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양극산화법에 의한 TiO<sub>2</sub> 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).
양극산화법에 의한 TiO<sub>2</sub> 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.
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.
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.