基于嵌入式的无线温室环境监测与控制系统设计

文章针对传统温室监测与控制系统的布局复杂、成本高等缺点,设计了基于嵌入式温室环境监测与控制系统,采用Linux操作系统、ZigBee无线通信技术,S3C6410作为微控器。实现对环境数据的实时传输和显示,系统的自动化操作。通过对温室大棚内空气、土壤温湿度的监测与智能控制,实现了生产自动化、高效化。     

智能化温室自动控制系统设计研究

设施农业的重要组成部分是温室,而温室智能控制系统是实现温室生产管理自动化、科学化的根本保证。大棚内的环境由温度、湿度、二氧化碳浓度等多种因子构成,温室智能控制系统可以做到温湿度检测、实时显示、信息存储及实时控制等功能,为提高农业产品质量和生产效率,对这一系统的研究就显得更加重要了。本系统采用层次化、模块化设计,将数据采集系统、单片机控制系统、计算机监控系统集于一身。系统以单片机为核心,通过分析湿度、温度传感器所获数据,并结合作物自身的成长规律来控制其环境条件。这样既能对作物生长状态进行全面、实时、长期的监测,又能对温室环境的温湿度实时智能控制,从而使作物能够在各种环境中都可以更好的生长,达到优质、高产的目的。     

西门子(SIEMENS)自动化控制系统的设计与运用

西门子PLC自动控制系统包括生产过程控制系统、测量系统、防雷和接地系统等部分。通过现有的总线技术、PLC、监测仪表、执行设备和PC监测设备,形成一个高效、实时和可靠的网络自动化操作系统。文章对西门子自动化控制系统的设计与应用进行了探讨。     

PLC及无线通讯技术在选煤集控系统的探讨应用

通过PLC主机完成整个选煤线的顺序控制、闭环控制、状态监测、显示、无线通讯系统和下位机控制系统组成,实现选煤厂生产过程控制,管线敷设量很大程度的减少,减少了电气安装工作量,费用大大降低。解决了通讯线缆布线复杂、电缆损坏率高的技术难题,实现集中控制系统数据无线通讯和自动化水平的提高以及无线网络的覆盖,能够推动选煤行业网络化和自动化技术的进一步发展。     

西门子LOGO!及其在温室控制中的应用

本文介绍了LOGO!控制器的特点,分析了以LOGO!230RC为核心构建的小型温室自动化控制系统,系统通过传感器检测温室环境信息,使用相关装置控制温室参数恒定,系统开发周期短,可靠性远大于一般单片机系统,性价比高。     

略谈换热站智能控制系统的设计与应用

介绍了换热站智控系统的构成、控制系统原理、系统功能及控制策略等,将数据通讯系统、调度中心管理系统有机结合起来,采用一体化的数据采集、控制装置,实现换热站的自动化监测与控制,实现换热站、公共建筑的自动化数据采集、计量、分析与控制,主要满足热力公司能源管理、换热站及建筑节能控制要求,达到提高供热服务质量,降低能源消耗的目的。     

西门子LOGO！及其在温室控制中的应用

本文介绍了LOGO！控制器的特点，分析了以LOGO！230RC为核心构建的小型温室自动化控制系统，系统通过传感器检测温室环境信息，使用相关装置控制温室参数恒定，系统开发周期短，可靠性远大于一般单片机系统，性价比高。     

温室远程智能信息采集系统的研究

针对当前我国温室科技含量低、生产水平落后,为了实施有效的温室环境控制,提出了一种以ARM系列处理器s3C24IO为核心的温室环境远程信息采集系统的设计方案,实现了一个快速、准确、性能较好的温室环境远程智能控制系统,以此来完成温室内的温度、湿度、光照等参数的控制。实现了对温室环境信息的参数采集。     

基于神经网络自适应控制的温室温度控制研究

<正>随着温室农业的发展,温室控制技术也得到相应的发展,并在相关技术的支持下发展飞速。早在上世纪60年代,温室控制系统就已引入了计算机技术,并且随着计算机技术及相应传感器技术的发展,温室中环境因子的控制技术也得到了相应的发展。上世纪七八十年代,美国、荷兰等国家已经开始引进微型计算机对植物的生长环境进行控制,也使不同的环境因子对温室环境的综合控制技术有了很大的进步。随着科学技术的创新和发展,温室控制技术正向完全自动化甚至是智能化的     

基于虚拟仪器技术的温室控制系统研究

本文结合工作实践,从研究虚拟仪器技术的温室控制系统的原因及意义出发,在分析我国温室检测技术的研究现状基础上,提出了温室检测系统研究方案和对温室技术的展望。把计算机技术、传感器技术等技术结合起来的问世控制系统,主要针对一定环境中控制植物的生长,分析对它们在生长过程中受到环境中各种因素的影响,如何才能合理地控制这些配套设备的运作和协同则需要有一套完善的硬、软件温室系统进行控制。本系统应用虚拟仪器LabVlEW软件进行检测软件的设计与实现来采集和分析数据。     

Development in Information and Communications Technology (ICT) Statistics at the Australian Bureau of Statistics

