Reasersh On Supervising The Cyberspace Public Opinion Based On The Search Engine Index Analysis

As the high speed development of internet in the global wide, internet has become one of the most important technique for people to get information and public opinion. However, since the internet has the characteristics of open and virtual, the Cyberspace Public Opinion effects more broadly, spread faster and erupt more suddenly than the traditional public opinion. Moreover, various kinds of unhealthy and seditious information exist everywhere on Internet, which would lead to irrational judgment and instability of society. Therefore, it is essential to supervise and control the cyberspace public opinion effectively.Different from the traditional research on public opinion which targets limited and specific websites or information sources which are supervised partially, this thesis targets the index of search engine, combining with Index Analysis technology to realize the analyzing and supervising the cyberspace public opinion in index of search engine. Accordingly, lead a preliminary research on supervising the cyberspace public opinion macroscopically. This thesis firstly discussed the theory of search engine and index structure. Then the analysis and conclusion of existing technique and theory in Index Analysis are made. And in the meantime, the shortcoming of Yossef-Gurevich Algorithm of Index Analysis emphasized. Based on the situation of our country and motive of public opinion supervision, this thesis made some improvement to Yossef-Gurevich Algorithm, which on one hand, by constructing the Chinese Query Dictionary, and experimenting the best trial times of Monte Carlo Simulation, made the Index Analysis technology be effectively applied to the Chinese index. On the other hand, by filtering the unrelated results of search engine, the effect to the index can be eliminated so that the accuracy of public opinion supervision and analysis can be enhanced.For supervising the public opinion, this thesis on the base of Index Analysis, combining with Web Denoise technology, realized supervising some specific public opinion on purpose in the index of search engine, and concluded the trends and distributions of specific public opinion, thereby, a reference of public opinion macroscopical supervision can be provided.