Dr. Tadiwa Elisha Nyamasvisva - Academia.edu (original) (raw)

Papers by Dr. Tadiwa Elisha Nyamasvisva

Education reform and development, Jun 20, 2024

JISR on Computing, Dec 31, 2022

Journal of critical reviews, 2020

2018 IEEE 21st International Multi-Topic Conference (INMIC), 2018

Sea Bed Logging (SBL) is a use of the marine controlled source electromagnetic (CSEM) technique t... more Sea Bed Logging (SBL) is a use of the marine controlled source electromagnetic (CSEM) technique that is utilized to recognize potential nearness of hydrocarbon by utilizing a Horizontal Electric Dipole (HED) reception apparatus. It is liable to produce EM waves and accepting them through batch of sea floor electric field receivers. This method sometime has been vastly opted to diminish the element of inaccurate mapping that leads to false drilling at locations causing massive amount of capital loss and time. Marine EM equipment development continues to be an active research and development area for both industry and academia. In order for the miniaturization of such circumstances several modifications can be made to the instrumentation for the improved and more efficient outcomes. Along with other elements involved in the process, amplifier specially has its own relevance and yet can be enhanced further for the better propagation and improved performance of transmitters. After careful calculations, the seabed model has been mimicked in lab scale tank comprising of under-burden layer, over-burden layer, hydrocarbon reservoirs and sea water. An amplifier system is designed especially for the current experimental setup. The effect was studied under application of multiple frequencies upon which various gains were also obtained. The promising response reveals that by concentrating on the amplifier system, potential oil reservoirs can be explore more efficiently.

Research Journal of Applied Sciences, Engineering and Technology, 2014

Procedia Technology, 2013

The wireless technology has been increasingly evolving in the world of healthcare applications wh... more The wireless technology has been increasingly evolving in the world of healthcare applications where the medical devices, information technology and communications have started to converge and has the potential to revolutionize. The technology of Radio Frequency Identification (RFID) has shown great promise in helping healthcare improves patient's safety and achieving efficient operation. Due to the increment of human errors and patients also the decrement of medical staff, researchers found that the RFID technology is chosen to be a suitable solution. However, the current RFID tag is seen to have several setbacks in obtaining an efficient and accurate data transfer also to support continuous data transmission. This paper discusses on the limitation and its possible solution in order to obtain better network for healthcare.

2014 International Conference on Computer and Information Sciences (ICCOINS), 2014

This research aims to apply the FASTICA and Infomax algorithm in the field of seabed logging, by ... more This research aims to apply the FASTICA and Infomax algorithm in the field of seabed logging, by utilizing the Principal Component Analysis (PCA) as preprocessor. All the three algorithms are statistical algorithms used for signal deconvolution and are respectively in the field of Independent Component Analysis (ICA). In seabed logging (SBL) implies the marine controlled source electromagnetic (CSEM) technique for the detection of hydrocarbons underneath the seabed floor. The results from SBL, indicate the presence of Hydrocarbon, but due to the presence of noise, in the form of airwaves, interfere with the signals from the subsurface and tend to dominate the receiver response. Hence, the Infomax and FASTICA de-convolution algorithms are used, considering PCA as a pre-processor to filter out the airwaves which disrupt the subsurface signals within the receiver response. The results obtained from simulations and their comparative analysis, indicate that the results from the infomax algorithm are better.

2014 International Conference on Computer and Information Sciences (ICCOINS), 2014

This paper focuses on the detection of hydrocarbon layers under the seabed using Electromagnetic ... more This paper focuses on the detection of hydrocarbon layers under the seabed using Electromagnetic methods and to prove the relationship between the thickness and resistivity constrast of the hydrocarbon. Simulations have been carried out by varying the depth of seawater from 1000m to 100m and the resistivity contrast and thickness for each level of depth is also varied. The electric field is also measured using various simulation models and graphs over different offsets. The results obtained prove that the resistivity property of Hydrocarbon is directly proportional to the thickness, and at particular points the presence of hydrocarbon layer is clearly significant.

2014 International Conference on Computer and Information Sciences (ICCOINS), 2014

ABSTRACT In this study, a Multi-Layer Perceptron Neural Network and Multiple Regression technique... more ABSTRACT In this study, a Multi-Layer Perceptron Neural Network and Multiple Regression techniques are used to estimate airwaves associated with shallow water Controlled-Source Electro-Magnetic (CSEM) data. Both techniques are appropriate for the development of estimation models. However, multiple regression models make some assumptions about the underlying data. These assumptions include independence, normality and homogeneity of variance. Conversely, neural network based models are not constrained by such assumptions. The performance of the two techniques is calculated based on coefficient of determination (R2) and mean square error (MSE). The results indicate that MLP produced better estimate for the airwaves with MSE of 0.0113 and R2 of 0.9935.

