基于ZigBee与GPRS的通信网关设计

基于Zig Bee和GPRS的无线网关设计,实现Zig Bee无线传感器网络和远程通信的结合,进而将远程监控中心和现场无线传感器网络连接起来,给Zig Bee无线传感器网络提供了更为广阔的远程网络控制平台,完成Zig Bee和GPRS之间的数据透明传输和协议转换,文章提出Zig Bee和GPRS融合的硬件设计方案,利用CC2530和GTM900C芯片进行无线网关的硬件电路设计,同时设计程序实现协议的转换和数据传输。     

基于ZigBee技术和Android系统的智能家居系统的设计

从人们对智能家居的需要出发,在对智能家居控制系统进行深入研究后,该论文提出了基于Android和Zig Bee的智能家居控制系统,硬件部分以ARM和Zig Bee为主体构建网络,采用Android来开发客户端APP,用户可以通过手机客户端APP来对家居进行控制。     

基于ATmega16的室内光照智能调节系统研究

文章介绍了一种基于ATmega16单片机的室内光照智能调节系统,通过普通光敏电阻和颜色传感器共同检测环境光照参数,将当前光照强度与颜色传给Zig Beed的多支节,利用Zig Bee无线通信技术将数据传至Zig Bee的总节点,然后传至CPU,再通过CPU控制相应设备对当前光照做出智能调节。     

Zigbee技术下的智慧建筑

Zig Bee技术诞生于20世纪末,在2001年Zig Bee联盟成立,标志着这一技术开始进入标准化的进程。Zig Bee国外已有近20年的发展和研究,国内目前也在多个领域进行研究和应用,克服传统智能家居设计方案的缺点和局限性,设计了一种基于Zig Bee技术的智慧建筑局域网系统。     

头盔式煤矿井下人员无线定位跟踪系统设计与实现

基于对Blue Teeth、Wi-Fi、Zig Bee、UWB技术的分析和比较,设计了基于Zig Bee无线通信技术的头盔式煤矿井下人员定位跟踪系统。重点介绍了井下人员无线定位跟踪系统的结构、网络组成及目标节点的定位过程。该系统便于煤矿管理人员及时了解井下人员分布情况与运动轨迹。     

头盔式煤矿井下人员无线定位跟踪系统设计与实现

基于对Blue Teeth、Wi-Fi、Zig Bee、UWB技术的分析和比较,设计了基于Zig Bee无线通信技术的头盔式煤矿井下人员定位跟踪系统。重点介绍了井下人员无线定位跟踪系统的结构、网络组成及目标节点的定位过程。该系统便于煤矿管理人员及时了解井下人员分布情况与运动轨迹。     

基于ZigBee协议的智能温控报警系统设计

本文是利用Zig Bee协议的无线通信特点,设计了一款智能温控报警系统,系统的整体设计包括终端设备和协调器两部分。本文设计了系统的硬件电路,同时完成了报警系统软件部分设计,实现了对实时温度的监控和报警。该系统具有低成本、低功耗和组网灵活等优点,同时具有一定的实用价值。     

基于Cortex-A9和ZigBee的智能家居控制系统设计

为了使家庭生活更加舒适、安全、智能化,针对智能家居控制系统的应用需求和特点,对智能家居系统进行分析和研究,设计了一种基于Cortex-A9和Zig Bee的智能家居控制系统。系统由用户智能控制终端、嵌入式家庭网关和家庭Zig Bee无线网络三部分构成,能够实现安防报警,室内环境检测,家用电器控制和智能照明等功能。用户可以通过互联网登陆Web服务器对家居进行远程监控,或者通过Android手机的客户端远程与家居设备交互。实验结果表明,该智能家居控制系统方案运行稳定、可靠、实用性好。     

基于ZigBee技术智能大棚监控系统的研究

基于Zig Bee技术的智能农业大棚监控系统的研究工作,以往提出的智能农业大棚主要关注于监测大棚数据,同时通过人工对环境要素进行调节,因而,系统控制的实时性不够高,同时,过于依赖于人的经验。针对这一劣势,文章提出了基于Zig Bee通讯协议的智能监测与控制系统。该系统具有不完全依赖人的经验、实时性高、无需现场布线、采集点设置灵活、采集点覆盖面积广阔、系统运行周期长等多种优点。     

