一种个性化的可信服务选择方法(英文)

为了充分体现Web服务的可信性特征和用户偏好在服务选择中的作用,提高服务选择过程的可信性,提出一种个性化的可信服务选择方法.定义Web服务可信性为按需定制的多维信任评估指标,用户偏好用各维信任指标的权重值体现.提出一种层次分析法和偏好排序组织法相结合的服务选择方法.层次分析法用于计算基于用户偏好的信任指标权重值,根据信任评估指标构建层级结构,构造成对比较矩阵,求解矩阵最大特征值和特征向量获得信任指标权重.偏好排序组织法用于对候选服务进行排序,根据各维信任指标的内在特征选择合适的偏好函数,计算候选服务的净流值获得服务排序.实验结果表明该方法可以有效地体现用户个性化的信任需求,有效提高服务排序和选择的可信性.     

探索一种有效、可持续的高等教育移动学习框架

由于移动技术在高等教育中的作用日益重要,因此必须探索相应的理论框架,为可持续使用移动技术开展有效的教与学活动提供坚实基础。本文回顾总结了2005年以来所出现的三种有影响却又明显不同的移动学习理论,并从两个方面对它们进行比较和对比,即它们所采用的移动学习定义的性质以及与作为其理论框架基础的现有学习理论和教学理念之间的关系。本文根据文献分析结果提出了创建一种实用的移动学习评估框架(Mobile Learning Evaluation Framework,简称MLEF)的方法,该框架适用于各种环境并具备足够灵活性以适应新兴移动技术的使用。这一课题已在进行中,预期2015年完成。     

测量大变位的一种高精度方法(英文)

本文提出一种利用ＣＣＤ位置探测系统测量物体的位移或变形的新方法．目标点固定在被测物体上,成像于ＣＣＤ摄像头,输出电信号．ＡＤ转换器将模拟电信号转换为数字信号,并送至计算机．采用数字图象处理技术进行分析并计算测点的位置变化．在距离被测物体６ｍ时,测量精度可达００１ｍｍ．     

一种提升圆锥算法机动性能的方法(英文)

为提高捷联惯导姿态圆锥算法的机动性能,提出一种新的圆锥补偿结构,该结构通过在传统结构中增加一个子样获得.在给出经典圆锥运动定义的基础上,推导了基于新的圆锥补偿结构的圆锥补偿残余误差通式,并采用频率泰勒方法设计了新的圆锥补偿结构系数,从而获得一类新的圆锥补偿算法.定义了2种圆锥算法误差模型,分别用于圆锥环境和机动环境下的圆锥算法性能评估.仿真结果表明:新的四子样圆锥算法的机动精度比传统四子样圆锥算法的机动精度提高约1倍;与传统的压缩圆锥算法相比,新的圆锥算法在保持圆锥性能的同时具有更好的机动性能.     

培养一种积极的心态(英文)

阅读下面的文章,并按要求完成后面的阅读理解任务。You must have a positive mental attitude to make life pay off on your own terms.Nothing great has ever been achieved without PMA Recognize that your mental attitude is the only thing over which you—and only you—have complete control.Exercise that control,and direct it by using PMA.Learn to close the door of your mind on all failures from your past.Clear your mind of any in-     

一种新的轴向柱塞泵配流盘过渡区设计方法(英文)

目的:轴向柱塞泵配流盘的过渡区是影响轴向柱塞泵噪声的重要因素之一。本文提出一种新的过渡区设计方法,旨在降低轴向柱塞泵的噪声。创新点:1.该方法设计的过渡区结构,使得柱塞腔与配流盘腰形槽之间的通流面积完全匹配柱塞腔预升压与预降压所需求的面积;2.优化倒灌流量在倒灌区间内的分配。方法:1.计算柱塞腔预升压与预降压所需求的柱塞腔与配流盘腰形槽之间的通流面积;2.将柱塞腔倒灌流量平均分配到倒灌区间内,从而降低倒灌流量的峰值。结论:1.该设计显著地降低了柱塞腔压力的正超调量和负超调量;2.减小了轴向柱塞泵出口流量脉动的幅值。     

用于CORDIC算法的一种新的模校正方法(英文)

提出一种新的纠正CORDIC算法中模因子的方法以解决传统方法所带来的电路结构不规则、系统吞吐率降低等弊端.首先根据迭代方程之间的关系,通过推导引入一个新的迭代方程,将模因子的校正过程转化为只需要移位和加法运算即可实现的简单的迭代过程.然后分析了该算法量化误差中的舍入误差所带来的影响,并提出该误差可以通过对迭代方程中的系数进行合适取值来降低.最后对提出的算法通过Matlab建模并利用Verilog HDL语言进行RTL级编程,经过综合后在FPGA上进行了验证.仿真结果表明,与传统方法相比,在相同精度条件下使用所提方法只需要额外的一个时钟周期即可达到模校正的目的,且不需要修改基本的迭代操作.因此电路实现比较规则,同时系统吞吐率变化较小.     

一种防止缓冲区溢出的整数溢出检测方法(英文)

为了防止由整数溢出引起的缓冲区溢出,提出了一种简化的基于路径松弛的整数溢出检测方法.表示动态分配缓冲区大小的整型变量发生溢出,极有可能引发缓冲区溢出.该检测方法基于这一发现,在动态测试之前先进行轻量级的静态分析,跟踪与动态分配缓冲区大小相关的关键变量,保存追踪的关键变量在不同地方的取值上限和下限,并将维护信息插入源代码中.测试时通过路径松弛,在执行路径上不仅考虑追踪变量的当前测试用例值,判断程序是否出现整数溢出,还根据插入的维护信息进一步考虑追踪变量可能的取值范围,判断程序是否有可能出现整数溢出.实例研究验证了该方法的有效性,并且与同类方法相比,减少了检测量,提高了检测效率.     

