Dissertations / Theses: 'Pilot fatigue'

1

Smith, Benjamin L. "Pilot fatigue detection using aircraft state variables." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=5607.

Full text

Abstract:

Thesis (M.S.)--West Virginia University, 2008. Title from document title page. Document formatted into pages; contains v, 88 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 57-59).

APA, Harvard, Vancouver, ISO, and other styles

2

Guess, Gloria Michelle. "Relationship Between Cancer-Related Fatigue and Depression: A Pilot Study." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3132.

Full text

Abstract:

Abstract Fatigue is one of the most bothersome symptoms reported by patients diagnosed with cancer, and research indicates that the majority of patients receiving chemotherapy report symptoms of fatigue. Fatigue can have an effect on quality of life; therefore, it is essential that healthcare providers gain a better understanding and recognition of fatigue. Fatigue can also be a symptom of depression. Depression is another prominent symptom reported by patients diagnosed with cancer. Unfortunately, there are similarities between the symptoms of depression and fatigue making it difficult for health care providers to distinguish between the two. This study utilizes the subscale of the Hospital Anxiety and Depression Scale and the Multidimensional Fatigue Scale-Short Form to further investigate the relationship between cancer-related fatigue and depression. The convenience sample consisted of 30 chemotherapy patients being treated at an outpatient infusion center in a comprehensive cancer center in southwest Florida. All participants were between the ages of 26 and 74, and had been receiving chemotherapy for a minimum of three weeks; none had been diagnosed with chronic fatigue syndrome, or were currently being treated with radiation. The participants in the study self-rated their fatigue on a Likert-type scale of 0-10. The mean score on the self-rated fatigue scale was 4.03 (SD= 2.76). This study supports prior studies in which chemotherapy patients report mild to severe levels of fatigue. The mean score on the depression subscale of the Hospital Anxiety and Depression subscale was 4.53 (SD=4.2). A statistically significant correlation was noted between cancer-related fatigue and depression, utilizing the Hospital Anxiety and Depression subscale score and Multidimensional Fatigue Inventory-Short Form total scores (r=.676, p=.000). This study provides evidence that tools such as the Hospital Anxiety and Depression Scale and the Multidimensional Fatigue Inventory-Short Form can aid researchers and providers in distinguishing between fatigue and depression. Using these instruments in future research and practice may help avoid the overlap in symptoms of fatigue and depression. These study results support findings from previous studies indicating a moderate correlation between cancer-related fatigue and depression. This study addresses the correlation between cancer-related fatigue and depression in chemotherapy patients which may improve nursing assessment of fatigue and depression in this population. Findings suggest the need for ongoing research focusing on cancer-related fatigue and depression as well as appropriate pharmacological and non-pharmacological interventions to improve the quality of life of this patient population.

APA, Harvard, Vancouver, ISO, and other styles

3

Schneider, Jonathan James. "A pilot study of fatigue and situation awareness during simulated small satellite operations." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/105641.

Full text

Abstract:

Thesis: S.M., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2016. Cataloged from PDF version of thesis. Includes bibliographical references (pages 265-268). Fatigue is a concern as it decreases performance, increases operational risk, and generates significant annual costs. Of particular concern with small satellites is the operation of multiple robotic assets. SPHERES, a small satellite testbed, was used to examine the effects of fatigue and presence of an augmented display with situation awareness aids. All procedures were approved by the MIT Committee on the use of Humans as Experimental Subjects. Subjects (n=8) were trained on the system, then randomized to a sleep protocol order, which included 3 days of rest and 3 days of sleep deprivation. Subjects controlled two satellites in a space debris avoidance scenario. Dependent measures included survival time, strategy used, fuel usage, secondary task reaction time, and responses to a situation awareness questionnaire. An ANOVA found significant interaction effects of sleep protocol order and fatigue state on survival time (p=0.008). For these pilot data, a post-hoc test showed better performance on day two if order was rested on the first day and partially sleep deprived on the second day (p <0.05). A successful strategy to increase survival time in the space debris avoidance task was to cover a large area. An ANOVA showed an interaction effect of order and fatigue condition (p = 0.001) on the use of a correct strategy. For these pilot data, a post-hoc test showed the highest area covered on test day two if order was rested on the first day and partially sleep deprived on the second day (p <0.05). A chi-square test for independence found subjects that were partially sleep deprived on the first day received no benefit from the augmentation while subjects that were rested on the first day did receive benefit (p = 0.018). Augmentation had no significant effect on survival time. The study results suggest that a mental model was easier to develop if the subjects were rested on day one due to a better performance and use of a sound strategy on test day 2. Here the augmented display may have assisted mental model development on subjects who were rested on day 1, as it led to improved situational awareness of the satellite's system states; this ability to use the augmentation is associated with better test day 2 performance. These pilot subjects highlight that training guidelines for operating multiple robotic assets should permit appropriate rest during and after training to assist in mental model development and later superior performance. by Jonathan James Schneider. S.M.

APA, Harvard, Vancouver, ISO, and other styles

4

Hjort, Rebecka, and Satu Taipale. "Cockpit och kampen mot tröttheten : en kvalitativ intervjustudie." Thesis, Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:gih:diva-945.

Full text

Abstract:

SammanfattningSyfte och frågeställningar Det primära syftet med denna studie är att belysa hur piloter upplever att kommunikationen i cockpit påverkas av trötthet. Vårt sekundära syfte är att ge exempel på vad piloterna gör för att motverka trötthet under arbetet. <ul><li>Hur påverkas piloternas kommunikationsförmåga under trötthet? </li><li>Hur påverkas kommunikationen mellan piloterna under trötthet?</li><li>Vilka strategier använder piloterna för att minska tröttheten under flygningar; både förebyggande, livsstilsrelaterade strategier samt direkta åtgärder?</li></ul> Metod För att få en nyanserad bild av hur piloterna upplever att tröttheten påverkar kommunika-tionen dem emellan samt vilka strategier de använder sig av för att minska tröttheten under flygningen ansågs en kvalitativ ansats med semistrukturerade intervjuer vara den lämpligaste datainsamlingsmetoden. Sex intervjuer med manliga piloter mellan 31 och 37 år genom-fördes.Resultat Studiens resultat följer det nuvarande forskningsläget. Samtliga piloter upplevde att tröttheten hade en negativ inverkan på kommunikationsförmågan samt kommunikationen dem emellan. Detta leder i sin tur till missförstånd och ökar risken för olyckor. Under flygningarna finns väl utarbetade strategier som piloterna använder sig av för att bli piggare. Den främsta förebyggande strategin är planering av vila. Däremot fanns ingen tydlig fokus på kost och fysisk aktivitet.Slutsats För att öka medvetenheten, möjligheten samt motivationen till en hälsosammare livsstil med syfte att minska tröttheten under arbetet, bör ett preventivt tankesätt först och främst grund-läggas inom flygbranschen. Ett första steg dit kan vara att ta de föreslagna schema-regleringarna från SubpartQ-utvärderingen på allvar. AbstractAimThe primary aim with this study is to illustrate how communication in cockpit interacts with fatigue according to the pilots’ experience. The secondary aim with the study is to exemplify what the pilots do to prevent fatigue during work. <ul><li>What effect does fatigue have on pilots’ ability to communicate?</li><li>How does fatigue affect the communication between the pilots?</li><li>Which strategies do the pilots use in order to decrease fatigue during flights; both preventive, lifestyle-related strategies and direct actions?</li></ul> MethodTo get a nuanced picture of how fatigue affects communication and which strategies the pilots use in minimizing the effects of fatigue on communication, a qualitative method with semi-structured interviews was chosen as the most suitable method for the collection of data. Six interviews with male pilots between 31 and 37 years were carried out.ResultsThe result of this study follows the current research situation. All pilots experienced that fatigue had a negative effect on the ability to communicate and having communication between them. This leads to miscommunication and increases the risk for accidents. Established strategies during flights exist for the pilots to use in order to stay alert. The main preventive strategy is planning the rest, but no clear focus on nutrition and physical activity could be found.ConclusionsIn order to increase awareness, possibility, and motivation for a healthier lifestyle with purpose to decrease fatigue during work, should a preventive attitude first of all be implemented in aviation. A first step could be taking the suggested regulations in scheduling from the SubpartQ-evaluation seriously.

