@article{christidis_sikeridis_wang_devetsikiotis_2021, title={A framework for designing and evaluating realistic blockchain-based local energy markets}, volume={281}, ISSN={["1872-9118"]}, DOI={10.1016/j.apenergy.2020.115963}, abstractNote={A growing customer base for solar-plus-storage at the grid edge has resulted in stronger interest at the regulatory level towards energy markets at the distribution level. Local energy markets (LEMs) running on blockchains are being studied as a possible direction, but the relevant literature treats the blockchain component as a black box. We make the case that this approach is flawed because the choices in this layer affect the market’s performance significantly. We explicitly identify the design space that the blockchain layer introduces, and analyze how the design choices made therein affect the performance, governance, and degree of decentralization of these markets. As an exercise, we consider three distinct configurations for a next-generation LEM, and compare their performance on both the blockchain and the market layer via a case study. We demonstrate that simple changes in the data model can decrease the market efficiency by up to 90%. We also show that changes in the way bids get encrypted may result in economic improvements, but they do so at the risk of subverting the proper operation and resilience of the market. The simulations for our case study are conducted via a framework that we developed and open-sourced as part of this work.}, journal={APPLIED ENERGY}, author={Christidis, Konstantinos and Sikeridis, Dimitrios and Wang, Yun and Devetsikiotis, Michael}, year={2021}, month={Jan} }
 @article{christidis_devetsikiotis_2016, title={Adaptive multi-tiered resource allocation policy for microgrids}, volume={4}, ISSN={["2333-8334"]}, DOI={10.3934/energy.2016.2.300}, abstractNote={We consider a cluster of buildings within proximity that share a large-capacity battery for peak-shaving purposes, and draw power from the grid at a premium once they reach a certain threshold. Our goal is to identify a resource allocation policy that minimizes the amount of energy the cluster draws at a premium, while also ensuring fair access to all of its members. We introduce an adaptive policy that allows for maximum energy savings when the network load is low, and ensures fairness when the aggregate power level is high. We compare this adaptive policy with two standard resource allocation strategies with complementary advantages, and demonstrate through an extensive performance evaluation, that it combines the benefits of both. It is therefore suitable for a microgrid operator where equal weight is given to both cluster-wide cost minimization and fairness among all customers.}, number={2}, journal={AIMS ENERGY}, author={Christidis, Konstantinos and Devetsikiotis, Michael}, year={2016}, pages={300–312} }
 @article{christidis_devetsikiotis_2016, title={Blockchains and smart contracts for the internet of things}, volume={4}, DOI={10.1109/access.2016.2566339}, abstractNote={Motivated by the recent explosion of interest around blockchains, we examine whether they make a good fit for the Internet of Things (IoT) sector. Blockchains allow us to have a distributed peer-to-peer network where non-trusting members can interact with each other without a trusted intermediary, in a verifiable manner. We review how this mechanism works and also look into smart contracts-scripts that reside on the blockchain that allow for the automation of multi-step processes. We then move into the IoT domain, and describe how a blockchain-IoT combination: 1) facilitates the sharing of services and resources leading to the creation of a marketplace of services between devices and 2) allows us to automate in a cryptographically verifiable manner several existing, time-consuming workflows. We also point out certain issues that should be considered before the deployment of a blockchain network in an IoT setting: from transactional privacy to the expected value of the digitized assets traded on the network. Wherever applicable, we identify solutions and workarounds. Our conclusion is that the blockchain-IoT combination is powerful and can cause significant transformations across several industries, paving the way for new business models and novel, distributed applications.}, journal={IEEE Access}, author={Christidis, K. and Devetsikiotis, M.}, year={2016}, pages={2292–2303} }
 @misc{zafari_papapanagiotou_christidis_2016, title={Microlocation for Internet-of-Things-Equipped Smart Buildings}, volume={3}, ISSN={["2327-4662"]}, DOI={10.1109/jiot.2015.2442956}, abstractNote={Microlocation is the process of locating any entity with a very high accuracy (possibly in centimeters), whereas geofencing is the process of creating a virtual fence around a point of interest (PoI). In this paper, we present an insight into various microlocation enabling technologies, techniques, and services. We also discuss how they can accelerate the incorporation of Internet of Things (IoT) in smart buildings. We argue that micro-location-based location aware solutions can play a significant role in facilitating the tenants of an IoT-equipped smart building. Also, such advanced technologies will enable the smart building control system through minimal actions performed by the tenants. We also highlight the existing and envisioned services to be provided by using microlocation enabling technologies. We describe the challenges and propose some potential solutions, such that microlocation enabling technologies and services are thoroughly integrated with IoT-equipped smart building.}, number={1}, journal={IEEE INTERNET OF THINGS JOURNAL}, author={Zafari, Faheem and Papapanagiotou, Ioannis and Christidis, Konstantinos}, year={2016}, month={Feb}, pages={96–112} }