We are open to scientific cooperation. Please don't hesitate to send your proposal for talks and presentations at our seminar to scientific chief of seminar Dr. Yu.E.Gorbachev. E-mail: gorbachev@hm.csa.ru═

February 28, 2003,
11.00 a.m. Fontanka, 6

V. Marley, O. Korolev
Seminar: "Fondations of formalism for algorithmic nets. Methods of grafical conception for models on the basis of algorithmic nets and their program realization".

January 30, 2003,
12.00 a.m. Fontanka, 6

V. Korhov
Seminar: "Resource Management in the Grid environment"

The invention of metacomputing and introduction of Grid technologies to support distributed computations and data processing led to the necessity of significant changes in resource management strategies for distributed heterogeneous systems. These changes reflect the dynamic, shared and heterogeneous nature of Grid environment aiming at the provision of effective metascheduling mechanism for the new computing environment. This talk presents a review of resource management issues in Grid environments and the state of art in Grid resource management.

January 24, 2003,
11.00 a.m. Fontanka, 6

Ivan Nikitin
Seminar: "Hydrogen diffusion on a Pd(111) surface: Quantum transition state approach".
The self-diffusion of hydrogen on a Pd(111) surface is investigated for different temperature regimes and with a realistic ab initio potential. By means of the quantum transition state theory, the characteristic temperature domains for the diffusion process is found and, in particular, the crossover temperature T_c is determined. The classical and quantum results for the diffusion coefficient are compared. It is shown that the diffusion coefficient varies when the problem dimension is changed. In particular, it is demonstrated that the diffusion coefficient value obtained in one-dimensional calculations has been overestimated.

December 20, 2002
11.00 a.m. Fontanka,6

Seminar "Problems of Severe Accident Modelling for Nuclear Power Plants"

Leontjev Yuriy Gennadievich

Containment Aerosol Behaviour Modelling during Severe Accidents at NPP.

Ivkov Igor Mikhailovich

Modelling of Long-Term Containment Loading During Severe Accidents at NPP. Heat and Mass Transfer Aspects.

Vinogradova Irina Andreevna

3D-Modelling of Multi-Component Flows in Closed system of Interconnected Rooms for NPP Hydrogen Safety Problems.

December 15, 2002

Seminar "Problems of damage simulation on atomic power stations."

Djachkov Dmitry Alexandrovich

Calculations of iodine derivatives transport during severe accident inside containment in water-hydrogen reactors.

Calculations of iodine derivatives transport during severe accident inside containment is proposed. Essential part of calculation program is devoted to modeling of iodine compounds thermal and radiolytic reactions. It solves oxidation-reduction iodine interaction with water radiolysis product; with dissolved oxygen and hydrogen, as well as organics compounds. The model involves approximations for diluted aqua solutions, making possible a fine estimation of water radiolysis effect on iodine radiolysis interactions and comparative study of theoretical results against experimental data. Approach to solving of nonlinear differential equations system is used.

Yuriy Krilov

Simulation of 3-dimensional flows resulting from combustion of hydrogen-air-steam mixtures used in special computer program which is developing for the substantiation of NPP safety.

Altbregen M.A.

December 6, 2002
11.00 a.m.

Alexander Burdukov, FLEXTRONICS The SimFlex Group

Seminar "Distributed calculations in supply chain simulations"

The seminar is devoted to SimFlex technology and its evalution ways to distributed calculations. SimFlex is supply chan simulation software. This software enables companies to simulate supply chain dynamics, evaluate multiple planning criteria and real-world variations. The accuracy of the results generated by SimFlex enables companies to make strategic and cost conscious decisions on complex supply chain issues. Additionally, companies are able to understand potential impacts on the supply chain network as various market conditions change. The current implementation of supply chain simulation is single process based on event-time discontinuous algorithm. Currently, simulation engine migartion process has a place. This migration will allow to run parallel simulations of several models or several scenarios of one model. The final goal of simulation engine evalution is the migration from distributed calculations on model and model scenario levels to distributed calculations on atomic operations level.

November 29, 2002
11.00 a.m.

