解释结构模型在图书采购质量分析及控制中的应用     

史艳芬 《图书情报工作》2012,56(5):94-142

采用系统工程中解释结构模型法对影响高校图书馆图书采购质量的诸多因素进行分析,通过建立有向图和矩阵运算生成模型,分析各种因素的层级和相互关系,指出图书采购质量的三层影响因素及其之间的相互关系,建立图书采购质量控制影响因素的解释结构模型。根据模型揭示出影响图书采购质量的根源因素、中间因素和表象因素,并针对因素的层级关系提出相应的图书采购质量控制方法,从而促进图书采购质量的提高。  相似文献   

微内容序化方法与应用实例     

张乾  蔡淑琴  石双元 《图书情报工作》2012,56(8):38-41

以Web2.0技术产生的微内容杂乱无序、难以利用的问题为出发点,应用信息组织理论和序化思想,研究如何对微内容进行汇总、序化加工,形成有序的、易于理解与利用的综合信息,包括：设计对微内容加工的方法,构建Web2.0信息加工框架,为Web2.0网站建设及改进提供依据,并探索微内容信息利用的方式。  相似文献   

信息企业与知识型企业耦合评价研究     

史丽萍  刘强  唐书林 《图书情报工作》2012,56(10):89-94

从信息和知识的嵌入特性、信息企业和知识型企业的能力属性、信息企业和知识型企业的活动特性入手,剖析信息企业与知识型企业的耦合关系,分析耦合媒介和耦合点,在此基础上构建信息企业和知识型企业耦合评价模型,对信息企业和知识型企业的耦合关系做出客观的评价,以期为促进信息企业与知识型企业耦合打下坚实的理论和实践基础。  相似文献   

山区高速公路路基设计          下载免费PDF全文

林上顺  刘碧容  史嵩松 《福建工程学院学报》2015,(3):216-222

由于山区高速公路地形、地貌、地质、水文条件的复杂性,其路基工程的设计较为复杂且难度较大。以松建高速公路建设为例,对山区高速公路路基设计方案和全过程动态设计理念进行介绍。本项目在工程设计阶段重视现场地形、地质等资料的收集,结合以往的工程经验,有针对性地开展精心细致的设计;在施工过程中,及时根据现场实际情况的变化,对原设计方案进行合理调整,为工程施工的顺利进行创造条件,同时进一步提升了设计成果的质量。实践表明,本项目的设计方案和设计理念具有明显的优越性,对今后类似工程的设计具有参考意义。  相似文献   

高校图书馆空间规划方法——以同济大学图书馆为例     

史艳芬  徐忠明  徐咏华 《图书情报工作》2018,62(16):28-34

[目的/意义]"双一流"建设背景下,高校图书馆的基本要素"人、资源、空间"已发生重大变化,同济大学图书馆基于用户需求研究图书馆空间规划策略,为图书馆的服务创新和业务转型提供支撑和可行性方案。[方法/过程]探索图书馆空间规划设计需求分析方法,通过内容分析、案例研究、调查问卷等方法了解图书馆发展趋势和用户需求,基于需求分析提出新空间布局的关键要素、功能布局、特征及框架,为同济大学图书馆的创新发展提出可行性建议。[结果/结论]空间服务已成为未来图书馆发展的重要服务模式,探索高校图书馆空间规划方法及关键要素,提出基于用户的空间规划框架,有助于提升图书馆服务创新能力。  相似文献   

Soft sensor modeling with a selective updating strategy for Gaussian process regression based on probabilistic principle component analysis     

Weili Xiong  Xudong Shi 《Journal of The Franklin Institute》2018,355(12):5336-5349

