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A retroactive approach to microgrid real-time scheduling in quest of perfect dispatch solution

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Journal of Modern Power Systems and Clean Energy 2019年第6期7卷 1608-1618页

作者： Youwei JIA xue lyu Chun Sing LAI Zhao XU Minghua CHEN Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhenChina Department of Electrical Engineering The Hong Kong Polytechnic UniversityHong KongChina Department of Electrical Engineering School of AutomationGuangdong University of TechnologyGuangzhouChina School of Civil Engineering Faculty of EngineeringUniversity of LeedsLeedsUK The Chinese University of Hong Kong Hong KongChina

As an emerging paradigm in distributed power systems,microgrids provide promising solutions to local renewable energy generation and load demand ***,the intermittency of renewables and temporal uncertainty in electrical load create great challenges to energy scheduling,especially for small-scale *** of deploying stochastic models to cope with such challenges,this paper presents a retroactive approach to real-time energy scheduling,which is prediction-independent and computationally *** case studies were conducted using 3-year-long real-life system data,and the results of simulations show that the cost difference between the proposed retroactive approach and perfect dispatch is less than 11%on average,which suggests better performance than model predictive control with the cost difference at 30%compared to the perfect dispatch.

关键词： Microgrid Renewables Real-time scheduling Perfect dispatch Grid integration

基于离散事件仿真的多状态多阶段任务系统可靠性分析

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兵工学报 2017年第4期38卷 776-784页

作者：苏续军吕学志军械工程学院一系河北石家庄050003 陆军炮兵训练基地模拟训练中心河北宣化075100

介绍了多状态多任务系统可靠性参数的离散事件仿真算法。对多阶段任务系统及其特点进行了分析,提出了利用表决冷储备(AS)树描述多阶段任务系统每个阶段的逻辑结构关系。利用状态图分析了多状态多阶段任务系统的行为。依据离散事件仿真思... 详细信息

介绍了多状态多任务系统可靠性参数的离散事件仿真算法。对多阶段任务系统及其特点进行了分析,提出了利用表决冷储备(AS)树描述多阶段任务系统每个阶段的逻辑结构关系。利用状态图分析了多状态多阶段任务系统的行为。依据离散事件仿真思想,分别给出了多状态多阶段任务系统的仿真算法,具体介绍了算法的假设条件、输入参数、输出参数、算法框架、如何描述AS树、如何确定系统状态、如何确定单元转移状态。给出了计算实例,验证了该算法的正确性和有效性。该仿真算法可以很好地描述多阶段任务系统复杂行为,可以获得多种了解系统运行规律的可靠性参数,具有很强的通用性与实用性。

关键词：系统评估与可行性分析可靠性多阶段任务系统离散事件系统仿真

ACC/AHA risk score for predicting the presence and severity of coronary artery disease in a Chinese population:a cross-sectional Study

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Chinese Medical Journal 2020年第22期133卷 2753-2755页

作者： Yao Wang Jie-Fang Zhang Song-Zan Chen Qing-Bo lyu xue lyu Wen-Bin Zhang Department of Cardiology Key Laboratory of Cardiovascular Intervention and Regenerative Medicine of Zhejiang ProvinceSir Run Run Shaw HospitalSchool of MedicineZhejiang UniversityHangzhouZhejiang 310016.China

Coronary artery disease(CAD),the most common type of cardiovascular disease(CVD),remains the leading cause of mortality in both developing and developed countries,accounting for approximately 17.3 million deaths in 2013,higher than the data in 1990.111 The American College of Cardiology(ACC)/American Heart Association(AHA)score is one of the typical and accurate model to evaluate the 10-year risk of a first hard atherosclerotic cardiovascular disease(ASCVD)event based on a sex-and-race large Pooled Cohort ***,the present study aimed to investigate the association between the ACC/AHA risk score and the Gensini Score(GS)system,and determine whether ACC/AHA score could predict the presence and severity of CAD.

关键词： severity cardiovascular mortality

Endobronchial Ultrasound Elastography for Diagnosing Mediastinal and Hilar Lymph Nodes

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Chinese Medical Journal 2015年第20期128卷 2720-2725页

作者： Hai-Yan He Mao Huang Jie Zhu Hang Ma xue-Dong lyu Department of Respiratory The First People's Hospital of Nantong Nantong Jiangsu 226001 China Department of Respiratory The First Affiliated Hospital of Nanjing Medical University Nanjing Jiangsu 210029 China