This paper outlines the ICT statistical developments that the ABS has undertaken over recent years. These developments have been on both the supply side (ICT industry) and the demand side (use of IT by sector). The content of ABS ICT surveys has changed significantly over the last few years and are expected to develop further in line with industry changes and emerging policy needs.
Recent developments in household collections have been the inclusion of IT use questions in the 2001 Census of Population and Housing and in various ABS social surveys such as Children's Participation in Culture and Leisure Activities. Annual business IT use surveys are now conducted and include topics such as Internet commerce and IT security. Biennial ICT industry surveys are conducted to provide data on ICT production, imports and exports, ICT industry employment, performance and structure information. An Internet activity survey is run every six months and provides regional Internet access details and infrastructure details on Internet service providers.
A major development for 2002–03 will be the compilation of an ICT satellite account. ABS intends to produce an ICT Information Development Plan to guide its future statistical development work in the ICT field.     

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.     

Value at Risk in the Suburbs: Eminent Domain and the Geographical Politics of the US Foreclosure Crisis

Several US counties and local governments have recently considered a novel solution to the foreclosure crisis. They plan to use eminent domain to compel the owners of mortgage debt—and specifically of private‐label mortgage‐backed securities—to sell the debt to the government at a price reflecting the loan's market value. The government would then restructure the debt and resell it to new investors. The plans are striking because—in contrast to both development‐driven eminent domain and the federal subprime bank bailout—they would force investors to assume asset devaluation and increased long‐term risk. Notably, the plans have emerged as an instance of financialization‐focused politics in suburbs and suburban cities of color, specifically majority‐black and ‐Latino/a suburbs. Local support for the plans, we argue, is rooted in the long‐term disinvestment of these ‘suburbs of exception', which became targets of subprime lending and eventually sites where the ‘financial exception' has been localized. But these demographic shifts, fragmentation and fiscal pressures have at the same time created a suburban political terrain in which the plans have gained their strongest political support.     

Towards a Theory of Serendipity: A Systematic Review and Conceptualization

Serendipity – the notion of making surprising and valuable discoveries – plays a major role in the success of individuals and organizations alike. Previous research has established the importance of serendipity and identified important individual- and organizational-level antecedents. However, the literature has been dispersed and the boundaries of the concept have been blurry, leading to a lack of conceptual clarity and structure, and thus limiting validity and managerial actionability. Based on a systematic literature review, I synthesize existing management-related research on serendipity and explicate the emergence and composition of serendipity in the organizational context. I first identify three necessary conditions that differentiate serendipity from related concepts such as luck or targeted innovation: agency, surprise, and value. Then, I draw from the literature on sensemaking, event-based theorizing, and quantum-based approaches to management to conceptualize the process of cultivating serendipity in the organizational context as a process of enabling potentiality and materialization, and develop a multi-level theory of (cultivating) serendipity. This conceptualization contributes to our collective understanding of how, why, and when (i.e., under what conditions) organizations can leverage the value in the unexpected, which opens up fruitful avenues for further research.     

Accountability of NGOs in Bangladesh A critical overview

NGOs in Bangladesh have been recognized as effective change agents in the socio-economic arena throughout the world. Their contributions in micro credit, non-formal education and primary health care are widely known. NGOs play a significant role in society. NGO accountability, as a result, has become a critical issue. NGO accountability in Bangladesh has been examined here in relation to patrons, clients and themselves. Of the three relationships only accountability to patrons is in a near satisfactory state. Accountability to clients is handicapped by lack of opportunities of beneficiaries to participate meaningfully in NGO policy making. Accountability to themselves is adversely affected due to the adherence to a strictly hierarchical system and the influence of founding and charismatic NGO leaders.     

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.     

Towards an Asian model of human resource management? A comparative analysis of China,Japan and South Korea

There has been much discussion regarding the possible decline and weakening of national systems of human resource management (HRM). Yet, culture and institutions are often cited as the major stumbling blocks to this outcome. Such constraints may dissipate in the analysis, particularly if ‘regional clusters’ are considered where geographic and cultural closeness and ‘openness’ to similar economic pressures exist. In such cases, it might be postulated that convergence in HRM will occur. We argue that China, Japan and South Korea represent such a cluster. This article examines these countries, to see if a degree of convergence is taking place and if it is towards an identifiable ‘Asian’ model of HRM. A model of change is presented that distinguishes between levels of occurrence and acceptance. Details of the development and practice of HRM in each country are then set out. The article ends with a discussion and implications section and a brief conclusion.     

Ansätze und Ergebnisse anglo-amerikanischer M&A-Forschung

Based on a review of established U.S. management journals (1995–2003), six schools of thought are identified within the Anglo-American M&;A research: “Capital Market”, “Principal/Agent”, “Industrial Organization”, “Organizational Behavior”, “Human Resources” and “Strategic Management”. The literature review shows that the definition of M&;A success, the methods applied, and insights from empirical research differ according to the respective school of thought. Empirical studies focus on the resource combinations of merger partners, the specific circumstances of merger negotiations, and on integration management as antecedents of merger performance. Unfortunately, empirical findings have not yet provided reliable explanations for M&;A success. Based on the current state of Anglo-American M&;A research, the authors discuss implications for business practice, identify research gaps, and propose areas for future research.