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Common distributed storage systems use data replication to improve system reliability and maintain data availability, but at the cost of disk storage. In order to lower storage costs, data may instead be stored according to erasure codes, but this results in greater network and disk traffic when data blocks are reconstructed following an erasure. These methods are also passive, i.e., they only reconstruct...
MV switchgear are important pieces of the overall electrical distribution networks in public and industrial applications. Predictive maintenance of electrical switchgear involving condition monitoring has long been in practice. Recent improvements in the condition monitoring technology now allow for more data collection and trend analysis. This paper reviews various condition monitoring technologies...
This paper studied the SOC characteristics of the unplanned power failures in distribution network. In order to discover the SOC characteristics of the power failures, the statistical data of reliability in one middle-size city in China are presented firstly. The total interruption duration of customers and total interruption duration of system of unplanned power failures are considered as the variables...
This paper studies the energy efficient optimization for full duplex (FD) assisted closed-loop downlink transmission, where a FD base station (BS) serves multiple half duplex (HD) users in a time division multiple access manner. We optimize the durations of uplink training and downlink transmission, aimed at maximizing the energy efficiency (EE) of the system. We first show that the EE-optimal transmission...
As transistors' sizes of embedded memory continue to shrink and the valuable silicon is becoming the draining resources, it is the prevalent trend that multi-memory structures exist in the current SOC design to achieve better performance. Due to the imperfect manufacturing processes, it may introduce the faults to the designs. Built-In Self-Test(BIST) and Self-Repair(BISR) are the better test and...
The large-scale intermittent wind has been incorporated into current grid. in order to achieve transient angle stability quantitative analysis and evaluation, this paper proposes a fast assessment method of wind power generators and coal-fire power generators in transient angle stability control. Using the EEAC (extended equal area criterion) angle stability quantification theory, the defense vectors...
Cloud radio access network (C-RAN) opens up new opportunities to have a better resource management of mobile network on the basis of centralized processing. The fronthaul, which transfers signals between baseband units (BBUs) and remote radio units (RRUs), is confronted with bandwidth allocation problem when multimedia multicast technique is introduced. In this paper, we propose an algorithm using...
This paper proposes a novel LCLC full-bridge resonant converter with ZCS and ZVS for high-voltage high-frequency applications. In this operating model, both of ZCS and ZVS can be achieved and the switching losses can be reduced to a minimum. The proposed converter adopts the parasitic parameters of the step-up voltage transformer and one other serial capacitor is needed to form the resonant tank....
Combined with an HVDC transmission system closely, the voltage stability of the system is studied which is based on the sensitivity analysis method. First, a hybrid HVDC system sensitivity calculation method is deduced. On the basis of the method, the active and reactive power sensitivity matrix which is about the voltage amplitude of several AC transmission system important nodes to the DC channel...
In the calculation of AC / DC power flow, how to consider the control mode of HVDC transmission system effectively is a problem that must be considered in power system planning and operation. In this paper, based on the principle of equivalent power and AC / DC system alternating decoupling solving, a power flow calculation program is presented. The main control modes of HVDC transmission system and...
In this paper, we investigate the problem of maximizing the weighted sum energy efficiency (WS-EE) in downlink OFDMA smallcell network. To solve the problem in a distributed manner and reduce the complexity, we decompose the resource blocks (RBs) allocation and the power control into two subproblems. For the subproblem of RBs allocation, the optimal RBs allocation strategy is obtained based on rate...
In this paper, system throughput and user fairness for single-antenna user based on zero-forcing precoding are investigated with total power constraint (TPC) and per antenna power constraint (PAPC), respectively. By analyzing fairness of users signal to noise ratios (SNRs), the closed-form solution of fairness is obtained, and the tradeoff between system throughput and user fairness is presented....
This paper studies the mitigation of cross-tier inter-cell interference (ICI) generated by a macro base station to a small-cell user equipment (SUE) in heterogeneous networks. A full-duplex (FD) based successive ICI cancellation (SIC) scheme, called fSICIC, is devised by applying FD technique at the small-cell base station (SBS). The basic idea of the fSICIC is to let the SBS send the desired signal...
Traditionally, disk failure prediction accuracy is used to evaluate disk failure prediction model. However, accuracy may not reflect their practical usage (protecting against failures, rather than only predicting failures) in cloud storage systems. In this paper, we propose two new metrics for disk failure prediction models: migration rate, which measures how much at-risk data is protected as a result...
The evolution of cooperation in social dilemmas has always been a subject of considerable concern in various fields, such as economics, sociobiology and social science. Previous studies have shown that reputation can sustain cooperation in multi-player public goods games through indirect reciprocity. Unfortunately, most studies only consider the impact of personal performance, and while the effect...
In this paper, the performance of network codingbased gossip algorithms -- i.e. algebraic gossip algorithms -- is analyzed on random geometric graphs under static and mobile environments. The lower bounds for the convergence time of algebraic gossip algorithms are derived based on the conductance, and these bounds are O(n log n log ε -- 1 -- log n log ε -- 1) with node...
For industrial applications, availability of internal MV networks is of high importance. Facing often more severe environmental and installation conditions than the normal ones described in standards, it appears that one important parameter is the ability of MV switchgear to withstand harsh environmental conditions, without losing insulating performances. Shielded Solid Insulation Switchgear (2SIS)...
The quick response of inverter integrated distribution generation (HDG) source under fault makes the equivalent circuit of sequence network different from traditional power system. Based on the control strategy and the equivalent model of inverter integrated distributed generation (IIDG) under fault, IIDG source can be taken as voltage source or current source in sequence-network. With the analysis...
The effects of thermal aging and electromigration on the tensile strength and microstructure of SnAgCu micro-interconnection solder joints with different volume were discussed in this paper. The experimental results show that isothermal aging results in coarsening of the microstructure in the solder joint, and electromigration leads to micro-hole or micro-crack in the cathode interface, which bring...
Active matrix organic light emitting diode (AMOLED) displays based on amorphous indium-gallium-zinc oxide thin-film transistor (a-IGZO TFT) pixel circuit encounter problems as instability of threshold voltage (VT) under gate voltage bias-stress, the non-uniformity of mobility (μ) resulting from the large area TFT scale fabrication, and OLED degradation, etc. In this paper, we proposed a current compensation...
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