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This paper develops a new trivariate hierarchical spline scheme for volumetric data representation. Unlike conventional spline formulations and techniques, our new framework is built upon a novel parametric domain called Generalized PolyCube (GPC), comprising a set of regular cubes being glued together. Compared with the conventional PolyCube (PC) that could serve as a "one-piece'' 3-manifold...
There are leaks in the permission distribution and delegation for the traditional access control based on roles. By introducing the concept of risk, this study establishes an integrated theoretic framework. This paper represents access control policy and the ordering relation among roles based on risk. The concept of risk distance is proposed, which made the security of access control polices can...
Data-intensive applications are becoming increasingly common in Grid environments. These applications require enormous volume of data for the computation. Most conventional meta-scheduling approaches are aimed at computation intensive application and they do not take data requirement of the applications into account, thus leading to poor performance. Efficient scheduling of data-intensive applications...
This article uses the graphics designer and the code editor of GL Studio combined with VC++6.0 to simulate the instruments which is based on a certain type aeroboat. This paper introduces the GL Studio software, its main function and its application in aeroboat simulation. This simulation result can real-timely shows the parameters (speed, altimeter and electrical quantity) of the aeroboat, and it...
Resource co-allocation is one of the crucial technologies affecting the utility and quality of services of large-scale distributed environments by simultaneously allocating multiple resources to one application. This paper concentrated on the problem to guarantee the QoS of co-allocation jobs via advance reservation and investigated the performances of two typical scheduling algorithms with and without...
In recent years, with the development of GPU, based on the general purpose computation on graphics processors has became a new field. Aiming at the processing of GPU, this paper provides the formal description for data parallel mode, a detailed description of the CUDA programming mode land the principle of optimization. It shows by the comparative experiment that CUDA owns strongly of the ability...
This text analyzed the reason of generating error of GM (1, 1), from the integral calculus angle discrete GM (1, 1). A kind of method putting forward making use of Romberg integral calculus formula and quadratic interpolation method to construct the background value of the model, raised simulation and prediction precision of GM(1,1), and the actual example verify the feasibility and effectiveness...
The display of realistic ocean environment is one of the most important research fields in computer graphics. In this work we present a practical algorithm for real-time rendering of realistic and unbounded ocean. Relying on the newest features of graphics programmable units (GPU), our method adopts parallel computing technique for generating ocean surface in GPU and uses efficient shading trips for...
The peer-to-peer (P2P) live video streaming system has been demonstrated to have great potential in the public Internet; the large-scale deployment of such systems, however, critically relies on how effective they can deal with the high dynamics encountered, in particular during flash crowd. The rationale behind is that the scaling in P2P live video streaming systems is heavily determined by the timing...
In standard backfill algorithms, a job will be terminated immediately it has been processed for its estimated runtime. This drives users not to provide tight estimates to make their jobs to be scheduled earlier but at the risk of being killed. This paper presents an enhanced mechanism to tolerate underestimated jobs by continuing processing them on condition that they will not delay any other running...
Visibility culling is a fundamental problem in computer graphics. By combining object-space coherence with image-space coherence, this paper presents a novel algorithm for speeding up complex models rendering. The algorithm is based on the new concept of occupancy proportion (OP), which offers a simple, fast and efficient approach to visibility culling. We exploit the hardware accelerator character,...
This paper presents a new system for computer-aided orthognathic surgery which aims at correcting dento-facial defects and keeping patient away from much radiation and high cost of CT or MRI imaging. The system allows simulating the surgical correction on virtual 3-D model of the skull reconstructed with the acquisition of radiographs of three orthogonal views and facial mesh data generated by 3-D...
Cell broadband engine (Cell BE) is a state-of-the-art heterogeneous multi-core processor. It is an accelerator-based multi-core architecture, which contains a powerful 64-bit dual-threaded PowerPC core and eight high efficient single-instruction-multiple-data (SIMD) cores. Apart from traditional parallel systems, the users must explicitly manage the communication, scheduling and load-balancing to...
Robust detection of moving objects in complex and dynamic scenes is one of the most challenging issues in computer vision. In this paper, we present an approach to segmenting moving objects with nonparametric estimated local kernel histogram (ELKH) in dynamic scenes. By using the correlation and texture of spatially proximal pixels, local kernel histogram background model is constructed. Then probability...
Robust detection of moving objects in complex scenes is one of the most challenging issues in computer vision. In this paper, we present a novel texture-wise approach to segment moving objects with codebook and local binary patterns (LBP). In many moving segmentation algorithms, the information from limited frames before current image is used. Our approach models background over long time with small...
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