Dmitry Malashonok, IHPCDB SPbSPU

Seminar "Dynamic load balancing for distributed computer systems"

Fast grow of cluster and distributed computing and accompanying technologies stimulate the development of systems for effecient distribution of tasks for parallel programming applications on available computational resources. The feature of distributed computational networks consists in unbalanced load both on network level and on single system level. There are a two ways of load balancing. The statical one is realised in some batch query systems like Codine and DQS, while the dynamical one is realised in Condor environment. The needs in dynamic balance of parallel task is the main reason of development of Dynamite programm environment.

November 15, 2002
11.00 a.m.

I.V.Shoshmina, IHPCDB SPbSPU

Seminar "Concept of the grid-technology. Distributed computational resources management system Globus, as grid implementation."

Last years due to development of computer design, applications, communication, it became possible to integrate global distributed computational resources in a uniform computational system, the grid. Now the uniform computational system, the grid, doesn't exist. But there are a lot of activities for development the theoretical and practical basis to create such system. At the seminar you can familiarize with the concept of the grid. As practical realization of the grid there is suggested the system of managing of distributed computational resources Globus. There is discussed the problem of security, data storing, resource management, application inclusion and way of their decisions realized in the Globus. The point of assumed integration of the Dynamite to the Globus is considered.

May 8, 2001

G.Skvortsov,St. Petersburg State University

"Attainments systems and effective education technology"

February 28,2001 (Wednesday)
11.00-12.30 a.m., 2 lectures (30-45 mins) with a break

Prof.Peter Sloot, University of Amsterdam
1."Virtual Laboratories and Computational Steering"
2."N-body simulation on Hybrid Architectures"

December 19, 2000

G.Skvortsov,St. Petersburg State University
E-mail:G.Skvortsov@pobox.spbu.ru

"On noospherology"

December 7, 2000

A. Arkadov, Moscow

"Gemma 3D - geomertric modeling environment"

October 24, 2000

Denis Moskvin

Boundary conditions in physico-chemical gasdynamic problems.

September 19, 2000

Prof. Sergey Vakulenko

Systems with maximally complex dynamics

There exists classes of dynamical systems (reaction diffusion, coupled oscillators, neural networks ) which depending on its parameters generate all toplogical classes of structurally stable dynamics including some chaotic dynamics.

Some systems generating with maximally complex dynamics have a wonderful simple form. Its Construction is based on the ideas connected with 13 Problem of Hilbert solved by Kolmogorov.

I am going as well to pose some question that I cannot yet resolve but its solution can give drastical progress in practical applications.

July 18, 2000

Rodolphe Texier
E-mail:rodik@fn.csa.ru

Visual tool for preparation of distance learning courses.
Result of the work in the Institute.

The main objective is to create an interface helping a teacher with few knowledge about computer science to create an entire lesson about a specific subject. The software must be user friendly and intuitive. He must allow a great freedom of use, but the user shouldn't get lost inside. The use of HTML files makes the construction of the lesson easier, enables to update the structure of the lesson later, and generates by itself the final files valid for the server.

May 30,2000

Kogemyakin A.O.

"Decay of arbitrary stationary discontinuity"

Absract

The problem of interaction of two flat supersonic uniform flows of perfect inviscid gas meeting under some angle is considered. The analytical solutions determining a type of interaction and ratio describing boundaries of areas of initial parameters, in which there is a solution of a problem, are given.

May 23,2000 11-00

V.I.Zolotarev

University campus corporate network construction. Realization for Pererhoff division of StPGU.

March 14, 2000

Joint Seminar for High Performance Computing (russian version)

February, 8 2000

Tsarev V.A.

Russian State Hydrometeorological Institute, 98, Malookhtinsky Ave., 195196, St.Petersburg, Russia
e-mail: tsarev@sici.ru

Evolution of bottom lens from numerical simulation (Full paper in doc format 468 Kb )

Absract

Numerical investigation of bottom lens evolution near a horizontal and inclined bottom is performed. The simulation is done from the non hydrostatic model including non stationary non-liner motion equation with equation of mass conservation equation of salt advection and equation of state. Equation of motion and equation of the state are transformed to equation of vorticity and vector potential. >From calculations it is shown that for the case of horizontal bottom horizontal vorticity component axis after some period of periodic oscillations takes direction along horizontal density gradient. That determines a lens rotation in clockwise direction. For the case of inclined bottom additional component of horizontal density gradient connected with bottom inclination arises. That results in formation of horizontal vorticity with axis directed along bottom slop. This new vorticity component forms the lens along isobath translation. The vertical vorticity formation depends on divergence and convergence zones distribution. From calculations it appeared to play a secondary role in formation of lens motion.

