An empirical examination of application frameworks success based on technology acceptance model

Framework-based development is currently regarded as one of the most promising software development approaches when it comes to improvements in lead time, productivity and quality. However, many frameworks and projects based on frameworks still report failures, which indicate that there are problems related to both frameworks technology and frameworks usage. The objective of our research was to examine the major drivers that have an impact on a framework’s acceptance and a framework’s success. We used the technology acceptance model (TAM) and Seddon’s information systems success model as our underlying theory. Data collected from an online survey of 389 active framework users was used to test hypothesized models. Data analysis was performed via structural equation modeling. Our findings support the post-adoption version of TAM and the relationship between continuous use and the successful use of systems, where more use also means more net benefits. We found that the successful use of frameworks is mainly dependent on two factors: continuous framework usage intention and the perceived usefulness of the framework. Several practical and theoretical implications can be foreseen including advances in framework development guidelines and insight into the relationship between the acceptance and success of frameworks.     

超高层建筑内部人员定位系统的研究与应用

超高层建筑防火是近年来公共安全领域的研究重点,而建筑物内部的人员定位则是其中的技术难点。依托具体科研项目,并以实际应用为出发点,开发出超高层建筑人员定位系统。介绍了系统的软、硬件开发平台,提出了超高层建筑室内定位的准则;重点分析了基于距离定位的三边测量法和三角形质心算法。仿真结果和误差分析表明:三角形质心算法更适合室内环境定位。     

基于BP神经网络的高层建筑工程成本造价评估模型

针对高层建筑造价评估准确性低的缺陷,提出基于BP神经网络的高层建筑工程成本造价评估模型。根据建设项目总体投资组成,对成本造价指数分类,确定整体造价修正系数,利用灰关联分析方法构建评估指标体系;根据BP神经网络结构,计算网络误差,并通过梯度下降方法定义输出层、隐含层的误差信号,获取网络权值调整公式;最后利用自适应学习率调节公式设置网络参数,将建筑工程中关键参数引入到输入层,建立最终的成本造价评估模型。仿真实验表明,所提方法可以利用较少的信息量准确快速地评估出高层建筑工程成本的最佳方案,具有较强非线性信息处理能力。     

业务应用软件框架的一种分析方法

为了开发成熟的、可重用的软件框架和组件,提倡尽量地抽出和组入软件模式.讨论了基于软件模式的面向对象软件开发方法.在分析业务应用领域需求规格的基础上,给出了软件框架的分析方法和基本角色模型,抽出了框架的体系结构分析模式、基本角色类及其结构并设计了数据存取的"抽象工厂”模式.该方法适用于应用框架和软组件的开发.     

面向Dataflow的异构集群混合式资源调度框架研究

Dataflow模型的使用,使得大数据计算的批处理和流处理融合为一体.但是,现有的针对大数据计算的集群资源调度框架,要么面向流处理,要么面向批处理,不适合批处理与流处理作业共享集群资源的需求.另外,GPU用于大数据分析计算时,由于缺乏有效的CPU-GPU资源解耦方式,降低了资源使用效率.在分析现有的集群资源调度框架的基础上,设计并实现了一种可以感知批处理/流处理应用的混合式资源调度框架HRM.它以共享状态架构为基础,采用乐观封锁协议和悲观封锁协议相结合的方式,确保流处理作业和批处理作业的不同资源要求.在计算节点上,提供CPU-GPU资源的灵活绑定,采用队列堆叠技术,不但满足流处理作业的实时性需求,也减少了反馈延迟并实现了GPU资源的共享.通过模拟大规模作业的调度,结果显示,HRM的调度延迟只有集中式调度框架的75%左右;使用实际负载测试,批处理与流处理共享集群时,使用HRM调度框架,CPU资源利用率提高25%以上;而使用细粒度作业调度方法,不但GPU利用率提高2倍以上,作业的完成时间也能够减少50%     

Interfacing the hardware API with a feature-based operating system family

Multiprocessor systems on a chip (MPSoCs) are a popular class of course-grained parallel computer architectures, which are very useful, because they support re-use of legacy software components and application-specific tailoring of hardware structures at the same time. Furthermore, model-driven design frameworks for MPSoCs such as Xilinx’ EDK or our own LavA-framework facilitate very fast system development. However, in this paper we argue that these design frameworks are not ideal from the development process perspective. Instead, we propose a software-centric approach that is based on the hardware API concept. The API is a representation of hardware components on the software level, which is generated from a hardware meta-model. It allows us to automatically derive a hardware structure based on access patterns in software, revealed by a static code analysis. This trick reduces the number of hardware details the developer needs to deal with and avoids configuration inconsistencies between the hardware and software levels by design. Furthermore, we present how the development process can benefit from the hardware API, when the API is interfaced with a configurable operating system.     