Communications in Computer and Information Science, 2014

In this research, Independent component analysis using Principal Component Analysis (ICA-PCA) tec... more In this research, Independent component analysis using Principal Component Analysis (ICA-PCA) technique has been applied in the field of seabed logging application for the filtration of airwaves. Independent component analysis (ICA) is a statistical approach for transforming data of multivariate nature into its constituent components (sources) which are considered to be statistically independent of each other. ICA-PCA is applied in the domain of marine controlled source electromagnetic (CSEM), called seabed logging (SBL) sensing method used for the detection of hydrocarbons based reservoirs in SBL application. ICA-PCA has not been applied before in SBL application, and therefore may reduce exploration costs in deep sea areas. The task is to identify the air waves and to filter them out, hence, the ICA-PCA algorithm is carried out for airwave filtration, at varying seawater depth from 100 m to 3000 m. It is observed that the results are favorable upto 2500 m depth. Upon increasing seawater depth, the component representing the presence of hydrocarbon becomes more dispersed, vague and indistinguishable.

Journal of Independent Studies and Research Computing

This paper presents a survey of 5G and suitable concerns in the planning and development of commu... more This paper presents a survey of 5G and suitable concerns in the planning and development of communication model infrastructure for the deployment of Smart Cities, also called Intelligent Cities or Digital Cities. The paper first provides an overview of 5G technology, its evolution, and how it revolutionised worldwide communication. The drivers of 5G, such as enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), and massive machine-type communication (mMTC), will enable 5G to deliver higher speeds compared to the previous 4G and 3G generations and enable service providers to provide massive bandwidth catering to dataintensive applications such as Smart Cities. Besides humancomputer interaction (HCI), smart cities include machine type communication (MTC), in which massive communication takes place between devices and the information infrastructure through gateways. A 5G network can successfully integrate the diversified service requirements and demands of smart city applications. Smart cities require massive IoT communication built into 5G. Multiple technologies are deployed in smart cities to enhance the standard of living for people. Citizens are provided with better health services, improved transportation, efficient energy, quality education, and safety and security to public. In this survey paper we present the contribution of 5G in the deployment of smart city applications and its pillars that play a very important role in the construction of smart cities. Better healthcare systems have been developed that integrate new communication technologies and conventional health care procedures. One of the vital segments of a smart city is its transportation system, which affects the environs and health of people. The energy efficiency of smart cities can be greatly improved by 5G by using smart appliances. Smart metres deliver real-time data about the energy consumed. Users can save energy and money. Similarly, it can assist the water board team by giving real-time statistics regarding water consumption to the consumers. Almost all the smart city infrastructure mentioned above has different requirements for delay, movement, dependability, and resilience of the network. Incorporating diverse applications into a communication network is a difficult chore. 5G has been designed for forward compatibility to support future amenities not known today. The paper outlines diverse requirements for smart cities based on application and technology requirements. Lastly, the supporting technologies are highlighted for the forthcoming integration of smart cities and communication infrastructure.

Design Engineering, Sep 10, 2021

Journal of Geophysics and Engineering, 2021

Controlled-source electromagnetics is a strongly efficient technique to explore deep-water marine... more Controlled-source electromagnetics is a strongly efficient technique to explore deep-water marine hydrocarbon reservoirs. However, the shallow-water unsolved limitations of electromagnetic shooting methods still exist. In this regard, this work aims to alter the existing conventional electromagnetic source such that it can converge the down-going electromagnetic wave while simultaneously dispersing the up-going electromagnetic energy to minimise the airwave in shallow water. This work presents computed electric current distribution inside a modified transmitter, using a method of moments. Simulation and an experiment-based methodology are applied to this work. Finite element simulation of the response of the modified transmitter displayed the capability of the new transmitter in dispersing the airwave, by 15%. The experimental setup confirmed a better performance of the new transmitter, showing hydrocarbon delineation of up to 48%, compared to the existing conventional transmitter, ...

