| 61. |
- Hast, Martin, et al.
(författare)
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Design of Optimal Low-Order Feedforward Controllers
- 2012
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Ingår i: 2nd IFAC Conference on Advances in PID Control 2012. - 9781627483247 ; , s. 483-488
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Konferensbidrag (refereegranskat)abstract
- Design rules for optimal feedforward controllers with lead-lag structure in the presence of measurable disturbances are presented. The design rules are based on stable first-order models with time delays, FOTD, and are optimal in the sense of minimizing the integrated-squared error. The rules are derived for an open-loop setting, considering a step disturbance. This paper also discusses a general feedforward structure, which enables decoupling in the design of feedback and feedforward controllers, and justifies the open-loop setting.
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| 62. |
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| 63. |
- Hast, Martin, et al.
(författare)
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Low-order feedforward controllers: Optimal performance and practical considerations
- 2014
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Ingår i: Journal of Process Control. - : Elsevier BV. - 1873-2771 .- 0959-1524. ; 24:9, s. 1462-1471
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Tidskriftsartikel (refereegranskat)abstract
- Feedforward control from measurable disturbances can significantly improve the performance in control loops. However, tuning rules for such controllers are scarce. In this paper design rules for how to choose optimal low-order feedforward controller parameter are presented. The parameters are chosen so that the integrated squared error, when the system is subject to a step disturbance, is minimized. The approach utilizes a controller structure that decouples the feedforward and the feedback controller. The optimal controller can suffer from undesirable high-frequency noise characteristics and tuning methods for how to filter the control signal are also provided. For scenarios where perfect disturbance attenuation in theory is achievable but where noise-filtering is needed, the concept of precompensation is introduced as a way to shift the controller time-delay to compensate for the low-pass filtering.
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| 64. |
- Hast, Martin, et al.
(författare)
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Optimal proportional–integral–derivative set-point weighting and tuning rules for proportional set-point weights
- 2015
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Ingår i: IET Control Theory and Applications. - : Institution of Engineering and Technology (IET). - 1751-8652. ; 9:15, s. 2266-2272
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Tidskriftsartikel (refereegranskat)abstract
- In this study, design of low-order feedforward controllers from both reference signal and measurable disturbance for proportional–integral–derivative (PID) controllers is considered. The feedforward controllers from reference are equivalent to the use of a PID controller with set-point weighting. The design problem is formulated as a convex optimisation problem and then solved for a batch of process models. The optimal proportional set-point weights are then used to derive tuning rules that minimise the integrated absolute error. Examples illustrate the usefulness of the proposed method and tuning rules
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| 65. |
- Horan, Dan, et al.
(författare)
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Injuries in elite-level womens football - a two-year prospective study in the Irish Womens National League
- 2022
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Ingår i: Scandinavian Journal of Medicine and Science in Sports. - : Wiley. - 0905-7188 .- 1600-0838. ; 32:1, s. 177-190
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Tidskriftsartikel (refereegranskat)abstract
- We investigated the pattern of injuries in elite-level womens football in Ireland, during a two-season prospective injury surveillance study in the Womens National League (WNL). Seven out of the eight clubs (271 players) in the WNL were followed prospectively during the 2018 and 2019 seasons. The injury incidence rate in matches (19.2/1000 h) was 7.5 times higher than in training (2.5/1000 h). Players, on average, sustained 0.69 injuries per season (266 injuries/383 player seasons), which equates to 15 time-loss injuries per season for a squad of 22 players. The majority of the injuries sustained by players were lower extremity injuries (85%), of which, 46% had a non-contact injury mechanism. Muscle, ligament, and contusion injuries were the most common injury types, while the ankle, knee, and thigh were the most commonly injured body sites. The most common injuries sustained over the two seasons were lateral ankle sprains (13.9%), hamstring strains (12.4%), knee meniscus/cartilage injuries (7.5%), adductor strains (6%), quadriceps strains (4.5%), and ankle contusions (4.5%). The injuries with the highest injury burden were ACL injuries (59 days lost/1000 h), knee meniscus/cartilage injuries (23/1000 h), lateral ankle sprains (21/1000 h), hamstring strains (12/1000 h), MCL sprains (11/1000 h), and quadriceps strains (11/1000 h). There were 8 ACL tears documented over the 2 seasons, which accounted for 28% of all time lost to injury with a mean days lost per injury of 247. We recommend that clubs in the WNL in Ireland should implement injury risk mitigation strategies, with a particular focus on injuries with a high injury burden.
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| 66. |
- Horan, Dan, et al.
