Laboratory of Information Technologies

LCTA 1998 Annual Report

In 1998, the scientific programme of the Laboratory of Computing Techniques and Automation covered two first and two second priority topics of the "Topical Plan for JINR Research and International Cooperation". The main aim of the Laboratory is to obtain new results in the field of "Development and Maintenance of the Networking, Information and Computing Infrastructure at JINR (Project CONET)" ( leaders R.Pose and V.V.Korenkov) and on "Nonlinear Problems of Computing and Mathematical Physics: Investigation and Software" ( headed by I.V.Puzynin).

The main directions of the CONET project are as follows:

The top-level investigations performed at the LCTA Computational Physics Department allowed organizing the First International conference "Modern Trends in Computational Physics" in 1998. The scientific programme of Conference covered various fields of research in computational methods and tools for simulation and analysis of physical processes, mathematical modelling, numerical methods and algorithms, computer algebra methods, software for physics experiments, etc.

CONTENTS

NETWORKING , INFORMATION AND COMPUTING INFRASTRUCTURE AT JINR

JINR LOCAL AREA NETWORK

In 1998, three JINR Laboratories - LCTA, LNP and FLNP - put into operation the network equipment for the high-speed JINR backbone based on the ATM technology. Thus the first stage of the ATM project has been realized. The central servers segment also provides a way for the 100 Mbps and 155 Mbps connection. The JINR computing-networking infrastructure is shown schematically on Fig.1 (its status at the end of 1998).

JINR Networking

 Systematic work on the LAN management was performed by the Network Operation Centre (NOC) (http://noc.jinr.ru/). A database for the IP address registration (http://noc.jinr.ru/bin/restricted/ip.cgi) and for automatic DNS-files construction has been developed for the proper LAN operation.

TELECOMMUNICATION SYSTEMS

Since 1997, JINR has served as a RBNet node and uses for external telecommunications RADIO-MSU and DEMOS providers. The financial situation and the problems with the RADIO-MSU connectivity as well as the increasing number of computers and servers connected to JINR LAN are the main problems which lead to the unsatisfactory work of the external links to Internet. The main task to be accomplished in 1998 and in the future is to increase the telecommunication channel capacity and throughput by using new providers within the programme "Creation of a National Computer Telecommunications Network for Science and Higher School" and other programmes.

For the JINR traffic control, a specialized service has been organized. It provides an everyday monitoring of data transferred from each computer connected to the JINR LAN. The JINR traffic distribution for a sample period from 23.11.98 to 9.12.98 is illustrated by Fig.2.

Fig.2

Fig.2. External channel usage statistic from 22.11.98 to 9.12.98 (total). Summary = 75666,18M


COMPUTING SERVICE

In LCTA, a number of high-performance computing and file systems were established and started up this year:

The equipment listed above became a basis of the High-Performance Computing Centre (HPCC) in JINR/LCTA [1]. A presentation of HPCC took place within the programme of the 84-th session of the JINR Scientific Council. The local computer network connects in a uniform complex a massive parallel system Exemplar SPP2000, a vector-parallel system 3840, and an ATL2640 system of the information storage and migration controlled by a file server D370/1. Two technological circuits for data management are realized with the help of the systems HP OpenView OmniBackup and HP OpenView OmniStorage. In order to provide a reliable storage, a reserve copying is used. It is performed with the help of the program Omniback intended for automatic creation of reserve copies of the files of the library ATL2640 and operates at the D370/1 server. This allows one to carry out a reserve copying of contents of any server connected to the local network. It enables one to restore its contents and backup a copy from ATL in case of a server failure. The software HP OpenView OmniStorage is intended for the organization of a system for file migration. Now the users of remote workstations, PCs, and X-terminals may have very large virtual working directories.

The relative intensity of the SPP2000 and CONVEX computing servers usage by the Institute laboratories over the last 11 months is given on Fig.3.

Fig.3

SOFTWARE DEVELOPMENT

In 1998, for the newly established SPP2000 massive parallel system the following special arrangements were made:

- some additional OS checkout has been performed for the JINR networking environment due to its peculiarities;

- an ATM-based connection between the SPP and D-server robot has been installed and debugged;

- a large amount of additional software has been installed to make user's work easier (more than 50 utilities and libraries were put into operation). For example, a multi-purpose program intended for modelling a molecular structure of matter has been successfully installed at SPP. The program is capable of using all available SPP processors simultaneously. This is the first experience of converting very large programs to parallel ones at JINR.

The support of the JINR program library JINRLIB was continued. The main node of the library consisting of almost 85 programs was debugged. The results of the test operation on the IBM, VAX, SPP, Convex, and PC platforms were compared. All the programs have been transferred to double accuracy. The descriptions of the programs have been prepared in a unified format for the WWW. The support of CERNLIB on JINR computer platforms was provided.

A full-scale maintenance of NICE servers ( NICE_LCTA1 under Novell NetWare and NICE_LCTA0 under WindowsNT) were provided for JINR users.

