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Color image segmentation based on adaptive level set and region statistical information

Color image segmentation based on adaptive level set and reg...

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Chinese Conference on Pattern Recognition

作者： Wang, Xi-Li Feng, Yuan Department of Computer Science Shaanxi Normal University Xi'an 710062 China Research Center of Electron Communication System and Electron Antagonize Technique Air Force Engineering University Xi'an 710051 China

ISBN: (纸本)9781424472109

This paper proposed an adaptive level set algorithm combining region statistical information for color image segmentation. In this model, we deduce image segmentation model with Maximum a posteriori according to Bayesian theory, and combine it into GAC model. Firstly, construct a speed stop function based on region statistical information which combines region statistical character and Bayesian model. And apply it to image segmentation on color images. Secondly, construct alterable coefficient based on a posteriori of segmented image of inside and outside the curve. It aims to change evolution direction adaptively based on the information of image. Thirdly, eliminate the re-initialization procedure by introducing interior restrict energy term of the Li method. At the same time, simplify the definition of the initial level set function. Experimental results show that this method has the advantages of evolving adaptively and stable numerical solution, and can extract the real edge of object from color image efficiently, so that is an effective image segmentation method. ©2010 IEEE.

关键词： Image segmentation

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Method for measuring the twist angle of an optically compensation bend by using the heterodyne interferometry

Method for measuring the twist angle of an optically compens...

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IEEE Instrumentation and Measurement Technology Conference

作者： Shinn-Fwu Wang Wesley Lai Jyh-Shyan Chiu Rih-Huei Yeh Heng-Cheng Tseng Wei-Chou Chen Department of Electronic Engineering Ching Yun University of Technology Taoyuan Taiwan Institute of Computer Communication and System Engineering Ching Yun University of Technology Taoyuan Taiwan Research & Development Center Hannstar Display Corporation Tainan Taiwan

ISBN: (纸本)9781424428328

A new measuring method based on the common-path heterodyne interferometry is used to determine the twist angle, pre-tilt angle, and cell gap of an optically compensation bend (OCB) liquid crystal (LC) cell. In this paper, the twist angle of an OCB LC cell can be determined by measurement the phase difference instead of the reflectance difference. Because the measuring system is based on the common-path heterodyne interferometry, it can provide the most sensitive way to measure the twist angle of an OCB LC cell against the air turbulence and environmental vibrations. The method has some merits, e.g., a simple setup, in real-time test and reliability, etc.

关键词： Optical interferometry Goniometers Optical mixing Liquid crystal displays Electrooptic modulators Light sources Optical retarders Optical sensors Phase measurement Vibration measurement

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A high efficiency and multi-band/multi-mode power amplifier using a distributed second harmonic termination

A high efficiency and multi-band/multi-mode power amplifier ...

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作者： Kim, Jangheon Mkadem, Farouk Boumaiza, Slim Telecommunication System Division Digital Media and Communication Business Samsung Electronics Co. Ltd. 416 Maetan 3-dong Yeongtong-gu 443-742 Korea Republic of Department of Electrical and Computer Engineering University of Waterloo 200 University Ave West Waterloo ON N2L 3G1 Canada

ISBN: (纸本)9782874870163

This paper proposes a new broadband saturated power amplifier (SPA) with a distributed second harmonic termination supporting multi-band/multi-mode operation. The proposed network is composed of a fundamental matching circuit and multiple second harmonic termination circuits. Due to the multiple harmonic terminations, the proposed PA improves the frequency range where the PA can achieve a high efficiency. The proposed PA is fabricated using a 45 W Cree CGH40045 GaN HEMT. Drain efficiencies of greater than 60% (average 66%) are achieved between about 1.8 GHz and 2.3 GHz (500 MHz bandwidth). When driven with long term evolution (LTE) and two carrier wideband code division multiple access (WCDMA) signals at DCS1800, PCS1900, and WCDMA bands, the linearity specifications of the corresponding standards are satisfied using the digital predistortion linearization technique, and it attains an efficiency of greater than 30%. © 2010 EuMA.

