基于android和云平台的智能家居系统设计与实现

为解决智能家居系统大规模数据的存储、管理及移动终端的可靠接入等问题,本文设计了一种基于嵌入式家庭网关、Android和云平台服务的智能家居系统。利用极光云推送服务及时将家庭的异常报警信息推送到手机客户端,系统还提供了视频监控功能,用户随时随地通过手机查看家庭动态。当监测异常时会自动拍照记录异常场景,并上传至yeelink物联网云平台,进行图像云存储。另外通过手机客户端可以查看所选时间范围内的报警图像,随时掌控家庭生活。     

First- and second-price sealed-bid auctions applied to push and pull supply contracts

We investigate a newsvendor-type retailer sourcing problem under demand uncertainty who has the option to source from multiple suppliers. The suppliers’ manufacturing costs are private information. A widely used mechanism to find the least costly supplier under asymmetric information is to use a sealed-bid reverse auction. We compare the combinations of different simple auction formats (first- and second-price) and risk sharing supply contracts (push and pull) under full contract compliance, both for risk-neutral and risk-averse retailer and suppliers. We show the superiority of a first-price push auction for a risk-neutral retailer. However, only the pull contracts lead to supply chain coordination. If the retailer is sufficiently risk-averse, the pull is preferred over the push contract. If suppliers are risk-averse, the first-price push auction remains the choice for the retailer. Numerical examples illustrate the allocation of benefits between the retailer and the (winning) supplier for different number of bidders, demand uncertainty, cost uncertainty, and degree of risk-aversion.     

WAPP2.0 PUSH技术在无线网络中的应用

WAP（无线应用协议）是一个开放的工业标准，代表了未来网络中移动通信网和因特网相结合的发展方向。本文分析了其最新版本WAP2.0协议的新特性及其“推”（PUSH）技术构架，并探讨了它在无线网络中的应用实现。     

AB类功率放大器输出级的计算机仿真

根据AB类功率放大基本电路,结合SABER软件仿真分析了交越失真产生原因、不同负载的失真以及同时说明了如何用仿真进行改善电路设计,给出了调节静态工作点和消除交越失真的方法。     

基于Android的简易即时通信系统设计与实现

该文介绍了一种基于云技术实现Android设备之间文字、语音即时通信的解决方案。该系统无需搭建服务器,利用免费的公共云存储平台以及推送平台实现主要功能,具有简单易行、稳定可靠、可扩展性强等特点。该系统避开了移动运营商的短信和语音电话平台,为小范围人群通信提供了一种实时、廉价的通信方式。     

高性能硅橡胶按键的制造

本文介绍一种高性能硅橡胶按键的制造方法和质量控制参数，详细叙述绝缘胶料和导电胶料的配方及性能，研制的硅橡胶按键经３２万次寿命试验，产品仍然完好；标准接触电阻小于１００Ω；绝缘电阻值大于１×１０＾１６Ω－ｃｍ；手感优异，反弹性良好，符合硅橡胶按键的要求。     

WAP2.0及其Push技术应用

WAP（无线应用协议）是一个开放的工业标准，代表了未来网络中移动通信网和因特网相结合的发展方向。本文分析了其最新版本WAP2.0协议的新特性及其“推”（PUSH）技术构架。并探讨了它在无线网络中的应用实现。     

支持移动多媒体通信中间件的WAP网关

WAP协议是WAP论坛提出的一个开放通信协议;WAP网关进行协议的转换,是移动终端无线接入Internet的枢纽。在简要介绍了无线应用协议后,提出了一个在Linux操作系统平台下运行的WAP网关(数据通信网关)的设计与实现方案,该WAP网关由承载层模块、WAP模块和SMS模块组成,其中详细介绍承载层模块和WAP模块的工作原理,并在实验室环境下对网关进行测试,给出了测试结果。     

移动推送技术面面观

随着移动互联网的快速发展,推送技术得到越来越多的关注和应用。文章详细比较了各种主流的推送技术和平台,阐述了各自的技术特点,分析了适合的业务种类、应用场景;最后,针对现网应用特点提出了一种推送方案的改进设想。     

Modeling mixed push and pull promotion flows in Manpower Planning

Manpower Planning is a useful tool for human resource management in large organizations. Classical Manpower Planning models are analytical time-discrete push and pull models. Push models are characterized by the same promotion and wastage probabilities for people within the same group. This assumption is suitable in organizations where for instance promotions are used for reasons of personnel motivation or employees are promoted after succeeding in an exam. In many organizations, people are only promoted when there are vacancies at other levels. In those cases, pull models can be used. Pull models only assume known wastage probabilities. In practice, both assumptions may occur simultaneously. In this paper, a mixed push-pull model is developed for organizations in which both types of flows are considered.