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.
18739764
New Branches, Old Roots: A Study of Methods and Techniques in Web/Hypermedia Systems Design
Abstract Despite claims in the literature that “traditional” methods and techniques are inadequate and poorly matched to the demands of the Web design context, the findings from a field survey of Web/hypermedia systems designers in Ireland indicate quite the contrary. in general, the notion of “method” in the traditional sense seems to have been largely displaced by hybrid aggregations of techniques and other method fragments – selected on the basis of usefulness and purposefully blended within an overarching framework of an in-house development process.
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.
7987492
Reconsidering the "Software Crisis": A Study of Hypermedia Systems Development
With the advent and growth of the Web, hypermedia information systems have propagated within and beyond organizations. Much concern has been expressed about the quality of hypermedia systems being developed and the apparent absence of disciplined development practices. There has been talk that the infamous “software crisis” is afflicting hypermedia systems development, allegedly brought about by shoddy project management, inadequate requirements analysis and planning, and ad hoc “quick and dirty” development approaches. This paper reports on the findings of a survey of 438 organisations in Ireland, the objectives of which were to test the validity of assertions of a “hypermedia crisis”, and to explore what mechanisms if any are being used to guide and control hypermedia systems development. The preliminary conclusions are that hypermedia development is much more disciplined that popularly believed, and the state of practice is much healthier than depicted by many academic researchers.
15327323
A comparison of 'traditional' and multimedia information systems development practices
Abstract As multimedia information systems begin to infiltrate organizations, there arises a need to capture and disseminate knowledge about how to develop them. Little is thus far known about the realities of multimedia systems development practice, or about how the development of multimedia systems compares to that of ‘traditional’ information systems. Herein are discussed the findings of a survey of multimedia developers in Ireland. Practitioners generally agree that systematic approaches are desirable in order to beneficially add structure to development processes, but they are predominantly using their own in-house methods rather than those prescribed in the literature.
18252922
Hypermedia systems development practices: a survey
Merely calling a system "Web-based" doesn't necessarily imply that its software design differs much from that of a traditional system. When Web-based systems assume hypermedia functionality they become substantively different from a design perspective. Hypermedia technologies support much richer user interfaces, more complex navigation mechanisms, and more varied forms of information than traditional computer systems. In recent years, hypermedia systems (particularly Web-based ones) have grown in complexity and scope as they've begun to involve critical organizational activities such as customer support, sales and marketing, and technical support.
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.
6040707
A Performance and Scalability Analysis of the BlueGene/L Architecture
Based on a set of measurements done on the 512-node 500MHz prototype and early results on a 2048 node 700MHz BlueGene/L machine at IBM Watson, we present a performance and scalability analysis of the architecture from low-level characteristics to large-scale applications. In addition, we present predictions using our models for the performance of two representative applications from the ASC² workload on the full BlueGene/L configuration of 64K nodes. We have compared the measured values for several of the benchmarks in our suite against the predicted numbers from our performance models. In general, the error bars were relatively low. A comparison between the performance of BlueGene/L and the ASCI Q, the largest supercomputer in the US, is presented, also based on our predictive performance models.
15721477
Implementation and performance modeling of deterministic particle transport (Sweep3D) on the IBM Cell/B.E
The IBM Cell Broadband Engine (BE) is a novel multi-core chip with the potential for the demanding floating point performance that is required for high-fidelity scientific simulations. However, data movement within the chip can be a major challenge to realizing the benefits of the peak floating point rates. In this paper, we present the results of implementing Sweep3D on the Cell/B.E. using an intra-chip message passing model that minimizes data movement. We compare the advantages/disadvantages of this programming model with a previous implementation using a master–worker threading strategy. We apply a previously validated micro-architecture performance model for the application executing on the Cell/B.E. (based on our previous work in Monte Carlo performance models), that predicts overall CPI (cycles per instruction), and gives a detailed breakdown of processor stalls. Finally, we use the micro-architecture model to assess the performance of future design parameters for the Cell/B.E. micro-architecture. The methodologies and results have broader implications that extend to multi-core architectures.
120859220
Analysis of trapped entanglements in polymer networks
This work reviews different standard methods to analyze trapped entanglements of polymer networks and discusses their advantages and drawbacks with respect to simplicity, computing time and accuracy of the results. Since this standard analysis is based on the pairwise test of closed cycles, two algorithms for the determination of these cycles are introduced and compared. The decomposition into meshes creates unsolved problems regarding the non-ambiguity and the completeness of the received results. Examples are given in order to show their effects and to start further discussion to receive more convenient methods. As one possible solution Vassiliev's invariants are discussed and an approximation method is introduced to correct the possible multiple counting of entanglements.
9385354
The Hugin Tool for Learning Bayesian Networks
In this paper, we describe the Hugin Tool as an efficient tool for knowledge discovery through construction of Bayesian networks by fusion of data and domain expert knowledge. The Hugin Tool supports structural learning, parameter estimation, and adaptation of parameters in Bayesian networks. The performance of the Hugin Tool is illustrated using real-world Bayesian networks, commonly used examples from the literature, and randomly generated Bayesian networks.