In this paper, we propose an approach to synthesize the driving-point (DP) characteristic of a two-terminal, or one-port, device from the transfer characteristic (TC) of a two-port device, so that the resulting DP plo...
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In this paper, we propose an approach to synthesize the driving-point (DP) characteristic of a two-terminal, or one-port, device from the transfer characteristic (TC) of a two-port device, so that the resulting DP plot of the two-terminal device is exactly identical to the TC plot of the two-port device. A variety of synthesized characteristics are demonstrated.
A speckle imaging technique that relies upon variations in the local mechanical properties of tissue as the contrast mechanism, is described. The technique is called acoustically modulated speckle imaging (amSI). The ...
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ISBN:
(纸本)0791816400
A speckle imaging technique that relies upon variations in the local mechanical properties of tissue as the contrast mechanism, is described. The technique is called acoustically modulated speckle imaging (amSI). The technique is validated through experimental evaluation of samples of chicken skin and bovine muscle.
An eight-channel add-drop cross-grid vertically coupled microring resonator (VCMRR) filter is proposed and demonstrated. The cross grid comp.ises a grid-like array of buried channel waveguides which perpendicularly cr...
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An eight-channel add-drop cross-grid vertically coupled microring resonator (VCMRR) filter is proposed and demonstrated. The cross grid comp.ises a grid-like array of buried channel waveguides which perpendicularly cross through each other. VCMRR's at each of the cross-grid nodes serve as the wavelength selective add-drop filters. Measured crosstalk levels at the crossings are typically less than -30 dB. Rings with a nominal radius of 10 μm are used to achieve a free-spectral range of 20 nm and optical bandwidths of 1 nm, while changes of the radii in increments of 50 nm lead to a nominal channel spacing of 5.7 nm.
We detail in this paper the implementation of the optimal Bayes multiframe detector/tracker for rigid objects moving randomly in two-dimensional (2D) finite grids. We present 2D models for target signature and target ...
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We detail in this paper the implementation of the optimal Bayes multiframe detector/tracker for rigid objects moving randomly in two-dimensional (2D) finite grids. We present 2D models for target signature and target motion that build an integrated framework for detection and tracking. We model the background clutter by 2D correlated noncausal Gauss-Markov fields of arbitrary order. By exploring the structure of the signature, motion, and clutter models, we indicate how substantial comp.tational savings can be achieved in the implementation of the algorithm. The detection performance of the proposed Bayes scheme is evaluated through Monte Carlo simulations. The results show significant performance gains of over 6 dB in peak signal-to-noise ratio when the optimal multiframe detector is comp.red to the optimal single frame likelihood ratio test (LRT) detector.
Engineering education is beset by many of the same challenges that have affected American industry. Much has been recommended and implemented to improve engineering education. However, the traditional structure of eng...
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Engineering education is beset by many of the same challenges that have affected American industry. Much has been recommended and implemented to improve engineering education. However, the traditional structure of engineering education remains, even though current exigencies require a fundamental restructuring. A Para/Professional Model is proposed in this paper as an alternative to the traditional structure;it serves to mitigate the growing cost of education, to overcome the declining quality of high school graduates, to meet the growing need for professional engineers, and to enhance the link between research and engineering education. While the proposed Para/Professional Model is consistent with those advocating a five-year engineering higher education program leading to a Master's degree, it is novel in that it suggests formally breaking up the program into a two-year and a three-year comp.nent, leading, respectively, to a para-engineering degree and a professional (i.e. Master's) degree. Further, the para/professional approach is responsive to the needs of the 21st century and should enhance the engineering profession and raise the self-esteem of US engineers.
In this paper, an adaptive control scheme for constrained robots is proposed. This control law ensures the asymptotic convergence of the position and the force tracking errors to zero, and it guarantees that the estim...
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In this paper, an adaptive control scheme for constrained robots is proposed. This control law ensures the asymptotic convergence of the position and the force tracking errors to zero, and it guarantees that the estimates of the unknown dynamic parameters of the robot are bounded. The control scheme does not require measurements of the joint accelerations or the estimation of the derivative of the force. The control scheme requires few on-line comp.tations and thus can be easily implemented. Implementation results on a Zebra-Zero robot are given to illustrate the theoretical developments.
The article proposes a method of calculating the minimum parallel execution time of loops. The loop is comp.etely unrolled and the task graph is considered. By assigning the execution time of the corresponding task an...
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The article proposes a method of calculating the minimum parallel execution time of loops. The loop is comp.etely unrolled and the task graph is considered. By assigning the execution time of the corresponding task and the communication time related to the dependency as costs to the nodes and edges of the task graph, the cost of the critical path which is the path for which the total cost of the nodes and edges comp.sing the path is the maximum, gives the minimum parallel execution time of the loops. It is not desirable, however, in considering the comp.tation time and the required memory capacity, to unroll the loops comp.etely. The method presented here formulates the problem as the integer programming problem, and calculates the cost of the critical path without rolling the loops at all. In this study, a branch and bound algorithm that solves the integer programming problem is implemented. The implemented algorithm unrolls the loops and determines the critical path on the task graph. As a result of evaluation using Livermore's benchmark kernel, it is verified that the implemented algorithm can be executed in a sufficiently practical time, regardless of the size (number of iterations) of the loops.
We describe initial steps we have taken in the development of zone-plate-array lithography (ZPAL) a proposed new paradigm for sub-100 nm lithography. The optimal implementation of ZPAL would employ an undulator emitti...
The sh-verification tool comp.ises comp.ting abstractions of finite-state behaviour representations as well as automata and temporal logic based verification approaches. To be suitable for the verification of so calle...
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The sh-verification tool comp.ises comp.ting abstractions of finite-state behaviour representations as well as automata and temporal logic based verification approaches. To be suitable for the verification of so called co-operating systems, a modified type of satisfaction relation (approximate satisfaction) is considered. Regarding abstraction, alphabetic language homomorphisms are used to comp.te abstract behaviours. To avoid loss of important information when moving to the abstract level, abstracting homomorphisms have to satisfy a certain property called simplicity on the concrete (i.e. not abstracted) behaviour. The well known state space explosion problem is tackled by a comp.sitional method combined with a partial order method.
Fractal image coding is a comp.ession technique with many promising features, but it has been primarily placed in the class of archival coding algorithms due to its comp.tationally expensive encoding algorithm. Though...
Fractal image coding is a comp.ession technique with many promising features, but it has been primarily placed in the class of archival coding algorithms due to its comp.tationally expensive encoding algorithm. Though fractal coding has been extensively optimized for speed, it is still not practical for real-time applications on most sequential machines. The problem with fractal coding lies in the large amount of pixel block comp.risons that are required, which makes fractal coding better suited toward parallel systems. At the same time, VLSI area has become a much less important constraint in chip design due to better fabrication techniques and smaller micron technologies. This has lead to a recent trend for designing parallel subsystems and including multimedia ASIC circuitry on general purpose CPUs. In this paper, we will present a parallel ASIC array architecture for use in fractal encoding that performs a full domain quad-tree search in near real-time for standard sized gray scale images. The design is also scalable so that larger images can be encoded faster by adding chips to the array. In designing this architecture, we include novel optimizations at the algorithmic, architecture, and circuit levels.
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