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PBTree - A new progressive and hierarchical representation for network-based navigation in densely built urban environments

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ANNALS OF TELECOMMUNICATIONS 2005年第11-12期60卷 1394-1421页

作者： Royan, J Bouville, C Gioia, P France Telecom R&D F-35510 Cesson Sevigne France

This paper describes a novel progressive and hierarchical representation for densely built urban areas. It aims at navigating through huge urban environments with network-based client-server systems. Thanks to this method, navigation is no longer limited to walkthrough, but allows flying over the city. This can be achieved through a set of dedicated algorithms allowing the decomposition of city into a multi resolution representation. The method efficiently exploits the fact that automated modelling technologies of urban scenes are generally based on the processing of 2D data (video, photographs, cadastral map,...), to model 2D1/2 data (building footprint, height, altitude,...) which turns out to be more compact. From this pre-computed representation of buildings, the server progressively sends the perceptible details to the client for all the regions visible from a given viewpoint.

关键词： three dimensional model three dimensional representation urban area hypermedia navigation interactive mode multiresolution analysis visualization client-server architecture

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Validation of 3D motion tracking of pulmonary lesions using CT fluoroscopy images for robotically assisted lung biopsy

Validation of 3D motion tracking of pulmonary lesions using ...

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Medical Imaging 2005 conference

作者： Xu, S Fichtinger, G Taylor, RH Cleary, K Johns Hopkins Univ Engn Res Ctr Baltimore MD 21218 USA

ISBN: (纸本)0819457183

As recently proposed in our previous work, the two-dimensional CT fluoroscopy image series can be used to track the three-dimensional motion of a pulmonary lesion. The assumption is that the lung tissue is locally rigid, so that the realtime CT fluoroscopy image can be combined with a preoperative CT volume to infer the position of the lesion when the lesion is not in the CT fluoroscopy imaging plane. In this paper, we validate the basic properties of our tracking algorithm using a synthetic four-dimensional lung dataset. The motion tracking result is compared to the ground truth of the four-dimensional dataset. The optimal parameter configurations of the algorithm are discussed. The robustness and accuracy of the tracking algorithm are presented. The error analysis shows that the local rigidity error is the principle component of the tracking error. The error increases as the lesion moves away from the image region being registered. Using the synthetic four-dimensional lung data, the average tracking error over a complete respiratory cycle is 0.8 mm for target lesions inside the lung. As a result, the motion tracking algorithm can potentially alleviate the effect of respiratory motion in CT fluoroscopy-guided lung biopsy.

关键词： motion estimation real-time tracking robust tracking data association textured regions lung biopsy robotics

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Monitoring cache behavior on parallel SMP architectures and related programming tools

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FUTURE GENERATION COMPUTER SYSTEMS-THE INTERNATIONAL JOURNAL OF GRID COMPUTING AND ESCIENCE 2005年第8期21卷 1298-1311页

作者： Brandes, T Schwamborn, H Gerndt, M Jeitner, J Kereku, E Schulz, M Brunst, H Nagel, W Neumann, R Müller-Pfefferkorn, R Trenkler, B Karl, W Tao, J Hoppe, HC Fraunhofer Gesellsch FhG Inst Algorithmen & Wissensch Rechnen SCAI D-53754 At Augustin Germany Tech Univ Munich LRR D-85748 Garching Germany Tech Univ Dresden Zentrum Hochleistungsrechnen ZHR D-01062 Dresden Germany Univ Karlsruhe Inst Rechnerentwurf & Fehlertoleranz D-76128 Karlsruhe Germany Intel GmbH Software & Solut Grp D-50321 Bruhl Germany

This paper describes the ideas and developments of the project EP-CACHE. Within this project new methods and tools are developed to improve the analysis and the optimization of programs for cache architectures, especially for SMP clusters. The tool set comprises the semi-automatic instrumentation of user programs, the monitoring of the cache behavior, the visualization of the measured data, and optimization techniques for improving the user program for better cache usage. As current hardware performance counters do not give sufficient user relevant information, new hardware monitors are designed that provide more detailed information about the cache utilization related to the data structures and code blocks in the user program. The expense of the hardware and software realization will be assessed to minimize the risk of a real implementation of the investigated monitors. The usefulness of the hardware monitors is evaluated by a cache simulator. (c) 2004 Published by Elsevier B.V.

