Journal of Digital Food, Energy & Water Systems https://journals.uj.ac.za/index.php/DigitalFoodEnergy_WaterSystems <p>The&nbsp;<strong>Journal of Digital Food, Energy &amp; Water Systems (JD-FEWS)</strong>&nbsp;is a peer reviewed bi-annual publication that publishes recent and innovative deployment of emerging digital technologies in Food, Energy and Water Systems. Food, energy and water resources are interconnected scarce resources that require&nbsp;systems and technologies that will foster their sustainable management and effective utilization. The journal is also interested in articles that explore the nexus between at least two of these resources. The journal considers the following topics as long as they are deployed in the Food, Energy &amp; Water space:</p> <ul> <li class="show">Advanced Metering Infrastructure (AMI)</li> <li class="show">Algorithm development</li> <li class="show">Artificial Intelligence</li> <li class="show">Blockchain and distributed ledger technology</li> <li class="show">Case studies</li> <li class="show">Cybersecurity</li> <li class="show">Data mining &amp; Big data&nbsp;</li> <li class="show">Human-Computer Interaction</li> <li class="show">Intelligent Forecasting</li> <li class="show">Internet of Things</li> <li class="show">Machine Learning</li> <li class="show">Mathematical Optimization</li> <li class="show">Robotics</li> <li class="show">System architectures</li> <li class="show">Wireless Sensor Networks&nbsp;</li> </ul> University of Johannesburg en-US Journal of Digital Food, Energy & Water Systems 2709-4510 Design and Implementation of a Quadcopter Based on a Linear Quadratic Regulator (LQR) https://journals.uj.ac.za/index.php/DigitalFoodEnergy_WaterSystems/article/view/409 <p>This paper presents the design and construction and control of a quadcopter drone for Aerial Data Collection (ADC). The frame of the drone was designed using CadDian Software and the parts were printed using a 3D printer. The flight controller was based on Arduino board using an Atmega328p microprocessor with GSM, GPS and GPRS for sending data over the internet and also enhancing long range flight. A feedback control system was developed and tested to control the stability of drone. The proposed control strategy of the drone was tested for a case of pursuit of trajectory and also for speed of response and the findings were very positive confirming the appropriateness of the control measures for independent and autonomous flying with promising precision. This Unmanned Aerial Vehicle (UAV) fitted with IoT has the capability of collecting and sending data over the internet and therefore can be used in many applications including risk assessment, forestry management, urban planning, coastal zone management, infrastructure monitoring, post-disaster damage assessment and delivery of medical supplies.</p> Amevi Acakpovi Fran├žois-Xavier Fifatin Maurel Aza-Gnandji Fran├žois Kpadevi Justice Nyarko Copyright (c) 2020 Journal of Digital Food, Energy & Water Systems 2020-12-31 2020-12-31 1 1 10.36615/digitalfoodenergywatersystems.v1i1.409 Fuzzy Axiomatic Approach to Blue-green Infrastructure Strategy Selection: A Sustainability Perspective https://journals.uj.ac.za/index.php/DigitalFoodEnergy_WaterSystems/article/view/310 <p>Flood management is a global problem that has created immense contributions from researchers and practitioners, especially those in developing countries. These people often seek ways to minimise the aftermath of a flood. Recently, they are making a case for sustainable solutions to flood management. This study, therefore, contributes a sustainability model that addresses the problem of blue-green technology selection to the current discussion on flood management. It coupled the techno-economic, social, and environmental impact of a blue-green technology using the unique attributions of three multi-criteria decision-making tools: best-worst method, fuzzy axiomatic method and VIKOR; its performance was investigated with qualitative data sets that were obtained from experts. The outcomes of the investigation showed that techno-economic criteria contributed about 88.18% to the ranking of blue-green technology. The most and least suitable blue-green technologies for a community in Nigeria are Rainwater and floodwater harvesting and Retention lake, respectively. With these results, the proposed model will aid decision-makers strategic and tactical criteria that can be used to evaluate blue-green technology selection.</p> Desmond Ighravwe Daniel Mashao Copyright (c) 2020 Journal of Digital Food, Energy & Water Systems 2020-12-31 2020-12-31 1 1 10.36615/digitalfoodenergywatersystems.v1i1.310 Status of water security in inland South African cities https://journals.uj.ac.za/index.php/DigitalFoodEnergy_WaterSystems/article/view/411 <p>Most cities in South Africa are in dire need of water security. Intervention measures to reduce the risk of water shortages now and the near future are urgently needed. This can possibly be attained through the diversification of water sources and the application of smart or digital technologies to reduce water wastage.&nbsp; Meaning that, cities which are at risk of water scarcity may consider a variety of alternative means, which includes smart technologies and efficient use of recycled water to meet the ever-increasing demand.&nbsp; In this study the status of water security and sanitation in two inland cities (i.e. Mbombela (Nelspruit) and Polokwane (Pietersburg)) was investigated.&nbsp; A gap between supply and demand for water to households was found to be large. The primary demand for water derives from households that are connected to the municipal reticulation system and used for drinking and sanitation.&nbsp; Water security concerns were found to be from households in need of water supply and unmeasured demands from informal settlements that are illegally connected to the system. The uncertain nature of water availability due to climate change meant that the risk of water insecurity in studied cities was high. To ameliorate this, municipalities need to adopt new ways of managing water.&nbsp; This may include the use of digital technologies and the promotion of harvesting rainwater as an alternative source.&nbsp; Maintenance of existing infrastructure is highly recommended to improve efficiencies in water usage.&nbsp; Overall, results reflect the high risk of water security in Mbombela and Polokwane. Of great concern is the need to manage water to improve the efficiency of its use to meet the ever-increasing demand.</p> Thokozani Simelane Claudious Chikozho Shingirirai Sevious Mutanga Lavhelesani Rodney Managa Fhulufelo Tshililo Thandeka Dabata Copyright (c) 2020 Journal of Digital Food, Energy & Water Systems 2020-12-31 2020-12-31 1 1 10.36615/digitalfoodenergywatersystems.v1i1.411 Towards the Development of a Mobile Agriculture System for Poms Poultry Farm (PPF), Oyarifa-Accra, Ghana https://journals.uj.ac.za/index.php/DigitalFoodEnergy_WaterSystems/article/view/410 <p>This paper seeks to propose the implementation of a mobile agriculture (m-agriculture) system for Poms Poultry Farm (PPF) to solve problems such as low patronage of farm products and customer relationship management among farmers and customers. To corroborate the successful implementation of an m-agriculture system at PPF, we employed a questionnaire research instrument concerning the Technology Acceptance Model (TAM) model as a theoretical framework. Closed-ended questionnaires were administered to a sample size of 130 PPF customers. Based on the responses received, we established optimistic responses towards technological acceptance which paved the way for us to propose and develop a suitable m-agriculture application for PPF. It is envisaged that successful implementation of our proposed system will practically increase productivity and help PPF reach out to their target customers.</p> Nana Yaw Asabere Amevi Acakpovi Vida Kumiwaa Owusu Jerry Abudu Attah Eugene Kyeremateng Opoku Copyright (c) 2020 Journal of Digital Food, Energy & Water Systems 2020-12-31 2020-12-31 1 1 10.36615/digitalfoodenergywatersystems.v1i1.410