• 정신신체의학
• /
• 제25권2호
• /
• pp.111-119
• /
• 2017

연구목적 본 연구는 메르스(Middle East Respiratory Syndrome, MERS(Middle East Respiratory Syndrome, 이하 MERS) 사태 발생 당시에 받은 스트레스가 사회심리적 건강에 미치는 영향을 알아보고, 회복탄력성이 매개효과로서 사회심리적 건강에 영향을 주는지를 알아보고자 하였다. 방 법 MERS가 발생한 병원의 병원종사자 156명과 일반인 127명을 대상으로 스트레스 자각척도, 사회심리적 건강측정 도구, 코너-데이비슨 리질리언스 척도를 시행하였다. 스트레스가 사회심리적 건강에 미치는 영향 및 회복탄력성의 매개효과를 확인하기 위해 피어슨 상관관계분석과 위계적 다중회귀분석을 실시하였다. 결 과 병원종사자와 일반인 모두에서 지각된 스트레스가 높을수록 사회 심리적 건강이 좋지 않음을 보였고, 지각된 스트레스가 높을수록 낮은 회복탄력성을 나타냈으며, 스트레스와 사회심리적 건강 사이의 관계에서 회복탄력성이 부분 매개를 하는 것으로 나타났다. 결 론 본 연구는 MERS 사태로 인해 받은 스트레스가 사회심리적 건강에 영향을 미침에 있어서 개인의 회복탄력성의 정도가 간접적으로 사회심리적 건강에 긍정적 효과를 끼칠 수 있고, 회복탄력성 강화를 목표로 한 임상적 개입 및 사회심리적 접근방법이 위기 발생시 정신건강을 유지하는데 중요함을 시사한다.

• Geomechanics and Engineering
• /
• 제18권4호
• /
• pp.449-457
• /
• 2019

Physical model tests were first performed to investigate the failure pattern of multiple pillar-roof support system. It was observed in the physical model tests, pillars were design with the same mechanical parameters in model #1, cracking occurred simultaneously in panel pillars and the roof above barrier pillars. When pillars 2 to 5 lost bearing capacity, collapse of the roof supported by those pillars occurred. Physical model #2 was design with a relatively weaker pillar (pillar 3) among six pillars. It was found that the whole pillar-roof system was divided into two independent systems by a roof crack, and two pillars collapse and roof subsidence events occurred during the loading process, the first failure event was induced by the pillars failure, and the second was caused by the roof crack. Then, for a multiple pillar-roof support system, three types of failure patterns were analysed based on the condition of pillar and roof. It can be concluded that any failure of a bearing component would cause a subsidence event. However, the barrier pillar could bear the transferred load during the stress redistribution process, mitigating the propagation of collapse or cutting the roof to insulate the collapse area. Importantly, some effective methods were suggested to decrease the risk of catastrophic collapse, and the deep-hole-blasting was employed to improve the stability of the pillar and roof support system in a room and pillar mine.

• 정신신체의학
• /
• 제24권1호
• /
• pp.109-116
• /
• 2016

연구목적 본 연구는 소방공무원에서 탄력성이 외상후스트레스 증상 및 해리에 미치는 영향과 함께, 탄력성과 각 외상후스트레스 증상 및 해리의 관계에서 우울의 매개효과에 대해서 알아보고자 하였다. 방 법 총 115명의 소방공무원을 대상으로, 생활사건 체크리스트, 사건충격척도-개정판, 해리경험척도, 벡 우울척도, 코너-데이비슨 탄력성 척도를 시행하였다. 탄력성이 외상후스트레스 증상과 해리에 미치는 영향 및 우울의 매개효과를 확인하기 위해 구조방정식모형(Structural equation modeling)과 경로분석(path analysis)을 실시하였다. 결 과 탄력성이 높을수록 낮은 외상후스트레스 증상과 낮은 해리를 보였으며, 각 탄력성과 외상후스트레스 증상 및 해리의 관계는 우울이 완전 매개를 하는 것으로 나타났다. 즉, 탄력성이 외상후스트레스 증상 및 해리에 대해 직접적인 영향이 아닌 우울을 통해 간접적으로 각 증상을 감소시킴을 보여주었다. 결 론 본 연구는 소방공무원에서 외상후스트레스 증상 및 해리의 예방과 치료에 있어 탄력성 강화와 우울 증상 감소를 목표로 한 임상적 개입이 중요함을 시사한다.

