BSF-skeleton: A Template for Parallelization of Iterative Numerical Algorithms on Cluster Computing Systems

This article describes a method for creating applications for cluster computing systems using the parallel BSF skeleton based on the original BSF (Bulk Synchronous Farm) model of parallel computations developed by the author earlier. This model uses the master/slave paradigm. The main advantage of the BSF model is that it allows to estimate the scalability of a parallel algorithm before its implementation. Another important feature of the BSF model is the representation of problem data in the form of lists that greatly simplifies the logic of building applications. The BSF skeleton is designed for creating parallel programs in C++ using the MPI library. The scope of the BSF skeleton is iterative numerical algorithms of high computational complexity. The BSF skeleton has the following distinctive features. - The BSF-skeleton completely encapsulates all aspects that are associated with parallelizing a program. - The BSF skeleton allows error-free compilation at all stages of application development. - The BSF skeleton supports OpenMP programming model and workflows.Comment: Submitted to Methods

Функции интегративного поиска вузовских библиотечных порталов, построенных на основе J-ИРБИС 2.0

Integration of universities’ full-text and bibliographic resources is examined. The authors suggest using the hybrid model of aggregated-distributed retrieval and its realization. They also analyze functionalities and advantages of J-IRBIS 2.0 as an instrument to build web-portal of university libraries and the system of supporting services.Рассмотрены проблемы интеграции вузовских полнотекстовых и библиографических ресурсов. Предложено использование гибридной модели сводно-распределённого поиска и её реализации. Проанализированы возможности и отмечены преимущества J-ИРБИС 2.0 как инструмента для создания портала вузовской библиотеки и системы вспомогательных сервисов. Подчеркнуто, что благодаря возможностям этой системы интегративный поиск становится доступной технологией, которая может использоваться без привлечения технических специалистов и дополнительных финансовых затрат

Computing the broadband vibroacoustic response of arbitrarily thick layered panels by a wave finite element approach

A robust procedure for the prediction of the dynamic response of layered panels within a SEA wave-context approach is proposed hereby. The dispersion characteristics of two dimensional composite orthotropic structures are predicted using a Wave Finite Element method. By manipulating the mass and stiffness matrices of the modelled structural segment a polynomial eigenvalue problem is formed, the solutions of which correspond to the propagation constants of the waves travelling within the structure. The wavenumbers and group velocities for waves comprising out of plane structural displacements can then be calculated. Using the numerically extracted wave propagation data the most important SEA quantities of the structure, namely the modal density and the radiation efficiency of each wave type are calculated. The vibroacoustic response of the structure under a broadband diffused excitation is then computed within a SEA approach. The impact of the symmetric and the antisymmetric vibrational motion of the panel on its sound transmission loss is exhibited and the approach proves robust enough for thin as well as for thick layered structures