基于STM32的物联网嵌入式网关的设计

针对物联网在智能传感器控制中的广泛应用,采用嵌入式技术,利用现代高速发展的网络平台设计了服务于物联网智能采集系统的嵌入式网关。嵌入式网关的系统由STM32F嵌入式主设备、路由器、GPRS模块及无线协调设备组成,主设备系统采用μC/OS-II操作系统,通过百兆网口与路由器连接;通过串口与GPRS模块及无线协调设备连接,从而实现数据的实时显示功能、历史数据存储功能、网关控制参数设定及查询功能、Internet网远程访问与控制功能、GPRS网远程访问与控制功能。     

工业物联网网关设计

随着万物互联概念的提出以及微信使用的普及化,为了提高工业物联网(IIoT)技术的高效性、安全性和数据共享性,利用物联网技术,设计了一种IIoT网关。IIoT网关主要由供电模块、主控芯片、通信接口、系统时钟和按键LED构成。分别对网关软件初始化程序、MQTT处理程序和串口通信程序等流程进行了介绍。该网关通过串口和设备进行通信,获取设备运行参数;在联网后,网关作为工业应用(APP)软件的客户端,将获取的设备运行参数上传到服务器。用户可在APP中实时查看设备运行状态和设置设备运行参数。实际应用表明,基于物联网技术的IIoT网关实现了设备的远程监控。IIoT在后续的方案优化中,网关考虑采用WiFi和4G/5G移动网络模式相结合的形式,实现不同场所网络的灵活切换。     

可配置物联网网关设计与实现

物联网网关作为物联网技术的核心组成部件,具有承上启下的作用。然而各类智能终端设备的数据传输协议、格式都无法保持一致,导致每种设备的数据采集都需要开发有针对性的物联网网关程序,不仅网关设备难以复用,二次开发难度高,还存在随着数据采集需求增长而导致云端负载过大的问题。为此,文中提出了一种层次化的物联网网关框架,该框架基于分层思想,将网关功能分为5个层次：感知层、数据处理层、边缘计算层、传输层和应用层,五层框架结合配置客户端即可实现完整网关功能。     

服务国外市场的AIoT开源方案及其应用

国内物联网整体解决方案应用于国外客户时,面临个人隐私、互联互通、易用性、价格、选择性和定制等方面的挑战。针对国外市场提出了一种人工智能物联网AIoT开源解决方案用于应对上面的挑战。解决方案包括智能传感器和执行模块、具有物联网网关功能的开源物联网边缘终端和开源物联网云平台,并通过一个简化的智能酒店房间的设计实例进行说明。本方案力求从客户需要和用户体验出发,为客户提供本地最简联网到复杂的云端管理和控制等可选项,让人工智能、云计算等技术贴近用户而不是过度炫耀这些技术。本文AIoT开源解决方案让国外客户不用担心方案提供商会获取他们的个人隐私。同时,国外客户在产品,尤其是传感器和物联网设备上有更多的选择并获得更高的性价比。对于国外行业客户来说,则更容易为最终用户实现行业产品定制。     

边缘计算网关中一种可视化配置调试软件设计

边缘计算网关作为电力物联网系统中连接末端和平台的核心装置,其内部开发各类通信协议App,实现综合能源在各应用场景下的数据实时采集,就地分析、处理和上送,减轻云端的计算和存储压力。面对底层多样的接入设备,各通信协议App的运行需要针对性配置采集信息,形成配置文件。依据工程实际需要,基于Qt软件设计一种应用于综合能源领域,用于边缘计算网关的数字化通信报文分析、调试及点表配置的可视化配置工具。通过提供一个直观的界面,用户可以快速设置边缘计算网关的参数和功能,生成各配置文件,然后将配置文件下载到网关中,网关启动后能读取配置文件,实现网关的下行通信、上行通讯,并可实时监视通讯状态等。可视化配置调试工具的开发,方便了技术人员对网关进行现场调试,实现灵活、快捷的工程配置,缩短了工程项目周期。     

IPv6物联网接入网关的设计实践

在智能农业大棚物联网系统中,传感器节点采集的数据需通过互联网上传到远程服务器,Contiki节点间使用6LoWPAN,与传统的IPv4不能直连,需配置一个物联网网关. 通过移植OpenWRT系统至HG255D无线路由器,使得该路由器成为一个小巧、实用的嵌入式Linux系统,能够运行开源或自行开发的程序. 本文将介绍如何在HG255D路由器上实现IPv6物联网接入网关设计的过程. 主要涉及OpenWRT固件的编译、路由器配置修改、网关程序的移植,以及效果演示.     

基于物联网网关的传感器接入方案设计

物联网被看作信息领域一次重大的发展和变革机遇,物联网网关是连接传感器网络与互联网网络的接入与控制设备,传感器收集数据并通过网关实现与互联网的互连及进一步的处理和转发。本文首先介绍了物联网技术背景,在此基础上提出了基于物联网网关的传感器接入方案,并以LDAP作为开发环境,实现了传感器接入的信息存储方案。     

基于EMQX云平台与ESP-WiFi-MESH的物联网系统设计与实现

设计基于EMQX云平台与ESP-WiFi-MESH的物联网系统,该系统将ESP8266-NodeMCU模块作为核心控制部件,使用Arduino IDE平台开发物联网网关与智能设备。智能设备可以通过各类传感器检测到现场状态信息,例如：使用DHT11传感器检测环境温湿度,使用HW-824传感器检测土壤湿度,使用MQ-135传感器监测空气中有害物含量等,随后通过ESP-WiFi-MESH网络连接到物联网网关,并定时将各类状态信息经EMQX平台数据转存至本地/云端数据库中。使用者也可以使用手机软件控制智能设备,例如：使用SRD-05VDC-SL-C继电器模块控制电路的开闭,使用28BYJ-48实现对步进电机的转向速度和旋转角度的控制等。     

通用可靠的串口/以太网网关设计

介绍了一种串口/以太网嵌入式网关的设计方案,详细讨论了串口可靠通信的实现方法,并在开源操作系统RT-Thread和微处理器S3C2440开发板的软硬件平台上实现。网关实际应用于一个无线传感器网络项目,实验表明该网关能实现可靠的数据通信。     

蓝牙技术联盟开放网关架构

蓝牙技术联盟（Bluetooth Special Interest Group ,简称SIG）宣布开放蓝牙网关架构并推出入门工具套件,助力开发者快速为蓝牙产品创建互联网网关。有了蓝牙网关,具有蓝牙功能的传感器就能通过蓝牙技术连接网关设备,向云端传递数据并进行数据交换。全新架构让所有人都能对固定式的、具有蓝牙功能的传感器进行远程监测和控制,借此扩展物联网的潜在应用领域。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.