分阶段二次变异的多目标混沌差分进化算法

提出一种结合分阶段二次变异和混沌理论的改进差分进化(DE)算法,以解决多目标约束优化问题.其核心思想是,在DE进化前期采用基于非支配解的随机二次变异来提高算法的全局寻优能力,进化后期采用基于非支配解的混沌二次变异来提高DE的局部寻优能力.通过对典型测试问题的仿真实验验证了所提出的算法能在全局搜索性能与局部搜索性能之间维持较好平衡,而且保持了DE算法的简洁性能,其收敛性、分布度和均衡性均优于标准DE.     

基于改进伪中值滤波器的道路图像滤波算法*

针对已有的细胞神经网中值滤波器滤波时,收敛速度慢、稳定性不好以及滤波图像比较模糊的缺点,设计一种差值控制细胞神经网的改进伪中值滤波器。提出了改变取值空间、引入随机扰动、扩大中值滤波窗口尺度和引入Mask掩图的改进方法。实验结果表明：该算法具有去除各种强度脉冲随机噪声能力,又能保护图像细节信息,而且具有良好的实时性。     

Several melanosis-inhibiting formulas to enhance the quality of deepwater pink shrimp (Parapenaeus longirostris)

The aim of this work was to assess the effect of several melanosis-inhibiting formulations on quality of deepwater pink shrimp (Parapenaeus longirostris) during storage. The formulations tested were as follows: one containing 4-hexylresorcinol (0.1%) in combination with organic acids (citric, ascorbic and acetic) and chelating agents (ethylenediaminetetraacetic acid [EDTA] and di-sodium di-hydrogen pyrophosphate [PPi]); a commercial formula based on sulphites (3%), and another formulation containing a mixture of chitosan (0.3%) and commercial sulphites. Non-treated shrimp were used as control. The 4-hexylresorcinol-based formulation was more effective than 3% of commercial sulphite solutions in preventing melanosis. This treatment prolonged the sensory acceptability of shrimp by up to six days in ice storage. During chilled storage, the treatment with the 4-hexylresorcinol-based formula inhibited the growth of microorganisms by 1.5–2 log cycles as compared to commercial sulphites, especially H₂S-producers and pseudomonads. At the end of the experimental period, TVB-N levels were slightly higher in the lot treated with 4-hexylresorcinol (33 mg/100 mg) and reflected greater endogenous enzymatic activity, since the counts of the spoiler microorganisms remained around log 5 cfu/g or even lower. In general, the incorporation of chitosan to sulphites did not improve or produce a marked effect on shrimps during storage. During the sensory analysis, the panellists rated all the lots very similar, although the 4-hexylresorcinol formulation was the only one with a neutral odour at the end of the period. The 4-hexylresorcinol-based formulation induced yellow-green colorations to some extent in the cephalothorax, possibly due to the effect of organic acids and chelants, while the rest of the lots presented greyish/blackish colorations. Therefore, the formulation based on 4-hexylresorcinol may safely substitute traditional sulphites to improve the quality of fresh shrimp and prolong their shelf life during storage.     

低碳低合金及含铜海洋工程用钢的研究及其发展

随着海洋资源的不断开采和利用,对深海及极地用海洋工程关键部位用钢强韧性等综合性能提出了更高的要求;开发具有更高强塑性,低屈强比,良好的低温韧性、焊接性以及耐腐蚀性等综合性能优良的钢材是海洋工程用钢的发展方向。介绍了国内外低碳低合金海洋工程用钢的研究和发展概况,分析了该类钢种制造过程中面临的问题,对铜在低碳高强钢中的作用以及含铜海洋工程用钢的研发情况进行了综述。     

案例推理在果树病虫害诊断与防治专家系统的研究

根据果树病虫害诊断与防治的特点和要求，将案例推理技术引入到果树病虫害诊断与防治专家系统设计中。阐述了案例推理概念和工作过程，在具体应用中提出了案例知识表示、两层的案例库组织结构和检索推理机制，得出基于案例推理果树病虫害诊断与防治专家系统实现算法流程。该系统在实际应用中获得了较好的效果。     

一种三维传感执行网络节点位置感知算法

传感执行网络是由一组通过有线或无线通信方式连接起来的,并完成感知与执行功能的传感器与执行器节点组成的面向应用的分布式网络。位置感知是指确定节点在网络中的坐标值。已提出的算法中大部分是针对二维布置网络,提出了一种基于循环组合四边测量法的用于三维传感执行网络的节点位置感知算法,这种算法依据信标节点相对于未知节点的几何位置并利用权重多面体和权重重心法估算未知节点的几何位置。它的主要特点是:可明显提高感知精度,且对测距误差具有很好的鲁棒性。     

一种基于图像内容的数字水印算法

有望解决数字媒体版权纠纷的数字水印技术须满足3个相互冲突的基本要求:不可见性、健壮性和嵌入容量。应用信息论中多维无记忆加性高斯信道容量公式,提出一种基于图像内容的高容量算法。算法在保证水印不可见性的前提下,尽可能多地嵌入强度大的水印信息。水印的检测不需要原始图像,属于盲水印算法。仿真结果表明,运用该算法在图像中能嵌入较多的水印信息,同时具有很好的健壮性。     

基于社会-技术理论的工作单元评价模型

针对现有的对工作单元评价的文献侧重于从技术性角度进行评判的问题,综合考虑单元组织具有的社会和技术特性,从降低成本、改进质量、增强灵活性、压缩时间等4个方面构建了单元组织的社会-技术性(STS)评价指标体系,并运用层次分析法构造了评价模型.