File information, file symbol system, and file carrier recording method
Second, briefly describe the characteristics of medical literature.
(1). A huge number (2). Diversified carrier (3). Multiculturalism (4). Interdisciplinary and decentralized publishing.
(5) Accelerated updating of knowledge and information; (6) Accelerated communication and dissemination; (7) Electronic development trend.
Thirdly, the concept, types and characteristics of literature retrieval are briefly described.
Information retrieval in a broad sense: including two processes of information storage and retrieval, refers to organizing and storing information in a certain way to form a retrieval tool, and finding the required information from the retrieval tool according to the needs of users.
Narrow sense of information retrieval: that is, the process of finding the required information from the retrieval tools or retrieval systems through certain retrieval methods or channels.
Literature retrieval type
(1) is divided into bibliographic retrieval, full-text retrieval and citation retrieval according to the test results.
(2) From the perspective of information retrieval, it can be divided into literature retrieval, data retrieval and fact retrieval.
(3) According to retrieval methods, it can be divided into manual retrieval and computer retrieval.
Characteristics of literature
Appearance characteristics: title, author, source, release date, page number, year, month, type, number, language and other items.
Content characteristics: such as subject words, classification number, class name, abstract, etc.
Fourthly, the evaluation factors of literature retrieval system are briefly described.
(1) Timeliness of reporting information
② Accuracy of reporting information
③ Perfection of index system.
④ Depth of information indexing
⑤ Accuracy and recall rate
Content structure of document retrieval system;
The (1) file is part of the database. According to its arrangement structure and function, it can be divided into embedded document, inverse document and help navigation. Among them, the embedded document is the main document in the database and a collection of a large number of records.
② A record is a complete information unit in the database, which consists of a series of fields. A record represents a document.
(3) Fields are the names and contents of various items in the recorded literature, and the contents of various marks describing the internal and external characteristics of the literature. Each field has a corresponding field idenTIfier, such as title (ti), AUthor (au), ADdress (ad), SOurce (so), subject word (MeSH),
Keywords (KW), characteristic words (TG), year of publication (PY), language (la), abstract (ab) and so on.
④ Database → Document → Record → Field (from largest to smallest)
5. What are recall and precision, and what is the relationship between them?
Recall rate (R)= the total amount of/related information detected in retrieval tools × 100%.
Accuracy (P)= relevant information detected/total information detected × 100%.
The relationship between them: the higher the recall rate, the lower the accuracy; Conversely, the higher the accuracy, the lower the recall rate; The two can only be improved relatively, and it is impossible to reach 100% at the same time.
Try to describe the types of literature information.
1, according to the form of document information: text document, video document, sound document and digital document.
2, according to the literature information publishing type:
Books, patent documents, standard documents, periodicals, dissertations, product sample instructions.
Scientific and technological reports, technical archives, conference documents and government publications
3. According to the carrier form of literature information, it can be divided into printing type, miniature type, audio-visual type and electronic type.
4, according to the processing degree of literature information:
① Zero documents: letters, manuscripts, experimental data, observation records, notes, internal documents, etc.
Features: the content is novel, but immature and difficult to query.
② Main documents: periodical papers, patent specifications, conference papers, dissertations, scientific and technological reports, etc.
Features: The content is novel and detailed, and it is the main source and retrieval object of literature information, but its large quantity, dispersion and disorder bring inconvenience to its retrieval and utilization.
③ Secondary literature: catalogue, index and abstract.
Features: Reportability and retrieval, whose main function is to provide clues to find literature information, so it is also called retrieval tool.
④ Three documents: review, progress, yearbook, encyclopedia, etc.
Seven, try to describe the concept and characteristics of electronic literature resources.
Features:: 1. Changes in storage media and communication forms.
2. The forms of information are diversified.
3. The types of literature resources are diversified.
4. Multi-level information service function
5. The update speed is fast and the timeliness is strong.
6. There is a retrieval system or function.
7. Search access is not limited by time and space.
Eight, try to describe the types of medical electronic literature resources.
1. Reference database
2. Full-text database
3. Facts and figures database
4. E-books
9. What is a retrieval language? What is the logical relationship between retrieval language and feeling?
Retrieval language is a special language compiled by hand to meet the needs of document information processing, storage and retrieval.
It is a series of concept identification systems, which are used to describe the characteristics of information sources and search.
① Equivalence relation
② subordination
③ correlation
10. Briefly describe the types of retrieval languages.
XI。 How many theme languages are there? Briefly describe its characteristics.
① grid
② Thesaurus of Traditional Chinese Medicine in China.
③ Complete medical language system.
Twelve, try to describe the basic methods, ways and steps of literature retrieval.
Document retrieval approach: 1. Classification method 2. Thematic method 3. Author's method 4. The number is close to 5. Other methods.
Basic methods of literature retrieval;
1. Boolean logic operator combination search: AND and, OR or, NOT not.
2. Position operator: with is in the same field and near is in the same sentence.
3. Limited field retrieval: ① search term in field identifier ② field identifier = search term.
4. Blocking search: infinite word breakers *: instead of a few characters.
Limited wildcards? : instead of any character or 0 characters.
Any wildcard%: Replace any character.
5. Priority search: ① Parentheses are priority search.
② The search order without brackets is: Not, near, with, and, or.
6. Limited year search: 1998 in py, py= 1998, py.
7. Horizontal retrieval: in the retrieval process, select the words or phrases that users need from the fields of the displayed records.
As a search term, add it directly to the input box for search.
Features of horizontal retrieval: Any field with preliminary results in the record has something you need to check.
Any word or phrase can be searched as a search term. Among them, abstract and grid fields are the most useful.
You don't need to enter a search term for horizontal search.
8. Secondary retrieval: refers to taking various restrictive measures to narrow or expand the test results on the basis of previous test results.
The second retrieval can be carried out many times until satisfactory results are detected.
Thirteen, try to describe the methods and steps of computer literature retrieval.
Ways to expand search results:
1, using superordinate words or superordinate classification numbers for extended retrieval;
2. Add synonyms or synonyms and match them with OR;
3. Using word segmentation retrieval technology;
4. Reduce the combination of sum;
5. Reduce or cancel some limited searches.
Ways to narrow the search results:
1, select specific keywords or conduct secondary search;
2. Add and connect to further define the theme concept;
3. use not to limit the search;
4. Add a subtitle;
5. Use limited search or search in the same sentence and field.