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检索条件"任意字段=Digital Human Modeling for Design and Engineering Symposium"

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digital compressor structure in neural network implementation using complex complementary pass-transistor logic (C/sup 2/PL)

Digital compressor structure in neural network implementatio...

引用

Midwest symposium on Circuits and Systems (MWSCAS)

作者： D. Zhang M. Kamel M.I. Elmasry VLSI Research Group Department of Electrical & Computer Engineering University of Waterloo Waterloo ONT Canada Pattern Analysis & Machine Intelligence Systems Design Engineering University of Waterloo Waterloo ONT Canada

In this paper, a compressor structure based on complex complementary pass-transistor logic (C/sup 2/PL) is presented. Some types of 3-2 compressors in C/sup 2/PL are achieved and a number of experiments are conducted to optimize their performance. Two typical compressor building blocks, the 4-2 compressor and 7-3 compressor, are built and their digital neural network (DNN) applications are discussed. Compared with the complementary pass-transistor logic (CDL) designs, our simulations show that the C/sup 2/PL compressor has the best performances in power, delay and number of transistors.

关键词： Intelligent networks Neural networks CMOS logic circuits Logic design Switches Semiconductor device modeling design engineering Neurons CMOS technology Voltage

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A quantitative, probabilistic approach to human-rating of space systems

A quantitative, probabilistic approach to human-rating of sp...

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Annual symposium on Reliability and Maintainability (RAMS)

作者： P. Rutledge B. Buchbinder NASA Headquarters WA USA

This paper presents the quantitative, probabilistic approach to human rating proposed by the authors, together with the current status of this issue at NASA. The authors suggest that decisions on human rating must be made based on the probability of crew survival. The probability of crew survival, in turn, is calculated by applying probabilistic risk modeling to the space system. Not only does this yield the desired quantification for use by the decision-maker, but it results in a dynamic tool for use throughout the system life cycle to identify and focus available risk reduction resources on the system's primary risk drivers. In conclusion, while human rating can be achieved by the application of classical engineering design techniques including redundancy, fault tolerance, and safety margins, it can be measured only in terms of the probability of crew survival. This ability to measure crew survival probability through probabilistic risk assessment (PRA) methods provides the framework for: 1) trade studies by which to optimize crew survival among the many competing system design variables, and 2) the most resource-efficient application of the classical engineering design techniques to achieve crew survival goals.< >

关键词： humans Space vehicles NASA Risk management Probability design engineering Redundancy Reliability Vehicle dynamics Fault tolerance

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Hierarchical statistical verification of large full custom CMOS circuits

Hierarchical statistical verification of large full custom C...

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IEEE International symposium on Circuits and Systems (ISCAS)

作者： A.B. van der Wal R.G.J. Arendsen O.E. Herrmann A.C. Brombacher Department of Electrical Engineering Laboratory for Networktheory University of Twente Enschede Netherlands Quality Engineering Department Philips Consumer Electronics Company Eindhoven Netherlands

This paper presents a methodology to incorporate hierarchy in the design verification process of large full custom digital CMOS circuits including the effects of statistical process variation and variation in external parameters like temperature and supply voltage. Behavioural models are used to describe sub-circuits on a high level of abstraction. Statistical tolerance information from the circuit level is mapped onto the behavioural models. By means of a case study on a large full custom design we show that this design verification methodology can be very efficient.< >

关键词： Circuit simulation Silicon Semiconductor device modeling Switches design methodology Voltage Application specific integrated circuits Buildings Switching circuits Timing

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Simulation and performance evaluation of a parallel architecture for signal processing

Simulation and performance evaluation of a parallel architec...

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Southeastern symposium on System Theory

作者： S. Howard W. Alexander Electrical and Computer Engineering North Carolina State University Raleigh NC USA

The authors have developed a conceptual design for a multiprocessor system to implement multidimensional digital signal processing applications. Their approach is to develop an application specific computing system instead of a specific hardware solution. The application specific computing system can be used as a research tool for exploring new approaches to problems. In addition, it can be used to achieve high performance at reasonable costs since it can use commercially available processors. They present a performance evaluation of our system using the 2-D FIR filter as an example. They explain their approach to implementing the 2-D FIR filter by first reviewing their previous implementation of the 2-D IIR filter.< >

关键词： Parallel architectures Computer applications Finite impulse response filter Computational modeling Signal design Multiprocessing systems Multidimensional signal processing digital signal processing Hardware Costs

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A multilayer feedforward neural network model for digital hardware implementation

A multilayer feedforward neural network model for digital ha...