关键词： hardware cache monitoring performance analysis cache optimizations parallel programming tools SMP cluster

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Unsteady nozzle design for pulse detonation engines

Unsteady nozzle design for pulse detonation engines

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41st AIAA/ASME/SAE/ASEE Joint Propulsion conference and Exhibit

作者： Owens, Zachary C. Hanson, Ronald K. Stanford University Stanford CA 94305 United States Aeronautics and Astronautics Building 520 Stanford CA 94305 United States Department of Mechanical Engineering Building 520 Stanford CA 94305 United States

A quasi-one-dimensional, Euler model with detailed finite-rate chemistry is used to conduct a parametric assessment of area ratio effects on the performance of unsteady nozzles in a pulse detonation engine (PDE). Using results from the parametric study, design criteria are suggested for evaluating optimal contraction and expansion nozzle area ratios. In particular, a method using simple isentropic analysis is revealed for identifying optimal expansion area ratio for a given tube configuration. To validate the parametric analysis, three nozzle sections are tested in the Stanford experimental PDE facility. Time resolved thrust and specific impulse (Isp) measurements are made for each nozzle and compared to simulated results. Additionally, Schlieren imaging is used to investigate the blowdown gasdynamics in each of the three nozzles. Comparisons between simulated and measured impulse data are addressed using insights gathered from the flow visualization. Resulting analysis indicates that multi-dimension wave phenomena are important for nozzles with converging sections. Over-prediction of Isp by the model is attributed to an inability to accurately capture the pressure in the plateau region, as well as the inability to accurately model the DDT process. The relative contribution of each of these effects is quantified. Experimental measurements validate trends observed in the parametric study and reveal that an appropriately optimized diverging nozzle produces the largest single-cycle Isp augmentation. The applicability of single-pulse results to realistic multi-cycle engines is discussed, with emphasis on the importance of maintaining high reactant fill pressure between multi-pulse cycles. To this effect, the inclusion of a minimal throat section is addressed as a plausible solution despite its deleterious impact on single-cycle performance.

关键词： data visualization

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Robotics and local fusion

Robotics and local fusion

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conference on Unmanned Ground Vehicle Technology VII

作者： Emmerman, PJ ElanTech Inc. (United States)

ISBN: (纸本)0819457892

Teams of robots or mixed teams of warfighters and robots on reconnaissance and other missions can benefit greatly from a local fusion station. A local fusion station is defined here as a small mobile processor with interfaces to enable the ingestion of multiple heterogeneous sensor data and information streams, including blue force tracking data. These data streams are fused and integrated with contextual information (terrain features, weather, maps, dynamic background features, etc.), and displayed or processed to provide real time situational awareness to the robot controller or to the robots themselves. These blue and red force fusion applications remove redundancies, lessen ambiguities, correlate, aggregate, and integrate sensor information with context such as high resolution terrain. Applications such as safety, team behavior, asset control, training, pattern analysis, etc. can be generated or enhanced by these fusion stations. This local fusion station should also enable the interaction between these local units and a global information world.

关键词： robotics information fusion visualization

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Identification of systematic yield limiters in complex ASICS through volume structural test fail data visualization and analysis

Identification of systematic yield limiters in complex ASICS...

