Vol. 8, No 4, 2004 < Volumes
(ISSN 1428-6394)

Contents:

  • Andrzej Maksymowicz From the Editor   abstract | full text
  • Marcin Jarząb, Jacek Kosiński and Krzysztof Zieliński Techniques to Improve Scalability and Performance of J2EE-Based Applications   abstract | full text
  • Jacek Cała and /Lukasz Czekierda Teleconsultations — Synergy of Medicine and IT Technology   abstract | full text
  • Kazimierz Balos, Dominik Radziszowski, Paweł Rzepa, Krzysztof Zieliński and Sławomir Zieliński Monitoring GRID Resources: JMX in Action   abstract | full text
  • Marian Bubak, Maciej Malawski, Katarzyna Rycerz and Michał Turała CrossGrid — Tools and Services for Interactive Grid Applications   abstract | full text
  • Marta Majewska, Krzysztof Krawczyk, Renata Słota, Jacek Kitowski, Ladislav Hluch\'y and Simon Lambert Information Searching for an Experience Management Platform of the EU Pellucid Project   abstract | full text
  • Włodzimierz Funika, Marian Bubak, Marcin Sm/etek and Roland Wismüller A Monitoring Platform for Distributed Java Applications   abstract | full text
  • Darin Nikolow, Renata Słota and Jacek Kitowski Performance Aspects of Data Delivery Using Hierarchical Storage Management Systems in the Grid   abstract | full text
  • Katarzyna Rycerz, Marian Bubak, Maciej Malawski and Peter Sloot Interactive Grid Computing: Adapting High Level Architecture-based Applications to the Grid   abstract | full text
  • Zbigniew /Lodziana Density Functional Simulation of Metal Oxides: Al2O3 and Fe3O4   abstract | full text
  • Tomasz Danek and Anna Franczyk Parallel and Distributed Seismic Wave-field Modeling   abstract | full text
  • Grzegorz Pszczoła and Andrzej Lesniak Non-linear Optimization Methods for Small Earthquake Locations   abstract | full text
  • Sławomir Moskal, Stanisław Bednarek and Janusz Adamowski Computer Simulation of the Working Cycle of a Quantum Controlled-NOT Gate with Two Coupled Quantum Dots   abstract | full text
  • Krzysztof Lis, Stanisław Bednarek and Janusz Adamowski A Numerical Solution of the Poisson-Schr\"odinger Problem for a Vertical Gated Quantum Dot   abstract | full text

Abstracts:

hAndrzej Maksymowicz From the Editor

 

hMarcin Jarząb, Jacek Kosiński and Krzysztof Zieliński Techniques to Improve Scalability and Performance of J2EE-Based Applications

This paper reports research on improvement techniques of scalability and performance of Java 2 Platform, Enterprise Edition, (J2EE) based applications. The study deals with operating systems and Java Virtual Machine (JVM) tuning, the setting of Enterprise Java Beans (EJB) Application Servers' configuration parameters and clustering methods. The theoretical principles of achieving high performance and scalability of J2EE Applications are considered. The experimental environment and scenarios are described. The experimental results of the considered techniques' evaluation are presented and analyzed.

 

hJacek Cała and /Lukasz Czekierda Teleconsultations — Synergy of Medicine and IT Technology

The combination of medical sciences with computer networks and computer telematics creates a wide spectrum of new applications called telemedicine. One of telemedical domains is making digitally represented medical data available to medical technicians and professionals from remote locations. It can improve health care and lower its costs. The application discussed it this article is remote access to patients' medical documentation, and DICOM [1] images in particular, for consultation purposes. The paper presents the research done so far by Distributed Systems Research Group (DSRG) in the area of telemedicine. It shows the functional evolution of applications designed and developed by the group. Starting from relatively simple Web-based services through dedicated access and consultation applications, DSRG has created a comprehensive and sophisticated environment called TeleDICOM, allowing participants from the distributed consultation team to diagnose patients in collaboration. Teleconsultation services, demanding as they are, should be designed with deep knowledge and experience in the area of medical data, distributed systems, computer networks and many others. All these issues have been considered in constructing the applications and discussed in the article.

 

hKazimierz Balos, Dominik Radziszowski, Paweł Rzepa, Krzysztof Zieliński and Sławomir Zieliński Monitoring GRID Resources: JMX in Action

This paper summarizes research on monitoring GRID resources, which resulted in the implementation of the JIMS system. It contains an overview of the most important architectural and software concepts that make the constructed system flexible and user-friendly. The paper evaluates JMX and Web Service technologies as foundations for implementing monitoring systems. Particular attention has been paid to system adaptability, autoconfiguration and interoperability.

 

hMarian Bubak, Maciej Malawski, Katarzyna Rycerz and Michał Turała CrossGrid — Tools and Services for Interactive Grid Applications

The CrossGrid Project aims to develop new Grid services and a tool environment for a representative set of interactive compute- and data-intensive applications. This paper presents the architecture of the software and a description of the functionality of the main components. The new tools and grid services are based on the Globus Toolkit and the EU DataGrid middleware. CrossGrid develops and operates a large international testbed, where the developed applications, services and tools are deployed and run.

