• Science of Emotion and Sensibility
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• v.26 no.2
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• pp.129-140
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• 2023

Following ISO 20471, in this study, first, two sets of safety clothes and safety vests were made by designing and attaching animal and bird patterns preferred by children to retroreflective films and black fabrics on those fluorescent fabrics and retroreflective materials prescribed by international standards. Second, by mounting a smart photonic device on the safety clothing so that the body can be recognized from a distance even without an ambient light source at night, children can emit three types of light depending on the situation with just one-touch of the button. From a result of comparison with visibility a day and night by dressing a mannequin in the made smart safety clothing, the difference in visibility was evident at night, it was confirmed that we can see the figure of a person even at a distance of approximately 70 m. Therefore, it is expected to contribute to the prevention of traffic and other accidents on the road, as the drivers driving at night or in bad weather can recognize a person from a distance. Third, in case of the energy is exhausted and cannot maintain the stability of the light-emitting function of the optical faber, we can use energy harvesting device, and the light-emitting time will be extended. As a result it comes up to emit light stably for a long time. And this prove that smart photonic safety clothing can also be used for night workers. Therefore, optical fiber safety clothing is expected to be highly wearable not only in real life but also in dark industrial sites due to stable charging by applying the energy harvesting provided by solar cells.

• Journal of the Korean Geotechnical Society
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• v.32 no.6
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• pp.27-40
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• 2016

Conventional warning criteria for landslides due to rainfall in broad regions have limitations, because they did not have proper reflection of topography, forest physiognomy, and unsaturated soil properties, et al. This study suggested a new stability model for unsaturated slope analyses during rainfall, considering rainfall pattern, geomorphological characteristics (slope angle, soil depth), engineering properties of unsaturated soils, and tree surcharge and root reinforcement. Stability analysis not considering root reinforcement and tree surcharge tends to over-predict a factor of safety in unsaturated slopes. Developed slope stability model was used to build database on the factor of safety in unsaturated slopes during rainfall, and it was integrated with GIS to do quantitative risk analysis in landslide risk areas specified in Ulju. Landslide risk areas were located at downstream of the point with sudden drop in safety factor, as well as at regions with low safety factor during rainfall.

• Journal of the Society of Disaster Information
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• v.18 no.4
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• pp.746-753
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• 2022

Purpose: The purpose of this study is to review the safety of small tunnels for food storage excavation in the 1960s~1970s and to improve the stability of small tunnels. Method: A visual inspection and a hammer test were used to conduct safety tests, and the visual inspection is one of the tests conducted for non-destructive testing, and the hammer test is one of the types of hitting methods of rebound hardness. Result: According to the integrated analysis of the survey area data, there are generally good appearance, but there are many small cracks and complex geological conditions, requiring continuous observation and attention. Seven of the 23 tunnels require safety diagnosis, one collapse, one safe, and 14 require continuous observation and attention. Conclusion: All parts of small tunnels should be checked and recorded from time to time, and stability is expected to be improved when reinforcing small tunnels proposed in this study.

• Proceedings of the KIPE Conference
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• 2018.11a
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• pp.119-120
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• 2018

국내 원자력 발전소의 비상전원공급을 위하여 대체교류디젤 발전기와 납축전지를 사용하고 있다. 납축전지는 온도, 방전 전류, 수명 및 안정성 등에서 리튬계열전지와 비교되고 있으며, 전기적 특성이 우수하고 안정성이 높은 리튬계열전지의 사용이 고려되고 있다. 본 논문은 원전의 비상전원 설계를 위하여 납축전지와 리튬계열전지의 전기적 특성을 비교 분석하였다.

• The Journal of the Convergence on Culture Technology
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• v.5 no.2
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• pp.355-360
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• 2019

In this study, the structural stability of the railway level crossing system using rubber panel for high speed lines was investigated by applying the specification for wind load conditions (Train gust) of high speed train (300km/h and 360km/h). A finite element analysis using three-dimensional modeling was carried out by applying the field conditions that was installed with the complicated configuration of the rubber plate panel system. As a result of this study, the structural stability of the rubber plate panel system for high speed train gust was analytically verified.

• Journal of the Korean Society of Marine Environment & Safety
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• v.24 no.5
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• pp.537-544
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• 2018

In this study, a simple, efficient, user-based program called SCAR was developed for evaluating the sliding and collapse of artificial reefs due to hydrodynamic forces in ocean environments. SCAR was developed by applying Delphi code and a Graphical User Interface (GUI) based on the Morison formula for evaluating and analyzing the stability of artificial reefs. SCAR can be applied widely for design and stability evaluation of fishery structures (such as artificial reefs or other underwater structures) in undergraduate and graduate courses and by experts in the field.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.10 no.8
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• pp.1435-1442
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• 2006

The ideal method of safety evaluation is to verify results of execution against all possible operations within operating system, but it is impossible. However, the formal method can theoretically prove the safety on actual logic of operating system. Therefore we explain the contents of the art of the safety verification of security kernel, and make a comparative study of various standardized formal verification tools. And then we assigned PVS(Prototype Verification system) of SRI(Stanford Research Institute) to verify the safety of a modified BLP(Bell & LaPadula) model, the core access control model of multi-lavel based security kernel. Finally, we describe formal specification of the revised BLP model using the PVS, and evaluate the safety of the model by inspecting the specification of the PVS.

• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.650-654
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• 2008

친환경 공법의 수리적인 안전성 검토는 식생 및 자연재료의 물리적 특성, 하천의 수리 수문학적 특성, 유사특성과 이들의 상호관계 등에 대한 분석이 요구되며, 이에 선행하여 분석에 이용되는 장기간의 충분한 자료가 구축되어 있어야 한다. 그러나 우리나라의 경우 이러한 자료는 부족한 실정이며, 주로 시범구간을 통한 제한된 자료만이 이용되고 있을 뿐이므로 수리학적 치수방재적 측면에서 친환경 공법의 안전성 평가에 있어 많은 어려움을 겪고 있다. 본 연구에서 수질정화체의 배치 변화를 통한 수치해석 통하여 수심 및 유속분포를 비교 분석하여 수로의 3차원적 흐름특성을 파악하고, 실제 대상수로에 수질정화체를 설치하여 수로의 수리적 안정성을 연구하였다. FLOW-3D와 수리모형시험 그리고 대상수로 모니터링을 각 경우에 따라 유속, 수위를 측정하여 다양한 조건에 대한 흐름 특성을 연구하였다.

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2004.10a
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• pp.374-378
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• 2004

• Agrochemical news magazine
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• v.22 no.1 s.164
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• pp.8-11
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• 2001