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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 ba.a.es 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

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A group priority earliest deadline first scheduling algorithm

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Frontiers of Computer Science 2012年第5期6卷 560-567页

作者： Qi LI Wei ba School of Control Science and Engineering Dalian University of TechnologyDalian 116024China Science and Technology on Underwater Test and Control Laboratory Dalian 116013China

In most priority scheduling algorithms, the num- ber of priority levels is assumed to be unlimited. However, if a task set requires more priority levels than the system can support, several jobs must in practice be assigned the same priority level. To solve this problem, a novel group priority earliest deadline first （GPEDF） scheduling algorithm is pre- sented. In this algorithm, a schedulability test is given to form a job group, in which the jobs can arbitrarily change their or- der without reducing the schedulability. We consider jobs in the group having the same priority level and use shortest job first （SJF） to schedule the jobs in the group to improve the performance of the system. Compared with earliest deadline first （EDF）, best effort （BE）, and group-EDF （gEDF）, simu- lation results show that the new algorithm exhibits the least switching, the shortest average response time, and the fewest required priority levels. It also has a higher success ratio than both EDF and gEDF.

关键词： real-time system group priority success ratio,switching

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2.5D scattering of incident plane SV waves by a canyon in layered half-space

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Earthquake Engineering and Engineering Vibration 2010年第4期9卷 587-595页

作者： ba Zhenning Liang Jianwen Department of Civil Engineering Tianjin University Tianjin 300072 China Key Laboratory of Coast Civil Structure Safety （ Tianjin University） Ministry of Education

This paper presents a 2.5D scattering of incident plane SV waves by a canyon in a layered half-space by using the indirect boundary element method （IBEM）. A free field response analysis is performed to provide the displacements and stresses on the boundary of the canyon where fictitious uniform moving loads are applied to calculate the Green＇s *** for the displacements and stresses. The amplitudes of the loads are determined by the boundary conditions. The free field displacements are added to the fictitious uniform moving loads induced displacements and the total response is obtained. Numerical calculations are performed for a canyon with homogenous and in one layer over bedrock. The effects of the thickness and stiffness of the layer on the amplification are studied and discussed.

关键词： layered half-space canyon plane SV wave amplification scattering surface layer indirect boundaryelement method

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The effect of propagation delay on the dynamic evolution of the Bitcoin blockchain

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Digital Communications and Networks 2020年第2期6卷 157-166页

作者： Moustapha ba MOdaL’X(Laboratoire de Modélisation aléatoire)of UniversitéParis Nanterre(Paris X) MODAL’X is the Mathematics and Computer Sciences laboratory of UniversitéParis Nanterre(Paris X)ministerial label EA 3454UFR SEGMIdépartement Mathématiques-Informatique200 avenue de la République92000NanterreFrance

This paper analyzes the selfish-mine strategy in the Bitcoin blockchain introduced in 2013 by *** and *** strategy could be used by a colluding pool of miners to earn more than their fair share of the mining revenue and in consequence to force other honest miners to join them to decrease the variance of their revenues and make their monthly revenues more *** is a very dangerous dynamic that could allow the rogue pool of miners to go toward a majority by accumulating powers of news adherents and control the entire *** that the propagation delay of information between any two miners in the network,which is not negligible and follows a normal distribution with mean proportional to the physical distance between the two miners,and a constant variance independent of others'delays,we prove that no guarantee can be given about the success or failure of the selfish-mine attack because of the variability of information propagation in the network.

关键词： Blockchain Bitcoin Mining Selfish-mine attack Propagation delay of information

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Systematic Training of Liver Imaging Reporting and data System Magnetic Resonance Imaging v2018 can Improve the Diagnosis of Hepatocellular carcinoma for Different Radiologists

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Journal of Clinical and Translational Hepatology 2021年第4期9卷 537-544页

