As transistor feature sizes decrease exponentially, the critical problem in massively parallel architectures for multimedia systems becomes the wire delay latency imposed by transporting operands. In this paper, we fi...
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ISBN:
(纸本)0769521827
As transistor feature sizes decrease exponentially, the critical problem in massively parallel architectures for multimedia systems becomes the wire delay latency imposed by transporting operands. In this paper, we first characterize the locality properties of operands in multi-media applications to motivate the development of alternate low-cost and low-latency operand communication mechanisms. Based on the locality properties, we then present the results of a simulation study that estimates the impact of varying sized local storage on the transport complexity of the operands. A small amount of local storage (eight-entry) per functional unit with approximate information on operand dynamic lifetimes is sufficient to suppress 79.4% of operand writes in MediaBench applications. The empirical study shows that local storage alone reduces operand read traffic by upto 35.5%.
This paper describes the fabrication and integration of a thin film edge emitting laser (EEL) whose optical output is coupled into a polymer waveguide integrated on the same elec.rical interconnection substrate. This ...
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This paper describes the fabrication and integration of a thin film edge emitting laser (EEL) whose optical output is coupled into a polymer waveguide integrated on the same elec.rical interconnection substrate. This embedded laser/waveguide structure is a fundamental building block toward the realization of planar lightwave circuits using embedded optical interconnections. The demonstration of a thin film laser embedded with a waveguide eliminates the need for either an external optical source coupled to the waveguide or a bump bonded optical source with a beam turning element to launch an optical wave into the waveguide.
The objective of this paper is to model a linear variable reluctance motor using nonlinear magnetic circuit techniques, in order to account for material saturation and mutual coupling. The magnetic circuit approach ha...
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The objective of this paper is to model a linear variable reluctance motor using nonlinear magnetic circuit techniques, in order to account for material saturation and mutual coupling. The magnetic circuit approach has the advantages of simplicity and computational efficiency, so it is well suited for rapid performance evaluation at the initial design stage. The accuracy of the magnetic circuit model is directly compared with results from finite element analysis.
A novel multitarget tracking sch.me for passive radar, using a particle filter implementation of Ronald Mahler's Probability Hypothesis Density (PHD), is presented. Using range and velocity measurements from a sim...
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A novel multitarget tracking sch.me for passive radar, using a particle filter implementation of Ronald Mahler's Probability Hypothesis Density (PHD), is presented. Using range and velocity measurements from a simple non-directional receive antenna and low frequency transmitter pair, a target can be located along an ellipse. To pinpoint a target, multiple such antenna pairs are needed to locate the target at the intersection of the corresponding ellipses. Determining the intersection of these bistatic range ellipses, and resolving the resultant ghost targets, is generally a complex task. However, the PHD is found to provide a convenient and simple means of fusing together the multiple range and velocity measurements into coherent target tracks.
The objective of this paper is to simulate and study the dynamics of a linear variable reluctance motor using coupled network models. The need for an explicit functional expression to describe flux linkage has been el...
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The objective of this paper is to simulate and study the dynamics of a linear variable reluctance motor using coupled network models. The need for an explicit functional expression to describe flux linkage has been eliminated, since the magnetic subsystem is coupled to, and simultaneously solved with, the dynamics of the elec.rical and mechanical subsystems. This paper focuses on the development of a coupled network model that incorporates the effects of magnetic saturation and spatial harmonics, and also includes the application of position control software interacting with the physical system.
This paper presents an overview of our work, concerning a complete end-to-end framework for automatically generating message passing parallel code for tiled nested for-loops. It considers general parallelepiped tiling...
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ISBN:
(纸本)9781581138122
This paper presents an overview of our work, concerning a complete end-to-end framework for automatically generating message passing parallel code for tiled nested for-loops. It considers general parallelepiped tiling transformations and general convex iteration spaces. We address all problems regarding both the generation of sequential tiled code and its parallelization. We have implemented our techniques in a tool which automatically generates MPI parallel code and conducted several series of experiments, concerning the compilation time of our tool, the efficiency of the generated code and the speedup attained on a cluster of PCs. Apart from confirming the value of our techniques, our experimental results show the merit of general parallelepiped tiling transformations and verify previous theoretical work on sch.duling-optimal tile shapes.
