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6가 크롬 제거를 위한 나노셀룰로오스/PEI 하이브리드 비드의 제조 및 특성분석
박진석 ( Jin Seok Park ),김정규 ( Jung Kyu Kim ),김윤진 ( Yun Jin Kim ),방준식 ( Jun Sik Bang ),곽효원 ( Hyo Won Kwak ) 한국목재공학회 2020 한국목재공학회 학술발표논문집 Vol.2020 No.1
지구상에서 가장 풍부한 바이오폴리머인 셀룰로오스는 원료의 풍부함, 수산기와 같은 기능기의 보유 및 우수한 기계적 성질을 가지고 있어 친환경 재료로써 많은 연구가 진행되어오고 있다. 최근에는 나노스케일의 모폴로지를 가지고 있는 나노셀룰로오스에 대한 관심이 증가하고 있는데 이는 기존의 셀룰로오스 대비 넓은 표면적 및 우수한 보강효과, 그리고 수분 환경에서의 이용가능성을 가지고 있어 다양한 산업분야에서 이용가능성이 대두되고 있다. 하지만 섬유 및 비드를 포함한 고분자 재료로의 성형성에 한계가 있다는 단점은 나노셀룰로오스의 폭넓은 활용을 제한해왔다. 본 연구에서는 Carboxymethylated cellulose nanofibril (CMCNF)를 사용하여 구형 입자를 제조하고, 입자 표면을 양이온성 PEI로 개질하여 6가 크롬의 흡착제로 이용 가능성을 조사하였다. CMCNF는 기존의 CNF에 비해 우수한 형태 안정성을 보였으며, FTIR, XPS, elemental analysis 의 방법을 통해서 PEI 도입을 확인하였다. 또한 Zeta potential 분석결과 PEI/CMCNF 흡착제의 표면에 풍부한 양전하 기능기가 도입되었음을 확인하였다. 그 결과 PEI/CMCNF 흡착제는 1,300mg/g의 우수한 6가 크롬 제거 용량을 보였으며, ‘adsorption-coupled reduction’ 메커니즘에 의하여 6가 크롬의 제거가 발생함을 확인하였다.
알루미늄 1xxx 계열 2겹 복합판재의 기계적 특성 평가
조준행(Jun-Haeng Cho),최원호(Won-Ho Choi),박진석(Jin-Seok Park) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Auto parts industry development trend of eco-friendly vehicles, depending on the car body and lightweight chassis components are demand constantly. In particular, heat protector part of automotive exhaust system muffler is changed to aluminum from the existing SACD material, and studies for applying the sheet of multilayer structure have been actively carried out. However, composite panel made o f two sheet of aluminum have problem that fastening force is low. It is may give rise to serious trouble when the press forming. sheet material can cause separation. Therefore, in this study, composite sheet of multilayer was developed and conduct a mechanical performance test. test was done tensile strenght and peel strength according to the directionality of sheet. Result of mechanical performance test was used to concluding.
조준행(Jun-Haeng Cho),최원호(Won-Ho Choi),박진석(Jin-Seok Park) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
The heat protector is part applied to the engine and under body to block the heat. Recently, heat protector has demanded to lightweight and high NVH performance like heat shield and vibration reduction. To meet requirements, material of heat protector part is changed to aluminum from SACD material. Also heat protector part is applying to composite panel made by two aluminum sheet. Composite panel made by two aluminum sheet has high performance in the heat shield and noise vibration reduction. However It is highly vulnerable to vibration from joint assembly with car body. So, we developed aluminum two composite panel has air pocket in the between sheet. also evaluated on the vibration fatigue for composite panel. Result of vibration fatigue performance test was used to concluding.
손준광 ( Jun Gwang Son ),김성호 ( Seong Ho Kim ),선제형 ( Jae Hyung Sun ),박진석 ( Jin Seok Park ),김유일 ( Yu Il Kim ),이숭 ( Soong Lee ),신정현 ( Jung Hyun Shin ) 대한내과학회 2005 대한내과학회지 Vol.69 No.-
Signet ring cell carcinoma (SRCC) is a unique subtype of adenocarcinoma that is characterized by abundant intracellular mucin accumulation. SRCC can arise in various organs, including stomach, colon, breast, bladder, and prostate. SRCC can also arise as a primary lung tumor, but its incidence is low, ranging from 0.14% to 1.9% in the reported series. Therefore, SRCC in the lung is generally believed to be metastatic. But, recent several immunohistochemical studies have demonstrated that thyroid transcription factor-1 (TTF-1), cytokeratins 7 and 20 are specific markers for SRCC arising in the lung. We report a case of pulmonary SRCC with immunohistochemical characterization in a 54-year-old male. Chest X-ray and chest computed tomography (CT) scan showed a homogeneous mass, approximately 3 cm in diameter and subcarinal lymphadenopathy of left perihilar region. The tumor cells were mainly composed of signet-ring cells and strongly demonstrated cytokeratins (7+/20-). The investigations of whole body failed to reveal any other tumor. On the basis of immunohistochemical studies, we concluded that the tumor was SRCC arising in the lung. (Korean J Med 69:S830-S834, 2005)