共查询到20条相似文献，搜索用时 109 毫秒
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目的：讨论在可视化图形界面程序设计过程中有关控侍的方法的类的应用,解决业内人士在类设计方面的疑惑。方法：利用Visual Basic程序设计方法,给出方法的类的应用基本概念和基本方法和可行的程序。结果：通过恰当的程序分析得出正确的方法的类设计方法和规则。结论：控件的方法的类的设计必须考虑其应用的透明性和修改的封装性。 相似文献
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一个信息系统开发的成败与采用的开发方法有直接的关系。已有多种开发方法,新的方法仍在产生。目前常见的几种方法体系有:结构化分析方法、原型法、面向对象法和CASE方法。但对一具体信息系统来说,不是所有方法都适合该系统的开发。对这些方法进行分析,探讨这些方法的优缺点。 相似文献
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Delphi方法作为一种新的预测方法,近年来受到了各个领域的重视,并逐步地引用到了教育技术学研究的领域。本文首先对Delphi方法的定义、特点、应用及其应用的过程模式进行了阐述,其次分析了Delphi方法在教育技术学研究中的应用领域和应用步骤;最后对Delphi方法在教育技术学研究中的应用作了展望。在教育技术学研究中引入Delphi方法是非常必要的,Delphi方法将会成为教育技术研究方法中的又一种高效的方法。 相似文献
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黄欣荣 《科学．经济．社会》2010,28(3):90-94
复杂性方法是随着复杂性研究兴起而诞生的新兴科学研究方法,主要由涌现生成方法、主体适应方法、进化计算方法、边缘临界方法和复杂网络方法等五种主要的方法构成。这些方法能够比较成功地解释复杂组织从兴起、维生、发展等组织演化的各个阶段,是科学研究方法的新发展,并由此丰富了科学方法的理论宝库。 相似文献
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[目的/意义]基于科技文献构建问题—方法矩阵,探索科技文献研究内容新颖性评估方法,辅助科技查新应用。[方法/过程]对科技文献内容进行信息抽取,提取研究问题和方法内容文本并构建问题—方法矩阵。利用LDA模型对科技文献采用的问题与方法进行分类,将科技文献在问题—方法矩阵中定位并可视化。通过设定阈值划分区域,确定待评估科技文献研究问题和方法所在区域,进行新颖性评估分析,并通过实验验证该方法的有效性。[结果/结论]提出的基于问题—方法矩阵的文献新颖性评估方法通过可视化方式不仅有利于辅助科技查新判断,还可服务于创新选题。[局限]基于科技文献的研究问题与方法信息抽取和新颖性评估计算的自动化方法有待进一步研究。 相似文献
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我国专利法第11条规定了产品和方法专利权的效力,但对于方法专利的使用行为和使用者未作出明确的定义。广东高院第326号民事判决书涉及对方法专利使用者的认定,对此各界存有争议。本文通过阐述方法专利的三种形式以及使用这三种形式方法专利的内涵,认为涉案的控制空调器运行的方法属于一种作业方法是合理的,该类作业方法的使用者通常为一般消费者,非空调器的制造者。 相似文献
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数学建模中预测方法是重要的方法之一。而预测方法多种多样,涉及的课程相当广泛,理论也相当繁琐,学生难以形成系统的认识和掌握具体的方法。提出了把几种预测方法归纳到一起,由实例到方法再到比较,删减不必要的理论,从而使学生更容易领会并能应用预测的几种方法。 相似文献
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一种集成的科技实力综合评价方法 总被引：6，自引：0，他引：6
国内外对有关科技实力评价多基于指标体系法的计算进行,且常用单一方法,这类方法按照权重赋值方法的不同,可分为主观赋权法和客观赋权法。本文从目前各种评价方法中选择和引入了主观赋权法和客观赋权法中的3种适宜方法:线性加权法、主成分分析(因子分析)法和标准化法,给出了适应于每种方法的计算方法,分析了每种方法优势和不足之处。尽管每种评价方法适合于科技实力评价,仅采用一种方法进行科技实力综合评价,其结果无疑具有一定的片面性。因此,本文在此基础上提出了融合主观赋权法和客观赋权法优势的集成方法,从而使评价结果更为合理,此方法也适合应用于各种综合评价类型中。 相似文献
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理想化思维方法是思维方法中的重要成员之一,是思维主体把逻辑思维方法和非逻辑思维方法结合起来的思维方法。本文首先概述了理想化思维方法,分析了其三个特性,最后详细介绍了理想化思维方法在科学探兖中的重要作用。 相似文献
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Sheng Yan Jun Zhang Huaying Chen Gursel Alici Haiping Du Yonggang Zhu Weihua Li 《Biomicrofluidics》2014,8(6)
Microfluidic diagnostic devices often require handling particles or cells with different sizes. In this investigation, a tunable hydrophoretic device was developed which consists of a polydimethylsiloxane (PDMS) slab with hydrophoretic channel, a PDMS diaphragm with pressure channel, and a glass slide. The height of the hydrophoretic channel can be tuned simply and reliably by deforming the elastomeric diaphragm with pressure applied on the pressure channel. This operation allows the device to have a large operating range where different particles and complex biological samples can be processed. The focusing performance of this device was tested using blood cells that varied in shape and size. The hydrophoretic channel had a large cross section which enabled a throughput capability for cell focusing of ∼15 000 cells s−1, which was more than the conventional hydrophoretic focusing and dielectrophoresis (DEP)-active hydrophoretic methods. This tunable hydrophoretic focuser can potentially be integrated into advanced lab-on-a-chip bioanalysis devices. 相似文献
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Ohid Yaqub 《Research Policy》2018,47(1):169-179
Serendipity, the notion of researchers making unexpected and beneficial discoveries, has played an important role in debates about the feasibility and desirability of targeting public R&D investments. The purpose of this paper is to show that serendipity can come in different forms and come about in a variety of ways. The archives of Robert K Merton, who introduced the term to the social sciences, were used as a starting point for gathering literature and examples. I identify four types of serendipity (Walpolian, Mertonian, Bushian, Stephanian) together with four mechanisms of serendipity (Theory-led, Observer-led, Error-borne, Network-emergent). I also discuss implications of the different types and mechanisms for theory and policy. 相似文献
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软件开发是一种创造性很强的活动,由于项目的一次性和独特性的特点,因此在软件项目实施完后,很多在项目实施过程中积累起来的知识经验就会随着项目的结束而消失,从而忽略了让开发小组从历史项目中学习和总结经验的机会。本文对项目后评价的定义以及实施意义进行了描述,并对两种不同的项目后评价方法作出了比较分析,最后以某高校学生选课系统项目为例,阐述了如何实施项目后评价工作,并为该项目的日后改进提出了意见和建议。 相似文献
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This paper presents a new methodology for valuing new drug applications (NDA) and the R&D of pharmaceutical companies based on real option models. Traditional valuation models fail to capture the full value created by R&D to pharmaceutical companies, because they do not correctly model the nature of the process of developing a new drug. It is a series of consecutive phases from R&D to commercialisation, where each phase is in fact an option on executing the following phase, i.e. a compound option. For a NDA, the R&D phase can best be presented as a 6-fold compound option on the commercialisation phase. Using a generalisation of Geske’s compound option model, we derive a closed-form solution for a n-fold compound option model, and apply it to calculate the value of a NDA using sector average figures. 相似文献
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Recently, series elasticity has been realized using pneumatics in human-robot interaction systems. Pneumatic circuits provide not only a flexible power transmission, but also the elastic element in a series elastic actuator (SEA). Pneumatic series elastic systems involve more than twice the number of parameters that influence system behaviors in comparison with rigid robotic systems. In this study, a position controller that eliminates the need of identifying a system model by employing the time delay estimation (TDE) technique is proposed for pneumatic SEA systems. The TDE technique is effective in compensating for system dynamics and all uncertainties involved in system behaviors without imposing computation load. TDE error is cancelled out through a learning way, which improves control performance and leads to asymptotic stability. A simulation study demonstrates the robustness of the proposed controllers against uncertainties imposed on the motor system as well as uncertainties on the end-effector. The simulation shows the efficacy of the learning compensation for TDE error. 相似文献
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This paper is a study of the bending-torsional flutter of a cantilevered wing subjected to a follower force, and containing a lumped mass, at the free end. In addition, a distributed aerodynamic loading is introduced along the wing. This results in a set of nonself-adjoint differential equations with variable, complex coefficients whose solutions are obtainable only in series form. Using the Frobenius method, a direct procedure is employed which retains the exact expression of the Theodorsen function and the unknown coefficients are evaluated on a computer which numerically converge to any prescribed accuracy. It is found that, as a result of the interaction of the two sources of non-conservative loadings, the follower force reduces considerably the critical speed of flows in all cases studied. An increase in the tip mass, however, has a stabilizing influence. The effect of structural damping is also examined and it is shown that internal damping forces may have pronounced influences on the flutter speed of the system. 相似文献
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Keith N. Hampton 《The Information Society》2003,19(5):417-428
Critics have argued that information and communication technologies (ICTs) disconnect people from their social networks and reduce public participation. Research in support of this perspective has been biased by two assumptions. The first is a tendency to privilege the Internet as a social system removed from the other ways people communicate. The second is a tendency to favor broadly supportive strong social ties. Survey and ethnographic observations from Netville, a 2-year community networking experiment, suggest that weak, not strong ties experience growth as a result of ICTs. By examining a unique and underexplored stage in the life cycle of a community networking project, the end of a networking trial, this article demonstrates how ICTs facilitate community participation and collective action (a) by creating large, dense networks of relatively weak social ties and (b) through the use of ICTs as an organizing tool. 相似文献
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Creating knowledge within a team for developing new products and services is considered a primary means for improving organizational performance. Drawing upon the socio-technical perspective, we investigate the blended effects of social (learning culture, teamwork quality, and knowledge complexity) and technical (IT support) factors on team-level knowledge creation and team performance. We propose a model that features synergetic interactions between social and technical factors in this knowledge creation process. The model was tested by utilizing data from a field survey of industry managers. The results show significant interactions between social and technical factors, which influence team-level knowledge creation and, in turn, team performance. Our findings can be used to develop socio-technical initiatives to enhance the process of creating team-level knowledge within firms. 相似文献
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The effect of an imperfectly bonded laminar composite is examined in terms of the intensification of the torsional stresses operative near the imperfection which is assumed to be a circular shaped area. The laminar composite is modelled by four layers of different materials with the two outer layers being infinite in height and debonding occurs at the interface of the two inner layers. The analysis based on the application of Hankel transforms and the solution of a pair of dual integral equations can be easily extended to a multilayered system. Depending on the size of the layer thickness relative to the radius of the debonded area, delamination may take place either in a stable or unstable fashion. The analytical results also indicate that the influence of lamination tends to lower the stress intensity around an interface imperfection as compared to the stress state in a homogeneous solid containing the same imperfection. Numerical results are obtained for two special laminate geometries and discussed with reference to the pertinent parameters used in the current theory of fracture mechanics. 相似文献
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Christos V. Massalas George I. Tzivanidis John T. Katsikadelis 《Journal of The Franklin Institute》1978,306(6):449-455
In this paper, a solution is presented to the buckling problem of a continuous beam resting on a tensionless foundation model that was proposed by Winkler and by Reissner. 相似文献