Modelling, simulation and optimisation of a pressure retarded osmosis power station: The co- vs. counter-current setting
July 2024
In a pressure retarded osmosis (PRO) power plant, osmosis is used to generate electric power in a 2-channel system through a semipermeable membrane. Such system can be operated in the co- or in the counter-current mode, depending on relative flow direction of the fresh and the salt (draw) water along the membrane. In order to study and compare these two cases, models which describe the variations of the various...
Lessons learned and perspectives on constrained data collection and preparation for a predictive machine learning model applied to transportation industry in a non-digitalised environment
March 2024
Machine learning algorithms are based on qualitative and quantitative historical data, to create predictive models for shape recognition, autonomous systems, etc., using classifiers like K-Nearest Neighbors (KNN), neural-network, etc. So, treatment of data is the undisputed fuel that powers any machine learning endeavour. A standard data collection methodology would comprise a few steps as data collection, cleaning,...
A practical guideline for implementing an extra security layer on an intra-cloud private MongoDB Database using encryption
March 2024
Cloud computing offers different deployment and distribution models for the outsourcing of the company’s Information Technology (IT) infrastructure (applications and data). The wide adoption of this concept does not exclude permanent and unforeseen dangers. The company loses its guarantee of the confidentiality of its most sensitive information, and many legal and security questions remain unanswered. A large...
Security threats affecting user-data on transit in mobile banking applications: A review
September 2023
Mobile banking technology is beneficial to customers because it is convenient for conducting bank services remotely. Newer channels used for mobile banking such as mobile banking applications have been developed as an innovation that is utilized to offer traditional banking services remotely such as money withdrawals, deposits, cheque book requests among others. This saves time and costs of going to physical banking...
Analysis and result of classification algorithm on email classification
July 2019
In this time, one of the most and fastest forms of communication is electronic mail or what we call e-mail. However, the increase of e-mail users has resulted in the dramatic increase of spam emails in the past few years. Spam is the use of electronic messaging systems to send bulk data. In this paper, e-mail data were classified as ham email and spam email using supervised learning algorithms. Three different...
Framework for integrating fragmented information systems: Case of livestock information systems
July 2017
Information System (IS) is used for information communication. But the problem with the existing Agro-ISs is that they are not integrated. To integrate it, we need to have an integration framework. Generally, much has been done on the designing framework for IS integration. However, there are credible things which can be added to improve these frameworks. A framework can be designed in such a way that it guides users on...
In silico study in mitochondrial and chloroplast genomes of plants
May 2016
Simple sequence repeats (SSRs) or microsatellites constitute a countable portion of genomes. However, the significance of SSRs in organelle genomes has not been completely understood. The availability of organelle genome sequences allows us to understand the organization of SSRs in their genic and intergenic regions. In the current study, the mitochondrial and chloroplast genomes of different taxa of plants were...
Issues in a transactional database emanating from data warehouse project
February 2016
When a data warehouse (DW) is built, typical extraction, transformation, and loading operations are made, including cleaning tasks of the data, conflicts resolution, inconsistencies identification, and constrains checking, among others. In this work, two databases (DB) were combined to obtain indexes approved and failing course in basic sciences area (Mathematics, Physics, Chemistry) of the Institute of Technology of...
Real-time operating system (RTOS) with application to play models
October 2014
It is very important to improve the design of the real-time operating system (RTOS) especially if we want to use it in some special devices. Numerous researches have accepted conventional RTOS as being the customary approach for designing devices used by children. This is because these are able to facilitate the implementation different criteria such as clustering, stability and alternate programs. In this paper,...
The comparison of time division multiple access (TDMA) (global system for mobile communication, GSM) and wideband-code division multiple access (W-CDMA) (third generation, 3G) system based on their modulation techniques
July 2014
Mobile network communication system offers the users with seamless communication and this has caused wireless communication to increasingly become the preferred method of carrying multimedia traffic or messages such as voice, video, images, and data files. Time division multiple access (TDMA) is the multiple access scheme used in global system for mobile communication (GSM), while third generation (3G) system uses...
