Performance analysis of multi computer system consisting of active parallel homogeneous clients
Ibrahim
Yusuf
Department of Mathematical Sciences, Bayero University, Kano, Nigeria
author
Abdullahi
Sanusi
School of Continuing Education, Bayero University, Kano, Nigeria
author
Abdulkareem
Ismail
Department of Mathematics College of Arts and Science, Kano, Nigeria
author
Muhammad
Isa
Department of Mathematics, Yusuf Maitama Sule University, Kano, Nigeria
author
Suleiman
K
Department of Mathematics, Yusuf Maitama Sule University, Kano, Nigeria
author
Shehu
Bala
Department of Mathematical Sciences, Bayero University, Kano, Nigeria
author
U.A
Ali
Department of Mathematics, Federal University, Dutse, Nigeria
author
text
article
2020
eng
Reliability is among the performance factors applied to multi computer systems consisting of active parallel hosts (clients) and a central server. For reliability evaluation and system performance, this study analyzed a multi computer system consisting of a three hosts (clients) connected to a central server. The system is configured as series-parallel system consisting of two subsystems A and B. Subsystem A consist of three clients working in parallel with each other while subsystem B consist of a central server. Both clients and server failure and repair time are to be exponentially distributed The system is analyzed using first order differential difference equations to derive the expressions for availability, mean time to failure, probability of busy period of repairman due partial or complete failure. The results are presented in tables and graphs. Reliability characteristics such as availability, MTTF, profit function as well as sensitivity analysis have been discussed. Some particular cases have also been derived and examined to see the practical effect of the model. The computed results are demonstrated by tables and graphs.
Annals of Optimization Theory and Practice
Firouzabad Institute of Higher Education
2588-3666
3
v.
2
no.
2020
1
24
http://aotp.fabad-ihe.ac.ir/article_113056_fd23be55a3b4bd33c98e358af02e067c.pdf
dx.doi.org/10.22121/aotp.2020.239383.1032
Optimal redundancy allocation for the problem with chance constraints in fuzzy and intuitionistic fuzzy environments using soft computing technique
Nabaranjan
Bhattacharyee
Department of Mathematics, Sidho-Kanho-Birsha University, Purulia
author
Rajesh
Paramanik
Department of Mathematics, Sidho-Kanho-Birsha University, Purulia
author
Sanat
Mahato
Department of Mathematics, Sidho-Kanho-Birsha University, Purulia
author
text
article
2020
eng
In some reliability optimization problem the constraints relations have probabilistic nature. These constraints are called the chance constraints and are difficult to handle up to some extent. The aim of this paper is to solve the reliability-redundancy allocation problem involving chance constraints in precise and imprecise environments. The component reliabilities of the system are imprecise numbers and further the constraints are stochastic type i.e., chance constraints. The genetic algorithm incorporated with stochastic simulation approach is implemented to optimize the system reliability. We introduced the fuzzy and intuitionistic fuzzy numbers to consider the impreciseness. In particular, component reliabilities are assumed to be triangular fuzzy numbers and triangular intuitionistic fuzzy numbers in two different environments. The simulation technique known as Monte Carlo Simulation is used to find the deterministic constraints from the stochastic ones. To transform the constrained optimization problem into unconstrained one we make use of the effective Big-M penalty approach. The problems are coded with real coded genetic algorithm. We have taken up some numerical examples to show the performance of the proposed method and the sensitivities of the GA parameters are also presented graphically.
Annals of Optimization Theory and Practice
Firouzabad Institute of Higher Education
2588-3666
3
v.
2
no.
2020
25
47
http://aotp.fabad-ihe.ac.ir/article_118830_33482e08a05481a01f593f392c9aa80e.pdf
dx.doi.org/10.22121/aotp.2020.250508.1042
Decision making under intuitionistic fuzzy metric distances
Kousik
Bhattacharya
Department of Mathematics, Midnapore College ( Autonomous), 721101, West Bengal, India
author
Sujit
De
Department of Mathematics, Midnapore College ( Autonomous), 721101, West Bengal, India
author
text
article
2020
eng
This article deals with qualitative difference between two intuitionistic fuzzy sets with the help of standard pseudo metric and metric spaces. Some definitions over metric spaces, pseudo metric spaces, intuitionistic fuzzy sets, indeterminacy and the formula of measuring metrices have been incorporated. Numerical illustrations, graphical illustrations, area of applications and ranking for decision making are discussed to show the novelty of this article. Finally, conclusions and scope of future works are mentioned.
Annals of Optimization Theory and Practice
Firouzabad Institute of Higher Education
2588-3666
3
v.
2
no.
2020
49
64
http://aotp.fabad-ihe.ac.ir/article_118831_40b7871b5d18aa18938177d37e8b9b53.pdf
dx.doi.org/10.22121/aotp.2020.250749.1043
On the shortest path calculation time in the large-scale dynamic post-disaster environment
Seyed
Shavarani
Department of Industrial Engineering, Eastern Mediterranean University, Famagusta, Turkey
author
Bela
Vizvari
Department of Industrial Engineering, Eastern Mediterranean University, Famagusta, Turkey
author
text
article
2020
eng
There are many metropolitan cities where serious disasters are expected. The disaster, especially if it is an earthquake, damages the roads structure. Thus, the shortest path between two points can be changed. Emergency vehicles, including ambulance, fire-engine, police car, and technical aid, must get the temporary shortest path in real time to work effectively. The shortest path algorithm available in MATLAB, Dijkstra, is tested on two metropolitan cities of San Francisco and Tehran. The road systems of both cities are represented by high number of nodes and connecting arcs. The conclusion is that the algorithm is suitable for finding shortest path for emergency vehicles. However, it is too slow for being a subroutine of a solver for vehicle routing problem.
Annals of Optimization Theory and Practice
Firouzabad Institute of Higher Education
2588-3666
3
v.
2
no.
2020
65
80
http://aotp.fabad-ihe.ac.ir/article_116560_385fccf2384f0f385ba62c2f9a2f780a.pdf
dx.doi.org/10.22121/aotp.2020.243077.1038
Automatic breast thermography images classification based on deep neural networks
Azza
mahmoud
Department of Basic Science, Faculty of Engineering, Pharos University, Alexandria, Egypt.
author
text
article
2020
eng
Breast thermography is a screening tool which is capable of detecting cancer at an early stage. The main objective of this work is using the full power of deep neural network (DNN) and exploring its ability to learn the discriminative features of input data. The transfer learning and data augmentation are performed to solve the problem of lack of labled data. To improve the accuracy, the support vector machine (SVM) classifier will hybrid with the convolutional neural network (CNN) instead of using the deep model as end-to-end. The performance is verified by the k-fold cross-validation. The proposed techniques are trained and evaluated on DMR-IR dataset to classify the thermographic images to normal and abnormal groups. The proposed technique of employing AlexNet hybrid with SVM achieves the best performance, producing 92.55% accuracy, 95.56% sensitivity, 89.80% precision, 92.63% F1 score.
Annals of Optimization Theory and Practice
Firouzabad Institute of Higher Education
2588-3666
3
v.
2
no.
2020
71
79
http://aotp.fabad-ihe.ac.ir/article_120067_7fe557967c1d153b0f73948db0b8ce39.pdf
dx.doi.org/10.22121/aotp.2020.251387.1046