 

hMarta Majewska, Krzysztof Krawczyk, Renata Słota, Jacek Kitowski, Ladislav Hluch\'y and Simon Lambert Information Searching for an Experience Management Platform of the EU Pellucid Project

The EU Pellucid project is developing an experience management system for public organizations with staff mobility. The paper presents an activity whitin the project focused on searching for information in repositories of documents. The project's background and the process of information searching are described. Ontological methods such as semantic annotation and similarity searching, as well as ontology- and full-text-based searching are presented. Monitoring of organizational repositories is discussed.

 

hWłodzimierz Funika, Marian Bubak, Marcin Sm/etek and Roland Wismüller A Monitoring Platform for Distributed Java Applications

This paper presents a new Java oriented monitoring infrastructure that enables tools to observe, analyze and manipulate the execution of distributed Java applications independent of implementation details like instrumentation of monitored entities, hardware platform and application libraries. Tools can access the monitored application via a standardized interface defined by an OnLine Monitoring Interface Specification (OMIS) and extended by a set of new Java-specific services relating to garbage collection, class loading, remote method invocation, etc. The new monitoring functionality can be applied for building various kinds of tools and for adapting the already existing ones, such as performance analyzers, debuggers, etc., working in the on-line mode.

 

hDarin Nikolow, Renata Słota and Jacek Kitowski Performance Aspects of Data Delivery Using Hierarchical Storage Management Systems in the Grid

Grid computing has recently gained in popularity. Grid applications can be very demanding of the data storage facilities in the Grid. The existing data grid services are often insufficient and additional optimization of the data access is necessary. This paper presents research concerning the optimization aspects of data management for Hierarchical Storage Management (HSM) systems in the Grid.

 

hKatarzyna Rycerz, Marian Bubak, Maciej Malawski and Peter Sloot Interactive Grid Computing: Adapting High Level Architecture-based Applications to the Grid

In this paper we present the design of a Grid HLA Management System (GHMS) supporting execution of High Level Architecture-based interactive applications in a Grid environment, while at the same time allowing for running HLA legacy codes to preserve backward compatibility with the HLA standard. In particular, we describe the following system components: an HLA-Speaking Service for multiple federates that interface the HLA application to the system, a Monitoring Service integrated with the OCM-G monitoring system and HLA-based Benchmark Services informing the Broker Service of what can be expected from the application's behavior.

 

hZbigniew /Lodziana Density Functional Simulation of Metal Oxides: Al2O3 and Fe3O4

The study of the metal oxides is a rapidly developing area of research. Below a theoretical method based on the density functional theory, common in studying ceramics, is briefly presented. Application of the theory to the surface and the bulk properties of alumina and magnetite are presented. Relaxation mechanism of two different surfaces of alumina and the (100) surface of Fe3 O4 are shown. The mutual stability of the α and θ phases of Al2 O3 is calculated.

 

hTomasz Danek and Anna Franczyk Parallel and Distributed Seismic Wave-field Modeling

Elastic or acoustic wave-field modeling is an important part of seismic exploration. It can be used during the planning, processing and interpretation stages of seismic investigation. First attempts of using wave-field modeling were undertaken in the seventies by Alford, Kelly and others [1, 2]. These attempts were restricted by the limitations of computers at that time. Even now, computation for models of the standard exploration scale could last many hours, and many days in case of longer recording times. One of the best methods to overcome this disadvantage is parallelization of computations [3, 4]. This paper presents the results of distributed parallelization of elastic and acoustic wave-field modeling based on a Parallel Virtual Machine.

 

hGrzegorz Pszczoła and Andrzej Lesniak Non-linear Optimization Methods for Small Earthquake Locations

The problem of locating mine tremors using P-wave arrival times is revisited in the paper. A multidimensional, global, non-linear, constrained optimization method is used as a minimization algorithm for tremor location.In order to see the general properties of the minimized function a few images showing its basins of attractions have been constructed. These pictures enable us to choose efficient algorithms needed to solve location problems. The classical genetic algorithm, pure random search and the most efficient multistart algorithm have been tested. Local minimization methods should be introduced to the location procedure to increase the efficiency of tremor location.

 

hSławomir Moskal, Stanisław Bednarek and Janusz Adamowski Computer Simulation of the Working Cycle of a Quantum Controlled-NOT Gate with Two Coupled Quantum Dots

We discuss a possible realization of a quantum controlled-NOT gate with the use of two coupled quantum dots. Transitions between quantum states of a computational basis are driven by the microwave π-pulse. The parameters of the proposed nanodevice have been optimized in order to make the operation cycle of the gate as short as possible. Numerical solutions of the time-dependent Schrödinger equation allow us to simulate transitions between the quantum states which correspond to the subsequent stages of the gate's operation. The performed time-dependent simulations are a test of realizability of the quantum controlled-NOT gate in the nanodevice.

 

hKrzysztof Lis, Stanisław Bednarek and Janusz Adamowski A Numerical Solution of the Poisson-Schr\"odinger Problem for a Vertical Gated Quantum Dot

We present a numerical solution of the Poisson-Schrödinger problem for a semiconductor nanostructure containing a single quantum dot. The main outcome of our work is the lateral confinement potential, which determines the electronic properties of the nanodevice. We study the real nanodevice with cylindrical symmetry, which allows us to solve the three-dimensional problem on a two-dimensional mesh. We discuss the self-consistency of the solution with respect to the distribution of ionized donors inside the nanodevice.

 

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