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A unique multi-functional landmark for autonomous navigation

A unique multi-functional landmark for autonomous navigation

引用

5th International Conference on Natural Computation, ICNC 2009

作者： Wang, Dan Jia, Yunwei Cao, Zuoliang Tianjin Key Lab. of Intelligent Computing and Novel Software Technology Tianjin University of Technology Ministry of Education China School of Mechanical Engineering Tianjin University of Technology China

ISBN: (纸本)9780769537368

To save time, improve flexibility and guarantee accuracy of the navigation system of the mobile robots, a multifunction landmark and a new navigation algorithm are proposed in this paper. With the new algorithm and landmark the mobile robots can be located by only a single landmark, and can be navigated in a large area by serial landmarks. The simple configuration and the convenient material of the landmark increased the system 's flexibility and decreased the complexity of the algorithm. From the experimental results it can be concluded that the navigation system has fast navigation speed and high navigation accuracy. © 2009 IEEE.

关键词： Navigation systems

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Interdependency analysis of infrastructures

引用

6th International Symposium on Neural Networks, ISNN 2009

作者： Mao, Zijun Hong, Liu Fei, Qi Ouyang, Ming Institute of System Engineering Huazhong University of Science and Technology Wuhan 430074 China Key Lab. for Image Processing and Intelligent Control Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)3642015123

Electric power, potable water, telecommunications, natural gas, and transportation are examples of critical infrastructures, the intrinsic feature of which are suitable for network analysis. This paper proposes a method framework based on the complex network to explore the interdependency of these infrastructures. We describe the topological characterization of two interdependent small-sized real networks, based on which the interdependent model is devised. We define the interdependent factor to characterize the direct interdependency of two infrastructures, and also its fluctuation in the situations of random removal and targeted removal on the electric and water infrastructures is studied. Furthermore we propose a matrix M to reflect all direct and indirect interactions among infrastructures, which also makes contributions to the understanding of infrastructures catastrophes. © 2009 Springer Berlin Heidelberg.

关键词： Complex networks

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Epidemic spreading with variant infection rates on scale-free network

引用

6th International Symposium on Neural Networks, ISNN 2009

作者： Hong, Liu Ouyang, Min Mao, Zijun Chen, Xueguang Institute of System Engineering Huazhong University of Science and Technology Wuhan 430074 China Key Lab. for Image Processing and Intelligent Control Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)3642015123

In this paper, we proposed a susceptible-infected model with variant infection rates because different individuals have different resistance to diseases in different periods of real epidemic events. We consider two cases: Case 1, we know every individual's infection rate to a kind of epidemic, satisfy a type of distribution. Case 2, assume all individuals have same initial infection rates, a susceptible individual's infection rate will be less than the initial rate if he is not infected after limited number of contacts with infected ones. For both two cases, at the time tD, preventive and control measures bring into effects, every individual's infection rate would decrease. We implemented this models on scale-free networks, and found that the epidemic process before the time tD in Case 1 is almost the same as that in Standard SI model if the infection rate in Standard SI model equals the mean infection rate in Case 1. Furthermore, using numerical simulation, we analysis the effects of the parameter tD, and find the bimodal distribution of final infection rates. Finally, we conclude what we get in this paper and give our future direction. © 2009 Springer Berlin Heidelberg.

关键词： Complex networks

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Combinational method for focal brain activation detection using MEG signal

Combinational method for focal brain activation detection us...

引用

Medical Imaging 2009: Biomedical Applications in Molecular, Structural, and Functional Imaging

作者： Rajabioun, Mehdi Babajani-Feremi, Abbas Soltanian-Zadeh, Hamid Control and Intelligent Processing Center of Excellence Electrical and Computer Engineering Department University of Tehran Tehran 14395-515 Iran Image Analysis Lab. Radiology Department Henry Ford Hospital Detroit MI 48202 United States

ISBN: (纸本)9780819475138

Magnetoencephalography (MEG) is a neuroimaging technique for brain activation detection. This technique does not provide a unique solution due to ill-posedness of its inverse solution. Several methods are proposed to improve the MEG inverse solution. Minimum Norm (MN) is a simple method whose solution is distributed and biased toward the superficial sources. In addition, its solution is sensitive to the noise. Several methods are proposed to improve performance of the MN method. In this paper, we propose a method whose solution is less sensitive to the noise and spatially unbiased toward the superficial sources. control of focal solution properties is achieved by specifying a parameter in the proposed method. Performance of the proposed method is compared to others using simulation studies consisting of single and multiple dipole sources as well as an extended source model. Proposed method has superior performance compared to non-iterative methods. Its performance is similar to the iterative methods but its computational load is lower. © 2009 SPIE.

关键词： Inverse problems

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Compiler/hardware assisted application code and data security in embedded systems

Compiler/hardware assisted application code and data securit...

