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Search Results: 1 - 10 of 31046 matches for " Thomas Frede "
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Breast cancer incidence and mortality in Tyrol/Austria after fifteen years of opportunistic mammography screening
Willi Oberaigner, Wolfgang Buchberger, Thomas Frede, Rudolf Knapp, Christian Marth, Uwe Siebert
BMC Public Health , 2010, DOI: 10.1186/1471-2458-10-86
Abstract: To study time trends in breast cancer incidence and mortality, we applied the age-period-cohort model by Poisson regression to the official mortality data covering more than three decades from 1970 to 2006 and to the incidence data ranging from 1988 to 2006. In addition, for incidence data we analysed data on breast cancer staging and compared these with EU guidelines.For the analysis of time trend in breast cancer mortality in age groups 40-79, an age-period-cohort model fits well and shows for years 2002-2006 a statistically significant reduction of 26% (95% CI 13%-36%) in breast cancer mortality as compared to 1992-1996.We see only slight non-significant increases in breast cancer incidence. For the past five years, incidence data show a 10% proportion of in situ cases, and of 50% for cases in stages II+.The opportunistic breast cancer screening programme in Tyrol has only in part exploited the mortality reduction known for organised screening programmes. There seems to be potential for further improvement, and we recommend that an organised screening programme and a detailed screening database be introduced to collect all information needed to analyse the quality indicators suggested by the EU guidelines.Breast cancer (BC) is the leading cause of female cancer death in all industrialised countries (and also worldwide) and the breast is also the leading incident cancer site for females [1]. Therefore, screening methods for BC are of greatest public health importance. Efficiency and efficacy of organised mammography screening programmes have been proven in large randomised trials conducted in Europe and North America. For several years already, organised mammography screening programmes have been recommended in the EU[2]. Austria is one of the European countries where up to 2006 no organised programmes were implemented, but where coverage in spontaneous mammography screening could have been rather high. In a micro-census conducted in Austria in 2006-2007, more tha
Introduction of organised mammography screening in tyrol: results of a one-year pilot phase
Willi Oberaigner, Wolfgang Buchberger, Thomas Frede, Martin Daniaux, Rudolf Knapp, Christian Marth, Uwe Siebert
BMC Public Health , 2011, DOI: 10.1186/1471-2458-11-91
Abstract: In June 2007, the system of opportunistic mammography screening in Tyrol was changed to an organised system by introducing a personal invitation system, a training program, a quality assurance program and by setting up a screening database. All procedures are noted in a written protocol. Most EU recommendations for organised mammography screening were followed, except double reading. All women living in Tyrol and covered by social insurance are now invited for a mammography, in age group 40-59 annually and in age group 60-69 biannually. Screening mammography is offered mainly by radiologists in private practice. We report on the results of the first year of piloting organised mammography screening in two counties in Tyrol.56,432 women were invited. Estimated participation rate was 34.5% at one year of follow-up (and 55.5% at the second year of follow-up); 3.4% of screened women were recalled for further assessment or intermediate screening within six months. Per 1000 mammograms nine biopsies were performed and four breast cancer cases detected (N = 68). Of invasive breast cancer cases 34.4% were ≤ 10 mm in size and 65.6% were node-negative. In total, six interval cancer cases were detected during one year of follow-up; this is 19% of the background incidence rate.In the Tyrolean breast cancer screening program, a smooth transition from a spontaneous to an organised mammography screening system was achieved in a short time and with minimal additional resources. One year after introduction of the screening program, most of the quality indicators recommended by the European guidelines had been reached.However, it will be necessary to introduce double reading, to change the rule for BI-RADS 3, and to concentrate on actions toward improving the participation rate.Breast cancer is the leading cause of female cancer death in all industrialised countries (and also worldwide), and the breast is also the leading incident cancer site for females [1]. Therefore, screening metho
Use of hyperlinks in electronic test result communication: a survey study in general practice
Mukai Thomas,Bro Flemming,Fenger-Gr?n Morten,Olesen Frede
BMC Medical Informatics and Decision Making , 2012, DOI: 10.1186/1472-6947-12-114
Abstract: Background Information is essential in healthcare. Recording, handling and sharing healthcare information is important in order to ensure high quality of delivered healthcare. Information and communication technology (ICT) may be a valuable tool for handling these challenges. One way of enhancing the exchange of information could be to establish a link between patient-specific and general information sent to the general practitioner (GP). The aim of the present paper is to study GPs' use of a hyperlink inserted into electronic test result communication. Methods We inserted a hyperlink into the electronic test result communication sent to the patients’ GPs who participated in a regional, systematic breast cancer screening program. The hyperlink target was a web-site with information on the breast cancer screening program and breast cancer in general. Different strategies were used to increase the GPs’ use of this hyperlink. The outcome measure was the GPs’ self-reported use of the link. Data were collected by means of a one-page paper-based questionnaire. Results The response rate was 73% (n=242). In total, 108 (45%) of the GPs reported to have used the link. In all, 22% (n=53) of the GPs used the web-address from a paper letter and 37% (n=89) used the hyperlink in the electronic test result communication (Δ = 15%[95%confidence int erval(CI) = 8 22%P < 0.001]). We found no statistically significant associations between use of the web-address/hyperlink and the GP’s gender, age, or attitude towards mammography screening. Conclusions The results suggest that hyperlinks in electronic test result communication could be a feasible strategy for combining and sharing different types of healthcare information.
