An efficient importance sampling method for long-term fatigue assessment of deepwater risers with time domain analysis

2016 ◽  
Vol 45 ◽  
pp. 102-114 ◽  
Author(s):  
Yidan Gao ◽  
Ying Min Low
Keyword(s):  
Importance Sampling ◽  
Time Domain ◽  
Sampling Method ◽  
Time Domain Analysis ◽  
Domain Analysis ◽  
Fatigue Assessment ◽  
Importance Sampling Method ◽  
Deepwater Risers

Long-Term Fatigue Analysis of Deepwater Risers in the Time Domain

2014 ◽  
Author(s):  
Yidan Gao ◽  
Ying Min Low
Keyword(s):  
Time Domain ◽  
Time Domain Analysis ◽  
Fatigue Analysis ◽  
Sea State ◽  
Need To Evaluate ◽  
Nature Of Time ◽  
The Time Domain ◽  
Computational Difficulty ◽  
Deepwater Risers

A floating production system is exposed to many different environmental conditions over its service life. Consequently, the long-term fatigue analysis of deepwater risers is computationally demanding due to the need to evaluate the fatigue damage from a multitude of sea states. Because of the nonlinearities in the system, the dynamic analysis is often performed in the time domain. This further compounds the computational difficulty owing to the time consuming nature of time domain analysis, as well as the need to simulate a sufficient duration for each sea state to minimize sampling variability. This paper presents a new and efficient simulation technique for long-term fatigue analysis. The results based on this new technique are compared against those obtained from the direct simulation of numerous sea states.

scholarly journals Impaired circadian heart rate variability in Parkinson’s disease: a time-domain analysis in ambulatory setting

2019 ◽  
Author(s):  
Valentina Arnao ◽  
Antonio Cinturino ◽  
Sergio Mastrilli ◽  
Carmelo Buttà ◽  
Carlo Maida ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Heart Rate ◽  
Parkinson's Disease ◽  
Heart Rate Variability ◽  
Time Domain ◽  
Time Domain Analysis ◽  
Domain Analysis ◽  
Ambulatory Setting ◽  
Yahr Stage

Abstract Background Heart rate variability (HRV) decreases in Parkinson’s disease (PD) and it can be considered a marker for cardiovascular dysautonomia.Purpose To evaluate long-term time-domain analysis of HRV of PD patients and compare the results with those of matched healthy individuals.Method Idiopathic PD patients without comorbidity impairing HRV, and age-matched healthy individuals were recruited in a pilot study. A long-term time domain analysis of HRV using 24-hour ambulatory ECG was performed.Results 18 PD patients fulfilling inclusion criteria completed the evaluation (mean age was 55.6 ±8.8, disease duration: 5.0±4.7). Mean SCOPA-AUT score was 10.1±7.3. Patients were on Hoehn & Yahr stage 1-2 and mean Levodopa Equivalent Dose (LED) was 311 ± 239.9. Mean of the 5-minute standard deviation (SD) of R-R intervals distribution (SDNN) for all 5 min segments of the entire recording (ISDNN) was significantly lower in patients compared to controls. ISDNN significantly correlated with age, LED, levodopa and SCOPA-AUT scores.Conclusion In our population characterized by mild to moderate disease severity, time-domain assessment of HRV seemed to be a potential tool to characterize cardiovascular dysautonomia. Decrease of ISDNN in PD may reflect a circadian overall sympathetic and parasympathetic disarrangement.

scholarly journals Impaired circadian heart rate variability in Parkinson’s disease: a time-domain analysis in ambulatory setting

2020 ◽  
Author(s):  
Valentina Arnao ◽  
Antonio Cinturino ◽  
Sergio Mastrilli ◽  
Carmelo Buttà ◽  
Carlo Maida ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Heart Rate ◽  
Parkinson's Disease ◽  
Heart Rate Variability ◽  
Time Domain ◽  
Time Domain Analysis ◽  
Domain Analysis ◽  
Ambulatory Setting ◽  
Healthy Individuals

Abstract Background Heart rate variability (HRV) decreases in Parkinson’s disease (PD) and it can be considered a marker for cardiovascular dysautonomia. Purpose To evaluate long-term time-domain analysis of HRV of PD patients and compare the results with those of matched healthy individuals. Method Idiopathic PD patients without comorbidity impairing HRV, and age-matched healthy individuals were recruited in a pilot study. A long-term time domain analysis of HRV using 24-hour ambulatory ECG was performed. Results Overall, 18 PD patients fulfilling inclusion criteria completed the evaluation (mean age was 55.6 ±8.8, disease duration: 5.0±4.7). Mean SCOPA-AUT score was 10.1±7.3. Patients were on Hoehn & Yahr stage 1-2 and mean Levodopa Equivalent Dose (LED) was 311 ± 239.9. Mean of the 5-minute standard deviation (SD) of R-R intervals distribution (SDNN) for all 5 min segments of the entire recording (ISDNN) was significantly lower in patients compared to controls. ISDNN was significantly different between Parkinson’s disease patients and healthy controls.Conclusion In our population characterized by mild to moderate disease severity, time-domain assessment of HRV seemed to be a potential tool to characterize cardiovascular dysautonomia. Decrease of ISDNN in PD may reflect an autonomic derangement extending all day and night long.

