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The terms contents and structure need to be discerned. For example, the molecule of water consists of one atom of oxygen and two atoms of hydrogen. But, the structure of the water molecule requires to give mutual distribution, within the three dimensional space, of the three atoms that build that molecule. In such a case, the most frequently used form is the so called structural model of a molecule...
A major role playing by entanglement of quantum states in several, present day applications of genuine quantum technologies is briefly reviewed. Additionally, the notion and classification of multipartite entanglement has been presented. A new, monotone under (S)LOCC-operations measures of many-partite entanglement are defined and discussed briefly.
Simulations of standard 1D and 2D quantum walks have been performed within Quantum Computer Simulator (QCS system) environment and with the use of GPGPU (General Purpose Graphics Processor Unit) supported by CUDA (Compute Unified Device Architecture) technology. In particular, simulations of quantum walks may be seen as an appropriate benchmarks for testing computational power of the processors used...
Electronic circuits based on nanodevices and quantum effect are the future of logic circuits design. Today’s technology allows constructing resonant tunneling diodes, quantum cellular automata and nanowires/nanoribbons that are the elementary components of threshold gates. However, synthesizing a threshold circuit for an arbitrary logic function is still a challenging task where no efficient algorithms...
The quantum factorization is probably the most famous algorithm in quantum computation. The algorithm succeeds only when some random number with an even order relative to factorized composite integer is fed as an input to the quantum period finding algorithm. Moreover, post processing of the quantum measurement recovers the correct order only for some subset of possible values. It is well known that...
This paper describes an “Intelligent Tap” – hardware device dedicated to support real-time Ethernet networks monitoring. Presented solution was created as a student project realized in Institute of Informatics, Silesian University of Technology with support from Softing A.G company. Authors provide description of realized FPGA based “Intelligent Tap” architecture dedicated for Real-Time Ethernet network...
The paper presents new transmission procedures present in IEEE 802.11 standard and compares them to the “traditional” frame exchange method. On the basis of their operating rules, analytical equations are derived that allow calculate network efficiency or effective throughput. The throughput upper limit is also calculated and compared for all considered frame exchange procedures.
In all big, industrial systems standardization is necessary. It concerns also offshore systems. There are some ways to realize it: use existing standards and join them together in new functionality or find something new. OPC UA seems to be one of new possibilities. This article presents different offshore standards and how OPC UA can be used in this case, not only in control and supervisory systems,...
This paper shows how to use cloud computing to solve N-body problem. It presents an idea and implementation of cloud service based on Windows Azure Platform. Clients can access cloud service via Internet over HTTP protocol. They create computation tasks supplying simulation parameters such as number of steps, time step and XML file with body definitions (initial position, mass and velocity). Presented...
The paper describes a simple node designed to act as part of an experimental wireless mesh network. The node is based on Atmel AVR ATmega16 microcontroller and Hope Microelectronics RFM12B radio module. Along with technical details of the node, the network layer (addressing scheme and routing algorithms) is presented. Fundamental principles on wireless mesh networks are also presented. Experimental...
The paper presents considerations that refer to introducing the term “cost of redundancy”, and indicates general assumptions that allow defining this term and its quantitative determination. However, “the cost of redundancy” does not apply in this case to financial expenses but only time loses (temporal cost) associated with the use of redundancy in industrial real-time distributed systems. Several...
The evolution of software architectures led to the rising importance of the Service Oriented Architecture (SOA) concept. This architecture paradigm support building flexible distributed service systems. In the paper the architecture of service request distribution broker designed for use in SOA-based systems is proposed. The broker is built with idea of fuzzy control. The functional and non-functional...
In this paper, we present the results of the simulation of a wireless sensor network based on the flooding technique and SPIN protocols. The wireless sensor network was specified and verified by means of the TLA+ specification language [1]. For a model of wireless sensor network built this way simulation was carried with the help of specially constructed software tools. The obtained results allow...
During a computer network activity there are many events which occur in certain moments of time with a given likelihood. The statistical aspect of this can be described by a probability density function of a random variable connected with the event time. The function in many cases has a specific feature which is not covered by any well known probability distributions. It has two maxima, in particular...
Network transmission with real-time constraints appears to be very sensitive to the jitter – short time packet delivery delay. In this paper we describe several methods for estimating that phenomenon. We perform quantitative and qualitative analyses for the gathered data using modern measurement tool called OWAMP (one way ping) and stratum 1 Network Time Protocol (NTP) time server.
The paper presents problems of QoS (Quality of Service) predictability of network services (mainly in WAN environment). In the first part we present general remarks on QoS predictability problem, mentioning some research projects and available resources. The main part of the paper deals with QoS predictability in long-term as well as short-term viewpoints. We will try to answer a question: is it possible...
This paper illustrates the research results concerning the character of signals emitted by the selected microcontroller via the power supply lines. The main purpose of the study is to determinate the instruction that is currently realized by the microprocessor, based on the conducted emission in the power supply lines. The research results presented in the study indicate that there are the...
In this article the author analyze a problem of data integration in a computer distributed systems. Exchange of information between different levels in integrated pyramid of enterprise process is fundamental with regard to efficient enterprise work. Communication and data exchange between levels are not always the same cause of necessity of different network protocols usage, communication medium,...
A load balancing issue for heterogeneous web servers is described in this article. The review of algorithms and solutions is shown. The selected Internet service for on-line echocardiography training is presented. The independence of simultaneous requests for this server is proved. Results of experimental tests are presented.
Algorithms of queue management in IP routers determine which packet should be deleted when necessary. The article investigates the influence of packet rejection probability function on the performance, i.e. response time for in case NLRED queues. For standard NLRED the linear packet dropping function is replaced by a quadratic function. Solution presented in this article based on orthogonal polynomials...
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