A preliminary nonlinear analysis of the earth's chandler wobble
V. Frede,P. Mazzega
Discrete Dynamics in Nature and Society , 2000, DOI: 10.1155/s1026022600000042
Abstract: The Chandler wobble (CW) is a resonant response of the Earth rotational pole wandering around its figure axis whose excitation mechanism is still uncertain. It appears as polar motion oscillations with an average period of about 433 days and a slowly varying amplitude in the range (0–300) milliarcsec (mas). We here perform a nonlinear analysis of the CW via a time-delay coordinate embedding of its measured X and Y components and show that the CW can be interpreted as a low dimensional unstable deterministic process.
The Impact of Power Switching Devices on the Thermal Performance of a 10 MW Wind Power NPC Converter
Ke Ma,Frede Blaabjerg
Energies , 2012, DOI: 10.3390/en5072559
Abstract: Power semiconductor switching devices play an important role in the performance of high power wind energy generation systems. The state-of-the-art device choices in the wind power application as reported in the industry include IGBT modules, IGBT press-pack and IGCT press-pack. Because of significant deviation in the packaging structure, electrical characteristics, as well as thermal impedance, these available power switching devices may have various thermal cycling behaviors, which will lead to converter solutions with very different cost, size and reliability performance. As a result, this paper aimed to investigate the thermal related characteristics of some important power switching devices. Their impact on the thermal cycling of a 10 MW three-level Neutral-Point-Clamped wind power converter is then evaluated under various operating conditions; the main focus will be on the grid connected inverter. It is concluded that the thermal performances of the 3L-NPC wind power converter can be significantly changed by the power device technology as well as their parallel configurations.
Gothic Runic Inscriptions in Scandinavia?
Hans Frede Nielsen
Futhark : International Journal of Runic Studies , 2012,
Abstract:
Low-Voltage Ride-Through Capability of a Single-Stage Single-Phase Photovoltaic System Connected to the Low-Voltage Grid
Yongheng Yang,Frede Blaabjerg
International Journal of Photoenergy , 2013, DOI: 10.1155/2013/257487
Abstract:
Disturbance Observer-Based Simple Nonlinearity Compensation for Matrix Converter Drives
Kyo-Beum Lee,Frede Blaabjerg
Journal of Electrical and Computer Engineering , 2009, DOI: 10.1155/2009/215782
Abstract: This paper presents a new method to compensate the nonlinearity for matrix converter drives using disturbance observer. The nonlinearity of matrix converter drives such as commutation delay, turn-on and turn-off time of switching device, and on-state switching device voltage drop is modeled by disturbance observer and compensated. The proposed method does not need any additional hardware and offline experimental measurements. The proposed compensation method is applied for high-performance induction motor drives using a 3?kW matrix converter system without a speed sensor. Simulation and experimental results show that the proposed method using disturbance observer provides good compensating characteristics. 1. Introduction Induction motor drives fed by matrix converter have been developed for the last two decades [1]. The matrix converter drive has recently attracted the industry application, and the technical development has been further accelerated because of the increasing importance of power quality and energy efficiency issues [2]. Since the fundamental output voltage cannot be detected directly from the matrix converter output terminal in a matrix converter drive, the command voltage is usually used instead of the actual one. However, the commanded voltage does not agree with the actual fundamental output voltage due to nonlinear characteristic of the matrix converter, such as commutation delay, turn-on and turn-off time of switching device, and on-state switching device voltage drop. In order to compensate this problem, the authors have made an attempt to compensate the nonlinear matrix converter effects with current sign and offline manners [3]. However, it is difficult to determine the current sign when the phase currents are closed to zero. If the current sign is misjudged, the nonlinearity model of a matrix converter operates improperly. It is also difficult to compensate the nonlinearity effects perfectly by offline manners because the switching times and voltage drops of the power devices are varied with the operating conditions [4]. In this paper, a new online nonlinearity compensation method for matrix converter drives using a disturbance observer is proposed. Figure 1 shows the whole control block diagram of a sensorless vector-controlled matrix converter drive with disturbance observer-based nonlinearity compensation. The proposed method does not need any additional hardware and offline experimental measurements. The paper calculates the nonlinearity of matrix converter drives using disturbance observer, and the simple feed-forward
