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基于电-水跨层耦合模型的城市电网脆弱性评估

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电工技术学报 2024年第16期39卷 5075-5090页

作者：严奕陆刘文霞石庆鑫刘耕铭李承泽新能源电力系统全国重点实验室(华北电力大学) 北京102206

为更好地揭示极端场景下城市电网对供水网的复杂影响,该文考虑城市电-水主干网及用户侧的耦合特征,构建城市电-水跨层耦合模型,并分析计及供水服务损失的电网脆弱性。首先,建立城市电网及供水网的拓扑和能流模型;其次,分析高压配电变电... 详细信息

为更好地揭示极端场景下城市电网对供水网的复杂影响,该文考虑城市电-水主干网及用户侧的耦合特征,构建城市电-水跨层耦合模型,并分析计及供水服务损失的电网脆弱性。首先,建立城市电网及供水网的拓扑和能流模型;其次,分析高压配电变电站与泵站、中压配电变压器与用户侧高层建筑水泵两种不同层级的电-水耦合关系,建立城市电-水跨层耦合模型;再次,考虑蓄意攻击场景下电网的切负荷应急调度策略,并分析城市电-水三层故障传导效应,量化和评估高压配电网侧故障对供水网用户侧供水量的影响;最后,以某市级电网和供水网为例,评估蓄意攻击场景下计及供水服务损失的城市电网脆弱性,并分析其受电力负荷与需水量时序变化的影响。研究结果能为考虑电-水故障传导效应下识别电网薄弱点,提升城市韧性提供参考。

关键词：城市电网城市供水网故障传导脆弱性分析

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基于多元数据驱动的配电网户变关系识别方法

上海电力大学学报 2024年第3期40卷 214-219页

作者：李承泽杨秀上海电力大学电气工程学院上海200090

针对配电网户变关系识别不准确而影响配电网正常运作和故障诊断定位的问题,提出了一种基于多元数据驱动的配电网户变关系识别方法。首先,定义了电压的多维波动特征参数指标;其次,采用t分布随机邻域嵌入(t-SNE)算法对电压波动特征矩阵进... 详细信息

针对配电网户变关系识别不准确而影响配电网正常运作和故障诊断定位的问题,提出了一种基于多元数据驱动的配电网户变关系识别方法。首先,定义了电压的多维波动特征参数指标;其次,采用t分布随机邻域嵌入(t-SNE)算法对电压波动特征矩阵进行降维;然后,利用BIRCH聚类算法对降维后的电压波动特征进行聚类,生成虚拟用户;最后,基于用户功率与上级电表的功率平衡关系假设进行户变关系配对,完成配电网户变关系的识别。案例分析结果表明,相比于之前的户变关系识别方法,所提方法提高了识别准确率。

关键词：配电网特征降维功率平衡户变关系

Boundary-aware texture region segmentation from manga

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Computational Visual Media 2017年第1期3卷 61-71页

作者： Xueting liu chengze li Tien-Tsin Wong The Chinese University of Hong Kong Hong KongChina Shenzhen Research Institute the Chinese University ofHong KongShenzhenChina

Due to the lack of color in manga(Japanese comics), black-and-white textures are often used to enrich visual experience. With the rising need to digitize manga, segmenting texture regions from manga has become an indispensable basis for almost all manga processing, from vectorization to colorization. Unfortunately, such texture segmentation is not easy since textures in manga are composed of lines and exhibit similar features to structural lines(contour lines). So currently, texture segmentation is still manually performed, which is labor-intensive and time-consuming. To extract a texture region, various texture features have been proposed for measuring texture similarity, but precise boundaries cannot be achieved since boundary pixels exhibit different features from inner pixels. In this paper, we propose a novel method which also adopts texture features to estimate texture regions. Unlike existing methods, the estimated texture region is only regarded an initial, imprecise texture region. We expand the initial texture region to the precise boundary based on local smoothness via a graph-cut formulation. This allows our method to extract texture regions with precise boundaries. We have applied our method to various manga images and satisfactory results were achieved in all cases.