February, 1 2000

Nikiforov I.N.
(St.Petersburg ElektroTechnical University)

Development tools for navigation processes in hypermedia systems.

October, 26 1999

Very-Low-Energy Electron Diffraction as a Probe for Electronic Structure of Solids

Unoccupied electronic states above the vacuum level determine the wavevector k in photoemission determination of band structure E(k) of solids. For many materials these states are far from free-electron-like and are characterized by k-dependent excited-state exchange-correlation. This work demonstrates that the most direct method to study unoccupied states is Very-Low-Energy Electron Diffraction (VLEED) at the energies below ~40eV. Use of the VLEED experimental bands as the final states in photoemission for the first time enables determination of the electronic structure with absolute 3D resolution in k. Besides these principles, the experimental techniques and theoretical approaches are presented, and applications to a wide range of materials are demonstrated.

Дифракция низкоэнергетических электронов как метод исследования электронной структуры тв рдых тел /по материалам докторской диссертации/

Незаполненные состояния выше уровня вакуума определяют квазиволновой вектор k при определении зонной структуры E(k) тв рдых тел методом фотоэмиссии. Для многих материалов эти состояния значительно отличаются от свободноэлектронных и характеризуются зависящим от k обменом-корреляцией возбужд нного состояния. В настоящей работе показано, что наиболее прямым методом исследования высоколежащих состояний является дифракция низкоэнергетических (до ~40 эВ) электронов. Использование экспериментальных высоколежащих состояний как конечных состояний фотоэмиссии впервые позволяет определять электронную структуру с абсолютным разрещением по тр хмерному k. Помимо общих принципов, представляются экспериментальная техника и теоретические подходы, а также демонстрируются применения к широкому классу материалов.

October 12, 1999
Alexander O. Galyukov

"Investigation of 3D fluid dynamics problems using locally adaptive tetrahedral grids."

Abstract: New finite-volume numerical metods will be presented for simulation of the low Mach number internal 3D flows and essentially unsteady 3D flows with shock waves using locally adaptive tetrahedral grids. Special attention will be paid to grid generation and adaptation algorithms for both steady and essentially unsteady flows with shock waves. Example applications demonstrate the methods efficiency.

October, 5 1999

Nikolai Viktorovich Serov, Library Support Foundation.

" Informational model for creative architecture of the computer (intelligent information server)."

September, 28 1999

"Claster computer systems"

1. "Modern state of parallel and claster computers" - Bogdanov A.V.
2. "Claster PARITET" - Baev K.B.
3. "PARITET. Results of benchmarking" - Korhov V.V.

September, 21 1999

Andrey O. Morozov.

Very low bit-rate digital video compression techniques.

June, 8 1999

Sergey V. Udaltsov

Using the Intelligent Software Agents in the Adaptive Distance Learning Systems. The report is dedicated to the Intelligent Software Agents (ISA) and their usage in Adaptive Distance Learning Systems. In the beginning, the concept of ISA is discussed, the classification is shown. Basic advantages of the ISA paradigm are considered, the general problems are enlisted. The second part is about the experience of application ISA to the distance learning environment. There shown the concept of the adaptive automated learning. The usage of the ISA for adaptive learning is shown. Finally, the prototype of the adaptive learning environment is discussed.

May, 18 1999
Savely Karshenboim

Presice physics of simple atomic systems.

May, 11 1999
E.M.Myasnikova

Spatio-temporal registration of images of gene expression patterns using splines.

April, 20 1999

N.M.Moskaleva

Branching processe simulation for Boltzman equation solution.

The Monte Carlo method based on modeling stochastic branching processes for solving problems of gas dynamics is suggested. It is known to solve the problems of radiation transfer for estimating small probabilities one often invokes a dual ("conjugate") problem. For the nonlinear Baltzmann equation a stochastic branching process playing a role in a dual stochastic process was constructed. A corresponding "conjugate" numerical scheme makes possible with high accuracy to estimate the solution of the Baltzmann equation and is efficient on estimating functionals where "tails" of the distribution are of great importance.

March 24, 1999

Algorithm of two level parallelisation with dynamic process reallocation for DSMC.

Igor Grishin, Lab of Monte Carlo Methods, IHPCDB

March, 9 1999