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IEEE International Conference on computer Design: VLSI in computers and Processors, (ICCD)

作者： Arnaldo Azevedo Bart Vermeulen Kees Goossens Department of Software and Computer Technology Delft University of Technology Delft Netherlands NXP Semiconductors Eindhoven Netherlands Electronic Systems Group Faculty of Electrical Engineering Eindhovan University of Technology Eindhoven Netherlands

In this paper, we describe and analyze the architecture of the proposed Debug Event Distribution Interconnect (EDI). The EDI transmits debug events, which are 1-bit signals, between debug entities in different areas of the Network-on-Chip based Multi-Processor System-on-Chip. The EDI replicates the NoC topology with an EDI node instantiated for each underlying NoC data module. Contention in the EDI node is handled by replicating the EDI in layers. The EDI generation is automatic, and uses as input the cross-triggering patterns that are not required to follow the communication patterns in the NoC. The generation and routing tool is also presented in this paper. The EDI is evaluated with four different implementations varying complexity and handling of contention. The area of a single EDI Layer is around 0.9% of the area occupied by the tested NoCs, using the lower area implementation. These results show that the proposed implementation of the EDI incurs low cost on the overall system.

关键词： Monitoring Topology Routing Registers Complexity theory IP networks

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Pierce oscillator circuit topology for high motional resistance CMOS MEMS SAW resonator

Pierce oscillator circuit topology for high motional resista...

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IEEE International Conference on Semiconductor electronics (ICSE)

作者： Jamilah Karim Anis Nurashikin Nordin Ahm Zahirul Alam U. Hashim Electrical Engineering Faculty University Technology MARA Shah Alam Selangor Darul Ehsan Malaysia Electrical and Computer Engineering Department Faculty of Engineering IIUM University Gombak Malaysia Institute of Nano Electronic Engineering (INEE) Universiti Malaysia Perlis Malaysia

This paper presents the design and simulation for a pierce oscillator using CMOS MEMS SAW resonator. The MEMS resonator utilizes surface acoustic waves to generate resonant frequencies of 600MHz and 900MHz. The MEMS resonator is fully compatible with CMOS technology, allowing the possibility of full integration with circuits. The pierce circuit topology was chosen as a sustaining circuit, connected to the resonator to form an oscillator. For simulation purposes, the CMOS MEMS SAW resonator was modeled using its RLC equivalent circuit. The oscillator produces transient oscillation of 300mV peak to peak voltage. The phase noise performance for 600MHz oscillator is -70dBc/Hz at 100 kHz and consume 1.17mW power. The 900MHz oscillator has achieved -63dBc/Hz phase noise at 100 kHz offset frequency and consume about 1.62mW power.

关键词： Oscillators Surface acoustic waves CMOS integrated circuits Micromechanical devices Resonant frequency RLC circuits Semiconductor device modeling

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A Hardware-Software Integrated Design for a High-Performance Java Processor

A Hardware-Software Integrated Design for a High-Performance...

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International Conference on Information technology: New Generations (ITNG)

作者： Anthony S. Fong C.H. Yau Yijun Liu Electronic Engineering Department City University of Hong Kong Hong Kong China Faculty of Computer University Mega Center Guangdong University of Technology Guangzhou China

Today object-oriented programming (OOP) is becoming more and more popular than ever, due to Internet and network computing, and need for resource sharing. Java becomes attractive because of its appealing features such as platform independence and code reusability. However, Java has lower performance than conventional programming languages due to its real-time execution overheads in the layer of Java Virtual Machine (JVM). With increasing performance through higher clock speed or multi-cores, software virtual machines are still needed to run on top of the operating system to execute Java, reducing the effect of the hardware performance improvements. This research proposes a high-performance computer architecture with hybrid system co-design for Java processing. Our FPGA model implemented in VHDL, jHISC, originates hardware support for object-oriented bytecodes, object referencing and method invocation. Moreover, baseline compiler is developed to construct the core structure and to ensure the architecture compatible to the JVM specifications. The project is at present version 4, which is target for mobile and embedded computing. Comparing with the products by Sun Microsystems through evaluation based on SPEC JVM98 benchmark, jHISC V4.0 provide overall performance gain of around 137% over HotSpot JVM and 102% to 1351% over picoJava II.

关键词： Hardware Java Context Heuristic algorithms Dynamic compiler Software computer architecture

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Submicron silicon waveguides and optical splitters for mid-infrared applications

Submicron silicon waveguides and optical splitters for mid-i...

