As an important part of National Digital Library(NDL),the National Digital Library Project(NDLP),which was launched in 2005,has attracted wide attention of the society in general.This paper introduces the general situ...As an important part of National Digital Library(NDL),the National Digital Library Project(NDLP),which was launched in 2005,has attracted wide attention of the society in general.This paper introduces the general situation of the project from the following aspects,namely,the characteristics,objectives and contents.It also expounds on the basic ideas and the overall structure of the project and gives an introduction to the design of its basic platform,its application platform,its business management system and its standardization control system.In this paper,the digital resources construction and service delivery of the National Library of China(NLC)are introduced to cover both its present operation as well as those in conjunction with the opening of its new library building during its second-phase of library development.Finally,the most important and difficult point in the construction of the National Digital Library Project is analyzed from the following four perspectives:1)The long-term preservation of digital resources;2)the construction of knowledge organization system;3)the organic integration of the digital library and the traditional library;and 4)the risk of project management and system integration.展开更多
In a very large digital library that support computer aided collaborative design, an indexing process is crucial whenever the retrieval process has to select among many possible designs. In this paper, we address the...In a very large digital library that support computer aided collaborative design, an indexing process is crucial whenever the retrieval process has to select among many possible designs. In this paper, we address the problem of retrieving important design and engineering information by structural indexing. A design is represented by a model dependency graph, therefor, the indexing problem is to determine whether a graph is present or absent in a database of model dependency graphs. we present a novel graph indexing method using polynomial characterization of a model dependency graph and on hashing. Such an approach is able to create an high efficient 3D solid digital library for retrieving and extracting solid geometric model and engineering information.展开更多
The research takes three fundamental Internet Academic Journals (IAJ), which are China National Knowledge Infrastructure (CNKI), Chongqing VIP Information Co., Ltd. (VIP) and Beijing Wanfang Data Co., Ltd. (WFD), as s...The research takes three fundamental Internet Academic Journals (IAJ), which are China National Knowledge Infrastructure (CNKI), Chongqing VIP Information Co., Ltd. (VIP) and Beijing Wanfang Data Co., Ltd. (WFD), as subjects to discuss digital publishing mechanism innovations for China’s science information communication system. After introducing main Internet environment, comparing journal characteristics, and explaining publishing & operation modes of the IAJs, the paper analyses important issues such as redundant contents, digitalization issues, illegal journals, standards construction, copyright and benefit distribution. By learning from research practices and open access, a new benefit distribution and copyright management mode based on the Third Party Agency (TPA) is proposed. Future IAJs operation modes are also discussed from the view of scientific research innovation and state of the art platform construction.展开更多
针对线路级铁路桥梁三维设计交底现有实现方法存在时间人力成本高、模型兼容性差、设计信息缺失等问题,本文提出一种三维设计交底快速实现方法。首先创建与桥梁设计系统相关联的固定数据结构设计表单,通过解析表单快速获取桥梁设计数据...针对线路级铁路桥梁三维设计交底现有实现方法存在时间人力成本高、模型兼容性差、设计信息缺失等问题,本文提出一种三维设计交底快速实现方法。首先创建与桥梁设计系统相关联的固定数据结构设计表单,通过解析表单快速获取桥梁设计数据;然后基于AnyCAD定义参数化构件单元,搭建参数化构件库,通过建立构件与设计参数之间的映射匹配关系,实现自动批量参数化建模;提出构件定位参数计算方法,实现模型沿线位自动定位装配;模型成果与GIS(Geographic Information System)平台兼容性较好且自动修正坐标系转换误差,实现自动批量导入。结果表明,在实际工程中,采用该方法后模型构建效率可达每人150 km/d,且桥梁数字模型与设计参数一一绑定,能为线路级铁路桥梁三维设计交底提供了高效解决方案。展开更多
基金supported by the Ministry of Education of P.R.China(Grant No.07JJD870221)
文摘As an important part of National Digital Library(NDL),the National Digital Library Project(NDLP),which was launched in 2005,has attracted wide attention of the society in general.This paper introduces the general situation of the project from the following aspects,namely,the characteristics,objectives and contents.It also expounds on the basic ideas and the overall structure of the project and gives an introduction to the design of its basic platform,its application platform,its business management system and its standardization control system.In this paper,the digital resources construction and service delivery of the National Library of China(NLC)are introduced to cover both its present operation as well as those in conjunction with the opening of its new library building during its second-phase of library development.Finally,the most important and difficult point in the construction of the National Digital Library Project is analyzed from the following four perspectives:1)The long-term preservation of digital resources;2)the construction of knowledge organization system;3)the organic integration of the digital library and the traditional library;and 4)the risk of project management and system integration.
文摘In a very large digital library that support computer aided collaborative design, an indexing process is crucial whenever the retrieval process has to select among many possible designs. In this paper, we address the problem of retrieving important design and engineering information by structural indexing. A design is represented by a model dependency graph, therefor, the indexing problem is to determine whether a graph is present or absent in a database of model dependency graphs. we present a novel graph indexing method using polynomial characterization of a model dependency graph and on hashing. Such an approach is able to create an high efficient 3D solid digital library for retrieving and extracting solid geometric model and engineering information.
文摘The research takes three fundamental Internet Academic Journals (IAJ), which are China National Knowledge Infrastructure (CNKI), Chongqing VIP Information Co., Ltd. (VIP) and Beijing Wanfang Data Co., Ltd. (WFD), as subjects to discuss digital publishing mechanism innovations for China’s science information communication system. After introducing main Internet environment, comparing journal characteristics, and explaining publishing & operation modes of the IAJs, the paper analyses important issues such as redundant contents, digitalization issues, illegal journals, standards construction, copyright and benefit distribution. By learning from research practices and open access, a new benefit distribution and copyright management mode based on the Third Party Agency (TPA) is proposed. Future IAJs operation modes are also discussed from the view of scientific research innovation and state of the art platform construction.
文摘针对线路级铁路桥梁三维设计交底现有实现方法存在时间人力成本高、模型兼容性差、设计信息缺失等问题,本文提出一种三维设计交底快速实现方法。首先创建与桥梁设计系统相关联的固定数据结构设计表单,通过解析表单快速获取桥梁设计数据;然后基于AnyCAD定义参数化构件单元,搭建参数化构件库,通过建立构件与设计参数之间的映射匹配关系,实现自动批量参数化建模;提出构件定位参数计算方法,实现模型沿线位自动定位装配;模型成果与GIS(Geographic Information System)平台兼容性较好且自动修正坐标系转换误差,实现自动批量导入。结果表明,在实际工程中,采用该方法后模型构建效率可达每人150 km/d,且桥梁数字模型与设计参数一一绑定,能为线路级铁路桥梁三维设计交底提供了高效解决方案。