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IEEE International Test conference

作者： C. Schuermyer K. Cota R. Madge B. Benware LSI Logic Corporation Gresham OR USA

Traditional yield analysis has been focused on wafer fabrication and process improvement and is generally limited to wafer level visualization. As products get more complex and design practices have more impact on yield, visualization of yield issues inside the chip becomes increasingly critical. This paper presents novel visualization and analysis of volume structural test fail data to aid in the identification of yield weaknesses through relative analysis of fail signatures. The results show that these methodologies can identify subtle process/design yield limiters which cannot be identified using traditional yield analysis methodologies

关键词： Application specific integrated circuits System testing data visualization data analysis Failure analysis Logic testing Process design Inspection Large scale integration Fabrication

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Evolutionary morphing

Evolutionary morphing

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VIS 05: IEEE visualization 2005, Proceedings

作者： Wiley, David F. Amenta, Nina Alcantara, Dan A. Ghosh, Deboshmita Kil, Yong J. Delson, Eric Harcourt-Smith, Will Rohlf, F. James John, Katherine St. Hamann, Bernd Institute for Data Analysis and Visualization Department of Computer Science University of California Davis American Museum of Natural History Lehman College City University of New York Department of Ecology and Evolution State University of New York Stony Brook

ISBN: (纸本)0780394623

We introduce a technique to visualize the gradual evolutionary change of the shapes of living things as a morph between known three-dimensional shapes. Given geometric computer models of anatomical shapes for some collection of specimens - here the skulls of the some of the extant members of a family of monkeys - an evolutionary tree for the group implies a hypothesis about the way in which the shape changed through time. We use a statistical model which expresses the value of some continuous variable at an internal point in the tree as a weighted average of the values at the leaves. The framework of geometric morphometrics can then be used to define a shape-space, based on the correspondences of landmark points on the surfaces, within which these weighted averages can be realized as actual surfaces. Our software provides tools for performing and visualizing such an analysis in three dimensions. Beginning with laser range scans of crania, we use our landmark editor to interactively place landmark points on the surface. We use these to compute a "tree-morph" that smoothly interpolates the shapes across the tree. Each intermediate shape in the morph is a linear combination of all of the input surfaces. We create a surface model for an intermediate shape by warping all the input meshes towards the correct shape and then blending them together. To do the blending, we compute a weighted average of their associated trivariate distance functions and then extract a surface from the resulting function. We implement this idea using the squared distance function, rather than the usual signed distance function, in a novel way.

关键词： Computer graphics

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Query-driven visualization of large data sets

Query-driven visualization of large data sets

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IEEE conference on visualization

作者： K. Stockinger J. Shalf K. Wu E.W. Bethel Computational Research Division Lawrence Berkeley National Laboratory University of California USA

We present a practical and general-purpose approach to large and complex visual data analysis where visualization processing, rendering and subsequent human interpretation is constrained to the subset of data deemed interesting by the user. In many scientific data analysis applications, "interesting" data can be defined by compound Boolean range queries of the form (temperature>1000) AND (70

关键词： data visualization Indexing data analysis Acceleration Isosurfaces Multidimensional systems Performance analysis Humans Temperature distribution Technology management

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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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Nuclear Science Symposium/Medical Imaging conference

作者： Protas, Hillary D. Thompson, Paul M. Hayashi, Kiralee M. Yu, Chin-Lung Bergsneider, Marvin Huang, Sung-Cheng Univ Calif Los Angeles David Geffen Sch Med Dept Biomath Los Angeles CA USA

ISBN: (纸本)0780392213

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： Imaging systems

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Topology-based macroscopical response and control technology for network security event

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International conference on Computational Intelligence and Security

作者： He, H Hu, MZ Zhang, WZ Zhang, HL Yang, Z Harbin Inst Technol Dept Comp Sci & Technol Harbin 150001 Peoples R China

ISBN: (纸本)3540308199

The large-scale network security events are becoming a major threat to internet. How to quickly detect and effectively control the network security events' spreading has become the research focus among network security experts. By combining active topology measurement with distributed anomaly detection, a large-scale network security events' discovery and cooperative system is proposed, which focuses on macroscopical alert analysis, control point selection, creating control suggestion etc. After the process of visualization, it exhibits preferable application effect. The experimental result proved that it offers administrators the direct decisive advice to prevent network security event from overspreading.

关键词： Security of data

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