Reading Notes For Week 1

FOA:

1. FOA process of browsing readers involve three steps: asking a question(user information need), constructing an answer(the source of the question, refer to search engine) and assessing the answer(how relevant the answer to the question).
2. Relevance feedback gives the asker an opportunity to provide more information with their reaction to each retrieved document, so researchers should learn more about how to make use of relevant feedback judgments. 

IES:

1. The main components of IR system: User information need drives the search process. Then the user constructs a query to the system. The user interface mediates between the user and the IR system. User's query is processed by a search engine. The search engine accepts queries from user, processes queries and return ranked lists of results.
2. Search engine is to maintain and manipulate an inverted index for a document collection. The index updates is related to the searching efficiency. 
3. Build an IR system requires electronic text formats and the characteristics of the text encode. The content and structure of paper has a impact on indexing and retrieval. 

MIR: 

1. Information Retrieval can be studied from two point of views: computer-centered (build up efficient indexes, process user queries, develop rank algorithms) and human-centered (user behavior, user main needs, understanding affects the operation).
2. The index as a kind of specialized data structures, is very necessary to build for fast searching. It provides fast access to the data and allow speeding up query processing. The most used index structure is an inverted index.
3. The paper also mentioned information retrieval in three generations of library system.(card catalog searching - search functionality - graphical interface) Not only the searching functionality has been added to the query operators, but also the interface and system architecture has been improved too. It means we pay more attention to the human-centered improvement to offer users a better experience.
4. The primary goal of IR system is to retrieve information that is useful to the user, which is opposed to the retrieval of data. IR system users concerned more about retrieving information about a subject than with retrieving data that satisfies a query.