多媒体“金属切削刀具”CAI课件的开发实践

本文通过多媒体“金属切削刀具”ＣＡＩ课件的开发实践，论述了ＣＡＩ课件在教学中的重要作用，阐述了ＣＡＩ课件的制作方法和具体实践过程。     

CAD技术及其在卫星工程中的应用

CAD 技术作为一种高效率、高质量、高精度的设计技术,正在包括航天技术在内的多个领域中广泛应用,发挥其效益。尤其是在机械(MCAD)与电子(ECAD)两方面的应用,更是令人瞩目。本文就CAD 技术的范畸、功能、组成、主要技术等并结合卫星研制的具体应用前景,作一介绍,目的在于推动CAD技术的开展,并为CAD/CAM 一体化做好思想准备。     

Risk-taking during wayfinding is modulated by external stressors and personality traits

ABSTRACT

Two experiments examined cue reliance and risk-taking during desktop virtual wayfinding, and how they might be modulated by personality traits and external stressors. Participants navigated a series of virtual buildings and we manipulated the strength of probabilistic cues available to guide turn decisions. Navigators frequently discounted probabilistic cues and instead took risks, particularly when costs were low and potential benefits were high. Risk-taking was predicted by higher sense of direction and lower need for structure. Introducing a time stressor lowered risk-taking, with a higher relative reliance on probability-based information. This was most pronounced in females and those with a high need for structure. Results provide novel evidence that spatial cue reliance is modulated by individual differences and contextual constraints.     

计算机情报检索技术浅谈

文章对计算机情报检索技术中的方法及应用作了叙述。指出了文献检索中将会遇到的问题及解决的办法。给出了检索实例和结论。     

Optimal network topology of relative navigation and communication for navigation sharing in fractionated spacecraft cluster

Navigation sharing as a key technology provides orbit and attitude information broadcasting for the whole fractionated spacecraft cluster (FSC). The navigation sharing concept has already been proposed for some years. However, the problem of achieving the optimal navigation sharing by designing the proper network topology is still unsolved, especially in the case that some members of the cluster have absolute navigation devices, some just have relative navigation devices and some only have communication devices. In this paper, a comprehensive model of describing the navigation sharing problem in FSC is proposed. The model of network topology constructing by relative navigation links and communication links is established. By using the graph theory and genetic algorithm as the tool, the conditions for navigation sharing in FSC with different sharing degrees are obtained. Finally, some examples are presented to test the methods, and it has been found that, the absolute positions and attitudes of all the members can still be determined even some members in FSC have no absolute navigation devices.     

二维计算机图象检测系统

目前,利用机器视觉系统监测生产过程和进行质量控制是一个非常活跃的研究领域。当把视觉系统用于几何量测量时,必须解决其硬件的分辨力极限所带来的问题:测量精度高意味着测量范围小,或者,测量范围大意味着测量精度低。提出了解决上述问题的方法:一个由步进电机驱动的XY工作台与图象处理系统相结合。产生出一个多坐标系统结构。测量参数在两个坐标系之间传送,并在100mm×100mm范围内,在X和Y两个方向,达到的测量精度为0.02mm。     

一种基于视觉的微型飞行器姿态检测算法

探讨了基于视觉的微型飞行器的飞行状态检测方法，利用机载摄像头获得图像。根据某种准则识别出地平线，进而变换得到飞机的姿态角。文中给出了地平线判别准则及相应的算法和姿态角变换公式。最后，给出了一个实际算例及处理结果。     

信息时代的飞行力学

基于现代信息技术，扼要论述了作为信息时代的飞行力学－－计算飞行力学的产生背景、问题表述、理论框架和计算系统，以及计算飞行力学在未来飞行器发展和运用研究中的作用。     

CamShift在加油锥套识别跟踪中的应用

针对插头锥套式自主空中加油过程中加油锥套的识别跟踪问题,提出了一种基于Cam Shift的视觉识别跟踪算法。选取加油锥套跟踪视觉特征,将RGB空间图像转换到HSV色彩空间,并采用自适应阈值算法分割图像。运用最小二乘椭圆拟合算法解算锥套在图像中的中心点坐标;根据目标像素位置变换速度,对Mean Shift算法的目标搜索窗宽进行自适应修正;定义基于巴氏系数的阈值函数,处理锥套被遮挡的情况;将VC与Open CV相结合,设计了加油锥套视觉跟踪软件,对锥套位置进行实时解算和显示。试验结果表明,该算法可达到毫米级精度,满足自主空中加油视觉导航的技术要求。     

轮廓仪的多参数微机测量系统

介绍了“轮廓仪的多参数微机测量系统”的构成和技术指标，阐述了设计硬件电路和编制数据处理软件的方法，最后对系统的测量精度进行了测试与比对。