APA, Harvard, Vancouver, ISO, and other styles

5

Weir, Jeffery D. "A three phase approach to solving the bidline generation problem with an emphasis on mitigating pilot fatigue through circadian rule enforcement." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/23383.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Doyle, Ciarán. "Evaluation of a home-based walking exercise program on fatigue and health related quality of life in prostate cancer patients undergoing radiation therapy : a pilot study." Thesis, London School of Hygiene and Tropical Medicine (University of London), 2016. http://researchonline.lshtm.ac.uk/2531232/.

Full text

Abstract:

Background: Exercise could have a role in ameliorating some of the adverse effects of External Beam Radiotherapy and Androgen Deprivation Therapy (EBRT+ADT) in men with prostate cancer. The primary aim of this study was to assess the feasibility (process, resource and management) and efficacy (scientific) of a home-based moderate-to-vigorous physical activity (MVPA) walking exercise intervention for patients with localised prostate cancer (PCa) undergoing EBRT+ADT in anticipation of a future confirmatory RCT. Methods: PCa patients receiving EBRT+ADT were randomized to a home-based MVPA walking intervention (n=12) or standard care (n=12) for the duration of their EBRT. Intervention patients were prescribed 3000 steps in 30 minutes on 5 days each week, i.e. a cadence of 100 steps/minute. These 3000 steps/day were prescribed in addition to their pre-determined habitual step/day. Fatigue, health related quality of life (HRQoL), anthropometric measures and physical performance were assessed at baseline (planning CT), mid EBRT, end of EBRT, and at 1 month post EBRT. Intervention participants’ satisfaction with the intervention and barriers/facilitators to exercise during EBRT were also assessed. Control group participants’ exercise knowledge, attitudes and practices were assessed post EBRT. The feasibility of the intervention’s processes, resources and management were assessed using quantitative and qualitative methods. Results: The exercise intervention group showed greater improvements in fatigue, quality of life, anthropometric measures and physical performance compared to standard care controls. These improvements were sustained beyond the intervention period. Exercise convenience and treatment centre environment emerged as exercise facilitators. Intervention participants’ average exercise convenience and satisfaction ratings were 4.8/5 (SD=0.4) i.e. “extremely convenient” and 4.8/5 (SD=0.4) i.e. “extremely satisfied” respectively. A lack of time and poor weather emerged as exercise barriers. Standard care controls had poor exercise knowledge, attitudes and practices (KAP) post EBRT, for example only 42% of the control group were aware of the correct recommended weekly MVPA guidelines. Conclusions: This preliminary evidence suggests that a pragmatic home-based MVPA walking exercise intervention is feasible and has the potential to evoke improvements in fatigue, in addition to other important health outcomes in men with PCa undergoing EBRT+ADT. This pilot study has achieved its six feasibility criteria and should proceed to a future confirmatory RCT. Impact: This study shows for the first time that a pragmatic home-based MVPA walking exercise intervention using evidence based tailored exercise prescriptions is feasible and could have a positive impact on fatigue and other key outcomes in men with PCa receiving EBRT+ADT.

APA, Harvard, Vancouver, ISO, and other styles

7

Dos, Santos Freire Lucas M. "Synthesis of Arborescent Model Polymer Structures by Living Carbocationic Polymerization for Structure-Property Studies." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1239647738.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Naraphong, Wipasiri. "Effects of a Culturally Sensitive Exercise Program on Fatigue, Sleep, Mood, and Symptom Distress among Thai Women with Breast Cancer Receiving Adjuvant Chemotherapy: A Pilot Randomized Controlled Trial." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1368084924.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Fu, Xi. "Self-rated health and respiratory symptoms among civil aviation pilots : Occupational and non-occupational risk factors." Doctoral thesis, Uppsala universitet, Arbets- och miljömedicin, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-318806.

Full text

Abstract:

There is concern about the indoor environment in aircraft but few stud-ies exist on self-rated health (SRH) and respiratory symptoms among pilots. Occupational and non-occupational risk factors for SRH, respira-tory symptoms and other symptoms among commercial pilots were investigated in this thesis. One cohort study and one prevalence study were performed among pilots in one Scandinavian airline company. Fungal DNA, furry pet allergens and volatile organic compounds of microbial origin (MVOC) were measured on board. Cat (fel d1), dog (Can f1) and horse (Ecu cx) allergens were found in all dust samples and allergen levels were 27-75 times higher in aircraft with textile seats as compared to leather surfaces. The sum of MVOCs in the cabin air was 3.7 times higher than in homes in Uppsala and 2-methyl-1-butanol and 3-methyl-1-butanol concentrations were 15-17 times higher. Asper-gillus/Penicillium DNA and Aspergillus versicolor DNA were more common in aircraft with textile seats. One fifth reported SRH as poor or fair, 62% had fatigue, 46% overweight/obesity and 71% insomnia. Poor or fair SRH was associated with overweight/obesity, lack of exercise, insomnia, low sense of coherence (SOC) and high work demand. Re-covery from work was worse among those with insomnia and low social support at work. Fatigue was more common among young or female pilots and related to insomnia and high work demand. Pilots flying MD80 or Saab 2000 aircraft had less fatigue. Pilots exposed to environmental tobacco (ETS) on board had more eye symptoms and fatigue which were reduced after the ban of smoking (in 1997). Pilots with increased work demand developed more rhinitis, dermal symptoms and fartigue and those with decreased work control developed more eye symptoms. The incidence of doctors’ diagnosed asthma and atopy were 2.4 and 16.6 per 1000 person years, respectively. Pilots changing type of flight got more airway infections. Those reporting decreased work control had a higher incidence of atopy. Risk factors in the home environment included ETS, dampness or mould, window pane condensation in winter and living in houses built after 1975. In conclusion, SRH and respiratory health among pilots are associated with specific occupational and non-occupational risk factors.

APA, Harvard, Vancouver, ISO, and other styles

10

Scott, Joanna Louise. "The impact of international flight and varied layover length on pilots' sleep and fatigue /." Title page and abstract only, 2004. http://web4.library.adelaide.edu.au/theses/09HS/09hss4251.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Deslandes, Samuel. "Evaluation musculaire du cou et modélisation biomécanique : première estimation de la fatigue du pilote en sports mécaniques." Le Mans, 2008. http://cyberdoc.univ-lemans.fr/theses/2008/2008LEMA1010.pdf.

Full text

Abstract:

Ce travail porte sur l’évaluation de la capacité musculaire du rachis cervical en isocinétique et en isométrique. Les sports mécaniques sollicitent de façon importante le rachis cervical. Dans un cadre de prévention et d’optimisation, il apparaît nécessaire d’évaluer et de développer des protocoles de renforcement du rachis cervical. L’inexistence de module commercial adapté à cette évaluation a nécessité le développement d’un système dédié à cette étude. Ce système s’adapte sur un appareil d’isocinétisme (Biodex système 1). La mesure précise du couple produit au niveau d’une articulation nécessite l’alignement du centre de rotation de l’articulation avec l’axe de l’ergomètre. En pratique, cet alignement fait état de recommandations mais il demeure difficile d’éviter une erreur d’alignement. Pour estimer cette erreur, un modèle virtuel analytique et numérique a été proposé prenant en compte les différents paramètres tels que l’inertie, l’effet de gravité, la raideur et l’amortissement des sangles de serrage ou le coefficient de frottement entre le membre évalué et le bras de l’ergomètre. Les résultats montrent que les effets d’inertie et de gravité peuvent être négligés mais que les paramètres raideur et amortissement associés aux sangles sont à considérer au regard du couple mesuré. L’analyse du mouvement de la tête, lors d’une évaluation dans le plan frontal ou dans le plan sagittal a été réalisée à l’aide d’un système VICON à 5 caméras. Cette analyse montre une évolution du centre instantané de rotation. La prise en compte de ce paramètre impose l’acquisition du mouvement de la tête lors des évaluations permettant d’introduire un facteur de correction sur le couple mesuré. En sport automobile, les pilotes, que ce soit en course d’endurance ou en grand prix, subissent des accélérations de 3 à 4g en longitudinal et de 4 à 5g en transversal. Lors de telles accélérations, le cou est fortement sollicité et un entraînement hors circuit semble indispensable. Il est donc nécessaire d’établir une corrélation entre les sollicitations subies sur circuit et le niveau de capacité musculaire obtenu sur un appareil d’isocinétisme. Cette corrélation est établie via un logiciel de modélisation dynamique de solides (ADAMS). Le développement de cet outil permet de constituer une base caractérisant le niveau de performance par l’aptitude à la fatigue This work deals with muscular capacity of neck rachis in isokinetics and isometrics. Various activities in sport, such as motor sport, judo, wrestling, rugby, etc strongly solicit the neck rachis. In a prevention and optimisation approach, it seems necessary to assess and develop reinforcement protocols of neck rachis. Since no commercial device is found, it has been necessary to develop a specific device. The proposed device can be adapted to an isokinetics type system (Biodex system 1). In order to measure exactly the joint torque, the joint centre must be located on the ergometer axis. In practice, this is the object of recommendations but it is still difficult to avoid alignment errors. A virtual model, analytic and numeric, has been proposed to estimate the influence of various parameters such as inertia, gravity, stiffness and damping of strapping or friction between the limb and the ergometer arm when an offset occurs between the joint centre and the ergometer axis. Results show that inertia and gravity effects can be neglected, but stiffness and damping associated to strapping must be considered in comparison with the measured torque. The motion analysis of the head for a frontal or sagittal movement has been realised using a VICON system with 5 cameras. This has shown that the instantaneous centre of rotation is not fixed. Thus, the evolution of the centre of rotation must be taken into account for torque corrections. This approach has been applied in the motor sport field where the pilots, in endurance or grand prix races, may be submitted to maximum longitudinal or transversal accelerations of 3g to 4g. In such situation, the neck is strongly solicited and a specific indoor training seems necessary. Consequently, a correlation between forces felt on the track and level of muscular capacity must be established. This correlation is obtained using a multi-body dynamics software (ADAMS) also used for fatigue evaluation

