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A novel 180° microstrip phase shifter based on cascaded branch-line couplers for direct QPSK modulation

A novel 180° microstrip phase shifter based on cascaded bra...

引用

Asia-Pacific Conference on Microwave

作者： Narit Youngthanisara Ravipat Phudpong Teera Rergmaneewan Phaiboon Booppha Department of Electronic and Telecommunication Faculty of Engineering Kasem Bundit University Bangkok Thailand National Electronics and Computer Technology Center Pathum Thani Thailand

This paper presents a design and construction of a microstrip QPSK modulator using a novel 180° phase shifter. This phase shifter consists of two cascaded branch-line couplers, thus having two input ports. By feeding an RF carrier to different input ports controlled by digital bits, 0 and 1, the phase of the RF carrier is shifted by 180°. The microstrip prototype of this modulator yields a good result. The insertion loss is lower than 11.7 dB. The phase and magnitude error is lower than ±0.4° and ±1.49% respectively. The image ratio is lower than -31 dBc and the carrier leakage ratio is lower than -21 dBc. The prototype was fabricated onto a hydrocarbon ceramic, RO4350B, with the dimension of 8.6×7.8 cm.

关键词： Phase shift keying Phase shifters Radio frequency Couplers Insertion loss

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Using intrinsic surface geometry and absolute invariants for 3D face alignment and registration

Using intrinsic surface geometry and absolute invariants for...

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International Conference on Intelligent Systems Design and Applications (ISDA)

作者： Chuchart Pintavirooj Prasong Tosranon Fernand S. Cohen Department of Electronics Faculty of Engineering King Mongkut''s Institute of Technology Ladkrabang Bangkok Thailand Department of Electrical and Computer Engineering Drexel University Philadelphia PA USA

In this paper we derive novel surface fiducial points that are computed from the differential geometry of the surface. The fiducial intrinsic points are intrinsic, local, and relative invariants, i.e., they are preserved under similarity, affine, and nonlinear transformations that are piecewise affine. As the fiducial points are computed from high order surface shape derivatives, their sensitivity to any noise either due to measurement error or local distortion is high. To reduce these effects, we use a B-Spline curve/surface representation that smoothes out the curve/surface prior to the computation of these intrinsic invariant points. The fiducial points are used in a non-iterative geometric-based method for 3D shape matching and registration of human faces. The matching is achieved by establishing correspondences between fiducial points after a sorting based on a set of absolute local affine invariants derived from them. The performance of the matching based on these fiducial points although shown for face alignment, the overall approach is generic to the alignment a variety of objects for which these intrinsic fiducial points exist and for scenarios where the classes of nonlinear transformations are piecewise affine.

关键词： Face Three dimensional displays Surface treatment Shape Spline Noise Intelligent systems

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Towards a brain controlled assistive technology for powered mobility

Towards a brain controlled assistive technology for powered ...

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

作者： Kelly Kaneswaran Khalil Arshak Edward Burke James Condron University of Limerick Ireland Microelectronics in the Electronics and Computer Engineering ECE Department Faculty of Science and Engineering University of Limerick Ireland School of Electronic Engineering Systems Dublin Institute of Technology UK

For individuals with mobility limitations, powered wheelchair systems provide improved functionality, increased access to healthcare, education and social activities. Input devices such as joystick and switches can provide the necessary input required for efficient control of the powered wheelchair. For persons with limited dexterity, or fine control of the fingers, access to mechanical hardware such as buttons and joysticks can be quite difficult and sometimes painful. For individuals with conditions such as Traumatic Brain Injury (TBI), Multiple Sclerosis (MS) or Amyotrophic lateral sclerosis (ALS) voluntary control of limb movement maybe substantially limited or completely absent. Brain computer Interfaces (BCI) are emerging as a possible method to replace the brains normal output pathways of peripheral nerves and muscles, allowing individuals with paralysis a method of communication and computer control. This study involves the analysis of non-invasive electroencephalograms (EEG) arising from the use of a newly developed Human Machine Interface (HMI) for powered wheelchair control. Using a delayed response task, binary classification of left and right movement intentions were classified with a best classification rate of 81.63% from single trial EEG. Results suggest that this method may be used to enhance control of HMI's for individuals with severe mobility limitations.

