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A Highly Reliable Converter for Wind Power Generation Application

A Highly Reliable Converter for Wind Power Generation Applic...

引用

Annual IEEE Applied Power Electronics Conference and Exposition

作者： Mahshid Amirabadi Hamid A. Toliyat Advanced Electric Machines and Power Electronics (EMPE) Lab. Electrical and Computer Engineering Department Texas A&M University College Station TX 77843-3128

ISBN: (纸本)9781467343541

This paper proposes a novel soft switching ac link converter for wind power generation. In this converter, the link is formed by a low reactive rating series inductor/capacitor (LC) pair having alternating current and voltage. Therefore, the proposed converter does not include any dc capacitors or chokes, resulting in a very compact design and reliable performance. The proposed converter is a partial resonant converter i.e. only a small time interval is allocated to resonance in each cycle. Hence, while the resonance facilitates zero current turn-off of the switches, the LC link has low reactive ratings and low power dissipation. Due to the zero current turn off of the switches, the switching frequency can be as high as permitted by the switches. The high frequency of the link minimizes the size of the passive components. Switches used in this converter can be of any type;even SCRs can be used. In order to provide galvanic isolation a single phase high frequency transformer can be added to the link. Light weight and compactness, along with high efficiency and long lifetime, make the proposed converter, which is named Series Partial Resonant Converter (SEPARC), an excellent candidate for different applications, especially wind power generation systems. In this paper, the performance of the proposed converter is evaluated for wind power generation applications.

关键词： LC SEPARC Application

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A New Generation of Buck-Boost Resonant AC-Link DC-DC Converters

A New Generation of Buck-Boost Resonant AC-Link DC-DC Conver...

引用

Annual IEEE Applied Power Electronics Conference and Exposition

作者： Hamidreza Keyhani Hamid A. Toliyat Advanced Electrical Machines & Power Electronics (EMPE) Lab. Department of Electrical & Computer Engineering Texas A&M University College Station TX 77843-3128

ISBN: (纸本)9781467343541

This paper introduces soft-switched high-frequency ac-link dc-dc converters. An ac inductor and a small ac capacitor form the parallel high-frequency ac link. The link inductor is the main element for transferring power, and the link capacitor creates partial resonances to obtain zero-voltage turn-on and turn-off for the converter's switches. Both link inductor and capacitor handle ac voltages and currents with low reactive ratings, so they are considerably small and efficient. Moreover, the converters have the ability to make the step-up and step-down operations by using two reverse-blocking switches for unidirectional power flow and two bidirectional switches for bidirectional operation. The converters' link frequency varies slightly by changing the input voltage and load current. The basic operation of the resonant converters includes four modes, which are described in detail. The comprehensive analysis of the proposed topologies is carried out as well. Various simulation and experimental results are provided to verify the performance of the proposed power converters.

关键词： Generation DC-DC Converters

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Contribution of non-scrambled chroma information in privacy-protected face images to privacy leakage

Contribution of non-scrambled chroma information in privacy-...

引用

10th International Workshop on Digital-Forensics and Watermarking, IWDW 2011

作者： Sohn, Hosik Lee, Dohyoung De Neve, Wesley Plataniotis, Konstantinos N. Ro, Yong Man Image and Video Systems Lab. Department of Electrical Engineering Korea Advanced Institute of Science and Technology Korea Republic of Multimedia Lab. Department of Electrical and Computer Engineering University of Toronto Canada

ISBN: (纸本)9783642322044

To mitigate privacy concerns, scrambling can be used to conceal face regions present in surveillance video content. Given that lightweight scrambling tools may not protect chroma information in order to limit bit rate overhead in heterogeneous usage environments, this paper investigates how the presence of non-scrambled chroma information in face regions influences the effectiveness of automatic and human face recognition (FR). To that end, we apply three automatic FR techniques to face images that have been privacy-protected by means of a layered scrambling technique developed for Motion JPEG XR, testing the effectiveness of automatic FR and layered scrambling using various experimental conditions. In addition, we investigate whether agreement exists between the judgments of 32 human observers and the output of automatic FR. Our experimental results demonstrate that human observers are not able to successfully recognize face images when simultaneously visualizing scrambled luma and non-scrambled chroma information. However, when an adversary has access to the coded bit stream structure, the presence of non-scrambled chroma information may significantly contribute to privacy leakage. By additionally applying layered scrambling to chroma information, our experimental results show that the amount of privacy leakage can be substantially decreased at the cost of an increase in bit rate overhead, and with the increase in bit rate overhead dependent on the number of scalability layers used. © 2012 Springer-Verlag.

