Vladimir V. Monov

On the spectrum of convex sets of matrices

Let K be an arbitrary compact convex set of square matrices. This paper presents necessary and sufficient conditions for the spectrum of K to have no eigenvalues in a prespecified closed convex subset of the complex plane. The obtained result implies different criteria for analysis of the spectral set of K. In particular, we have formulated criteria for nonsingularity, inertia and Hurwitz stability of K which can be used in the robustness analysis of linear control systems with uncertain parameters.

On Some Properties of Convex Matrix Sets Characterized by P -Matrices and Block P -Matrices

In this paper, we consider convex sets of real matrices and establish criteria characterizing these sets with respect to certain matrix properties of their elements. In particular, we deal with convex sets of P-matrices, block P-matrices and M-matrices, nonsingular and full rank matrices, as well as stable and Schur stable matrices. Our results are essentially based on the notion of a block P-matrix and extend and generalize some recently published results on this topic.

Modeling of the hotspot load traffic for crossbar switch node by means of Generalized Nets

The apparatus of Generalized Nets is applied here to describe a PIM-algorithm for computing a non-conflict schedule for packet switch node. In the present paper we propose a family of patterns for nonuniform traffic simulation based on the hotspot traffic model. The results from computer simulations of the throughput on a switch node with these patterns are presented. The necessary computations have been performed on grid-clusters of CERN. Our simulations utilize the PIM-algorithm, specified by apparatus of Generalized Nets. It is shown that there is an upper bound on the throughput of PIM-algorithm for proposed family of patterns.

Grinding in Ball Mills: Modeling and Process Control

Abstract The paper presents an overview of the current methodology and practice in modeling and control of the grinding process in industrial ball mills. Basic kinetic and energy models of the grinding process are described and the most commonly used control strategies are analyzed and discussed.

Large-Scale simulation of uniform load traffic for modeling of throughput on a crossbar switch node

In the present paper we propose a family of patterns for uniform traffic simulating. The results from computer simulations of the throughput on a switch node with these patterns are presented. The necessary computations have been performed on grid-clusters of IICT-BAS and CERN. Our simulations utilize the PIM-algorithm for non-conflict schedule, specified by apparatus of Generalized Nets. It is shown that the usage of the suggested family of patterns enables us to evaluate the influence of large scale changes of the input buffer on the throughput.

Implementation of a Service Oriented Architecture in Smart Sensor Systems Integration Platform

The paper describes a new developed platform for smart sensor network (SSN) data integration based on Service Oriented Architecture (SOA). SOA is a software design and software architecture design pattern based on discrete pieces of software providing application functionality as services to other applications. This is known as service oriented technology which is independent of any vendor, product or technology. Our platform is layer based and defines Network Layer, Data Integration layer and Application layer. The proposed architecture improves the information flow, has ability to expose internal functionality, improves reliability and scale operations to meet different demand levels. The platform supports mechanisms for cooperative data mining, self organization, networking, and energy optimization to build higher level service structures. The development of applications is improved and simplified by the use of optional administration tools and components.

A Numerical Study of the Upper Bound of the Throughput of a Crossbar Switch Utilizing MiMa-Algorithm

In the present paper we propose a family of patterns for hotspot load traffic simulating. The results from computer simulations of the throughput of a crossbar packet switch with these patterns are presented. The necessary computations have been performed on the grid-cluster of IICT-BAS. Our simulations utilize the MiMa-algorithm for non-conflict schedule, specified by the apparatus of Generalized Nets. A numerical procedure for computation of the upper bound of the throughput is utilized. It is shown that the throughput of the MiMa-algorithm with the suggested family of patterns tend to 100 %.

Control system for “controlled impact” laboratory device

The “controlled impact” laboratory device is developed in Technical University of Sofia. The acceleration of impact bodies is realized by cold rocket engine, which is operated with compressed air. The control system of the device ensure impact velocity up to 8 m/s, and measurement of impact parameters - path, velocity, acceleration. The parameters of the control system and there accuracy are investigated.

New type electromagnetic drive for Braille screen

The graphical interfaces based on visual representation and direct manipulation of objects made the adequate use of computers quite difficult for people with reduced sight. Within the European Union, the problem with the access of blind people to computer resources is quite pressing. The main scientific aim here is: a concept for development, design and manufacture prototype of combined tactile-voice interface facilitating and allowing visually impaired people work with computers regardless of the user interface or operation system and oriented to graphical surfaces. Static force characteristics of recently developed permanent magnet linear actuator for driving a needle in Braille screen are presented.

A simulation study of the throughput of a crossbar switch node by means of periodic input patterns

In this paper a simple model for uniform traffic with periodic input patterns is suggested. Periodic input patterns (PI-Patterns) represent a further development of the family of patterns (S-Patterns) proposed in our previous investigations. Our simulation studies use the Generalized Nets (GN) model of the known PIM-algorithm. The simulation results of a GN-model using PI-Patterns are presented and compared with results obtained for S-Patterns. It is shown that the upper bound for the throughput of PIM-algorithm for the S-Patterns is the value of throughput for uniform traffic with PI-Patterns.