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A virtual prototyping toolkit for assessment of child restraint system (CRS) safety

A virtual prototyping toolkit for assessment of child restra...

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2004 SAE World Congress

作者： Hulme, K.F. Patra, A. Vusirikala, N. Galganski, R.A. Hatziprokopiou, I. University at Buffalo United States General Dynamics Advanced Information Engineering Services 4455 Genesee Street Buffalo NY 14225 United States Mechanical and Aerospace Engineering 605 Furnas Hall University at Buffalo United States Mechanical and Aerospace Engineering 804 Furnas Hall University at Buffalo United States

ISBN: (纸本)0768013194

Computational modeling continues to play an increasingly significant role in the design of more effective vehicle crash safety systems. Models configured with sophisticated computer analyses permit researchers to perform extensive "what-if?" exploratory studies at a fraction of the cost and time that would be required by physical testing alone. Presently, our research team is developing a modeling and analysis capability that will provide child restraint system (CRS) engineers, designers, and analysts a validation tool that will supplement conventional engineering results attained from sled testing, which is often timely and costly. Supplementing these physical tests and digital modeling capabilities is the newly developed NYSCEDII CRS Visualization Module (NCVM), which allows a user to immersively visualize the MADYMO-calculated automotive crash simulation imagery. Depicted are the motion of, and interactions between, the CRS shell, human "dummy", harness and latch belt assemblies, and applicable vehicle cabin-interior surfaces and structure;and nodal finite element Von Mises color stress contours for the CRS shell and its attendant restraint straps. Supplemental NCVM features include: plotted instantaneous body segment acceleration-time responses;dummy displacements visually tracked using on-screen reference markers - to be tracked as a function of time;forwards or backwards animation capability;and stereo viewing, using anaglyphic stereo, to convey a sense of depth and immersion. This paper demonstrates the utility of the NCVM using a combination conventional/finite element system model of a recent-production child restraint system (CRS) and its three-year-old dummy occupant in a modified FMVSS 213 sled test environment. Copyright © 2004 SAE International.

关键词： Accidents

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An adaptive impedance matching system and considerations for a better performance

An adaptive impedance matching system and considerations for...

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2004 Joint Conference of the 10th Asia-Pacific Conference on Communications and the 5th International symposium on Multi-Dimensional Mobile Communications Proceedings, APCC/MDMC'04

作者： Ida, Ichirou Takada, Jun-Ichi Toda, Takeshi Oishi, Yasuyuki Dept. of International Development Engineering Tokyo Institute of Technology Tokyo 152-8552 Japan Fujitsu Limited Yokosuka 239-0847 Japan

ISBN: (纸本)0780386019

An adaptive antenna impedance matching system for mobile communication terminals is proposed. The system adaptively controls two varactors of the pi-network matching circuit detecting the change in the refection coefficient between the antenna combined with the matching circuit and the RF front end of a transceiver. This system consists mainly of analog circuits and employs only a simple algorithm for convergence, therefore does not need any complicated mathematical formulation for modeling of the system itself as well as its nonlinear control elements. Also the proposed system utilizes only simple digital circuits for timing generation. In this paper, the performance of the adaptive impedance matching system is investigated by simulation. The input impedance of the antenna is alternated assuming the change of the environment due to a human head or a hand, and etc. In addition, a better performance is obtained in terms of the input power to the antenna by holding the adaptive control when the reflection is smaller than a certain threshold value. As a result, it is found that the input power to the antenna for transmission can be increased by about 2dB per second compared with a fixed capacitance matching system. © 2004 IEEE.

关键词： Adaptive control systems

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Interesting applications of Atmel AVR microcontrollers

Interesting applications of Atmel AVR microcontrollers

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Euromicro symposium on digital System design

作者： S. Korbel V. Janes Department of Computer Science and Engineering Czech Technical University Prague Czech Republic

The paper describes a design of a microcode-controlled state machine and its software implementation in the Atmel AVR microcontrollers. In particular, the microcontrollers ATmegal03 and ATmegal28 are used. This design is closely related to a software implementation of a simulator in AVR microcontrollers. This simulator communicates with the designed state machine and presents a complete design environment for microcode development and debugging. Both of these devices can be interconnected by a flat cable and linked to a computer through a serial or USB interface. Both devices share the control software that allows us to create and edit microprograms and to control the whole state machine. It is possible to start, cancel or step through the execution of microprograms. The operator can observe the current state of the state machine, too. The second part of the control software enables the operator to create and compile simulating programs. The control software communicates with both devices using commands. All the results of this communication are well arranged in dialog boxes and windows.

