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A systematic approach in load disaggregation utilizing a multi-stage classification algorithm for consumer electrical appliances classification

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Frontiers in Energy 2019年第2期13卷 386-398页

作者： Chuan Choong YANG Chit Siang SOH Vooi Voon YAP Chuan Choong YANG (El) Chit Siang SOH Vooi Voon YAP Faculty of Engineering and Green Technology Universiti Tunku Abdul Rahman Jalan Kolej Taman Bandar Barn Kampar 31900 Perak Malaysia

The potential to save energy in existing consumer electrical appliances is very high. One of the ways to achieve energy saving and improve energy use awareness is to recognize the energy consumption of individual electrical appliances. To recognize the energy consumption of consumer electrical appliances, the load disaggregation methodology is utilized. Non-intrusive appliance load monitoring (NIALM) is a load disaggrega-tion methodology that disaggregates the sum of power consumption in a single point into the power consumption of individual electrical appliances. In this study, load disaggregation is performed through voltage and current waveform, known as the V-I trajectory. The classification algorithm performs cropping and image pyramid reduction of the V-I trajectory plot template images before utilizing the principal component analysis (PCA) and the k-nearest neighbor (k-NN) algorithm. The novelty of this paper is to establish a systematic approach of load disaggregation through V-I trajectory-based load signature images by utilizing a multi-stage classification algorithm methodol-ogy. The contribution of this paper is in utilizing the “k- value,” the number of closest data points to the nearest neighbor, in the k-NN algorithm to be effective in classification of electrical appliances. The results of the multi-stage classification algorithm implementation have been discussed and the idea on future work has also been proposed.

关键词： load disaggregation voltage-current (V-I) trajectory multi-stage classification algorithm principal component analysis (PCA) k-nearest neighbor (k-NN)

A disaggregation approach for estimating high spatial resolution broadband emissivity for bare soils from Landsat surface reflectance

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International Journal of Digital Earth 2018年第7期11卷 691-702页

作者： Jie Cheng Shunlin Liang Hao Liu Aixiu Nie Qiang Liu State Key Laboratory of Remote Sensing Science Faculty of GeographyBeijing Normal UniversityBeijingPeople’s Republic of China Department of Geographical Sciences University of MarylandCollege ParkMDUSA State Key Laboratory of Remote Sensing Science College of Global Change and Earth System ScienceBeijing Normal UniversityBeijingPeople’s Republic of China

High spatial resolution land surface broadband emissivity(BBE)is not only useful for surface energy balance studies at local scales,but also can bridge the gap between existing coarser resolution BBE products and point-based field measurements.This study proposes a disaggregation approach that utilizes the established BBE–reflectance relationship for estimating high spatial resolution BBE for bare soils from Landsat surface reflectance data.The disaggregated BBE is compared to the BBE calculated from spatial–temporal matched Advanced Spaceborne Thermal Emission and Reflectance Radiometer emissivity product.Comparison results show that better agreement is achieved over relative homogeneous areas,but deteriorated over heterogeneous and cloud-contaminated areas.In addition,field-measured emissivity data over large homogeneous desert were also used to validate the disaggregated BBE,and the bias is 0.005.The comparison and validation results indicated that the disaggregation approach can obtain high spatial resolution BBE with better accuracy for homogeneous area.

关键词： Broadband emissivity ASTER TM bare soil disaggregation

Test System for disaggregation Algorithms for use in Smart Meters

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Test System for Disaggregation Algorithms for use in Smart M...

Temporal disaggregation of Time Series Revisited

2011 2nd International Conference on Advances in Energy Engineering(ICAEE)

作者： Dirk Benyoucef Thomas Bier Philipp Klein Hochschule Furtwangen University

In this paper a test system tor verifying disaggregation aigorithms is presented.The main part of the test system is a test set generator.Based on the model of a real voltage source,the generator generates test sets.With these test sets the quality of the developed algorithms can be analyzed.These algorithms will be developed for the implementation in a smart meter.The smart meter system is used for the disaggregation of electrical appliances in residential buildings.This allows to be closed on energy consumption of the individual appliance.The development of a complete smart meter system is the goal of the research project "Smart Metering" at the University of Furtwangen.

