In this paper we make an analogy between the time that storage must be maintained in a optimistic simulation and the blocking time in a conservative simulation. By exploring this analogy, we design two new Global Virt...
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(纸本)1565550277
In this paper we make an analogy between the time that storage must be maintained in a optimistic simulation and the blocking time in a conservative simulation. By exploring this analogy, we design two new Global Virtual Time (GVT) protocols for Time Warp systems. The first protocol is based on null message clock advancement in conservative approaches. Our main contribution is a new protocol inspired by Misra's circulating marker scheme for deadlock recovery. It is simple enough to be implemented in hardware, takes no overhead in the normal path, can be made to work over non-FIFO links, and its overhead can be dynamically tuned based on computational load.
The topology and the capacity of a traditional multilayer neural system, as measured by the number of connections in the network, has surprisingly little impact on its generalization ability. This paper presents a new...
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The topology and the capacity of a traditional multilayer neural system, as measured by the number of connections in the network, has surprisingly little impact on its generalization ability. This paper presents a new adaptive modular network that offers superior generalization capability. The new network provides significant fault tolerance, quick adaption to novel inputs, and high recognition accuracy. We demonstrate this paradigm on recognition of unconstrained handwritten characters.
Using both XRD and HRTEM lattice imaging, we have shown that CO2 laser pyrolysis (LP) produces nanoscale transition metal carbide and nitride catalysts, including cubic Mo2C, Mo2N, and W2N, which possess highly crysta...
Using both XRD and HRTEM lattice imaging, we have shown that CO2 laser pyrolysis (LP) produces nanoscale transition metal carbide and nitride catalysts, including cubic Mo2C, Mo2N, and W2N, which possess highly crystalline structures in their as-synthesized form In contrast, LP-produced W2C in its hexagonal phase is disordered. Clear lattice expansion, induced by the small crystallite size of the nanoparticles has been observed for LP-produced Mo2C particles, which have a typical crystallite size of 2 nm. No carbon coating was observed in HRTEM for LP-produced Mo2C particles. Furthermore, Mo=N and Mo=C bonding in Mo2N and Mo2C, respectively, were identified by an XPS measurement, which also reveals the presence of a thin oxide layer formed on the particle surface during the passivation process. Finally, the average crystallite sizes determined from HRTEM and XRD are in good agreement, indicating that the line broadening observed in XRD is due to the small crystallite size of the nanoparticles.
This paper presents a comparison of H/sub /spl infin////spl mu/-synthesis sliding-mode that was done for heading and depth control of the Draper Laboratory/mit Sea Grant Sea Squirt autonomous underwater vehicle (AUV)....
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This paper presents a comparison of H/sub /spl infin////spl mu/-synthesis sliding-mode that was done for heading and depth control of the Draper Laboratory/mit Sea Grant Sea Squirt autonomous underwater vehicle (AUV). The approximate decoupling of the AUV heading and depth dynamics allowed us to have decoupled heading and depth designs for both the H/sub /spl infin////spl mu/-synthesis and the sliding-mode methodologies. The H/sub /spl infin////spl mu/-synthesis based controllers and the sliding-mode based controllers were implemented and tested by using a simulation of the AUV full order nonlinear model (including thruster and sensor dynamics). We analyzed the performance of the controllers (for a simultaneous depth and maneuver) over the approximate range of axial velocities commanded by the AUV. The performance of the controllers in the face of additive sensor noise was also analyzed.
The authors characterize electrostatic and other polymer-polymer interactions within an ultracentrifuge cell using a new electrochemical transport model. Applying conservation of mass and momentum of solutes and solve...
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The authors characterize electrostatic and other polymer-polymer interactions within an ultracentrifuge cell using a new electrochemical transport model. Applying conservation of mass and momentum of solutes and solvent, and Maxwell's equations valid in the electroquasistatic limit, together with initial and boundary conditions on solute (and electrolyte) distribution, the authors predict the transient (nonequilibrium) and equilibrium solute (and electrolyte) distributions, net charge density, electric field, and electrostatic potential profiles. This model represents a significant advance ever the Lamm equation (and its extensions) (H. Fujita, 1962), which describe polymer-polymer interactions phenomenologically (using empirical virial coefficients) (L.W. Nichol et al., 1967).< >
Human vision, machine vision, and image coding, all have to deal with the problem of finding representations that are useful and efficient. The best-known techniques are based on low-level processing, using signal pro...
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Human vision, machine vision, and image coding, all have to deal with the problem of finding representations that are useful and efficient. The best-known techniques are based on low-level processing, using signal processing concepts such as filters, transforms, and simple non-linearities. Low-level concepts are at the heart of standard vision systems for computing optic flow, texture, etc. Low-level image coding techniques include DCTs, pyramids, wavelets, etc. To advance to a new generation of image coding architectures one must work with new image representations that involve such concepts as surfaces, lighting, transparency, etc. These representations fall in the domain of "mid-level" vision. By representing images with these more sophisticated vocabularies one can increase the flexibility and efficiency of the vision and image coding systems. The authors decompose an image sequence into a set of overlapping layers, rather like the "cels" used by a traditional animator. These layers are ordered in depth, sliding over one another and being combined according to the rules of transparency and occlusion. For some test sequences the authors achieve data compression far better than is possible with standard techniques such as MPEG.< >
High resolution temperature measurement is essential for determination of blood perfusion in biomaterials. A compact, low noise, high resolution temperature sensor designed for use in an invasive tissue property measu...
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High resolution temperature measurement is essential for determination of blood perfusion in biomaterials. A compact, low noise, high resolution temperature sensor designed for use in an invasive tissue property measurement probe is presented. The technique uses feedback to improve linearity and reduce noise. Data from test chips shows temperature resolution of 6.8 m°C. The chips were fabricated using a 1.75 um double poly, single metal modified CMOS process designed for this project.
We report a detailed experimental analysis of both electron and hole Real Space Transfer occurring in InAlAs/InGaAs heterostructure devices grown on InP. At high drain-source voltages electrons are heated and holes ar...
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We report a detailed experimental analysis of both electron and hole Real Space Transfer occurring in InAlAs/InGaAs heterostructure devices grown on InP. At high drain-source voltages electrons are heated and holes ar...
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We report a detailed experimental analysis of both electron and hole Real Space Transfer occurring in InAlAs/InGaAs heterostructure devices grown on InP. At high drain-source voltages electrons are heated and holes are created by impact ionization. Both electrons and holes contribute to the gate current whereas the relative size of these contribution depends on the magnitude and polarity of the bias applied to the control and to the drain electrode.
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