This paper presents a parallel implementation of a hierarchical symbolic analysis algorithm (SCAPP) on a 128 node nCUBE hypercube class parallel processor. The basic operation involves exploiting the inherent parallel...
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ISBN:
(纸本)0780312813
This paper presents a parallel implementation of a hierarchical symbolic analysis algorithm (SCAPP) on a 128 node nCUBE hypercube class parallel processor. The basic operation involves exploiting the inherent parallelism in the symbolic analysis algorithm on two levels. The first level is scheduling the partitions of a circuit onto a subset of available processors. The second level is dividing and scheduling, for each partition, the tasks of reducing the sparse symbolic modified nodal analysis matrix using the rest of the available processors. The algorithm does not impose any constraints on number of processors required and uses minimal data movement. This results in low communication overhead between the processors. The algorithm is applicable to any general message passing multiprocessor architecture. A speedup on the order p (number of processors) has been achieved.
A new 3D technique for the human spontaneous intracerebral brain hemorrhage (ICH) region segmentation and quantification is presented in this paper. The ICH primary region segmentation algorithm uses the K-means histo...
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ISBN:
(纸本)0818637528
A new 3D technique for the human spontaneous intracerebral brain hemorrhage (ICH) region segmentation and quantification is presented in this paper. The ICH primary region segmentation algorithm uses the K-means histogram-based clustering algorithm. The ICH edema region segmentation algorithm employs an interactive morphological processing of the ICH brain data. A volume rendering technique is used for the effective 3D visualisation of ICH segmented regions. A computer programme is developed for use in the human spontaneous ICH study involving large number of patients. Some experimental measurements and visualisation results are presented which were computed on real ICH patient brain data.
This paper analyses a mesoscale process of HuangHuai cloud cluster from July 13 to 15, 1989 by using TOVS data of NOAA-11 and adopting the recursive filter analysis system. Some results are obtained: 500 hPa analytica...
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ISBN:
(纸本)0780312406
This paper analyses a mesoscale process of HuangHuai cloud cluster from July 13 to 15, 1989 by using TOVS data of NOAA-11 and adopting the recursive filter analysis system. Some results are obtained: 500 hPa analytical geopotential fields are very similar to the real-time synoptic situations on large-scale weather systems, but there are still some mesoscale systems in addition;There will be cloud cluster developing at the 850 hPa saturated areas or cloud cluster will move to these areas, precipitation occurred at the moist areas but they didn't coincide with the moist center, largescale weather background is necessary to the occurrence of strong rain;mesoscale cloud cluster generated at the warmer side of strong brightness temperature gradient areas of MSU/CH2, but there is not always mesoscale cloud cluster developing at these areas.
Volume rendering has been proposed as a useful tool for extracting information from largedatasets, where non-visual analysis alone may not be feasible. The scale of these applications implies that data managements is...
ISBN:
(纸本)0818639407
Volume rendering has been proposed as a useful tool for extracting information from largedatasets, where non-visual analysis alone may not be feasible. The scale of these applications implies that data managements is an important issue that needs to be addressed. Most volume rendering algorithms, however, process data in raw, uncompressed form. In previous work, we introduced a compressed volume format that may be volume rendered directly with minimal impact on rendering time. In this paper, we extend these ideas to a new volume format that not only reduces storage space and transmission time, but is designed for fast volume rendering as well. The volume dataset is represented as indices into a small codebook of representative blocks. With this data structure, volume shading calculations need only be performed on the codebook and image generation is accelerated by reusing precomputed block projections.
作者：
SUN, DLSMA
SATELLITE METEOROL CTRBEIJING 100081PEOPLES R CHINA
Analyses a mesoscale process of the HuangHuai cloud cluster over China from July 13 to 15, 1989 by using TOVS data of NOAA-11 and adopting the recursive filter analysis system. Some results are obtained as follows: th...
