Research Title: Economic Evaluation of Transformer Selection in Distribution Systems
Author: Ayman Agha , Published Year: 2018
Jordan Journal of Electrical Engineering (JJEE), 4 (2)
Faculty: Faculty of Engineering

Abstract: This paper presents an approach to determine the total owning cost (TOC) of transformers. Different assumptions are introduced by discounting the transformer cost and/or the losses cost, using either A and B loss coefficients or the idea of annuity factor. Moreover, the paper presents a comparative study between different cases under different presumptions to evaluate the transformer's TOC. The obtained results confirm that the proposed approach equips the decision-maker with valuable and trustable criteria to select the proper transformer(s) based on the proposed practical cost criteria. The presumptions of the proposed cost criteria influence economic evaluation. The TOC of the transformer is also illustrated. Finally, the proposed approach cost criteria were illustrated through a numerical example. The obtained results have been summarized and discussed. Keywords—Losses coefficients, total owning cost, transformer economics, transformer losses.

Keywords: Losses coefficients, total owning cost, transformer economics, transformer losses.

Research Title: Operating Task Redistribution in Hyperconverged Networks
Author: Mohammad Alhihi, Mohammad Reza Khosravi, Published Year: 2018
International Journal of Electrical and Computer Engineering (IJECE), 10
Faculty: Faculty of Engineering

Abstract: In this article, a searching method for the rational task distribution through the nodes of a hyperconverged network is presented in which it provides the rational distribution of task sets towards a better performance. Using new subsettings related to distribution of nodes in the network based on distributed processing, we can minimize average packet delay. The distribution quality is provided with using a special objective function considering the penalties in the case of having delays. This process is considered in order to create the balanced delivery systems. The initial redistribution is determined based on the minimum penalty. After performing a cycle (iteration) of redistribution in order to have the appropriate task distribution, a potential system is formed for functional optimization. In each cycle of the redistribution, a rule for optimizing contour search is used. Thus, the obtained task distribution, including the appeared failure and success, will be rational and can decrease the average packet delay in the hyperconverged networks. The effectiveness of our proposed method is evaluated by using the model of hyperconverged support system of the university E-learning provided by V. N. Karazin Kharkiv National University. The simulation results based on the model clearly confirm the acceptable and better performance of our approach in comparison to the classical approach of task distribution.

Keywords: Redistribution, Hyperconvergence, E-learning, Penalty, Distributed Processing

Research Title: Method of Distribution Network Resources after Restoration, the Networks MPLS-TE Use of Various Telecommunications Technologies to Construct Backbone Networks
Author: Mohammad Alhihi, Published Year: 2017
Int. J. Communications, Network and System Sciences, 10
Faculty: Faculty of Engineering

Abstract: The modern telecommunication system is characterized by the rapid improvement of information and communication technologies, such as the improvement in the data rate, power consumption and Quality of Service (QoS). Based on this development, the next generation network (NGN) is shaped. The NGN is represented by a packet transport network demarcated functions and services. To provide transport functions in NGN, using Multi-Protocol Label Switching (MPLS) technology, there are two main problems, which are multipath routing and traffic distribution, which are what this paper works with. Accordingly, this paper proposes a solution to these two problems using optimization procedures to find the shortest path Dijkstra and Bellman-Ford, which is characterized by a high-speed-oriented selection of a single shortest path between the source and the destination, based on several selected criteria related to the optimal use of the network resources. Solving the information flow distribution problems in large number of nodes network applying salesman procedure or having NP-completeness, causes significant time delay, which means that the proposed solution is not suitable for real time applications. Accordingly, for real time applications, there is a need to move to other methods based on the use of several independent shortest paths.

Keywords: QoS, NGN, MPLS, Routing Protocols, Backbone Networks, BER, PEP

Author: Mohammad Alhihi, Published Year: 2018
journal Telecommuncations and radio engineering,
Faculty: Faculty of Engineering

Abstract: Remote sensing images are usually subject to compression for their further transmission, storage and dissemination. Because of lossy nature of compression, resulting images appear distorted. Degradations of image quality due to compression depend on noisy input image, a type and intensity of noise, and used image coder. To control image degradations, for a given coder, one should predict compression performance to be able to properly choose coder parameter(s). In this paper, we present pre-requisites for such a controlled lossy compression of noisy remote sensing images. The main attention is paid to image coders which are based on discrete cosine transform, due to relatively simple adaptation of its main parameter, quantization step, for controlling the effect of compression.

Keywords: lossy compression; noisy image; remote sensing; image coding

Research Title: Setting an Optimization Problem of Distributing Traffic Across Multiple Independent Paths
Author: Mohammad Alhihi , Published Year: 2017
Faculty: Faculty of Engineering

Abstract: Communication network development is considered as an urgent need for the world. The proposed work in this paper is to solve the problem of the traffic engineering, using the multi-path routing mechanisms by applying a developed algorithm includes a multi-criteria optimization procedure to define the optimal number of paths. The values of the maximum flow and multi-path delay are used as partial criteria; however, a set of particular criteria can be extended when needed to ensure the required quality of service.

