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This paper focuses on the second-order statistics analysis for a cooperative cognitive radio network with Nth best relay (CCRN-NthR) based on reactive decode-and-forward (RDF) protocol. The second-order statistics include average outage rate (AOR) and average outage duration (AOD). To these ends, we first obtain the exact closed-form expressions for the AOR and AOD of the equivalent end-to-end SIR...
The outage performance of decode-and-forward cognitive ratio opportunistic relay (DF CR-OR) systems is investigated over Rayleigh fading environments. We specially consider the case where the systems are impaired by the imperfect channel state information (CSI) between the secondary users and the primary user, and by the co-channel interference (CCI) at secondary relays and destination. We first obtain...
Reliability test is the important means to improve the software reliability and to assure the software quality. In this paper, aimed at the Beidou receiver DSP embedded software, introduced the main test module and the test method for its unit testing, integration testing and system testing, and presents a reliability assessment method through indirect indicators test, thus design a set of reliability...
To reduce carbon emission more efficiently and effectively, Cap-and-Trade (C&T) and some compulsory environmental regulations are gradually implemented around the world, which brings huge challenges to generating companies. How to balance between production quantity, green improvement and carbon trade under C&T condition becomes an important decision for generating companies. A non-linear...
The paper presents an iterative process to calculate the voltage magnitudes and phase angles at each bus in a power network for each harmonic frequency (include fundamental frequency). The method indicated in the paper is based on Newton-Raphson method. A six-pulse line commutated converter and a twelve-pulse phase control delta-star connected converter are studied. They are regarded as harmonic sources...
With the development of modern electricity equipment, voltage dips may bring more and more economic losses, which need a proper method of evaluation. In this paper, a time varying quality loss function, utilizing the Tobit model, is used to predict economic losses due to voltage dips. This quality loss function is more flexible and closer to practical situation.
This paper proposes an approach to calculate available transfer capability (ATC) for AC/DC systems taking transient stability constraints into account. The ATC calculation is modeled as the maximizing electric load increase of receiving region, subject to equality constraints and inequality constraints of the DC system and the AC system. The power transfer between the sending region and the receiving...
The method to determine the size distribution of nanosized ferrofluid by optimizing the discretization strategy used in calculations is demostrated in this paper. The discretization strategy is achieved with a modified optimal quantization theory to eventually reduce the ill-posed property of the magnetization numerical model. The optimization then enables the suppression of artificial oscillation...
With the expansion of the power systems, DC power transmission has been increasingly applied in interconnection of grids. The determination of Available Transfer Capability (ATC) for the AC/DC transmission systems is significant to the system planning and operation. So far, most studies have been focused on ATC determination for AC transmission systems, few are on the AC/DC system ATC determination...
We investigate a new parallel preconditioning technique in the iterative solution of large sparse linear system arising from electromagnetic scattering simulation involving three-dimensional conducting bodies with arbitrary shapes. Previous studies are focused on using static or matrix pattern based incomplete LU (ILU) preconditioners in a localized preconditioner implementation. Our current studies...
With the increasing expansion of AC/DC transmission system scale, the research on available transfer capability (ATC) for AC/DC transmission systems has important academic and practical significances to AC/DC transmission system planning, operation and reliability evaluation. However, most of the present researches on the ATC calculation are only suitable for AC transmission system, few is about the...
Expanding the extra high voltage AC/DC hybrid transmission system and improving the transfer capability of the network are the primary tasks of the power network in China. With the increasing expansion of AC/DC transmission system scale, the super large scale hybrid network has taken shape in china, then the systematic research on ATC calculation model and algorithm for AC/DC systems is urgently needed...
This paper presents a novel and improved three-dimensional plane wave time domain (PWTD) algorithm. PWTD schemes constitute extensions of frequency domain fast multipole methods to the time domain, and permit the fast evaluation of transient wave fields generated by bandlimited sources. Previously, we demonstrated the equations pertinent to the analysis of electromagnetic scattering problems. Implementation...
Time-domain integral equation solvers are highly suited for analyzing the performance of coupled circuit-electromagnetic (EM) systems when broadband information is required or nonlinearities in the system have to be modeled accurately. In this paper, we present a novel coupling scheme for hybridizing TDIE with modified nodal analysis (MNA) used in circuit simulation of linear and nonlinear circuits...
The geometric concepts of outer containing cylinder for space finite points have frequently been introduced into the evaluation of molding error of cylinder surface in the operation of mechanical manufacturing and mold processing. Since space finite points obviously consists of numerous outer containing cylinders, a mathematical model is built to find the minimum outer containing cylinder in this...
Type-1 OWA operators provide an efficient way of aggregating linguistic opinions in the form of type-1 fuzzy sets for decision-makers. Like in Yagerpsilas OWA operations, the identification of an appropriate type-1 OWA operator, i.e., to determine the linguistic weights in the form of type-1 fuzzy sets, is crucial in type-1 OWA based aggregation. Indeed, these weights reflect the decision-makerspsila...
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