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Multi-Step Clustering of Smart Meters Time Series:Application to Demand Flexibility Characterization of SME Customers

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Computer Modeling in Engineering & Sciences 2025年第1期142卷 869-907页

作者： Santiago bañales Raquel Dormido Natividad Duro Department of Computer Sciences and Automatic Control Universidad Nacional de Educación a Distancia(UNED)Madrid28040Spain Iberdrola Innovation Middle East Doha210177Qatar

Customer segmentation according to load-shape profiles using smart meter data is an increasingly important application to vital the planning and operation of energy systems and to enable citizens’participation in the energy *** study proposes an innovative multi-step clustering procedure to segment customers based on load-shape patterns at the daily and intra-daily time *** meter data is split between daily and hourly normalized time series to assess monthly,weekly,daily,and hourly seasonality patterns *** dimensionality reduction implicit in the splitting allows a direct approach to clustering raw daily energy time series *** intraday clustering procedure sequentially identifies representative hourly day-unit profiles for each customer and the entire *** the first time,a step function approach is applied to reduce time series *** attributes embedded in surveys are employed to build external clustering validation metrics using Cramer’s V correlation factors and to identify statistically significant determinants of load-shape in energy *** addition,a time series features engineering approach is used to extract 16 relevant demand flexibility indicators that characterize customers and corresponding clusters along four different axes:available Energy(E),Temporal patterns(T),Consistency(C),and Variability(V).The methodology is implemented on a real-world electricity consumption dataset of 325 Small and Medium-sized Enterprise(SME)customers,identifying 4 daily and 6 hourly easy-to-interpret,well-defined *** application of the methodology includes selecting key parameters via grid search and a thorough comparison of clustering distances and methods to ensure the robustness of the *** research can test the scalability of the methodology to larger datasets from various customer segments(households and large commercial)and locations with different weather and socioeconomic conditio

关键词： Electric load clustering load profiling smart meters machine learning data mining demand flexibility demand response

baF Complex Is Closely Related to and Interacts with NF1/CTF and RNA Polymerase Ⅱ in Gene Transcriptional Activation

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Acta Biochimica et Biophysica Sinica 2005年第7期37卷 440-446页

作者： Li-Hui ZHAO~(1,2) Xue-Qing ba~1 Xiao-Guang WANG~3 Xiao-Juan ZHU~1 Li WANG~1 Xian-Lu ZENG~1 1 Institute of Genetics and Cytology,Northeast Normal University,Changchun 130024,China 2 College of Agronomy,Jilin Agricultural University,Changchun 130118,China 3 Department of Biology,Changchun Normal College,Changchun 130032,China Institute of Genetics and Cytology Northeast Normal UniversityChangchun 130024 China College of Agronomy Jilin Agricultural UniversityChangchun 130118 China Department of Biology Changchun Normal CollegeChangchun 130032 China

Brg-or hBrm-associated factor (baF) complexes,a chromatin-remodeling complex family ofmammalian cells,facilitate transcriptional activity by remodeling nucleosome ***1 is the coresubunit of Brg-associated factor *** the present study,we investigated the spatial relationshipbetween Brg1 and nuclear factor 1 (NF1/CTF) and RNA polymerase Ⅱ (RNAP Ⅱ) upon gene transcriptionalactivation in vivo by employing immuno-gold *** data showed that Brg1 was closely co-localizedwith NF1/CTF and RNAP Ⅱ in HeLa ***,the co-immunoprecipitation assay further revealedthat Brg1 can be isolated together with NF1/CTF and RNAP Ⅱ in the ConA-stimulated,but not the resting,T *** combined results suggested that baF complexes can interact with NF1/CTF and RNAPⅡ,and this interaction is closely dependent on the activation of gene transcription.

