基于WEB的网络视频监控技术研究

将视频监控与Internet相结合,通过浏览器进行远程监控。使用VFW软件包,通过摄像头实现对视频信号的采集、编码、存储以及视频数据的网络传输;PC机将作为Web服务器在Internet上发布实时监控信息。实现远程用户在不使用第三方插件的情况下使用浏览器实施监控。满足视频应用程序开发的需要。     

新型城镇化背景下异地城镇化的特征及趋势

目前,我国城镇化水平仍然滞后工业化,区域城镇化发展不平衡.其中,城镇化过程中低质量的“异地城镇化”现象非常明显.在城镇化加速发展时期,如何保持“城镇化数量与城镇化质量”的健康协调发展,缩小区域城镇化差距,提高后发地区域镇化质量,具有十分重要的意义.本文以湖北省为例,针对“异地城镇化”的特点和问题,重点探索新时期“异地城...     

基于web的区间信号多媒体教学系统的设计与实现

本文从《区间信号》课程传统教学手段所存弊端出发,论述了《区间信号》多媒体教学系统的指导思想、所用技术以及系统结构,着重阐述了积件思想及其在系统中的运用.     

高性能硅橡胶按键的制造

<正> 一、期货交易限制 从事商品期货交易的人最关心的是瞬间的价格波动,并以此来判断买进或卖出的时机。为有利于交易的正常进行,使市场在受到某种力量推动导致行市暴涨或狂跌时,可以停止交易,使交易者能有充分时间证实行情动态,证实消息并据以预测价位,以保障交易者在短时间内不受太大的损失,价格不出现剧烈的波动。所以,世界各大交易所对不同的期货商品价格有多种限制性规定。     

城市热岛与城市空间发展的关系探讨--以厦门市为例

研究了厦门市1989年到2000年的城市热岛与城市空间扩展的关系.Landsat卫星影像被用来研究城市的空间扩展和反演地面的热辐射.利用创建数字亮温模型(DBM)及其三维城市热岛分布图、对不同时相的影像进行正规化处理和引入城市热岛比例指数(URI)等技术方法,揭示了厦门市城市热岛的空间分布及其变迁.研究表明厦门市城市热岛的分布和城市建成区的分布基本吻合,二者有着密切的空间联系.进一步分析发现,虽然厦门市城市热岛分布范围在这11年间随着城市的扩展有了扩大,但城市热岛比例指数却表明厦门市的热岛现象有一定的缓解.特别是在厦门市重点改造的老城区,其热岛现象得以明显的减轻.根据植物、湿度和温度之间的三角关系研究,建议厦门市今后在城市发展中还要多植树,少填水面,以进一步缓解城市热岛.另外,还提出了使用浅色、高反射率的建筑表面材料和铺路物质以作为缓解城市热岛的又一重要举措.     

运动车辆提取算法研究

在监控系统的背景中往往有活动的物体,给运动目标的提取造成一定的困难。文章分析了背景中静止不动的物体及背景中做类周期性活动的物体。利用像素灰度归类的方法,在一个或多个灰度区间里,根据表示静止不动的背景和做类周期运动的背景来对运动物体进行提取。此方法消除了做类周期运动的非运动物体对运动物体提取的影响。     

物流企业网络视频监控系统的设计与实现

物流企业利用现代的网络监控录像技术及数字监控控制技术等先进的技术手段,可延伸管理人员的视觉,帮助管理人员对公司的办公、仓库、货物搬运情况,以及人员活动和设备情况进行监控。本文设计了基于C/S模型的网络数字视频监控系统并对其关键技术作出了分析。最后,给出了有效的网络视频监控系统实施方案。     

Assessing urban growth and rural land use transformations in a cross-border situation in Northern Namibia and Southern Angola

