Department of InformationTechnology Education

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A Comparative Performance Analysis of 6to4 Transition Mechanism over MPLS and Frame Relay using OPNET
(International Journal of Computer Applications, 2020) Boansi, Oliver Kuffour; Asante, Micheal
IPv6 addressing is taking over from IPv4 with the exhaustion of the latter’s address space. However, both versions of IP are incompatible hence the need for transition technologies to ensure their coexistence. This research analyzed the performance of the 6to4 transition mechanism when it ran over two separate WAN technologies namely MPLS and Frame Relay by way of simulating the scenarios using OPNET 14.5. Traffic generated for this analysis were from FTP, Email and Database query, and were used to measure and analyze performance metrics such as end-to-end delay, response time and point to point link utilization over an hour of simulation time to ascertain which WAN and transition mechanism provided the best performance. The simulation values at the end of the research indicated that 6to4 together with MPLS produced lower values for all the performance metrics studied
A Double-ended Contactless Current Traveling Waves Scheme for Fault Location in Overhead Transmission Lines
(World Resources Institute., 2020) P. N., Ayambire; Olusola, Bamisile; Qi, Huang; Paul, Anane; Albert K., Awopone
A Symmetric, Probabilistic, Non-Circuit Based Fully Homomorphic Encryption Scheme
(International Journal of Computer Networks and Applications (IJCNA), 2022) Dagadu, Caleb Joshua; Asante, George; Ben Hayfron-Acquah, James; Asante, Michael
– Traditional encryption allows encrypted data to be decrypted before any computation could be performed on such data. This approach could compromise the security of the data when an untrusted party is involved in the computation. To be able to work on data in its encrypted form, a homomorphic encryption approach is recommended. Homomorphic encryption allows computation to be done on data that has been encrypted and yields the same results that would have been obtained if the computation had been performed on the unencrypted form of the data. Most of the Homomorphic encryption (HE) algorithms are deterministic. These deterministic algorithms produce the same ciphertext for a given data on different occasions. This could allow an adversary to easily predict a plaintext from a ciphertext. Probabilistic algorithms, however, resolve the aforementioned challenge of deterministic algorithms. A probabilistic encryption algorithm ensures different ciphertexts for the same plaintext on different occasions. Another challenge of most homomorphic encryption schemes is the way data is encrypted. Most algorithms encrypt data bit-by-bit (i.e. circuit based). Circuit-based encryption makes the encryption and decryption complex, thereby increasing the running time. To reduce the running time, Non-Circuit based encryption and decryption are preferred. Here, numeric data need not be converted to binary before any encryption is done. To ensure a very secure, efficient but simpler HE scheme, the authors have offered a fully homomorphic encryption (FHE) scheme that is Probabilistic, Non-Circuit based, and uses symmetric keys. Results from the experiment conducted show that the proposed scheme is faster than Fully Homomorphic Encryption over the Integer (DGHV), A simple Fully Homomorphic Encryption Scheme Available in Cloud Computing (SDC), and Fully Homomorphic Encryption by Prime Modular Operation (SAM) schemes. The proposed scheme has a time complexity of O(log(n2 )) and consumes less memory space. Even though HE schemes are naturally slow, the less memory space consumed by the proposed scheme and the time complexity of O (log(n2 )), makes the proposed scheme suitable for real-life implementation such as auction, electronic voting, and in other applications that make use of private data.
Analyses of optimum generation scenarios for sustainable power generation in Ghana
(Brunel University London, 2010) Albert, K. Awopone; Ahmed, F. Zobaa
This study examines optimum generation scenarios for Ghana from 2010 to 2040. The Open Source Energy Modelling System (OSeMOSYS), an optimisation model for long term energy planning, which is integrated in Long-range Energy Alternatives Planning (LEAP) tool, was applied to model the generation system. The developed model was applied to the case study of the reference scenario (OPT) which examines the least cost development of the system without any shift in policy. Three groups of policy scenario were developed based on the future possible energy policy direction in Ghana: energy emission targets, carbon taxes and transmission and distribution losses improvements. The model was then used to simulate the development of technologies in each scenario up to 2040 and the level of renewable generation examined. Finally, cost benefit analysis of the policy scenarios, as well as their greenhouse gas mitigation potential were also discussed. The results show that: suitable policies for clean power generation have an important role in CO2 mitigation in Ghana. The introduction of carbon minimisation policies will also promote diversification of the generation mix with higher penetration of renewable energy technologies, thus reducing the overall fossil fuel generation in Ghana. It further indicated that, significant greenhouse emissions savings is achieved with improvement in transmission and distribution losses.
