• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 학술대회 논문집 전문대학교육위원
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• pp.116-119
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• 2001

In this research, we detect the charge state within $0.1{\sim}0.3[A]$ and develop the intelligent digital charge device by applying a fine pulse signal using PWM inverter and Proportional-Integral(PI) controller which uses micro -processor and intelligent technique. The ripple rate is within ${\pm}1%$, and the indicator error rate of full charge state is within ${\pm}1%$, and the voltage stability is within ${\pm}0.1[V]$, and the accuracy of voltage detect is 48[V] and ${\pm}0.5[V]$ in the reference of 100[A].

• 동의생리병리학회지
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• 제22권6호
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• pp.1368-1373
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• 2008

This study was done to calculate the specific indicators of Fire-Heat Pattern Identification and Yin Deficiency Pattern Identification settled by tentative Korean Standard Differentiation of the Symptoms and Signs for Stroke. The subjects were 764 hospitalized patients with stroke, and a list of registry was made for each of them. Frequency and Correlations among Fire-Heat and Yin Deficiency indicators were studied. Fire-Heat pattern group included 175 patients out of 764, Yin Deficiency pattern group included 103 patients out of 764. Among the indicators of Fire-Heat pattern, those, in order of highest frequency, were 'heat vexation and aversion to heat', 'reddened complexion', 'thirst'. Among the indicators of Yin Deficiency pattern, those, in order of highest frequency, were 'dry mouth', 'red tongue', 'fine and rapid pulse'. Among the Fire-Heat pattern indicators, 'yellow fur' and 'thirst', 'heat vexation in the chest' and 'vexation and insomnia' showed most significant correlation. Among the Yin Deficiency pattern indicators, 'aphtha or tongue sore' and 'heat in the palms and soles', 'red tongue' and 'dry fur' showed most significant correlation. 'Reddened complexion', 'dry eyes', 'surging and parid pulse', 'heat vexation and aversion to heat' are classify between Fire-Heat pattern and Yin Deficiency pattern. 'Surging and parid pulse', 'Reddened complexion' are mostly representative of Fire-Heat pattern and 'fine and rapid pulse' are mostly representative of Yin Deficiency pattern.

• 대한한의진단학회지
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• 제9권1호
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• pp.112-124
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• 2005

Background: PWV is determined by dividing the distance by the time taken for the pulses traveling between two measuring sites, used as a marker of arterial stiffness and an important indicator for cardiovascular disease. Methods: A PWV measurement system, which offers a non-invasive, simple method of measurement, and simultaneous recording of six signlas(ECG, PCG and four pulse waves from carotid, femoral, radial and dorsalis pedis arteries) was developed. Seventeen healthy subjects with a mean age of 33 years(22 to 52) without any cardiovascular disease were participated for the experiment. Two observers(A and B) performed two consecutive measurements from the same subject in a random order. For the evaluation of stability and accuracy of the PWV measurement system, reproducibility of PWV from between-observer were also evaluated. Results: PWV $values(Mean{\pm}SD)$ measured by A were $7.07{\pm}1.48m/s$, $8.43{\pm}1.14m/s$ , $8.09{\pm}0.98m/s$ for aorta, arm, and leg, respectively. The values obtained from B were $6.76{\pm}1.00m/s$, $7.97{\pm}0.80m/s$, and $7.97{\pm}0.72m/s$ for aorta, arm, and leg, respectively. Between-observer $differences(mean{\pm}SEM)$ from the aorta, arm and leg were $0.14{\pm}0.15m/s$, $0.18{\pm}0.10m/s$ and $0.07{\pm}0.10m/s$. Reproducibility coefficients(2SD) from the aorta, arm, and leg were 0.62m/s, 0.84m/s and 0.86m/s. Correlation coefficients were significantly higher in aortic PWV, 0.93, compared to the coefficients for arm and leg. Coefficient of variance which reflects the reproducibility of the system ranged from $4.4{\sim}5.8%$ in all regional PWV. , Conclusion: Reproducibility of PWV in the study shows that the developed system has reliable and reproducible characteristics. The PWV measurement system used for the study offers comfortable and simple operation and provides accurate analysis and results with high reproducibility. Results of the PWV measurement system could contribute to various clinical applications in the future.

