国内外网络舆情数学建模研究综述

互联网技术的发展及网络应用的普及使网络舆情成为当前一个热门的研究领域。众多学者从不同角度运用不同的数学方法对网络舆情进行了研究,取得了大量成果,涌现出大批文献。本文从数学建模的视角对部分国内外网络舆情的研究文献进行归类分析。按照网络舆情中不确定性因素的数学处理方法不同,将网络舆情数学建模的模型主要分为四类。即经典数学模型、随机数学模型、不确定数学模型、其它数学模型。结合现有网络舆情数学建模中存在的问题,本文对网络舆情相关研究的未来发展趋势进行了展望。     

区域科技创业生态系统运行机制及政策仿真研究

结合复杂系统理论和科技创业理论构建了区域创业生态系统的多Agent模型,该模型通过各类科技创业相关Agent行为之间的交互作用模拟区域科技创业生态系统的演化规律,应用Netlogo对模型进行仿真,通过改变政策工具变量和各类Agent属性参数观察区域科技企业数量的变化,然后对仿真结果进行分析。研究结果发现:(1)创业政策实施需要一定的时间,急功近利的措施可能会破坏科技创业生态系统的正常运行。(2)中介服务机构和创业金融机构数量的增加有利于促进区域科技创业活动。(3)政府对PE/VC等金融机构的风险补偿优于对科技创业家的直接补贴。(4)良好的创业教育和区域产学研合作网络有利于区域科技创业生态系统的良性发展。     

3DGIS在烟草农田管理中的应用及发展

伴随着计算机技术和GIS技术的发展,GIS技术在越来越多的行业中得到应用。介绍了三维地理信息系统（3DGIS）在烟草农田管理中的应用,展望了3DGIS在烟草农田管理中的应用前景,如结合GPS和RS技术,模拟烟草生长、烟草生产管理决策等,以提高烟草的产量。     

六盘水师范学院数学建模参赛历程及其思考

数学建模是运用数学知识、思想和方法解决实际问题的过程。回顾六盘水师范学院在全国大学生数学建模参赛历程的基础上,提出了扩大信息宣传、加强师资培训、扩充参赛人员、科学安排培训时间及培训内容、发挥团队作用、改革课程设置、改善实验条件、健全奖励机制等建议,提高师生数学建模意识和能力,提升学院的办学品味和知名度。     

素描教学“造型密码”的探析——以人物头像为例

素描作为一门伟大的艺术,几乎蕴含造型艺术的全部秘诀,人类从古代涂鸦开始就一直试图接近秘诀的核心——造型密码。笔者以数十年素描研究和素描教学为基础,将头像素描造型中探索到的“造型密码”以文字方式叙述,从线性密码、结构密码、光影密码三个方面进行探析。     

基于HLM模型的阅读素养影响效应研究 ——以我国四省市PISA 2018阅读素养数据为例

【目的/意义】阅读素养作为人类语言发展和认识世界的重要途径,越来越引发全球的关注,对影响阅读素 养的因素及其机理进行探讨,有利于促进学生阅读能力的发展,为我国推行卓越阅读教育提供有效路径。【方法/过 程】本研究基于教育生产力心理学理论,依托全球权威的大规模学生素养的国际测试——国际学生评估项目（Pro? gramme for International Student Assessment,简称 PISA）中的阅读素养数据库,采用多层线性模型（Hierarchical Lin? ear Modeling,简称 HLM）为研究方法,从多维度对我国四省市 361所学校 11,993名的阅读素养数据进行分析。【结 果/结论】研究结果表明学习者个人能力、教学情况以及社会心理因素均对阅读素养有显著影响,且不同因素对阅 读素养影响效应不同。【创新/局限】本研究通过学生个体因素和学校环境不同层级数据间的联合效应和多维影响, 分析影响我国四省市学生阅读动态发展的因素,较为准确地还原了阅读教育系统的全貌,促进我国阅读教育质量 和教育治理能力的提升。     

关于3DS MAX建模技术及其优化的研究

三维建模是开发虚拟现实产品的过程中重要技术之一。在虚拟场景进行构造时,建模技术的日渐成熟已使得建模手段逐渐丰富,加之工具的辅助作用,也使得当前建模出现了众多版本与技术类型。文章在分析建模手段的基础上,针对3DS MAX建模技术进行了综合介绍,并在研究建模过程中的优化问题时,重点对模型优化技术展开了论述,以期能有效发挥3DS MAX建模技术的功能,促使模型的利用效率得到提升。     

独立学院数学建模培训模式的探索与改革

随着独立学院的蓬勃发展,独立学院报名参加数学建模竞赛的队伍越来越多,但很多学院的成绩不理想。本文从数学建模的培训模式这方面出发,根据近几年的实践,总结了教改的经验,提出了一套有效的培训模式。     

Computational fluid dynamics (CFD) modeling of microclimate for salts crystallization control and artworks conservation

Many deterioration processes are linked to unsuitable microclimatic condition in cultural buildings. One of the most diffused processes is soluble salts crystallization that can be accelerated in masonry structures within specific microclimatic values for different chemical compounds. In this paper, microclimate and efflorescence diffusion were monitored over a one-year period in the Crypt of the Cathedral of Lecce (South Italy). This allowed to relate the microclimate with the efflorescence variation over time. A three-dimensional computational fluid dynamics (CFD) model was then developed to detail the thermo-hygrometric parameters and airflow patterns responsible for salts crystallization and artworks deterioration. Two main conditions were reproduced; one to simulate the current microclimate, which simulations showed to be inadequate for conservation, and the other to search for a more appropriate solution. In both cases, summer and winter conditions were simulated and compared to find a microclimate able to ensure more suitable thermo-hygrometric intervals required by the constituting artworks materials. The results helped to suggest actions to improve maintenance of the Crypt.     

Childhood trauma and neighborhood-level crime interact in predicting adult posttraumatic stress and major depression symptoms

Previous research has identified several individual-level factors that modify the risk of childhood trauma on adult psychiatric symptoms, including symptoms of major depression (MD) and posttraumatic stress (PTS). Neighborhood-level factors also influence the impact of individual-level exposures on adult psychopathology. However, no prior studies to our knowledge have explored cross-level interactions between childhood trauma and neighborhood-level factors on MD and PTS symptoms. The purpose of this study was therefore to explore cross-level interactions between a neighborhood-level factor – neighborhood-level crime – and childhood trauma on MD and PTS symptoms. Participants in this study (N = 3192) were recruited from a large public hospital, and completed self-report inventories of childhood trauma and MD and PTS symptoms. Participant addresses were mapped onto 2010 census tracts, and data on crime within each tract were collected. Multilevel models found a significant cross-level interaction between childhood trauma and neighborhood crime on MD symptoms, such that the influence of high levels of childhood trauma on MD symptoms was enhanced for participants living in high-crime neighborhoods. Supplementary analyses found variation in the strength of cross-level interaction terms by types of childhood trauma and crime, with the strongest associations including emotional neglect paired with personal and property crime. The results provide preliminary support for interventions that help childhood trauma survivors find housing in less vulnerable neighborhoods and build skills to cope with neighborhood crime.