American Journal of Computer Engineering

  • CT Image Reconstruction Method Based on Filtered Back Projection Algorithm

    This paper used the relevant knowledge of electronic computer tomography image reconstruction to solve the problem of CT system parameter calibration and imaging algorithm. Through geometric analysis, a target optimization model was established. The parallel beam filtering back-projection algorithm was used to solve the problem based on the information received by the detector unit. The image reconstruction model was used to obtain the position information of the medium. Finally, image stability was verified by noise processing.


    The subject article is dedicated to the creation of test system for examination of students in a subject of computer science. The software testing users as well as the software on automation of creation of tests and the analysis of the tests handed over by the users are developed.

  • A Cloud-Linked Ambient Air Quality Monitoring Apparatus for Gaseous Pollutants

    Vehicles on the road are increasing in number and traffic conditions are getting worse exposing one to a plethora of diseases by going out on the traffic. People do not know the actual measure of the quality of the air they breathe outside on a regular basis, but it is of utmost importance to know of such in order to take precautionary measures. This study sought to make the quality of air known to the general public. Consequently, a microcontroller-centered device which could measure CO, NOx, and C6H6 concentrations in ambient air was developed along with a web application to display and visualize the data. The device uses a fan to sample air into an aluminum pipe containing metal oxide semiconductor gas sensors which detect and measure the gas concentrations in terms of mg/m3. An aluminum steel mesh is installed on the device’s inlet to filter out dust particles and is regularly cleaned by a vibration motor. The web application tabulates and plots data near-real-time whilst presenting the air quality index and a short-term exposure limit warning. Multiple devices can be deployed through registering in the web application. Two three-hour sampling data were gathered at dawn and in the morning along the University of San Carlos – Talamban Campus’ Portal which showed how the pollutant concentrations were low at dawn and which slowly grew higher during the transition to morning when road traffic began. Verification of the device’s readings was done through comparing its results with a private emission testing center’s exhaust gas analyzer. Air quality at the university’s portal was found to be in good condition during the monitoring periods.

  • A Dynamic Resource Mapping Load Balancing Technique in Cloud Computing

    Tremendous advantages of virtualization and cloud computing innovations have invigorated the Information and Communication Technology sector towards embracing cloud computing. Different ICT-empowered service providers additionally have either embraced cloud computing or began moving administrations to cloud framework. Be that as it may, the expanding interest for cloud based foundation has come about into extreme issue of managing the resources and load balancing for cloud specialist providers and customers. Specialists have recommended various different load balancing techniques for effective resource usage in cloud. An epic load balancing strategy speaking to migration of workload from over-loaded VM to daintily stacked VM in cloud computing condition is introduced in this paper. An endeavor is made to help the cloud partners to overcome the imbalanced resource usage issue is displayed in this paper.

  • Understand Congestion: It’s Effects on Modern Networks

    As Internet, can be considered as a Queue of packets, where transmitting nodes are constantly adding packets and some of them (receiving nodes) are removing packets from the queue. So, consider a situation where too many packets are present in this queue (or internet or a part of internet), such that constantly transmitting nodes are pouring packets at a higher rate than receiving nodes are removing them (Cardwell, Cheng, Gunn, Yeganeh, & Jacobson, 2016). This degrades the performance, and such a situation is termed as Congestion. Main reason for congestion in a network system is a greater number of packets into the network than it can handle. So, the objective of congestion control can be summarized as to maintain the number of packets in the network below the level at which performance falls off dramatically (Faisal Shahzad1, Ullah, Siddique, Khurram, & Saher, 2015). The nature of a Packet switching network can be summarized in following points: • A network of queues • At each node, there is a queue of packets for each outgoing channel • If packet arrival rate exceeds the packet transmission rate, the queue size grows without bound • When the line for which packets are, queuing becomes more than 80% utilized, the queue length grows alarmingly When the number of packets dumped into the network is within the carrying capacity, they all are delivered, expect a few that have to be rejected due to transmission errors). And then the number delivered is proportional to the number of packets sent (Evans & Filsfils, 2007). However, as traffic increases too far, the routers are no longer able to cope, and they begin to lose packets. This tends to make matter worse. At very high traffic, performance collapse completely, and almost no packet is delivered. Congestion is an important…

  • Enhancing Networks Lifetime Using Two-Step Uniform Clustering Algorithm (TSUC)

    Wireless sensor networks have enticed lot of spotlight from researchers all around globe, owing to its wide applications in industrial, military and agricultural fields. Energy conservation and node deployment strategies play a paramount role for effective execution of Wireless Sensor Networks. Clustering of nodes in the wireless sensor networks is an approach commenced to achieve energy efficiency in the network. Clustering algorithm, if not executed properly can reduce life of the network. In this paper, a Two -Step Uniform Clustering (TSUC) algorithm has been proposed with the aim to provide connectivity to the nodes in every part of the network. This algorithm increases networks lifetime and throughput by re-clustering isolated nodes rather than providing them connectivity by already connected node. Results obtained after simulation showed that proposed TSUC algorithm performed better than the other existing clustering algorithm.

  • Underwater Wireless Sensor Networks Challenges: A Review

    The underwater wireless sensor network consists of sensors that enable the exploration of natural undersea resources and gathering scientific data in collaborative monitoring missions. Underwater wireless sensor Network consists of variable number of floating and anchored sensors, sink and vehicles that are deployed over an area to be explored. Applications of underwater sensing range from oil industry to aquaculture, and include instrument monitoring, pollution control, climate recording, Prediction of natural disturbances, search and survey missions, and study of marine life. UWSN is a network of autonomous sensor nodes. Which are spatially distributed underwater to sense the water-related properties such as quality, temperature, and pressure? The sensed data can be utilized by variety of applications that can be used for the benefit of humans. The sensor nodes, stationary or mobile are connected wirelessly via communication modules to transfer various events of interest. In this paper, several fundamental key aspects of underwater acoustic communications are investigated. Different architectures for two-dimensional and three-dimensional underwater sensor networks are discussed, and the underwater channel is characterized. The main challenges for the development of efficient networking solutions posed by the underwater environment are detailed at all layers of the protocol stack. Furthermore, open research issues are discussed and possible solution approaches are outlined.

  • The Impact of OTT Services in Nigeria: Regulators, Operators and Customers Perspective

    Advancement in the field of Information Communication Technology (ICT) has led to creation of new technologies, one of such is Over-The-Top technology. This new technology offers low-cost delivery of digital information content and services which includes VoIP services, instant messaging services and so on to consumers. The Over-The-Top services do not have a network system of their own but instead rely on of telecommunication operator networks and other Internet Service providers for the delivery of their services, without any policy or lease agreement with these operators. This work focuses on considering the perspectives of the regulatory board, the telecommunication operators and the consumer has it relates to this technology. We also analyse the impact of the Over the Top technology has on the Nigerian economy also.