关键词： baF complex NF1/CTF RNAP Ⅱ gene transcription

An analysis of seismic attenuation in random porous media

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Science China(Physics,Mechanics & Astronomy) 2010年第4期53卷 628-637页

作者： LIU Jiong1, ba Jing2, MA JianWei1 & YANG HuiZhu1 1 Institute of Seismic Exploration, School of Aerospace, Tsinghua University, Beijing 100084, China 2 Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China Institute of Seismic Exploration School of Aerospace Tsinghua University Beijing China Research Institute of Petroleum Exploration & Development PetroChina Beijing China

The attenuation of seismic wave in rocks has been one of the interesting research topics, but till now no poroelasticity models can thoroughly explain the strong attenuation of wave in rocks. In this paper, a random porous medium model is designed to study the law of wave propagation in complex rocks based on the theory of Biot poroelasticity and the general theory of stochastic process. This model sets the density of grain, porosity, permeability and modulus of frame as random parameters in space, and only one fluid infiltrates in rocks for the sake of better simulation effect in line with real rocks in earth strata. Numerical simulations are implemented. Two different inverse quality factors of fast P-wave are obtained by different methods to assess attenuation through records of virtual detectors in wave field (One is amplitude decay method in time domain and the other is spectral ratio method in frequency domain). Comparing the attenuation results of random porous medium with those of homogeneous porous medium, we conclude that the attenuation of seismic wave of homogeneous porous medium is far weaker than that of random porous medium. In random porous media, the higher heterogeneous level is, the stronger the attenuation becomes, and when heterogeneity σ = 0.15 in simulation, the attenuation result is consistent with that by actual observation. Since the central frequency (50 Hz) of source in numerical simulation is in earthquake band, the numerical results prove that heterogeneous porous structure is one of the important factors causing strong attenuation in real stratum at intermediate and low frequency.

关键词： the theory of stochastic process the theory of Biot poroelasticity the attenuation of seismic wave inverse quality factor

Quantitative Transcript Analysis in Plants:Improved First-strand cDNA Synthesis

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Acta Biochimica et Biophysica Sinica 2005年第6期37卷 429-434页

作者： Nai-Zhong XIAO~1 Lei ba~1 Preben bach HOLM~2 Xing-Zhi WANG~1 Steve BOWRA~2 1 School of Life Sciences. Northeast Normal University, Chongchun 130024, China 2 Department of Plant Biology Research Centre Flakkebjerg Danish Institute of Agricultural Science, DK-4200 Slagelse Denmark School of Life Sciences Northeast Normal UniversityChangchun 130024 China Department of Plant Biology Research Centre Flakkebjerg Danish Institute of Agricultural SciencesDK-4200 Slagelse Denmark

The quantity and quality of first-strand cDNA directly influence the accuracy of transcriptionalanalysis and *** a plant-derived α-tubulin as a model system,the effect of oligo sequenceand DTT on the quality and quantity of first-strand cDNA synthesis was assessed via a combination ofsemi-quantitative PCR and real-time *** results indicated that anchored oligo dT significantly improvedthe quantity and quality of α-tubulin cDNA compared to the conventional oligo ***,omitting DTTfrom the first-strand cDNA synthesis also enhanced the levels of *** is the first time that acomparative analysis has been undertaken for a plant system and it shows conclusively that small changesto current protocols can have very significant impact on transcript analysis.

关键词： cDNA real-time PCR RT-PCR transcript analysis

Nonlinear quantum interferometry with Bose condensed atoms

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Frontiers of physics 2012年第1期7卷 109-130页

作者： Chaohong Lee (1) Jiahao Huang (1) Haiming Deng (1) Hui Dai (1) Jun Xu (1) 1. State Key Laboratory of Optoelectronic Materials and Technologies School of Physics and Engineering Sun Yat-Sen University Guangzhou 510275 China

In quantum interferometry, it is vital to control and utilize nonlinear interactions for the achievement of high-precision measurements. Due to their long coherence time and high controllability, ultracold atoms including Bose condensed atoms have been widely used for quantum interferometry. Here, we review recent progress in theoretical studies of quantum interferometry with Bose condensed atoms. In particular, we focus on nonlinear phenomena induced by atom-atom interactions, and how to control and utilize these nonlinear phenomena. With a mean-field description, due to atom-atom interactions, matter-wave solitons appear in the interference patterns, and macroscopic quantum self-trapping exists in Bose-Josephson junctions. With a many-body description, atom-atom in- teractions can generate non-classical entanglement, which can be utilized to achieve high-precision measurements beyond the standard quantum limit.