作者： A-Hong Ren Hui Xu da-Wei Yang Nan Zhang Te ba Zhen-Chang Wang Zheng-Han Yang Department of Radiology Beijing Friendship HospitalCapital Medical UniversityBeijingChina Department of Radiology The First Hospital of Beijing Fangshan DistrictBeijingChina

background and Aims:Liver imaging reporting and data system(LI-RADS)provides standardized lexicon and categorization for diagnosing hepatocellular carcinoma(HCC).However,there is limited knowledge about the effect of LI-RADS *** prospectively explored whether the systematic training of LI-RADS v2018 on magnetic resonance imaging(MRI)can effectively improve the diagnostic performances of different radiologists for ***:A total of 20 visiting radiologists and the multiparametric MRI of 70 hepatic observations in 61 patients with high risk of HCC were included in this *** LI-RADS v2018 training procedure included three times of thematic lectures(each lasting for 2.5 h)given by a professor specialized in imaging diagnosis of liver,with an interval of a *** each seminar,the radiologists had a month to adopt the algorithm into their daily *** diagnostic performances and interobserver agreements of these radiologists adopting the algorithm for HCC diagnosis before and after training were ***:A total of 20 radiologists(male/female,12/8;with an average age of 36.75±4.99 years)were *** training,the interobserver agreements for the LI-RADS category for all radiologists(p=0.005)were *** sensitivity,specificity,positive predictive value,negative predictive value,and coincidence rate of all radiologists for HCC diagnosis before and after training were 43%vs.54%,86%vs.88%,74%vs.81%,62%vs.67%,and 65%vs.71%,*** diagnostic performances of all radiologists(pcan effectively improve the diagnostic performances of radiologists with different experiences for HCC.

关键词： Magnetic resonance imaging Liver neoplasm Diagnostic imaging Training program Liver Imaging Reporting and data System

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An IBM2 Description of the E(5) Symmetry in 134ba.a.d 108pd

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Communications in Theoretical Physics 2002年第7期38卷 71-74页

作者： ZHANG da-Li WANG Hong-Ling Department of Physics Huzhou Teacher''s College Huzhou 313000 Zhejiang Province China Department of Physics Xuchang Teacher''s College Xuchang 461000 Henan Province China

With the low-lying energy levels, E2 transition branching ratios and absolute transition rates of the 134ba.a.d 108Pd, are investigated in the neutron-proton interacting boson model (IBM2) which includes the quadrupole quadrupole interaction between like bosons and the E(5) symmetry, it shows that the IBM2 can describe the nuclei at critical point of a phase transition well.

关键词： E(5) symmetry, 134ba, 108pd, neutron-proton interaction boson model

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移植物厚度对角膜内皮失代偿行简易后弹力层角膜内皮移植效果的影响

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中国组织工程研究 2025年第6期29卷 1199-1207页

作者：巴颜红高明宏陈颖欣中国人民解放军北部战区总医院辽宁省沈阳市110000

背景:研究表明较薄移植物视力恢复更快、排斥风险更低,国内缺乏对内皮移植术后不同植片厚度的临床疗效分析,因此,确定最佳移植物厚度对于提高手术疗效至关重要。目的:评价简易后弹力层剥离内皮角膜移植术后不同植片厚度对视力恢复及其... 详细信息

背景:研究表明较薄移植物视力恢复更快、排斥风险更低,国内缺乏对内皮移植术后不同植片厚度的临床疗效分析,因此,确定最佳移植物厚度对于提高手术疗效至关重要。目的:评价简易后弹力层剥离内皮角膜移植术后不同植片厚度对视力恢复及其他预后指标的影响。方法:选取2013年1月至2023年2月在北部战区总医院接受简易后弹力层剥离内皮角膜移植手术治疗的角膜内皮失代偿患者共72例(72眼),其中薄植片组(0.05);③两组患者继发性青光眼、植片免疫排斥、植片移位等术后并发症发生率比较差异无显著性意义(P>0.05);④两组术后1年植片生存率比较差异无显著性意义(93.8%,92.3%,P>0.05);⑤结论:简易后弹力层剥离内皮角膜移植术是一种安全有效的角膜内皮移植手术方式,其术后疗效与传统后弹力层剥离内皮角膜移植术相似,而且植片植入方式更为简便。较薄植片能够更早提供最佳矫正视力,更早完成角膜重塑,因此在治疗角膜内皮失代偿疾病时,优先选择薄移植物来提高恢复时间。