APA, Harvard, Vancouver, ISO, and other styles

12

Deslandes, Samuel Mariot Jean-Pierre. "Evaluation musculaire du cou et modélisation biomécanique première estimation de la fatigue du pilote en sports mécaniques /." [S.l.] : [s.n.], 2008. http://cyberdoc.univ-lemans.fr/theses/2008/2008LEMA1010.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Gillot, Timothée. "Étude des risques de lésion du ligament croisé antérieur chez la joueuse de sports pivot Effect of fatigue on functional stability of the knee : particularities of female handball players." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMR105.

Full text

Abstract:

La lésion du ligament croisé antérieur est une atteinte sévère et fortement prévalente chez les joueuses de sports pivot (handball, basketball). Le développement des sports féminins incite à en comprendre les causes et les mécanismes. Cette thèse a pour objectif d’étudier le risque de lésion du ligament croisé antérieur de la joueuse de sport pivot et son évolution lors de l’exposition à une charge de travail. La première partie est bibliographique et expose le caractère dynamique du risque de blessure en sport. La complexité des interactions entre facteurs de risque et mécanisme lésionnel dans la lésion du LCA est présentée selon une approche épidémiologique puis biomécanique. Ces éléments mettent en valeur l’importance des facteurs de risque neuromusculaires dans la transition vers l’évènement incitatif d’une lésion du LCA. L’effet d’une charge de travail aigue sur ces facteurs est peu décrit chez les sportives pivot ce qui soulève plusieurs questions de recherche. La deuxième partie est expérimentale, avec deux études prospectives et une revue systématique de la littérature utilisant des outils d’évaluation de la force musculaire, d’analyse systématique de la littérature et de mesures de biomécaniques (cinétique, cinématique et laximétrie). Nos résultats montrent la spécificité de réponse à la fatigue isocinétique de la joueuse de handball. La cinétique de la réception de saut est la plus impactée par un protocole de fatigue neuromusculaire, les changements de direction semblant les moins modifiés. Nous identifions le caractère précoce, entre 46 et 48 ms après contact initial, de la mise en contrainte des structures activo-passives du genou lors de 766 changements de direction. Nos travaux montrent également que les joueuses abordent le changement de direction avec des amplitudes de genou compatibles avec le mécanisme lésionnel, une posture du tronc plus érigée et une vitesse angulaire de flexion de genou que nous estimons plus élevée que les hommes. La troisième partie de ce travail propose une discussion et une mise en lien de ces résultats, ainsi que leurs perspectives pour la prévention des lésions du LCA chez les joueuses de handball et basketball ACL injuries are severe and highly prevalent in female handball and basketball players. The increasing participation of women in multidirectional sports conduces to a better understand the mechanism and causes of the injury. The aim of this thesis is to investigate anterior cruciate ligament injury risk among female players in multidirectional sports and its workload-induced changes. The first part is a narrative review about the dynamic process of sports injury. Epidemiologic and biomechanic approaches were used to explain the complexity of risk factors and injury mechanism interaction. These data showed the key role of neuromuscular risk factors in building the incitative event of anterior cruciate ligament injuries. The lack of knowledge about the impact of an acute workload on those risk factors in female multidirectional sports needs to be addressed.The second part is an experimental report, including two prospective studies and a systematic review using muscular assessment, systematic tools for literature review and biomechanical analysis (kinetics, kinematics and laximetry). The results showed the specificity of female handball players when performing an isokinetic fatigue protocol. The jump landing kinetic was the most impacted by a fatigue protocol. Cutting techniques were the less impacted. The analysis of 766 side-step-cutting showed that knee joint loading is anticipated (46 to 48 ms after initial contact) in female handball and basketball players. It was also shown that women performed side-step-cutting with similar knee amplitude than the injury mechanism, a less flexed trunk position and a highest angle-velocity than men.The third part of this work proposes a discussion of those results in relation to their perspectives for the prevention of anterior cruciate ligament injury risk in female handball and basketball players

APA, Harvard, Vancouver, ISO, and other styles

14

Krapavickienė, Lina. "Sklandytojų asmeninių stresorių įtakos pilotavimo kokybei tyrimas." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2005. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2005~D_20050603_121510-45763.

Full text

Abstract:

The research of glider pilot’s flying quality influencing personal stressors Aim of the study:To estimate the personal stressors influence to the flying quality of glider pilot’s. Methods:The instantaneous analytic research using questionnaires was made during the European gliding championship. Two types of questionnaires were created in English and given for the participants (n = 90) to fill every day, 90 before the flight and 90 after. All together 1.260 questionnaires were given and 742 were returned (58.9%). Statistical analysis was made with „Statistica for Windows“ and Microsoft Excel programs. Results:Subjective pilots fatigue average increased 18.57% during the flight (stdev. 25.02%). At first fatigue increased, later decreased and at the end of the championship increased. Fatigue were increased by personal stressors, like the rest (r = 0.19, p<0.05), sleep duration (r = 0.15, p<0.05), coffee usage (r = 0.17, p<0.05). Fatigue decreased with tea usage (r = -0.19, p<0.05), short time of awake (r = -0.18, p<0.05). Most glider pilot’s noted that various health changes didn’t influence flying, but sweating importuned little. That was approved by objective measurements. Final results were determined by every day points (r = 0.57, p<0.05), pilot’s experience (r = 0.29, p<0.05), total flight time (r = 0.25, p<0.05), flight’s distance (r = 0.25, p<0.05), tea usage (r = 0.16, p<0.05), rest (r = 0.14, p<0.05). Negative influence to the results were made by sweating (r = -0.21... [to full text]

APA, Harvard, Vancouver, ISO, and other styles

15

Mawhin, Barbara. "Stratégies de protection de la performance pour la conception de cockpits résilients : le cas de la fatigue en situation inattendue de résolution de problème." Thesis, Paris 5, 2013. http://www.theses.fr/2013PA05H122.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Celestino, Victor Rafael Rezende. "Fadiga no trabalho de pilotos: uma psicologia sistêmica da aviação civil." Universidade Católica de Brasília, 2017. https://bdtd.ucb.br:8443/jspui/handle/tede/2423.

