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检索条件"机构=Key Lab. of Computer System and Architecture"

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The feature and spatial covariant kernel: Adding implicit spatial constraints to histogram

The feature and spatial covariant kernel: Adding implicit sp...

引用

6th ACM International Conference on Image and Video Retrieval, CIVR 2007

作者： Liu, Xiaobing Wang, Dong Li, Jianmin Zhang, Bo State Key Lab. of Intelligent Technology and System Department of Computer Science and Technology Tsinghua University Beijing 100084 China

ISBN: (纸本)1595937331

In this paper, we are motivated to augment the holistic histogram representation with implicit spatial constrains. To be more concrete, we aim atending a good match function for the problem of object/scene categorization which considers the spatial constraints against heavy clutter and occlusion. Our solution is a partial match kernel under the histogram representation which varies simultaneously at both the feature and spatial resolutions, named as the Feature and Spatial Covariant (FESCO) kernel. Both the FESCO kernel and its late fusion alternative achieve better match accuracy than Spatial Pyramid Match[13] and Pyramid Match[11]. We also apply the keypoint features to video indexing. And on a large scale TRECVID data sets of over 300 hours videos, to our best knowledge, this approach achieves the state-of-the-art result for a single feature. Copyright 2007 ACM.

关键词： Image matching

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A new way to enumerate cycles in graph

A new way to enumerate cycles in graph

引用

Advanced International Conference on Telecommunications andInternational Conference on Internet and Web Applications and Services, AICT/ICIW'06

作者： Liu, Hongbo Wang, Jiaxin State Key Lab. of Intelligent Technology and System Department of Computer Science and Technology Tsinghua University Beijing 100084 China

ISBN: (纸本)0769525229

In many cases, the topology of communcation systems can be abstracted and represented as graph. Graph theories and algorithms are useful in these situations. In this paper, we introduced an algorithm to enumerate all cycles in a graph. It can be applied on digraph or undirected graph. Multigraph can also be used on for this purpose. It can be used to enumerate given length cycles without enumerating all cycles. This algorithm is simple and easy to be implemented. © 2006 IEEE.

关键词： Graph theory

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An OSGi-based heath service platform for elderly people

An OSGi-based heath service platform for elderly people

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2012 IEEE 14th International Conference on e-Health Networking, Applications and Services, Healthcom 2012

作者： Lin, Qiang Ni, Hongbo Zhou, Xingshe Shaanxi Key Lab. of Embedded System Technology School of Computer Science Northwestern Polytechnical University Xi'an 710129 China

ISBN: (纸本)9781457720390

With the rapidly ageing population in most countries, the health and safety issues become the primary concern for elderly people because ageing is often associated with physical and cognitive impairments. In order to provide intelligent assistive health services for elders, in this paper, we propose an integrated OSGi-based service platform that can aggregate a variety of health assistive services, including health status monitoring, automated diagnosis and prognosis, and personalized health instruction by leveraging either stationary biosensors deployed in domestic settings or mobile sensing artifacts carried by elders. The assistive services in this integrated platform are able to help elders sustain and enhance health condition and quality of life with personalized health support. Our proposed platform is highly scalab.e and reusable by exploiting the component-based architecture of OSGI service framework, new services can be easily added into the platform according to individuals' needs and requirements. An implemented prototype system and the relevant performance evaluation are also presented. © 2012 IEEE.

关键词： Health

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Combination of Polarization and OAM Multiplexing by a Single Reflective Metasurface in Terahertz Regime 9

Combination of Polarization and OAM Multiplexing by a Single...

引用

9th IEEE Asia-Pacific Conference on Antennas and Propagation, APCAP 2020

作者： He, Xiaoyuan Deng, Li Beijing University of Posts and Telecommunications Beijing Lab. of Advanced Information Networks Beijing Key Lab. of Network System Architecture and Convergence School of Information and Communication Engineering Beijing100876 China

ISBN: (数字)9781728198057

ISBN: (纸本)9781728198057

For achieving more multiplexing degrees, a method to generate and multiplex dual-polarized electromagnetic waves carrying orbital angular momentum(OAM) by a single reflective metasurface is proposed in this paper. Base on this method, a dual-polarized reflective metasurface that can generate eight OAM beams combined into a coaxial beam in terahertz regime is properly designed and simulated to verify this method. According to the simulation results, the proposed method provides an efficient way for a metasurface to generate and multiplex dual-polarized electromagnetic waves carrying OAM. © 2020 IEEE.