关键词：后弹力层撕除角膜内皮移植术角膜内皮失代偿继发性青光眼植片移位原发移植失败植片排斥角膜内皮细胞数角膜移植

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Characterization of Arithmetic Functions that Preserve the Sum-of-squares Operation

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Acta Mathematica Sinica,English Series 2014年第4期30卷 689-695页

作者： Bojan baI Department of Mathematics and Informatics University of Novi Sad

We characterize all functions f ： N → C such that f（m^2 ＋ n^2） = f（m）^2 ＋ f（n）^2 for all m, n ∈ N. It turns out that all such functions can be grouped into three families, namely f ≡ 0, f（n） = ±n （subject to some restrictions on when the choice of the sign is possible） and f（n） =±l/2（again subject to some restrictions on when the choice of the sign is possible）.

关键词： Arithmetic function functional equation sum of squares

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Time-dependent diffusion magnetic resonance imaging:measurement,modeling,and applications

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第10期25卷 765-787页

作者： Ruicheng ba Liyi KANG dan WU Key Laboratory for Biomedical Engineering of Ministry of Education Department of Biomedical EngineeringCollege of Biomedical Engineering&Instrument ScienceZhejiang UniversityHangzhou 310027China

Increasingly,attention is being directed towards time-dependent diffusion magnetic resonance imaging(TDDMRI),a method that reveals time-related changes in the diffusional behavior of water molecules in biological tissues,thereby enabling us to probe related microstructure *** ongoing improvements in hardware and advanced pulse sequences,significant progress has been made in applying TDDMRI to clinical *** development of accurate mathematical models and computational methods has bolstered theoretical support for TDDMRI and elevated our understanding of molecular *** this review,we introduce the concept and basic physics of TDDMRI,and then focus on the measurement strategies and modeling approaches in short-and long-diffusion-time ***,we discuss the challenges in this field,including the requirement for efficient scanning and data processing technologies,the development of more precise models depicting time-dependent molecular diffusion,and critical clinical applications.

关键词： Time-dependent diffusion Diffusion magnetic resonance imaging(dMRI) Microstructure imaging Microstructural model

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Effects of Cerium Doping at Ti Sites and Europium Doping at ba Sites on Dielectric Properties of baTiO_3 Ceramics

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Chemical Research in Chinese Universities 2006年第4期22卷 515-519页

作者： ZHANG Ya-min SUN Xiu-yun LU da-yong College of Chemistry Jilin University Changchun 130021 P. R. China Applied Chemistry Jilin Institute of Chemical Technology Jilin 132022 P. R. China Venture Business Laboratory Department of Chemistry and Chemical Engineering Faculty of Engineering Yamagata University Yonezawa 992-8510 Japan

Two special rare earth elements cerium and europium were chosen to conduct chemical modification of the baTiO3 structure. The cold-pressing ceramic processing technique was used to prepare barium titanate ceramics doped with Ce at Ti sites and with Eu at ba sites on the base of formulas ba （ Ti1 -x Cex ） O3 （x = 0. 05, 0. 10 ）（CBT） and （ ba1-y Euy ） Ti1-x/8O3 （ y = 0. 05, 0. 10）（EBT）. Associated with structures and microstructures, the effects of cerium and europium doping on dielectric properties of baTiO3 ceramics were discussed. The CBT ceramics exhibit a pseudocubic perovskite structure, while the EBT ceramics exhibit a tetragonal perovskite structure with the exception of the existence of a small percentage of the Eu2Ti2O7 phase. The Curie peak of baTiO3 shifts towards room temperature at rates of 3 ℃/mol Ce atoms and 10 ℃/mol Eu atoms（ Eu≤5% ）, respectively. Compared with the CBT ceramics, the EBT ceramics show significant advantages, such as a narrow fine grain size distribution（ 1 μm）, a lower porosity and a higher density（5.85 g/cm^3）, more stable dielectric-temperature dependence（ ε′= 1600-1800 at t 〈 50℃ ） and a lower dissipation factor（〈 0. 05 ）. The stability of dielectric constant with frequency in baTiO3 can extend to 107 Hz due to Ce and Eu doping.

关键词： Cerium Europium barium titanate Cold-pressing technique Dielectric constant

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