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김현옥(H. O. Kim),이홍우(H. W. Lee),조진래(J. R. Cho),이진규(J. K. Lee),장문석(M. S. Jang) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.10
In the process of HSU design, decision of kinematic dimension is important part. At first, we put in order kinematic relationship of HSU and so show coherent course in the kinematic design. And by using of decided dimension data, we analyze kinematic motion and investigate dynamic characteristics of moving part of HSU systems.
Wi-Fi Backscatter Systems for IoT Sensors with Enhanced Communication Reliability
김찬규(Chankyu Kim),백성민(Seongmin Baek),이성주(Seongjoo Lee) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.8
IoT 기술이 발전함에 따라 배터리 문제가 대두되었다. 미국의 워싱턴 대학에서 저전력으로 Tag를 동작시키는 Wi-Fi 백스케터 기술을 처음 제시하였다. 그러나 이 방식은 전송 성능 및 전송률이 낮다는 단점이 있었다. 이를 개선하기 위해 Tag에서 에너지를 조절하는 M-레벨 변조 방식을 통해 전송률을 높이는 방법이 제시되었다. 그러나 M-레벨 변조 방식은 낮은 SNR환경에서 신뢰성이 떨어지는 문제점이 있었다. 본 논문에서는 딥러닝 기반의 수신기를 구성함으로써 낮은 SNR 환경에서도 Wi-Fi backscatter 시스템의 성능을 높일 수 있도록 하였다. 또한, Tag의 구성을 그대로 적용하기 때문에 전송률뿐 아니라 Tag에서 배터리가 필요하지 않으며, 사용되는 에너지가 적다는 장점도 있다. 제안하는 딥러닝 방식은 2-level일 때 22dB SNR 환경에서 10-3 BER 성능을 확인하였다.
國民學校 兒童의 蛋白食餌 攝取 評價에 關한 硏究 : 尿中 尿素 室素와 尿中 Creatinine 比에 依한 As an Indicator of Protein Intake
金鉉玉 서울大學校 保建大學院 1973 公衆保健雜誌 Vol.10 No.1
Protein malnutrition of children is one of the most serious nutritional deficiencies in developing countries. Urea nitrogen excretion in ureotelic animals is most sensitive to dietary protein. The 24 hours excretion of creatinine in the urine of a given subject is remarkably constant from day to day. The creatinine excretion of different individuals of same age and sex is also quite constant. Low ratios of urinary urea to creatinine are found among children low protein intake. The foregiving world-wide investigations indicate that the urea nitrogen/creatinine ratios seems to be a good biochemical indicator to distinguish among group with different levels of protein intake. The purpose of this study is to evaluate an indicator of protein intake on the elementary school children ranged from 6 to 8 years of age living in rural and urban areas. Each child measured for height and weight of body. Weight measured by means of a plate from scale and height by a vertical measuring rod. Biochemical test were from a finger-tip and urine. Hemoglobin level in the blood was measured by cyanomethemoglobin method. Hematocrit was measured by microcentrifuge method. From the urine samples, urea nitrogen and urea creatinine were determined by Folin-Wu method and calculated the ratio. The following results were obtained: 1. Mean of the body weight and height in urban children (Seoul) was higher and heavier than rural children (Kyunggi, Kangwon). And 12% of boys, 18% of girls in Kyunggi and 25% of boys, 22% of girls in Kangwon area weight were less than 80% of Korean Physical Standard weight level. 2. The mean hemoglobin vialues of boys and girls in Seoul are children were 13.3g/100ml, 13.1g/100ml ad the mean of hemoglobin values in kyunggi 12.9g/100ml of boys, 12.4g/ml of girls, and 12.4g/100ml of boys, 12.9g/100ml of girls in Kangwon children. It is found that 22% to 24% children in rural area (Kyunggi, Kangwon) had hemoglobin level less than 12g/100ml which means anemia. 3. The mean of hematocrit level of Seoul, boys and girls children were 33.5%, 34.1% and 33.4%, 33.1% in Kyunggi area and 33.1%, 32.9% in Kangwon area. 4. Urea nitrogen/creatinine ratios in Seoul children were 9.0, 10.0 of boys and girls, the ratio were 8.2, 8.0 in Kyunggi boys and girls children, and 7.5 and 7.4 in Kangwon boys, girls children. Low-income rural and upper-income urban background large differences between two groups in the urea nitrogen/creatinine ratio (Seoul: Kangwon in male, female children, P<0.05, P<P0.001). The urea nitrogen/creatinine ratio definetly seems to be a good indicator of the quantity of the protein intake. However, whether or not it is an indicator of the quality of the ingested protein remains to be seen.