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Fast algorithms for computing parsimonious estimates of QoS measures

Fast algorithms for computing parsimonious estimates of QoS ...

引用

International Symposium on Communications and Information Technologies (ISCIT)

作者： Zalan Heszberger Jozsef Biro Vilmos Nemeth Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

In recent publications concerning quality of service (QoS) measures in communication networks several attempts have been made to improve the techniques of computing or estimating the quality of data transfer. Many of the promising results are based on the knowledge of only very few parameters on the traffic situation, some of which are known a priory, others are measured. The paper deals with such parsimonious estimation techniques of QoS measures under the bufferless fluid flow multiplexing (bffm) framework, and concentrates on the efficient computation of them. The proposed fixed-point recursive algorithms are actively used to put the implicit formulae or ones containing optimization tasks into real-time environment.

关键词： Quality of service Telecommunication traffic Traffic control Aggregates Fluid flow Capacity planning Bandwidth Computer networks Telecommunication computing Communication networks

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Mapping external functionalities into autonomic services

Mapping external functionalities into autonomic services

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Bio-Inspired Models of Network, Information and Computing Systems, BIONETICS

作者： Borbala Katalin Benko Robert Schulcz Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

ISBN: (纸本)9781424436491;9789639799059

In this paper, we present the functionality mapping model that is used in the CASCADAS ACE model: external code libraries are transformed into services of an autonomic element. CASACDAS is an EU 6 th Framework IST-FET project in the field of situated, autonomic communication; various research topics are organized around a common abstraction called Autonomic Communication Element (ACE). When designing this common abstraction, a big challenge is to define a natural, non-complex but flexible and expressive way for transforming existing code (libraries) into autonomic services of an ACE. In this paper, we introduce, explain, and discuss the developed model, and compare them with existing functionality mapping technologies.

关键词： Logic gates Biological system modeling Libraries XML Containers Java economics

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Improved microwave-optical reception applying double amplification in photo transistors

Improved microwave-optical reception applying double amplifi...

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Microwave, MTT-S International Symposium

作者： T. Berceli Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The detection efficiency of photo transistors is improved by a new approach. Its basic principle is the double utilization of the transistor gain mechanism. As a result a significant increase in the responsivity (e.g. 25 dB) is obtained in a narrow band. The new approach is advantageously applicable for the reception of subcarrier multiplexed signals.

关键词： Microwave transistors Signal detection Voltage Optical receivers Optical feedback Feedback loop Optical sensors Optical attenuators Optical noise Optical modulation

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Control possibilities of intersections based on estimated costs of traffic

Control possibilities of intersections based on estimated co...

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International Symposium on Applied Machine Intelligence and Informatics (SAMI)

作者： Adam Torok Ferenc Meszaros Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Road transport is one of the main inland transport modes providing flexible house to house services for the people all over the world Control of road traffic flows in urban areas in intersections are modelled in this article. Cost of CO 2 , CO, CH, NO x , PM and value of travel time had been used by the authors in order to estimate the cost of intersection. The article presents assumptions for constructing the controlling model and gives simulation results. Traffic flow parameters, such as traffic flow concentration and traffic flow speed are presented based on real traffic data of budapest.

关键词： Roads Green products Vehicles Fuels Cities and towns Biological system modeling Air pollution

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Normalizing OCL Constraints in UML Class Diagram-Based Metamodels - AND/OR Clauses

Normalizing OCL Constraints in UML Class Diagram-Based Metam...

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Eurocon

作者： L. Lengyel T. Levendovszky H. Charaf Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Software modeling means producing diagrams. A software diagram, such as a UML class diagram, in general, not refined enough to provide all the relevant aspects of a specification. We need a mechanism to describe additional constraints about the objects in the model. The object constraint language (OCL) is a formal language, OCL expressions are unambiguous and make the model more precise and more detailed. The navigations contained by the constraints increase the complexity of the constraint evaluation. This paper introduces the concept of AND/OR clauses and provides algorithms - constraint relocation and constraint decomposition - to eliminate navigation steps from the OCL constraints appearing in UML class diagram-based models

关键词： Unified modeling language Object oriented modeling Formal languages Navigation Metamodeling Software design Software systems Computer industry Software standards Standards development

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Physical Layer Considerations for Cognitive Radio: Synchronization Point of View

Physical Layer Considerations for Cognitive Radio: Synchroni...

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IEEE Conference on Vehicular technology (VTC)

作者： Zsolt Kollar Peter Horvath Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

In this paper, we briefly describe four modulation schemes (Orthogonal Frequency Division Multiplexing (OFDM), DFT-spread OFDM, Constant Envelope OFDM (CEOFDM)and Filter Bank Multicarrier (FBMC)) for Cognitive Radios (CR) in white space. In the first part, we give a short overview of the main signal processing blocks and signal properties. Then, we compare them by means of sensitivity to various synchronization errors such as timing error, frequency mismatch, phase noise and IQ-imbalance. These errors can be caused by either non-ideal analog components, movement of the transceiver or imperfect synchronization. Each synchronization error is examined separately; the performance is verified by means of bit error rates. Each modulation has a different sensitivity for a given type of synchronization error, which has to be taken into account when choosing the most suitable modulation scheme for a given application.

