安防通信工程对智能化小区建设的价值研究

随着科学技术和通信技术的发展,人们不再满足于传统简单的居住条件和居住功能,开始追求更重视人性化需求的高级住宅,智能化小区从而走进我们的生活.安全性作为智能化小区的首要目标,本文通过对安防通信系统的设置原则、安防通信系统的构成与应用的分析,表明了安防通信工程如何在智能化小区建设中发挥它的巨大价值.     

What is a multinational corporation? Classifying the degree of firm-level multinationality

The degree of firm-level multinationality is a key dimension that spans all theoretical frameworks, levels of empirical analysis and domains of investigation in international business research. There is, however, no agreed approach to defining or measuring firm-level multinationality. This is reflected in inconsistent approaches to sample selection and empirical testing, and it has curtailed the advancement of the discipline. We propose that instead of searching for the elusive, all-encompassing definition of an MNC, international business scholars should instead agree on a classification system for the degree of firm-level multinationality. We illustrate the advantages of this approach by constructing a simple classification system that takes into account the firm's breadth and depth of multinational engagements. We illustrate our matrix of firm multinationality by classifying a novel sample of over 1000 firms from seven countries, and we demonstrate how it can guide theory development and empirical testing. We also provide examples of potential future research directions.     

我国经济增长结构调整的自然观思考

经济系统与自然系统存在关联性,两者都遵循了＂平衡——不平衡——平衡＂螺旋上升的发展轨迹,因此经济系统模拟自然系统具有一定的可能性。消费拉动不足一直是中国经济增长结构存在的主要问题,应运用自然辩证法的原理进行经济结构调整,要均衡增加消费、出口、投资、国家投入,同时注重整个金融市场体系的系统优化和均衡发展。     

点光源追踪系统设计

旨在设计一个模拟强点光源追踪装置,以提高光源的利用率。装置由模拟强光源和光源追踪2部分构成。模拟强光源装置采用TI公司的LM317组成可调恒流源装置控制1W高亮度LED光源,并且使用电阻分流和MSP430f147内部ADC采样数显。追踪装置采用ATmel公司的ATmega16高性能AVR单片机作为主控芯片,将采集到的信号进行综合判别和处理,然后控制舵机实现对光源的跟踪,并可实现手动校准。     

论PLC技术在工业控制系统中的应用

可编程控制器简称———PLC是以微处理器为基础,综合了计算机技术、自动控制技术和通讯技术发展而来的一种新型工业控制装置,在工业自动控制系统中发挥着越来越重要的作用。我们可以通过PLC系统结构和原理以及编程语言的介绍来认识PLC。     

再生式通信卫星转发器的研究进展

随着星上高速数据处理与交换的需求不断增加,再生式通信卫星转发器逐渐成为研究 热点。概述了几种典型的再生式转发器国内外最新研究进展,指出了其信息处理、交换技术 发 展中存在的主要问题,包括多载波解调、吞吐量较低以及微波/光调制等,在此基础上提出 了合适的补偿技术、星上半透明突发交换、光副载波调制以及波分复用等针对性的解决方法 ,可为我国卫星转发器设计以及星上信息处理、交换等关键技术研究提供参考。     

基于WSR基础设施系统管理研究

基础设施系统是经济社会生态持续发展的基础条件,其宏观管理是一项复杂的系统工程。文章分析了基础设施系统及其管理特性,应用物理-事理-人理（WSR）系统方法,研究构建基础设施系统管理WSR模式,并以上海市基础设施项目为例对其进行了WSR系统分析、系统实施和系统评价等研究。基础设施WSR系统管理模式研究可为基础设施管理提供理论基础和指导原则。     

Can farmers extend their cultivation areas in urban agriculture? A contribution from agronomic analysis of market gardening systems around Mahajanga (Madagascar)

The rapid urbanization in developing countries implies an increasing pressure on urban agriculture for production. As most perishable food products come from this agriculture in close proximity to population concentrations, we analysed from an agronomic point of view how market-garden farmers can meet this increasing urban demand. This work took place in the case of Mahajanga, a secondary city with high increasing demographic rate on the Northwest coast of Madagascar. Based on preliminary surveys to characterize the farming systems (on a sample of 91 farms), 11 market-garden farmers chosen in the three main agricultural zones of the urban area were surveyed during two years. Surveys aimed at understanding their decision rules in crop choices, crop allocation to land and resource management, and to estimate their room for manoeuvre to increase their leafy vegetable areas under cultivation. The wholesalers and retailers who buy the farmers’ produce were also surveyed. A previous model of decision rules regarding crop location on farm territory was used to analyse the on-farm surveys and cartographic methods (GIS and on-farm manual representations) were used to quantify the land use. We highlight the following major points. (1) The leafy vegetable production in the surveyed farms already intensively uses land: farmers have complex decision rules largely depending on the water dynamics in the two main environments (lowlands and lakesides) where leafy vegetables are cultivated during the dry season. (2) The scarcity of farmers’ resources (labour money and water) leads to very little internal room for manoeuvre to increase the leafy vegetable production in the farms. (3) At territorial level however, some land reserve exist in one of the lowlands, but not on lakesides. The water availability for agriculture must be better informed through specialized hydrologic studies, as one of the main constraints nowadays to extend the agricultural area. An extrapolation to other cases of urban agriculture is then discussed as well as the role of agronomy to help urban planners to consider the place of agriculture in the urban development.     

高绩效工作系统能否抑制员工沉默?

在自我决定理论的基础上探讨高绩效工作系统对不同动机员工沉默行为的影响机制及差异性。研究结果表明：（1）高绩效工作系统对员工默许沉默、防御沉默和漠视沉默行为具有显著的抑制作用;（2）高绩效工作系统能通过自主需求满意度、能力需求满意度和关系需求满意度的提升降低员工的默许沉默行为;（3）高绩效工作系统能通过关系需求满意度的提升降低员工的防御沉默行为;（4）高绩效工作系统通过自主需求满意度、能力需求满意度和关系需求满意度的提升降低员工的漠视沉默行为。     

基于ADS-B报文的“北斗”便携式终端实现

针对单个广播式自动相关监视（Automatic Dependent Surveillance-Broadcast,ADS-B）发射机传输距离受限、多地面站组网复杂以及成本较高等问题,在分析ADS-B报文编码与解码算法的基础上,探讨了基于无线网络传输的ADS-B报文信息技术,并设计了基于“北斗”卫星导航（BeiDou Satellite Navigation System,BDS）/嵌入式控制器以及无线网络的便携式监视终端系统。利用实测ADS-B数据联合搭建的监视中心对算法和系统进行测试,结果表明数据传输稳定,实现了低空空域通用航空飞机ADS-B态势信息的网络传输功能,丰富了监视信息的链路传输方式,为低空通航飞行器安全飞行和全面监视提供了新的方法。