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전남 압해도 백악기 달리도층에서 산출된 이매패류의 분류 및 생층서학적 연구
이동윤(Dong-Yub Lee),최병도(Byung-Do Choi),김치우(Chi-Woo Kim),정종윤(Jong-Yun Jung),허민(Min Huh) 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10
전라남도 신안군 압해도에 위치한 백악기 달리도층의 노두에서 다수의 담수 이매패 Nagdongia 가 복족류 및 개형충 화석과 함께 산출되어 이에 대한 형태·분류학적 및 생층서학적 해석을 진행하였다. 기존 연구(김유홍 외, 2014)에서는 달리도층에서 산출되는 이매패류를 외형의 다양성을 통해 Nagdongia sp.로 동정하였지만 추가적인 연구가 진행되지는 않았다. 달리도층의 이매패류는 국내 다른 지역에서 보고된 중생대 이매패류 화석과의 형태적 비교분석을 통해 Nagdongia 속으로 파악할 수 있었다. 추가적인 통계적 분석에 의하면 기존에 보고된 Nagdongia soni 와 Nagdongia leei 와는 일치하지 않지만, Nagdongia soni 의 근연종으로 추정된다. 달리도층의 연대는 기존 연구에서는 N. soni 의 산출 층서를 근거하여 전기 백악기로 보고 된 바 있다. 하지만 하부 일성산층의 공룡알과 상부 매월리응회암의 절대연령 및 달리도층의 개형충, 그리고 일본에서 Nagdongia 속이 산출된 지층과의 대비를 통해 달리도층의 연대를 Albian 중기에서 Cenomanian으로 재해석하였다. 더 나아가 Nagdongia 속의 생존범위가 최대 Cenomanian까지 확장될 수 있음을 확인하였다.
윤성재 ( Yun Seong Jae ),박경호 ( Park Gyeong Ho ),성환태 ( Seong Hwan Tae ),이동윤 ( Lee Do Yun ),한정호 ( Han Jeong Ho ),이일수 ( Lee Il Su ) 대한피부과학회 2004 대한피부과학회지 Vol.42 No.3
N/A Background: Dermatofibromas are common benign tumors which occur in the skin. They have been divided into fibrous lesions, composed entirely or almost entirely of fibroblasts and collagen, and cellular lesions composed to a significant degree of phagocytic cells with the appearance of histiocytes. A cellular variant characterized by increased cellularity, storiform arrangement, larger size, and location in the deep dermis, often with extension into the superficial subcutaneous tissue may be difficult to differentiate from dermatofibrosarcoma protuberans. There is an incessant controversy over the histogenesis of dermatofibromas, although many authors consider that these tumors derive from primitive mesenchymal cells. The recent development in immunohistochemical staining technology and ultrastructural study revealed various cellular proliferation in the lesion, including fibroblast, histiocyte and myofibroblast. Objective: Our purpose was to study by immunohistochemistry the differences between fibrous and cellular dermatofibromas and to find the relationship between the myofibroblast and the histogenesis of dermatofibroma. Methods: We will select 36 cases of dermatofibromas which include 27 fibrous and 9 cellular types. We have studied the immunophenotype of 36 dermatofibromas using antibodies against vimentin, smooth muscle actin, desmin, CD34, factor XⅢa, CD68 and MMP 11. Results: All dermatofibromas were positive for vimentin, smooth muscle actin, and factor XⅢa, but negative for desmin and CD34. All cellular type were positive for CD68, but 24/27 of the fibrous type were positive for CD68. MMP 11 was positive in 6/9 of the cellular type and 25/27 of the fibrous type. The degree of staining for vimentin, factor XⅢa, CD68, and MMP 11 was not different in both types. But the degree of staining for smooth muscle actin in the fibrous type was higher than in the cellular type. Conclusion: The differences in the degree of staining for smooth muscle actin and the positivity for CD68 suggest the possibility of a different differentiation of dermatofibroma between cellular and fibrous types. the prominent vimentin and smooth muscle actin immunoreactivity and desmin non-reactivity may suggest that the myofibroblast may play a role, in part, for developing dermatofibromas. Further investigations with ultrastructural study using electron microscopy and double/triple immunohistochemical staining would be necessary. (Korean J Dermatol 2004;42(3):256~263)
초고층 건물의 제연영향요소에 따른 수직피난공간 압력분포 시뮬레이션
최승혁(Seung Hyuck Choi),이동윤(Dong Yun Lee),전현도(Hyun Do Jun),박진철 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
These days, the super high-rise buildings construction plans are increased in Korea. But the stack effect in the super high-rise building interrupts the smoke control system's operation because of pressure difference, so it is more dangerous than the general building when firing. Therefore it needs to study about the pressure difference in the super high-rise buildings. We research the smoke control influence factor in the super high-rise building. Reflecting the influence factor, the simulation is practiced the case by case.