高耸柔性结构振动模态阻尼比参数识别仿真

针对当前结构振动模态阻尼比参数识别相关方法存在识别率低等问题,结合柔性结构振动形态复杂度高等特点,提出基于ERA的高耸柔性结构振动模态阻尼比参数识别方法。通过标定相机的内外参数,使用两个相机同时对柔性结构的动态进行拍摄生成结构测点图像,采用三维动态重构方法对高耸柔性结构振动情况进行预处理,利用Harris角点检测法确定振动位移,并采集位移数据,得到模态阻尼比参数集合。基于数据采集结果,通过ERA方法对高耸柔性结构振动模态阻尼比参数进行识别。实验结果表明,上述方法具有较强的识别性能、柔性结构振动形态简单的特点。     

Data-Flow Frameworks for Worst-Case Execution Time Analysis

The purpose of this paper is to introduce frameworks based on data-flow equations which estimate the worst-case execution time (WCET) of real-time programs. These frameworks allow several different WCET analysis techniques with various precisions, which range from naïve approaches to exact analysis, provided exact knowledge on the program behavior is available. In addition, data-flow frameworks can also be used for symbolic analysis based on information derived automatically from the source code of the program.     

Dynamics of frameworks by continuous mass method

The continuous mass matrix method has been extended to include the forced vibration in the dynamic analysis of plane and space frameworks. The forcing forces may be continuous of discontinuous functions of time but all the forcing forces acting simultaneously on a framework must have the same time variation in order that the modal analysis can be applied. The damping has been neglected. The concept of code numbers in the case of static loading has been extended to the dynamics of structures. The validity of the two orthogonality conditions of the modal shapes has been proved for the continuous mass matrix method so that the modal analysis could be applied easily. The set of simultaneous equations of motion has been converted to equivalent one-degree-of-freedom systems. In the case where the forcing forces have different time variation functions a numerical analysis can be performed. Illustrative sample problems have been solved and the results are given in tabular form.     

In-plane vibration of plates by continuous mass matrix method

The continuous mass matrix method derived for frameworks is extended to the analysis of in-plane vibration of plates. A continuous mass distribution which is the same as the actual mass distribution of the plate is considered over each rectangular finite element. Taking into account that the rigid body movement produces inertial forces in dynamic analysis for a rectangular plate element eight independent conditions are provided to satisfy eight independent freedoms. Each condition is obtained from an independent displacement distribution satisfying the equations of motion at any point of the element and not only at the nodes of the rectangle. The dynamic element stiffness matrix thus obtained is a function of the natural circular frequency. The limit of the dynamic element stiffness matrix when the value of the natural circular frequency tends to zero is the static, stress compatible element stiffness matrix. The analysis of plates under forcing forces is performed by modal analysis after the natural circular frequencies and the corresponding modal shapes have been obtained from the free vibrations, for all the forcing forces are assumed to be function of the same time variation. Otherwise one must recur to a numerical analysis. The effect of the sizes, number of the meshes, the additional static load on the plate and the rigidity of the boundaries on the vibration of the plate is discussed. Few example problems are solved in order to illustrate the above mentioned effects. The numerical results obtained by continuous mass matrix method are compared with those of consistent mass matrix method. The convergence in terms of the sizes of meshes and the limit of convergence are examined.     

Discrete analysis method for random vibration of structures subjected to spatially correlated filtered white noises

Random vibration analysis of large-span space structures or high-rise structures which are subjected to spatially correlated filtered white noise excitations such as wind load and earthquake motion, has been a difficult problem in engineering computation. Based on the idea of the discrete analysis method of random vibration, this paper attempts to solve this problem. The formulae of calculating structural mean and mean square responses are given. As an example, the wind-induced vibration of a cable roof structure is analysed by using these formulae.     

Vibration Control of a High-Rise Building Structure: Theory and Experiment

In this study, an innovative solution is developed for vibration suppression of the high-rise building. The infinite dimensional system model has been presented for describing high-rise building structures which have a large inertial load with the help of the Hamilton’s principle. On the basis of this system model and with the use of the Lyapunov’s direct method, a boundary controller is proposed and the closed-loop system is uniformly bounded in the time domain. Finally, by using the Smart Structure laboratory platform which is produced by Quancer, we conduct a set of experiments and find that the designed method is resultful.      

基于并行云计算模式的建筑结构设计

在建筑结构并行计算与云计算相结合的基础上,提出了结合两种计算技术的软硬件结构及应用方法.云计算及并行计算技术的结合为超高、超长、大跨度复杂建筑工程计算问题提供了实现高效能计算的可能.理论分析表明,该方法优于传统的并行计算技术,能够为实现建筑结构的高效能计算提供新思路.     

