LECTURE on HARDWARE
Computer Science 1 Lecture by David M.
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9-13
17 years ago
Showing posts with label boolean operators. Show all posts
Showing posts with label boolean operators. Show all posts
Tuesday, July 15, 2008
Monday, July 7, 2008
BOOLEAN SEARCH AND RETRIEVAL
BOOLEAN SEARCH AND RETRIEVAL
Title: Boolean Searching. Understanding computers: today and tomorrow.
Author: Morley, D. & Parker, C. (2007)
Publisher: Thomson
Title: Computerized information searching. How to find information in science and technology. 4, 51-71.
Author: Lambert, J. & Lambert, P. (1991)
Publisher: Library Association
Title: Searching and Retrieval. Introduction to Modern Retrieval System. 4, 170-191
Author: Chowdhury, G. G. (2001)
Publisher: Library Association
Title of Article: Beyond recall and Precision: From System – Oriented to User- Oriented Evaluation
Author: Hersh, William (retrieved June 26 ’08)
URL: http://davinci.ohsu.edu/~hersh/user-studies.pdf
Title: Information Technology. 2006 Board Review for Librarians, 6-10.
Author: Esposo, S. S. (2006)
Publisher: Institute of Library and Information Science
ABSTRACT:
One of the most important skills for internet searchers today is to how successfully they can search for information on the internet. But since most people are keen to search for specific information on the internet, often than not, most of the useful information available online is not utilized because it could not be found in time of need. However, Boolean operators aided to make these information retrievable, it is use as part of the search strategy for accessing this vast array of information.
Boolean is use to further specify what a search engine to find. Its rule varies from search sites. It plays an important role in the coordination of the search concepts. Results relevancy to the concept being searched varies, basically, results can be too narrow or too broad depending on how concepts are presented. With the use of Boolean operators, search results could focus solely on one concept excluding the other concept (NOT logic), could retrieve all relevant concepts (AND logic), or relevant documents on either of the two concepts (OR logic). Other online search sites uses (+) for AND, and (-) for NOT.
An effective search strategy is feasible through user’s knowledge of concept keywords (its synonyms and word variant forms), and the application of Boolean operator.
THINGS I LEARNED:
Knowledge of the effective search strategy is a must for a researcher. And knowing at least the basics of Boolean operators is a great advantage, and could help minimize the cost of searching.
However, although the Boolean searching is widely used in keyword searches on most computer- based and online – based system, it still has its limitations especially with regard to the retrieved references ---most searches resulted to high recall but low precision. And at the end of the search process, no matter how extent the information retrieved was , the user is still the one who decides which material among the retrieved relevant by the system are said to be relevant based on his own evaluation.
But in some cases that although the clientele is familiar with the Boolean operators, clienteles understanding about the concept that need to be searched, is still the major influencing factor on the search process since the user is the one providing the key concepts. The Boolean operator functions only as connectors that coordinate the concepts provided by the users.
IMPLICATIONS OF THE NEW THINGS I LEARNED:
Through the readings i have learned to appreciate more the importance of having knowledge in Boolean operators for information specialist like me.
The fluency with concepts of data being searched conjunct with Boolean knowledge, is a great advantage for individuals working in a library to immediately assist their clienteles on doing web-based research, and other computer based system search. And also, in a user-based system set-up, providing an accurate constructed query statement (with the aid of Boolean operators) could help limit the time cost needed for just searching for relevant references from various search sites.
Based from what I have often experienced when doing keyword or phrase searches in online- based systems, I often re-do the search because most of the hits does not match what information I need, thus, I use Boolean operators in order to find at least more relevant references that matches my search query. I can say that knowledge on these search operators definitely helped me in adapting with the challenges presented today by the modern information retrieval systems.
Saturday, July 5, 2008
Boolean and Modern Info. Retrieval
MODERN INFORMATION RETRIEVAL-Inside a Computer: How it Works?Critique on: Boolean Search and Retrieval
Title: Computerized information searching. How to find information in science and technology. 4, 51-71.
Author: Lambert, J. & Lambert, P. (1991)
Publisher: Library Association
Title: Searching and Retrieval. Introduction to Modern Retrieval System. 4, 170-191
Author: Chowdhury, G. G. (2001)
Publisher: Library Association
Title of Article: Beyond recall and Precision: From System – Oriented to User- Oriented Evaluation
Author: Hersh, William (retrieved June 26 ’08)
URL: http://davinci.ohsu.edu/~hersh/user-studies.pdf
Title: Information Technology. 2006 Board Review for Librarians, 6-10.
Author: Esposo, S. S. (2006)
Publisher: Institute of Library and Information Science
ABSTRACT:
The process of searching starts with the user’s construction of his/her query statement based on his/her search topic and then narrow it down into concepts. But prior to the searching process, user should have at least idea on the measures to be taken during the search process. And then during the input of search query (keywords are determined, and Boolean operators are use on the search query), all symbols, images and other details are converted into binary digits (0s and 1s) in order for it be understood and processed by the computer. Query statements that are gathered are converted and instructed in a computer through the input devices, and then the data are processed and manipulated in the CPU which controls the other parts of the computer systems while the microprocessor speeds up the process and retrieval of the information.
