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Combinatorial agency 06

Combinatorial agency

引用

7th ACM Conference on Electronic Commerce

作者： Babaioff, Moshe Feldman, Michal Nisan, Noam School of Information Management and Systems UC Berkeley Berkeley CA 94720 United States School of Engineering and Computer Science Hebrew University of Jerusalem Jerusalem 91904 Israel

ISBN: (纸本)1595932364

Much recent research concerns systems, such as the Internet, whose components are owned and operated by different parties, each with his own "selfish" goal. The field of Algorithmic Mechanism Design handles the issue of private information held by the different parties in such computational settings. This paper deals with a complementary problem in such settings: handling the "hidden actions" that are performed by the different parties. Our model is a combinatorial variant of the classical principal-agent problem from economic theory. In our setting a principal must motivate a team of strategic agents to exert costly effort on his behalf, but their actions are hidden from him. Our focus is on cases where complex combinations of the efforts of the agents influence the outcome. The principal motivates the agents by offering to them a set of contracts, which together put the agents in an equilibrium point of the induced game. We present formal models for this setting, suggest and embark on an analysis of some basic issues, but leave many questions open. Copyright 2006 ACM.

关键词： Electronic commerce

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PmEB: A mobile phone application for monitoring caloric balance

PmEB: A mobile phone application for monitoring caloric bala...

引用

Conference on Human Factors in Computing Systems, CHI EA 2006

作者： Lee, Gunny Tsai, Chris Griswold, William G. Raab, Fred Patrick, Kevin Computer Science and Engineering UC San Diego 9500 Gilman Dr. San Diego CA 92093 United States PACE Group UC San Diego 9500 Gilman Dr. San Diego CA 92093 United States

ISBN: (纸本)1595932984

In this paper, we present PmEB, an application for mobile phones that allows users to monitor their caloric balance as a part of weight management. PmEB allows users to track their caloric balance by recording food intake and physical activity on their mobile phones. Daily reminder messages are sent via SMS messages to encourage compliance. Collected data is sent automatically every 24 hours to a central server where it can be analyzed in detail. PmEB was designed as a tool for both users to self-monitor and manage their food consumption and physical activity and primary health care providers to study behavioral patterns in overweight patients. Formative evaluation with seven health-intervention experts and a week-long user study with six clinically overweight, non-expert participants have shown PmEB to have promising potential for improving self-efficacy in dietary and exercise behavior.

关键词： Cellular telephones

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Graph laplacian regularization for large-scale semidefinite programming 06

Graph laplacian regularization for large-scale semidefinite ...

引用

Proceedings of the 20th International Conference on Neural Information Processing Systems

作者： Kilian Q. Weinberger Fei Sha Qihui Zhu Lawrence K. Saul Dept of Computer and Information Science U of Pennsylvania Philadelphia PA Computer Science Division UC Berkeley CA Dept of Computer Science and Engineering UC San Diego La Jolla CA

In many areas of science and engineering, the problem arises how to discover low dimensional representations of high dimensional data. Recently, a number of researchers have converged on common solutions to this problem using methods from convex optimization. In particular, many results have been obtained by constructing semidefinite programs (SDPs) with low rank solutions. While the rank of matrix variables in SDPs cannot be directly constrained, it has been observed that low rank solutions emerge naturally by computing high variance or maximal trace solutions that respect local distance constraints. In this paper, we show how to solve very large problems of this type by a matrix factorization that leads to much smaller SDPs than those previously studied. The matrix factorization is derived by expanding the solution of the original problem in terms of the bottom eigenvectors of a graph Laplacian. The smaller SDPs obtained from this matrix factorization yield very good approximations to solutions of the original problem. Moreover, these approximations can be further refined by conjugate gradient descent. We illustrate the approach on localization in large scale sensor networks, where optimizations involving tens of thousands of nodes can be solved in just a few minutes.

