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In order to improve the multi-target tracking performance of Doppler radar in the presence of Doppler blind zone (DBZ), the detection probability model with minimum detectable velocity (MDV) is incorporated into Gaussian mixture cardinality balanced multi-target multi-Bernoulli (GM-CBMeMBer) filter. After integrating the new detection probability model into the multi-target posterior density of the...
In this paper, we propose a dynamic resource optimization scheme for a heterogeneous wireless network combining with a radio frequency (RF) access point (AP) and multiple visible light communication (VLC) APs. For adapting to the stochastic media content arrival rates and dynamic wireless channel conditions, a two-timescale stochastic network resource optimization problem is formulated by employing...
In eddy current testing, coil carrying AC current is used as a sensor to detect defects in the conductor. It is an important problem to analyze the impedance variation of the coil when the probe scanning along the surface of conductor. The accurate expression for the impedance variation of the coil above conductive plates is derived in the integral form by means of the double Fourier transformation...
The electromagnetic NDT method plays an important role in the nondestructive material test. In testing conductive structures, the send-receive coils probe has more advantage than the absolute coil probe. One rectangular excitation coil is located above and parallel to moving conductive plate, another cylindrical pick-up coil is located on the opposite side across the moving conductive plate. The accurate...
Eddy current testing is an important non-destructive testing method in defect detection and material evaluation of conductor. In testing of multi-layer moving conductive plates, the excitation coil is cylindrical and parallel to the conductor, the cylindrical and rectangular coils are placed near the excitation coil serving as pick-up coil respectively. The accurate theoretical expressions of the...
In this paper, we design an energy-efficient cross-layer optimization framework for media streaming over time-varying wireless network. The energy efficiency (EE) is characterized by the stochastic optimization model subject to the network stability, which is also used to depict the average media delivery delay. In harmony with the hierarchical architecture of the wireless network, the problem of...
Based on the analysis of range-azimuth coupling in two dimensional frequency domain, a modified RD algorithm is proposed to account for the problem of SAR imaging with high squint angle. The measures of decoupling consist of second range compression (SRC), third order coupling compensation and range cell migration correction (RCMC). In addition, the type of RCMC is modified to eliminate target's movement...
In this paper, a fast content distribution scheme is proposed with QoS provisions and user cooperation in cellular networks. A group of mobile terminals (MTs), which are interested in the same content, can cooperate to reduce the content distribution time (CDT). The Nash bargaining solution was derived to formulate the content distribution problem, where each player of the game can maximize its individual...
Data mining deepens the data analysis, also is able to mine the interesting mode hiding in mass data automatically. As a new data analysis technology, data mining makes full use of the modern software technology and computer scientific knowledge, has the extremely important research significance, provides for researchers of various fields with a new intelligence means to realize and use data. In data...
This paper mainly discusses relevant issues about the development patterns of EC based on cloud-computing through six respects: fundamental theory, current situations, feasibility analysis, EC patterns, problems, and strategies. It will systematic explain how to explore brand new setup of EC using cloud-computing. In this paper, author elaborates carefully on the followings: which new pattern will...
Under the new organizational model SDOM(synchronic dynamic organizational model), a dynamic change method based on multi-group team working is proposed in this paper, process instance don't need change when changing members in one or more work nodes, only organizational model including operational staff and work flow need to be modified. In this way, requirements of dynamic change of work flow in...
In workflow management system of multi-group collaborative work, scheduling conflict is common, which hinder smooth operation of workflow engine. In this regard, the author proposes a new conflict detection mechanism which support simultaneous multi-group collaborative workflow, in which conflict detection algorithm runs before simultaneous collaborative work to examine whether there is scheduling...
In this paper, we propose an original pattern-based blind spatial image watermarking scheme. The pattern is generated via a key-vaulted operation on the original watermark image block, and then modified with a secret position key before it is inserted into the designated position. The strength of its robustness depends on two factors: one is the scale factor when added with the host pixels, and the...
EMD-like (exploiting modification direction, EMD) information hiding schemes have been recently drawn great interests from worldwide due to the feature of fully exploiting modification direction using some weighted sum functions or modulus operations. Schemes of this kind can usually achieve very high capacity of secret bits without causing too much distortion of the cover image, but suffer from sensitivity...
A novel single phase AC/AC variable frequency technology is presented, which is based on plugged pulse-chopping control scheme in this paper. The single-phase circuit topology is given, and the principle and control strategies are detailed. Compared with the traditional AC/AC variable frequency technology, its structure and control are simpler and cost is lower. Simulation under the PSPICE environment...
A novel representation framework has presented in this paper. It bases on a special type of Petri nets called Predicate/Transition (Pr/T) nets for describing reasoning about actions for robots. This framework blends together the concept of the state of the world, actions and the inner state of the agent. It is capable of describing reasoning about actions for robots which inhabit a dynamic and uncertain...
Wireless mesh networks (WMNs) are expected to be one of the next generation of wireless interconnection technologies. As to fully exploit the advantage of WMNs, a lot of research work has been done, e.g. new routing protocols, metrics, multiradio/multichannel WMNs, etc. In this paper we present a multiradio WMN testbed (called MR mesh) which was designed with purpose to study different routing protocols,...
A novel cycloconverter based on chopper scheme is proposed, which is entirely different from the former cycloconverters based on phase-shift control, so leading to higher power factor than that of the latter, also in price of minimum power device number. Two kinds methods are derived for determining the relationships between Duty-Cycle and other parameters by means of different Area-Equivalent criteria...
This paper proposes a new principle of variable frequency for AC-AC conversion, which operates below the half-frequencies of electric network like traditional cycloconverters, but very different from it in scheme. The new variable frequency principle is described by means of a well-known concept of amplitude modulation from microelectronics, and the waveform control mode adopts chopper scheme. Experiments...
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