引用

28th Digital Avionics Systems Conference: Modernization of Avionics and ATM-Perspectives from the Air and Ground, DASC 2009

作者： Bu, Chunguang Wang, Xiang Zhang, Chi Liu, Jizhong Wang, Xiaodong Qi, Chuntang Gao, Xiaoying Li, Baosen School of Electronic and Information Engineering Beihang University Beijing 100191 China National Key Lab. of Sci. and Tech. on Aerospace Intelligent Control Beijing 100854 China Luoyang Optoelectro Technology Development Center Luoyang 471009 China

ISBN: (纸本)9781424440788

Embedded systems have stepped deeper into Integrated Avionics systems, and security is becoming an important concern. Most embedded systems present a number of software vulnerabilities, such as buffer overflows. Furthermore, the rapid growth and pervasive use of embedded systems makes it easier for a sophisticated attacker to gain physical access to launch physical attacks on insecure off-chip main memory. This paper presents a novel compiler/ hardware assisted application code and data protection architecture (CHCDP) to monitor the execution of application. The compiler extracts the control flow and static data integrity validation information using hashing and cyclical redundancy check (CRC) integrity algorithms at compile time. The dynamic data integrity validation is generated in the process of application execution. Likewise, the function return address and frame point are also protected at runtime. The designed hardware observes its dynamic execution trace and checks whether the trace conforms to the permissible behavior. And it will trigger appropriate response mechanisms if finding a mismatch. An OR1200 processor is assigned to build a System on a Programmable Chip (SOPC) that implements the architectural design. The experimental analysis shows that the proposed techniques can eliminate a wide range of common software and physical attacks with low performance penalties and minimal overheads. ©2009 IEEE.

关键词： Embedded systems

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OWA fuzzy linking histogram approach for image retrieval

OWA fuzzy linking histogram approach for image retrieval

引用

IEEE 7th International Conference on Computational Cybernetics, ICCC 2009

作者： Mahmoudi, Maryam Tayefeh Beheshti, Maedeh Lucas, Caro Taghiyareh, Fattaneh School of Electrical and Computer Eng. University of Tehran Tehran Iran Knowledge Engineering and Intelligent Systems Group Iran Telecom Research Center Tehran Iran School of Computer Engineering Iran University of Science and Technology Tehran Iran Control and Intelligent Processing Lab. University of Tehran Tehran Iran School of Electrical and Computer Eng. College of Engineering University of Tehran Tehran Iran

ISBN: (纸本)9781424453115

Color image histograms are very useful tools for content based image retrieval (CBIR) that can be applied on features such as colour, texture and shape. As these kinds of histograms results with large variations between neighbouring bins, they seem so sensitive to any kind of changes such as noise, illumination. To overcome this problem, in this paper, fuzzy linking histogram approach based on OWA aggregation operator is proposed , which is capable of projecting 3-dimensional (L*a*b*) colour histograms into single-dimension. The proposed method have been evaluated and compared with five other related methods in retrieving similar images from the common dataset which is availab.e on http://***/∼konkonst. The experimental results on 100 images within two categories of Cat and Sky reveals better performance of the proposed method in comparison with the other mentioned methods. ©2009IEEE.

关键词： Color

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Exposure-path prevention in directional sensor networks using sector model based percolation

Exposure-path prevention in directional sensor networks usin...

引用

2009 IEEE International Conference on Communications, ICC 2009

作者： Liang, Liu Xi, Zhang Huadong, Ma Networking and Information Systems Laboratory Department of Electrical and Computer Engineering Texas A and M University College Station TX 77843 United States Beijing Key Lab. of Intelligent Telecomm. Software and Multimedia Beijing University of Posts and Telecomm. Beijing 100876 China

ISBN: (纸本)9781424434350

In wireless sensor networks, most existing works on region coverage mainly concentrate on the omnidirectional sensor based full coverage, which ensures that all points in the sensor-deployed region are covered. In contrast, this paper studies the problem of exposure-path prevention for the region coverage in directional sensor networks. Because the exposure paths are prevented as long as no moving objects or phenomena can go through a sensor-deployed region without being detected, exposure-path prevention does not require full coverage, and instead it only needs the partial coverage. Towards this end, we apply the percolation theory to solve the exposure path problem for directional sensor networks. In particular, we map the exposure path problem into a sector based percolation model, and then derive the bounds of critical density where directional sensors are deployed according to a 2-dimensional Poisson process. Also conducted is a set of extensive simulations to validate and evaluate our developed models and schemes. ©2009 IEEE.

关键词： Wireless sensor networks

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Minimal exposure path algorithms for directional sensor networks

Minimal exposure path algorithms for directional sensor netw...

