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.

Now & Then 일상 : 기차는 추억을 싣고 _ 김용철

김용철,박준 (주)월간사진 2020 월간 사진 Vol.631 No.-

일제시대 충청지역기업의 생성과 발전에 관한 연구

김용철 한국동서경제학회 1994 한국동서경제연구 Vol.5 No.-

운동형태에 따른 중년여성의 신체구성과 혈중지질의 변화

김용철,김영수,양정옥,이범진,이중숙,Kim, Yong Cheol,Kim, Young Soo,Yang, Jeong Ok,Lee, Bom Jin,Lee, Joong Sook 한국데이터정보과학회 2013 한국데이터정보과학회지 Vol.24 No.6

The purpose of this study was to investigate and compare the effects of aerobic and complex exercise on body composition and blood lipids in the middle-aged women. Sixteen women whose ages ranged in 40 to 50 years were included in the sample of the study. The sample was divided into two groups: (a) aerobic exercise group (n = 8) and (b) combined exercise training group (n = 8). The aerobic exercise program consisted of bicycle ergometer, stepper, and treadmill, whereas; the combined exercise program was designed to improve muscular strength and aerobic capacity. Both programs took place 4 times a week for 12 weeks with the gradual increase of intensity (HRmax 60% 75% and 1 RM 60% 80%). Data were analyzed by nonparametric methods for pre-post within group mean differences (Wilcoxon signed rank test) and for between group mean differences (Wilcoxon rank sum test). Results indicated that there were statistically significant differences in BMI, body fat mass, and triglyceride within the sample of combined exercise; whereas, no significance existed in any variables within the aerobic exercise group. Results also revealed that statistical significance did exist in body fat mass between the combined and aerobic exercise group. These results implies that the combined exercise may be superior to aerobic only excercise for the body composition and blood lipid of the middle-aged women. 이 논문의 연구목적은 운동형태에 따라 중년여성의 신체구성과 혈중지질에 미치는 영향을 규명하기 위한 것이다. 연구대상은 40 50대 중년여성으로 유산소운동집단 8명, 복합트레이닝집단 8명 두 그룹으로 나누었으며, 12주간의 운동프로그램을 실시하였다. 운동강도는 주4회, 1회 70~90분, HRmax 60%~75%, 1RM 60%~80%로 점진적으로 증가시켰다. 자료처리는 Windows 용 SPSS ver. 21.0 통계 프로그램을 사용하여 평균과 표준편차 등을 산출하고, 비모수통계분석 방법인 윌콕슨 부호순위검정과 윌콕슨 순위합검정을 통해 그룹별 사전-사후 평균차와 변화량에 대한 그룹간 차이를 검정하였다. 연구결과를 살펴보면, 먼저 각 집단별 사전-사후 평균차에서는 복합운동 집단의 BMI, 체지방량, 그리고 중성지방에서만 통계적으로 유의한 차이가 나타났다. 또한 변인별 사전-사후 변화량에 대한 두 집단간의 차이 검정에서는 체지방량에서만 통계적으로 유의한 차이가 나타났다. 부가적으로 통계적 유의성은 검증되지 않았지만 각 별인별 사전-사후 평균 변화에 대한 기술통계를 살펴보면 복합운동이 유산소운동에 비해 상대적으로 더 효과적일 수 있다는 것을 알 수 있다.

근대 일본인의 고구려 고분벽화 조사 및 모사, 그리고 활용

김용철 한국미술사학회 2007 美術史學硏究 Vol.254 No.254

Scholarly Research, Copying, and Application of Goguryeo Tomb Murals in Modern JapanKim Yongcheol *This paper examines the Japanese discovery of mural paintings in Goguryeo tombs during thecolonial rule in Korea and how this spurred the Taste for Goguryeoin modern Japanese artModern studies of Goguryeo tomb murals were initiated by Japanese scholars during theJapanese colonial rule in the Korean peninsular1910 1945 As a resultcolonialist notions ofKorean historywhich was subordinate to the history of Chinaprevailed in the studies of thesetomb murals as wellThus the murals were not regarded as examples of a unique Goguryeo art

