• Journal of the Korean Society of Industry Convergence
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• v.26 no.5
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• pp.757-763
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• 2023

Major industrial accidents in which workers die due to fires or explosions while working at chemical substance handling workplaces continue to occur. Among the major industrial accidents that occurred between 2005 and 2021, the accident status by work situation and equipment was analyzed. Through analysis, it was confirmed that storage, reaction, and piping facilities were the main causes of the accident, and a self-checklist for each facility was developed. Verification was conducted through the supply and use groups to evaluate the suitability of the use, duties, and items of the self-checklist. The user group showed higher satisfaction than the supplier group for all three suitability of use, job, and item. In particular, since the inspection items of the self-checklist were organized around the cause of the accident derived through the analysis of actual accident cases, the satisfaction level was high in all groups. It is expected that the self-checklist developed through this study will be useful not only for large companies but also for small and medium-sized chemical industries that lack professional manpower.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2019.11a
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• pp.87-88
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• 2019

Research has been conducted in many fields for the zero energy of domestic buildings. Among them, the development of insulation has become an essential element. Accordingly, researches are being made to improve the performance of organic insulating materials, and PF boards having the lowest thermal conductivity among organic insulating materials have been in the spotlight. However, problems have arisen due to the problems of durability of insulation materials such as PF boards and past acidification, and the durability of insulation materials is deteriorated when moisture or water enters due to crack gaps during the insulation of the basement layer or the external insulation method. In regard to the durability of the insulation, when the organic insulators of different kinds were placed in water, the pH was weakly basic in all organic insulation materials except PF, and the PF was about 4 pH. As a result, the PF should be continuously reviewed, and further analysis should be carried out to determine what causes acidification.

• Journal of the Korean Society of Safety
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• v.30 no.3
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• pp.7-12
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• 2015

CFRP composites are used as primary structural members in various industrial fields because their specific strength and specific stiffness are excellent in comparison to conventional metals. Their usage is expanding to high added-value industrial fields because they are more than 50% lighter than metals, and have excellent heat resistance and wear resistance. However, when CFRP composites suffer impact damage, destruction of fiber and interface delamination occur. This causes an unexpected deterioration of strength, and for this reason it is very difficult to ensure the reliability of the excellent mechanical properties. Therefore, for the destruction mechanism in bending with impact damage, this study investigated the reinforcement data regarding various external loads by identifying the consequential strength deterioration. Specimens were damaged by impact with a steel ball propelled by air pressure. Decrease in bending strength caused by the tension and compression of the impact side, and depending on the lamination direction of fiber and interface inside the specimen. From the bending test it was found that the bending strength reduced when the impact energy increased. Especially in the case of compression on the impact side, as tensile stress occurred at the damage starting point, causing rapid failure and a substantially reduced failure strength.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.23 no.5
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• pp.58-65
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• 2009

A forest fire in the area of power line installations may be caused by flashover disturbances in power systems. In this study, experiments were conducted so as to investigate the reduction in dielectric strength caused by combustion flame, and flashover characteristics in the simulated condition of vertical-type model power lines were examined by making shorter and longer the horizontal distance(s) between combustion flame and high-voltage conductors under the application of 60[Hz] a.c. and d.c. high-voltages. As the results of the experimental investigation it is demonstrated that flame can reduce flashover voltages of the model air-gap in shorter range of the horizontal distance(s). Relative air density is considered in order to analyze the reduction causes of the flashover voltages, and it can be seen that the relative air density has a great influence on the flashover characteristics under the presence of combustion flame.

• Journal of Oriental Neuropsychiatry
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• v.20 no.2
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• pp.217-227
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• 2009

Objectives : Multiple sclerosis (MS) is a demyelination disease of central nervous system, presenting a various neurological disorders depending on the lesion. In the view of oriental medicine, MS is similar to Flaccidity-syndrome(痿證). Also, since MS is a chronic disease which repeats the recurrences with periods of remission of the symptoms in between, it may usually be accompanied by depression. However, the etiology, treatment, and cause of recurrence of MS remain unknown, and also, as the recurrences of MS have been repeated, disease burden has been accumulated, which aggravates disorder. This case of MS experienced depression after the patient had been diagnosed as bad consequence based on the past 5 times recurrences of multiple sclerosis. Methods : We saw the causes as vicera and bowels functional disorder which might have come from a poor diet. Thus, we diagnosed this case as dual deficiency of spleen and kidney(脾腎兩虛), stagnant qi transforming into fire(氣鬱化火) and liver-kidney deficiency(肝腎不足) and treated it with Herb medication, acupuncture therapy, and supportive therapy, making the patient better. Results : We have improved the patient's condition to the time before 5th recurrence. Conclusions : This result suggests that our oriental medical treatments was effective on multiple sclerosis with depression.

