scholarly journals Using regression theory to solve some problems regarding ship repairing and maintenance activities in shipyards

2020 ◽  
Vol XXIII (2) ◽  
pp. 153-160
Author(s):  
Manea Emil
Keyword(s):  
Time Frame ◽  
Maintenance Activities ◽  
Regression Theory ◽  
Over Time

The owners will always try to reduce the ships maintenance works timeframe clearly aimed at reducing the period during which the ship has no income. In turn, the shipyard also will try to reduce the timeframe for the maintenace works carried out on board of the drydocked ships and alongside berths, clearly aimed at revenue maximizing by contracting a larger number of ships for drydocking. The objective was to find a method (using regression theory) for the ships drydocking and/or berthed maintenance works carried out in the shiprepairs shipyards time frame that exploits the information held by the shipyard in their maintenance and repairs works portfolio performed for various customers over time.

scholarly journals Mortality Risk and The Progression of The Electronic Frailty Index and Hospital Frailty Risk Score Over Time

2020 ◽  
Vol 5 (5) ◽  
Author(s):  
Joe Hollinghurst ◽  
Alan Watkins
Keyword(s):  
Risk Score ◽  
Frailty Index ◽  
Time Frame ◽  
Time Dependent ◽  
Cox Models ◽  
Hazard Ratios ◽  
Increased Risk ◽  
The Matrix ◽  
Time Dependent Covariates ◽  
Over Time

IntroductionThe electronic Frailty Index (eFI) and the Hospital Frailty Risk Score (HFRS) have been developed in primary and secondary care respectively. Objectives and ApproachOur objective was to investigate how frailty progresses over time, and to include the progression of frailty in a survival analysis.To do this, we performed a retrospective cohort study using linked data from the Secure Anonymised Information Linkage Databank, comprising 445,771 people aged 65-95 living in Wales (United Kingdom) on 1st January 2010. We calculated frailty, using both the eFI and HFRS, for individuals at quarterly intervals for 8 years with a total of 11,702,242 observations. ResultsWe created a transition matrix for frailty states determined by the eFI (states: fit, mild, moderate, severe) and HFRS (states: no score, low, intermediate, high), with death as an absorbing state. The matrix revealed that frailty progressed over time, but that on a quarterly basis it was most likely that an individual remained in the same state. We calculated Hazard Ratios (HRs) using time dependent Cox models for mortality, with adjustments for age, gender and deprivation. Independent eFI and HFRS models showed increased risk of mortality as frailty severity increased. A combined eFI and HFRS revealed the highest risk was primarily determined by the HFRS and revealed further subgroups of individuals at increased risk of an adverse outcome. For example, the HRs (95% Confidence Interval) for individuals with an eFI as fit, mild, moderate and severe with a high HFRS were 18.11 [17.25,19.02], 20.58 [19.93,21.24], 21.45 [20.85,22.07] and 23.04 [22.34,23.76] respectively with eFI fit and no HFRS score as the reference category. ConclusionFrailty was found to vary over time, with progression likely in the 8-year time-frame analysed. We refined HR estimates of the eFI and HFRS for mortality by including time dependent covariates.

Spray-on Ceramic Insulation up to 450°C and Encapsulating existing corrosion without sandblast

2013 ◽  
Author(s):  
Joseph E. Pritchett
Keyword(s):  
Heat Load ◽  
Time Frame ◽  
Trial And Error ◽  
System Research ◽  
Coated Film ◽  
Resin Solution ◽  
Set Up ◽  
Ceramic Compounds ◽  
Hot Surface ◽  
Over Time

Ceramic compounds have been around for many years, but the research to find which compounds, what size, crystalline structure and density would perform to block “heat load” is the keys the selecting the correct compounds to use. “Blocking heat load from radiation or resisting the absorption and loading of heat when used over a hot surface” is determined by the aspects stated above. None of this could be determined from the ceramic catalogs of listed compounds stating referenced characteristics. To determine how a compound would react in a paint/coating form could only be realized by trial and error when the compound is mixed in a resin solution with other compounds to see the result. This process has taken 23 years and over 3600 compounds to find 12 compounds that will continue to work when wet and mixed with other materials. As to the corrosion encapsulation without the need for sandblasting, this was studied after finding that most all corrosion protection specifications require sandblast, primers and top coats which over time did not perform as theory had projected. Part of the reason is due to the time frame after the blast is performed before the paints are applied. By the time the paints are applied a flash rust or bloom has set up and the surface is now out of specification and the result is a failure of the system. Research was applied on how a corrosion coating could be made to first penetrate deep into the pores of metal or rust, then swell and encapsulate the pores and/or surface rust before it sets up to 6780 psi surface tensile strength. In this way, the surface rust is used as the profile needed to anchor the coating and add to the strength of the coated film.

