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检索条件"机构=Faculty of Automatics and Computer Engineering"

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Design and fabrication of an intelligent irrigation control system

Design and fabrication of an intelligent irrigation control ...

引用

作者： Algeeb, A. Albagul, A. Asseni, A. Khalifa, O. Jomah, O.S. Department of Electrical and Electronic Engineering Academy of Graduate Studies Tripoli Libya Department of Control Engineering Higher Institute of Electronics Baniwalid Libya Department of Electrical and Computer Engineering IIUM Kuala Lumpur Malaysia Faculty of Electrical Engineering Automatics Computer Science and Electronics AGH University of Science and Technology Poland

ISBN: (纸本)9789604742486

This paper describes the design and fabrication of an intelligent Irrigation control system that allows intelligent control of the water applied to the field at right amounts and times. The system should have the capabilities to measure the water content in the soil so water can be applied as needed. The WATERMARK soil moisture sensor based on the measurement of the soil tension will provide the measurement of the water content. The system measures the soil tension, soil temperature and rain status and records the data in a file for future reference. It will apply water to field if a certain level of soil water tension is reached. This intelligent Irrigation control system is suitable for universities, research centers and farms where a control of the soil water content is required. The system can be used to study the water requirements for crops so irrigation can be scheduled efficiently.

关键词： Fabrication

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NMOS current mirror thermal analysis

NMOS current mirror thermal analysis

引用

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

作者： Michal Jablonski Andrzej Kos Gilbert De Mey Faculty of Electrical Engineering Automatics Computer Science and Electronics AGH University of Science and Technology Krakow Poland Faculty of Engineering Gent University Ghent Belgium

This report focuses on the problem of temperature influence on one of the most basic analog circuitry subsystem- a current mirror, based on MOSFET transistors. Basic and cascode current mirrors are put to a simulation test using a SPICE model. The influence of different temperature distributions on output current precision and output resistance are investigated.

关键词： Mirrors Transistors Heating Resistance Temperature distribution Integrated circuits

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Modeling and bi-criterial optimization of a Line Start Permanent Magnet Synchronous Machine to find an IE4 class high-efficiency motor

Modeling and bi-criterial optimization of a Line Start Perma...

引用

International Conference on Electrical Machines, ICEM

作者： W. Jazdzynski M. Bajek Department of Electrical Machines AGH University of Science and Technology Cracow Poland Faculty of Electrical Engineering Automatics Computer Science and Electronics AGH University of Science and Technology Cracow Poland

A high-efficiency Line Start Permanent Magnet Synchronous Machine (LSPMSM) is designed in the paper to meet efficiency requirements, which can be expected for motors of a class IE4 in a new standard classification. A magnetically linear analytical model of the LSPMSM has been developed, and investigated, to be a main part of a synthesis program. The task to find a best design solution has been defined as a bi-criterial optimization problem, with criterial functions representing the interest of both the producer and end user. Calculation results were validated by means of a magnetically non-linear FEM model, before and after the optimization. A high level of conformity has been attained. Results for all efficiency classes, IE1 - IE4, have been presented. A proposed Class IE4 motor offers particularly high savings of total electrical energy. All obtained designs satisfy requirements arising from the geometry, physics, and manufacturing process.

关键词： Induction motors Synchronous motors Analytical models Permanent magnet motors Stators Finite element methods Torque

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Ti02-based nanopowders and thin films for photocatalytical applications

Ti02-based nanopowders and thin films for photocatalytical a...