Once query statement is entered into the system, the computer is then instructed to find all the references in the database about the search concept. The Boolean operators play an important role during the search process.; it in the coordination of the search concepts----- with user’s familiarity of the keyword synonyms and use the Boolean operators the number of relevant document retrieved varies, it depends on how the search statement is being constructed. The results now can be too narrow or too broad, it could focus solely on one concept excluding the other concept (NOT logic), could retrieve all relevant concepts (AND logic), or relevant documents on either of the two concepts (OR logic). In an online based system, the search processing involves several communication devices that allow the transfer of information searched from one network to another; these communication devices are also the one responsible for connecting on databases that matches the concept being searched through host computers. The search results are then translated into language that human can understand, as output, and viewed through computer screens, printers, and other output devices.
3 THINGS I LEARNED:
The things that I learned from what I have read:
First, knowledge of the effective search strategy is a must for a researcher. And knowing at least the basics of Boolean operators is a great advantage, and could help minimize the cost of searching. Second, although the Boolean searching is widely used on most computer- based system it still has its limitations especially with regard to the relevance of retrieve references---some of the retrieved references are not relevant to the user; and at the end of the search process its still the users that decides which material among the retrieved relevant by the system are said to be relevant on his/her evaluation. Lastly, in some cases that although the user is familiar with the Boolean operators, his/her understanding about the concept of his/her research is still the major influencing factor of the retrieval result since the user is the one providing the key concepts, and the Boolean operators functions only as connectors that coordinates the concepts provided by the users.
IMPLICATIONS OF THE NEW THINGS I LEARNED:
It is important for information specialist like to at least have knowledge in Boolean operators which will definitely help me in adapting with the modern retrieval system. Familiarity with the Boolean operators and key concepts of data searching will be a great advantage for someone working on a library (like me) to immediately assist library clienteles on doing web-based research, and other computer based systems. It can limit the time cost needed for just searching for relevant references. But of course, prior to the search process I should know the details of the client information need to be able to apply a more effective search strategy.
Title: Computerized information searching. How to find information in science and technology. 4, 51-71.
Author: Lambert, J. & Lambert, P. (1991)
Publisher: Library Association
Title: Searching and Retrieval. Introduction to Modern Retrieval System. 4, 170-191
Author: Chowdhury, G. G. (2001)
Publisher: Library Association
Title of Article: Beyond recall and Precision: From System – Oriented to User- Oriented Evaluation
Author: Hersh, William (retrieved June 26 ’08)
URL: http://davinci.ohsu.edu/~hersh/user-studies.pdf
Title: Information Technology. 2006 Board Review for Librarians, 6-10.
Author: Esposo, S. S. (2006)
Publisher: Institute of Library and Information Science
ABSTRACT:
The process of searching starts with the user’s construction of his/her query statement based on his/her search topic and then narrow it down into concepts. But prior to the searching process, user should have at least idea on the measures to be taken during the search process. And then during the input of search query (keywords are determined, and Boolean operators are use on the search query), all symbols, images and other details are converted into binary digits (0s and 1s) in order for it be understood and processed by the computer. Query statements that are gathered are converted and instructed in a computer through the input devices, and then the data are processed and manipulated in the CPU which controls the other parts of the computer systems while the microprocessor speeds up the process and retrieval of the information.
Once query statement is entered into the system, the computer is then instructed to find all the references in the database about the search concept. The Boolean operators play an important role during the search process.; it in the coordination of the search concepts----- with user’s familiarity of the keyword synonyms and use the Boolean operators the number of relevant document retrieved varies, it depends on how the search statement is being constructed. The results now can be too narrow or too broad, it could focus solely on one concept excluding the other concept (NOT logic), could retrieve all relevant concepts (AND logic), or relevant documents on either of the two concepts (OR logic). In an online based system, the search processing involves several communication devices that allow the transfer of information searched from one network to another; these communication devices are also the one responsible for connecting on databases that matches the concept being searched through host computers. The search results are then translated into language that human can understand, as output, and viewed through computer screens, printers, and other output devices.
3 THINGS I LEARNED:
The things that I learned from what I have read:
First, knowledge of the effective search strategy is a must for a researcher. And knowing at least the basics of Boolean operators is a great advantage, and could help minimize the cost of searching. Second, although the Boolean searching is widely used on most computer- based system it still has its limitations especially with regard to the relevance of retrieve references---some of the retrieved references are not relevant to the user; and at the end of the search process its still the users that decides which material among the retrieved relevant by the system are said to be relevant on his/her evaluation. Lastly, in some cases that although the user is familiar with the Boolean operators, his/her understanding about the concept of his/her research is still the major influencing factor of the retrieval result since the user is the one providing the key concepts, and the Boolean operators functions only as connectors that coordinates the concepts provided by the users.
IMPLICATIONS OF THE NEW THINGS I LEARNED:
It is important for information specialist like to at least have knowledge in Boolean operators which will definitely help me in adapting with the modern retrieval system. Familiarity with the Boolean operators and key concepts of data searching will be a great advantage for someone working on a library (like me) to immediately assist library clienteles on doing web-based research, and other computer based systems. It can limit the time cost needed for just searching for relevant references. But of course, prior to the search process I should know the details of the client information need to be able to apply a more effective search strategy.
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