scholarly journals AN ACCELERATED DETERIORATION HAZARD MODEL: APPLYING FOR CONCRETE CARBONATION PROCESSES

2010 ◽  
Vol 66 (3) ◽  
pp. 329-341
Author(s):  
Takashi TANAKA ◽  
Yuji FUJIMORI ◽  
Kiyoyuki KAITO ◽  
Kiyoshi KOBAYASHI ◽  
Takato YASUNO
Keyword(s):  
Hazard Model ◽  
Concrete Carbonation

CARBONATION INDUCED CORROSION ANALYSIS OF REINFORCED CONCRETE STRUCTURES BASED ON FULL PROBABILISTIC APPROACH – AN INDONESIAN CASE STUDY

2018 ◽  
Vol 4 (1) ◽  
pp. 165
Author(s):  
Herry Prabowo ◽  
Mochamad Hilmy
Keyword(s):  
Service Life ◽  
Probabilistic Approach ◽  
Concrete Structures ◽  
Weather Condition ◽  
Analysis Data ◽  
National Standard ◽  
Concrete Carbonation ◽  
Durability Design ◽  
Starting Point ◽  
Real Performance

The assessment of the service life of concrete structures using the durability design approach is widely accepted nowadays. It is really encouraged that a simulation model can resemble the real performance of concrete during the service life. This paper investigates the concrete carbonation through probabilistic analysis. Data regarding Indonesian construction practice were taken from Indonesian National Standard (SNI). Meanwhile, data related to Indonesian weather condition for instance humidity and temperature are taken from local Meteorological, Climatological, and Geophysical Agency from 2004 until 2016. Hopefully the results can be a starting point for durability of concrete research in Indonesia.

scholarly journals A Study of Factors Affecting the Length of Hospital Stay of COVID-19 Patients by Cox-Proportional Hazard Model in a South Indian Tertiary Care Hospital

2021 ◽  
Vol 12 ◽  
pp. 215013272110002
Author(s):  
Gayathri Thiruvengadam ◽  
Marappa Lakshmi ◽  
Ravanan Ramanujam
Keyword(s):  
Hospital Stay ◽  
Tertiary Care ◽  
Length Of Hospital Stay ◽  
Hazard Model ◽  
Cox Proportional Hazard Model ◽  
Care Hospital ◽  
Proportional Hazard ◽  
Proportional Hazard Model ◽  
Cox Proportional Hazard ◽  
South Indian

Background: The objective of the study was to identify the factors that alter the length of hospital stay of COVID-19 patients so we have an estimate of the duration of hospitalization of patients. To achieve this, we used a time to event analysis to arrive at factors that could alter the length of hospital stay, aiding in planning additional beds for any future rise in cases. Methods: Information about COVID-19 patients was collected between June and August 2020. The response variable was the time from admission to discharge of patients. Cox proportional hazard model was used to identify the factors that were associated with the length of hospital stay. Results: A total of 730 COVID-19 patients were included, of which 675 (92.5%) recovered and 55 (7.5%) were considered to be right-censored, that is, the patient died or was discharged against medical advice. The median length of hospital stay of COVID-19 patients who were hospitalized was found to be 7 days by the Kaplan Meier curve. The covariates that prolonged the length of hospital stay were found to be abnormalities in oxygen saturation (HR = 0.446, P < .001), neutrophil-lymphocyte ratio (HR = 0.742, P = .003), levels of D-dimer (HR = 0.60, P = .002), lactate dehydrogenase (HR = 0.717, P = .002), and ferritin (HR = 0.763, P = .037). Also, patients who had more than 2 chronic diseases had a significantly longer length of stay (HR = 0.586, P = .008) compared to those with no comorbidities. Conclusion: Factors that are associated with prolonged length of hospital stay of patients need to be considered in planning bed strength on a contingency basis.

scholarly journals Osteoarthritis and risk of hospitalization for ambulatory care sensitive conditions: A general population-based cohort study

