Browsing by Author "Katsriku, F.A."
Now showing 1 - 8 of 8
Results Per Page
Sort Options
Item El Niño-Southern Oscillation forecasting using complex networks analysis of LSTM neural networks(Artificial Life and Robotics, 2019-06-04) Broni-Bedaiko, C.; Katsriku, F.A.; Unemi, T.; Atsumi, M.; Abdulai, J-D.; Shinomiya, N.; Owusu, E.Arguably, El Niño-Southern Oscillation (ENSO) is the most influential climatological phenomenon that has been intensively researched during the past years. Currently, the scientific community knows much about the underlying processes of ENSO phenomenon, however, its predictability for longer horizons, which is very important for human society and the natural environment is still a challenge in the scientific community. Here we show an approach based on using various complex networks metrics extracted from climate networks with long short-term memory neural network to forecast ENSO phenomenon. The results suggest that the 12-network metrics extracted as predictors have predictive power and the potential for forecasting ENSO phenomenon longer multiple steps ahead.Item Framework for time relevant water monitoring system(Computing in Research and Development in Africa: Benefits, Trends, Challenges and Solutions, 2015) Katsriku, F.A.; Wilson, M.; Yamoah, G.G.; Abdulai, J.D.; Rahman, B.; Grattan, K.The emergence of telecommunications in the last decade and advances in the field of instrumentation have enabled many new applications to be developed in particular for remote monitoring of physical environment by sensors spatially distributed. A framework for water quality monitoring is been proposed based on a telecommunications infrastructure. In this proposal, we review some of the benefits that may be derived by developing nations and key challenges that need to be addressed in the monitoring of water quality for rural communities in Africa. It is proposed that Fibre Optic Sensors can be used to design compact and highly efficient sensor systems. The proposed framework may be extended to other areas of national economic importance. © Springer International Publishing Switzerland 2015.Item Implementation and Evaluation of WLAN 802.11ac for Residential Networks in NS-3(Journal of Computer Networks and Communications, 2018-03) Amewuda, A.B.; Katsriku, F.A.; Abdulai, J.D.Wi-Fi has been an amazingly successful technology. Its success may be attributed to the fact that, despite the significant advances made in technology over the last decade, it has remained backward compatible. 802.11ac is the latest version of the wireless LAN (WLAN) standard that is currently being adopted, and it promises to deliver very high throughput (VHT), operating at the 5 GHz band. In this paper, we report on an implementation of 802.11ac wireless LAN for residential scenario based on the 802.11ax task group scenario document. We evaluate the 802.11ac protocol performance under different operating conditions. Key features such as modulation coding set (MCS), frame aggregation, and multiple-input multiple-output (MIMO) were investigated. We also evaluate the average throughput, delay, jitter, optimum range for goodput, and effect of station (STA) density per access point (AP) in a network. ns-3, an open source network simulator with features supporting 802.11ac, was used to perform the simulation. Results obtained indicate that very high data rates are achievable. The highest data rate, the best mean delay, and mean jitter are possible under combined features of 802.11ac (MIMO and A-MPDU).Item Network Performance Metrics for Energy Efficient Scheduling in Wireless Sensor Networks (WSNs)(Hindawi, 2021) Engmann, F.; Adu-Manu, K.S.; Abdulai, J.; Katsriku, F.A.In Wireless Sensor Networks, sensor nodes are deployed to ensure continuous monitoring of the environment which requires high energy utilization during the data transmission. To address the challenge of high energy consumption through frequent independent data transmission, the IEEE 802.11b provides a backoff window that reduces collisions and energy losses. In the case of Internet of Things (IoTs), billions of devices communicate with each other simultaneously. Therefore, adapting the contention/ backoff window size to data traffic to reduce congestion has been one such approach in WSN. In recent years, the IEEE 802.11b MAC protocol is used in most ubiquitous technology adopted for devices communicating in the IoT environment. In this paper, we perform a thorough evaluation of the IEEE 802.11b standard taking into consideration the channel characteristics for IoT devices. Our evaluation is aimed at determining the optimum parameters suitable for network optimization in IoT systems utilizing the IEEE 802.11b protocol. Performance analysis is made on the sensitivity of the IEEE 802.11b protocol with respect to the packet size, packet delivery ratio (PDR), end-to-end delay, and energy consumption. Our studies have shown that for optimal performance, IoT devices using IEEE 802.11b channel require data packet of size 64 bytes, a data rate of 11Mbps, and an interpacket generation interval of 4 seconds. The sensitivity analysis of the optimal parameters was simulated using NS3. We observed PDR values ranging between 27% and 31%, an average end-to-end delay ranging within 10-15 ms while the energy remaining was between 5.59 and 5.63Joules. The results clearly indicate that scheduling the rate of packet generation and transmission will improve the network performance for IoT devices while maintaining data reliability.Item Performance Evaluation of Chromatic Dispersion Compensation Techniques in Single Mode Fibre for Radio over