rearranging graphs, fetching more concept nodes, highlighting least common parents and shared pathways in merged graphs etc.Four teams of three to four people used the prototype to complete a terminology mapping task and then, in focus group interviews, discussed the user experience and potential future tool usage. Potential purposes discussed included SNOMED CT search and training, consistent selection of concepts and content management.The evaluation indicated that the tool may be useful in many contexts especially if integrated with existing systems, and that the graph layout needs further tuning and development.Citation: Højen AR, Sundvall E, Gøeg KR. Methods and applications for visualization of SNOMED CT concept sets. Appl Clin Inf 2014; 5: 127–152http://dx.doi.org/10.4338/ACI-2013-09-RA-0071

scholarly journals Duration and speed of speech events: A selection of methods

2015 ◽  
Vol 56 (1) ◽  
pp. 59-83
Author(s):  
Dafydd Gibbon ◽  
Katarzyna Klessa ◽  
Jolanta Bachan
Keyword(s):  
Software Tool ◽  
Worked Examples ◽  
Three Dimensions ◽  
Speech Technology ◽  
Web Based ◽  
Language Typology ◽  
Cart Analysis ◽  
Speech Timing ◽  
Speech Events ◽  
Selection Of

AbstractThe study of speech timing, i.e. the duration and speed or tempo of speech events, has increased in importance over the past twenty years, in particular in connection with increased demands for accuracy, intelligibility and naturalness in speech technology, with applications in language teaching and testing, and with the study of speech timing patterns in language typology. H owever, the methods used in such studies are very diverse, and so far there is no accessible overview of these methods. Since the field is too broad for us to provide an exhaustive account, we have made two choices: first, to provide a framework of paradigmatic (classificatory), syntagmatic (compositional) and functional (discourse-oriented) dimensions for duration analysis; and second, to provide worked examples of a selection of methods associated primarily with these three dimensions. Some of the methods which are covered are established state-of-the-art approaches (e.g. the paradigmatic Classification and Regression Trees, CART , analysis), others are discussed in a critical light (e.g. so-called ‘rhythm metrics’). A set of syntagmatic approaches applies to the tokenisation and tree parsing of duration hierarchies, based on speech annotations, and a functional approach describes duration distributions with sociolinguistic variables. Several of the methods are supported by a new web-based software tool for analysing annotated speech data, the Time Group Analyser.

scholarly journals Combining Decision Support Approaches for Optimizing the Selection of Bundles of Ecosystem Services

Forests ◽  
2018 ◽  
Vol 9 (7) ◽  
pp. 438 ◽  
Author(s):  
Marco Marto ◽  
Keith Reynolds ◽  
José Borges ◽  
Vladimir Bushenkov ◽  
Susete Marques
Keyword(s):  
Decision Support ◽  
Ecosystem Services ◽  
Pareto Frontier ◽  
Efficient Solutions ◽  
Decision Makers ◽  
Management Decision ◽  
Web Based ◽  
Spatial Logic ◽  
Alternative Solutions ◽  
Selection Of

This study examines the potential of combining decision support approaches to identify optimal bundles of ecosystem services in a framework characterized by multiple decision-makers. A forested landscape, Zona de Intervenção Florestal of Paiva and Entre-Douro and Sousa (ZIF_VS) in Portugal, is used to test and demonstrate this potential. The landscape extends over 14,388 ha, representing 1976 stands. The property is fragmented into 376 holdings. The overall analysis was performed in three steps. First, we selected six alternative solutions (A to F) in a Pareto frontier generated by a multiple-criteria method within a web-based decision support system (SADfLOR) for subsequent analysis. Next, an aspatial strategic multicriteria decision analysis (MCDA) was performed with the Criterium DecisionPlus (CDP) component of the Ecosystem Management Decision Support (EMDS) system to assess the aggregate performance of solutions A to F for the entire forested landscape with respect to their utility for delivery of ecosystem services. For the CDP analysis, SADfLOR data inputs were grouped into two sets of primary criteria: Wood Harvested and Other Ecosystem Services. Finally, a spatial logic-based assessment of solutions A to F for individual stands of the study area was performed with the NetWeaver component of EMDS. The NetWeaver model was structurally and computationally equivalent to the CDP model, but the key NetWeaver metric is a measure of the strength of evidence that solutions for specific stands were optimal for the unit. We conclude with a discussion of how the combination of decision support approaches encapsulated in the two systems could be further automated in order to rank several efficient solutions in a Pareto frontier and generate a consensual solution.

Evolution of Electronic Procurement in Egypt

2009 ◽  
pp. 349-371 ◽  
Author(s):  
Sherif Kamel
Keyword(s):  
Building Blocks ◽  
Business Environment ◽  
Success Factor ◽  
Technology Infrastructure ◽  
Web Based ◽  
Electronic Procurement ◽  
Critical Success ◽  
Efficiency And Effectiveness ◽  
Information And Communication ◽  
Online Business

Emerging information and communication technology is driving transformation and change in the cyberspace. Speed, competition and globalization are key factors for development and growth in the reengineered global business environment where electronic business promises to grow in volume helping the digital economy to mature and dominate. This chapter demonstrates the case of an Internet startup that capitalized on the opportunities presented by the information economy. Since its establishment in 2001, the business2business platform of speedsend.com pioneered the electronic procurement industry in Egypt through a customized Web-based platform. The transformation of classical emerging markets challenges into opportunities has been a critical success factor that related to all building blocks of the business venture including technology infrastructure deployment, community awareness, information availability, and cultural adaptation of the online business amongst others. The owners of Speedsend. com developed a set of models to drive down procurement costs while providing a practical and reliable electronic solution that can boost enterprise procurement efficiency and effectiveness and that could be appealing to a community that is known for being resistant to change and not really mature in terms of information technology adoption, diffusion and adaptation. The case focuses on the models deployed by speedsend.com demonstrating the internal and external challenges faced and lessons learnt.

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