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A computational topology approach to automatic partition and visualization of oceanic water masses

A computational topology approach to automatic partition and...

引用

10th International conference on Computer-Aided Design and Computer Graphics

作者： Yang, Guan-Jie Wu, Ke-Qin Guan, Qian-Qian Hong, Lin Beijing Normal Univ Sch Management Zhuhai Peoples R China Ocean Univ China Dept Comp Sci Qingdao 266071 Peoples R China

ISBN: (纸本)9781424415786

This paper addresses the issue of precisely locating boundaries of water masses in the oceanic water mass analysis. A novel computational topology-based solution is presented. First, employing the concept of multidimensional transfer functions, the sampled data of temperature and salinity in investigated area are transformed into a feature function of water masses that represents the variation ratio distribution of temperature and salinity on the domain. Then, a 2-manifold Morse-Smale decomposition over this domain is made to produce boundaries among the different water masses automatically. The results of some comparative experiments verified effectiveness and objectivity of the presented method, and its much better accuracy and efficiency.

关键词： Topology

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Development of a model-based digital and visual wheat growth system

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1st International conference on Computer and Computing Technologies in Agriculture (CCTA 2007)

作者： Tang, Liang Liu, Hui Zhu, Yan Cao, Weixing Nanjing Agr Univ Hightech Key Lab Informat Agr Nanjing 210095 Jiangsu Peoples R China

ISBN: (纸本)9780387772523

Driven by soil, variety, weather and management databases and integrating process-based growth simulation model, morphological model and visualization model, a model-based digital and visual wheat growth system (MDVWGS) was developed using component-based software and visualization techniques. The system was programmed by the Net framework with the language of C# and CsGL Library was used for realizing 2D and 3D graphics application and visualization. The implemented system could be used for predicting growth processes and visualizing morphological architecture of wheat plant under various environments, genotypes and management strategies, and has the functions as data management, dynamic simulation, strategy evaluation, real-time prediction, temporal and spatial analysis,visualization output, expert consultation and system help. The MDVWGS should be useful for construction and application of digital farming system and provide a precise and scientific tool for cultivar design, cultural regulation and productivity evaluation under different growing conditions.

关键词： wheat growth model morphological model functional-structural plant model visualization

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Adaptive fuzzy segmentation of tumors in three-dimensional computed tomography (CT) image data

Adaptive fuzzy segmentation of tumors in three-dimensional c...

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ASME International Design Engineering Technical conferences/Computers and Information in Engineering conference

作者： Foo, Jung Leng Miyano, Go Lobe, Thom Winer, Eliot Iowa State Univ Virtual Real Applicat Ctr Dept Mech Engn Ames IA 50011 USA

ISBN: (纸本)9780791848036

The continuing advancement of computed tomography (CT) technology has improved the analysis and visualization of tumor data. As imaging technology continues to accommodate the need for high quality medical image data, this encourages the research for more efficient ways of extracting crucial information from these vast amounts of data. A new segmentation method using a fuzzy rule based system to segment tumors in a three-dimensional CT data has been developed. To initialize the segmentation process, the user selects the region of interest (ROI) within the tumor in the first image of the CT study set. Using the ROI's spatial and intensity properties, fuzzy inputs are generated for use in the fuzzy inference system. From a set of predefined fuzzy rules, the system generates a defuzzified output for every pixel in tern-is of similarity to the object. Pixels with the highest similarity values are selected to be the tumor. This process is repeated for every subsequent slice in the CT set, and the segmented region from the previous slice is used as the ROI for the current slice. This creates a propagation of information from the previous slices, to be used to segment the current slice. The membership functions used during the fuzzification and defuzzification processes are adaptive to the changes in the size and pixel intensities of the current ROI. The proposed method is highly customizable to suit different needs of a user, requiring information from only a single two-dimensional image. Implementing the fuzzy segmentation on two distinct CT sets, the fuzzy segmentation algorithm was able to successfully extract the tumor from the CT image data. Based on the results statistics, the developed segmentation technique is approximately 96% accurate when compared to the results of manual segmentations performed.

关键词： Tumors

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Flexible Multichannel System for Bioelectrical Fields analysis 11th

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11th Mediterranean conference on Medical and Biological Engineering and Computing (MEDICON 2007)

作者： Kneppo, P. Tysler, M. Hana, K. Smrcka, P. Rosik, V. Karas, S. Heblakova, E. Czech Tech Univ Fac Biomed Engn Nam Sitna 3105 Kladno 27201 Czech Republic Slovak Acad Sci Inst Measurement Sci Bratislava Slovakia

ISBN: (纸本)9783540730439

Powerful multichannel system for measurement of surface biosignals is introduced and its use for cardiac electric field mapping is presented. The system can use up to 128 active electrodes;active neutralization of the patient and battery-powered operation facilitates optimal signal quality. Amplification and measuring unit containing ADSP-BF537 processor with embedded network connectivity enables easy wired or wireless connection to the host personal computer. Measurement and data analysis PC software based on the NET platform enables fast high-resolution multichannel measurement, processing and visualization of surface bioelectrical fields. Another application enables noninvasive identification of local ischemia using measured QRST integral maps and model of the patient's torso.

关键词： DSP based measuring system Ethernet connectivity biosignal measurement body surface potential mapping noninvasive ischemia identification

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Challenges of evaluating the Information Visualisation experience

Challenges of evaluating the Information Visualisation exper...

