• Nuclear Engineering and Technology
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• v.50 no.7
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• pp.1088-1098
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• 2018

Kori unit #1, which is the first commercial nuclear power plant in Korea, was permanently shutdown in June 2017, and it is about to be decommissioned. Currently in Korea, researches on the decommissioning technology are actively conducted, but there are few researches on workers internal exposure to radioactive aerosol that is generated in the process of decommissioning nuclear power plants. As a result, the over-exposure of decommissioning workers is feared, and the optimal working time needs to be revised in consideration of radioactive aerosol. This study investigated the annual exposure limits of various countries, which can be used as an indicator in evaluating workers' internal exposure to radioactive aerosol during pipe cutting in the process of decommissioning nuclear power plants, and the growth and dynamics of aerosol. Also, to evaluate it, the authors compared/analyzed the cases of aerosol generated when activated pipes are cut in the process of nuclear power plants and the codes for evaluating internal exposure. The evaluation codes and analyzed data conform to ALARA, and they are believed to be used as an important indicator in deriving an optimal working time that does not excess the annual exposure limit.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2015.11a
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• pp.147-148
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• 2015

Exposed type waterproofing PVC sheets installed on structure rooftops are subject to changes in physical properties after longterm exposure to sunlight. Particularly when consideration the rotational movement of sunlight over the day through the course of the sun rising from the east and setting in the west, in the case of flat roofs the amount of UV ray the the surface of the PVC waterproofing sheet receives may be even throughout, but in cases of slanted rooftops the sunlight exposure may be uneven across the surface. In this regard, this study examines the effect uneven sunlight exposure on the exposed type waterproofing PVC sheets installed on slanted rooftops.

• Proceedings of the Korean Vacuum Society Conference
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• 2015.08a
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• pp.238.2-238.2
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• 2015

Surface modification of vertically-aligned carbon nanotube (VACNT) is essential in order to meet specific demands for particular applications such as field emission displays, heat dissipation device and potential sun energy conversion due to their superior electrical and thermal conductivity and strong light absorption. In this study, we observe the effect of exposure to water vapor on a different lengths of the surfaces of VACNT. The study was conducted on three different lengths of the VACNT: short length around $200{\mu}m$, medium-length around $500{\mu}m$, and high length around 1 mm. Water exposure time ranges between 2-10 min and temperature of the water ranges from 60 to 120 oC. The result of water vapor exposure mainly show that increasing the exposure time and water temperature give rise to increase of the speed of change on the surface of the VACNT. Especially, the shorter VACNT change their surface morphology most rapidly.

• Journal of the Korean Society of Fashion and Beauty
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• v.5 no.1 s.12
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• pp.8-13
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• 2007

The purpose of the study was to analyze how to express the eroticism on the female's contemporary sportswear. Six hundred fifty few pictures in the fashion magazines such as Vogue, and Elle etc., and at the collections through the internet from 2000 to 2005, were used for the analysis. Other related books and articles were also used for the study. The eroticism on the female's contemporary sportswear was mainly expressed through two ways such as direct exposure and indirect exposure. The details of the eroticism expressed through these two ways were as follows; 1. The extent of direct exposure in bust area and leg were excessive compared to other body area specially in tennis wear, swimsuit, boxing wear and dance wear etc. 2. See-through and close adhesion were used in order to express eroticism indirectly.

• Proceedings of the Korea Concrete Institute Conference
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• 2005.05b
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• pp.197-200
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• 2005

In this study, for the establishment of the performance evaluation methods and the quality control standards of durability recovery method, the quantitative exposure data by long term exposure test under the coast is accumulated and analyzed Investigating and evaluating the result of exposure test at 30 month of exposure age under the coastal environment, carbonation and salt damage are not happened at all but the difference in electric potential are found. Therefore, it is considered that the reinforcement corrosion at replacement with repair material are caused by active-passive corrosion macrocells.