Keywords: Routing Protocols, QoS, TN, hybrid network, traffic engineering, traffic distribution, path delay, the Dijkstra’s algorith

Research Title: Practical Routing Protocol Models to Improve Network Performance and Adequacy
Author: Mohammad Alhihi , Published Year: 2017
Journal of Computer and Communications, 5
Faculty: Faculty of Engineering

Abstract: The telecommunications network has become an essential facility of our daily life, which is the reason why a good number of the recent researches are directed to it. In this paper, the performance of routing protocols for selected network and the optimum way of utilizing the network resources is proposed, through improving the routing method protocols to obtain the most accurate communication models, which give the best network performance, taking into consideration that the protocol time interval to recalculate the future routing step is agreed to be our performance criteria, which is then used to determine the total amount of incoming traffic normalized at the best network performance with respect to the network capacity as well. Moreover, adaptive routing evaluation methods have been mathematically investigated in this work for telecommunication networks (TN), more precisely, developing the infrared radiation (IR) routing methods for hybrid TN applications, in terms of implementation conditions at a certain guaranteed quality of service, where we give a particular interest in analyzing routing methods based on the fact that the distribution information is contained in the routing variables, rather than in the state variables. The protocol that deals with the unbalanced traffic distribution over TN nodes has been investigated in this paper as well, and simulation results show good progress in the proposed protocol over the traditional protocols.

Keywords: Telecommunications Network, Routing Protocols, Hybrid Network

Research Title: Using the Clonal Selection Algorithm for the Synthesis of the Topological Structure for Data Network
Author: Mohammad Alhihi, Published Year: 2017
Jordan Journal of Electrical Engineering, 3
Faculty: Faculty of Engineering

Abstract: Abstract— A Genetic Algorithm (GA) is a high-level procedure applied to find, generate or select a good solution for an optimization problem, usually in imperfect or limited computation capacity, based on the Evolutionary Algorithms (EA). In this paper, we propose a clonal selection algorithm for the synthesis of a data transmission network topology, which unlike former works, depends on the model cost to determine the optimality value which solves the problem of distributing information flows in a network, and abilities of communication channels (available channel capacity). The proposed genetic synthesis algorithm solves the optimizing criteria, taking into account the optimal trade-off between the network dependability and cost. Finally, the algorithm was applied over the Jordanian cities where each city represents an algorithm node. The outcome of this application shows the gained improvement of the proposed algorithm.

Keywords: Clonal selection algorithm, Evolutionary algorithms, Genetic algorithm, Optimizing criteria

Research Title: Determining the Optimum Number of Paths for Realization of Multi-path Routing in MPLS-TE Networks
Author: Mohammad Alhihi, Published Year: 2017
Faculty: Faculty of Engineering

Abstract: Multi-Protocol Label Switching for Traffic Engineering (MPLS-TE) technology is an intelligent and advanced tool for handling traffic through the core networks and implementing new services based on virtual transport. Since MPLS-TE combines channel and network layer mechanisms, network administrators can optimally integrate and allocate the traffic loads while maintaining the speed of technologies such as Asynchronous Transfer Mode (ATM) technology. In this paper, the problem of the developed algorithm of multi-path routing which allows us to determine the optimum number of independent shortest paths is theoretically solved. In details, the article proposes a way for finding the set of shortest paths using Dijkstra's algorithm, and then determination of the maximum flow for each of the shortest paths based on the mathematical concepts and finally, introducing the solution of the multi-criteria optimization problem for a set of shortest paths. According to our approach, optimizing the use of resources in the core networks is possible with using the MPLS-TE technology.

Keywords: Communication Networks, Multi-Protocol Label Switching (MPLS), Traffic Engineering (TE), Routing Protocols, Next Generation Networks (NGNs)

Research Title: A New Approach for Load Loss Factor Estimation in Electrical Distribution Networks
Author: Ayman Agha, Published Year: 2017
Faculty: Faculty of Engineering

Abstract: This paper presents a new approach for the estimation of the load loss factor. This factor is essential to calculate the electrical energy losses in electrical power distribution networks. The represented approach can estimate the loss factor, especially for those distribution lines which their load profile has tedious to repetition and routine character like in industrial plants or for any other objects with similar load profile. A mathematical formulation of the problem has been developed and solved. The equivalent working hours (T (eq.)) are calculated based on a newly derived equation. The (T(eq.)) value leads to determine the amount of electrical energy losses in distribution lines. A numerical example and discussion have been presented to illustrate the significance of the proposed method.

Keywords: Load loss factor. Equivalent working hours. Electrical energy losses

Research Title: Solar Panels Cleaning Frequency for Maximum Financial Profit
Author: Mohammad Abu-Naser, Published Year: 2017
Open Journal of Energy Efficiency, 6
Faculty: Faculty of Engineering

Abstract: Allowing the dust to accumulate on solar panels without adequate cleaning leads to huge monetary losses. Proper judgment of when to call for washing of solar panels is a compromise between gross costs of cleaning the panels and how much reduction in efficiency of solar panels can be tolerated. In this paper, we derive a formula for the optimal number of days between cleaning cycles of a solar array by minimizing the cost of cleaning the array and the lost revenue from the unclean panels. The formula will aid in deciding cleaning periods based on the environment in which the solar panels are installed and cost incurred from undertaking the washing process.

Keywords: Dust Deposition, PV Efficiency Degradation, Optimal Cleaning Cycle