运用中医四诊法对电脑故障进行检测

随着电脑科技的不断发展,电脑已经在各行各业中被普遍应用,在提升工作效率方面起到良好的推动作用。同时。电脑故障也给使用者带来一定的麻烦,利用有效的方法对电脑故障进行基本的检测,是现代电脑使用者必须具备的技能。将中医的“望”、“闻”、“问”、“切”四诊法加以转换后对电脑故障进行检测,是检测电脑故障行之有效的方法。     

构建项目课程模式下的新教学评价体系

评价体系的改革是项目课程体系改革的重要一环,在给出传统教学评价体系基础上,构建新教学评价体系,并以具体的工作任务为例说明新教学评价的实施,实践证明,新教学评价体系能激发学生学习的积极性,主动性,有利于培养学生的综合职业能力,缩短学校与社会接轨的时间。     

压差矢量水听器阵波束形成的优化

以各向同性噪声作为背景噪声场,对矢量水听器阵波束形成的优化方法进行了系统的研究.在分析各向同性噪声场中声压、振速相关性的基础上,利用最大信噪比准则推导了基阵的最佳增益与噪声场特性和阵列流形之间的关系,提出利用最佳增益权对阵列接收信号进行波束形成处理.通过对矢量水听器阵进行分解,将最佳增益波束形成引入矢量阵信号处理中.以二维压差矢量水听器阵作为接收基阵进行了仿真计算和湖上试验,结果表明,矢量阵的最佳增益波束形成可以获得性能更优的波束和更大的空间处理增益.     

基于DWILS的无人机着陆导引与控制仿真

导引和控制技术是大型无人机实现自动着陆的两项关键技术。针对分米波仪表着陆系统（DWILS）的无人机着陆导引与控制技术的仿真验证,为了提高导引的可靠性,给出了基于DWILS的无人机着陆地面仿真系统的结构,着陆导引仿真设备,根据DWILS的工作原理给出了导引信号的计算公式,同时设计了着陆控制器。根据导引设备的原理建立了基于DWILS的无人机着陆导引与控制仿真系统模型,并进行仿真验证。仿真结果表明,基于DWILS的导引方式满足无人机着陆导引的需要,设计的着陆控制器具有较好的控制效果。     

红外制导导弹最优导引律工程实现方法研究

为了研究提高导引精度,用最优控制理论推导出的最优比例导引律,给出了一种只需目标视线角速率信息的最优比例导引律工程实现方法,方法不需要最优比例导引律中的相对速度、目标加速度和剩余时间等信息,与基于小离轴角的假设推导得出的经典的比例导引律相比,可满足近距格斗导弹大离轴发射和攻击高机动目标的要求。经仿真结果证明,最优比例导引律的工程实现方法尤其适合不带测距功能的红外制导导弹,与需要剩余时间估计算法的方法相比具有更强的工程可实现性。     

基于模式搜索的连续函数寻优

模式搜索方法是求解最优化问题的一种直接搜索方法,它只根据函数值信息来进行求优。但模式搜索对起始点非常敏感,对好的起始点,模式搜索可以搜索到全局最优点,但对某些起始点,模式搜索只能搜索到局部极值点。本文提出基于模式搜索的一个新方法,实验证明,它能搜索到全局最优。     

Interference Shaders of Thin Films

This paper presents a systematic study of light interferences at single thin films. Based on Fresnel's law, we have derived generic expressions of reflectance and transmittance for film interference, as well as specific expressions for free thin films and films coated on transparent or opaque objects. By combining film interference and volume absorption, we have obtained the reflectances and transmittances of film‐coated thin objects such as ribbons. Illumination models for all interference cases of single thin films are presented, and they have been implemented and tested for various structures and materials.     

VICUR: A human-vision-based algorithm for curve reconstruction

In this paper, a new algorithm, named VICUR, is presented for curve reconstruction problem. From a set of unorganized points, the proposed algorithm can construct curves that look natural to human vision. The VICUR algorithm is based on two connectivity criteria: proximity and good continuation from the prominent Gestalt principles of perception. Experimental results are presented to show the effectiveness of VICUR.     

Motion Planning for Haptic Guidance

Haptic devices allow a user to feel either reaction forces from virtual interactions or reaction forces reflected from a remote site during a bilateral teleoperation task. Also, guiding forces can be exerted to train the user in the performance of a virtual task or to assist him/her to safely teleoperate a robot. The generation of guiding forces relies on the existence of a motion plan that provides the direction to be followed to reach the goal from any free configuration of the configuration space (-space). This paper proposes a method to obtain such a plan that interleaves a sampling-based exploration of -space with an efficient computation of harmonic functions. A deterministic sampling sequence (with a bias based on harmonic function values) is used to obtain a hierarchical cell decomposition model of -space. A harmonic function is iteratively computed over the partially known model using a novel approach. The harmonic function is the navigation function used as motion plan. The approach has been implemented in a planner (called the Kautham planner) that, given an initial and a goal configuration, provides: (a) a channel of cells connecting the cell that contains the initial configuration with the cell that contains the goal configuration; (b) two harmonic functions over the whole -space, one that guides motions towards the channel and another that guides motions within the channel towards the goal; and (c) a path computed over a roadmap built with the free samples of the channel. The harmonic functions and the solution path are then used to generate the guiding forces for the haptic device. The planning approach is illustrated with examples on 2D and 3D workspaces. This work was partially supported by the CICYT projects DPI2005-00112 and DPI2007-63665.     

Optimization of clamped circular piezoelectric composite actuators

This paper addresses the design of clamped circular piezoceramic composite unimorph and bimorph configurations, specifically the conflicting requirements of maximum volume displacement for a prescribed bandwidth. An optimization problem is formulated that implements analytical solutions for unimorph and bimorph configurations using laminated plate theory, including the use of oppositely polarized piezoceramic patches. A range of actuator geometric parameters are studied, and bounds for volume displacement and natural frequency of optimal designs are determined and presented via design curves. In the selected design space, Pareto optimization results for unimorph and bimorph configurations show that optimal volume displacement is related to the bandwidth by a universal power law such that the product of the square of the natural frequency and the displaced volume, a “gain-bandwidth” product, is a constant. Characteristic trends are also described that are independent of the actuator radius for the Pareto optimal piezoceramic patch thickness and radius versus normalized bandwidth. The results are relevant, for example, in the design of zero-net mass-flux or synthetic jet actuators used in flow control applications.