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ISBN:
(纸本)0780312406
Analyses a mesoscale process of the HuangHuai cloud cluster over China from July 13 to 15, 1989 by using TOVS data of NOAA-11 and adopting the recursive filter analysis system. Some results are obtained as follows: the 500 hPa analytical geopotential fields are very similar to the real-time synoptic situations on large-scale weather systems and some mesoscale systems; cloud clusters develop in the 850 hPa saturated areas or move to these areas; precipitation occurred in moist areas but did not coincide with the moist center; a largescale weather background is necessary for the occurrence of strong rain; mesoscale cloud clusters form at the warmer side of strong MSU/CH2 brightness temperature gradient areas, but do not always develop there.
We describe the design principles and functionality of a visual query language called See QL that represents data retrieval and analysis operations as a data-flow graph. A query is viewed as a sequence of relational a...
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Relating to the global climate change prediction, hydrologists are interested in large-scale hydrological processes, particularly in evapotranspiration process as an interaction between land surface and atmosphere. So...
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ISBN:
(纸本)0780312406
Relating to the global climate change prediction, hydrologists are interested in large-scale hydrological processes, particularly in evapotranspiration process as an interaction between land surface and atmosphere. Soil moisture is an important factor controlling the evapotranspiration process. SAR data of E ERS-1 and J ERS-1 are expected to provide large-scale soil moisture information which can be incorporated into a macro-hydrological modelling. However, radar backscatter is sensitive not only to soil moisture but also to surface conditions and soil characteristics. Authors are carrying out ERS-1s' simultaneous verification experiments at five sites with different surface-soil conditions, to establish the relationship between radar backscatter and soil moisture. Experiments include direct sampling of surface soil, measurement of backscatter using C-band scatterometer mounted on an automobile and field dielectric measurements using potable C and L band dielectric probe. Experiments and their analysis are still going on. In this paper, some preliminary result are reported.
Supercomputer simulations now can produce multilevel, multi-scalelargedata sets that require new techniques in scientific visualization and higher levels of hardware performance. The authors explore the use virtual ...
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Supercomputer simulations now can produce multilevel, multi-scalelargedata sets that require new techniques in scientific visualization and higher levels of hardware performance. The authors explore the use virtual reality (VR) technology in this connection. Cosmic Explorer is a VR environment visualizing numerical and observational cosmology data. They have implemented multi-scalevisualization techniques that will work on large, multilevel time-dependent data sets. VR provides natural ways to navigate in an immersive environment, and scientific visualization requires overviewing. The techniques bridge the two in a VR system involving the BOOM and the dataGlove. Combining modern visualization hardware, software, and VR technology, the authors are able to create a system that lets users explore the virtual space created by numerical simulations with ease and naturalness.< >
We describe the design principles and functionality of a visual query language called See QL that represents data retrieval and analysis operations as a data-flow graph. A query is viewed as a sequence of relational a...
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We describe the design principles and functionality of a visual query language called See QL that represents data retrieval and analysis operations as a data-flow graph. A query is viewed as a sequence of relational algebra and other data transformation operations applied to database tables. The language is well-suited for large-scale scientific database applications, where dataanalysis is a major component and the typical queries or data retrieval patterns are unrestricted. The language provides a flexible yet easy-to-use environment for database access and dataanalysis for non-programmer research scientists. We have implemented this language in a system being used in a long-term data-intensive highway pavement research project (MnRoad) conducted by the Minnesota Department of Transportation.< >
Since a power network control system constitutes a large-scale computer network, intricate functions of software such as processing synchronization and data transmission among the constituent computers are required fo...
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Since a power network control system constitutes a large-scale computer network, intricate functions of software such as processing synchronization and data transmission among the constituent computers are required for improvement of system performance and efficiency. Methods for the support of overall large-scale system design are still scarce. Conventional text-oriented tools are insufficient to design, construct, and maintain large and complicated systems. As a means for solving this problem, an analytical method has been designed based on computer graphics visualization of static structural data and execution trace data of a software application's functional units. Prototyping tools for the development of software, enabling the direct manipulation of graphical elements through user-machine interfaces based on virtual reality technology, have been developed.< >
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