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Optimized packet size for energy efficient delay-tolerant sensor networks

Optimized packet size for energy efficient delay-tolerant se...

引用

IEEE International Conference on Wireless and Mobile Computing, Networking And Communications (WiMob)

作者： Károly Lendvai Ákos Milánkovich Sándor Imre Sándor Szabó Department of Telecommunications Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

In wireless smart metering optimization for energy efficiency is indispensable, because in case of systems without external power supply, battery life is a key factor regarding the usability of the whole system. Sensor networks are less sensitive for delay, this is why aggregation of packets is possible. The aim of this paper is to determine analytically the amount of meter records to aggregate in one packet, regarding the SNR which characterizes the quality of the channel, so that the energy usage is optimal. The introduced formulas, help determining scheduling parameters in wireless smart metering systems. The calculations are presented on a real world scenario and system using GFSK modulation.

关键词： Signal to noise ratio Energy efficiency Bit error rate Modulation Microcontrollers Protocols Encoding

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Off-Line Signature Verification Based on Feature Matching

Off-Line Signature Verification Based on Feature Matching

引用

IEEE International Conference on Intelligent Engineering Systems (INES)

作者： Bence Kovari Zsolt Kertesz Attila Major Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Hungary Department of Control Engineering and Information Technology Budapest University슠of슠Technology슠and슠Economics Hungary

This paper presents a novel approach for off-line signature verification. First the different aspects and problems of signature verification are discussed in conjunction with off-line analysis methods. It is shown, that on-line analysis methods perform usually better than off-line methods because they can make use of the temporal information (and thereby get a better perception of the semantics of the signature). An assumption is made, that off-line verification methods have difficulties improving their results because of the high level of abstraction they use, which is a direct consequence of the missing semantics. Afterwards a solution is presented with the ability to preserve some semantic information, and thereby deliver a better ability to analyze the results and optimize the system.

关键词： Handwriting recognition Data acquisition Feature extraction Information analysis Automation Informatics Control engineering Information technology Error analysis Law

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Life-time test of laser and reflow soldered flexible substrates

Life-time test of laser and reflow soldered flexible substra...

引用

International Spring Seminar on Electronics technology

作者： Reka Batorfi Zsolt Illyefalvi-Vitez Department of Electronics Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

We examined the quality and the reliability of lead-free solder joints which were made with a selective laser soldering process. The three types of applied substrate materials - polyimide (PI), a kind of polyester (PET) and polyethylene-naphtalate (PEN) - withstood the local heat dose even if the allowed temperature limits of them were lower than the melting points of the applied solders. We used substrates with different adhesives and cover layers. The two types of solder pastes were SnBi and SnAgCu (SAC) alloys. Altogether 16 solder-substrate-adhesive combinations were tested and compared to similar reflow soldered combinations when the implementation of the technology was possible. The testboards were submitted to HAST (highly accelerated stress test) and the degradation was monitored. Optical inspection and shear force measurements were used for comparative analyses. As a result, the combinations were put in order on the basis of these data. With these achievements; the processing, materials, product performance and reliability could be improved.

关键词： Life testing Soldering Optical materials Environmentally friendly manufacturing techniques Lead Polyimides Positron emission tomography Temperature Life estimation Stress

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Cost Effective Design for Six Sigma in Component Placement

Cost Effective Design for Six Sigma in Component Placement

引用

International Spring Seminar on Electronics technology

作者： Mihaly Janoczki Balazs Illes Department of Electronics Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

The size decreison of passive components nowadays reaches 01005 dimension. For larger components also, but for these tiny components the accuracy of the component placement machines is a very important variable in respect of the placement quality. There are other variables that affect the placement quality (the quality of the solder paste, or the adhesive etc.), but I only studied the methods, that could improve the accuracy of the placement machines. It was a very important aspect that I use the method that is suggested in the standard: IPC-9850, but not to use expensive, special optical CMM (Calibrated Measuring Machine), and not to use expensive tester components (QFP, R, C, etc.) either.

关键词： Costs Six sigma Production Process control Reactive power Statistics Inspection Surface-mount technology Gaussian processes Power generation economics

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Investigation of tin whisker growth: The effects of Ni and Ag underplates

Investigation of tin whisker growth: The effects of Ni and A...

