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Synthesis and luminescence properties of novel ZnO nanostructures: Micro and nanospheres, polyhedral cages, tetra-pods, needles, tipped nanorods, nanowires and other "microphone-shaped" structures

Synthesis and luminescence properties of novel ZnO nanostruc...

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2005 MRS Fall Meeting

作者： Khan, Aurangzeb Jadwisienczak, Wojciech M. Kordesch, Martin E. Department of Physics and Astronomy CMSS Program Ohio University Athens OH 45701 United States School of Electrical Engineering and Computer Science Ohio University Athens OH 45701 United States

ISBN: (纸本)1558998543

Novel ZnO nanostructures such as hollow nanospheres, nano-cuges, nanoneedles, tetrupods, nanowires, aligned nanorods and nanotubes are synthesized via thermal evaporation of ZnO and graphite powder mixtures in reduced oxygen atmosphere in the presence of argon and nitrogen flows, The ZnO nanostructures, especially nanospheres, have a unique shape and are hollow inside with walls densely decorated with aligned nanowires, Photoluminescence of synthesized ZnO structures measured at 300 K exhibits a strong near band edge peak at ∼380 nm and deep level green band centered at ∼550 nm. Fabricated ZnO structures can be studied for various applications in optoelectronics and sensors. © 2006 Materials Research Society.

关键词： Nanostructures

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Location management for PCS networks with consideration of mobility patterns

Location management for PCS networks with consideration of m...

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IEEE INFOCOM 2005

作者： Li, Jie Kubota, Atsushi Kameda, Hisao Department of Computer Science Graduate School of Systems and Information Engineering University of Tsukuba Tsukuba Sci. City Ibaraki 305-8573 Japan Doctoral Program in Science and Information Engineering University of Tsukuba Tsukuba Sci. City Ibaraki 305-8573 Japan

ISBN: (纸本)0780389689

This paper addresses the dynamic location management for personal communication service (PCS) networks with consideration of mobility patterns. The popular hexagonal cellular architecture is considered. In this paper, we first introduce a coordinate system for the hexagonal cellular architectures. Then, we develop an all-direction mobility model based on the coordinate system for the hexagonal cellular architecture to cope with the mobility patterns of mobile terminals (MTs). The shape and size of the local area (LA) in the dynamic location management scheme is determined by minimizing the total location management cost with bounding the paging cost The optimization problem is transferred to maximize expected number of cells traversed by the MT in the LA with a given size of the LA. The analytic model of calculating the probabilities of any MT's moving is established. An algorithm is proposed to solve the optimization problem efficiently. © 2005 IEEE.

关键词： Data transfer

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A comparative evaluation of competitive learning algorithms for edge detection enhancement

A comparative evaluation of competitive learning algorithms ...

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13th European Signal Processing Conference, EUSIPCO 2005

作者： Sirin, Tuba Saglam, Mehmet Izzet Erer, Isin Gokmen, Muhittin Ersoy, Okan Informatics Institute Advanced Technologies in Engineering Computer Science and Engineering Maslak Istanbul 34469 Turkey Informatics Institute Advanced Technologies in Engineering Satellite Communication and Remote Sensing Program Maslak Istanbul 34469 Turkey Faculty of Electrical and Electronic Engineering Electronics and Communication Department Maslak Istanbul 34469 Turkey Faculty of Electrical and Electronic Engineering Computer Engineering Department Istanbul Technical University Maslak Istanbul 34469 Turkey Purdue University School of Electrical and Computer Engineering West Lafayette IN United States

ISBN: (纸本)1604238216

Most edge detection algorithms include three main stages: smoothing, differentiation, and labeling. In this paper, we evaluate the performance of algorithms in which competitive learning is applied first to enhance edges, followed by an edge detector to locate the edges. In this way, more detailed and relatively more unbroken edges can be found as compared to the results when an edge detector is applied alone. The algorithms compared are K-Means, SOM and SOGR for clustering, and Canny and GED for edge detection. Perceptionally, best results were obtained with the GED-SOGR algorithm. The SOGR is also considerably simpler and faster than the SOM algorithm.

关键词： Edge detection

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A segmentation method using compound Markov random fields based on a general boundary model

A segmentation method using compound Markov random fields ba...