关键词： manga texture segmentation

Reference-guided structure-aware deep sketch colorization for cartoons

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Computational Visual Media 2022年第1期8卷 135-148页

作者： Xueting liu Wenliang Wu chengze li Yifan li Huisi Wu Caritas Institute of Higher Education Hong Kong SARChina Shenzhen University Shenzhen 518060China

Digital cartoon production requires extensive manual labor to colorize sketches with visually pleasant color composition and color *** colorization,the artist usually takes an existing cartoon image as color guidance,particularly when colorizing related characters or an animation ***-guided colorization is more intuitive than colorization with other hints,such as color points or scribbles,or text-based ***,reference-guided colorization is challenging since the style of the colorized image should match the style of the reference image in terms of both global color composition and local color *** this paper,we propose a novel learning-based framework which colorizes a sketch based on a color style feature extracted from a reference color *** framework contains a color style extractor to extract the color feature from a color image,a colorization network to generate multi-scale output images by combining a sketch and a color feature,and a multi-scale discriminator to improve the reality of the output *** qualitative and quantitative evaluations show that our method outperforms existing methods,providing both superior visual quality and style reference consistency in the task of reference-based colorization.

关键词： sketch colorization image style editing deep feature understanding reference-based image colorization

Experimental Study on Water-rock Reactions with CO2 Fluid in a Deep Sandstone Formation under High Temperature and Pressure

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Acta Geologica Sinica(English Edition) 2021年第1期95卷 268-279页

作者： li chengze CHEN Guojun li Chao TIAN Bing SUN Rui SU Long LU Yingxin WANG lijuan Northwest Institute of Eco-Environment and Resources Chinese Academy of SciencesLanzhou 730000China Key Laboratory of Petroleum Resources Research Gansu ProvinceLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Inner Mongolia University of Science and Technology BaotouInner Mongolia 014000China CNOOC Research Institute Co. Ltd.Beijing 100028China

Qiongdongnan Basin has a tectonic geological background of high temperature and high pressure in a deep reservoir setting,with mantle-derived CO2.A water-rock reaction device was used under high temperature and high pressure conditions,in conjunction with scanning electron microscope(SEM)observations,to carry out an experimental study of the diagenetic reaction between sandstone at depth and CO2-rich fluid,which is of great significance for revealing the dissolution of deep clastic rock reservoirs and the developmental mechanism of secondary pores,promoting deep oil and gas *** this study,the experimental scheme of the water-rock reaction system was designed according to the parameters of the diagenetic background of the deep sandstone reservoir in the Qiongdongnan *** groups of single mineral samples were prepared in this experiment,including K-feldspar samples,albite samples and calcite *** CO2 as a reaction solution,a series of diagenetic reaction simulation experiments were carried out in a semi-closed high temperature and high pressure simulation system.A field emission scanning electron microscope(SEM)was used to observe the microscopic appearance of the mineral samples after the water-rock reaction,the characteristics of dissolution under high temperature and high pressure,as well as the development of secondary *** experimental results showed that the CO2-rich fluid has an obvious dissolution effect on K-feldspar,albite and calcite under high temperature and high *** the three minerals,the main temperature and pressure window for dissolution ranged from 150℃to 300℃and 45 MPa to 60 *** electron microscope observations revealed that the dissolution effect of K-feldspar is most obvious under conditions of 150℃and 45 MPa,in contrast to conditions of200℃and 50 MPa for albite and *** the comparative analysis of experimental conditions and procedures,a coupling effect occurred between the temperature

关键词： deep reservoir high temperature and pressure CO2-rich fluid dissolution Qiongdongnan Basin

川西南雷波小沟早寒武世磷矿床磷酸盐富集沉降机制探讨

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地质论评 2024年第2期70卷 563-576页

作者：王畅程文斌张玙杨豫川金灿海董树义张君赵伟李承泽成都理工大学地球科学学院成都610059 中化地质矿山总局地质研究院北京100101 中国地质调查局成都地质调查中心成都610081 四川省地质矿产勘查开发局二零七地质队四川乐山614000 四川省地质工程勘察院集团有限公司成都610072

为了解我国扬子地区早寒武世磷块岩矿床磷酸盐的富集沉降机制,本文以川西南雷波县小沟大型磷矿床为解剖对象,采用共焦激光拉曼和激光剥蚀等离子体质谱分析(LA-ICP-MS)技术,从岩相学和地球化学的角度对其进行了初步探讨。结果显示:小沟... 详细信息

