面向虚拟试验的可视化应用生成工具研究与实现

虚拟试验能够很好地辅助实物试验,缩短型号研制周期,降低研制费用;虚拟试验应用工程是开展虚拟试验的基础,基于GEF图形编辑器,研究并实现了一种面向虚拟试验可视化应用生成工具,具有可视化应用工程编辑、应用工程框架代码生成等功能;支持在可视化界面中定义VOM图元和APP图元之间的发布、订阅关系,最终生成应用工程框架,并通过应用实例验证了该可视化应用生成工具的实用性,较好地提高了虚拟试验应用工程的开发效率.     

A study of optimal viewing distance in a parallax barrier 3D display

The optimal viewing distance was proposed as a parameter for designing a parallax barrier 3D display. It can be designed based on simple geometric method and by considering the pitches of image display pixels and parallax barrier, or even including the aperture ratios of the image display pixels and parallax barrier. It can be analyzed by using ray tracing method. By considering the optical refraction index of the cover glass, the angular behavior of the system becomes more realistic; however, the geometric method is difficult to be used. We propose a revised method for estimating the view distance and angular behavior. In this paper, we have demonstrated a designated eye position (DEP) for each view and shown that multiple DEPs make a circular curve around the center of the display. We prove the new concept by comparing the optical ray tracing calculations and optical measurement.     

CAST工艺设计计算方法探讨

分析了目前国内CAST工艺采用的几种设计计算方法的共同之处、各自特点及存在的问题。在此基础上,结合多年实际设计运行经验,提出并推荐一种新的设计计算方法。该推荐方法以满足生物反应需要作为制约因素进行设计和计算,并根据生物处理目标所确定的泥龄和生产实际运行所能达到的混合液污泥浓度来推算污泥总量、反应池有效容积及其他设计数据,排除了凭经验设计计算的任意性。最后介绍了推荐方法在实际工程中的应用情况。     

Development of a nanofluidic preconcentrator with precise sample positioning and multi-channel preconcentration

A nanofluidic preconcentrator with the capability of rapidly preconcentrating and precisely positioning protein bands in multiple microchannels has been developed for highly sensitive detection of biomolecules. A novel electrical resistive network model is developed to guide the design of the nanofluidic preconcentrator which consists of a PDMS slab bonded with a glass slide. In the prototype design, two microchannels (23 mm long, 25–50 μm wide, and 5–15 μm deep), one preconcentration microchannel and one ground microchannel are connected in the middle via 16 nanochannels (25–50 μm long, 25 μm wide, and 50–80 nm deep). With two sets of optimal voltage settings applied on the opposite ends of the nanofluidic chip, the ion depletion region and electrokinetic trapping were generated to carry out the preconcentration. With the optimal voltage settings (30–30 V) predicted by the model, the ionic current of the nanochannel in our optimized preconcentrator was adjusted to be greater than the threshold value (3.9 nA) needed for the occurrence of the preconcentration, and a preconcentration factor >10⁵ was achieved in 5 min. The sample positioning capability of the preconcentrator was demonstrated by adjusting the applied voltages and moving the preconcentrated protein bands to multiple sites by a distance from several micrometers to several millimeters in the preconcentration channel. The multi-channel preconcentration capability was also demonstrated by preconcentrating two protein bands in two separate microchannels. In this work, the resistive network model was developed and validated to optimize nanofluidic preconcentrators for rapid, high throughput and highly sensitive sensing of low abundance analytes.     

探析办公自动化的网络安全

随着社会科学以及社会经济的高速发展,计算机已经普及到了日常的工作、生活,而利用计算机的办公自动化,更是办公的阶段性提高.但是,办公的自动化也伴随着一些网络的安全问题,而提高网络的安全监管,防止信息的失真、修改、盗取,就显得非常重要了.本文就这个问题进行简单的探讨.     

CFB-FGD半干法烟气脱硫网络控制系统的设计与实现

循环流化床半干法烟气脱硫（CFB-FGD）技术是目前烟气脱硫综合效益最优越的一种半干法烟气脱硫技术。文章主要设计并实现了CFB-FGD半干法烟气脱硫网络控制系统。该系统结合了快速以太网、工业以太网以及现场总线,构成三层控制网络;采用了合理的冗余结构,提高了系统的可靠性。实际的运行表明,该系统实现设计合理稳定,实现了半干法烟气脱硫的自动化控制,提高了脱硫效率。     

关于无线传感器网络MAC层协议的研究

当前,无线传感器网络(WSN)是国内外备受关注的一个新兴前沿热点领域,已经吸引了许多研究者和机构的广泛关注.本文简单介绍了无线传感器网络以及MAC协议,对MAC协议进行了分类、分析,比较和总结了这些协议的核心机制、性能和特点,最后得出结论,展望了今后无线传感器网络MAC协议的研究重点及策略.     

CAD/CAE公共服务平台中资源共享智能型系统研究

在产业技术公共服务平台的影响和带动下,随着其用户规模不断扩大和信息技术的发展,越来越要求平台服务向智能化发展,有必要对其中之一的资源共享智能型系统建设进行探讨。     

Enhancing the accuracy of WLAN-based location determination systems using predicted orientation information

Indoor location determination has emerged as a significant research topic due to the wide-spread deployment of wireless local area networks (WLANs) and the demand for context-aware services inside buildings. However, prediction accuracy remains a primary issue surrounding the practicality of WLAN-based location determination systems. This study proposes a novel scheme that utilizes mobile user orientation information to improve prediction accuracy. Theoretically, if the precise orientation of a user can be identified, then the location determination system can predict that user’s location with a high degree of accuracy by using the training data of this specific-orientation. In reality, a mobile user’s orientation can be estimated only by comparing variations in received signal strength; and nevertheless the predicted orientation may be incorrect. Incorrect orientation information causes the accuracy of the entire system to decrease. Therefore, this study presents an accumulated orientation strength algorithm which can utilize uncertain estimated orientation information to improve prediction accuracy. Implementation of this system is based on the Bayesian model, and the experimental results indeed show the effectiveness of our proposed approach.