2014 IEEE Asia-Pacific Conference on Applied Electromagnetics (APACE), 2014

In Marine Control Source Electromagnetic (MCSEM) method for Seabed Logging (SBL), different anten... more In Marine Control Source Electromagnetic (MCSEM) method for Seabed Logging (SBL), different antenna orientations varies the sensitivity in detecting hydrocarbon layer. Up to the recent works, double stacking of hydrocarbon sensitivity has not been addressed. In this article, first we present the challenging oil detect-ability using different orientations of the electric dipole antenna. Our simulation results prevails that the Ex field response by Horizontal Electric Dipole, in-line with receiver (HED-R), is found to be the most sensitive in detecting one hydrocarbon layer, compared to the Vertical Electric Dipole (VED) in the given conditions. Furthermore for every 50m increment of oil layer thickness, 20% of the E-field magnitude is found to be increased. For deep target oil reservior, VED antenna gives the most optimum sensitivity in detecting double stacking of hydrocarbon layer with the highest percentange difference increment of 11.21% compared to both orientations of (HED). Thus with the above contributions, this research opens new doors in the field of efficient oil detection using the respective dipole antenna orientation and challenging resistive layer detection in the offshore environment.

2010 International Symposium on Information Technology, 2010

In most instances Wireless Sensor Networks (WSNs) are confined to applications which require less... more In most instances Wireless Sensor Networks (WSNs) are confined to applications which require less security restrictions. This is because the trade-off between security and performance in WSNs is far too high. In this paper we explore the security requirements of the varied application fields of ZigBee WSNs from current to future applications with the aim of expanding the application domain,

INFORMATION TECHNOLOGY IN INDUSTRY, 2021

Wireless technology has brought a very advanced change in the field of the internet. It has given... more Wireless technology has brought a very advanced change in the field of the internet. It has given rise to many new applications. In recent years, a lot of work has been done in the field of Mobile Ad hoc Networks (MANET) which makes it so popular in the area of research work. MANET is an infrastructure-less, dynamic network that consists of a collection of wireless mobile nodes, and the communication between these nodes has been carried out without any centralized authority. There are several network performance metrics, Packet Loss and End-to-End Delay which can be taken into account, for getting a general idea about the performance of the Geographical Routing Protocol in Mobile Ad-Hoc Networks. The proposed research will evaluate the parameters which affect the communication in the Geographical Routing Protocol in Mobile Ad-Hoc Networks.

Education reform and development, Jun 20, 2024

JISR on Computing, Dec 31, 2022

Journal of critical reviews, 2020

2018 IEEE 21st International Multi-Topic Conference (INMIC), 2018

Sea Bed Logging (SBL) is a use of the marine controlled source electromagnetic (CSEM) technique t... more Sea Bed Logging (SBL) is a use of the marine controlled source electromagnetic (CSEM) technique that is utilized to recognize potential nearness of hydrocarbon by utilizing a Horizontal Electric Dipole (HED) reception apparatus. It is liable to produce EM waves and accepting them through batch of sea floor electric field receivers. This method sometime has been vastly opted to diminish the element of inaccurate mapping that leads to false drilling at locations causing massive amount of capital loss and time. Marine EM equipment development continues to be an active research and development area for both industry and academia. In order for the miniaturization of such circumstances several modifications can be made to the instrumentation for the improved and more efficient outcomes. Along with other elements involved in the process, amplifier specially has its own relevance and yet can be enhanced further for the better propagation and improved performance of transmitters. After careful calculations, the seabed model has been mimicked in lab scale tank comprising of under-burden layer, over-burden layer, hydrocarbon reservoirs and sea water. An amplifier system is designed especially for the current experimental setup. The effect was studied under application of multiple frequencies upon which various gains were also obtained. The promising response reveals that by concentrating on the amplifier system, potential oil reservoirs can be explore more efficiently.

Research Journal of Applied Sciences, Engineering and Technology, 2014

Procedia Technology, 2013

The wireless technology has been increasingly evolving in the world of healthcare applications wh... more The wireless technology has been increasingly evolving in the world of healthcare applications where the medical devices, information technology and communications have started to converge and has the potential to revolutionize. The technology of Radio Frequency Identification (RFID) has shown great promise in helping healthcare improves patient's safety and achieving efficient operation. Due to the increment of human errors and patients also the decrement of medical staff, researchers found that the RFID technology is chosen to be a suitable solution. However, the current RFID tag is seen to have several setbacks in obtaining an efficient and accurate data transfer also to support continuous data transmission. This paper discusses on the limitation and its possible solution in order to obtain better network for healthcare.