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IEEE International Conference on Group IV Photonics

作者： Milan M. Milošević Milos Nedeljkovic Taha M. Ben Masaud Ehsan Jaberansary Harold M. H. Chong Graham T. Reed Goran Z. Mashanovich Advanced Technology Institute Faculty of Engineering and Physical Sciences University of Surrey Guildford Surrey UK School of Electronic and Computer Science Faculty of Physical and Applied Sciences University of Southampton Southampton UK

We report on the design, fabrication and characterisation of submicron silicon-on-insulator strip waveguides at a 3.74 μm wavelength. Experimental results for 1×2 multi-mode interference splitters are also given.

关键词： Optical waveguides Silicon Propagation losses Strips Photonics Optimized production technology Optical device fabrication

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Abstract reporting and reformation schemes for wireless sensor networks

Abstract reporting and reformation schemes for wireless sens...

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1st International Conference on Wireless Communications and Applications, ICWCA 2011

作者： Goh, Hock Guan Liew, Soung Yue Kwong, Kae Hsiang Michie, Craig Andonovic, Ivan Centre of Intelligent Dynamic Communications Department of Electronic and Electrical Engineering University of Strathclyde 204 George Street Glasgow G1 1XW United Kingdom Department of Computer and Communication Technology Faculty of Information and Communication Technology University of Tunku Abdul Rahman Bandar Barat 31900 Kampar Perak Malaysia MIMOS Berhad Wireless Network and Protocol Research Technology Park Malaysia 57000 Bukit Jalil Kuala Lumpur Malaysia

ISBN: (纸本)9783642291562

Energy resource constraints inherent in wireless sensor network deployments limit the amount of data that can be transported to a destination sink. An alternative strategy that could be invoked to address this issue is to only report the data sample when there is significant change in the sensed data from sensor nodes, and reconstruct the unreported data at the base station without compromising the needs of the application. It is shown that judicious reporting of data significantly reduces the number of packets that are transmitted. In this paper, a mechanism that adopts these principles, referred to as Abstract Reporting and Reformation (ARR), is proposed and demonstrated. © 2012 ICST Institute for computer Science, Social Informatics and Telecommunications engineering.

关键词： Sensor nodes

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Human-induced effects on RSS ranging measurements for cooperative positioning

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International Journal of Navigation and Observation 2012年第1期2012卷

作者： Della Rosa, Francescantonio Pelosi, Mauro Nurmi, Jari Department of Computer Systems Tampere University of Technology Tampere Finland Department of Electronic Systems Faculty of Engineering and Science Aalborg University Aalborg Denmark

We present experimental evaluations of human-induced perturbations on received-signal-strength-(RSS-) based ranging measurements for cooperative mobile positioning. To the best of our knowledge, this work is the first attempt to gain insight and understand the impact of both body loss and hand grip on the RSS for enhancing proximity measurements among neighbouring devices in cooperative scenarios. Our main contribution is represented by experimental investigations. Analysis of the errors introduced in the distance estimation using path-loss-based methods has been carried out. Moreover, the exploitation of human-induced perturbations for enhancing the final positioning accuracy through cooperative schemes has been assessed. It has been proved that the effect of cooperation is very limited if human factors are not taken into account when performing experimental activities. © 2012 Francescantonio Della Rosa et al.

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Optimal Beaconing Control for Epidemic Routing in Delay-Tolerant Networks

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IEEE Transactions on Vehicular technology 2012年第1期61卷 311-320页

作者： Yong Li Zhaocheng Wang Depeng Jin Li Su Lieguang Zeng Sheng Chen State Key Laboratory on Microwave and Digital Communications Tsinghua National Laboratory for Information Science and Technology Department of Electronic Engineering Tsinghua University Beijing China Department of Electronics and Computer Science Faculty of Physical and Applied Sciences University of Southampton Southampton UK Faculty of Engineering King Abdulaziz University Jeddah Saudi Arabia

Owing to the uncertainty of transmission opportunities between mobile nodes, the routing in delay-tolerant networks (DTNs) exploits the mechanism of opportunistic forwarding. Energy-efficient algorithms and policies for DTN are crucial to maximizing the message delivery probability while reducing the delivery cost. In this contribution, we investigate the problem of energy-efficient optimal beaconing control in a DTN. We model the message dissemination under variable beaconing rate with a continuous-time Markov model. Based on this model, we then formulate the optimization problem of the optimal beaconing control for epidemic routing and obtain the optimal threshold policy from the solution of this optimization problem. Furthermore, through extensive numerical results, we demonstrate that the proposed optimal threshold policy significantly outperforms the static policy with constant beaconing rate in terms of system energy consumption savings.