关键词： nonlinear quantum interferometry Bose Einstein condensate Bose-Josephson junction

Semi-solid Processing of Steel-Al-7 Graphite Binding Plate

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Journal of Wuhan University of Technology(Materials Science) 2002年第3期17卷 46-49页

作者：张鹏 NorthrnJiaotongUniversity

The bonding of steel plate to Al 7graphite slurry was studied for the first time. The relationship model about preheat temperature of steel plate,solid fraction of Al 7graphite slurry, rolling speed and interfacial shear strength of bonding plate could be established by artificial neural networks *** model could be optimized with a genetic *** optimum bonding parameters are:516℃ for preheat temperature of steel plate,32.5% for solid fraction of Al 7graphite slurry and 12mm/s for rolling speed,and the largest interfacial shear strength of bonding plate is 70.6MPa.

关键词： bonding of steel plate to Al 7graphite slurry artificial neural networks genetic algorithm

Abstraction for model checking multi-agent systems

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Frontiers of Computer Science 2011年第1期5卷 14-25页

作者： Conghua Zhou (1) chzhou@*** Bo Sun (1) Zhifeng Liu (1) Jiangsu Univ Sch Comp Sci & Telecommun Engn Zhenjiang 212013 Peoples R China

Model checking multi-agent systems （MAS） always suffers from the state explosion problem. In this paper we focus on an abstraction technique which is one of the major methods for overcoming this problem. For a multi-agent system, we present a novel abstraction procedure which reduces the state space by collapsing the global states in the system. The abstraction is automatically computed according to the property to be verified. The resulting abstract system simulates the concrete system, while the universal temporal epistemic properties are preserved. Our abstraction is an over-approximation. If some universal temporal epistemic property is not satisfied, then we need to identify spurious counterexamples. We further show how to reduce complex counterexamples to simple structures, i.e., paths and loops, such that the counterexamples can be checked and the abstraction can be refined efficiently. Finally, we illustrate the abstraction technique with a card game.

关键词： model checking abstraction refinement,epistemic temporal logic

Coupling measurement and correction at the SSRF storage ring

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Science China(Physics,Mechanics & Astronomy) 2011年第S2期54卷 201-206页

作者： ManZhou Zhang (1) Jie Hou (1) HaoHu Li (1) 1. Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201204 China

Brightness is an important parameter for 3rd generation light source. Correcting the emittance coupling is a realistic way to increase brightness without any additional equipment in a machine under operation. The main sources of emittance coupling are betatron coupling and vertical dispersion. At the SSRF storage ring, tune split and LOCO are used to measure the respective betatron and emittance coupling. Both of these sources can be corrected by skew quadrupoles. By measuring the skew quadrupole-coupling response matrix, betatron coupling can be changed from 0.014% to 2%. But the vertical dispersion changes at the same time. LOCO can find the suitable setting to correct simultaneously the betatron coupling and vertical dispersion. The emittance coupling can be reduced to 0.17% by this method. More simulations show the potential for smaller emittance coupling if more skew quadrupoles are employed.

关键词： emittance coupling betatron coupling vertical dispersion tune split LOCO

Effects of histone deacetylase inhibitors on transcriptional regulation of the hsp70 gene in Drosophila

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Cell Research 2006年第6期16卷 566-576页

作者： Yan Mei Zhao~(1,*) Xia Chen~(1,*) Hui Sun~1 Zhi Gen Yuan~1 Guo Ling Ren~1 Xiao Xue Li~1 Jun Lu~1 bai Qu Huang~1 ~1The Institute of Genetics and The Institute of Genetics and Cytology Northeast Normal University Changchun China

Histone acetyltransferases/deacetylases contribute to the activation or inactivation of transcription by modifying thestructure of *** we examined the effects of histone deacetylase inhibitors(HDIs),trichostatin A,and sodiumbutyrate on hsp 70 gene transcriptional regulation in *** chromatin immunoprecipitation assays revealedthat HDI treatments induced the hyperacetylation of histone H3 at the promoter and the transcribing regions of hsp70gene,increased the accessibility of heat-shock factor to target heat-shock element,and promoted the RNA polymeraseⅡ-mediated ***,the quantitative real-time PCR confirmed that the HDI-induced hyperacetylation ofhistone H3 enhanced both the basal and the inducible expression of hsp70 mRNA *** addition,the acetylation levelof histone H3 at the promoter exhibited a fluctuated change upon the time of heat *** experimental data impli-cated a causal link between histone acetylation and enhanced transcription initiation of hsp70 gene in Drosophila.

关键词： histone acetylation hsp70 histone deacetylase inhibitor Drosophila melanogaster