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激光扫描仪虚拟测方技术的测量精度分析 被引量:3
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作者 王挥云 《煤炭工程》 北大核心 2016年第10期52-55,共4页
由于已有的测量误差模型不能准确地表达激光扫描仪虚拟测方系统在空间数据采集和融合过程中的误差传播规律,在误差来源分析的基础上,研究设计了用于激光扫描仪虚拟测方系统及相似测量系统的误差传播模型,并结合实例讨论了影响测量精度... 由于已有的测量误差模型不能准确地表达激光扫描仪虚拟测方系统在空间数据采集和融合过程中的误差传播规律,在误差来源分析的基础上,研究设计了用于激光扫描仪虚拟测方系统及相似测量系统的误差传播模型,并结合实例讨论了影响测量精度的因子,得出了不同曲面构造方法的误差特征。 展开更多
关键词 激光扫描仪 虚拟测方 误差模型 误差分析
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The Effect of Integrating Inductive Approach and Deductive Approach With Multimedia Assistance Into Acquisition of Subjunctive Mood
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作者 JIANG Xin 《Sino-US English Teaching》 2012年第9期1510-1515,共6页
This study applied both inductive approach and deductive approach with multimedia assistance into an English grammar class on the acquisition of subjunctive mood. It aimed to investigate whether this kind of teaching ... This study applied both inductive approach and deductive approach with multimedia assistance into an English grammar class on the acquisition of subjunctive mood. It aimed to investigate whether this kind of teaching approach, as a general grammar pedagogy, would improve the efficiency of students' acquisition of certain grammar points. This study results from comparison and contrast between one same class on the acquisition of subjunctive mood to 70 students in total, employing three different teaching methods: inductive approach with multimedia assistance (method 1), deductive approach with multimedia assistance (method 2), and both inductive approach and deductive approach with multimedia assistance (method 3), based on self-reported reflection on the experiment, observation of students' learning process, students' pre-test and after-class evaluation test results, and surveys. Two identical experiments were conducted to two groups of students of different levels of language proficiency to increase the generalizability of the results. Findings revealed that the evaluation test score of the grammatical points taught with method 3 is much higher than those taught with the other two methods, and most students felt positive about method 3. Students nevertheless encounter obvious difficulties in inductive approach, indicating certain lack of self-learning skills in Chinese students 展开更多
关键词 inductive approach deductive approach multimedia assistance subjunctive mood grammar teaching
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