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91.
92.
Estimates on the relationship between concentration and R&D effort are shown to be sensitive to problems of aggregation and of adequate measurement of R&D in small firms. While estimates from the official R&D survey of the Netherlands show a highly significant linear relationship between concentration and R&D, comparable estimates from our R&D data base prove it to be insignificant. However, at a finer level of disaggregation and when our sample is split into sectors with low and high technological opportunities, we discover evidence of a quadratic relationship in the latter and evidence of a weak linear relationship in the former. 相似文献
93.
94.
Alfred L. Norman 《Journal of Economic Dynamics and Control》1984,7(1):21-37
Using dynamic programming MacRae obtained a linear feedback law for her open loop constrained variance (OLCV) strategy. To compute the control law requires solving a two point boundary value problem. The dynamic programming formulation does not admit gradient related algorithms. This paper presents an alternative augmented Lagrangian formulation which can be solved as a deterministic constrained optimization problem. The new approach is superior because it admits gradient related algorithms plus all the algorithms which could be employed using the original approach. Three examples demonstrate the superiority of the new approach. 相似文献
95.
Henning Sichelschmidt Peter Michaelis Mohammed Ansari Frank Weiss Torsten Tewes Jan Winiecki Richard Pomfret Jamuna P. Agarwal Richard Pomfret Hartmut Wolf Alfred Boss 《Review of World Economics》1993,129(1):183-201
Ohne Zusammenfassung 相似文献
96.
Alfred L. Norman 《Futures》1975,7(4):321-328
The coming technology of automation, communications, and information processing, contributing to a new “social nervous system”, is discussed. The basic assumptions are that in the future, organisations will have no physical location and that man's primary activities will not be traditional work. The article suggests what this would mean for communities, economic organisations, government and the individual, and proposes a utopian institutional structure based on the stated technological assumptions. 相似文献
97.
We examine the role of human development in US companies' decisions to engage in cross-border acquisitions. Utilizing the human development index (HDI) published by the United Nations Development Program (UNDP), we find that US firms make acquisitions in countries with strong HDI levels. Alternative factors such as institutional quality, life expectancy, telephone usage and school enrolments also have a positive influence on the cross-border acquisition decision. Further, we find a positive relationship between cross-border mergers and acquisitions (M&As) and HDI rankings relative to the United States. Our findings contribute to the literature that seeks to explain why so little capital flows from developed to developing economies. 相似文献
98.
The evidence-based medicine describes the effectiveness of medical therapies by statistical success rates. It’s results can serve as standards of healthcare in medical malpractice liability cases. In the following paper it is shown that these success rates depend on the subjective judging what success is. They further depend on the way how the won data are mathematically processed. The main problem however is that the success rates are of statistical nature. It is known from mathematical statistics that a statistic result does not give any information about the behaviour of a single and specific element, in case of medicine about the effect of a therapy on a concrete patient. In consequence competitive therapies cannot be compared on the basis of statistical information in a specific medical malpractice case. A doctor must therefore inform the patient prior to a therapy about this situation. 相似文献
99.
100.
In the backward-looking model, an explicit instrument rule is almost as efficient as a target rule. An explicit instrument rule leads to a more stable real rate of interest and hence an output stabilization bias compared to the target rule. 相似文献