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Endoscopic submucosal dissection vs endoscopic mucosal resection for colorectal polyps:A meta-analysis and metaregression with single arm analysis

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World Journal of Gastroenterology 2021年第25期27卷 3925-3939页

作者： xiong chang lim Kameswara Rishi Yeshayahu Nistala Cheng Han Ng Snow Yunni Lin Darren Jun Hao Tan Khek-Yu Ho Choon-Seng Chong Mark Muthiah Yong Loo Lin School of Medicine National University of SingaporeSingapore 117597Singapore Department of Medicine National University HospitalSingapore 119074Singapore Department of Surgery National University HospitalSingapore 119074Singapore

BACKGROUND Endoscopic submucosal dissection(ESD)has shown to be effective in management of colorectal neoplasm in the Asian countries,while its implementation in Western countries where endoscopic mucosal resection(EMR)is preferred is still *** To compare the surgical,histological,and oncological outcomes between ESD and EMR in the treatment of colorectal polyps,with subgroup analysis comparing the efficacy of ESD and EMR between Japan and the rest of the *** Embase and Medline databases were searched from inception to October 2020 in accordance with PRISMA guidelines for studies comparing en bloc,complete resection,margin involvement,resection time,need for additional surgery,complications,and recurrence rate of ESD with *** Of 281344 colorectal polyps from 21 studies were *** compared to EMR,the pooled analysis revealed ESD was associated with higher en bloc and complete resection rate,and lower lateral margin involvement and *** led to increased procedural time,need for additional surgery,and perforation *** significant difference in bleeding risk was found between the two ***-regression analysis suggested only right colonic polyps correlated with an increased perforation risk in *** including polyp size and invasion depth did not significantly influence the en bloc and complete resection rate,bleeding risk and *** subgroup analysis,Japan performed better than the rest of the world in both ESD and EMR with perforation risk of 4%and 0.0002%,respectively,as compared to perforation risk of 8%and 1%,respectively,in reports coming from rest of the *** ESD resulted in better resection outcomes and lower recurrence compared to *** appropriate training,ESD is preferred over EMR as the first-line therapy for resection of colorectal polyps,without restricting to lesions greater than 20 mm and those with high suspicion of submucosal invasion.

关键词： Endoscopic mucosal resection Endoscopy Colonic polyps Colorectal neoplasm Colonoscopy

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Blaschke Isoparametric Hypersurfaces in the Conformal Space Q_1^(n+1),Ⅰ

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Acta Mathematica Sinica,English Series 2015年第11期31卷 1751-1758页

作者： chang xiong NIE Faculty of Mathematics and Statistics Hubei University

Let x ：M - Qn＋l be a regular hypersurface in the conformal space Qn＋I. We classify all the space-like Blaschke isoparametric hypersurfaces with two distinct Blaschke eigenvalues in the conformal space up to the con... 详细信息

关键词： Regular hypersurfaces conformal invariants Blaschke isoparametric Lorentzian spaceforms

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塔中隆起奥陶系油气性质及运聚富集模式

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岩性油气藏 2025年第1期37卷 53-67页

作者：熊昶王彭刘小钰王伟赵星星孙冲中国石油塔里木油田公司勘探开发研究院新疆库尔勒841000 中国石油天然气集团有限公司超深层复杂油气藏勘探开发技术研发中心新疆库尔勒841000 新疆维吾尔自治区超深层复杂油气藏勘探开发工程研究中心新疆库尔勒841000 中国石油塔里木油田公司油气田产能建设事业部新疆库尔勒841000

以构造、断裂分布、生产动态以及地球化学等资料为基础,对塔中地区奥陶系油气性质与产能分布特征进行了分析,从油气充注、输导体系、构造与油气运聚关系等3个方面对油气富集因素进行了分析,并建立了成藏模式。研究结果表明:①塔中地区... 详细信息

以构造、断裂分布、生产动态以及地球化学等资料为基础,对塔中地区奥陶系油气性质与产能分布特征进行了分析,从油气充注、输导体系、构造与油气运聚关系等3个方面对油气富集因素进行了分析,并建立了成藏模式。研究结果表明:①塔中地区奥陶系原油以轻质原油为主,具有低密度、低黏度、低含硫的特征,密度为0.75~0.85 g/m^(3),油气藏气油比为119~82367 m^(3)/m^(3),多相态油气藏并存,且油气相态无明显边界;天然气干燥系数为0.70~0.98,天然气甲烷碳同位素为-35.7‰~-61.4‰,变化范围大;不同区域金刚烷指数(MDI)差异较大,为0.33~0.64;8个主要油气充注点具有原油密度低、气油比高、天然气甲烷同位素及MDI高的特征,沿走滑断裂带向南或远离断裂带方向密度变大,气油比、甲烷碳同位素及MDI均变小,不同区块气侵强度不同造成变化规律存在局部差异。②研究区油气分布格局主要受点状油气充注影响,8个油气充注点周缘油气井通常具有较高的产量,受储层发育规模影响会出现低产井,产能分布具有“北气南油”、“中间气、两边油”及“普遍富气、局部含油”3种类型;远离充注点的低产井及水井大范围分布。③研究区奥陶系油气富集模式为张扭性大断裂控制油气垂向充注,不整合面及走滑断裂控制油气的侧向调整,断裂破碎带叠加层间岩溶为油气聚集提供了储集空间,局部构造高部位及平台区为油气聚集有利指向区。

