• 산업경영시스템학회지
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• 제39권1호
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• pp.31-36
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• 2016

Recently, Live-Virtual-Constructive (L-V-C) integrate training system has proposed as a solution for the problems such as limitation of training areas, increase of mission complexity, rise in oil prices. In order to integrate each training system into the one effectively, we should solve the issue about stress of pilots by the environmental differences between Live and Virtual simulation which could be occurred when each system is connected together. Although it was already examined in previous study that the psychological effects on pilots was occurred by the environmental differences between actual and simulated flights, the study did not include what the causal factors affecting psychological effects are. The aim of this study is to examine which environmental factors that cause pilots' psychological effects. This study analyzed the biochemical stress hormone, cortisol to measure the pilots' psychological effects and cortisol was measured using Enzyme-linked immunoassay (EIA). A total of 40 pilots participated in the experiment to compare the differences in pilots' cortisol response among live simulation, virtual simulation, and the virtual simulation applying three environmental factors (gravity force, noise, and equipment) respectively. As a result, there were significant differences in cortisol level when applied the gravity force and equipment factors to the virtual simulation, while there was no significant difference in the case of the noise factor. The results from this study can be used as a basis for the future research on how to make L-V system by providing minimum linkage errors and design the virtual simulator that can reduce the differences in the pilots' psychological effects.

• 소성∙가공
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• 제16권4호
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• pp.293-298
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• 2007

Recently, there is a need to produce a large forged part for the flight, shipping, some energies, and military industries, etc. Therefore, an open die forging technique of cast ingots is required to obtain higher quality of large size forged parts. Cogging process is one of the primary stages in many open die forging processes. In the cogging process prior to some open die forging processes, internal cavities have to be eliminated for defect-free. The present work is concerned with the elimination of the internal cavities in large ingots so as to obtain sound products. In this study, hot compression tests were carried out to obtain the flow stress of cast microstructure at different temperature and strain rates. The FEM analysis is performed to investigate the overlap defect of cast ingots during cogging stage. The measured flow stress data were used to simulate the cogging process of cast ingot using the practical material properties. Also the analysis of cavity closure is performed by using the $DEFORM^{TM}-3D$. The calculated results of cavity closure behavior are compared with the measured results before and after cogging, which are scanned by the X-ray scanner. From this result, the criteria for deformation amounts effect on the cavity closure can be investigated by the comparison between practical experiment and numerical analysis.

• 대한간호학회지
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• 제35권4호
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• pp.672-679
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• 2005

Introduction. Cardiovascular disease has the potential to lead to sudden in-flight incapacitation and permanent grounding. The aims of this study are to examine the relationships between lifestyle, job stress and blood lipid levels of male aircrew personnel of a Korean airline and to identify which factors influence their hyper-lipidemia. Methods. Two hundred sixteen male aircrew personnel completed a questionnaire by self-report and consented to participate in the study. The questionnaire collected data related to job stress, life style, serum cholesterol levels and general characteristics of the aircrew. The cholesterol levels of the subjects were collected from their most recent health check-up records. Subjects were divided into two groups (the desirable group and the risk group) based on their serum cholesterol level, 200 mg/dl. Results. Mean age and marital status were significantly different between the two groups. More subjects in the risk group had habits of eating high lipid foods, while more subjects in the desirable group exercised more frequently than the risk group. In logistic regression analysis, after controlling age and marital status, types of working situation (domestic duty or international duty, odds ratio=.390, p=.018), diet (odds ratio=.429, p=.037), and exercise (odds ratio=.320, p=.055) were influencing factors on aircrew's serum cholesterol lev-els. Conclusions. The cholesterol level of aircrew personnel is closely related to their lifestyle, such as lipid diet and exercise. The type of work situations, e.g. staying in an airplane for long periods of time or staying abroad, may influence these diet patterns and exercise habits.

