针对水下对接过程中近距离引导和定位问题,以ARV (Autonomous&Remotely Operated Vehicle)水下对接末端引导应用中对图片特征点的快速准确匹配为目标,提出结合引导灯信息的图片特征点匹配算法。在传统的ORB(Oriented FAST and Rotat...针对水下对接过程中近距离引导和定位问题,以ARV (Autonomous&Remotely Operated Vehicle)水下对接末端引导应用中对图片特征点的快速准确匹配为目标,提出结合引导灯信息的图片特征点匹配算法。在传统的ORB(Oriented FAST and Rotated BRIEF)特征点匹配算法利用关键点和描述子表征特征点的基础上,增加了相对位置信息。在特征点的提取阶段提取关键点、BRIEF描述子和相对位置信息,在匹配阶段同时考虑描述子和相对位置信息的匹配程度,提高了特征点匹配的准确率和鲁棒性。同时,在特征点提取阶段利用引导灯辅助精确计算图片的缩放尺度,使得特征点的提取更加精确、速度更快。通过实验,验证算法的有效性,证明了文中提出的算法提高了图片特征点匹配的准确率和鲁棒性,同时缩短了算法的运算时间,有利于保障定位算法的实时性,从而提升水下对接的成功率。展开更多
Objective:The study was carried out in order to determine the following objectives:(1) To determine the proportion of patients who state achieving or not achieving optimal adherence to antiretroviral therapy(ART) in s...Objective:The study was carried out in order to determine the following objectives:(1) To determine the proportion of patients who state achieving or not achieving optimal adherence to antiretroviral therapy(ART) in selected Care and Treatment Sites in Arusha and Dares Salaam regions in Tanzania.(2) To identify factors such as structural,cultural or disease related contributing to sub-optimal adherence to antiretroviral(ARVs). (3) To assess quality of operating structures and processes for provision of antiretroviral(ARVs) in the selected healthcare facilities.(4) To document suggestions and proposals for improving ART adherence among ARV users.Methods:Data from 7 studied facilities(3 public and 4 private/or faith based) includes 207 interviews from ARV users,28 staff interview staff,26 observations during consultations,8 focus group discussions,10 key informant interviews,and stock checks in 6 facilities.The study design was a cross-sectional using both qualitative and quantitative data collection techniques.Quantitative data were collected by using an adherence tool check list,while qualitative data were obtained using a consultation observation checklist,semi-structured interviews,focus group discussions(FGDs) and key informant interviews.Results:There were slight variations in the quality of operating structures and processes in the two studied regions.However results indicate that ARV adherence in Arusha region was comparatively similar to that of Dares Salaam.The composite adherence for one month in seven facilities was 90%and only 21%of ARV users achieved optimal adherence. Conclusion:The overall mean composite adherence rate of 90%in the two areas surveyed is encouraging. More efforts to improve the quality and processes of operating structures in our study facilities and others in Tanzania are heeded to ensure optimal adherence among the larger group(79%) of ARV users who are currently taking less than the critical 95%of their medications.展开更多
文摘针对水下对接过程中近距离引导和定位问题,以ARV (Autonomous&Remotely Operated Vehicle)水下对接末端引导应用中对图片特征点的快速准确匹配为目标,提出结合引导灯信息的图片特征点匹配算法。在传统的ORB(Oriented FAST and Rotated BRIEF)特征点匹配算法利用关键点和描述子表征特征点的基础上,增加了相对位置信息。在特征点的提取阶段提取关键点、BRIEF描述子和相对位置信息,在匹配阶段同时考虑描述子和相对位置信息的匹配程度,提高了特征点匹配的准确率和鲁棒性。同时,在特征点提取阶段利用引导灯辅助精确计算图片的缩放尺度,使得特征点的提取更加精确、速度更快。通过实验,验证算法的有效性,证明了文中提出的算法提高了图片特征点匹配的准确率和鲁棒性,同时缩短了算法的运算时间,有利于保障定位算法的实时性,从而提升水下对接的成功率。
基金financial support from the World Health Organization
文摘Objective:The study was carried out in order to determine the following objectives:(1) To determine the proportion of patients who state achieving or not achieving optimal adherence to antiretroviral therapy(ART) in selected Care and Treatment Sites in Arusha and Dares Salaam regions in Tanzania.(2) To identify factors such as structural,cultural or disease related contributing to sub-optimal adherence to antiretroviral(ARVs). (3) To assess quality of operating structures and processes for provision of antiretroviral(ARVs) in the selected healthcare facilities.(4) To document suggestions and proposals for improving ART adherence among ARV users.Methods:Data from 7 studied facilities(3 public and 4 private/or faith based) includes 207 interviews from ARV users,28 staff interview staff,26 observations during consultations,8 focus group discussions,10 key informant interviews,and stock checks in 6 facilities.The study design was a cross-sectional using both qualitative and quantitative data collection techniques.Quantitative data were collected by using an adherence tool check list,while qualitative data were obtained using a consultation observation checklist,semi-structured interviews,focus group discussions(FGDs) and key informant interviews.Results:There were slight variations in the quality of operating structures and processes in the two studied regions.However results indicate that ARV adherence in Arusha region was comparatively similar to that of Dares Salaam.The composite adherence for one month in seven facilities was 90%and only 21%of ARV users achieved optimal adherence. Conclusion:The overall mean composite adherence rate of 90%in the two areas surveyed is encouraging. More efforts to improve the quality and processes of operating structures in our study facilities and others in Tanzania are heeded to ensure optimal adherence among the larger group(79%) of ARV users who are currently taking less than the critical 95%of their medications.
