农村党员干部现代远程教育视频资源管理方法的创新研究

阐述了＂ABC分析法＂和＂长尾理论＂,并将2种方法结合用于农村党员干部现代远程教育视频资源的管理。研究表明,这2种方法的结合使用可以有效实现管理效益。洞察开发视频资源在实际制作中存在的问题,及视频资源在网络教学中面临的实际情况,结合应用＂ABC分析法＂和＂长尾理论＂,提出了突破这一新课题的管理方法。     

Video tracking analysis of behavioral patterns during estrus in goats

Here, we report a new method for measuring behavioral patterns during estrus in goats based on video tracking analysis. Data were collected from cycling goats, which were in estrus (n = 8) or not in estrus (n = 8). An observation pen (2.5 m × 2.5 m) was set up in the corner of the female paddock with one side adjacent to a male paddock. The positions and movements of goats were tracked every 0.5 sec for 10 min by using a video tracking software, and the trajectory data were used for the analysis. There were no significant differences in the durations of standing and walking or the total length of movement. However, the number of approaches to a male and the duration of staying near the male were higher in goats in estrus than in goats not in estrus. The proposed evaluation method may be suitable for detailed monitoring of behavioral changes during estrus in goats.     

网络视频传输技术在水产病害在线诊断与咨询系统中的应用

随着网络技术的飞速发展,网络的应用越来越广泛。视频传输技术,视频流控制技术,带宽技术等新技术的应用,实现了视频和音频等连续媒体在网络中的传输。本文叙述网络视频传输技术在水产病害在线诊断与咨询系统中的应用。     

农产品视频履历追溯系统设计

针对目前农产品追溯系统中履历信息单一化和信息量少的问题,设计了一个以实现生产过程中质量追溯为目的的农产品视频履历追溯系统.基于ARM9嵌入式技术与H.264压缩技术相结合对农产品生产过程进行视频履历的采集和压缩处理,应用3G无线传输技术对视频履历进行传输,通过生产服务器对视频履历进行存储,以.NET为平台开发了用户对农产品视频履历追溯系统的软件.该系统可采集农产品生产过程各个阶段的视频履历,为农产品追溯提供了更直观、更丰富、更具说服力的履历信息.该系统运行结果表明,系统具有通用性强、可靠性高、稳定性好、便携式等特点,可方便地应用于温室、农田等各种农产品生产的环境,从而满足用户的不同需求.     

面向蔬菜病虫害视频移动获取的网络互通网关设计

网络互通问题是限制移动视频获取的关键技术瓶颈,为解决此问题,在前期关于视频分割、压缩、标注、检索等一系列研究基础上,设计出面向移动视频获取的网络互通网关,最终实现蔬菜病虫害视频的移动获取。首先对视频电话网络和IP网络的网络协议3G-324M和H.323进行了详细分析。进而基于不同网络协议原理的分析,设计出3G-324M与H.323的互通网关,包括信令网关和媒体网关两部分:信令网关负责处理信令(信号),实现视频电话网与IP网络间呼叫层面和系统层面的控制和互通;媒体网关负责数据传输,实现视频电话网与IP网络间媒体和数据层面的控制和互通。最终基于前期的研究基础和本文设计的网络互通网关,构建了蔬菜病虫害知识视频移动获取模型,实现了蔬菜病虫害的视频移动获取。此外还对视频获取模型进行对比试验,通过与传统方法的比较,证明所设计的网络互通网关和移动视频获取模型具有理论和实用价值。     

校园视频直播系统的设计与实现

很多学校经常举办大型的会议、论坛、名人讲座和文艺汇演,由于参加人数众多,经常会出现会议场地不够的情况.因此,建立规模适度、经济可行且先进可靠的校园视频直播系统是各学校都在寻求的解决方案.本文从实际出发来探讨校园视频直播系统的设计与实现.     

8×4视频切换器控制系统

用ＭＣＳ－５１单片机控制８×４视频切换器，其中４路为视频输出，８路为视频输入，对８路云台和８路镜头进行控制，主控制器可以是一台计算机，专用控制盒或其它设备，本对其硬件实现和软件中使用的命令介绍一种应用方法。     

Accuracy of a machine-vision pellet detection system

Video cameras are employed on net pen fish farms for monitoring food pellet levels near the cage bottom. Herein, the accuracy of a new machine-vision system for the identification of a feed-wastage event and its response time are reported. Research involved novel tests and definitions, video footage recorded under different stocking and environmental conditions, and numerical filters to reduce the effects of misclassifications and patchiness of the pellet wastage record on overall system accuracy. Single-frame food pellet detection accuracy was based on the difference between computer-generated and actual frame counts of pellets greater than 30 pixels in size. A pellet wastage event was defined as a median of three or more visible pellets per frame. During tests on still video frames from different feeding events, the system missed 0.1±0.1 to 1.3±0.4 pellets frame⁻¹, and miss-classified as pellets 0±0.1 to 2.3±0.5 objects frame⁻¹ (n=264). Most missed pellet images were on top of fish images. Waste matter accounted for 65% of the misclassifications, while particles associated with poor camera maintenance accounted for approximately 24%. The average response time to a pellet wastage event was 5.1 and 11.4 s for sampling rates of 2 frames s⁻¹ and 0.5 frames s⁻¹, respectively (n=20 different pellet wastage events). The longest response time (26 s) occurred when fish were amassed against the camera and/or covering pellets. Using appropriate camera lens, camera positioning and/or ‘warning’ software can address fish-interference problems.     

第8届雨水收集利用国际学术会议概况

第８届国际雨水收集利用大会１９９７年４月２１至２５日在伊朗德黑兰召开，有４０多个国家的１３００余名代表参加，提交论２７４篇，出版论集４卷。会议内容丰富，有大会交流和１０个专题报告，会后代表分６条路线对伊朗考察。我国到会１９人，提交论１２篇，考察西北冷凉半干旱区，下届国际雨水收集利用大会定于１９９９年在巴西召开。     

Testing the utility of abiotic surrogates for marine habitat mapping at scales relevant to management

Habitat mapping at the scale at which marine protected areas are designed and managed is essential for assessment of, and design for, representation. Most habitat mapping studies rely solely or in part on abiotic surrogates for patterns of biodiversity. The utility of abiotic variables in predicting biological distributions at the local scale (10 s of km) was tested in a remote video survey of macrobenthos in Moreton Bay, Australia. Habitat classifications of the same set of 41 sites based on 6 abiotic variables and abundances of 89 taxa and bioturbation indicators were compared using correlation, regression and ordination analyses. The concepts of false homogeneity (abiotically similar but biologically distinct) and false heterogeneity (abiotically distinct but biologically similar) were defined to describe types of errors associated with using abiotic surrogates to construct habitat maps, and quantified using two separate methods. Overall, the best prediction by abiotic surrogates explained less than 30% of the pattern of biological similarity. Errors of false homogeneity were between 20% and 62%, depending on the methods of estimation. Predictive capability of abiotic surrogates at the taxon level was poor, with only 6% of taxon/surrogate correlations significant. Abiotic variables did not discriminate sufficiently between different soft bottom communities to be a reliable basis for mapping. These results have implications for the widespread use of abiotic surrogates in marine habitat mapping to plan for, or assess, representation in marine protected areas. Little confidence can be placed in marine habitat classifications based solely or largely on abiotic surrogates without calibration by rigorous biological surveys at the appropriate scale. Therefore, it is questionable whether marine protected areas designed on this basis can have measurable benefits for conservation.