2014 International Conference on Computer and Information Sciences (ICCOINS), 2014

This research aims to apply the FASTICA and Infomax algorithm in the field of seabed logging, by ... more This research aims to apply the FASTICA and Infomax algorithm in the field of seabed logging, by utilizing the Principal Component Analysis (PCA) as preprocessor. All the three algorithms are statistical algorithms used for signal deconvolution and are respectively in the field of Independent Component Analysis (ICA). In seabed logging (SBL) implies the marine controlled source electromagnetic (CSEM) technique for the detection of hydrocarbons underneath the seabed floor. The results from SBL, indicate the presence of Hydrocarbon, but due to the presence of noise, in the form of airwaves, interfere with the signals from the subsurface and tend to dominate the receiver response. Hence, the Infomax and FASTICA de-convolution algorithms are used, considering PCA as a pre-processor to filter out the airwaves which disrupt the subsurface signals within the receiver response. The results obtained from simulations and their comparative analysis, indicate that the results from the infomax algorithm are better.

2014 International Conference on Computer and Information Sciences (ICCOINS), 2014

This paper focuses on the detection of hydrocarbon layers under the seabed using Electromagnetic ... more This paper focuses on the detection of hydrocarbon layers under the seabed using Electromagnetic methods and to prove the relationship between the thickness and resistivity constrast of the hydrocarbon. Simulations have been carried out by varying the depth of seawater from 1000m to 100m and the resistivity contrast and thickness for each level of depth is also varied. The electric field is also measured using various simulation models and graphs over different offsets. The results obtained prove that the resistivity property of Hydrocarbon is directly proportional to the thickness, and at particular points the presence of hydrocarbon layer is clearly significant.

2014 International Conference on Computer and Information Sciences (ICCOINS), 2014

ABSTRACT In this study, a Multi-Layer Perceptron Neural Network and Multiple Regression technique... more ABSTRACT In this study, a Multi-Layer Perceptron Neural Network and Multiple Regression techniques are used to estimate airwaves associated with shallow water Controlled-Source Electro-Magnetic (CSEM) data. Both techniques are appropriate for the development of estimation models. However, multiple regression models make some assumptions about the underlying data. These assumptions include independence, normality and homogeneity of variance. Conversely, neural network based models are not constrained by such assumptions. The performance of the two techniques is calculated based on coefficient of determination (R2) and mean square error (MSE). The results indicate that MLP produced better estimate for the airwaves with MSE of 0.0113 and R2 of 0.9935.

Communications in Computer and Information Science, 2014

In this research, Independent component analysis using Principal Component Analysis (ICA-PCA) tec... more In this research, Independent component analysis using Principal Component Analysis (ICA-PCA) technique has been applied in the field of seabed logging application for the filtration of airwaves. Independent component analysis (ICA) is a statistical approach for transforming data of multivariate nature into its constituent components (sources) which are considered to be statistically independent of each other. ICA-PCA is applied in the domain of marine controlled source electromagnetic (CSEM), called seabed logging (SBL) sensing method used for the detection of hydrocarbons based reservoirs in SBL application. ICA-PCA has not been applied before in SBL application, and therefore may reduce exploration costs in deep sea areas. The task is to identify the air waves and to filter them out, hence, the ICA-PCA algorithm is carried out for airwave filtration, at varying seawater depth from 100 m to 3000 m. It is observed that the results are favorable upto 2500 m depth. Upon increasing seawater depth, the component representing the presence of hydrocarbon becomes more dispersed, vague and indistinguishable.

