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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...

引用

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

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

引用

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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The GIS system for the Yunnan soil quality data management and analysis

The GIS system for the Yunnan soil quality data management a...

引用

International conference on Environmental Science and Information Application Technology, ESIAT

作者： Liu Liu Yufeng Zhang Panhua Ma Sicong Liu Wen Lu Electronic Engineering Department School of Infonnation Science and Engineering Yunnan University Kunming China

Soil is one of the fundamental elements of human life. However, the growing situation of soil pollution has threatened the ecological balance of terrestrial animals and plants. In order to protect the soil environment, Yunnan Province launched a province-wide soil pollution survey. Until now the statistics and evaluation procession of the sample data has been implemented and a series of valuable results have been obtained. Based on Visual Studio as development platform, ArcEngine as embedded development component, C# as the developing language, SQL Server 2005 as the database, a system is set up to reveal the spatial relationship, distribution patterns and development trends among these results. It provides the functions of information input, maintenance, retrieval, spatial analysis, thematic mapping, etc... By using this system, the integrated management and correlation between the spatial and attribute information are demonstrated in visualization method.

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Building an Adaptive Hierarchy of Clusters for Text data

Building an Adaptive Hierarchy of Clusters for Text Data

引用

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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Feature identification: a novel approach and a case study

Feature identification: a novel approach and a case study

引用

International conference on Software Maintenance (ICSM)

作者： G. Antoniol Y.-G. Gueheneuc RCOST University of Sannio Italy Départment de Génie Informatique École Polytechnique de Montréal Canada

Feature identification is a well-known technique to identify subsets of a program source code activated when exercising a functionality. Several approaches have been proposed to identify features. We present an approach to feature identification and comparison for large object-oriented multi-threaded programs using both static and dynamic data. We use processor emulation, knowledge filtering, and probabilistic ranking to overcome the difficulties of collecting dynamic data, i.e., imprecision and noise. We use model transformations to compare and to visualise identified features. We compare our approach with a naive approach and a concept analysis-based approach using a case study on a real-life large object-oriented multi-threaded program, Mozilla, to show the advantages of our approach. We also use the case study to compare processor emulation with statistical profiling.

关键词： Computer aided software engineering Object oriented modeling Software maintenance Emulation Filtering Performance analysis data structures Uniform resource locators visualization Software performance

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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

引用

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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Digitalization of coastal management and decision making supported by multi-dimensional geospatial information and analysis 05

Digitalization of coastal management and decision making sup...

引用

Proceedings of the 2005 national conference on Digital government research

作者： Ron Li Keith Bedford C. K. Shum Xutong Niu Feng Zhou Vasilia Velissariou J. Raul Ramirez Aidong Zhang The Ohio State University Columbus OH University at Buffalo Buffalo NY

This paper presents the status and outcomes of the fourth year of an NSF-funded Digital Government Program project. During this four-year period, geo-spatial technologies have been investigated and developed to enhance the operational capabilities of federal, state, and local agencies responsible for coastal management and decision making. Successful collaborations have been established among research laboratories and government agencies in the areas of data collection and analysis, hydrodynamic modeling, development of web-based systems, and real-world applications of research results.

关键词： 3D visualization

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Choosing an Accurate Network Model using Domain analysis

Choosing an Accurate Network Model using Domain Analysis

引用

International conference on Parallel and Distributed Systems (ICPADS)

作者： A. Konrad B.Y. Zhao A.D. Joseph Mills College UC-Santa Barbara UC-Berkeley

Network link simulation is perhaps the most common method for evaluating application and network protocol designs. In modeling realistic networks, researchers face measurements whose characteristics experience non-stationarity (time variability) and complex patterns due to a number of factors, including both internal network elements and external events. In this paper we introduce a methodology we call domain analysis to quantify the accuracy of different models, and show how to use it to choose the best model for a given set of network characteristics. Our work seeks to aid network and application protocol developers in developing and choosing appropriate models for network simulation. We introduce our data preconditioning methodology for modelling non-stationary datasets, and present the new multiple states MTA model (MMTA). We show that it is better in capturing error burst statistics than classical models and more consistently accurate across different networks that our previous MTA model

关键词： Hidden Markov models Protocols Error correction Automatic repeat request Milling machines Educational institutions Time measurement data mining Digital audio players data visualization

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Advance reservation and co-allocation protocol for grid computing

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

引用

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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UsCaAb : a tool for abstracting use case diagrams

UsCaAb : a tool for abstracting use case diagrams

引用

(CSMR) European conference on Software Maintenance and Reengineering

作者： M.L. Bernardi G.A. Di Lucca RCOST Research Centre on Software Technology Department of Engineering University of Sannio Benevento Italy

The Use Case Abstractor (UsCaAb) tool automatically recovers use case diagrams from C++ and Java software systems. The target system is represented by the E-M-M graph; hence this graph is analysed to identify groups of related components implementing the use-cases and the relationships among them. The aim of the tool is to provide software engineers with a useful and extensible environment supporting program comprehension, software maintenance and testing tasks.

关键词： Computer aided software engineering Software maintenance data mining Information analysis Java Software systems Software tools Computer architecture Software libraries visualization

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