汉语口语开放性试题计算机自动评分的效度验证

计算机自动评分优势诸多,发展势头迅疾,将这一技术引入到实评之中,须对其效度进行论证。本研究依据Williamson等在2012年提出的计算机自动评分效度论证框架,对2016年11月我国新疆地区中国少数民族汉语水平等级考试(MHK)口语考试的实测数据进行了计算机自动评分的效度验证,结果显示:依据该框架对口语开放性试题计算机自动评分进行效度验证是可行的,MHK口语开放性试题的计算机自动评分与人工评分的依据相似,与专家评分的相关系数在0.8以上,评分的一致性和稳定性较高,多项指标明显优于人工评分。     

堆栈稀疏降噪自编码网络在变压器故障诊断中的应用

为了进一步提高电力变压器故障诊断的识别能力,提出了一种基于堆栈稀疏降噪自动编码器(stacked sparse denoising auto-encoder,SSDAE)的新型深度学习电力变压器故障诊断新方法,较好地解决了传统电力变压器故障诊断方法识别率低及特征提取能力差的问题。SSDAE模型首先使用大量的无标签数据,采用逐层贪婪法进行无监督预训练;然后将模型的最后一层连接Softmax分类器,使用带有故障类型的数据进行微调;最终通过实例数据证明,与三比值法和基于支持向量机(support vector machine, SVM)算法的诊断方法对比,所提出的基于SSDAE网络的变压器故障诊断方法的准确率可提高近20%。     

汉语自动标引加权方法试验研究

本文介绍了几种自动标引加权方法,以及把这几种方法应用于汉语文献自动标引试验的情况,给出了试验的有关数据、基于数据的分析和推出的结论,并对汉语科技文献自动标引中的若干问题进行了探讨。     

基于图像处理的原生动物自动计数方法及其实现

针对一些原生动物种类在水体中不断游动难于计数的问题,采用数字图像处理技术,将连续拍摄的两幅或多幅照片,经过图像相减、增强、滤波以及二值化等图像处理技术,转换为一幅黑白图像。再使用连通区域的标号、原生动物计数和统计修正等方法,自动计算出图中的原生动物个数。该系统已被成功使用于草履虫等纤毛类原生动物的定量,得到了比人工计数更为准确和更高效的实验结果。     

A 155 Mbps laser diode driver with automatic power and extinction ratio control

An integrated laser diode driver(LDD) driving an edge-emitting laser diode was designed and fabricated by 0.35 μm BiCMOS technology. This paper proposes a scheme which combines the automatic power control loop and temperature com-pensation for modulation current in order to maintain constant extinction ratio and average optical power. To implement tem-perature compensation for modulation current,a novel circuit which generates a PTAT current by using the injecting base current of a bipolar transistor in saturation region,and alternates the amplifier feedback loop(closed or not) to control the state of the current path is presented. Simulation results showed that programmed by choice of external resistors,the IC can provide modu-lation current from 5 mA to 85 mA with temperature compensation adjustments and independent bias current from 4 mA to 100 mA. Optical test results showed that clear eye-diagrams can be obtained at 155 Mbps,with the output optical power being nearly constant,and the variation of extinction ratio being lower than 0.7 dB.     

PLC对继电器控制线路的改造

PLC是英文“ProgrammableLosicController”的缩写词,中译名为“可编程控制器”。可编程控制器是集计算机技术、自动控制技术、通信技术为一体的新型自动控制装置。其性能的优越,已被广泛地应用于工业控制的各个领域。PLC的优点：1）可靠性高,抗干扰能力强。2）适应性强,应用灵活。3）编程方便,易于使用。4）功能性强,扩展能力强。     

A prototype of workflow management system for construction design projects

1 Introduction 1 In recent years there is a growing understanding of the importance of effective design management to facilitate a coordinated building design within budget, and to ensure the smooth operation of a project [1]. Therefore, it becomes a certain tendency that management of construction design project should combine with information technology (IT) to approach information share and process integration. Since the application of computer-aided design technology (CAD) in China at la…     

Automatic generation method of geological cross-sections in dredging engineering based on 3D solid NURBS models

An automatic generation method of geological cross-sections in dredging engineering based on 3D geological solid models is presented.The 3D geological models are built applying the non-uniform rational B-splines(NURBS) technique,and a 2D profile can be calculated and generated automatically through Boolean operation to meet the demands of dredging projects.Moreover,an automatic marking method for geological attributes is put forward based on database technology,and the geological attributes include the profile name,scale,horizontal and vertical relative coordinates,geological lithology,and 2D standard lithology legend.At the same time,the automatic marking method can also provide an interactive mode for geological engineers to edit and modify the profile in the modeling system.Practical engineering applications show that the automatic generation method is a simple,flexible,fast and precise visual graphics rendering process that can create 2D standard profiles automatically and efficiently.This method also provides a convenient support tool for geological engineering digital analysis.