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Clustering categorical data: An approach based on dynamical systems

by David Gibson, Jon Kleinberg, Prabhakar Raghavan , 1998
"... We describe a novel approach for clustering col-lections of sets, and its application to the analysis and mining of categorical data. By “categorical data, ” we mean tables with fields that cannot be naturally ordered by a metric- e.g., the names of producers of automobiles, or the names of prod-uct ..."
Abstract - Cited by 180 (1 self) - Add to MetaCart
We describe a novel approach for clustering col-lections of sets, and its application to the analysis and mining of categorical data. By “categorical data, ” we mean tables with fields that cannot be naturally ordered by a metric- e.g., the names of producers of automobiles, or the names of prod

Runtime power monitoring in high-end processors: Methodology and empirical data

by Canturk Isci, Margaret Martonosi , 2003
"... With power dissipation becoming an increasingly vexing problem across many classes of computer systems, measuring power dissipation of real, running systems has become crucial for hardware and software system research and design. Live power measurements are imperative for studies requiring execution ..."
Abstract - Cited by 199 (4 self) - Add to MetaCart
describe our technique for a coordinated measurement approach that combines real total power measurement with performance-counter-based, perunit power estimation. The resulting tool offers live total power measurements for Intel Pentium 4 processors, and also provides power breakdowns for 22 of the major

Clustering categorical data

by Yi Zhang, Ada Wai-chee Fu, Chun Hing Cai, Pheng Ann Heng - IN: PROC OF ICDE’00 , 2000
"... In this paper we propose two methods to study the problem of clustering categorical data. The first method is based on dynamical system approach. The second method is based on the graph partitioning approach. Dynamical systems approach for clustering categorical data have been studied by some author ..."
Abstract - Cited by 18 (0 self) - Add to MetaCart
In this paper we propose two methods to study the problem of clustering categorical data. The first method is based on dynamical system approach. The second method is based on the graph partitioning approach. Dynamical systems approach for clustering categorical data have been studied by some

Power and performance management of virtualized computing environments via lookahead control.

by Dara Kusic , Jeffrey O Kephart , James E Hanson , Nagarajan Kandasamy , Guofei Jiang , † J O Kephart , J E Hanson , ‡ D Kusic , N Kandasamy - In Proc. Fifth Int’l Conference on Autonomic Computing, , 2008
"... Abstract There is growing incentive to reduce the power consumed by large-scale data centers that host online services such as banking, retail commerce, and gaming. Virtualization is a promising approach to consolidating multiple online services onto a smaller number of computing resources. A virtu ..."
Abstract - Cited by 138 (6 self) - Add to MetaCart
conserves, on average, 22% of the power required by a system without dynamic control while still maintaining QoS goals. Finally, we use trace-based simulations to analyze controller performance on server clusters larger than our testbed, and show how concepts from approximation theory can be used to further

Efficient Synthesis of Physically Valid Human Motion

by Anthony C. Fang, Nancy S. Pollard , 2003
"... Optimization is a promising way to generate new animations from a minimal amount of input data. Physically based optimization techniques, however, are difficult to scale to complex animated characters, in part because evaluating and differentiating physical quantities becomes prohibitively slow. Tra ..."
Abstract - Cited by 117 (3 self) - Add to MetaCart
-iteration computation times and an optimization problem that appears to scale well to more complex characters. We show that qualities such as squash-and-stretch that are expected from physically based optimization result from our approach. Our animation system is particularly useful for synthesizing highly dynamic

Keyword Search over Dynamic Categorized Information

by Manish Bhide, Venkatesan T. Chakaravarthy, Krithi Ramamritham, Prasan Roy
"... Abstract — Consider an information repository whose content is categorized. A data item (in the repository) can belong to multiple categories and new data is continuously added to the system. In this paper, we describe a system, CS*, which takes a keyword query and returns the relevant top-K categor ..."
Abstract - Cited by 2 (1 self) - Add to MetaCart
-K categories. In contrast, traditional keyword search returns the top-K documents (i.e., data items) relevant to a user query. The need to dynamically categorize new data and also update the meta-data required for fast responses to user queries poses interesting challenges. The brute force approach of updating

Categorization of Underwater Habitats Using Dynamic Video Textures

by Jun Hu, Han Zhang, Anastasia Miliou, Thodoris Tsimpidis, Hazel Thornton, Vladimir Pavlovic
"... In this paper, we deal with the problem of categoriz-ing different underwater habitat types. Previous works on solving this categorization problem are mostly based on the analysis of underwater images. In our work, we design a system capable of categorizing underwater habitats based on underwater vi ..."
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of the Bag-of-Systems(BoSs). We also introduce a new underwater video data set, which is composed of more than 100 hours of annotated video sequences. Our results indicate that, for the underwater habitat identification, the dynamic texture approach has multiple benefits over the traditional STIP-based video

Spam filtering using statistical data compression models

by Andrej Bratko, Gordon V. Cormack, David R, Bogdan Filipič, Philip Chan, Thomas R. Lynam, Thomas R. Lynam - Journal of Machine Learning Research , 2006
"... Spam filtering poses a special problem in text categorization, of which the defining characteristic is that filters face an active adversary, which constantly attempts to evade filtering. Since spam evolves continuously and most practical applications are based on online user feedback, the task call ..."
Abstract - Cited by 72 (12 self) - Add to MetaCart
calls for fast, incremental and robust learning algorithms. In this paper, we investigate a novel approach to spam filtering based on adaptive statistical data compression models. The nature of these models allows them to be employed as probabilistic text classifiers based on character-level or binary

Categorization Using Semi-Supervised Clustering

by Jianying Hu, Moninder Singh, Aleksandra Mojsilovic - Proc. 19th ICPR , 2008
"... Many applications require matching objects to a predefined, yet highly dynamic set of categories accompanied by category descriptions. We present a novel approach to solving this class of categorization problems by formulating it in a semi-supervised clustering framework. Text-based matching is perf ..."
Abstract - Cited by 1 (1 self) - Add to MetaCart
Many applications require matching objects to a predefined, yet highly dynamic set of categories accompanied by category descriptions. We present a novel approach to solving this class of categorization problems by formulating it in a semi-supervised clustering framework. Text-based matching

Dumb money: Mutual fund flows and the cross section of stock returns,

by Andrea Frazzini , Owen A Lamont - Journal of Financial Economics, , 2008
"... We thank Nicholas Barberis and Judith Chevalier for helpful comments. We thank Breno Schmidt for research assistance. ABSTRACT We use mutual fund flows as a measure for individual investor sentiment for different stocks, and find that high sentiment predicts low future returns. Fund flows are dumb ..."
Abstract - Cited by 103 (4 self) - Add to MetaCart
by investors over time. For example, the growth/value category was not widely used in 1980. Instead, we impose no categorical structure on the data and just follow the flows. Most strikingly, we are able to document that the fund flow effect is highly related to the value effect, a finding that could not have
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