关键词： Energy consumption Routing Optimization Markov processes Simulation Computational modeling Ad hoc networks

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Implementation and optimization of human tracking system using ARM embedded platform

Implementation and optimization of human tracking system usi...

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International Conference on Intelligent and Advanced Systems, ICIAS

作者： Shen Khang Teoh Vooi Voon Yap Chit Siang Soh Patrick Sebastian Department of Computer and Communication Technology Centre for Information Systems and Software Technologies (CISST) Universiti Tunku Abdul Rahman Perak Malaysia Department of Electronic Engineering Faculty of Engineering and Green Technology Universiti Tunku Abdul Rahman Perak Malaysia Department of Electrical and Electronic Engineering Universiti Teknologi Petronas Bandar Seri Iskandar Perak Malaysia

computer vision is a field that includes methods for acquiring, processing, analyzing and understanding images. In the embedded world, computer vision applications have to fight with limited processing power and limited resources to achieve optimized algorithms and high performance. This paper presents work on implementing a human tracking system on both Intel based PC platform and embedded systems to optimize the algorithms for high performance. The algorithms are benchmarked on the Intel platform processor and BeagleBoard xM baed on low-power Texas Instruments (TI) DM3730 ARM processor. Functions and library in OpenCV which developed by Intel Corporation was utilized for building the human tracking algorithms.

关键词： Humans Histograms Image color analysis Libraries computer vision Cameras Signal processing algorithms

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Sensor based home automation and security system

Sensor based home automation and security system

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IEEE Instrumentation and Measurement technology Conference

作者： Mansour H. Assaf Ronald Mootoo Sunil R. Das Emil M. Petriu Voicu Groza Satyendra Biswas Department of Electrical and Electronic Engineering Faculty of Science and Technology University of South Pacific Suva Fiji Department of Information Communications Technology University of Trinidad and Tobago Arima Trinidad and Tobago School of Information Technology and Engineering Faculty of Engineering University of Ottawa Ottawa ONT Canada Department of Computer Science College of Arts and Sciences Troy University Montgomery AL USA School of Engineering and Computer Science Independent University Dhaka Bangladesh

The conventional design of home security systems typically monitors only the property and lacks physical control aspects of the house itself. Also, the term security is not well defined because there is a time delay between the alarm system going on and actual arrival of the security personnel. This paper discusses the development of a home security and monitoring system that works where the traditional security systems that are mainly concerned about curbing burglary and gathering evidence against trespassing fail. The paper presents the design and implementation details of this new home control and security system based on field programmable gate array (FPGA) The user here can interact directly with the system through a web-based interface over the Internet, while home appliances like air conditioners, lights, door locks and gates are remotely controlled through a user-friendly web page. An additional feature that enhances the security aspect of the system is its capability of monitoring entry points such as doors and windows so that in the event any breach, an alerting email message is sent to the home owner instantly.

关键词： Security Hardware Web pages Monitoring Real time systems Browsers electronic mail

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Measurement arrangement for the estimation of path loss exponent in wireless sensor network

Measurement arrangement for the estimation of path loss expo...

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International Conference on computer Sciences and Convergence Information technology (ICCIT)

作者： Chuan Chin Pu Soo Yong Lim Pei Cheng Ooi Department Computer Science & Networked System Faculty of Science & Technology Sunway University Petaling Jaya Malaysia Department Electrical and Electronic Engineering University of Nottingham Malaysia Campus Semenyih Malaysia

ISBN: (纸本)9781467308946

Path loss model is generally used to relate distance and signal strength in wireless applications. This has been widely implemented in ranging, localization, and location tracking systems. A range of extension models have been proposed to enhance the performance for various environments and applications. Nevertheless, path loss exponent remains its significance as the main factor in the model regardless of how the model is varied. Based on the nature as an exponent of the model, inaccurate path loss exponent amplifies the error if it is used to estimate distance from received signal strength. Therefore, measurement of accurate value for path loss exponent becomes very important as it directly influences the output of distance estimation. Researchers have been studying the methods of measuring accurate path loss exponent in various environments. Instead of emphasizing the calculation process, this paper focuses more on the allocation of transmitters and receivers, and the arrangement among them. From the results obtained from experiments, properly arranged transmitter and receiver nodes provides better estimation of the path loss exponent. Based on the results, this paper also proposes a suitable nodes arrangement scheme for path loss exponent estimation.

关键词： Location estimation path loss model radio propagation ranging received signal strength

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