scholarly journals Impaired circadian heart rate variability in Parkinson’s disease: a time-domain analysis in ambulatory setting

2020 ◽  
Author(s):  
Valentina Arnao ◽  
Antonio Cinturino ◽  
Sergio Mastrilli ◽  
Carmelo Buttà ◽  
Carlo Maida ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Heart Rate ◽  
Parkinson's Disease ◽  
Heart Rate Variability ◽  
Time Domain ◽  
Time Domain Analysis ◽  
Domain Analysis ◽  
Ambulatory Setting ◽  
Healthy Individuals

Abstract Background Heart rate variability (HRV) decreases in Parkinson’s disease (PD) and it can be considered a marker for cardiovascular dysautonomia. Purpose To evaluate long-term time-domain analysis of HRV of PD patients and compare the results with those of matched healthy individuals. Method Idiopathic PD patients without comorbidity impairing HRV, and age-matched healthy individuals were recruited in a pilot study. A long-term time domain analysis of HRV using 24-hour ambulatory ECG was performed. Results Overall, 18 PD patients fulfilling inclusion criteria completed the evaluation (mean age was 55.6 ±8.8, disease duration: 5.0±4.7). Mean SCOPA-AUT score was 10.1±7.3. Patients were on Hoehn & Yahr stage 1-2 and mean Levodopa Equivalent Dose (LED) was 311 ± 239.9. Mean of the 5-minute standard deviation (SD) of R-R intervals distribution (SDNN) for all 5 min segments of the entire recording (ISDNN) was significantly lower in patients compared to controls. ISDNN was significantly different between Parkinson’s disease patients and healthy controls. Conclusion In our population characterized by mild to moderate disease severity, time-domain assessment of HRV seemed to be a potential tool to characterize cardiovascular dysautonomia. Decrease of ISDNN in PD may reflect an autonomic derangement extending all day and night long.

Long-term prognostic value of time domain analysis of signal-averaged electrocardiography in idiopathic dilated cardiomyopathy

2000 ◽  
Vol 85 (5) ◽  
pp. 618-623 ◽  
Author(s):  
Laurent Fauchier ◽  
Dominique Babuty ◽  
Pierre Cosnay ◽  
Philippe Poret ◽  
Philippe Rouesnel ◽  
...  
Keyword(s):  
Dilated Cardiomyopathy ◽  
Time Domain ◽  
Prognostic Value ◽  
Time Domain Analysis ◽  
Domain Analysis ◽  
Idiopathic Dilated Cardiomyopathy ◽  
Value Of Time

scholarly journals Impaired circadian heart rate variability in Parkinson’s disease: a time-domain analysis in ambulatory setting

2020 ◽  
Author(s):  
Valentina Arnao ◽  
Antonio Cinturino ◽  
Sergio Mastrilli ◽  
Carmelo Buttà ◽  
Carlo Maida ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Heart Rate ◽  
Parkinson's Disease ◽  
Heart Rate Variability ◽  
Pilot Study ◽  
Time Domain ◽  
Time Domain Analysis ◽  
Domain Analysis ◽  
Healthy Individuals

Abstract Background Heart rate variability (HRV) decreases in Parkinson’s disease (PD) and it can be considered a marker for cardiovascular dysautonomia. The purpose of this pilot study is to evaluate long-term time-domain analysis of HRV of PD patients and compare the results with those of matched healthy individuals. Methods Idiopathic PD patients without comorbidity impairing HRV, and age-matched healthy individuals were recruited in a pilot study. A long-term time domain analysis of HRV using 24-hour ambulatory ECG was performed. Results Overall, 18 PD patients fulfilling inclusion criteria completed the evaluation (mean age was 55.6±8.8, disease duration: 5.0±4.7). Mean SCOPA-AUT score was 10.1±7.3. Patients were on Hoehn & Yahr stage 1-2 and mean Levodopa Equivalent Dose (LED) was 311±239.9. Mean of the 5-minute standard deviation (SD) of R-R intervals distribution (SDNN) for all 5 min segments of the entire recording (ISDNN) was significantly lower in patients compared to controls. ISDNN was significantly different between Parkinson’s disease patients and healthy controls. Conclusions In our population characterized by mild to moderate disease severity, time-domain assessment of HRV seemed to be a potential tool to characterize cardiovascular dysautonomia. Decrease of ISDNN in PD may reflect an autonomic derangement extending all day and night long.

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