Assessment of optimal pathways for power generation system in Ghana
(Cogent Engineering, 2017) Albert, K. Awopone; Ahmed, F. Zobaa; Walter, Banuenumah
: This study applied the Open Source Energy Modelling System (OSeMOSYS), an optimisation model for long term energy planning, which is integrated in Long range Energy Alternatives Planning (LEAP) to develop optimal generation pathways and dispatch scheduling of selected generating technologies for power generation in Ghana. Simulating conventional and non-conventional energy technologies, the study examines the technological, economic and environmental implications of re newable energy policies from 2010 to 2040. Sensitivity analyses were undertaken to determine the effect of varied development in non-conventional renewable energy technologies investment cost as well as fuel prices. The findings suggest that, with a comprehensive implementation of energy efficiency and other strategies, renewable energy technologies can contribute more than 70% of the generation requirement in Ghana by 2040. This will result in significant economic and environmental ben efits as well as sustainability of the energy sector.
Chaotic Medical Image Encryption Based on Arnold Transformation and Pseudorandomly Enhanced Logistic Map
(Journal of Multidisciplinary Engineering Science and Technology (JMEST), 2017) Dagadu, Caleb Joshua; Jianping, Li; O. Aboagye, Emelia; Xuedzi, Ge
Transmission and storage of digital medical images for telemedicine facilitates healthcare delivery. However, this gives rise to security concerns such as confidentiality integrity and reliability. In this paper, an efficient chaotic encryption scheme is proposed for gray scale medical images using Arnold cat map and pseudorandomly enhanced chaotic map. The scheme achieves secure encryption by Arnold transformation followed by pixel value modification with chaotic key sequence. The robustness of the scheme is measured by various metrics such as histogram analysis, key sensitivity and information entropy. Furthermore, we compare the efficiency of the pseudorandomly enhanced logistic map with the logistic map. The initial experimental results show that the scheme promises stronger resistance against diverse forms of common attacks.
Comparative analysis of convergence times between RIP And EIGRP routing protocols in a network
(Research Journal of Computer Science, 2015) Boansi, Oliver Kuffour; Panford, Joseph Kobina; Yehuza, Rasheeda Mendeeya; Riverson, Kwabena
The convergence time of a network is very essential to a network. Networks that converge faster are considered to be very reliable. Users of the network appreciate it when they are always able to access resources. The research was carried out to compare the convergence of two routing protocols namely RIP and EIGRP. Network scenarios were created and a simulation was performed using packet tracer to measure the convergence times of both protocols separately. Results indicated that EIGRP had the fastest convergence time and both protocols’ convergences were not affected by a change in topology. This will help network administrators in their choice of protocols
Compliance In Education Institutions Based On Students Experience Survey
(2015-05-29) Adasa Nkrumah Kofi Frimpong; Petra Maria Asprion
In this paper, we follow a survey approach to analyse the level of compliance with study and examination regulations governing two educational institutions in Switzerland. The results revealed that compliance with automatic registration was different in the two investigated units of analysis and in both we found deficiencies in compliance-related activities. For example in both institutions the deregistration process was not compliant because students were most often not informed about the process. In addition we found a compliance imbalance regarding the extent of assessments. With regard to the examination supervision the status of compliance was much better in one of the two analysed units. However, compliance regarding lecture sessions seemed balanced.
Cultural orientations and product innovation in the Ghanaian banking sector
(THE SERVICE INDUSTRIES JOURNAL, 2019-01-09) Jenkins Atarisigna Asaah; Shao Yunfei; Kwame Ansong Wadei; Kofi Frimpong Adasa Nkrumah
The Ghanaian banking sector plays a major role in the socio economic development of the country. However, the banks are faced with many challenges which include growing customers’ demands, inadequate innovation practices and poor financial performance. With the advent of Information Communication Technologies (ICTs), there are calls for the banks to be more innovative. The paper explores the influence of organizational cultural orientations on product innovation. It also examines the moderating effect of extrinsic motivators on such relationships. Hypotheses were formulated and tested using data collected from the banking sector in Ghana. The findings are that innovate oriented and compete-oriented cultures have a direct positive influence on product innovation. Both Informational Extrinsic Motivators (IEMs) and Controlling Extrinsic Motivators (CEMs) moderate the relationship between innovate-oriented, compete oriented cultures and product innovation such that they diminish the positive relationship that exists between such variables. The paper offers theoretical contribution and managerial implications which are discussed.
