Intercomparison of laser Doppler wind measurements with other methods and a forecast model

Author(s):  
Christian Werner ◽  
Stephan Rahm ◽  
Susanne Lehner ◽  
Michael Buchhold ◽  
Victor Banakh ◽  
...  
2013 ◽  
Vol 47 (3) ◽  
pp. 19-26 ◽  
Author(s):  
Cortis Cooper ◽  
Tom Mitchell ◽  
George Forristall ◽  
James Stear

AbstractIn 1998, DeepStar began the first of many successful studies that have resolved important questions concerning meteorological and oceanographic (metocean) processes that can cause large loads or fatigue problems on deepwater facilities. In so doing, these studies have immeasurably enhanced the reliability and safety of deepwater structures and pushed the frontiers of ocean science that have traditionally been the realm of academic research. The efforts have focused on three major phenomena: the Loop Current, Topographic Rossby Waves (TRW), and storm winds. Much of the DeepStar effort has focused on improving numerical models of the respective phenomena because they can provide long historical databases at any site—data that serve as the basis for operating and extreme criteria with reasonable statistical uncertainty. Studies of the Loop include the first measurements of the Loop inflow and turbulence and evaluation of existing numerical models. Most of DeepStar’s efforts on TRWs started in 2008, and in a 5-year period, it has developed a validated numerical model and used it to build a 50-year hindcast database. Efforts are underway to use those results to build a stochastic forecast model. Finally, DeepStar has analyzed a large set of wind measurements taken from the powerful recent hurricanes and found that recommended formulas for wind profiles and spectra have significant bias and will be corrected in future recommended practices.


1997 ◽  
Vol 160 (1) ◽  
pp. 123-132
Author(s):  
C. BARFOD ◽  
N. AKGÖREN ◽  
M. FABRICIUS ◽  
U. DIRNAGL ◽  
M. LAURITZEN

VASA ◽  
2005 ◽  
Vol 34 (4) ◽  
pp. 243-249 ◽  
Author(s):  
Drinda ◽  
Neumann ◽  
Pöhlmann ◽  
Vogelsang ◽  
Stein ◽  
...  

Background: Prostanoids are used in the treatment of Raynaud’s phenomenon and acral perfusion disorders secondary to collagenosis. In subjective terms, intravenous administration of these agents produces success in more than 50% of patients. The therapeutic outcome of clinical administration of alprostadil or iloprost may vary from individual to individual. Patients and methods: The following variables were analysed in a cross-over study in 27 patients with collagenosis and Raynaud’s phenomenon: plasma viscosity and erythrocyte aggregation (rheological variables), partial pressure of oxygen and laser Doppler flowmetry in the finger region, and lymphocyte phenotyping and interleukin (IL) determinations (immunological variables). Results: Laser Doppler flowmetry revealed significant differences between patients with secondary Raynaud’s phenomenon and a control group of 25 healthy subjects. Laser Doppler readings did not change significantly as a result of the treatments. Therapy with iloprost produced a reduction in IL-1beta, L-selectin (CD 62 L) and IL-6. Conclusion: The change in immunological variables due to iloprost may explain the long-term effects of prostaglandins in the treatment of Raynaud’s phenomenon. From our results it is not possible to infer any preference for iloprost or alprostadil.


2001 ◽  
pp. 34-39 ◽  
Author(s):  
M. El Hajem ◽  
R. Morel ◽  
J. Y. Champagne ◽  
R. Vilagines ◽  
P. Pagnier
Keyword(s):  

Phlebologie ◽  
1998 ◽  
Vol 27 (04) ◽  
pp. 131-137
Author(s):  
S. Roszinski ◽  
W. Schmeller ◽  
S. Kock
Keyword(s):  

ZusammenfassungBei 12 Patienten mit Erysipelen am Unterschenkel erfolgten Messungen der Mikrozirkulation in Ruhe und bei hämodynamischen Funktionstests. Bestimmt wurden: Hauttemperatur, Erythemstärke (a-Wert der Colorimetrie), transkutaner Sauerstoffpartialdruck (tcPO2 bei 37° C und 44° C Elektrodentemperatur) sowie Laser-Doppler-Flux (LDF). Die Messungen wurden im Zentrum der Erysipele und an den gesunden kontralateralen Beinen zu Beginn, während und eine Woche nach Ende der Antibiotikatherapie durchgeführt. Zum Zeitpunkt der akuten Entzündung zeigten alle Parameter deutliche Veränderungen; diese wiesen Reaktionsmuster auf, wie sie auch bei Dermatosen mit morphologischen Veränderungen des Kapillarsystems gefunden werden. Nach klinischer Abheilung wiesen tcPO2 bei 37° C und Laser-Doppler-Flux sowohl in Ruhe als auch bei den Funktionstests noch deutliche Veränderungen auf.


2020 ◽  
Vol 39 (5) ◽  
pp. 6579-6590
Author(s):  
Sandy Çağlıyor ◽  
Başar Öztayşi ◽  
Selime Sezgin

The motion picture industry is one of the largest industries worldwide and has significant importance in the global economy. Considering the high stakes and high risks in the industry, forecast models and decision support systems are gaining importance. Several attempts have been made to estimate the theatrical performance of a movie before or at the early stages of its release. Nevertheless, these models are mostly used for predicting domestic performances and the industry still struggles to predict box office performances in overseas markets. In this study, the aim is to design a forecast model using different machine learning algorithms to estimate the theatrical success of US movies in Turkey. From various sources, a dataset of 1559 movies is constructed. Firstly, independent variables are grouped as pre-release, distributor type, and international distribution based on their characteristic. The number of attendances is discretized into three classes. Four popular machine learning algorithms, artificial neural networks, decision tree regression and gradient boosting tree and random forest are employed, and the impact of each group is observed by compared by the performance models. Then the number of target classes is increased into five and eight and results are compared with the previously developed models in the literature.


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