Rheumatology ◽  
2021 ◽  
Author(s):  
Ali Kiadaliri ◽  
Martin Englund
Keyword(s):  
Ambulatory Care ◽  
Hazard Model ◽  
Population Based ◽  
Incidence Rates ◽  
Ambulatory Care Sensitive Conditions ◽  
Chronic Obstructive ◽  
Main Diagnosis ◽  
Increased Risk ◽  
Ambulatory Care Sensitive ◽  
Sensitive Conditions

Abstract Objective To determine the association between osteoarthritis (OA) and risk of hospitalization for ambulatory care sensitive conditions (HACSCs). Methods We included all individuals aged 40–85 years who resided in Skåne, Sweden on 31st December 2005 with at least one healthcare consultation during 1998–2005 (n = 515 256). We identified those with a main diagnosis of OA between January 1, 1998 and December 31, 2016. People were followed from January 1st 2006 until an HACSC, death, relocation outside Skåne, or December 31st 2016 (whichever occurred first). OA status was treated as a time-varying covariate (those diagnosed before January 1, 2006 considered as exposed for whole study period). We assessed relative (hazard ratios (HRs) using Cox proportional hazard model) and absolute (hazard difference using additive hazard model) effects of OA on HACSCs adjusted for potential confounders. Results Crude incidence rates of HACSCs were 239 (95% CI 235, 242) and 151 (150, 152) per 10 000 person-years among OA and non-OA persons, respectively. The OA persons had an increased risk of HACSCs (HR [95% CI] 1.11 [1.09, 1.13]) and its subcategories of medical conditions except chronic obstructive pulmonary disease (HR [95% CI] 0.86 [0.81, 0.90]). There were 20 (95% CI 16, 24) more HACSCs per 10 000 person-years in OA compared with non-OA persons. While HRs for knee and hip OA were generally comparable, only knee OA was associated with increased risk of hospitalization for diabetes. Conclusion OA is associated with an increased risk of HACSCs, highlighting the urgent need to improve outpatient care for OA patients.

Hi-tech Sexism? Evidence from Bangladesh

2020 ◽  
Vol 20 (3) ◽  
Author(s):  
Nazmul Hoque ◽  
Bryan L. Boulier
Keyword(s):  
Sex Determination ◽  
Birth Interval ◽  
Urban Women ◽  
Hazard Model ◽  
Modern Technology ◽  
Son Preference ◽  
Birth Intervals ◽  
Selective Abortion ◽  
China And India ◽  
Missing Women

AbstractWith the advent of modern technology for fetal sex determination, selective abortion is found to be responsible for a significant number of “missing women” in countries like China and India. Using a competing risk hazard model, we investigate whether son preference translates into selective abortion and accounts for any of the “missing women” in Bangladesh. Data suggest that son preference leads to shorter birth intervals if previous births are girls. For example, if the first birth is a girl, the odds of having another child each quarter is about 15% higher and the birth interval is about 2 months shorter for more educated urban women in recent years (1990–2011). However, there is no evidence that selective abortion contributes to missing women in Bangladesh.

Political parties in Canada: What determines entry, exit and the duration of their lives?

2018 ◽  
Vol 26 (5) ◽  
pp. 543-554 ◽  
Author(s):  
J Stephen Ferris ◽  
Marcel-Cristian Voia
Keyword(s):  
Political Parties ◽  
Political Party ◽  
Public Funding ◽  
Hazard Model ◽  
Parametric Models ◽  
Extensive Margin ◽  
Finite Mixtures ◽  
Entry And Exit ◽  
Intensive Margin ◽  
Economic Circumstance

Two margins of political party life in Canada since Confederation (1867) are analyzed—the extensive margin involving entry and exit (together with party turnover or churning) and the intensive margin determining survival length. The results confirm many hypotheses advanced to explain entry and exit—the importance of social and religious cleavage, election institutions, and economic circumstance. More novel are the findings that public election funding and periods with larger immigration flows have reinforced established parties at the expense of entrants and smaller sized parties. The intensive margin uses a discrete hazard model with discrete finite mixtures to confirm the Duverger-type presence of two distinct long-lived political parties surrounded by a fringe of smaller parties. Both parametric and semi-parametric models concur in finding that public funding and higher immigration flows are as successful in extending the life of established parties as in discouraging entry and exit.

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