Full text

Abstract:

Submitted by Sara Ribeiro (sara.ribeiro@ucb.br) on 2018-07-06T13:28:02Z No. of bitstreams: 1 VictorRafaelRezendeCelestinoTese2017.pdf: 3658797 bytes, checksum: 8acc66f10fe49e0337ff75e72cd99660 (MD5) Approved for entry into archive by Sara Ribeiro (sara.ribeiro@ucb.br) on 2018-07-06T13:29:02Z (GMT) No. of bitstreams: 1 VictorRafaelRezendeCelestinoTese2017.pdf: 3658797 bytes, checksum: 8acc66f10fe49e0337ff75e72cd99660 (MD5) Made available in DSpace on 2018-07-06T13:29:02Z (GMT). No. of bitstreams: 1 VictorRafaelRezendeCelestinoTese2017.pdf: 3658797 bytes, checksum: 8acc66f10fe49e0337ff75e72cd99660 (MD5) Previous issue date: 2017-11-29 The overall objective of the research was to investigate validity evidences of fatigue measure at work of civil aviation pilots by means of the feeling of fatigue scale, adherent to the systemic approach of psychology. Feeling of fatigue is an emotion associated with a psychophysiological state of fatigue. In addition to this, the specific objectives were: to propose and evaluate a methodological adaptation for data and methods triangulation in an integrative review; to contrast and reorganize the knowledge about the subjective measurement of fatigue at work; and to introduce a proposal for systemic aviation psychology, in order to contribute to the mitigation of human fatigue risk. This thesis was developed in the model format of a collection of articles. From the perspective that the systemic psychology research occurs in interdisciplinary context, and it contrasts globally, this work proposes an innovative methodology of triangulation to synthesize and discuss the available knowledge on the subject. This methodology is applied in an integrative review to synthesize qualitative and quantitative convergent data, among workers subject to work in shifts in order to reorganize the knowledge about the measure of fatigue with the feeling of fatigue scale. The results include a systemic meta-model of the phenomenon of fatigue and showed the psychometric validity of the scale. Then, the work describes the prevalence of fatigue at work among Brazilian civil aviation pilots, and demonstrates the validity of the feeling of fatigue scale in this context, from the perspective of systemic psychology. In order to do this, a crosssectional type study was conducted, in a sample of 1,066 Brazilian airline pilots. The results showed the psychometric validity of the scale, suggesting a prevalence of fatigue at work of Brazilian airline pilots of 59.4% (female) and 64.1% (male), with an average of fatigue at work above a cut-off that would define workers as fatigued. Finally, the systemic perspective suggests that one cannot reduce the causes of fatigue, being necessary to consider the context and the systemic mediation of symptoms associated. The study confirms that, in civil aviation, the feeling of fatigue is a valid measure of the nature and the level of fatigue at work, which can be assessed (screening) by means of the scale. O objetivo geral da pesquisa foi investigar as evidências de validade da medida da fadiga no trabalho dos pilotos da aviação civil, por meio da escala de sentimento de fadiga, aderente à abordagem sistêmica da psicologia. O sentimento de fadiga é uma emoção associada a um estado psicofisiológico de fadiga. Além desse, os objetivos específicos foram: propor e avaliar uma adaptação metodológica para triangulação de dados e métodos em uma revisão integrativa; contrastar e reorganizar o conhecimento sobre a mensuração subjetiva da fadiga no trabalho; e introduzir uma proposta de psicologia sistêmica da aviação, a fim de contribuir para a mitigação do risco de fadiga humana. Esta tese foi desenvolvida no formato do modelo de coletânea de artigos. A partir da perspectiva de que a pesquisa em psicologia sistêmica ocorre em contexto interdisciplinar e se contrasta globalmente, propõe-se uma metodologia inovadora de triangulação para sintetizar e discutir o conhecimento disponível sobre o tema. Essa metodologia é aplicada em uma revisão integrativa para sintetizar dados qualitativos e quantitativos convergentes, entre trabalhadores sujeitos ao trabalho em turnos, de forma a reorganizar o conhecimento sobre a medida da fadiga com a escala de sentimento de fadiga. Os resultados permitiram construir um meta-modelo sistêmico explicativo do fenômeno da fadiga e evidenciaram a validade psicométrica da escala. Em seguida, o trabalho descreve a prevalência de fadiga no trabalho entre pilotos da aviação civil brasileira e demonstra a validade da escala de sentimento de fadiga naquele contexto, a partir da perspectiva da psicologia sistêmica. Para isso, foi realizado um estudo do tipo observacional transversal, em uma amostra de 1.066 pilotos de empresas aéreas brasileiras. Os resultados evidenciaram a validade psicométrica da escala, sugerindo uma prevalência da fadiga no trabalho dos pilotos de empresas aéreas brasileiras de 59,4% (feminino) e 64,1% (masculino), com uma média da fadiga no trabalho acima de um ponto de corte que definiria os trabalhadores como fatigados. Finalmente, a perspectiva sistêmica sugere que não se pode reduzir as causas da fadiga, sendo necessário considerar a mediação do contexto e o interrelacionamento sistêmico dos sintomas associados. O estudo confirma que, na aviação civil, a escala de sentimento de fadiga é uma medida válida da natureza e do nível da fadiga no trabalho, que pode ser avaliada (screening) por meio da escala.

APA, Harvard, Vancouver, ISO, and other styles

17

Liang, Yun-Ling, and 梁筠翎. "Research on Pilot Fatigue." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/44348655629265967282.

Full text

Abstract:

碩士 國立臺灣大學 土木工程學研究所 94 Pilot fatigue plays an important role in the flight safety. Except for the flight schedule, work hours and flying time may be other factors to lead to the fatigue. Actually, one of the important factors of that is the condition at work and rest period. For this reason, this study not only considers the cause, influence and countermeasures of pilot fatigue but also combines the different opinion of interview with pilots. After summarizing different kinds of studies, the goal of this study considers the condition at the work and rest period to analyze the issues of pilot fatigue. The rest order in the duty is always decided by the captain. But the crewmembers have the different physiology condition and the different fatigue feelings. This study considers the diverse factors such as the duty time, the pre-duty sleep time, the quality of sleep and so on. This analysis attempts to use the characteristics of work and rest period to establish a set of napping probability model with Logistic Regression Model and Gray System Theory. By this way, pilot could use this model to predict the probability of nap at different time range of duty. Hence, based on the objective standard, they could arrange the order of rest in the duty to reduce the fatal influence from fatigue. In order to provide pilot an easy, convenient and practical rest order suggestion, this study establishs a web about pilot fatige. Before being at the duty time, pilot could use it to obtain objective rest order to reduce the influence of fatigue, and then it provides a better and safer flight.

APA, Harvard, Vancouver, ISO, and other styles

18

"Factors Contributing to Self-Reported Student Pilot Fatigue." Master's thesis, 2019. http://hdl.handle.net/2286/R.I.53810.

Full text

Abstract:

abstract: Student pilots are the future of aviation and one of the biggest problems that they face as new pilots is fatigue. The survey was sent out asking if student pilots were fatigued, if they attribute flight training, school work, work outside of school, and social obligations to their sleep loss, and how they spend their time on those activities. The survey was given to aviation students at Arizona State University (ASU) Polytechnic Campus. ASU student pilots were found to be fatigued through a single sample t-test. Other t-tests were done on each of the questions that asked student pilots how flight training, school work, work outside of school and social obligations affect their sleep loss. Flight training and school were found to be contributing to student pilots sleep loss. Work outside of school and social obligations were found to not be contributing to student pilots sleep loss. It was found that student pilots’ tendency to use a planner or calendar was found to not be significant. Along with this planning through the week when they will do assignments or study for exams was also not found to be significant. Students making lists of assignments and when they are due was also found to not be significant. The t-test also found that student pilots are neutral on the topic of whether good time management skills would help increase the amount of sleep that they get. Dissertation/Thesis Masters Thesis Technology 2019

APA, Harvard, Vancouver, ISO, and other styles

19

Yang, Hsuan, and 楊玄. "Analyzing pilot fatigue using the structural equation modeling." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/82822855564901039789.

Full text

Abstract:

碩士 國立臺灣海洋大學 航運管理學系 94 Flight fatigue is one of the key factors that affect flight safety. Cockpit crew of oceanic services with flight time of more than six hours experience sleep-loss and circadian rhythm disruption. Crew of short-haul services with flight time of less than two hours suffer from early departures, late finishes, and intensive takeoff and landing procedures that are workload demanding. Quantitative research is limited with respect to flight fatigue issues in Taiwan. The present research employed a structural equation modeling approach to conduct a path analysis and to identify the relationships among mental and physical fatigue, before and after flight duty. The empirical study indicated that for oceanic crew mental fatigue (MF) before flight duty influenced MF after flight duty. MF after flight duty also influenced physical fatigue (PF) after flight duty. For regional operations (flight time between two and six hours), PF after flight duty is influenced by PF before flight duty and MF after duty is influenced by PF after duty. With respect to short-haul flights, MF after flight duty is influenced by MF before flight duty, PF after flight duty is influenced by both PF before flight duty and MF after flight duty.

