• 보건의료산업학회지
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• 제10권2호
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• pp.205-216
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• 2016

Objectives : The purpose of this study was to determine the association between musculoskeletal workload and job stress in early childcare teachers. Methods : This study was based on The Korean Working Condition Survey conducted on wage workers. The total number of individuals included in the analysis was 395 (286 childcare teachers and 109 kindergarten teachers) early childcare teachers in 2011. The collected data were analyzed by frequency statistic, cross-tabulation analysis and logistic regression. Results : The adjusted odds ratio showed a statistically effective association for job stress exposure. The results were as follows: education level, service environment, emotional labor, fatigue or posture led to pain for a high level of job stress. Additionally, for childcare teachers, the results showed that fatigue or posture led to pain when moving a heavy object frequently. Conclusions : When childcare teachers are assigned a task to lift heavy or awkward or objects, care should be taken on who is assigned the task, and it should be done safely. An intervention program should be developed to train childcare teachers to safely and efficiency do heavy labor in early childcare education classes.

• 한국감성과학회:학술대회논문집
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• 한국감성과학회 1999년도 춘계학술발표논문집 논문집
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• pp.139-145
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• 1999

In current study on 8 college students there was examined modulation of eyeblink (as measured by integrated EMG of m.orbicularis oculi) and skin conductance response (SCR) to an acoustic startle probe (85 dB[A] white noise) by attending to task presented in auditory modality (to memorize words for further recognition) and entire performance of the word recognition test. Both eyeblink magnitude and SCR amplitude and rise time to startle probes were modified (larger magnitude of EMG peak, lower amplitude and shorter rise time of SCR) during attending to task as compared to performance on test. Results are interpreted n terms of modification of electrodermal and eyeblink components of startle and orienting reflexes by task characteristics (passive versus active efforts), attentional demands and aversiveness of experimental situation. However, eyeblink startle response manifested potentiation during attending to task, while SCR demonstrated attenuation. There are discussed implications of startle modulatioas a potentially sensitive probe of situational demands in stress research and also are considered prospects for further studies.

• 한국산학기술학회논문지
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• 제21권11호
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• pp.715-727
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• 2020

본 연구의 목적은 캐빈승무원이 지각한 조직문화 유형, 임파워먼트와 직무스트레스에 대하여 실증적으로 분석하여, 항공사 산업의 인적관리를 위한 서비스 매뉴얼을 제작하고 관리하는 실무자들에게 적절한 규정을 설계하기 위한 기초자료를 제공하고자 한다. 본 연구의 실증분석을 위해 대형항공사 및 저가항공사에 근무 중인 캐빈승무원 335명을 대상으로 자기보고식 설문조사를 실시하였고, 자료 분석은 SPSS 23.0과 AMOS 23.0을 사용하였다. 첫째, 조직문화 유형 중 관계지향문화, 위계지향문화, 과업지향문화 유형이 직무스트레스에 부-)적인 영향을 미치는 것으로 나타났다. 둘째, 혁신지향문화, 관계지향문화, 위계지향문화, 과업지향문화 유형 모두 임파워먼트에 정(+)적인 영향을 미치는 것으로 나타났다. 셋째, 임파워먼트는 직무스트레스에 부(-)적인 영향을 미치는 것으로 나타났다. 넷째, 임파워먼트의 매개효과를 살펴보면, 혁신지향문화, 관계지향문화, 위계지향문화, 과업지향문화 유형과 직무스트레스의 관계에서 임파워먼트는 모두 유의한 매개효과가 있음을 검증하였다. 결과적으로 항공사 캐빈승무원은 항공사 캐빈승무원들은 통제나 질서를 강조하는 위계적인 조직문화, 업무지향적 조직문화보다는 융통성이나 유연성을 지향하는 조직구조에서 더욱 일이 즐겁고 재미있으며 가치 있게 인식하고 있다는 것을 알 수 있었으며, 조직문화와 직무스트레스의 관계에서 임파워먼트는 매개적 변수인 것을 확인하였다. 이러한 임파워먼트를 높이기 위한 방안과 지속적인 관리와 지원에 따른 시사점을 논의하였다.