Concepts And History Of Strategy In Organizations

2011 ◽  
pp. 1-31
Author(s):  
Tamio Shimizu ◽  
Marley Monteiro de Carvalho ◽  
Fernando Jose Barbin Laurindo
Keyword(s):  
Time Frame ◽  
Napoleonic Wars ◽  
Military Commanders ◽  
History Of ◽  
Military Campaigns ◽  
Ancient Times ◽  
Over Time

The concept of strategy was born in military campaigns whose results, whether good or bad, were largely the product of the minds of strategists. From ancient times, much has been said about great military commanders and their strategies. The word strategic comes from the Greek stratego, which literally means general. In the classic division of war into operational, tactical, and strategic aspects, strategy is linked to planning, to the broader environment and the longest time frame. Even though its meaning has changed over time, since the Napoleonic wars it has encompassed military, political and economic dimensions.

scholarly journals Provincial and Temporal Variation in Macrolide and Lincosamide Antimicrobial Use by Outpatients in Canada, 1995 to 2010

2014 ◽  
Vol 25 (2) ◽  
pp. 103-106 ◽  
Author(s):  
Shiona K Glass-Kaastra ◽  
Rita Finley ◽  
Jim Hutchinson ◽  
David M Patrick ◽  
Karl Weiss ◽  
...  
Keyword(s):  
Mixed Models ◽  
Repeated Measures ◽  
Secular Trend ◽  
Time Frame ◽  
Antimicrobial Use ◽  
Patterns Of Use ◽  
Defined Daily Doses ◽  
The Mean ◽  
Canadian Provinces ◽  
Over Time

INTRODUCTION: Because antimicrobial use is commonly associated with the development of antimicrobial resistance, monitoring the volume and patterns of use of these agents is very important.OBJECTIVE: To assess the use of macrolide and lincosamide (ML) antimicrobials within Canadian provinces over time, and to compare use rates with those reported by European countries.METHODS: Antimicrobial prescribing data were used to develop two yearly metrics: prescriptions per 1000 inhabitant-days (PrIDs) and the mean defined daily doses (DDDs) per prescription, which were then used to build linear mixed models to assess differences among provinces over time.RESULTS: After accounting for repeated measures over time, prescribing rates (PrIDs) varied significantly according to province and year (P<0.001). However, little change occurred within each province over the time frame studied; from 1995 to 2010, each province had a PrID change <0.01. Quebec and British Columbia had significantly lower prescribing rates than all other provinces. No overall secular trend was apparent. In contrast, the DDDs per prescription did not vary significantly according to province, but showed a significant year-to-year increase.DISCUSSION: ML prescribing varied among provinces in Canada between 1995 and 2010, but remained relatively stable within each province. The average DDDs per ML prescription did not vary according to province, but increased linearly over time. These increases are likely to indicate that fewer prescriptions are being written for children over time, a practice supported by good antimicrobial stewardship principles.

Aging Couples: Benefits and Costs of Long Intimate Relations

2018 ◽  
Author(s):  
Victoria I. Michalowski ◽  
Denis Gerstorf ◽  
Christiane A. Hoppmann
Keyword(s):  
Time Frame ◽  
Multiple Time Scales ◽  
Future Research ◽  
Multiple Time ◽  
Physical And Mental Health ◽  
Short Term ◽  
Intimate Relations ◽  
Benefits And Costs ◽  
Over Time

Aging does not occur in isolation, but often involves significant others such as spouses. Whether such dyadic associations involve gains or losses depends on a myriad of factors, including the time frame under consideration. What is beneficial in the short term may not be so in the long term, and vice versa. Similarly, what is beneficial for one partner may be costly for the other, or the couple unit over time. Daily dynamics between partners involving emotion processes, health behaviors, and collaborative cognition may accumulate over years to affect the longer-term physical and mental health outcomes of either partner or both partners across adulthood and into old age. Future research should move beyond an individual-focused approach to aging and consider the importance of and interactions among multiple time scales to better understand how, when, and why older spouses shape each other’s aging trajectories, both for better and for worse.

