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Analysis and Modeling of Mobile Phone Activity Data Using Interactive Cyber-Physical social system

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Computers, Materials & Continua 2024年第9期80卷 3507-3521页

作者： Farhan Amin Gyu sang choi school of Computer science and Engineering Yeungnam UniversityGyeongsan38541Republic of Korea

Mobile networks possess significant information and thus are considered a gold mine for the researcher’s *** call detail records(CDR)of a mobile network are used to identify the network’s efficacy and the mobile user’s *** is evident from the recent literature that cyber-physical systems(CPs)were used in the analytics and modeling of telecom *** addition,CPs is used to provide valuable services in smart *** general,a typical telecom company hasmillions of subscribers and thus generatesmassive amounts of *** this aspect,data storage,analysis,and processing are the key *** solve these issues,herein we propose a multilevel cyber-physical social system(CPss)for the analysis and modeling of large internet *** proposed multilevel system has three levels and each level has a specific ***,raw Call Detail Data(CDR)was collected at the first ***,the data preprocessing,cleaning,and error removal operations were *** the second level,data processing,cleaning,reduction,integration,processing,and storage were ***,suggested internet activity record measures were *** proposed system initially constructs a graph and then performs network *** proposed CPss system accurately identifies different areas of internet peak usage in a city(Milan city).Our research is helpful for the network operators to plan effective network configuration,management,and optimization of resources.

关键词： Cyber-physical social systems big data cyber-physical systems pervasive computing smart city big data management techniques

Landau-Ginzburg/Calabi-yau Correspondence via Wall-Crossing

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Chinese Annals of Mathematics,series B 2017年第4期38卷 883-900页

作者： Jinwon choi young-Hoon KIEM Department of Mathematics Sookmyung Women’s University Department of Mathematics Seoul National University

Landau-Ginzburg/Calabi-yau correspondence claims the equivalence between the Gromov-Witten theory and the Fan-Jarvis-Ruan-Witten theory. The authors survey recently developed wall-crossing approach to the Landau-Ginzb... 详细信息

关键词： Gromov-Witten invariant Fan-Jarvis-Ruan-Witten invariant Moduli space Quasimap Wall-crossing

Impact of power system network topology errors on real-time locational marginal price

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Journal of Modern Power systems and Clean Energy 2017年第5期5卷 797-809页

作者： Dae-Hyun choi Le XIE school of Electrical and Electronics Engineering Chung-ang UniversityDongjak-guSeoul 156-756Republic of Korea Department of Electrical and Computer Engineering Texas A&M UniversityCollege StationTXUSA

This paper examines the impact of power transmission network topology change on locational marginal price(LMP) in real-time power markets. We consider the case where the false status of circuit breakers(CBs) that bypass topology error processing can generate an incorrect power system network topology, subsequently distorting the results of the state estimation and economic *** main goal of this paper is to assess the economic impact of this misconfigured network topology on realtime LMP in an entire power system with network congestion. To this end, we start with our prior result, a simple and analytical congestion price equation, which can be applied to any.s.ngle line congestion scenario. This equation can be extended to better understand the degree to which the LMP at any bus changes due to any line status error. Furthermore, it enables a rigorous analysis of the relationship between the change in LMP at any bus with respect to any line error and various physical/economical grid conditions such as the bidding prices for marginal generators and the locations of the congested/erroneous lines. Numerical examples on the impact analysis of this topology error are illustrated in IEEE 14-bus and 118-bus systems.

关键词： Power market Economic dispatch Locational marginal price Power system network topology

Quantum-classical correspondence for the inverted oscillator

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Chinese Physics C 2017年第11期41卷 56-62页

作者： Mustapha Maamache Jeong Ryeol choi Laboratoire de Physique Quantique et systèmes Dynamiques Faculté des SciencesUniversité Ferhat Abbas Sétif 1 Sétif 19000 Department of Radiologic Technology Daegu Health College

While quantum-classical correspondence for a system is a very fundamental problem in modern physics,the understanding of its mechanism is often elusive,so the methods used and the results of detailed theoretical analysis have been accompanied by active *** this study,the differences and similarities between quantum and classical behavior for an inverted oscillator have been analyzed based on the description of a complete generalized Airy function-type quantum wave *** inverted oscillator model plays an important role in several branches of cosmology and particle *** quantum wave packet of the system is composed of many.s.b-packets that are localized at different positions with regular intervals between *** is shown from illustrations of the probability density that,although the quantum trajectory of the wave propagation is somewhat different from the corresponding classical one,the difference becomes relatively.s.all when the classical excitation is sufficiently *** have confirmed that a quantum wave packet moving along a positive or negative direction accelerates over time like a classical *** these main interpretations and others in the text,we conclude that our theory exquisitely illustrates quantum and classical correspondence for the system,which is a crucial concept in quantum mechanics.

