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Modeling Medium Access Control (MAC) by Quantum Methods

Modeling Medium Access Control (MAC) by Quantum Methods

引用

IEEE International Conference on Intelligent Engineering Systems (INES)

作者： M. Berces S. Imre Department of Telecommunications Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Medium access control (MAC) is an important part of wireless telecommunication systems. The main goal of a MAC protocol is to provide the best usage of the common resources for the users. One of these resources is typically the communication channel. By quantum informatics and computation - that gain more and more attention - some calculations and algorithms may become more efficient. The possible implementation of a quantum based system would lead us to great benefits, by applying it to an already existing problem. We give a model for medium access control via quantum methods

关键词： Media Access Protocol Access protocols Quantum computing Wireless application protocol Telecommunication control Quantum mechanics Energy management Power system management Physical layer Communication channels

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Design Considerations of Small Size Reflective Type Pulse Oximeter Heads in Special Applications

Design Considerations of Small Size Reflective Type Pulse Ox...

引用

Electronics System-Integration technology Conference, ESTC

作者： Hunor Santha Norbert Stuban Gabor Harsanyi Department of Electronics Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Many pulse oximeter types are available on the market but development of reflective pulse oximeters is still required by health care players. An approach to determine optimal conditions of such measurements by means of objective methods and a pilot experiment is described in this paper. The optimal distance between the light sources and the detector and the optimal force to press a reflective pulse oximeter sensor head onto the skin are characterisable by the presented method and experimental setup. The preferable values are probably between 0.5-2 g/mm 2 but the distance between the light sources and the detector shifts this value and changes the length of stabile region of performance as well, however, observed phenomena indicate, that pressure value alone is not enough to normalize results and compare pulse oximetry measuring heads having significant difference in size

关键词： Blood Pulse measurements Head Consumer electronics Light sources Skin Length measurement Spectroscopy Arteries Extinction coefficients

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Detecting lesions in a mammogram

Detecting lesions in a mammogram

引用

IEEE Region 8 International Symposium on Video/Image Processing and Multimedia Communications (EURASIP)

作者： N. Szekely B. Pataki Budapest University슠of슠Technology슠and슠Economics Hungary

Computer-aided diagnostics has a growing importance in many medical applications, such as mammography. The main goal of computer-aided tumour-detection is to help radiologists by selecting only the suspected abnormal cases. Identifying abnormal tissues in a mammogram is a great challenge, where conventional image processing methods usually fail. Therefore special methods are needed, which combine the advantages of already known and newly developed image processing algorithms. In this work the possibilities of lesion detection are examined by first extracting the lesion from the background, then characterizing it on the basis of its shape. The achieved results are presented, respectively.

关键词： Lesions Histograms Image processing Mammography Shape Cancer detection Brightness Image databases Medical services Biomedical equipment

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Simulation of quantum key distribution with noisy channels

Simulation of quantum key distribution with noisy channels

引用

International Conference on Telecommunications (ConTEL)

作者： A. Pereszlenyi Department of Telecommunications Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

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Ensuring software quality by formal modeling

Ensuring software quality by formal modeling

引用

International Symposium on Applied Machine Intelligence and Informatics (SAMI)

作者： Zsolt Csuka László Lengyel Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Software quality is always the target of disagreement between developers and users because of its subjective nature. The problem with software quality is the lack of formal definitions. Furthermore, quality metrics are based on empirical indices. This paper presents a method to the application of formal modeling techniques in the subject of software quality verification. We give a high-level view of the approach, leaving the deep details for a later discussion. We also provide a short summary of Software Quality models and standards.

关键词： Unified modeling language Software quality Biological system modeling Q factor ISO standards Reliability

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Modeling Role-Based Privacy in Social Networking Services

Modeling Role-Based Privacy in Social Networking Services

引用

International Conference on Emerging Security Information, Systems, and Technologies (SecureWare)

作者： Gábor György Gulyas Róbert Schulcz Sándor Imre Mobile Innovation Centre Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

As social networking services are getting more and more common, the need for privacy enhancing options, sophisticated identity management and anonymity emerges. In this paper the authors propose using role-based privacy as a response for these needs and introduce a novel model called nexus-identity network that is capable of describing services extended with such functionality. The concerned principles of role-based privacy are conferred in the paper and criteria are presented for anonymity. Conforming to the criteria the authors suggest storing the profiles of different identities in a tree hierarchy in a user-friendly manner. The analysis of anonymity shows that the network has a structure that can be easily interpreted similarly to graphs representing connections in regular social networks. The ease of profile management and network visualization are advantages of the nexus-identity model which can make a social networking service privacy and user-friendly as well.