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IEEE International Conference on Image Processing

作者： Jue Wu A.C.S. Chung Bioengineering Program and Department of Computer Science School of Engineering Hong Kong University of Science and Technology Hong Kong China

Markov random field (MRF) theory has widely been applied to segmentation in noisy images. This paper proposes a new MRF method. First, it couples the original labeling MRF with a boundary MRF that can help improve the performance of segmentation. Second, the boundary model is general and does not need prior training. Third, unlike existing related work, our model offers more compact interaction between the two MRFs. Experiments on synthetic images and real clinical datasets show that the proposed approach is able to produce good segmentation results, especially removing noise in low signal-to-noise ratio regions.

关键词： Markov random fields Image segmentation Labeling Signal to noise ratio Image restoration Lattices Biomedical engineering computer science Image analysis Surface reconstruction

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Synthesis and luminescence properties of novel ZnO nanostructures: micro and nanospheres, polyhedral cages, tetra-pods, needles, tipped nanorods, nanowires and other “microphone–shaped” structures

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MRS Online Proceedings Library 2005年第1期900卷 1-6页

作者： Aurangzeb Khan Wojciech M. Jadwisienczak Martin E Kordesch Department of Physics and Astronomy and CMSS Program Ohio University Athens USA School of Electrical Engineering and Computer Science Ohio University Athens USA

Novel ZnO nanostructures such as hollow nanospheres, nano-cages, nanoneedles, tetra-pods, nanowires, aligned nanorods and nanotubes are synthesized via thermal evaporation of ZnO and graphite powder mixtures in reduced oxygen atmosphere in the presence of argon and nitrogen flows. The ZnO nanostructures, especially nanospheres, have a unique shape and are hollow inside with walls densely decorated with aligned nanowires. Photoluminescence of synthesized ZnO structures measured at 300 K exhibits a strong near band edge peak at ∼380 nm and deep level green band centered at ∼550 nm. Fabricated ZnO structures can be studied for various applications in optoelectronics and sensors.

关键词： nanostructure luminescence semiconducting

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Elementary science classroom learning with wireless response devices - Implementing active and experiential learning

Elementary science classroom learning with wireless response...

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IEEE International Workshop on Wireless and Mobile Technologies in Education, WMTE 2005

作者： Chen, Yu-Fen Liu, Chen-Chung Yu, Ming-Hung Chang, Sung-Bin Lu, Yun-Chen Chan, Tak-Wai Dept. of Computer Science Information Engineering National Central University Taiwan Graduate Institute of Network Learning Technology National Central University Taiwan Degree Program of E-Learning College of Science National Chiao Tung University Taiwan Chu-Wei Elementary School Taiwan

ISBN: (纸本)0769523854

Active learning enables learners to actively engage in learning. Learning not only transfers material to students for learning, but also encourages greater mental engagement and more extensive student-student and student-instructor interaction than does a typical lecture class. Peer Instruction (PI) engages students in active learning by achieving continuous instructor-student interaction in a physics lecture. However, the methodologies and the effectiveness of implementing PI for elementary school students have seldom been clarified. This study explores the possibility of adopting PI in an elementary science classroom. The research considerations of the study are as follows: (1) how wireless technology can enhance PI in elementary science classroom;(2) how a teacher can engage students in pre-class reading, and (3) whether elementary school students have sufficient social skills to perform a PI discussion? These questions are examined by observing how the PI pedagogical model worked with a wireless response system in elementary science classroom. Based on the observation, this study also proposes a way of improving the PI learning experience of elementary school students by adding experiments and observations during peer discussion to explain concepts and phenomena in physics. © 2005 IEEE.

关键词： Learning systems

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Optical flow-based tracking of deformable objects using a non-prior training active feature model 5th

Optical flow-based tracking of deformable objects using a no...

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5th Pacific Rim Conference on Multimedia, PCM 2004

作者： Kim, Sangjin Kang, Jinyoung Shin, Jeongho Lee, Seongwon Paik, Joonki Kang, Sangkyu Abidi, Besma Abidi, Mongi Image Processing and Intelligent Systems Laboratory Department of Image Engineering Graduate School of Advanced Imaging Science Multimedia and Film Chung-Ang University 221 Huksuk-Dong Tongjak-Ku Seoul156-756 Korea Republic of Imaging Robotics and Intelligent Systems Laboratory Department of Electrical and Computer Engineering The University of Tennessee KnoxvilleTN37996-2100 United States

ISBN: (纸本)9783540239857

This paper presents a feature point tracking algorithm using optical flow under the non-prior training active feature model (NPT-AFM) framework. The proposed algorithm mainly focuses on analysis of deformable objects, and provides real-time, robust tracking. The proposed object tracking procedure can be divided into two steps: (i) optical flow-based tracking of feature points and (ii) NPT-AFM for robust tracking. In order to handle occlusion problems in object tracking, feature points inside an object are estimated instead of its shape boundary of the conventional active contour model (ACM) or active shape model (ASM), and are updated as an element of the training set for the AFM. The proposed NPT-AFM framework enables the tracking of occluded objects in complicated background. Experimental results show that the proposed NPT-AFM-based algorithm can track deformable objects in real-time. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Optical flows

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Modeling of human driving behavior based on piecewise linear model

Modeling of human driving behavior based on piecewise linear...

