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In service-oriented mobile social networks (S-MSN), many location-based services are developed to provide various applications to social participants. Services can in turn be composed with the help of these participants. However, the composite structure, the subjective interpretation of trust demand, and the opportunistic connectivity make service composition a challenging task in S-MSN. In this paper,...
The effects of tank sloshing are usually ignored or linearized in ship motion analysis. Recent studies show that the nonlinearity caused by the coupling of tank sloshing and ship motion can be significant in a certain frequency range. The tank sloshing can be excited by the ship motion, at the same time, the tank sloshing induces an impact load on the tank wall, which has a significant influence on...
In this paper, a new integrated weight particle filter (IWPF) algorithm is proposed based on the combination of correlation particle estimation (CPE) weight and sequential importance re-sampling (SIR) weight. This method can reduce degeneracy phenomenon and re-sampling times of traditional particle filter. By choosing the typical nonlinear system model, the simulation results show that IWPF performs...
This paper presents a novel hand gesture recognition method based on Principal Directional Features (PDF). The image sequence is captured using a fixed mounted monocular camera to recognize dynamic gestures. Haar-like feature based cascaded classifier is used for hand area segmentation. Text based Principal Directional Features are extracted from the segmented images. Longest Common Subsequence algorithm...
Dynamic service composition in wireless environment provides us with a promising approach to build complex applications based on the basic value-added services. In different network domains, multiple services may provide data with different security levels. In order to prevent from information leakage, information flow security is a major concern in composite services. However, the energy-limited...
For the respective performance characteristics of the global positioning system (GPS) and inertial navigation system (INS), a tightly coupled GPS/INS integrated navigation system based on the pseudo-distance difference was proposed. The paper presents the detail study and theoretical analysis of the kalman filter algorithm for the GPS/INS integrated navigation system, and focuses on the establishment...
The relationship between resonant control and repetitive control is investigated in this paper. Resonant control and repetitive control are compared by using them to an active power filter (APF). The stability and design of parameter with the two control methods in APF system are analyzed, and the steady-state error and transient response are also analyzed for them. The theory is verified by experiment.
It is an interesting topic to study decentralized control algorithms for a group of agents to achieve a class of collective circular motion, or called torus. An algorithm was proposed in [1] where no global beacon information is required, however, the agents are homogeneous. In particular, it was assumed that the agents have a common nominal rotation radius and share a common reference frame. In this...
Trust in Peer to Peer network has the fuzzy feature, and thus it cannot be described and handled using distinct mathematic model. To solve the problem, based on the advantage of using intuitionistic fuzzy theory to handle vague information, we propose a novel P2P trust model named IFTM (Intuitionistic Fuzzy theory based Trust Model), which uses membership, nonmembership and hesitancy degree to describe...
The differential pressure exported by the averaging Pitot tube is small, it requires an expensive micro-scale differential pressure transducer with very good performance. In order to overcome this drawback, a rotameter was used to take place of the differential pressure transducer in the paper. The rotameter and the main pipe are in parallel lines, so that the rotameter is a by-pass pipe. The scale...
In this paper, numerical simulation of three- dimensional flow field of a vertical-type liquid- continuous impinging stream reactor (VLISR) was carried out by FLUENT software, its fluid movement regulation was studied, and the distributions of pressure and velocity were analyzed. This method is convenient and easy with a reliable result compared to engineering practice. In addition, the change of...
The pulse-width modulated valve (PMV) plays an important role in the whole electro-hydraulic automatic control system. In this paper, the magnetic field of the axially symmetric plane model simplified of the PMV is simulated with the magnetic finite element, thus accurate results on the distribution of magnetic field and flux-line can be obtained, as well as variation of the magnetic force and inductance...
The PWM solenoid is the critical component of the shift control system. To reduce the electronic flow and power consumption, as well as to offset the influence of the fluctuating voltage and temperature, research on the control characteristic of the PWM solenoid was conducted. After the introduction of the structure and usage of PWM solenoid, the flow equation when it is open and close was established...
The research proposes a path selection algorithm for multihomed hosts attached to Heterogeneous Wireless Networks (HWN) for maritime wireless communications. We first review the state-of-the-art of the Multihoming technology and explain rationale behind Multihoming. The Multiple Attribute Decision Making (MADM) is also introduced to address the importance of multiple attributes for path selection...
Stereo reconstruction is an important research and application area, both for general 3D reconstruction and for operations like robotic navigation and remote sensing. This paper addresses the determination of parameters for a stereo system to optimize/minimize 3D reconstruction errors. Previous work on error analysis in stereo reconstruction optimized error in disparity space which led to the erroneous...
According to the matrix representation of cubic NURBS surface, this paper presents a G1 continuity sufficient condition for common intersection point of three patches of adjacent cubic NURBS surface and provides specific algorithm for control points and weights of cubic NURBS surface.
This paper puts forward a least significant bit (LSB) matching steganography detection method based on statistical modeling of pixel difference distributions. Based on the Laplacian model of pixel difference distributions, this paper proposes a method to estimate the number of the zero difference value using the number of non-zero difference values from stego-images, and uses the relative estimation...
Pulse signal is the non-stationary random signal, the signal denoising is an important task before analyzing it. Based on wavelet thresholding denoising method presented by Donoho, a new compromising threshold function is proposed. Compared with classical thresholding denoising methods, it overcomes the discontinuity of the hard-thresholding method and reduces the fixed deviation between the estimated...
An autonomous navigation method for GEO satellites is presented. This method takes advantage of the characteristics of GEO satellites to overcome the shortcoming of the X-ray pulsar measurements: The satellite's orbit dynamics equation is built up in the Earth-fixed reference frame, so that the equation is weakly non-linear and the extended Kalman filter (EKF) is used in this method in spite of the...
In this paper, a new steganalytic method based on statistical distribution of pixel differences is proposed, which is designed to detect the presence of spatial LSB matching steganography in high-resolution natural images. This paper establishes a statistical model for the distribution of pixel differences in natural images based on the Laplacian distribution and estimates the number of zero pixel...
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