Childbirth Yesterday and Today: A Comparative Analysis of Women’s Experiences and Feelings through the Ages to the Present

2020 ◽  
Vol 8 (8) ◽  
pp. 100-109
Author(s):  
Grażyna Bączek ◽  
Joanna Jasińska
Keyword(s):  
Comparative Analysis ◽  
Perinatal Care ◽  
Time Frame ◽  
Chi Square ◽  
The Past ◽  
Chi Square Test ◽  
Main Determinants ◽  
Changes Over Time ◽  
Delivery Rooms ◽  
Over Time

Introduction: Perinatal care has undergone many changes over time. Therefore, women’s feelings and experiences will differ depending on the perinatal care provided at the time of childbirth. Time of childbirth and the perinatal care received are the main determinants in this process. However, one thing remains unchanged over time. Childbirth is considered one of the most notable events in the life of every woman.  The aim of the study was a comparative analysis of experiences and feelings shared by females giving birth in the past and the present in Poland. Material and methods: A questionnaire was designed specifically for this research project. It was a set of multiple choice (single answer) questions concerning childbirth conditions and perinatal care. Results were analyzed with a chi square test. Data was collected in 2016 in Poland. The questionnaire was distributed both in paper and electronic form. Results: The study group comprised of 671 females divided into three groups: childbirth before 2000, between 2001–2012, and after 2013. This time frame was associated with significant changes in perinatal care in Poland over the years. Changes in the delivery rooms have raised the comfort of childbirth, but progression of obstetrics resulted in greater medicalization of childbirth.

Impact of timing from blood sampling to pharmacodynamic assessment on measures of platelet reactivity in patients treated with P2Y12 receptor inhibitors

2016 ◽  
Vol 116 (12) ◽  
pp. 1060-1069 ◽  
Author(s):  
Fabiana Rollini ◽  
Francesco Franchi ◽  
Kamaldeep Singh ◽  
Jung Cho ◽  
Mona Bhatti ◽  
...  
Keyword(s):  
Platelet Reactivity ◽  
Time Frame ◽  
Blood Sampling ◽  
Light Transmittance ◽  
P2y12 Inhibitors ◽  
Artery Disease ◽  
A Prospective Study ◽  
The Impact ◽  
Trough Levels ◽  
Over Time

SummarySeveral platelet function tests (PFT) are available to assess the pharmacodynamic (PD) effects of P2Y12 inhibitors. However, there are technical variances between PFT, and P2Y12 inhibitors differ in pharmacological properties. Manufactures of PFT recommend a time-frame within which assessments needs to be executed. However, if the timing from blood sampling to processing affects PD results is unknown. We conducted a prospective study assessing the impact of timing from blood sampling to processing on PD measures using three different PFT. We studied 60 aspirin-treated patients with coronary artery disease (CAD) on maintenance P2Y12 inhibiting therapy [clopidogrel 75 mg/day (n=20), prasugrel 10 mg/day (n=20) and ticagrelor 90 mg bid (n=20)]. PD assessments (trough levels) were performed by VerifyNow P2Y12 (VN), light transmittance aggregometry (LTA) and vasodilator-stimulated phosphoprotein (VASP) at 30 minutes, 2 and 4 hours post-sampling; VASP was also performed at 24 hours. P2Y12 reaction units (PRU) by VN significantly decreased over time with all P2Y12 inhibitors (clopidogrel p<0.001; prasugrel p=0.016; ticagrelor p<0.001). PRU at 30 minutes and 2 hours were similar, but decreased at 4 hours. LTA showed consistent findings with VN. Conversely, PD measures as assessed by VASP were stable over time (p>0.1 for all P2Y12 inhibitors). In conclusion, in CAD patients on maintenance therapy with P2Y12 inhibitors, timing from blood sampling to processing significantly influences PD measures as assessed by VN and LTA, but not by VASP.

