The paper presents a method of analyzing functionality aspects of complex information systems. The system analysis is based on integrating different computer system models, the networked systems and applications model...
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This work is devoted to some theoretical aspects of events monitoring in Complex Information Systems. Authors depict some aspects of nowadays monitoring systems that make them ineffective. Next, research areas are pre...
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In this paper, we present a distributed market-based algorithm called S+T, which solves the multi-robot task allocation (MRTA) problem in applications that require the cooperation among the robots to accomplish all th...
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In times of known hacking techniques as well as malicious software ubiquity, mostly commercialized information systems are seriously threaten. For this reason nowadays network security and dependable operation has bec...
In times of known hacking techniques as well as malicious software ubiquity, mostly commercialized information systems are seriously threaten. For this reason nowadays network security and dependable operation has become a major priority for design and implementation. Looking for powerful means network engineers started to often use computer simulation technique as a way for better understanding and development of complex computer systems. Therefore, plenitude of specialized development initiatives appeared in last few years. Currently network simulators are tools useful not only for creating new and better protocols, but also become money savers. By extending their functionalities e.g. post-processing capabilities for evaluating security and dependability metrics they turn out to be a fundamental state of the art network management platforms. This paper presents the information system, proposes metrics definitions, and describes the procedure of their evaluation using a simulator and a post-processing module.
To achieve fault-tolerance property of arithmetic circuits several approaches are possible, that differ in the level of hardware redundancy and the coverage of detectable faults. Among them only two are applicable to ...
To achieve fault-tolerance property of arithmetic circuits several approaches are possible, that differ in the level of hardware redundancy and the coverage of detectable faults. Among them only two are applicable to design of fast fault-tolerant adders. They exploit the concept of residue code or double-rail code. The complexity comparison of the respective fast fault-tolerant adders will be presented.
In this work we deal with a group of heterogeneous robots that cooperatively accomplish a task in a common area. For such a system, we develop a distributed control mechanism that ensures the correct coordination of t...
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In this work we deal with a group of heterogeneous robots that cooperatively accomplish a task in a common area. For such a system, we develop a distributed control mechanism that ensures the correct coordination of their concurrent motion in the shared workspace. The concept assumes an additional level of robot motion control, that enforces temporary velocity reductions in order to avoid collisions as well as deadlocks and livelocks among the robots. The event-driven mechanism underlying the developed model ensures a robust coordination of mutually asynchronous robot controllers, and the mathematical character of the employed abstraction formally guarantees the control correctness.
In the paper we explore relationships between autonomy, cooperation and dependability in wireless sensors network (WSN). We consider WSN as a set of sensors deployed insome area. These sensors must act autonomously an...
In the paper we explore relationships between autonomy, cooperation and dependability in wireless sensors network (WSN). We consider WSN as a set of sensors deployed insome area. These sensors must act autonomously and cooperatively to achieve both their particular self-interested and global goals. In proposed approach we determine cooperation and autonomy abstractions and consider them in the context of three basic relations (sub-ordination, tolerance, collision). In such way we expand 2D space (autonomy, cooperation) onto 3D partially or totally ordered relational space. Proposed conceptual framework provides a powerful paradigm to conceive, model, support and manage dynamically organising complex systems.
The paper presents a method of analyzing functionality aspects of complex information systems. The system analysis is based on integrating different computer system models, the networked systems and applications model...
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The paper presents a method of analyzing functionality aspects of complex information systems. The system analysis is based on integrating different computer system models, the networked systems and applications model, clients behavior model and collaboration between services in the analyzed system, into one coherent functionality based view suitable for system simulation. Modeling process incorporates hierarchical approach, i.e. the system is decomposed into groups of hosts and therefore groups of services, called molecules. The model is described in design by authors XML Domain Modeling Language (XDML). The integrated model is automatically transformed into an input file for modified SSFNet simulator. Additional information on input models could be read from other models or the user could play with all parameters of the XDML model. The paper presents developed software which implements described methodology and results of analysis for an exemplar information system.
A paper presents an approach to availability calculation of discrete transport system (DTS). The system is described by the formal model, which includes reliability and functional parameters of DTS. The availability a...
A paper presents an approach to availability calculation of discrete transport system (DTS). The system is described by the formal model, which includes reliability and functional parameters of DTS. The availability and average availability of the system - defined in a functional way - is discussed as a function of different essential parameters when the DTS is organized. The proposed analysis is based on the modeling and simulating of the system behavior. Monte Carlo simulation is used to encourage reliability and stochastic functional parameters. The simulator is built using scalable simulation framework (SSF). No restriction on the system structure and on a kind of distribution is the main advantage of the method. The paper presents some exemplar system modeling and results.
This paper deals with an intelligent algorithm dedicated for the use in manufacturing systems. Particularly, it develops the fast parallel tabu search algorithm to minimize sum of job completion times in the flow shop...
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This paper deals with an intelligent algorithm dedicated for the use in manufacturing systems. Particularly, it develops the fast parallel tabu search algorithm to minimize sum of job completion times in the flow shop scheduling problem. So called multimoves are used, that consist in performing several independent moves simultaneously, which allow one to guide very quickly the search process to promising areas of the solutions space, where good solutions can be found. Besides, an adaptable dynamic tabu list and varying neighborhood are proposed to avoid being trapped at a local optimum. The proposed algorithms are experimentally evaluated on a personal computer with duo-core processor and found to be relatively more effective in finding solutions of quality better than other leading approaches, and also it makes in a much shorter time. The presented ideas can be extended to cover search methods for other hard problems.
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