International Journal of Computer (IJC) <p>The <a title="International Journal of Computer (IJC) home page" href="/index.php/InternationalJournalOfComputer/index" target="_blank" rel="noopener"><strong>International Journal of Computer (IJC)</strong></a> is an open access International Journal for scientists and researchers to publish their scientific papers in Computer Science related fields. <a title="International Journal of Computer (IJC)" href="/index.php/InternationalJournalOfComputer/index" target="_blank" rel="noopener">IJC</a> plays its role as a refereed international journal to publish research results conducted by researchers.</p> <p>This journal accepts scientific papers for publication after passing the journal's double&nbsp;peer review process.&nbsp; For detailed information about the journal kindly check <a title="About the Journal" href="/index.php/InternationalJournalOfComputer/about">About the Journal</a>&nbsp;page.&nbsp;</p> <p>All <a title="International Journal of Computer (IJC)" href="/index.php/InternationalJournalOfComputer/index" target="_blank" rel="noopener">IJC</a> published papers in Computer Science will be available for scientific readers for free; no fees are required to download published papers in this international journal.</p> <p>&nbsp;</p> International Journal of Computer en-US International Journal of Computer (IJC) 2307-4523 <p style="text-align: justify;">Authors who submit papers&nbsp;with this journal agree to the following terms:</p> <ol start="1"> <li class="show" style="text-align: justify;">Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a&nbsp;<a href="" target="_new">Creative Commons Attribution License</a>&nbsp;that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.</li> <li class="show" style="text-align: justify;">Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.</li> <li class="show" style="text-align: justify;">Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See&nbsp;<a href="" target="_new">The Effect of Open Access</a>).</li> <li class="show" style="text-align: justify;">By submitting the processing fee, it is understood that the author has agreed to our terms and conditions which may change from time to time without any notice.</li> <li class="show" style="text-align: justify;">It should be clear for authors that the Editor In Chief is responsible for the final decision about the submitted papers; have the right to accept\reject any paper. &nbsp;The Editor In Chief will choose any option from the following to review the submitted papers:A. send the paper to two reviewers, if the results were negative by one reviewer and positive by the other one; then the editor may send the paper for third reviewer or he take immediately the final decision by accepting\rejecting the paper. The Editor In Chief will ask the selected reviewers to present the results within 7 working days, if they were unable to complete the review within the agreed period then the editor have the right to resend the papers for new reviewers using the same procedure. If the Editor In Chief was not able to find suitable reviewers for certain papers then he have the right to reject the paper.</li> <li class="show" style="text-align: justify;">Author will take the responsibility what so ever if any copyright infringement or any other violation of any law is done by publishing the research work by the author</li> <li class="show" style="text-align: justify;">Before publishing, author must check whether this journal is accepted by his employer, or any authority he intends to submit his research work. we will not be responsible in this matter.</li> <li class="show" style="text-align: justify;">If at any time, due to any legal reason, if the journal stops accepting manuscripts or could not publish already accepted manuscripts, we will have the right to cancel all or any one of the manuscripts without any compensation or returning back any kind of processing cost.</li> <li class="show" style="text-align: justify;">The cost covered in the publication fees is only for online publication of a single manuscript.</li> </ol> Presence Detection with Bluetooth Low Energy: A Review and Experiment <p>Bluetooth is one of the most ubiquitous technologies in smart phone today and its prominence in other devices is rising rapidly. It has become the De Facto technology used when there is need for device-to-device communication. However, the evolving standard has much more to offer. Bluetooth can power many applications due to capabilities. A key metric of Bluetooth is the Received Signal Strength Indicator (RSSI) and depending on the readings one can infer locality. This study evaluates existing research that attempts localization implemented using the Bluetooth protocol and the metrics that power those applications. A proof-of-concept software is developed to further investigate the feasibility of presence detection using Bluetooth Low Energy without connection to a device.&nbsp;</p> Michael Hosein Kevin Jaglal Copyright (c) 2021 International Journal of Computer (IJC) 2021-01-29 2021-01-29 40 1 1 13 Elaboration of Processing Chains for Spatio-temporal Analysis of Rainfall Data Application: Alaotra Mangoro Region, Madagascar <p>This present study was carried out within the framework of the automation of the processing chains of spatio-temporal data processing of climatological data in Madagascar. Our objective is to develop and automate the processing chains of rainfall data from ERA-Interim re-analyses of the European Meteorological Centre ECMWF to observe and analyze the evolution of precipitation over time and space. The chains are elaborated in a generic way by introducing statistical methods such as spatial interpolation, calculation of temporal and spatial averages, maximum entropy method, and principal component analysis. Then, the elaborated chains are implemented with MATLAB. Thus, the test of these chains has been performed in the Alaotra Mangoro region. The results obtained allowed us to observe, analyze and interpret the evolution of precipitation in this region of Madagascar during 35 years (1979 to 2013).