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21st British HCI Group Annual conference: People and Computers XXI HCI.But Not as We Know It, HCI 2007

作者： Faisal, Sarah Cairns, Paul Blandford, Ann Remax House 31/32 Alfred Place London WC1 E7DP United Kingdom

ISBN: (纸本)9781902505954

Information Visualisation (InfoVis) is defined as an interactive visual representation of abstract data. We view the user's interaction with InfoVis tools as an experience which is made up of a set of highly demanding cognitive activities. These activities assist users in making sense and gaining knowledge of the represented domain. Usability studies that involve a task-based analysis and usability questionnaires are not enough to capture such an experience. This paper discusses the challenges involved when it comes to evaluating InfoVis tools by giving an overview of the activities involved in an InfoVis experience and demonstrating how they affect the visualisation process. The argument in this paper is based on our experiences in designing, building and evaluating an academic literature visualisation tool. © 2007 Sarah Faisal, Paul Cairns, Ann Blandford.

关键词： visualization

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Extracting Separation Surfaces of Path Line Oriented Topology in Periodic 2D Time-Dependent Vector Fields

Extracting Separation Surfaces of Path Line Oriented Topolog...

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15th International conference in Central Europe on Computer Graphics, visualization and Computer Vision

作者： Shi, Kuangyu Theisel, Holger Weinkauf, Tino Hauser, Helwig Hege, Hans-Christian Seidel, Hans-Peter MPI Informat D-66123 Saarbrucken Germany

ISBN: (纸本)9788086943008

This paper presents an approach to extracting the separation surfaces from periodic 2D time-dependent vector fields based on a recently introduced path line oriented topology. This topology is based on critical path lines which repeat the same spatial cycle per time period. Around those path lines there are areas of similar asymptotic flow behavior (basins) which are captured by a 2D Poincare map as a discrete dynamical system. Due to pseudo discontinuities in this map and the discrete integration scheme, separatrices between the basins can't be obtained as integral curves. Instead we choose a point-wise approach to segment the Poincare map and apply image analysis algorithms to extract the 2D separation curves. Starting from those curves we integrate separation surfaces which partition the periodic 2D time-dependent vector field into areas of similar path line behavior. We apply our approach to a number of data sets to demonstrate its utility.

关键词： Flow visualization Time-dependent vector fields Topological methods

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ICQR 2007 - Proceedings of the 5th International conference on Quality and Reliability

ICQR 2007 - Proceedings of the 5th International Conference ...

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5th International conference on Quality and Reliability, ICQR 2007

ISBN: (纸本)9789810594046

The proceedings contain 83 papers. The topics discussed include: untangling leadership and management: the first step to ensuring quality attainment in organizations;the impacts of economic long-term expansion and consumer confidence on perceived value and customer satisfaction;concurrent engineering framework for quality and reliability at initial design stage;reliability improvements in aircraft maintenance planning and scheduling under uncertainty;number-dependent replacement model with random lead-time under maintenance continuously;an integrated DEA framework for assessment and ranking of manufacturing systems based on equipment performance;a generalized maintenance policy for a system subject to shocks under periodic overhaul;economic carbon fibers process planning: statistical modeling approach;multi criteria quality assessment of products by integrated DEA-PCA approach;and a simple visualization technique for the analysis of failure rates in warranty data.

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Imaging vasculature independent of direction of flow using spectral domain optical coherence tomography

Imaging vasculature independent of direction of flow using s...

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conference Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine XI

作者： Fingler, J. Williams, J. Yang, C. Fraser, S. E. CALTECH Pasadena CA 91125 USA

ISBN: (纸本)9780819465429

A variation to the analysis of phase data achieved with spectral domain optical coherence tomography (SDOCT) is presented. By using the variance of the phase changes observed in the OCT images, scatterer motion has been imaged which is not readily observable with conventional Doppler OCT techniques. Dynamic motion contrast has been demonstrated for imaging Brownian motion of a sample system as well as imaging vasculature of in vivo 3dpf zebrafish.

关键词： Optical coherence tomography Phase measurement Phase contrast Signal to noise ratio Motion measurement Imaging systems Doppler effect visualization Error analysis Interference (communication)

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Second International conference on Internet Monitoring and Protection, ICIMP 2007

Second International Conference on Internet Monitoring and P...

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2nd International conference on Internet Monitoring and Protection, ICIMP 2007

ISBN: (纸本)0769529119

The proceedings contain 42 papers. The topics discussed include: enriched diagnosis and investigation models for security event correlation;BTM-an automated rule-based BT monitoring system for piracy detection;an investigation of cybercrime-related online search behaviors vs general search behavior;large scale activity monitoring for distributed honeynets;visualization of network traffic using dynamic co-occurrence matrices;a comparison of SYN flood detection algorithms;a management platform for tracking cyber predators in peer-to-peer networks;fraud/privacy protection in anonymous auction;emergency alerts as RSS feeds with interdomain authorization;performance analysis in IP over WDM networks;protocol to support multi-domain auditing of internet-based transport services;efficient probing techniques for fault diagnosis;non-repudiable service usage with host identities;and a model supporting business continuity auditing and planning in information systems.

关键词： Security of data

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analysis of the MPI-IO optimization levels with the PIOViz jumpshot enhancement

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14th EuroPVM/MPI conference

作者： Ludwig, Thomas Krempel, Stephan Kuhn, Michael Kunkel, Julian Lohse, Christian Ruprecht Karls Univ Heidelberg D-69120 Heidelberg Germany

ISBN: (纸本)9783540754152

With MPI-IO we see various alternatives for programming file I/O. The overall program performance depends on many different factors. A new trace analysis environment provides deeper insight into the client/server behavior and visualizes events of both process types. We investigate the influence of making independent vs. collective calls together with access to contiguous and non-contiguous data regions in our MPI-IO program. Combined client and server traces exhibit reasons for observed I/O performance.

关键词： parallel I/O MPI-IO performance visualization Trace-Based tools

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