Eye and Iris Detection Using Projection and Radial Symmetry Transform

This paper presents an eye and iris detection algorithm for human facial images. The authors combine three features of the eye to develop the algorithm: 1) the pixels surrounding the eyes are more variable than other parts of the face; 2) eye pixels are darker than their neighbors; 3) eyes often exhibit radial symmetric properties. Through the first feature, two rough regions of both eyes are detected on the face. Eye masks are then formed based on the second feature, and a fast radial symmetry transform is applied to the two rough regions of both eyes. Finally, accurate iris centers are located by searching the maximum value of the radial symmetry transform results. Using 450 human facial images from the Caltech face database, experiments show that the success rate of the proposed method is 91.7%. The effectiveness of the method was also verified through detection of video frames.     

Novel Control Method for Dynamic Voltage Regulator

Control strategy affects directly the working performances of dynamic voltage regulator (DVR). One-cycle control is an effective nonlinear signal modulation control method. In this paper, a new one-cycle control scheme for DVR was proposed in single phase supply system. On the basis of principle analysis, the corresponding one-cycle control model for DVR was built up, which is characterized by simple control circuits, good control performance, and high control precision. As an example, a control model for s...     

交通宁静化在中新天津生态城的尝试

交通宁静化是机动车减速技术的总称,是绿色交通构建的一个重要方面。该文阐述了交通宁静化的基本理论、理念和主要实践措施,并充分结合生态城交通发展趋势,提出生态城交通宁静化的规划和实施要点,为区域绿色交通的实现提供保证。     

高应力下砂与混凝土界面单剪试验研究

通过对高应力下饱和砂土同混凝土界面一系列单剪试验数据的分析得到：高应力下砂土同混凝土界面剪应力-剪切位移关系,可用一条曲线和一条平直线表示;高应力下界面的强度准则可用无粘聚力的莫尔-库仑公式表示。     

燕山水库溢洪道黄土击实效应研究

针对燕山水库溢洪道黄土．采用室内改变黄土含水率击实试验和对击实样进行剪切试验发现,含水率对击实黄土具有特殊的灵敏性。击实样含水率在14％～17％时,黄土粘聚力急剧下降,而摩擦角随含水率的增加呈现先增大后降低趋势。击实饱和样与击实非饱和样压缩性存在较大差异,表现在压应力为300kPa时压缩性得到明显改变,前者压缩性接近是后者的4倍。在工程实际中,当对溢洪道进行击实加密时,要对浸水地基和不浸水地基区分对待。     

成都地铁2号线对地下水的影响评价

以即将动工的成都地铁2号线一期工程为例,初步探讨成都地铁工程对地下水的潜在影响。采用三维地下水流动数值模拟方法,模拟地下水位壅高的情况。通过计算地下车站的降水影响范围,提出为防止河流倒灌,施工时需添加注水井的保护措施。     

高填路堤沉降有限元解法

通过用有限单元法对一高填路堤典型断面的计算,并将所得沉降值与实测数据进行对比分析,得出：用D—P模型结合有限元分析软件计算地基沉降是可行的。     

汽车动力转向系统匹配性能分析

分析了汽车动力转向系统主要部件匹配试验与台架试验相互间的关系和差异,揭示了产生这些差异的原因,为动力转向系统的匹配试验研究和匹配评价提供了依据.     

动力减振器在某车型降噪中的应用

NVH不仅是影响车辆舒适性的重要因素,而且也是评价其品质的重要指标之一.在对某微型车NVH性能研究的基础上,通过试验发现该车低速轰鸣声(Booming)是由后桥Z向2阶振动引起的.为此,开发了一套动力减振器,应用于该车使得后桥Z向2阶振动降低了10dB,相应的驾驶员右耳的阶次噪声降低了5 dB,有效解决了该系列车型存在的低速轰鸣声问题.