Gajendra Sharma , Ankita Yadav (2018). Fault Tolerance in Real Time Distributed System. Review of Computer Engineering Research, 5(2): 20-24. DOI: 10.18488/journal.76.2018.52.20.24
Fault tolerance is in the center of distributed system design that covers various methodologies. This research paper aims to investigate different types and techniques of fault tolerance which are being used in many real time distributed systems. The fault can be detected and recovered by many techniques. Moreover, an appropriate fault detector can avoid loss due to system crash or any kind of failure in system. This paper provides a framework for detecting fault in real time system which is supposed to be handled and processed further by the help of coordinator.
This study contributes in the existing literature of fault tolerance in time distributed systems.
A Survey on Efficient Power Management Using Smart Socket and IoT
B.Santhosh Kumar , R. Cristin (2018). A Survey on Efficient Power Management Using Smart Socket and IoT. Review of Computer Engineering Research, 5(2): 25-30. DOI: 10.18488/journal.76.2018.52.25.30
Energy Saving is visualized to be one of the key components driving vitality uses in electronic gadgets. In spite of the fact that there are various methods and standards used to moderate vitality, there is no prescribed answer for any of the issues overseeing wastage of electrical vitality. These wastages might be because of obliviousness, indiscretion and a few different variables. Instead of utilizing a sensor organizes, keen attachment is utilized as a part of the request to decrease the vitality devoured while watching those associated gadgets. These attachments are equipped for estimating the present going through them and transmit with each other by means of the Zigbee organize inside the home portal and exchange the information bundles in like manner. These vitality utilization subtle elements are the associated with the server through a web association. Here, the attachments are arranged such that it covers the whole ecological space and are assigned with urgencies in light of client's way of life, time of the task, day of activity and the aggregate vitality that is accessible. Consequently, there is better checking of energy devoured without squandering critical vitality in observing.
This study contributes in the existing literature on efficient power management using smart socket and IoT. It refers to the use of intelligently connected device and systems to gather large amount of data. It is envisioned as an era in which objects can automatically and intelligently serve people in a collaborative manner.
Development of Facilitated Participatory Spatial Information System for Selected Urban Management Services
Ozuomba, Simeon , Kalu, Constance , Akpasam Joseph Ekanem (2018). Development of Facilitated Participatory Spatial Information System for Selected Urban Management Services. Review of Computer Engineering Research, 5(2): 31-48. DOI: 10.18488/journal.76.2018.52.31.48
In this paper, the development of a web based spatial information system for selected urban management services in Akwa Ibom state is presented. The selected urban management services include; disaster management, waste management, land administration and land transportation information hub. Participatory evolutionary software development methodology was used in the system development and the system was implemented using Hyper Text Markup Language (HTML) for the web interface, PHP Hypertext preprocessor (PHP) for the server side scripting , MySQL for the database, Google map API (Application Programming Interface) for the maps and Apache as the web server. The web application was hosted locally using WAMP server and tested with some dataset obtained in the case study area. Relevant screenshots of the webpages are also presented. The web application presented in this paper can be used to facilitate participatory urban service in any given city or state.
This study originates requisite flowcharts and accompanying web applications for online management of selected urban services. Notably, the software designs are based on the prevailing technical and socioeconomic conditions in the case study area (Akwa Ibom State Nigeria).