고강도 강판 저항 점용접부 강도 및 파단에 미치는 Paint Baking의 영향
최철영 ( Chul Young Choi ),이동윤 ( Dong Yun Lee ),김인배 ( In Bae Kim ),김양도 ( Yang Do Kim ),박영도 ( Yeong Do Park ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.12
Conventional fracture tests of resistance spot welds have been performed without consideration of the paint baking process in the automobile manufacturing line. The aim of this paper is to investigate the effect of the paint baking process on load carrying capacity and fracture mode for resistance spot welded 590 dual phase (DP), 780DP, 980DP, 590 transformation in duced plasticity (TRIP), 780TRIP and 1180 complex phase (CP) steels. With paint baking after resistance spot welding, the l-shape tensile test (LTT) and nano-indentation test were conducted on the as-welded and paint baked samples. Paint baking increased the load-carrying capacity of the resistance spot welded samples and improved the fracture appearance from partial interfacial fracture (PIF) to button fracture (BF). Improvement in fracture appearance after LTT is observed on weldments of 780 MPa grade TRIP steels, especially in the low welding current range with paint baking conditions. The higher carbon contents (or carbon equivalent) are attributed to the low weldability of the resistance spot welding of high strength steels. Improvement of the fracture mode and load carrying ability has been achieved with ferrite hardening and carbide formation during the paint baking process. The average nano-indentation hardness profile for each weld zone shows hardening of the base metal and softening of the heat affected zone (HAZ) and the weld metal, which proves that microstructural changes occur during low temperature heat treatment.
이재빈(Jae Bin Lee),김도영(Do Young Kim),남기범(KiBeom Nam),서관호(Kwan Ho Seo),이동윤(Dong Yun Lee) 한국고분자학회 2020 폴리머 Vol.44 No.5
Poly(lactic acid)(PLA)는 생분해성 고분자로 환경 정책의 강화와 지속 가능한 플라스틱에 대한 관심의 증가로 최근 사용량이 증가하고 있다. 하지만, 소재 특유의 취성과 낮은 용융 강도를 가지고 있으며, 내열성과 내충격성에 취약하여 기계적 특성이 요구되는 소재로 사용이 제한적이다. 본 연구에서는 poly(lactic acid)/poly(butylene adipateco-terephthalate) 블렌드의 상용성과 내충격성을 보완하기 위해 poly(butyl acrylate)(PBA)를 함량별로 첨가하고, 이들의 열적, 동적 점탄성, 구조, 기계적 및 충격강도 특성을 분석하였다. 그 결과 PBA는 상용화제로 작용하고, 블렌드 구조를 co-continuous 형태로 변화시켜 충격강도가 최대 2.2배까지 증가하였다. 따라서 PLA 기반 내충격성이 개선된 지속가능한 플라스틱 소재로의 활용 가능성을 확인하였다. Poly(lactic acid) (PLA) is a biodegradable polymer, which has been increased in usage due to strengthening environmental policy and increased interest in sustainable plastics. However, it has inherent shortcomings such as brittleness, low melt strength, heat resistance, and impact resistance, which limited widespread applications for requiring mechanical properties. In this study, to improve the compatibility and impact resistance of the PLA, the poly(butyl acrylate) (PBA) was introduced into the PLA/poly(butylene adipate-co-terephthalate) (PBAT) blends. In addition, the thermal, dynamic viscoelastic, morphological, mechanical and impact strength characteristics of the composite were analyzed. As a result, it was demonstrated that the impact strength was increased up to 2.2 times because PBA acted as a compatibilizer for PLA/PBAT blends and formed the co-continuous morphology. Therefore, we confirmed the applicability of sustainable plastics through improving the impact strength of PLA-based biodegradable materials.
불소 실리콘/실리콘 고무의 장기 열 노화 및 내유성에 대한 블렌드 비율의 영향
박해윤(Hae Youn Park),김태희(Tae Hee Kim),김도영(Do Young Kim),서관호(Kwan Ho Seo),강동국(Hye Young Kim),김혜영(Hye Young Kim),이동윤(Dong Yun Lee) 한국고분자학회 2022 폴리머 Vol.46 No.1
본 연구에서는 불소 실리콘 고무(FVMQ)와 실리콘 고무(VMQ)를 블렌드 비율에 따라 혼합하여 제조하고 가공성 및 상용성, 영구 압축 줄음률, 장기 내열성, 내유성을 종합적으로 평가하였다. 무빙 다이 레오미터와 무니 점도계 측정을 통해 가교 시스템을 확인하였으며, VMQ 함량이 증가할수록 가공성이 향상되었다. 또한, 주사전자현미경을 통해 FVMQ와 VMQ의 상용성을 확인하였다. FVMQ의 비율이 증가할수록 파단신율이 증가하였으며, 내유성은 시험유의 종류와 FVMQ/VMQ의 블렌드 비율에 영향을 받는 것으로 나타났다. 따라서 이 연구의 결과는 장기적인 열노화 및 내유성을 위한 FVMQ/VMQ 제품 개발 및 응용에 적용 가능할 것으로 기대된다. In this study, fluorosilicone rubber (FVMQ) and silicone rubber (VMQ) blends were prepared depending on the blend ratio. The processability and compatibility, compression set, long-term heat resistance, and oil resistance of the blends were comprehensively evaluated. It was confirmed to have a similar crosslinking system and improve the processability of the blend with increasing ratio of VMQ by the moving-die rheometer and Mooney viscometer measurements. In addition, the compatibility of FVMQ and VMQ was found by using scanning electron microscopy. As the ratio of FVMQ increased, the elongation at break increased, and the oil resistance was affected by the correlation between the type of the test oil and blend ratio of FVMQ/VMQ. Therefore, the results of this study are applicable to the development and application of FVMQ/VMQ products for long-term thermal aging and oil resistance.