Simulation analysis of proactive, reactive and hybrid routing protocols in mobile ad hoc network using Qualnet simulator 5.0.2
November 2012
Mobile ad hoc networks (MANETs) consist of a collection of wireless mobile nodes which dynamically exchange data among themselves without the reliance on a fixed base station or a wired backbone network. All nodes are mobile and can be connected dynamically in an arbitrary manner. There is no static infrastructure such as base station. All nodes of these networks behave as routers and take part in discovery...
An open source Geographic Information System (GIS) approach to water supply management, distribution and billing
November 2012
In this work a comprehensive solution for the Gatanga Water Trust (GWT) has been developed to assist it in managing its water supply and distribution. The solution comprises two subcomponents: a mapping component and a billing component which are tightly coupled together. The proposed system uses stable open source products for the mapping component and the database. At present the GWT uses outdated maps and...
New Holder-type inequalities for the Tracy-Singh and Khatri-Rao products of positive matrices
May 2012
Recently, authors established a number of inequalities involving Khatri-Rao product of two positive matrices. Here, in this paper, the results are established in three ways. First, we find new Holder-type inequalities for Tracy-Singh and Khatri-Rao products of positive semi-definite matrices. Secondly, the results are extended to provide estimates of sums of the Khatri-Rao and Tracy-Singh products of any...
Design and simulation of an SMS driven microcontroller for home automation using proteus software
May 2012
Technology has moved from a level at which a user is always present in a place before he/she can control or do anything at the place. Imagine what television used to be before the inception of remote control. With the inception of remote control, the television can be controlled while lying on the bed or sitting down on the chair. You do not have to move towards it and press the button on it before you can...
High performance efficiency of distributed optical fiber Raman amplifiers for different pumping configurations in different fiber cable schemes
April 2012
Fiber Raman amplifiers (FRAs) are attractive for ultra wide dense wavelength division multiplexing (UW-DWDM) transmission systems due to their advantages of broad amplification bandwidth and flexible central wavelength. With recent developments of optical pump sources with high power near 1.4 μm wavelength and highly nonlinear fiber having a peak effective Raman gain coefficient, more than ten times that...
Predicting shelf life of dairy product by using artificial neural networks (ANN) and statistical computerized methods
April 2012
Artificial neural networks (ANN) have been developed as generalizations of mathematical models of biological nervous systems. Generalized regression (GR) and multiple linear regression (MLR) models for shelf life prediction of dairy product were developed. Results of both the models were evaluated with three types of prediction performance measures viz., mean square error, root mean square error and...
Fast matrix multiplication techniques based on the Adleman-Lipton model
January 2012
On distributed memory electronic computers, the implementation and association of fast parallel matrix multiplication algorithms has yielded astounding results and insights. In this discourse, we use the tools of molecular biology to demonstrate the theoretical encoding of Strassen’s fast matrix multiplication algorithm with DNA based on an n-moduli set in the residue number system, thereby...
A review on advances in iris recognition methods
January 2012
Iris recognition is one of the most accurate identity verification systems. Since its initial introduction by J. Daughman, many methods have been proposed to enhance the performance. We present an overview of the latest research on iris recognition by categorizing the research in four groups outlined as localization, segmentation, coding and recognition. We present the latest developments explaining advances to solve...
Managing distribution of national examinations using geospatial technologies: A case study of Pumwani and Central divisions
November 2011
Cross layer based miss detection ratio under variable rate for intrusion detection in WLAN
November 2011
The emphasis for the use of wireless LAN in industry is on robustness, reliability and security. Almost any given single secruity mechanism (such as MAC filtering) alone may be easily overcome by attackers. However, proper configuration and implemetation of the maximum possible security mechanism must be used to form a multiple security layers, to provide the best possible wireless protection. The present paper...
A least square approach to analyze usage data for effective web personalization
October 2011
Web server logs have abundant information about the nature of users accessing it. The analysis of the user’s current interest based on the navigational behavior may help the organizations to guide the users in their browsing activity and obtain relevant information in a shorter span of time (Sumathi and Padmaja, 2010). Web usage mining is used to discover interesting user navigation patterns and can be applied to...
