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Measurement of Alpha Radiation Dose in Uranium-using Facility
Seonho Noh,Youngwoo Kwon,Youngsang Lee 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.2
The Korea Atomic Energy Research Institute operates the Nuclear Cycle Experimental Research Facility which has radiation controlled area in the laboratory with the aim of realizing pyroprocessing technology. In this Facility, depleted Uranium feed material and a depleted Uranium mixed with some surrogate material are used for performing experiments. Therefore the facility is using uranium, users should be careful of radiation. This paper will explain the radiation protection of the Nuclear Cycle Experimental Research facility and will also explain how much alpha radiation comes out from the facility. The RMS (Radiation Monitoring System) detector is made by CANBERRA and the model name is ICAM. ICAM RMS is the detector which can detect Alpha Radiation by absorbing the air in the facility. The RMS detector is installed in the HVAC room on the third floor to check the air contamination through the chimney. The RMS is connected to the air ventilation line for detecting Alpha radiation in the whole facility. Experiment was performed for two weeks to check the radiation level and the air ventilation fan continued to operate 24 hours a day. the results are below the required value which is 0.1 Bq/m3, indicating that the facility is safe in terms of radiation safety management.
SiC 복합체 보호막 금속 피복관의 개발 및 고온산화 특성 분석
노선호(Seonho Noh),이동희(Dong-hee Lee),박광헌(Kwangheon Park) 한국표면공학회 2015 한국표면공학회지 Vol.48 No.5
The goal of this study is to investigate a metal cladding that contains SiC composites as a protective layer and analysis the characteristics of the specimens on high temperature oxidation To make SiC composites, the current process needs a high temperature (about 1100℃) for the infiltration of fixing materials such as SiC. To improve this situation, we need a low temperature process. In this study, we developed a low temperature process for making SiC composites on the metal layer, and we have made two kinds: cladding with protective SiC composites made by polycarbosilane(PCS), and a PCS filling method using supercritical carbon dioxide. A corrosion test at 1200℃ in a mixed steam and Ar atmosphere was performed on these specimens. The result show that the cladding with protective SiC composites have excellent oxidation suprression rates. This study can be said to have developed new metal cladding with enhanced durability by using SiC composite as protective films of metal cladding instead of simple coating film.
Noh, Hwa Jung,Im, A-Rang,Kim, Hyun-Seok,Sohng, Jae Kyung,Kim, Chong-Kook,Kim, Yeong Shik,Cho, Seonho,Park, Youmie American Scientific Publishers 2012 Journal of nanoscience and nanotechnology Vol.12 No.5
<P>The resistance to current antibiotics results in the emergence of health-threatening bacteria. Silver nanoparticles are known to exhibit broad-spectrum antibacterial activities without the development of resistance. Herein, we developed a green synthetic method for the preparation of silver nanoparticles with sialyllactose instead of toxic chemicals as a reducing agent, which would improve its therapeutic applicability and increase its biocompatibility. Oven incubation, autoclaving and microwave irradiation methods were applied to prepare the silver nanoparticles. High resolution-transmission electron microscopy and atomic force microscopy images revealed mostly spherical and amorphous silver nanoparticles with an average diameter of 23.64 nm. Fourier Transform-infrared spectra suggest that the N-H amide of sialyllactose might be involved in the binding of silver nanoparticles. Based on thermogravimetric analyses, 2,3-sialyllactose-reduced silver nanoparticles are composed of 54.3 wt% organic components and 45.7 wt% metallic silver. Enhanced antibacterial activities of silver nanoparticles (approximately 8-fold) were observed against Pseudomonas aeruginosa, Escherichia coli and Salmonella typhimurium (minimum inhibitory concentration 16 microg/mL). Next, we employed the use of carbohydrate stabilizers to increase the stability of silver nanoparticles during a freeze-drying process. It was found that sucrose and trehalose were the most effective stabilizers. In addition, silver nanoparticles possessed excellent salt stability as well as on-the-shelf stability in the presence of these stabilizers. Derivatives of sialic acid are known to be anti-influenza agents; therefore, the newly prepared silver nanoparticles may serve as useful antibacterial and antiviral agents to cope with both pathogenic bacteria and viruses in the near future.</P>
Biogenic silver nanoparticles with chlorogenic acid as a bioreducing agent.
