基于RBAC的B/S权限管理的研究与应用

介绍基于角色的访问控制模型的理论基础与特点,结合宽带增值业务管理系统的开发,阐述系统在权限管理方面的设计思路和实现方法,并对该系统的用户识别和权限验证进行了研究.     

企业建立品牌的必要性

简要介绍了品牌的定义及品牌在市场营销中的作用、意义,分析了工业企业品牌与消费企业品牌的不同之处,提出工业企业建立品牌的必要性及其作用。     

铁路行包链接式运输方案优化编制系统的研究

链接式运输方案是一种基于时效的行包运输方案,是时效运输产品日常运输组织的依据.链接式运输方案优化编制系统采用面向对象的软件设计方法,设计基于数据驱动的开放式软件架构,包括数据库、数据维护、方案管理、方案编制、数据计算引擎以及数据交换接口.该架构以数据计算引擎为核心,数据计算引擎与方案编制等数据展现模块相对独立,可以较好地适应外部环境变化对系统造成的影响,也可以通过开发新的数据计算引擎的方式来完善系统方案生成的优化技术和方法.     

陆地巡洋舰(4700)防盗系统的故障诊断

介绍了丰田陆地巡洋舰汽车防盗系统故障诊断的部位、检查电路及检查的程序。     

解释结构模型在城市交通管理中的应用——以西安、汉中两市为例

借用系统工程中解释结构模型(ISM),以西安、汉中两市交通问题为例建立其ISM并进行系统分析;可以看出城市交通问题不在于道路本身等级低、行车空间不足这类硬件设施,而在于其交通运营的管理工作没有做到先进、高效、有力,造成了现在交通问题的突出。     

PERIPANCREATIC ARTERIAL LIGATION COMBINED WITH ARTERIAL INFUSION REGIONAL CHEMOTHERAPY FOR TREATING PATIENTS WITH ADVANCED PANCREATIC CARCINOMA

Ｔｈｅｄｅｔｅｃｔｉｏｎｒａｔｅｏｆｒｅｓｅｃｔａｂｌｅｓｍａｌｌｐａｎｃｒｅａｔｉｃｃａｒ ｃｉｎｏｍａｉｓｉｎｃｒｅａｓｉｎｇａｓａｒｅｓｕｌｔｏｆｒｅｃｅｎｔａｄｖａｎｃｅｓｉｎｖａｒｉ ｏｕｓｄｉａｇｎｏｓｔｉｃｉｍａｇｉｎｇｔｅｃｈｎｉｑｕｅｓ,ｈｏｗｅｖｅｒ ,ｒｅｓｅｃｔｉｏｎａｔｔｈｅｔｉｍｅｏｆｄｉａｇｎｏｓｉｓｉｓｐｏｓｓｉｂｌｅｉｎｏｎｌｙ 5 %- 2 2 %ｏｆｔｈｅｐａｔｉｅｎｔｓ[1] ,ａｎｄｍｏｓｔｏｆｔｈｅｐａｔｉｅｎｔｓｂｅｌｏｎｇｔｏａｄｖａｎｃｅｄｐａｎｃｒｅａｔｉｃｃａｒ…     

基于导航网格的室内火灾逃生路径动态规划

为了解决现有虚拟现实（virtual reality,VR）场景中室内火灾逃生路径规划静态、低效的问题,基于VR场景中的导航网格,提出了室内火灾真实感表达方法,构建了室内火灾VR场景;其次根据VR场景创建了初始导航网格,设计了导航网格动态生成算法,建立了室内火灾逃生路径动态规划方法;最后构建了原型系统,并选择某产业园展厅作为案例开展了实验分析. 实验结果表明:融合静态地理场景与动态火灾场景,能构建室内火灾VR场景;导航网格每次更新时间在10 ms内,逃生路径规划的每次更新时间平均为50 ms左右,可支持室内火灾逃生路径的动态规划.      

共享单车现金奖励调度策略的用户接受意愿研究

为探讨共享单车用户在不同影响因素下对现金奖励调度策略的接受程度,设定了针对共享单车用户的调查问卷,并在济南市进行了调查,得到519份有效问卷。基于扩展的计划行为理论（Extended Theory of Planned Behavior, ETPB）模型和相关结构方程模型（Structural Equation Model, SEM）,设定了社会规范、支付能力、体力、感知服务、感知绿色价值5个构念以及5个相关假定,以测度不同奖励调度情境下共享单车用户对奖励策略的接受程度。结果显示,支付能力和体力对用户接受调度的影响程度最大,其次是社会规范和感知服务,感知绿色价值的影响程度最小。在此基础之上,提出了增大站点密度、实行现金奖励及提高车辆质量等建议,以降低运营成本、提升用户满意度与车辆使用率。     

Compensation of pressure enthalpy effects on temperature fields for throttling of high-pressure real gas

For the pressure enthalpy of high pressure pneumatics, the computational fluid dynamics (CFD) simulation based on ideal gas assumption fails to obtain the real temperature information. Therefore, we propose a method to compensate the pressure enthalpy of throttling for CFD simulation based on ideal gas assumption. Firstly, the pressure enthalpy is calculated for the pressure range of 0.101 to 30 MPa and the temperature range of 190 to 298 K based on Soave-Redlich-Kwong (S-R-K) equation. Then, a polynomial fitting equation is applied to practical application in the above mentioned range. The basic idea of the compensation method is to convert the pressure enthalpy difference between inlet air and nodes into the compensation temperature. In the above temperature and pressure range, the compensated temperature is close to the real one, and the relative temperature drop error is below 10%. This error is mainly caused by the velocity difference of the orifice between the real and ideal gas models. Finally, this compensation method performs an icing analysis for practical high pressure slide pilot valve.     

Effect of orthogonal stiffeners on the stability of axially compressed steel jacking pipe

Load conditions for steel pipe-jacking are complex during the construction stage. The stability of steel jacking pipe has been an increasingly important problem as jacking forces, pipe diameters and jacking distances increase. However, there are no standards for pipe reinforcement, for prevention of buckling, or for remedying pipe that buckles when being jacked axially. Past experience suggests that stiffeners can effectively reinforce the structure. This study analyzes the effect of different stiffeners on the stability of steel jacking pipe under axial compression using finite element analysis. The results suggest that the stability of steel jacking pipe can be significantly improved by using orthogonal stiffeners, in terms of engineering costs and construction space inside the pipe. Based on current engineering practice, the application of orthogonal stiffeners is discussed. This study provides a useful reference for the design and construction of steel jacking pipe.