Development dimensions of E-Commerce in Bangladesh: Scope, challenges and threats
(2018-08) Adasa Nkrumah Kofi Frimpong; Md Nazirul Islam Sarker; Md Altab Hossin; Yin Xiaohua
The main purpose of the study is to explore the scope, challenges and threats of e-commerce as well as its development dimensions in Bangladesh. The study uses survey findings, SWOT analysis approach and case study of two top ranking e-commerce business institutions in Bangladesh. The study also uses secondary data through extensive literature review. It reveals that there is a great prospect of e-commerce in Bangladesh with growing trust, e commerce facilities, security, people’s awareness and transformation from traditional shopping to online shopping. It also explores that people like online shopping due to its convenience, security and time saving nature. The study further reveals that quality of the product, consumer dishonesty, lack of proper cyber security in some e-commerce site, unavailable banking facility, product availability and mandatory credit card requirement are the major challenges to the development of e commerce in Bangladesh. The article suggests that a proper initiative should be taken by the government to implement ICT policy properly for smooth running e-commerce business in Bangladesh and achieving goals of digital Bangladesh.
Digital Video Broadcasting-Return Channel via Satellite (DVB-RCS) Implementation in Ghana for Maritime and Other Mobile Communication
(Communications on Applied Electronics (CAE) – ISSN : 2394-4714 Foundation of Computer Science FCS, New York, USA, 2016-02) Asante, George; Akom, Kingsley; Frimpong- Adjei, Bernard
This paper presents solution to developing trends in next generation satellite communication technologies which have significant implication on maritime and mobile communication systems based on specific need and significant broadband connectivity, quality delivery of service and interactivity in Ghana. Due to the narrow bandwidth of terrestrial access links and the enormous costs for increasing bandwidth in remote location and enabling IP-multicast streaming for access, a satellite overlay network using Digital Video Broadcasting Return channel service (DVB-RCS) technology will be examined and the infrastructure required for communication, navigation and surveillance selected for implementation. The satellite network will delivers live streaming of voice, data and video over IP contents simultaneously to numerous users in every remote location. An overview of the technical aspect will be implemented in order to establish quality infrastructures, allowing the services of DVB-RCS distributed via satellite. The paper also outlines DVB-RCS benefits which will be achieved in practice, based on requirements from implementing these applications in urban, rural and mobile environments including maritime solutions.
Drive-In As E-Commerce Strategy In Ghana
(2016-05) Adasa Nkrumah Kofi Frimpong; Samuel Adu Gyamfi
The study sought to critically analyze the impact, awareness and importance of Drive-In as electronic commerce strategy in Ghana. The high demand of consumers and competition among Ghanaian markets has caused changes in electronic commerce strategy as a result of technological innovations, increased awareness and improved supply chain management. This paper uses Ababio Express (a supermarket in Ghana) as a case study in exploring the impact, awareness and importance of Drive-In as e-commerce strategy. On the whole, a “Drive-In” framework was proposed which formed the basis for a successful e-commerce site to aid online shopping. The study revealed that E-commerce is one of the fastest and easiest way of shopping for busy people in Ghana. This has made the transition to internet shopping a necessity for organizations. Despite its benefits, developing countries still lag behind in the adoption of electronic commerce. The study further explored the history of drive-in markets in other countries, their impacts and innovations as time went on and drive-in today. The findings show that there is room for service quality as in improving online shopping in the Ghanaian supermarkets. Recommendations and suggestions for future research were presented in the end.
DWT BASED ENCRYPTION TECHNIQUE FOR MEDICAL IMAGES
(1 International Centre for Wavelet Analysis and Its Applications, 2016) Dagadu, Caleb Joshua; Jian-Ping, Li; Fadia, Shah; Nadir, Musafa; Kamlesh, Kumar
The security of medical images has attracted much attention recently, especially when these images are hosted by third party cloud service providers and therefore must be sent through the communication networks. A key challenge in the cloud computing paradigm is the design of efficient security schemes that help address the issues of confidentiality, integrity and authentication. Consequently, we propose a fast and robust encryption technique for gray scale medical images for real time applications. Our technique first compresses the medical image in the discrete wavelet transform (DWT) domain before encrypting with an algorithm based on basic pixel permutation and randomness. In the DWT domain, correlation and redundancy are reduced while random pixel permutation with encryption key provides confusion and diffusion. Our simulation results demonstrate the potentials of our technique.
