• 한국산업보건학회지
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• 제32권4호
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• pp.456-464
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• 2022

Objectives: The Purpose of this study is to improve work environment measurement in construction industry by survey. Especially, this study focused on the defferences between construction staffs(safety manger, health manager) and work environment measurement institution workers. Methods: Survey targets are construction staffs(safety manger, health manager) and work environment measurement institution workers. Respondent was selected by respective councils and conferences. A questionnaire consisting of items on general characteristics and the improvement of work environment measurement in construction industry. Results: Total of 134 people(39 safety managers, 27 health managers, 68 work environment measurement institution workers) responded to survey. Overall, current work environment measurement was deemed unsuitable for construction industry. There was a significant difference between construction staff and work environment institution workers in some question. On the other hand, there was no noticeable significant difference in general characteristics. Conclusions: As a result of survey, current work environment measurement was deemed unsuitable for construction industry in terms of measurement method, measurement timing, and actual site improvement. In addition, there is a statistically significant differences in response between construction staff and work environment measurement institution workers, so it is necessary to reflect both opinions in order to improve work environment measurement in construction industry.

• 한국산학기술학회논문지
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• 제15권1호
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• pp.8-13
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• 2014

상용 트럭에서 탑재하고 있는 공압을 이용하는 브레이크 시스템에서 제동시간을 최소화 하기 위해 다양한 인자들에 대한 연구를 진행하였다. 실험 결과와 1차원 유체유동 네트워크 해석코드(FLOWMASTER) 결과와 비교하기 위하여 실험 지그를 제작하였다. 밸브 포트, 파이프 길이, 주변의 열적 환경에 대한 영향에 대해 제동 응답 시간과 압력 감소를 고찰하였다. 또한 탱크 압력에 대한 압력 감소에 대해 상관관계식을 도출하였다.

• Environmental Analysis Health and Toxicology
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• 제29권
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• pp.19.1-19.10
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• 2014

Objectives Lysosome is the cell-organelle which is commonly used as biomonitoring tool in environmental pollution. In this study, the lysosomal proteomic of the yeast Saccharomyces cerevisiae was analyzed for utilization in the detection of toxic substances in mine water samples. Methods This work informs the expression of lysosomal proteomic in yeast in response with toxic chemicals, such as sodium meta-arsenite and tetracycline, for screening specific biomarkers. After that, a recombinant yeast contained this biomarker were constructed for toxic detection in pure toxic chemicals and mine water samples. Results Each chemical had an optimal dose at which the fluorescent protein intensity reached the peak. In the case of water samples, the yeast showed the response with sample 1, 3, 4, and 5; whereas there is no response with sample 2, 6, and 7. Conclusions The recombinant yeast showed a high ability of toxic detection in response with several chemicals such as heavy metals and pharmaceuticals. In the case of mine water samples, the response varied depending on the sample content.

• 기본간호학회지
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• 제16권1호
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• pp.103-111
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• 2009

Purpose: The purpose of this study was to identify relationships between violence response, coping, and burnout among emergency department nurses. Method: This descriptive study using self report questionnaires was conducted from October 1 to October 20, 2008. Participants were 147 general nurses working in emergency departments in hospitals having over 500 beds and located in Busan. ANOVA and Pearson's correlation coefficients with SPSS PC+ WIN 14.0. were used to analyze the data. Results: Scores for violence response, coping, and burnout were 3.08 (1-5 scale), 2.57 (1-4 scale), and 3.22 (1-5 scale) respectively. There were significant differences in violence response and burnout by education, clinical careers, clinical careers in ED, and plans to work in the future, and no significant differences in coping by general characteristics. There was a significant and highly positive relationship between violence response and burnout. Conclusion: The degree of violence response and burnout was comparatively high, while that of coping was average. Therefore, it is necessary to develop effective programs related to prevention and coping with violence for nurses in emergency departments. Institutional measures by hospital authorities are also needed to improve the nursing quality by providing a safe workplace.

• Steel and Composite Structures
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• 제5권5호
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• pp.359-374
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• 2005

This paper presents the experimental and theoretical results of the viscoplastic response and collapse of 316L stainless steel tubes subjected to cyclic bending. The tube bending machine and curvature-ovalization measurement apparatus, which was designed by Pan et al. (1998), were used for conducting the cyclic curvature-controlled experiment. Three different curvature-rates were controlled to highlight the characteristic of viscoplastic response and collapse. Next, the endochronic theory and the principle of virtual work were used to simulate the viscoplastic response of 316L stainless steel tubes under cyclic bending. In addition, a proposed theoretical formulation (Lee and Pan 2001) was used to simulate the relationship between the controlled cyclic curvature and the number of cycles to produce buckling under cyclic bending at different curvature-rates (viscoplastic collapse). It has been shown that the theoretical simulations of the response and collapse correlate well with the experimental data.

• KIEAE Journal
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• 제9권1호
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• pp.99-106
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• 2009

This study aims to survey the acoustical environment in the region around airport where there are various transportation noises such as aircraft noise, railway noise and traffic noise, and to analyze the subjective response on the noise to the people who live in house or work in office nearby airport. Measurement and subjective response evaluation were carried out at the same time and outdoor noise level was measured all day long to calculate one day results such as average Leq or one day WECPNL etc. The results showed that the military aircraft produces very high level comparing with commercial aircraft, for instance the sound level of commercial outdoor was lower than that of military aircraft indoor. Double and triple window were more effective for controlling the noise than single window, which showed the possibility of sound insulation treatment by installing windows having higher sound insulation performance. Finally the subjective response was resulted that the most annoying noise is from aircraft and counterplan they hope is 'airport moving out'. Leq 65 dB(A), the criteria value of sound insulation treatment, was corresponding to the subjective response of median annoyance '4' out of 7th scale.

