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Nowadays, renewable energy plays an important role in our daily lives. This Special Issue addresses the current trend in the use of renewable energy in South Korea. The first aspect is a renewable-based power system, where both main and ancillary supplies are sourced from renewable energies; the second aspect is a distribution network for renewable energy; and the last aspect is a nanogrid network technology. Renewable energy requires many innovations over existing power infrastructure and regulation. These articles show the changing trend in various sectors in Korea.

Research & information: general --- Physics --- nature-inspired optimization --- root tree algorithm (RTO) --- time multiplier setting (TMS) --- overcurrent relay (OCR) --- protection scheme --- eco-friendly --- renewable energy --- energy subsidies --- SEMS --- South Korea --- design prototype --- toilet design --- collaboration with scientists --- interdisciplinary convergence --- natural resource --- feces --- optimal design --- photovoltaic system --- renewables --- residential building --- renewable portfolio standard --- renewable energy certificate --- wind farm --- energy storage system --- variation criteria --- mixed integer linear programming --- frequency regulation --- economic benefits --- price forecast --- electricity market operation --- bi-level optimization model --- cooperation --- distributed energy resource --- distribution network --- energy band --- microgrid --- modified non-dominated sorting genetic algorithm II --- demand response --- demand-side management solution --- electricity market --- energy management --- n/a

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Artificial intelligence (AI) is a subject garnering increasing attention in both academia and the industry today. The understanding is that AI-enhanced methods and techniques create a variety of opportunities related to improving basic and advanced business functions, including production processes, logistics, financial management and others. As this collection demonstrates, AI-enhanced tools and methods tend to offer more precise results in the fields of engineering, financial accounting, tourism, air-pollution management and many more. The objective of this collection is to bring these topics together to offer the reader a useful primer on how AI-enhanced tools and applications can be of use in today’s world. In the context of the frequently fearful, skeptical and emotion-laden debates on AI and its value added, this volume promotes a positive perspective on AI and its impact on society. AI is a part of a broader ecosystem of sophisticated tools, techniques and technologies, and therefore, it is not immune to developments in that ecosystem. It is thus imperative that inter- and multidisciplinary research on AI and its ecosystem is encouraged. This collection contributes to that.

data mining --- decision-making system --- rough set --- mixed integer linear programming --- assembly clearance --- diesel engine quality --- Internet of things --- Wireless nodes --- Hybrid clustering --- Multi-hop routing --- Network lifetime --- Artificial intelligence --- data envelopment analysis --- decision making --- artificial intelligence --- performance --- visual analytics --- system --- air quality --- spatiotemporal --- multivariate --- dimension reduction --- clustering --- regular patterns --- anomalies --- speech recognition --- Long Short Term Memory (LSTM) --- speech output correction --- most-matching --- empirical correlations --- rheological properties --- real-time --- water-based drill-in fluid --- artificial neural network --- elastic parameters --- Poisson’s ratio --- sandstone --- self-adaptive differential evolution --- total organic carbon --- barnett shale --- devonian shale --- fishbone multilateral wells --- predictive models --- well productivity --- international research --- knowledge map visualization --- policy documents quantification --- research hotspot --- policy keyword --- minimum miscibility pressure (MMP) --- CO2 flooding --- new models --- face recognition --- security --- spoofing --- histogram of oriented gradients --- smart cities --- deep learning --- LSTM --- neural networks --- location prediction --- trajectories --- smart tourism --- static Young’s modulus --- sandstone formations --- machine learning --- n/a --- Poisson's ratio --- static Young's modulus

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Buildings account for more than one-third of the global final energy consumption and CO2 emissions. The building sector offers a significant potential in the transition towards the decarbonisation of societies. To achieve this goal, different concepts and implementations of Net-Zero/Positive Energy Buildings and Districts (NZPEBD) have emerged in the last years and are still in progress. This book is the collection of the articles published in the Special Issue “Net-Zero/Positive Energy Buildings and Districts” of the Buildings journal. This reprint includes 17 research articles covering different aspects of Net-Zero/Positive Energy Buildings and Districts planning, technologies, economics, building design and retrofitting, citizen engagement, and collection of energy data.