Extended Stanford University Interim Model Loss Stanford University Interim Propagation Loss Model for a Gmelina Arborea Tree-Lined Road
Umana, Sylvester. Isreal , Nnamonso O. Akpbio , Samuel Etaruwak Mbong (2018). Extended Stanford University Interim Model Loss Stanford University Interim Propagation Loss Model for a Gmelina Arborea Tree-Lined Road. Review of Computer Engineering Research, 5(2): 57-63. DOI: 10.18488/journal.76.2018.52.57.63
In this paper, the extended Stanford University Interim (ESUI) path loss model was evaluated and optimized based on empirically measured path loss obtained along a suburban road lined with Gmelina Arborea trees. The study was for a 1800 MHz cellular network located in Orlu Imo state. The field measurement was conducted in August which is in the rainy season with the entire trees blossom with their green leaves. G-NetTrack Lite 8.0 Adroid app installed on a Samsung Galaxy S8 mobile phone was then used to capture and log the received signal strength (RSSI) in dB, the geo-coordinates of the measurement points as well as the particulars of the 3G network base station. Two datasets were captured and one f the dataset was used for the model optimization while the other dataset was used for validation of the model. For the training dataset, un-tuned ESUI model had a root mean square error (RMSE) of 46.82 dB and maximum absolute prediction error of 46.64 dB whereas the RMSE-tuned ESUI model had a RMSE of 4.094dB and maximum absolute prediction error of 3.41dB. Similarly, for the validation dataset, the un-tuned ESUI model had a RMSE of 48.37dB and maximum absolute prediction error of 48.19 dB whereas the RMSE-tuned ESUI model had a RMSE of 4.39 dB and maximum absolute prediction error of 3.0 dB. In all, the tuned ESUI model was derived and it gave good path loss prediction performance for both the training and the validation datasets.
The paper's primary contribution is the derivation of a root mean square error-based optimized extended Stanford University Interim (ESUI) path loss model for a suburban road lined with Gmelina Arborea trees.
Characterisation of Propagation Loss for a 3G Cellular Network in a Crowded Market Area Using CCIR Model
Simeon Ozuomba , Enyenihi, Johnson , Ngwu Chinyere Rosemary (2018). Characterisation of Propagation Loss for a 3G Cellular Network in a Crowded Market Area Using CCIR Model. Review of Computer Engineering Research, 5(2): 49-56. DOI: 10.18488/journal.76.2018.52.49.56
In this paper, the propagation loss for 1800 MHz cellular network in a crowded market is studied and characterized using the Comit´e International des Radio-Communication, (CCIR) propagation loss model. Empirical measurement of the received signal strength in the market was conducted using CellMapper android app installed on Samsung Galaxy S4 phone. The CCIR model was configured with three different percentages of covered areas (PB). The model was optimized using the root means square error (RMSE) method and also by tuning the PB value. The un-tuned CCIR model gave an RMSE value of 9.23 dB which is above the acceptable upper limit of 6 dB for propagation loss prediction models. On the other hand, the PB-tuned CCIR model gave the best prediction result with an RMSE value of 2.177 dB and prediction accuracy of 98.11 % which is better than the performance of all the RMSE-tuned CCIR models. The results showed that apart from using an RMSE value to tune the CCIR propagation loss model, adjustment of some other key parameters of the model can as well provide a better prediction performance. However, the choice of the parameter to be tuned depends on the specific nature of the case study area.
The paper's primary contribution is the development of an alternative approach for optimizing the CCIR model by adjusting the percentage of covered area rather than using the root mean square error (RMSE). The paper demonstrated that the proposed method can give better propagation prediction performance than the RMSE-based optimization approach.
Development of Web Application for University of Uyo Post UTME Examination Timetable
Enyenihi, Henry Johnson , Ngwu Chinyere Rosemary , Eduediuyai, Dan (2018). Development of Web Application for University of Uyo Post UTME Examination Timetable. Review of Computer Engineering Research, 5(2): 64-73. DOI: 10.18488/journal.76.2018.52.64.73
In this paper a web application for Post Unified Tertiary Matriculation Examination (Post UTME) timetable for University of Uyo (UNIUYO) was presented. The system includes a web-based mapping system for visualizing the Post UTME examination venues on a Google base map. The system interfaces with the Google map server using a comma separated version interface file that contains the spatial data of the items to be visualized on the Google base map. An evolutionary software development model was used in the development of the web application. The system was implementation using Macromedia Dreamweaver, Cascaded Style Sheet (CSS), MYSQL Database Management System, HTML language, PHP server-side scripting language, Apache web server and Google Maps application programming interface. The application was hosted locally and sample Post UTME examination timetable data from UNIUYO were used to demonstrate the effectiveness of the Post UTME timetable web application.
This study is one of very few studies which have developed a map mashup timetable web application for the Post Unified Tertiary Matriculation Examination (Post UTME). The web application uses Google base map to visualize the Post UTME timetable venues on a map and also gives direction for the users.