New Architectural Horizons

In recent years, the over-intellectualisation of architecture has detached it ‘from its experiential, embodied and emotive ground’. Juhani Pallasmaa provides a template for architecture and landscape design that enables a stronger continuum between our outer and inner landscapes, drawing on historic and modern artistic inspirations alike. Copyright © 2007 John Wiley & Sons, Ltd.     

量子代数su_q(2)q相干态的耦合q积分核(英文)

当量子代数suq(2 )的两个不可约表示作余积时 ,引入耦合 q积分核将suq(2 )的耦合 q相干态与未耦合 q相干态联系起来 ,讨论了这种积分核与量子CG系数的关系和它的正交归一性 .     

基于Abdou算子的空间自适应图像去模糊算法

在数字图像去模糊的正则化求解过程中,为了更好地保持图像的边缘和纹理,抑制振铃效应,需要结合图像不同空间位置的信息,自适应地调节正则化参数。通过引入Abdou算子计算图像中每个像素的梯度幅值,并考虑人类的视觉系统特性,构造出空间域上的加权矩阵s,从而对正则化参数自适应加权,并采用共轭梯度法进行去模糊求解。与Lagendijk提出的基于局部方差构造加权矩阵的复杂计算不同,基于Abdou算子求解的方法简单可行,去模糊效果良好。     

图像处理中几种数学方法的探讨

研究了奇异值分解在图像压缩中的应用,把共轭梯度法和截断奇异值分解的正则化方法应用于图像恢复中,实验结果表明,这几种数学方法对图像压缩和恢复效果显著。     

Lipid Dynamics in Diisobutylene-Maleic Acid (DIBMA) Lipid Particles in Presence of Sensory Rhodopsin II

Amphiphilic diisobutylene/maleic acid (DIBMA) copolymers extract lipid-encased membrane proteins from lipid bilayers in a detergent-free manner, yielding nanosized, discoidal DIBMA lipid particles (DIBMALPs). Depending on the DIBMA/lipid ratio, the size of DIBMALPs can be broadly varied which makes them suitable for the incorporation of proteins of different sizes. Here, we examine the influence of the DIBMALP sizes and the presence of protein on the dynamics of encased lipids. As shown by a set of biophysical methods, the stability of DIBMALPs remains unaffected at different DIBMA/lipid ratios. Coarse-grained molecular dynamics simulations confirm the formation of viable DIBMALPs with an overall size of up to 35 nm. Electron paramagnetic resonance spectroscopy of nitroxides located at the 5th, 12th or 16th carbon atom positions in phosphatidylcholine-based spin labels reveals that the dynamics of enclosed lipids are not altered by the DIBMALP size. The presence of the membrane protein sensory rhodopsin II from Natronomonas pharaonis (NpSRII) results in a slight increase in the lipid dynamics compared to empty DIBMALPs. The light-induced photocycle shows full functionality of DIBMALPs-embedded NpSRII and a significant effect of the protein-to-lipid ratio during preparation on the NpSRII dynamics. This study indicates a possible expansion of the applicability of the DIBMALP technology on studies of membrane protein–protein interaction and oligomerization in a constraining environment.     

Accurate optimization algorithm for the antenna phase center

The antenna phase center (APC) is very important for the positioning of the antenna and the accuracy of the measurement. This paper presents an optimization method to calculate the phase center accurately. Suppose the phase center is at some known point, a so-called projection sphere can be drawn with this point as the center, and all the measured points can be projected onto this sphere. Then the phases of the projected points are obtained by those of the former, and an objective function is defined by the sum of squares of the differences between these phases and their average value. Finally, the conjugate gradient method (CG) or the genetic Algorithm (GA) can be used to find out the coordinate of the phase center. Instead of measuring the antenna phase repeatedly, this new method can determine the coordinates of the phase center accurately in one single operation. Its accuracy is validated by the numerical results of a dipole and a horn antenna.     

LTE移动互联网流量计费准确性测试初探

根据广东电信4G LTE移动互联网流量计费的现状以及组网架构,利用现网搭建移动互联网流量计费测试环境,通过多种场景下的测试、对比以及数据分析,对4G的流量计费原理及准确性等进行初步论证和阐述。     

基于自适应模拟退火算法的薄膜特性参数计算方法研究

提出了根据测量得到的待测薄膜的透射率数据,采用全局优化算法—自适应模拟退火算法结合共轭梯度算法求解薄膜的光学特性参数。并对T a2O5单层薄膜的厚度及折射率进行测量计算。实验结果表明,计算得到的光学特性参数值与实测结果相一致,厚度误差小于3nm,在540nm处折射率误差小于0.02。该方法具有操作简单、无损测量、计算速度快、精度高等优点,具有相当的实用性。     

用于大规模MIMO系统的改进CG检测算法

针对大规模多输入多输出(Multiple-Input Multiple-Output,MIMO)系统中近似最优线性最小均方误差(Minimum Mean Square Error,MMSE)算法复杂度过高问题,提出了RC-CG(Region Constellation-Conjugate Gradient)低复杂度近似最优信号检测算法。该算法首先利用共轭梯度(Conjugate Gradient,CG)迭代算法避免MMSE信号检测算法的高维度矩阵求逆,降低计算复杂度;其次引入二分查找算法对星座图进行区域分块,优化迭代初始解,使算法在保证原来检测性能的基础上加快收敛速度。仿真结果表明,该算法不仅可以达到近似MMSE算法的检测性能,而且适用于高阶调制,算法复杂度从O(K3)降低到O(K2)。     

基于数据驱动的微电网双层鲁棒优化调度

提出了一种基于数据驱动的微电网两阶段自适应鲁棒优化调度方法。首先,构建了基于数据驱动的微电网市场调度优化框架,利用K-means聚类方法对微电网大量历史数据进行聚类预处理,选取典型场景代表大量复杂场景来获得准确地风电出力概率分布情况。然后,在阶段一建立微电网日前预调度模型;基于预处理的聚类数据,建立数据驱动的风力发电的不确定性集合,在阶段二建立微电网实时调控模型。通过数据驱动构造的风力发电不确定性集合,排除了部分极端场景,降低了模型的保守度。接着,用列约束生成算法(C&CG)将构建的两阶段自适应鲁棒优化模型分解为主问题和子问题进行交互迭代求解。最后,仿真结果验证了所提方法的有效性,降低了微电网设备运行成本,提高了新能源利用率。