Background： Pathophysiological processes, such as malignancy, can lead to the formation of stiffer tissue in lung cancers. Endobronchial ultrasound rEBUS） elastography is a novel technique for measuring tissue stiffness during EBUS-guided transbronchial needle aspiration （EBUS-TBNA）. The current study was conducted to investigate the diagnostic value of EBUS elastography tbr mediastinal and hilar lymph node metastasis in lung cancers. Methods： From January 2014 to January 2015, 40 patients suspected of lung cancer were enrolled, and a total of 68 lymph nodes were evaluated by EBUS-TBNA. EBUS-guided elastography of lymph nodes was perfornaed prior to EBUS-TBNA. Standard EBUS characteristics were also described. Pathological determination of malignant or benign lymph nodes was used as the gold standard for this study. If EBUS-TBNA did not result in a tbrmal pathological diagnosis of malignancy, patients were referred for a surgical procedure. Comparisons of elastography and standard EBUS characteristics were made between benign and malignant lymph nodes. Results： Elastography grading scores and strain ratios showed significant differences between benign and malignant lymph nodes （P = 0.000）. The elastography strain ratio was more sensitive and specific for determining malignant lymph nodes than elastography grading score or standard EBUS criteria. The receiver operating characteristic curve for the elastography strain ratio showed an area under the curve of 0.933. The best cut-off point of the strain ratio for differentiating malignant from benign lymph nodes was 32.07. The elastography strain ratio had a sensitivity of 88.1%, the specificity of 80.8%, positive predictive value of 88.1%, and negative predictive value of 80.8% for distinguishing malignant from benign nodes. The overall accuracy of elastography strain ratio was 85.3%. The strain ratio of malignant and benign lymph nodes positively correlated with the elastography grading score （r = 0.561, P = 0.000）. Co

关键词： Elastography Endobronchial Ultrasound Lung Cancer Mediastinal and Hilar Lymph Node Strain Ratio

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炮兵风险距离的仿真计算方法

火力与指挥控制 2016年第12期41卷 134-137页

作者：吕学志总参炮兵训练基地模拟训练中心河北宣化075100

现代战场非线性趋势愈加明显,炮兵火力对敌我双方以及平民都可能造成毁伤。合理确定炮兵风险距离,控制对非敌人员的杀伤风险是炮兵火力运用的重要内容。提出了炮兵风险距离的概念,并给出了仿真计算方法。首先,给出了炮兵风险距离的概念... 详细信息

现代战场非线性趋势愈加明显,炮兵火力对敌我双方以及平民都可能造成毁伤。合理确定炮兵风险距离,控制对非敌人员的杀伤风险是炮兵火力运用的重要内容。提出了炮兵风险距离的概念,并给出了仿真计算方法。首先,给出了炮兵风险距离的概念,并解释了其仿真计算原理。然后,建立了蒙特卡洛仿真模型。最后,结合实例验证了仿真计算方法的正确性。

关键词：风险距离蒙特卡洛仿真炮兵射击效率评定

Mutagenic and Estrogenic Effects of Organic Compounds in Water Treated by Different Processes: A Pilot Study

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Biomedical and Environmental Sciences 2015年第8期28卷 571-581页

作者： LU Yi lyu xue Min XIAO San Hua YANG Xiao Ming WANG Ya Zhou TANG Fei Institute of Environmental Medicine MOE Key Laboratory of Environmental and Health School of Public HealthTongji Medical College of Huazhong Science and Technology University

Objective In this study, a pilot-scale investigation was conducted to examine and compare the biotoxicity of the organic compounds in effluents from five treatment processes (P1-P5) where each process was combination of preoxidation (O3), coagulation, sedimentation, sand filtration, ozonation, granular activated carbon, biological activated carbon and chlorination (NaClO). Methods Organic compounds were extracted by XAD-2 resins and eluted with acetone and dichlormethane (DCM). The eluents were evaporated and redissolved with DMSO or DCM. The mutagenicity and estrogenicity of the extracts were assayed with the Ames test and yeast estrogen screen (YES assay), respectively. The organic compounds were detected by GC-MS. Results The results indicated that the mutation ratio (MR) of organic compounds in source water was higher than that for treated water. GC-MS showed that more than 48 organic compounds were identified in all samples and that treated water had significantly fewer types and concentrations of organic compounds than source water. Conclusion To different extents, all water treatment processes could reduce both the mutagenicity and estrogenicity, relative to source water. P2, P3, and P5 reduced mutagenicity more effectively, while P1 reduced estrogenicity, most effectively. Water treatment processes in this pilot plant had weak abilities to remove Di-n-butyl phthalate or 1, 2-Benzene dicarboxylic acid.