A specialized UNIX environment was created on the basis of the WWW server http://linux4u.jinr.ru, that comprised:

In the context of JINR activities in the CMS Project, some hardware and software resources have been provided for the full participation of JINR specialists in the CMS experiment. The JINR's SUN-CMS cluster was made closer to the CERN one. LCTA also continues the information support for the CMS experiment (http://sunct2.jinr.dubna.su) [2].

According to the schedule of the development of the project on triggering and data acquisition T/DAQ of the ATLAS detector, in 1998 some proposals were worked out on a prototype of the Back-end software for T/DAQ [3]. A complete kit of the resource manager has been elaborated. The work has been performed according to the PSS05 standard and the StP/OMT application. It is in good agreement with the standards and rules of the program-oriented approach to software design stated at CERN.

The local RISK cluster is used as an effective instrument and a special-purpose tool for solving problems related to physical data processing. All processing of the experimental data obtained at the EXCHARM [4] is performed at this cluster using the BISON program. The RISK cluster is also used for modelling the experiments in the research of charmed and strange quarks at the Serpukhov accelerator.

DATABASES AND WWW SERVICE

The activities under the CONET project in 1998 have resulted in:

Figure 4 gives a general technological scheme of development and use of the databases at JINR.

Databases at JINR

Fig.4. A general technological scheme of development and use of the databases at JINR

COMPUTATIONAL PHYSICS

In 1998, work progressed on the development of new mathematical methods based on cellular automata, artificial neural networks, fractals, wavelets and their application in experiments DISTO, ATLAS, CERES/NA-45, DIRAC, STAR and in other fields for solving the problems arising in data processing [6]. In collaboration with the Torino department of INFN work has been started on the processing and statistical analysis of experimental data obtained in the DISTO experiment. The charged particle tracks recognition algorithm based on the Denby-Peterson segment model for a Hopfield type full-connected artificial network has been developed for the EXCHARM experimental data processing [7].

A local accuracy estimation procedure for the evaluation of 3D magnetic fields with the help of the finite element method have been developed. The offered algorithms are used for designing the dipole magnets of the VULKAN series for the ALICE experiment [8]. The calculations of magnetic fields for the EXCHARM experiment and the magnet for the proposed experiments with a polarized proton target on the ITEP accelerator have been carried out [9]. The problem of synthesis of passive focusing magnetic channels for the system of beam extraction from the U-400M cyclotron was considered for lower magnetic fields. For the wide range of external magnetic fields and sizes of ferromagnetic elements, a technique of an approximate calculation of a magnetic field was offered [10].

To provide a theoretical basis for the DIRAC experiment at CERN, some investigations have been performed. The effect of strong interaction on a dimesoatomic wave function at small distances has been investigated both analytically (perturbatively) and numerically [11].

The development of new numerical methods and computational schemes has been progressing. Methods increasing the accuracy of an approximate solution to the nonstationary Schroedinger equation have been developed. Effective schemes of the high order accuracy have been obtained [12].

Research of thermoelastic processes originating in metals and metal compounds at pulsed high-energy electron and ion irradiation has been carried out [13]. A numerical solution of the nonlinear equation of thermoconductivity has been performed to simulate the evolution of thermal processes induced on the metallic surface after its irradiation by a high-current ion beam[14].

The calculations and the half-microscopic analysis of experimental data on quasi-elastic scattering and full section have been performed for a plenty of systems. The densities constructed in nuclear-structural models and effective nucleon-nucleon forces were used [[15].

A program for construction on Lie superalgebras, superior in its parameters to other similar developments has been worked out [16]. The developed new universal involute algorithms for the analysis and solution of the systems of nonlinear algebraic equations are realized in the "Mathematics" system [17].

Mathematical simulation has shown that the use of 200 - 300 eV proton accelerators in subcritical electronuclear installations seems more promising in comparison with the complicated and expensive 1 GeV machines operating currently [18].

An elastodynamic method has been suggested that provides a proper account of the elastic properties of macroscopic nuclear matter revealed in recent data both on the collective nuclear dynamics and on the activity of neutron stars. The method is currently applied for the description of macroscopic dynamics of nuclear fission and for the analysis of gravitational-elastic stability of neutron stars [19].

Fig.5




New algorithms for the digital image filtering of both smooth images and images with sharp changes of intensity have been considered. The first results of their application (see Fig.5) to images of the human skin micro-structure obtained by optical coherence tomography have been presented at the First International Conference "Modern Trends in Computational Physics'' [20].
 
 

A method of the control and design of unstable dynamics based on a probabilistic coupling of distinct dynamical laws of evolution was presented and applied to the chaotic logistic map and to a model of interacting agents. As a result, the stabilization and control of the unstable orbits of the logistic map and the design of robust collective behavior of agents in 2 dimensions were obtained [21].

A new approach to reconstructing and predicting discrete chaotic maps has been developed. It is based on the feed-forward neural network which decomposes the analyzed map in orthogonal Chebyshev polynomials. It was shown that the Chebyshev neural network significantly exceeds the traditional multi-layer perceptron in learning rate and in accuracy of approximating an unknown map [22].