• Proceedings of the KSRS Conference
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• 2005.10a
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• pp.7-10
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• 2005

Plant water deficiency during drought season causes physiological stress and can be a critical indicator of forest fire vulnerability. In this study, we attempt to analyze the spectral characteristics of water stressed vegetation by using the laboratory measurement on leaf samples and the canopy reflectance spectra extracted from satellite hyperspectral image data. Leaf-level reflectance spectra were measured by varying moisture content using a portable spectro-radiometer. Canopy reflectance spectra of sample forest stands of two primary species (pine and oak) located in central part of the Korean peninsula were extracted from EO-l Hyperion imaging spectrometer data obtained during the drought season in 2001 and the normal precipitation year in 2002. The preliminary analysis on the reflectance spectra shows that the spectral characteristics of leaf samples are not compatible with the ones obtained from canopy level. Although moisture content of vegetation can be influential to the radiant flux reflected from leaf-level, it may not be very straightforward to obtain the spectral characteristics that are directly related to the level of canopy moisture content. Canopy spectra form forest stands can be varied by structural variables (such as LAt, percent coverage, and biomass) other than canopy moisture content.

• Journal of Korean Philosophical Society
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• no.122
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• pp.1-23
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• 2018

In the final argument for the immortality of the soul in the Phaedo, Socrates establishes a new type of cause which he describes as 'more sophisticated' and on the basis of it attempts to show that the soul is immortal. In the process, he introduces three examples for the cause, i.e. three, fire, and snow. But there has been considerable controversy over the ontological status of the three and the soul. Some scholars think that they are all forms; others believe that neither of them is. In this paper I argue that in fact one of them is a form, while the others are not. I also argue that the fact that they do not have the same ontological status and the uncertainty in the nature of the soul itself weaken the cogency of the final argument as a whole.

• Journal of Microbiology and Biotechnology
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• v.33 no.9
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• pp.1141-1148
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• 2023

Herein, we explored the potential of the apple's core microbiota for biological control of Erwinia amylovora, which causes fire blight disease, and analyzed the structure of the apple's bacterial community across different tissues and seasons. Network analysis results showed distinct differences in bacterial community composition between the endosphere and rhizosphere of healthy apples, and eight taxa were identified as negatively correlated with E. amylovora, indicating their potential key role in a new control strategy against the pathogen. This study highlights the critical role of the apple's bacterial community in disease control and provides a new direction for future research in apple production. In addition, the findings suggest that using the composition of the apple's core taxa as a biological control strategy could be an effective alternative to traditional chemical control methods, which have been proven futile and environmentally harmful.

• Journal of Korean Medical classics
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• v.35 no.1
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• pp.81-92
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• 2022

Objectives : This paper aims to analyze the origins of the pathogenic qi[邪氣] concept through analysis of related character shapes and examples within the Mawangdui Yishu, where we can grasp the state of medicine pre-Huangdineijing. Methods : Etymology was determined through ancient character analysis, while examples of its usage and original texts were compared to extract their implications. For usage analysis, medical texts of later periods that contained similar verses or contents with the Mawangdui text were compared, through which similarities and changes in meaning of the word or verse were examined. Conclusions : While the term 'xieqi(邪氣, pathogenic qi)' had not yet been mentioned in the Mawangdui text, 'eqi(惡氣)' was used similarly. Wind[風], cold[寒], dampness[濕] were not only understood as terms referring to weather or climate but possible causes for disease. Meanwhile, there was lingering belief from the Shang(商) period that saw disease as God's punishment, which could be seen as transition phenomenon from superstition to rational thought. Through diseases 'wind disease[風病]' and 'bi(痹)', we could determine that medicine at the time was limited to the Yin-yang theory, having not yet integrated the Five phases perspective. Moreover, the possibility of other pathogenic qi elements, 'heat[暑]', 'dryness[燥]', and 'fire[火]' could be assumed to have been embedded in 'wenbing(溫病)'.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.25 no.1
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• pp.85-92
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• 2011

The role of RCDs(Residual Current Protective Device) that are installed before the load is very important for preventing electric shock and electrical fire. However, although fault rate of RCD is increasing due to deterioration and long period usage, the RCD is permanently used without a checking of performance evaluation and it causes the electrical accident. In this paper, the amount of airborne chloride is researched in domestic costal area and the accelerated life test is conducted using a salt water spray tester in order to decide the life time of RCD. Aa a result of an accelerated life test, the MTTF(Mean Time To Failure) of RCD is 110.81 hours and B10 life time of RCD is 45.81 hours for the all samples. when an accelerated life test result is applied to within 2 km costal area, the life time of RCD is predicted about 5 years.