(författare)
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Injury incidence rates in womens football: a systematic review and meta-analysis of prospective injury surveillance studies
- 2023
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Ingår i: British Journal of Sports Medicine. - : BMJ PUBLISHING GROUP. - 0306-3674 .- 1473-0480. ; 57:8, s. 471-480
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Forskningsöversikt (refereegranskat)abstract
- Objective To review the literature to establish overall, match and training injury incidence rates (IIRs) in senior (>= 18 years of age) womens football (amateur club, elite club and international). Design Systematic review and meta-analysis of overall, match and training IIRs in senior womens football, stratified by injury location, type and severity. Data sources MEDLINE via PubMed; EMBASE via Ovid; CINAHL via EBSCO and Web of Science were searched from earliest record to July 2021. Eligibility criteria for selecting studies (1) football players participating in a senior womens football league (amateur club or elite club) or a senior womens international football tournament; (2) the study had to report IIRs or provide sufficient data from which this outcome metric could be calculated through standardised equations; (3) a full-text article published in a peer-reviewed journal before July 2021; (4) a prospective injury surveillance study and (5) case reports on single teams were ineligible. Results 17 articles met the inclusion criteria; amateur club (n=2), elite club (n=10), international (n=5). Overall, match and training time-loss IIRs are similar between senior womens elite club football and international football. Time-loss training IIRs in senior womens elite club football and international football are approximately 6-7 times lower than their equivalent match IIRs. Overall time-loss IIRs stratified by injury type in womens elite club football were 2.70/1000 hours (95% CI 1.12 to 6.50) for muscle and tendon, 2.62/1000 hours (95% CI 1.26 to 5.46) for joint and ligaments, and 0.76/1000 hours (95% CI 0.55 to 1.03) for contusions. Due to the differences in injury definitions, it was not possible to aggregate IIRs for amateur club football. Conclusion Lower limb injuries incurred during matches are a substantial problem in senior womens football. The prevention of lower limb joint, ligament, muscle and tendon injuries should be a central focus of injury prevention interventions in senior womens amateur club, elite club and international football. PROSPERO registration number CRD42020162895.
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| 67. |
- Horan, Dan, et al.
(författare)
-
More than likely the men come first. Thats just very frustrating. A qualitative exploration of contextual factors affecting the implementation of injury prevention initiatives and the provision of effective injury management in elite-level womens club football in Ireland
- 2024
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Ingår i: British Journal of Sports Medicine. - : BMJ PUBLISHING GROUP. - 0306-3674 .- 1473-0480. ; 58, s. 89-96
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Tidskriftsartikel (refereegranskat)abstract
- ObjectivesThe aim of our study was to explore the contextual factors that affect the implementation of football injury prevention initiatives and the provision of effective injury management in the Irish Womens National League (WNL).MethodsWe used a criterion-based purposive sampling approach to recruit coaches (n=7), players (n=17) and medical personnel (n=8) representing eight of the nine clubs in the WNL to participate in one-to-one semistructured interviews. Our study was located within an interpretivist, constructivist research paradigm. The interview data were analysed using reflexive thematic analysis.ResultsThe participants identified academic and work pressures, financial challenges, conflict with college football, inadequate facilities and gender inequity as being barriers to the implementation of injury prevention initiatives and the provision of effective injury management. Financial constraints within clubs were perceived to limit the provision of medical care and strength and conditioning (S&C) support and this was deemed to be associated with a heightened risk of injuries.ConclusionSpecific contextual factors were identified which curtail the implementation of injury prevention initiatives and the provision of effective injury management in elite-level womens club football in Ireland. Gender inequity was identified as one of the factors impacting the availability of high-quality medical care, S&C support, as well as access to training and match facilities. Our results provide new insights that could be used to inform the design and implementation of injury prevention and management initiatives for women football players in Ireland.
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| 68. |
- Horan, Dan, et al.