APA, Harvard, Vancouver, ISO, and other styles

20

SHEN, ER-WEN, and 沈爾雯. "Factors Contributing To The Risk Of Airline Pilot Fatigue." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/98t5sz.

Full text

Abstract:

碩士 開南大學 觀光運輸學院碩士班 107 Fatigue is one of the factors affecting the safety of flight. In the 24-hour working environment of the aviation industry, the fatigue of the first-line personnel will seriously affect the safety of flight. Fatigue has a great impact on the safety of flying, and it is often impossible to accurately measure the degree of fatigue and the impact, and is often overlooked by the driver. Compared with foreign literature or research, there are few quantitative studies on the driving fatigue characteristics of flying in China. Therefore, this study aims to explore the degree of fatigue of civil aviation pilots of national aviation pilots and the possible causes of fatigue. This study investigates the investigation and analysis of the fatigue risk of civil aviation pilots. The main objectives are as follows: 1. Understand the general situation of the national aviation pilot, 2. Explor the fatigue of the national pilot, 3. Explor the possible causes of the fatigue of the nationality pilot, 4 According to the research results and recommendations, the relevant units can understand the current situation of the pilots as a reference for improving the domestic driving fatigue problem. The research method of this study uses the questionnaire survey method as the basis for data collection. It is mainly based on national airline pilots, including the Republic of China nationality and foreign pilots. It uses a self-administered structure questionnaire, which explains the research purpose and conducts a questionnaire survey. 526 copies of valid questionnaires were collected. According to the literature discussion and the questionnaires used in domestic related research, the Personal Fatigue Intensity Scale (CIS) was used to analyze the data using SPSS14.0 statistical software. In order to understand whether the degree of fatigue of subjective fatigue, work motivation, attention and activity is different, it is expected that the scale of this study will allow the pilot to assess the degree of self-fatigue and see if there is any fatigue-free group. The acumen of the self-health problem, in order to avoid fatigue and the impact of flight safety, to provide reference for advanced aviation industry.

APA, Harvard, Vancouver, ISO, and other styles

21

LU, WEN-JUI, and 盧文瑞. "The Pilot Study on Anti-Fatigue Activities of Rhodiola Rosea Extracts." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/76416969113522667233.

Full text

Abstract:

碩士 國立體育大學 運動與健康科學學院 104 Rhodiola rosea is one of the most famous medicinal herbs to fight against physical fatigue and has been purported to possess ergogenic properties. The purpose of this study is to evaluate whether the extracts of Rhodiola rosea is able to ameliorate the condition of physical fatigue, the effectiveness of performance enhancement, or anti-fatigue functions. We used ICR mice model to evaluate how the extract of Rhodiola rosea affect the physical fatigues, as well as to assess the relevant physiological and biochemical indices. A total of 15 male ICR mice were direved into three group (5 mice/group): (1) the control group without treatment, the treatment group with a dosage of the extracts of Rhodiola rosea (RE-1X), and the treatment group with double dosage of the extracts of Rhodiola rosea (RE-2X). After four weeks, all mice were tested for exercise performance and anti-fatigue functions, including forelimb grip strength, endurance performance in a 5% body weight-loaded swimming test, and serum levels of lactate, ammonia, glucose, urea nitrogen concentration, and creatine kinase after a 15-min exercise challenge. Results showed that RE-treated animals have a significant increase in grip strength and endurance swimming performance, and both in a dose-depend manner. In addition, RE-treated mice have a significant reduction of fatigue- or muscle injury-associated biomarkers: serum lactate, ammonia, and CK levels post an acute exercise challenge. In conclusion, our data confirmed that the extracts of Rhodiola rosea has a great potential as an ergogenic aid.

APA, Harvard, Vancouver, ISO, and other styles

22

(8784560), Aaron Zhen Yang Teo. "AN ANALYSIS OF COLLEGIATE AVIATION PILOTS AND FATIGUE." Thesis, 2020.

Find full text

Abstract:

Flying an airplane is a complex operation. Pilots must be able to manipulate the three-dimensional flight characteristics, maintain situational awareness, aircraft configurations, interpret charts, and handle communications with air traffic control. This requires maximum cognitive and psychomotor skills. The National Transportation Safety Board (NTSB) has added reducing fatigue-related accidents is on their top ten most wanted list. According to the NTSB (2019), fatigue “degrades a person’s ability to stay awake, alert, and attentive to the demands of safely controlling a vehicle, vessel, aircraft, or train” (p.18). Additionally, the Federal Aviation Administration (FAA) has called on stakeholders, including the academic community, to reduce the number of accidents in the general aviation sector (Federal Aviation Administration, 2018). After a review of extant literature, most fatigue research in aviation pertains to airline and military operations (Keller, Mendonca, & Cutter, 2019; Levin, Mendonca, Keller, & Teo, 2019; Mendonca, Keller, Lu, 2019). However, collegiate aviation students have differences such as class scheduling, maturity, and regulations. Thus, making collegiate aviation pilots a unique population. Therefore, the purpose of this study was threefold: 1) To investigate the causes and symptoms of fatigue among collegiate aviation students. 2) To investigate whether there is a statistically significant association between enrollment status and a participant’s willingness to fly fatigued. 3) To investigate whether a participant’s age and flight hours predict their willingness to fly while fatigued. The researcher used a mixed-methods online-based survey to answer the research questions. The researcher used convenience and judgment sampling to distribute the survey to eight collegiate aviation programs in the United States. A total of 248 (n = 248) participants participated in the survey. The results of the survey indicated that participants cited excessive workload, stress, and sleep-related issues (disturbances and poor quantity) as the most common causes of fatigue. Participants cited drowsiness, loss of concentration, and physical/mental discomfort, including irritation, as symptoms of fatigue. The results also indicated that there was a statistically significant association between enrollment status and a participant’s willingness to fly while fatigued; students from higher enrollment statuses are more willing to fly fatigued. Lastly, the results indicated that age might be used as a predictor for a participant’s willingness to fly while fatigued. Conversely, flight hours cannot be used as a predictor for a participant’s willingness to fly while fatigued.

APA, Harvard, Vancouver, ISO, and other styles

23

Wei, Yin-Hsuan, and 魏吟亘. "Relationship between Occupational Fatigue and Heart Rate Variability-A Pilot Study in High-Tech Company." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/g4uzgc.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

"A Pilot Study of Online Yoga to Improve Fatigue and Quality of Life in Myeloproliferative Neoplasm Patients." Master's thesis, 2017. http://hdl.handle.net/2286/R.I.45588.

Full text

Abstract:

abstract: Myeloproliferative neoplasm (MPN) patients suffer from fatigue and a reduced overall quality of life, both of which are not resolved with current pharmacologic therapy. The purpose of this study was to examine the effects of a 12-week online-streamed yoga intervention on fatigue and QoL in MPN patients as compared to a wait-list control group as well as to determine the feasibility of remotely collecting blood and saliva samples in a national sample. MPN patients were asked to complete 60 min/week of online yoga for 12 weeks. MPN fatigue and QoL were assessed online with single-item questions taken from the MPN SAF (fatigue and QoL) and NIH PROMIS (QoL) at baseline, week 7, and week 12. The practicality of the blood and saliva measures were defined as >70% completion rate at both baseline and week 12. Fidelity of the intervention (i.e., weekly yoga participation) was assessed via both self-report (i.e., daily log) and objective measurement (i.e., Clicky). Of the 62 MPN patients that enrolled in the study, 48 completed the intervention with 27 participating in the yoga group and 21 participating in the wait-list control group. Weekly yoga participation averaged ~41 min/week as measured objectively, whereas self-report yoga participation averaged ~56 min/week. The blood draw was determined to be practical with a 92.6% completion rate at baseline and a 70.4% completion rate at week 12. There were no significant differences from baseline to week 12 in MPN SAF fatigue (ES=0.18; p=0.724) or MPN SAF QoL (ES=-0.53; p=0.19), however, NIH PROMIS QoL was significantly improved from baseline to week 12 (ES=0.7; p=0.031) when compared to the control group. This study builds upon the findings from a prior feasibility study in demonstrating the feasibility of online yoga as well as its preliminary effects of improving total symptom burden, fatigue, pain, depression, anxiety, and sleep disturbance in MPN patients. Given the effects of yoga demonstrated both in the feasibility study and the current pilot study, a future randomized controlled trial with a larger sample size is warranted in order to further investigate the effectiveness of online yoga for MPN patient symptom burden and QoL. Dissertation/Thesis Masters Thesis Exercise and Wellness 2017

APA, Harvard, Vancouver, ISO, and other styles

25

Zhou, Yihui. "A pilot experimental study on the low cycle fatigue behavior of stainless steel rebars for earthquake engineering applications." 2008. http://proquest.umi.com/pqdweb?did=1588783501&sid=4&Fmt=2&clientId=39334&RQT=309&VName=PQD.