INTERNATIONAL COOPERATION

A number of joint investigations and developments were performed within the JINR programme for international cooperation in 1998. In particular, on an agreement with CERN

Cooperation started with the research center FZK Karlsruhe (Germany) in a research field called "Modern Control & Visualization Systems for Real -Time Data Acquisition". Work has been scheduled on the development of prototypes of the control & datamation system (KaDub). The technological basis of the project development has been agreed, and the GUI development started.

Within the agreement with the research center Rossendorf (Germany), joint research work was carried out on preparing the introduction of a Windows/NT based hard- and software environment allowing a unified approach to installation, maintenance, development and usage of the PC software.

Within the agreement with the University of Capetown (South Africa), research in modern magnetic materials for optical fiber communication links were carried out [23].

The effective cooperation with the International Salvay Institute of Physics and Chemistry (Brussels, Belgium) progressed in 1998 within a project "Computational Tools and Industrial Application of Complexity" . The project covers theoretical and numerical investigations that have found technological industrial use. Within the theoretical research, analytical and numerical algorithms are developed for study, predetermination of a behavior, design and control over complex systems of various types. Corresponding software is developed, and promotion of these developments for industrial use is under way. Besides JINR, research institutes of Japan, North and South America, Europe as well as five Russian institutes participates in the project. LCTA takes part in five of seven subprojects:

REFERENCES

1. Korenkov V.V. - Proc. of the Ann.Conf. on High Perf.Computing on HP Systems "HIPER98",1998, Zurich, pp.224-22.

2. Golutvin I.A. et al. - JINR, D11-98-122,Dubna, 1998.

3. Kotov V.M. et al. - In CHEP98 Proc., USA, 1998.

4. AlievA.N. et al. - "EXCHARM Spectrometer", JINR, 13-98-286, Dubna, 1998, subm. to PTE.

5. Raportirenko A.M., "Preparing of Digital Versions of Publications in the Publishing Department of JINR"; Gromov V., "JINR Photoarchive Database Creation"; Filosova I., "Digital Catalogue of Scientific and Technical Library of JINR" - In: Intern. Conf. "Digital libraries", 1998.

6. Baginyan S.A., Ososkov G.A. - Comp. Phys. Com., 1998, v.108, p.20;

Ivanov V.V. - "Computational Methods and Tools for Simulation and Analysis of Discrete Processes", subm. to Comp. Phys. Com.

7. Ososkov G.A., Palichik V .V. et al. - JINR, P11-98-194, Dubna, 1998, subm. to Math.Model.

8. Vodopianov A.S. et al. - "Computer Models of Dipole Magnets of a Series VULKAN", in print.

9. Zhidkov E.P. et al. - JINR, E5-11-98-113, Dubna, 1998.

10. Airyan E.A. et al. - JINR, P9-98-210, Dubna, 1998.

11. Amirkhanov I.V. et al. - In: Proc. of the Inter Workshop "Hadronic Atoms and Positronium in the Standart Model", Dubna, May 26-31, 1998, JINR, E2-98-254, Dubna, 1998, p.135; Amirkhanov I.V. et al. - hep-ph/9812293, subm. to Comp. Phys. Com.

12. Puzynin I.V. et al. - JINR Preprint, 11-98-44, Dubna, 1998, subm. to Com. Phys. Com.

13. Amirkhanov I.V. et al. - presented at " BEAMS'98 ".

14. Airyan E.A. et al. - To be publish. in Russ. Phys. J., 1998, v.25.

15. Knyaskov O.M. et al. - Nuclear Physics, 1998, v.61, p. 603,827.

16. Kornyak V.V. - "Computation of Cogomology of Lie Superalgebras of Vector Fields", subm. to Comp. Phys. Com..

17. Gerdt V.P., Blinkov Yu.A. - MATCOM 1998, v.45, p.519; Gerdt V.P. et al. - In: Proc. of the 6th Rhein Workshop on Computer Algebra, J.Calmet (Ed.) GMD-SCAI, Sankt-Augustin, 1998, p.74.

18. Barashenkov V.S., ShelaevI.A. - JINR Preprint, E2-98-137, Dubna, 1998; subm. to "Atomic Energy ".

19. BastrukovS.I. et al. - Physica,1998, v.A250, p.345; J.Phys., 1998, L1; J.Phys.G25 in print.

20. Akishin P.G. et al. - "Filtering Digital Images of Human Skin Micro-Structure", subm. to Comp. Phys. Com.

21. Antoniou I. et.al. - "Probabilistic Control and Design of Behavior in Unstable Dynamics", presented on IFAC LSS'98, Large Scale Systems: Theory and Applications, 1998, Rio Patras, GREECE, p.1100.

22. Antoniou I., Akritas P., Ivanov V. - "Identification of Chaotic Dynamics Using a Chebyshev Neural Network", presented on IFAC LSS'98, Large Scale Systems: Theory and Applications,1998, Rio Patras, GREECE, p.945.

23. Barashenkov I.V., Pelinovsky D.E., Zemlyanaya E.V. - JINR, E5-11-98-113, Dubna, 1998.


© Laboratory of Information Technologies, JINR, Dubna, 1999