Behzad Parviz

PROBABILITY-POSSIBILITY TRANSFORMATIONS: A COMPARISON

After a brief discussion of the relationship between probability theory and possibility theory, the paper overviews the various proposed probability-possibility transformations. Principles by which these transformations are justified are critically examined, which results in some conclusions as well as the identification of issues that require further research.

A note on the measure of discord

A new entropy-like measure as well as a new measure of total uncertainty pertaining to the Dempster-Shafer theory are introduced. It is argued that these measures are better justified than any of the previously proposed candidates.

RELATIONSHIP BETWEEN TRUE AND ESTIMATED POSSIBILISTIC SYSTEMS AND THEIR RECONSTRUCTIONS

This paper is a theoretical contribution to reconstructability analysis of possibilistic systems. A method to estimate a given possibility distribution from the associated observations is derived based on the one-to-one correspondence between possibility distributions and their basic probability assignments. It is shown that in this estimation the possibility value for a state is proportional to the frequency of the state in the observations which are drawn from nested state subsets. The order preservation relationship between a given (true) possibility distribution and its estimation is derived. Based on this preservation property, it is shown that the order in the distance from an original possibilistic overall system of their unbiased reconstructions from two alternative reconstruction hypotheses (structures) is preserved in the estimated systems domain. Particularly, it is proved that systems conceptualized in terms of possibility theory possess an important property: if a possibilistic system is perf...

A performance validation tool for J2EE applications

J2EE is the de-facto industry standard for implementing and scaling Java on the enterprise scale distributed systems. It is the result of strong industry collaboration. All involved is trying to make the technology J2EE commercially viable. This industry support has allowed J2EE to be based on the experience and expertise from leading designers of industry systems that are scalable, well integrated and provided a cross platform environment for application development, deployment and management. One of the major problems in building large-scale enterprise systems is managing the performance of the eventual solution. It is also true for J2EE based systems. This paper proposes an approach for accurate analysis of J2EE applications. It discusses the design of JPManager - a J2EE performance management system and related techniques, such as Java instrumentation, which is used in the JPManagers implementation

General reconstruction characteristics of probabilistic and possibilistic systems

Abstract The subject of this paper is a general empirical study of the reconstruction problem—one of two complementary problems of reconstructability analysis. After a brief overview of relevant concepts, the paper contains a description of the computer experiments performed and the experimental results obtained. These experiments were performed for systems conceptualized in terms of either probability theory or possibility theory. Contrary to all previous experiments in the area of reconstructability analysis, which were based on systems perfectly reconstructable from some subsystems, experiments described here are not idealized in this sense. The significance of the reconstruction principle of inductive reasoning, whose validity is confirmed by the experimental results obtained, is also discussed.

A survey of J2EE application performance management systems

J2EE components and APIs have remained largely unmined, and their potential as performance barometers therefore largely unrealized, because the tools businesses have traditionally wielded to service transactions - database servers, directory services, application servers themselves - have been unable to provide businesses and software developers the access they need to capture, measure, and optimize discrete transactions. Businesses that lack insight into J2EE components and APIs lack the ability to manage some of e-businesss most vital performance assets, assets that, when performing poorly or not at all, can down whole distributed applications. This paper discusses the requirements of J2EE application performance management systems and five commercial tools.

A collaboration-oriented software architecture modeling system

A critical issue for complex component-based systems design is the modeling and analysis of architecture. Architectural specifications of software systems show them as a collection of interrelated components, and constitute what has been called the software architecture level of software design. However, since most of software architecture modeling tools, such as rational software architecture (RSA), run as stand-alone programs, there are still some inconveniency and incapability in fields of team designing and data management. The JArchiDesigner System was designed as efficient, secure, and manageable networking JArchiDesigner system to support collaborative design process. With the JArchiDesigner System, multiple users are able to concurrently access and manipulate the same software architecture information stored in a server machine. This paper discusses the software architecture design and implementation of JArchiDesigner System