도농통합의 실천적 연구 -대전,금산을 사례로-

김용철 한국토지행정학회 2001 論文集 Vol.8 No.-

신도시개발 정책과정에서 공공관료의 이익추구 행태 분석 -신도시개발 예산집행 체계를 중심으로-

김용철 한독사회과학회 2003 한독사회과학논총 Vol.13 No.2

Bureaucrats' role is very important in the process of policy implementation in link with budget and manpower, organization. In the case of this dissertation, bureaucrats' profit seeking maximization was revealed in the first step of policy implementation of this new town region. In this case, policy initiator was Korea Land Corporation. Korea Land Corporation enlarged the role that intervene the land market system using their legal power affiliated with the nation budget.The most important factor of this analysis is internality effect of bureaucratic system. Bureaucratic systems include profit maximization of their budget, organization and so on. Korea Land corporation has very big role in the process of the land policy and housing problem in Korea. In this case, the main issue is the distortion of the financial resources affiliated with public corporation.Financial resources have not been distribute equally between low and high level classes, in this case, because of internality effect of Korea Land Corporation. Financial resources should be distributed equally between low and high level classes in the process of policy implementation using the public relations.

초산부와 경산부에서 경막외마취하 제왕절개술시 술중 및 술후의 통증과 부작용

김용철 대한마취과학회 1995 Korean Journal of Anesthesiology Vol.28 No.3

The differences of pain and complications to epidural anesthesia according to parity during cesarean section and postoperative period are obscure so far. In this study, I investigated the possibility of those differences in sixty patients: 29 primipara and 31 multipara. Epidural anesthesia was established with a local anesthetic mixture of 2% lidocaine 10 ml, 0.5% bupivacaine 20 ml, and epinephrine 1:200,000 by fractionated dose to anesthetize the patient up to T-4 sensory dermatome. All the patients were received either saline 10 ml or fentanyl 100 μg/10 ml immediately after delivery and 3.5 mg/6 ml of morphine just after peritoneal closure via epidural route. This study revealed that there was no difference in those intraoperative and postoperative responses between primipara and multipara.

Diurnal variation of flow-mediated dilatation in healthy humans

김용철,윤경호,우선호,정영훈,임재홍,황교범,정진우,이미림,이정미,이상재,김남호,오석규,정진원 대한고혈압학회 2015 Clinical Hypertension Vol.21 No.5

Introduction: The measurement of flow-mediated dilatation (FMD) via ultrasound has been established as a reliable non-invasive measurement of endothelial function. However, the guidelines mention nothing regarding diurnal variation of FMD. Thus, we investigated the FMD in healthy people and diurnal variation of FMD. Methods: Twenty-five apparently healthy persons participated in this study. All participants had no history of cardiovascular diseases, hypertension, or diabetes and used any medication. For each volunteer, the measurements were repeated in the morning and afternoon on two different days. We checked capillary blood glucose, total cholesterol, triglyceride, high-density lipoprotein (HDL), and low-density lipoprotein (LDL)-cholesterol. Results: The average of FMD measurements was 8.45% ± 2.39%. The mean values of systolic and diastolic blood pressure, heart rate, lipid profiles, and glucose levels were similar between the morning and afternoon measurements after 9-h fasting. There was no significant difference of FMD measurements between the morning and afternoon (8.32% ± 2.27% and 8.58% ± 2.56%, p = 0.329). Moreover, there was significant correlation between FMD in the morning and afternoon (r = 0.856, p < 0.001). Conclusions: Our study shows measurement of FMD was 8.45% in healthy Koreans. Also, there was no significant difference of FMD measurements between the morning and afternoon.

최연소판사로 법이론에 밝은 실력파

김용철 한국사법행정학회 1975 사법행정 Vol.16 No.11