Orientation update message filtering is an important issue in collaborativevirtual environments (CVEs). Dead-reckoning (DR) is a known effective mechanism for update messagefiltering. Yet, previous dead-reckoning tech...Orientation update message filtering is an important issue in collaborativevirtual environments (CVEs). Dead-reckoning (DR) is a known effective mechanism for update messagefiltering. Yet, previous dead-reckoning techniques mainly focus on the update message filtering forpositions. The existing orientation dead-reckoning algorithms are based on fixed threshold values.The drawbacks of fixed thresholding for orientations (FTO) are discussed in this paper. We propose avariable thresholding for orientations (VTO) based on average recent angular velocity. The mainadvantage of the proposed VTO is the ability of balancing the number of state update messages andshift frequency of direction and speed of rotation.展开更多
【研究目的】为全面提升吉林省地质环境信息服务能力,解决地质环境数据存储分散、缺乏数据共享服务机制和综合分析能力弱等诸多问题,采用“大综合、大集成、大融合”的理念,研发了吉林省地质环境信息数据共享和服务平台。【研究方法】...【研究目的】为全面提升吉林省地质环境信息服务能力,解决地质环境数据存储分散、缺乏数据共享服务机制和综合分析能力弱等诸多问题,采用“大综合、大集成、大融合”的理念,研发了吉林省地质环境信息数据共享和服务平台。【研究方法】平台以面向服务架构(Service-Oriented Architecture,SOA)为总体框架,在.Net、地理信息系统(Geographic Information System,GIS)、虚拟现实(Virtual Reality,VR)、数据库等技术的支撑下,基于哈希格网改进的椭球四叉树空间索引和切片数据库构建技术、SOA和WCF地质环境大数据共享与服务技术、C/S和B/S模式信息系统集成等关键技术综合研发而成。【研究结果】平台高度整合集成地质环境调查监测和综合评价数据,规范化地质环境数据从生产、汇交、整合、管理、更新、共享到应用的全过程,采用工作系统、服务系统、科普系统的个性化功能提升地质环境数据服务的专业性与普适性,并基于VR技术和地质环境交叉研究提升地质环境数据应用的广度与深度。【结论】平台较大程度提升了地质环境成果转化的科技创新能力和现代化水平,对精准服务地质环境调查、监测、保护和地质灾害防治具有重要意义。展开更多
The first component of a building implemented in a virtual prototype concerning the management of a building is a lighting system. It was applied in a study case. The interactive application allows the examination of ...The first component of a building implemented in a virtual prototype concerning the management of a building is a lighting system. It was applied in a study case. The interactive application allows the examination of the physical model, visualizing, for each element modeled in three-dimensions （3D） and linked to a database, the corresponding technical information concerned with the use of the material, calculated for different points in time during their life. The control of a lamp stock, the constant updating of lifetime information and the planning of periodical local inspections are attended on the prototype. This is an important mean of cooperation between collaborators involved in the building management.展开更多
文摘Orientation update message filtering is an important issue in collaborativevirtual environments (CVEs). Dead-reckoning (DR) is a known effective mechanism for update messagefiltering. Yet, previous dead-reckoning techniques mainly focus on the update message filtering forpositions. The existing orientation dead-reckoning algorithms are based on fixed threshold values.The drawbacks of fixed thresholding for orientations (FTO) are discussed in this paper. We propose avariable thresholding for orientations (VTO) based on average recent angular velocity. The mainadvantage of the proposed VTO is the ability of balancing the number of state update messages andshift frequency of direction and speed of rotation.
文摘【研究目的】为全面提升吉林省地质环境信息服务能力,解决地质环境数据存储分散、缺乏数据共享服务机制和综合分析能力弱等诸多问题,采用“大综合、大集成、大融合”的理念,研发了吉林省地质环境信息数据共享和服务平台。【研究方法】平台以面向服务架构(Service-Oriented Architecture,SOA)为总体框架,在.Net、地理信息系统(Geographic Information System,GIS)、虚拟现实(Virtual Reality,VR)、数据库等技术的支撑下,基于哈希格网改进的椭球四叉树空间索引和切片数据库构建技术、SOA和WCF地质环境大数据共享与服务技术、C/S和B/S模式信息系统集成等关键技术综合研发而成。【研究结果】平台高度整合集成地质环境调查监测和综合评价数据,规范化地质环境数据从生产、汇交、整合、管理、更新、共享到应用的全过程,采用工作系统、服务系统、科普系统的个性化功能提升地质环境数据服务的专业性与普适性,并基于VR技术和地质环境交叉研究提升地质环境数据应用的广度与深度。【结论】平台较大程度提升了地质环境成果转化的科技创新能力和现代化水平,对精准服务地质环境调查、监测、保护和地质灾害防治具有重要意义。
文摘The first component of a building implemented in a virtual prototype concerning the management of a building is a lighting system. It was applied in a study case. The interactive application allows the examination of the physical model, visualizing, for each element modeled in three-dimensions （3D） and linked to a database, the corresponding technical information concerned with the use of the material, calculated for different points in time during their life. The control of a lamp stock, the constant updating of lifetime information and the planning of periodical local inspections are attended on the prototype. This is an important mean of cooperation between collaborators involved in the building management.
