Replacing points by compacta in neural network approximation

It is shown that cartesian product and pointwise-sum with a fixed compact set preserve various approximation-theoretic properties. Results for pointwise-sum are proved for F-spaces and so hold for any normed linear space, while the other results hold in general metric spaces. Applications are given to approximation of L_p-functions on the d-dimensional cube, 1?p<∞, by linear combinations of half-space characteristic functions; i.e., by Heaviside perceptron networks.     

基于Android的汽车管理系统的软件设计与实现

在ATMEGA32单片机、REB-3571LP GPS和SIEMENS TC35硬件平台下,设计了一套基于Android的便捷式汽车管理系统.该系统是以Android为软件开发平台进行设计和开发,主要功能模块包括汽车电压与油量检测、汽车控制、号码修改和密钥修改等.文章主要介绍手机端软件部分的设计与实现,以汽车定位、汽车控制、号码和密钥的修改等功能模块为例详细介绍了其实现过程.整个系统模块化设计,具有广阔的应用价值和市场前景.     

利用GSM短消息实现热计量表远程无线抄表系统的设计

针对居民供暖系统采用分户控制、分户计量之后带来的抄表问题,提出利用GSM短消息设计热计量表远程无线抄表系统的方案.给出了系统的总体设计思路以及具体的软硬件设计方案,通过该系统实现了热计量表的远程无线抄表.     

Attracting solutions in crowdsourcing contests: The role of knowledge distance,identity disclosure,and seeker status

We investigate in the context of crowdsourcing how seekers can increase open innovation performance, measured as received solver attention, by making two strategic decisions: selecting innovation tasks that are well suited for crowdsourcing and choosing between the potentials of status signalling through identity disclosure versus enjoying the benefits of anonymity. Drawing on uncertainty reduction theory, we suggest that a well-articulated problem statement reduces uncertainties of potential solvers and increases their willingness to participate. We argue that the ability of seekers to draft high-quality problem statements depends on the distance between the problem domain and their current knowledge stock. An analysis of 637 crowdsourcing projects finds that problem-seeker knowledge distance and received solver attention are curvilinear related such that moderate levels of knowledge distance maximize solver participation. However, high-status seekers who engage in identity-based status signalling are able to benefit from crowdsourcing across all levels of problem-seeker knowledge distance.     

协同副词“一起”与“一齐”可替换度研究

现代汉语中协同副词“一起、一齐”使用频率较高,存在可替换的现象。采用词频统计、替换比较、综合分析等方法考察,两者的可替换度存在等级差异。这些差异的形成跟它们的语源义有关。“一齐”与“一起”之间的关系既有对立的又有交叉的,并不完全是非此即彼的。从语法化的角度对两者共时平面的差异进行解释,可以廓清它们的使用规律。     

Technology adoption,consumer inattention and heuristic decision-making: Evidence from a UK district heating scheme

This paper contributes to the debate on the energy efficiency paradox according to which consumers fail to adopt cost-effective, energy efficient technologies over less efficient technologies and therefore fail to reduce energy consumption. Both traditional and behavioural theories are used to investigate the decision-making process of residential consumers with empirical evidence based upon a specially designed quasi-experimental survey of 784 households on the decision to connect to a district-heating system, a more energy efficient alternative to individual heating systems. The results suggest an internal discount rate of around 36 per cent for homeowners, a signal that consumers undervalue future energy costs. We also find the household’s decision to be negatively affected by years of payback up to around 7–8 years. Our findings suggest that neglecting consumer inattention and heuristics can lead to biases which cast doubt on the existence of the energy efficiency paradox. We believe that these results help to explain why some consumers are unlikely to invest in energy efficient technology, particularly those on low incomes.     

中国与世界优秀女子足球队进攻能力比较分析

采用录像观察统计法、数理统计法对德国、巴西、美国、挪威及中国女足的进攻技术、战术进行了初步探讨,研究表明:前四名球队射门、定位球进攻、争顶球和传中以及运球过人等能力均较中国队表现突出,其主要原因与中国队整体进攻技战术打法不合理密切相关.     

基于TC35i和89C51的无线监控系统

介绍了无线通信模块TC35i;着重阐述TC35i和89C51组成的SMS无线监控装置的软硬件实现;给出了详细硬件连接图和软件实现框图。     

E1-V.35协议转换器设计实现

E1作为我国和欧洲电信传输网一次群使用的传输标准,V.35是数字数据网中使用非常广泛的接口标准.E1一V.35接口转换器设计与实现为依托,建立了以在系统可编程逻辑器件EP1C6为核心处理器,以LXT36O,AM26SL31/32为外围辅助电路的系统模型.     

Solution of the two-dimensional heat equation for a square in terms of elliptic functions

In this study, an alternative method is presented for the solution of two-dimensional heat equation in a square region. In this method, the solution function of the problem is based on the Green function, and therefore on elliptic functions. The numerical results have been computed for an application example and compared with the results of the well-known method of separation of variables and the finite elements method. The comparison study shows that the present method gives better results than those of the other methods.