• 대한불안의학회지
• /
• 제6권1호
• /
• pp.65-70
• /
• 2010

Objectives : Indirect contact with trauma may occur when a person empathically listens to detailed descriptions, exposing the person to intense emotional pain from trauma victims. Although less severe than direct trauma, indirectly traumatized persons may experience the same fear, rage, and despair as direct trauma victims. This phenomenon has been variously termed vicarious trauma, traumatic countertransference, burnout, compassion fatigue, and secondary traumatic stress. Using a psychiatric symptoms questionnaires, this study investigated the effects of indirect exposure to co-worker's trauma on the mental health of firefighters who had not directly experienced traumatic events in the previous year. Methods : We administered self-report questionnaires, such as the Impact of Event Scale-Revised (IESR) and Alcohol Use Disorder Identification Test (AUDIT), to firefighters working at two fire stations in a metropolitan city. We analyzed 188 of 232 collected surveys, after excluding falsely entered data (28 cases) and questionnaires by directly-traumatized victims (16 cases). Results : Alcohol consumption and posttraumatic stress disorder (PTSD) symptoms, as determined by the AUDIT and IES-R, were significantly higher in the indirectly-traumatized group. The ratio of high-risk members scoring higher than 23 in IES-R was larger in the indirectly traumatized group, although this was not statistically significant. Conclusion : Alcohol consumption was significantly higher in the indirectly traumatized group. This group also included more members at high risk for PTSD. Further research, with a larger group of indirectly traumatized firefighters and ongoing investigation of PTSD development and other psychiatric symptoms, is needed.

• Smart Structures and Systems
• /
• 제32권3호
• /
• pp.153-166
• /
• 2023

Health monitoring of civil infrastructures, in particular, old bridges that are still in service, has become more than necessary, given the risk that a possible degradation or failure of these infrastructures can induce on the safety of users in addition to the resulting commercial and economic impact. Bridge integrity assessment has attracted significant research efforts over the past forty years with the aim of developing new damage identification methods applicable to real structures. The bridge of Ouled Mimoun (Tlemcen, Algeria) is one of the oldest railway structure in the country. It was built in 1889. This bridge, which is too low with respect to the level of the road, has suffered multiple shocks from various machines that caused considerable damage to its central part. The present work aims to analyze the stability of this bridge by identifying damages and evaluating the damage rate in different parts of the structure on the basis of a finite element model. The applied method is based on an inverse analysis of the normal stress responses that were calculated from the corresponding recorded strains, during the passage of a real train, by means of a set of strain gauges placed on certain elements of the bridge. The results obtained from the inverse analysis made it possible to successfully locate areas that were really damaged and to estimate the damage rate. These results were also used to detect an excessive rigidity in certain elements due to the presence of plates, which were neglected in the numerical reference model. In the case of the continuous bridge monitoring, this developed method will be a very powerful tool as a smart health monitoring system, allowing engineers to take in time decisions in the event of bridge damage.

• 동력기계공학회지
• /
• 제19권5호
• /
• pp.60-66
• /
• 2015

Embrittlement of material by hydrogen charging should be cleared for safety of storage vessel of hydrogen and components deal with hydrogen. A stainless steel is generally used as materials for hydrogen transportation and storage, and it has a big advantage of corrosion resistance due to nickel component in material. In this study, microscopic damage behavior of stainless steel according to the hydrogen charging time using nondestructive evaluation was studied. The surface of stainless steel became more brittle as the hydrogen charging time increased. The parameters of nondestructive evaluation were also changed with the embrittlement of stainless steel surface by hydrogen charging. Ultrasonic test, which is the most generalized nondestructive technique, was applied to evaluate the relationship between the ultrasonic wave and mechanical properties of stainless steel by hydrogen charging. The attenuation coefficient of ultrasonic wave was increased with hydrogen charging time because of surface embrittlement of stainless steel. In addition, acoustic emission test was also used to study the dynamic behavior of stainless steel experienced hydrogen charging. AE event at the hydrogen charged specimen was obviously decreased at the plastic zone of stress-strain curves, while the number of event for the specimen of hydrogen free was dramatically generated when compared with the specimens underwent hydrogen charging.