为了解我国扬子地区早寒武世磷块岩矿床磷酸盐的富集沉降机制,本文以川西南雷波县小沟大型磷矿床为解剖对象,采用共焦激光拉曼和激光剥蚀等离子体质谱分析(LA-ICP-MS)技术,从岩相学和地球化学的角度对其进行了初步探讨。结果显示:小沟矿床磷块岩主要由胶磷矿、碳酸盐矿物、有机质、硅质及少量黄铁矿组成;矿石中微生物发育,鉴定其可能为Eoentophysalis和Obruchevella;胶磷矿LA-ICP-MS原位REE分析表明,所有点位均具明显的负Ce异常,指示沉积成矿过程中氧化—次氧化的底层水与孔隙水条件。综合上述研究认为,成矿与有机质沉降及胞外聚合物(EPS)关系密切:①氧化—次氧化底层水条件下,生物有机质沉降,并在埋藏过程中迅速分解导致孔隙水中溶解磷酸盐达到过饱和是磷富集沉淀的主因。②胞外聚合物(EPS)粘附细胞和有机碎屑,加速了生物有机质的聚集沉降,埋藏过程中,胞外聚合物为磷质聚集提供大量成核位点,促进了胶磷矿的快速析出与沉淀。

关键词：川西南雷波县小沟磷矿富集沉降激光拉曼分析

达原饮调控TLR/MAPK/NF-κB通路防治H1N1感染诱发急性肺损伤的作用机制

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中国实验方剂学杂志 2024年第18期30卷 52-60页

作者：李承泽褚福浩李园刘运泽郑浩呈王思慈顾益枭朱万鸿张若诗宋行健盖聪丁霞北京中医药大学中医学院北京100102 北京中医药大学中药学院北京100102 北京中医药大学国家中医体质与治未病研究院北京100102 北京中医药大学东直门医院北京101121

目的:探究达原饮对H1N1感染诱发的急性肺损伤的药效及其潜在机制。方法:使用超高效液相色谱-四级杆静电场轨道阱质谱仪对达原饮水煎液进行药物成分分析。将48只雌性BALB/c小鼠随机分为正常组、模型组、奥司他韦组(19.5 mg·kg^(-1))、... 详细信息

目的:探究达原饮对H1N1感染诱发的急性肺损伤的药效及其潜在机制。方法:使用超高效液相色谱-四级杆静电场轨道阱质谱仪对达原饮水煎液进行药物成分分析。将48只雌性BALB/c小鼠随机分为正常组、模型组、奥司他韦组(19.5 mg·kg^(-1))、达原饮低、中、高剂量组(2.73、5.46、10.92 g·kg^(-1))。正常组和模型组给予去离子水灌胃,其他各组给予对应药物灌胃。给药第3天,正常组给予生理盐水滴鼻,其他各组在鼻内接种A/RP/8/34(H1N1)构建流感病毒感染的动物模型。连续给药7 d,每日称体质量。末次给药12 h后进行取材,肺组织称重,计算肺指数;苏木素-伊红(HE)染色观察肺组织及支气管病理形态学变化;微球免疫分析系统(CBA)检测血清中的γ干扰素(IFN-γ)、趋化因子(C-X-C基序)配体1(CXCL1)、肿瘤坏死因子-α(TNF-α)、趋化因子配体2(CCL2)、白细胞介素-12p70(IL-12p70)、趋化因子配体5(CCL5)、白细胞介素-1β(IL-1β)、趋化因子(C-X-C基序)配体10(CXCL10)、粒细胞-巨噬细胞集落刺激因子(GM-CSF)、白细胞介素-10(IL-10)、干扰素-β(IFN-β)、干扰素-α(IFN-α)、白细胞介素-6(IL-6)。基于质谱结果联合网络药理学,分析达原饮防治甲流病毒引起的急性肺损伤的作用机制。通过蛋白免疫印迹法(Western bolt)检测肺组织中的细胞外信号调节激酶1/2(ERK1/2)、p38丝裂原活化蛋白激酶(p38 MAPK)、核转录因子-κB(NF-κB),及其磷酸化蛋白的表达;实时荧光定量聚合酶链式反应(Real-time PCR)检测肺组织中的髓样分化因子88(MyD88)、Toll样受体3(TLR3)、Toll样受体7(TLR7)、Toll样受体8(TLR8)的mRNA表达。结果:质谱分析确定达原饮水煎液中含有芍药苷、黄芩素等57种化合物。与正常组比较,模型组小鼠体质量下降(P<0.01),肺部水肿和出血,肺指数升高(P<0.01),IFN-γ、IL-12p70、CCL5、IL-1β、CXCL10、GM-CSF、IFN-β、IL-6显著升高(P<0.01)。与模型组比较,达原饮治疗组小鼠肺泡壁增厚、毛细血管充血和免疫细胞浸润的病理变化明显减轻,体质量和肺指数改变减轻(P<0.01),IFN-γ、IL-12p70、CCL5、IL-1β、CXCL10、GM-CSF、IFN-β、IL-6蛋白表达量显著下降(P<0.01);网络药理学分析共获得57个关键基因,其中MAPK信号通路为主要的靶向信号通路。与正常组比较,模型组小鼠肺组织的p-ERK1/2、p-p38MAPK、p-NF-κB表达上升(P<0.01),TLR7、TLR8、MyD88、TLR3的mRNA表达上升(P<0.05,P<0.01)。与模型组比较,达原饮治疗组表现出剂量依赖性地抑制ERK1/2、p38 MAPK和NF-κB p65的磷酸化水平(P<0.01),同时能够下调TLR3、TLR7、TLR8、MyD88的mRNA表达(P<0.01)。结论:达原饮能够通过抑制TLR/MAPK/NF-κB信号通路,有效防治H1N1感染诱发的急性肺损伤。

