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.

러일전쟁기 일본 전쟁화의 몇 가지 유형

김용철 단국대학교 일본연구소 2010 일본학연구 Vol.29 No.-

War Painting of Japan during the Russo-Japanese War are divided into two groups which are depicted the scene of front, and the scene of the rear. The first group is consisted of paintings by painters followed the army and paintings by only imagination. In the first time of the war there were almost war paintings of imagination, the works became printed in the magazine,『Records of Russo-Japanese War日露戦争実記(Nichiro-senso-jikki)or 『New Report of Fine Art美術新報(Bijutsu-sinpo) as the activity by the painters followed the army were increased. Almost of the war paintings which were painted during the Russo-Japanese War were based on the nationalism of Japan and ideology of the Emperor system. In their paintings patriotism were impressed and the war dead were painted as heros and they never expressed the character of the war as invasion war. There were really rare cases reflected the humanism by painting the surviving family such as Isii Hakutei石井柏亭 and Kobayashi Senko小林千古 and painting the war with sceptic view like Kosugi Misei小杉未醒.

딥러닝 기반 터널 라이닝 균열 탐지를 위한 라인 스캐닝 자료 및 외관망도 활용방안

함상우(Ham, Sangwoo),배수현(Bae, Soohyeon),이임평(Lee, Impyeong),정동기(Chung, Dongki) 대한토목학회 2022 대한토목학회 학술대회 Vol.2022 No.10

최연소판사로 법이론에 밝은 실력파

김용철 한국사법행정학회 1975 사법행정 Vol.16 No.11

참조기어업

김용철,Kim, Yong-Cheol 선박안전기술공단 1981 漁船 Vol.7 No.-

건축기술부분을 퇴출시켜 건축설계사가 되어야 하나

김용철,Kim, Yong-Cheol 대한건축사협회 2000 建築士 Vol.2000 No.2

해저지형 측량성과를 이용한 지구물리자료 비교분석

김용철,최윤수,박병문 대한공간정보학회 2009 Spatial Information Research Vol.17 No.1

The information of ocean topology is the fundamental source which is necessary for understanding the ocean, producing nautical charts and delimiting maritime boundaries. An echo sounder is being used generally to collect undersea bathymetric data, but an indirect method such as geophysical data acquired by satellites is being used recently. In this study, the outputs of ocean surveying for the production of the Basic Maps of the Sea in 1996 and 1997 in the East Sea and the bathymetric data produced by geophysical data are compared and analyzed. The study areas are Ulleung Plateau, Ulleung Basin and the southern area of Ulleung Basin which have different geophysical characteristics. Through this study, we found that the bathymetric data acquired by an indirect method using satellite is similar to the field surveying results in general configuration of ocean floor and average depth. However, the minimum square error is about 100m in 1700m depth, and it has been observed a local error up to 1000m. In addition, it has been found that the detailed undulation of ocean topology is shown on the gravity data which is acquired by the research vessel. 해저지형 정보는 바다를 이해하기 위한 기본항목이며, 항해용 해도를 제작하고 해양경계를 획정하는데 기초자료로 활용된다. 해저지형 정보를 얻기 위해서는 음향측심기를 이용하는 것이 일반적이지만 최근에는 인공위성에서 얻은 지구물리자료를 이용하여 간접적인 방법을 이용하기도 한다. 본 연구에서는 1996년과 1997년에 실시한 실측 측량성과와 인공위성 자료를 이용한 지구물리자료와 비교분석을 실시하였다. 연구대상 해역은 해저지형의 특성이 다른 울릉대지, 울릉분지, 울릉분지남부해역으로 선정하였다. 비교분석에는 실측성과를 비롯하여 Topex/Poseidon, Etopo2, JODC, BODC 자료를 이용하였다. 인공위성을 이용하여 간접적인 방법으로 산출된 해저지형 자료는 실측성과를 기준으로 할 때 전반적인 해저지형 형태와 평균수심의 값은 대체적으로 잘 맞았으나 RMS는 수심 1700m 깊이에서 100m 정도로 나타났다. 또한 국지적으로 오차가 1,000m에 이르는 경우도 발견되었으며, 선상에서 얻은 중력관측 성과에서도 해저지형의 형태가 부분적으로 자세히 나타나는 경향을 찾아냈다.

연구논문 - 유지 , 계면활성제분과 / 정밀화학분과 : 두 개의 술폰산염기를 함유한 제미니 계면활성제의 합성 및 계면성

김용철,최성욱,남기대 ( Yong Cheol Kim,Sung Ok Choi,Ki Dae Nam ) 한국공업화학회 1997 한국공업화학회 연구논문 초록집 Vol.1990 No.3

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.

토양수분 차이가 대두 근류균의 질소고정에 미치는 영향

김용철,최인수 한국생명과학회 2002 생명과학회지 Vol.12 No.5

대두의 질소고정 근류균들 중 우리나라 토착균, USDA110, USDA122, RJl-29, R2l4 등으로 종자분의접종한 삼남콩을 폿트에 재배하여 개화기에 한발처리한 것과 관행으로 폿트에 재배한 것과의 근류균별 질소고정력 조사와 콩의 제요인에 미치는 근류균의 영향, 한발조건시 근류균 질소고정력과 협중과의 상관관계, 식물체 호흡량과 엽면적과의 상관관계 등을 시험한 결과를 요약하면 다음과 같다. 관행재배에서는 근류균의 질소고정력이 R2l4와 토착균이 높게 나타났으나, 개화기에 한발처리를 한 구에서는 토착근류균 보다 R2l4와 Rll-29의 균들이 질소고정력을 높게 나타내었다. 토착근류균에 비하여 USDA122와 RJl-29의 근류균을 접종한 구가 한발조건에서 식물체 호흡량을 적게 유지하여 엽면적 및 협중의 상대지수를 높게 나타내었다. 한발조건에서 근류균 질소고정력과 협중 상대지수와의 상관관계는 r=0.85'로서 유의적인 정의 상관관계를 나타내었다. 한발조건에서 식물체 호흡량과 엽면적 상대지수와의 상관관계는 r=-0.89'로서 유의적인 부의 상관관계를 나타내었다. The object of this study was to investigate nitrogen fixation activity of rhizobium inoculated at seed coat when drought condition was applied in flowering period of soybean c.v. Samnamkong. The rhizobia used in this experiment were indigenous rhizobium, R2l4, RJl-29, USDA110 and USDA122. The experiment was done with 1/2000 Wagner pots in laboratory and greenhouse and was tested in completely randomized design with four replications. Nitrogen fixation activity in coventional culture was the highest in R2l4 and indigenous rhizobium among the five rhizobia strains. As given drought condition from flowering to maturity, nitrogen fixation activity was higher in R2l4 and RJl-29 than indigenous rhizobium. Leaf area and relative index (drought/convention) of pod weight were higher in USDA122, RJl-29 and R2l4 than indigenous rhizobium as given drought condition from flowering to maturity. High positive correlation was observed between nitrogen fixation activity of rhizobium and relative index(drought/convention) of pod weight. High negative correlation was observed between respiration of plant and relative index (drought/convention) of leaf area.