Parallel R-point implicit block method for solving higher order ordinary differential equations directly

Most of the existing methods for solving ordinary differential equations (ODEs) of higher order are sequential in nature. These methods approximate numerical solution at one point at a time and therefore do not fully exploit the capability of parallel computers. Hence, the development of parallel algorithms to suit these machines becomes essential. In this paper, a new method called parallel R-point implicit block method for solving higher order ODEs directly using constant step size is developed. This method calculates the numerical solution at more than one point simultaneously and is parallel in nature, thus suitable for parallel computation. Computational advantages are presented comparing the results obtained by the new method with that of conventional 1-point method. The numerical results show that the new method reduces the total number of steps and execution time. The accuracy of the parallel block and the conventional 1-point methods are comparable particularly when finer step sizes are used

Dynamic Voltage Restorer Application for Power Quality Improvement in Electrical Distribution System: An Overview

Dynamic Voltage Restorer (DVR) is a custom power device that is used to improve voltage disturbances in electrical distribution system. The components of the DVR consist of voltage source inverter (VSI), injection transformers, passive filters and energy storage. The main function of the DVR is used to inject three phase voltage in series and in synchronism with the grid voltages in order to compensate voltage disturbances. The Development of (DVR) has been proposed by many researchers. This paper presents a review of the researches on the DVR application for power quality Improvement in electrical distribution network. The types of DVR control strategies and its configuration has been discussed and may assist the researchers in this area to develop and proposed their new idea in order to build the prototype and controller

Voltage stability analysis of load buses in electric power system using adaptive neuro-fuzzy inference system (anfis) and probabilistic neural network (pnn)

This paper presents the application of neural networks for analysing voltage stability of load buses in electric power system. Voltage stability margin (VSM) and load power margin (LPM) are used as the indicators for analysing voltage stability. The neural networks used in this research are divided into two types. The first type is using the neural network to predict the values of VSM and LPM. Multilayer perceptron back propagation (MLPBP) neural network and adaptive neuro-fuzzy inference system (ANFIS) will be used. The second type is to classify the values of VSM and LPM using the probabilistic neural network (PNN). The IEEE 30-bus system has been chosen as the reference electrical power system. All of the neural network-based models used in this research is developed using MATLAB

Performance of Modification of a Three Phase Dynamic Voltage Restorer (DVR) for Voltage Quality Improvement in Electrical Distribution System

There is growing concern over power quality of ac supply systems. Power quality can be defined as the ability of utilities to provide electric power without interruption. Various power quality problems can be categorized as voltage sags, swells, harmonics, transients and unbalance are considered are the most common power quality problems in electrical distribution systems (Elandy etl., 2006). These types of disturbances can cause fails in the equipments, raising the possibility of an energy interruption.Voltage swells can be defined as a short duration increase in rms of main source with an increase in voltage ranging from 1.1 p.u up to 1.8 p.u. of nominal voltage source. There are various solutions to these problem

Social Commerce Among Micro and Small Medium Enterprises Before and During the COVID19: A Systematic Literature Review

Social commerce (SC) is a relatively new tool that businesses are using to conduct business using social media (SM). The findings of prior literature are inconclusive. This paper reviews the literature to identify the current status and to identify the determinant of SC. A systematic literature review was conducted. A total of 41 articles were reviewed. A comparison between before and during COVID19 was conducted. The findings showed the number of studies has not increased during COVID-19. The technology acceptance model (TAM) and Technology-Organization- Environment (TOE) are used widely in the literature. The most important factors identified in this study are divided into before COVID19 and during COVID19. Perceived usefulness and perceived ease of use were important in both periods. New variables that were considered important during COVID19 is the organizational readiness, trust, security, and E- word of mouth (EWOM). More research is needed to understand the factors that contribute to SC adoption in different nations. Variables such as trust, environmental uncertainty, and perceived value can be included in future work. Developing a digital ecosystem for SC is a direction for future work. Understanding the important factors can contribute to the advancement of SC

The Use of Presuppositions in the Short Story of Zilkê Şixatê (Matchstick)

