The impact of a 360° virtual tour on the reduction of psychological stress caused by COVID-19

The continuous spread of the COVID-19 pandemic is causing people to feel anxiety and stress. This study constructs a four-layer research model to examine how a 360° virtual tour can reduce people's psychological stress through two types of presence (the sense of presence and telepresence) and affective-motivational states (enjoyment and involvement) in this extraordinary period of the COVID-19 pandemic. In order to test the moderating effect of involvement, partial least squares (PLS) analysis is employed to analyse valid data collected from 235 individuals. The results of this study indicate that telepresence has a higher impact in generating affective-motivational states than the sense of presence. Among the factors, enjoyment shows the highest effect on satisfaction with the 360° virtual tour experience and stress reduction; involvement moderates the effect of telepresence on satisfaction with the 360° virtual tour experience. This study also contributes to virtual reality research by distinguishing the concepts of ‘sense of presence’ and ‘telepresence’ as well as demonstrating the mechanisms whereby virtual reality technology influences people's psychological well-being. Timely recommendations are provided for people in order to reduce psychological stress during and after COVID-19 pandemic.     

An improvement for the McGill University Random Number Package

This paper documents and provides code for two new entry points which increase the flexibility of the McGill University Random Number Package. With these additions the user can access internal locations containing the pseudo-random integers that control the random sequences produced by the generator. A detailed example of the use of the new entry points is provided. Finally, some comments about the documentation of random number generators are made.     

基于地理信息的电力线全景图像信息融合方法

提出一种基于地理信息的电力线全景图像拼接方法。首先利用自动巡检机器人同步采集电力线的可见光图像和红外图像,采用尺度不变特征变换(SIFT)特征匹配算法分别拼接成全景图。其中红外全景图用于电力线的故障检测,可见光全景图对故障作进一步的可视化辅助检测,实现了故障信息、GPS信息和全景图像的融合,能够较精确地确定故障处的实际地理位置,提高了对电力线的维修效率。     

鱼眼图像及图像拼接在旅游网络推广中的应用

本文结合旅游项目网络推广的实际需求,以两鱼眼图像为例,介绍一种基于鱼眼图像的方法,实现360°全景图像技术在旅游网络推广领域的应用。该方法包括图像采集、图像校正、图像拼接、图像融合及图像的网络播放等主要环节。     

Using 360‐degree videos in teacher education to improve preservice teachers' professional interpersonal vision

Noticing and interpreting classroom events (professional vision) is an important element of preservice teachers' (PSTs) interpersonal competence. This paper presents a mixed‐method study about a classroom simulation using 360‐degree videos combined with theoretical lectures in teacher education, intended to improve PSTs' interpretations of noticed events. Furthermore, this study examined how PSTs evaluate technological and educational affordances of 360‐degree videos. Results indicate that participating PSTs improved in noticing classroom events and in applying a more theory‐based terminology to describe these events. PSTs perceived observing other teachers teach as an educational affordance for mastering theory and for developing insights about interpersonal teacher behaviour. Concerning technological affordances, mainly physical discomforts and technical hindrances, was reported by PSTs. The results of this study imply that 360‐degree videos can be useful for teacher education to improve PSTs' interpretation of noticed events.     

基于单应性矩阵和内容保护变形的图像拼接

针对图像拼接技术进行全景图像融合时出现瑕疵、畸变且不能保护图像内容的现象,提出了一种基于单应性矩阵和内容保护变形的图像拼接算法。该算法首先选用单应性矩阵模型,给定种子特征点,递增地对其相邻特征点进行分组;然后使用较合适的阈值进行分组得到尽可能多的特征点;最后对于由单应性矩阵产生图像的内容发生变化的现象,通过内容保护变形算法来解决,使拼接后的图像不会出现物体畸变、瑕疵的现象。实验表明,本文算法解决了在光照条件下出现模糊、图像内容发生变化的现象,有效地提高图像配准的效率,能够达到无缝拼接、无视差的全景效果图。     

基于三维全景技术的高速公路设施采集与管理

为解决当前高速公路设施采集与管理中存在的采集方式落后、危险性高、易出错、效率低等难题,针对高速公路的特点,从高速公路设施数据组织、基于三维全景技术的高速公路设施普查方法、车载全景影像采集平台的航向和俯仰角速度获取、高精度地面全景影像采集车载设备精确定位、三维全景影像中空间数据的采集定位、线性参照管理方法等方面进行关键技术研究,建立了高速公路设施管理整套解决方案。本文研究成果成功应用到了重庆市高速公路设施的采集与管理中,辅助进行科学决策,有效提升了高速公路服务水平。     

虚拟全景在建筑教学中的应用研究与实现

虚拟全景是一种基于图象的虚拟现实技术,与目前广泛采用的建模方法不同,虚拟全景成本低,制作简单,且数据量少,可以实现逼真流畅的全景漫游。本文通过建筑网站中的设计实例,说明了虚拟全景的详细制作流程,并介绍了采用PTViewerjavaapplet技术将全景发布到互联网的简单方法。通过实际应用表明了虚拟全景技术在建筑教学、设计等领域有广泛的应用前景。     

合金元素偏聚夹杂对针状铁素体管线钢焊接热影响区氢鼓泡的影响

L360MCS针状铁素体管线钢焊接接头经HIC试验后热影响区产生大量的氢鼓泡.剥开氢鼓泡的上半部分,露出氢鼓泡的断口形貌.用扫描电镜和EDS分析氢鼓泡的上下两部分.结果表明,在绝大多数氢鼓泡的形核区存在偏聚的颗粒状Ca,Al元素夹杂物.分析认为H原子进入基体后,夹杂物周围的内应力和空位浓度升高是形成氢鼓泡裂纹形核空腔的主要原因,活性H原子在空腔内复合成H2分子导致空腔中活性H原子浓度低于基体中氢原子浓度是氢高压形成的重要原因.     

国有煤炭企业中层管理人员绩效评价机制研究

分析了国有煤炭企业在中层管理人员绩效评价环节上所存在的问题及原因,并以C公司为例,综合采用360°绩效评价法、关键绩效指标考核法和目标管理法设计了国有煤炭企业中层管理人员绩效评价机制。