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最近,万方数据推出了“信息溯源”光盘第二版,有效地弥补了网络搜索引擎的缺陷,大大降低了人们在网上获取有效信息的难度。当今,网络信息的丰富性和获取的便捷性,使得上网查询信息成为众多信息需求者的首选途径。然而,网络信息资源的膨胀同时也使信息垃圾、信息噪声泛滥,尤其是通过网络搜索引擎查询专业信息,查准率和查全率都不理想,给信
Recently, Wanfang Data launched the second edition of its “Information Tracing” CD-ROM, effectively making up for the shortcomings of Web search engines and greatly reducing the difficulty of obtaining valid information online. Nowadays, the richness of network information and the convenience of access make it possible for Internet information to be the preferred way for many information consumers. However, the expansion of online information resources also makes information garbage and information noise flooding. In particular, it is not ideal to search professional information through web search engines, and the accuracy and recall rate are not satisfactory.