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Conference on Local computer Networks (LCN)

作者： H. Shafiei F. Hoseini A. Khonsari M. Ould-Khaoua School of Computer Science Institute of Studies in Theoretical Physics and Mathematics Tehran Iran Department of Electrical and Computer Engineering University of Tehran Tehran Iran Department of Computing Sciences University of Glasgow UK

In this paper, we proposed a graph theoretic approach employing an algorithmic method to construct constant-degree graphs possessing not only provably minimum diameter, but also maximum connectivity with respect to ot... 详细信息

关键词： Graph theory Peer to peer computing Network topology Topology Scalability Meteorology Eigenvalues and eigenfunctions

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A thermally actuated organic display device using thermo-chromatic polymer composite film with self-aligned patterns

A thermally actuated organic display device using thermo-chr...

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IEEE International Conference on Micro Electro Mechanical Systems

作者： Oktay Yarimaga Maesoon Im Bonsang Gu Tae Won Kim Yun Kyung Jung Hyun Gyu Park Yang-Kyu Choi Division of Electrical Engineering School of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea Chemical and Biomolecular Engineering Department KAIST Daejeon South Korea

A thermally actuated organic display device using UV-sensitive polydiacetylene (PDA)-polyvinyl alcohol (PVA) composite film with self aligned patterns is presented. A novel technique that patterns UV-sensitive organic films on a transparent substrate using a chip-embedded photomask is demonstrated. In contrast to related works regarding PDA and its composites, the current investigation represents the first attempt to realize a PDA derivative film for a thermal-display. Micro-pixels ranging from 200 mum to 700 mum size were fabricated on a glass substrate. The transition tones of the blue, red and yellow micro-pixels were successfully tuned with embedded micro-heaters under the PDA-PVA layer using both low-temperature (75degC) and high-temperature (180degC) activation processes. The retention time was measured and found to be less than a few hundred milliseconds.

关键词： Polymer films Substrates Fabrication Personal digital assistants Chemical technology computer displays Glass Thermal stresses Temperature Electrochromism

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A Combinatorial Approach for Key-Distribution in Wireless Sensor Networks

A Combinatorial Approach for Key-Distribution in Wireless Se...

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IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

作者： H. Shafiei A. Mehdizadeh A. Khonsari M. Ould-Khaoua School of Computer Science Institute of Studies in Theoretical Physics and Mathematics Tehran Iran Department of Computer Engineering Amirkabir University of Technology슠 Tehran Iran Department of Electrical and Computer Engineering University of Tehran Tehran Iran Department of Computing Sciences University of Glasgow UK

Sensor nodes are usually deployed in adversarial environments in which they are subject to compromise and revelation of critical information rendering the entire network useless. Therefore, secure communication of wireless sensor networks (WSNs) necessitates utilization of efficient key distribution schemes. Over the past few years, several works using probabilistic, deterministic and hybrid methods have been conducted to address key distribution among sensor nodes. In this paper we propose a novel method to deterministically distribute key-chains throughout a WSN utilizing expander graphs based on the Zig-Zag graph product. Given a set of constraints such as network size, amount of storage, radio range and key-chain length, we are able to efficiently construct a resilient yet scalable key distribution graph. The main advantage of the obtained method is providing a more user-adjustable and predictable framework compared to the previously proposed approaches. Simulation results demonstrate the efficiency of our proposed scheme and its general applicability to different network paradigms with diverse requirements.

关键词： Wireless sensor networks Resilience computer networks Scalability Graph theory Wireless communication Security computer science Impedance Intrusion detection

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Interferometric synthetic aperture microscopy

Interferometric synthetic aperture microscopy

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OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference

作者： Boppart, A. Ralston, Tyler S. Marks, Daniel L. Carney, P. Scott Beckman Institute for Advanced Science and Technology Department of Medicine 405 North Mathews Avenue Urbana IL 61801 United States Department of Electrical and Computer Engineering Department of Medicine 405 North Mathews Avenue Urbana IL 61801 United States Department of Bioengineering Department of Medicine 405 North Mathews Avenue Urbana IL 61801 United States

Interferometric synthetic aperture microscopy (ISAM) provides high-resolution three-dimensional optical images of highly-scattering samples with large depth-of-field without scanning the focal plane, ISAM can function... 详细信息

ISBN: (纸本)9781557528551

关键词： Synthetic apertures

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Thermal-aware electrical analysis of high-speed interconnect

Thermal-aware electrical analysis of high-speed interconnect

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electrical Design of advanced Packaging and Systems Symposium, EDAPS

作者： En-Xiao Liu Er-Ping Li Xingchang Wei Advanced Electronic and Electromagnetics Programme A STAR Institute of High Performance Computing Singapore Department of Electrical and Computer Engineering National University of Singapore Singapore

This paper studied the problem of coupled electrical and thermal modeling, specifically for the signal integrity analysis of on-chip interconnect due to the influence of substrate and interconnect temperature. The approach presented in this paper is using finite-difference method (FDM) to solve for the temperature profile of the substrate. The information of the substrate temperature is used for subsequent thermal modeling of the interconnect. The 1D thermal modeling of the interconnect is done by using an equivalent thermal circuit model, which is compatible with the SPICE simulator and can fast produce the temperature profile of the interconnect. Numerical examples are presented, which show that the temperature of the interconnect affects the electrical performance of the interconnect.

