中国英语能力等级量表口译能力描述语分级验证研究

本文聚焦中国英语能力等级量表口译能力描述语的分级定量验证和定性验证。基于多面Rasch模型的效度验证结果表明,口译能力描述语拟合度和区分度较好,描述语级别能在一定程度上体现不同等级的口译能力。在两次验证结果的基础上,口译能力描述语经历了多轮修改与调整,确保描述语术语统一、表述清晰,描述语的级别代表性得到优化。

中国英语能力等级量表中句法量表的构建——基于句法区别性特征的方法

中国英语句法能力等级量表研制组在建立描述语库的过程中发现,已采集到的句法描述语存在数量不足、可解释性差及对特定水平学习者应掌握的句法特征界定不清等问题。研制组从以往二语习得研究中提取句法区别性特征,基于我国英语学习者语料库观察这些区别性特征在真实语言使用样本中的分布情况,并对比分析不同水平群体的句法错误变化规律,在撰写句法描述语时注重突出不同水平学习者应掌握的最典型、最重要的句法特征,反映不同阶段学习者的句法知识掌握及运用情况。基于大规模问卷调查对描述语进行分级验证后发现,使用这种方法构建的句法量表数据分析结果良好,量表建设时专家基于区别性特征对描述语的定级与问卷调查定级结果高度吻合。

某型导弹虚拟样机验模与仿真

为辅助导弹武器系统的研制,采用虚拟样机技术对某型导弹系统建模并对模型进行验证。介绍某型导弹虚拟样机的总体结构,提出对仿真模型进行校验的方法:把模型校验作为一个过程,采用分级验证,由子模型到程控弹模型,再到制导回路模型,逐步进行校验。对该型导弹虚拟样机进行验模的结果表明:经过校验的模型既能预测弹道的性能,又能对试验中出现的问题进行复现和分析,为后续的导弹系统仿真及性能评估奠定了基础。

Development of Multilevel Meteorological Data Acquisition System for Radiation Emergency Decision Support

This paper describes a development of multilevel meteorological data acquisition system implemented at Kalpakkam coastal site for atmospheric dispersion and model validation studies. Meteorological data are one of the most important inputs into any air dispersion model. As a part of atmospheric dispersion modeling studies and developing a methodology to forecast the site-specific dispersion characteristics, the real time monitoring of meteorological parameters assumes significance. This is achieved by erecting met towers instrumented at multilevel and single level at different locations with sensors for measuring various meteorological parameters. Real-world data logging applications involve not only just acquiring and recording signals, but also combination of offline analysis, display, report generation and data sharing. This paper covers development of low cost compact MMDAS （modular meteorological data acquisition system）, its performance evaluation, field deployment test and data comparison analysis with fast response and high accuracy internationally acclaimed sonic anemometer. The system is based on embedded modules from Advantech and is designed to acquire analogue and digital signals from a multilevel instrumented met tower. The collected data are transferred from remote base station to central server for storage and further processing using wireless interface. MMDAS has many advantages like cost effectiveness, less complex signal conditioning electronics and easy maintenance. This system has good application during radiation emergency as well as site specific meteorological data collection and model validation studies.

区域地质灾害易发性分级方法对比分析研究

地质灾害不仅造成了严重的经济损失和生态破坏,同时也威胁着人类的生存。地质灾害易发性评价是地质灾害风险评价的基础,以往的研究中重在探讨易发性评价方法的选取,而对于地质灾害易发性指数如何分级的研究较少。为了探索地质灾害易发性评价精度验证与定量的分级标准,以四川省汶川县为例,选取12种广泛应用的地质灾害易发性影响因子,运用信息量模型进行易发性评价,运用成功率曲线检验模型的评价精度,提出历史地质灾害累计比例分段法,并与其他8种分级方法进行对比分析与分级精度验证。研究结果表明,用验证样本成功率曲线与非灾害点样本成功率曲线两种方法检验模型评价精度确定了评价模型预测结果的合理性。历史地质灾害累计比例分段法在易发性分级面积比例精度验证、地质灾害频率比分级精度验证与发生地质灾害位置分级精度验证3种方式中均显现出较好的合理性,在9种分级方法中为最优分级标准。