关键词： quantum-classical correspondence inverted oscillator quantum wave packet

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动态电压恢复器研究综述

电力系统自动化 2007年第9期31卷 101-107页

作者：王同勋薛禹胜 s.s.choi 国网南京自动化研究院/南京南瑞集团公司江苏省南京市210003 南洋理工大学新加坡639798

动态电压恢复器(DVR)作为一种重要的用户电力装置,受到国内外研究者的广泛关注。首先介绍DVR的工作原理和基本结构,然后从拓扑结构、补偿策略以及控制方法几个方面对现有文献进行综述。最后对DVR的研究发展进行了探讨。

关键词：电能质量用户电力动态电压恢复器

IgsF11-mediated phosphorylation of pyruvate kinase M2 regulates osteoclast differentiation and prevents pathological bone loss

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Bone Research 2023年第1期11卷 215-227页

作者： Hyunsoo Kim Noriko Takegahara yongwon choi Department of Pathology and Laboratory Medicine University of Pennsylvania Perelman School of MedicinePhiladelphiaPA19104USA

Osteoclasts are primary bone-resorbing cells,and receptor-activated NF-k B ligand(RANKL)stimulation is the key driver of osteoclast *** late-stage differentiation,osteoclasts become multinucleated and enlarged(so-called“maturation”),suggesting their need to adapt to changing metabolic demands and a substantial increase in ***,we demonstrate that immunoglobulin superfamily 11(Ig sF11),which is required for osteoclast differentiation through an association with the postsynaptic scaffolding protein PsD-95,regulates osteoclast differentiation by controlling the activity of pyruvate kinase M isoform2(PKM2).By using a system that directly induces the activation of Ig sF11 in a controlled manner,we identified PKM2 as a major Ig sF11-induced tyrosine-phosphorylated *** sF11 activates multiple src family tyrosine kinases(sFKs),including c-src,Fyn,and Hc K,which phosphorylate PKM2 and thereby inhibit PKM2 ***,Ig sF11-deficient cells show higher PKM2activity and defective osteoclast ***,inhibiting PKM2 activities with the specific inhibitor shikonin rescues the impaired osteoclast differentiation in Ig sF11-deficient cells,and activating PKM2 with the specific activator TEPP46 suppresses osteoclast differentiation in wild-type ***,PKM2 activation further suppresses osteoclastic bone loss without affecting bone formation in *** together,these results show that Ig sF11 controls osteoclast differentiation through PKM2 activity,which is a metabolic switch necessary for optimal osteoclast maturation.

关键词： sF11 osteoclast impaired

Compositional dependence of thermal and elastic properties of Cu-Ti-Zr-Ni bulk metallic glasses

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International Journal of Minerals,Metallurgy and Materials 2010年第3期17卷 318-322页

作者： Jihye An Hyunjune yim choi-yim Haein Department of Physics Sookmyung Women's University Department of Mechanical & system Design Engineering Hongik University

starting from the quaternary Cu47Ti34Zr11Ni8 alloy, the compositional dependence of thermal and elastic properties of Cu-Ti-Zr-Ni alloys was systematically investigated. Quaternary Cu-Ti-Zr-Ni alloys can be cast directly from the melt into copper molds to form fully amorphous strips or rods with the thickness of 3-6 mm. The evidence of the amorphous nature of the cast rods was provided by X-ray.s.ectra. The measured glass transition temperature （Tg） and crystallization temperature （Tx） were obtained for the alloys using differential scanning calorimetry （DsC） at the heating rate of 20 K/s. In the results, the differences between the glass temperature and the crystallization temperature （△Tx=Tx-Tg） are measured with values ranging up to 33-55 K. The reduced glass transition temperature （Trg）, which is the ratio of the glass temperature to the liquidus temperature （T3, is often used as an indication of the glass-forming ability of metallic alloys. For the present Cu-Ti-Zr-Ni alloys, this ratio is typically in the range of 0.5838-0.5959, characteristic of metallic alloys with good glass-forming ability. The elastic constants for several selected alloys were measured using ultrasonic methods. The values of the elastic shear modulus, bulk modulus, and Poisson＇s ratio were also given.

关键词： bulk metallic glasses (BMGs) quatemary alloys elastic constants glass-forming ability

Probabilistic seismic performance assessment of lap-spliced RC columns retrofitted by.s.eel wrapping jackets

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Earthquake Engineering and Engineering Vibration 2016年第2期15卷 223-238页

作者： Eunsoo choi Heejung youn Baik-soon Cho Department of Civil Engineering Hongik University Department of Civil Engineering CTRCInje University

In this study, the seismic fragility curves of two reinforced concrete（RC） columns that were lap-spliced at the bottom and retrofitted with steel wrapping jackets were generated. Their seismic performance was probabilistically assessed in comparison to that of lap-spliced or continuous reinforcement RC columns. This study used two types of steel wrapping jackets, a full jacket and a split jacket. Analytical models of the four types of columns were developed based on the experimental results of the columns using Open sEEs, which is effective in conducting nonlinear time history analyses. A suite of ten artificial ground motions, modified from recorded ground motions, was used to perform nonlinear time history analyses of the analytical models with scaling of the peak ground acceleration from 0.1 g to 1.0 g in increments of 0.1 g. The steel wrapping jackets did not increase the medians for yield（slight damage state） of the lap-spiced column and did not exceed the corresponding median of the continuous reinforcement column. However, the two steel jackets increased the medians for failure by 1.872 and 2.017 times, respectively, and exceeded the corresponding median of the continuous reinforcement column by 11.8% and 20.5%, respectively.

关键词： columns reinforcement reinforced exceed acceleration scaling median assessed split probabilistic

Design Development of Advanced Power Reactor 1400

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Design Development of Advanced Power Reactor 1400