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주파수 가변 고속 디지털 MRI 모뎀 RF부 설계와 구현
김용철,박현대,김대진 전남대학교 전자통신기술연구소 2001 전자통신기술논문지 Vol.4 No.1
In this paper, we designed and made RF block of variable frequency digital modem for high speed MIRI system that can support not only multi-nuclei system but also any magnetic intensity(1.0T~3.0T). We executed simulation of fixed frequency digital modem using fixed band pass filter(BPF), variable frequency digital modem using variable band pass filter(tunable filter). Based on these simulations, variable band pass filter(tunable filter) named Micropole is ordered and manufactured. We designed and made RF block of variable frequency digital modem for high speed MRI system using variable band pass filter(tunable filter). And then we tested this board using PC and function generator and observed the output spectrum using spectrum analyzer. These spectrums are very clear and wide bandwidth about 500KHz and the level of main spectrum is 60~70dB more than harmonics or spurious. This difference of level is available for MRI system.
히시다 슌소(菱田春草)의 <염화미소(拈華微笑)>에 관한 시론
김용철 미술사와 시각문화학회 2005 미술사와 시각문화 Vol.4 No.-
The present article aims to examine the functions in which vessels made respectively of white porcelain, gold, silver and copper were employed at the joseon(1392-1910) royal court from the early 15th century throughout the 16th centuries, It also traces the values of those types of vessels during the time frame. This study eventually attempts to explore and highlight the evolution of the materials with which vessels, employed in specific functions, were made, and the shift of values assigned to them in the East Asian traditional society, Ceramic wares were often replaceable with vessels made using other types of materials, in particular, those made of metal including gold, silver and copper, The consumption of these met-als could often be closely related to larger economy and politics of a state. It is known tbat from the reign of King Sejong (r. 1418-1450), after the exemption of the annuaJ tribute of gold and silver to Ming imperial court, white porcelain wares began to replace gold and silver vessels for use in important functions at the royal court, The replacement was made in order to save on gold and silver, and to avoid exposing the use of them to Chinese envoys, which might provoke a claim for the re-institution of the annual tribute, It is generally believed that from that point onwards, white porcelain wares emerged as the utmost important type of royal court wares throughout the Joseon dynasty. Yet, scholarly attention has hardly been paid to the types of materials employed in the similar functions in later periods, probably under the premise that the situation continued. Thepaper shows, however, how gold, silver and copper vessels again replaced a large percentage of wnite porcelain wares of important functions inside me royal house, and how me use and value of these types of vessels began to rapidly shift particularly from sometime during the first half of me 16m centuries. The paper further examines the relationship between this shift and certain political, diplomatic and ideological elements, as well as eco-nomic conditions of me society. The study finally highlights the parallels between the shift, and the evolution of techniques and styles of white porcelain wares during the 15th and 16m centuries.
Street Art(거리미술)에 나타난 표현기법에 관한 연구 - 도시벽화를 중심으로 -
김용철,남용현 한국일러스트레이션학회 2007 일러스트레이션 포럼 Vol.14 No.-
도시벽화는 1960년대 후반 미국에서 시작된 <도시벽화운동>이후 개념적 정립이 시작되었다. 사회의식과 저항의식을 지니고 특정작가에 의해서만 제작된 초기의 도시벽화는 점차 특정작가가 아닌 대중에 의해 창조되는 대중의 문화로서 자리 잡아갔고 이러한 대중문화로서의 긍정적인 측면은 현대에 와서 재해석되고 있다. 특히 도시미화에 대한 관심이 높아짐에 따라 정책적으로 도시벽화를 활용한 도시미화를 시도하는 등의 움직임이 나타나고 있다. 즉, 타인의 소유물 및 공공시설물에 행해지는 낙서로서의 부정적인 의미를 지니고 있음에도 불구하고 도시미화라는 긍정적인 측면 때문에 특정지역이나 행사에서 중요한 역할을 수행하고 있다. 다른 미술 및 디자인분야와 마찬가지로 도시벽화도 컴퓨터와 인터넷으로 대표되는 21세기에 접어들면서 그 표현방법과 기법이 다양해지고 다변화되었다. 디지털 미디어”Digital Media"가 접목되면서 더욱 다양해진 표현기법과 용도에 따른 분류를 통해 다소 생소한 느낌의 “Street Art"와 도시벽화의 개념을 고찰하고 여기에 나타난 이미지의 표현기법을 고찰하고자 한다. The concept of the city mural painting has set up after <the city mural painting movement> which began in late 1960 America. The early city mural painting was made by the specific artists who had a resistant consciousness with the society, and gradually it has been established as a popular culture which created by the populace not the specific artists. Today, positive side as a popular culture has been revaluated. Especially, a concern of the city-beautiful gets higher, the city mural painting has been used in political way. Nevertheless the city mural painting bears negative meaning which is scribbled at public property, it is accomplishing important role in specific region or events due to positive side as a city-beautiful. When computer and internet represent 21st century, an expression method and technique of the city mural painting came to be various like the art and design field. This study makes an investigation about "Street Art" including the city mural painting from more various expression techniquesto the influence of Digital Media and the classification according to the purpose. Moreover it tries to find out about the expression technique of the image.
일본미술사 연구에 나타난 동아시아적 관점에 대한 검토 : 일본 내회화사 연구를 중심으로
김용철 미술사와 시각문화학회 2003 미술사와 시각문화 Vol.2 No.-
In recent years one of the remarkable [fend in the study of Japanese an history in Japan is related with the view of the East Asia. It rakes the serious view of the sphere of East Asia in relation to development of Japanese an history, and it means the overcome of the view of ethno-centurism which was established in modem Japan mainly during formative period of nation state. Some themes like Muromachi ink painting, literati painting (nan-ga), buddhist paining etc. are concerned with this view. There are several types of this trend, for example to study an universal feature with the diffusive view in the painting of this area, deconstructionist. Feminist. It has certainly affirmative aspect, but it needs to keep look out for, too.