Results 1 - 10 of 140

A Multi-Algorithm, Multi-Timescale Method for Cell Simulation

by Kouichi Takahashi, Kazunari Kaizu, Bin Hu, Masaru Tomita , 2004
"... Motivation: Many important problems in cell biology require the dense nonlinear interactions between functional modules to be considered. The importance of computer simulation in understanding cellular processes is now widely accepted, and a variety of simulation algorithms useful for studying certa ..."
Abstract - Cited by 55 (5 self) - Add to MetaCart
accuracy drawbacks. A multitimescale demonstration of coupled harmonic oscillators is also shown. Availability: An implementation of the method is available as part of E-Cell Simulation Environment Version 3 downloadable from

Genetic programming for multi-timescale modeling

by Kumara Sastry, D. D. Johnson, David E. Goldberg, Pascal Bellon - SUBMITTED TO PHYSICAL REVIEW LETTERS , 2003
"... A bottleneck for multi-timescale modeling is the computation of activation energies (or potential energy surface, PES). We explore the use of genetic programming (GP)—a genetic algorithm that evolves computer programs—to perform symbolic regression to create a local mapping of the activation energ ..."
Abstract - Cited by 3 (2 self) - Add to MetaCart
A bottleneck for multi-timescale modeling is the computation of activation energies (or potential energy surface, PES). We explore the use of genetic programming (GP)—a genetic algorithm that evolves computer programs—to perform symbolic regression to create a local mapping of the activation

ATOMIC DECOMPOSITION BY BASIS PURSUIT

by Scott Shaobing Chen , David L. Donoho , Michael A. Saunders , 1995
"... The Time-Frequency and Time-Scale communities have recently developed a large number of overcomplete waveform dictionaries -- stationary wavelets, wavelet packets, cosine packets, chirplets, and warplets, to name a few. Decomposition into overcomplete systems is not unique, and several methods for d ..."
Abstract - Cited by 2728 (61 self) - Add to MetaCart
The Time-Frequency and Time-Scale communities have recently developed a large number of overcomplete waveform dictionaries -- stationary wavelets, wavelet packets, cosine packets, chirplets, and warplets, to name a few. Decomposition into overcomplete systems is not unique, and several methods

Metric Based Multi-Timescale Control For Reducing Power In Embedded Systems

by Nitin Kataria, Forrest Brewer, João Hespanha, Timothy Sherwood
"... Abstract—Digital control for embedded systems often requires low-power, hard real-time computation to satisfy high control-loop bandwidth, low latency, and low-power requirements. In particular, the emerging applications of Micro Electro-Mechanical Systems (MEMS) sensors, and their increasing integr ..."
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power, at the expense of controlled loss in control fidelity. Since the error tolerance of linear feedback control systems is mathematically wellposed, this technique opens up a new, independent dimension for system optimization. We present a novel Computer-Aided Design (CAD) method to evaluate control

Accepted by IEEE TRANSACTIONS ON POWER SYSTEMS 1

by unknown authors
"... Abstract—Many blackouts in electric power grids throughout the world are caused by cascading outages, which often involve complex processes in various timescales. The multi-timescale nature of cascading outages makes conventional quasi-static simulation methods inaccurate in characterizing actual ev ..."
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Abstract—Many blackouts in electric power grids throughout the world are caused by cascading outages, which often involve complex processes in various timescales. The multi-timescale nature of cascading outages makes conventional quasi-static simulation methods inaccurate in characterizing actual

Reconstructing past climate from noisy data. Science 306: 679–682

by Hans Von Storch, Eduardo Zorita, Julie Jones, Yegor Dimitriev, Fidel González-rouco, Simon Tett - Dimitriev Y, González-Rouco F, Tett S , 2004
"... (NH) temperature in the last millennium based on multy proxy records depict small-amplitude variations followed by a clear warming trend in the last two centuries. We use a coupled atmosphere-ocean model simulation of the last 1000 years as a surrogate climate to test the skill of these methods, par ..."
Abstract - Cited by 77 (10 self) - Add to MetaCart
(NH) temperature in the last millennium based on multy proxy records depict small-amplitude variations followed by a clear warming trend in the last two centuries. We use a coupled atmosphere-ocean model simulation of the last 1000 years as a surrogate climate to test the skill of these methods

Performance Impacts of Multi-Scaling in Wide Area TCP/IP Traffic

by Ashok Erramilli, Onuttom Narayan, Arnold Neidhardt, Iraj Saniee - Proceedings of IEEE INFOCOM , 2000
"... Recent measurement and simulation studies have revealed that wide area network traffic has complex statistical---possibly multifractal---characteristics on short timescales, and is self-similar on long timescales. In this paper, using measured TCP traces and queueing simulations, we show that the fi ..."
Abstract - Cited by 41 (1 self) - Add to MetaCart
that the fine timescale features can affect performance substantially at low and intermediate utilizations, while the coarse timescale self-similarity is important at intermediate and high utilizations. We outline an analytical method for estimating performance for traffic that is self-similar on coarse

1 Taming Uncertainties in Real-Time Routing for Wireless Networked Sensing and Control

by Xiaohui Liu, Hongwei Zhang, Qiao Xiang, Xin Che, Student Member, Xi Ju
"... Abstract—Real-time routing is a basic element of closedloop, real-time sensing and control, but it is challenging due to dynamic, uncertain link/path delays. The probabilistic nature of link/path delays makes the basic problem of computing the probabilistic distribution of path delays NP-hard, yet q ..."
Abstract - Cited by 4 (1 self) - Add to MetaCart
observed that delay-based routing can lead to instability, estimation error, and low data delivery performance in general. To address these challenges, we propose the Multi-Timescale Estimation (MTE) method; by accurately estimating the mean and variance of per-packet transmission time and by adapting

Timbrescape: a Musical Timbre and Structure Visualization Method Using Tristimulus Data

by Rodrigo Segnini Sequera
"... The tristimulus [Pollard & Jansson, 1982] is a timbre de-scriptor based on a division of the frequency spectrum in three bands. Likewise its homonymous model for color description, it provides an approximation to a perceptual value through parametric control of a physical measure-ment. The origi ..."
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for visualizing tristimulus data as well as the structural boundaries that result from timbre infor-mation thus represented. This method uses a multi-timescale approach that offers at-a-glance information for arbitrarily sized sections and the whole sound sequence in a single picture; it is based on the Scoregram

Transport and Chemical Reaction: Characteristics Method and Splitting Methods

by Asgar Jamneshan , 2008
"... In this paper we present computational schemes for solving transport and chemical reaction processes. The model is based on a convection-diffusion-reaction equation which models our fluid dynamics of the depo-sition process. For the spatial discretization we combine characteristics methods for the a ..."
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equations. The different time-scales are coupled by transfer-operators and we discuss a multi-scale solver. In the numerical experiments we present a microscopic model for partical trans-port. The accuracy of the methods are discussed.
Results 1 - 10 of 140