关键词： Water treatment processes Organic compounds Yeast estrogen screen(YES assay) Ames test GC-MS

基于文献计量的全球活化过硫酸盐氧化技术研究趋势分析

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环境工程学报 2020年第10期14卷 2895-2908页

作者：蒲生彦吕雪张颖成都理工大学生态环境学院成都610059 国家环境保护水土污染协同控制与联合修复重点实验室成都610059 中国环境科学研究院环境基准与风险评估国家重点实验室北京100012

通过激活过硫酸盐(persulfate,PS)产生硫酸根自由基是一种新兴的高级氧化技术,该方法由于无毒、高效、经济且环境友好等优势在水土污染修复中得到广泛关注。基于文献计量学和网络图分析方法,利用Web of Science核心数据库对1986—2019... 详细信息

通过激活过硫酸盐(persulfate,PS)产生硫酸根自由基是一种新兴的高级氧化技术,该方法由于无毒、高效、经济且环境友好等优势在水土污染修复中得到广泛关注。基于文献计量学和网络图分析方法,利用Web of Science核心数据库对1986—2019年以来有关过硫酸盐的文献进行回顾和梳理。使用VOSviewer(1.6.13版)软件,分析全球对过硫酸盐研究的国家、机构、作者、期刊、共引用文献及关键词等数据,并且绘制出关键词共现图谱和密度图,以分析过硫酸盐的研究历史、目前的研究热点以及发展前景。结果显示,研究热点集中在过硫酸盐的高级氧化技术、活化方法、氧化动力学和机理以及在修复土壤和地下水中的应用等。同时,基于研究热点系统归纳了过硫酸盐的活化方法及其降解污染物的实际应用,提出了当前活化过硫酸盐研究所存在的问题,并对未来的研究方向进行了展望,以期为活化过硫酸盐氧化技术在环境修复领域进一步发展和研究提供参考。

关键词：活化过硫酸盐硫酸根自由基高级氧化研究趋势文献计量学

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一种工件表面压印字符识别网络

吉林大学学报（工学版） 2024年第7期54卷 2072-2079页

作者：游新冬郭磊韩晶吕学强北京信息科技大学网络文化与数字传播北京市重点实验室北京100101

工件表面的压印字符存在凹凸不平、锈蚀、风化等问题,导致传统的字符识别算法难以取得满意的效果。针对这一问题,将工件表面压印字符的识别视为一类特殊的目标检测问题,并针对其特性设计了一种两阶段识别网络:定位-分类网络。定位网络... 详细信息

工件表面的压印字符存在凹凸不平、锈蚀、风化等问题,导致传统的字符识别算法难以取得满意的效果。针对这一问题,将工件表面压印字符的识别视为一类特殊的目标检测问题,并针对其特性设计了一种两阶段识别网络:定位-分类网络。定位网络使用无锚框的方法提取字符感兴趣区域,有效解决了字符区域提取困难的问题。分类网络采用特征解耦的卷积模块和结构重参数化技术,能够在不增加额外参数的情况下提升分类的准确率。此外,分类网络采用跨域迁移学习的训练策略,能够有效解决实际应用中的小样本和类别不平衡问题。在自建螺栓数据集和SynthText数据集上的实验结果表明,该算法的整体精度能够达到98%和92%,优于对比算法。

关键词：压印字符字符识别无锚框小样本目标检测

同方期刊数据库博看期刊评论

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添加剂对钛精矿固相碳热还原强化作用的比较

东北大学学报（自然科学版） 2013年第11期34卷 1601-1605页

作者：吕学伟张凯黄润宋兵重庆大学材料科学与工程学院重庆400044

利用热重分析法研究了硅铁、硼砂、碳酸钠三种不同添加剂对钛精矿固相碳热还原行为的影响.对这三种添加剂的TG,DTG,DSC曲线进行分析,结果表明硅铁会使钛精矿在还原过程中的失重率减少;而碳酸钠和硼砂会使钛精矿在还原过程中的失重率增加... 详细信息

利用热重分析法研究了硅铁、硼砂、碳酸钠三种不同添加剂对钛精矿固相碳热还原行为的影响.对这三种添加剂的TG,DTG,DSC曲线进行分析,结果表明硅铁会使钛精矿在还原过程中的失重率减少;而碳酸钠和硼砂会使钛精矿在还原过程中的失重率增加.三种添加剂都可以使达到最大反应速率时的温度降低.碳酸钠和硼砂可以显著提高其最大反应速率,分别提高了0.13%/min和0.18%/min;硅铁使最大反应速率降低.其强化还原机理为硅铁为反应提供一定热量,提高了反应体系的温度;硼砂促进还原过程中反应物的传输;碳酸钠可以增强碳的气化反应.

关键词：钛精矿添加剂固相还原热重法失重率