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Concurrent multipath transfer (CMT) can improve data throughput, bandwidth resource utilization and system robustness. Whereas, CMT also leads to serious reordering problem, especially in heterogeneous wireless networks. Since more than one path are used, an efficient CMT scheduling algorithm is needed at the sender. For existing packet scheduling, packet's rate of entering the sender queue is usually...
The Peer-to-Peer (P2P) network has grown significantly over the last few years. To improve the performance of P2P network, hybrid P2P network arranges a Super-Node (SN) and some Ordinary-Nodes (ONs) into a group, where SN acts as a central server to the ONs. Thus, an SN bears load generated by all ONs in its group. Therefore, it is important to balance load among SNs to provide quality service. While...
In this paper, the problem of determining the maximum throughput and minimum delay for ensuring the Quality of Service(QoS) of second users(SUs)is investigated for the cognitive network. A markov chain modeling working status of SU has been established. We analyze the special case of the competitive SUs to sense and access the available spectrum channel. We assign the idle channel to the user who...
With the development of smart substations, much attention has been focused on the transient magnetic field (TMF) generated during switching operation in substations. In order to study the TMF, a portable integrated system based on Anisotropic Magneto-resistive (AMR) sensor has been developed. The system mainly consists of magnetic probe, sampling card, and industrial computer. A GPS has also been...
As the rapid development MEMS (micro-electromechanical systems) packaging technology and magnetoresistance material technology, MR (magnetoresistive) sensors based on magnetoresistance effect which can carry out point measurement of magnetic field may change the measurement techniques in power systems. The currently available fault location of overhead transmission line approaches are mainly based...
Online monitoring of power devices' state is a very important part of the Smart Grid (SM) building plan. Icing on the overhead transmission lines cause great accidents and vast economic loss. In China, icing monitoring technology and relative research is a hot point. The current operating icing monitoring systems based on electrical measurement do not work efficiently because it cannot solve the problem...
Spectrum sensing is an essential task in cognitive radio technology. Most of current detectors take the noise power as prior knowledge which makes the detection performance sensitive to noise uncertainty. In this paper, we propose an F-test based detector to overcome this problem. The proposed approach is robust to noise mismatch and requires low computational complexity. Based on the table of F-distribution,...
Aiming at the uncertainty of external financing environment and the fuzzy of financing risk for high-tech enterprises, fuzzy support vector machine using particle swarm optimization (PSO-FSVM) for high-tech enterprises financing risk assessment is proposed. This optimization mechanism combined the discrete PSO with the continuous-valued PSO to simultaneously optimize the input feature subset selection...
Trilateral haptic systems can be modeled as three-port networks. Analysis of coupled stability of a three-port network can be accomplished in either the passivity or the absolute stability frameworks assuming all three ports are connected to passive but otherwise unknown terminations. This paper first reviews our recent results in terms of passivity and absolute stability criteria for general three-port...
Prompt and accurate location of faults in a large-scale transmission system can accelerate system restoration, reduce outage time, and improve system reliability. Traditional approaches are categorized into traveling-wave-based and impedance-based measurement techniques. The traveling-wave-based approach requires detection devices to connect to the high-voltage transmission line, making the solution...
This paper proposes a control strategy which is combined with a novel decoupling control and negative sequence correction strategies. Firstly, based on superimpose theory, the coupled relationship between three-phase output voltage and three-phase sinusoidal pulse width modulation (SPWM)control wave is deduced. Secondly, according to symmetrical component decomposing theorem, mathematical expressions...
As widely-used energy transform device, inverter plays important role in microgrids and distribution generation (DG). Generally, according to its control object, inverter's controllers can be classified into at least three kinds: constant PQ, droop control and synchronverter (SV) or virtual synchronous generator (VSG). In this paper, an improved synchronverter model is presented. By means of powerful...
Digital Signal Processors (DSP) based on Residue Number System (RNS) are superior to conventional DSP especially in terms of parallel signal processing and power consumption. For modern state of the art biomedical applications, signal processing efficiency and robustness are of paramount importance. Therefore, the huge silicon overhead area and high power consumption of traditional Analog-to- Digital...
A cloud based outside available parking spaces query service system is proposed. The concept of user pay the fee is considered to create the service system. The data available on the system database are collected from both of the active and passive ways. For the active way, detectors installed on a periodically routing vehicle will provide the data. For the passive way, the data is from the feedback...
Compared with fossil fuel vehicles, plug-in hybrid electric vehicles (PHEVs) and electric vehicles (EVs) maintain obvious and profound significance for the less city pollutant and operation noise. Moreover, EVs can benefit operation of the power systems via friendly feeding back the energy stored in the EV batteries into the grids when needed. The related research about charging of batteries for EVs...
Residue Number System (RNS) offers significant advantages over conventional number system in terms of parallel signal processing and power consumption. This makes it ideally suitable for communication, computer security, digital signal processing, in which long word addition and multiplication are involved critically. However, traditional Analog-Digital (binary)-Residue conversion scheme requires...
During the last decade, the demand for content-based retrieval among the mass information continues increasing. Unfortunately, the traditional key words matching method has been useless. Therefore, how to retrieve the expected results in semantic level has become a tough challenge for information retrieval. Theoretically, many methods have been proposed to solve it, among which latent semantic analysis...
Based on P-O fit, self-efficacy and embeddedness theory, this study proposes a conceptual model of entrepreneurial intentions of IT professionals from an organizational ebmeddedness perspective. The model presents the complex interaction among organizational embeddedness, organizational entrepreneurial climate, entrepreneurial self-efficacy and entrepreneurial intention.
Direct drive for wind turbines is a relevant and challenging issue, hence they carry all of the advantages of gearless motion transmission. Nevertheless, they need customization for the housing of the position sensor. This sensor is often forced to work in hard, even extreme, environmental conditions, and it actually represents the most critical item for the drive reliability. In this case, the sensorless...
Power and energy supply has been faced with many challenges in the 21st century, accordingly the future development and innovation of power technologies is urgently needed. As a result of environmental pressures and energy shortage, human society needs to be powered by low-carbon or distributed sustainable energy, thus a conceptual smart grid with an originally created structure is brought forward...
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