基于ZigBee和STM32的实验室无线远程管理系统

针对于人工完成实验室考勤工作量大、实验室防盗、防火灾、设备管理、环境控制自动化实现效率低等问题,提出了基于Zig Bee和STM32的实验室无线远程管理系统。系统利用RFID读写器实现门禁控制、到勤登记,利用GPRS和以太网网络功能实现实验室远程控制和管理,利用各类传感器进行防盗监测、环境监测和火灾监测,利用CC2541蓝牙节点设备码检测功能和RSSI定位能力实现实验室设备出入登记管理,利用Zig Bee的无线组网通信特性以及GPRS、TCP通信实现实验室无线远程管理。     

Incumplimiento del salario mínimo en Europa central y oriental

En este estudio se analiza el incumplimiento del salario mínimo durante el periodo 2003–2012 en diez países de Europa central y oriental con salario mínimo obligatorio nacional. A partir de los datos de EU‐SILC y la metodología propuesta por Bhorat, Kanbur y Mayet (2013), se cuantifica la incidencia y magnitud del incumplimiento. Se realizan análisis de regresión sobre determinantes individuales, laborales y macroeconómicos. Aunque la incidencia permanece relativamente baja, los trabajadores a los que se dirigen las políticas de salario mínimo parecen los más expuestos a su incumplimiento. Con el tiempo, una mayor incidencia se asocia a una razón más alta entre salario mínimo y salario medio.     

Cultural Economy Planning in Creative Cities: Discourse and Practice

While a growing body of research analyses the functional mechanisms of the cultural or creative economy, there has been little attention devoted to understanding how local governments translate this work into policy. Moreover, research in this vein focuses predominately on Richard Florida's creative class thesis rather than considering the wider body of work that may influence policy. This article seeks to develop a deeper understanding of how municipalities conceptualize and plan for the cultural economy through the lens of two cities held up as model ‘creative cities’ — Austin, Texas and Toronto, Ontario. The work pays particular attention to how the cities adopt and adapt leading theories, strategies and discourses of the cultural economy. While policy documents indicate that the cities embrace the creative city model, in practice agencies tend to adapt conventional economic development strategies for cultural economy activity and appropriate the language of the creative city for multiple purposes.     

Input/output ranges and performance: an examination of US machine tool producers

Despite the establishment of high-tech multinational enterprises (MNEs) in Ireland since the late 1950s, the country did not succeed in closing the technological gap with most of its EU counterparts. The weak National System of Innovation (NSI), and in particular low business and government R&D levels, combined with a lack of research and technology linkages between MNEs and indigenous firms, explain these poor results. However, the Shannon region in the West of the country presents some specific institutional characteristics that could theoretically make the region a strong technological enclave. The various actors in the region - i.e. the administrative, financial, political and research institutions, as well as the business organizations - have indeed infused a new type of economic development. After a brief review of the available concepts and models articulated around these actors and their interrelationships, the paper analyses whether the Shannon region, taken as an illustrative example, mirrors a specific economic and technological localized setting. The study is based on a survey of indigenous and foreign firms.     

Sixty years of discrimination and diversity research in human resource management: A review with suggestions for future research directions

This article reviews discrimination and diversity research published in Human Resource Management (HRM) over the past 60 years. While discrimination and diversity are very different constructs, it is often informative to study them together, because when people recognize each other's diversity, this can result in bias, stereotyping, and discrimination. We conducted bibliographic searches for terms related to discrimination and diversity as well as a manual search through every title and abstract published in HRM over the last 60 years to assess article relevance. The search resulted in 135 research articles with 136 unique studies (i.e., samples) which are reviewed in this article. Sex and race are the demographics that have been examined the most in HRM, while religion has been examined the least. Moreover, the number of studies examining lesbian, gay, bisexual, transgender, and queer (LGBTQ) employees in the workplace in HRM has grown quickly within the past 10 years, culminating in a recent meta‐analysis. Our review looks at some of the earliest research published, the most recent research published, and the overall trends we identified in the research over the years for both discrimination and diversity articles. We then make future research suggestions and recommendations to advance the study of discrimination and diversity in the coming years.     