关键词： Scalability

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Propagation of spatial soliton in a parity-time symmetric index profile

Propagation of spatial soliton in a parity-time symmetric in...

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20th Iranian Conference on Electrical engineering, ICEE 2012

作者： Nazari, Mina Nazari, Fakhroddin Moravvej-Farshi, Mohammad Kazem Faculty of Electrical and Computer Engineering Advanced Devices Simulation Lab. TarbiatModares University P. O. Box 14115-194 Tehran *** Iran

ISBN: (纸本)9781467311489

We report the behavior of special soliton propagating along the axis of a parity time symmetric (PTS) waveguide, whose real part is a secant-hyperbolic profile. Numerical results show that the swing behavior depends on the amplitude of soliton, its initial input position, and the maximum amplitude of the imaginary part of the PTS profile. © 2012 IEEE.

关键词： Solitons

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Impact of out-of-band interferers on MB-OFDM UWB transmission in radio over fiber systems

Impact of out-of-band interferers on MB-OFDM UWB transmissio...

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Optical Fiber Communication Conference, OFC 2012

作者： Hraimel, Bouchaib Zhang, Xiupu Ma, Luo Advanced photonic systems Lab Department of Electrical and Computer Engineering Concordia University Montreal QC H3G 1M8 Canada

ISBN: (纸本)9781557529381

We experimentally investigate the impact of out of band interferers on the performance of multiband OFDM UWB signal transmission in RoF systems. An acceptable EVM and ACPR of -17 dB and -20 dB can be achieved even after shifting by 30% from the optimum quadrature bias. Further improvement of EVM and ACPR can be achieved by using mixed polarization technique even under strong interference level when the bias is shifted near minimum transmission. © 2012 OSA.

关键词： Radio-over-fiber

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Radio-Frequency properties of Teflon Amorphous Fluoropolymer deposited on gold CPW transmission lines

Radio-Frequency properties of Teflon Amorphous Fluoropolymer...

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2012 IEEE 13th Annual Wireless and Microwave Technology Conference, WAMICON 2012

作者： Alstad, Jordan Franklin, Rhonda Renn, Michael Bourassa, Justin Electrical and Computer Engineering University of Minnesota Twin Cities Minneapolis MN United States Advanced Applications Lab. Optomec Inc. St. Paul MN United States

ISBN: (纸本)9781467301299

Advancements in Radio-Frequency (RF) technology are being used in interdisciplinary fields like biotechnology and biomedicine. Materials are needed that can serve multiple purposes. RF signals are being used to study biological systems, such as cells and bacteria, using integrated circuit fabrication techniques. These methods, however, are not always compatible with biological environments. This paper investigates the RF properties of Dupont Teflon Amorphous Fluoropolymer (Teflon AF) as masking film on gold coplanar waveguide (CPW) structures. The physical properties and the deposition method are discussed and data (45 MHz-50 GHz) on the reflection, transmission and effective permittivity is presented. Insertion loss change is less than 2% between coated and uncoated structures. © 2012 IEEE.

关键词： Polytetrafluoroethylenes

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A practical local hacking scheme on device-independent bell test based quantum randomness expansion

A practical local hacking scheme on device-independent bell ...

