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- Yunus, Kalid, 1983, et al.
(author)
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Distribution grid impact of Plug-In Electric Vehicles charging at fast charging stations using stochastic charging model
- 2011
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In: Power Electronics and Applications (EPE 2011), Proceedings of the 2011-14th European Conference. - 9789075815153 ; :Aug. 30 2011-Sept. 1 2011, s. 1-11
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Conference paper (peer-reviewed)abstract
- Charging PEVs (Plug-In Electric Vehicles) at public fast charging station can improve the public acceptance and increase their penetration level by solving problems related to vehicles' battery. However, the price for the impact of fast charging stations on the distribution grid has to be dealt with. The main purpose of this paper is to investigate the impacts of fast charging stations on a distribution grid using a stochastic fast charging model and to present the charging model with some of its results. The model is used to investigate the impacts on distribution transformer loading and system bus voltage profiles of the test distribution grid. Stochastic and deterministic modelling approaches are also compared. It is concluded that fast charging stations affect transformer loading and system bus voltage profiles. Hence, necessary measures such as using local energy storage and voltage conditioning devices, such as SVC (Static Var Compensator), have to be used at the charging station to handle the problems. It is also illustrated that stochastic modelling approach can produce a more sound and realistic results than deterministic approach.
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| 3. |
- Kania, Magdalena, 1980-, et al.
(author)
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Older active users of ICTs make sense of their engagement
- 2017
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In: Seminar.net. - 1504-4831. ; 13:1, s. 1-17
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Journal article (peer-reviewed)abstract
- Research on older people’s ICT usage tends to focus on either the ways in which they go about learning to use these technologies or the impact that ICTs have on their lives. This research seems, in other words, to take for granted that older people are ‘digital immigrants’ as the digital divide debate proposed. Research that specifically looks at the ways in which older ICT users make sense of their engagement with these technologies is still limited. This article explores therefore – through focus group interviews – how a group of older people who are active ICT users make sense of their ‘digital nativeness’. The analysis shows that the interviewees are well aware that their ICT proficiency differentiated them from their peers, which is why they make sense of their ICT usage by making reference to the issues that make them ‘exceptional’ older people. These include the fact that they have used computers for many years and therefore made ICT usage an everyday habit early on; the fact that most older people do not have the skills that they themselves have, which is why they feel the need to share them with others; and the fact that their lifelong experience means they can use these technologies in judicious ways. By bringing attention to how older active ICT users make sense of their engagement, this article contributes to the notion of the digital spectrum and the debate on the inequalities that ICT proficiency brings about.
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| 4. |
- Vancheri, Federico, et al.
(author)
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Effect of Age on Left Ventricular Global Dyssynchrony in Asymptomatic Individuals : A Population Study
- 2016
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In: Echocardiography. - : Wiley-Blackwell. - 0742-2822 .- 1540-8175. ; 33:7, s. 977-983
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Journal article (peer-reviewed)abstract
- Background and Aim: Left ventricular (LV) segmental dyssynchrony is common in patients with heart failure or myocardial activation abnormalities and is associated with increased cardiovascular risk. Total isovolumic time (t-IVT) and Tei index are sensitive indexes of global ventricular dyssynchrony. The aim of this study was to investigate the effect of age on t-IVT and Tei index. Methods: We evaluated 410 individuals with no evidence for coronary heart disease or activation abnormalities. T-IVT was calculated as 60 - (total ejection time + total filling time) and Tei index as t-IVT/total ejection time. The relationship between age, LV systolic and diastolic function parameters as well as t-IVT and Tei index was studied. Results: Ejection fraction and stroke volume did not change with age, whereas early diastolic filling velocity fell and atrial systolic velocity increased, reducing the E/A ratio. Isovolumic contraction time (IVCT) and isovolumic relaxation time (IVRT) lengthened. With every 10 years of age, total LV ejection time shortened by 1.5 sec/min and total filling time by 2.1 sec/min. T-IVT and Tei index increased with age and strongly correlated with IVCT and E/A, but not with ejection fraction or QRS duration. Conclusion: Normal aging is associated with worsening of LV global dyssynchrony shown by prolongation of isovolumic times resulting in shortening of filling and ejection times. Age also affects diastolic function as shown by E/A but not systolic function parameters, ejection fraction or stroke volume. Worsening of global dyssynchrony correlates with that of diastolic function but not with QRS duration.
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| 6. |
- Denoyes-Rothan, B, et al.
(author)
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Inheritance of resistance to Colletotrichum acutatum in Fragaria x ananassa
- 2005
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In: Phytopathology. - : AMER PHYTOPATHOLOGICAL SOC. - 0031-949X .- 1943-7684. ; 95:4, s. 405-412
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Journal article (peer-reviewed)abstract
- Anthracnose, caused by Colletotrichum acutatum, is a major disease of the octoploid cultivated strawberry, Fragaria x ananassa. The inheritance of high and intermediate level plant resistances to C. acutatum, pathogenicity group 2, was investigated in an 8 x 8 factorial design. A single dominant gene (Rca2) controlled the high-level resistance, although minor genes may also contribute to resistance in cultivars such as Belrubi. The intermediate level of resistance was quantitative and controlled by minor genes. Analysis of 26 genotypes and cultivars from Fragaria spp. showed that the dominant gene was not rare in the germ plasm of E x ananassa and that anthracnose resistance was also present in other species of Fragaria. These findings have important implications for anthracnose resistance breeding.
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| 8. |
- Jolbäck, Per, et al.
(author)
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Does surgeon experience affect patient-reported outcomes 1 year after primary total hip arthroplasty?
- 2018
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In: Acta Orthopaedica. - : Medical Journals Sweden AB. - 0300-8827 .- 1745-3674 .- 1745-3682. ; 89:3, s. 265-271
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Journal article (peer-reviewed)abstract
- Background and purpose - Several studies have reported on the influence of various factors on patient-reported outcomes (PROs) after total hip arthroplasty (THA), but very few have focused on the experience of the surgeon. We investigated any association between surgeons' experience and PROs 1 year after primary THA. Patients and methods - Patient characteristics and surgical data at 10 hospitals in western Sweden were linked with PROs (EQ-5D-3L, Satisfaction Visual Analogue Scale (VAS), Pain VAS). These data were retrieved from the Swedish Hip Arthroplasty Register (SHAR). The surgeon's level of experience was divided into 4 subgroups related to experience: < 8 years, 8-15 years, and >15 years of clinical practice after specialist certificate. If no specialist certificate was obtained the surgery was classified as a trainee surgery. Surgeons with >15 years' experience as an orthopedic specialist were used as reference group in the analyses. Results - 8,158 primary THAs due to osteoarthritis were identified. We identified the surgeons' level of experience in 8,116 THAs. Data from SHAR on pre- and postoperative PROs and satisfaction at 1 year were available for 6,713 THAs. We observed a statistically significant difference among the 4 groups of surgeons regarding mean patient age, ASA classification, Charnley classification, diagnosis, and fixation technique. At 1-year follow-up, there were no statistically significant differences in Pain VAS, EQ-5D index, or EQ VAS among the subgroups of orthopedic specialists. Patients operated on by orthopedic trainees reported less satisfaction with the result of the surgery compared with the reference group. Interpretation - These findings indicate that patients can expect similar health improvements, pain reduction, and satisfaction 1 year after a primary THA operation irrespective of years in practice after specialty certification as an orthopedic surgeon.
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| 9. |
- Jolbäck, Per, et al.
(author)
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High annual surgeon volume reduces the risk of adverse events following primary total hip arthroplasty: a registry-based study of 12,100 cases in Western Sweden
- 2019
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In: Acta Orthopaedica. - : Medical Journals Sweden AB. - 1745-3674 .- 1745-3682. ; 90:2, s. 153-158
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Journal article (peer-reviewed)abstract
- Background and purpose — Most earlier publications investigating whether annual surgeon volume is associated with lower levels of adverse events (AE), reoperations, and mortality are based on patient cohorts from North America. There is also a lack of adjustment for important confounders in these studies. Therefore, we investigated whether higher annual surgeon volume is associated with a lower risk of adverse events and mortality within 90 days following primary total hip arthroplasty (THA). Patients and methods — We collected information on primary total hip arthroplasties (THA) performed between 2007 and 2016 from 10 hospitals in Western Sweden. These data were linked with the Swedish Hip Arthroplasty Register and a regional patient register. We used logistic regression (simple and multiple) adjusted for age, sex, comorbidities, BMI, fiation technique, diagnosis, surgical approach, time in practice as orthopedic specialist and annual volume. Annual surgeon volume was calculated as the number of primary THAs the operating surgeon had performed 365 days prior to the index THA. Results — 12,100 primary THAs, performed due to both primary and secondary osteoarthritis by 268 different surgeons, were identified. The median annual surgeon volume was 23 primary THAs (range 0–82) 365 days prior to the THA of interest and the mean risk of AE within 90 days was 7%. If the annual volume increased by 10 primary THAs in the simple logistic regression the risk of AE decreased by 10% and in the adjusted multiple regression the corresponding number was 8%. The mortality rate in the study was low (0.2%) and we could not find any association between 90-day mortality and annual surgeon volume. Interpretation — High annual surgical activity is associated with a reduced risk of adverse events within 90 days. Based on these findings healthcare providers should consider planning for increased surgeon volume. © 2019, © 2019 The Author(s). Published by Taylor & Francis on behalf of the Nordic Orthopedic Federation.
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| 10. |
- Boon, Wietse M., et al.
(author)
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An Adaptive Penalty Method for Inequality Constrained Minimization Problems
- 2021
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In: European Conference on Numerical Mathematics and Advanced Applications, ENUMATH 2019. - Cham : Springer Science and Business Media Deutschland GmbH. ; , s. 155-164
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Conference paper (peer-reviewed)abstract
- The primal-dual active set method is observed to be the limit of a sequence of penalty formulations. Using this perspective, we propose a penalty method that adaptively becomes the active set method as the residual of the iterate decreases. The adaptive penalty method (APM) therewith combines the main advantages of both methods, namely the ease of implementation of penalty methods and the exact imposition of inequality constraints inherent to the active set method. The scheme can be considered a quasi-Newton method in which the Jacobian is approximated using a penalty parameter. This spatially varying parameter is chosen at each iteration by solving an auxiliary problem.
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