一种在轨海上多运动舰船目标检测和跟踪方法

传统遥感卫星图像处理采用在地面进行目标检测和跟踪处理的模式,卫星将拍摄到的图像数据下传至地面数据处理中心,由地面数据处理系统对接收到的遥感图像数据进行目标检测和跟踪。然而,随着遥感图像分辨率的不断提高,需要下传的数据量增大,导致星地数据传输的时间大大增加,最终造成目标检测和跟踪的时效性降低。针对上述问题,提出一种基于多特征量判别的Canny边缘检测和联合概率数据关联的在轨海上多运动舰船目标检测和跟踪方法。将该方法利用中国科学院微小卫星创新研究院的高分微纳卫星实测数据在模拟星载的嵌入式开发平台上进行验证,结果表明该方法能够在轨对海上多运动舰船目标进行快速、准确的检测和跟踪。     

数据库营销及其在旅游企业的应用

随着旅游市场竞争的不断加剧,旅游企业必须有强大的营销手段才能生存和发展。介绍了数据库营销的概况和数据挖掘的常用技术,讨论了旅游企业实施数据库营销的必要性及应注意的问题。     

论李贽的人才观

李贽是我国古代一位杰出的思想家,他的思想对后世产生过重要影响.李贽对人才的标准、识人、用人等几个方面都有论述,他将"总足办事"作为衡量人才的主要标准.他不拘一格选用人才的思想有其合理性,对今天识人、用人仍不失参考价值.     

Understanding the track and field sprint start through a functional analysis of the external force features which contribute to higher levels of block phase performance

This study aimed to identify the continuous ground reaction force (GRF) features which contribute to higher levels of block phase performance. Twenty-three sprint-trained athletes completed starts from their preferred settings during which GRFs were recorded separately under each block. Continuous features of the magnitude and direction of the resultant GRF signals which explained 90% of the variation between the sprinters were identified. Each sprinter’s coefficient score for these continuous features was then input to a linear regression model to predict block phase performance (normalised external power). Four significant (p < 0.05) predictor features associated with GRF magnitude were identified; there were none associated with GRF direction. A feature associated with greater rear block GRF magnitudes from the onset of the push was the most important predictor (β = 1.185), followed by greater front block GRF magnitudes for the final three-quarters of the push (β = 0.791). Features which included a later rear block exit (β = 0.254) and greater front leg GRF magnitudes during the mid-push phase (β = 0.224) were also significant predictors. Sprint practitioners are encouraged, where possible, to consider the continuous magnitude of the GRFs produced throughout the block phase in addition to selected discrete values.     

Comfort assessment of running footwear: Does assessment type affect inter-session reliability?

Assessing comfort of running footwear reliably is challenging. The purpose of this study was to compare the intra-rater reliability between different assessment types, to calculate intra-individual reliability scores and to evaluate the effect of rater selection based on individual reliability scores on group level reliability. Three assessment types: ranking, Visual Analogue Scale (VAS), and Likert Scale (LS) were provided twice in six separate sessions among 30 participants, who assessed comfort of five shoes after treadmill running. Spearman's rho provided an evaluation of inter-session relative reliability and typical error as a measure of absolute reliability for each assessment type. Ranking (r?=?0.70, 95% confidence interval [CI] 0.61–0.78) yielded the highest relative reliability for overall comfort, followed by VAS (r?=?0.67, 95% CI 0.56–0.75) and LS (r?=?0.63, 95% CI 0.52–0.72), with large-scale overlaps of CIs between assessment types. The same order of assessment types was found for the percentage of reliable raters (r?≥?0.7) with 60% in ranking scale, 47% in VAS and 37% in LS. Forming subgroups corresponding to the intra-individual reliability substantially increased group level reliabilities. Based on measures of relative reliability, an extreme reduction in resolution as provided by the ranking from pairwise comparisons seems to be a valuable tool in footwear comfort assessments if assessment time is of minor importance. No preference can be provided for the two investigated rating scales. Besides the assessment type, a selection of the best raters in additional reliability checks seems to be a prerequisite for further comfort-related studies.     

科学数据共享FAIR原则:背景、内容及实践

[目的/意义]FAIR原则已经成为科学数据管理的国际准则,研究该原则的理念内涵将有助于我国科学数据管理工作的布局与实践。[方法/过程]基于文献调研和网络调研,首先从时代特性角度分析了FAIR原则的产生背景;然后透过关键语词详细解析了可发现、可访问、可互操作、可重用4项子原则的具体内容;最后从学术会议、研究成果、科学计划、数据出版四个方面介绍了FAIR原则的研究与实践进展。[结果/结论]文章认为,数据资源持续积累、科学研究范式变革、数据共享全球行动为FAIR原则产生奠定了背景,4项子原则及其15条具体原则层层递进,共同描绘了FAIR体系。未来的科学数据共享系统将朝着融合化、智能化、生态化方向发展。     

海外华人的语言生活与华文教学的内容、方法和目标

海外华人的语言生活尤其是其中的方言因素对华文教学之内容、方法与目标产生直接的影响。在确立华文教学之内容、方法与目标时,应对海外华人的语言生活予以足够的重视,不仅要从世界汉语教学大趋势的角度考虑,也要兼顾华人社会沟通的需要、历史文化传承的需要,并遵循语言发展与传播的基本规律。     

县级土地资源可持续利用评价指标体系与评价方法

该文从县域经济重要性的角度分析了县级尺度土地资源可持续利用、管理和规划的重要意义。以土地资源可持续利用的基本原理为基础，采用“多指标集合度量法”的概念和模型，构建了县级尺度土地资源可持续利用指标体系框架，具体包括目标层、准则层、因子层和指标层等不同层次，目标层反映土地资源可持续利用总体目标，准则层反映土地可持续利用的5个准则，即生产性、安全性、保护性、经济可行性和社会可接受性。以江苏锡山市为例，采用综合指数方法与单指标多角度评价方法相结合的方法，侧重于对每项指标的多角度分析和土地资源可持续利用变化过程的评价，评价了锡山市土地资源可持续利用状况，寻找目前与将来影响锡山市土地资源可持续利用的存在问题，提出了实现可持续性土地利用与管理目标的解决途径。     

基于 GML 的多源异构数据交换技术研究

以滇池（湖泊）流域生态建设与生态文化数字化信息系统开发为背景,在研究多源异构数据交换关键技术的基础上,利用标准的 GML 数据格式对 SHP 和 MIF 两种不同格式的空间数据进行集成应用,解决了传统地理信息系统存在交互性差的问题,从而实现对空间数据的互操作。实验验证表明,GML 空间数据格式能准确表达两种异构数据的集成结果,从而确定 MIF 和 SHP 两种数据格式成功集成到 GML 框架。     

数据场体视化方法综述

数据场体视化使人们可以从一幅图象里感受到数据整体的信息．本文研究了大量体视化方面文献后,总结了体视化的研究方法,并提出了当前的研究热点及今后的研究方向．