• 한국항공우주학회지
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• 제49권8호
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• pp.617-626
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• 2021

비행체의 초음속 비행 중 고온 환경에서의 열 거동은 비행체의 열 구조 설계에 중요하다. 본 연구에서는 전역-국부 다중 디지털 이미지 상관기법을 사용하여 노치 구조물의 전 영역의 열변형 및 응력집중 현상에 대해 관찰/분석하였다. 다중 DIC 시스템은 2D DIC 시스템과 3D DIC 시스템으로 구성되었다. 가열 챔버를 이용하여 노치 시편을 가열하였으며 여러 온도에서 다중 DIC 시스템을 사용하여 구조물의 변형 이미지를 촬영하고 분석하였다. 다중 DIC 기법을 사용하여 노치 시편의 전 영역 변형률과 노치 부위의 응력집중 현상을 계측/분석하였으며 ABAQUS^TM 프로그램을 이용하여 노치 시편에 대해 유한요소해석을 진행하고 실험결과와 비교 분석하였다. 본 연구를 통해 다중 DIC 시스템의 열변형 계측과 응력 집중 현상의 연구 분석에서의 활용 가능성을 보여주었다.

• 항공우주의학회지
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• 제31권3호
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• pp.64-67
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• 2021

When the COVID-19 crisis hit air transport, the whole aviation industry was affected. The change in the behavior of passengers following the COVID-19 crisis, travel restrictions and the ensuing economic crisis have resulted in a dramatic drop in demand for airline services. The COVID-19 pandemic, with all its associated consequences, has had a significant impact on the mental health and well-being of pilots, which could impact operational safety. As the number of international flights has decreased, pilots are exposed to high levels of psychological stress such as job instability, reduced income and increased risk of infection during flight work. Psychological stress lowers work performance and threatens aviation safety. The pilot needs mental health management during the COVID-19 pandemic, but psychological support is weak. For pilot mental health management, it is important to raise awareness about mental health and to continuously respond. To this end, it is necessary to foster a safe and trustworthy culture in which mental health issues are discussed freely and solved together without hiding them. They should also support the establishment of a peer support program that is easily accessible and that allows pilots to discuss their issues with confidence.

• 인지과학
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• 제33권3호
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• pp.135-154
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• 2022

본 연구는 코로나-19로 인한 스트레스를 높게 지각할 때, 스트레스를 낮게 지각할 때에 비하여 응집성이 낮은 사회적 범주에 대한 속성 일반화가 강해진다는 것을 확인하기 위해 이루어졌다. 이를 위해 본 연구는 응집성이 높은 범주(수녀, 군인, 비행기승무원)와 낮은 범주(웨딩플래너, 통역사, 플로리스트)를 선정하였고, 336명의 참가자를 모집하여 범주기반 속성 일반화 과제(범주 구성원 몇몇에게 반복 관찰되는 속성이 범주 구성원 전체에서 얼마나 나타날지 추론)를 수행하게 하였으며, 이들이 지각한 코로나-19 스트레스 정도를 측정하였다. 결과적으로, 사회적 범주의 응집성이 높을 때, 낮을 때에 비하여 속성 일반화가 강해지는 효과와 코로나-19로 인한 스트레스를 높게 지각하는 사람들에게서 낮게 지각하는 사람들보다 속성 일반화가 강해지는 효과를 관찰하였다. 더하여 본 연구는 코로나-19 스트레스를 높게 지각하는 사람들은 스트레스를 낮게 지각하는 사람들에 비해, 응집성이 낮은 범주에서도 반복 관찰되는 속성을 강하게 일반화하는 경향이 있음을 확인하였다. 본 연구는 코로나-19 발생 이후 고정관념과 편견이 심화되고, 차별적 행동이 증가하는 현상의 근본에 코로나-19 스트레스와 이로 인한 속성 일반화 경향 증가라는 인지적 기제가 존재함을 보여 준다는 측면에서 중요하다.

