Computer Reviews Journal <p><em>Computer Reviews</em> is scientific, international peer-reviewed/Referred online journal that is devoted to fields of&nbsp;computing to provide rapid publication of articles frequently in its issues.</p> PURKH en-US Computer Reviews Journal 2581-6640 Development and Evaluation of an Environmental Awareness Android Game <p>The main purpose of this project is to create a game application that will help raise awareness about the environment and environmental issues. The proponents came up with this idea to give players the knowledge of what will happen to the environment if it is taken for granted by humans. PARABUKAS has eight (8) mini-games and some animation videos that the players will enjoy and at the same time, gain knowledgeable information with the trivias/facts that will be provided in the game. PARABUKAS is an offline game and is downloadable online via Google’s Play store. The game was divided into two categories namely, the Quick Game in which the player could choose which of the mini-games to play and the Classic Game which is the normal flow of the game where the mini-games are played randomly. The evaluation instrument used was the user’s Evaluation Sheet for Game Design/Animated Video with the criteria of Game Design, Game Script, Graphic Arts, Music and Sound, Quality, Intellectual Component, and Compliance with Project Objectives. The overall mean was interpreted as “Excellent”. The evaluation result shows that the game application is a tool for learning and increasing awareness.</p> Rosslin John Robles Cyril Evan Jalagpas Sr. Clarita Dael Jhenie Porras Joy Christine Yucom Josephine De Asis Joevic Pecate Maricel Balitanas- Salazar Gerard Sayomac Daisy Endencio- Robles Copyright (c) 2020 Rosslin John Robles, Cyril Evan Jalagpas, Sr. Clarita Dael, Jhenie Porras, Joy Christine Yucom, Josephine De Asis, Joevic Pecate, Maricel Balitanas- Salazar, Gerard Sayomac, Daisy Endencio- Robles 2020-04-30 2020-04-30 6 1 10 The Application of Logical Operations and Tabular Transformations in the Base Accents of Hash-Function Algorithms <p>In the article the stages of transformation of the hashing processes on the structure of the general functional model of the algorithm without the key hash function are defined. The foundations of the application of logical operations and table replacements with the construction of models of basic transformations of the algorithm are revealed. The basics of methods and methods for modeling basic transformations have been developed. Their fundamental applications for creation with new transformations without key hash function algorithms are substantiated.</p> Shukhratjon Azizjonovich Umarov Copyright (c) 2020 Shukhratjon Azizjonovich Umarov 2020-04-30 2020-04-30 6 11 18 Context-Aware System for Indoor Localization <p>User location is an important information to provide personalized service in any domain of interest. In this paper, we present a context-aware system to find location of a user at office domain. Hence, smartphone of the user transmits Wi-Fi signal and our system identifies the user by matching MAC address of the smartphone. Wi-Fi signal strength is used to calculate the distance of user from office room. Additionally, PIR sensor value and office time are used to increase localization accuracy as well as minimize the conflict of user location. Raspberry pi 3, a low-cost embedded platform, is used to collect and process sensed information, generate low-level context, and reason user location from available contexts. Demonstration result of our system shows an excellent performance within our domain of interest.</p> M. Robiul Hoque Shomako Bosu Md. Aktaruzzaman M. Humayun Kab Copyright (c) 2020 M. Robiul Hoque, Shomako Bosu, Md. Aktaruzzaman, M. Humayun Kab 2020-04-30 2020-04-30 6 19 27 Stationary Multivariate Probabilities Estimation for Intelligent MCMC Algorithms <p>The purpose of this paper is to get theoretical and empirical results for stationary multivariate probabilities estimation of any clonal selection or genetic algorithm by new presented proposed algorithm. The estimation proposed formula is true for any regular Markov Chain to get the desirable multivariate distribution. &nbsp;&nbsp;&nbsp;&nbsp;</p> <p>&nbsp;</p> Usama Hanafy Abou El-Enien Copyright (c) 2020 Usama Hanafy Abou El-Enien 2020-04-30 2020-04-30 6 28 30 Estimation of First Passage Time Probabilities at Second Transition respecting Evolutionary MCMC Algorithms <p>With regard to genetic algorithms with bit mutation, the target is to offer novel algorithm to obtain experiential and theoretic results for first passage time probabilities estimation at second transition. The estimating proposed formula is true with regard to any regular Markov Chain.&nbsp;&nbsp;&nbsp;</p> Usama Hanafy Abou El-Enien Copyright (c) 2020 Usama Hanafy Abou El-Enien 2020-04-30 2020-04-30 6 31 33 Control Circuit Design of 7-Segment Common Cathode LED Display GPS Receiver Clock and Arduino Program <p>This paper newly designs the control circuit of the 7-segment common cathode LED display global positioning system (GPS) receiver clock and presents an Arduino sample program. The computer numerical control (CNC) router engraves the copper foil substrate to manufacture the printed wiring boards (PWBs) of the 7-segment common cathode LED display and its control circuits according to each G-code produced by the printed circuit board (PCB) design software Target3001! For each segment of the 7-segment common cathode LED display circuit, the two LEDs are connected in series. From an experiment, the two N-Channel metal-oxide-semiconductor field-effect transistors (MOSFETs) EKI04047, one at the high side and the other at the low side around the two LEDs, do not light on the two LEDs connected in series at all, unlike the case of the two LEDs connected in parallel. For this reason, upon lighting on/off the LEDs, this paper, newly, proposes the switching on/off control circuit with the optical relays at the high and low sides around the two LEDs connected in series.</p> Seiichi Nakamori Copyright (c) 2020 Seiichi Nakamori 2020-04-30 2020-04-30 6 34 46 Multi -Layer Based Data Aggregation Algorithm for Convergence Platform of IoT and Cloud Computing <p>Sensor Networks (SN) are deployed in smart domain to sense the environment which is essential to provide the services according to the users need. Hundreds or sometimes thousands of sensors are involved in sensor networks for monitoring the target phenomenon. Large scale of sensory data have to be handle by the sensor network which create several problems such as waste of sensors energy, data redundancy. To overcome these deficiencies one most practice solution is data aggregation which can effectively decrease the massive amount of data generated in SNs by lessening occurrence in the sensing data. The aim of this method is to lessen the massive use of data generated by surrounding nodes, thus saving network energy and providing valuable information for the end user. The effectiveness of any data aggregation technique is largely dependent on topology of the network. Among the various network topologies clustering is preferred as it provides better controllability, scalability and network maintenance phenomenon. In this research, a data aggregation technique is proposed based on Periodic Sensor Network (PSN) which achieved aggregation of data at two layers: the sensor nodes layer and the cluster head layer. In sensor node layer set similarity function is used for checking the redundant data for each sensor node whereas Euclidean distance function is utilized in cluster head layer for discarding the redundancy of data between different sensor nodes. This aggregation technique is implemented in smart home where sensor network is deployed to capture environment related information (temperature, moisture, light, H2 level). Collected information is analyzed using ThinkSpeak cloud platform. For performance evaluation amount of aggregated data, number of pairs of redundant data, energy consumption, data latency, and data accuracy are analyzed and compared with the other state-of-art techniques. The result shows the important improvement of the performance of sensor networks.</p> M Humayun Kabir M. Mamun-Ibn-Abdullah M. Ali Copyright (c) 2020 M Humayun Kabir, M. Mamun-Ibn-Abdullah, M. Ali 2020-04-30 2020-04-30 6 47 55