• Proceedings of the PSK Conference
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• 2003.04a
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• pp.167.1-167.1
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• 2003

The human exposure level of cadmium can be varied by environmental level of cadmium and individual life style. This study was conducted to estimate current exposure of cadmium using up-to date in Korea. The exposure estimates were intended to representative of the general adult group with 60kg. This study quantified human exposure level of cadmium through food, air and soil except water because domestic all data was not detected. (omitted)

• Journal of the Semiconductor & Display Technology
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• v.10 no.4
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• pp.15-20
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• 2011

The lithography system installed inside precision industry's (e.g. TFT-LCD) production factories are increasing in size, thereby increasing its dynamic load along with it. Such condition causes vibration within the area where the system is installed, which then negatively affects the production line to produce defective products. To prevent this type of situation, the facilities should adopt dynamic design that considers the lithography system's dynamic load. This study predicts the maximum value allowed for dynamic stiffness (which is a ratio of vibration response against a single unit of the dynamic load) of the lithography system and explains the result of its application on actual structures inside the facilities.

• Safety and Health at Work
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• v.14 no.1
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• pp.43-49
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• 2023

Background: Messaging surrounding skin cancer prevention has previously focused on the general public and emphasized how or when activities should be undertaken to reduce solar ultraviolet radiation (UVR) exposure. Generic messages may not be applicable to all settings, and should be tailored to protect unique and/or highly susceptible subpopulations, such as outdoor workers. The primary objective of this study was to develop a set of tailored, practical, harm-reducing sun safety messages that will better support outdoor workers and their employers in reducing the risk of solar UVR exposure and UVR-related occupational illnesses. Methods: We adapted a core set of sun safety messages previously developed for the general population to be more applicable and actionable by outdoor workers and their employers. This study used an integrated knowledge translation approach and a modified Delphi method (which uses a survey-based consensus process) to tailor the established set of sun safety messages for use for outdoor worker populations. Results: The tailored messages were created with a consideration for what is feasible for outdoor workers, and provide users with key facts, recommendations, and tips related to preventing skin cancer, eye damage, and heat stress, specifically when working outdoors. Conclusion: The resulting tailored messages are a set of evidence-based, expert- approved, and stakeholder-workshopped messages that can be used in a variety of work settings as part of an exposure control plan for employers with outdoor workers.

• Journal of Marine Life Science
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• v.7 no.2
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• pp.102-112
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• 2022

Crucian carp, Carassius carassius (Weight 39.7±3.1 g, Length 14.8±0.5 cm) were exposed to waterborne nickel at 0, 10, 20, 40, 80 and 160 mg Ni²⁺/l. The lethal concentration 50 (LC₅₀) of C. carassius exposed to waterborne nickel was 117.69 mg Ni²⁺/l. In hematological parameters, RBC counts was significantly increased at 48 hours, whereas a significant decrease was observed at 96 hours. The MCV and MCH were significantly increased in the concentration of 80 mg Ni²⁺/l at 96 hours. The plasma components such as calcium, magnesium, glucose, cholesterol, total protein, AST, ALT and ALP were significantly changed by waterbonre nickel exposure. The results of this study suggest that the nickel exposure to C. carassius affects the survival rates, hematological parameters and plasma components as toxicity

• Journal of Marine Life Science
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• v.7 no.2
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• pp.129-138
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• 2022

Crucian carp, Carassius carassius (Weight 42.4 ± 9.0 g, Length 15.0 ± 1.0 cm) were exposed to waterborne zinc at 0, 5, 10, 20, 40 and 80 mg Zn²⁺/l for 96 hours. The lethal concentration 50 (LC₅₀) at 96 hours of crucian carp, C. carassius exposed to waterborne zinc was 51.58 mg Zn²⁺/l. In hematological parameters, the RBC count was significantly decreased in the concentration of 40 mg Zn²⁺/l at 48 hours, whereas the hematocrit was significantly increased by zinc exposure. The MCV (mean corpuscular volume) (µl) and MCH (mean corpuscular hemoglobin) (pg) were significantly increased in the concentration of 40 mg Zn²⁺/l at 48 hours. The plasma components such as calcium, magnesium, glucose, cholesterol, total protein and ALT (Alanine aminotransminase) were significantly changed by zinc exposure. The results of this study suggest that the zinc exposure to C. carassius induced the significant physiological changes in the hematological parameters and plasma components as toxicity.