In demand paging virtual memory systems, the page fault rate of a process varies with the number of memory frames allocated to the process. When an increase in the number of allocated frames leads to an increase in the number of page faults, Belady's anomaly is said to occur. In this paper, we present a probability model for Belady's anomaly. We…

The task of managing an IT system in a school environment poses unique challenges. For example, one of the greatest challenges facing individual schools is the lack of integration between various information systems. The present situation in many schools is that there are many disconnected systems managing many different tasks. Systems with…

The report addresses itself to a basic need for educational planning--a data base for comprehensive planning--and documents the development of a planning information system at the completion of the third stage in a proposed 15-stage process. As such, the report is only in its initial phases of development. However, it is being disseminated on a…

The main conclusions are: the human factor appears to be the main variable in all components of an information retrieval system; length of indexes affects performance considerably more than indexing languages; question analysis and search strategies affect performance to a great extent - as much, if not more than indexing. (Author/MF)

The cost of an item of information in a storage system is defined as the sum of an initial cost, a time dependent cost, and a usage cost. Item usage is assumed to follow a simple exponential obsolescence pattern. A decision rule for the economic holding time of an item in storage is derived from the model and based on a policy of minimizing the…

A model of a generalized information storage and retrieval system is proposed. The model consists of six subsystems (or blocks): logical processor, selector, descriptor, file, locator, document file, and analysis block. These subsystems function in a partial environment defined by the user and data blocks. Proceeding from a verbal description, a…

This appendix outlines the ComField information management system which is designed to give the project management a comprehensive tool for decisionmaking and to free instructors from tasks of keeping current records of every student's performance, help them plan their time more efficiently for counseling students and planning instruction, and…

A general model for information storage and retrieval (IS&R) systems is proposed. The system is selected from the set of all available IS&R components. These components define the system's users and data sources; the hardware, software, and personnel performing the actual storage and retrieval activities; and the funder who acts as a filter in the…

It is the purpose of this study to provide fresh insight into the nature of library problems by systematically studying the question of size in various information contexts. In the introduction, the role that size plays from the user's point of view is illustrated. In the following sections, a study of the card catalogue, the classification system…

This report describes approaches to database translation (i.e., transferring data and data definitions from a source, either a database management system (DBMS) or a batch file, to a target DBMS), and recommends a method for representing the data structures of newly-proposed network and relational data models in a form suitable for database…

Discusses data model role in an office filing facility, office data model requirements, and various modelling paradigms for office data modelling. Data model application to a typical collection of office data is presented, filing and retrieval operations are illustrated, and proposed research into other office data modelling aspects is outlined.…

A framework is developed to evaluate expected search length, an important measure of an information storage and retrieval system's performance, as a function of the size of the information file and its organization in terms of indexing search structure. Previous research pertaining to search length by W.S. Cooper and others is surveyed and…

The costs of creating and maintaining permanent files and retrieving keyword title indexes in TRIAL (Technique for Retrieving Information from Abstracts of Literature) are presented. This system, which is used for bibliographic control and file efficiency, is relatively easy to learn and use, and popular with school, academic, business, and…

This report considers universities as information systems because their effective operation is based on the storage, processing, and communication of various types of information. Three basic types of information systems (administrator-, teacher-, and researcher-oriented) are discussed in an attempt to understand each system's operation from the…