• Journal of Ginseng Research
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• 제43권4호
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• pp.499-507
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• 2019

Background: Ginsenoside Rb1 (Rb1), a dominant component from the extract of Panax ginseng root, exhibits neuroprotective functions in many neurological diseases. This study was intended to investigate whether Rb1 can attenuate cisplatin-induced memory impairments and explore the potential mechanisms. Methods: Cisplatin was injected intraperitoneally with a dose of 5 mg/kg/wk, and Rb1 was administered in drinking water at the dose of 2 mg/kg/d to rats for 5 consecutive wk. The novel objects recognition task and Morris water maze were used to detect the memory of rats. Nissl staining was used to examine the neuron numbers in the hippocampus. The activities of superoxide dismutase, glutathione peroxidase, cholineacetyltransferase, acetylcholinesterase, and the levels of malondialdehyde, reactive oxygen species, acetylcholine, tumor necrosis factor-${\alpha}$, interleukin-$1{\beta}$, and interleukin-10 were measured by ELISA to assay the oxidative stress, cholinergic function, and neuroinflammation in the hippocampus. Results: Rb1 administration effectively ameliorates the memory impairments caused by cisplatin in both novel objects recognition task and Morris water maze task. Rb1 also attenuates the neuronal loss induced by cisplatin in the different regions (CA1, CA3, and dentate gyrus) of the hippocampus. Meanwhile, Rb1 is able to rescue the cholinergic neuron function, inhibit the oxidative stress and neuroinflammation in cisplatin-induced rat brain. Conclusion: Rb1 rescues the cisplatin-induced memory impairment via restoring the neuronal loss by reducing oxidative stress and neuroinflammation and recovering the cholinergic neuron functions.

• 터널과지하공간
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• 제30권6호
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• pp.573-590
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• 2020

본 논문에서는 국제공동연구인 DECOVALEX-2023 프로젝트 Task G의 연구 현황과 현재까지 수행된 benchmark 해석 결과를 소개하였다. Task G의 명칭은 'Safety ImplicAtions of Fluid Flow, Shear, Thermal and Reaction Processes within Crystalline Rock Fracture NETworks(SAFENET)'로, 결정질 암반 내 균열의 생성과 성장 메커니즘 및 균열에서 발생하는 열-수리-역학적 복합거동을 해석하기 위한 수치해석기법을 개발하는 데에 목표가 있다. Task G의 첫 번째 연구 테마는 결정질 암석 내 단일 균열의 역학적 거동에 대한 해석해(analytical solution)를 바탕으로 각 연구팀의 수치모델링기법을 개발 및 검증하는 Benchmark 해석이다. 본 연구에서는 3차원 입자기반 개별요소모델을 이용하여 단일 균열을 포함한 암석의 역학적 거동 특성을 모델링하고자 하였다. 이 모델에서는 상호독립적으로 거동하는 개별입자의 집합체를 통해 암석의 구조적 특징을 모사하고, 입자와 입자간 접촉에서 발생하는 역학적 거동을 개별요소해석모델인 3DEC을 통해 계산하게 된다. 해석 결과, 도메인의 경계응력으로 인해 균열에 유도되는 수직응력과 전단응력 수준은 변위 구속과 응력 재배치로 인해 이론적인 수치보다 낮게 나타났다. 그러나 수치모델에서 계산된 수직변위와 전단변위는 실제 균열의 유도 응력을 통해 추정된 해석해와 비교할 때 상당히 유사한 결과를 보였으며 균열의 응력-변위 관계를 합리적으로 재현할 수 있음을 확인하였다. 본 연구의 해석모델은 Task G에 참여하는 국외 연구팀들과의 의견 교류와 워크숍을 통해 지속적으로 개선하는 한편, 향후 다양한 조건의 실내시험에 적용하여 타당성을 검증할 예정이다.

• 한국의류학회지
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• 제42권5호
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• pp.884-896
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• 2018

This study investigates coping strategies of overweight or underweight males in Korea. For this purpose, the authors identify types of stress related to weight management. A qualitative method was utilized to collect the data related to successful weight management experiences of males aged 20-37 years. Data were analyzed based on a motivation theory of coping, which suggests coping strategy elements. The results of this study identified the stress related to weight: dissatisfaction with appearance, others' disapproval of appearance, health problems, weaker athletic ability, negative self-perception, passiveness about appearance, lower romantic attractiveness, others' disapproval of lower romantic attractiveness, weakened task execution capability, and negative stereo-types about task execution capability. In addition, six coping strategies were suggested: improved appearance, improved physical function, improved positive self-perception, more choices to improve appearance, enhanced romantic relationship, and enhanced job performance. This study shows that weight problems in modern society are diverse and complex. Therefore a man who has abnormal weight needs to clarify his stress first and then proposes strategies that are appropriate for each type of stress.

• 대한가정학회지
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• 제41권6호
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• pp.167-183
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• 2003

This study reviewed the literature pertaining to the cause and effects of job stress. Many definitions of stress have been offered and the diversity of these definitions has been generated by medical scientists, psychologists, and behavioral scientists. Most approaches dealing with job stress have involved listing of various sources of job stress, moderators, and outcomes. This study is concerned with the selection of variables, the relationships between job stressors and outcomes, and the effects of moderators on these relationships investigated in job stress research. A review of job stress literature presents that various job stressors (e. g., task characteristics, role characteristics, organizational characteristics, career development, and relationships), moderators (e. g., locus of control, type A and B personality, social support, and demographics), and outcomes (e. g., perceived stress, job satisfaction, job commitment, organizational commitment, performance, turnover, and physiological symptoms) were used for a greater understanding of job stress.

