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Data-driven human and bot recognition from web activity logs based on hybrid learning techniques

Digital Communications and Networks 2024年第4期10卷 1178-1188页

作者： Marek Gajewski Olgierd Hryniewicz Agnieszka Jastrzębska mariusz kozakiewicz Karol Opara Jan Wojciech Owsiński Sławomir Zadrozny Tomasz Zwierzchowski Systems Research Institute Polish Academy of SciencesWarsawPoland Faculty of Mathematics and Information Science Warsaw University of TechnologyWarsawPoland EDGE NPD Ltd.Co WarsawPoland

Distinguishing between web traffic generated by bots and humans is an important task in the evaluation of online marketing *** of the main challenges is related to only partial availability of the performance metrics:although some users can be unambiguously classified as bots,the correct label is uncertain in many *** calls for the use of classifiers capable of explaining their *** paper demonstrates two such mechanisms based on features carefully engineered from web *** first is a man-made rule-based *** second is a hierarchical model that first performs clustering and next classification using human-centred,interpretable *** stability of the proposed methods is analyzed and a minimal set of features that convey the classdiscriminating information is *** proposed data processing and analysis methodology are successfully applied to real-world data sets from online publishers.

关键词： Web logs Classification Clustering Web traffic Bots Interpretability

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Ecological Characteristics of Two Closely Related Rodent Species in Urban Environment—Permanent Inhabitant vs Newcomer

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Natural Resources 2017年第2期8卷 69-80页

作者： Agnieszka Pieniazek Miloslawa Sokol Michal kozakiewicz Department of Ecology Faculty of BiologyBiological and Chemical Research CentreUniversity of WarsawWarsawPoland

The aim of the study was to characterize natural and urban populations of two Apodemus species—the striped field mouse (Apodemus agrarius) and the yellow-necked mouse (Apodemus flavicollis)—seeking to verify whether the different durations of synurbization have led populations of the two species to exhibit differing characteristics. The study was conducted in central Poland (in Warsaw and its surrounds, in urban parks in the city center and in natural habitats outside the city) over two seasons, during which a total of 1751 striped field mice and 454 yellow-necked mice were live-trapped (using the catch-mark-release method). We found altered characteristics of urban populations of striped field mice, which we interpret as the result of the relatively lengthy synurbization of the species over the last hundred years and its adaptation to the highly modified urban environment. A significantly higher percentage of sexually-active males and a higher average body mass were observed for the urban population of striped field mice, suggesting that the species is in better condition in urban habitats. We found urban populations of yellow-necked mice, in turn, to be unstable (as reflected in a high turn-over rate and a low percentage of retrapped mice), their survival in urban habitats only being made possible by ongoing attempts at colonization. We conclude that, in urban habitats, the system of competition between the two species exhibits a certain shift in favor of striped field mice—typically a weaker species, but the first to colonize cities. Overall, we conclude that the conditions present in urban habitats act as a strong factor shaping populations with characteristics different from those found in natural habitats. This is further enhanced by the priority effect, resulting from differing durations of urban habitation and adaptation, leading to changes in the system of competition between species.

关键词： Urbanization Small Mammals Urban Population Apodemus Priority Effect

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Poly（Vinyl Chloride） Nanocomposites Prepared in the Suspension Polymerization Process. Part I. PVC Filled with Hybrid Nanofiller

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材料科学与工程（中英文B版） 2014年第6期4卷 152-162页

作者： Agnieszka Abramowicz Maria Obloj-Muzaj Janusz kozakiewicz Department of Technology and Processing of Polymers Industrial Chemistry Research Institute Warsaw 01-793 Poland

PVC syntheses were done by suspension polymerization in the presence of hybrid silicone/acrylic core-shell type nanofiller. The moldings made from PVC nanocomposites are fully homogeneous and of good transparency. SEM images show very good, uniform dispersion of nanofiller in PVC matrix. The blends made from nanocomposites show higher tensile strength (~10%) and tensile modulus (20% higher for nanofiller amount equal to 0.2 wt.%/VCM) than PVC homopolymer. The impact strength of all samples made from PVC nanocomposites are higher than of PVC. Blends of nanocomposites containing 0.5 or 1.0 wt.%/VCM of nanofiller show the best impact strength: 28 and 32% better than PVC, respectively. Nanocomposites containing 0.5 wt.%/VCM of core-shell nanofiller show the highest stiffness. The nanofiller used practically does not influence thermal properties of the polymer. The use of PVC nanocomposites in typical PVC applications gives possibility to obtain the novel PVC products with the properties better than the present ones as well as the possibility to reduce processing costs via reduction of processing aids amounts, especially impact modifiers, what additionally will lead to tensile properties improvement.

关键词： PVC复合材料纳米复合材料纳米填料悬浮聚合聚氯乙烯聚合方法混合制备

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Sustained Effectiveness of a Mandatory Employee Influenza Vaccination Policy at a Cancer Center

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World Journal of Vaccines 2014年第4期4卷 157-163页

作者： Martin C. Mahoney Janice kozakiewicz Andrew D. Ray Department of Medicine & Employee Health Services Roswell Park Cancer Institute Buffalo New York USA Employee Health Services Roswell Park Cancer Institute Buffalo New York USA Department of Rehabilitation Science School of Public Health & Health Professions Buffalo New York USA

Objectives: Despite the well-known advantages associated with immunization, it has proven difficult to achieve high levels of influenza vaccination among Health Care Professionals (HCPs). This report describes results of an influenza vaccination program implemented within a comprehensive cancer center. Methods: Using records from calendar years 2005-2013, we completed a retrospective analysis of annual influenza vaccination rates at this center. A mandatory influenza vaccination policy was implemented in 2010, while prior to that vaccination was encouraged but not required. Vaccinations are free to employees and distributed at various locations. Annual influenza vaccination rates were examined by calendar year and by occupational group (medical, nursing, administrative, scientific, other support staff). Results: High levels of adherence with the mandatory influenza policy were observed for all employee groups. Prior to influenza vaccine mandates flu vaccination rates ranged from ~30% - 40% and increased to 85% - 89% with the mandate. Conclusions: Robust influenza vaccination rates have been sustained since implementation of a vaccination mandate supporting further expansion of policies requiring influenza vaccination for HCPs.

关键词： Influenza Vaccination Occupational Health Health Care Workers Mandatory Program Health Policy

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对用煤焦油沥青改性的用水硫化的聚氨酯橡胶的研究

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橡胶译丛 1989年第1期23卷 10-14页

作者： J.kozakiewicz 陈阿琴

异氰酸根封端的含填料的聚氨酯预聚体(PU)与煤焦油沥青—异氰酸酯加合物(CTPA)的混合,具有引人注目的流变性能。 PU/CTPA体系经过水固化后获得类似橡胶的性质,其机械性能取决于PU/CTPA的比值,如果混合物中的CTPA的含量为20％～30％,就... 详细信息

异氰酸根封端的含填料的聚氨酯预聚体(PU)与煤焦油沥青—异氰酸酯加合物(CTPA)的混合,具有引人注目的流变性能。 PU/CTPA体系经过水固化后获得类似橡胶的性质,其机械性能取决于PU/CTPA的比值,如果混合物中的CTPA的含量为20％～30％,就可以观察到出乎意料的机械性能最大值,这可能是这些产物的特别结构所致。试验结果表明,PU/CTPA混合物可用作汽车和建筑行业中的密封剂或涂料。

关键词：聚氨酯橡胶聚氨酯改性煤焦油沥青

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