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排序方式: 共有3465条查询结果,搜索用时 15 毫秒
991.
992.
993.
994.
Engineering Process Controllers (EPC) are frequently based on parametrized models. If process conditions change, the parameter
estimates used by the controllers may become biased, and the quality characteristics will be affected. To detect such changes
it is adequate to use Statistical Process Control (SPC) methods. The run length statistic is commonly used to describe the
performance of an SPC chart. This paper develops approximations for the first two moments of the run length distribution of
a one-sided Shewhart chart used to detect two types of process changes in a system that is regulated by a given EPC scheme:
i) changes in the level parameter; ii) changes in the drift parameter. If the drift parameter shifts, it is further assumed that the form of the drift process changes
from a linear trend under white noise (the in-control drift model) into a random walk with drift model. Two different approximations
for the run length moments are presented and their accuracy is numerically analyzed.
Received: August 1998 相似文献
995.
Dieter Schröder 《Intereconomics》1976,11(8):231-234
The Federal Republic of Germany will be facing in the next few years changes in its economic structure which, if not in their
extent, in their effect on the employment situation will be without parallel in the post-war period. After fifteen years of
nearly uninterrupted full employment, it is reasonable to expect in the medium term an over-all rate of unemployment of the
order of 2–3 p.c. (0.5–0.7 mn). 相似文献
996.
997.
Jani Kilpi Juuso Töyli Ari Vepsäläinen 《International Journal of Production Economics》2009,117(2):360-370
This paper specifies cooperative strategies for the availability service of repairable aircraft components and finds out which factors contribute to the emergence of a particular cooperative strategy. The strategies ad hoc cooperation, cooperative pooling and commercial pooling were specified and compared to the alternative of acting alone, i.e. solo strategy. A simulation model based on fair assumptions of the cost structure was constructed and the cooperative strategies were tested in a game theoretic setting both from the viewpoint of total efficiency and from the perspective of each participant. Despite the explicit focus on aircraft components, the findings should be relevant to any industry using a closed-loop maintenance process with repairable spare parts. 相似文献
998.
Oliver Holtemöller 《Wirtschaftsdienst》2009,89(2):135-140
Zusammenfassung Die Finanzmarktkrise ging weltweit mit einem Rückgang der Aktienkurse einher. Sind diese niedrigen Aktien-Bewertungen als
überreaktion mit der Aussicht auf baldige Korrektur zu bewerten? Oder bringen sie realistische Erwartungen einer schw?cheren
Entwicklung b?rsennotierter deutscher Unternehmen zum Ausdruck? K?nnen anhand der aktuellen Entwicklung der Preis-Dividende-Verh?ltnisse
Aussagen über die zukünftige Kurs- und Dividendenentwicklung gemacht werden?
Prof. Dr. Oliver Holtem?ller, 37, ist Juniorprofessor für Allgemeine Volkswirtschaftslehre an der Fakult?t für Wirtschaftswissenschaften
der Rheinisch-Westf?lischen Technischen Hochschule Aachen. 相似文献
999.
The notion of a natural real rate of interest, due to Wicksell (Interest and prices. Macmillan, London Translation of 1898
edition, 1936), is widely used in current central bank research. The idea is that there exists a level at which the real interest
rate would be compatible with output at its potential level and stationary inflation. Such a concept is of primary concern
for monetary policy because it provides a benchmark for the monetary policy stance. This paper applies the method suggested
by Laubach and Williams (Rev Econ Stat 85(4):1063–1070, 2003) to jointly estimate the natural real interest rate and the output
gap in the euro area using data from 1960 onwards. Our results suggest that the natural real rate of interest has declined
gradually over the past 40 years. They also indicate that monetary policy in the euro area was on average stimulative during
the 1960s and the 1970s, while it contributed to dampen the output gap and inflation in the 1980s and 1990s.
The views expressed in this paper are those of the authors and do not necessarily reflect the opinions of the institutions
to which they are affiliated. We are grateful to Siem Jan Koopman for very helpful suggestions and comments. We also thank
P. Cour-Thimann, V. Curdia, F. Drudi, S. McCaw, D. Rodriguez-Palenzuela, R. Pilegaard, H. Pill, L. Stracca, T. Laubach, J.
C. Williams and the participants of an ECB workshop on natural interest rates. 相似文献
1000.
Henning Vöpel 《Wirtschaftsdienst》2009,89(7):487-488
Ohne Zusammenfassung 相似文献