A review on E-business Interoperability Frameworks

Interoperability frameworks present a set of assumptions, concepts, values, and practices that constitute a method of dealing with interoperability issues in the electronic business (e-business) context. Achieving interoperability in the e-business generates numerous benefits. Thus, interoperability frameworks are the main component of e-business activities. This paper describes the existing interoperability frameworks for e-business, and performs a comparative analysis among their findings to determine the similarities and differences in their philosophy and implementation. This analysis yields a set of recommendations for any party that is open to the idea of creating or improving an E-business Interoperability Framework.     

基于遗传算法的多目标电梯紧急疏散问题

(超)高层建筑高度的增加,使得人们仅通过楼梯间疏散的时间显著增加.电梯技术的提高使得在发生突发事件时使用电梯辅助疏散技术成为可能,这样可以极大提高建筑中人员疏散效率和安全性.仅考虑疏散时间最短的单电梯紧急疏散调度问题(Single Elevator Scheduling for Emergency Evacuation,S-ESEE)已经被证明是NP难问题,但模型中未考虑电梯数量的限制.本文提出一种最小化疏散时间和往返次数的多目标模型,并采用遗传算法计算避免陷入局部最优解,并且为节省运算时间将人群数量、电梯停靠损失等固定值单独计算,通过增加电梯停靠约束降低算法时间复杂度.通过数值分析结果表明:在楼层数较少时,两种算法差别不大;但随着疏散楼层数量的增加,本文算法可以获得更优解.     

一种基于情感句模的文本情感分类方法

考虑到同类型的情感句往往具有相同或者相似的句法和语义表达模式,该文提出了一种基于情感句模的文本情感自动分类方法。首先,将情感表达相关句模人工分为3大类105个二级分类;然后,设计了一种利用依存特征、句法特征和同义词特征的句模获取方法,从标注情感句中半自动地获取情感句模。最后,通过对输入句进行情感句模分类实现文本情感分类。在NLP&CC2013中文微博情绪分类评测语料及RenCECps博客语料的实验结果显示,该文提出的分类方法准确率显著高于基于词特征支持向量机分类器。     

基于物联网的建筑设备的智能终端研究

伴随着经济的发展,国内的高层建筑和超高层建筑也越来越多,相应的建筑设备也不断增加,如何对这些高层建筑的建筑设备进行有效的管理,使其更加智能、节能,是建筑设备管理的重中之重。在以前大部分建筑设备的管理都是采用传统的方法,传统方法耗时耗力,反应缓慢,控制性差,稳定性差,更容易引发安全问题。相比之下基于物联网的建筑设备的管理方法,在建筑设备管理方面比传统方法拥有巨大优势,不但能降低建筑设备能耗、灵活方便地控制建筑设备,而且安全稳定。论文介绍了基于物联网的建筑设备管理系统结构,并对系统中的智能终端部分做了研究,对智能终端设计提出了解决方案,为提高建筑设备智能化管理水平具有一定的参考价值。     

基于Struts+Spring+iBATIS的轻量级Web应用框架研究

在分析基于J2EE的重量级Web应用系统开发面临的一系列问题的基础上,对当前流行的Web应用框架进行比较,给出基于Struts,Spring和iBATIS的轻量级开发策略,简称"SSi".通过对三种框架技术特点的分析,设计出集成三种框架技术的Web应用框架,并通过一个成功案例,对开发过程中几个关键点的实现进行阐述,为采用此集成框架进行Web应用系统的设计与开发提供参考.     

Analysis/design of multistory concrete buildings on microcomputers

A computer-aided, integrated, interactive system is developed for the analysis and design of high-rise concrete buildings under vertical, wind and earthquake loads on microcomputers. This system fulfills the need for: new approaches for input and output efficiency as they affect design operation, communication between users and hardwares, problem verification when large scale data input is involved. The system presented has several advantages: no restrictions are imposed on the number of buildings to be solved in the same run, it is a “user-friendly” system, it is interactively implemented, it requires no particular type of professional, it runs with any boundary condition, a typical run can be: analysis then design, or analysis only, or design only. Also, the input data can be checked very easily. In this manner, every participant in a project will provide a share towards this integration with no need to repeat work unnecessarily.Two phases are included. In the first one, geometry is computed or revised, eight loading cases in addition to wind and earthquake loads are considered and only analysis is conducted. In the second phase, the design is done with five options for every section. Members under concentric or eccentric loads, flexure, combined shear and torsion, combined shear and diagonal tension are considered.With the present system, two high-rise buildings were analyzed and designed. The first buildings three different shear walls and is subjected to wind loads. The second building is composed of interconnected frames and is under earthquake loads.