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检索条件"任意字段=International Conference on Embedded Computer Systems Architectures Modeling and Simulation"

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Optimal placement and sizing of FACTS device to overcome contingencies in power systems

Optimal placement and sizing of FACTS device to overcome con...

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international conference on Signal Processing, Communication, Power and embedded System (SCOPES)

作者： Mohammad Rafee Shaik A. Srinivasula Reddy Department of Electrical and Computer Engineering JigJiga University Jigjiga Ethiopia CMR Engineering College Hyderabad Telangana India

ISBN: (纸本)9781509046218

Inpower systems because of uncertainty of the load curve and transfer of power between various utilities and loads block out situations will be created. In these situations the Flexible AC transmission system (FACTS) controllers play an important role in power system security enhancement. As the capital cost of these controllers is high, these controllers must be placed optimally. FACTS devices can regulate the active and reactive power control as well as adaptive to voltage-magnitude control simultaneously because of their flexibility and fast control characteristics. Placement of these devices at optimal location can lead to control in line flow and maintain bus voltages at required level and so improve the voltage profile, to improve load transfer capability, decreasing the losses in the system and operate the system within stable regions. This paper proposes a systematic method for finding optimal location of SVC to improve voltage profile of a power system under normal conditions and under contingency conditions with Artificial Bee Colony (ABC) Algorithm. An OPF with/without SVC using ABC algorithm is considered for healthy conditions and also for contingency conditions in simulation and compared with existing literature. Effectiveness of the proposed method is demonstrated on IEEE 30-bus test system.

关键词： Static VAr compensators Power system stability Voltage control Flexible AC transmission systems Signal processing algorithms Load modeling Reactive power

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A study on transmitting MPEG-I video over a FDDI network

A study on transmitting MPEG-I video over a FDDI network

引用

IEEE international conference on embedded and Real-Time Computing systems and Applications (RTCSA)

作者： J.K.-Y. Ng Computing Studies Department Hong Kong Baptist University Hong Kong China

This paper presents two schemes to improve the transmission of real-time MPEG-I video over a FDDI network. Multiple classes of MPEG-I video will be used in the study and what makes this simulation study different from the others is the different kinds of MPEG-I video data we used. These data are captured from real video programmes and we categorized these video clips according to their workload characteristics. The performance of the FDDI network is examined in terms of the maximum number of MPEG-I video streams got transmitted over the network without missing their deadlines. This simulation study observed that by employing the Intentional-delay scheme, we can improve the performance by an average of 35%. From another set of simulation experiment, when applying the Frame-grouping scheme for MPEG-I transmission, we can improve the performance up to 150%.

关键词： FDDI Video compression Streaming media Computational modeling Transform coding computer networks Bit rate MPEG standards Protocols Channel allocation

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Tele-autonomous systems: Methods and architectures for intermingling autonomous and telerobotic technology

Tele-autonomous systems: Methods and architectures for inter...

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IEEE international conference on Robotics and Automation (ICRA)

作者： L. Conway R. Volz M. Walker Robotics Research Laboratory Department of Electrical Engineering and Computer Science University of Michigan Michigan

As a result of recent advances in artificial intelligence, human cognitive modelling, autonomous systems and telerobotics, there is an opportunity to broaden our concepts of technology for projecting action at a distance. We draw on these advances to develop a conceptual and architectural framework that enables efficient projection in time and space of intermingled manipulation and cognition tasks. Where AI-based autonomous systems have previously been concerned with human supervisory intervention primarily at a cognitive level, we add methods for rendezvous, capture and rehandoff of embedded manipulation tasks. Where telerobotics has been concerned with the projection of sensory-motor manipulation, we add the projection of cognitive processing. Thus extended, the two technologies mirror one another and merge into one of "tele-autonomous systems". We introduce notions of how the sensory, cognitive and motor functions of tele-autonomous systems can be factored and transferred back and forth between human and machine. We illustrate how the times to complete tele-autonomous tasks can be reduced through time and space constraint relaxations effected through simple controls: We employ the concepts of forward simulation and predictor display, augmented by "time and position clutches", "time ratio controls" and "time brakes", to control the resulting manipulation paths and event transitions. We sketch some generic architectural and human interface implications of these methods. Finally, we describe our environment for exploring these methods and the results of some recent experiments.

关键词： Telerobotics Humans Space technology Artificial intelligence Cognition Mirrors Time factors Predictive models Discrete event simulation Displays

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Multirate Kalman filtering approach for optimal two-dimensional signal reconstruction from noisy subband systems

Multirate Kalman filtering approach for optimal two-dimensio...

