十八烷基二甲基氯化铵水溶液动态表面张力及吸附动力学研究

使用最大气泡法测定了十八烷基二甲基氯化铵（C_(18)DAC）水溶液的动态表 面张力,考察了浓度、温度等对其DST的影响,详细表征了DST随时间的变化过程, 计算了动态表面张力的各种参数（n,t_i,t~*,t_m,R_(1/2)）。结合Word- Tordai方程计算了表观扩散系数（D_a）和吸附势垒（E_a）,对其吸附动力学模式 进行了研究,探讨了DST参数的物理意义。结果表明,t~*值越小,吸附势垒E_a越 大,宏观扩散系数D_a越小,表面活性剂分子越不易吸附在溶液表面;C_(18)DAC低 浓度时吸附属于扩散控制模式,高浓度时属于混合控制模式;高浓度时,在吸附初 期（t → 0）为扩散控制模式,吸附后期（t → ∞）为混合控制模式。     

一种基于决策矩阵的DST-AHP多属性决策方法

针对层次分析法决策时存在两两判断、一致性检验次数过多和判断矩阵残缺性等问题,本文提出了一种基于决策矩阵的DST-AHP多属性决策方法。该方法结合决策矩阵的特征值,构建DST-AHP方法层次结构模型和判断矩阵,并根据判断矩阵定义不同属性下各焦元的基本概率分配函数;然后利用Dempster合成法则对基本概率分配函数值进行合成,依据合成后值对方案进行排序。最后对AHP和DST-AHP两种方法进行比较分析,说明该方法的有效性。     

DST与DSmT自适应融合算法

与DST相比，DSmT可以很好的解决证据矛盾时的证据组合问题，但是DSmT计算量过大，且在低冲突情况下融合结果次于DST。文章在DST和DSIllT的基础上提出一种将两种融合方法结合使用的融合算法——DST与DSmT自适应融合算法。以冲突率作为判决依据，在冲突率较低情况下采取DST融合算法．当冲突率高于一定阈值时采用DSmT融合算法，并给出了DST和DSmT之间转化的方法。在进行三维飞机序列图像的目标类型识别中．采用本文提出的自适应算法进行迭代运算，可以快速准确地进行目标识别。     

Generating algorithm for integer DST radixes in video coding

Recently released H.265 is the new generation video coding standard established by ITU and ISO jointly. H.265 is the first to apply discrete sine transform (DST) to transform unit in intra prediction block, with it implemented in an integer transform approach. Given that the integer transform radixes of DST are not unique, it is a key task to seek for them possessing strong de-correlation capability and simple arithmetic calculation as well. This paper presents a generic generating algorithm for integer DST transform radixes through a deep insight into the principle of integer DST transform. Subject to three essential constraints on integer transform matrix, this method establishes a cost function comprising orthogonality metric and accuracy metric with respect to entries of a 4 × 4 matrix, and then seeks transform radixes via a heuristic search strategy. Experimental results show that our method can find out a set of DST radixes after dozens of search steps. The revealed DST radixes not only cover the one used by H.265 but also include a basis superior over H.265’s in terms of orthogonality and precision.     

A DCT/DST-based error propagation-free data hiding algorithm for HEVC intra-coded frames

Currently, two error propagation-free discrete cosine transform (DCT)-based data hiding algorithms, one by Ma et al. and the other by Lin et al., were presented for H.264/AVC intra-coded frames. However, the state-of-the-art video codec, high efficiency video coding (HEVC), adopts both integer DCT and discrete sine transform (DST) such that the previous DCT-based algorithms cannot fully utilize available capacity for data hiding in HEVC. This paper presents the first DCT/DST-based data hiding algorithm for HEVC intra-coded frames where the block DCT and DST coefficient characteristics are investigated to locate the transformed coefficients that can be perturbed without propagating errors to neighboring blocks. Experimental results confirm the merits of the proposed algorithm in providing the intra-frame error propagation-free advantage, the quality improvement for marked images, the compression power inherited from HEVC, and the superiority of embedding capacity for low bitrate coding when compared with the previous two algorithms for H.264/AVC.     

基于条件证据更新方法的短时软/硬情报融合

介绍了软/硬情报融合新方法,分析了证据理论(DST)应用于软/硬情报融合的灵活性。在此基础上,以Fagin-Halpern(FH)DS条件原理为依据,提出了一种面向情报融合中多源证据的条件更新方法,避免了扩展识别框架,并明确了该方法的参数选取标准。另外,基于时间表对融合过程进行短时划分,以提高融合的精确性。通过融合实例对所提方法进行了分析说明。     

费涅尔透镜的焦区场──谱域法与物理光学法的比较

本文分别采用传统的物理光学法（PO）和全被分析的谱域技术（SDT），分析了费涅尔区板（FZP）透镜的焦区场分布。SDT法的计算结果与文献的实验结果一致。通过对PO与SDT两种方法的数值结果比较可知：对单层FZP透镜，PO分析结果的有效性依赖于透镜的焦距与透镜的费涅尔区下限之比，而SDT则具有广泛的适应性。     

虚像相位阵列的研究进展及应用

虚像相位阵列（VIPA）,是一种新型的色散补偿器件,它可以产生大范围的角度色散,并且可以对色散和色散斜率进行同步独立的补偿。其次,它还有一些更吸引人的性能,比如非常小的偏振态依赖性,色度色散的机械可调性和小封装的可行性等,适合于下一代密集波分复用（DWDM）高速光通信系统。详细介绍VIPA的工作原理及其研究进展,同时还介绍了它的一些最新应用和发展动向。     

几种离散正、余弦变换的卷积乘积关系

本文导出第Ⅰ、Ⅱ种奇、偶离散正、余弦变换的变换域乘积与时域卷积的严格关系,从而可用这些正弦族正交变换做数字滤波。     

Supercharacters and the discrete Fourier,cosine, and sine transforms

Using supercharacter theory, we identify the matrices that are diagonalized by the discrete cosine and discrete sine transforms, respectively. Our method affords a combinatorial interpretation for the matrix entries.