Error Concealment Based on Semantic Prioritization with Hardware‐Based Face Tracking

With video compression standards such as MPEG‐4, a transmission error happens in a video‐packet basis, rather than in a macroblock basis. In this context, we propose a semantic error prioritization method that determines the size of a video packet based on the importance of its contents. A video packet length is made to be short for an important area such as a facial area in order to reduce the possibility of error accumulation. To facilitate the semantic error prioritization, an efficient hardware algorithm for face tracking is proposed. The increase of hardware complexity is minimal because a motion estimation engine is efficiently re‐used for face tracking. Experimental results demonstrate that the facial area is well protected with the proposed scheme.     

光纤Bragg光栅监测钢筋混凝土结构应变的实验研究

研究了光纤Bragg光栅在钢筋混凝土结构应变监测中的应用。对其应变、温度灵敏系数进行标定,将其埋设在钢筋混凝土梁内,实现对结构内部应变的监测,并对其工作状态做出评价。实验结果与理论值、传统监测手段监测结果一致。研制出一种钢管封装Bragg光栅温度传感器监测温度,对光纤Bragg光栅的应变与温度的同时测量进行了研究。     

钢筋混凝土框架梁截面的优化确定

以梁的配筋和截面有效高度为优化设计变量 ,导出了 RC框架梁的优化配筋率和优化设计高度 ,并给出了各种荷载作用下 ,不同设防烈度和场地类别条件下的截面优化设计高度表达式 ,为设计人员提供了方便 .     

C60高性能预拌混凝土的生产及应用

介绍了C60高性能预拌混凝土的研制及生产应用的过程与方法 ,对材料的性能、搅拌工艺进行了深入分析 ,为生产高强高性能混凝土提供了详细的思路     

Empirical modelling of shear strength of RC deep beams by genetic programming

This paper investigates the feasibility of using genetic programming (GP) to create an empirical model for the complicated non-linear relationship between various input parameters associated with reinforced concrete (RC) deep beams and their ultimate shear strength. GP is a relatively new form of artificial intelligence, and is based on the ideas of Darwinian theory of evolution and genetics. The size and structural complexity of the empirical model are not specified in advance, but these characteristics evolve as part of the prediction. The engineering knowledge on RC deep beams is also included in the search process through the use of appropriate mathematical functions.The model produced by GP is constructed directly from a set of experimental results available in the literature. The validity of the obtained model is examined by comparing its response with the shear strength of the training and other additional datasets. The developed model is then used to study the relationships between the shear strength and different influencing parameters. The predictions obtained from GP agree well with experimental observations.     

浅谈现浇框架柱施工中部分质量问题的防治措施

通过对现浇框架施工中柱位移错台、柱子主筋偏移、楼板超厚及保护层不足等质量问题进行综合分析，阐述了此问题出现的根本原因，并提出了防范措施。     

城市污水处理系统中砼耐久性的试验研究

本文系统阐述污水环境下砼腐蚀及耐久性问题,分析了引起砼破坏和腐蚀的各种因素,提出采用高性能砼改善污水环境下砼的耐久性。     

泵送C60自密实混凝土在工程中的应用

通过使用聚羧酸盐外加剂、控制粗骨料粒径不超过20mm和使用粉煤灰＋矿渣双掺30%的途径配制出了满足工程需要的泵送C60自密实混凝土;经过制定正确的浇筑方案和对混凝土生产、运输、浇筑与养护等关键环节的控制,拆模后的混凝土结构内部均匀密实,外观质量良好,很好地解决了配筋密集结构的混凝土施工难题.     

模袋混凝土在清安河整治工程中的应用

结合淮安市清安河整治工程概况,对护坡工程方案进行了技术经济比较,经综合比较,选定采用模袋混凝土护坡方案,并详细阐述了模袋混凝土的施工工艺,以推广模袋混凝土技术的广泛运用。     

钢纤维聚合物混凝土抗压本构关系

钢纤维聚合物混凝土是由聚合物混凝土基体和钢纤维共同组成的纤维增强复合材料，它的力学行为不仅依赖于聚合物混凝土基体的行为，而且与钢纤维的掺量、分散特征以及钢纤维的几何尺寸有关，本文将基于损伤力学原理研究在不同纤维掺量下的钢纤维聚合物混凝土的全程压力-应变曲线及其本构模型。