关键词： Smart Meter Non-Intrusive Appliance Load Monitoring NALM disaggregation

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Management Studies 2019年第4期7卷 293-299页

作者： Erin M. Hodgess Kendra Mhoon Western Governors University Salt Lake CityUSA University of Houston-Downtown HoustonUSA

With the benefits of increased computing power and much improved software,temporal disaggregation is examined.disaggregation,the process of obtaining high frequency data from low frequency data has been discussed for many years.This study examines three methods which utilize the autoregressive integrated moving average(ARIMA)model in a simulation study comparing parameter estimation,disaggregation mean square error,and forecast mean square error.Finally,the three methods are applied to a real-world time series.

关键词： disaggregation aggregation ARIMA

Disaggregating population data for assessing progress of SDGs:methods and applications

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International Journal of Digital Earth 2022年第1期15卷 2-29页

作者： Yue Qiu Xuesheng Zhao Deqin Fan Songnian Li Yijing Zhao College of Geoscience and Surveying Engineering China University of Mining and Technology (Beijing)BeijingPeople’s Republic of China Department of Civil Engineering Ryerson UniversityTorontoCanada

Rapid population growth has had a significant impact on society,economy and environment,which will challenge the achievement of the United Nations Sustainable Development Goals(SDGs).Spatially accurate and detailed population distribution data are essential for measuring the impact of population growth and tracking progress on the SDGs.However,most population data are evenly distributed within administrative units,which seriously lacks spatial details.There are scale differences between the population statistical data and geospatial data,which makes data analysis and needed research difficult.The disaggregation method is an effective way to obtain the spatial distribution of population with greater granularity.It can also transform the statistical population data from irregular administrative units into regular grids to characterize the spatial distribution of the population,and the original population count is preserved.This paper summarizes the research advances of population disaggregation in terms of methodology,ancillary data,and products and discusses the role of spatial disaggregation of population statistical data in monitoring and evaluating SDG indicators.Furthermore,future work is proposed from two perspectives:challenges with spatial disaggregation and disaggregated population as an Essential SDG Variable(ESDGV).

关键词： Population disaggregation dasymetric mapping SDG indicators assessment

Distributed Real-time Temperature and Energy Control of Energy Efficient Buildings via Geothermal Heat Pumps

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CSEE Journal of Power and Energy Systems 2023年第6期9卷 2289-2300页

作者： Xiaotian Wang Lei Liang Xuan Zhang Hongbin Sun Tsinghua-Berkeley Shenzhen Institute Tsinghua UniversityShenzhenChina Department of Electrical Engineering Tsinghua UniversityBeijingChina

Geothermal heat pumps(GHPs)are a type of heating ventilation and air conditioning(HVAC)systems that use low-temperature resources from soil and groundwater for heating/cooling.In recent years,there has been an increasing interest in GHP systems due to their high energy efficiency and abundant geothermal resources.Thus,the optimization and control design of the GHP system has become a hot topic.On the other hand,as the GHP system is an ideal respon-sive load,mechanism design for the GHP system to realize demand response(DR)in a virtual power plant(VPP)without affecting user comfort is particularly essential.In this paper,we propose a distributed real-time temperature and energy management method via GHP systems for multi-buildings,where both floor and radiator heating/cooling distribution subsystems in multiple thermal zones are considered.We design an energy demand response mechanism for a single GHP to track the given energy consumption command for participating in VPP aggregation/disaggregation.Besides,a coordination mechanism for multiple GHPs is designed for the community-level oper-ator in joining VPP aggregation/disaggregation.Both designed schemes are scalable and do not need to measure or predict any exogenous disturbances such as outdoor temperature and heating disturbances from external sources,e.g.,user activity and device operation.Finally,four numerical examples for the simulation of two different scenarios demonstrate the effectiveness of the proposed methods.

