Perfect r-domination in the Kronecker product of two cycles, with an application to diagonal/toroidal mesh

If r?1, and m and n are each a multiple of (r+1)²+r², then each isomorphic component of C_m×C_n admits of a vertex partition into (r+1)²+r² perfect r-dominating sets. The result induces a dense packing of C_m×C_n by means of vertex-disjoint subgraphs, each isomorphic to a diagonal array. Areas of applications include efficient resource placement in a diagonal mesh and error-correcting codes.     

基于结构振动参数变化的损伤探测方法综述

综述了基于结构振动参数变化的损伤探测的方法，对现有的文献中的方法进行了分类和评述，重点介绍了当前急需的对复杂结构进行损伤探测的较为有效的方法，并对该领域在理论和实际应用中尚存在的问题进行了讨论，根据国内外最新的文献对这一领域未来的发展方向和趋势进行了展望。     

Event-based incremental updating of spatio-temporal database

Based on the relationship among the geographic events, spatial changes and the database operations, a new automatic (semi-automatic) incremental updating approach of spatio-temporal database (STDB) named as event-based incremental updating (E-BIU) is proposed in this paper. At first, the relationship among the events,spatial changes and the database operations is analyzed, then a total architecture of E-BIU implementation is de-signed, which includes an event queue, three managers and two sets of rules, each component is presented in detail.The process of the E-BIU of master STDB is described successively. An example of buildings incremental updating is given to illustrate this approach at the end. The result shows that E-BIU is an efficient automatic updating ap-proach for master STDB.     

加大技术改造力度,发挥流化床锅炉的巨大效益

针对流化床锅炉近年来在设计、制造、安装和运行等方面存在的一些不够完善和亟待解决的问题，强调对流化床锅炉进行技术改造和运行调整，才能改善环境质量，延长锅炉的使用寿命，提高锅炉运行的经济性。     

适合在线式增量更新的关联规则挖掘算法

在分析现有的关联规则算法FUP的基础上,指出了该算法的不足之处,进而提出了一种改进的增量式更新算法AUI,AUI算法解决了在线环境下最小支持度和最小置信度两个阈值不变而事务数据库发生变化时高效更新关联规则的问题。实验分析证明了新算法的有效性和优越性。     

Bayesian assessment of the characteristic concrete compressive strength using combined vague-informative priors

Bayesian statistics can be used in order to determine the characteristic value of an unknown distribution based on a limited number of test samples. In cases where no previous test results are available, most often a Bayesian method based on vague prior information is used. The assumption of a vague or uniform prior results in a conservative approach in cases where only a limited number of test results are available. However, in case of concrete, prior information on concrete strength can be found in literature or country-specific prior information can be determined. Therefore, the use of a combined vague-informative prior is of particular interest, more specifically in the form of scaled inverse-χ² distributions that can be used for updating the standard deviation of the strength distribution of concrete. The differences between the use of a vague and a combined vague-informative prior are investigated through Monte Carlo simulations. Because prior information is taken into account, the uncertainty regarding the standard deviation of the predictive strength distribution is significantly reduced.     

基于肤色模型和改进Adaboost算法的人脸检测

为提高人脸检测的精度,提出一种基于YCbCr肤色模型和Adaboost算法的人脸检测方法。利用YCbCr颜色空间的肤色阈值模型确定待检测区域。再利用Adaboost算法准确定位出人脸位置,并对Adaboost算法的训练过程提出一种新的权值更新方法,防止权值过分增大,避免了Adaboost算法训练过程中出现的“退化”现象。     

地形图缩编技术在地质调查底图生产中的应用

以武汉市城市地质调查底图生产项目为例,详细介绍了1：1万地形图更新缩编1：2．5万和1：5万地形图的技术路线,针对地形图缩编生产及质量检查中发现的问题,做了一些分析和探讨。总结了多种要素的更新缩编方法,从而极大减少手工工作量,提高生产效率,并结合生产流程中的部分环节和问题进行了思考与阐述。     

Concurrent multi-scale modelling and updating of long-span bridges using a multi-objective optimisation technique

This paper aims at developing an innovative technique of concurrent multi-objective optimisation for updating the multi-scale model of long-span bridges. A multi-scale model is established for the purpose of concurrently analysing the global response of the structure and nonlinear local damages in order to assess structural state and local damage evolution or deteriorating, respectively. A multi-objective optimisation technique is proposed in this work for concurrent multi-scale model updating, in which several key issues including the determination of the objective functions and constraint conditions, the multi-objective optimisation algorithm and how to find the optimal solution from many non-inferior solutions are studied. The proposed concurrent multi-objective optimisation technique is applied to update the initial multi-scale model of Runyang Suspension Bridge (RYSB) near Shanghai, and the updated model is validated by the data from the field tests conducted for obtaining the response in global (dynamic properties) and local levels.     

Modal testing as a means of quantitative monitoring of damage progression in a model FRP rehabilitated bridge deck system

Although substantial research has been conducted on the application of externally bonded fibre reinforced polymer (FRP) materials as a means of strengthening deficient and deteriorating concrete components most studies, and even field monitoring, have been at the component level. There is lack of data regarding the systems level response of strengthening. This paper reports on the results of an investigation of the effect of progressive strengthening of a slab-girder system through initial flexural strengthening of the decks followed by shear strengthening of the central girder. The progression of damage after each phase of loading was assessed through a process of forced vibration based modal testing. The paper focuses on modal testing and model updating procedures as a means of structural health monitoring and indicates that the process can be used effectively to accurately show changes in both local and global response through the different stages of loading. The procedures not only provide an assessment of damage progression and load redistribution in the rehabilitated components, but also enable an accurate representation of response at the systems and local (through support locations) levels.