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Semiconductor process, device, and circuit simulation plays a significant role in the development of integrated circuit technology, providing quick prototyping and quantities not easily measured. Predictive models allow optimization of chip designs and are an essential component of the technology design process. As semiconductor devices shrink into the deep-submicron regime, device simulation faces...
Describes a parallel solver for the nonlinear Poisson-Boltzmann equation modeling the distribution of an electrostatic potential in a MOSFET in three dimensions. The nonlinear system is solved with Newton's method. The linearized mathematical model is solved by the conjugate gradients method preconditioned by a parallel version of incomplete Cholesky factorization. This technique is easy to implement...
The complexity of multi-level cache hierarchies simulation is much more complicated than that of single-level cache simulation, so that it is highly desirable to develop some efficient simulation methods for multi-level cache hierarchies performance analysis. A one pass multi-level unified cache hierarchies simulation method is developed based on stack model and inclusion properties. Recently, many...
Write-buffers have a significant impact on performance, especially in wide-issue superscalar systems with write-through caching. We develop fast efficient simulation methods for evaluating multiple write-buffer configurations together in a single-pass. Our results are also applicable for the simulation of other buffer structures. We first consider simulating non-coalescing write-buffers. We show that...
HASE is a hierarchical computer architectural design and simulation environment which allows a computer architecture and its implementation to be represented graphically at several different levels of abstraction. Class inheritance is used to factor out common behaviour, for example, producer/consumer synchronisations, queue and statistics functions inherited by the memory, bus and function unit hierarchies...
The authors have designed and built HARP (Hermite AcceleratoR Pipeline)-1, a special-purpose computer for solving astronomical N-body problems with high accuracy using the Hermite integrator. The Hermite integrator uses analytically calculated time derivatives of the acceleration, in addition to the acceleration, to integrate orbits of particles. HARP-I has a 24-stage pipeline to perform the calculation...
In the area of telerobotics, where remote systems are to be controlled, it is helpful to plan subsequent operations based on as much relevant data as possible. The simulation of the remote system, executed in parallel, can provide additional information, otherwise difficult or impossible to retrieve from sensor feedback. In this paper, the integrated DiSCUS environment (Distributed Simulation and...
The authors propose a tool for systems analysis that incorporates hypertext, simulation and expert system techniques. The tool, Hyper Analysis Toolkit (HAT), provides a hypertext linkage of graphical models, such as DFDs (data flow diagrams) and ERDs (entity relation diagrams) with system description narratives and other documents created during the early stages of systems analysis. Hyperlinks placed...
Describes MESA, a domain-independent interactive tool for the development of reusable causal models and model-based-reasoning applications. Our current efforts are focused on developing automated sensor monitoring applications for NASA flight projects. MESA supports model development from a component-centered approach and provides a graphical editor for rapidly prototyping components and connections...
Animated sensitivity analysis allows a user to make continuous changes to model inputs and simultaneously see the effects on the model. This produces an animated view of the behavior of the model. Prior research has proposed and demonstrated its use for production scheduling, teaching linear programming and for research on combinatorial optimization. This paper explores its use for minimum cost network...
Decision makers often need to find solutions to problems that they understand only approximately. For these difficult situations, we consider a model-based approach for a type of analysis which we term 'candle lighting analysis', which suggests actions we might take to create new and better options. This paper shows how a space of actions can be searched by a genetic algorithm, automatically providing...
The purpose of this work is to further the understanding of the impact of information technology on organizational remembering and forgetting. Simulation is used to investigate the mechanics of collective memory and the impacts of information technology that are suggested by a conceptual model based upon structuration theory. Three mnemonic forms are modeled (hierarchy, network, and hub) under different...
Computer simulation models have been proposed as aids for policy negotiations in complex domains. We studied the use of such a model by college students in mock policy negotiations in reservoir management. Comparisons between groups given differing forms of access to the model suggest that: (I) the model is of limited value in helping negotiators understand the task per se; (2) the model does provide...
Computer-based tools for the representation and simulation of business processes have been noted for their importance in the support of reengineering activities. However, organizational processes can be extremely difficult to represent and simulate mathematically, and limitations of the knowledge-based systems common in the business domain can preclude them from effectively supporting process analysis...
Competition conditions in the newspaper industry force the management to use new tools for strategic planning. The rapidly changing market conditions are to be managed and the internal efficiency must be improved. This paper presents a method to combine an analysis of the complex causalities of revenues from the advertising and circulation market with the economic result of the newspaper. The principles...
Business Process Re-engineering (BPR) can lead to huge savings and may be essential to survival in a competitive environment; but decisions to redesign business processes are often based upon little more than heuristics and gut feelings. Dynamic modeling techniques add rigor to BPR, however, off-the-shelf simulation software is not generally well-tailored to the BPR approach. We have developed a Dynamic...
Electronic financial markers use information technology to disseminate prices, quantities, and buyer and supplier identities. In spite of their recognized benefits, increased visibility and transparency may introduce imperfections, and create profitable opportunities to bypass markets. In the US, dissemination of market data has equipped several firms to develop competing, off-exchange trading mechanisms...
We have developed a new computer language that describes three-dimensional graphical objects in visual simulation. The language, 3D-Talk is a powerful tool for visualizing the process of protein folding simulation. 3D-Talk is designed as an object-oriented language with which users can create, manipulate, and edit graphical objects using commands with a syntax similar to that of a natural language...
A coarse-grain parallel algorithm for nonlinear constrained minimization allows interactive modeling of electrostatic interactions in proteins. The constrained minimization problem is the basis of a graphical protein modeling system called Sculpt. While a user interactively changes a protein structure or explores protein-drug interaction, Sculpt maintains protein properties such as bond lengths and...
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