Information: information is the reflection of the way things exist, the state of motion and their characteristics, and it is the signal and news sent by things.
Characteristics of information: carrier dependence, wireless enjoyment, inexhaustible development and value-added application timeliness are universal
Knowledge: knowledge is the sublimation and result of information, and systematic and theoretical information is called knowledge.
Literature: knowledge recorded in a certain way on a certain carrier is called literature.
Information source: the source of information obtained by individuals to meet the needs of information is called information source.
Information source type: personal information source. Organization information source. Physical information source. Literature information source. Five types of electronic information sources.
Information resources: that is, information as resources. Including information producers, information and information technology.
Literature information sources are divided into: books, periodicals, dissertations, scientific reports, patent documents, standard documents, product samples, conference documents and government publications.
Zero-time literature: the most original literature that has not been published or entered social communication.
Primary literature: various published or published documents such as composition reports based on the author's own achievements.
Secondary documents: the documents that have been processed by certain retrieval tools are screened according to a specific purpose.
Third literature: according to the clues provided by the second literature, the contents of a large number of first literature are selected and re-published after screening, classification, synthesis and concentration.
Information literacy: the ability to recognize when information is needed and to effectively search, evaluate and use the required information.
Medical information literacy includes: information consciousness, information knowledge, information ability and information morality.
Information retrieval: Information retrieval includes two processes of information storage and information acquisition.
Types of information retrieval: literature retrieval, fact retrieval and data retrieval.
Information retrieval principle: it is to establish various retrieval systems by collecting, processing, organizing and storing a large number of scattered and disorderly literature information. And through a certain amount of methods and means, the characteristics used in the two processes of storage and retrieval are consistent, so as to effectively obtain and utilize information sources.
chapter two
A database consists of document records and fields.
Ways of information retrieval: classification, topic, keyword, author, title and number.
Information retrieval technology: Boolean logic retrieval, truncation retrieval, location retrieval and limited field retrieval.
Information retrieval strategy: first, analyze the retrieval subject, understand the purpose and requirements; second, select the retrieval system and database; third, select the retrieval path; fourth, compile the retrieval expression, adjust the retrieval strategy; fifth, obtain the original literature.
Basic requirements of information retrieval: comprehensive, accurate and fast.
Recall and precision are two important indexes to evaluate the retrieval effect.
Measures to improve retrieval effect;
Precision ratio: indicates the proportion of relevant documents in the detected documents. Recall ratio: refers to the ratio of the relevant documents detected to the relevant documents actually stored in all the document databases.
1. Measures to improve recall ratio: 1 Try to combine keywords with keywords for retrieval. 2. When searching for keywords, expAND retrieval and use all sub-keywords for retrieval. 3. When searching for categories, expand retrieval and search for all sub-keywords. 4. Delete an unimportant concept group and reduce AND operation. 5. Use synonyms for OR operation. 6. Use cut-off retrieval.
2. Measures to improve the precision rate: 1 Use stANDardized keywords and sub-topic phrases for retrieval, use less or no free words, use weighted methods to limit the main concept keyword fields for retrieval, add concept groups, use AND operators for connection, use NOT operators to exclude irrelevant concepts, use NOT operators to limit retrieval fields such as literature types, languages, authors' titles, etc., and adjust and relax position operators.
3 the role of information retrieval
Information retrieval is the main content of information literacy education.
Information retrieval is the basic skill of innovative talents.
Information retrieval is an important link in scientific research.
Information retrieval is an important way to develop information resources.
Information retrieval is an important prerequisite for scientific decision-making.
1 1 word tree and its branches in the sub-topic tree table (***7 1 piece)
/anatomy & Histology anatomy and histology
/blood supply/blood supply
/cytology/cytology
/pathology/pathology
/ultrastructures/ultrastructure
/embryology/embryology
/abnormalities/Deformities
/innervation/innervation
/analysis analysis
/blood/blood
/cerebrospinal fluid/Cerebrospinal fluid
/urine/urine
/isolation & Purification/separation and purification
/chemistry chemistry
/analogs & Derivatives/analogues and derivatives
/chemical synthesis/chemical synthesis
/Antagonists & Inhibitors/antagonists and inhibitors
/agonists/agonists
Physiology physiology
/physiology/pathophysiology
/genetics/genetics
/Growth & Development/growth and development
/immunology/immunology
/secrecy/secretion
/metabolism/metabolism
/blood/blood
/cerebrospinal fluid/Cerebrospinal fluid
/urine/urine
/biosynthesis/biosynthesis
/enzymology/enzymology
/pharmacokinetics/pharmacokinetics
/deficiency/lack
/etiology
/chemically induced/chemically induced
/complications/complications
/secondary/secondary
/congenital/congenital
/embryology/embryology
/genetics/genetics
/immunology/immunology
/microbiology/microbiology
/virology/virology
/parasitology/parasitology
/transmission/spread
/pharmacology pharmacology
/administration & Dosage/administration and dosage
/diagnostic use/diagnostic application
/pharmacokinetics/pharmacokinetics
/contraindications/contraindications
/adverse effects/side effects
/poisoning/poisoning
/toxicity/toxicity
/diagnosis diagnosis
/pathology/pathology
/radiology y/radiography
/radionuclide imaging/radionuclide imaging
/ultrasonography/ultrasound examination
/statistics & Numerical data statistics and numerical data
/epidemiology/epidemiology
/ethnology/ethnology
/mortality/mortality rate
/therapy treatment
/diet therapy/diet therapy
/drug therapy/drug therapy
/radiotherapy/radiotherapy
/surgery/surgery
/transplantation/transplantation
/prevention & Control/prevention and control
/nursing/nursing
/rehabilitation/rehabilitation
/therapeutic use therapeutic application
/administration & Dosage/administration and dosage
/adverse effects/side effects
/contraindications/contraindications
/poisoning/poisoning
/organization & Administration organization and management
/economics/economics
/legislation & Jurisprudence/Legislation and Law
/supply & Distribution/supply and distribution
/manpower/manpower
/utilization/utilization
/standards/standard
/trends/development trend
12 subheadings not entering the tree table
/drug effects/drug action
/radiation effects/radiation effects
/injuries/injuries
/pathogenicity/pathogenicity
/psychology/psychology
/veterinary/veterinary medicine
/classification/classification
/methods/method
/history/history
/education/education
/instrumentation/instruments and equipment
/ethics/ethics