关键词： III-V semiconductors

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An active uplink photonic antenna

An active uplink photonic antenna

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Asia-Pacific Conference on Applied Electromagnetics, APACE

作者： N. F. Nanyan Siti Zaiton Mohd Hashim R. Ngah Y. Rahayu T. Prakoso Wireless Communication Centre Faculty of Electrical Engineering Universiti Teknologi Malaysia Johor Malaysia Department of Software Engineering Faculty of Computer Science & Information System Universiti Teknologi Malaysia Malaysia Faculty of Mechanical Engineering Universiti Malaysia Pahang Kuantan Pahang Malaysia

This paper presents a wideband photonic antenna consisting the laser diode, matching circuit, RF amplifier and microstrip patch antenna are fabricated and connected together to perform in uplink system. Laser driver is used to supply the dc biasing for the laser. Lastly, the LD-matching circuit, RF amplifier and antenna were arrange together and connected to perform the wireless uplink system. The simulated and measured results are presented and discussed. These results show useful photonic antenna design that achieves relatively wide bandwidth and has potential to be applied in RoF technology.

关键词： Photonics Microstrip antennas Antenna measurements Frequency measurement Diode lasers Microstrip

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Object recognition using visuo-affordance maps

Object recognition using visuo-affordance maps

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2010 IEEE/RSJ International Conference on Intelligent Robots and systems

作者： Arjan Gijsberts Tatiana Tommasi Giorgio Metta Barbara Caputo Department of Robotics Brain and Cognitive Sciences Italian Institute of Technology Genoa Italy Centre Du Parc Idiap Research Institute Martigny Switzerland Department of Communication Computer and System Sciences Faculty of Engineering University of Genova Genoa Italy

One of the major challenges in developing autonomous systems is to make them able to recognize and categorize objects robustly. However, the appearance-based algorithms that are widely employed for robot perception do not explore the functionality of objects, described in terms of their affordances. These affordances (e.g., manipulation, grasping) are discriminative for object categories and are important cues for reliable robot performance in everyday environments. In this paper, we propose a strategy for object recognition that integrates both visual appearance and grasp affordance features. Following previous work, we hypothesize that additional grasp information improves object recognition, even if we reconstruct the grasp modality from visual features using a mapping function. We considered two different representations for the grasp modality: (1) motor information of the hand posture while grasping and (2) a more general grasp affordance descriptor. Using a multi-modal classifier we show that having real grasp information significantly boost object recognition. This improvement is preserved, although to a lesser extent, if the grasp modality is reconstructed using the mapping function.

关键词： Visualization Training Object recognition Image reconstruction Kernel Grasping Robots

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Self-assembly and recrystallization of bacterial S-layer proteins of Bacillus sphaericus and Bacillus thuringiensis on silicone, mica and quartz crystal supports

Self-assembly and recrystallization of bacterial S-layer pro...

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

作者： Neda Habibi Federico Caneva Soumetz Massimo Giulianelli Laura Pastorino Oscar Herrera Francesca Sbrana Roberto Raiteri Carmelina Ruggiero Department of Communication Computer and System Sciences Nanobiotechnology and Medical Informatics Laboratory University of Genova Italy Consiglio Nazionale delle Ricerche Area di Ricerca di Napoli 1 Napoli Campania IT Biophysical and Electronic Engineering Department Genoa Italy

The Oriented architecture of macromolecules plays a critical role in many aspects of Nanobiotechnology such as in the development of biosensors. To this regard, S-layers which constitute the outermost cell envelope component of many prokaryotic organisms, represent unique self assembled systems with the capability to rearrange into monomolecular and oriented arrays. These properties can be exploited to promote their crystallization on surfaces (e.g. silicone) which is pivotal for the subsequent immobilization of macromolecules and development of new biosensors. In this work the crystallization of bacterial S-layers obtained from Bacillus thuringiensis and Bacillus sphaericus CCM2177 on silicone, mica and quartz crystal surfaces were investigated. The SDS page results of S-layers isolated from the above mentioned bacteria put in evidence that their molecular weight (MW) was around 120 KDa and, as reported in the literature, slightly higher for those extracted by Bacillus thuringiensis. In addition, results showed that S-layers isolated from Bacillus thuringiensis form large crystalline domains on mica after 5 min whereas those extracted from Bacillus sphaericus CCM 2177 form a compact monolayer on silicone after 2 h. Results in this work put in evidence the possibility to use these substrates for the fabrication of sensitive biosensors.

