侧向滑步推铅球技术教学中运用双语教学法的实验研究   总被引：1，自引：0，他引：1  

王平  郑兵  王延奇 《首都体育学院学报》2003,15(3):70-71

作者运用双语教学在体育教育专业侧向滑步推铅球技术教学中进行了教学尝试，通过对教学后实验组与对照组在技评和达标两项考核指标的统计分析，提出双语教学法运用于铅球技术教学中是可行的，同时，对运用双语教学的方法作了简述。  相似文献   

构建网络安全防护体系   总被引：1，自引：0，他引：1  

侯立志 《承德职业学院学报》2004,9(4):74-76

随着计算机技术和通信技术的发展,计算机网络将日益成为工业、农业和国防等方面的重要信息交换手段,渗透到社会生活的各个领域.网络安全问题日益突出,为了提高网络的整体安全水平必须全方位的构建网络安全防护体系,本文介绍网络安全防护体系的构建过程,并描述网络安全防护体系结构.  相似文献   

时滞脉冲双曲型泛函微分方程解的振动性     

薛秋条  张玉兰 《洛阳师范学院学报》2005,24(2):18-20,101

本文研究脉冲双曲型泛函微分方程解的振动性质,给出了解振动的充分条件.  相似文献   

A color image segmentation method as used in the study of ancient monument decay     

Rossella Cossu  Laura Chiappini 《Journal of Cultural Heritage》2004,5(4):385-391

In the cultural heritage area, it is of fundamental importance to characterize and classify the conservation state of the materials constituting ancient monuments, in order to study and monitor their decay. Generally, the decay diagnosis is provided by “naked eye” analysis done by expert scientists “walking around” the artifact and recording the conservation state of each individual element they observe. In this paper, a color image segmentation approach, based on histogram threshold and edge detection techniques is presented, to extract degradation regions, characterized by holes or cavities, from color images of stone-materials. The goal is to provide an aid to the decay diagnosis by segmenting degraded regions from color images, computing quantitative data, such as the area and perimeter of the extracted zones, and processing qualitative information, such as various levels of depth detected into the same zones. Since color is a powerful tool in the distinction between objects, a segmentation technique based on color, instead of intensity only, has been used to provide a clearer discrimination between regions. The study case concerns the impressive remains of the Roman Theatre in the city of Aosta (Italy). In particular, we have processed and analyzed some color images of the theatre puddingstones, acquired by a camera.  相似文献   

金属焊接质量的红外成像检测     

王景中  徐小青 《上海海事大学学报》2001,22(3):214-216

介绍一种基于红外成像技术的金属焊接质量的无损检测方法.首先介绍了检测的基本原理和检测装置,然后详细给出了以边缘检测为基础的缺陷检测方法及检测结果.最后通过比较说明,利用红外成像技术对金属焊接质量进行无损检测是一种很有效的方法.  相似文献   

网络视频监控产品测试方案的改进设计     

蔡逆水  彭明星 《河北软件职业技术学院学报》2005,7(3):51-52,55

网络视频监控产品入网检测的关键在于采用的测试策略和测试方法。本文提出了验收该类产品的测试方案和测试策略，并以“守望精灵”网络视频监控平台为实例，对重要指标的测试用例进行了改进设计。实践证明改进后的方案具有较高的测试稳定性和较小的测试误差等优点。  相似文献   

一类二阶泛函边值问题正解的存在性     

沈文国 《天水师范学院学报》2006,26(2):10-11

讨论方程u″ h(t)f(u)=0在边界条件u'(0)=1乙0b(t)u'(t)dt,u(1)=t0乙0a(t)u(t)dt-1乙t0a(t)u(t)dt下正解的存在性,给出了该问题至少存在一个正解的存在性定理。  相似文献   

馆藏特色数字资源众包对图书馆核心能力及组织边界的影响研究     

黄婧  王琼 《图书馆》2022,(2)

文章以企业能力与组织边界相关研究成果为指导,结合目前已成功实施的部分图书馆众包案例,对馆藏特色数字资源的规划、建设与服务过程展开分析研究。文章认为馆藏特色数字资源众包不仅利于增强图书馆建设数字特藏的能力,也有利于提升馆员专业能力、提高用户满意度、提升图书馆知识服务与创新能力,进而增强图书馆核心能力,不断扩大组织边界。最后文章提出图书馆需重新审视功能定位,确保核心能力与竞争优势,真正服务于知识经济和现代信息社会的建设。  相似文献   

基于双目点云的三维物体检测准确性分析     

刘王超  娄鑫 《中国科学院大学学报》2022,39(5):677-683

双目相机虽然能通过算法生成密集的深度数据,但其在精度上与激光雷达生成的深度数据有着较大的差距,特别是在纹理不明显的区域。针对这种现象,尝试使用激光雷达的精确点云来排除由双目相机产生的pseudo-LiDAR数据中与之差别较大的部分点,然后将优化后的pseudo-LiDAR用以进行三维物体检测。实验结果显示,将pseudo-LiDAR数据中的不准确点（坏点）排除,有助于提高检测准确率,最多可提高21.02%。因此,如何不依赖激光雷达数据来排除pseudo-LiDAR点云中的坏点是进一步提高双目相机系统检测准确率的关键。  相似文献   

Placing Facebook     

Brett G. Johnson  Kimberly Kelling 《Journalism Practice》2018,12(7):817-833

Facebook is challenging professional journalism. These challenges were evident in three incidents from 2016: the allegation that Facebook privileged progressive-leaning news on its trending feature; Facebook’s removal of the Pulitzer Prize-winning “Napalm Girl” photo from the pages of prominent users; and the proliferation of “fake news” during the US presidential election. Using theoretical concepts from the field of boundary work, this paper examines how The Guardian, The New York Times, Columbia Journalism Review and Poynter editorialized Facebook’s role in these three incidents to discursively construct the boundary between the value of professional journalism to democracy and Facebook’s ascendant role in facilitating essential democratic functions. Findings reveal that these publications attempted to define Facebook as a news organization (i.e., include it within the boundaries of journalism) so that they could then criticize the company for not following duties traditionally incumbent upon news organizations (i.e., place it outside the boundaries of journalism). This paper advances scholarship that focuses on both inward and outward conceptions of boundary work, further explores the complex challenge of defining who a journalist is in the face of rapidly changing technological norms, and advances scholarship in the field of media ethics that positions ethical analysis at the institutional level.  相似文献