Full text

Abstract:

Thesis (M.S.)--State University of New York at Buffalo, 2008. Title from PDF title page (viewed on Jan. 29, 2009) Available through UMI ProQuest Digital Dissertations. Thesis adviser: Lee, George C., Chen, Stuart S. Includes bibliographical references.

APA, Harvard, Vancouver, ISO, and other styles

26

Caron, Gabriel. "Les effets d’un effort cognitif prolongé chez des athlètes ayant subi une commotion cérébrale." Thesis, 2020. http://hdl.handle.net/1866/24391.

Full text

Abstract:

La fatigue est l’un des symptômes les plus fréquents et persistants chez les victimes de commotion cérébrale. Au cours des dernières années, des signes d’altérations cognitives post-commotionnelles à la suite d’un effort aérobie, soit une forme de fatigue dont la cause est physique plus que cognitive, ont été trouvés à court et à long terme chez des athlètes étudiants. Or, puisque ces athlètes évoluent dans un contexte où ils doivent non seulement performer dans leur discipline sportive, mais aussi à l’école ou au travail, il convient de se demander si un effort mental soutenu n’aurait pas le même effet chez cette population. L’objectif de cette étude était donc de déterminer si des athlètes étudiants ayant subi une commotion cérébrale (groupe HC) se sentent plus fatigués ou ont davantage tendance à se fatiguer mentalement que ceux n’ayant jamais subi de commotion cérébrale (groupe ST). Les sujets devaient répondre à une série de questionnaires auto-rapportés. Ils devaient aussi compléter une tâche informatisée recrutant les fonctions exécutives avant et après avoir répondu à une épreuve de raisonnement, d’une durée d’une heure, visant à simuler un examen scolaire. Leur réaction physiologique à la tâche était mesurée via un appareil d’électroencéphalographie et un cardiofréquencemètre. Si dans l’ensemble les résultats n’appuient pas l’hypothèse initiale, les deux groupes ont montré des différences notables dans leur façon de répondre à la tâche. Nous avons notamment constaté l’absence d’un effet de pratique à la condition la plus facile ainsi qu’une variabilité de la performance généralement plus élevée chez les sujets avec un historique de commotion cérébrale. De plus, contrairement au groupe témoin, ceux qui rapportaient des symptômes plus importants de fatigue cognitive quotidienne, de somnolence et de dépression montraient également une moins bonne précision à la tâche après un effort cognitif soutenu. Ces résultats suggèrent que les commotions cérébrales pourraient avoir pour effet d’accroître la sensibilité de certains individus à l’effort cognitif. De futures études devraient se pencher sur cette relation afin de la confirmer et d’en comprendre les causes. Fatigue is one of the most common and persistent symptoms in concussion victims. In recent years, signs of post-concussive cognitive impairment following aerobic exertion, a form of fatigue whose cause is more physical than cognitive, have been found in both shortand long-term in student athletes. However, since these athletes evolve in a context where they must not only perform in their sport, but also at school or at work, it is worth asking whether sustained mental effort would have the same effect in this population. The objective of this study was therefore to determine whether student athletes who have suffered a concussion (HC group) feel more tired or are more likely to become mentally fatigued than those who have never suffered a concussion (ST group). Subjects were asked to complete a series of self-report questionnaires. They were also required to complete a computerized task recruiting executive functions before and after completing a one-hour reasoning test meant to simulate a school examination. Their physiological response to the task was measured using electroencephalography and a heart rate monitor. While the results do not support the original hypothesis, the groups showed significant differences in the way they responded to the task. Particularly, we found the absence of a practice effect at the easiest condition as well as a generally higher performance variability in subjects with a history of concussion. In addition, unlike the control group, those who reported greater symptoms of daily cognitive fatigue, drowsiness and depression also showed poorer task accuracy after sustained cognitive effort. These results suggest that concussions may have the effect of increasing the sensitivity of some individuals to cognitive effort. Future studies should investigate this relationship in order to confirm it and understand its causes.

APA, Harvard, Vancouver, ISO, and other styles

27

Caetano, Diogo Alexandre Santos. "Corrosion resistance of diamond-like carbon coated rotary endodontic instruments - pilot study." Master's thesis, 2018. http://hdl.handle.net/10316/81789.

Full text

Abstract:

Trabalho Final do Mestrado Integrado em Medicina Dentária apresentado à Faculdade de Medicina Objetivo: Este estudo pretende avaliar se um revestimento de diamond-like carbon em limas endodônticas mecanizadas de Níquel-Titânio (Hyflex CM, Hyflex EDM and Reciproc Blue) tem um efeito protetor da superfície contra corrosão por contacto com hipoclorito de sódio (NaOCl).Materiais e métodos: Um total de 12 limas foram divididas em 6 grupos: 2 limas Hyflex CM, 2 Hyflex EDM, 2 Reciproc Blue, 2 Hyflex CM com revestimento DLC, 2 Hyflex EDM com revestimento DLC e 2 Reciproc Blue com revestimento DLC. Uma lima de cada grupo foi sujeita a dois protocolos de imersão em NaOCl com análise de superfície através de microscopia eletrónica de varrimento realizada após o primeiro e previamente ao segundo protocolo. A segunda lima do grupo foi mantida tal como fornecida pelo fabricante. No primeiro protocolo de imersão, cada lima foi dinamicamente imersa durante 5 minutos em 4 ml de hipoclorito a 6% e a uma temperatura de 37ºC. De seguida, a lima foi retirada e dinamicamente imersa em água destilada durante 1 minuto, com secagem posterior. Após a análise de superfície, as limas foram sujeitas ao segundo protocolo de imersão, no qual foram imersas em hipoclorito a 6% e retiradas imediatamente a seguir. Posteriormente, foram colocadas num suporte sem qualquer manipulação durante 1 hora, após a qual foram lavadas com água destilada e posterior secagem. Todas as limas foram novamente analisadas através de microscopia eletrónica de varrimento. Adicionalmente, duas limas (Hyflex EDM com e sem revestimento DLC) foram sujeitas a fadiga cíclica num dispositivo especificamente desenvolvido para o efeito.Resultados: A lima Hyflex CM mostrou uma textura de superfície uniforme com marcas de maquinação visíveis, tendo essa textura sido mantida após o revestimento de superfície com DLC. Após o segundo protocolo de imersão, a lima deste sistema com revestimento mostrou perda de DLC na superfície de corte da mesma. Relativamente ao sistema Hyflex EDM, a distinção mais notável foi uma suavização do relevo na porção interna da hélice das limas após o revestimento. A análise de superfície do sistema Reciproc Blue mostrou uma textura de superfície uniforme com máquinas de maquinação, tendo também o relevo da superfície sido mantido após a adição do revestimento de DLC, tendo este também demostrado sinais de resistência aos protocolos de imersão em hipoclorito visto não se ter verificado perdas de material em nenhuma das observações. O teste de resistência à fadiga cíclica revelou sinais de desgaste na aresta de corte da lima do sistema Hyflex EDM sem revestimento e perda significativa de material de revestimento na porção interna da hélice da lima revestida, ainda que a aresta de corte permanecesse mais integra (também esta com perda de material de revestimento).Conclusões: Os resultados do presente estudo sugerem que não se verifica uma diferença apreciável entre limas revestidas e não revestidas com diamond-like carbon no que concerne à resistência à corrosão decorrente do contacto destes instrumentos com hipoclorito de sódio. Aim: The purpose of this study was to determine if a diamond-like carbon (DLC) coating in NiTi alloy engine-driven endodontic files (Hyflex CM, Hyflex EDM and Reciproc Blue) can protect the surface against sodium hypochlorite (NaOCl) driven corrosion.Materials and Methods: A total of 12 files were split in six groups: 2 Hyflex CM files (size 25, .06 taper, 25 mm), 2 Hyflex EDM files (size 25/~ OneFile, 25mm), 2 Reciproc Blue files, 2 Hyflex CM (size 25, .06 taper, 25 mm) files with DLC coating, 2 Hyflex EDM files (size 25/~ OneFile, 25mm) with DLC coating and 2 Reciproc Blue files with DLC coating. One file from each group was subject to two NaOCl immersion protocols, with surface analysis performed in between through scanning electron microscopy (SEM), and the other was left untouched as received by the company. In the first experimental NaOCl protocol, files were dynamically immersed for 5 minutes in 4 ml of 6% sodium hypochlorite solution at 37 ºC. Subsequently, files were immediately submitted to dynamic immersion in distilled water for 1 minute and air dried. Following SEM, in a second immersion protocol, the previously immersed files were briefly immersed in 4 ml of 6% sodium hypochlorite solution, immediately removed, and left untouched for 1 hour, after which all files were rinsed with distilled water and air dried. All files were observed in SEM. Additionally, two files (Hyflex EDM with and without DLC coating) were submitted to cyclic fatigue in a specifically developed device.Results: Uncoated Hyflex CM file showed a uniform texture with machining grooves, preserved after coating, and loss of DLC coating material on the cutting edge of the instrument after the second immersion protocol, while with the Hyflex EDM system the main noticeable change was in the coated EDM file which revealed a less pronounced texture, with the pits, pores and voids in the inner section of the coil having a smoother relief. Surface analysis of uncoated Reciproc Blue revealed a uniform texture with machining grooves, also preserved by DLC coating, and no signs of failure to resist the immersion protocol in both observations. Cyclic fatigue resistance testing showed signs of wear on the cutting edge of the Hyflex EDM uncoated instrument and extensive loss of coating on the inner section of the coil of the DLC coated file with the edge appearing to be better preserved in the latter.Conclusions: Our findings suggest there’s no difference concerning sodium hypochlorite driven corrosion resistance among files with diamond-like carbon coating or in its original surface.

