悦读·明其义Discovering the charm of travel发现旅行的魅力Travel is one of the most enjoyable experiences one can have.It not only allows us to explore new places but also helps us understand different cultures and...悦读·明其义Discovering the charm of travel发现旅行的魅力Travel is one of the most enjoyable experiences one can have.It not only allows us to explore new places but also helps us understand different cultures and traditions.Whether you are a backpacker or a tourist who prefers comfort,there is always something special waiting to be discovered.展开更多
针对森林资源精准监测的需求,探索背包激光雷达(Light Detection and Ranging,LiDAR)在生产实践中的森林结构参数提取能力,以浙江建德林场为研究区,基于野外调查采集的8块样地背包LiDAR数据,提出一种改进的K-means分层聚类算法进行单木...针对森林资源精准监测的需求,探索背包激光雷达(Light Detection and Ranging,LiDAR)在生产实践中的森林结构参数提取能力,以浙江建德林场为研究区,基于野外调查采集的8块样地背包LiDAR数据,提出一种改进的K-means分层聚类算法进行单木分割,从分割后的单木点云中分别提取胸径、树高、冠幅、树冠投影面积、树冠体积、间隙率等6个单木结构参数,并计算56个点云分层高度特征,利用随机森林方法,构建单木材积估测模型并估测样地蓄积量。结果表明:改进的K-means分层聚类算法综合分割精度F的平均值为0.87,胸径的提取精度为91.26%,树高的提取精度为85.77%;仅用6个单木结构参数作为输入特征变量的单木材积估测模型,模型拟合结果的决定系数(R^(2))为0.89,均方根误差(RMSE)为0.053 m^(3);采用Person相关系数和随机森林特征重要性筛选单木结构参数和分层高度特征后,得到最终的单木材积估测模型,模型拟合结果的R^(2)为0.93,RMSE为0.041 m^(3);利用最优估测模型估算每个样地的蓄积量,平均精度为94.20%。研究结果表明,提出的改进的K-means分层聚类算法能够有效分割单木点云,随机森林方法可以较好地估测单木材积和样地蓄积量,为背包激光雷达在森林资源参数提取方面提供重要的参考价值。展开更多
同步定位与地图构建方法(Simultaneous Localization and Mapping,SLAM)作为环境感知与地图构建的关键技术,具有灵活高效的特点。但是传统的背包式激光雷达存在点云特征不完整和数据噪声大导致的点云分层等问题,导致系统无法进行精确定...同步定位与地图构建方法(Simultaneous Localization and Mapping,SLAM)作为环境感知与地图构建的关键技术,具有灵活高效的特点。但是传统的背包式激光雷达存在点云特征不完整和数据噪声大导致的点云分层等问题,导致系统无法进行精确定位与建图。为了提升自主定位精度,本文采用机器人操作系统搭建自主定位框架,融合激光雷达、惯性测量单元和全球卫星导航系统(Global Navigation Satellite System,GNSS)等多传感器数据,采用基于图优化的SLAM算法实现环境地图构建与系统位姿估计。实验结果表明,相较于传统SLAM算法,改进后的SLAM算法在融合GNSS数据后在轨迹X轴误差上降低了39%,Y轴误差上降低了30%,在平面定位精度上误差降低了73%,同时,在高程定位精度上有63%的提升,在建图精度上有明显提高,为背包测量系统在复杂环境中的应用提供了新思路。展开更多
This paper presents a practice-based research to achieve a deeper understanding of the spatial issues related to backpacker tourism, a booming industry in Budapest. The authors designed six backpacker hostels between ...This paper presents a practice-based research to achieve a deeper understanding of the spatial issues related to backpacker tourism, a booming industry in Budapest. The authors designed six backpacker hostels between 2013 and 2015, and of these, four are presently in operation. Hostels are the main infrastructures within the global network of backpacker tourism. Results from the design process revealed that the creation and operation of hostels are significantly influenced by three issues, namely, informality, density, and adaptability. These issues are negotiated on three interconnected tevels： the city, the building, and the interior. The authors developed an experimental structure for dormitory spaces as a conscious reaction to these issues. This experimental structure is presented and evaluated, and further paths of development are formulated based on the results.展开更多
Purpose-The purpose of this paper is to explore the experience of the weight of a backpack as represented in typical Chinese children’s songs through a kind of phenomenological approach.Design/Approach/Methods-The co...Purpose-The purpose of this paper is to explore the experience of the weight of a backpack as represented in typical Chinese children’s songs through a kind of phenomenological approach.Design/Approach/Methods-The core issue pertaining to Chinese children’s songs about backpacks is how the weight sense of backpacks is generated and developed in the field of song phenomenology.Findings-The“whatness”of a backpack in typical songs has varied over the past six decades,meanwhile,the backpack and its songs conceal not only the secrets of childhood but also those of China’s educational system.Originality/Value-The originality of this paper embodies the unique perspective to provide a new insight into the current scholarship of the micro-politics of song-singing and the weight sense of backpack.展开更多
文摘悦读·明其义Discovering the charm of travel发现旅行的魅力Travel is one of the most enjoyable experiences one can have.It not only allows us to explore new places but also helps us understand different cultures and traditions.Whether you are a backpacker or a tourist who prefers comfort,there is always something special waiting to be discovered.
文摘This paper presents a practice-based research to achieve a deeper understanding of the spatial issues related to backpacker tourism, a booming industry in Budapest. The authors designed six backpacker hostels between 2013 and 2015, and of these, four are presently in operation. Hostels are the main infrastructures within the global network of backpacker tourism. Results from the design process revealed that the creation and operation of hostels are significantly influenced by three issues, namely, informality, density, and adaptability. These issues are negotiated on three interconnected tevels： the city, the building, and the interior. The authors developed an experimental structure for dormitory spaces as a conscious reaction to these issues. This experimental structure is presented and evaluated, and further paths of development are formulated based on the results.
文摘Purpose-The purpose of this paper is to explore the experience of the weight of a backpack as represented in typical Chinese children’s songs through a kind of phenomenological approach.Design/Approach/Methods-The core issue pertaining to Chinese children’s songs about backpacks is how the weight sense of backpacks is generated and developed in the field of song phenomenology.Findings-The“whatness”of a backpack in typical songs has varied over the past six decades,meanwhile,the backpack and its songs conceal not only the secrets of childhood but also those of China’s educational system.Originality/Value-The originality of this paper embodies the unique perspective to provide a new insight into the current scholarship of the micro-politics of song-singing and the weight sense of backpack.
