上市公司文本信息披露智能分析研究综述

对上市公司发布的文本信息披露进行分析是投资者了解公司经营状况、做出投资决策的重要途径,然而人工阅读和分析的方法存在效率低、成本高等问题。人工智能技术的发展则为文本信息的智能分析提供了契机,能够从海量企业文本数据中挖掘有价值的信息,充分发挥数据驱动的优势,大幅度提高分析效率,成为近些年的研究热点。对近十年关于上市公司文本信息披露智能分析的研究工作进行了总结,分别从文本信息披露的事件类型的研究现状、智能分析方法和应用场景三个方面进行了归纳,分析了该领域当前面临的挑战,最后根据现有方法的不足指出了未来可能的研究方向。     

多核DSP软件调试环境研究与设计

针对武器装备嵌入式系统向自主化、智能化、小型化、低功耗快速发展的趋势,介绍了装备研制对自主多核处理器及其软件调试环境的迫切需求,分析了嵌入式系统远程调试的基本原理和特点、JTAG标准和边界扫描技术。以自主同构8核数字信号处理器为目标平台,基于目标平台JTAG控制器之间的菊花链连接方式,提出了面向该目标平台的软件调试环境设计方案,讨论了USB接口仿真器软硬件设计和多线程调试代理软件设计等关键技术。实现的软件调试环境能够在调试主机上对目标平台进行指令级和源码级交叉调试,解决了目标平台缺乏配套软件调试手段的实际问题,为目标平台在武器装备上的推广应用提供了有力支撑,对其他面向多核处理器的调试环境设计具有参考价值。     

Effects of thermal treatment on physical and mechanical characteristics of coal rock

To study the physical and mechanical properties of coal rock after treatment at different temperatures under impact loading, dynamic compression experiments were conducted by using a split Hopkinson pressure bar(SHPB). The stress–strain curves of specimens under impact loading were obtained, and then four indexes affected by temperature were analyzed in the experiment: the longitudinal wave velocity, elastic modulus, peak stress and peak strain. Among these indexes, the elastic modulus was utilized to express the specimens' damage characteristics. The results show that the stress–strain curves under impact loading lack the stage of micro-fissure closure and the slope of the elastic deformation stage is higher than that under static loading. Due to the dynamic loading effect, the peak stress increases while peak strain decreases. The dynamic mechanical properties of coal rock show obvious temperature effects. The longitudinal wave velocity, elastic modulus and peak stress all decrease to different extents with increasing temperature, while the peak strain increases continuously. During the whole heating process, the thermal damage value continues to increase linearly, which indicates that the internal structure of coal rock is gradually damaged by high temperature.     

High-voltage surge protection by a varistor-filled air gap

The electric discharge across a varistor granule filled air gap under a fast-rising voltage pulse was investigated for surge protection applications. The effects of temperature and pressure on the arc and the electrical conduction were analyzed by the characteristic changes in voltage waveforms triggered by a fast-rising high voltage pulse. In addition to the gap size, experimental results show that competing mechanisms among arc conduction, conduction through the varistor granule network, thermionic emission from Joule heating at granule-to-granule contact points, and the magnitude of the switching voltage dictate the maximum surge protection voltage for the filled air gap. Experimental evidence indicated that accumulated degradation was created at small contact points between varistor granules by repetitive assaults from longer duration, high voltage pulses. The uniqueness of using varistor over other dielectric granules in an air gap for surge protection is identified and discussed.     

40Cr钢渗氮过程中碳原子的迁移

将正火４０Ｃｒ钢样在不同温度下进行不同时间的气体渗氮，对其横断面进行波谱分析，发现渗氮前沿附近自始至终存在着典型的贫碳区，其两侧为富碳区，透射电镜分析结果表明，碳原子的重新分布包括碳化物的回溶、碳的扩散及碳化物长大三个过程。     

铝合金焊缝超声TOFD检测的信号特征

针对厚板铝合金焊接接头的检测，研究了超声衍射时间差法（TOFD）检测时的信号特征及衍射规律，并探讨了最佳检测工艺参数和缺陷测量精度。研究结果表明，缺陷尺寸的测量结果与真实值基本吻合。其研究为实际焊接接头的检测奠定了基础。     

Independently controllable dual‐band microstrip bandpass filter using quadruple‐mode stub‐loaded resonator

In this article, a quadruple‐mode stub‐loaded resonator (QM‐SLR) is introduced and its four modes are excited using a simple approach, which can provide a dual‐band behavior. By changing the length of the loaded stubs, independently tunable transmission characteristics of the proposed quadruple‐mode stub‐loaded resonator were extensively described for filter design. Moreover, microwave varactors were adopted to represent the length variation of the loaded stubs for the dual‐band tunability. The equivalent circuit modeling of the open stub with microwave varactor was given and discussed. Then, adopting the compact quadruple‐mode stub‐loaded resonator with three varactors, an independently controllable dual‐band bandpass filter (BPF) was designed, analyzed, and fabricated. Its separated bandwidths and transmission zeros can be tuned independently by changing the applying voltage of the microwave varactors. A good agreement between simulated and measured results verified the design methodology. The proposed filter possesses compact size, simple structure, and excellent dual‐band performances. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:602–608, 2016.     

后现代主义对招贴艺术的影响与启示

在后现代主义背景影响下,招贴艺术设计蓬勃发展,首先,后现代主义丰富了招贴设计的视觉语言与内涵;其次,后现代主义启示了招贴艺术可以借用任何媒介、任何手法、任何语言来实现设计;最后,后现代主义启示了招贴艺术可以借用任何媒介、任何手法、任何语言来实现设计。     

SHSim:基于OSGI的智能家居的系统测试平台

随着普适计算技术的发展,智能家居逐渐普及。智能家居在实际部署过程中往往需要集成很多不同的设备和应用服务,开展设备间的联调和系统集成测试工作通常比较困难。为了解决这个问题,本文描述了一个基于OSGI框架,适用于智能家居环境使用的系统测试平台SHSim。SHSim基于可配置化的动态机制,可以方便地增加新设备而不需要修改任何代码,实现了透明模拟功能——模拟设备不用修改(或者很少改动)即可迁移到真实设备,大大提高了测试平台的可用性。通过在智能家居项目的实际应用,验证了该系统测试平台可以有效地控制开发流程,减少整个项目测试成本,提高了开发效率。     

独立学院VFP程序设计教学存在的问题及解决方法

根据独立学院的学生特征和VFP课程的教学现状,以提高学生的计算机应用能力为目的,提出摒弃传统教学"重理论,轻实践"的思想,采用案例教学法和任务驱动法,在真实情境中让学生自己动手由浅入深,逐步开发出一个完整的管理信息系统.