E-Banking Preferences and Middle Class Values in Ghana
(Journal of Computer Sciences and Applications, 2016, 2016) Dagadu, Caleb Joshua; Opoku Aboagye, Emelia; Opokua Ansong, Mary; Asante Antwi, Henry; Agbezuge, Eric
The study was premised to assess E-Banking Preferences and Middle Class Values in Ghana in far reaching and inclusive way. The researchers adopted the positivist research paradigm. Overall, five hundred (500) customers were randomly sample from 26 banks in Ghana to participate in the study. A questionnaire containing 35 items were used to collect the data from the target population and the items were scaled on 5-points Likert scale to compute and assess the responses. The data were analysed with the aid of Predictive Analytic Software (PASW). The regression results show that Sheth-Newman Gross Model of Consumption Values was significant in predicting customers’ e-banking adoption in Ghana. ANOVA reveals a p-value of 0.000. The study further revealed that 92.2% variation in use of e-banking are due to social values and conditional values. The study again reveals that functional and epistemic values are not significant predictors of use of e-banking (p-value>0.05). Meanwhile, emotional value has significant and inverse relationship with use of e-banking (β=-24.2%). The descriptive results also revealed that, direct deposit and withdrawal services were the appropriate and satisfactory service preferred by clients showing the mean of 4.1879 and the standard deviation of 0.7. Again, ATM was identified as the next appropriate and satisfactory service preferred by clients revealing the means of 4.0 and standard deviation of 1.0. However, the less appropriate and satisfactory services use by client was Electronic fund transfer at point of sale (EFTPOS) showing the mean of 3.6222 and standard deviation of 0.77975. We herein propose the banks to adopt excellent customer education to improve public confidence in the system such as Deming 14 Principles on Quality Service and the Japanese Kaisen Principles to ensure complete e-banking adoption in the banking industry.
Efficient and Scalable Matrix Factorization Transfer with Review Helpfulness for Massive Data Processing
(Journal of Computer Sciences and Applications, 2017, 2017) Dagadu, Caleb Joshua; Aboagye, Emelia Opoku; Jianbin, Gao; Qi, Xia
We explore the sparsity problem associated with recommendation system through the concept of transfer learning (TL) which are normally caused by missing and noisy ratings and or review helpfulness. TL is a machine learning (ML) method which aims to extract knowledge gained in a source task/domain and use it to facilitate the learning of a target predictive function in a different domain. The creation and transfer of knowledge are a basis for competitive advantage. One of the challenges prevailing in this era of big data is scalable algorithms that process the massive data in reducing computational complexity. In the RS field, one of the inherent problems researchers always try to solve is data sparsity. The data associated with rating scores and helpfulness of review scores are always sparse presenting sparsity problems in recommendation systems (RSs). Meanwhile, review helpfulness votes helps facilitate consumer purchase decision-making processes. We use online review helpfulness votes as an auxiliary in formation source and design a matrix transfer framework to address the sparsity problem. We model our Homogenous Fusion Transfer Learning approach based on Matrix Factorization HMT with review helpfulness to solve sparsity problem of recommender systems and to enhance predictive performance within the same domain. Our experiments show that, our framework Efficient Matrix Transfer Learning (HMT) is scalable, computationally less expensive and solves the sparsity problem of recommendations in the e-commerce industry.
Feasibility analysis of off-grid hybrid energy system for rural electrification in Northern Ghana
(Cogent Engineering, 2021) Albert, K. Awopone
This study examines the feasibility of a stand-alone photovoltaic, diesel generator and battery storage hybrid power system for the electrification of off-grid rural areas in northern Ghana. The HOMER software package was used for simula tion analysis. Five optimization scenarios considered feasible by HOMER were eval uated. The evaluation criteria include net present cost (NPC), cost of energy (COE) and emissions. The results indicate that PV/diesel/battery storage hybrid system is the most feasible, optimized, cost-effective and environmentally friendly system among the systems considered. This system has a Cost of Energy (COE) of 0.399 $/kWh and an NPC of $296,552. Although this COE is approximately three times the current energy cost in Ghana, sensitivity analysis shows that changing certain parameters such as fuel costs, and capital subsidies can reduce COE. This shows that if policymakers create the necessary investment environment, such projects can be a viable alternative to rural electrification.
