In this paper, we study the performance of an adaptive and fixed transmission schemes where the transmission probability varies according to the evolution of the cluster formation procedure or is fixed for the entire network lifetime, respectively. Also, we propose a hybrid scheme where the transmission probability can either be fixed or adaptive according to the system’s conditions. In order t...

the paper is devoted to the study of brenstien polynomials and development of some new operational matrices of fractional order integrations and derivatives. the operational matrices are used to convert fractional order differential equations to systems of algebraic equations. a simple scheme yielding accurate approximate solutions of the couple systems for fractional differential equations is ...

Web caches are installed to reduce the receivers’ latency and save network bandwidth. These caches need to cooperate in order to improve their performance. A popular technique to make caches cooperate is by setting up a caching hierarchy. However, there are several problems associated with a caching hierarchy: i) every hierarchy level introduces additional delay, ii) redundant document copies a...

Certificateless cryptosystem is a hybrid scheme of traditional PKI and ID-based scheme and has positive aspects of both of PKI and ID-based cryptosystem, i.e. solving key escrow problem and certificate management problem simultaneously. Cryptographic schemes constructed in such a hybrid setting, generally called certificateless setting, retain these positive aspects and have been extensively st...

This paper proposes improved schemes for hybrid STBC systems. The hybrid space-time block codes (STBC) system is a combination of STBC scheme and SM scheme. It is aimed to obtain both diversity gain and spectral efficiency gain. In hybrid STBC, conventional schemes can’t achieve good BER performance of STBC symbols due to interference from other symbols. The proposed scheme improves BER perform...

We show that the bounded fragment of first-order logic and the hybrid language with ‘downarrow’ and ‘at’ operators are equally expressive even with polyadic modalities, but that their ‘positive’ fragments are equally expressive only for unary modalities. §

This paper presents a hybrid approximation scheme for the Max-SNPcomplete minimum-cost target coverage problem in wireless sensor networks. LP-rounding and set-cover selection are polynomial-time approximations for this problem. Our hybrid scheme combines these two methods using a crafted convex combination. We show that the hybrid scheme with appropriately chosen coefficients produces much bet...

Recently, hybrid modular multi-level converters, which are configured as full and half bridge sub-modules, are developed and utilized in the wide area of applications. Compared to its non-hybrid counterpart, these converters have several advantages such as the ability to nullify the DC side fault current and controlling AC side reactive power during the faults. This paper proposes a modified ph...

The range-separated hybrid density functionals are very successful in describing a wide range of molecular and solid-state properties accurately. In principle, such functionals are designed from spherically averaged or system averaged as well as reverse engineered exchange holes. In the present attempt, the screened range-separated hybrid functional scheme has been applied to the meta-GGA rung ...

This paper presents a novel hybrid algorithm based on particle swarm optimization (PSO) and noising metaheuristics for solving the single-source shortest-path problem (SPP) commonly encountered in graph theory. This hybrid search process combines PSO for iteratively finding a population of better solutions and noising method for diversifying the search scheme to solve this problem. A new encodi...