• 한국인터넷방송통신학회논문지
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• 제15권6호
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• pp.209-215
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• 2015

반도체 관련 산업의 발전에 따라 반도체 제조공정에서 염산, 황산, 과산화수소, 불산, 피라니아 등과 같은 다양한 형태의 유독 가스와 화합물들이 사용되고 있고 누출 사고 역시 빈번하게 발생되고 있는 것이 사실이다. 유독 가스 누출사고 발생시 대량의 인명 피해가 발생되고 있는 것 역시 사실이다. 본 연구에서는 구미 불산 누출 사고와 같은 화학물질 누출 사고의 위험으로부터 인명을 보호하고 피해를 최소화 하기 위한 기본 해결책으로 대학에서의 MSDS 교육의 필요성에 대해 고찰하였다. 또한 GHS와 REACH 제도와 MSDS 이용의 적정성의 이해를 통해 유해 화학 물질의 노출로부터 안전을 지키는 문제에 대해 고찰하였다.

• Nuclear Engineering and Technology
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• 제48권1호
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• pp.1-15
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• 2016

For a long time, a top priority in the nuclear industry was the safe, reliable, and economic operation of light water reactors. However, the development of accident-tolerant fuel (ATF) became a hot topic in the nuclear research field after the March 2011 events at Fukushima, Japan. In Korea, innovative concepts of ATF have been developing to increase fuel safety and reliability during normal operations, operational transients, and also accident events. The microcell $UO_2$ and high-density composite pellet concepts are being developed as ATF pellets. A microcell $UO_2$ pellet is envisaged to have the enhanced retention capabilities of highly radioactive and corrosive fission products. High-density pellets are expected to be used in combination with the particular ATF cladding concepts. Two concepts-surface-modified Zr-based alloy and SiC composite material-are being developed as ATF cladding, as these innovative concepts can effectively suppress hydrogen explosions and the release of radionuclides into the environment.

• 반도체디스플레이기술학회지
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• 제18권2호
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• pp.98-102
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• 2019

Direct plasma-enhanced atomic layer deposition (PEALD) are widely used for $SiO_2$ and SiON thin film process in current semiconductor industry. However, this exhibits poor step coverage for three-dimensional device structure due directionality of plasma species as well as plasma damage on the substrate. In this study, to overcome this issue, low temperature (< $300^{\circ}C$) $SiO_2$ and SiON thin film processes were studied using inductively coupled plasma (ICP) type remote PEALD with various reactant gases such as $O_2$, $H_2O$, $N_2$ and $NH_3$. It was confirmed that the interfacial properties such as fixed charge density and charge trapping behavior of thin films were considerably improved by hydrogen species in $H_2O$ and $NH_3$ plasma compared to the films grown with $O_2$ and $N_2$ plasma. Furthermore, the leakage current density of the thin films was suppressed for same reason.

• 식품과학과 산업
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• 제51권2호
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• pp.127-135
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• 2018

지방산화는 기본적으로 불포화지방과 산소의 결합이나 이 현상을 제대로 알고 실제 식품에 적용하기 위해서는 지방산화에 미치는 모든 인자들의 화학적 관점(one-electron reduction potential, bond dissociation enthalpy) 뿐만 아니라 물리적 현상(interface, antioxidant polar paradox)을 포괄적으로 이해해야 한다. Invitro실험법에 의해 도출된 산화방지제는 가능성을 보여주는 것이나 실제 식품과 bulk oil, 유화형태, 오르가노젤과 같은고체 상태의 다양한 매트릭스에서는 다른 활성을 나타낸다. 또한 산화방지제의 농도와 다른 물질의 존재에 따라 예상과 다른 활성을 나타내기도 한다. 산화방지제를 활용하여 최종제품의 유통기한을 증가시키기 위해서는 실제 활용될 제품의 매질로 사용해야 한다.

• 유통과학연구
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• 제19권4호
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• pp.53-60
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• 2021

Purpose: This study focuses on exploring ways to improve the distribution method of shrimp farming so that it is eco-friendly and increases the distribution of shrimp. Research design, data and methodology: The experimental device installed in a biofloc shrimp culture in one area tested 10 times. Complex odor, concentration of H2S, water quality improvement effected by decomposition of organic substances, and degree of microbial activation measured. The data of the experimental results verified using the T-test technique, and the p value was determined based on the significance probability of 0.05. Results: This experimental device was effective in reducing odor and hydrogen sulfide in shrimp farms. With the improvement of water quality, dissolved oxygen increased due to the microbubble and cavitation action of air ejector and ultrasonic waves. In addition, the cultured microorganisms in the cultured water treated by the experimental device were remarkably proliferated compared to the raw water. Conclusions: The biofloc distribution method has a significant effect on improving water quality and reducing odor substances and will become a new eco-friendly and efficient distribution method for shrimp farming in the future.

• Nuclear Engineering and Technology
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• 제54권9호
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• pp.3215-3224
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• 2022

Latest studies found that for 316LN austenitic stainless steel (ASS), its LCF life decreased noticeably in high temperature water containing a great amount of dissolved oxygen (DO) (2 ppm DO), compared with that in the water containing 50 or 100 ppb DO. This finding is different from previous studies about ASSs. This study confirmed that the 316L had similar behavior to 316LN. The LCF life of 316L in water containing 1000 ppb DO water was considerably shorter than that in the water containing 50 ppb DO. Addition of boric acid & lithium hydroxide and pre-soaking did not display noticeable effects on the LCF life of this material in the water with 1000 ppb DO, indicating the discrepancy between the latest studies and previous studies was not caused by the boric acid & lithium hydroxide and pre-soaking. This study also confirmed that similar to 316LN, when a certain amount of DO was added into the water, the amount of hydrogen absorbed into the material decreased significantly compared with that when the DO was less than 5 ppb.

