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Full-Text Articles in Computer Engineering
Asymptotic Data Rates Of Receive-Diversity Systems With Mmse Estimation And Interferers At Correlated Locations, Siddhartan Govindasamy
Asymptotic Data Rates Of Receive-Diversity Systems With Mmse Estimation And Interferers At Correlated Locations, Siddhartan Govindasamy
Siddhartan Govindasamy
An asymptotic technique is presented to characterize the bits/symbol achievable on a representative wireless link in a spatially distributed network with active interferers at correlated positions, N receive diversity branches, and linear Minimum-Mean-Square-Error (MMSE) receivers. The models analyzed include analogs to Matern type I and type II networks. It is found that for our network models, with large N, the correlation between interferer positions does not significantly influence the bits/symbol resulting in simple approximations for the data rates achievable in such networks with moderately large numbers of diversity branches.
Casting A Wider Net, Lynn Stein
Casting A Wider Net, Lynn Stein
Lynn Andrea Stein
This article is a book review of Mung Chiang's book Networked Life: 20 Questions and Answers. In this text intended for both classroom and online learning, Chiang uses questions about our online lives to explore the technology and computer science behind the Internet, wireless, and Web industries.
A Parameterized Stereo Vision Core For Fpgas, Mark Chang, Stephen Longfield
A Parameterized Stereo Vision Core For Fpgas, Mark Chang, Stephen Longfield
Mark L. Chang
We present a parameterized stereo vision core suitable for a wide range of FPGA targets and stereo vision applications. By enabling easy tuning of algorithm parameters, our system allows for rapid exploration of the design space and simpler implementation of high-performance stereo vision systems. This implementation utilizes the census transform algorithm to calculate depth information from a pair of images delivered from a simulated stereo camera pair. This work advances our previous work through implementation improvements, a stereo camera pair simulation framework, and a scalable stereo vision core.
Precis: A Usercentric Word-Length Optimization Tool, Mark Chang, Scott Hauck
Precis: A Usercentric Word-Length Optimization Tool, Mark Chang, Scott Hauck
Mark L. Chang
Translating an algorithm designed for a general-purpose processor into an algorithm optimized for custom logic requires extensive knowledge of the algorithm and the target hardware. Precis lets designers analyze the precision requirements of algorithms specified in Matlab. The design time tool combines simulation, user input, and program analysis to help designers focus their manual precision optimization efforts.
Method Of And Apparatus For Computer-Aided Generation Of Variations Of A Sequence Of Symbols, Such As A Musical Piece, And Other Data, Character Or Image Sequences, Diana Dabby
Diana Dabby
A procedure for generating different variations of a sequence of symbols, such as a musical piece, based on the properties of a chaotic system--most notably, sensitive dependence on the initial condition--is described and demonstrated. This method preferably uses a fourth order Runge-Kutta implementation of a chaotic system. Bach's Prelude in C Major from the Well-Tempered Clavier, Book I serves as the illustrative example since it is well-known and easily accessible. Variations of the Bach can be heard that are very close to the original while others diverge further. The system is designed for composers who, having created a through-composed work …
(Re)Defining Computing Curricula By (Re)Defining Computing, Charles Isbell, Lynn Stein, Robb Cutler, Jeffrey Forbes, Linda Fraser, John Impagliazzo, Viera Proulx, Steve Russ, Richard Thomas, Yan Xu
(Re)Defining Computing Curricula By (Re)Defining Computing, Charles Isbell, Lynn Stein, Robb Cutler, Jeffrey Forbes, Linda Fraser, John Impagliazzo, Viera Proulx, Steve Russ, Richard Thomas, Yan Xu
Lynn Andrea Stein
What is the core of Computing? This paper defines the discipline of computing as centered around the notion of modeling, especially those models that are automatable and automatically manipulable. We argue that this central idea crucially connects models with languages and machines rather than focusing on and around computational artifacts, and that it admits a very broad set of fields while still distinguishing the discipline from mathematics, engineering and science. The resulting computational curriculum focuses on modeling, scales and limits, simulation, abstraction, and automation as key components of a computationalist mindset.
An Atemporal Frame Problem, Lynn Stein
An Atemporal Frame Problem, Lynn Stein
Lynn Andrea Stein
Given some changes in the world, the frame problem is the problem of determining that most things in the world haven't changed. Since change is generally taken to mean "change over time", the frame problem is generally assumed to be a problem of temporal reasoning, and most examples of the frame problem are couched in terms of the effects of actions. In this paper, I point out the fallacy underlying this approach, and demonstrate something very much like the frame problem that is completely independent of time: the counterfactual validity problem. I show that this "atemporal frame problem" proves damning …
Challenging The Computational Metaphor: Implications For How We Think, Lynn Stein
Challenging The Computational Metaphor: Implications For How We Think, Lynn Stein
Lynn Andrea Stein
This paper explores the role of the traditional computational metaphor in our thinking as computer scientists, its influence on epistemological styles, and its implications for our understanding of cognition. It proposes to replace the conventional metaphor a sequence of steps with the notion of a community of interacting entities, and examines the ramifications of such a shift on these various ways in which we think.
If Emulation Is Representation, Does Detail Matter?, Lynn Stein
If Emulation Is Representation, Does Detail Matter?, Lynn Stein
Lynn Andrea Stein
One property of the emulator framework presented by Grush is that imagery operates off-line. Contrary to this viewpoint, we present evidence showing that mental rotation of a simple figure modulates low-level features of drawing articulation. This effect is dependent upon the type of rotation, suggesting a more integrative online role for imagery than proposed by the target article.