Browsing by Author "Nyongesa, Henry O."

Now showing 1 - 6 of 6
  • Thumbnail Image
    Item
    Digital watermarking: a state-of-the-art review
    (IIMC International Information Management Corporation, 2010) Adesina, Ademola Olusola; Nyongesa, Henry O.; Agbele, Kehinde K.
    Digital watermarking is the art of embedding data, called a watermark, into a multimedia object such that the watermark can be detected or extracted later without impairing the object. Concealment of secret messages inside a natural language, known as steganography, has been in existence as early as the 16th century. However, the increase in electronic/digital information transmission and distribution has resulted in the spread of watermarking from ordinary text to multimedia transmission. In this paper, we review various approaches and methods that have been used to conceal and preserve messages. Examples of real-world applications are also discussed.
  • Thumbnail Image
    Item
    Ensuring the security and privacy of information in mobile health-care communication systems
    (Academy of Science of South Africa, 2011) Adesina, Ademola Olusola; Agbele, Kehinde K.; Februarie, Ronald; Abidoye, Ademola P.; Nyongesa, Henry O.
    The sensitivity of health-care information and its accessibility via the Internet and mobile technology systems is a cause for concern in these modern times. The privacy, integrity and confidentiality of a patient’s data are key factors to be considered in the transmission of medical information for use by authorised health-care personnel. Mobile communication has enabled medical consultancy, treatment, drug administration and the provision of laboratory results to take place outside the hospital. With the implementation of electronic patient records and the Internet and Intranets, medical information sharing amongst relevant health-care providers was made possible. But the vital issue in this method of information sharing is security: the patient’s privacy, as well as the confidentiality and integrity of the health-care information system, should not be compromised. We examine various ways of ensuring the security and privacy of a patient’s electronic medical information in order to ensure the integrity and confidentiality of the information.
  • Thumbnail Image
    Item
    ICT and information security perspectives in E-Health Systems
    (Medwell Journals, 2010) Agbele, Kehinde K.; Nyongesa, Henry O.; Adesina, Ademola Olusola
    This study examines issues pertinent to the rapidly evolving use of information as a currency of modern economies. Access to information has important benefits that can be achieved in many areas including, social-economic development, education and healthcare. In healthcare, for example, access to appropriate information can minimise visits to physicians and periods of hospitalisation for patients suffering from chronic conditions, such as asthma, diabetes, hypertension and HIV/AIDS. This will in turn reduce the cost of healthcare provision. This study examines theoretical and conceptual aspects of E-health as an ICT application area. Various definitions are presented in order to expound concepts associated with E-health. In the study, the links to a successful chain of trust to manage patient health records for E-health deployment are described. These are based on four technology pillars: identity management, asset management, data storage and information security. Practical solutions for integration of E-health with human, material and financial resources are explored.
  • Thumbnail Image
    Item
    A Mobile-Health Information Access System
    (Telkom, 2013) Adesina, Ademola Olusola; Nyongesa, Henry O.
    Patients using the Mobile-Health Information System can send SMS requests to a Frequently Asked Questions (FAQ) web server with the expectation of receiving an appropriate feedback on issues that relate to their health. The accuracy of such feedback is paramount to the mobile search user. However, automating SMS-based information search and retrieval poses significant challenges because of the inherent noise in SMS communication. First, in this paper an architecture is proposed for the implementation of the retrieval process, and second, an algorithm is developed for the best-ranked question-answer pair retrieval. We present an algorithm that assists in the selection of the best FAQ-query after the ranking of the query-answer pair. Results are generated based on the ranking of the FAQ-query. Our algorithm gives a better result in terms of average precision and recall when compared with the naıve retrieval algorithm.
  • Thumbnail Image
    Item
    A novel approach integrating ranking functions discovery, optimization and infernce to improve retrieval performance
    (Medwell Journals, 2010) Agbele, Kehinde K.; Adesina, Ademola Olusola; Nyongesa, Henry O.; Febba, Ronald
    The significant roles play by ranking function in the performance and success of Information Retrieval (IR) systems and search engines cannot be underestimated. Diverse ranking functions are available in IR literature. However, empirical studies show that ranking functions do not perform constantly well across different contexts (queries, collections, users). In this study, a novel three-stage integrated ranking framework is proposed for implementing discovering, optimizing and inference rankings used in IR systems. The first phase, discovery process is based on Genetic Programming (GP) approach which smartly combines structural and contents features in the documents while the second phase, optimization process is based on Genetic Algorithm (GA) which combines document retrieval scores of various well-known ranking functions. In the 3rd phase, Fuzzy inference proves as soft search constraints to be applied on documents. We demonstrate how these two features are combined to bring new tasks and processes within the three concept stages of integrated framework for effective IR.
  • Thumbnail Image
    Item
    Text Messaging a tool in e-Health services
    (Telkom, 2010) Adesina, Ademola Olusola; Agbele, Kehinde K.; Nyongesa, Henry O.
    HIV/AIDS continues to be a menace to the global community, especially in sub-Saharan Africa and South Africa is not an exception. The infection rate is continues to grow, in particular, among the young adults. Cell phones have been identified as one of the tools that can be used to overcome the challenge of information dissemination regarding HIV/AIDS among young adults because of its acceptability within this age group. Access to appropriate information can be a powerful for prevention and management of many chronic illnesses, including hypertension, diabetes and HIV/AIDS. Within the young adults age group information access by use of Short Messaging Services (SMS) becomes particularly appealing. In this regard, it is proposed to provide access to carefully screened information on HIV/AIDS within the context of frequently asked questions (FAQ) system. However, automating SMS-based information search and retrieval poses significant challenges because of the inherent noise in SMS communications. In the paper, a special corpus of SMS messages was collected based on a standardised question-answer collection. The SMS messages were then analysed, transcribed and classified, with the aim of building a dictionary of SMS-speak to English translations, with reference to HIV/AIDS.