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Flow sensor for microfluidic applications — Based on standard PWB technology

Flow sensor for microfluidic applications — Based on standa...

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International Spring Seminar on Electronics technology

作者： Ferenc Ender Hunor Santha Vladimir Szekely Department of Electronics Technology Budapest University슠of슠Technology슠and슠Economics Hungary Department of Electron Devices Budapest University슠of슠Technology슠and슠Economics Hungary

In this paper the design and implementation of a microfluidic flow sensor constructed on standard PWB (printed wiring board) and PDMS (Polydimethylsiloxane) technology is presented. The measurement principle is based on convective heat transfer. Calculations and computer aided simulations were performed to find optimal working conditions. A pressure-driven measurement system was built to characterize the device. The measurements confirmed that the flow sensor is able to work from 1.6 ml/min up to 10 ml/min range.

关键词： Microfluidics Sensor phenomena and characterization Thermal sensors Temperature sensors Heat transfer Computational modeling Computer simulation Sensor systems Optical sensors Admittance measurement

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Joint Application of Spread Spectrum and OFDM Modulation for Microwave Radio Communication Used for Unmanned Aerial Vehicle

Joint Application of Spread Spectrum and OFDM Modulation for...

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IEEE Conference on Vehicular technology (VTC)

作者： Zoltan Belso Tamas Szilagyi Laszlo Pap Kalman Elek Istvan Koller Budapest University슠of슠Technology슠and슠Economics Hungary

The wireless communication system used by an Unmanned Aerial Vehicle has special requirements. Two separate data streams are used, one for telemetry and control of the vehicle, and one for payload. The first stream is of relatively low data rate, but must be very robust. The second stream requires high data rate, but a best effort approach is acceptable. Real-time remote control usage mandates low response time (turn around latency) of the system, which demands small frames and frequent direction changes over the half duplex channel. These two different requirements must be accounted for in the design of the modulation system. In this paper our solution based on the joint application of a chirp spread spectrum modulation with a correlator based demodulator for the telemetry and control data stream and a high data rate orthogonal frequency division multiplexing (OFDM) modulation for the payload is presented. The OFDM communication occupies the same bandwidth as the spread spectrum modulation, but - unlike the Chirp signal - utilizes its full bandwidth. By using a correlation detector for all timing recovery tasks and keeping the same timing for the OFDM part of the frame, all control loops normally needed for this task (symbol synchronization PLL, COSTAS loop) can be eliminated. This results in the whole signal processing path being a finite impulse response system which aids us in a highly pipelineable design implementation and makes it possible to create a high speed implementation with a low-end field programmable gate array (FPGA) circuit.

关键词： OFDM Receivers Chirp Timing Modulation Field programmable gate arrays Correlation

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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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Fuzzy modelling in energetic

Fuzzy modelling in energetic

引用

Conference of the North American Fuzzy Information Processing Society - NAFIPS

作者： A. Penninger T. Tari S. Konczol L.T. Koczy P. Varlaki Department of Heat Engineering Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Department of Telecommunications and Telematics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Department of Road Vehicles Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Application of fuzzy control in consumer electronics is a daily practice. In energetic there are also promising areas, especially in power industry, air conditioning and heating technology. We attempt to apply fuzzy control technique to small household boilers. A demonstration of this application is presented in this paper. The goal was to keep the outcome temperature of the domestic hot water at a given constant value; meanwhile the temperature of the incoming water was changed. We also examined the effects of the regular and random perturbation in the input mass flow. At last we pointed out some potential possibilities of this development in the increase of the energetic and environmental effectiveness. In the first step, the control algorithm is based on the well-known classic Mamdani approach, because in this system the number of variables is small. However, in further prospective systems we integrate several components and our intention is to use various complexity reduction approaches especially fuzzy rule interpolation techniques. At these complex systems the hierarchical interpolative fuzzy control are reasonable and applicable.

关键词： Fuzzy control Temperature Consumer electronics Power industry Air conditioning Heating Boilers Control systems Fuzzy systems Interpolation

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Why Traffic Engineering does not work for physical impairments based routing

Why Traffic Engineering does not work for physical impairmen...

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European Conference on Optical Communication (ECOC)

作者： Peter Soproni Tibor Cinkler Budapest University슠of슠Technology슠and슠Economics Hungary

In all optical routing the main question is the permissible distance. Signal power is a key resource. The most common idea of resource balancing is traffic engineering. We will show with examples and simulations why T... 详细信息

关键词： Routing Quality of service Optical fiber networks Power engineering and energy Telecommunication traffic Stimulated emission Communication system traffic control Paper technology Power generation economics Traffic control

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Scoliosis testing features on the basis of electronically generated moire patterns

Scoliosis testing features on the basis of electronically ge...

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International Symposium on Applied Machine Intelligence and Informatics (SAMI)

作者： Zselyke Gaál Ákos Antal Péter Tamás Economics Budapest University슠of슠Technology슠and슠Economics Hungary

The Dept. of Mechatronics, Optics and Information Engineering, within the project team, had built an electronic moire equipment primarily visualising and diagnosing of scoliosis. The device generates a computerized moire phenomenon, which can be viewed by an appropriate display. The applicability of the system was tested from statistical point of view based on moire patterns created by the prototype device particularly the characteristics of the scoliosis.

关键词： Electronic equipment testing Test pattern generators Orthopedic surgery Pressure measurement Prototypes Surface topography Informatics Mechatronics Computer displays Appropriate technology

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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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The effect of lead free soldering on formation of black pad failure

The effect of lead free soldering on formation of black pad ...

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International Spring Seminar on Electronics technology

作者： O. Krammer Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

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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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Digital Non-Subtractive Dither: Necessary and Sufficient Condition for Unbiasedness, with Implementation Issues

Digital Non-Subtractive Dither: Necessary and Sufficient Con...

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IEEE Instrumentation and Measurement technology Conference

作者： I. Kollar Department of Measurement and Information Systems Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Dither theory gives the condition of unbiasedness for non-subtractive dither, which can only be fulfilled with continuous-amplitude dithers. However, within a computer or a DSP, only digital dither can be used. A condition was given for digital dither, however, the condition and the proof was only approximate. This paper makes the statement precise, and gives a full proof for unbiasedness. Implementation issues are also discussed

关键词： Sufficient conditions Quantization Digital signal processing Instrumentation and measurement Information systems Roundoff errors Random variables Input variables Probability density function Digital signal processors

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