关键词：达原饮流感病毒急性肺损伤炎症 Toll样受体(TLR)/丝裂原活化蛋白激酶(MAPK)/核转录因子-κB(NF-κB)信号通路

Difference in Nitrogen Starvation-Inducible Expression Patterns among Phylogenetically Diverse Ammonium Transporter Genes in the Red Seaweed <i>Pyropia yezoensis</i>

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American Journal of Plant Sciences 2019年第8期10卷 1325-1349页

作者： chengze li Inori Ariga Koji Mikami Graduate School of Fisheries Sciences Hokkaido University Hakodate Japan Faculty of Fisheries Sciences Hokkaido University Hakodate Japan

Nitrogen deficiency induces senescence and the expression of genes encoding ammonium transporters (AMTs) in terrestrial plants where the AMT family is subdivided into AMT1 and AMT2 subfamilies. Nitrogen starvation in the red seaweed Pyropia yezoensis causes senescence-like discoloration. In this study, we identified five genes in P. yezoensis encoding AMT domain-containing proteins, which were phylogenetically categorized into the AMT1 subfamily. We also found a gene encoding a Rhesus protein (Rh) that was related to, but diverged from, AMTs. Moreover, our phylogenetic analysis showed that AMT domain-containing proteins from micro- and macro-algae belonged to either the AMT1 or Rh subfamily, indicating the absence of AMT2 in algae. Gene expression analyses revealed the presence of gametophyte- and sporophyte-specific AMT1 genes that were up-regulated transiently and continually, respectively, under nitrogen-deficient conditions. In addition, up-regulated sporophyte-specific gene expression was suppressed when nitrogen was resupplied. Accordingly, an expansion of the ancient AMT gene has produced AMT1 functional variants differing in temporal and nitrogen starvation-inducible expression patterns during the life cycle of P. yezoensis. These findings help elucidate the unique nutrition starvation responses involving functionally diverse AMT1 and Rh subfamilies in red seaweed.

关键词： Ammonium Transporter Discoloration Nitrogen Pyropia yezoensis

Malware Detection in Smartphones Using Static Detection and Evaluation Model Based on Analytic Hierarchy Process

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China Communications 2012年第12期9卷 144-152页

作者： Zhang Miao Yang Youxiu Cheng Gong Dong Hang li chengze National Engineering Laboratory for Disaster Backup and Recovery Beijing University of Posts and Telecommunications Beijing 100876 P. R. China National Computer Network Emergency Response Technical Team/Coordination Center of China Beijing 100029 P. R. China

Mobile malware is rapidly increasing and its detection has become a critical issue. In this study, we summarize the common characteristics of this inalicious software on Android platform. We design a detection engine consisting of six parts： decompile, grammar parsing, control flow and data flow analysis, safety analysis, and comprehensive evaluation. In the comprehensive evaluation, we obtain a weight vector of 29 evaluation indexes using the analytic hierarchy process. During this process, the detection engine exports a list of suspicious API. On the basis of this list, the evaluation part of the engine performs a compre- hensive evaluation of the hazard assessment of software sample. Finally, hazard classification is given for the software. The false positive rate of our approach for detecting rnalware samples is 4. 7% and normal samples is 7.6%. The experimental results show that the accuracy rate of our approach is almost similar to the method based on virus signatures. Compared with the method based on virus signatures, our approach performs well in detecting unknown malware. This approach is promising for the application of malware detection.

关键词： smartphone malware analytic hierarchy process static detection