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증례 : 내분비-대사 ; 부신수질증식증이 동반된 알도스테론 분비 부신피질선종 1예
이향선 ( Hyang Sun Lee ),김건우 ( Gun Woo Kim ),김재현 ( Jae Hyun Kim ),이미영 ( Mi Young Lee ),엄민섭 ( Min Sub Eum ),신영구 ( Young Goo Shin ),정춘희 ( Choon Hee Chung ) 대한내과학회 2011 대한내과학회지 Vol.81 No.3
부신피질과 수질은 서로 다른 기원과 기능을 가지고 있으나 드물게 혼합된 임상소견을 보이는 경우가 보고되고 있다. 저자 등은 갈색세포종의 증상을 보여 시행한 호르몬 검사상 알도스테론 분비 부신피질선종의 소견을 보인 환자에서 수술 후 병리 조직 소견상 부신피질선종과 부신수질증식증이 동반된 드문 경우가 있어 문헌고찰과 함께 국내에서 처음으로 보고하는 바이다. The relationship between the adrenal cortex and medulla has been studied since the 1960s. Rarely, a patient with an adrenal cortical adenoma presents with the findings of pheochromocytoma. However, there has been no report of a case with the clinical features of pheochromocytoma showing the pathological features of an adrenal cortical adenoma with medullary hyperplasia on histological examination. We report a 59-year-old-man who was shown to have an adrenal cortical adenoma, with medullary hyperplasia, during a diagnostic work up for pheochromocytoma. (Korean J Med 2011;81:393-396)
붕사 희석액 농도에 따른 시멘트 페이스트의 레올로지적 분석
이향선 ( Lee Hyang-sun ),이유정 ( Lee Yu-jeong ),한동엽 ( Han Dong-yeop ) 한국건축시공학회 2019 한국건축시공학회 학술발표대회 논문집 Vol.19 No.1
Concrete with high thixotropy has a lower plastic viscosity when pour in, thus demonstrating fluidity, and After poured, the viscosity can be restored again to ensure stable progress without additional liquidity and material separation. Therefore, in this study, a basic study of thixotropy of concrete was proceeded through cross-linked bond of PVA and Borax. Therefore, it is judgment that the higher the concentration of boron solutions, the higher the strength of the interconnections between PVA and boron.
건설폐기물을 활용한 이산화탄소 반응경화 시멘트 제조에 관한 연구
이향선 ( Lee Hyang-sun ),손배근 ( Son Bae-geun ),송훈 ( Song Hun ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
In the domestic industrial sector, greenhouse gases emitted from the cement industry account for about 10%, with most of them generated during the cement clinker calcination process. During the calcination process, 57% of carbon dioxide is emitted from the decarbonation reaction of limestone, 30% from fuel consumption, and 13% from electricity usage. In response to these issues, the cement industry is making efforts to reduce carbon dioxide emissions by developing technologies for raw material substitution and conversion, improving process efficiency by utilizing low-carbon alternative heat sources, developing CO<sub>2</sub> capture and utilization technologies, and recycling waste materials. In addition, due to the limitations in purchasing and storing industrial byproducts generated from industrial facilities, many studies are underway regarding the recycling of construction waste. Therefore, this study analyzes the manufacture of calcium silicate cement (CSC), which can store carbon dioxide as carbonate minerals in industrial facilities, and aims to contribute to the development of environmentally friendly regenerated cement using construction waste.
PVA 및 붕사를 사용한 고요변성 시멘트 계열 재료 제조를 위한 기초 물성 분석
이향선 ( Lee Hyang-sun ),이유정 ( Lee You-jung ),이영준 ( Lee Young-jun ),한동엽 ( Han Dongyeop ) 한국건축시공학회 2020 한국건축시공학회지 Vol.20 No.3
본 연구의 목적은 시멘트 계열재료에 요변성을 부여하기 위하는 것이다. 이를 위해 PVA와 붕사의 결합을 이용하였다. 즉, PVA와 붕사 수용액을 시멘트 페이스트에 첨가하여 PVA 및 붕사의 결합에 의한 요변성 발현여부를 확인하였다. 시멘트계열 재료에서 요변성 발현은 시공과정에서 다양한 이점을 확보할 수 있으며 특히 최근 주된 타설 방법인 관을 사용한 타설방법에서 유리하게 작용할 수 있다. 본 연구의 결과로써 시멘트 페이스트 내부에서 PVA와 붕사의 결합이 유효하다는 것을 알 수 있었다. 결과적으로 시멘트 계열 재료에 대하여 PVA와 붕사를 이용하여 요변성을 부여할 수 있었다. 향후 본 연구의 결과를 이용하여 다양한 형태의 시멘트 계열재료의 시공성 개선에 도움이 될 것으로 기대한다. The aim of the research is to provide thixotropy on cement-based materials. For this purpose, the linkage between polyvinyl alcohol (PVA) and borax was used. Namely, adding the suspensions of PVA and borax in cement paste, the thixotropy of cement paste was confirmed. The thixotropy of cement-based materials can have various advantages on construction process, especially, the placing method using pipe can have advantages. As a result of this research, the linkage between PVA and borax is valid inside of cement paste. Therefore, using PVA and borax, it is confirmed that the cement-based materials can have thixotropy with this method, and it can be expected to contribute on developing new method of placing cement-based materials with thixotropy.
칼슘 실리케이트 시멘트의 CO₂ 양생에 따른 탄산화 광물상 및 압축강도 분석
이향선(Lee, Hyang-Sun),송훈(Song, Hun) 대한건축학회 2023 대한건축학회논문집 Vol.39 No.10
The cement industry is responsible for approximately 10% of greenhouse gas (GHG) emissions in the industrial sector, with most emissions occurring during the cement clinker production process. To address this issue, the cement industry is making efforts to reduce GHG emissions by developing technologies such as raw material substitution, improving process efficiency using new low-carbon heat sources, and employing CO₂ capture and utilization techniques. This study conducted foundational experiments to contribute to the reduction of CO₂ emissions in the cement industry by utilizing a CO₂ recycling technology called mineral carbonation. In this study, calcium silicate cement(CSC) was manufactured at the laboratory scale to convert CO₂ into a mineral form, and analysis was performed on the carbonate mineral phase and strength development. The manufacturing and analysis results of CSC clinker confirmed the formation of key minerals, namely wollastonite and rankinite. Furthermore, through CO₂ curing of CSC, carbonate minerals including calcite and aragonite were formed. The compressive strength measurements of carbonated CSC paste specimens confirmed the development of strength. In conclusion, this study demonstrates the feasibility of CSC production and the manifestation of compressive strength through CO₂ generation, contributing to the potential reduction of CO₂ emissions in the cement industry.
폐콘크리트 미분말을 활용한 이산화탄소 반응경화 시멘트 제조
이향선 ( Lee Hyang-sun ),송훈 ( Song Hun ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.2
In the cement industry, various research initiatives are underway to achieve carbon neutrality. Mineral carbonation is a technology that converts carbon dioxide into minerals for storage, and CO<sub>2</sub> reactive hardening cement is a type of cement that incorporates mineral carbonation technology. In this study, we aimed to manufacture CO<sub>2</sub> reactive hardening cement for reducing carbon emissions in the cement industry by utilizing waste concrete powder generated in the construction sector.