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Frontiers in Optics, FIO 2012

作者： Li, Junhui Yu, Quanfu Liu, Yu Guo, Hong CREAM Group State Key Lab. of Advanced Optical Communication Systems and Networks Inst. of Quantum Electronics School of Electronics Engineering and Computer Science Peking University Beijing 100871 China

Violation of Bell inequality cannot guarantee non-locality, thus an applicable hacking scheme on device-independent Bell test based quantum randomness expansion is given, together with a more secure upper bound on gen... 详细信息

ISBN: (纸本)9781557529565

关键词： Personal computing

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Visuohaptic discrimination of 3D gross shape

Visuohaptic discrimination of 3D gross shape

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作者： Kim, Kwangtaek Barni, Mauro Prattichizzo, Domenico Tan, Hong Z. Haptic Interface Research Lab. School of Electrical and Computer Engineering Purdue University West Lafayette IN United States Department of Information Engineering University of Siena Siena Italy Department of Advanced Robotics Istituto Italiano di Technologia Genova Italy

Human sensitivity to 3D gross shape changes was measured for the visual and haptic sensory channels. Three volume-invariant affine transformations were defined: compressing, shearing and stretching. Participants discriminated a reference 3D object (cube or sphere) from its deformed shape under three experimental conditions: visual only (on a computer monitor), haptic only (through a point-contact force-feedback device) and visuohaptic simulations. The results indicate that vision is more sensitive to gross shape changes than point-based touch, and that vision dominated in the visuohaptic condition. In the haptic alone condition, thresholds were higher for shearing and stretching than for compressing. Thresholds were otherwise similar for the three transformations in the vision only or visuohaptic conditions. These trends were similar for the two shapes tested. A second experiment, conducted under similar conditions but preventing participants from manipulating object orientations, verified that the main conclusion of our research still holds when visual inspection can rely only on a single perspective view of the object. Our earlier studies on 3D visuohaptic watermarking showed that the haptic channel is more sensitive to surface texture and roughness changes than vision. The thresholds from the present and our earlier studies can potentially be used as the upper limits for selecting watermark strengths in order to ensure watermark imperceptibility in a 3D visuohaptic watermarking system. © 2012 BRILL.

关键词： Watermarking

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A cost-effective multi-gigabit 60-GHz wireless over optical fiber access system based on a novel frequency quintupling technique

A cost-effective multi-gigabit 60-GHz wireless over optical ...

引用

2012 IEEE Photonics Society Summer Topical Meeting Series, PSST 2012

作者： Zhang, Liang Fan, Shu-Hao Liu, Cheng Zhu, Ming Hu, Xiaofeng Li, Zhihua Su, Yikai Chang, Gee-Kung State Key Lab. of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Shanghai 200240 China School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332-0250 United States

We propose and demonstrate a cost-effective wireless over optical fiber access system using frequency quintupling technique. A 2.5-Gb/s OOK signal at 60-GHz is successfully transmitted through 30-km SSMF and 10-ft air... 详细信息

ISBN: (纸本)9781457715266

关键词： Optical fibers

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Systematic method for modeling and designing of an optofluidic sensor to measure the pressure and flow rate

Systematic method for modeling and designing of an optofluid...

引用

20th Iranian Conference on Electrical engineering, ICEE 2012

作者： Mansuri, M. Ebnali-Heidari, M. Mokhtarian, S. Moravvej-Farshi, M.K. Department of Electrical Engineering Najafabad Branch Islamic Azad University Najafabad Iran Faculty of Engineering University of Shahrekord Shahrekord *** Iran Department of Mechanical Engineering Isfahan University of Technology Isfahan Iran Faculty of Electrical and Computer Engineering Advanced Devices Simulation Lab. Tarbiat Modares University PO Box 14115-194 Tehran *** Iran

ISBN: (纸本)9781467311489

In this paper, we present a new method for designing an optofluidic interferometric sensor to measure the pressure and flow rate based on generated optical ring pattern. This sensor consists of a flexible air gap optical cavity whose curvature depends on the pressure. When illuminated by a monochromatic light, the curved surface generates the interference patterns. In our numerical simulations, we take the effects of fluid flow rate, solid deformation, and the light interference into account. We use the beam propagation method (BPM) for simulating the optics and the finite element method (FEM) for simulating the mechanics. This pressure sensor was demonstrated in the working range of 0-60Pa at the constant temperature of 20 C. © 2012 IEEE.

关键词： Finite element method

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