关键词： Proteins Microorganisms Crystallization Biosensors Silicon Surface treatment

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Notice of Retraction: Enhancement of collaborative filtering performance under data scarcity environment

Notice of Retraction: Enhancement of collaborative filtering...

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International Conference on New Trends in Information and Service Science, NISS

作者： Seok Jun Lee Hee Choon Lee Sun Ok Kim Department of Management Information System Sangji University Wonju Gangwon South Korea Department of Computer Data Information Sangji University Wonju Gangwon South Korea School of Information Communication & Broadcasting Engineering Halla University Wonju Gangwon South Korea

This article has been retracted by the publisher.

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A high efficiency and multi-band/multi-mode power amplifier using a distributed second harmonic termination

A high efficiency and multi-band/multi-mode power amplifier ...

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作者： Kim, Jangheon Mkadem, Farouk Boumaiza, Slim Telecommunication System Division Digital Media and Communication Business Samsung Electronics Co. Ltd 416 Maetan 3-dong Yeongtong-gu Suwon-si Gyeonggi-do 443-742 Korea Republic of Department of Electrical and Computer Engineering University of Waterloo 200 University Ave West Waterloo ON N2L 3G1 Canada

ISBN: (纸本)9782874870156

关键词： III-V semiconductors

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A novel DoubleMinOver classifier based On second-order tensor

A novel DoubleMinOver classifier based On second-order tenso...

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International Conference on Natural Computation (ICNC)

作者： Zhe Wang Rui Han Zhisong Pan Xuelei Ni Department of Computer Science & Engineering East China University of Science and Technology Shanghai China Department of Information & Communication Engineering Huaian College of Information and Technology Jiangsu China Institute of Command Automation People''s Liberation Army University of Science and Technology Nanjing China Department of Information System Shanghai Automotive Industry Corporation Shanghai China

It is well-known that the DoubleMinOver classifier as an extendibility of MinOver was developed to provide a maximum margin solution with a bias. But, it can be found that the DoubleMinOver algorithm only classifies the vector pattern and fails to work in the pattern represented with the second-order tensor. In this paper, we propose a novel DoubleMinOver classifier named STDoubleMinOver that can directly classify the second-order tensor pattern. Compared with the existing DoubleMinOver with only one weight w, the proposed STDoubleMinOver induces two weight vectors u and v so as to deal with the second-order tensor. The experiments here have demonstrated that the proposed STDoubleMinOver has a superior classification to the vectorized DoubleMinOver.

关键词： Tensile stress Feature extraction Accuracy Artificial neural networks Training Lenses Iris

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The InterMedia networking and security architecture for user centric multimedia convergence

The InterMedia networking and security architecture for user...

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International Symposium on Performance Evaluation of computer & Telecommunication systems SPECTS

作者： Matteo Repetto Riccardo Rapuzzi Stefano Chessa Stefano Lenzi John Gialelis Tasos Fragopoulos Consorzio Nazionale Interuniversitario per le Telecomunicazioni Parma Italy Department of Communication Computer and System Science (DIST) University of Genoa Italy CNR (ISTI-CNR) Instituto di Scienza e Tecnologie dell'Informazione France Computer Science Department University of Pisa Pisa Italy Industrial Systems Institute University of Patras Greece Electrical Engineering Department University of Patras Greece

The InterMedia project aims at progressing towards user-centric convergence of multimedia, by putting the user at the center of services (multimedia applications), devices and interfaces for the interaction. One of the main implications of the user-centric approach is the seamless and secure access to content, regardless of the users' location and terminal device(s), which requires suitable solutions to manage mobility, context-awareness and digital rights. Under this respect this paper reviews the mechanisms developed within InterMedia to support the above issues, and discusses their integration in a common networking framework addressing a generic scenario for content access.

关键词： Sensors Context Licenses Multimedia communication Protocols Servers Transform coding

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