(författare)
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Players, Head Coaches, And Medical Personnels Knowledge, Understandings and Perceptions of Injuries and Injury Prevention in Elite-Level Womens Football in Ireland
- 2023
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Ingår i: SPORTS MEDICINE-OPEN. - : SPRINGER. - 2199-1170. ; 9:1
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Tidskriftsartikel (refereegranskat)abstract
- BackgroundTo manage injuries effectively, players, head coaches, and medical personnel need to have excellent knowledge, attitudes, and behaviours in relation to the identification of risk factors for injuries, the implementation of injury prevention initiatives, as well as the implementation of effective injury management strategies. Understanding the injury context, whereby specific personal, environmental, and societal factors can influence the implementation of injury prevention initiatives and injury management strategies is critical to player welfare. To date, no qualitative research investigating the context of injuries, has been undertaken in elite-level womens football. The aim of our study was to explore the knowledge, attitudes, and behaviours of players, head coaches, and medical personnel in the Irish Womens National League (WNL) to injury prevention and injury management.MethodsWe used qualitative research methods to explore the knowledge, attitudes, and behaviours of players, head coaches, and medical personnel in the Irish WNL to injury prevention and injury management. Semi-structured interviews were undertaken with 17 players, 8 medical personnel, and 7 head coaches in the Irish WNL. The data were analysed using thematic analysis. Our study is located within an interpretivist, constructivist research paradigm.ResultsThe participants had incomplete knowledge of common injuries in elite-level football, and many held beliefs about risk factors for injuries, such as menstrual cycle stage, which lacked evidence to support them. Jumping and landing exercises were commonly used to reduce the risk of injuries but evidence-based injury prevention exercises and programmes such as the Nordic hamstring curl, Copenhagen adduction exercise, and the FIFA 11+ were rarely mentioned. Overall, there was dissatisfaction amongst players with their medical care and strength and conditioning (S & C) support, with resultant inadequate communication between players, head coaches, and medical personnel.ConclusionPoor quality and availability of medical care and S & C support were considered to be a major obstacle in the effective implementation of injury risk reduction strategies and successful return-to-sport practices. More original research is required in elite-level womens football to explore injury risk factors, injury prevention initiatives, and contextual return-to-sport strategies, so that players, head coaches, and medical personnel can use evidence that is both up-to-date and specific to their environment.
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| 69. |
- Hägglund, Hanna L., et al.
(författare)
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Poorer survival after out-of-hospital cardiac arrest among cancer patients : a population-based register study
- 2023
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Ingår i: European Heart Journal: Acute Cardiovascular Care. - 2048-8726 .- 2048-8734. ; 12:8, s. 495-503
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Tidskriftsartikel (refereegranskat)abstract
- Aims: The association between cancer and survival after out-of-hospital cardiac arrest (OHCA) has not been thoroughly investigated. We aimed to address this knowledge gap using national, population-based registries. Methods and results: For this study, 30 163 patients with OHCA (≥18 years) were included from the Swedish Register of Cardiopulmonary Resuscitation. Through linkage to the National Patient Registry, 2894 patients (10%) with cancer diagnosed within 5 years prior to OHCA were identified. Differences in 30-day survival between patients with cancer and controls (defined as patients with OHCA without previous cancer diagnosis) were assessed related to cancer stage (locoregional vs. metastasized cancer) and cancer site (e.g. lung cancer, breast cancer, etc.) using logistic regression adjusted for prognostic factors. Long-term survival was presented as a Kaplan-Meier curve. For locoregional cancer, no statistically significant difference in return of spontaneous circulation (ROSC) was seen compared with controls, and metastasized disease was associated with a poorer chance of ROSC. Cancer was associated with a lower 30-day survival for all cancers [adjusted odds ratio (OR) 0.57, confidence interval (CI) 0.49-0.66], locoregional cancer (adjusted OR 0.68, CI 0.57-0.82), and metastasized cancer (adjusted OR 0.24, CI 0.14-0.40) compared with controls. A lower 30-day survival compared with controls was seen for lung, gynaecological and haematological cancers. Conclusion: Cancer is associated with poorer 30-day survival after OHCA. This study suggests that cancer site and disease stage are more relevant factors than cancer in general with regard to its effect on survival after OHCA.
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| 70. |
- Hägglund, Maria, et al.
(författare)
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A New Approach for Goal-oriented Analysis of Healthcare Processes
- 2010
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Ingår i: World Congress on Medical and Health Informatics (Medinfo'10). - : IOS Press. ; 160:Pt 2, s. 1251-5
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The development of efficient e-services for patient-centered healthcare requires insight into concrete problems in administrative and clinical work processes as well as an understanding of the strategic goals that should guide these healthcare processes. However, considering both concrete process-related problems and high-level strategic goals during process analysis and solution design can be proble-matic. To address this, we propose a structured approach for analyzing both high- and low-level goals in a healthcare process and relating these to identified problems. Thereby proposed solutions for each problem in form of, e.g. e-services can be connected to strategic goals. The approach consists of five steps; process modeling; process-based problem identification and classification; process goal identification; mapping to strategic goals; and solution pro-posal. The approach is illustrated by examples from a case study of Swedish stroke care. In conclusion, the approach enables analysis of high- and low-level goals in a healthcare process by relating these to identified problems. The results thereof form a basis for redefinition of current care processes, as well as for design of supporting e-health solu-tions.
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