A study of indoor positioning by using trigonometric and weight centroid localization techniques
October 2011
An indoor positioning system was developed to provide a fast and easy determination of unknown position coordinates. Wireless sensor nodes (WSN) are employed in a test area. Trigonometry techniques were employed to determine the position of the unknown objects by employing numerical analysis techniques on received signal link quality indicator (LQI) values. The distances between the unknown object position and the WSNs...
Investigation in the deployment of a geographic information system
September 2011
After a presentation of the cereal activities in Tunisia, we present a systemic analysis of project of deployment of a geographic information system (GIS). This analysis is based on the objective oriented project planning (OOPP) method. The exploitation of the systemic analysis method enables us not only to analysis and to identify the information of the cereal activities but also to lead to an efficient...
A shift-add algorithm for computing Bezier curves
April 2011
A shift-add algorithm based on coordinate rotation digital computer algorithm for computing Bezier curves was presented in this paper. This algorithm can be implemented in basic computing system (which deals only with shift, add and logical operations) which exists in many areas. Convergence of the algorithm was proved. Error estimation was analyzed. A numerical experiment was carried out to validate...
Efficient power savings in wireless sensor networks with network coding and overhearing avoidance
March 2011
Hidden markov model based Arabic morphological analyzer
March 2011
Natural language processing tasks includes summarization, machine translation, question understanding, part of speech tagging, etc. In order to achieve those tasks, a proper language representation must be defined. Roots and stems are considered as representations for some of those systems. A word needs to be processed to extract its root or stem. This paper presents a new technique that extracts word...
Towards auto-configuring routing protocols for wireless ad-hoc networks
March 2011
The importance of wireless ad-hoc networks in community and commercial connectivity cannot be underestimated because of the benefits associated with these networks. Self-organization will minimize the need for manual configuration. In essence, self-organization provides an out-of-the-box functionality such that very little technical expertise is required to setup a network. Providing unique IP addresses...
Quality of service constrained task mapping and scheduling algorithm for wireless sensor networks
February 2011
Blind Signal Separation is the task of separating signals when only their mixtures are observed. Recently, Independent Component Analysis has become a favorite method of researchers for attacking this problem. We propose a new score function based on Generalized Laplace Distribution for the problem of blind signal separation for supergaussian and subgaussian. To estimate the parameters of such score function we used...
Blind signal separation based on generalized Laplace distribution
February 2011
Blind Signal Separation is the task of separating signals when only their mixtures are observed. Recently, Independent Component Analysis has become a favorite method of researchers for attacking this problem. We propose a new score function based on Generalized Laplace Distribution for the problem of blind signal separation for supergaussian and subgaussian. To estimate the parameters of such score function we used...
Optimized mask selection for person identification and camera distance measurement based on interocular distance
April 2010
This paper presents a multi-resolution masks based pattern matching method for person identification. The system is commenced with the construction of multi-resolution mask cluster pyramid, where the mask size is chosen depending on the distance between two eyes, computed from the detected face. Experimental results show the effectiveness of the system with significantly higher precision, recall rates and matching...
A survey of agent-oriented software engineering paradigm: Towards its industrial acceptance
April 2010
Agent-oriented software engineering (AOSE) paradigm represents an interesting means of analyzing, designing and building complex software systems quite suitable to new software development requirements. Many scientific researches have been focused on this paradigm, yet its current state still reports relative lack of industrial acceptance compared to others. As a survey of AOSE paradigm, this paper outlines the overall...
Using the OOPP method to analyze complex industrial systems
March 2010
The aim of this paper is to propose a methodology for the analysis and modeling of complex industrial systems and to validate it through a case study. In fact, an effective management of a complex industrial system can be only in systems whose activities are synchronized and enabling a good traceability. The development of a reliable Information System (IS) is primordial. The methodology is divided into five steps and...
Modelling and simulation of electrical machines on the basis of experimental frequency response characteristics
March 2010
The mathematical models of the Asynchronous electrical machines developed on the basis of the experimental frequency-response characteristics are proposed in this paper. The latter ones are recommended for investigating the transient processes occurring at short-circuits and connections of the electrical machines to the bus bars of electrical system taking into account of their rotor speed changes. Key...
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