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Articles 1 - 4 of 4
Full-Text Articles in Technology and Innovation
Publish Or Perish, Gideon Parchomovsky
On The Ellison–Glaeser Geographic Concentration Index, Edward J. Feser
On The Ellison–Glaeser Geographic Concentration Index, Edward J. Feser
Edward J Feser
I use confidential employment data to investigate the empirical properties of a recent industry geographic concentration index (and related index of industry co-agglomeration) proposed by Ellison and Glaeser (1997). The results show that Ellison and Glaeser’s theoretical finding that their concentration measures are robust to differences in the level of spatial aggregation in the underlying employment data does not generally hold in practice. This implies that sensitivity testing for alternative spatial units should accompany any analysis with the concentration measures.
Telecommunications And Economic Growth In The Former Ussr, Gregory J. Brock, Ewan Sutherland
Telecommunications And Economic Growth In The Former Ussr, Gregory J. Brock, Ewan Sutherland
Finance and Economics Faculty Publications
Analyzes the impact of the telecommunications sector on Soviet economic growth using Granger and Sims causality tests.
Approximation Model Building For Reliability & Maintainability Characteristics Of Reusable Launch Vehicles, Resit Unal, W. Douglas Morris, Nancy H. White, Roger A. Lepsch, Richard W. Brown
Approximation Model Building For Reliability & Maintainability Characteristics Of Reusable Launch Vehicles, Resit Unal, W. Douglas Morris, Nancy H. White, Roger A. Lepsch, Richard W. Brown
Engineering Management & Systems Engineering Faculty Publications
This paper describes the development of parametric models for estimating operational reliability and maintainability characteristics for reusable launch vehicle concepts, based on vehicle size and technology support level. A reliability and maintainability analysis tool (RMAT) and response surface methods are utilized to build parametric approximation models for rapidly estimating operational reliability and maintainability characteristics such as mission completion reliability. These models that approximate RMAT, can then be utilized for fast analysis of operational requirements, for lifecycle cost estimating and for multidisciplinary design optimization.