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PathMarker:protecting web contents against inside crawlers

Cybersecurity 2019年第1期2卷 100-116页

作者： shengye wan Yue Li Kun Sun Department of Computer Science College of William and Mary Williamsburg 23187-8795VAUSA Department of Information Sciences and Technology George Mason University Fairfax 22030VAUSA

Web crawlers have been misused for several malicious purposes such as downloading server data without permission from the website ***,armoured crawlers are evolving against new anti-crawler mechanisms in the arm races between crawler developers and crawler *** this paper,based on one observation that normal users and malicious crawlers have different short-term and long-term download behaviours,we develop a new anti-crawler mechanism called PathMarker to detect and constrain persistent distributed *** adding a marker to each Uniform Resource Locator(URL),we can trace the page that leads to the access of this URL and the user identity who accesses this *** this supporting information,we can not only perform more accurate heuristic detection using the path related features,but also develop a Support Vector Machine based machine learning detection model to distinguish malicious crawlers from normal users via inspecting their different patterns of URL visiting paths and URL visiting *** addition to effectively detecting crawlers at the earliest stage,PathMarker can dramatically suppress the scraping efficiency of crawlers before they are *** deploy our approach on an online forum website,and the evaluation results show that PathMarker can quickly capture all 6 open-source and in-house crawlers,plus two external crawlers(i.e.,Googlebots and Yahoo Slurp).

关键词： Anti-Crawler mechanism Stealthy distributed inside crawler Confidential Website content protection

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Efficient and stable planar all-inorganic perovskite solar cells based on high-quality CsPbBr3 films with controllable morphology

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Journal of Energy Chemistry 2020年第7期29卷 8-15,I0001页

作者： Xiaojing wan Ze Yu Wenming Tian Fuzhi Huang shengye Jin Xichuan Yang Yi-Bing Cheng Anders Hagfeldt Licheng Sun State Key Laboratory of Fine Chemicals Institute of Artificial PhotosynthesisDUT-KTH Joint Education and Research Center on Molecular DevicesInstitute of Energy Science and TechnologyDalian University of Technology(DUT)Dalian 116024LiaoningChina State Key Laboratory of Molecular Reaction Dynamics and the Dynamic Research Center for Energy and Environmental Materials Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyLuoshi RoadWuhan 430070HubeiChina The Australian Centre for Advanced Photovoltaics(ACAP) Monash UniversityVictoria 3800Australia Laboratory of Photomolecular Science Ecole Polytechnique Federale de LausanneLausanne CH-1015Switzerland Department of Chemistry School of Engineering Sciences in ChemistryBiotechnology and HealthKTH Royal Institute of TechnologyStockholm 10044

All-inorganic cesium lead bromide(CsPbBr3)perovskite is attracting growing interest as functional materials in photovoltaics and other optoelectronic devices due to its superb ***,the fabrication of high-quality CsPbBr3 films still remains a big challenge by solution-process because of the low solubility of the cesium precursor in common ***,we report a facile solution-processed approach to prepare high-quality CsPbBr3 perovskite films via a two-step spin-coating method,in which the Cs Br methanol/H2 O mixed solvent solution is spin-coated onto the lead bromide films,followed by an isopropanol-assisted post-treatment to regulate the crystallization process and to control the film *** this fashion,dense and uniform CsPbBr3 films are obtained consisting of large crystalline domains with sizes up to microns and low defect *** effectiveness of the resulting CsPbBr3 films is further examined in perovskite solar cells(PSCs)with a simplified planar architecture of fluorine–doped tin oxide/compact Ti O2/CsPbBr3/carbon,which deliver a maximum power conversion efficiency of 8.11%together with excellent thermal and humidity *** present work offers a simple and effective strategy in fabrication of high-quality CsPbBr3 films for efficient and stable PSCs as well as other optoelectronic devices.

关键词： All-inorganic perovskite solar cells CsPbBr3 Morphology control Solution-processed Stability

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甘肃三白墩地区化探数据处理异常下限确定方法的对比研究

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新疆地质 2024年第3期42卷 466-472页

作者：陈杰雷自强张玉鹏李省晔杨镇熙方成豪万立鑫甘肃省地质矿产勘查开发局第四地质矿产勘查院甘肃酒泉735000

迭代剔除法是目前化探工作者常采用的异常下限确定方法,该方法在圈定异常过程中,要求数据须服从对数正态分布或正态分布。但在实际工作中,原始数据常不符合对数正态分布或正态分布,需弱化高背景场、强化低背景场,最终实现凸显低缓异常,... 详细信息

迭代剔除法是目前化探工作者常采用的异常下限确定方法,该方法在圈定异常过程中,要求数据须服从对数正态分布或正态分布。但在实际工作中,原始数据常不符合对数正态分布或正态分布,需弱化高背景场、强化低背景场,最终实现凸显低缓异常,缩小高背景区。本文以玉门市三白墩地区1∶1万岩屑地球化学测量数据为例,采用经典数理统计方法研究元素间相互关系。在此基础上,分别运用迭代剔除法(均值标准差法)、剖面法、累频法和分形法确定背景上限即异常下限。应用上述4种方法确定异常值分别圈定单元素异常,相互对比显示,采用分形法圈定的Au元素异常与矿化体对应性好,对找矿具指导作用,其余3种方法确定的异常面积大,局部反映了地质体岩石地球化学特征,而非真正意义上的异常,给查证带来一定难度。应用迭代剔除法圈定的As元素异常与矿化体吻合程度较高,可较好指导找矿。分形法与85%累频法圈定的异常,弱异常局部丢失,导致矿化丢失。因此,建议采用多种异常下限确定方法进行对比研究,合理确定异常下限,圈定有利找矿异常区。

关键词：勘查地球化学正态分布分形法异常下限甘肃北山

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