• 동의생리병리학회지
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• 제22권2호
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• pp.487-496
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• 2008

The purpose of this study is to investigate clinical frequency and priority of five pattern identification settled by Korean Standard Differentiation of the Symptoms and Sign for Stroke. The present study was done over 177 hospitalized patient with stroke in the Daejeon University Oriental Medical Hospital in the period of November 2006 to July 2007. Stroke patients had been interviewed by residents and specialists who studied standard operation procedures in Fundamental study for Standardization and Objectification of Differentiation and Pattern Identification of Syndrome of Oriental Medicine for Stroke. In Heat-transformation pattern group, men showed significantly high frequency and in Deficiency of Gi pattern group, women showed significantly high frequency. In Heat-transformation pattern group, the indicators such as 'aversion to heat during fever', 'flushed face', 'full and rapid pulse', 'dryness of the eyes, 'yellow coating of the tongue', 'feverishness of the limbs', 'dryness of the eyes' showed significantly high frequency. In Dampphlegm syndrome group, the indicators such as 'white coating of the tongue', 'yellowish face', 'thick coating of the tongue', 'wheezing in the throat with sputum', 'swollen tongue', 'slippery pulse' showed significantly high frequency. In Deficiency of Gi pattern group, the indicators such as 'pale tongue', 'lassitude', 'pale face', 'weakness pulse' showed significantly high frequency. In Deficiency of Eum group, the indicators such as 'short and rapid pulse', 'mirror-like tongue' showed significantly high frequency. For more sensitive Korean Standard Differentiation of the Symptoms and Signs for Stroke, Large scale study is to be done, giving weight on the important indicators.

• 한국통신학회논문지
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• 제28권12A호
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• pp.951-957
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• 2003

통신 시스템의 무선성능 요구조건 분석은 시스템의 성능을 예측하는 중요한 지표이다. 아직 표준안이 제정되지 않은 UWB(Ultra Wide Band) 시스템은 명확한 시스템 성능 요구조건을 유도하기 어렵다. 또한, 기존의 UWB 시스템과 멀티밴드 UWB 시스템의 무선성능 요구조건 분석에는 차이점이 있다. 이러한 차이점을 본 논문을 통해 분석하였으며, 이를 바탕으로 도출한 멀티밴드 UWB 시스템의 성능 요구조건을 본 논문에 기술하였다. 멀티밴드 UWB 시스템은 Sub-Band의 수에 따라 Throughput, 송신 최대 전력, 수신감도 등이 변화하는 것을 관찰할 수 있었다. 또한, 멀티패스의 영향으로 PRF(Pulse Repetition Frequency)를 변경하면 Link Margin은 증가하여 멀티패스 에너지 손실(Multi-path Energy Loss)에 대한 보상으로 멀티패스 마진(Multi-path Link Margin)이 발생하는 것을 알 수 있었으며 멀티패스 마진에 따라 수신신호 감도 및 간섭신호에 대한 저항성이 변화하는 것을 모의실험을 통하여 분석하였다.

• Journal of Preventive Medicine and Public Health
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• 제44권6호
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• pp.260-266
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• 2011

Objectives: We evaluated the association between common carotid artery intima-media thickness (CCA-IMT), brachialankle pulse wave velocity (baPWV), carotid plaque, and peripheral arterial disease (PAD) as indicators of macroangiopathy and diabetic retinopathy as an indicator of microangiopathy in type 2 diabetic patients. Methods: We analyzed 605 type 2 diabetic patients registered at a public health center in Korea. Following overnight fasting, venous blood and urine samples were collected and analyzed. The CCA-IMT, levels of carotid plaque, baPWV, and ankle-brachial index (ABI) of the subjects were assessed. We used non-mydriatic fundus photography to diagnose diabetic retinopathy. Multiple logistic regression analyses were used to evaluate the association between macroangiopathy and diabetic retinopathy. CCA-IMT and baPWV were divided into tertiles: CCA-IMT, 0.39 to 0.65 mm, 0.66 to 0.78 mm, and 0.79 to 1.30 mm; baPWV, 9.9 to 15.8 m/s, 15.9 to 18.9 m/s, and 19.0 to 38.0 m/s. Results: The association between baPWV and diabetic retinopathy remained significant after adjustment, with an increasing odds ratio (OR) in the second tertile (OR, 2.41; 95% confidence interval [CI], 1.27 to 4.55) and the third tertile (OR, 4.63; 95% CI, 2.33 to 9.21). No significant differences were observed in carotid plaque, PAD, and each tertile of CCA-IMT. Conclusions: BaPWV was associated with diabetic retinopathy, while CCA-IMT, carotid plaque, and PAD were not. This study suggests that the association between macroangiopathy and microangiopathy may be attributable to functional processes rather than structural processes within the vascular system.

