16451824
Web-based systems design: a study of contemporary practices and an explanatory framework based on “method-in-action”
This paper reports the findings of a detailed study of Web-based systems design (WBSD) practices in Ireland based on data collected over a 3-year period (2002–2005), the objectives of which were to (1) contribute towards a richer understanding of the current “real-world” context of WBSD by characterising the profile of a typical project (team size, timeframe, nature of requirements, etc.) and identifying the key challenges, constraints, and imperatives (i.e. “mediating factors”) faced by Web-based system designers, and (2) understand how those contextual parameters and mediating factors influence the activity of WBSD as regards the selection and enactment of whatever design practices are therefore engaged (i.e. the use of methods, procedures, etc.). Data was gathered through a survey which yielded 165 usable responses, and later through a series of semi-structured qualitative interviews. Using grounded theory, an explanatory conceptual framework is derived, based on an extension of the “method-in-action” model, the application of which to WBSD has not been previously investigated in depth. It is proposed that this framework of WBSD issues is valuable in a number of ways to educators, researchers, practitioners, and method engineers.
6168223
A Survey of Multimedia and Web Development Techniques and Methodology Usage
The authors present survey results which suggest that no uniform approach exists for multimedia systems development and that practitioners are not using the multimedia models cited in the literature. It is concluded that developers need new techniques that capture requirements and integrate them within a systems development framework.
18442685
Techniques and Methodologies for Multimedia Systems Development: A Survey of Industrial Practice
This paper tries to answer the question, how are multimedia systems being developed in practice? Herein are reported the findings of a preliminary postal survey of the top 1,000 companies from general industry and the principal 100 companies from the multimedia industry in Ireland, which reveal that there is no uniform approach to multimedia systems development and that approaches prescribed by the literature are not being used in practice. Nonetheless, the findings are clear that practitioners are favorably inclined toward the use of systematic methods and techniques for multimedia development. This survey paves the way for more detailed and insightful qualitative research into development practices.
11728820
The Hugin Tool for Probabilistic Graphical Models
As the framework of probabilistic graphical models becomes increasingly popular for knowledge representation and inference, the need for efficient tools for its support is increasing. The Hugin Tool is a general purpose tool for construction, maintenance, and deployment of Bayesian networks and influence diagrams. This paper surveys the key functionality of the Hugin Tool and reports on new advances of the tool. Furthermore, an empirical analysis reports on the efficiency of the Hugin Tool on common inference and learning tasks.
14275613
An empirical performance analysis of commodity memories in commodity servers
This work details a performance study of six different types of commodity memories in two commodity server nodes. A number of micro-benchmarks are used that measure low-level performance characteristics, as well as two applications representative of the ASC workload. The memories vary both in terms of performance, including latency and bandwidths, and in terms of their physical properties and manufacturer. The two server nodes analyzed were an Itanium-II Madison based system, and a Xeon based system. All memories can be used within both of these processing nodes. This allows the performance of the memories to be directly examined while keeping all other factors within a node the same (processor, motherboard, operating system etc.). The results of this study show that there can be a significant difference in application performance depending on the actual memory used - by as much as 20%. The achieved performance is a result of the integration of the memory into the node as well as how the applications actually utilize it.
53225813
Architecture - A performance comparison through benchmarking and modeling of three leading supercomputers: blue Gene/L, Red Storm, and Purple
15679317
Using Performance Modeling to Design Large-Scale Systems
A methodology for accurately modeling large applications explores the performance of ultrascale systems at different stages in their life cycle, from early design through production use.
34671312
Hugin - The Tool for Bayesian Networks and Influence Diagrams