The Okavango catchment is a hot spot of accelerating land use change. In particular, climate predictions, demographic developments and a growing utilization of ecosystem services and functions are expected to increase pressure on resources and land. Land use conflicts, the sustenance of precarious livelihoods, deforestation of woodland savannahs, upstream–downstream water issues and human–wildlife conflicts are among the processes that are characteristic of policy and management challenges in the region. In the Eastern and Western Kavango regions of Namibia and the Cuando-Cubango province of Angola, a unique cross-border situation exists that allows assessing how the combination of local traditions, regional land management and national policies determines spatial patterns of land use and land cover transformation processes.To map major land use types and change processes we used a set of multi-temporal Landsat-5 TM and Landsat-7 ETM+ data sets, support vector machine (SVM) classification and iterative spectral mixture analysis (ISMA) on images covering the period from 1990 to 2010. Integrating satellite imagery with literature reviews, interviews, census and household survey data, we assessed the contrasting development of resource utilization on both sides of the Okavango River. We investigated if and how policies and regulations at different levels drive land use decisions, and how these decisions manifest spatially.We found a strong and interconnected urban growth on both sides of the river. The area around Rundu has constantly been evolving to become Namibia's second largest city, also functioning as a hub of development and transborder commerce with opposing Calai. This trend was found to affect adjacent settlement areas and cause widespread conversion of woodland savannahs to agricultural land or their utilization for timber extraction. The conversion of woodland savannah to arable land was by far the dominant land use change process on both sides of the river, with a total conversion area of 460 km² (Namibia) and 293 km² (Angola) observed during the observation period. Strong spatial change gradients occurred in relation to determining factors, such as accessibility, proximity to water, urban centres, etc., while relations to settlements where less obvious. Assessing results by country illustrated the difference in land use intensity and resource consumption between Angola and Namibia, which relate directly to historical developments, with a long period of stability in Namibia standing opposed to the recent and ongoing recovery from civil war in Angola. These are added to by statutory and traditional policy frameworks, the national endowment with natural capital (e.g. oil, uranium, diamonds, zinc) and the integration into global markets, which strongly affects national economies of both countries at large.Underlying land use decisions were found to be largely driven by individualized perspectives on growth ideologies, consumerism and wealth-aspirations connected to globalization processes. However, at present the result of these perspectives is still mainly a small-structured conversion to rainfed agriculture as a component of subsistence strategies of local livelihoods, and thus stands opposed to other regions of the world, where change processes are much more driven by large companies or follow national regulations and result in more intensive uses.     

基于影像分析法的标准工时测定方法研究及应用

本文在传统标准时间测定方法的基础上,把影像分析由动作研究扩展到时间研究领域,提出了一套新的测定标准时间的方法——影像分析法。本文建立了该方法的操作流程,介绍了影像制作标准以及评比人员培训方法,规范了速度评比系数、工作状态评比系数、作业难度评比系数三个修正系数的确定标准,并列举了实例计算演示方法的应用过程。     

Comparison of land use change in payments for environmental services and National Biological Corridor Programs

Costa Rica established the National Biological Corridor Program in 2006. Under the National Biological Corridor Program, the long-running Payment for Environmental Services Program was newly prioritized into biological corridors throughout the country. The National Biological Corridor Program caused a nationwide spatial shift in placement of payments for environmental services throughout Costa Rica. We classified ASTER 15-m resolution imagery in a central Costa Rica corridor connecting the eastern and western protected areas networks to analyze the change in forests during the National Biological Corridor Program with its targeted payments for environmental services effort. We used object-based classification methods, and compared land cover changes over an initial four-year period of corridor policy enactment. We calculated the changes within PES properties and outside of PES regions, and we also calculated forest patch metrics during the same time period. Results indicate a decline in forest cover over the study period, along with an increase in urban and pasture land covers, with higher change and loss of forest centered inside of the biological corridor, near the construction area for the new San Carlos highway, and within eastern pasture areas. We also saw a higher percentage of forest loss inside of the biological corridor area as compared to areas outside of the biological corridor. Forest loss was drastically less within current and historic PES properties, as compared to the overall study region. Across the entire study region, patch metrics show a decrease in the number of patches and a slight decrease in average patch size. These results suggest that current and past designation of PES prevents forest loss within PES properties while the current designation of priority conservation status via the National Biological Corridor Program is not increasing connectivity and forest conservation. This is shown by increased land use change and a decrease in forest associated with biological corridor designation. These results are antithetical to the goals of the National Biological Corridor Program.