建立高等学校科学的量化评估体系的一种方案

构建高等学校科学的量化评估体系是非常必要的。本阐述了构建高等学校量化评估体系应遵循的基本原则并提出了我们的一种方案。在方案中着重强调了培养人才能力、科研水平、办学条件在该评估体系中的地位、作用和意义。     

产品全生命周期设计及其应用

给出了产品全生命周期设计的定义，阐述了全生命周期设计的内容和方法，探讨了实现全生命周期设计的关键技术，并开发了基于SolidWorks的面向装配的设计工具(DFA)。     

Children's participatory design for sustainable development and community planning

The urban developments have been carried out by only professionals for a long time because of efficiency and safety.However,most residents are ordinary people.Therefore,it is necessary to change the aw...     

Education for sustainable development in early childhood education: a review of the research literature

The aim of the study is to describe and analyse research articles relating to the subject of education for sustainable development (ESD) for early childhood education (ECE), published during the years 1996–2013. This is done by answering three specific questions: (1) How is ESD defined by researchers in ECE? (2) What are the major research inquiries and results? (3) What does the research say about young children acting for change in relation to sustainability? Our analysis identified two different definitions of ESD: first, as a threefold approach to education based on questions concerning education about, in and for the environment; and, second, as an approach to education that includes three interrelated dimensions: economic, social and environmental. Two major research areas are identified in this study. The first area relates to how teachers understand ESD, while the second area focuses on how ESD can be implemented in educational practice. During the period studied, the research has evolved from teaching children facts about the environment and sustainability issues to educating children to act for change. This new approach reveals a more competent child who can think for him- or herself and make well-considered decisions. The decisions are made by investigating and participating in critical discussions about alternative ways of acting for change.     

关于“旅游产品生命周期论”的几点讨论

本文就目前理论界争论激烈的“旅游产品生命周期论”的几个关键问题进行讨论,通过部分重要概念的认定,得出了旅游产品生命周期中的两个类型——周期与准周期,有效地释疑于“旅游产品生命周期论”的质疑者.     

A sustainable model for OpenCourseWare development

The purposes of this study were to (a) determine the cost of converting BYU Independent Study’s e-learning courses into OpenCourseWare, (b) assess the impact of opening those courses on paid enrollment in the credit-bearing versions of the courses, and (c) use these data to judge whether or not an OpenCourseWare program could be financially self-sustaining over the long-term without grant monies or other subsidies. The findings strongly suggest that the BYU Independent Study model of publishing OpenCourseWare is financially self-sustaining, allowing the institution to provide a significant public good while generating new revenue and meeting its ongoing financial obligations.     

因特网在新产品开发中的应用:一个概念模型

网络时代的一个显著特征是技术日新月异,产品的生命周期缩短,因此,不断利用新技术开发新产品,是企业在竞争中不败的法宝。本文基于Montoya-Wiess和Calantone对新产品开发影响因素的研究框架,分公司战略、新产品开发过程、市场环境和组织环境四个维度,分析了因特网在企业新产品开发中的作用。     

The International Education Index: A global approach to education policy analysis,performance and sustainable development

Before the COVID-19 pandemic, the world struggled to address growing educational inequalities and fulfil the commitment to Sustainable Development Goal 4, which seeks to ensure inclusive and equitable quality education and promote lifelong learning opportunities for all. The pandemic has exacerbated these inequalities and changed how education functions, moving to online and hybrid methods. The challenges in global education highlighted and worsened by the pandemic make it necessary to re-evaluate education systems and the policies in place to support access, quality and equal opportunity. This article focuses on analysing education policies at a national level. It tests a pilot policy analysis tool, the International Education Index (IEI), developed as a starting point to begin this reconsideration and create an accessible and comprehensive way to evaluate national education systems to inform decision-making and policies in the new context. This research uses Ireland and Northern Ireland to test the IEI pilot tool. The IEI consists of 54 questions across nine indicators, including institutional frameworks, education strategies, digital skills and infrastructure, twenty-first century skills, access to basic social services, adherence to international standards, legal frameworks, data gathering and availability and international partnerships. Countries can score 108 points to be categorised as having developed, emerging or nascent national education systems. Ireland scored 94 and Northern Ireland 81, indicating that they have developed national education systems.     

关于扭曲交叉积的一个注记

考虑扭曲交叉积与内作用的关系,这一结果推广了Blatter-Cohen-Montgomery在文献[1]中的重要结论.     

我国农业旅游产品深度开发刍议

以黑龙江省农业旅游产品开发为例,总结了我国农业旅游产品开发中存在的产品结构单一、缺乏文化底蕴、参与性与体验性不足等问题。通过理论与实践相结合以及对比分析的方法,在借鉴国外农业旅游产品开发经验的基础上,提出依托丰富的农业旅游资源和深厚的农耕文化以及民族文化,深度开发多元化、特色化、文化性强、体验元素丰富的高品质农业旅游产品,科学推进我国农业旅游的可持续发展。     

基于软件开发产品线的校企合作模式研究

飞速发展的软件产业对软件开发人才的培养提出了新的要求。本文提出的以软件开发产品线为依托的校企合作模式,立足产品开发,建立校企合作的共赢点,保证了教学过程和软件开发过程的一致性、形成了实训项目和软件产品统一、使科研成果和产业应用对接,实现了校企的深度融合。经过与多家软件开发企业的合作实践检验,充分验证了该模式的有效性和可持续性。