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To avoid large overvoltage when the current of the dc-link inductor is interrupted, overlap time is added to the drive signals in current source converters, which results in the extra harmonic in grid current. Waveforms of AC side current before and after added overlap time are achieved from analysis of the current commutation process. The expression of overlap current is given according to the pulse...
An analytical model is first proposed in this paper to study the performance of the medium-access control (MAC) protocol for safety applications in vehicular ad-hoc networks (VANETs). Two access schemes for VANET safety applications including random access and cluster-based access are considered. In the proposed analytical model, packet delivery ratio (PDR) and transmission delay are considered as...
A three-DOF steel frame model was built up by Matlab, to simulate damage and calculate its vibration response. Finally, amplitude jumps are found in the processed signals. the results show that damage detection on acceleration signal by using Wavelet Transform method is superior to on displacement and speed signal, the function of judging whether there are damages or confirming the moment the structural...
Performance prediction for the high performance computer system is of great importance for designing, implementing, and optimizing system. As a widely used technique for predicting performance, simulation method attracts more and more attention from the research community. Based on analyzing the problems in the current performance simulation techniques, we present a key idea of the performance simulator...
On the basis of the previous establishment of the testbed network structure for the emulated test, this paper focuses on the transmit power analysis of the practical network and the advanced testbed network for 3G/B3G systems. The advanced testbed structure was established previously by China Mobile Communication Corporation (CMCC). Theoretical analysis, system-level simulation, and outfield testing...
Hierarchical structure is one of the most ubiquitous structures in various networked complex systems. Cascading failures are common phenomenon in real-life systems and can occur in many infrastructure networks, including the hierarchical complex networks. In this paper, we propose a deterministic hierarchical network model which simultaneously possesses the small-world and scale-free properties. We...
In order to solve the problem that the existing resource allocation strategies cannot give integrative consideration to QoS, spectrum efficiency for mixed traffic, this paper proposes a utility-based resource allocation algorithm for mixed traffic in wireless networks. The unified utility function for users with different traffics is studied first. After that, the optimization model for the resource...
A novel information exchange scheme is proposed in this paper, which integrates Network Coding (NC) and Superposition Coding (SC) in two-way relay networks. The scheme focuses on the information exchange among more than two nodes through relay node in fewer time slots. Firstly, the Integrating Network Coding and Superposition Coding (INSC) scheme is proposed in scenarios with and without overhearing...
As a typical form of Cloud service, Software as a Service(SaaS) has been leading the adoption of Cloud to enable e-Business by the industries. There are growing number of SaaS services which could provide different aspects of capability enabling business to leverage Cloud platform to run and manage business processes, such as customer relationship management, supply chain management, finance and accounting...
During the expressed of the virtual battlefield situation, a lot of irregular objects have to be simulated. Particle system is an effect way for the modeling of fuzzy object, which need dynamic modeling. We expatiate on the application of the particle system from the aspect of tactics situation express and from two aspects: combat entity simulation and environment entity simulation, and analyzing...
We present a model using back-forward feed propagation method for tree diameter distribution in stand based on artificial neural network with three-tier management. This model is able to describe dynamics of diameter distribution in stands with high precision and good correlation. We also demonstrate that an ANN model from it has superiority in regression due to its ability to overcome some difficulties...
Spectrum aggregation (SA) is one of the potential LTE advanced technologies. The analysis and simulation for SA in LTE-Advanced system are addressed in this paper. We first analyze the system model of SA, and propose some evaluation methodologies for SA. Then the schedulers for SA with joint queue and disjoint queue are proposed. Finally, different traffic models are considered in the system level...
In designing a large inclined angle hydraulic support, the structure characteristics of four-bar linkage is presented, and ADAMS software is applied to four-bar linkage modeling and simulation. In order to attain optimal results, parameterized modeling and optimization is achieved, and the design results meets the practical requirements very well. By means of this virtual design method, the errors...
Four-bar linkage is one of the most important components of shield-type powered support or chock-shield-type hydraulic support. Parameterized modeling, simulation and optimization of four-bar linkage is firstly accomplished by use of ADAMS software in designing a large inclined angle hydraulic support. Then based on three-dimension model of the whole hydraulic support, applying COSMOS/Works software,...
In allusion to the reliability, which exists in the parametric design and optimizing process of the single hydraulic prop, this paper presents the new method in comparison with the traditional calculating and checking method for the reliability. The geometry model of the hydraulic prop is built firstly based on the 3D software, then analyzed and optimized by the finite element software - ANSYS. Results...
Mobile WiMAX based on IEEE 802.16e standard can realize enhanced network capacity requirements and various services as well as provide more novel experiences for users. Since WiMAX joining in 3G camp as the new member, the coexisting research of WiMAX and other 3G system (WCDMA, cdma2000 1x and TD-SCDMA) deployed in the same service area has gained increasing importance. In this paper, the detailed...
This paper presents a new algorithm to estimate the cyclo-period of a poly-cyclo-stationary signal. The algorithm is essentially based on the time-varying correlation and the variability method; a calculation of the sample variance ratio as a function of the modulated noise variance visually reveals a regular pattern, from which the poly-cyclo-period is obtained. Properties of the estimation method...
Software as a service (SaaS) provides software application vendors a Web based delivery model to serve big amount of clients with multi-tenancy based infrastructure and application sharing architecture so as to get great benefit from the economy of scale. Though SaaS application is usually developed with highly standardized software functionalities to serve as many clients as possible, many clients...
Quality is a key factor that affects the competence of supply chain, and collaborative quality innovation is an important way for a supply chain to improve its competence. However, a partner of the core enterprise in a supply chain may not have much incentive to innovate. In order to find an effective way to arouse the quality innovation enthusiasm of supply chain members, this paper adopts Bertrand...
Mobile WiMAX has become one of the 3 Generation communication systems and its performance has been widely evaluated. The physical overhead is a critical factor that may affect the overall performance significantly. But almost no attention has been paid to the impact of overhead on system performance yet. In this paper, we first analyze main signaling resources needed in physical layer, which consist...
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