Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1992. / Vita. Abstract. Includes bibliographical references (leaves 122-123). Also available via the Internet.

Thesis (Ed. D)--Teachers College, Columbia University. / Typescript; issued also on microfilm. Sponsor: Harold Abeles. Dissertation Committee: Lenore Pogonowski. Bibliography: leaves 157-188.

Thesis (Ph. D.)--Illinois State University, 1985. / Title from title page screen, viewed June 8, 2005. Dissertation Committee: John McCarthy (chair), Timothy Duffy, Gary Fish, David Franklin, Ronald Halinski, James Hallam. Includes bibliographical references (leaves 187-192) and abstract. Also available in print.

Thesis (M.S.)--University of Wisconsin--Madison, 1981. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 24-25).

Thesis (M. Phil.)--University of Hong Kong, 1990.

Thesis (Ph. D.)--Illinois State University, 1990. / Title from title page screen, viewed November 30, 2005. Dissertation Committee: Ronald S. Halinski (chair), Timothy Duffy, Edward R. Hines, Patricia H. Klass, John R. McCarthy. Includes bibliographical references (leaves 135-141) and abstract. Also available in print.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1981. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 71-75).

Thesis (Ph. D.)--Ohio State University, 1985. / Includes vita. Includes bibliographical references (leaves 276-281). Available online via OhioLINK's ETD Center.

Thesis (Masters Diploma (Information Technology))--Cape Technikon, Cape Town, 1994 / Computer virus programs are generally perceived to be a threat to the information stored by computer users. This research evaluated the impact computer viruses have on information stored by computer users. The emphasis was on the effects of computer viruses rather than on the detail of their operation. The main hypotheses involved the question of whether or not computer viruses do pose a threat to the information stored by computer users. The effect of computer viruses on the information of users in industry was measured by sending a questionnaire to 388 companies country-wide. &~ average of 2l,5% of the respondents claimed detrimental effects to information stored on disk due to computer viruses. This and other data was used to guide laboratory experiments on the actual damage done by computer viruses to stored information. A set of test disks was prepared to represent programs and data of a typical PC user in industry. Fifteen different virus programs were used individually to infect the test disks. After each infection, all the test disks were inspected to ascertain damage to data, system and program files as well as to separate disk sectors. The research established that: The damage done by computer viruses to stored information is generally limited to one file or disk area. Where damage to stored information did occur, it was often reversible. Irrational user responses to virus symptoms provide a large potential source for damage to stored information. The availability of master program disks (for program file restoration) and recent, validated data backup is essential to recovery from a computer virus infection. A user can solve most problems caused by virus infections if he has a basic understanding of disk structure, i.e. tracks, sectors, sides, the FAT, etc, and of the use of disk utility programs like Norton Utilities or PCTools. The fact that some of the findings of prominent virus researchers could not be verified, suggests that virus programs could be unstable. Claims regarding the damage inflicted by viruses must be considered to be valid only for a specific copy of the virus under discussion. The importance of using original application software (to minimize the transfer of viruses and to enable program file restoration) , regular back-ups (to enable data file restoration) and basic user awareness (infection prevention, symptoms, the use of anti-viral and utility programs, etc.) was emphasized. The average PC user should be able to clear up a virus infection without assistance by following the given disinfection procedure. Suggestions for further study include virus origins, generations, mutations, multiple infections, and the effect of viruses on computer networks.

This thesis describes the evaluation of four operating systems for microcomputers. The emphasis of the study is on the suitability of the operating systems for use in real-time applications, such as process control. The evaluation was performed in two sections. The first section was a quantitative assessment of the performance of the real-time features of the operating system. This was performed using benchmarks. The criteria for the benchmarks and their design are discussed. The second section was a qualitative assessment of the suitability of the operating systems for the development and implementation of real-time systems. This was assessed through the implementation of a small simulation of a manufacturing process and its associated control system. The simulation was designed using the Ward and Mellor real-time design method which was extended to handle the special case of a real-time simulation. The operating systems which were selected for the study covered a spectrum from general purpose operating systems to small, specialised real-time operating systems. From the quantitative assessment it emerged that QNX (from Quantum Software Systems) had the best overall performance. Qualitatively, UNIX was found to offer the best system development environment, but it does not have the performance and the characteristics required for real-time applications. This suggests that versions of UNIX that are adapted for real-time applications are worth careful consideration for use both as development systems and implementation systems.