检索结果-内蒙古大学图书馆

IEEE International Conference on Communications

作者： Yue Lu Wei Wang Lin Chen Zhaoyang Zhang Aiping Huang Department of Information Science and Electronic Engineering Zhejiang Key Lab. of Information Network Technology Zhejiang University Hangzhou P.R. China Lab. de Recherche en Informatique (LRI) University of Paris-Sud 11 Orsay Cedex France

Mobile relay-assisted forwarding can improve the network capacity, but meanwhile increase the energy consumption. In this paper, we propose two distance-based energy-efficient opportunistic forwarding (DEEOF) schemes in mobile delay tolerant networks (DTNs). The proposed schemes strike a balance between energy consumption and network performance by maximizing the energy efficiency while maintaining a high packet delivery ratio from two different angles. Specifically, in the developed algorithms, we introduce the forwarding equivalent energy-efficiency distance (FEED) to quantify the transmission distances achieving the same energy efficiency at different time instances. The expected energy efficiency can thus be estimated based on the FEED. Furthermore, the distribution of the greatest forwarding energy efficiency in the predicted period is investigated to provide more accurate prediction for the energy efficiency. The forwarding decision in the algorithms is made by comparing the current energy efficiency and the estimated future expectation. The performance improvement of the proposed algorithms is also demonstrated by simulation, especially for systems where the source has very limited battery reserves.

关键词： Relays Prediction algorithms Heuristic algorithms Feeds Algorithm design and analysis Delays Energy consumption

来源：评论

学校读者我要写书评

暂无评论

Detect the Rail Track Flaw by Estimating the Camera Shaking

Detect the Rail Track Flaw by Estimating the Camera Shaking

引用

17th International IEEE Conference on Intelligent Transportation Systems & The Asia-Pacific Council on Systems Engineering Conference 2014

作者： Liang Wang Xiaoyue Luo Berthold K.P.Horn Shengchun Wang Siwei Luo Beijing Key Lab of Traffic Data Analysis and Mining Beijing Jiaotong University Department of Mathematics Linfield CollegeOR 97128USA CSAIL Department of Electrical Engineering and Computer ScienceMassachusetts Institute of TechnologyBostonMA02139 USA

In this paper,we present a method of detecting the rail track bends and *** from the traditional machine-vision based methods which analyze the images of the rail surface,we estimate the shake of the camera — which is caused by the flaw or bend of the rail track — from the video used for railway environment *** provide both theoretical analysis — based on the theory of optical flow and passive navigation — and the corresponding fast algorithms,*** brightness-pattern-matching code(BPMC) and shaking-type code(STC).Our method uses the surveillance video of the railway environment directly,thus,we do not need extra expensive instruments.

关键词： image Detect the Rail Track Flaw by Estimating the Camera Shaking Track

来源：评论

学校读者我要写书评

暂无评论

A query-aware location privacy protection approach in LBS for road networks

A query-aware location privacy protection approach in LBS fo...

引用

2013 IEEE International Conference on Green Computing and Communications and IEEE Internet of Things and IEEE Cyber, Physical and Social Computing, GreenCom-iThings-CPSCom 2013

作者： Li, Wei Jiang, Jiangtao Li, Yunchun Li, GuoJun School of Computer Science and Technology Key Lab. of Beijing Network Technology Beihang University Beijing China

ISBN: (纸本)9780769550466

Mobile users often request services from Location Based Service (LBS) provider when traveling along roads. In order to acquire better service, they have to provide their exact location information, which may result in leaking their location privacy. Current location privacy preservation methods for road networks usually based on star expansion model, which may make anonymity segment set overlapped each other. To address this issue, a query-aware location anonymity approach is proposed, and highlighted itself in three aspects: (1) the model meets the location K-anonymity and road segment l-anonymity, and the reciprocal anonymity segment set is shared among all mobile users located in the segment set. (2) The anonymity segment set is compacted which can improve the query efficiency in LBS. (3) Different optimization levels can be provided considering the tradeoff between privacy preservation and query processing performance. At last, the experiment results verify the effectiveness and security of the anonymity segment sets. © 2013 IEEE.

关键词： Location based services

来源：评论

学校读者我要写书评

暂无评论

Human symptoms-disease network

Human symptoms-disease network

引用

”数字化中医信息系统“临床术语本体研究专家研讨会

作者： XueZhong Zhou J(o)rg Menche Albert-László Barabási Amitabh Sharma School of Computer and Information Technology and Beijing Key Lab of Traffic Data Analysis and Minin Center for Complex Network Research Northeastern University Physics Department111 DA/Physics Dept.1 Center for Complex Network Research Northeastern University Physics Department111 DA/Physics Dept.1 Center for Complex Network Research Northeastern University Physics Department111 DA/Physics Dept.1

In the post-genomic era, the elucidation of the relationship between the molecular origins of diseases and their resulting phenotypes is a crucial task for medical research Here, we use a large-scale biomedical literature database to construct a symptom-based human disease network and investigate the connection between clinical manifestations of diseases and their underlying molecular *** find that the symptom-based similarity of two diseases correlates strongly with the number of shared genetic associations and the extent to which their associated proteins ***, the diversity of the clinical manifestations of a disease can be related to the connectivity patterns of the underlying protein interaction *** comprehensive, high-quality map of disease-symptom relations can further be used as a resource helping to address important questions in the field of systems medicine,for example, the identification of unexpected associations between diseases, disease etiology research or drug design.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Quantitative Measurement of Coronary Artery Stenosis in CCTA Images Using a 2D Parametric Intensity Model

Quantitative Measurement of Coronary Artery Stenosis in CCTA...

引用

Annual International Conference of the IEEE Engineering in Medicine and Biology Society

作者： Guanyu YANG Xinglou ZHAO Lijun TANG Huzhong SHU Christine TOUMOULIN Lab of Image Science and Technology Key Laboratory of Computer Network and Information Integration (Southeast University) Dept. of Radiology the First Affiliated Hospital of Nanjing Medical University INSERM-U1099 LTSI Universite de Rennes 1

ISBN: (纸本)9781424479276

In this paper, we propose an approach based on 2D vessel model to segment the vessel lumen in three-dimensional coronary computed tomographic angiography (CCTA) images. The 2D parametric intensity model is introduced first to simulate the intensity distribution of vessel lumen with different size in the longitudinal images. Then the Levenberg-Marquardt method is applied to fit the model within a series of region-of interests defined in the longitudinal image. The estimated parameters of the model are employed to define the boundary points of vessel lumen. The detected boundary points of vessel lumen in six longitudinal images are transformed to the cross-sectional planes in order to calculate the degree of stenosis according to the luminal areas. Our proposed method was evaluated in ten CCTA images with ten reported non-calcified stenosis. The degree of each stenosis was computed according to the luminal area and compared with the standard reference given by radiologists. Experimental results show that our method can estimate the degree of stenosis with a high accuracy.

关键词： Image segmentation Arteries Fitting Solid modeling Three-dimensional displays Computational modeling Accuracy

来源：评论

学校读者我要写书评

暂无评论

Domo: Passive Per-Packet Delay Tomography in Wireless Ad-hoc networks

Domo: Passive Per-Packet Delay Tomography in Wireless Ad-hoc...

引用

International Conference on Distributed Computing Systems

作者： Yi Gao Wei Dong Chun Chen Jiajun Bu Tianyu Chen Mingyuan Xia Xue Liu Xianghua Xu Zhejiang University Hangzhou Zhejiang CN Zhejiang Provincial Key Laboratory of Service Robot Zhejiang University China Hangzhou Dianzi University Hangzhou Zhejiang CN School of Computer Science McGill University Canada Zhejiang Provincial Key Lab of Data Storage and Transmission Technology Hangrhou Dianzi University China

In multi-hop wireless ad-hoc networks, packet delivery delay is one of the most important performance metrics. While a lot of research efforts have been spent on measuring and optimizing the end-to-end delay performance, there usually lack accurate and lightweight methods for decomposing the end-to-end delay into the per-hop delay for each packet. Knowledge on the per-hop per-packet delay can greatly improve the network visibility and facilitate network measurement and management. In this paper, we propose Domo, a passive, lightweight and accurate delay tomography approach to decomposing the packet end-to-end delay into each hop. The basic idea is to formulate the problem into a set of optimization problems by carefully considering the constraints among various timing quantities. At the network side, Domo attaches a small overhead to each packet for constructing constraints of the optimization problems. At the PC side, Domo employs semi-definite relaxation and several other methods to efficiently solve the optimization problems. We implement Domo and evaluate its performance extensively using large-scale simulations. Results show that Domo significantly outperforms two existing methods, nearly tripling the accuracy of the state-of-the-art.

关键词： Delays Ad hoc networks Wireless communication Optimization Accuracy Tomography Educational institutions

来源：评论

学校读者我要写书评

暂无评论

Construction of time-stamped mobility map for path tracking via smith-waterman measurement matching

引用

Mathematical Problems in Engineering 2014年第1期2014卷

作者： Zhou, Mu Tian, Zengshan Xu, Kunjie Wu, Haibo Pu, Qiaolin Yu, Xiang Chongqing Key Lab of Mobile Communications Technology Chongqing University of Posts and Telecommunications Chongqing 400065 China Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Hong Kong Hong Kong Graduate Telecommunications and Networking Program University of Pittsburgh Pittsburgh PA 15260 United States China Internet Research Lab Computer Network Information Center Chinese Academy of Sciences Beijing 100190 China

Path tracking in wireless and mobile environments is a fundamental technology for ubiquitous location-based services (LBSs). In particular, it is very challenging to develop highly accurate and cost-efficient tracking systems applied to the anonymous areas where the floor plans are not available for security and privacy reasons. This paper proposes a novel path tracking approach for large Wi-Fi areas based on the time-stamped unlabeled mobility map which is constructed from Smith-Waterman received signal strength (RSS) measurement matching. Instead of conventional location fingerprinting, we construct mobility map with the technique of dimension reduction from the raw measurement space into a low-dimensional embedded manifold. The feasibility of our proposed approach is verified by the real-world experiments in the HKUST campus Wi-Fi networks, sMobileNet. The experimental results prove that our approach is adaptive and capable of achieving an adequate precision level in path tracking. © 2014 Mu Zhou et al.

关键词： Wi-Fi

来源：评论

学校读者我要写书评

暂无评论

Adaptive control of unmanned surface vessels matching an optimized reference model

Adaptive control of unmanned surface vessels matching an opt...

引用

IEEE International Conference on Robotics and Biomimetics

作者： Chenguang Yang Rongxin Cui Zhijun Li Sanjay Sharma Xingang Zhao Center for Robotics and Neural Systems Plymouth University Ply-mouth UK The MOE Key Lab of Autonomous System and Network Control South China University of Technology Guangzhou China School of Marine Science and Technology Northwestern Polytechnical University Xi'an China School of Marine Science and Engineering University of Plymouth Plymouth UK Shenyang Institute of Automation Chinese Academy of Sciences Shenyang China

ISBN: (纸本)9781479973989

In this paper, adaptive control of unmanned marine surface vessel has been investigated in the presence of uncertain dynamics as well as external disturbance. Variable structure technique has been utilized in the control design to make the dynamic response and desired motion tracking as quickly as possible. In practice, usually the desired trajectories are given as step points, such that direct immediate tracking would cause large acceleration and huge control effort, while the latter may be out of the actuators' limitation. Therefore, a reference model approach is employed, such that instead of direct tracking of the desired set point, the control objective becomes to shape the closed-loop dynamics to match a reference model. The reference model is built using optimization technique which tries to minimizes both tracking error and motion acceleration, and subsequently control effort. The smooth tracking is thus guaranteed in an optimal manner.

关键词： Tracking Acceleration Trajectory Adaptation models Performance analysis Mathematical model Dynamics

来源：评论

学校读者我要写书评

暂无评论

A Provably secure Certificate based ring signature without pairing

引用

International Journal of network Security 2014年第4期16卷 278-285页

作者： Qin, Zhiguang Xiong, Hu Li, Fagen School of Computer Science and Engineering University of Electronic Science and Technology of China No. 4 North Jianshe Road Chenghua District chengdu Sichuan 610054 China Key Lab of Network Security and Cryptology Fujian Normal University No. 8 Shangsan Road Cangshan District Fuzhou Fujian 350007 China State Key Laboratory of Information Security Institute of Software Chinese Academy of Sciences No. 19 Yuquan Road Shijingshan District Beijing 100190 China

In Eurocrypt 2003, Gentry introduced the notion of certificate-based encryption. The merit of certificate-based encryption lies in implicit certificate and no private key escrow. This feature is desirable especially for the efficiency and the real spontaneity of ring signature, which involve a large number of public keys in each execution. In this paper, we propose an efficient certificate-based ring signature scheme which does not require any pairing computation. Furthermore, this scheme is proven secure under the Discrete Logarithm assumption in the random oracle model. To the best of authors' knowledge, this is the first construction of certificate-based ring signature scheme in the literature that has such kind of feature.

关键词： Authentication

来源：评论

学校读者我要写书评

暂无评论

Fusing visual tracking and navigation for autonomous control of an intelligent wheelchair

Fusing visual tracking and navigation for autonomous control...

引用

3rd IFAC Conference on Intelligent Control and Automation science, ICONS 2013

作者： Lei, Shuangshuang Li, Zhijun Key Lab of Autonomous System and Network Control College of Automation Science and Engineering South China University of Technology Guangzhou China

ISBN: (纸本)9783902823458

This paper presents a hybrid navigation and control method for intelligent wheelchair. A robust and semi-supervised vision tracking method using Microsoft Kinect and obstacle avoidance navigation approach are integrated into a two-level control system. Then, position tracking control considering nonholonomic constraints are adopted for the motion control of wheelchairs. An indoor environment is set up for evaluating the application of the proposed approaches. The experimenta l results show that the proposed method is effective and can be used as a hands-free controller for the intelligent wheelchair. Copyright © 2013 IFAC.

关键词： Wheelchairs

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：