Journal of Independent Studies and Research Computing

This paper presents a survey of 5G and suitable concerns in the planning and development of commu... more This paper presents a survey of 5G and suitable concerns in the planning and development of communication model infrastructure for the deployment of Smart Cities, also called Intelligent Cities or Digital Cities. The paper first provides an overview of 5G technology, its evolution, and how it revolutionised worldwide communication. The drivers of 5G, such as enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), and massive machine-type communication (mMTC), will enable 5G to deliver higher speeds compared to the previous 4G and 3G generations and enable service providers to provide massive bandwidth catering to dataintensive applications such as Smart Cities. Besides humancomputer interaction (HCI), smart cities include machine type communication (MTC), in which massive communication takes place between devices and the information infrastructure through gateways. A 5G network can successfully integrate the diversified service requirements and demands of smart city applications. Smart cities require massive IoT communication built into 5G. Multiple technologies are deployed in smart cities to enhance the standard of living for people. Citizens are provided with better health services, improved transportation, efficient energy, quality education, and safety and security to public. In this survey paper we present the contribution of 5G in the deployment of smart city applications and its pillars that play a very important role in the construction of smart cities. Better healthcare systems have been developed that integrate new communication technologies and conventional health care procedures. One of the vital segments of a smart city is its transportation system, which affects the environs and health of people. The energy efficiency of smart cities can be greatly improved by 5G by using smart appliances. Smart metres deliver real-time data about the energy consumed. Users can save energy and money. Similarly, it can assist the water board team by giving real-time statistics regarding water consumption to the consumers. Almost all the smart city infrastructure mentioned above has different requirements for delay, movement, dependability, and resilience of the network. Incorporating diverse applications into a communication network is a difficult chore. 5G has been designed for forward compatibility to support future amenities not known today. The paper outlines diverse requirements for smart cities based on application and technology requirements. Lastly, the supporting technologies are highlighted for the forthcoming integration of smart cities and communication infrastructure.

Design Engineering, Sep 10, 2021

Journal of Geophysics and Engineering, 2021

Controlled-source electromagnetics is a strongly efficient technique to explore deep-water marine... more Controlled-source electromagnetics is a strongly efficient technique to explore deep-water marine hydrocarbon reservoirs. However, the shallow-water unsolved limitations of electromagnetic shooting methods still exist. In this regard, this work aims to alter the existing conventional electromagnetic source such that it can converge the down-going electromagnetic wave while simultaneously dispersing the up-going electromagnetic energy to minimise the airwave in shallow water. This work presents computed electric current distribution inside a modified transmitter, using a method of moments. Simulation and an experiment-based methodology are applied to this work. Finite element simulation of the response of the modified transmitter displayed the capability of the new transmitter in dispersing the airwave, by 15%. The experimental setup confirmed a better performance of the new transmitter, showing hydrocarbon delineation of up to 48%, compared to the existing conventional transmitter, ...

2014 IEEE Asia-Pacific Conference on Applied Electromagnetics (APACE), 2014

In Marine Control Source Electromagnetic (MCSEM) method for Seabed Logging (SBL), different anten... more In Marine Control Source Electromagnetic (MCSEM) method for Seabed Logging (SBL), different antenna orientations varies the sensitivity in detecting hydrocarbon layer. Up to the recent works, double stacking of hydrocarbon sensitivity has not been addressed. In this article, first we present the challenging oil detect-ability using different orientations of the electric dipole antenna. Our simulation results prevails that the Ex field response by Horizontal Electric Dipole, in-line with receiver (HED-R), is found to be the most sensitive in detecting one hydrocarbon layer, compared to the Vertical Electric Dipole (VED) in the given conditions. Furthermore for every 50m increment of oil layer thickness, 20% of the E-field magnitude is found to be increased. For deep target oil reservior, VED antenna gives the most optimum sensitivity in detecting double stacking of hydrocarbon layer with the highest percentange difference increment of 11.21% compared to both orientations of (HED). Thus with the above contributions, this research opens new doors in the field of efficient oil detection using the respective dipole antenna orientation and challenging resistive layer detection in the offshore environment.

2010 International Symposium on Information Technology, 2010

In most instances Wireless Sensor Networks (WSNs) are confined to applications which require less... more In most instances Wireless Sensor Networks (WSNs) are confined to applications which require less security restrictions. This is because the trade-off between security and performance in WSNs is far too high. In this paper we explore the security requirements of the varied application fields of ZigBee WSNs from current to future applications with the aim of expanding the application domain,

INFORMATION TECHNOLOGY IN INDUSTRY, 2021

Wireless technology has brought a very advanced change in the field of the internet. It has given... more Wireless technology has brought a very advanced change in the field of the internet. It has given rise to many new applications. In recent years, a lot of work has been done in the field of Mobile Ad hoc Networks (MANET) which makes it so popular in the area of research work. MANET is an infrastructure-less, dynamic network that consists of a collection of wireless mobile nodes, and the communication between these nodes has been carried out without any centralized authority. There are several network performance metrics, Packet Loss and End-to-End Delay which can be taken into account, for getting a general idea about the performance of the Geographical Routing Protocol in Mobile Ad-Hoc Networks. The proposed research will evaluate the parameters which affect the communication in the Geographical Routing Protocol in Mobile Ad-Hoc Networks.