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Theoretical foundation of a knowledge-based intelligent network model

Theoretical foundation of a knowledge-based intelligent netw...

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International Conference on Software, Telecommunications and Computer Networks (SoftCOM)

作者： Gabor Nemeth Budapest University슠of슠Technology슠and슠Economics Hungary

The next generation of intelligent systems provides information processing, retrieval and transfer services for an arbitrary number of users in a transparent way. The structure of large networks is dynamically changing because of failures and modifications. Besides, it must support user mobility as well. The information to be handled extends beyond the traditional fixed type precise and deterministic information, approximating the ones used in natural languages. Such a system cannot be handled by the classical models. The intelligent system can be modelled as having logical, temporal and topological structures together with operations on these structures. The architecture proposed is based on the demand driven information processing model with static or dynamic task allocation over inhomogeneous or homogeneous resource types and network structures. The processing nodes may employ any mix of the four basic information processing models (control, data, demand and information driven models). Introducing a model time as a partially ordered set of events, an evolutionary system can be considered, both in its capabilities and structure. The services of the intelligent system are provided by intelligent mobile agents.

关键词： Intelligent networks Intelligent systems Information processing Intelligent agent Information retrieval Natural languages Intelligent structures Resource management Process control Mobile agents

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Investigation of route choice behaviour in passenger transport

Investigation of route choice behaviour in passenger transpo...

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International Symposium on Applied Machine Intelligence and Informatics (SAMI)

作者： Adam Torok Ferenc Meszaros Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The continually increasing population, the rising economic activity and the permanent race for the rise of economic prosperity, led us to the increase of motorisation. Transportation sector has an important role, because it is not only using the lacking fossil energy sources and polluting the environment, but because of our social and economic structure it is the sector that can hardly change because of the big social resistance. One of the substantial preconditions for the change into an environmental friendly, sustainable system is correct data provision to the regulator (quality and quantity as well). One way for reduction of transport related environmental pollution is to give right price signal to the users with internalisation of transport related external costs. In our article we tried to examine the route choice behaviour in Hungary focusing on toll roads. Our aim in this paper is to analyze the correlation of control possibilities of such econometric phenomena with mathematic tools.

关键词： Petroleum Automobiles Econometrics Power generation economics Environmental economics Road transportation Elasticity Costs Pollution Vehicles

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TFRC and RTT thresholds interdependence in a selective retransmission scheme

TFRC and RTT thresholds interdependence in a selective retra...

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IEEE Symposium on Computers and Communications (ISCC)

作者： Arpad Huszak Sandor Imre Department of Telecommunications Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Retransmission based error recovery is not always applicable for multimedia applications; however it can be used if the transmission characteristics and network conditions are examined before. Retransmissions can be carried out only if there is no congestion in the network and the network delay is low enough to receive the retransmitted packet before the playout. These two attributes are depending and one can be estimated from the other. In this paper we introduce a TFRC and RTT threshold interdependence model to determinate network delay thresholds for the retransmission decision algorithm. Using the calculated sending rate of the TFRC (TCP Friendly Rate Control) to estimate the congestion level in the network, we can set up a threshold of disabling/enabling the retransmissions. Our goal was to determinate a matching RTT threshold to gain similar retransmission behavior as using the sending rate threshold. We found that using our threshold estimating model, the number of retransmitted packets was similar, using the TFRC-based sending rate threshold and the RTT retransmission threshold.

关键词： Delay estimation Transport protocols Telecommunication congestion control Fluctuations History Loss measurement Throughput Analytical models Radio link Bandwidth

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Testbed of a Novel Media Streaming Architecture for Heterogeneous Wireless Environment

Testbed of a Novel Media Streaming Architecture for Heteroge...

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International Conference on Testbeds and Research Infrastructures for the Development of Networks and Communities (TRIDENTCOM)

作者： Laszlo Bokor Laszlo Lois Csaba A. Szabo Sandor Szabo Department of Telecommunications Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The paper presents the testbed of a novel network architecture which aims at providing streaming media services in a heterogeneous environment where the subscribers are roaming among different wired/wireless access networks including ADSL, WiFi, 2.5G and 3G cellular and WiMAX. The architecture provides seamless connectivity during roaming, with adapting the quality of the delivered media stream to the changes of the network characteristics and to the capabilities of a wide variety of devices. The paper presents general design considerations, focuses on a novel vertical handover mechanism, its implementation and evaluation in the testbed, as well as discusses media processing aspects. The different subsystems are currently being integrated into a single testbed which will provide an open environment for experimentation and will be suitable for technology transfer to network service providers and content providers.

关键词： Streaming media Testing Nonhomogeneous media Wireless networks Roaming Quality of service Wireless LAN Paper technology Environmental economics Cellular networks

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Model based torque estimation of Permanent Magnet Synchronous Machines

Model based torque estimation of Permanent Magnet Synchronou...

