搜索到28590篇“ COVERAGE“的相关文章
具有VCT意识及媒体报道影响的HIV/AIDS感染动力学模型
2025年
构建一类具有VCT(voluntary counseling and testing)意识及媒体报道影响的HIV/AIDS感染动力学模型.首先得到模型解的适定性,并给出模型的基本再生数.其次,借助Hurwitz判别法及Lyapunov函数分析模型的阈值动力学,当R_(0)<1时无病平衡点局部渐近稳定且当R_(0)≤1时全局渐近稳定;当R_(0)>1时,地方病平衡点局部渐近稳定.进一步,结合持续生存理论给出疾病的一致持续性.最后,数值模拟表明随着VCT意识比例的提高,艾滋病患者人数的峰值逐渐降低,而随着信息失效率的增大,艾滋病患者人数的峰值将有所提高.
苑运强罗颜涛胡西尼格尔·吐尔地
关键词:媒体报道稳定性
唐山市植被覆盖度时空演变及地形因子的响应
2025年
植被覆盖度在生态环境质量评价、地表过程监测和生态保护决策等方面发挥着重要作用。研究基于GEE平台,采用像元二分法获取唐山市不同时段的植被覆盖度。通过Sen趋势分析和MK检验探讨植被覆盖度的时空演变情况。利用GIS叠加分析研究植被覆盖度与地形因子的关系。结果表明:(1)唐山市植被覆盖度稳定,城市建设区域和南部沿海地区较低,中部和北部低山区较高,中等级及以上占比超过65%。(2)在2001~2021年间,唐山市的植被覆盖度轻微改善,改善面积达到了39.041%。(3)植被覆盖度与高程和坡度显著相关,特别在高程200米以上和坡度15°~32°范围内,中高等级和高等级植被覆盖度较高。探究植被覆盖度演变对该地区的生态环境改善具有重要意义。
曹琳吴风华
关键词:植被覆盖度地形因子
老龄化、养老金覆盖率与水平对养老金支付负担的影响研究
2025年
人口老龄化是影响基础养老保险制度可持续性的关键因素。基于年龄移算法和生命表技术,以第六次与第七次全国人口普查数据为基础,测算2010-2030年中国领取养老金的老年人口规模、年限与资金规模。研究发现:由于老龄化程度加深与养老保险覆盖面扩大,中国领取养老金的老年人口规模持续扩大,从2010年的1.23亿人增加到2030年的3.32亿人。与此同时,中国养老金领取水平逐渐提高,养老金支付负担与日俱增,支出总额至少从2010年的13293.90亿元上涨至2030年的118933.19亿元。此外,由于老年人口余寿的显著延长,老年人领取养老金的年限也不断延长,从2010年的10.13年延长到2030年的19.92年,领取年限延长速度超过余寿延长速度。另外,养老金的支付负担还存在明显的性别与城乡差异。故而,提出落实延迟退休政策、慎重上调养老金替代率与养老金水平等参量变革措施、发展多支柱养老金模式、鼓励生育等结构改革举措,在人口与经济高质量发展中促进共同富裕。
陈友华孙永健
关键词:人口老龄化延迟退休共同富裕
新型城镇化、城镇居民养老保险覆盖率与消费结构升级
2025年
为探索城镇化进程中城镇居民养老制度发展对带动消费增长的作用,从城镇化水平和城镇居民养老保险覆盖率两个维度出发,构建了居民消费结构升级的理论分析框架,利用双向固定效应模型对该效应及其异质性进行实证检验。研究结果表明,一方面,提高新型城镇化水平和扩大养老保险覆盖率有利于居民消费结构升级;另一方面,城镇化水平的提升对东部地区居民消费结构升级有显著正向影响,对西部地区的影响不显著,养老保险覆盖率对中部和东部地区居民消费升级的影响更显著。随着新型城镇化水平的提高、城镇居民养老保险覆盖率的扩大,将会加快居民消费结构升级。
王云多冯誉婷
关键词:新型城镇化养老保险
具有避障功能的农机自动作业全覆盖路径规划方法
2025年
针对不同尺寸和类型障碍物条件下的农机车辆自动作业全覆盖路径规划问题,提出了静态全覆盖路径规划方法和路径优化方案。根据矩形田块信息、障碍物信息、农机最小转弯半径和机具宽度,自动选定作业方向、作业行距、地头转弯区域和转弯模式等参数;根据障碍物形状、高覆盖率高作业路径比的需求,对算法进行优化调整,以达到更好的作业效果。软件仿真测试结果表明:对有小矩形障碍物的田块,改进后的算法覆盖率提升了0.11%,重复率降低了0.71%;对大矩形障碍物的田块,两种分区路径的覆盖率分别为89.24%和98.08%,重复率分别为3.53%和2.84%。研究结果表明:算法提高了田块的利用率,降低了作业成本,能够有效避开大小障碍物,同时满足高覆盖率和低重复率的田间作业要求。
罗荣浩干熊杨光友
关键词:路径规划算法避障