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Identifying Color in Motion in Video Sensors

Identifying Color in Motion in Video Sensors

引用

Conference on computer Vision and Pattern Recognition (CVPR)

作者： Gang Wu A. Rahimi E.Y. Chang Kingshy Goh T. Tsai Ankur Jain Yuan-Fang Wang Electrical and Computer Engineering UC Santa Barbara CA Proximex Inc Cupertino CA Computer Science UC Santa Barbara CA Intel Inc Santa Clara CA

Identifying or matching the surface color of a moving object in surveillance video is critical for achieving reliable object-tracking and searching. Traditional color models provide little help, since the surface of an object is usually not flat, the object’s motion can alter the surface’s orientation, and the lighting conditions can vary when the object moves. To tackle this research problem, we conduct extensive data mining on video clips collected under various lighting conditions and distances from several video-cameras. We observe how each of the eleven culture colors can drift in the color space when an object’s surface is in motion. In the color space, we then learn the drift pattern of each culture color for classifying unseen surface colors. Finally, we devise a distance function taking color drift into consideration to perform color identification and matching. Empirical studies show our approach to be very promising: achieving over 95% color-prediction accuracy.

关键词： Cameras Lighting Surveillance Colored noise Clothing Light sources Optical reflection computer science Data mining Shape

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Theory of fermi level pinning of high-k dielectrics

Theory of fermi level pinning of high-k dielectrics

引用

2006 International Conference on Simulation of Semiconductor Process and Devices, SISPAD '06

作者： Shiraishi, Kenji Akasaka, Yasushi Umezawa, Naoto Nara, Yasuo Yamada, Keisaku Takeuchi, Hideki Watanabe, Heiji Chikyow, Toyohiro Liu, Tsu-Jae King Graduate School of Pure and Applied Physics University of Tsukuba Tsukuba Ibaraki Japan Semiconductor Leading Edge Inc. Tokyo Electron Ltd. Tsukuba Ibaraki Japan Advanced Electronic Materials Center National Institute for Materials Science Tsukuba Ibaraki Japan Semiconductor Leading Edge Inc. Tsukuba Ibaraki Japan Nanotechnology Laboratories Waseda University Shinjuku Tokyo Japan ATDF Inc. UC Berkeley Austin TX United States Graduate School of Engineering Osaka University Suita Osaka Japan Department of Electrical Engineering and Computer Science University of California at Berkeley Berkeley CA United States

ISBN: (纸本)1424404045

Fermi-level pinning of poly-Si and metal-silicide gate materials on Hf-based gate dielectrics has been systematically studied theoretically. Fermi-level pinning in high-work-function materials is governed by the O vacancy generation and subsequent formation of interface dipoles near gate electrodes due to the electron transfer. On the other hand, O interstitial formation plays a crucial role for Fermi-level pinning in low-work-function materials. From our theoretical considerations, we have found that the work-function pinning-free-region generally appears due the difference in the mechanism of Fermi-level pinning of high- and low-work-function materials. The widening of this work-function pinning-free-region is the key issue for the fundamental relaxation of Fermi-level pinning in high-k gate dielectric. © 2006 IEEE.

关键词： Dielectric materials

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A cross-layer approach for power-performance optimization in distributed mobile systems

A cross-layer approach for power-performance optimization in...

引用

19th IEEE International Parallel and Distributed Processing Symposium, IPDPS 2005

作者： Mohapatra, Shivajit Cornea, Radu Oh, Hyunok Lee, Kyoungwoo Kim, Minyoung Dutt, Nikil Gupta, Rajesh Nicolau, Alex Shukla, Sandeep Venkatasubramanian, Nalini School of Information and Computer Science UC Irvine Department of Computer Science and Engineering UC San Diego Department of Electrical and Computer Engineering Virginia Tech.

ISBN: (纸本)0769523129

The next generation of mobile systems with multimedia processing capabilities and wireless connectivity will be increasingly deployed in highly dynamic and distributed environments for multimedia playback and delivery (e.g. video streaming, multimedia conferencing). The challenge is to meet the heavy resource demands of multimedia applications under the stringent energy, computational, and bandwidth constraints of mobile systems, while constantly adapting to the global state changes of the distributed environment. In this paper, we present our initiatives under the FORGE framework to address the issue of delivering high quality multimedia content in mobile environments. In order to cope with the resource intensive nature of multimedia applications and dynamically changing global state (e.g. node mobility, network congestion), an end-to-end approach to QoS aware power optimization is required. We present a framework for coordinating energy optimizing strategies across various layers of system implementation and functionality and discuss techniques that can be employed to achieve energy gains for mobile multimedia systems.

