圆锥滚子轴承外凸曲线型大挡边的加工研究与实践

针对国产轻型轿车对中小型圆锥滚子轴承外凸曲线型大挡边的设计要求,介绍该类轴承大挡边中外凸曲线的加工方法.通过对30310圆锥滚子轴承进行试验加工后的检测对比发现,具有大挡边带外凸量的该类轴承较之前的直挡边轴承的振动指标合格率有明显提升.     

科技论文图表的编辑加工

图和表是现代科技文献中不可缺少的表述手段,在科技论文中所起的作用无庸赘述。依据国家相关的作者编辑常用标准及规范,结合笔者工作实际,分析了科技论文中图表不规范问题,给出图表规范化处理及审读方法,对提升编校质量有一定的帮助。     

考虑遮挡的视频车辆跟踪

为了对遮挡情况下的运动车辆进行跟踪,提出一种基于分块的车辆跟踪算法。该算法将目标车辆以可重叠的方式划分为若干大小一致的子块。在分块的基础上估计所有子块的运动矢量,检测噪声运动矢量并进行调整,以减少运动矢量估计的误差,然后对子块进行移位以实现车辆跟踪。为了处理车辆间的遮挡现象建立了马尔可夫随机场描述子块之间的关系,利用欧氏距离定义块的邻域,并基于块的直方图构建能量函数,最后利用模拟退火法对能量函数进行优化,以对遮挡区域进行分割。实验结果表明,该算法能够对遮挡车辆进行准确跟踪。     

机械加工设备布局方法研究

随着工业机械化水平的不断提升,生产制造过程机械设备效能的最大化发挥,成为生产管理和控制的重点内容。而机械加工设备布局的合理性,不仅仅是保证车间物流畅通,设备正常运转,场地面积优化的重要举措,也是实现生产管理效率提升,降低工作强度的良策。文章从这个角度出发,积极探析机械加工设备布局方式方法。     

输入加工和输出驱动下的语法教学对比研究

语法是语言的基本组成部分,语法能力决定着语言使用者的语言能力,如何使外语学习者更好地掌握语法是外语教学的核心问题。目前语法教学的方法主要分为两大类,一类研究强调语言输入,另一类研究则侧重语言输出。该文旨在分析国内外语法教学研究,比较语法教学手段及其习得效果的差异,认为外语语法教学的输入加工型教学法和意义型输出教学法的效果有待于课堂教学实证研究来进一步论证。     

The eye-mind of processing written feedback: Unraveling how students read and use feedback for revision

This research aims to promote our understanding of feedback engagement processes in writing tasks using a combination of online and offline measures, including eye-tracking, thinking-aloud, and text-analyses. Study 1 explored how sixteen students read, evaluate, and use feedback for revision. Results revealed three feedback processing strategies: (1) superficial processing (n = 6), which is characterized by reading feedback in a linear way, without critically rereading or revising the text, (2) local processing (n = 6) in which students switched between reading the comments and the commented text, and (3) deep processing (n = 4) in which students integrated the feedback with both commented and uncommented parts of the text and made more substantial revisions. In Study 2, we investigated the local and deep feedback reading strategy in more detail with 41 students using a within-subject design with different types of feedback. Results demonstrated the same strategies among students, but also that the focus of feedback affected students' revision behavior, above and beyond an individual feedback processing strategy. This finding is in line with previous research that emphasized the effects of feedback characteristics on students’ use of feedback. By triangulating various process measures, this research is one of the first that provides empirical evidence for different feedback processing strategies among students. These novel insights in individual feedback engagement processing can be used to extend and refine current theories on how, when, and why feedback works and for whom.     

数字图像处理技术的综述及其未来发展

本文简述了数字图像的一些基本概念,系统地分析了目前较为成熟的数字图像处理的常用方法、计算机软件开发平台及其应用领域,并提出了数字图像的未来发展方向。     

Revisiting Cross-document Structure Theory for multi-document discourse parsing

Multi-document discourse parsing aims to automatically identify the relations among textual spans from different texts on the same topic. Recently, with the growing amount of information and the emergence of new technologies that deal with many sources of information, more precise and efficient parsing techniques are required. The most relevant theory to multi-document relationship, Cross-document Structure Theory (CST), has been used for parsing purposes before, though the results had not been satisfactory. CST has received many critics because of its subjectivity, which may lead to low annotation agreement and, consequently, to poor parsing performance. In this work, we propose a refinement of the original CST, which consists in (i) formalizing the relationship definitions, (ii) pruning and combining some relations based on their meaning, and (iii) organizing the relations in a hierarchical structure. The hypothesis for this refinement is that it will lead to better agreement in the annotation and consequently to better parsing results. For this aim, it was built an annotated corpus according to this refinement and it was observed an improvement in the annotation agreement. Based on this corpus, a parser was developed using machine learning techniques and hand-crafted rules. Specifically, hierarchical techniques were used to capture the hierarchical organization of the relations according to the proposed refinement of CST. These two approaches were used to identify the relations among texts spans and to generate multi-document annotation structure. Results outperformed other CST parsers, showing the adequacy of the proposed refinement in the theory.     

面向集团企业的商业智能系统构建研究

概述了商业智能的涵义及实现过程,在分析集团企业的商业智能需求及模式的基础上,以中石油某集团公司为例,提出了一个面向集团企业的具体的完整的商业智能解决方案.