The Early History of the Cumulants and the Gram-Charlier Series

The early history of the Gram-Charlier series is discussed from three points of view: (1) a generalization of Laplace's central limit theorem, (2) a least squares approximation to a continuous function by means of Chebyshev-Hermite polynomials, (3) a generalization of Gauss's normal distribution to a system of skew distributions. Thiele defined the cumulants in terms of the moments, first by a recursion formula and later by an expansion of the logarithm of the moment generating function. He devised a differential operator which adjusts any cumulant to a desired value. His little known 1899 paper in Danish on the properties of the cumulants is translated into English in the Appendix.     

Capturing the Implications of Services Trade Liberalization

This paper evaluates the impact of service sector trade liberalization on the world economy by a ten-region, eleven-sector CGE model with import embodied technology transfer from developed countries to developing countries. Simulation results show that service sector trade liberalization not only directly affects world service production and trade, but also has significant implications for other sectors in the economy. The major channel of the impact is through inter-industry input-output relations and TFP growth induced from services imported by developing countries from developed countries, which may be embodied with new information and advanced technology.     

City Children and Genderfied Neighbourhoods: The New Generation as Urban Regeneration Strategy

Former industrial cities in the West are employing gentrification as urban policy. In these policies, women and families currently play an important role as gentrification pioneers. In my analysis of Rotterdam in the Netherlands, I propose the term genderfication to understand the gender dimensions of this process. Genderfication refers to the production of space for different gender relations. I analyse Rotterdam's urban planning program for becoming a ‘child‐friendly city’, which entails replacing existing urban dwellings with new, larger and more expensive ‘family‐friendly homes’ as a strategy for urban re‐generation. Urban re‐generation supplements regeneration in the form of material and economic restructuring, and refers to the replacement of part of the current population by a new and better suited generation. The ‘child‐friendly city program’ is considered in tandem with punitive ‘youth policies’.     

Hierarchical Models in Environmental Science

Environmental systems are complicated. They include very intricate spatio-temporal processes, interacting on a wide variety of scales. There is increasingly vast amounts of data for such processes from geographical information systems, remote sensing platforms, monitoring networks, and computer models. In addition, often there is a great variety of scientific knowledge available for such systems, from partial differential equations based on first principles to panel surveys. It is argued that it is not generally adequate to consider such processes from a joint perspective. Instead, the processes often must be considered as a coherently linked system of conditional models. This paper provides a brief overview of hierarchical approaches applied to environmental processes. The key elements of such models can be considered in three general stages, the data stage, process stage, and parameter stage. In each stage, complicated dependence structure is mitigated by conditioning. For example, the data stage can incorporate measurement errors as well as multiple datasets with varying supports. The process and parameter stages can allow spatial and spatio-temporal processes as well as the direct inclusion of scientific knowledge. The paper concludes with a discussion of some outstanding problems in hierarchical modelling of environmental systems, including the need for new collaboration approaches.     

Multinomial distributions applied to random sampling of particulate materials

When sampling a batch consisting of particulate material, the distribution of a sample estimator can be characterized using knowledge about the sample drawing process. With Bernoulli sampling, the number of particles in the sample is binomially distributed. Because this is rarely realized in practice, we propose a sampling design in which the possible samples have a nearly equal mass. Expected values and variances of the sample estimator are calculated. It is shown that the sample estimator becomes identical to the Horvitz–Thompson estimator in the case of a large batch-to-sample mass ratio and a large sample mass. Simulations and experiments were performed to test the theory. Simulations confirm that the round-off error due to the discrete nature of particles is negligible for large sample sizes. Sampling experiments were carried out with a mixture of PolyPropylene (PP) and PolyTetraFluorEthylene (PTFE) spheres suspended in a viscous medium. The measured and theoretical variations are in good agreement.