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Browsing by Subject "Helicopters"

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    Aviation risk perception: a comparison between experts and novices
    (Wiley-Blackwell Publishing, 2004) Thomson, M. E.; Önkal D.; Avcioǧlu, A.; Goodwin, P.
    This article describes an exploratory investigation of the risk perceptions of experts and novices in relation to helicopter operations, under conditions where the participants are matched on various characteristics previously found to affect perceptions, such as demographic, gender, and background factors. The study reports considerable evidence of perceptual differences between the two participant groups (i.e., expert pilots and candidate pilots). We find that the experts' perceptions of relative risks are more veridical, in terms of their higher correlation with the true relative frequencies. A significant positive correlation between the flight hours and the contextual risk-taking tendency is also shown, leading the experienced pilots' choices toward risky alternatives in scenarios - a potential result of their overconfidence based on superior task performance. Possible explanations are offered for the findings and potential avenues for future research are identified.
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    Preconditioning large integral-equation problems involving complex targets
    (IEEE, 2008-07) Malas, Tahir; Gürel, Levent
    When the target problem is small in terms of the wavelength, simple preconditioners, such as BDP, may sufficiently accelerate the convergence. On the other hand, for large-scale problems, the matrix equations become much more difficult to solve, and therefore, the importance of preconditioning become more evident for both formulations. In this paper, we demonstrate the use of novel, strong, and efficient preconditioners for the solutions of large EFIE and CFIE problems.
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    Yangın söndürme helikopter pilotu, emekli subay: Ali Akgün'ün hayatı ve mesleğinin detayları
    (Bilkent University, 2020) Candemir, Mine; Kındıra, Doğa; Güney, Batuhan; Taştekin, Fahrettin; Aksümer, Salih
    Bu araştırmada yangın söndürme helikopter pilotu Ali Akgün'ün çocukluğu, eğitim hayatı, pilotluk eğitmenliği, mesleği ve mesleğinin uygulanma biçimi, çalıştığı kurumun teknolojik gelişmelerle birlikte helikopterle yangın söndürme konusundaki günümüzdeki ve geçmişteki yeri incelenecektir. Ormanların geniş yüzölçümü kapladığı Türkiye'de orman yangınları doğal yaşamı tehdit eden bir sorundur, bu sorunla mücadelede kullanılan yöntemleri, sürecin işleyişini, tarihsel gelişimini canlı bir tanıktan öğrenmek bu konudaki bilinci arttırmak için önemli bir adımdır. Akgün, 1988 yılında kurulan Orman Genel Müdürlüğü Havacılık Şube Müdürlüğünde 2010 yılına kadar orman yangınlarıyla mücadele amaçlı kullanılan helikopterlerde kaptan pilot olarak görev yapmıştır. Mesleğini uzun yıllar sürdüren emekli subay, Türkiye'nin kanayan yaralarından biri olan orman yangınlarıyla mücadele etmiştir.

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