• Archives of Pharmacal Research
• /
• 제27권7호
• /
• pp.757-762
• /
• 2004

The protective adaptive response to electrophiles and reactive oxygen species is mediated by the induction of phase II detoxifying genes including glutathione S-transferases (GSTs). NF-E2-related factor-2 (Nrf2) phosphorylation by protein kinase C (PKC) is a critical event for its nuclear translocation in response to oxidative stress. Previously, we have shown that peroxynitrite plays a role in activation of Nrf2 and Nrf2 binding to the antioxidant response element (ARE) via the pathway of phosphatidylinositol 3-kinase (PI3-kinase) and that nitric oxide synthase in hepatocytes is required for GSTA2 induction. In view of the importance of PKC and Pl3-kinase in Nrf2-mediated GST induction, we investigated the role of these kinases in peroxynitrite formation for GSTA2 induction by oxidative stress and determined the relationship between PKC and PI3-kinase. Although PKC activation by phorbol 12-myristate-13-acetate (PMA) did not increase the extents of constitutive and inducible GSTA2 expression, either PKC depletion by PMA or PKC inhibition by staurosporine significantly inhibited GSTA2 induction by tert-butylhydroquinone (t-SHa) a prooxidant chemical. Therefore, the basal PKC activity is req- uisite for GSTA2 induction. 3-Morpholinosydnonimine (SIN-1), which decomposes and yields peroxynitrite, induced GSTA2, which was not inhibited by PKC depletion, but slightly enhanced by PKC activation, suggesting that PKC promotes peroxynitrite formation for Nrf2-mediated GSTA2 induction. Treatment of cells with S-nitroso-N-acetyl-penicillamine (SNAP), an exogenous NO donor, in combination with t-BHQ may produce peroxynitrite. GSTA2 induction by SNAP ＋ t-BHQ was not decreased by PKC depletion, but rather enhanced by PKC activation, showing that the activity of PKC might be required for peroxynitrite formation. LY294002 a P13-kinase inhibitor blocked GSTA2 induction by t-BHQ, which was reversed by PMA-induced PKC activation. These results provide evidence that PKC may playa role in formation of peroxynitrite that activates Nrf2 for GSTA2 induction and that PKC may serve an activator for GSTA2 induction downstream of PI3-kinase.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2007년도 춘계학술대회A
• /
• pp.666-671
• /
• 2007

To acquire the safety along with durability of mechanical machinery products, we should consider the structural mechanics such as stress, deformation and dynamic vibration characteristics and identify those important aspects in the stage of preliminary design engineering. This cryogenic ball valve is used to transfer the liquified natural gas which temperature is $-196^{\circ}C$, supplied pressure is $168kg/cm^2$. For the cryogenic ball valve, the assurance of structural integrity and operability are essential to meet not only normal, abnormal loading conditions but also functionality during a seismic event. In this thesis, analytical approach and results using finite element analysis and computational method are herein presented to evaluate the aspects of structural integrity along with operability of cryogenic ball valve. In this study, we designed the high pressure cryogenic ball valve that accomplishes zero leakage by elastic seal at normal temperature and metal seal at high temperature.

• Advances in Computational Design
• /
• 제1권2호
• /
• pp.195-206
• /
• 2016

Dams play a vital role in the development and sustainment in a country. Failure of dams leads to the catastrophic event with sudden release of water and is of great concern. Hence earthquake-resistant design of dams is of prime importance. The present study involves static, modal and transient analyses of dam-reservoir-foundation system using finite element software ANSYS 15. The dam and the foundation are modeled with 2D plane strain element "PLANE 42" and the reservoir by fluid acoustic element "FLUID 29" with proper consideration of fluid-structure interaction. An expression for the fundamental period of concrete dams is developed based on modal analysis. Seismic response of gravity dams subjected to earthquake acceleration is evaluated in terms of peak displacement and stress.

• 한국조경학회지
• /
• 제45권2호
• /
• pp.1-10
• /
• 2017

본 연구는 여행참여와 외상적 사건이 주관적 웰빙에 미치는 영향을 검증하였다. 이를 위하여, 긍정적 감정, 부정적 감정 그리고 삶의 만족도를 종속변수로, 여행참여 여부와 외상적 사건의 회상정도를 독립변수로 하여 유사실험을 설계하였다. 2~3주 간격으로 4번 수집한 종단자료를 반복측정 분산분석으로 분석한 결과, 여행참여는 긍정적 감정과 삶의 만족도를 향상시켰으며, 그 효과는 4주 이상 지속되어 여행은 사람들의 주관적 웰빙을 향상시키는 수단이라는 것을 밝혔다. 외상적 사건을 많이 회상한 집단은 부정적 감정이 사고 직후부터 높아졌으며, 그 영향은 7주 이상 지속되었다. 부정적 사건은 긍정적 사건보다 주관적 웰빙에 미치는 영향력이 강하며, 오래 가는 경향이 있기 때문이었다. 여행과 마찬가지로 도시공원 방문도는 즐거운 여가경험이기 때문에 본 연구의 결과를 적용해 도시공원이 중장기적으로 도시민의 주관적 웰빙을 증가 또는 유지시키며, 스트레스를 완화시킬 수 있는 수단이라는 점을 고찰하였다.