</p> Aimé Richard Hajalalaina Arisetra Razafinimaro Niry Arinavalona Rakotovao Adolphe Ratiarison Copyright (c) 2021 International Journal of Computer (IJC) 2021-02-23 2021-02-23 40 1 14 35 Design of a MPPT System Based on Modified Grey Wolf Optimization Algorithm in Photovoltaic System under Partially Shaded Condition <p>Conventional Maximum Potential Monitoring strategies such as perturbation and observation, incremental conduct, and climbing can effectively monitor the maximum power point in uniform shading, whereas failing in a partially shaded condition. Nevertheless, it is difficult to achieve optimal and reliable power by using photovoltaics. So, to solve this issue, this article proposes to monitor the photovoltaic system's global optimum powerpoint for partial shading with a Modified Gray Wolf Optimizer (MGWO) based maximum power point tracking algorithm. Under partial shadows, a mathematical model of the PV system is built with a single diode, EGWO is used to monitor global maximum power points.&nbsp; A photovoltaic system includes deciding which converter is used to increase photovoltaic power generation. The MPPT architecture uses a modified gray wolf optimization algorithm to quickly track the output power and reduce photovoltaic oscillations. The efficiency of the maximum power tracker is better than the GWO algorithm of up to 0,4 s with the modified gray wolf optimization algorithm. Converters are used to resolve the power losses often occurring in PV systems with a soft-buck converter process.&nbsp; The output of the power generator is greater than the soft-switching buck converter. The simulation and experimental results obtained suggest that both the P &amp; O and IPSO MPPTs are superior to the proposed MPPT algorithm, the proposed algorithm increases the traceability efficiency. The suggested algorithm has the fastest follow-up speed since the α value decreases during the iteration exponentially.</p> Muhammad Ilyas Hatem Khalifa Emhmed Ghazal Copyright (c) 2021 International Journal of Computer (IJC) 2021-03-01 2021-03-01 40 1 36 49 Marigold Blooming Maturity Levels Classification Using Machine Learning Algorithms <p>Image processing is swiftly progressive in the area of computer science and engineering. Image classification is a fascinating task in image processing. In this study, we have classified the marigold blooming maturity levels like a marigold bud, partial blooming marigold, and fully blooming marigold. To classify the marigold blooming maturity levels are a tough and time-consuming task for human beings. Hence, an automatic marigold maturity levels classification tool is very adjuvant even for experience humans to classify the huge number of marigolds. For the sake of that, we have deliberated a novel system to classify automatically marigold blooming maturity levels image data by using machine learning algorithms. There are three types of machine learning models namely Artificial Neural Network(ANN), Convolutional Neural Network(CNN), and Support Vector Machine(SVM) that are used to automatically classify marigold maturity levels. Hence, we have preprocessed the image at first. Then we extract the various features from the marigold images. After that, these features have fed into Machine Learning(ML) models and classify these images into the category. From the experiment, we observed that the Convolutional Neural Network (CNN) model provides a high accuracy compared to other Artificial Neural Network(ANN) and Support Vector Machine(SVM) algorithms. The Convolutional Neural Network(CNN) models performed the best among all two classifiers with an overall accuracy of 93.9%. Our proposed system is efficiently classifying marigold maturity levels.</p> S M Abdullah Al Shuaeb Shamsul Alam Mohammod Hazrat Ali Md. Kamruzzaman Copyright (c) 2021 International Journal of Computer (IJC) 2021-03-06 2021-03-06 40 1 50 65 Design of a Digital Game-Based Learning Environment for Solving Quadratic Equations Using Completing-the-Square-Method <p>Various preconceptions about the effectiveness of applying digital-games approach in tandem with traditional teaching methods subsist in spite of learners increasing usage of digital devices and digital games. This trend obviously underplays the existing technological advancements made in respect to digital devices and computer game programming. This research paper applied the digital game approach to the teaching of mathematics with a view to boosting learner’s interest while mitigating boredom, difficulty and apprehension towards solving problems. It employed story-telling technique and role-play (both fun elements) to mathematics learning while still preserving the traditional stepwise approach to problem-solving in mathematics. A digital game-based environment was developed based on the battleship game. This environment was used to learn how to solve the quadratic equation using completing the square method. Performance evaluation was carried out to determine if the system aligns with the underlined objectives. The findings showed that using the digital game-based learning system helps in reducing learners’ apprehension in solving the quadratic problem and improved their cognitive skills in solving quadratic equations.</p> Oluwatoyin Catherine Agbonifo Akintoba Emmanuel Akinwonmi Mosope Samuel Williamson Copyright (c) 2021 International Journal of Computer (IJC) 2021-04-10 2021-04-10 40 1 66 82