Fibre Applications(Science and Development (A Journal of the College of Basic and Applied Sciences (CBAS), University of Ghana), 2017-12) Dankwa, I.; Katsriku, F.A.; Amewuda, A.B.; Yamoah, G.G.; Abdulai, J-D.With the increasing growth and high demand for data, fiber optic transmission, especially radio over fibre (RoF), has become a viable option for data and wireless communication. In such systems however, dispersion is a huge limiting factor in achieving the high data transmission rates. This work reviews current dispersion systems and proposes a system of dispersion compensation with fibre grating. Simulations are conducted using Optisystem 7.0 at varied data rates of 10, 20 and 40Gbps over a 200km transmission distance. The output is analyzed on parameters such as bit error rate (BER), Q-factor and eye height. It is shown that data rate exceeding 10 GB/s is achievable over a 200km distance.Item Prolonging the Lifetime of Wireless Sensor Networks: A Review of Current Techniques(Wireless Communications and Mobile Computing, 2018-08) Engmann, F.; Katsriku, F.A.; Abdulai, J.D.; Adu-Manu, K.S.; Banaseka, F.K.There has been an increase in research interest in wireless sensor networks (WSNs) as a result of the potential for their widespread use in many different areas like home automation, security, environmental monitoring, and many more. Despite the successes gained, the widespread adoption of WSNs particularly in remote and inaccessible places where their use is most beneficial is hampered by the major challenge of limited energy, being in most instances battery powered. To prolong the lifetime for these energy hungry sensor nodes, energy management schemes have been proposed in the literature to keep the sensor nodes alive making the network more operational and efficient. Currently, emphasis has been placed on energy harvesting, energy transfer, and energy conservation methods as the primary means of maintaining the network lifetime. These energy management techniques are designed to balance the energy in the overall network. The current review presents the state of the art in the energy management schemes, the remaining challenges, and the open issues for future research work.Item Soil Medium Electromagnetic Scattering Model for the Study of Wireless Underground Sensor Networks(Hindawi, 2021) Banaseka, F.K.; Franklin, H.; Katsriku, F.A.; Abdulai, J.; Ekpezu, A.; Wiafe, I.In recent years, there has been keen interest in the area of Internet of Things connected underground, and with this is the need to fully understand and characterize their operating environment. In this paper, a model, based on the Peplinski principle, for the propagation of waves in soils that takes into account losses attributable to the presence of local inhomogeneity is proposed. In the work, it is assumed that the inhomogeneities are obstacles such as stones or pebbles, of moderate size, all identical and randomly distributed in space. A new wave number is obtained through a combination of the multiple scattering theory and the Peplinski principle. Since the latter principle considers the propagation in a homogeneous medium (without obstacles), the wave number it provides is inserted into the one resulting from the former, the multiple scattering theory. The effective wave number thus obtained is compared numerically with that of Peplinski alone on the one hand and with that of multiple scattering alone on the other hand. The phase velocity and the loss tangent are analyzed against the particle concentration at the low-frequency Rayleigh limit condition (ka ≲ 0:1) and against the frequency at two particle concentrations (c = 0:2 and c = 0:4), two particle radii (a = 0:55 cm and a = 1:10 cm), and 5% and 50% volumetric water content of the soil. Path losses are also compared to each other to examine the effects on transmission of soil containing obstacles. The results obtained suggest that the proposed model has better accuracy in estimating the wave number than previously used schemes.Item Understanding trust on social networking sites among tertiary students: An empirical study in Ghana(Applied Computing and Informatics, 2019-07-01) Wiafe, I.; Koranteng, F.N.; Katsriku, F.A.; Apau, R.User trust in social networking sites (SNS) has become an important issue in SNS discussions. This is because of its impact on knowledge sharing, social commerce, social interaction, among many others. However, information systems researchers have primarily explored the benefits of trust with little attention to its antecedents. In an attempt to address this knowledge gap, this study proposed a model that investigated the factors that promote trust among SNS users. Data was gathered from voluntary respondents using a questionnaire. A PLS-SEM analysis of 912 valid responses suggested that Norm of Reciprocity, Social Interaction Ties and Identification are significant factors that encourage Trust among SNS users. Shared Language was also identified to have impact on Norm of Reciprocity, Social Interaction Ties and Identification. The results of the study provide significant theoretical and practical contributions. They bridge the knowledge gap regarding the formation of Trust on SNS. The model evaluated explains 49.6% of the variance in Trust and thus suitable for analyzing the antecedents of Trust on SNS. Furthermore, with the significance of Identification, Social Interaction Ties and Norm of Reciprocity on Trust, SNS developers are tasked to offer SNS features that proliferate the formation of these factors as well as shared interpretations. 2019 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).