Impact of Banking and Financial Systems on Environmental Sustainability: An Overarching Study of Developing, Emerging, and Developed Economies
(2020-09-30) Sandra Chukwudumebi Obiora; Olusola Bamisile; Evans Opoku-Mensah; Adasa Nkrumah Kofi Frimpong
In recent years, the developed, emerging, and developing economies have prioritized environmental sustainability attainment. In an attempt to offer some potential policy choices towards the achievement of sustainable development, this paper shifts emphasis from the popularly discussed economic development and carbon emissions nexus. Instead, we examine the impact of the banking and financial system’s activities on carbon emissions for a sample of 45 countries. These are comprised of developed, emerging, and developing countries between 1990 and 2017. To fill the gap in the literature, the nexus is examined in seven different phases. This study exposes robust and reliable empirical results with the use of Feasible General Least Squares, random effects with regards to the Durbin–Wu–Hausman test, and Difference General Method of Moments panel data estimation models. Our findings indicate that the increase of domestic credit to the private sector and commercial bank lending consistently contributes towards aggravated carbon emissions in all economic types. Additionally, increased deposit rates in developing economies, increased lending rates in developed economies, and increased deposit rates in emerging economies contribute towards the overall reduction of carbon emissions. The decrease in lending to high GHG emitting members of the private sector by financial institutions in all economies is recommended based on the results of this study.
Influence of picture presence in reviews on online seller product rating: Moderation role approach
(KSII TRANSACTIONS ON INTERNET AND INFORMATION SYSTEMS, 2019-12-31) Md Altab Hossin; Yinping Mu; Jiaming Fang; Adasa Nkrumah Kofi Frimpong
Online consumer reviews (OCRs) provide product information and recommendations especially pictures in reviews depict the true information about the product. This study investigates the influence of pictured reviews on online seller (for a particular product of a seller) rating with moderating effect of price, brand type (foreign vs local), goods type (experience vs search), and brand familiarity. Multiple robust linear regression analysis with moderation interaction and quadratic effect used to explain the relationship of the explanatory variables with the criterion variable. We collected cross-sectional data from the two most renowned Chinese online shopping platforms (B2C) of total 15,621 product links. Results show that higher number of reviews with a low ratio of picture reviews response negative effect on rating, whereas the lower number of reviews with a high ratio of picture reviews response positive effect on the rating. In overall picture in the reviews improve the online seller product rating. For the moderation effect, results show that price and brand familiarity have a positive interaction effect on the relation of pictured reviews and rating whereas experience goods have less negative effect comparing search goods. Finally, local brand has less negative interaction effect comparing foreign brand to pictured reviews and rating.
Influencing Factors of Students’ Smartphones Use for Academic Purposes: A Developing Country’s Perspective
(2021) Gyamfi, Adu Samuel
There is evidence that majority of students in many African coun tries own and use smartphones. Due to their portability and the many functions, they are used to perform, smartphones have virtually become a necessity. In ed ucation, it is known to facilitate communication and knowledge sharing among students. Yet, many students use smartphones for entertainment purposes. Worst of all, research that investigates the factors that influence students’ use of smartphones for learning are scarce particularly, in many African countries. Therefore, this study examines the influencing factors of smartphone use for ac ademic purposes. It deviates from the few existing studies that have predomi nantly drawn samples from tertiary students of developed countries. The study presented a research model founded on UTAUT 2. Responses were gathered from 708 Ghanaian high school students using a questionnaire. Based on these responses, Partial Least Square Structural Equation Modelling was used to vali date the model. The results confirmed that Effort Expectancy, Facilitating Con ditions and Social Influence have significant influence on Hedonic Motivation and Perceived Usefulness. Similarly, Habit and Price Value mediated the effects of Hedonic Motivation and Perceived Usefulness on Behavioural Intention and Use Behaviour. The findings suggest that, educational institutions must provide the necessary support conditions for students to use smartphones for learning
Leveraging VOIP on Local Area Network using Java Media Framework
(International Journal of Computer Applications (0975 – 8887), 2015-03-19) Asante, George; K., Riverson; Acquah,-J.B Hayfron
Voice over Internet Protocol (VoIP) is a standard for taking analogue audio signals, and turning them into digital data that can be transmitted over a network. VoIP has become an important factor in network communication. It has a lower operational cost, greater flexibility, and a variety of enhanced applications. VoIP is time – based. To ensure real-time transmission, Real-Time Transmission Protocol (RTP) is used on top of User Datagram Protocol (UDP). RTP provides end to-end network transport functions suitable for applications transmitting real-time data, such as audio, video or simulation data, over multicast or unicast network services. Java Media Framework (JMF) is an Application Programming Interface (API) that uses RTP and therefore ideal for time-based media. Thus, the topic: leveraging VOIP on LAN using Java Media Framework. The research aims at designing a system that will allow users to communicate over a data network. That is to be able to send text, make voice and video call, and transfer file over a network. The system uses client/server architecture. The architecture is a 3-tier: the client, the main server and the database server. The system designed could be used on Android mobile phones and computers with Windows operating system.The outcome of the research will allow users to communicate at virtually no cost. The product will also put the network of various organizations into full utilization.

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