Fire fighting in aerospace product development : a study of project capacity and resource planning in an aerospace enterprise

Thesis (S.M.)--Massachusetts Institute of Technology, System Design & Management Program, 2003.Includes bibliographical references.It is broadly recognized in the aerospace industry, as well as many others, that organizations which effectively execute development projects to meet desired cost, schedule, and performance targets for their customers produce higher levels of customer satisfaction and also a significant source of competitive advantage. Continually meeting the needs of the customer through effective project execution allows a company to become a preferred supplier favored in source selection for follow-on contracts and new development projects necessary for business growth. This research effort examines one aerospace company, which has multiple, diverse development projects on-going at any one time across several business units. The motivation for this thesis is to explore the product/system development capacity of the enterprise by analyzing the historical program performance of major projects, understanding the level of problem projects or fire fighting within the project pipeline, and the perceived causes of poor project performance. In addition, system dynamics models are developed to analyze the dynamics associated with project planning and resource planning strategies for both multi-project and single project scenarios. This analysis provides insight into the potential for project pipeline "tipping" and the effects of various project management and resource planning strategies in an aerospace product/system development context. Such analysis is believed to provide greater insight and opportunity to improve the product/system development performance for the enterprise.by Allan J. McQuarrie, Jr.S.M

Alcoholism and animals

Studies in animals of alcohol-associated phenomena have begun to yield data which may provide a better understanding of human alcoholism. Four such phenomena, tolerance, dependence, hepatic damage and self-intoxication, have been demonstrated in both animals and man. The relationships among these phenomena, however, have not yet been determined in either human or nonhuman species. Tolerance to and physical dependence on alcohol have been clearly demonstrated in a number of animal species. The behavioral, physiological and biochemical correlates of tolerance and dependence are of considerable contemporary experimental interest. In particular, animal models of alcohol withdrawal signs will yield excellent preparations for the study of the management of problems associated with ethanol withdrawal in man. Chronic liver damage, a problem often associated with alcoholism, has been demonstrated in animals; however, it remains unclear whether the conditions necessary for its production are equivalent in animals and man. Through an approach based on operant conditioning, behavioral phenomena associated with ethanol-reinforced self-intoxication are being elucidated in animals and man. These findings provide a descriptive framework which could lead to a delimitation of the important variables that control ethanol intoxication in both animals and man; hence, new avenues for treatment and prevention of human alcoholism may be elaborated.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/22395/1/0000845.pd

Model selection in orthogonal regression

We develop the relationship between the stepwise F-test model selection criteria and information-based criteria for orthogonal regression models. We obtain the asymptotic properties of the stepwise F-tests with respect to efficiency and consistency. The performances of F-test as well as other efficient and consistent criteria are compared via a large scale simulation study. The results indicate that three of the F-test criteria should be considered for routine data analysis.AIC Asymptotic property Consistency Efficiency F-test SIC

The model selection criterion AICu

For regression and time series model selection, Hurvich and Tsai (1989) obtained a bias correction Akaike information criterion, AICc, which provides better model order choices than the Akaike information criterion, AIC (Akaike, 1973). In this paper, we propose an alternative improved regression model selection criterion, AICu, which is an approximate unbiased estimator of Kullback-Leibler information. We show that AICu is neither a consistent (Shibata, 1986) nor an efficient (Shibata, 1980, 1981) criterion. Our simulation studies indicate that the behavior of AICu is a compromise between that of efficient (AICc) and consistent (BIC, Akaike, 1978) criteria. Specifically, AICu performs better than AICc for moderate to large sample sizes except when the true model is of infinite order. In addition, it outperforms BIC except when a true model exists and the sample size is large.AIC AICu BIC Kullback-Leibler information

物理化学 : 分子論的アプローチ 下

透明テキスト付き画像PDF未校正（No.525）北海道大学附属図書館から国立国会図書館へファイル提供済のため、国立国会図書館障害者用資料検索（みなサーチ）で利用可能北海道大学 附属図書館 060-0808 札幌市北区北8条西5丁目 問合せ先：利用支援課相互利用担当 TEL：011-706-4095 MAIL：[email protected]

物理化学 : 分子論的アプローチ 上

透明テキスト付き画像PDF未校正（No.524）北海道大学附属図書館から国立国会図書館へファイル提供済のため、国立国会図書館障害者用資料検索（みなサーチ）で利用可能北海道大学 附属図書館 060-0808 札幌市北区北8条西5丁目 問合せ先：利用支援課相互利用担当 TEL：011-706-4095 MAIL：[email protected]