• 한국항공운항학회:학술대회논문집
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• 한국항공운항학회 2016년도 춘계학술대회
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• pp.48-49
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• 2016

최근 사회 전반에서 직업인식에 대한 고정관념이 점점 얕아지고 성별이나 사회적 통념과는 상관없이 자신의 적성에 맞는 직업을 택하는 사회적 변화가 일어나고 있다. 특히 최근 항공업계에서는 대표적인 여성 직업 중 하나로 인식되던 항공사 객실승무원이 되기를 희망하는 남성들이 많아지고 있고, 남성 객실승무원의 채용규모 역시 폭발적으로 증가하고 있는 추세이다. 그러나 기존 연구들을 살펴보면 객실승무원이 겪는 일반적인 스트레스요인들과 직무만족, 조직몰입과의 관계를 연구한 논의는 꾸준히 있어왔지만, 그러한 스트레스들이 남승무원/여승무원이라는 성별 차이에 따른 비교연구는 전무했다. 이에 본 연구는 역할스트레스를 구성하고 있는 요인들이 남승무원/여승무원이라는 조절변수에 따라 직무만족과 조직몰입에 미치는 연구모형을 구성하고 실증연구를 시행한다.

• 한국항공운항학회:학술대회논문집
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• 한국항공운항학회 2016년도 춘계학술대회
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• pp.55-63
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• 2016

항공사 종사원의 직무스트레스에 관한 연구는 대부분 항공사 운항승무원을 제외한 객실승무원이나 기타 항공사 종사자의 직무스트레스에 관한 연구가 대부분이어서 본 연구는 항공기의 운항에 있어서 최종 의사결정자라고 할 수 있는 조종사의 직무스트레스를 연구함에 의미가 있을 것으로 사료된다. 최근 운항승무원의 이직증가에 따른 문제를 인식하여 운항승무원이 조직에서 느끼는 직무스트레스 요인과 조직몰입, 직무만족간의 상관관계를 분석함으로써 보다 효율적인 조직 관리 방안의 필요성에 대해 연구하고자 한다. 이를 통해 조종사의 이직의도를 예방하고 관리하여 업무효율을 높이고 나아가 개인의 건강한 삶에 도움이 되는 기초 자료를 마련하고자 한다.

• 통합자연과학논문집
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• 제8권3호
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• pp.176-183
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• 2015

Corticotropin-releasing actor receptors (CRFRs) activates the hypothalamic pituitary adrenal axis, one of the 2 parts of the fight or flight response to stress. Increased CRH production has is associated with Alzheimer's disease and major depression and hypoglycemia. In this study, we report the important structural and chemical parameters for CRFR inhibitors using the derivatives of 8-substituted-2-aryl-5-alkylaminoquinolines. A 3D QSAR study, Comparative molecular field analysis (CoMFA) was performed. The best predictions were obtained for the best CoMFA model with a $q^2$ of 0.607 with 6 components and $r^2$ of 0.991. The statistical parameters from the generated CoMFA models indicated that the data are well fitted and have high predictive ability. The contour map resulted from the CoMFA models might be helpful in the future designing of novel and more potent CRFR derivatives.

• 통합자연과학논문집
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• 제9권4호
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• pp.241-248
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• 2016

Corticotropin-releasing factor receptors (CRFRs) activate the hypothalamic-pituitary-adrenal axis, which is an integral part of the fight or flight response to stress. Increase in CRH level is observed in Alzheimer's disease and major depression and hypoglycemia. Here, we report on the relevant physicochemical parameters required for the CRFR inhibitors. Comparative molecular similarity indices analysis (CoMSIA) was performed with the derivatives of 8-substituted-2-aryl-5-alkylaminoquinolinesas CRFR inhibitors. The best predictions were obtained for the best CoMSIA model with a $q^2$ of 0.576 with 6 components and $r^2$ of 0.977. The statistical parameters from the generated CoMSIA models indicated that the data are well fitted and have high predictive ability. CoMSIA contour maps could be useful in the designing of more potent and novel CRFR derivatives.