关键词：轻质原油金刚烷指数张扭性大断裂走滑断裂不整合面断裂破碎带岩溶作用奥陶系塔中隆起塔里木盆地

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Group LASSO for change-points in Functional Time Series

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Acta Mathematica Sinica,English Series 2023年第11期39卷 2075-2090页

作者： chang xiong CHI Rong Mao ZHANG School of Mathematical Sciences Zhejiang UniversityHangzhou 310058P.R.China

Multiple change-points estimation for functional time series is studied in this *** change-point problem is first transformed into a high-dimensional sparse estimation problem via basis *** least absolute shrinkage and selection operator(LASSO)is then applied to estimate the number and the locations of possible change ***,the group LASSO(GLASSO)always overestimate the true *** circumvent this problem,a further Information Criterion(IC)is applied to eliminate the redundant estimated *** is shown that the proposed two-step procedure estimates the number and the locations of the change-points *** and two temperature data examples are also provided to illustrate the finite sample performance of the proposed method.

关键词： Basis function change-point functional time series information criterion group LASSO(GLASSO)

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Towards overcoming data scarcity in materials science:unifying models and datasets with a mixture of experts framework

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npj Computational Materials 2022年第1期8卷 2322-2330页

作者： Rees chang Yu-xiong Wang Elif Ertekin Department of Materials Science and Engineering University of Illinois at Urbana-Champaign1304 West Green StreetUrbana61801ILUSA Department of Computer Science University of Illinois at Urbana-Champaign201 North Goodwin AvenueUrbana61801ILUSA Materials Research Laboratory University of Illinois at Urbana-Champaign104 South Goodwin AvenueUrbana61801ILUSA Department of Mechanical Science and Engineering University of Illinois at Urbana-Champaign1206 West Green StreetUrbana61801ILUSA

While machine learning has emerged in recent years as a useful tool for the rapid prediction of materials properties,generating sufficient data to reliably train models without overfitting is often *** overcoming this limitation,we present a general framework for leveraging complementary information across different models and datasets for accurate prediction of data-scarce materials *** approach,based on a machine learning paradigm called mixture of experts,outperforms pairwise transfer learning on 14 of 19 materials property regression tasks,performing comparably on four of the remaining *** approach is interpretable,model-agnostic,and scalable to combining an arbitrary number of pre-trained models and datasets to any downstream property prediction *** anticipate the performance of our framework will further improve as better model architectures,new pre-training tasks,and larger materials datasets are developed by the community.

关键词： prediction mixture property

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Quadratic Stabilization of Switched Uncertain Linear Systems: A Convex Combination Approach

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IEEE/CAA Journal of Automatica Sinica 2019年第5期6卷 1116-1126页

作者： Yufang chang Guisheng Zhai Bo Fu Lianglin xiong the School of Electrical and Electronic Engineering Hubei University of TechnologyWuhan 430068China the Department of Mathematical Sciences Shibaura Institute of TechnologySaitama 337-8570Japan the School of Mathematics and Computer Science Yunnan Minzu UniversityKunming 650500China

We consider quadratic stabilization for a class of switched systems which are composed of a finite set of continuoustime linear subsystems with norm bounded uncertainties. Under the assumption that there is no single quadratically stable subsystem, if a convex combination of subsystems is quadratically stable, then we propose a state-dependent switching law, based on the convex combination of subsystems, such that the entire switched linear system is quadratically stable. When the state information is not available, we extend the discussion to designing an outputdependent switching law by constructing a robust Luenberger observer for each subsystem.