引用

作者： Radecka, M. Rekas, M. Kusior, E. Zakrzewska, K. Heel, A. Michalow, K.A. Graule, T. Faculty of Materials Science and Ceramics AGH University of Science and Technology al. Mickiewicza 30 30-059 Cracow Poland Faculty of Electrical Engineering Automatics Computer Science and Electronics AGH University of Science and Technology al. Mickiewicza 30 30-059 Cracow Poland EMPA Swiss Federal Laboratories for Materials Testing and Research Laboratory for High Performance Ceramics Überlandstrasse 129 8600 Dübendorf Switzerland

Ti02-based nanopowders are elaborated by flame spray synthesis, FSS from organic precursors of titanium and chromium with the Cr content changing from 0 to 15 at.%. Well-crystallized nanopowders with high specific surface area SSA reaching 107 m2/g for undoped Ti02 and 177 m2/g for Ti02 + 15 at.% Cr are obtained. Thin films are deposited by rf reactive sputtering from metallic Ti and Ti-Cr targets in Ar+02 flow controlled atmosphere. The adjustable area of Cr/Ti allows to obtain up to 16 at.% Cnn Ti02 thin films. X×-ray diffraction, transmission electron spectroscopy, TEM, atomic force microscopy, AFM and optical spectrophotometry over the ultraviolet UV and visible VIS range of the light spectrum have been performed in order to characterize the nanomaterials. The particle size of nanopowders is within the range of 5-42 nm. Anatase is the predominating polymorphic form while the amount of rutile increases with Cr content to reach of about 25 wt.% at 15 at.% Cr. The post-deposition annealing of thin films in air at temperatures from 770 K to 1280 K modifies the phase composition, leads to irreversible transformation from anatase to rutile and affects the surface roughness. Structural and optical properties of Ti02-based nanopowders and thin films are compared. The effctmrect of grain size and the level of chromium doping on the band gap Eg is discussed. Photocatalytic activity of the nanopowders is tested for degradation of methylene blue, MB. Copyright © 2010 American Scientific Publishers All rights reserved.

关键词： Thin films

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Energy storage system

引用

作者： Siostrzonek, Tomasz Piróg, Stanislaw AGH University of Science and Technology Faculty of Electrical Engineering Automatics Computer Science and Electronics Department of Electrical Drive and Industrial Equipment Krakow Poland

In this article the storage systems: capacitors, batteries and flywheel energy storage are described. The flywheel energy storage will be described precisely and compared with other energy storage technologies. ©... 详细信息

ISBN: (纸本)3908451655

关键词： Supercapacitor

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Networking solutions: MPLS and VPNs

Networking solutions: MPLS and VPNs

引用

作者： Lupu, Teodor-Grigore Department of Computer and Software Engineering University Politehnica of Timisoara Faculty of Automatics and Computers Vasile Parvan 2 300223 Timisoara Romania

ISBN: (纸本)9789604741144

The paper is oriented toward systems, network, and security administrators with some degree networking experience who are looking to expand their knowledge of networking solutions as a mean of informing their approach to Virtual Private Networks (VPNs), Multi Protocol Label Switching (MPLS) and MPLS VPNs. This orientation makes for a fairly broad audience and is reflected in the breadth of the material presented.

关键词： Virtual private networks

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Main types of attacks in wireless sensor networks

Main types of attacks in wireless sensor networks

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作者： Lupu, Teodor-Grigore Department of Computer and Software Engineering University Politehnica of Timisoara Faculty of Automatics and Computers Vasile Parvan 2 300223 Timisoara Romania

ISBN: (纸本)9789604741144

Security has become the forefront of network management and implementation. The challenge in the security issue is to find a well balanced situation between two of the most important requirements: the need of developing networks in order to sustain the evolving business opportunities and work level, and the need to protect classified, private and in some cases even strategic information. The application of an effective security policy is the most important step that an institution can take to protect its network. Networks have grown in both size and importance in a very short period of time. If the security is compromised, there could be serious consequences starting from theft of information, loss of privacy and reaching even bankruptcy of that institution. The types of potential threats to network are continuously evolving and must be at least theoretical known in order to fight them back, as the rise of wireless networks implies that the security solution become seamlessly integrated, more flexible.