scholarly journals Sexual selection gradients change over time in a simultaneous hermaphrodite

eLife ◽  
2017 ◽  
Vol 6 ◽  
Author(s):  
Jeroen NA Hoffer ◽  
Janine Mariën ◽  
Jacintha Ellers ◽  
Joris M Koene
Keyword(s):  
Sexual Selection ◽  
Reproductive Success ◽  
Mating Success ◽  
Time Window ◽  
Time Frame ◽  
Male Reproductive Success ◽  
Simultaneous Hermaphrodite ◽  
Selection Gradients ◽  
Short Time Window ◽  
Over Time

Sexual selection is generally predicted to act more strongly on males than on females. The Darwin-Bateman paradigm predicts that this should also hold for hermaphrodites. However, measuring this strength of selection is less straightforward when both sexual functions are performed throughout the organism’s lifetime. Besides, quantifications of sexual selection are usually done during a short time window, while many animals store sperm and are long-lived. To explore whether the chosen time frame affects estimated measures of sexual selection, we recorded mating success and reproductive success over time, using a simultaneous hermaphrodite. Our results show that male sexual selection gradients are consistently positive. However, an individual’s female mating success seems to negatively affect its own male reproductive success, an effect that only becomes visible several weeks into the experiment, highlighting that the time frame is crucial for the quantification and interpretation of sexual selection measures, an insight that applies to any iteroparous mating system.

scholarly journals Continuity and Decline. Temporal Expression of Denominational Cemeteries in Contemporary Times

2019 ◽  
pp. 71-96
Author(s):  
Anna Majewska
Keyword(s):  
Time Frame ◽  
Second World War ◽  
Temporal Expression ◽  
World War ◽  
Second World ◽  
Over Time

The study attempts to systematize the leading transformations observed nowadays in denominational cemeteries located in Poland. The time frame of the analyses was limited to the period from the end of the Second World War to the present. Four basic types of transformations have been distinguished and divided into two main directions of changes reported over time, namely: harmonious temporal expression (stagnation/decline, continuation) and disharmonious temporal expression (desacralisation, resacralisation and commemoration). Each type of transformation is discussed separately based on selected examples. However, it needs to be emphasised that the proposed division is not disjunctive as considering the multitude of factors that determine changes in the material structures of cemeteries, processes sometimes run parallel to each other or overlap in time.

Relationship and sexual satisfaction: A developmental perspective on bidirectionality

2019 ◽  
Vol 37 (2) ◽  
pp. 624-646 ◽  
Author(s):  
Christopher Quinn-Nilas
Keyword(s):  
Relationship Satisfaction ◽  
Sexual Satisfaction ◽  
The United States ◽  
Time Frame ◽  
Linear Increase ◽  
Latent Growth ◽  
Stable Marriages ◽  
Longitudinal Association ◽  
Curve Modeling ◽  
Over Time

Researchers have investigated the directionality between relationship and sexual satisfaction; however, there remains no definitive conclusion. Previous longitudinal studies have not conceptualized relationship and sexual satisfaction as systematic developmental processes and have focused on predicting scores at later time points. Instead, researchers should be concerned with understanding how relationship and sexual satisfaction change together over time. The objective of this study was to use longitudinal data from midlife American marriages to test the directionality of the association between relationship satisfaction and sexual satisfaction. Multivariate latent growth curve modeling of 1,456 midlife Americans married for 20 years from the Midlife in the United States study was used to compare directionality models. Findings support that long-term, stable marriages of midlife Americans at the sample level were characterized by a linear increase in relationship satisfaction over 20 years and a linear decline in sexual satisfaction during the same time frame. A co-change model, wherein relationship and sexual satisfaction changed together over time, fit the data best. Trajectory correlations showed that changes in relationship and sexual satisfaction were strongly interconnected. High initial levels of sexual satisfaction protected against declines in relationship satisfaction over 20 years. Results support that relationship and sexual satisfaction change together over time and highlight that the longitudinal association between these outcomes is dynamic rather than static.

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