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A novel multichannel analog-to-time converter based on a multiplexed sigma delta converter

A novel multichannel analog-to-time converter based on a mul...

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Annual IEEE Northeast Workshop on Circuits and Systems (NEWCAS)

作者： Masoud Rezaei Esmaeel Maghsoudloo Mohamad Sawan Benoit Gosselin Dept. of Electrical and Computer Eng. Université Laval Quebec QC Canada Department of Electrical Engineering Polytechnique Montréal Montréal QC Canada

In this paper, a new sigma delta modulator based on a multiplexed input topology is proposed to decrease power consumption and size in implantable bio-interfacing systems. An opamp sharing technique is employed in order to process several input sequentially. The proposed sigma delta modulator integrates each input separately and stores the integrated value inside a dedicated capacitor. We show that the resulting transfer function of the modulator is equivalent for all channels. The proposed circuit has been implemented in a 180-nm TSMC process. The circuit includes 4 channels and consumes 11.5 μW per channel, provides an ENOB of 7.8 bits, and presents a bandwidth of 10 kHz. The chip area for the proposed design is 150 μm × 135 μm for 4 multiplexed inputs.

关键词： Sigma-delta modulation Multiplexing Pulse width modulation Converters Layout Noise

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A power-efficient wide-range signal level-shifter

A power-efficient wide-range signal level-shifter

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Annual IEEE Northeast Workshop on Circuits and Systems (NEWCAS)

作者： E. Maghsoudloo M. Rezaei M. Sawan B. Gosselin Dept. of Electrical and Computer Eng. Université Laval Quebec QC Canada Department of Electrical Engineering Polytechnique Montréal Montréal QC Canada

In this paper, we propose a level shifter circuit that is able to convert signal levels of subthreshold values to super-threshold signal levels. Such a circuit is using a new voltage level shifter topology employing a level-shifting capacitor. This capacitor is charged only when the logic levels of the input and output signals are not corresponding to a high-to-low transition of the input signal. The proposed circuit has a small silicon area, low-power consumption and short propagation delay. Post-layout Simulation results for the proposed circuit implemented in a 0.18-μm 1P6M CMOS technology confirm that the power consumption of this circuit is extremely low comparing to other topologies, and is able to operate over a wide range of the input voltages from 50 mV to 1.8 V, and a wide range of frequencies from 100 Hz to 100 MHz. For both a 0.4 V and a 1.8V supply voltages, the proposed circuit has a propagation delay of 10.43 ns and a power consumption of 9.89 nW for a 10-kHz input signal.

关键词： Capacitors Power demand Delays Logic gates Simulation Transistors MOS devices

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Energy-Efficient Connectivity Re-establishment in WSN in the Presence of Dumb Nodes

Energy-Efficient Connectivity Re-establishment in WSN in the...

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International Conference on Communication Workshop

作者： Pushpendu Kar Arijit Roy Sudip Misra Mohammad S. Obaidat School of Information Technology Indian Institute of Technology Kharagpur Kharagpur India Dept. of Computer Science and Software Engineering Monmouth University NJ USA

In this work, we propose a scheme, named LECRAD, for the re-construction of temporarily lost connectivity in the presence of dumb nodes in stationary wireless sensor networks. A sensor node is termed as "dumb", when it continues its physical sensing, but fails to communicate due to shrinkage in communication range, typically attributed to adverse environmental effects such as rainfall, fog and high temperature. On the resumption of favorable environmental conditions, the node starts to behave normally. So, dumb behavior is dynamic in nature. Such behavior of a node leads to network partitioning and node isolation, which results in disruption of connected topology. Therefore, the proposed scheme in this paper reconstructs the lost connectivities between nodes by activating intermediate sleep nodes or by adjusting the communication range of the sensor nodes, while there is no neighbor node within the reduced communication range. In the proposed scheme, a learning automata-based approach is used for activation of intermediate sleep nodes or adjustment of communication range of isolated or intermediate nodes to decrease the message overhead and energy consumption of the network. Simulation results show that the proposed scheme, LECRAD, exhibits better energy efficiency and message overhead than that of the recently proposed topology management protocols, LETC and Al, if they are applied in such scenario.

关键词： Dumb Node Environmental effect Connectivity re-establishment Learning automata

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A Web Service Composition Method Based on Compact K2-Trees

A Web Service Composition Method Based on Compact K2-Trees

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IEEE International Conference on Services Computing (SCC)

作者： Jing Li Yuhong Yan Daniel Lemire Dept. of Computer Science and Software Engineering Concordia University Montreal Canada LICEF Research Center TELUQ Universite du Quebec Montreal Canada

With the advent of cloud computing, a significant number of web services are available on the Internet. Services can be combined together when user's requirements are too complex to be solved by individual services. Since there are many services, searching a solution may require much storage. We propose to apply a compact data structure to represent the web service composition graph. To the best of our knowledge, our work is the first attempt to consider compact structure in solving the web service composition problem. Experimental results show that our method can find a valid solution to the composition problem, meanwhile, it takes less space and shows good scalability when handling a large number of web services.

关键词： Web services Indexes Quality of service Vegetation Data structures Planning Electronic mail

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From low-architectural expertise up to high-throughput non-binary LDPC decoders: Optimization guidelines using high-level synthesis

From low-architectural expertise up to high-throughput non-b...

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International Conference on Field Programmable Logic and Applications

作者： Joao Andrade Nithin George Kimon Karras David Novo Vitor Silva Paolo Ienne Gabriel Falcao Dept. Electrical and Computer Engineering University of Coimbra Portugal École Polytechnique Fédéralc de Lausanne School of Computer and Communication Sciences Lausanne Switzerland Xilinx Research Labs Dublin Ireland

HLS tools have been introduced with the promise of easening and shortening the design cycle of tedious and error-prone RTL-based development of hardware accelerators. However, they do so either by concealing meaningful hardware decisions which model the computing architecture-such as OpenCL compilers-or by abstracting them away into a high-level programming language-usually C-based. In this paper, we show that although Vivado HLS is sufficiently mature to generate a functionally correct FPGA accelerator from a naive description, reaching an accelerator which optimizes the FPGA resource utilization in a way that conveys maximum performance is a process for a hardware architect mindset. We use a highly demanding application, that requires real-time operation, and develop a non-binary LDPC decoder on a state-of-the-art Virtex 7 FPGA, using the Vivado HLS framework. Despite using the same programming syntax as a C-language software compiler, the underlying programming model is not the same, thus, the optimizations required in code refactoring are distinct. Moreover, directive-based optimizations that tweak the synthesized C description hardware must be used in order to attain efficient architectures. These processes are documented in this paper, to guide the reader on how an HLS-based accelerator can be designed, which in our case can come close to the performance achieved with dedicated hand-made RTL descriptions.

关键词： Decoding Optimization Parity check codes Field programmable gate arrays computer architecture Hardware Random access memory

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Configurable simulation environment to test the navigation estimator

Configurable simulation environment to test the navigation e...

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Integrated Communications, Navigation and Surveillance Conference, ICNS

作者： Petr Bojda Jan Leuchter Electrical Computer Software and System Engineering Dept. Embry-Riddle Aeronautical University Daytona Beach FL USA Department of Radar Technology University of Defense

• demonstrate the concept of simulations prepared for the new challenges which appear with a new type of operations in the airspace • based on the state space description of the dynamic system — the AV — and is designed to allow the control over a character of the system or measurement noise. • anticipated main factor — multipath effect. The multipath propagation may affects mainly the PDF of the measurement noise.

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A Testbed Using USRP(TM) and LabView(R) for Dynamic Spectrum Access in Cognitive Radio Networks

A Testbed Using USRP(TM) and LabView(R) for Dynamic Spectrum...

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International Conference on Advanced Information Networking and Applications (AINA)

作者： Nimish Sharma Danda B. Rawat Bhed B. Bista Sachin Shetty Department of Electrical Engineering Georgia Southern University USA Faculty of Software and Information Science Iwate Prefectural University JAPAN Dept. of Electrical and Computer Engineering Tennessee State University USA

Dynamic spectrum access is regarded as a backbone for cognitive radio networks where unlicensed secondary users (SUs) access spectrum opportunistically which is licensed to licensed primary users (PUs). SUs are required to identify the idle bands and use them dynamically without creating any harmful interference to PUs. In dynamic spectrum access for peer-to-peer based communications, SU transmitter and its intended SU receiver must use common channel to communicate. Note that the fixed common control channel could not be viable in case of jamming attacks and wideband regime. Thus in this paper, we present a test bed using Universal software Radio Peripheral (NI USRP) devices. We use Lab View® and MATLAB® scripting extensions to program NI USRP devices for peer-to-peer communications. Once SU transmitter and receiver pair knows idle channels, they use one of the best idle channels to communicate. We study sequential channel scanning and quorum based rendezvous methods without using any common control channels. These two schemes are compared in terms of their performance for finding suitable channel. Test bed is developed to test these schemes. Numerical results are presented obtained from test bed.

