This exploratory study was designed to identify a range of variables distinguishing long-term unattached (LTU) from long-term committed (LTC) adults between the ages of 30 and 50. Specifically, it attempted to identify explanations for, and consequences of, long-term unattachment. / LTU subjects selected were those who had not been in a committed, intimate relationship for eight or more years; LTC subjects selected were those who had been in a marital, or equivalent, relationship for eight or more years. / The study was done in two parts. The preliminary study was qualitative and consisted of interviews of 14 subjects--seven LTUs and seven LTCs. LTU and LTC subjects were closely matched on demographic and socioeconomic variables. Emerging themes were added to the range of ideas from the review of literature. A questionnaire was developed from the comprehensive list of ideas. / The final study was quantitative; 77 subjects were administered the questionnaire designed for the study, as well as the Millon Clinical Multiaxial Inventory (MCMI). LTUs' responses to the questionnaire and scores on the MCMI were compared with those of LTC subjects. All variables were subjected to discriminant function analysis, and univariate analysis. / The results showed that: (a) LTUs came from families characterized by significant separations and losses, distant relationships with parents, and little communication within the family; (b) LTUs felt significantly more alienated from others as children and adults than LTCs; (c) LTUs were significantly higher than LTCs on MCMI scales schizoid, avoidant, passive-aggressive, schizotypal, and borderline, i.e., scales of personalities characterized by problems with intimate, committed relationships; (d) LTUs were not significantly more influenced than LTCs by sociocultural changes such as the human potential movement, the women's liberation movement, and the emphasis on romance in our culture; and (e) LTUs suffered significantly more than LTCs from despair and lack of meaning in their lives, and lacked satisfying ways of meeting others with whom they would like to be involved. Implications, limitations of the study, and suggestions for future research are proffered.

PhD / Many popular database management systems implement a multiversion concurrency control algorithm called snapshot isolation rather than providing full serializability based on locking. There are well-known anomalies permitted by snapshot isolation that can lead to violations of data consistency by interleaving transactions that would maintain consistency if run serially. Until now, the only way to prevent these anomalies was to modify the applications by introducing explicit locking or artificial update conflicts, following careful analysis of conflicts between all pairs of transactions. This thesis describes a modification to the concurrency control algorithm of a database management system that automatically detects and prevents snapshot isolation anomalies at runtime for arbitrary applications, thus providing serializable isolation. The new algorithm preserves the properties that make snapshot isolation attractive, including that readers do not block writers and vice versa. An implementation of the algorithm in a relational database management system is described, along with a benchmark and performance study, showing that the throughput approaches that of snapshot isolation in most cases.

Thesis (Ed.D.)--Teachers College, Columbia University. / Typescript; issued also on microfilm. Sponsor: Comilda S. Weinstock. Dissertation Committee: David Singer. Includes bibliographical references.

Thesis (M.A.)--Brandeis University, 2009. / Title from PDF title page (viewed on June 29, 2009). Includes bibliographical references.

Thesis (M. S.)--University of Massachusetts Amherst, 2009. / Includes bibliographical references (p. 42-44).

Thesis (M.S.)--West Virginia University, 1999. / Title from document title page. Document formatted into pages; contains ix, 80 p. : ill. (some col.) Includes abstract. Includes bibliographical references (p. 60-69).

Th. doct.--Physique--Caen, 1993. / Bibliogr. p. 127-128. Notes bibliogr. Résumé en anglais et en français.

Thesis (M.A.)--University of Wisconsin, 1967. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (p. 76-78).

Thesis (M.S.)--University of Wisconsin, 1963. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (p. 61-63).

Thesis (M.S.)--University of Wisconsin--Madison, 1965. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (p. 34-35).