基于主客观权重的异构网络选择算法

为了解决在异构网络环境选择最佳的接入网络的问题,提出一种结合综合赋权的异构网络选择算法.在用户端采用层次分析法判断用户偏好,在网络端采用基于指标相关性的客观赋权法判断网络客观状态,结合基于离差极小化的综合赋权法得到最终权重,并运用理想值近似排序法进行网络排序,接入最佳网络.基于matlab的仿真结果表明：该方法能根据不同业务结合网络性能及用户需求,减少频繁切换,提高网络的选择结果的合理性和有效性.     

基于卡尔曼滤波的理想着舰点垂向运动估计

为了满足无人机着舰的高精度需求, 提高对航母运动的预报精度, 研究了甲板运动预估技术。利用有理形式的成型滤波器引入白噪声作为系统输入, 以拟合航母俯仰运动, 运用卡尔曼滤波理论对航母甲板的俯仰运动进行了预估; 并在此基础上, 结合对甲板升沉及横滚运动的预估结果, 实现对理想着舰点垂向运动的预估。仿真结果表明, 能够有效将航母甲板的俯仰运动及理想着舰点垂向运动提前3秒预报, 对提高着舰安全性有着重要意义。     

四川某滑坡形成机制分析及稳定性评价

研究了四川某滑坡体的基本地质特征,分析了该滑坡形成机制,应用传递系数法,计算了该滑坡体在自然、暴雨和地震三种工况下的稳定性,结合工程实际,提出了采用抗滑桩支挡,地表排水和加强监测等有效防治该滑坡的措施。     

Performance-based prioritisation for seismic retrofitting of reinforced concrete bridge bent

In this study, a seismically deficient three-column reinforced concrete bridge bent has been considered which was designed in the pre-1965. Several retrofitting provisions, namely carbon-fibre-reinforced plastics jacketing, steel jacketing, concrete jacketing, and engineered cementitious composites jacketing, have been considered in this study to enhance the seismic resistance and the performance of a gravity load-designed bridge bent under seismic forces. Performance evaluation and optimal selection of retrofit techniques have multi-level and multi-factor features and, therefore, are regarded as multiple criteria decision-making (MCDM) problem. MCDM methods are decision-support procedures, which are used when there are multiple decision-makers involved in the evaluation and comparison of a set of alternatives involving different evaluation criteria. This paper shows the application of such methodological framework for a performance-based seismic retrofit selection of a multi-column bridge bent. Here, different seismic retrofit strategies, reflecting common as well as innovative approaches, are adopted, and their seismic performances are compared by using the technique for order preference by similarity to ideal solution MCDM algorithm. Through rigorous analyses, a decision-making tool has been developed to identify the most effective retrofitting scheme considering its seismic performance alone.     

动态多指标决策法在油气田开发方案中的应用

针对油气田开发方案的优选问题,提出了动态多指标决策法,在指标、方案两种因素的基础上,增加了时间因素,将决策论中的理想矩阵由二维扩展到三维,通过进行矩阵规范化、求其相对增长率,矩阵集结等,又将三维决策问题转化为二维决策问题来解决,最后由正负理想矩阵求解各方案的贴近度,得到最终决策排序结果,从而优选出油气田开发的最优方案。方法克服了以往只考虑指标属性值或指标增长率的弊端,具有很好的实用性。     

甘肃省暴雨洪水灾害的特点及防治对策

甘肃省生态与环境脆弱，暴雨及其引发的洪水灾害造成的损失十分严重。甘肃省暴雨类型主要有锋面或涡切变型暴雨、雷阵雨型暴雨和混合型暴雨三类，一般发生在5—9月，大暴雨发生在7,8月份。针对甘肃省洪水灾害的特点，提出暴雨洪水的防治对策，包括加强水库工程管理，堤防的管理维护，开展小流域综合治理的工程措施和落实行政首长负责制．提高水文气象监测及预报能力等非工程措施。     

An Improved Real-Quadratic-Field-Based Key Exchange Procedure

To date, the only non-group structure that has been suitably employed as the key space for Diffie-Hellman-type cryptographic key exchange is the infrastructure of a real quadratic (number or function) field. We present an implementation of a Diffie-Hellman-type protocol based on real quadratic number field arithmetic that provides a significant improvement in performance over previous versions of this scheme. This dramatic speed-up is achieved by replacing the ordinary multiplication and reduction procedures for reduced ideals by a new version of the NUCOMP algorithm due to Shanks.     

Wetting/dewetting transition of two-phase flows in nano-corrugated channels

A lattice version of the Boltzmann kinetic equation for describing multi-phase flows in nano- and micro-corrugated devices is reviewed. To this purpose, the Shan-Chen Lattice Boltzmann model [Phys. Rev. E 47, 1815 (1993)] for non-ideal fluids is extended to the case of confined geometries with hydrophobic properties on the wall. This extended Shan-Chen method is applied for the simulation of the wetting/dewetting transition in the presence of nanoscopic grooves etched on the boundaries. This approach permits to retain the essential supra-molecular details of fluid-solid interactions without surrendering -in fact boosting- the computational efficiency of continuum methods. The method is first validated against the Molecular Dynamics (MD) results of Cottin-Bizonne et al. [Nature Mater. 2, 237 (2003)] and then applied to more complex geometries, hardly accessible to MD simulations. The resulting analysis confirms that surface roughness and capillary effects can promote a sizeable reduction of the flow drag, with a substantial enhancement of the mass flow rates and slip-lengths, which can reach up to the micrometric range for highly hydrophobic surfaces. This article is to be regarded part of the first Synergy Between Experiment and Computation in Nanoscale Science (NNIN/C) conference held in Cambridge, Massachusetts, U.S.A., 31 May–3 June 2006 proceedings published in the Journal of Computer-Aided Materials Design, Volume 14, No. 1, 2007.     

Ab initio DFT study of ideal shear strength of polytypes of silicon carbide

Ab initio density functional calculations are performed to investigate the ideal shear deformation of SiC polytypes (3C, 2H, 4H, and 6H). The deformation of the cubic and the hexagonal polytypes in small strain region can be well represented by the elastic properties of component Si₄C-tetrahedrons. The stacking pattern in the polytypes affects strain localization, which is correlated with the generalized stacking fault energy profile of each shuffle-set plane, and the ideal shear strength. Compressive hydrostatic stress decreases the ideal shear strength, which is in contrast with the behavior of metals. __________ Translated from Problemy Prochnosti, No. 1, pp. 8–13, January–February, 2008.     

结构矩阵近环S(B,N_0)中的理想和素理想(英文)

依据保序映射刻划出结构矩阵近环S(B ,N0 )的理想及素理想特征