• 대한전자공학회논문지
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• 제22권1호
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• pp.41-45
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• 1985

디지탈 이동물체지시기 계통(DMTI System)에서 신호대잡음비(SNR)의 저하는 적정처리 전에 디지탈 이동물체지시기의 출력펄스를 weightlng시킴에 의하여 개선될 수 있구 #정상살기의 수가 증가함에 따라 신호대잡음비가 개선됨을 나타내었다. Optimum weighting으로 얻어진 신호대잡음비는 binomial weighting으로 얻어진 것보다 더 커짐을 알았다. 컴퓨터 시뮬레이션 결과를 통하여 각각의 경우에 대한 신호대잡음비의 배선특성을 나타낸다.

• 센서학회지
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• 제19권1호
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• pp.17-24
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• 2010

This paper describes a real time reliable monitoring method and analysis system using wrist type oximeter for ubiquitous healthcare service based on IEEE 802.15.4 standard. Photoplethysmograph(PPG) is simple and cost effective technique to measure blood volume change. In order to obtain and monitor physiological body signals continuously, a small size and low power consumption wrist type oximeter is designed for the measurement of oxygen saturation of a patient unobtrusively. The measured data is transferred to a central PC or server computer by using wireless sensor nodes in wireless sensor network for storage and analysis purposes. LabVIEW server program is designed to monitor stress indicator from heart rate variability(HRV) and process the measured PPG to accelerated plethysmograph(APG) by appling second order derivatives in server PC. These experimental results demonstrate that APG can precisely describe the features of an individual's PPG and be used as estimation of vascular elasticity for blood circulation.

• Journal of Community Nutrition
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• 제2권2호
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• pp.105-109
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• 2000

To investigate the correlation between college women's energy intake and body fat percentage, this study was undertaken with 116 college women aged 19-24 years. The subjects were 20.9 years old on the average, and mean height and weight was 161.3 cm, 51.2 kg. Blood pressures were 112.4 mm Hg(systolic pressure), 70.2 mmHg(diastolic pressure). The number of pulse was 75.5 count/min. The energy intake and percent body fat were examined. The average intake of energy was 7652kcal/day(82.3% of RDA), which was lower than the recommended amount. It was similar to the level of energy intake of Korean women. BMI was 19.7 and body fat percent was 24.4%, so they appeared plump. According to BMI, 43.1% of subjects was grouped into normal, 56.9% was thin ; there was no difference between groups in age and stature. Also, normal group(27.1%) shoed significantly higher body fat percent(27.1%) than thin group(22.3%). But, body fat percent of thin group according to BMI was shown normal. Therefore, it may be thought that BMI is unsuitable indicator in this study. As a result of analyzing the correlation between body-measuring value and food intake, body fat percent against body weight and BMI was significant at the level p<0.001, but thee was no significant correlation with food intake. Therefore, it is desirable to recommend a healthful dietary lifestyle and activities for young women who want to reduce body weight due to excessive concerns regarding their outward figure.

• Journal of Genetic Medicine
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• 제14권1호
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• pp.8-17
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• 2017

Purpose: Pulse wave velocity (PWV) is an indicator of arterial stiffness, and is considered a marker of vascular damage. However, a genome-wide association study analyzing single nucleotide polymorphisms (SNPs) associated with brachial-ankle PWV (baPWV) has not been conducted in healthy populations. We performed this study to identify SNPs associated with baPWV in healthy populations in Korea. Materials and Methods: Genomic SNPs data for 2,407 individuals from three sites were analyzed as part of the Korean Genomic Epidemiologic Study. Without replication samples, we performed multivariable analysis as a post hoc analysis to verify the findings in site adjusted analysis. Healthy subjects aged between 40 and 70 years without self-reported history or diagnosis of hypertension, diabetes, hyperlipidemia, heart disease, cerebrovascular disease and cancer were included. We excluded subjects with a creatinine level >1.4 mg/dL (men) and 1.2 mg/dL (women). Results: In the site-adjusted association analysis, significant associations (P<$5{\times}10^{-8}$) with baPWV were detected for only 5 SNPs with low minor allele frequency. In multivariable analysis adjusted by age, sex, height, body mass index, mean arterial pressure, site, smoking, alcohol, and exercise, 11 SNPs were found to be associated (P<$5{\times}10^{-8}$) with baPWV. The 5 SNPs (P<$5{\times}10^{-8}$) linked to three genes (OPCML, PRR35 and RAB40C) were common between site-adjusted analysis and multivariable analysis. However, meta-analysis of the result from three sites for the 11 SNPs showed no significant associations. Conclusion: Using the recent standard for genome-wide association study, we did not find any evidence of significant association signals with baPWV.