关键词： Wireless sensor networks

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Towards developing secure video surveillance systems over IP

Towards developing secure video surveillance systems over IP

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2009 4th International Conference on Internet Monitoring and Protection, ICIMP 2009

作者： Groza, Bogdan Silea, Ioan Pop, Dragos Patriciu, Victor-Valeriu Politehnica University of Timisoara Faculty of Automatics and Computers Timisoara Romania Continental Corporation Infotainment and Interpersonal Department Timisoara Romania Military Technical Academy Department of Computer Engineering Bucharest Romania

ISBN: (纸本)9780769536125

A framework of three attributes for video surveillance systems is underlined: availability, accessibility and authenticity. Under this framework, a scenario in which surveillance cameras can be accessed by remote devices, such as mobile phones, PDAs, over IP is addressed. Some security drawbacks of an off-the-shelf product are depicted and a new solution is proposed which uses cryptographic authentication for the broadcasted images. The proposed application is implemented in Java and can run on any device from standard computers to mobile phones. Also, some experimental results are presented for the case when a mobile phone is used as a receiver, this case being relevant as the device is the potential receiver with the most constrained computational resources. © 2009 IEEE.

关键词： Cellular telephones

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Modeling a spatial communication activity in wireless sensors network

Modeling a spatial communication activity in wireless sensor...

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8th International Workshop on Modeling and Applied Simulation, MAS 2009, Held at the International Mediterranean and Latin American Modeling Multiconference, I3M 2009

作者： Nikodem, Jan Klempous, Ryszard Nikodem, Maciej Woda, Marek Chaczko, Zenon Institute of Technical Cybernetics Wroclaw University of Technology Poland Institute of Computer Engineering Automatics and Robotics Wroclaw University of Technology Poland Institute of Computer Science Control and Robotics Faculty of Electronics Wroclaw University of Technology Poland University of Technology Sydney NSW Australia

ISBN: (纸本)9781629934747

This paper presents a novel method of modeling spatial communication activity in wireless sensor network (WSN). We define native aspects of communication in WSN. Focusing on local/global activity dilemma, cooperation, interference, network topology, and optimization aspects. A neighborhood abstraction is defined and we involve three binary relations: subordination, tolerance and collision to describe the cooperation in WSN. Using digital terrain model tools we model communication activity aspects as surfaces, stretched over WSN network. A network topology features are modeled using bare drainage surface. It is a component of a topographic map, which gives a direction towards the base station, determined by a slope of the modeled surface. Modeling node's instant energy level, we construct another surface represents node's instant level of consumed energy. Finally, we construct a drainage surface spread over each node neighborhood as superposition of bare drainage surface, energy consumed and relational surfaces.

关键词： Topology

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Design and measurements of 64-channel ASIC for neural signal recording

Design and measurements of 64-channel ASIC for neural signal...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： P. Kmon M. Zoladz P. Grybos R. Szczygiel Department of Measurement and Instrumentation Faculty of Electrical Engineering Automatics Computer Science and Electronics AGH University of Science and Technology Cracow Poland

This paper presents the design and measurements of a low noise multi-channel front-end electronics for recording extra-cellular neuronal signals using microelectrode arrays. The integrated circuit contains 64 readout channels and was fabricated in CMOS 0.18 mum technology. A single readout channel is built of an AC coupling circuit at the input, a low noise preamplifier, a band-pass filter and a second amplifier. In order to reduce the number of output lines, the 64 analog signals from readout channels are multiplexed to a single output by an analog multiplexer. The chip is optimized for low noise and matching performance with the possibility of cut-off frequencies tuning. The low cut-off frequency can be tuned in the 1 Hz - 60 Hz range and the high cut-off frequency can be tuned in the 3.5 kHz -15 kHz range. For the nominal gain setting at 44 dB and power dissipation per single channel of 220 muW the equivalent input noise is in the range from 6 muV - 11 muV rms depending on the band-pass filter settings. The chip has good uniformity concerning the spread of its electrical parameters from channel to channel. The spread of gain calculated as standard deviation to mean value is about 4.4% and the spread of the low cut-off frequency is on the same level. The chip occupies 5times2.3 mm 2 of silicon area.

关键词： Signal design Application specific integrated circuits Cutoff frequency Integrated circuit measurements Integrated circuit noise CMOS technology Band pass filters Noise measurement Microelectrodes CMOS integrated circuits

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