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IEEE International symposium on Circuits and Systems (ISCAS)

作者： H.K. Kwan C.Z. Tang Department of Electrical Engineering University of Windsor Windsor ONT Canada

A design algorithm for two-layer feedforward neural networks (2FNNs) for discrete input-output mapping is proposed. In this algorithm, uniformly quantized discrete weights are used, which could be in the form of either one-powers-of-two (OPOT) values or sum-of-powers-of-two (SPOT) values. The simplified sigmoid activation functions (SSAFs) are used at hidden neurons and the step functions are used at output neurons to further reduce the hardware implementation cost. Simulation results indicate that such networks can retain nearly identical recall performances as those of the corresponding networks using continuous weights and sigmoid activation functions (SAFs), while having increased computational speed in applications and reduced cost in digital hardware implementation.< >

关键词： Multi-layer neural network Neural networks Feedforward neural networks Neural network hardware Neurons Cost function Algorithm design and analysis Computational modeling Computer applications Computer networks

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Computer-aided development of mechatronic systems

Computer-aided development of mechatronic systems

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IEEE International symposium on Computer Aided Control System design (CACSD)

作者： U. Lefarth Machalronic Laboratory Paderborn University of Paderborn Paderborn Germany

As a rule, modern technical systems consist of components from different disciplines (mechanics, electrical engineering, electro-magnetics, hydraulics, etc.). Typical examples are the so-called mechatronic systems. These are systems whose basic structure is usually a mechanical one with mostly higher transmission bandwidth and which are completed by actuators and sensors for a better statical and dynamical behaviour. Their special efficiency is due to a combination with information-processing systems; these are usually digital control elements. The considerable complexity of systems of this kind requires systematization of the design process, as regards model generation, system analysis and synthesis. This, however, is indissolubly linked to software support covering the entire design cycle. This is the starting point for my contribution which will present a uniform system description language for various technical disciplines. It is the basis of a graphics-oriented, interactive design environment for developing and realizing mechatronic systems which will be exemplified in detail by their modelling and nonlinear simulation.< >

关键词： Mechatronics Actuators Sensor systems Computational modeling Mathematical model Computer simulation Bandwidth Mechanical sensors Process design Control system synthesis

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Ordered ternary decision diagrams and the multivalued compiled simulation of unmapped logic

Ordered ternary decision diagrams and the multivalued compil...

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Annual symposium on Simulation

作者： G. Jennings J. Isaksson P. Lindgren Division of Computer Engineering Luleå Institute of Technology Lulea Sweden

We describe a method for generating logic simulation code which correctly responds to any number of undefined logic values at the code inputs. The method is based on our development of the ordered ternary decision diagram, itself based on Kleenean ternary logic, which explicitly and correctly manages the unknown logic value 'U' in addition to the '1' and '0' of conventional OBDDs. We describe the OTDD and how to implement its reduction, application, and restriction operations. This method avoids expensive technology mapping, producing highly efficient 'U'-correct compiled logic simulation code in seconds rather than in hours. Our experiments toward confirming the validity of the method are reported.< >

关键词： Multivalued logic Logic testing Computational modeling Logic design Circuit simulation Discrete event simulation Computer simulation design methodology digital systems Voltage

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A framework for building cell libraries with novel devices

A framework for building cell libraries with novel devices

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Midwest symposium on Circuits and Systems (MWSCAS)

作者： M. Rehani S.U. Rahman G. Singh Digital Architecture Laboratory Electrical and Computer Engineering Wayne State University Detroit MI USA

