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- 저자 : 강민철 ( Min Chul Kang ) (검색결과 70 건)
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강민철(Kang Min Chul),한상윤(Han Sang Yun),임남형(Lim Nam Hyoung),박종섭(Park Jong Sup),한택희(Han Taek Hee),강영종(Kang Young Jong) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
The analysis of interaction has been carried out by using foreign codes(UIC 774-3 R code of Europe etc.) because there is no code about interaction between track and bridge in Korea. But interaction between curved track and bridge was not mentioned by these foreign codes. Curved track is different from straight track because centrifugal force acts on the curved track and lateral displacement was caused in the curved track. This paper presents how to analyze interaction between curved track and bridge.
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강민철(Min Chul Kang),김휘강(Huy Kang Kim) 한국정보보호학회 2018 정보보호학회논문지 Vol.28 No.4
악성코드의 수가 가파르게 증가하면서 기업 및 공공기관, 금융기관, 병·의원 등을 타깃으로 한 사이버 공격 피해사례가 늘어나고 있다. 이러한 흐름에 따라 학계와 보안 업계에서는 악성코드 탐지를 위한 다양한 연구를 진행하고 있다. 최근 들어서는 딥러닝을 비롯해 머신러닝 기법을 적용하는 형태의 연구가 많이 진행되는 추세다. 이 중 합성곱 신경망(CNN: Convolutional Neural Network), ResNet 등을 이용한 악성코드 분류 연구의 경우에는 기존의 분류 방법에 비해 정확도가 크게 향상된 것을 확인할 수 있다. 그러나 타깃 공격의 특징 중 하나는 사용된 악성코드가 불특정 다수를 상대로 광범위하게 퍼뜨리는 형태가 아닌, 특정 대상을 타깃으로 한 맞춤형 악성코드라는 점이다. 이러한 유형의 악성코드는 그 수가 많지 않기 때문에 기존에 연구되어온 머신러닝이나 딥러닝 기법을 적용하기에 한계가 있다. 본 논문은 타깃형 악성코드와 같이 샘플의 양이 부족한 상황에서 악성코드를 분류하는 방법에 대해 다루고 있다. 메모리가 추가된 신경망(MANN: Memory Augmented Neural Networks) 모델을 이용하였고 각 그룹별 20개의 소량 데이터로 구성되어 있는 악성코드 데이터셋에 대해 최대 97%까지 정확도로 분류할 수있음을 확인하였다. As the number of malicious code increases steeply, cyber attack victims targeting corporations, public institutions, financial institutions, hospitals are also increasing. Accordingly, academia and security industry are conducting various researches on malicious code detection. In recent years, there have been a lot of researches using machine learning techniques including deep learning. In the case of research using Convolutional Neural Network, ResNet, etc. for classification of malicious code, it can be confirmed that the performance improvement is higher than the existing classification method. However, one of the characteristics of the target attack is that it is custom malicious code that makes it operate only for a specific company, so it is not a form spreading widely to a large number of users. Since there are not many malicious codes of this kind, it is difficult to apply the previously studied machine learning or deep learning techniques. In this paper, we propose a method to classify malicious codes when the amount of samples is insufficient such as targeting type malicious code. As a result of the study, we confirmed that the accuracy of 97% can be achieved even with a small amount of data by applying the Memory Augmented Neural Networks model.