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Distance learning - how to use this new didactic method in education of electronics engineering?

Distance learning - how to use this new didactic method in e...

引用

Electronic Components and technology Conference (ECTC)

作者： Z. Illyefalvi-Vitez P. Gordon Department of Electronics Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Distance learning (DL) is an instructional delivery system that connects learners with educational resources. In microelectronics and microsystems interconnection and packaging technology, the preparation of electronics engineers for the ever growing requirements is especially a challenge for today's education, and there is an essential need for the application of advanced curricula and teaching methods. In the present paper, the driving forces for the development of curricula and didactic methods are outlined, followed by the detailed discussion of the needs for and the applicability of distance learning. Then, an example is provided for the application of the Internet-based performance centered instructions (IPCI) model for providing Web-based DL experiments in the special field of surface mounting technology (SMT) for students of electrical engineering and graduate engineers interested in microelectronics packaging and interconnection technology. Finally conclusions are drawn and further efforts are outlined.

关键词： Computer aided instruction Surface-mount technology Continuing education Microelectronics Knowledge engineering Gold Joining processes Web sites Electronics packaging Educational technology

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High frequency E-field probe

High frequency E-field probe

引用

International Spring Seminar on Electronics technology

作者： Z. Harasztosi Department of Electronics Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

ISBN: (纸本)0780371119

This paper describes the construction of a high frequency E-field probe produced using polymer thick film technology. The probe is the key element of a complex measurement system which examines the absorbed power caused by the electromagnetic field of cellular phone equipment. The measurement system meets the requirements of the CENELEC recommendations in this area. The probe measures magnitude of the high frequency E-field (in the range of GSM characteristic frequencies, 900/1800 MHz), converts it into a DC voltage, and transmits this voltage towards the next element of the measurement system. This paper shows the planning details of the probe, focusing on the fixing of electric parameters.

关键词： Probes Electromagnetic measurements Frequency measurement Frequency conversion Voltage Polymer films Thick films Power measurement Electromagnetic fields Cellular phones

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A Hierarchical and a Non-Hierarchical European Multi-Domain Reference network: Routing and Protection

A Hierarchical and a Non-Hierarchical European Multi-Domain ...

引用

NETWORKS International Telecommunications Network Strategy and Planning Symposium

作者： Diana Mesko Gabor Viola Tibor Cinkler Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Routing, TE & Resilience are gaining on their importance in heterogeneous networks. For testing network design and configuration tools, as well as for simulating routing algorithms and protocols in a realistic multi-domain reference environment a common reference network is necessary to estimate and compare the known and novel methods. Until now there have been three to five well known single domain reference networks. The most widely used one is the NSFnet the North-American academic network. The other two often used reference networks are the European COST 239 and the LION/COST 266 fictive Pan-European reference networks. Two national networks are also often used the Italian and the German one. However, all these networks consist of a single domain only. To our knowledge there is no reference network so far capable of taking into account the multi-domain and multi-provider character of modern networks. The aim of this paper is to fill this gap. We propose a non-hierarchical reference network (el-net-nh) and a hierarchical one (el-net-h) and compare them from the point of view of blocking ratio and path length distribution for two cases, namely, with no protection at all and with dedicated protection

关键词： Protection Network topology Costs Telecommunication traffic Testing Algorithm design and analysis Routing protocols Graphical user interfaces Traffic control Environmental economics

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Brave new world of telecom

Brave new world of telecom

引用

International Conference on Telecommunications (ConTEL)

作者： Gabor Nemeth Budapest University슠of슠Technology슠and슠Economics Hungary

The recent development In telecom has been the drive towards the integration of computing and phone and data communication. With the constant and fast development of technology the phone companies are trying to get a major share in television and advanced video services as well. At the same time cable services are moving towards phone and data services. The new goal is to provide the "triple play": voice, data and television. The main issues are discussed based on personal view of technological and other problems involved.

关键词： Cable TV Communication cables Internet telephony Costs Intelligent networks Bandwidth Environmental economics Telecommunication computing Data communication Video sharing

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