APA, Harvard, Vancouver, ISO, and other styles

28

Teixeira, Carlos. "HELICOPTER PILOT ROSTERING ON/OFF SCHEDULE SCHEME IN ANGOLA OIL AND GAS OFFSHORE INDUSTRY." Master's thesis, 2020. http://hdl.handle.net/10400.26/35457.

Full text

Abstract:

Na indústria de petróleo e gás, os trabalhadores são transportados principalmente por helicóptero de terra para/de alto mar. O trabalho varia de 45 a 90 minutos de tempo de voo para cada segmento de perna. Com uma atividade de rotina onde o período de carga de trabalho das tripulações de voo muitas vezes varia, até 12 horas de período de serviço e um máximo de 8 horas de voo. Durante os voos, os pilotos são expostos a diversas condições de trabalho que causam fadiga física e psicológica. Este estudo de pesquisa tem como objetivo avaliar a exposição de pilotos de helicóptero à vibração de corpo inteiro (VCI) e ao ruído sonoro como principal causa de fadiga e a idade como factor secundário. No sentido de cumprir com o objetivo do estudo de investigação, foi seleccionada, oportunisticamente, uma amostra dimensional de 50 pilotos, de uma população situada no país de Angola, sendo uma do sexo feminino e 49 do sexo masculino. É uma amostra não probabilística de conveniência composta por uma única empresa. A metodologia empregue foi uma questionario voluntário online. Realizado por meio de um estudo correlacional com delineamento transversal realizado online e foi compilado a partir de diversas questões relacionadas aos factores humanos. Em termos de resultados, o autor gostaria de enfatizar a exposição de outros efeitos externos que também teriam contribuído para o cansaço dos pilotos. No entanto, para este estudo, eles foram negligenciados. Os dados recolhidos foram utilizados para desenvolver a análise do melhor esquema de escala de serviço nos operadores aéreos de helicopteros de suporte à industria petroliferica de óleo e gas. Participantes forma pilotos de helicoperos, 97% eram do sexo masculino, 63% com idade inferior a 40 anos, 71% copilotos, 63% tinham licença de piloto comercial e 58% com menos de dez anos de experiência. Escala de rotação de serviço, quando combinados quase 75% consideraram o melhor esquema de rotação entre 21 a 28 dias de serviço (ON) / folga (off). Fadiga afetada o desempenho e alerta degradada relatado por mais de 56%. Acenando ocasionalmente durante o voo a cabeça em 34,8%, mas apenas 21,7% recusaram um voo devido à fadiga. In the oil and gas industry, workers are mainly transported by helicopter from Onshore to/from Offshore. The travel varies between 45 to 90 minutes of flight time for each leg segment. Under a routine activity, the flight crews workload period often varies up to 12 hours of duty period and a maximum of 8 hours flying. During flight missions, pilots are exposed to several work-related conditions that cause physical and psychological fatigue. Accordingly, this research study aims to evaluate the exposure of helicopter pilots towards whole-body vibration (WBV) and noise as the leading cause of fatigue and age as the secondary factor. In the direction of fulfilling the research study goal, a sample size of 50 pilots were opportunistically selected, from a population working in Luanda, Angola; being one Female and 49 Males. The study is non-probabilistic with a convenience sampling composed of a single company. The methodology employed was a voluntary online survey, accomplished by a correlational study with a cross-sectional design conducted online and was compiled of several questions related to human factors. In terms of results, the author would like to emphasize the exposure of other external effects impacting the pilot's fatigue; however, for this study, these contributing factors were neglected. The data collected were utilized to develop the analysis of the most effective roster scheme in the helicopter offshore service provider. Looking at the pilot demographics, 97% were male, 63% with age below 40 years, 71% copilots, 63% have a commercial pilot license, and 58% with less than ten years of experience. Schedule Schemes and Rostering, when combined almost 75% considered best rostering scheme between 21 to 28 days on/off. The study highlights the fact that fatigue affects and degrades performance and alertness as reported by more than 56 %. Occasionally nodding during flight by 34.8%; however, only 21.7% turned down a flight due to fatigue.

APA, Harvard, Vancouver, ISO, and other styles

29

Chen, Hsin-Hao, and 陳信豪. "Analyzing the Flight Fatigue Factors of Helicopter Pilots." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/11544563732907787307.

Full text

Abstract:

碩士 國立臺灣海洋大學 航運管理學系 92 Abstract Though flight fatigue is one of the major factors that contribute to aviation accidents, research related to quantitative measures of flight fatigue is limited in Taiwan. The present research focuses on this topic and investigates the problem of helicopter crew fatigue. While the specific performance features of helicopters make pilots be able to conduct tasks that can not be done by fix-wing aircraft, those special operations are causes of high workload. High workload causes serious flight fatigue, decreases pilots’ performances, and might be the reason of relatively high helicopter accident rate in Taiwan. This study uses survey research of questionnaires, and examines helicopter pilots in Taiwan by questionnaires. According to the survey data, we can find some conclusions. Pilots consider that cruse is the phase most affected by fatigue because of Visual Flight Rules. The finding also indicates that pilots’ sleeping-efficiency becomes better on pre-trip day than on off-duty days. Pilots adjust their best conditions to face the challenges. Pilots still feel fatigue after completing tasks, because helicopter cockpit is much more uncomfortable than fix-wing aircraft. The symptoms of fatigue include backache, changing of posture, growing need to sleep and headache etc. Flight fatigue is notable for airlines and the authorities concerned. Key words：Flight fatigue、Helicopter、Flight safety

APA, Harvard, Vancouver, ISO, and other styles

30

Loh, Sylvia. "Flight crew fatigue in Australian short-haul operations and methodologies for assessing fatigue in-flight." 2004. http://arrow.unisa.edu.au:8081/1959.8/24975.