引用

2009 IEEE Global Telecommunications Conference, GLOBECOM 2009

作者： Liu, Liang Zhang, Xi Ma, Huadong Networking and Information Systems Laboratory Department of Electrical and Computer Engineering Texas A and M University College Station TX 77843 United States Beijing Key Lab. of Intelligent Telecomm. Software and Multimedia Beijing University of Posts and Telecomm. Beijing 100876 China

ISBN: (纸本)9781424441488

As a fundamental problem of wireless sensor networks, the minimal exposure path problem corresponding to the sensor network's worst-case coverage plays an important role in the applications for detecting intrusions. However, most existing works about minimal exposure path are based on omnidirectional sensors. In contrast, this paper studies the minimal exposure path problem for directional sensor networks. We first develop a directional sensing model: directional sensitivity model. Then, we formulate the minimal exposure path problem by using two sensing intensity functions: all-sensor intensity function and maximum-sensor intensity function, and generate two weighted grids to convert the minimal exposure path problem into two discrete geometric problems. Based on the above weighted grids, we also develop two approximation algorithms to find the minimal exposure path for the directional sensitive model. We conduct extensive simulations to validate and evaluate our proposed models and algorithms.

关键词： Wireless sensor networks

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Variational Bayesian framework for estimating parameters of integrated E/MEG and fMRI model

Variational Bayesian framework for estimating parameters of ...

引用

Medical Imaging 2009: Biomedical Applications in Molecular, Structural, and Functional Imaging

作者： Babajani-Feremi, Abbas Bowyer, Susan Moran, John Elisevich, Kost Soltanian-Zadeh, Hamid Image Analysis Lab. Radiology Department Henry Ford Hospital Detroit MI 48202 United States Neuromagnetism Lab. Neurology Department Henry Ford Hospital Detroit MI 48202 United States Department of Neurology Henry Ford Hospital Detroit MI 48202 United States Control and Intelligent Processing Center of Excellence Electrical and Computer Engineering Department University of Tehran Tehran 14395-515 Iran

ISBN: (纸本)9780819475138

The integrated analysis of the Electroencephalography (EEG), Magnetoencephalography (MEG), and functional magnetic resonance imaging (fMRI) are instrumental for functional neuroimaging of the brain. A bottom-up integrated E/MEG and fMRI model based on physiology as well as a method for estimating its parameters are keys to the integrated analysis. We propose the variational Bayesian expectation maximization (VBEM) method to estimate parameters of our proposed integrated model. VBEM method iteratively optimizes a lower bound on the marginal likelihood. An iteration of the VBEM consists of two steps: a variational Bayesian expectation step implemented using the extended Kalman smoother (EKS) and the posterior probability of the parameters in the previous step, and a variational Bayesian maximization step to estimate the posterior distributions of the parameters. For a given external stimulus, a variety of multi-area models can be considered in which the number of areas and the configuration and strength of connections between the areas are different. The proposed VBEM method can be used to select an optimal model as well as estimate its parameters. The efficiency of the proposed VBEM method is illustrated using simulation and real datasets. The proposed VBEM method can be used to estimate parameters of other non- linear dynamical systems. This study proposes an effective method to integrate E/MEG and fMRI and plans to use these techniques in functional neuroimaging. © 2009 SPIE.

关键词： Electroencephalography

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Compiler/hardware assisted application code and data security in embedded systems

Compiler/hardware assisted application code and data securit...

引用

Conference on Digital Avionics Systems (DASC)

作者： Chunguang Bu Xiang Wang Chi Zhang Jizhong Liu Xiaodong Wang Baosen Li School of Electronic and Information Engineering Beihang University Beijing China Aerospace Intelligent Control National Key Lab. of Sci. and Tech. on Beijing China

Embedded systems have stepped deeper into Integrated Avionics systems, and security is becoming an important concern. Most embedded systems present a number of software vulnerabilities, such as buffer overflows. Furthermore, the rapid growth and pervasive use of embedded systems makes it easier for a sophisticated attacker to gain physical access to launch physical attacks on insecure off-chip main memory. This paper presents a novel compiler/hardware assisted application code and data protection architecture (CHCDP) to monitor the execution of application. The compiler extracts the control flow and static data integrity validation information using hashing and cyclical redundancy check (CRC) integrity algorithms at compile time. The dynamic data integrity validation is generated in the process of application execution. Likewise, the function return address and frame point are also protected at runtime. The designed hardware observes its dynamic execution trace and checks whether the trace conforms to the permissible behavior. And it will trigger appropriate response mechanisms if finding a mismatch. An OR1200 processor is assigned to build a system on a programmable chip (SOPC) that implements the architectural design. The experimental analysis shows that the proposed techniques can eliminate a wide range of common software and physical attacks with low performance penalties and minimal overheads.

关键词： Hardware Data security Embedded system Application software Protection Cyclic redundancy check Aerospace electronics Embedded software Buffer overflow Computer architecture

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