Considering the deviation of the working condition and the high updating frequency of the traditional moving window methods, this paper proposes a selective strategy of moving window for the Gaussian process regression in the latent probabilistic component space. First, the probabilistic principle component analysis (PPCA) is employed to deal with the multi-dimensional issue and extract essential information of the process data. Because the latent probabilistic components are more sensitive to the deviation of the working condition in the industrial process than the original data, the regression performance is improved under the PPCA framework. Under the proposed strategy, the soft sensor is able to detect the change of the working condition, and the updating is activated only when the predicted error exceeds the preset threshold, otherwise the model is kept unchanged. Furthermore, the promotion of both predicted accuracy and efficiency can be obtained by regulating the threshold. To test the effectiveness of the proposed method, a wastewater case study is provided, and the result shows that the proposed strategy works better under the probabilistic than other conventional methods.  相似文献   

Reachable set estimation for discrete-time bilinear systems with time-varying delays     

Jiangrong Li  Zhiguang Feng  Yuxin Zhao  Juan Shi 《Journal of The Franklin Institute》2018,355(13):5721-5735

The problem of reachable set estimation is studied for discrete-time bilinear system in this paper. Time-varying delays and bounded input disturbances are both considered in bilinear system. The aim is to find reachable set that converges from all the states of system with initial conditions. By constructing Lyapunov–Krasovskii functional, sufficient delay-dependent less conservative stable conditions of reachable set estimation are obtained for bilinear delay system via the reciprocally convex combination and delay partition approaches. The derived theorem can guarantee that all the states of system with initial conditions from some domain are bounded in an ellipsoid and all the states from other domain are converged exponentially within a ball. One simulation example is presented to illustrate the correctness of the derived result in this paper.  相似文献   

Optimal jamming attack schedule for remote state estimation with two sensors     

Lianghong Peng  Xianghui Cao  Hongbao Shi  Changyin Sun 《Journal of The Franklin Institute》2018,355(14):6859-6876

In cyber-physical systems (CPS), cyber threats emerge in many ways which can cause significant destruction to the system operation. In wireless CPS, adversaries can block the communications of useful information by channel jamming, incurring the so-called denial of service (DoS) attacks. In this paper, we investigate the problem of optimal jamming attack scheduling against remote state estimation wireless network. Specifically, we consider that two wireless sensors report data to a remote estimator through two wireless communication channels lying in two unoverlapping frequency bands, respectively. Meanwhile, an adversary can select one and only one channel at a time to execute jamming attack. We prove that the optimal attack schedule is continuously launching attack on one channel determined based on the system dynamics matrix. The theoretical results are validated by numerical simulations.  相似文献   

Adaptive fault-tolerant control for continuous-time Markovian jump systems with signal quantization     

Dongyang Zhao  Yu Liu  Ming Liu  Jinyong Yu  Yan Shi 《Journal of The Franklin Institute》2018,355(6):2987-3009

This paper investigates the adaptive fault-tolerant control problem for a class of continuous-time Markovian jump systems with digital communication constraints, parameter uncertainty, disturbance and actuator faults. In this study, the exact information for actuator fault, disturbance and the unparametrisable time-varying stuck fault are totally unknown. The dynamical uniform quantizer is utilized to perform the design work and the mismatched initializations at the coder and decoder sides are also considered. In this paper, a novel quantized adaptive fault-tolerant control design method is proposed to eliminate the effects of actuator fault, parameter uncertainty and disturbance. Moreover, it can be proved that the solutions of the overall closed-loop system are uniformly bounded, which is asymptotically stable almost surely. Finally, numerical examples are provided to verify the effectiveness of the new methodology.  相似文献   

大学生安心游泳技能等级标准研制     

王斌  于洪涛  罗时  张辉 《武汉体育学院学报》2018,52(3):89-95

建立以大学生为评价对象,以提高防溺水技能和规避溺水风险为目的的大学生安心游泳技能等级标准。通过专家访谈、问卷调查、问卷筛选以及专家论证等研究方法,确定了大学生安心游泳技能等级评价标准,该标准包括游泳技能和自救技能两个方面,并使用3个层级（初级、中级、高级）9个等级（初级：1-3级;中级：4-6级;高级7-9级）来评价大学生安心游泳技能的等级。通过内回代方法对评价标准进行检验,表明该研究标准能够初步应用于大学生安心游泳技能等级评价。  相似文献