Internet of Things-aided Smart Grid: Technologies, Architectures, Applications, Prototypes, and Future Research Directions

Traditional power grids are being transformed into Smart Grids (SGs) to address the issues in existing power system due to uni-directional information flow, energy wastage, growing energy demand, reliability and security. SGs offer bi-directional energy flow between service providers and consumers, involving power generation, transmission, distribution and utilization systems. SGs employ various devices for the monitoring, analysis and control of the grid, deployed at power plants, distribution centers and in consumers' premises in a very large number. Hence, an SG requires connectivity, automation and the tracking of such devices. This is achieved with the help of Internet of Things (IoT). IoT helps SG systems to support various network functions throughout the generation, transmission, distribution and consumption of energy by incorporating IoT devices (such as sensors, actuators and smart meters), as well as by providing the connectivity, automation and tracking for such devices. In this paper, we provide a comprehensive survey on IoT-aided SG systems, which includes the existing architectures, applications and prototypes of IoT-aided SG systems. This survey also highlights the open issues, challenges and future research directions for IoT-aided SG systems

A Survey on Communication Networks for Electric System Automation

Published in Computer Networks 50 (2006) 877–897, an Elsevier journal. The definitive version of this publication is available from Science Direct. Digital Object Identifier:10.1016/j.comnet.2006.01.005In today’s competitive electric utility marketplace, reliable and real-time information become the key factor for reliable delivery of power to the end-users, profitability of the electric utility and customer satisfaction. The operational and commercial demands of electric utilities require a high-performance data communication network that supports both existing functionalities and future operational requirements. In this respect, since such a communication network constitutes the core of the electric system automation applications, the design of a cost-effective and reliable network architecture is crucial. In this paper, the opportunities and challenges of a hybrid network architecture are discussed for electric system automation. More specifically, Internet based Virtual Private Networks, power line communications, satellite communications and wireless communications (wireless sensor networks, WiMAX and wireless mesh networks) are described in detail. The motivation of this paper is to provide a better understanding of the hybrid network architecture that can provide heterogeneous electric system automation application requirements. In this regard, our aim is to present a structured framework for electric utilities who plan to utilize new communication technologies for automation and hence, to make the decision making process more effective and direct.This work was supported by NEETRAC under Project #04-157

Hybrid Satellite-Terrestrial Communication Networks for the Maritime Internet of Things: Key Technologies, Opportunities, and Challenges

With the rapid development of marine activities, there has been an increasing number of maritime mobile terminals, as well as a growing demand for high-speed and ultra-reliable maritime communications to keep them connected. Traditionally, the maritime Internet of Things (IoT) is enabled by maritime satellites. However, satellites are seriously restricted by their high latency and relatively low data rate. As an alternative, shore & island-based base stations (BSs) can be built to extend the coverage of terrestrial networks using fourth-generation (4G), fifth-generation (5G), and beyond 5G services. Unmanned aerial vehicles can also be exploited to serve as aerial maritime BSs. Despite of all these approaches, there are still open issues for an efficient maritime communication network (MCN). For example, due to the complicated electromagnetic propagation environment, the limited geometrically available BS sites, and rigorous service demands from mission-critical applications, conventional communication and networking theories and methods should be tailored for maritime scenarios. Towards this end, we provide a survey on the demand for maritime communications, the state-of-the-art MCNs, and key technologies for enhancing transmission efficiency, extending network coverage, and provisioning maritime-specific services. Future challenges in developing an environment-aware, service-driven, and integrated satellite-air-ground MCN to be smart enough to utilize external auxiliary information, e.g., sea state and atmosphere conditions, are also discussed

Report on the Evaluation of EVS Usage and Trends at the University of Hertfordshire : February to June 2014

The Electronic Voting Systems (EVS) evaluation project for iTEAM has investigated the current level of engagement in the use of EVS across the institution in 2014. It has built on the work and outputs of the JISC supported Evaluating Electronic Voting Systems (EEVS) project in 2011-12 and the work of the iTEAM project through 2011-2013. It offers an up-to-date examination of the trends in EVS adoption and the breadth and nature of EVS use across the different academic schools. The project adopted a mixed-methods approach to evaluate usage and engagement. The starting point was a desk study to examine the existing data on numbers of EVS handsets purchased by academic schools in 2011, 2012 and 2013 and registered across the University and to explore the details from the School reports previously submitted to iTEAM. Sources of data included Information Hertfordshire and the iTEAM archive. Quantitative surveys were drawn up and information requests for student numbers were made to Senior Administrative Managers (SAM). A series of interviews were held with School-based academics including EVS Champions and Associate Deans for Learning and Teaching. Three purchasing trends for EVS handsets by different Schools were found:- slow decrease in HUM, LAW and PAM, moderate increase in BS, EDU and HSK and rapid increase in CS, ET and LMS. In terms of levels of EVS usage in 2013 -14 four different patterns emerged among the schools. These showed: slow increase (CS, LMS and PAM), slow decrease (BS, ET, EDU and HUM), rapid decrease (LAW) and no change (CA and HSK). The EVS purchasing and usage trends comply with the figures given by Rogers for his technology adoption model. Some schools are characterised by successful ongoing EVS use over several years while other school strategies for EVS, which had showed promise early on, have faltered in their use. There was some evidence that academics in STEMM subjects are more likely to engage willingly with EVS use where larger groups are taught, but this is not yet in evidence across all the STEMM groups at this university. Furthermore good practice exists and flourishes across non-STEMM subjects as well. The strategies for successful School-based EVS embedding and continued use include the following three hallmarks:- •Top-down management support for purchasing of handsets and including training for academics and administrators, and alignment with the School teaching and learning strategy. •The existence of a core of innovators and early adopters of technology including the local EVS champions, who are willing to actively engage with their fellow colleagues in sharing the potential of EVS technology. •An engagement with the pedagogical implications for changing and developing practice that the greater use of formative or summative polling and questioning requires. The immediate future of classroom technologies such as EVS offers two main directions. Firstly, there is the continuation of adopting ‘institutionally provided’ handheld devices. This is a low-cost method that can be used easily and flexibly. The other options for classroom polling rely on sufficient wifi availability in the teaching rooms and/or mobile phone signal strength/network availability and capacity. It is anticipated that the capacity issue will present fewer barriers for adoption in future, and that the future of the classroom response systems is inevitably linked to the widespread use of mobile technologies by students