利用流形技术的遥感高光谱图像边缘检测

对于遥感高光谱影像,"光谱边界"还未被明确的定义,这是因为谱空间中存在多维的复杂性.一个新的光学边界定义的提出要基于流形学习的数学趋近方法.要考虑谱空间中的光谱特性以及像空间的像函数不连续性.使用EO-1高光谱图像试验分析表明基于光谱边界的方法拥有描述高光谱影像边界轮廓的令人期待的表现.     

光的运用——建筑空间灵魂的塑造

光线是揭示生活的因素之一,光线又是推动生命活动的一种力量.把光线视为独立的视觉现象来对待,利用光线形成视错觉,则会创造出特殊的环境艺术效果.论述了如何利用影子、光斑、高光及泛光照明塑造建筑空间环境.     

考虑新能源并网影响的零序过电压解列策略

目前新能源并网故障零序过压解列判据按躲过中性点直接接地系统正常运行时的不平衡电压整定,解列时间与新能源场站的变压器间隙零序过压保护配合。然而当线路发生高阻接地短路或者线路的保护Ⅱ段范围内发生故障时,该策略存在新能源大面积误解列问题。为此文章提出一种可靠防止新能源大面积误解列的零序过压解列策略的改进方法,并设计了解列判据,最后通过仿真以及实际故障验证了策略的有效性。结果表明,该解列策略具有高可靠性和实用性。     

Regularized multiple criteria linear programs for classification

Although multiple criteria mathematical program (MCMP), as an alternative method of classification, has been used in various real-life data mining problems, its mathematical structure of solvability is still challengeable. This paper proposes a regularized multiple criteria linear program (RMCLP) for two classes of classification problems. It first adds some regularization terms in the objective function of the known multiple criteria linear program (MCLP) model for possible existence of solution. Then the ...     

为减轻红石岩堰塞湖防洪压力的德泽水库防洪调度研究

鲁甸“2014.8.3”地震牛栏江红石岩堰塞湖永久整治期间,牛栏江流域防洪压力增大。为有效减轻红石岩堰塞湖防洪压力,对德泽水库防洪调度方案进行研究。分析了德泽水库、红石岩堰塞湖及区间设计洪水峰量,以及有、无水库调节对堰塞湖的影响差异,确定了德泽水库4种泄洪方案相应的堰塞湖最大洪峰流量、水位变幅等,认为德泽水库错峰调度对于减轻红石岩堰塞湖永久整治期间的防洪压力和促进安全生产有着重要意义,提出了确保施工安全的措施建议。     

Human stochastic closed-loop behavior for master-slave teleoperation using multi-leap-motion sensor

Teleoperation has a wide range of applications that have been under development over the past two decades. Previous researches have focused on the control design of teleoperation machine systems to deal with obstacles such as time-delayed stability and transparency. Recent researches have shown that the inclusion of human closed-loop dynamics in control design can improve the performance of robot telemanipulation. The complexity of human behavior arises from the uncertainty of both human physiology and psychology; hence, the investigation can benefit from empirical studies. This study develops a type of statistical learning method to model and evaluate human stochastic closed-loop behavior, which is considered as a hand motion during the direct incremental control process of master-slave teleoperation. The hand trajectory is empirically considered as having a binary linear regression relationship with the error and error rate between the demanded and simulated teleoperator trajectories, while random movements with zero error and error rate are discovered. Hand movement tracking is achieved using a multi-leap-motion sensor (MLM), which is a markerless and natural infrared vision-based manner for motion capture. The established behavior model and statistical learning results reveal certain human properties of operational activities including visual perception, decision making, and robot telemanipulation. The properties indicate some probable system enhancements for future work.     

Characterization of （Y, Gd） BxV1-xO4-x ： EU Phosphor Prepared by Coprecipitation Reaction

White body-color （Y, Gd）BxV1-xO4-x ：Eu^3＋ phosphors were prepared by coprecipitation reaction. Under VUV excitation at 147 nm, the red emission colorimetric purity of （Y, Gd） BxV1-xO4-x： Eu^3＋ phosphor is much better than that of commercial PDP （plasma display panels） phosphor （Y, Gd）BO3：Eu^3＋ . But its relative emission intensity is only about 90% of the commercial phosphor.     

用SPI器件扩展神经元芯片的I/O端口

本文描述了一种用SPI接口的多路复用器MAX349扩展LonWorks神经元芯片端口的方法,包括连接多个MAX349时的硬件连接方式及软件实现过程.文中提出的方法的特点在于,利用神经元芯片的Neuronwire接口还可以连接具有其它功能的SPI器件,构成具体的应用系统,充分利用神经元芯片的I/O,对于开关量较多的检测或控制系统具有很强的实用性.这种方法已经被用于基于LonWorks的地温中央空调控制器中,并取得了良好的效果.     

含多个穿透裂纹的多孔紧固件传载结构裂尖应力强度因子研究

多孔多裂纹紧固件传载结构的安全问题是当今航空界中广泛关注的问题之一.文中通过采用销钉和平板间接触的有限元方法,建立含单裂纹单孔、含单裂纹的串联双孔、含双裂纹的串联双孔、含四裂纹的串联双孔、含双裂纹的并联双孔和含四裂纹的并联双孔紧固件传载结构等六种计算模型,对计算模型的裂纹尖端应力强度因子进行计算.通过大量计算,给出典型的串联多孔多裂纹连接结构和并联多孔多裂纹连接结构应力强度因子计算结果曲线,分析其相互影响规律和原因,计算结果和结论可以作为该类结构损伤容限设计的参考依据.     

高增益低噪声心电放大器的设计与分析

从体表获得的心电信号经导联输入后，由模拟多路开关进行切换，经前置放大器放大及滤波器滤除高频干扰后，再经一个50Hz陷波器进一步抑制电源干扰，然后通过电平位移进入A／D转换得到数字化的心电信号。以BiFET LF411型运放构成的前置放大器和以有源高通-低通滤波器为主要部件的高性能心电放大器可实现输出电压高增益、低噪声、高灵敏度，保证心电信号清晰稳定，满足临床监护以及病理分析的要求。