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IEEE International Symposium on Industrial Electronics 2005, ISIE 2005

作者： Kim, Jong-Hae Okuma, Shigeru Kim, Young-Woo Hwang, Don-Ha Kim, Min-Huei Kim, Dong-Hee Dept. of Electrical Engineering and Computer Science Graduate School of Engineering Nagoya University Japan Space Robotics Research Center Toyota Technological Institute Nagoya City Japan Changwon Korea Republic of Dept. of Electrical and Automation Eng. Yeungnam College of Sci. and Tech. Daegu Korea Republic of Dept. of Electrical Engineering Yeungnam University Kyongsan Kyungbuk Korea Republic of

ISBN: (纸本)0780387384

This paper presents the development of the modeling strategy of the human driving behavior based on the expression as Piecewise Linear (PWL) model focusing on the driver's stopping maneuver. The driving data are collected by using the three-dimensional driving simulator based on CAVE, which provides stereoscopic immersive vision. In our modeling, the relationship between the driver's sensory information and the operation of the driver such as braking amount is expressed by PWL model, which is a class of Hybrid Dynamical System (HDS). The identification problem for the PWL model is formulated as the Mixed Integer Linear programming (MILP) by transforming the switching conditions into binary variables. From the obtained results, it is found that the driver appropriately switches the 'control low' according to the sensory information. These results enable us to capture not only the physical meaning of the driving skill, but also the decision-making aspect (switching conditions) in the driver's stopping maneuver. © 2005 IEEE.

关键词： Behavioral research

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Annotation-based rescue assistance system for teleoperated unmanned helicopter with wearable augmented reality environment

Annotation-based rescue assistance system for teleoperated u...

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IEEE International Workshop on Safety, Security, and Rescue robotics (SSRR)

作者： M. Koeda Y. Matsumoto T. Ogasawara Collage of Information Science and Engineering Department of Human and Computer Intelligence Ritsumeikan University Kusatsu Shiga Japan Graduate School of Information Science Robotics Laboratory Nara Institute of Science and Technology Ikoma Nara Japan

We introduce an annotation-based rescue assistance system for a teleoperated unmanned helicopter with an wearable augmented reality (AR) environment. In this system, an operator controls the helicopter remotely while watching an annotated view from the helicopter through a head mounted display (HMD) with a laptop PC in a backpack. Virtual buildings and textual annotations assist the rescue operation indicating the position to search rapidly and intensively. The position and the attitude of the helicopter is measured by a GPS and a gyroscope, and sent to the operator's PC via a wireless LAN. Using this system, we conducted experiments to find persons and verified the feasibility.

关键词： Helicopters Augmented reality Control systems Gyroscopes Wireless LAN Global Positioning System Cameras Information science Intelligent robots Robot kinematics

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Recognizing interaction from a robot's perspective

Recognizing interaction from a robot's perspective

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IEEE International Workshop on Robot and Human Communication (ROMAN)

作者： T. Salter F. Michaud K. Dautenhahn D. Letourneau S. Caron LABORIUS-Research Laboratory on Mobile Robotics and Intelligent Systems Department of Electrical Engineering and Computer Engineering Université de Sherbrook Sherbrooke QUE Canada Adaptive Systems Research Group School of Computer Science University of Herfordshire Hatfield UK

For meaningful interaction between a robot and a human, an autonomous robot must recognize whether the experienced situation is created by people or by the environment. Using only proprioceptive data from a mobile robotic platform, we discover that it is possible to distinguish sensory data patterns involving interaction. These patterns are obtained whilst navigating varying environments, both human populated and unpopulated. The paper reports the initial set of trials using Roball, a spherical mobile robot. Also described is the experimental methodology currently followed to validate the hypothesis that child interaction can be perceived directly from navigation sensors onboard a robotic platform.

关键词： Robot sensing systems Mobile robots Human robot interaction Navigation Intelligent robots Sensor phenomena and characterization Infrared sensors Educational institutions Plastics Mobile computing

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