양극산화법에 의한 TiO₂ 나노튜브 어레이의 제조와 성장거동

김선민,김기원,류광선,김유영,조권구,Kim, Seon-Min,Kim, Ki-Won,Ryu, Kwang-Sun,Kim, Yoo-Young,Cho, Kwon-Koo 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.1

Recently, $TiO_2$ nanotubes have considerably researched because of their novel application about photocatalysis, dye-sensitized solar cells (DSSCs), lithium ion battery, etc. In this work, self-standing $TiO_2$ nanotube arrays were fabricated by anodic oxidation method using pure Ti foil as a working electrode in ethylene glycole with 0.3M $NH_4F$ + $2%H_2O$. Growth behavior of $TiO_2$ nanotube arrays was compared according to temperature, voltage and time. The morphology, structure and crystalline of anodized $TiO_2$ nanotube arrays were observed by FE-SEM (field emission scanning electron microscope) and XRD (X-ray diffraction).

우리나리 보건복지 사업의 전망과 과제

김선민,Kim, Seon-Min 한국가톨릭의료협회 2002 한국가톨릭병원협회지 Vol.32 No.-

유체공학 일반 분야 연구동향

김선민,Kim, Seon-Min 한국유체기계학회 2011 한국유체기계학회 논문집 Vol.19 No.6

오픈신경망 포맷을 이용한 기계학습 모델 변환 및 추론

김선민,한병현,허준영,Kim, Seon-Min,Han, Byunghyun,Heo, Junyeong 한국인터넷방송통신학회 2021 한국인터넷방송통신학회 논문지 Vol.21 No.3

최근 다양한 분야에 인공지능 기술이 도입되고, 학계 관심이 늘어남에 따라 다양한 기계학습 모델들이 여러 프레임워크에서 운용되고 있다. 하지만 이러한 프레임워크들은 서로 다른 데이터 포맷을 가지고 있어, 상호운용성이 부족하며 이를 극복하기 위해 오픈 신경망 교환 포맷인 ONNX가 제안되었다. 본 논문에서는 여러 기계학습 모델을 ONNX로 변환하는 방법을 설명하고, 통합된 ONNX 포맷에서 기계학습 기법을 판별할 수 있는 알고리즘 및 추론 시스템을 제안한다. 또한, ONNX 변환 전·후 모델의 추론 성능을 비교하여 ONNX 변환 간 학습 결과의 손실이나 성능 저하가 없음을 보인다. Recently artificial intelligence technology has been introduced in various fields and various machine learning models have been operated in various frameworks as academic interest has increased. However, these frameworks have different data formats, which lack interoperability, and to overcome this, the open neural network exchange format, ONNX, has been proposed. In this paper we describe how to transform multiple machine learning models to ONNX, and propose algorithms and inference systems that can determine machine learning techniques in an integrated ONNX format. Furthermore we compare the inference results of the models before and after the ONNX transformation, showing that there is no loss or performance degradation of the learning results between the ONNX transformation.

양극산화법에 의한 TiO₂ 나노튜브 어레이의 제조 및 광전기화학적 특성에 관한 연구

김선민,조권구,최영진,김기원,류광선,Kim, Seon-Min,Cho, Kwon-Koo,Choe, Yeong-Jin,Kim, Ki-Won,Ryu, Kwang-Sun 한국분말야금학회 2010 한국분말재료학회지 (KPMI) Vol.17 No.3

Self-standing $TiO_2$ nanotube arrays were fabricated by potentiostatic anodic oxidation method using pure Ti foil as a working electrode and ethylene glycol solution as electrolytes with small addition of $NH_4F$ and $H_2O$. The influences of anodization temperature and time on the morphology and formation of $TiO_2$ nanotube arrays were investigated. The fabricated $TiO_2$ nanotube arrays were applied as a photoelectrode to dye-sensitized solar cells. Regardless of anodizing temperature and time, the average diameter and wall thickness of $TiO_2$ nanotube show a similar value, whereas the thickness show a different trend with reaction temperature. The thickness of $TiO_2$ nanotube arrays anodized at $20^{\circ}C$ and $30^{\circ}C$ was time-dependent, but on the other hand its at $10^{\circ}C$ are independent of anodization time. The conversion efficiency is low, which is due to a morphology breaking of the $TiO_2$ nanotube arrays in manufacturing process of photoelectrode.

