Hypertree decomposition is a powerful technique for transforming near-acyclic CSPs into acyclic CSPs. Acyclic CSPs have efficient, polynomial time solving techniques, and so these conversions are of interest to the constraints community. We present here an improvement on the opt-k-decomp algorithm for finding an optimal hypertree decomposition. Abstract Hypertree decomposition is a powerful tec...

introduction various factors like climatic conditions, vegetation, soil properties, topography, time, plant residue quality and crop management strategies affect the decomposition rate of organic carbon (oc) and its residence time in soil. plant residue management concerns nutrients recycling, carbon recycling in ecosystems and the increasing co2 concentration in the atmosphere. plant residue d...

Complexity’ and ‘crisis’ have become synonyms in the (brief) history of Software Engineering. The terms ‘component’, ‘decomposition’, ‘structure’ and ‘architecture’ have been associated with methods and techniques proposed over the years to defeat the crisis, from structured programming to object/component based programming and, more recently, service-oriented architectures. This chapter discus...

We reconsider the M/M/∞ queue with two-state Markov modulated arrival and service processes and the singleserver retrial queue analyzed in Keilson and Servi [1]. Fuhrmann and Cooper type stochastic decomposition holds for the stationary occupancy distributions in both queues ([1] and [2]). The main contribution of the present paper is the derivation of the explicit form of the stationary system...

‎‎in this article‎, ‎a new method is introduced to give approximate solution to van der pol equation‎. ‎the proposed method is based on the combination of two different methods‎, ‎the spectral adomian decomposition method (sadm) and piecewise method‎, ‎called the piecewise adomian decomposition method (psadm)‎. ‎the numerical results obtained from the proposed method show that this method is an...

the potential energy hyper surfaces (fes) of the unimolecular rearrangements of a) nitromethane itei totrans acknitromethane b) nitrometharie (/) to methyl nitrite (3) and c) naromethane decomposition tomethyl and nitrogen dioxide were searched using the ab !nth° mp2 method. split valence 6-310(d.p) basisset was used for geometry optimizations, frequency and 1rc computations along each reaction...

We obtain a decomposition result for the steady state queue length distribution in egalitarian processor-sharing (PS) models. In particular, for an egalitarian PS queue with K customer classes, we show that the marginal queue length distribution for class k factorizes over the number of other customer types. The factorizing coefficients equal the queue length probabilities of a PS queue for typ...

A method is proposed to assist participants in the design of complex integrated models for engineering design. The approach builds on the DOME (Distributed Object-based Modeling and Evaluation) framework, which is intended to facilitate the creation of integrated models by allowing groups of designers to link services of models encapsulated by distributed objects. The aim is to provide a tool f...

We study an infinite-server fork-join queueing system with dependent services, which experiences alternating renewal service disruptions. Jobs are forked into a fixed number of parallel tasks upon arrival and processed at the corresponding parallel service stations with multiple servers. Synchronization of a job occurs when its parallel tasks are completed, i.e., non-exchangeable. Service times...

Wood is a renewable resource and promising construction material for the growing bio-based economy. Efficiently utilising wood in built environment requires comprehensive understanding of dynamics regarding its usability. Durability an essential property to consider, as various types exposure create conditions deterioration through biotic abiotic agents. Biodegradable materials introduce increa...