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Sparse signal reconstruction via generalized two-stage thresholding

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Science China(Information Sciences) 2022年第3期65卷 288-289页

作者： Heping SONG Zehong AI Yuping LAI Hongying MENG qirong MAO School of Computer Science and Telecommunications Engineering Jiangsu University Jiangsu Key Laboratory of Security Technology for Industrial Cyberspace Jiangsu University School of Cyberspace Security Beijing University of Posts and Telecommunications Department of Electronic & Computer Engineering Brunel University London

Dear editor,The sparse representation model has received a great amount of attention in various signal and image processing applications. Compressed sensing(CS) [1] has consistently focused on devising sparse represen... 详细信息

关键词： sparse representation compressed sensing image processing signal processing optimization

Novel Design Method of COG Measurement System Via Supporting Reaction Method

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Journal of Beijing Institute of Technology 2020年第2期29卷 251-259页

作者： qirong Zhang Xin Jin Kai Zhou Zhongqing Zhang Dongmei Liu School of Mechatronic Engineering Beijing Institute of TechnologyBeijing 100081China Lu’nan Research Institute of Beijing Institute of Technology TengzhouShandong 277500China The 31st Research Third Academy of CASICBeijing 100074China State Key Laboratory of Intelligent Manufacturing System Technology for Complex Products Beijing Institute of Electronic EngineeringBeijing 100854China

Center of gravity(COG)is an important parameter of projectiles and rockets,for which supporting reaction method(or support reaction method)is an important COG measurement *** on this supporting reaction method a novel design method is proposed to determine the key design parameters of the COG measurement *** method can quantitatively analyze the influence of the design parameters on the COG accuracy,in the measurement system designed with supporting reaction *** the principle of static balance,the error propagation theory,and the system accuracy analysis method,the equal-range required sensor precision(RSP)surface and non-equal-range required sensor pair precision(RSPP)adapted surface are *** influence of random errors(like sensor accuracy and distance calibration accuracy)is *** selection strategy of equal-range and non-equal-range sensors is chosen,and then the recommended calibration accuracy values are *** the quality detection accuracy of±0.6 kg and the axial COG detection accuracy of±1.5 mm,the RSP surface is drawn by the proposed method,and the force sensor with±0.23 kg detection accuracy is *** experimental verification meets the accuracy requirements and verifies the effectiveness of the proposed design method for the system parameters of the COG measurement equipment.

关键词： center of gravity(COG) supporting reaction method required sensor precision(RSP)surface accuracy analysis parameter design

基于计算机视觉与深度学习的施工现场人员及车辆智能统计与监测

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广东土木与建筑 2024年第4期31卷 10-14页

作者：陈祺荣陈钰开林俊朱东烽广东筠诚建筑科技有限公司广东云浮527300 海南大学土木建筑工程学院海口570228

近年来,我国的建筑业飞速发展,建筑业企业生产和经营规模的不断扩大,单个项目体量也变得越来越大,极大地增加了建筑施工现场人员管理的难度。为提高施工现场的人员管理效率,借助计算机视觉技术以及深度学习算法实现施工现场人员统计与监... 详细信息

近年来,我国的建筑业飞速发展,建筑业企业生产和经营规模的不断扩大,单个项目体量也变得越来越大,极大地增加了建筑施工现场人员管理的难度。为提高施工现场的人员管理效率,借助计算机视觉技术以及深度学习算法实现施工现场人员统计与监测,利用闭路监控的实时画面实现工地现场人员的实时、高效、自动化分析。该法构建基于YOLOv4的深度学习算法模型,在识别出画面中施工人员的同时,通过撞线判定机制统计进入与离开工地的施工人员数量。除此之外,还研究开发了面向工地管理人员的施工人员管理系统,并通过试验验证该系统在不同环境条件下对施工现场人员进出场情况实时统计与监测的准确性。在现场测试过程中,发现系统在画面检测范围、算法置信度、系统冗余程度存在关键制约性问题,通过解决上述问题,极大地提高了系统的实际应用价值和鲁棒性,为系统在实际工程项目中应用打下基础。

关键词：计算机视觉深度学习 YOLOv4 施工人员统计与检测

An Efficient and Accurate Spectral Method for Acoustic Scattering in Elliptic Domains

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Numerical Mathematics(Theory,Methods and Applications) 2009年第3期2卷 258-274页

作者： qirong Fang Jie Shen Li-Lian Wang Department of Mathematics Purdue University West Lafayette IN 47907 USA. Division of Mathematical Sciences School of Physical and MathematicalSciences Nanyang Technological University 637616 Singapore.

An efficient and accurate method for solving the two-dimensional Helmholtz equation in domains exterior to elongated obstacles is developed in this *** method is based on the so called transformed field expansion(TFE) coupled with a spectral-Galerkin solver for elliptical domain using Mathieu *** results are presented to show the accuracy and stability of the proposed method.

关键词： Acoustic scattering high-order methods boundary perturbations spectral-Galerkinmethods.

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建立高流速液体流量标准装置的关键点

计量与测试技术 2024年第9期51卷 74-76页

作者：车齐荣张奇梁峰高继实独山子石化信息网络公司

本文设计了一套检管流速超过9m/s的液体流量标准装置,并对其设计关键点进行分析。同时,通过计算水头损失,确定主要设备的指标及水泵的选取原则,从而达到高流速标准装置的性能要求。

关键词：高流速液体流量标准装置水头损失

Metamorphic peridotite and rock series of ophiolite belt in Mt. Ailao, Yunnan Province

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Chinese Science Bulletin 1998年第11期43卷 955-958页

作者： Shen Shangyue Wei qirong Cheng Huilan Mo Xuanxue China Univ Geosci Wuhan 430074 Peoples R China

The metamophic peridotite of ophiolite belt in Mt. Ailao is composed of lherzolite and harzburgite. The former shows the charateristics of primary pyrolite and the latter shows those of deleted (relict)pyrolite. By partial melting of lherzolite, two primary magmas: tholeiitic magma and picrite-basalt magma are formed. The former evoluted into gabbro-diabase-pyroxenic basalt rock series and show the characteristics of MORB; while the latter evoluted into gabbro-diorite-albite basalt-picrite basalt one, and show the characteristics of para-MORB.

