基于物联网电梯接口协议关键技术研究及应用

针对当前不同电梯厂家提供的接口协议不同,电梯监测和管理不统一的状况,提出了基于物联网电梯通用接口协议转换装置这一关键技术.该技术的提出,可以实时在线监测电梯设备运行状态和故障情况并实现预报警作用,解决电梯接口协议之间的转换,实现电梯信息传输自组网功能,有助于电梯监测、管理一体化平台的建设.     

Relationship Between Interfacial Water Layer Adhesion Loss of Silicon/Glass Fiber-Epoxy Systems: A Quantitative Study

Water at the polymer/substrate interface is often the major cause of adhesion loss in coatings, adhesives, and fiber-reinforced polymer composites. This study critically assesses the relationship between the interfacial water layer and the adhesion loss in epoxy/siliceous substrate systems. Both untreated and silane-treated Si substrates and untreated and silane-treated E-glass fibers were used. Thickness of the interfacial water layer was measured on epoxy/Si systems by Fourier transform infrared-multiple total internal reflection (FTIR-MTIR) spectroscopy. Adhesion loss of epoxy/Si systems and epoxy/E-glass fiber composites was measured by peel adhesion and short-beam shear tests, respectively. Little water accumulation at the epoxy/Si substrate interface was observed for silane-treated Si substrates, but about 10 monolayers of water accumulated at the interface between the epoxy and the untreated Si substrate following 100 h of exposure at 24 °C. More than 70% of the initial epoxy/untreated Si system peel strength was lost within 75 h of exposure, compared with 20% loss after 600 h for the silane-treated Si samples. Shear strength loss in composites made with untreated E-glass fiber was nearly twice that of composites fabricated with silane-treated fiber after 6 months of immersion in 60 °C water. Further, the silane-treated composites remained transparent, but the untreated fiber composites became opaque after water exposure. Evidence from FTIR-MTIR spectroscopy, adhesion loss, and visual observation strongly indicated that a water layer at the polymer/substrate interface is mostly responsible for the adhesion loss of epoxy/untreated siliceous substrate systems and epoxy/untreated glass fiber composites and that FTIR-MTIR is a viable technique to reliably and conveniently assess the adhesion loss attributable to water sorption at the interface.     

Advancements in the design and validation of an air pollution integrated assessment model for Spain

This paper describes the design and application of the Atmospheric Evaluation and Research Integrated model for Spain (AERIS). Currently, AERIS can provide concentration profiles of NO₂, O₃, SO₂, NH₃, PM, as a response to emission variations of relevant sectors in Spain. Results are calculated using transfer matrices based on an air quality modelling system (AQMS) composed by the WRF (meteorology), SMOKE (emissions) and CMAQ (atmospheric-chemical processes) models. The AERIS outputs were statistically tested against the conventional AQMS and observations, revealing a good agreement in both cases. At the moment, integrated assessment in AERIS focuses only on the link between emissions and concentrations. The quantification of deposition, impacts (health, ecosystems) and costs will be introduced in the future. In conclusion, the main asset of AERIS is its accuracy in predicting air quality outcomes for different scenarios through a simple yet robust modelling framework, avoiding complex programming and long computing times.     

The viscoplastic properties of crude oil-water interfaces

The breaking of water-in-crude oil emulsions is a major challenge in the conventional petroleum industry, while oil-in-water emulsions present similar issues in commercial oilsands extraction processes. The stability of these emulsions can be attributed to complex rheological properties of the crude oil-water interface. Novel micromechanical techniques are developed that allow direct measurements of interfacial behaviour of emulsion drops. In these techniques, individual emulsion drops are elongated using micropipettes, where one micropipette is shaped into a cantilever for force measurements. As such, the surface behaviour of a drop is recorded in stress-strain experiments. In an alternative technique, the extended drop is released from a micropipette, and its natural, tension-driven relaxation is observed.The surface behaviour of bitumen (a heavy crude oil) emulsion drops in aqueous environments, that include dissolved calcium ions and suspended montmorillonite clays, is studied. The plasticity and other surface properties of these bitumen drops are discussed. A simple, lumped-parameter model is developed to describe the recovery of a bitumen drops to their final non-spherical shapes.     

《计算机接口编程技术》教学改革的实施研究

《计算机接口编程技术》是我系重要的一门专业基础课,本文主要阐述了该门课程在教学内容、教学方法与手段以及课程考核方式改革中的具体实施情况以及存在的创新点。     

基于TMS320VC5402的RS_485通信设计

完成了基于TMS320VC5402 DSP的R5_485通信的硬件设计和软件编程.基于美国TI公司TMS320VC5402 DSP芯片的多通道缓冲口(McBSP)进行适当的硬件扩展,以SPI方式直接和MAXIM公司的MAX3100通用异步串行收发器接口,然后经Linear Technology公司的LTC 1480超低...     

基于动态行为和机器学习的恶意代码检测方法

目前恶意代码出现频繁且抗识别性加强,现有基于签名的恶意代码检测方法无法识别未知与隐藏的恶意代码。提出一种结合动态行为和机器学习的恶意代码检测方法。搭建自动化分析Cuckoo沙箱记录恶意代码的行为信息和网络流量,结合Cuckoo沙箱与改进DynamoRIO系统作为虚拟环境,提取并融合恶意代码样本API调用序列及网络行为特征。在此基础上,基于双向门循环单元（BGRU）建立恶意代码检测模型,并在含有12 170个恶意代码样本和5 983个良性应用程序样本的数据集上对模型效果进行验证。实验结果表明,该方法能全面获得恶意代码的行为信息,其所用BGRU模型的检测效果较LSTM、BLSTM等模型更好,精确率和F1值分别达到97.84%和98.07%,训练速度为BLSTM模型的1.26倍。     

融合代码与文档的软件功能特征挖掘方法

在软件复用过程中,简洁清楚的软件功能自然语言描述是帮助复用者快速了解待复用软件项目/代码库的前提和基础.但当前开源软件往往缺乏高质量的软件功能说明文档,使得这一过程变得更加复杂和困难.为此,本文提出了一种融合代码与文档的软件功能特征挖掘方法.该方法以动宾短语的形式描述软件功能特征,通过迭代挖掘软件源代码和以Stack Overflow讨论帖为代表的软件文档,自动提取开源软件的功能特征描述,并构造了层次化的软件功能特征视图.在针对多个开源软件项目的实验中,本文方法可覆盖官方文档中列举的95.38%的软件功能.挖掘结果中语句和功能特征的准确率分别达到了93.78%和92.57%.对比现有工作TaskNav和APITasks,本文方法在平均准确率上分别提升了28.78%和11.56%.     

基于ERP信号的目标检测研究综述

目标检测技术应用广泛,现有的基于计算机视觉的目标检测方法由于目标遮挡、光照强弱等因素难以适应复杂场景的需求。而人脑的高级认知能力和快速感知能力在处理复杂情况时具有一定的优势。基于事件相关电位（Event-Related Potentials,ERP）的脑机接口（Brain Computer Interface,BCI）系统与特定事件相关,可检测独立于自发脑电的高级认知活动,是当前人工智能领域的研究热点之一。针对基于ERP信号的目标检测各个环节进行了研究现状的全面归纳,梳理了以快速串行视觉呈现（Rapid Serial Visual Presentation task,RSVP）为主的实验范式,包括呈现模式、目标视场角、目标复杂度等设计因素。总结了脑电信号分析中的预处理方法、特征提取和特征分类算法,介绍了其在人脸识别、军事作战、医学分析等领域中的初步应用。探讨了目前研究中存在的问题和挑战并展望未来的研究方向与应用前景。