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IEEE international conference on Image Processing

作者： J.Q. Ni K.L. Ho K.W. Tse J.S. Ni M.H. Shen Department of Electrical and Electronic Engineering University of Hong Kong Hong Kong China Wuhan University of Hydraulic and Electrical Engineering Wuhan China

Conventional synthesis filters in subband systems lose their optimality when additive noise due, for example, to signal quantization, disturbs the subband components. The multichannel representation of the subband signal is combined with the statistical model of the input signal to derive the multirate state-space model for a filter bank system with additive noise. Thus the signal reconstruction problem in the subband system can be formulated as the process of optimal state estimation in the equivalent multirate state-space model. With the input signal embedded in the state vector, the multirate Kalman filtering provides the minimum-variance reconstruction of the input signal. Using the powerful Kronecker product notation, the results and derivations can then be extended to the 2-D cases. Incorporated with the vector dynamical model, the 2-D multirate state-space model for 2-D Kalman filtering is developed. computer simulation with the proposed 2-D multirate Kalman filter gives favorable results.

关键词： Kalman filters Filtering Filter bank Additive noise Signal synthesis Quantization Signal reconstruction State estimation Power system modeling computer simulation

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Bandwidth reservation for real-time traffic in wireless mobile environment

Bandwidth reservation for real-time traffic in wireless mobi...

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IEEE international conference on embedded and Real-Time Computing systems and Applications (RTCSA)

作者： Byung Kyu Choi R. Bettati Department of Computer Science Texas A and M University College Station TX USA

This paper proposes a new bandwidth reservation strategy (Two Level Guarantee) in wireless environment based on the user mobility specification which is assumed to be given at call set up time. This approach is very useful in that 1) it doesn't use prediction method which might require rather heavy computation, 2) it reserves wireless bandwidth as much as the user requests, 3) it is flexible to control the new call blocking rates and handoff dropping rates with the number of EG (Exclusive Guarantee)s and PG (Pseudo Guarantee)s and threshold values. simulation results based on random walk model, with dynamic traffic and operating conditions show that a TLG system can admit new calls roughly three times larger than the APR (All Path Reservation) system, and can have roughly 2.5 times larger naturally terminated calls than the APR system.

关键词： Bandwidth Prediction methods Probability computer science Computational modeling Traffic control History Channel allocation

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Design and Implementation of Green Internet of Things in Container-Based Multi-Loop Aquaponics System

Design and Implementation of Green Internet of Things in Con...

引用

IEEE international Smart Cities conference (ISC2)

作者： Andrew Keong Ng Jing Zhi Chin R Mahkeswaran Chris Toh Singapore Institute of Technology Singapore Metro Farm Pte Ltd Singapore

ISBN: (数字)9798350364316

ISBN: (纸本)9798350364323

To strengthen food security, initiatives, such as adapting Internet of Things (IoT) technology, are often proposed to augment food production and quality. While farm operators can remotely and wirelessly monitor and control their farm systems and operations with IoT technology, conventional IoT infrastructure lacks energy-saving strategies, thereby increasing energy consumption and cost. This paper aims to design and implement a green IoT infrastructure in a containerbased multi-loop aquaponics system (CMAS). modeling and simulation of IoT architectures with and without sensor placement optimization and sampling interval optimization were conducted. simulation results reveal a considerable energy saving of up to $\mathbf{4 2. 1 \%}$ for a green IoT architecture with optimal sensor placement and a 30 -second sampling interval between IoT devices in a CMAS.

关键词： Energy consumption Sensor placement Food manufacturing simulation Green products Energy conservation Food security computer architecture Internet of Things Optimization

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On the Scope of Hardware Acceleration of Reconfigurable Processors in Mobile Devices

On the Scope of Hardware Acceleration of Reconfigurable Proc...

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Annual Hawaii international conference on System Sciences (HICSS)

作者： S. Gatzka C. Hochberger Chair for Embedded Systems Dresden Germany

Reconfigurable devices like Configurable systems on a Chip (CSoCs) have the ability to exchange parts of hardware during runtime. Multimedia applications often require computing power and often can be accelerated by specific hardware circuits. In this contribution we present the effect of hardware acceleration in reconfigurable devices. We introduce a new model of adaptive processors and describe its basic principle of operation. The model allows runtime variations of the type and number of functional units (including application specific FUs) as well as variations of the communication structure. Then, we discuss our multimedia kernel Inverse Discrete Cosine Transformation (IDCT) and the ability of shifting different parts of the IDCT into hardware. simulation results show that hardware acceleration of multimedia operations in an adaptive processor leads to significant performance gains and therefore reduces energy consumption.

关键词： Hardware Acceleration Runtime Multimedia computing computer applications Circuits Power system modeling Kernel Performance gain Energy consumption

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Autonomic trust prediction for pervasive systems

Autonomic trust prediction for pervasive systems

引用

international conference on Advanced Information Networking and Applications (AINA)

作者： L. Capra M. Musolesi Department of Computer Science University College London London UK

In recent years, various trust management models based on the human notion of trust have been proposed to support trust-aware decision making in pervasive systems. However, the degree of subjectivity embedded in human trust often clashes with the requirements imposed by the target scenario: on one hand, pervasive computing calls for autonomic and light-weight systems that impose minimum burden on the user of the device (and on the device itself); on the other hand, computational models of human trust seem to demand a large amount of user input and physical resources. The result is often a computational trust model that does not 'compute': either the degree of subjectivity it offers is limited, or its complexity compromises its usability. In this paper, we present an accurate and efficient trust prediction model that is based on a basic Kalman filter. We discuss simulation results to demonstrate that the predictor is capable of capturing the natural disposition to trust of the user of the device, while being autonomic and light-weight.

关键词： Humans Predictive models Pervasive computing Computational modeling Equations Usability Face computer science Educational institutions Decision making

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A rule-based model of computation for SystemC: integrating SystemC and Bluespec for co-design

A rule-based model of computation for SystemC: integrating S...

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ACM and IEEE international conference on Formal Methods and Models for Co-Design (MEMOCODE)

作者： H.D. Patel S.K. Shukla E. Mednick R.S. Nikhil Bradley Department of Electrical and Computer Engineering Virginia Technology Blacksburg VA USA Bluespec Waltham MA USA

Bluespec's rule-based model of computation (MoC) for hardware concurrency has gained attention for several reasons. From its basis in term rewriting systems, rules have the property of atomicity, which improves correctness by construction, particularly in large-scale concurrency with finegrained, dynamic resource sharing (typical in complex hardware). Rule-based interface methods extend atomicity across module boundaries, have a natural transactional reading, and precisely and formally characterize resource-sharing constraints. All this can be synthesized to hardware with competitive quality. SystemC expresses concurrency with threading and events, just like RTL, where it is difficult to deal with fine-grain concurrency and resource sharing. Further, there is no systematic methodology for module composition. Thus, while SystemC is suitable for very coarse modeling and for embedded software development, its limitations make it difficult to model correct by construction hardware systems accurately. In this paper, we show how to integrate Bluespec's rule-based MoC into SystemC. We augment SystemC modules with rules and rule-based interface methods, and augment the SystemC simulation kernel with a rule execution kernel. The integration is augmentative in that a model can contain both rule-based modules (where hardware accuracy is desired) as well as core SystemC or TLM modules (for embedded software, instruction-set simulators, existing SystemC IP, or pure behavioral models), thus providing the advantages of each MoC where appropriate

关键词： Computational modeling Object oriented modeling Concurrent computing Resource management embedded software Kernel Hardware design languages Productivity Floors Large-scale systems

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Energy based path planning for a novel cabled robotic system

Energy based path planning for a novel cabled robotic system

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2008 IEEE/RSJ international conference on Intelligent Robots and systems

作者： Per Henrik Borgstrom Amarjeet Singh Brett L. Jordan Gaurav S. Sukhatme Maxim A. Batalin William J. Kaiser Department of Electrical Engineering University of California Los Angeles USA Department of Mechanical Engineering University of California Los Angeles USA Department of Computer Science University of Southern California USA Center for Embedded Networked Sensing University of California Los Angeles USA

ISBN: (纸本)9781424420575

Cabled robotic systems have been used for a diverse set of applications such as environmental sensing, search and rescue, sports and entertainment and air vehicle simulators. In this paper, we introduce a new cabled robot- Networked Info Mechanical System for Planar actuation (NIMS-PL), with energy profiling capabilities. Accurate energy measurements supported by NIMS-PL enable path planning that optimizes the robotpsilas path subject to an upper bound on energy consumption. We performed extensive empirical validation of the optimized path planning approach in simulation using an environmental sensing application as an example. We also validated the simulation results using NIMS-PL, demonstrating significant improvements in the sensing task when accounting with accurate energy measurements as opposed to Euclidean distance, which is typically used for modeling energy spent in path traversal.

关键词： Robot sensing systems Sensors Robots Path planning Actuators Distance measurement Brushless motors

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