Full text

Abstract:

The focus of this thesis is fatigue in aviation. It presents a detailed analysis of subjective fatigue and sleep patterns in short-haul operations. This operation was chosen because short-haul rosters encompass a range of scheduling factors that have been identified in the shiftwork literature as having a negative impact on alertness and performance. It is contended that studies examining these factors in the commercial aviation industry are scarce, and of those available, limited to investigations conducted outside of Australia. In addition, this thesis addresses a methodological limitation that has, to date, restricted the ability to measure fatigue during flight. It is contended that the scarcity of in-flight studies stems from the lack of a suitable performance test for measuring fatigue in time-constrained operating environments, such as aviation. The studies presented in this thesis are divided into two sections. The first section comprises three aviation studies conducted in Qantas airlines. The first two aviation studies examined the effects of scheduling factors on the subjective fatigue of flight crew employed by Qantas airlines. Two different populations were examined: B767 and B737 flight crew. Participants rated their fatigue and recorded information about their flying patterns for a minimum of 15 days. The results indicated that flight crew experienced mild to moderate fatigue in relation to their work. Importantly, different scheduling factors contributed to fatigue, including length of the flight duty period, number of flying hours, and duty start times. The third aviation study examined the sleep of B737 flight crew across a 3-day schedule. Sleep quantity and quality were determined from a sleep diary and wrist actigraphy data. The results indicated that sleep offset time, sleep duration, and sleep quality significantly varied across the schedule. In addition, early morning start times and late evening end times were key factors contributing to reduced sleep. The second section of this thesis comprises two laboratory studies that assessed the sensitivity of a brief (i.e. less than 10 minutes) psychomotor vigilance task (PVT) to the effects of sleep loss. A preliminary study compared performance during the 10-minute PVT with performance during the first half of the PVT during a night of wakefulness (23:00 ? 07:00 hours). A subsequent study compared performance during a 10-minute PVT with performance during a 90-second PVT and a 5-minute PVT during 28 hours of sustained wakefulness. The findings of the latter study indicated that performance during the 5-minute PVT and the 90-second PVT deteriorated in a manner similar to that observed during the standard 10-minute PVT. However, in line with the findings reported in the preliminary study, the shorter the task sampling time, the less sensitive the test to response slowing and performance variability. Based on these findings, it was surmised that a 5-minute PVT is likely to provide a more accurate measure of performance impairment than a test of shorter duration. Moreover, it was proposed that a 5-minute PVT may provide researchers with a reliable test for assessing changes in performance. In summary, the results of the aviation studies indicate that a number of scheduling factors contribute to fatigue and disturbed sleep in Australian domestic operations. The findings of this thesis are of particular concern, given that current aviation regulations do not fully consider the extent to which scheduling demands affect flight crew. It is apparent that flight crew would benefit from the incorporation of such findings into duty and rest limitations and scheduling procedures. Evidence demonstrating that (1) fatigue accumulates across the flight duty period, and (2) flight crew are at particular risk of higher fatigue when they are rostered to work an early morning duty suggests that the length of the flight duty period, the number of sectors worked and the timing of the duty period warrant particular attention. Finally, the results of the laboratory studies hold particular promise for future research, since they suggest that the 5-minute PVT may provide researchers with an alternative tool for investigating fatigue in the flying environment. thesis (PhD)--University of South Australia, 2004.

APA, Harvard, Vancouver, ISO, and other styles

31

Lin, Jen-Hon, and 林建宏. "Analyzing the Factors of Flight Fatigue of Helicopter Pilots-Using Army Aviation Pilots as an Example." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/16458127982080426341.

Full text

Abstract:

碩士 中華大學 科技管理學系(所) 95 Human factor is the key cause in affecting the flight safety, and then the flight fatigue stands a crucial part in the human factors. Tactical flight will facilitate the increase of fatigue due to the psychology pressure and physiological clock. The operation of weapon and reconnaissance systems、unaided NVG flight、the umpteen standard traffic pattern training, all of these will guide to the result of mental and physiological fatigue. According to the result of research that the NVG and gunnery trainings are the worst tasks that cause the flight fatigue. So, in order to conduct these two tasks that we have provide task training and safety education. Increase the aviation physiological and dark adaptation training to reduce the flight fatigue of NVG；Increase the fire pattern training and provide the enough resource to reduce the workload. Furthermore, the vibration of the rotary-wing aircraft is key cause of the pilot’s neck and low-back pain. We have to reduce the vibration of the helicopter by upgrade the engine and the rotary blade design, and redesign the more comfortable seat to solve the pilot’s problem. Also advice the army management unit to amend the relative rules and regulations, by thoroughly understands the flight fatigue, effectively uses the human resource to reduce the effect of fatigue to the flight safety.

APA, Harvard, Vancouver, ISO, and other styles

32

Rocha, João Artur de Freitas. "Pilots Performance and Flight Safety." Master's thesis, 2019. http://hdl.handle.net/10400.6/8869.

Full text

Abstract:

The purpose of this study is to understand the impact, evolution, and perception of cognitive fatigue as a contributory factor on the occurrence of incidents and accidents, on unpressurized aircraft. This study uses the science principles present in the ”Fatigue Management Guide for Airline Operators” (FMG) to evaluate data obtained by four methods of measuring cognitive fatigue. These consist of two objective measures, Psychomotor Vigilance Test (PVT) and an actiwatch (Readiband 5), and two subjective measures, Samn-Perelli 7-point fatigue Scale (SPS) and sleep diaries. It is also obtained results from a survey aimed to all national and international pilots and related to this theme. From this research are draw conclusions of the influence and evolution of cognitive fatigue on the operations of unpressurized aircrafts and it is understood the difference between perceived cognitive fatigue and the real cognitive fatigue accumulated by the pilot. Is also drawn findings from a launched survey related to this theme. In this case study the focus will fall upon general aviation where there are no ways to control and monitor the fatigue element, which is associated with the cause of most incidents and accidents that occur in Portugal as concluded by analyzing several GPIAAF (Gabinete de Prevenção e Investigação de Acidentes com Aeronaves e de Acidentes Ferroviários) final reports using HFACS (Human Factor Analysis and Classification System). Normally this type of research is conducted within airline operators, that are already a very restricted and controlled domain of civil aviation. O objetivo deste estudo é compreender o impacto, a evolução e a perceção da fadiga cognitiva como fator contribuinte na ocorrência de incidentes e acidentes em aeronaves não pressurizadas. Este estudo utiliza os princípios científicos apresentados no ”Fatigue Management Guide for Airline Operators” (FMG) para avaliar os dados obtidos por quatro métodos de medição da fadiga cognitiva. Estes consistem em duas medidas objetivas, Psychomotor Vigilance Test (PVT) e um dispositivo de rastreio (Readiband 5), e duas medidas subjetivas, Samn-Perelli Escala de Fadiga de 7 pontos (SPS) e diários de sono. Também são obtidos resultados de um inquérito dirigido a todos os pilotos nacionais e internacionais relacionado a este tópico. A partir desta pesquisa são tiradas conclusões da influência e evolução da fadiga cognitiva em operações de aeronaves não pressurizadas bem como a diferença entre a fadiga cognitiva percetível pelo piloto e a fadiga cognitiva real acumulada. Também são retiradas conclusões do inquérito lançado. Este caso de estudo recairá sobre a aviação geral, onde não há formas de controlar e monitorizar o elemento de fadiga, que é a causa da maioria dos incidentes e acidentes que ocorrem em Portugal, o que se conclui da análise de vários relatórios finais do GPIAAF (Gabinete de Prevenção e Investigação de Acidentes com Aeronaves e de Acidentes Ferroviários) usando o HFACS (Human Factor Analysis and Classification System). Normalmente este tipo de pesquisa é conduzida no seio de operadores aéreos, que já são um domínio muito restrito e controlado da aviação civil.

APA, Harvard, Vancouver, ISO, and other styles

33

Shiu, Chau Ming, and 許朝銘. "The Study of Fighter Pilots Working Fatigue and Willingness for Career Change in Relay to Role Pressure and Emotion in R.O.C. Air Force." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/20206427882573883141.

Full text

Abstract:

碩士 大葉大學 國際企業管理學系碩士在職專班 95 Air power stands for military capability of a country. Moreover, fighter pilots play a key role in air power. Following the new paradigm of society and the Armed Forces Refining Program, the Air Force is facing an extreme challenge, i.e., lots of pilots retired and most of the others are planning to retire and work for civil airline company. The Air Force is losing his pilots. The main objective of this study is to find out the pilots working fatigue and willingness for career change in relay to role pressure and emotion. According to 376 questionnaire surveys, emotional is related to pilots role pressure and job pressure. Working fatigue is related to role pressure and emotional. Once the pilot working fatigue, they will think of career change. The assumption and conclusion in this study show that the trend of retirement of second generation fighter pilots is still upwards. The Air Force should not only study and find out the reason why fighter pilots resign, but make policy to alleviate the present situation and to insure air power.

APA, Harvard, Vancouver, ISO, and other styles

Dissertations / Theses on the topic 'Pilot fatigue'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles