用脉冲声能衰变与脉冲反向积分法求混响时间之比较

为简化使用脉冲响应平方反向积分求混响时间,有人提出直接使用脉冲声能衰变率求混响时间的方法。文中对直接使用脉冲声能衰变与使用反向积分法进行了比较,讨论了直接使用脉冲声能衰变求混响时间的不稳定性,探讨了使用反向积分法更为精确的原因。     

元器件使用说明书的质量保证作用

从使用原因产生的质量问题入手,分析了使用质量问题与产品使用说明书的关联性;并以典型事例为牵引,剖析了产品使用说明书的相关问题及原因,揭示出元器件承制单位对保证产品使用可靠性应承担的职责;并提出确保产品使用说明书充分发挥功效的四大措施,以使各元器件承制单位充分重视使用说明书的编制与作用.     

中央电视台奥运采访新介质ENG应用回顾

中央电视台北京奥运会负责采访报道的前期摄录一体机全部采用了非磁带的高清新介质设备,本文总结了相关设备的使用情况,对新设备在奥运期间实际使用的特点,使用流程以及使用中的反馈进行了汇总和说明。     

交换机在工业以太网中的应用探讨

对于工业现场以太网使用方面产生的问题进行了一定的分析,并且探讨了工业以太网中交换机的使用情况,总结了工业现场使用交换机的注意事项。     

C语言指针探究

就C语言中指针的概念、使用和指针的优点及使用指针中困惑的主要问题,做了详细的陈述,包括指针是什么,如何使用指针,使用指针能干什么,什么时候使用指针等,并结合实例解释上述问题。最后对指针做了简单总结。     

冷却塔介绍及选型

介绍了冷却塔的分类和组成,影响冷却塔选型的主要技术参数。比较了常用冷却塔优缺点及使用条件。进行了冷却塔选型曲线使用示例介绍,并总结了冷却塔使用注意事项。     

基于数据挖掘的装备使用质量信息管理系统

以装备使用质量信息为研究对象,界定了装备使用质量信息的范围,在装备使用质量信息分析的基础上,结合数据挖掘技术的特点,阐述数据挖掘在装备使用质量信息管理系统的应用,并重点给出其可以解决的装备质量问题,最后提出装备使用质量信息管理系统的组成与相应功能,为提高装备使用质量信息利用效率打下了基础.     

如何选择和使用红外测温仪

本文简要讲述了三种类型红外测温仪的设计原理,对比了它们各自的优缺点,介绍了它们的使用范围及使用方法,为如何选择使用红外测温仪提供参考。     

中间件系统及其在武汉移动营业帐务系统中的应用

在叙述了中间件的三层结构概念的基础上,介绍了武汉营业账务系统中所使用的BEA公司的TUXEDO中间件及其使用情况和使用后的效果。     

有线电视网络管理的策略应用

介绍了有线电视网络管理系统的概念及有线电视网络管理系统的基本功能.阐述了使用策略进行网络管理的必要性,论证了使用策略进行网络管理的可行性,介绍了使用策略实现网络管理的基本实现方案.     

作战中舰载雷达干扰装备的作战使用时机

作战使用时机决策是舰载有源、无源干扰使用的基本前提。结合相关电子对抗战术理论，通过建模分析，得出了有源压制式干扰和欺骗式干扰、无源冲淡式干扰和迷惑干扰的使用时机，探讨了伪装雷达幕的作战使用。其结论对有、无源干扰装备的作战使用决策具有重要的指导意义。     

Exploring the relations of subjective and objective Instagram use on young adults' mental health

We collected objective digital trace Instagram use data and subjective self-report use data to investigate relations with self-reported self-esteem, loneliness, body satisfaction, and depression among 192 young adults (ages 18–25). To our knowledge, this work is among the first of its kind to include both self-report data and digital trace data to understand similarities and differences in how each relates to aspects of users’ mental health. We measured and coded for both active and passive social media use. For objective passive Instagram use, results showed a negative relationship with loneliness and depression, and a positive relationship with body satisfaction and self-esteem. Subjective passive use, however, was related positively to depression. Subjective active use was also positively related to depression. We discuss the implications of these findings, given the observed differences in the relationships as a function of the type of Instagram use measurement.     

Conceptualizing the impact of information and communication technology on individual time and energy use

The energy requirements of everyday activities such as housework, travel or sleep differ considerably; hence, individual time use – the pattern of activities individuals perform during a day – is crucial for the energy consumption associated with lifestyles. Increasing use of information and communication technology (ICT) in everyday life changes individual time use and thus affects the associated energy requirements. ICT can have increasing or decreasing effects on energy use (e.g. it can reduce transport through virtual mobility or increase transport by creating the desire to travel to places seen on the Internet). Understanding the causal relationships between ICT, time, and energy use is essential to promote its desired impacts and prevent socially and environmentally unfavorable (unsustainable) ones. Despite various approaches to time use across disciplines, no consistent conceptual framework of the impact of ICT on time use and environmental impact exists so far. In this paper, we review existing literature on (1) ICT impacts on time use, and (2) environmental impacts of time use. Aiming to bridge differences across disciplines and methodological approaches, we develop a conceptual framework for systematically assessing the impact of ICT on time and energy use. The core of this framework is the categorization of ICT impacts on the relaxation of time and space constraints to activities, parallelization, fragmentation, substitution, avoidance, and delegation of activities, changes to the duration and manner of activities, changes to the process of activity planning, and generation of new ICT-based activities. In a broader systems perspective, these effects also trigger causal chains which can form feedback loops and thus change time-use patterns with some delay (systemic effects). Changes in time use affect direct energy requirements through the energy used to perform activities (e.g. in the form of electricity or fuels). Indirect energy requirements, the energy embedded in goods, only change if production of goods can be avoided (e.g. if telecommuting leads to fewer cars being purchased). The net energy impact of a given ICT use case depends on direct and indirect energy requirements of the activities performed before and after adoption of the use case. We demonstrate the application of the framework by qualitatively assessing time and energy use impacts of a frequently discussed ICT use case: telecommuting.     

敏捷开发过程中的迭代策略分析

该文基于统一建模语言(UML)用例模型在描述系统的功能方面的特点结合敏捷开发过程中的迭代顺序,提出了以UML用例图中所包含的各个用例的风险和价值组合进行高低排序,从而决定敏捷开发的迭代顺序.这样做的一个明显好处就是能保证对高风险高价值的用例优先开发,使其在随后的各次迭代中都得到测试,从而提高该用例的可靠性,进而提高整个系统的可靠性.     

一种多进程系统用例模型的逆向生成方法

用例模型是展现程序系统级行为的有效手段.文章针对具有并发特征的面向对象软件系统提出了一种多进程系统用例模型的逆向生成方法.该方法以进程为单位对目标系统的动态信息进行组织,使用单进程系统用例模型的逆向生成方法抽取出每个进程相应的用例模型,然后对具有相同进程名的不同进程的用例模型进行叠加,从而实现了多进程系统的用例模型的逆向生成.通过实验研究,表明该方法在恢复多进程系统的用例模型方面是有效的.     

Do educational inequalities affect Internet use? An analysis for developed and developing countries

This study investigates whether the existence of educational inequalities at the country level affects Internet use. Additionally, we explore the extent to which these impacts depend on countries’ economic development levels. We use a logit model and data set of 69 high- and middle-income countries for the period 2005–2015. We find a negative relationship between Internet use and education inequality for the whole sample. The results confirm that, in addition to the level of education and other socioeconomic variables, the distribution of formal education among citizens within a country is also important to explain Internet use. We also obtain that this distribution affects Internet use to a higher extent in middle-income economies in comparison with high-income ones. Unlike the positive influence of educational levels obtained in the academic literature, the existence of within-country educational disparities negatively influences Internet use. This study demonstrates the influence of countries’ educational structure in relative terms in explaining Internet use.     

Understanding the impacts of Internet use on senior Citizens’ social participation in China: Evidence from longitudinal panel data

Scholars have appealed to build a digitally inclusive society to include senior citizens. However, conclusions on the impacts of Internet use on senior citizens’ social participation are divided. In order to address the above issue, this study addresses two questions: 1) how Internet use is related to senior citizens’ social participation; and 2) what the specific impacts of Internet use are on different subgroups’ social participation. We aim to understand the specific impacts of Internet use on senior citizens’ social participation meanwhile explore the reasons causing the abovementioned inconsistence in prior studies. We ran different panel regression models to address these questions based on a dataset drawn from the China Health and Retirement Longitudinal Study. Our empirical results indicate that seniors who are Internet users have higher social participation than those who do not use the Internet even after controlling out other influencing factors; however, frequent Internet use leads to less social participation among senior citizens. For senior citizens with higher cognitive functioning, both using Internet or not and the frequency of Internet use lead to more social participation. Both using Internet or not and the frequency of Internet use cause senior citizens with pensions to engage in fewer social activities. For female senior citizens, frequent Internet use leads to lower social participation. These findings suggest that government and communities should improve digital infrastructures and offer senior citizens more opportunities to access the Internet; meanwhile, local communities, social workers, and family members should direct senior citizens to use the Internet in a reasonable manner.     

Factors Influencing Strategic Use of Information Technology and Its Impact on Business Performance of SMEs

In this paper, we study the relationship between factors influencing the strategic use of IT and business performance by conducting a survey of small and medium‐size enterprises (SMEs). From the results of our survey we came to several conclusions which are presented here. First, IT investment has a significant impact on the strategic use of IT, and the strategic use of IT has a significant impact on business performance. Second, SME investment in IT and strategic use of IT are influenced by both the intensity of competition in the market environment and partnership with other organizations. Third, the support from the management group in SMEs is a core factor for IT investment and strategic use of IT. Finally, for SMEs to use IT strategically and successfully, it is necessary to combine members' participation with a flexible organizational structure and culture.     

Motivations for using the mobile phone for mass communications and entertainment

This study draws on the uses and gratifications framework to examine expanded use of a hybrid medium—the mobile phone—for mass communications and entertainment. Results of a telephone survey of 208 users show different motivations predict diverse uses of the mobile phone. Instrumental use motives drive the use of the mobile phone for news-seeking and Web-surfing. Further, the motive of pass time is significantly linked to playing video games via the mobile phone. In addition, the high-tech mobile phone enabled users to be more active: the more intensively people use mobile phones for voice calls, the more likely they will be to use mobile data services. Thus, the hybrid mobile phone bridges interpersonal and mass communication. Finally, younger users are more likely to use mobile phones for getting news and entertainment. Implications for the industry and recommendations for future research are discussed.     

一种基于Matlab的虚拟仪器仿真和应用新途径

结合虚拟仪器开发环境LabWindows／CVI 6．0，较深入地研究了如何使用Matlab库函数和外部程序接口，重点阐述了在程式编制过程中对Matlab数学库和编译生成的动态链接库的使用，以及基于Matlab C语法规则自定义函数的扩展和使用，并提出了需要注意的问题，给出了实际例子，对外部程序调用Matlab的应用具有较高的实用性和参考性。