Caregivers' active role in palliative home care – to encourage or to dissuade? A qualitative descriptive study
Anna Weibull, Frede Olesen, Mette Neergaard
BMC Palliative Care , 2008, DOI: 10.1186/1472-684x-7-15
Abstract: The study was a qualitative, descriptive study based on semi-structured individual interviews with seven bereaved spouses.Four main categories were found: Degree of involvement, Positive and Negative impact and Prerequisites. The prerequisites found for a positive outcome were Safety (24-hour back-up), Confidence (Professionals' confidence in the spouses' abilities) and Dialog (Spouses' influence on decision-making and being asked).The results from this study identified important issues whenever spouses take an active part in medical treatment and physical care of critically ill patients in palliative care. The results question the previous research that active involvement of family care givers could be harmful and add preconditions to a positive outcome. More research into these preconditions is needed.Family members have always been active in palliative home care, but in modern times death is no longer merely a family event. The role of the professional extends into the home of the dying, where primary health care and palliative care teams can provide highly specialized treatment for the dying. The spouse's involvement in this treatment is often a prerequisite for home death.Home deaths have been shown to be associated with both better bereavement response and better physical health post-bereavement than inpatient deaths [1] and it has been shown to be important to the family member to have been doing something for the loved one who died [2-4].Family caregivers seem to cope better with bereavement after a loved one's death if sufficient support is provided during the palliative stage of disease at home [5-12].However, literature has shown that whenever family caregivers take an active part in the patients' treatment it might have a negative effect on the relatives' mental and physical wellbeing [2,13] and that the relatives sometimes experience an unspoken pressure from the professionals to be 'professionals' rather than loving relatives [5].Hence, we do not know
General practitioners' experience and benefits from patient evaluations
Hanne N Heje, Peter Vedsted, Frede Olesen
BMC Family Practice , 2011, DOI: 10.1186/1471-2296-12-116
Abstract: A patient evaluation survey of 597 voluntarily participating GPs was performed by means of the EUROPEP questionnaire. Evaluation results were fed back to the GPs as written reports at a single feedback meeting with group discussions of the results. Between 3 and 17 months after the feedback, the 597 GPs received a questionnaire with items addressing their experience with and perceived benefit from the evaluations.79.4% of the GPs responded. 33% of the responding GPs reported that the patient evaluation had raised their attention to the patient perspective on the quality of general practice care. Job satisfaction had improved among 26%, and 21% had developed a more positive attitude to patient evaluations. 77% of the GPs reported having learnt from the evaluation. 54% had made changes to improve practice, 82% would recommend a patient evaluation to a colleague and 75% would do another patient evaluation if invited. 14% of the GPs had become less positive towards patient evaluations, and job satisfaction had decreased among 3%.We found a significant impact on the GPs regarding satisfaction with the process and attitude towards patient evaluations, GPs' attention to the patients' perspective on care quality and their job satisfaction. Being benchmarked against the average seemed to raise barriers to the concept of patient evaluations and difficulties interpreting the results may have formed a barrier to their implementation which was partly overcome by adding qualitative data to the quantitative results. The GPs' significant willingness to share and discuss the results with others may have served as a facilitator.Patient evaluations have become an integral part of the quality assessment of health care. By basing the methods for patient evaluations on studies of patients' priorities regarding the quality and by singling out aspects of care that are particularly important from their perspective, patients become a crucial source of information in quality improvement effor
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