American Journal of Computer Sciences and Applications

Modeling a Fault Tolerant Control Mechanism for Cloud e-marketplaces using Raft Consensus Protocol (RCP)

Research article of American Journal of Computer Sciences and Applications Modeling a Fault Tolerant Control Mechanism for Cloud e-marketplaces using Raft Consensus Protocol (RCP) Ige A.O.a, Akingbesote A.O.a, Oriola O.a, and Aranuwa F.O.a aComputer Science Department, Adekunle Ajasin University, Akungba – Akoko, Ondo State, Nigeria The evolution of marketplaces started from the traditional marketplace, the internet marketplace, the web service marketplace, the grid marketplace, before moving to cloud e-marketplace. The need to have rapid access to various service by different customers brought about cloud e-marketplaces. The goal of the cloud e-marketplace is to attract the biggest possible number of buyers while ensuring a reduced waiting time for customers and maximized profit for cloud service providers. Challenges like security, performance and fault tolerance are of great concern in the cloud market. While discussion on the issue of security and performance are ongoing, that of fault tolerance is yet to be fully addressed. Although some researchers have proposed the use of multiple servers in achieving the main idea of the cloud e-marketplace, different kinds of faults still affects the performance of cloud e-market. Balancing of providers’ cost and customers’ waiting time is still a major concern. Various techniques have been proposed in solving these problems. However, these techniques only work in a static environment where these servers can be faulty which may lead to long waiting time. We propose the use of Raft consensus protocol as our fault tolerant approach. We use the dynamic environment as against the already static approached already discussed in the literature. In the dynamic environment, two fault tolerant centers that are capable of surviving failure caused by server overload or congestion are used. These are primary and the reservoir centers. The Raft Consensus Protocol is used in both centers to coordinate the servers and make sure that each ...

Postal Service Tracking System

Research article of American Journal of Computer Sciences and Applications Postal Service Tracking System Yaknan John Gamb1*, Gbor I. Jacob2, Mu’awuya Dalhat1, Sani Aliyu Ahmad1 1Department of Computer Science, Federal University Wukari, Wukari, Taraba State, Nigeria. 2DepartmentMathematics, Statistics and Computer Science, Kwararafa University Wukari, Wukari, Taraba State, Nigeria. This research presents a web-based Postal Service Tracking System for an efficient and effective Postal Service Delivery. The software will help keep track of freight or parcel as they are being delivered from one place to the other. Most times the delivery of packages involves transporting them across long distances with several stops that may lead to the mix-up or possible misplacement of the packages enroute. The advent of Barcode or Quick Response (QR) has greatly assisted these efforts, to track mail from the time it arrives in the mail room to the time it is delivered to its intended location for pickup or delivery. In this research a Barcodes and QR identification techniques were used in the system to help identify and track packages. The system was implemented using Bootstrap for the front end, PHP for the business logic and MYSQL for the backend on an Apache server. Keywords: Post, Postal, Postal Service, Tracking System, QR Code, Barcode ...

Unified transportation authenticated reservation system using online QR-code

Research article of American Journal of Computer Sciences and Applications Unified transportation authenticated reservation system using online QR-code Hussam Elbehiery1, and Ghada Abdelhady2 1Ahram Canadian University (ACU), 2October University for Modern Sciences and Arts (MSA) Public transit whether it is buses, trains, or metros can be particularly frustrating for passengers. Although public transit is typically cheaper and more green than traveling by a private vehicle, public transit may not be as comfortable, convenient, or as quick as a private vehicle, passengers will have to plan their schedules around the public transit timetables, and unforeseen circumstances may disrupt public transit operations. However, the drawbacks of public transportation is slowly being eliminated; public transit is starting to become more comfortable, districts are offering more amenities for passengers such as internet access, and districts are starting to improve service by offering more trips and express service. Designing a computerized system has been introduced in this research which is based on the Internet to remotely reserve all types of tickets for the most important and essential types of transportation in Egypt. The covered transportation types in the suggested system should be trusted like private Buses companies like GO Bus, Blue eyes, West Delta, and East Delta, Underground Metro, and Railway Trains network. By generating QR-Code which will be sent to the customer on his own mail using any connected device to Internet including all details of the ticket. Whenever the customer reserves the ticket, he can deal with in a hard copy or electronic version. The suggested reservation system depends on using the databases of National IDs and Visa Card. So, it will be very easy and helpful systems which will leads to save time and money too, and in future it will minimize dealing with the tickets’ window in stations. Keywords: Message Digest, QR-code, ...