关键词： Electromagnetic wave polarization

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Multiple experts recognition system based on neural network

Multiple experts recognition system based on neural network

引用

13th International Conference on Pattern Recognition, ICPR 1996

作者： Wang, Song Zhu, Xiaoyan Jin, Yijiang Key National Lab. of Artificial Intelligence Technology and System Department of Computer Science and Technology Tsinghua University Beijing 100084 China

ISBN: (纸本)081867282X

For numeral recognition, when a single classifier cannot provide a decision which is 100 percent correct, multiple classifier should be able to achieve higher accuracy. This is because group decisions are generally better than any individual's. In this paper, as evidence, the differences between a ANN classifier and a traditional classifier are discussed. Based on this concept combination methods were developed, which can aggregate the decisions obtained from individual, derive the best final decisions. But different combination methods lead to different performance: accuracy, efficiency and so on. A ANN combining algorithm is developed. The authors analyze it and a voting algorithm within experiments. First experiments on 10000 samples of handwritten numerals have powerfully shown that the results of two different individual classifiers with same features are disparate in performance. Second experiment have discussed two disparate combination methods in contrast. © 1996 IEEE.

关键词： Pattern recognition

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Video diver: Generic video indexing with diverse features

Video diver: Generic video indexing with diverse features

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International Multimedia Conference, MM'07 - 9th ACM SIG Multimedia International Workshop on Multimedia Information Retrieval, MIR'07

作者： Wang, Dong Liu, Xiaobing Luo, Linjie Li, Jianmin Zhang, Bo State Key Lab. of Intelligent Tech. and System Department of Computer Science and Technology Tsinghua University Beijing 100084 China

ISBN: (纸本)9781595937780

Semantic video indexing is critical for practical video retrieval systems and a generic and scalab.e indexing framework is a must for indexing a large semantic lexicon with over 1000 concepts present. This paper fully explores the idea of incorporating many kinds of diverse features into a single framework, combining them altogether to obtain larger degree of invariance which is absent in any of the component features, and thus achieves genericness and scalab.lity. We scale down the formidable computational expense with a clever design of the classification and fusion schemes. To be specific, ~20 kinds of diverse features are extracted to capture limited yet complementary variance in color, texture and edge with spatial constraints implicitly integrated, and over 100 classifiers are built subsequently and fused to produce a generic detector. The extensive experiments on a total of 310 hours of TRECVID news videos show that the proposed framework yields significantly improved performance over that of the best single feature across a variety of concepts. Moreover, a benchmark comparison demonstrates that this approach is state-of-the-art. Meanwhile, the proposed approach generalizes well over previously unseen programs and stations and scales well to a lexicon of over 300 concepts in the LSCOM [18] ontology. Copyright 2007 ACM.

关键词： Indexing (of information)

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Video search in concept subspace: A text-like paradigm 07

Video search in concept subspace: A text-like paradigm

引用

6th ACM International Conference on Image and Video Retrieval, CIVR 2007

作者： Li, Xirong Wang, Dong Li, Jianmin Zhang, Bo State Key Lab. of Intelligent Tech. and System Department of Computer Science and Technology Tsinghua University Beijing 100084 China

ISBN: (纸本)1595937331

Though both quantity and quality of semantic concept detection in video are continuously improving, it still remains unclear how to exploit these detected concepts as semantic indices in video search, given a specific query. In this paper, we tackle this problem and propose a video search framework which operates like searching text documents. Noteworthy for its adoption of the well-founded text search principles, this framework first selects a few related concepts for a given query, by employing a tf-idf like scheme, called c-tf-idf, to measure the informativeness of the concepts to this query. These selected concepts form a concept subspace. Then search can be conducted in this concept subspace, either by a Vector Model or a Language Model. Further, two algorithms, i.e., Linear Summation and Random Walk through Concept-Link, are explored to combine the concept search results and other baseline search results in a reranking scheme. This framework is both effective and efficient. Using a lexicon of 311 concepts from the LSCOM concept ontology, experiments conducted on the TRECVID 2006 search data set show that: when used solely, search within the concept subspace achieves the state-of-the-art concept search result;when used to rerank the baseline results, it can improve over the top 20 automatic search runs in TRECVID 2006 on average by approx. 20%, on the most significant one by approx. 50%, all within 180 milliseconds on a normal PC. Copyright 2007 ACM.

关键词： Semantics

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The importance of query-concept-mapping for automatic video retrieval

The importance of query-concept-mapping for automatic video ...

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15th ACM International Conference on Multimedia, MM'07

作者： Wang, Dong Li, Xirong Li, Jianmin Zhang, Bo State Key Lab. of Intelligent Tech. and System Department of Computer Science and Technology Tsinghua University Beijing 100084 China

ISBN: (纸本)9781595937025

A new video retrieval paradigm of query-by-concept emerges recently. However, it remains unclear how to exploit the detected concepts in retrieval given a multimedia query. In this paper, we point out that it is important to map the query to a few relevant concepts instead of search with all concepts. In addition, we show that solving this problem through both text and image inputs are effective for search, and it is possible to determine the number of related concepts by a language modeling approach. Experimental evidence is obtained on the automatic search task of TRECVID 2006 using a large lexicon of 311 learned semantic concept detectors. Copyright 2007 ACM.

关键词： Image retrieval

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Clustering algorithm based on Delaunay triangulation density metric

Clustering algorithm based on Delaunay triangulation density...

引用

International Conference on Fuzzy systems and Knowledge Discovery (FSKD)

作者： Jia, L.V. Chongqing Key Lab. of Operations Research and System Engineering College of Computer and Information Science Chongqing Normal University Chongqing 400047 China

ISBN: (纸本)9781424459346

According to the problem that K-Means clustering algorithm fails to correctly distinguish non-convex shape clusters, computation mode of distance in the algorithm is changed and density metric mode which can reflect the characteristics of data themselves is adopted instead. In the mode, Delaunay triangulation graph which has the advantages of nearest neighbour and adjacency is introduced to compute density. Simultaneously, because K-Means clustering algorithm itself belongs to a global optimization problem, chaos optimization dedicated to global optimization is applied to optimize objective function for the sake of obtaining global minimum solution. Experiments results indicate that clustering algorithm based on Delaunay triangulation density metric can find arbitrary non-convex shape clusters. ©2010 IEEE.

关键词： Clustering algorithms

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A clustering algorithm use SOM and K-Means in Intrusion Detection

A clustering algorithm use SOM and K-Means in Intrusion Dete...

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International Conference on E-Business and E-Government (ICEE)

作者： Wang, Huai-Bin Yang, Hong-Liang Xu, Zhi-Jian Yuan, Zheng Tianjin Key Lab. of Intelligent Computing and Novel Software Technology Tianjin University of Technology 300191 Tianjin China Key Laboratory of Computer Vision and System Ministry of Education 300191 Tianjin China Key Laboratory of Computer Vision and System Ministry of Education China

ISBN: (纸本)9780769539973

Improving detection definition is a pivotal problem for intrusion detection. Many intelligent algorithms were used to improve the detection rate and reduce the false rate. Traditional SOM cannot provide the precise clustering results to us, while traditional K-Means depends on the initial value serious and it is difficult to find the center of cluster easily. Therefore, in this paper we introduce a new algorithm, first, we use SOM gained roughly clusters and center of clusters, then, using K-Means refine the clustering in the SOM stage. At last of this paper we take KDD CUP-99 dataset to test the performance of the new algorithm. The new algorithm overcomes the defects of traditional algorithms effectively. Experimental results show that the new algorithm has a good stability of efficiency and clustering accuracy. © 2010 IEEE.

关键词： Self organizing maps

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