energy storage --- hydrogen --- power-to-gas --- reversible solid oxide cell --- optimization --- mixed integer linear programming --- MILP --- microgrid --- PV --- peer to peer --- self-consumption --- energy community --- local market --- PVT --- water-based PVT --- techno-economic analysis --- digital mapping --- seasonal thermal energy storage --- waste incineration --- district heating --- waste heat --- energy retrofit --- heat pump --- CO2 emissions --- building stock --- PED --- energy flexibility --- socioeconomic analysis --- regions --- regulation --- renewable energy --- urban environment --- climatic zones --- gaussian mixture model --- Expectation-Maximization --- urban building energy modeling --- data acquisition --- building optimisation design --- Saharan --- cool climate --- genetic algorithm --- low energy buildings --- spatial --- temporal --- energy use --- smart city --- net‐ and nearly‐zero‐energy buildings --- positive energy communities and districts --- renewable energy integration --- energy flexibility in buildings and communities --- simulation and optimization methods --- practical experience from demo sites --- buildings --- construction --- efficient homes --- energy efficiency --- GHG emissions --- homes --- net-zero energy (NZE) --- NZE building technology --- positive energy districts --- citizen --- cities --- participation --- citizen engagement --- stakeholder engagement --- urban energy transition --- bi-directional grid --- urban photovoltaic systems --- energy communities --- agent based modelling --- techno-economic modelling --- market design --- distributed renewable energy --- characterization --- review --- text mining --- nearly zero-energy building --- container building --- building design --- energy simulation --- climate study --- plus energy buildings --- plus energy districts --- energy sharing --- energy trading --- clean energy package --- n/a

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The depletion of natural energy resources provides evidential adverse impacts on world economy functionality. The strong requirement of a sustainable energy supply has escalated intensive research and the discovery of cleaner energy sources, as well as efficient energy management practices. In the context of a circular economy, this research not only targets the optimisation of resources utilisation at different stages but also emphasises the eco-design of products to extend production life spans. Based on this concept, this book discusses the roles of process integration approaches, renewable energy sources utilisation and design modifications in addressing the process energy and exergy efficiency improvement. The primary focus is to enhance the economic and environmental performance through process analysis, modelling and optimisation. The articles mainly show the contribution of each aspect: (a) design and numerical study for innovative energy-efficient technologies, (b) process integration—heat and power, (c) process energy efficiency or emission analysis, and (d) optimisation of renewable energy resources’ supply chain. The articles are based on the latest contribution of this journal’s Special Issues in the 21st conference entitled “Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (PRES)”. This book is complemented with an editorial review to highlight the broader state-of-the-art development.

particulate matter --- fine particles --- combustion particles --- nucleation --- particle growth --- data envelopment analysis --- energy efficiency --- food loss and waste --- life-cycle assessment --- welding residual stress --- welding deflection --- T-joint fillet weld --- preheat temperature --- interpass time --- finite element analysis --- water desalination --- water supply --- water shortage --- energy demand --- environmental impacts --- specific energy consumption --- cryogenic energy storage --- air liquefaction --- exergy analysis --- economic analysis --- exergoeconomic analysis --- heat exchanger network --- structural controllability --- structural observability --- operability --- network science --- sensor and actuator placement --- simplified methods --- design procedure --- convection section --- radiant section --- flow distribution --- heat flux distribution --- boiler --- solar collector network --- minimum number of solar collectors --- maximum operating time --- flexible operation --- district heating --- heat accumulation --- pipe --- numerical model --- Modelica language --- Julia language --- performance --- off-grid polygeneration --- micro-hydropower plant --- fuzzy optimization --- mixed-integer linear programming --- dual-turbine --- multi-objective --- heat exchanger network (HEN) --- synthesis --- optimization --- direct heat integration --- indirect heat integration --- piping --- pumping --- impinging jet --- dimple --- Nusselt number --- heat transfer --- heat exchanger --- flow boiling --- surface-enhanced tube --- heat transfer coefficient --- flow pattern --- total site heat integration --- heat recovery loop (HRL) --- heat storage --- Monte Carlo (MC) simulation --- data farming --- gasification --- biomass --- total solid particle --- trigeneration system --- process integration --- pinch analysis --- co-generation --- storage system --- trigeneration system cascade analysis --- energy conservation --- latent heat thermal energy storage --- phase change materials --- passive cooling --- bio-adsorbents --- chitosan microbeads --- nanoparticles --- anaerobic digestion --- biowaste --- life cycle assessment --- smart city --- waste collection --- P-Graph framework --- process network synthesis --- multi-periodic model --- sustainability --- co-firing --- wheat straw --- softwood --- bog peat --- pellets --- thermal decomposition --- combustion --- DC electric field --- computational fluid dynamics --- temperature contour --- cooling system --- mathematical optimization --- machine learning --- flexible control technology --- biomass co-firing --- biomass quality --- network optimization --- goal programming --- mixed integer nonlinear programming --- renewable energy sources --- energy-saving technologies