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Mining and analyzing digital archive usage data to support collection development decisions

Mining and analyzing digital archive usage data to support c...

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IEEE/ACM Joint conference on Digital Libraries(JCDL)

作者： Barry W. Boehm A. Winsor Lam Bo H. Lee Fenny Muliawan Genesan Kim Hsiao-han Huang Hui-hsien Chi Jeffrey Pearson Kristine Guevara Marie Chi Pei-han Li Shing-cheung Chan A. Winsor Brown Edward Colbert Mayur Patel Vu Nguyen Maks Krivokon Johan Bollen Jewel Ward University of Southern California Los Angeles CA USA Old Dominion University Norfolk VA USA

We demonstrate a collection development decision support tool that mines digital archive usage data. We want to better understand the University of Southern California (USC) Digital Archive's collection structure by analyzing the objects' characteristics, by analyzing the relationships between viewed objects, and by understanding usage trends over time. By relying on implicit patterns of usage data, such as co-retrievals, rather than explicit data, such as hit counts, we believe we can make more informed decisions about where to expend our resources

关键词： data mining Software libraries Algorithm design and analysis Graphics Web server data analysis databases visualization Clustering algorithms

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The visualization Platform of Virtual Prototype for Locomotive

The Visualization Platform of Virtual Prototype for Locomoti...

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Asian Simulation conference/The 6th International conference on system Simulation and Scientific Computing

作者： ZOU Yisheng, DING Guofu, ZHANG Weihua, GAO Zhaoxue, HE Yong (Advanced Design & Manufacturing Technology Research Institute, Southwest Jiaotong University, Chengdu Sichuan 610031, China The State Key Lab of Traction and Power, Southwest Jiaotong University, Chengdu Sichuan 610031, China)

analysis of multi-body system dynamics is the core content of Virtual Prototyping(VP) of mechanical system. Locomotive can be described as a multi-body system, here presents visualized VP developing platform. The virtual model was obtained from CAD system like CAXA, and the attributes of inertia, mass, etc., were extracted from features, parts and assemblies of CAD environment. The model with uniform format, which includes geometrical data and attribute data, was transmitted into the visualized platform of VP and was mapped into the topology structure of multi-body system of locomotive, in which the dynamics computing equations were constructed and the result was resolved and visualized. All of these were given in integrated visualized VP system named VPMS. A freight car model is built for testifying the system, which obeys the theory mentioned above. The simulating result shows that the platform is satisfying for the visualization of modeling and dynamics computation.

关键词： Virtual Prototype visualization Locomotive Multi-body system Topology

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Network simulation via hybrid system modeling: a time-stepped approach

Network simulation via hybrid system modeling: a time-steppe...

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International conference on Computer Communications and Networks (ICCCN)

作者： A. Kavimandan W. Lee M. Thottan A. Gokhale R. Viswanathan Department of EECS Vanderbilt University Nashville TN USA Bell Laboratories Lucent Technologies Inc. Murray Hill NJ USA

The ever increasing complexity of networks dramatically increases the challenges faced by service providers to analyze network behavior and (re)provision resources to support multiple complex distributed applications. Accurate and scalable simulation tools are pivotal to this cause. The recently proposed hybrid systems model for data communication networks shows promise in achieving performance characteristics comparable to fluid models while retaining the accuracy of discrete models. Using the hybrid systems paradigm, this paper provides contributions to the modeling of TCP behavior and the analysis/simulation of data communication networks based on these models. An important distinguishing feature of our simulation framework is a faithful accounting of link propagation delays which has been ignored in previous work for the sake of simplicity. Other salient aspects of the work include a new finite state machine model for a drop-tail queue, a new model for fast recovery/fast retransmit mode, a revised sending rate model, and an embedded time-out mode transition mechanism all of which employ a time-stepped solution method to solve the hybrid system network models. Our simulation results are consistent with well-known packet based simulators such as ns-2, thus demonstrating the accuracy of our hybrid model. Our future efforts will be directed towards studying and improving the computational performance of hybrid model based simulations.

关键词： Computational modeling Analytical models data communication IP networks Discrete event simulation Marine technology Propagation delay Automata visualization Performance analysis

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Regional quantitative analysis of cortical surface maps of FDG PET images

Regional quantitative analysis of cortical surface maps of F...