• Nuclear Engineering and Technology
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• 제51권2호
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• pp.600-606
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• 2019

Studies on the application of the lead rubber bearing (LRB) isolation system to nuclear power plants are being carried out as one of the measures to improve seismic performance. Nuclear power plants with isolation systems require seismic probabilistic safety assessments, for which the seismic fragility of the structures, systems, and components needs be calculated, including for beyond design basis earthquakes. To this end, seismic response analyses are required, where it can be seen that the behaviors of the isolation system components govern the overall seismic response of an isolated plant. The numerical model of the LRB used in these seismic response analyses plays an important role, but in most cases, the extreme performance of the LRB has not been well studied. The current work therefore develops an extreme nonlinear numerical model that can express the seismic response of the LRB for beyond design basis earthquakes. A full-scale LRB was fabricated and dynamically tested with various input conditions, and test results confirmed that the developed numerical model better represents the behavior of the LRB over previous models. Subsequent seismic response analyses of isolated nuclear power plants using the model developed here are expected to provide more accurate results for seismic probabilistic safety assessments.

• Nuclear Engineering and Technology
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• 제53권8호
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• pp.2728-2745
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• 2021

The purpose of this study is to reduce seismic responses of an actual nuclear piping system using a tuned mass damper (TMD) device. A numerical piping model was developed and validated based on shaking table test results with actual nuclear piping. A TMD for nuclear piping was newly devised in this work. A TMD shape design suitable for nuclear piping systems was conducted, and its operating performance was verified after manufacturing. The response reduction performance of the developed TMD under earthquake loading on actual piping was investigated. Results confirmed that, on average, seismic response reduction rates of 34% in the maximum acceleration response, 41% in the root mean square acceleration response, and 57% in the spectral acceleration response were shown through the TMD application. This developed TMD operated successfully within the seismic response reduction rate of existing TMD optimum design values. Therefore, the developed TMD and dynamic interpretation help improve the nuclear piping's seismic performance.

• Advances in Computational Design
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• 제8권2호
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• pp.97-112
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• 2023

The Finite Element (FE) modeling of Reinforced Concrete (RC) under seismic loading has a sensitive impact in terms of getting good contribution compared to experimental results. Several idealized model types for simulating the nonlinear response have been developed based on the plasticity distribution alone the model. The Continuum Models are the most used category of modeling, to understand the seismic behavior of structural elements in terms of their components, cracking patterns, hysteretic response, and failure mechanisms. However, the material modeling, contact and nonlinear analysis strategy are highly complex due to the joint operation of concrete and steel. This paper presents a numerical simulation of a chosen RC column under monotonic and cyclic loading using the FE Abaqus, to assessthe hysteretic response and failure mechanisms in the RC columns, where the perfect bonding option is used for the contact between concrete and steel. While results of the numerical study under cyclic loading compared to experimental tests might be unsuccessful due to the lack of bond-slip modeling. The monotonic loading shows a good estimation of the envelope response and deformation components. In addition, this work further demonstrates the advantage and efficiency of the damage distributions since the obtained damage distributions fit the expected results.

• 한국재난정보학회 논문집
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• 제19권3호
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• pp.597-607
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• 2023

연구목적:고용노동부는 근로자의 산업재해 및 건강장해 예방을 위한 업무를 수행하는 주무부처로서 그간 자연재난 중 폭우로 인한 근로자의 안전을 위해 노력을 해 왔으나, 폭우로 인한 사업장 재난을 막기에는 역부족이였다. 이에 따라, 고용노동부에서 폭우재난을 대응했던 실제 사례를 분석하고 대응체계 개선을 위한 방안을 제시하고자 한다. 연구방법: 본부·지방관서·한국산업안전보건공단에서 재난업무를 수행하는 담당자로 구성된 내부 전문가집단과 교수, 컨설팅 대표, 타부처 재난담당자로 구성된 외부 전문가집단과 함께 폭우재난을 대응하기 위해 실시한 비상대응체계, 업종별 자율점검, 사업장 점검, 중대사이렌 활용, 안전관리 및 복구작업 지도 등에 관한 내용을 검토하였다. 연구결과:우선, 상시 연락체계는 수시로 점검이 필요하며, 세부적인 업종별 자율점검표 마련·배포도 필요하다. 또한, 사업장 점검 시 자율점검 이행여부 확인을 해야 하며, 중대재해 사이렌으로 통해 알리는 정보의 가독성을 높일 방안도 필요 해 보인다. 아울러, 안전작업은 도급형태로 이뤄지기 때문에 구체적인 안전지침 마련도 필요해 보인다. 결론:계절적 유해·위험요인으로 인한 근로자의 생명을 보호하기 위해서는 과거처럼 수동적인 대처방법과 달리 이상기후는 돌발상황으로 여겨서는 안되고, 관행적인 틀에서 벗어나 적극적이고 선제적으로 대응해야 할 것이다.