关键词： Microcontrollers Application software Computational modeling Registers Debugging Computer interfaces Universal Serial Bus Communication system control Computer science design engineering

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An energy-efficient adaptive multiple-issue architecture

An energy-efficient adaptive multiple-issue architecture

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Euromicro symposium on digital System design

作者： M. Lan M. Biglari-Abhari Department of Electrical and Computer Engineering University of Auckland Auckland New Zealand

Energy-efficient and low-power designs issues are becoming more important in modern processors. In this paper we propose an energy-efficient adaptive multiple-issue architecture for portable systems. The architecture utilizes a hardware-software cooperation approach to minimize hardware overhead while providing control flexibilities to programs and operating systems. Optimizations are made based on the program execution profile. Simulation results show that the adaptive architecture improves the performance by an average 20% with a maximum 8% reduction in energy consumption compared with the baseline model. The increase in power dissipation is restricted to less than 6%.

关键词： Energy efficiency Computer architecture Power dissipation Dynamic voltage scaling Pipelines Hardware Energy consumption Power system modeling Mars Control systems

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Mapping of high-level SDL models to efficient implementations for TinyOS

Mapping of high-level SDL models to efficient implementation...

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Euromicro symposium on digital System design

作者： D. Dietterle J. Ryman K. Dombrowski R. Kraemer IHP Frankfurt Germany

Wireless sensor networks have attracted much research effort in the past five years. With TinyOS, there exists a widely used, microthreaded operating system targeted for single processor sensor nodes. It requires only minimal processing and memory resources. Many research activities in the wireless sensor area focus on the design of efficient protocols in the MAC and network layer. SDL - a high-abstraction level formal description language - has long been used for modeling, simulation, and verification of communication protocols. In this paper, we present a mapping approach and optimizations to derive efficient component-based event-driven TinyOS applications from SDL models. We show, how the basic SDL concepts are reflected in the TinyOS component architecture.

关键词： Operating systems Wireless sensor networks Sensor systems Media Access Protocol Hardware Wireless application protocol Application software Component architectures design engineering Time to market

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Test vector generation and classification using FSM traversals

Test vector generation and classification using FSM traversa...

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IEEE International symposium on Circuits and Systems (ISCAS)

作者： R. Marczynski M.A. Thornton S.A. Szygenda Department of Computer Science and Engineering Southern Methodist University USA

design correctness has become a bottleneck in the modern digital system design cycle. In an effort to improve current ad hoc simulation processes, This work presents a method for the automated generation of simulation vectors using symbolic FSM traversal techniques. Generated vectors are classified into three categories, forward inter-frontier, reverse inter-frontier, and intra-frontier vectors; a classification based on a vector's ability to generate forward-, reverse-, and inter-frontier transitions in an FSM's state transition graph. Additionally, a state-element transition relation (S-ETR) is introduced. This technique involves the construction of a transition relation (TR) for each state holding element and defining a smaller, incomplete, over-approximation of the TR. Combining the information present in the S-ETRs coupled with simulation is used to perform image computations.

关键词： Computational modeling Circuit simulation State-space methods Discrete event simulation Computer science design engineering design methodology digital systems Circuit testing Data structures

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Arithmetic coding architecture for H.264/AVC CABAC compression system

Arithmetic coding architecture for H.264/AVC CABAC compressi...

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Euromicro symposium on digital System design

作者： R.R. Osorio J.D. Bruguera Department Electronic and Computer Engineering University of Santiago de Compostela Spain

In this paper we propose an efficient implementation of CABAC's binary arithmetic coder and context management system. CABAC is the context adaptive binary arithmetic coder used in new H.264/AVC video standard. Arithmetic coding allows a significant enhancement in compression. However, implementation complexity is a drawback due to hardware cost and slowness. In this paper we show the need for a hardware implementation of arithmetic coding in current video compression systems. We propose a fast and efficient implementation of the encoding algorithm. We prove that memory accesses constitute a bottleneck and propose solutions that apply to the encoding algorithm and context management system. As a result, a fast architecture is presented, able to process one symbol per cycle.