关键词： Wheelchairs Electroencephalography Fingers Feature extraction Brain computer interfaces Humans Visualization

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Intellectual property (IP) cores and a logic fault test simulation environment

Intellectual property (IP) cores and a logic fault test simu...

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29th IASTED International Conference on Modelling, Identification and Control, MIC 2010

作者： Assaf, Mansour H. Moore, Leslie -A. Das, Sunil R. Biswas, Satyendra N. Applegate, Alexander R. Petriu, Emil M. Department of Information Communications Technology University of Trinidad and Tobago Arima 7498 Trinidad and Tobago School of Information Technology and Engineering Faculty of Engineering University of Ottawa Ottawa ON K1N 6N5 Canada Department of Computer and Information Science College of Arts and Sciences Troy University Montgomery AL 36103 United States Department of Electronics Engineering Norfolk State University Norfolk VA 23504 United States

The subject paper develops a low-level logic fault test simulation environment for embedded systems targeted specifically towards application-specific integrated circuits (ASICs) and intellectual property (IP) cores. The simulation architecture emulates a typical built-in self-testing (BIST) environment with automatic test pattern generator (ATPG) that sends its outputs to a circuit (core) under test (CUT) and the output streams from the CUT are fed into an output response analyzer (ORA). The paper describes in detail the test architecture environment, test application and fault injection including the application of the logic fault simulator. Results on simulation on some specific IP cores designed using combinations from ISCAS 85 combinational and ISCAS 89 sequential benchmark circuits are provided as well for appraisal.

关键词： Built-in self test

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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...

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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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Analysis of signal propagation in 1-D CNNs with the antisymmetric template

Analysis of signal propagation in 1-D CNNs with the antisymm...

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IEEE International Workshop on Cellular Nanoscale Networks and their Applications, (CNNA)

作者： Norikazu Takahashi Tetsuo Nishi Hajime Hara Department of Informatics Kyushu University Fukuoka Japan Faculty of Science and Engineering Waseda University Tokyo Japan Department of Electronics and Computer Engineering Hiroshima Institute of Technology Hiroshima Japan

ISBN: (纸本)9781424466795;9781424466788

This paper studies some fundamental properties on signal propagation in one-dimensional cellular neural networks with the antisymmetric template under the assumption that the initial output has only one connected component. A new sufficient condition for the component to propagate without attenuation is derived through theoretical analysis. It is also proved that under the same condition the final output is a black-and-white image having only one black at the right-most pixel, which means that the network can perform connected component detection when the input image has only one connected component.

关键词： Signal analysis Cellular neural networks Pixel Charge coupled devices Sufficient conditions Application software Attenuation Cellular networks Informatics computer networks

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Ti02-based nanopowders and thin films for photocatalytical applications

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

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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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Long digital straight segments for fingerprint matching

Long digital straight segments for fingerprint matching

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International Conference on Machine Learning and Cybernetics (ICMLC)

作者： Xiubao Jiang Long Zhou Mingming Gong Xinge You Department of Electronics and Information Engineering Wuhan Polytechnic University Wuhan China Faculty of Mathematics and Computer Science Hubei University Wuhan China Department of Electronics and Information Engineering Huazhong University of Science and Technology Wuhan China

In this paper, we proposed a new feature extraction method for fingerprint matching. We find that long digital straight segments (LDSSs) in fingerprints can accurately characterize the global structure of fingerprints. Besides, the orientation information of these segments is more stable compared to orientation fields. It is a useful information for representing the fingerprints. In addition, each digital straight segment can be represented by four parameters: x-coordinate, y-coordinate, slope and length. It only needs about 600 bytes to store all the parameters of LDSSs of a fingerprint, which is much less than the storage orientation field needs. Finally, the LDSSs can automatically capture the maximum structural information of local regions. Consequently, LDSSs are more convenient to combine with the minutiae based methods than orientation fields. The experiments conducted on fingerprint database FVC2002 DB3a and DB4a show that our method is effective.