• 한국산업정보학회논문지
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• 제26권6호
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• pp.17-34
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• 2021

지식관리가 조직 성과에 중요한 조건으로 인식되면서, 조직들은 지식관리 정책 및 기술에 대한 투자를 증가시키고 있다. 지식관리가 성과를 도출하기 위해서는 개인이 보유하고 있는 좋은 지식을 지속해서 공유하는 것이 필요하다. 본 연구는 개인의 지식관리시스템을 통한 지식공유 의도에 미치는 긍정적, 부정적 원인을 제시하고, 조직 공유 분위기가 미치는 영향을 제시하는 것을 목적으로 한다. 연구는 선행연구를 통하여 연구 모델 및 가설을 제시하였으며, 지식관리시스템을 도입한 조직에 근무하는 조직원을 대상으로 설문지 기법을 통해 417개의 표본을 확보하였다. 그리고 구조방정식모델링을 실시하여 가설 검증을 하였다. 분석 결과, 지식관리시스템에 대한 유용성과 이용 용이성이 지식공유 의도에 긍정적 영향을 주었으며, 업무 갈등과 모호성이 부정적 영향을 주었다. 지식공유 분위기는 기술수용모델과 업무 스트레스에 각각 선행 요인으로서 영향을 주었다. 또한, 업무 스트레스는 유용성과 이용 용이성의 지식공유 의도에 미치는 영향을 조절하였다. 결과는 지식관리시스템 도입 시 고려해야 할 개인의 긍정적, 부정적 동기를 제시하였으며, 조직 차원에서 추진해야 할 방향성을 제시한 것에서 시사점을 가진다.

• 터널과지하공간
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• 제33권3호
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• pp.189-207
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• 2023

In the present study, the thermoshearing experiment on a rough rock fracture were modeled using a three-dimensional grain-based distinct element model (GBDEM). The experiment was conducted by the Korea Institute of Construction Technology to investigate the progressive shear failure of fracture under the influence of thermal stress in a critical stress state. The numerical model employs an assembly of multiple polyhedral grains and their interfaces to represent the rock sample, and calculates the coupled thermo-mechanical behavior of the grains (blocks) and the interfaces (contacts) using 3DEC, a DEM code. The primary focus was on simulating the temperature evolution, generation of thermal stress, and shear and normal displacements of the fracture. Two fracture models, namely the mated fracture model and the unmated fracture model, were constructed based on the degree of surface matedness, and their respective behaviors were compared and analyzed. By leveraging the advantage of the DEM, the contact area between the fracture surfaces was continuously monitored during the simulation, enabling an examination of its influence on shear behavior. The numerical results demonstrated distinct differences depending on the degree of the surface matedness at the initial stage. In the mated fracture model, where the surfaces were in almost full contact, the characteristic stages of peak stress and residual stress commonly observed in shear behavior of natural rock joints were reasonably replicated, despite exhibiting discrepancies with the experimental results. The analysis of contact area variation over time confirmed that our numerical model effectively simulated the abrupt normal dilation and shear slip, stress softening phenomenon, and transition to the residual state that occur during the peak stress stage. The unmated fracture model, which closely resembled the experimental specimen, showed qualitative agreement with the experimental observations, including heat transfer characteristics, the progressive shear failure process induced by heating, and the increase in thermal stress. However, there were some mismatches between the numerical and experimental results regarding the onset of fracture slip and the magnitudes of fracture stress and displacement. This research was conducted as part of DECOVALEX-2023 Task G, and we expect the numerical model to be enhanced through continued collaboration with other research teams and validated in further studies.

• 한국압력기기공학회 논문집
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• 제15권1호
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• pp.28-32
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• 2019

In nuclear power plant operation and spent fuel canisters, it is necessary to provide a sound technical basis for the safety and security of long-term operation and storage respectively. Recently, the peening technology is being discussed and the technology will be adopted to ASME Section III, Division 1, Subsection NX (2019 Edition). The peening is prohibited in current edition, but it will be approved in 2019 Edition and adopted. However, Surface stress improvement techniques such as the peening is used to mitigate SCC susceptible in operating nuclear plants. Although the peening will be approved to ASME CODE, there are no performance criteria listed in the 2019 edition. The Korean International Working Group (KIWG) formed a new Task Group named "Advanced Surface Stress Improved Technology". The task group will develop a CODE CASE to address PWSCC(Primary Water Stress Corrosion Cracking) and CISCC(Chloride Induced Stress Corrosion Cracking) for new ASME Section III components. TG-ASSIT was started to make peening performance criteria for ASME Section III (new fabrication) applications. The objective of TG-ASSIT is to gain consensus among the relevant Code groups that requirements/mitigation have been met.