关键词： Conferences

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Amnesic cache management for non-volatile memory

Amnesic cache management for non-volatile memory

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IEEE/NASA Goddard Conference on Mass Storage Systems and Technologies, (MSST)

作者： Dongwoo Kang Seungjae Baek Jongmoo Choi Donghee Lee Sam H. Noh Onur Mutlu Dept. of Software Dankook University South Korea School of Computer Science University of Seoul South Korea School of Comp. & Info. Eng. Hongik University South Korea Dept. of Electrical and Computer Engineering Carnegie Mellon University USA

One characteristic of non-volatile memory (NVM) is that, even though it supports non-volatility, its retention capability is limited. To handle this issue, previous studies have focused on refreshing or advanced error correction code (ECC). In this paper, we take a different approach that makes use of the limited retention capability to our advantage. Specifically, we employ NVM as a file cache and devise a new scheme called amnesic cache management (ACM). The scheme is motivated by our observation that most data in a cache are evicted within a short time period after they have been entered into the cache, implying that they can be written with the relaxed retention capability. This retention relaxation can enhance the overall cache performance in terms of latency and energy since the data retention capability is proportional to the write latency. In addition, to prevent the retention relaxation from degrading the hit ratio, we estimate the future reference intervals based on the inter-reference gap (IRG) model and manage data adaptively. Experimental results with real-world workloads show that our scheme can reduce write latency by up to 40% (30% on average) and save energy consumption by up to 49% (37% on average) compared with the conventional LRU based cache management scheme.

关键词： Nonvolatile memory Phase change materials Resistance Random access memory Ash Writing Electronic mail

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Improving the OVO performance in fuzzy rule-based classification systems by the genetic learning of the granularity level

Improving the OVO performance in fuzzy rule-based classifica...

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IEEE International Conference on Fuzzy Systems

作者： Pedro Villar Alberto Fernández Rosana Montes Ana María Sánchez Francisco Herrera Department of Software Engineering University of Granada Granada Spain Dept. of Computer Science University of Jaén Jaén Spain Department of Computer Science & Artificial Intelligence University of Granada Granada Spain

ISBN: (纸本)9781467374293

This contribution proposes a genetic learning process for designing the knowledge base of Fuzzy Rule-Based classification Systems, that will be used as binary classifiers in a One-vs-One decomposition for multi-class problems. A Genetic Algorithm is designed to adapt the number of fuzzy labels per variable (granularity level) for each classifier in order to improve the accuracy rate of a multi-class classifier. The genetic learning process evolves granularity levels and needs a fuzzy rules generation method for generating the whole knowledge base of the Fuzzy System. Several data-sets from KEEL data-set repository are used in the experimental study and we compare our proposal with three related methods: the standard way to design Fuzzy Rule-Based Classification Systems using the fuzzy rules generation method chosen with and without One-vs-One decomposition, and our proposal of genetic granularity level learning without One-vs-One decomposition.

关键词： OVO performance fuzzy rule-based classification systems genetic learning Fuzzy rules Fuzzy fuzzy rule-based system Knowledge Bases multi-class accuracy rate Learning processes Classifiers binary sorter Taxonomy Fuzzy systems

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AID: A Prototype for Agricultural Intrusion Detection Using Wireless Sensor Network

AID: A Prototype for Agricultural Intrusion Detection Using ...

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IEEE International Conference on Communications

作者： Sanku Kumar Roy Arijit Roy Sudip Misra Narendra. S. Raghuwanshi Mohammad S. Obaidat School of Information Technology IIT Kharagpur Kharagpur India Agricultural and Food Engineering Department IIT Kharagpur Kharagpur India Dept. of Computer Science and Software Engineering Monmouth University NJ USA

In many developing countries, agriculture is one of the primary livelihoods of common people. Agriculture requires various types of technologies for improving crop yields. The attack of animals in the agricultural land and the theft of crops by humans cause heavy loss in cultivation. In this work, we propose a hardware prototype using Wireless Sensor Network (WSN) for intruder detection in an agricultural field. The proposed system is named Agricultural Intrusion Detection (AID). AID helps to generate alarms in the farmer's house and at the same time transmits a text message to the farmer's cell phone when an intruder enters into the field. In order to implement the proposed scheme, we design and deploy Advanced Virtual RISC (AVR) micro-controller-based wireless sensor boards over an outdoor environment and evaluate the performance.

关键词： Wireless sensor networks Agriculture Prototypes Monitoring Wireless communication Acoustics Intrusion detection

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