关键词： OFDM Modulation Baseband Bit error rate Receivers Synchronization

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New trend in teaching and learning environments for distance higher education

New trend in teaching and learning environments for distance...

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International Symposium on Applied Computational Intelligence and Informatics ( SACI)

作者： J. Gati Gy. Kartyas Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

An evergreen problem is application of information technology in teaching and learning processes. Very special data structures, communications, and algorithms are required. In higher education, long experience with distance learning and application of Internet environments generate new and new ideas and methods. A possible enhancement of model based virtual classroom methodology is discussed in this paper. New aspects of a well published approach and method are revealed. An introduction about possible solution of virtual classroom considering recent demand is followed by discusses and evaluations of components of model based classroom, classroom procedures, and constraining and structure of classroom model.

关键词： Computer aided instruction Computer science education Education courses Application software Information technology Internet Accreditation Educational technology Educational programs Electronic learning

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Real-time flow data analysis by GIS: Internet and WAP approach

Real-time flow data analysis by GIS: Internet and WAP approa...

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International Conference on Intelligent Transportation

作者： I. Fi A. Barsi T. Lovas Z. Siki G. Fordos Department of Highway and Railway Engineering Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Department of Photogrammetry and Geoinformatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Department of Geodesy and Surveying Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Department of Control Engineering and Information Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Due to the heavy traffic, people living in urban areas have to get used to congested roads, increased traveling time, and stressful situations. There is a strong demand on acquiring real-time flow data on actual traffic and road conditions. Our paper presents a method on acquiring several traffic data from different data sources, such as induction loop sensor data (vehicle volume, average flow speed, road occupancy), traffic monitoring video camera images, position data of the public transport vehicles and cabs, digital database of road construction areas. A technique to combine and analyze them in sophisticated GIS (Geographic Information System) environment is also presented in the paper. Our method involves state-of-the-art multimedia communication applications, including Internet and cell-phone based JAVA Mobile Edition systems. The actual flow information are represented in easy-to-understand color-coding on the maps.

关键词： Data analysis Geographic Information Systems Internet Road vehicles Urban areas Image sensors Digital cameras Image databases Information analysis Multimedia communication

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An Internet course for teaching basic MEMS technologies and applications: MEMSEdu

An Internet course for teaching basic MEMS technologies and ...

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Electronic Components and technology Conference (ECTC)

作者： G. Harsanyi P. Bojta P. Gordon H. Santha Department of Electronics Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Conventional teaching methods, based on lectures, static written materials, laboratories, etc., have become rather difficult at all levels of MST (microsystems technologies) education, recently. To supply this field with well-educated engineers with interdisciplinary knowledge, it is necessary to teach them basic sciences, technology, applications, and designing aspects (reliability, packaging, etc.) belonging to the topic of MST. Also the knowledge of user engineers should be upgraded-possibly in a form of distance learning. The main objective of the described project here is the development of a multimedia supported education material that teaches/overviews the theoretical background, manufacturing, as well as practical application of microelectronics, microelectro/opto/mechanical systems and their packaging technologies in order to prepare experts for designing next generation intelligent micro/nanointegrated systems in the new century. The new approach tries to exploit all advantages of multimedia computer aided teaching not only for keeping the competitiveness but also in order to overcome the specific difficulties of the particular area. The modern educational software tool can secure up to date information, easy-to-understand visualisation of the 3D MEMS structures and interactive examples of the subject. The course material will be available both on the Internet and on CDs for the technical community, for other university professors for teaching, and also will continuously be developed.

关键词： Internet Education Micromechanical devices Educational technology Reliability engineering Knowledge engineering Packaging Laboratories Design engineering Materials science and technology

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Physical Layer Considerations for Cognitive Radio: Modulation Techniques

Physical Layer Considerations for Cognitive Radio: Modulatio...

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IEEE Conference on Vehicular technology (VTC)

作者： Zsolt Kollar Peter Horvath Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Cognitive radio (CR) is one of the promising future possibilities for wireless broadcasting and communication. One of the key issues is the physical layer, where the modulation waveform best suitable for the CRs has to be chosen. In this paper we present the most promising modulation schemes with their advantages and disadvantages. Orthogonal frequency division multiplexing (OFDM) is the most favored modulation nowadays for high speed digital communications, but many other modulation techniques show advantages over it. Notably DFT-spread OFDM (DFTS-OFDM), Constant Envelope OFDM (CE-OFDM) and Filter Bank Multicarrier (FBMC).We give an overview of these schemes to see which is the most suitable with a given set of parameters or in a specific scenario. We compare these methods via spectral characteristics, signal metrics and system performance in the presence of non-linear distortions.

关键词： Peak to average power ratio Measurement Bit error rate Nonlinear distortion Phase modulation

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