关键词： Convex combination limear matrix inequalities (LMIs) norm bounded uncertainties output-dependent switching, quadratic stabilization state-dependent switching switched uncertain linear systems(SULS)

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Economic Assessment of Standby Diesel Generator for Peak Reduction in Commercial and Industrial Buildings:A Case Study in Malaysia

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Journal of Electronic Science and Technology 2017年第4期15卷 400-406页

作者： Kein Huat Chua Yun Seng lim Jee xiong Chew Universiti Tunku Abdul Rahman Cheras 43000 Malaysia

This paper outlines the barriers and potential benefits of using standby diesel generators in mitigating the peak demands for commercial and industrial customers. The feasibility of utilizing the standby diesel generators to reduce the electricity bills for customers is carried out by using the hybrid optimization model for electric renewable(HOMER)software. The size of the standby diesel generator and its operational duration are determined based on the lowest cost of electricity obtained from the evaluations. The economic assessments demonstrate that there is potential to reduce the electricity bills for commercial and industrial customers under the existing fuel price and tariffs. The commercial customers under the tariff C2 have the highest potential to save their electricity bills with the use of standby diesel generators for peak reduction. This study demonstrates the potential of the standby diesel generators in peak reduction.

关键词： Commercial and industrial customers cost of electricity hybrid optimization model for electric renewable(HOMER) peak reduction standby diesel generator

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Margolus-Levitin speed limit across quantum to classical regimes based on trace distance

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Chinese Physics B 2020年第5期29卷 80-84页

作者： Shao-xiong Wu chang-Shui Yu School of Science North University of ChinaTaiyuan 030051China School of Physics Dalian University of TechnologyDalian 116024China

The classical version of Mandelstam-Tamm speed limit based on theWigner function in phase space was reported by Shanahan et al.[***.120070401(2018)].We present the Margolus-Levitin speed limit across the quantumto-classical transition in phase space based on the trace *** Margolus-Levitin speed limit is set by the Schatten L1 norm of the generator of time-dependent evolution for both the quantum and classical *** an example,the time-dependent harmonic oscillator is considered to illustrate the result.

关键词： quantum speed limit Wigner function phase space Margolus-Levitin bound

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X-ray Photoemission Spectroscopy Studies of the Semiconducting Molybdenum Purple Bronze Bi_(0.2)MoO_3

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Journal of Materials Science & Technology 2006年第4期22卷 487-490页

作者： Rui xiong chang LUO Wufeng TANG Jing SHI Department of Physics Wuhan University Wuhan 430072 China International Center for Materials Physics Chinese Academy of Sciences Shenyang 110016 China

The electronic structure of the quasi-two-dimensional （2D） semiconducting molybdenum purple bronze Bio.2MoO3 was presented by X-ray photoemission spectroscopy. The valence band of Bio.2MoO3 is made up of Opπ nonbonding level, π and a bonding bands. The peak at 1.5 eV and the shoulder at 0.5 eV in the forbidden band may be formed from the non-bonding dxy orbitals of some Mo atoms. The O1s core-level spectrum demonstrates the presence of two inequivalent bonds of oxygen ions in Bio.2MoO3. Bi4f core-level spectrum shows two bonding characters of Bi atoms in bismuth molybdenum single crystal. Mo3d core-level spectrum confirms two kinds of valence states of Molybdenum （Mo^＋5 and Mo^＋6）. Ar^＋ ion irradiation induces more significant distortion of MoO6 octahedra.

关键词： Bi0.2MoO3 single crystal X-ray photoemission spectroscopy Core-electron spectrum

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Safety-Constrained Multi-Agent Reinforcement Learning for Power Quality Control in Distributed Renewable Energy Networks

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Computers, Materials & Continua 2024年第4期79卷 449-471页

作者： Yongjiang Zhao Haoyi Zhong chang Cyoon lim Department of Computer Engineering Chonnam National UniversityYeosu59626South Korea

This paper examines the difficulties of managing distributed power systems,notably due to the increasing use of renewable energy sources,and focuses on voltage control challenges exacerbated by their variable nature in modern power *** tackle the unique challenges of voltage control in distributed renewable energy networks,researchers are increasingly turning towards multi-agent reinforcement learning(MARL).However,MARL raises safety concerns due to the unpredictability in agent actions during their exploration *** unpredictability can lead to unsafe control *** mitigate these safety concerns in MARL-based voltage control,our study introduces a novel approach:Safety-ConstrainedMulti-Agent Reinforcement Learning(SC-MARL).This approach incorporates a specialized safety constraint module specifically designed for voltage control within the MARL *** module ensures that the MARL agents carry out voltage control actions *** experiments demonstrate that,in the 33-buses,141-buses,and 322-buses power systems,employing SC-MARL for voltage control resulted in a reduction of the Voltage Out of Control Rate(%***)from0.43,0.24,and 2.95 to 0,0.01,and 0.03,***,the Reactive Power Loss(Q loss)decreased from 0.095,0.547,and 0.017 to 0.062,0.452,and 0.016 in the corresponding systems.

关键词： Power quality control multi-agent reinforcement learning safety-constrained MARL

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