Performance Evaluation of SC-FDMA Systems Using Wireless Images

Research article of American Journal of Computer Sciences and Applications Performance Evaluation of SC-FDMA Systems Using Wireless Images K. M. Al-soufy, F. S. Al-kamali and F. A. Al-fuhaidy Department of Electrical, Faculty of Engineering and Architecture, Ibb University, Ibb, Yemen Recently, single crarrier frequency division multiple access (SC-FDMA) has drawn great attention in wireless communications due to its low peak-to-average power ratio and low sensitivity to carrier frequency offsets. The aim of this paper is to investigate and test the wireless image transmission over SC-FDMA with consideration of different basis functions, different modulation schemes and different subcarriers mapping schemes. Several experiments are carried out and the obtained results show that the wireless images transmission over SC-FDMA systems is possible efficiently. Simulation results also show that the interleaved systems significantly improve the clarity of the received image and their performances are better than that of the localized systems irrespective of the wireless channel or the modulation scheme used. Moreover, the results show that the discrete cosine transform (DCT)-based SC-FDMA (DCT-SC-FDMA) and discrete sine transform (DST)-based SC-FDMA (DST-SC-FDMA) system achieve better performance than the conventional discrete Fourier transform (DFT)-based SC-FDMA (DFT-SC-FDMA) system in terms of Mean Square Error (MSE) and Peak Signal-to-Noise Ratio (PSNR) values. Keywords: Image transmission, DFT-SC-FDMA, DCT-SC-FDMA, DST-SC-FDMA, QPSK and 16QAM ...

Dr. Christo Ananth
Associate Professor, Electronics & Communication Engineering, Francis Xavier, Engineering College.

Dr. Debabrata Samanta
Associate professor, Dept. of Computer Applications,, Dayananda Sagar College of Arts, Science and Commerce, Bangalore, India.

Muhammad Zainuddin Lubis
Department of Informatics Engineering,Politeknik Negeri Batam

Dr. S. Sathish
Assistant Professor and Head, Dept. of Automobile Engineering, Vels University, Pallavaram, Chennai

Dr. Vaibhav Sundriyal
Research Scientist, Old Dominion University research Foundation, USA

Associate Professor, Duzce University Technology Faculty Computer Engineering Department

Dr. M. Ramesh Kumar
Associate Professor/Project Coordinator, Department of Computer Science and Engineering, VSB College of Engineering Technical Campus, Coimbatore, Tamilnadu, India

Dr. S. Krishna Murthy
Associate Professor, Department of Applied Mathematics, Defence Institute of Advanced Technology, Deemed University(DU), Girinagar, Pune

Dr. S. Arivoli
Assistant Professor/EEE, VSB College of Engineering Technical Campus, Coimbatore-642109

Dr. Mustafa SEVINDIK
Institute of Science and Technology, Akdeniz University

Dr. Yashar Hashemi
Coding and Diagram Expert, Tehran Regional Dispatching, Tehran Regional Electric

Dr. Pushpraj Pal
Assistant Professor, SRM IET Ambala

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1.Hussam Elbehiery and Ghada Abdelhady. Unified transportation authenticated reservation system using online QR-code. American Journal of Computer Sciences and Applications, 2018; 2:12. DOI: 10.28933/ajcsa-2018-08-0201. 
2. K. M. Al-soufy, F. S. Al-kamali and F. A. Al-fuhaidy. Performance Evaluation of SC-FDMA Systems Using Wireless Images. American Journal of Computer Sciences and Applications, 2017; 1:11. DOI: 10.28933/ajcsa-2017-11-1801 

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American Journal of Computer Sciences and Applications