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비목나무 (Lindera erythrocarpa Makino) 껍질에서 분리한 신규화합물 (Jeju-Erythrane)의 멜라닌 생합성 억제 효과
강민철(Min-Chul Kang),고려경(Ryeo Kyeong Ko),김수경(Su-Gyeong Kim),최호민(Ho-Min Choi),진영준(Yeong-Jun Jin),한종헌(Jong-Heon Han),김봉석(Bong-Seok Kim),이남호(Nam Ho Lee),김기옥(Gi-Ok Kim) 한국생물공학회 2010 KSBB Journal Vol.25 No.4
본 연구는 제주도에서 자생하는 비목나무 (Lindera erythrocarpa) 껍질에서 분리 · 동정한 신규화합물 (Jeju-Erythrane)의 항산화 활성 및 B16F10 mouse melanoma 세포에서의 tyrosinase와 멜라닌 생합성의 억제효과를 확인하여, 유용자원으로서 미백 및 기능성 화장료로의 산업적 활용 가능성이 있는지 알아보고자 시행하였다. 실험 결과, 신규화합물인 Jeju-Erythrane의 항산화 활성은 확인되지 않았고, B16F10 세포에서 tyrosinase와 멜라닌 합성을 농도 의존적으로 억제하는 것으로 밝혀졌으며, tyrosinase와 TRP-1 유전자의 단백질 및 mRNA 발현양도 농도 의존적으로 감소함을 보였다. 하지만, TRP-2 단백질과 mRNA는 농도에 관계없이 일정하게 발현하는 것을 알 수 있었다. 따라서, 본 연구결과는 비목나무 (Lindera erythrocarpa) 껍질에서 분리 · 동정한 신규화합물 (Jeju-Erythrane)이 미백 관련 기능성 소재로서의 활용가치가 있음을 보여준다. In this study, a new compound, 1-(2-hydroxy-3,4,5,6-tetramethoxyphenyl)-1-methoxy-3-phenylpropane; (Jeju-Erythrane) was isolated and identified from the bark of Lindera erythrocarpa Makino. Also, we investigated the effects of Jeju-Erythrane on alpha melanocyte-stimulating hormone (MSH)-induced melanogenesis in mouse B16F10 melanoma cells. The new compound dose dependently inhibited the tyrosinase activity and melanin synthesis in B16F10 cells. The new compound showed inhibitory effect on the Tyrosinase and TRP-1 gene transcription but not on the TRP-2 gene. These results suggest that the new compound of L. erythrocarpa could be used as a functional biomaterial in developing skin whitening agent.
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강민철 ( Min Chul Kang ),박영도 ( Young Do Park ),이규석 ( Kyu Suk Lee ),정상립 ( Sang Lip Chung ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.8
Dematomyositis is an idiopathic inflammatory myopathy characterized by specific skin manifestations and progressive symmetric proximal muscle weakness. Importantly, dermatomyositis is occasionally associated with the internal malignant tumor, which is clearly correlated with poor prognosis. We report two cases of dermatomyositis, showing characteristic skin lesions, that associated with small cell lung cancer in a 64-year old man and gallbladder cancer in a 54-year old man, respectively. On laboratory findings muscle enzymes and liver function markers were elevated prominently. We tried to treat these patients with systemic corticosteroid and chemotherapy. The patient with small cell lung cancer died of SAH due to head trauma and in the case of the patient with gallbladder cancer, the symptoms of the muscle weakness and the skin lesions are getting better and worse repeatedly fluctuating and regular periodic follow up is required. (Korean J Dermatol 2008;46(8):1069~1074)
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강민철 ( Min Chul Kang ),김성애 ( Sung Ae Kim ),정상립 ( Sang Lip Chung ),이규석 ( Kyu Suk Lee ) 대한피부과학회 2009 대한피부과학회지 Vol.47 No.6
Silmazine(R) cream is an antibiotic agent widely used in burn therapy. It consists of Propylene glycol, Stearyl alcohol, Isopropyl Myristate, Sorbitan mono-oleate, Methyl-p-hydroxybenzoate, Polyoxyl 40 stearate and varseline. A 24-year- old female presented with well-demarcated erythematous papules and vesicles with an itching sensation on the dorsal area of her right hand. She had applied Silmazine(R) cream on the dorsal area of her right handfor 4 days and the skin lesion became aggravated. A patch test with Silmazine(R) cream `as is` showed a positive reaction and propylene glycol and stearyl alcohol, ingredients in Silmazine(R) cream, revealed a positive reaction. These two agents are known as weak sensitizers that can produce allergic contact dermatitis. There are some reports of allergic contact dermatitis from propylene glycol and stearyl alcohol used topically. As far as we know, there are no reports of allergic contact dermatitis from propylene glycol and stearyl alcohol in the Silmazine(R) cream (Silver sulfadiazine) that is commonly used as topical antibiotic medication for burns. We report this rare case of allergic contact dermatitis from propylene glycol and stearyl alcohol in Silmazine(R) cream (Silver sulfadiazine). (Korean J Dermatol 2009;47(6):710∼713)
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