산업장 독성물질에 의한 신장질환

김선민,Kim, Seon-Min 대한산업보건협회 1991 산업보건 Vol.39 No.-

인공지능을 활용한 스트리밍 서비스/SNS 내에서의 폭력 감지 시스템

김선민 ( Seon-min Kim ),이석원 ( Seok-won Lee ),임승수 ( Seung-su Lim ),최상일 ( Sangil Choi ) 한국정보처리학회 2020 한국정보처리학회 학술대회논문집 Vol.27 No.1

인터넷 및 IT 기술의 발전과 더불어 미디어산업에도 큰 변화가 일어나고 있다. TV 를 대신하여 스트리밍 서비스를 이용하는 사람들이 늘고 있으며 SNS 를 활용하여 서로의 경험을 간접적으로 공유하는 형태의 새로운 문화 컨텐츠가 자리잡아가고 있다. 하지만 이러한 컨텐츠를 소비하는 주요 계층 중에는 초중고 학생들도 포함되어 있다. 인터넷 혹은 SNS 에서 소비되는 컨텐츠들을 관리 감독하는 컨트롤 타워가 부족하거나 전무하기 때문에 폭력, 음주, 흡연 등 사회적으로 악영향을 줄 수 있는 영상 또는 사진이 무분별하게 생산되어 청소년들에 의해 소비되고 있으며 더 나아가 이것이 사회적 문제로까지 대두되고 있다. 이러한 문제를 해결하기 위해 인공지능 기술을 활용한 여러 다양한 감시 시스템 개발을 위한 연구가 한창이다. 본 연구에서는 SNS 및 스트리밍 서비스에서 제공 되는 영상 및 사진을 Pose Estimation 및 표정 인식 기술을 활용하여 폭력을 자동적으로 감지할 수 있는 폭력 감지 시스템을 개발하는데 그 목적이 있다.

복수의 감별에 있어 혈청과 복수내 CEA 및 CA19-9의 가치에 관한 연구

김선민 ( Kim Seon Min ),박경식 ( Park Gyeong Sig ),마상인 ( Ma Sang In ),김휘정 ( Kim Hwi Jeong ),유승박 ( Yu Seung Bag ),조준환 ( Jo Jun Hwan ),이재동 ( Lee Jae Dong ),이중건 ( Lee Jung Geon ) 대한내과학회 1992 대한내과학회지 Vol.42 No.4

1989년 4월 1990년 12월까지 본원 내과에서 입원하였던 복수 환자 81예를 대상을 그 원인 악성 질환에 의한 것인지 양성 질환에 의한 것인지를 감별하기 위해 혈청 및 복수내의 CEA, CA19-9의 농도를 측정 비교하여 그 임상적 의의에 대해 다음과 같은 결과를 얻었다. 1) 악성 질환에서의 CEA의 혈청내 평균치는 양성질환보다 의의있는 상승을 보였으며(p<0.05), 복수내 평균치 또한 유의한 상승을 보였다(p<0.01)> 2) CA19-9의 혈청과 복수에서의 평균치는 악성 복수군에서 현저한 상승을 보였으나 통계적 유의성은 없었다.(p>0.05). 3) 복수의 감별진다에 있어 CEA의 복수내의 민감도는 84%였으며 혈청에서는 71%이였으며 CA19-9는 복수내의 민감도가 68% 혈청에서는 60%로 CEA보다는 전체적으로 민감도가 낮았다. 4) 혈청과 복수에서 CEA 병합 검사시 민감도는 86%로 상승하였으며 CA19-9병합 검사시 민감도 또한 73%로 상승 하였으며 모두 병합 검사시 민감도는 92%로 의의있는 상승을 보였다. 5) 혈청내 CEA 복수내 CEA 혈청내 CA19-9 및 복수내 CA19-9 검사간에는 유의한 상관관계가 있었다(p<0.005, p<0.001). 이상과 같이 혈청과 복수에서의 CEA와 CA19-9 농도 측정은 복수의 원인이 악성 질환에 의한 것인지를 아는데 도움이 될 것으로 사료된다. Ascites may be caused by various benign and malignant disease, but it is sometimes difficult to determine whether it is caused by benign disease or malignant diseases. In order to determine whether CEA, CA 19-9 in ascitic fluid and serum assist in the diagnosis of malignant disease that causing ascites, we studied 38 cases of malignant ascites and 43 cases of benign ascites patients who were admitted to Seoul Adventist Hospital from April 1989 to December 1990. The results were obtained as follows: 1) The mean value of CEA in serum and ascitic fluid of the malignant ascites group were significantly higher than that of the benign ascites group in serum (p<0.05), in ascites (p<0.01). 2) The mean value of CA 19-9 in serum and ascitic fluid of the malignant ascites group was signficantly higher than that of the benign ascites group was significantly higher than that of the benign ascites group, there was no significance in statistical aspects(p>0.05). 3) The sensitivity of CEA was 81% in ascites, 78% in serum, the sensitivity of CA 19-9 was 63% in ascites, 65% in serum. 4) The sensitivity of CEA was increased to 87% in serum and ascites combinations, the sensitivity of CA 19-9 was also increased to 81% in serum and ascites combinations. The sensitivity was significantly elevated to 92% in case of all tumor marker combinations. 5) There was a significant correlations between serum CEA and ascites CEA, serum CA 19-9 and ascites CA 19-9. (p<0.01, in all cases) It was concluded that the measurement of serum and ascites CEA, CA 19-9 levels is useful lin differention between ascites caused by benign and malignant diseases. Combinantions of each tumor markers in serum and ascites were more accurate than single test.