关键词： Bifurcation Fingers Fingerprint recognition

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Design and simulation of flow cell chamber for quartz crystal microbalance sensor array

Design and simulation of flow cell chamber for quartz crysta...

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International Conference on Electrical engineering/electronics, computer, Telecommunications and Information technology, ECTI-CON

作者： Kata Jaruwongrungsee Thitima Maturos Pornpimol Sritongkum Anurat Wisitsora-at Chuchart Pintavirooj Manas Sangworasil Adisorn Tuantranont Department of Electrical Engineering Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang (KMITL) Ladkrabang Thailand Nanoelectronics and MEMS Laboratory National Electronics and Computer Technology Center Pathum Thani Thailand Department of Telecommunications Engineering Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang (KMITL) Ladkrabang Thailand

ISBN: (纸本)9781424456062;9789746724913

In this paper, the cause of significant variation in sensing responses of identical QCM sensors array in a circular QCM chamber is analyzed by fluid dynamic simulation. Moreover, the simulation is used to determine an appropriate shape of flow chamber for QCM sensor array. Simulation results show that the flow in a circular-shaped QCM chamber design is primarily turbulent. In addition, the degree of turbulence is increased with flow rate. Thus, sensors at various locations see different sample dispersions causing their sensing behaviors to be significantly different. The QCM chamber has been redesigned to be rectangular line and simulation results indicate that it can be the solution to the problem because flow in the new design is primarily laminar with uniform sample velocity.

关键词： Sensor arrays Biosensors Electrodes Frequency Sensor phenomena and characterization Sputtering Gold Chemical and biological sensors Temperature sensors Chromium

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Effect of Substrate Position on the Formation of ZnO Nanostructures Synthesized by Thermal Evaporation of ZnO-CNTs Mixture

Effect of Substrate Position on the Formation of ZnO Nanostr...

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electronics, computer, Telecommunications and Information technology International Conference on Electrical engineering/electronics, computer, Telecommunications and Information technology

作者： S. Pitayapiboonpong S. Kanjanachuchai D. Phokharatkul A. Tuantranont A. Wisitsoraat Semiconductor Device Research Laboratory (Nanotec Center of Excellence) Department of Electrical Engineering Faculty of Engineering Chulalongkorn University Nanoelectronics and MEMS Laboratory National Electronics and Computer Technology Center (NECTEC)

ISBN: (纸本)9781424456062

In this work, the effect of substrate position on the formation of ZnO nanostructures synthesized by thermal evaporation of zinc oxide (ZnO) and carbon nanotubes (CNTs) on silicon substrate is investigated. The multi-wall CNT powder made by chemical vapor deposition was mixed with ZnO powder with a molar ratio of 1:1. The source material was put into the middle of chamber while Si substrates were placed at various locations from the center to the end of the tube furnace. The evaporation took place at 950℃ and 2 Torr under argon gas flow rate of 500 seem and the system was vented at this temperature at the end of process. Structural characterization by scanning electron microscopy showed that ZnO tetrapod-like structures are formed in samples at different positions but they have different densities, sizes and morphologies. The density and size of ZnO nanotetrapods are found to decrease as the distance from source powder increases and substrate temperature decreases. In addition, considerable carbon content and high crystallinity of wurtzite ZnO nanostructure were observed by energy dispersive X-ray spectrometry and X-ray diffraction. Moreover, ZnO nanostructures have a wide blue-green luminescent band between 380 and 600 nm.

关键词： Zinc oxide Nanostructures Powders Temperature Carbon nanotubes Silicon Chemical vapor deposition Nanostructured materials Furnaces Argon

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