University of Bojnord

Bojnord, Iran

University of Bojnord

Bojnord, Iran
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Jodat A.,University of Bojnord
Journal of Engineering and Applied Sciences | Year: 2016

Today, these countries consider energy optimization and management as a new energy resource. With respect to the increasing energy costs, costs reduction due to exergy fuel and loss is one of the greatest objectives of researchers and craftsmen. Exergoeconomic analysis helps designers find system performance in an affordable way that significantly contribute the analysis, design and optimization of thermal system. In the present study, the effect of various values of turbine input temperature, the ratio of compressor presser and output cooling temperature of generator to the second law return as well as the system costs rate have been investigated. In cycle optimization performed by genetic algorithm, after introducing the variables of designing and determining target functions, the optimal points indicating the highest return and the lowest costs rates were specified and the effect of each designing variables on target function were presented. As the findings revealed, total cost rate at the optimal state was reduced about 14% relative to the primary state. Also, it was found that there was a relation between unit cost and operational parameters change. Moreover, as the result of increasing compressor pressure, exergy losses at combustion chamber could be decreased, leading to the cost reduction. © Medwell Journals, 2016.

Paad A.,University of Bojnord
Annals of the University of Craiova, Mathematics and Computer Science Series | Year: 2016

In this paper, we introduce the concept of integral ideals in BL-algebras. With respect to concept, we give some related results. In particular, we prove that an ideal is integral ideal if and only if is Boolean and (prime)maximal ideal. Also, we prove that a BL-algebra is an integral BL-algebra if and only if trivial ideal f0g is an integral ideal. Moreover, we study relation between integral ideals and obstinate filters in BL-algebras by using the set of complement elements. Also, we describe relationship between maximal ideals in BL-algebras and locally finite MV -algebras.

Effati S.,Ferdowsi University of Mashhad | Saberi Nik H.,Ferdowsi University of Mashhad | Jajarmi A.,University of Bojnord
Nonlinear Dynamics | Year: 2013

The aim of this paper is to study the chaos, optimal control, and adaptive control of the hyperchaotic Chen system. In this paper, applying the Pontryagin's minimum principle (PMP), the optimal control inputs for the interested model are obtained with respect to the selected measure. A piecewise-spectral homotopy analysis method (PSHAM) is used for solving the hyperchaotic Chen system and the extreme conditions obtained from the PMP. Furthermore, an adaptive control approach and a parameter estimation update law are introduced for the hyperchaotic Chen system with completely unknown parameters. The control results are established using the Krasovskii-LaSalle principle. Finally, numerical simulations are included to demonstrate the effectiveness of the proposed control strategy. © 2013 Springer Science+Business Media Dordrecht.

Ziaee M.,University of Bojnord
International Journal of Advanced Manufacturing Technology | Year: 2014

This paper deals with the flexible job shop scheduling problem with the objective of minimizing the makespan. An efficient heuristic based on a constructive procedure is developed to obtain high-quality schedules very quickly. The algorithm is tested on benchmark instances from the literature in order to evaluate its performance. Computational results show that, despite its simplicity, the proposed heuristic can obtain effective solutions in very short and nearly zero time and is comparable with even metaheuristic algorithms and promising for practical problems. © 2013 Springer-Verlag London.

Javadi S.H.,University of Bojnord
IEEE Aerospace and Electronic Systems Magazine | Year: 2016

The applications of sensor networks (SNs) are increasing since they facilitate real-time remote information monitoring and processing. Detection of an event is one of the main tasks of SNs in many applications. Sensors may transmit either raw or processed data to a fusion center (FC), where a final decision is taken. The problems and challenges that exist in detection over SNs and the previously proposed methods to deal with them are reviewed and described in this tutorial. © 1986-2012 IEEE.

Hedayatpour N.,University of Bojnord | Falla D.,University of Gottingen
Journal of Electromyography and Kinesiology | Year: 2012

Due to the variations in morphological and architectural characteristics of fibers within a skeletal muscle, regions of a muscle may be differently affected by eccentric exercise. Although eccentric exercise may be beneficial for increasing muscle mass and can be beneficial for the treatment of tendinopathies, the non-uniform effect of eccentric exercise results in regional muscle damage and as a consequence, non-uniform changes in muscle activation. This regional muscle weakness can contribute to muscle strength imbalances and may potentially alter the load distribution on joint structures, increasing the risk of injury. In this brief review, the non-uniform effects of eccentric exercise are reviewed and their implications for training and sport are considered. © 2011 Elsevier Ltd.

Ziaee M.,University of Bojnord
Information Sciences | Year: 2013

This paper proposes a new heuristic method for the general flowshop scheduling problem with the due dates and the sequence dependent setup times (SDSTs) where the objective is to minimize the total weighted tardiness. The approach consists of two phases: in the first phase, a permutation sequence is obtained and this sequence is then improved by a non-permutation local search in the next phase. Using some well-known standard benchmark problems, we examine the performance of the proposed algorithm and our computational results indicate that, despite its simplicity, the proposed heuristic approach provides better solutions than some other alternative methods. © 2013 Elsevier Inc. All rights reserved.

Ziaee M.,University of Bojnord
Journal of Supercomputing | Year: 2014

The distributed manufacturing takes place in a multi-factory environment including several factories, which may be geographically distributed in different locations, or in a multi-cell environment including several independent manufacturing cells located in the same plant. Each factory/cell is capable of manufacturing a variety of product types. An important issue in dealing with the production in this decentralized manner is the scheduling of manufacturing operations of products (jobs) in the distributed manufacturing system. In this paper, we study the distributed and flexible job-shop scheduling problem (DFJSP) which involves the scheduling of jobs (products) in a distributed manufacturing environment, under the assumption that the shop floor of each factory/cell is configured as a flexible job shop. A fast heuristic algorithm based on a constructive procedure is developed to obtain good quality schedules very quickly. The algorithm is tested on benchmark instances from the literature in order to evaluate its performance. Computational results show that, despite its simplicity, the proposed heuristic is computationally efficient and promising for practical problems. © Springer Science+Business Media New York 2013.

Bakhshi M.,University of Bojnord
Soft Computing | Year: 2016

In this paper, the algebraic properties of tense operators on a non-commutative residuated lattice are investigated. First, some examples and basic properties are given. Next, it is proved that the Dedekind–MacNeille completion of a tense non-commutative residuated lattice is again a tense non-commutative residuated lattice, together with suitable operations. In the sequel, the concept of tense filter is introduced and some structural theorems are given. Several characterizations of normal tense filters and maximal tense filters are obtained, as well. Also, some characterizations of tense non-commutative residuated lattices using normal tense filters are given. © 2016 Springer-Verlag Berlin Heidelberg

Bakhshi M.,University of Bojnord
Journal of Intelligent and Fuzzy Systems | Year: 2016

In this paper, we introduce the notion of a nodal filter in residuated lattices. We give several characterizations of these filters and also some relationships between these filters and other types of filters are obtained, as well. Finally, we prove that the class of all nodal filters of a residuated lattice forms a Heyting algebra. © 2016 - IOS Press and the authors. All rights reserved.

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