This study explores the use of presuppositions in the Kurdish short story, Zilkê Şixatê (The Matchstick), which is written in Northern Kurmanji dialect (hence, NK) by Isma’il Hajani. It attempts to determine which type of presupposition is the most recurring one in the short story and why it is so. The data in this study are analyzed descriptively and qualitatively. Yule’s (2006) classification which divides presupposition into six types has been employed: existential, factive, non-factive, lexical, structural, and counterfactual. The data of the research are sentences which contain presupposition triggers (i.e. linguistic forms to mark presuppositions). Applying the formula presented by Oktoma and Mardiyono (2013: 79), the results obtained throughout this paper show that different types of presuppositions have different percentages from the total number of presuppositions. They are (94) in number. It is noted that the most dominant type of presupposition used in the short story is the existential presupposition, manifesting definite descriptions of facts about real life, while the structural presuppositions have the lowest percentage. This shows that much of the story text is written to definitely describe the main theme, the characters and the events as they are. Finally, this study is particularly important because no other such studies have been conducted on the use of presuppositions in any literary work in NK. Therefore, this study occupies a crucial place in the research literature into pragmatic aspects of NK

Triplen Harmonics Mitigation 3 Phase Four-Wire Electrical Distribution System Using Wye- Zig-Zag Transformers

This paper studies an application of wye- zigzag transformes for reducing harmonics in the neutral conductors of a three phase 415/240V distribution system. Triplen harmonic currents add up in the neutral conductor of the distribution system feeding the non linear loads such as personal computers and electronic office machines with switch mode power supplies. The zigzag transformer is installed between the distribution panel and the high harmonics producing loads. This research makes use of a star-zigzag grounded transformer

SPACE VECTOR ANALYSIS IN ELECTRICAL DRIVES FOR SINGLE-PHASE INDUCTION MOTOR USING MATLAB/SIMULINK

Space Vector Pulse Width Modulation (SVPWM) has become the successful techniques to construct threephase sine wave Voltage Source Inverter (VSI) parallel to control three-phase motor using vector control. In this paper we present the analysis of SVPWM to construct two-phase sine wave VSI for single-phase induction motor. We also describes the modulation technique refer to dq components of main and auxiliary windings of single-phase induction motor. The VSI have four legs for this single-phase induction motor, and the four switching sequences had simulated in MATLAB and SIMULINK. The simulation result shows the feasibility of the proposed modulation techniques to drive single-phase induction motor

Rangkaian Neural Genetik Aplikasi dalam Pengecaman Aksara Jawi

Objektif asas bagi Algoritma Genetik (atau ringkasnya AG) ialah melihat proses evolusi asli dalam bentuk satu versi perisian. Ia sering digunakan untuk masalah pengoptimuman. Dalam proses ini suatu populasi boleh berkembang biak, ditot atau diklon, dan mati dalam beberapa saat. Perubahan ini berlaku secara berterusan. Kini, AG telah dikembangkan konsepnya ke dalam Rangkaian Neural (atau ringkasnya RN). Kertas ini membicarakan konsep atau proses evolusi yang digunakan didalam R

Islamic banking: an exploratory study of public perception in Uganda

Purpose – Islamic banking (IB) has been globally embraced by over 76 countries, with over $2tn in assets. Despite this remarkable progress, there are countries that are yet to fully embrace IB (Uganda inclusive). All the ongoing initiatives in Uganda (at policy level) to establish IB require supporting study of public awareness and attitudes toward IB. This will stimulate a down-top approach to the feasibility of IB and policymaking, thus providing a fertile ground for wider consideration of the majority stakeholders’ views in formulating standards and policy guidelines regulating IB. This study aims to explore the perception of Ugandans towards IB. Design/methodology/approach – The study is exploratory in nature and uses a quantitative method. Out of the 400 questionnaires distributed, only 354 were usable for further analysis. SPSS 21 was used to analyze data using descriptive statistics and factor analysis. Findings – Major findings indicate that unlike non-Muslims, Muslims are more knowledgeable about the IB culture, although both groups have low awareness about IB terminologies. There were inconsistences in Muslim and non-Muslim attitudes toward IB, for instance; while non-Muslims are motivated by “profitability”, Muslims’ inclination to IB is mainly due to “religious and profitability combined”. Both groups demonstrated some uniformity in their selection criteria of banks such as “third party influence”, although they are inconsistent in other factors. Originality/value – The novelty of this study rests in its down-top approach to feasibility of IB by gauging the perception of majority stakeholders before IB is established. The study is conducted in a heterogeneous society unlike many of similar studies that have focused on Muslim majority countries. As most studies (with similar background) are at least 18 years old, this study remains outstanding in gauging the dynamics of stakeholders in Muslim minority countries which have yet established IB