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IEEE Symposium on Nuclear Science (NSS/MIC)

作者： H.D. Protas P.M. Thompson K.M. Hayashi Chin-Lung Yu M. Bergsneider Sung-Cheng Huang Department of Biomathematics and Department of Molecular and Medical Pharmacology David Geffen School of Medicine Los Angeles CA USA Laboratory of Neuroimaging Department of Neurology David Geffen School of Medicine Los Angeles CA USA Department of Molecular and Medical Pharmacology David Geffen School of Medicine Los Angeles CA USA Division of Neurosurgery Brain Injury Research Center David Geffen School of Medicine Los Angeles CA USA

Cortical surface maps are advantageous for visualizing the 3D profile of cortical gray matter development and atrophy, and for integrating structural and functional images. In addition, cortical surface maps for PET data, when analyzed in conjunction with structural MRI data allow us to investigate, and correct for, partial volume effects. Here we compared quantitative regional PET values based on a 3D cortical surface modeling approach with values obtained directly from the 3D FDG PET images in various atlas-defined regions of interest (ROIs; temporal, parietal, frontal, and occipital lobes). FDG PET and 3D MR (SPGR) images were obtained and aligned to ICBM space for 15 normal subjects. Each image was further elastically warped in 2D parameter space of the cortical surface, to align major cortical sulci. For each point within a 15 mm distance of the cortex, the value of the PET intensity was averaged to give a cortical surface map of FDG uptake. The average PET values on the cortical surface map were calculated for each cortical point in a lobe, and were compared to those obtained by averaging across the entire ROIs on the 3D PET image directly. The average regional values obtained from the cortical surface map were found to match well with those taken directly from the 3D PET images. The results demonstrate that cortical surface maps of FDG PET images give accurate quantitative information on regional brain function, in addition to offering an improved visualization.

关键词： Image analysis Positron emission tomography Biomedical imaging Surface morphology data analysis data visualization Atrophy Magnetic resonance imaging Brain injuries Laboratories

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An Efficient Solution to Factor Drifting Problem in the pLSA Model

An Efficient Solution to Factor Drifting Problem in the pLSA...

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International conference on Computer and Information Technology (CIT)

作者： Liang Zhang Chaoran Li Yanfei Xu Baile Shi Department of Computing and Information Technology Fudan University Shanghai China

ISBN: (纸本)076952432X

Probabilistic latent semantic analysis (pLSA) is a powerful statistical technique to analyze relation between factors in dyadic data. Although various pLSA-based applications, ranging from information retrieval, information filtering, to text-mining and visualization, have been successfully conducted, they can not afford dynamic revising of model when one of the factors changes constantly. In this paper, we take the advantage of decoupling ability of pLSA thoroughly, and propose a more elegant approach based on maximum likelihood estimation to gain an incremental learning with the drift of a factor. We demonstrate our method in the context of collaborative filtering where single user interests change fast, but the community interests remain almost constant. Experiments against the MovieLens and EachMovie data sets reveal that the proposed method improves the recommending accuracy 10% further beyond the original pLSA at a less computation cost

关键词： Information filtering Collaboration Information filters Information technology Information analysis Information retrieval Maximum likelihood estimation Computational efficiency Pattern analysis Chaos

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Building an Adaptive Hierarchy of Clusters for Text data

Building an Adaptive Hierarchy of Clusters for Text Data

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International conference on Computational Intelligence for Modelling, Control and Automation, and International conference on Intelligent Agents, Web Technologies and Internet Commerce

作者： Shan Chen D. Alahakoon M. Indrawan Monash University Australia

Text clustering has been recognized as an important component in Web-based applications. Clustering data on a hierarchical structure enables exploring data on different levels of granularity, providing a more intuitive view that is close to the way humans view the world. Self-organizing map (SOM) based models have been found to have certain advantages for clustering sizeable text data. However, current existing approaches lack in providing an adaptive hierarchical structure within in a single model. This paper proposes an unsupervised hierarchical clustering approach based on the growing self-organizing map (GSOM). By utilizing GSOM's spread factor, our approach offers an adaptive architecture with the capability of detecting necessary layers to form a hierarchy, avoiding a number of issues that a traditional top-down or bottom-up hierarchical clustering approach often encounter. Experiment has shown that this approach has the potential for efficiently clustering heterogeneous text data