固定翼无人机巡逻覆盖协同路径规划方法被引量:2
2024年
固定翼无人机(UAV)以其速度快,成本低和可搭载更多设备的优点被广泛应用于侦察任务当中。针对固定翼无人机复杂山地环境协同巡逻覆盖任务中的路径规划问题进行了研究。与以往研究关注无人机实现整个区域的完全覆盖不同,本文关注的重点是多架无人机对任务区域展开协同巡逻,并保证区域内每个地点都能够被无人机连续访问。以往的研究中,无人机的工作模式为分别负责每个子区域的覆盖任务,而本研究中多架无人机在整个巡逻区域中协同工作,能够在提高覆盖效率的基础上更加灵活地处理紧急情况。针对紧急情况下需要在短时间内访问目标区域,设计了一种设置动态目标点的策略和小尺度下的穿梭覆盖算法,保证执行紧急任务的无人机能够在规定时间内到达目标区域的同时兼顾正常的巡逻任务,且对目标区域实现完全覆盖。最后通过一系列的仿真来验证巡逻覆盖协同路径规划算法在侦察覆盖任务中应用的可行性和优化效果。并且在紧急任务中验证动态目标点设置策略相比于以往静态目标点的优越性。
尹洪玉吴宇梁天骄
Deployment optimization for target perpetual coverage in energy harvesting wireless sensor network被引量:2
2024年
Energy limitation of traditional Wireless Sensor Networks(WSNs)greatly confines the network lifetime due to generating and processing massive sensing data with a limited battery.The energy harvesting WSN is a novel network architecture to address the limitation of traditional WSN.However,existing coverage and deployment schemes neglect the environmental correlation of sensor nodes and external energy with respect to physical space.Comprehensively considering the spatial correlation of the environment and the uneven distribution of energy in energy harvesting WSN,we investigate how to deploy a collection of sensor nodes to save the deployment cost while ensuring the target perpetual coverage.The Confident Information Coverage(CIC)model is adopted to formulate the CIC Minimum Deployment Cost Target Perpetual Coverage(CICMTP)problem to minimize the deployed sensor nodes.As the CICMTP is NP-hard,we devise two approximation algorithms named Local Greedy Threshold Algorithm based on CIC(LGTA-CIC)and Overall Greedy Search Algorithm based on CIC(OGSA-CIC).The LGTA-CIC has a low time complexity and the OGSA-CIC has a better approximation rate.Extensive simulation results demonstrate that the OGSA-CIC is able to achieve lower deployment cost and the performance of the proposed algorithms outperforms GRNP,TPNP and EENP algorithms.