关键词： Distributed computer systems

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Manifold learning, A promised land or work in progress?

Manifold learning, A promised land or work in progress?

引用

IEEE International Conference on Multimedia and Expo, ICME 2005

作者： Yeh, Mei-Chen Lee, I.-Hsiang Wu, Gang Wu, Yi Chang, Edward Y. Department of Electrical and Computer Engineering UC Santa Barbara Department of Computer Science UC Santa Barbara

ISBN: (纸本)0780393325

Tasks of image clustering and classification often deal with data of very high dimensions. To alleviate the dimensionality curse, several methods, such as Isomap, LLE and KPCA, have recently been proposed and applied to learn low-dimensional, non-linear embedded manifolds in high-dimensional spaces. Unfortunately, the scenarios in which these methods appear to be effective are very contrived. In this work, we empirically examine these methods on a realistic but not-so-difficult dataset. We discuss the promises and limitations of these dimensionreduction schemes. © 2005 IEEE.

关键词： Learning systems

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EXTENT: Inferring image metadata from context and content

EXTENT: Inferring image metadata from context and content

引用

IEEE International Conference on Multimedia and Expo, ICME 2005

作者： Tsai, Chang-Ming Qamra, Arun Chang, Edward Y. Wang, Yuan-Fang Department of Electrical and Computer Engineering UC Santa Barbara Department of Computer Science UC Santa Barbara

ISBN: (纸本)0780393325

We present EXTENT, an image annotation system that combines the context and content information to annotate images with metadata that cannot be reliably inferred from either the context or the content alone. EXTENT first applies contextual information for restricting the search scope in an image database and reducing the complexity of ensuing content analysis. It can then afford to use more expensive (hence more robust) algorithms for performing content analysis within the restricted database scope. Our experiments show that effectively combining content with context information can infer metadata with high accuracy. © 2005 IEEE.

关键词： Image analysis

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What do students know? An outcomes-based assessment system 05

What do students know? An outcomes-based assessment system

引用

1st International Computing Education Research Workshop, ICER 2005

作者： Winters, Titus Payne, Tom UC Riverside Computer Science and Engineering Riverside CA 92521

ISBN: (纸本)1595930434

Well-run organizations collect, archive and analyze data relating to the effectiveness of their important processes. Educational institutions discard a wealth of student scores that could be analyzed. Each score contains important information about the student as well as the item (i.e., problem or question). This paper describes our project to develop an outcomes-based assessment system that mines per-item scores to track each student's skills and knowledge. Statistical inference techniques from both educational statistics and data, mining will quantitatively determine each student's acquired competency, with minimal input from faculty. The culmination of item-level assessment gives individual faculty feedback on their courses, and gives curriculum committees feedback on which objectives are sufficiently met by their respective curricula. Copyright 2005 ACM.

关键词： Students

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3rd International Conference on Formal Modeling and Analysis of Timed Systems, FORMATS 2005

作者： Henzinger, Thomas A. Majumdar, Rupak Prabhu, Vinayak S. Department of Computer and Communication Sciences EPFL Department of Computer Science UC Los Angeles Department of Electrical Engineering and Computer Sciences UC Berkeley

ISBN: (纸本)3540309462

We define quantitative similarity functions between timed transition systems that measure the degree of closeness of two systems as a real, in contrast to the traditional boolean yes/no approach to timed simulation and language inclusion. Two systems are close if for each timed trace of one system, there exists a corresponding timed trace in the other system with the same sequence of events and closely corresponding event timings. We show that timed CTL is robust with respect to our quantitative version of bisimilarity, in particular, if a system satisfies a formula, then every close system satisfies a close formula. We also define a discounted version of CTL over timed systems, which assigns to every CTL formula a real value that is obtained by discounting real time. We prove the robustness of discounted CTL by establishing that close states in the bisimilarity metric have close values for all discounted CTL formulas. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Time varying systems

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