Application of ACO algorithm in protein structure prediction

The hydrophobic-polar (HP) lattice model is an important simplified model for studying protein folding. In this paper, we present an improved ACO algorithm for the protein structure prediction. In the algorithm, the "lone"ethod is applied to deal with the infeasible structures, and the "oint mutation and reconstruction"ethod is applied in local search phase. The empirical results show that the presented method is feasible and effective to solve the problem of protein structure prediction, and notable improvements in CPU time are obtained.     

蓄能器在全液压注塑机的应用以及节能效果研究

为了节约传统液压注塑机液压阀溢流损耗能量,对传统的全液压注塑机的油路进行改造,加入自行研制的蓄能器节能模块;对改造完成的节能注塑机进行能耗测试并与未改造的传统注塑机进行能耗比较,发现蓄能器模块加入液压注塑机后的整机能耗有明显降低,能实现预期的节能降耗目的;在不同的塑化注射压力下、不同的塑化背压下、不同保压时间下,对节约能耗数据进行测量分析,并从机理上分析能耗数据的差异,研究蓄能器模块使液压注塑机能耗降低的原因.     

Adsorption breakthrough of benzene in the fixed bed of modified activated carbon under different humidity conditions

The breakthrough curves of benzene and water on modified activated carbons (ACs) were investigated. Temperature-programmed desorption (TPD) experiments were conducted to measure the TPD curves of benzene and water on modified and unmodified ACs and to estimate the activation energy for the desorption of benzene on the modified ACs. Starting with unmodified ACs, two modified ACs were prepared by using two different types of silane, designated by KH560 and 1706. The results showed that the activation energy for the desorption of benzene on KH560/AC and 1706/AC was higher than that on unmodified AC. In addition, the activation energy for the desorption of water on KH560/AC and 1706/AC was lower than that on unmodified AC. The breakthrough curves of benzene obtained from the experimental observations under different humidity conditions were compared with the results of the TPD experiments. The results show that the modified ACs are less affected by water, whereas the unmodified ACs are more affected by water, indicating that surface modification by organosilane compounds can improve the adsorption of benzene on the activated carbo, which weakens the adsorption of water.     

基于改进型类间方差分割的红外目标提取算法

文章对最大类间方差法进行了改进,利用计算图像类间方差的约束条件,通过构造罚函数,把求最大类间方差问题转换为求带约束条件的函数最优解问题,再用迭代法对图像进行分割,从而有效地弥补了最大类间方差法对图像噪音和目标大小敏感不足。仿真实验结果表明,该方法效果良好。     

一种高效的电子政务系统的设计与应用

计算机网络技术的出现,全球信息化改变着人们的生活方式,世界各国高度重视发展电子政务,它是一个国家及城市竞争力水平的标志之一.在这样严峻的社会形势下,建立一个高效的电子政务系统是十分必要的.首先,分析了建立电子政务系统的必要性、特点、功能;然后,提出了电子政务系统的体系模型,设计出了功能结构图和网络结构图,详细地描述了方案思路;最后,把此模型应用到商洛市旅游行业中,经过调查数据研究分析,政务系统的出现给旅游业带来巨大的变化,整个城市的经济、影响力大幅度上升.     

微信加密通信原理分析简

基于移动客户端的保密通信原理,本文讨论了现阶段主流社交软件微信系统的通信方式和加密原理,其基于RSA加密、随机AES私钥的加密方式设计是通信保密的关键核心,也是目前绝大部分移动端社交软件的主流加密方式。     

Mathematical model of shear rate of polymer melt dynamic extruding through capillary

With superimposing a sine vibration of displacement on the extruding direction of a polymer melt, the characterization formula of the shear rate of a polymer melt within a capillary was set up. By making use of the experimental equipment of a constant velocity type dynamic rheometer of capillary (CVDRC) designed by the authors, the calculating steps of the shear rate of the polymer melt at the wall of the capillary under a vibration force field were established. Through measuring and analyzing the instantaneous data of capillary entry pressure, capillary volume rate, and their phase‐difference under the superimposed vibration, the polymer melt's shear rate at the wall of the capillary can thus be calculated. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 95: 1056–1061, 2005     

FGTO — A fine structured GTO-thyristor with improved switching characteristics

Contents A fine structured GTO thyristor, abbreviated FGTO, has been developed to improve the switching characteristics. The new device has a cathode finger width of only 20 m and can be turned off without a negative gate bias at an anode current level of more than 200 A/cm². The turn-off time can be shortened down tot _off 500 ns by increasing the negative gate current. A snubber circuit is not necessary to turn off the FGTO's. The maximum rate of rise of anode voltage du/dl reaches more than 10 kV/s. Analytical models are developed to describe the turn-off transients of the FGTO's. Good agreement between the theoretical and experimental results could be achieved.

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FGTO — Ein feinstrukturierter GTO-Thyristor mit verbessertem Schaltverhalten

Übersicht Zur Verbesserung des Schaltverhaltens ist ein feinstrukturierter GTO-Thyristor, abgekürzt FGTO, entwickelt worden. Dieses neue Bauelement hat eine Kathoden-streifenbreite von nur 20 m und kann ohne negative Gatevorspannung bei einer Anodenstromdichte von mehr als 200 A/cm² abgeschaltet werden. Die Abschaltzeit läßt sich durch Erhöhung des negativen Gatestroms bis zut _off 500 ns verkürzen. Beim Abschalten von FGTOs ist keine RC-Beschaltung erforderlich. Der maximale du/dl-Wert erreicht mehr als 10 kV/s. Zur Beschreibung des Abschalt-verhaltens von FGTOs werden analytische Modelle entwickelt, die eine gute Übereinstimmung mit den Meßergebnissen liefern.

     

改进R-FCN模型的小尺度行人检测

目的 为了有效解决传统行人检测算法在分辨率低、行人尺寸较小等情境下检测精度低的问题,将基于区域全卷积网络（region-based fully convolutional networks,R-FCN）的目标检测算法引入到行人检测中,提出一种改进R-FCN模型的小尺度行人检测算法。方法 为了使特征提取更加准确,在ResNet-101的conv5阶段中嵌入可变形卷积层,扩大特征图的感受野;为提高小尺寸行人检测精度,在ResNet-101中增加另一条检测路径,对不同尺寸大小的特征图进行感兴趣区域池化;为解决小尺寸行人检测中的误检问题,利用自举策略的非极大值抑制算法代替传统的非极大值抑制算法。结果 在基准数据集Caltech上进行评估,实验表明,改进的R-FCN算法与具有代表性的单阶段检测器（single shot multiBox detector,SSD）算法和两阶段检测器中的Faster R-CNN（region convolutional neural network）算法相比,检测精度分别提高了3.29%和2.78%;在相同ResNet-101基础网络下,检测精度比原始R-FCN算法提高了12.10%。结论 本文提出的改进R-FCN模型,使小尺寸行人检测精度更加准确。相比原始模型,改进的R-FCN模型对行人检测的精确率和召回率有更好的平衡能力,在保证精确率的同时,具有更大的召回率。     

A novel NMF-based authentication scheme for encrypted speech in cloud computing

Multimedia Tools and Applications - Authentication of encrypted speeches is a technique that can judge the integrity of encrypted speech in cloud computing, even the encrypted speeches have been...