The notion of balancing for linear systems is extended to the nonlinear realm. The proposed method of balancing is based upon three principles: 1) Balancing should be denned with respect to a nominal flow;2) Only Gram...
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The notion of balancing for linear systems is extended to the nonlinear realm. The proposed method of balancing is based upon three principles: 1) Balancing should be denned with respect to a nominal flow;2) Only Gramians defined over small time intervals should be used to preserve the accuracy of the linear perturbation model and;3) Linearization should commute with balancing, in the sense that the linearization of a globally balanced model should correspond to the balanced linearized model in the original coordinates. Whereas it is generically possible to define a balanced framework locally, it is not possible to do so globally. Obstruction to the integrability of the Jacobian is generic in dimensions, n > 2. Here we show how to obtain the global balanced realization if the Mayer-Lie conditions are satisfied, and an interpolation method by integrable functions is proposed when this is not the case. The latter thus defines pseudo-balanced realizations.
To mitigate capital equipment investments and enhance product quality, semiconductor manufactures are turning to advanced process control (APC) methods. With the objective of facilitating APC, this paper investigates ...
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To mitigate capital equipment investments and enhance product quality, semiconductor manufactures are turning to advanced process control (APC) methods. With the objective of facilitating APC, this paper investigates a methodology for real-time malfunction diagnosis of reactive ion etching (RIE) employing two types of in situ metrology: optical emission spectroscopy (OES) and residual gas analysis (RGA). Based on metrology data, time series neural networks (TSNNs) are trained to generate evidential belief for potential malfunctions in real time, and Dempster-Shafer (D-S) theory is adopted for evidential reasoning. Successful malfunction diagnosis is achieved, with only a single missed alarm and a single false alarm occurring out of 21 test runs when both sensors are used in tandem. From the results, we conclude that the OES and RGA sensors, in conjunction with the TSNN models, can be effectively used for RIE monitoring and diagnosis. Furthermore, D-S theory is shown to be an appropriate inference methodology.
This paper provides a comparison between two types of linear variable reluctance motors. The coupled flux path configuration has a non-diagonal inductance matrix and is operated with synchronous excitation, whereas th...
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This paper provides a comparison between two types of linear variable reluctance motors. The coupled flux path configuration has a non-diagonal inductance matrix and is operated with synchronous excitation, whereas the uncoupled flux path configuration has a diagonal inductance matrix and is operated with switched excitation. Constrained optimization methods are used to investigate the force production capabilities of both magnetic configurations. The specific measure of performance emphasized here is the ratio of current-limited ripple-free force to moving mass or, equivalently, the maximum achievable fully controllable acceleration. This focus is motivated by robotics applications, e.g. component placement machines used in elec.ronics assembly.
In this work, we have found that the charging of nc-Si in a thin gate oxide can induce a reduction in the total gate oxide capacitance. The capacitance can approach zero value if all the nanocrystals are charged up. T...
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In this work, we have found that the charging of nc-Si in a thin gate oxide can induce a reduction in the total gate oxide capacitance. The capacitance can approach zero value if all the nanocrystals are charged up. The reduction of the gate oxide capacitance is attributed to the premature breakdown in the gate oxide due to the charging up in the nanocrystals, as the reduction of the gate oxide capacitance corresponds to a large decrease in the gate oxide leakage current. Here the breakdown caused by the charging in the nanocrystals is somewhat similar to the soft or hard breakdown in pure SiO2 thin films that are related to the charge trapping in the oxide film. The breakdown caused by the charging in the nanocrystals is found to be fully recoverable under ultra-violet (UV) light illumination for 5 minutes and a thermal annealing at temperature of 100°C for 10 minutes. The reduction and recovery of the capacitance due to the charging and disch.rging in the nanocrystals is explained with an equivalent circuit model.
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