The decade of the nineties has witnessed a rapid growth in device technologies. Emerging devices can provide higher packaging density through vertical packing of lowered feature sizes, as well as allow fabrication using experimental materials with sub-threshold switching, opto-electronic, and superconducting properties. A lack of suitable simulation framework at the circuit level impedes the progress in rapidly developing circuit level models for putative applications. Circuit realization and simulation using commonly available suites of EDA tools is therefore desirable for the advancement of research in novel devices. A technique for overcoming this limitation using the currently available IC design tools is outlined in this paper. A "component library" consisting of primitive cells is developed and used for the automated development of higher level optimized cells. The higher level cells are generated using automated place and route tools and subsequently annotated with the pin delays obtained from the SPICE simulation. The optimized high level cells can be used in designing higher level systems and also be used in functional and timing verification on a digital simulation kernel. The only pre-requisite to the outlined approach is the existence of the SPICE models for devices that can allow modeling annotation of delays on the pins of the standard cells.

关键词： Libraries Superconducting materials Circuit simulation Delay SPICE Packaging Fabrication Impedance Electronic design automation and methodology design optimization

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Fuzzy inference systems by genetic algorithm and factor analysis modeling for multivariate complex systems

Fuzzy inference systems by genetic algorithm and factor anal...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： A. Itagaki M. Takashima Y. Ashino C. Nishio S. Nakanishi Japan Knowledge Industry Company Limited Shinagawa Tokyo Japan Graduate School of System Management University of Tsukuba Tokyo Japan Department of Electrical Engineering Tokai University Hiratsuka Kanagawa Japan

The authors propose a system which can automatically learn causal relation for multivariate complex problems by use of fuzzy inference and genetic algorithm. It has been difficult to infer the correct results from a lot of input variables by using only the fuzzy inference. We first concentrate many variables into a few variables of the input of fuzzy inference by factor analysis. Secondly, the genetic algorithm and delta rule are used to adjust and learn the fuzzy inference rules. We apply this system to human behavioral system with many input variables. By this causal modeling, we can identify the complex human system more precisely than the regression analysis generally used.< >

关键词： Fuzzy systems Genetic algorithms Algorithm design and analysis Regression analysis Input variables humans Statistical analysis Fuzzy neural networks Information analysis Data mining

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ASSESSMENT OF LOW-CONTRAST DETECTABILITY FOR COMPRESSED digital CHEST IMAGES

ASSESSMENT OF LOW-CONTRAST DETECTABILITY FOR COMPRESSED DIGI...

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Conference on Image Perception: Medical Imaging 1994

作者： COOK, LT INSANA, MF MCFADDEN, MA HALL, TJ COX, GG UNIV KANSAS MED CTRDEPT DIAGNOST RADIOLKANSAS CITYKS 66160

ISBN: (纸本)0819414611

The ability of human observers to detect low-contrast targets in screen-film (SF) images, computed radiographic (CR) images, and compressed CR images was measured using contrast detail (CD) analysis. The results of these studies were used to design a two- alternative forced-choice (2AFC) experiment to investigate the detectability of nodules in adult chest radiographs. CD curves for a common screen-film system were compared with CR images compressed up to 125:1. Data from clinical chest exams were used to define a CD region of clinical interest that sufficiently challenged the observer. From that data, simulated lesions were introduced into 100 normal CR chest films, and forced-choice observer performance studies were performed. CR images were compressed using a full-frame discrete cosine transform (FDCT) technique, where the 2D Fourier space was divided into four areas of different quantization depending on the cumulative power spectrum (energy) of each image. The characteristic curve of the CR images was adjusted so that optical densities matched those of the SF system. The CD curves for SF and uncompressed CR systems were statistically equivalent. The slope of the CD curve for each was - 1.0 as predicted by the Rose model. There was a significant degradation in detection found for CR images compressed to 125:1. Furthermore, contrast-detail analysis demonstrated that many pulmonary nodules encountered in clinical practice are significantly above the average observer threshold for detection. We designed a 2AFC observer study using simulated 1-cm lesions introduced into normal CR chest radiographs. Detectability was reduced for all compressed CR radiographs.

关键词： Image compression Chromium Chest Target detection Chest imaging Critical dimension metrology Signal to noise ratio Visualization Absorbance Data modeling

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