关键词： Integrated circuit interconnections Temperature RLC circuits Performance analysis Degradation Coupled mode analysis Signal analysis Equivalent circuits Electromagnetic modeling Electrostatics

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Extracting age information from local spatially flexible patches

Extracting age information from local spatially flexible pat...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Shuicheng Yan Ming Liu Thomas S. Huang Department of Electrical and Computer Engineering National University of Singapore Singapore Beckman Institute for Advanced Science and Technology University of Illinois Urbana-Champaign USA

Motivated by the fact that age information can often be observed from local evidence on the human face, we contribute to the age estimation problem in two aspects. On the one hand, we present a new feature descriptor, called spatially flexible patch (SFP), which encodes the local appearance and position information simultaneously. SFP has the potential to alleviate the problem of insufficient samples owing to that SFPs similar in appearance yet slightly different in position can still provide similar confidence for age estimation. One the other hand, the SFP associated with age label is modeled with Gaussian Mixture Model, and then age estimation is conducted by maximizing the sum of likelihoods from all the SFPs associated with the hypothetic age. Experiments are conducted on the YAMAHA database with 8,000 face images and ages ranging from 0 to 93. Compared with the latest reported results, our new algorithm brings encouraging reduction in mean absolute error for age estimation.

关键词： Data mining Humans Face Image databases Spatial databases Neural networks Aging Uncertainty Pixel Estimation error

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Random Networks and Aligned Arrays of Single-Walled Carbon Nanotubes for Electronic Device Applications

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Nano Research 2008年第4期1卷 259-272页

作者： Qing Cao John A.Rogers Department of Chemistry University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA Department of Materials Science and Engineering University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA Department of Electrical and Computer Engineering University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA Department of Mechanical Science and Engineering University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA Frederick-Seitz Materials Research Laboratory University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA

Singled-walled carbon nanotubes(SWNTs),in the form of ultrathin fi lms of random networks,aligned arrays,or anything in between,provide an unusual type of electronic material that can be integrated into circuits in a conventional,scalable *** electrical,mechanical,and optical properties of such fi lms can,in certain cases,approach the remarkable characteristics of the individual SWNTs,thereby making them attractive for applications in electronics,sensors,and other *** review discusses the synthesis and assembly of SWNTs into thin film architectures of various types and provides examples of their use in digital electronic circuits with levels of integration approaching 100 transistors and in analog radio frequency(RF)systems with operating frequencies up to several gigahertz,including transistor radios in which SWNT transistors provide all of the active *** results represent important steps in the development of an SWNT-based electronics technology that could fi nd utility in areas such as fl exible electronics,RF analog devices and others that might complement the capabilities of established systems.

关键词： Carbon nanotubes electronic devices thin-film transistors

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Development of Welding Profile Sensor and Its Application

Development of Welding Profile Sensor and Its Application

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2008 International Conference on Smart Manufacturing Application (ICSMA 2008)

作者： Chang-Hyun Kim Tae-Yong Choi Ju-Jang Lee Jeong Suh Kyoung-Taik Park Hee-Shin Kang Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea Korea Institute of Machinery & Materials Daejeon South Korea

This paper describes the development of a welding profile sensor for the laser welding robot application. The sensor consists of a PC based vision camera and a stripe-type laser diode. All components are assembled into a compact module which can be attached to the end-effector of welding robots. The laser-stripe sensor can measure the profile of the welding object and obtain the seam line. Moreover, the working distance of the sensor can be varied. The robot, the seam tracking system, and CW Nd:YAG laser are used for the laser welding robot system. The simple control scheme of the whole system is also presented. The profile measurement and the seam tracking experiments were carried out to validate the operation of the system.

关键词： Laser welding Vision Sensor Profile Gap Seam Tracking

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Multiple Heterogeneous Ant Colonies with Information Exchange

Multiple Heterogeneous Ant Colonies with Information Exchang...

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Congress on Evolutionary Computation

作者： Arash Arami Bijan Rahmizadeh Rofoee Caro Lucas Control and Intelligent Processing Center of Excellence (CIPCE) school of Electrical and Computer Engineering University of Tehran Tehran Iran Electrical and Computer Engineering Department Tabriz University Tabriz Iran School of Cognitive Science Institute of Studies in Theoretical Physics and Mathematics Tehran Iran CIPCE school of Electrical and Computer Engineering University of Tehran Tehran Iran

The method of multiple heterogeneous ant colonies with information exchange (MHACIE) is presented in this paper with emphasis on the speed of finding the optimal solution and the corresponding computational complexity. The proposed method which is inspired by biology and psychology has a structure composed of several ant colonies. These colonies participate in solving problems in a concurrently manner and also exchange information with each other in communicational steps. Each ant colony is considered as an intelligent agent with behavioral traits. These behavioral traits play a key role in the solving procedure, in interrelation circumstances and in installation of relations. Faster solutions have been achieved using different employments of agents in the algorithm structure. Experimental results show the superiority of Multiple heterogeneous ant colonies algorithm in comparison to the standard ant colony system (ACS) and particle swarm optimization (PSO) algorithms on different benchmarks. A dynamic, control engineering benchmark is also provided in order to gain a more complete evaluation of the proposed algorithm.

关键词： Benchmark testing Evolution (biology) Optimization Heuristic algorithms Evolutionary computation Electronic mail Educational institutions

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Intelligent vision sensor for the robotic laser welding

Intelligent vision sensor for the robotic laser welding

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IEEE International Conference on Industrial Informatics (INDIN)

The intelligent sensory system is required to ensure the accurate welding performance. This paper describes the development of an intelligent vision sensor for the robotic laser welding. The sensor system includes a PC based vision camera and a stripe-type laser diode. A set of robust image processing algorithms are implemented. The laser-stripe sensor can measure the profile of the welding object and obtain the seam line. Moreover, the working distance of the sensor can be changed and other configuration is adjusted accordingly. The robot, the seam tracking system, and CW Nd:YAG laser are used for the laser welding robot system. The simple and efficient control scheme of the whole system is also presented. The profile measurement and the seam tracking experiments were carried out to validate the operation of the system.

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