关键词： Neural networks Humans Information technology Text recognition data analysis Network topology visualization

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A study of analyzing network traffic as images in real-time

A study of analyzing network traffic as images in real-time

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IEEE Annual Joint conference: INFOCOM, IEEE Computer and Communications Societies

作者： Seong Soo Kim A.L.N. Reddy Department of Electrical Engineering Texas A and M University College Station TX USA

This paper presents NetViewer, a network measurement approach that can simultaneously detect, identify and visualize attacks and anomalous traffic in real-time by passively monitoring packet headers. We propose to represent samples of network packet header data as frames or images. With such a formulation, a series of samples can be seen as a sequence of frames or video. This enables techniques from image processing and video compression to be applied to the packet header data to reveal interesting properties of traffic. We show that "scene change analysis" can reveal sudden changes in traffic behavior or anomalies. We also show that "motion prediction" techniques can be employed to understand the patterns of some of the attacks. We show that it may be feasible to represent multiple pieces of data as different colors of an image enabling a uniform treatment of multidimensional packet header data. We compare NetViewer with classical detection theory based Neyman-Pearson test and an IDS tool.

关键词： Image analysis Telecommunication traffic Video compression data visualization Monitoring Image processing Layout Multidimensional systems Testing Intrusion detection

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A statistical approach to gait recognition and verification by using cyclograms

A statistical approach to gait recognition and verification ...

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IEE International conference on Visual Information Engineering (VIE 2005)

作者： YingLiang Ma Frank E. Pollick Martin Turner Psychology Department University of Glasgow U.K. Manchester Visualization Centre University of Manchester U.K.

The cyclogram of human gait uncovers the relationship between thigh and knee motion. Because it is believed to be invariant for the walking pattern of the same person it leads to a better understanding of gait. If we use it as the signature in gait recognition and verification, it could lead to an automatic person recognition system using video footage from security cameras. The body contours are extracted by image subtraction and edge detection and rotation angles of thigh and lower leg are derived by regression analysis. Then we apply a weighted moving average and a low-pass filter to smooth the angle data. Cyclograms are generated as the thigh angle vs. knee angle and are fitted by non-uniform B-Spline curves. To compare the signatures between two gaits, the differences of shape and phase of the cyclogram are calculated using the point projection method and extreme points of curves. Finally, classification is done via the k-nearest classifier and cross-validation with the leave-one-out rule.

关键词： Splines (mathematics) Knee Thigh Legged locomotion databases Shape Fitting

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Advance reservation and co-allocation protocol for grid computing

Advance reservation and co-allocation protocol for grid comp...

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IEEE International conference on e-Science and Grid Computing

作者： K.M. Mckeown School of Computer Science The University of Manchester Manchester UK

This paper specifies an advance reservation and co-allocation protocol for grid computing, and a simple framework for supporting well defined charging models. The protocol supports arbitrary level of nesting, that is a reservation may be to a virtual resource (a set of resources). The work is motivated by the need for advance reservation in the RealityGrid project. However the protocol is a generic protocol that can reserve any type of resource (e.g. clusters, network, and storage) and for any grid project where users need to reserve one or more resources in advance

关键词： Protocols Grid computing Computational modeling Supercomputers Books Computer science visualization Telescopes data analysis Delay

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A haptic interaction technique for volume images based on gradient diffusion

A haptic interaction technique for volume images based on gr...

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World Haptics conference

作者： E. Vidholm I. Nystrom Centre for Image Analysis University of Uppsala Uppsala Sweden

The manual step in semi-automatic segmentation of medical volume images typically involves initialization procedures such as placement of seed-points or positioning of surface models inside the object to be segmented. The initialization is then used as input to an automatic algorithm. We investigate how such initialization tasks can be facilitated by using haptic feedback. This paper describes a haptic interaction technique based on gradient vector flow (GVF) that allows a user to stay centered inside the object while still feeling the object boundaries. Our method is not limited to elongated structures, which is a common restriction for other approaches. Initial tests of the method show encouraging results for differently shaped objects.

关键词： Haptic interfaces Image segmentation Rendering (computer graphics) Feedback Image analysis Biomedical imaging Medical diagnostic imaging data visualization Surgery Magnetic resonance imaging

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