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In this paper, we propose an algebraic approach to design extremely low rate low-density parity-check (LDPC) codes by employing the primitive polynomials. We first investigate the requirements for the polynomials to construct 4-cycle free LDPC codes and then propose an algebraic approach to design the parity check matrix. To achieve a better decoding performance in the extremely low rate region, we...
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...
Risk, existing in various forms during the process of Colleges and Universities' Sci-tech Innovation (CUSTI): the project application period, the project development period and the achievement transformation period, is a vital reason that restricts the innovation at colleges and universities. Fuzzy evaluation model is constructed and empirically operated based on the characteristics of CUSTI's achievement...
The assessment of the limb mobility of stroke patients is an essential part of poststroke rehabilitation. Conventionally, the assessment is manually performed by clinicians using chart-based ordinal scales, which can be subjective and inefficient. By introducing quantitative evaluation measures, the sensitivity and efficiency of the assessment process can be significantly improved. In this paper,...
It was exposed to excessive drought from winter in 2009 to spring in 2010 at Southwest China. Regional sensitive evaluation system of biological invasion was built up with indexes such as ratio of invasion area, diffusing distance, spreading manner and resistance of local biological community. And then the impact of excessive drought on regional sensitivity of Eupatorium adenophorum invasion in Yunnan...
The issue of power quality in the distribution system is always in sense of the concern. With the high penetration of distributed generation (DG) currently, it tends to be more complicated. This paper presents a new approach to evaluate impacts of the DG on power quality of the distribution network. In the process an objective function will be modeled, which will be solved by the optimization toolbox,...
Of the many peer-to-peer (P2P) systems in existence, BitTorrent is one of the most appealing that has managed to attract millions of users in the past few years. In this paper we present an extensive study of BitTorrent availability through measurement and analysis. Previous studies are limited to tracker without distributed hash tables (DHT), which have been used widely already. We first discuss...
The aim of this paper is to deal with the resource-constrained multiple project scheduling problems (rc-mPSP) with fuzzy coefficients, which is well known one of NP-hard problems, by a hybrid genetic algorithm with fuzzy logic controller (flc-hGA). The objective in this paper is to minimize total project time in the project. Because traditional optimization techniques canpsilat cope with the rc-mPSP...
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