• Nuclear Engineering and Technology
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• 제55권3호
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• pp.801-813
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• 2023

The events at Three Mile Island in the United States brought about fundamental changes in the ways that simulation would be used in nuclear operations. The need for research simulators was identified to scientifically study human-centered risk and make recommendations for process control system designs. This paper documents the human factors research conducted at the Human Systems and Simulation Laboratory (HSSL) since its inception in 2010 at Idaho National Laboratory. The facility's primary purposes are to provide support to utilities for system upgrades and to validate modernized control room concepts. In the last decade, however, as nuclear industry needs have evolved, so too have the purposes of the HSSL. Thus, beyond control room modernization, human factors researchers have evaluated the security of nuclear infrastructure from cyber adversaries and evaluated human-in-the-loop simulations for joint operations with an integrated hydrogen generation plant. Lastly, our review presents research using human reliability analysis techniques with data collected from HSSL-based studies and concludes with potential future directions for the HSSL, including severe accident management and advanced control room technologies.

• International journal of advanced smart convergence
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• 제12권2호
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• pp.47-55
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• 2023

The automotive industry is undergoing a paradigm shift due to the convergence of IT and rapid digital transformation. Various components, including embedded structures and systems with complex architectures that incorporate IC semiconductors, are being integrated and modularized. As a result, there has been a significant increase in vehicle defects, raising expectations for the quality of automotive parts. As more and more data is being accumulated, there is an active effort to go beyond traditional reliability analysis methods and apply machine learning models based on the accumulated big data. However, there are still not many cases where machine learning is used in product development to identify factors of defects in performance and durability of products and incorporate feedback into the design to improve product quality. In this paper, we applied a prediction algorithm to the defects of automotive door devices equipped with automatic responsive sensors, which are commonly installed in recent electric and hydrogen vehicles. To do so, we selected test items, built a measurement emulation system for data acquisition, and conducted comparative evaluations by applying different machine learning algorithms to the measured data. The results in terms of R² score were as follows: Ordinary multiple regression 0.96, Ridge regression 0.95, Lasso regression 0.89, Elastic regression 0.91.

• Nuclear Engineering and Technology
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• 제56권3호
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• pp.966-972
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• 2024

Idaho National Laboratory (INL) announced at COP27 it would reach net zero greenhouse gas (GHG) emissions by 2031. As a Nuclear, Energy and Environment, and National Homeland Security laboratory, the predominant solution to closing the clean energy gap will include nuclear as a safe, clean, reliable and affordable electricity source with the additional benefit of producing heat and hydrogen to fuel INL's large transportation fleet. INL's collaboration first vs. competition is essential to the program's success. The focused actions in INL's Nuclear Roadmap include: Infrastructure, Licensing/Regulatory, Financial, Time to Market, Fuel Cycle and Public Confidence/Communications. The roadmap also includes nuclear technology innovations and creative partnerships with utility providers, regulators, businesses, community members, and Indigenous Peoples to accelerate deployment of advanced reactors. Through development of the Net-Zero Nuclear Roadmap, INL will offer a model to provide safe and secure energy for the nation and the world by: (1) establishing the necessary infrastructure on its 890-square mile site to support demonstration, (2) showing proven pathways through the licensing and regulation process, (3) partnering with utilities to ensure commercial application, and (4) collaborating with industry to site new technologies.

• 한국식품영양과학회지
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• 제34권9호
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• pp.1297-1301
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• 2005

활나물의 항산화 효과를 측정하기 위하여 잎, 줄기, 뿌리 및 종자의 부위 별로 분리하여 methylen chloride와 ethanol 혼합용매에 의해 추출하였다. 활나물의 부위로 추출수율은 줄기 $4.47\%$, 잎 $3.95\%$, 종자 $2.90\%$, 뿌리 $2.67\%$의 순으로 줄기 부분의 추출수율이 가장 높았다. 총 페놀성 화합물 함량은 잎 2.98, 뿌리 2.34, 종자 2.26, 줄기 2.11 mg/mL로 잎추출물에서 가장 높았다. SOD 유사활성은 잎 추출물의 활성이 $86.27\%$로 가장 높았으며, 줄기와 뿌리 추출물은 각각 56.32, $50.29\%$이었으며, 종자 추출물은 경우 $16.82\%$로 가장 낮았다. 잎, 줄기, 뿌리 추출물의 SOD 유사활성은 천연항산화제 인 tocopherol보다 매우 높았다. 활나물 부위별 추출물의 전자공여능은 잎과 줄기 추출물에서 각각 16.87, $16.06\%$로 매우 높았으며, 뿌리 추출물과 종자 추출물이 각각 11.13, $9.31\%$로 tocopherol $9.28\%$보다 높았다. 활나물 부위별 추출물에 대한 hydroxy radical 소거 활성은 잎 추출물에서 $42.90\%$로 가장 높게 나타났고, 줄기, 종자, 뿌리 추출물은 각각 41.03, 37.80, $37.62\%$이었으며, 천연항산화제 인 tocopherol $32.38\%$ 이 가장 낮은 결과를 보여주었다. 종자 추출물의 hydrogen radical 소거능이 $53.51\%$로 가장 높게 나타났으며, tocopherol의 $53.81\%$와 비슷한 활성 수준을 보여 주었다. 따라서 활나물 부위 별 추출물의 항산화 효과를 측정한 결과 잎 추출물이 가장 항산화 활성이 높았으며, 활나물은 천연항산화제로의 개발 가능성이 있음을 확인할 수 있었다.