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RISS 인기검색어
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- 저자 : 오예성 ( Ye-sung Oh ) (검색결과 2 건)
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윤재혁(Jae-Hyuk Yoon),유승오(Seung-Oh Yoo),이동주(Dong-Ju Lee),예성혁(Sung-Hyuck Ye) 한국전자파학회 2018 한국전자파학회논문지 Vol.29 No.4
본 논문에서는 두 표적 간의 거리차를 정밀하게 계측할 수 있는 S-band 고 분해능 레이다 개발을 위한 시스템 기본 설계 및 구현 결과를 제시한다. 3.5 ㎓ LFM(Linear Frequency Modulation) 레이다 기본 설계를 위하여 제안하는 시스템 요구조건은 거리 분해능 1 m, 최대 계측 거리 2 ㎞이며 레이다 방정식을 통해 각 모듈의 사양을 결정하였다. 최종적으로 150 ㎒ 대역폭, 송신 출력 43 ㏈m 전력 증폭기, 이득 26 ㏈i 안테나, 잡음 지수 8 ㏈ 이하, RCS 1 ㎡일 때, 표적과 레이다의 최대거리 2 ㎞ 기준 SNR이 30 ㏈ 이상이 나올 수 있음을 확인할 수 있었다. 시뮬레이션 결과를 토대로 하드웨어 설계를 하였으며, SDR(Software Defined Radar) 장비를 이용한 LFM 레이다 설계 이론과 방법 그리고 야외 시험 결과를 보여주고 요구조건을 만족하는 레이다 시스템 설계가 가능함을 입증하였다. In this paper, we present the basic design results for high-resolution radar development at S-band frequency that can precisely measure the miss distance between two targets. The basic system requirement is proposed for the design of a 3.5 ㎓ linear frequency-modulated (LFM) radar with maximum detection distance and distance resolution of 2 ㎞ and 1 m, respectively, and the specifications of each module are determined using the radar equation. Our calculations revealed a signal-to-noise ratio ≥ 30 ㏈ with a bandwidth of 150 ㎒, transmission power of 43 ㏈m for the power amplifier, gain of 26 ㏈i for the antenna, noise figure of 8 ㏈, and radar cross-section of 1 ㎡ at a target distance of 2 ㎞ from the radar. Based on the calculation results and the theory and method of LFM radar design, the hardware was designed using software defined radar technology. The results of the subsequent field test are presented that prove that the designed radar system satisfies the requirements.
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혈액투석 환자에서 당뇨병 유무에 따른 영양상태와 영양섭취량 비교
오예성 ( Ye-sung Oh ),안재영 ( Jae-young Ann ),김미향 ( Mi-hyang Kim ),최선정 ( Sun-jung Choe ),정종철 ( Jong Cheol Jeong ) 대한영양사협회 2017 대한영양사협회 학술지 Vol.23 No.1
It is well known that malnutrition is a predictor of mortality in hemodialysis patients. The number of diabetic nephropathy patients is increasing rapidly. This study aimed to investigate nutritional status and nutrient intake according to the presence of diabetes among hemodialysis patients. The nutritional intake and general characteristics of outpatients at Ajou University Hospital (24 with diabetes and 30 without diabetes) were investigated between July and September 2015. Patients` general data were collected, and nutritional status by Patient-Generated Subjective Global Assessment (PG-SGA) was evaluated. Nutrient intakes were assessed according to 3-day food records. There was no significant difference regarding body weight between the two groups. However, the non-diabetic group showed a better nutritional status by Patient-Generated Subjective Global Assessment (PG-SGA) (5.2±4.4 vs. 8.0±4.3 score, non-diabetics vs. diabetics, P<0.05). There was no difference in daily calorie intake (1,473.9±370.5 vs. 1,503.8±397.5 kcal) and protein intake (60.3±19.7 vs. 65.6±20.5 g) in those with diabetes. Intakes of vegetables protein, sodium, potassium, vitamin C, folic acid and fiber were significantly higher in the diabetic group compared to those of the non-diabetic group. There was no difference in daily nutrient intake between the hemodialysis weekday and weekend groups. The non-diabetic group had higher calorie and sodium intakes per meal in the hemodialysis weekday group, but the difference was not significant. Based on these results, intervention should be performed to improve nutritional status in consideration of diabetes and dietary patterns.
ScienceON
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