关键词： Yunnan Province Mt. Ailao, ophiolite belt metamorphic peridotite rock series.

Neutral-point-clamped hybrid multilevel converter with DC fault blocking capability for medium-voltage DC transmission

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Journal of Modern Power Systems and Clean Energy 2017年第4期5卷 524-536页

作者： Xinyu YU Yingdong WEI qirong JIANG Xiaorong XIE Yuquan LIU Ke WANG Department of Electrical Engineering Tsinghua UniversityBeijing 100084China Guangzhou Power Supply Co.Ltd. Guangzhou 510620China

This paper proposes a novel hybrid multilevel converter with DC fault-blocking capability, i.e., the neutral-point clamped hybrid multilevel converter(NHMC).By employing two types of unipolar full-bridge submodules along with director switches, which are composed of seriesconnected insulated-gate bipolar transistors, the NHMC combines the features and advantages of the neutral-point clamped converter and the modular multilevel *** basic topology, operating principles, modulation scheme, and energy-balancing scheme of the NHMC are presented. The DC fault-blocking capability of the NHMC is investigated. The number of power electronic devices used by the NHMC is calculated and compared with other multilevel converters, showing that the proposed NHMC can be an economical and feasible option for medium-voltage DC transmission with overhead lines. Simulation results demonstrate the features and operating scheme of the proposed NHMC.

关键词： Neutral-point-clamped hybrid multilevel converter(NHMC) Unipolar full-bridge submodule(UFBSM) DC fault blocking capability Modulation scheme

Lower limits of evaluation parameters for the lower Paleozoic Longmaxi shale gas in southern Sichuan Province

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Science China Earth Sciences 2013年第5期56卷 710-717页

作者： LI YanJun LIU Huan ZHANG LieHui LU ZongGang LI qirong HUANG YongBin State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Department of Resources and Environment Southwest Petroleum University South Sichuan Gas Field of Southwest Oil and Gas Company PetroChina

Here we present six key parameters that have been applied to evaluate the Silurian Longmaxi shale gas accumulations of southern Sichuan *** parameters include richness of organic matter,single layer shale thickness,burial depth of the shale,maturity,shale properties,and brittle mineral *** combination with drilling data,the lower limits of these six parameters for marine shale gas have been evaluated and the following conclusions are drawn:(1)Organic carbon recovery, gas content inversion,and production tests have been applied for the first time to measure the lower limit of TOC,which is determined to be 1.0%.(2)Based on the hydrocarbon generation and expulsion theory for source rocks and the characteristics of Longmaxi shale,the lower limit of the single-layer thickness is estimated to be 30 m,of which a thickness of at least 15 m should contain high-quality shale.(3)Based on the correlation of TOC and porosity,the lower limit of gas-filled porosity is 1.2%.(4)Other parameters,such as maturity,burial depth,and brittle mineral content have also been studied with regard to the geologic conditions of southern *** on the study results,an evaluation index system has been established for highly evolved marine shale gas,and the system has been applied successfully to geologically screened shale gas occurrences in southern Sichuan Province.

关键词： shale gas lower limit evaluation system Longmaxi Formation southern Sichuan Province

双C干预方案对2型糖尿病合并卵巢癌患者化疗期间血糖波动变化、血糖达标时间及胰岛素用量的影响

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糖尿病新世界 2024年第12期27卷 101-104页

作者：车祺蓉黄蓉蓉张雪萍联勤保障部队910医院肿瘤内科福建泉州362000

目的分析化疗治疗期间2型糖尿病合并卵巢癌患者接受双C干预方案对血糖波动变化、血糖达标时间及胰岛素用量影响。方法选取2022年9月—2023年9月联勤保障部队910医院肿瘤内科收治的90例接受化疗治疗的2型糖尿病合并卵巢癌患者为研究对象... 详细信息

目的分析化疗治疗期间2型糖尿病合并卵巢癌患者接受双C干预方案对血糖波动变化、血糖达标时间及胰岛素用量影响。方法选取2022年9月—2023年9月联勤保障部队910医院肿瘤内科收治的90例接受化疗治疗的2型糖尿病合并卵巢癌患者为研究对象,按照血糖控制方式的不同分为对照组及观察组,各45例。其中对照组采取常规血糖干预,观察组采取双C干预方案。比较两组血糖波动变化(平均血糖波动幅度和日间血糖平均绝对差)、血糖达标时间及胰岛素用量。结果干预后,两组血糖波动变化、血糖达标时间及胰岛素用量相比于干预前均得到显著改善,且观察组平均血糖波动幅度、日间血糖平均绝对差和胰岛素用量均低于对照组,血糖达标时间高于对照组,差异有统计学意义(P均<0.05)。结论在接受化疗治疗期间,2型糖尿病合并卵巢癌患者采取常规血糖干预手段具有一定效果,但存在较大提升空间。相比于常规用药控制及营养支持等途径,双C干预方案可显著改善患者血糖波动变化幅度,提升血糖日达标时间并降低胰岛素用量,帮助患者更为安全高效地接受临床治疗。

关键词：化疗 2型糖尿病卵巢癌双C 血糖胰岛素