Results 1 - 10 of 8,056

Coverage Control for Mobile Sensing Networks

by Jorge Cortes, Sonia Martínez, Timur Karatas, Francesco Bullo , 2002
"... This paper presents control and coordination algorithms for groups of vehicles. The focus is on autonomous vehicle networks performing distributed sensing tasks where each vehicle plays the role of a mobile tunable sensor. The paper proposes gradient descent algorithms for a class of utility functio ..."
Abstract - Cited by 582 (49 self) - Add to MetaCart
This paper presents control and coordination algorithms for groups of vehicles. The focus is on autonomous vehicle networks performing distributed sensing tasks where each vehicle plays the role of a mobile tunable sensor. The paper proposes gradient descent algorithms for a class of utility

A statistical interpretation of term specificity and its application in retrieval

by Karen Spärck Jones - Journal of Documentation , 1972
"... Abstract: The exhaustivity of document descriptions and the specificity of index terms are usually regarded as independent. It is suggested that specificity should be interpreted statistically, as a function of term use rather than of term meaning. The effects on retrieval of variations in term spec ..."
Abstract - Cited by 589 (3 self) - Add to MetaCart
specificity are examined, experiments with three test collections showing, in particular, that frequently-occurring terms are required for good overall performance. It is argued that terms should be weighted according to collection frequency, so that matches on less frequent, more specific, terms

The Generative Lexicon

by James Pustejovsky - Computational Linguistics , 1991
"... this paper, I will discuss four major topics relating to current research in lexical semantics: methodology, descriptive coverage, adequacy of the representation, and the computational usefulness of representations. In addressing these issues, I will discuss what I think are some of the central prob ..."
Abstract - Cited by 1341 (45 self) - Add to MetaCart
this paper, I will discuss four major topics relating to current research in lexical semantics: methodology, descriptive coverage, adequacy of the representation, and the computational usefulness of representations. In addressing these issues, I will discuss what I think are some of the central

Coverage-performance estimation for classification with ambiguous data

by unknown authors
"... Abstract. Classifier tradeoffs between accuracy and specificity are often analyzed with receiver operating curves (ROC). Here we study a related analysis of the data in terms of coverage–performance curves (CPC) which more clearly indicate the presence of ambiguous data in classification problems wi ..."
Abstract - Add to MetaCart
Abstract. Classifier tradeoffs between accuracy and specificity are often analyzed with receiver operating curves (ROC). Here we study a related analysis of the data in terms of coverage–performance curves (CPC) which more clearly indicate the presence of ambiguous data in classification problems

Coverage-performance estimation for classification with ambiguous data

by unknown authors
"... Abstract. Classifier tradeoffs between accuracy and specificity are often analyzed with receiver operating curves (ROC). Here we study a related analysis of the data in terms of coverage–performance curves (CPC) which more clearly indicate the presence of ambiguous data in classification problems wi ..."
Abstract - Add to MetaCart
Abstract. Classifier tradeoffs between accuracy and specificity are often analyzed with receiver operating curves (ROC). Here we study a related analysis of the data in terms of coverage–performance curves (CPC) which more clearly indicate the presence of ambiguous data in classification problems

Joint Channel Assignment and Routing for Throughput Optimization in Multi-radio Wireless Mesh Networks

by Mansoor Alicherry , Randeep Bhatia , Li Erran Li , 2005
"... Multi-hop infrastructure wireless mesh networks offer increased reliability, coverage and reduced equipment costs over their singlehop counterpart, wireless LANs. Equipping wireless routers with multiple radios further improves the capacity by transmitting over multiple radios simultaneously using o ..."
Abstract - Cited by 443 (0 self) - Add to MetaCart
Multi-hop infrastructure wireless mesh networks offer increased reliability, coverage and reduced equipment costs over their singlehop counterpart, wireless LANs. Equipping wireless routers with multiple radios further improves the capacity by transmitting over multiple radios simultaneously using

Bad news travels slowly: Size, analyst coverage, and the profitability of momentum strategies

by Harrison Hong, Terence Lim, Jeremy C. Stein - Journal of Finance , 2000
"... Various theories have been proposed to explain momentum in stock returns. We test the gradual-information-diffusion model of Hong and Stein (1999) and establish three key results. First, once one moves past the very smallest stocks, the profitability of momentum strategies declines sharply with firm ..."
Abstract - Cited by 339 (25 self) - Add to MetaCart
with firm size. Second, holding size fixed, momentum strategies work better among stocks with low analyst coverage. Finally, the effect of analyst coverage is greater for stocks that are past losers than for past winners. These findings are consistent with the hypothesis that firm-specific information

Code Coverage, Performance Approximation and Automatic Recognition of Idioms in Scientific Applications

by Jiahua He, Allan E. Snavely, Rob F. Van Der Wijngaart, Michael A. Frumkin
"... Basic data flow patterns which we call idioms, such as stream, transpose, reduction, random access and stencil, are common in scientific numerical applications. We hypothesize that a small number of idioms can cover most programming constructs that dominate the execution time of scientific codes and ..."
Abstract - Add to MetaCart
and can be used to approximate the application performance. In this paper, we start with a manual analysis of code coverage on the NAS Parallel Benchmark (NPB) and find that five idioms suffice to cover 100 % of the NPB codes. We then compare the performance of our idiom benchmarks and their corresponding

Multiuser OFDM with Adaptive Subcarrier, Bit, and Power Allocation

by Cheong Yui Wong, Roger S. Cheng, Khaled Ben Letaief , Ross D. Murch - IEEE JOURNAL ON SELECTED AREAS OF COMMUNICATIONS , 1999
"... Multiuser orthogonal frequency division multiplexing (OFDM) with adaptive multiuser subcarrier allocation and adaptive modulation is considered. Assuming knowledge of the instantaneous channel gains for all users, we propose a multiuser OFDM subcarrier, bit, and power allocation algorithm to minimiz ..."
Abstract - Cited by 360 (3 self) - Add to MetaCart
to minimize the total transmit power. This is done by assigning each user a set of subcarriers and by determining the number of bits and the transmit power level for each subcarrier. We obtain the performance of our proposed algorithm in a multiuser frequency selective fading environment for various time

Application of Dimensionality Reduction in Recommender System -- A Case Study

by Badrul M. Sarwar , George Karypis, Joseph A. Konstan, John T. Riedl - IN ACM WEBKDD WORKSHOP , 2000
"... We investigate the use of dimensionality reduction to improve performance for a new class of data analysis software called "recommender systems". Recommender systems apply knowledge discovery techniques to the problem of making product recommendations during a live customer interaction. T ..."
Abstract - Cited by 323 (14 self) - Add to MetaCart
We investigate the use of dimensionality reduction to improve performance for a new class of data analysis software called "recommender systems". Recommender systems apply knowledge discovery techniques to the problem of making product recommendations during a live customer interaction
Results 1 - 10 of 8,056