Zhenkun JinYixuan GengChenlu ZhuYunzhi XiaXianjun DengLingzhi YiXianlan Wang
Analysis of Mobile and Internet Network Coverage: Propagation of Electromagnetic Waves and Concept of Digital Divide in Burundi
2024年
Mobile and Internet network coverage plays an important role in digital transformation and the exploitation of new services. The evolution of mobile networks from the first generation (1G) to the 5th generation is still a long process. 2G networks have developed the messaging service, which complements the already operational voice service. 2G technology has rapidly progressed to the third generation (3G), incorporating multimedia data transmission techniques. It then progressed to fourth generation (4G) and LTE (Long Term Evolution), increasing the transmission speed to improve 3G. Currently, developed countries have already moved to 5G. In developing countries, including Burundi, a member of the East African Community (ECA) where more than 80% are connected to 2G technologies, 40% are connected to the 3G network and 25% to the 4G network and are not yet connected to the 5G network and then still a process. The objective of this article is to analyze the coverage of 2G, 3G and 4G networks in Burundi. This analysis will make it possible to identify possible deficits in order to reduce the digital divide between connected urban areas and remote rural areas. Furthermore, this analysis will draw the attention of decision-makers to the need to deploy networks and coverage to allow the population to access mobile and Internet services and thus enable the digitalization of the population. Finally, this article shows the level of coverage, the digital divide and an overview of the deployment of base stations (BTS) throughout the country to promote the transformation and digital inclusion of services.
Apollinaire BigirimanaJérémie NdikumagengeSami TabbaneRomeo NibitangaHassan Kibeya
A dual-robot collaborative coverage path planning method for complex surfaces based on a 2.5D grid map
The coverage path planning(CPP) for complex three-dimensional(3 D) surfaces is one of the challenging problems...
Hui GaoQihang ZhangXin Ma
关键词:DUAL-ROBOT
Coverage and Factors Associated with Acceptance and Satisfaction of Seasonal Malaria Chemoprevention in Six Health Zones in Benin
2024年
Introduction: Seasonal malaria chemoprevention (SMC) was adopted in 2019 in two health zones in Benin where malaria transmission is very high. Positive results led to the extension of the intervention to other zones with additional financial support. Annual SMC campaigns from 2021 to 2023 were carried out in all six health zones in the Atacora and Alibori departments. In five years of implementation, various approaches have been developed on the basis of a communication plan facilitating buy-in and acceptance by all stakeholders. The aim of this study was to assess the effective coverage and acceptance of the SMC by their beneficiary populations in 2023. Methods: It was a cross-sectional study with an analytical focus. Data collection took place from November 30 to December 13, 2023. The study population consisted of children under 5 years of age residing in the departments of Atacora and Alibori in northern Benin. A total of 3573 children under 5 years of age were included in the study, and their parents or guardians were interviewed. Results: During the 2023 campaign, 87.7% of targets were reached by SMC administration and 100.00% of children had received at least one dose of SMC by the fourth visit. Effective therapeutic coverage of SMC was 70.55%, with 99.60% in BNK, 69.40% in KGS, 16.20% in MK, 56.10% in 2KP, 92.40% in NBT and 89.60% in TMC. This coverage was statistically related to child and respondent ages (p Conclusion: SMC is a strategy accepted by the population, and the main reasons for non-participation in SMC were dominated by the absence of mothers or babysitters when the agents visited.
Cyriaque AffoukouGeorgia DamienThibaud LègbaOlarewadjou Richard Biaou BoniGéraud PadonouRock AïkponWilliam HoundjoCamille HouetohossouElysé SohizounAurore OgouyemiBadirou Aguèmon
关键词:COVERAGEACCEPTANCEBENIN

相关作者

林锋
作品数:53被引量:93H指数:5
供职机构:四川大学
研究主题:无线传感器网络 COVERAGE SWEEP DT 移动控制
周激流
作品数:420被引量:1,932H指数:22
供职机构:四川大学
研究主题:人脸识别 图像去噪 遗传算法 分数阶微分 边缘检测
李磊
作品数:5被引量:1H指数:1
供职机构:
研究主题:数字填图 地理底图 底图 整饰 COVERAGE
郑锦娜
作品数:9被引量:12H指数:1
供职机构:中国地质调查局天津地质调查中心
研究主题:地质资料 数字填图 地理底图 底图 整饰
郑红波
作品数:76被引量:440H指数:13
供职机构:浙江工业大学计算机科学与技术学院、软件学院
研究主题:GIS 可视化 单幅图像 离散数学 地图符号