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IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives (SDEMPED)

作者： Andras Zentai Tamas Daboczi Budapest University슠of슠Technology슠and슠Economics Hungary

This paper reports advances in model based machine torque estimation used in electronic power assisted steering systems. Using machine input voltages the permanent magnet synchronous machine internal states and the output torque can be estimated. This technique can be used to detect machine failures and also can be used to verify the failure of the machine current measurement sensors.

关键词： Permanent magnet machines Power system modeling Torque measurement Pulse width modulation Safety Inductance Current measurement Automotive engineering Costs Sensor systems

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Accuracy of random walk and Markovian mobility models in location prediction methods

Accuracy of random walk and Markovian mobility models in loc...

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International Conference on Software, Telecommunications and Computer Networks (SoftCOM)

作者： Peter Fulop Sandor Szabo Tamas Szalka Department of Telecommunication Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Recent wireless networks offer more bandwidth than ever. High quality services are developed and provided by the operators, the number of users is constantly increasing. As the transferred data and the number of terminals are growing, the network providers have to face the increasing complexity of the network management and operation tasks. In this paper we observe the estimation and prediction of users' distribution in a cellular network. We compare the accuracy of mobility models serving for location prediction with our enhanced user motion prediction algorithm.

关键词： Predictive models Prediction methods Bandwidth Wireless sensor networks Degradation Economic forecasting Wireless networks Land mobile radio cellular systems Prediction algorithms Multiaccess communication

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Improving the frequency stability and phase noise of opto-electronic oscillators by harmonic feedback

Improving the frequency stability and phase noise of opto-el...

引用

Microwave, MTT-S International Symposium

作者： T. Banky T. Berceli B. Horvath Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Optical technology offers a new method for generating microwave signals with extremely low noise. For that purpose a long fiber is used in the feedback loop of the oscillator. However, by the application of a long fiber, a lot of resonances appear in the output spectrum impairing the stability of oscillation. This paper introduces two new approaches for improving the frequency stability and reducing the phase noise of opto-electronic oscillators. That goal is achieved in two different ways: one by the insertion of an additional third-harmonic optical loop and another by nonlinear electronic feedback techniques. This way the conversion between the fundamental and harmonic components in the nonlinear active element of the oscillator can be controlled and utilized both for improving the frequency stability and reducing the noise. The combination of these methods results in an optimum adjustment.

关键词： Frequency Stability Phase noise Optical feedback Optical noise Microwave oscillators Fiber nonlinear optics Nonlinear optics Feedback loop Microwave technology

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Knowledge on knowledge in knowledge portal

Knowledge on knowledge in knowledge portal

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International Conference on Information technology Interfaces

作者： Z. Baracskai J. Velencei Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Knowledge has become the most important producer of wealth in society and in organizations. Corporate success in today's economy comes from being able to acquire, codify, and transfer knowledge more effectively and with greater speed. Important aspect of knowledge management is extraction of the personal tacit knowledge and putting it into words and order, so that others can attain it and use it. Big enterprises need concept maps. In places where the knowledge workers are familiar it is a waste of money. Where more than 200 people use knowledge it is very time demanding to find requisite knowledge

关键词： Portals Knowledge management Taxonomy Collaborative work Knowledge engineering Data visualization Prototypes Cultural differences Global communication Warehousing

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Low-voltage, Low-power Solutions For Wireless Autonomous Sensors Aimed For Ami Applications

Low-voltage, Low-power Solutions For Wireless Autonomous Sen...

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International Conference on Mixed Design of Integrated Circuits and Systems (MIXDES)

作者： G. Nagy A. Poppe Budapest University슠of슠Technology슠and슠Economics Hungary

This paper deals with the RF communication issues of low-voltage, low-power autonomous sensors. The sensors gather all or part of the energy needed for their operation from the environment, thus challenging the design engineers to find ultra low-power solutions. A major part of the power consumption of autonomous sensors is drawn by the communication circuitry, thus it is of great importance to find the optimal modulation scheme and structures. Three analog multipliers were investigated from the aspect of consumption and an alternative communication method is also presented

关键词： Wireless sensor networks Ambient intelligence Temperature sensors Energy consumption Radio frequency Circuits Humans Voltage Temperature measurement Power generation economics

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Technical requirements in enterprise resource planning systems

Technical requirements in enterprise resource planning syste...

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International Spring Seminar on Electronics technology

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

An enterprise resource planning (ERP) system is defined as a unified information system, performing all information-processing tasks of a company and realizing an integration of the whole corporation. The aimed scope of duties indicates that these software products are very complex regarding their structure and operation. What is more, ERP systems are almost always standard software products. The parametrizable and configurable structure increases their complexity. We analyse these complex software products. We examine the users' needs and the life-cycle of these systems, determine their components according to the three tier architecture and summarize the requirements against these parts.

关键词： Enterprise resource planning Companies Software standards Financial management Resource management Information systems Computer architecture Management information systems Information management Collision mitigation

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