Noh, Hwa Jung,Kim, Hyun-Seok,Jun, Sang Hui,Kang, Young-Hwa,Cho, Seonho,Park, Youmie American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.8
<P>We report the synthesis of biogenic silver nanoparticles using chlorogenic acid as a bioreducing agent. Chlorogenic acid is a polyphenol compound abundant in coffee. UV-Vis spectra showed the characteristic surface plasmon resonance band at 415 nm, indicating the successful synthesis of biogenic silver nanoparticles. Spherical and irregular shaped nanoparticles were observed with an average diameter of 19.29 +/- 8.23 nm. The reaction yield from silver ion to silver nanoparticles was observed as 95.43% by using inductively coupled plasma-mass spectrometry. Fourier transform infrared spectra revealed that the -C = O groups of chlorogenic acid may coordinate or complex into silver nanoparticles. Biogenic silver nanoparticles exerted higher antibacterial activity against Gram-negative bacteria than against Gram-positive bacteria. Interestingly, a comparable antibacterial activity to a standard antibiotic was observed against two strains of Pseudomonas aeruginosa (minimum inhibitory concentration of 0.66 microg/mL). The synergistic effect of a combination of silver nanoparticles and chlorogenic acid on antibacterial activity is obvious, leading to approximately 8-fold enhancement in the case of Pseudomonas aeruginosa when compared with chlorogenic acid alone. The present report suggests that a pure compound with a plant origin is capable of being a bioreducing agent for the synthesis of biogenic silver nanoparticles with superior antibacterial activity, opening up many applications in nanomedicine and nanobiotechnology.</P>
Melamine nanosensing with chondroitin sulfate-reduced gold nanoparticles.
Noh, Hwa Jung,Kim, Hyun-Seok,Cho, Seonho,Park, Youmie American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.12
<P>Gold nanoparticles were green-synthesized using a glycosaminoglycan, chondroitin sulfate, as the reducing agent by mixing Au3+ and chondroitin sulfate under heating. Chondroitin sulfate-reduced gold nanoparticles were characterized by UV-Vis spectrophotometry, high resolution transmission electron microscopy and atomic force microscopy. The yield of Au3+ to Au0 was measured as 80.1% by inductively coupled plasma-atomic emission spectroscopy. A mostly spherical shape, with an average diameter of 44.68 +/- 11.25 nm, was observed from the atomic force microscopy images. Using chondroitin sulfate-reduced gold nanoparticles, we developed a melamine nanosensor that provides a simplified method to detect melamine in infant formula. With an increase in the melamine concentration in the gold nanoparticle solution, the characteristic surface plasmon resonance band of gold nanoparticles at 530 nm decreased, whereas a new peak appeared at 620 nm. There was a linear relationship between the absorbance ratio (A620/A530) and the melamine concentration in the range of 0.1-10 microM. The practical use of the proposed method was verified by quantifying melamine spiked in real infant formula at concentrations as low as 12.6 ppb. The nanosensing of melamine using chondroitin sulfate-reduced gold nanoparticles can be a promising technique for quick on-site melamine screening of milk products.</P>
공동체 활성화를 위한 마을기업 및 관광단지 제안 연구 - 안성시 성남옥천지구 도시재생 활성화지역을 중심으로
노병우(Noh, Byeong Woo),김선호(Kim, Seonho),고운지(Go, Unji),조용훈(Cho, Yonghoon),이지은(Lee, Jeeun) 한국주거학회 2021 한국주거학회 학술대회논문집 Vol.33 No.2
Anseong City, which was one of the three major cities in the Joseon Dynasty, has begun to decline and shrink. Accordingly, the government is carrying out the 2020 urban regeneration project and has selected the Seongnam Okcheon district in Anseong City as a place for a priority project. Anseong City has a number of natural and cultural assets. For example, it has vast plains and unique products such as rice, grapes, pears, Korean beef, and ginseng. Moreover, the city has natural scenery such as Anseongcheon Stream, Geumgwang Lake, and Gosam Lake. In this respect, as a proper strategy for the urban regeneration of the Seongnam Okcheon district, we would like to establish a tourism destination by making a small town business, which comprises of 1. Railroad Town, 2. Eojetgil Station, 3. Eojetgil Town. In other words, we aim to make space for advertising, selling, and promoting the unique local resources by its residents. Specifically, first, in the case of Railroad Town, we established guest houses and cafe streets by utilizing the locational advantage of being the entrance to the Seongnam Okcheon district and the old railroad tracks. Second, for Eojetgil Station, we used the old site of Anseong Station to create an exhibition hall showing the Anseong’s unique products while creating a plaza linked to Anseongcheon Stream to revitalize the waterfront space. Lastly, in the case of Eojetgil Town, we remodeled the old houses into community centers and shared houses to create spaces for residents. As a result, our project aims to increase local productivity by attracting young people and providing a community space to allow residents to participate actively.