关键词： Arithmetic Automatic voltage control Video compression Context modeling Hardware Encoding Video coding IEC standards ISO standards Motion compensation

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modeling the acquisition front-end in high resolution gamma-ray imaging

Modeling the acquisition front-end in high resolution gamma-...

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IEEE symposium on Nuclear Science (NSS/MIC)

作者： P. Guerra J.E. Ortuno J.J. Vaquero G. Kontaxakis M. Desco A. Santos Electronic Engineering Department Universidad Politécnica Madrid Spain Hospital General Universitario Gregorio Maranón Madrid Spain

The availability of synthetic realistic data enables design optimization, algorithm evaluation and verification of any digital system where a significant amount of digital signal processing is performed. The evolution of positron emission tomography cameras towards continuous sampling of individual position-sensitive photomultiplier anodes with processing algorithms implemented on digital programmable logic devices creates a new framework where new approaches to the gamma-event detection are possible. We have developed a system model of the acquisition chain, including multi-layer phoswich, photomultiplier, front-end analog electronics, data acquisition and data processing. This processing includes estimation algorithms for the most relevant event parameters: energy, layer-of-interaction, time picking-off and event location. The selected simulation platform couples gently to digital hardware simulation tools, in such a way that implemented models may generate real-like stimuli for the digital system under development. The modeling of the whole front-end electronics enables deeper understanding and tuning of different system trade-offs and provides a rapid and soft transition between specification and hardware development

关键词： Image resolution Nuclear imaging Signal processing algorithms digital systems Photomultipliers Hardware Signal resolution Availability design optimization digital signal processing

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digital libraries and educational practice: a case for new models

Digital libraries and educational practice: a case for new m...

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IEEE/ACM Joint Conference on digital Libraries(JCDL)

作者： T. Sumner M. Marlino Department of Computer Science University of Colorado Boulder Boulder CO USA DLESE Program Center University Corporation of Atmospheric Research Boulder CO USA

Educational digital libraries can benefit from theoretical and methodological approaches that enable lessons learned from design and evaluation projects performed in one particular setting to be applied to other settings within the library network. Three promising advances in design theory are reviewed - reference tasks, design experiments, and design genres. Each approach advocates the creation of 'intermediate' constructs as vehicles for knowledge building and knowledge sharing across design and research projects. One purpose of an intermediate construct is to formulate finer-grained models that describe and explain the relationship between key design features and the cognitive and social dimensions of the context of use. Three models are proposed and used as thought experiments to analyze the utility of these approaches to educational digital library design and evaluation: digital libraries as cognitive tools, component repositories, and knowledge networks.

关键词： Software libraries Computer aided software engineering Educational technology Atmospheric modeling Buildings Computer science Performance evaluation Vehicles Context modeling human factors

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An efficient exponential algorithm with exponential convergence rate

An efficient exponential algorithm with exponential converge...

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Euromicro symposium on digital System design

作者： Chichyang Chen Kuo-Sheng Cheng Department of Information Engineering and Computer Science Feng Chia University FCU Taichung Taiwan

This paper presents an efficient additive normalization method for exponential computation. Same as a previous additive normalization method, this new method can allow the values of the normalization factors in the normalization method be obtained directly from the remaining terms without any computation. Furthermore, the convergence rate of this method is also exponential. Instead of generating a group of logarithmic terms in each normalization stage, only one logarithmic term with large radix is generated and used as the normalization factor. This technique facilitates the computation of the partial result term in each normalization stage. The computation can then be implemented efficiently as a simple multiplication-and-add operation. Thorough simulations on the 24-bit exponential unit have verified that our proposed method is correct. From the synthesis results, the hardware cost and the delay of the proposed 53-bit exponential unit are only one-fourth and two-thirds of those of the 53-bit exponential unit in the previous design, respectively. We conclude that our proposed additive normalization method can significantly improve the performance of the exponential computation.

关键词： Convergence Computer science Computational modeling Hardware Costs Delay Approximation error digital systems

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