引用

International Spring Seminar on Electronics technology

作者： Barbara Horvath Balazs Illes Gabor Harsanyi Department of Electronics Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

A major problem with tin electroplating is the formation of tin whiskers. These are spontaneous protrusions of few microns in diameter and up to hundreds of microns or even millimeters in length. There are several mitigation strategies and using a nickel or silver underplate is proven to be excellent in preventing the forming of Cu 6 Sn 5 intermetallics. Still there are not many scientific researches about the effects of this mitigation strategy. Therefore we have tested leadframe samples in different temperature and humidity conditions (105degC/100% relative humidity (RH), 50degC/25% RH) for over 3400 hours. Both leadframes were on bronze substrates and had 1-2 mum underplates (silver or nickel) with 5-7 mum tin on the top. Our results have shown hillock and whisker growth differences on the samples depending on the nature of the different environmental circumstances, which is originated to the different stress-causing mechanisms, and also growth differences have been found on the different underplate materials.

关键词： Tin Thermal stresses Residual stresses Compressive stress Environmentally friendly manufacturing techniques Nickel Substrates Silver Intermetallic Humidity

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Skype Traffic Identification

Skype Traffic Identification

引用

IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference

作者： Marcell Perenyi Andras Gefferth Trang Dinh Dang Sandor Molnar Department of Telecommunications and Media Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

Skype uses strong encryption to secure communications inside the whole Skype network. Clients choose communication ports randomly. Therefore traditional port based or payload based identification of Skype traffic is not feasible. In this paper we introduce a novel flow dynamics based identification method to discover Skype host and voice calls as well. Our method uses only packet headers and the extracted flow level information. The whole identification process is scripted in Transact-SQL, thus it can be executed automatically. We also present the validation of the algorithm together with some analysis of the identification results.

关键词： Telecommunication traffic Payloads Pricing Relays Network servers Economic forecasting Cryptography Tin Informatics Data mining

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Present status of transition to Pb-free soldering

Present status of transition to Pb-free soldering

引用

International Spring Seminar on Electronics technology

作者： Zs. Illyefalvi-Vitez J. Pinkola G. Harsanyi Cs. Dominkovics B. Illes L. Tersztyanszky Department of Electronics Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

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A wide tuning range integrated 4GHz differential VCO for PLL

A wide tuning range integrated 4GHz differential VCO for PLL

引用

International Conference on Microwaves, Radar and Wireless Communications

作者： Tamas Marozsak Budapest University슠of슠Technology슠and슠Economics Hungary

The design of a wide tuning range voltage controlled oscillator (VCO) for integrated phase locked loop (PLL) is presented. The circuit was implemented on a 0.35um bicmos technology. The VCO had 36% tuning range together with good figure of merit. The paper shows the design methodology used to obtain small tuning gain variation in the whole frequency, temperature and process variation range. Some design details are shown together with measurement results.

关键词： Voltage-controlled oscillators Phase locked loops Tuning Frequency Inductors Phase noise Circuit optimization Varactors Radiofrequency integrated circuits Q factor

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Tracking Error Based On-line Trajectory Time Scaling

Tracking Error Based On-line Trajectory Time Scaling

引用

IEEE International Conference on Intelligent Engineering Systems (INES)

作者： E. Szadeczky-Kardoss B. Kiss Department of Control Engineering and Information Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

This paper presents an online time scaling concept for robotic manipulators. The task is to ensure the fastest possible motion along a trajectory with a given geometry in the robot workspace. The other requirement is tracking accuracy. Robots should move not only with high speed but with high precision as well. The speed of the motion cannot be arbitrary fast. It is delimited by the saturation of the actuators and by some other (e.g. security) constraints. Offline time scaling solutions change the speed of the motion without changing its geometry, thus these constraints are not violated. If the exact torque bounds are not known in advance, another method should be used. This work gives an online time scaling algorithm which is based on the tracking error. Simulations demonstrate the usefulness of the algorithm proposed

关键词： Trajectory Robots Actuators Torque Manipulators Tracking Control engineering Information technology Computational geometry Computer errors

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Incompatibility Problems in Soldering technology

Incompatibility Problems in Soldering Technology

引用

International Spring Seminar on Electronics technology

作者： L. Tersztyanszky B. Illes Department of Electronic Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

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