[중국 근세Ⅱ] 전통적인 ‘명청사’ 연구의 축적과 새로운 ‘청사’ 연구의 모색

김선민(Kim, Seon-Min) 역사학회 2014 역사학보 Vol.0 No.223

Korean scholarship in Ming-Qing history over the past two years has witnessed a range of issues and topics discussed, including various dimensions of local societies in China proper growth in commercial economy throughout the empire, cultural and material exchanges between Beijing and Seoul, etc. Most notably, several publications of monographs on the topics of social structure, economic development, and environmental changes in the Ming-Qing periods are a major achievement in this field which demonstrates the high status of Korean scholarship in Ming-Qing studies. In addition to this rich and long tradition on socio-economic approaches, the past two years of Ming-Qing studies observed a steady increase in research on topics relevant to Manchu distinctiveness and the Inner Asian tradition, one of the many subjects that differentiated the rule of the Ming from that of the Qing. It is important to note here that this recent trend in Manchu distinctiveness and the Qing Empire would not have emerged without the rich tradition of pursuing socio-economic approaches in Korean academia of Ming-Qing history. Understanding of the significant roles of non-Han people in Qing history cannot be reached unless the economic and cultural aspects of Han Chinese society are fully assessed and explained. Therefore, a variety of research on China Proper and frontier regions, Han Chinese society and the world of non-Han people, Chinese materials and Manchu documents, are all equally necessary and important for our balanced understanding of Ming-Qing history.

당대의 중앙-지방 통신체계와 동어부

김선민 ( Kim Seon Min ) 중국사학회 2003 中國史硏究 Vol.25 No.-

In ancient China that the technology of communication were not like today, central government had to dispatch an envoy to give orders or directions to local organizations. But someone who had intention of rebellion against the government could represent himself as an official envoy and the letters which he took might be a forgery. too. Moreover, if the forgery letters were about military affairs, that could cause serious problems. Thus the administrators made an institutional device the so-called Copper Tiger Tally(銅??符) or Copper Fish Tally(銅魚符) system.The tally was made up of copper, which was divided into two pieces, right and left one. It was shaped like a fish in T`ang dynasty, but a tiger in more early times. The right was given to local governors and military commanders. the left being kept in administrative office of central government. For example, when the central government would give an order local military commanders to move their troops, the authority ought to issue an left tally, which was sealed throughly. The envoy took the left tally with an official notes and started for his destination. When the envoy arrived at there, the military commander brought his own right tally which he took over on the day of proceeding to his new post. Then he joined the right and left together. Only in the case the two things fitted tightly together the commander read the official notes and carried out the orders or directions written in it. After that procedures. the left tally had to be returned to the central administrative office where it was. The communication between central government and local governors or military commanders was proceeded in this way. In ancient times. this system was the best way to secure the exact and secret delivery of official letters.