网络环境下提高大学生自主学习能力的方法

近年来,随着网络技术的不断发展和普及,自主学习能力在大学生自我发展中的重要性被大家所关注,如何提高大学生自主学习能力已经成为各高校教学研究的重要课题.本文分析了网络环境下自主学习的特点,提出了端正大学生自主学习态度,激发其内在学习动机,培养独立精神和合作精神,重视教师的监督作用等具体的方法,希望对大学生自主学习能力的提高有一定的借鉴和指导意义.     

基于Moodle研究型学习平台的需求调查分析

对某高校基于Moolde研究型学习平台的需求进行调查,探讨基于Moodle平台进行研究型学习的必要性。     

基于改进YOLO-Pose的复杂环境下拖拉机驾驶员关键点检测

为解决农田复杂作业环境下拖拉机驾驶员因光照、背景及遮挡造成的关键点漏检、误检等难识别问题,该研究提出了一种基于改进YOLO-Pose的复杂环境下驾驶员关键点检测方法。首先,在主干网络的顶层C3模块中嵌入Swin Transformer编码器,提高遮挡状况下关键点的检测效率。其次,采用高效层聚合网络RepGFPN作为颈部网络,通过融合高层语义信息和低层空间信息,增强多尺度检测能力,同时在颈部网络采用金字塔卷积替换标准3×3卷积,在减少模型参数量的同时有效地捕获不同层级的特征信息。最后,嵌入坐标注意力机制优化关键点解耦头,增强预测过程对关键点空间位置的敏感程度。试验结果表明,改进后算法mAP_0.5(目标关键点相似度L_oks阈值取0.5时平均精度均值)为89.59%,mAP_0.5:0.95(目标关键点相似度L_oks阈值取0.5,0.55,···,0.95时的平均精度均值)为62.58%,相比于基线模型分别提高了4.24和4.15个百分点,单张图像平均检测时间为21.9 ms,与当前主流关键点检测网络Hou...     

Failure of predator conditioning: an experimental study of predator avoidance in brown trout (Salmo trutta)

Many studies have documented that hatchery‐reared salmonids generally have inferior survival after being stocked compared with wild conspecifics, hatchery and wild salmonids have been observed to differ in their antipredator responses. The response of brown trout (Salmo trutta) juveniles (0+) of differing backgrounds to a live predator was compared in two experiments. First, the antipredator behaviour of predator‐naïve hatchery‐reared brown trout and wild‐exposed brown trout were assessed in behavioural trials which lasted for eight days. Second, predator‐naïve and predator‐conditioned hatchery‐reared brown trout were assessed in identical behavioural trials. Brown trout were ‘predator‐conditioned’ by being held in a stream‐water aquarium with adult Atlantic salmon (Salmo salar) and adult brown trout for two days prior to behavioural trials. Predator‐conditioned hatchery‐reared brown trout spent more time in shelters in the trial aquaria than predator‐naïve hatchery‐reared fish, but did not differ in time spent in the predator‐free area. Predator conditioning may account for the increased time spent in the shelter, but does not appear to have affected time spent in the predator‐free area. However, even if significant alteration in behaviour can be noted in the laboratory, the response might not be appropriate in the wild.     

现代远程教学平台的安全性研究

安全性是现代远程教学中的一个重要研究方向，本文主要讨论如何从访问策略、入侵检测策略以及访问控制策略等方面来保障现代远程教学平台的安全。     

Urban forest park use and psychosocial outcomes: A case study in six cities across South Korea

Abstract

Urban forest parks provide a wide range of experience outcomes to visitors. However, there is too little scientifically documented knowledge of the outcomes of the use. This study was conducted to identify visitors' psychosocial outcomes from urban forest park use, and to examine whether or not the visitors' psychosocial outcomes were related to some personal variables. Structured surveys were conducted with 2292 urban forest park visitors in six cities across South Korea during the summer and autumn of 2003. Examination of park experience outcomes revealed that there were three factors of outcomes: “learning and self/other relations”, “social and self-development” and “enjoying nature”. The results also indicated that older and more highly educated visitors were more likely to rate the outcomes as important than those who were younger and less educated. There were no significant differences in the outcomes between male and female visitors.     

以实事求是推动学习型党组织建设的理论思考

为了能够更好地完成建设学习型政党的战略目标,从中国共产党思想路线的内生性深度对学习型党组织建设问题进行了探讨。分析认为,实事求是不仅是中国共产党的思想路线,更是建设学习型党组织的思想和方法论基础,坚持实事求是的思想路线,就是坚持正确的思想方向和建设方法。此路线不仅指明了学习型党组织建设的立足点和客观基础,还提供了学习型党组织建设的检验尺度和现实归宿。     

利用教室文化促进学生交流探讨

教室文化的建设,要以促进学生全面交流、共同发展为目的,依据学校教学文化和学生的个性特征而定.一般都以墙面文化的建设、多元学习空间策略、课桌文化策略、人文关怀策略等方面来进行建设,使学生在潜移默化中学到知识、培养能力.     

采用改进的YOLOv5s检测花椒簇

为实现花椒簇的快速准确检测,该研究提出了一种基于改进YOLOv5s的花椒簇检测模型。首先,使用MBConv(MobileNetV3 block convolution,MBConv)模块和基于ReLU的轻量级自注意力机制优化了EfficientViT网络,用其代替YOLOv5s的主干,减少模型的参数量、增强模型对重要特征的表达能力。其次,在模型的训练过程中采用了OTA(optimal transport assignment)标签分配策略,优化训练中的标签分配结果。最后,使用WIoU损失函数对原损失函数CIoU进行替换,提高锚框的质量。试验结果表明,改进YOLOv5s模型的平均准确度均值(mean average precision,mAP)为97.3%、参数量为5.9 M、检测速度为131.6帧/s。相较于YOLOv5s模型,mAP提升1.9个百分点、参数量降低15.7%、检测速度提高14.5%。结果表明,该研究提出的改进YOLOv5s模型准确度高、参数量低、检测速度快,可实现对花椒簇的有效检测。     

长江中游宜昌至嘉鱼江段鳊食性研究

研究鳊(Parabramispekinensis)的摄食特征,为长江中游鳊资源的保护提供基础数据支撑。2016年9月至2017年8月在长江中游宜昌、荆州和嘉鱼江段使用三层流刺网进行了季度采样,对鳊肠含物的种类组成及时空差异进行分析。共采集鳊样本213尾,体长14.5～38.0 cm、体重67.0～978.1 g,其中肠道有食物的样本182尾。结果显示:在宜昌、荆州和嘉鱼江段,鳊全年摄食,且摄食强度存在明显季节变化。鳊充塞度以夏季最高、冬季最低;其中夏季肠道充塞度最高为5级,2、3级占52.42%;冬季最高为3级,0、1级占58.82%;春季和秋季最高充塞度均为4级,分别以1级、2级为主;鳊夏季摄食率最高(92.23%),略高于秋季(88.37%),明显高于春季(78.79%)和冬季(67.65%)。饵料生物主要为水生植物和浮游植物,其中浮游植物以颗粒直链藻(Melosira granulata)、变异直链藻(Melosira varians)和粗壮双菱藻(Surirella robusta)为优势种群。饵料生物种类组成在不同江段无明显差异,但呈现明显的季节变化,冬季以浮游植物出现率最高(100.00%),其他季节均以水生植物碎片出现率最高。建议在航道整治等涉水工程建设时,注重保护水生维管束植物及浮游植物,以保护鳊等草食性鱼类的饵料生物来源。