关键词： Building temperature and energy management disaggregation distributed control GHP HVAC VPP

Proanthocyanidins prevent tau protein aggregation and disintegrate tau filaments

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Chinese Journal of Chemical Engineering 2023年第5期57卷 63-71页

作者： Huan-Huan Yin Yin-Lei Han Xiao Yan Yi-Xin Guan College of Chemical and Biological Engineering Zhejiang UniversityHangzhou 310027China Max Planck Institute of Molecular Cell Biology and Genetics Dresden 01307Germany

Occurrence of neurofibrillary tangles of the tau protein is a hallmark of tau-related neurodegenerative diseases, i.e. Alzheimer's disease(AD) and frontotemporal dementia. The pathological mechanism underlying AD remains poorly understood, and effective treatments are still unavailable to mitigate the disease.Inhibiting of tau aggregation and disrupting the existing fibrils are key targets in drug discovery towards preventing or curing AD. In this study, grape seed proanthocyanidins(GSPs) was found to effectively inhibit the repeat domain of tau(tau-RD) aggregation and disaggregate tau-RD fibrils in a concentrationdependent manner by inhibiting β-sheet formation of tau-RD. In cells, GSPs relieved cytotoxicity induced by tau-RD aggregates. Molecular dynamics simulations indicated that strong hydrogen bonding,hydrophobic interaction and π-π stacking between GSPs and tau-RD protein were major reasons why GSPs had high inhibitory activity on tau-RD fibrillogenesis. These results provide preliminary data to develop GSPs into medicines, foodstuffs or nutritional supplements for AD patients, suggesting that GSPs could be a candidate molecule in the drug design for AD therapeutics.

关键词： Protein Aggregation disaggregation Molecular simulation Proanthocyanidins Alzheimer’s disease(AD)

Potential of peptides and phytochemicals in attenuating different phases of islet amyloid polypeptide fi brillation for type 2 diabetes management

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Food Science and Human Wellness 2021年第3期10卷 259-269页

作者： Raliat O.Abioye Chibuike C.Udenigwe Department of Chemistry and Biomolecular Sciences Faculty of ScienceUniversity of OttawaOttawaOntarioK1N 6N5Canada School of Nutrition Sciences Faculty of Health SciencesUniversity of OttawaOttawaOntarioK1H 8M5Canada

Islet amyloid polypeptide(IAPP),or amylin,has been identifi ed as a key factor in the development of type 2 diabetes(T2D).IAPP aggregates,which form amyloid fi brils,contribute to cytotoxicity of the pancreatic β-cells,resulting in loss of function and subsequent reduction in insulin production.As a result,surviving β-cells overcompensate for this reduction of insulin production,further contributing to the loss of function because of increased stress,thus leading to insulin resistance.Endogenously,IAPP monomers function in a variety of roles;however,aggregation renders them non-functional.The use of naturally occurring compounds,including peptides and phytochemicals,has been explored as a way to mitigate or inhibit IAPP fi bril formation.This review discusses the structure,endogenous roles and mechanism of IAPP fi bril formation,recent advances on inhibitors of IAPP fi bril formation,and new insights on the future development and application of foodderived inhibitors towards T2D management.

关键词： Islet amyloid polypeptide Fibril formation disaggregation Bioactive peptides Phytochemicals

INTERACTION BETWEEN POLY (ETHYLENE OXIDE) AND SILICA NANOPARTICLES IN DILUTE SOLUTIONS

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Chinese Journal of Polymer Science 2013年第9期31卷 1290-1298页

作者： Da-peng Wang Mu-quan Yang Zhi-xin Dong Shu-qin Bo Xiang-ling Ji State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences

A mixed system that includes poly（ethylene oxide）（PEO） and silica （SiO2） nanoparticles is prepared using two mixing methods. The interaction between PEO and the SiO2 nanoparticles in the dilute basic solution is investigated using the dynamic tight scattering （DLS） and isothermal titration calorimetry （ITC） techniques. The DLS results show qualitatively that SiO2 nanoparticles interact with both random coils and aggregates of PEO through hydrogen bonding, and PEO-SiO2 complexes are formed. The degree of disaggregation of aggregates of PEO is readily adjusted by changing the concentration of SiO2 nanoparticle suspensions. Moreover, the ITC results also certify quantitatively the interaction between PEO and SiO2 nanoparticle, and give the evidence of formation of PEO-SiO2 complex.

关键词： PEO SiO2 nanoparticles Hydrogen bonding disaggregation Mixing method Depletion interaction.