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With the accelerating process of urbanization, rural migrant workers flood into the cities. Research projects that aim at resettlement and employment promotion of these workers, social stability, as well as economic development have drawn attention of government and scholars alike. With respect to the matching problems of urban employment of rural migrant workers, grey incidence analysis and two-sided...
A method is developed and introduced into simulation of waveforms scattered by a spherical shell covered by a visco-elastic layer. Both forward and backward scattered waveforms are investigated. Comparisons of the results and those without the visco-elastic layer show that the forward scattering strength is hardly affected by the visco-elastic layer no matter in a low or a high incident frequency,...
In this paper, we propose a novel secure transmission scheme for multiple-input multiple- output (MIMO) Two-Way relay channels, where multi- pair communication partners exchange information securely with the help of relay. By utilizing the properties of transmission medium in physical layer, our scheme can achieve high transmission efficiency as well as information theoretic security. With the secrecy...
With the development of large capacity variable speed constant frequency wind turbines, wind power converters with the multi-chip paralleled insulated gate bipolar transistor (IGBT) modules are widely used as an energy flow interface, a valid junction temperature calculation is vital considering the multichip electro-thermal influences, because thermal analysis is of great significance in terms of...
Grab structure performance will directly affect the reliability of the crane work. In this paper, we completed the structural design of the tower crane grab components, and analyzed the grab by finite element method in the most dangerous conditions. So The stress, strain and deformation value of the condition are obtained. Finding out the position of the grab most prone to damage and the defects of...
With the development of computer network technology, Sina micro logging platform have become the birthplace of the hot spots and important route of transmission. Due to the complexity of the network information, sometimes, it is necessary to control the spread of some of microblogging. The forwarding prediction system can make contribution to build a better microblogging environment. The used dataset...
To help integrate the utility-scale PV system into the power grid, the battery energy storage has been introduced as one promising scheme. With the rapid development of battery technology, the lithium iron phosphate (LiFePO4) battery has attracted attention in the renewable integration applications due to its high power and energy density. The main objective of this work is to analyze the performance...
We discuss in this paper whether two members in duopoly market will make benefit from dynamic pricing based on price discrimination. In addition, we want to know which one in duopoly market will make more profits through dynamic pricing in a pricing game. We set the case to a pricing game in Hotelling model where two firms will perform a fierce price war to grab the market share of switchers under...
According to the data feature of customer's consumption records of bank POS machine and the analysis depending on the actual requirements, a new modeling framework on consumption behavior of bank POS machines is presented in this paper, and further research on the implementation method of main aspects in the model is carried out. Firstly, we conduct data discretization and customer segmentation by...
In this paper, a non-invasive oil temperature measurement instrument, together with the oil temperature calculation model based on the pipe surface and ambient temperatures, is presented. In order to validate the model, a verification device was developed which can measure the oil, pipe surface and ambient temperatures simultaneously. A series of model verification and optimization tests under different...
This paper proposes a new social network model - Preference Memory Network (PMN) to overcome the common deficiency that existing network models do not take into account the heterogeneity of nodes and the memory feature on node connections preference. Experimental results shows that Preference Memory Network model have small-world, scale-free, high clustering coefficient and short average shortest...
Based on the traditional modeling method of the inverter-based microgrid, this paper makes some improvement on the state-space model to describe the microgrid more precisely. The coupling item, variation of common rotating angle, in the state-matrix of inverters model introduced by the common rotating reference frame are considered, which isn't simplified as the inverters individual part as before...
In order to meet the big data challenge of today's society, several parallel execution models on distributed memory architectures have been proposed: MapReduce, Iterative MapReduce, graph processing, and dataflow graph processing. Dryad is a distributed data-parallel execution engine that model program as dataflow graphs. In this paper, we evaluated the runtime and communication overhead of Dryad...
This paper presents a single-phase grid-connected photovoltaic (PV) module-integrated converter (MIC) based on cascaded quasi-Z-source inverters (qZSI). In this system, each qZSI module serves as a MIC and is connected to one PV panel. Due to the cascaded structure and qZSI topology, the proposed MIC features low voltage gain requirement, single-stage energy conversion, enhanced reliability and good...
This paper considers a kind of nonautonomous system of two species predator-prey system with double density restrict and stage-structure for prey. The sufficient conditions are obtained for guaranteeing the permanence of the system by Laypunov method. Then the existence and uniqueness of the positive almost periodic solutions for almost periodic systems are also discussed. Some new results obtained.
Aiming at the problem of estimation of secret message length in steganalysis, this paper presents a quantitative steganalysis method based on HMT (Hidden Markov Tree) and PLSR (Partial Least Squares Regression) to solve the problem. In this paper, three 2-State HMT models are modeled respectively for wavelet coefficients in the horizontal, vertical and diagonal directions. In order to calculate the...
According to the real practice of hospital outpatient operating rooms, the problem of process and capacity planning is analyzed by considering the rule of balancing and increasing the resource utilization; based on queuing theory, this paper brings out the outpatient operating room process upswing plan and establishes simulation models; then, this paper puts forward the total cost objective function...
To achieve a succesful electromagnetic interference simulation and analysis among lots of electromagnetic equipment deployed in wide range, passing the time-varying spectrum simulation parameters to each simulation terminal quickly and in time is a critical factor. This paper proposes an electromagnetic propagation simulation platform, in which all the simulation terminals acquire part of the simulation...
The influence of pilot error and aircraft failure on the safety of civil aircraft is investigated in this paper. Based on the human-machine system modeling technique, the modules in the pilot-aircraft system failure mode are built using objective-oriented technique, and the software system of civil aircraft safety evaluation is developed. A practical example of flight accident shows that the simulation...
As the important source of competitive advantage for culture industry, Service-oriented (SO) has attracted much research interest in academics and practitioners. Taking qualitative research method, the paper analyzes and demonstrates the influential factors in service-oriented of culture industry based on the survey data of Tianjin. On the basis of this, the conceptual model among service strategy,...
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