This paper introduces a network architecture called Vehicular Wireless Burst Switching (VWBS). The main objective of this architecture is to provide low-cost connectivity solution for isolated and dispersed regions wi...
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This paper introduces a network architecture called Vehicular Wireless Burst Switching (VWBS). The main objective of this architecture is to provide low-cost connectivity solution for isolated and dispersed regions with no networks infrastructure. The proposed architecture is based on the concept of Delay Tolerant Networks (DTN) and can be applied to various scenarios, including rapid deployment of emergency communication systems when all communication links have failed. In this paper, we present an overview of VWBS networks and show how their performance, in terms of average packet delays, can be improved using store-and-forward devices called relay nodes. Furthermore, we introduce several heuristic algorithms, which can be used to place minimum number of relay nodes. Through computer simulations, we compare the performance of the algorithms and their tradeoffs. We conclude our work by examining possible open research issues in VWBS.
The image segmentation plays an important role in medical image processing. Many segmentation algorithms exist. Most of them produce raster data which is not suitable for 3D geometrical modeling of human tissues. In t...
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This paper describes the video summarization system built for the TRECVID 2007 evaluation by the Brno team. Motivations for the system design and its overall structure are described followed by more detailed descripti...
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ISBN:
(纸本)9781595937803
This paper describes the video summarization system built for the TRECVID 2007 evaluation by the Brno team. Motivations for the system design and its overall structure are described followed by more detailed description of the critical parts of the system, which are feature extraction and clustering of frames (shots, sub-shots) in time domain. Many ideas were not included in the system because of the time constraints. Those considered promising are stated and are briefly described as possible future work. The result of video summarization presented in this paper is promising and will benefit further investigation. This is specifically true as not all the features that can be considered and processing methods were implemented in the evaluated system. Copyright 2007 ACM.
As companies continue to embrace PLM practices to improve business operations, the ability to create and communicate 3D part and assembly representations throughout the enterprise is becoming increasingly important. C...
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As companies continue to embrace PLM practices to improve business operations, the ability to create and communicate 3D part and assembly representations throughout the enterprise is becoming increasingly important. Companies that design and produce particularly large artifacts, whether in terms of geometry scale or in terms of object complexity, experience problems of portability and scalability when using vendor-supported "standard" file formats. This presentation outlines a project, conducted in conjunction with a large aerospace firm, which examined the conversion, loading, and transportation of such files across a network. The project also examined user interaction with 3DXML files as compared to CGR files, within CATIA. A discussion of project activities, issues encountered, and resulting recommendations is included.
Incremental subspace methods have proven to enable efficient training if large amounts of training data have to be processed or if not all data is available in advance. In this paper we focus on incremental LDA learni...
ISBN:
(纸本)1901725340
Incremental subspace methods have proven to enable efficient training if large amounts of training data have to be processed or if not all data is available in advance. In this paper we focus on incremental LDA learning which provides good classification results while it assures a compact data representation. In contrast to existing incremental LDA methods we additionally consider reconstructive information when incrementally building the LDA subspace. Hence, we get a more flexible representation that is capable to adapt to new data. Moreover, this allows to add new instances to existing classes as well as to add new classes. The experimental results show that the proposed approach outperforms other incremental LDA methods even approaching classification results obtained by batch learning.
We present a new real-time hydraulic erosion simulation for computergraphics. In our system water runs over the surface and disintegrates the underlying layer of soil. The grit is simulated as a fluid with higher vis...
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We present a fast technique for the simulation of accumulated snow. Our technique is based on two phenomena;local occlusion of small holes and ditches, and the global influence of a skylight. We use ambient occlusion ...
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In this article we present interactive Focus and Context (F+C) visualizations for Augmented Reality (AR) applications. We demonstrate how F+C visualizations are used to affect the user's perception of hidden objec...
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Augmented Reality (AR) enables users to visualize synthetic information overlaid on top of real imagery. Such visualization may be achieved by tools that distort, filter or enhance the explored information. However, l...
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Microfacet models have proven very successful for modeling light reflection from rough surfaces. In this paper we review microfacet theory and demonstrate how it can be extended to simulate transmission through rough ...
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