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基于单源分段编码的无线对等感知网数据收集模型
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作者 尹子铭 袁松 《计算机测量与控制》 2023年第12期195-202,共8页
针对触发型数据场景下大规模无线对等感知网络的部分数据收集问题,提出一种基于单源分段编码的数据收集模型;利用单个源节点的多个分段之间编码而成的数据来记录源数据,提高数据可靠性的同时使其适应大规模网络下的部分数据收集;通过使... 针对触发型数据场景下大规模无线对等感知网络的部分数据收集问题,提出一种基于单源分段编码的数据收集模型;利用单个源节点的多个分段之间编码而成的数据来记录源数据,提高数据可靠性的同时使其适应大规模网络下的部分数据收集;通过使用游走包进行编码操作,避免源节点过多的能量消耗;同时针对节点存储空间提出动态划分编码单元策略,利用邻居间的信息交换动态调整源数据切分的编码单元大小,实现节点存储空间与收集效率的动态调整;并针对灾难场景下的数据收集提出了危险感知编码冗余量动态调整策略,通过对邻居状态的感知动态调整发送随机游走包的个数,自适应地提升编码冗余量,提高数据恢复率。 展开更多
关键词 大规模无线对等感知网络 动态自适应编码 触发型数据 部分数据收集
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美国的职业教育相关数据(DOVE)系统
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作者 范骏 《中国职业技术教育》 2002年第18期56-58,共3页
译者按:在美国的国家教育统计中心(National Center for Education Staustics)有一个职业教育相关数据系统(The Data on Vocational Education System).此系统的主要工作是收集有关职业教育的详尽数据,为国家制定职业教育政策提供依据.... 译者按:在美国的国家教育统计中心(National Center for Education Staustics)有一个职业教育相关数据系统(The Data on Vocational Education System).此系统的主要工作是收集有关职业教育的详尽数据,为国家制定职业教育政策提供依据.这个系统的重要性是不言而喻的,它记录下了美国职业教育发展的轨迹,为后人的研究提供了参考资料.本文由三个部分组成:DOVE系统的历史、DOVE系统简介和DOVE系统的完善. 展开更多
关键词 美国 职业教育 数据系统DOVE 数据收集部分 复查调查工具
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Homegardens as a Source of Income for Rural Households A Case Study of Bieha District, Southern Burkina Faso
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作者 Reginald Tang Guuroh Holm Uibrig Emmanuel Acheampong 《Journal of Agricultural Science and Technology(B)》 2012年第7期798-813,共16页
This exploratory research studied the contribution of homegardens to household income generation. In Burkina Faso, the Bieha department was purposively selected. The initial rapid rural appraisal was complemented by a... This exploratory research studied the contribution of homegardens to household income generation. In Burkina Faso, the Bieha department was purposively selected. The initial rapid rural appraisal was complemented by a household survey. Tools of data collection included observation, key informant interview, and focus group discussion. For the survey, eighty households were selected based on systematic sampling. Data was collected by individual interviews at household level, and for statistical calculations, the households were subsequently categorized as small, medium and commercial based on their homegarden size. It was found that all the surveyed households managed homegardens composed of trees, crops and animals. Majority of the farmers (43%) belonged to the small category due to land constraints. Generally, farms contributed more income than the plant component of homegardens. However, when the livestock component of homegardens was added, homegardens became far more important than farms and accounted for over 60% of income generation for all categories. It can be concluded that homegardens are important to rural people for food and cash income. 展开更多
关键词 AGROFORESTRY land fragmentation population growth livelihood.
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