• 한국산학기술학회논문지
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• 제13권9호
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• pp.4053-4064
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• 2012

본 연구의 목적은 아로마발반사요법과 발반사요법이 농촌의 본태성고혈압 노인 환자의 혈압, 맥박, 그리고 혈중지질농도에 미치는 효과를 확인하기 위함이다. 연구방법은 비동등성 대조군 전 후 유사 실험연구로, 2008년 6월 30일부터 8월 9일까지 6주간 충청남도 G군 소재 C보건진료소에 등록된 본태성고혈압 환자로 실험군 I(아로마 발반사요법) 24명, 실험군 II(발반사요법) 27명, 대조군(기존의 처치) 20명을 대상으로 하였다. 수집된 자료는 SPSS/WIN 12.0 프로그램으로 분석하였다. 연구결과는 6주 간 아로마발반사요법과 발반사요법을 각각 적용한 후 실험군 I과 실험군 II 모두 대조군에 비해 수축기 혈압(p<.05)과 이완기 혈압(p<.05)에서 유의한 차이를 보였고, 맥박수도 유의하게 감소하였으나(p<.05), 혈중지질농도의 변화는 세군 간에 통계적으로 유의한 차이가 없었다(p>.05). 결론적으로 아로마 발반사요법과 발반사요법은 농촌의 본태성고혈압 노인 환자의 혈압 하강과 맥박수 감소에 긍정적인 기여를 하는 것으로 나타났으므로 향후 아로마발반사요법과 발반사요법을 본태성고혈압 환자의 간호중재방법으로 활용 할 수 있을 것이다.

• 종양간호연구
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• 제1권2호
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• pp.204-216
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• 2001

The purpose of this study was to test the effects of foot reflexology on pain and mood in patients who have just had a mastectomy. The research design was a nonequivalent control group, non-synchronized design. The participants for this study were 28 patients with breast cancer on first or second day after mastectomy surgery. The first 12 patients were assigned to the control group and the second 16 to the experimental group. The study was conducted from October 28, 2001 to December 22, 2001 on a surgical unit of Y Medical Center in Seoul, Korea. Pain intensity, blood pressure, pulse rate and mood were measured as dependent variables. The instrument used for pain intensity and mood was a 10 cm visual analogue scale. Cronbach alpha for this study was .70. For the experimental group pre and post tests were done immediately before and 15 minutes after completion of foot reflexology. Foot reflexology was performed once for 20 minutes. After the pretest, patients in the control group were instructed to have a quiet time for a 35 minute period and then the post-test was done. The number of participants was small so the data were analyzed by Mann-Whitney U test, and Wilcoxon signed ranks test. The results of this study are as follow : 1. In the experimental group there were significant decreases between the pre and post tests for pain intensity (z=-3.47, p<.001), diastolic blood pressure (z=-2.67, p<.01) and pulse rate (z=-3.44, p<.001) but there was no difference between the two groups on the post test. 2. The systolic blood pressure, diastolic blood pressure and pulse rate were also not significantly different between the experimental group and the control group on the post test. 3. The mood score was significantly improved after foot reflexology(z=-3.52, p=.000) and the difference between the two groups was also significant (u=49.0, p=.03). In conclusion, there was a statistically significant difference in mood between the two groups, but no difference for pain intensity, blood pressure, or pulse rate. However, there were significant differences between the pretest and post-test for pain intensity, diastolic blood pressure and pulse rate in the experimental group. On the basis of the above findings, this study suggests that foot reflexology can be an effective method of relieving pain and improving mood in clinical practice in women who have had mastectomy surgery.

• 소음진동
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• 제11권2호
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• pp.285-291
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• 2001

The impingement of a weak shock wane discharged from the open end of a shock tube upon a flat plate was investigated using shock tube experiments and numerical simulations. Harten-Yee Total Variation Diminishing method was used to solve axisymmetric, unsteady, compressible flow governing equations. Experiments were carried out to validate the present computations. The effects of the flat plate and baffle plate sizes on the impinging flow field over the flat plate were investigated. Shock Mach number was varied in the range from 1.05 to 1.20. The distance between the plate and shock tube was changed to investigate the effect on the peak pressure. From both the results of experiments and computations we obtained a good empirical equation to predict the peak pressure on the flat plate.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 1998년도 춘계 학술대회논문집
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• pp.110-115
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• 1998

An axisymmetric Navier-Stokes procedure has been developed to analyze the pulse jet flow in a ceramic filter unit for the dust dislodging process. Using Baldwin-Lomax turbulence model as a closure relationship, the SIAF(Scalar Implicit Approximate Factorization) algorithm together with the ${\delta}^k-Correction$ iterative time marching scheme is adopted to solve the unsteady compressible Navier-Stokes equations. After some validation tests, the code has been applied to solve the pulse jet flow and examine the effects of geometry and reservoir pressure condition on the pressure level inside the filter unit. To avoid dealing with the uncertainty of such factors as the cohesion of the collected dust and the adhesion of the dust to the medium and also to simplify the analysis, the filter wall is assumed to be impermeable. The results for various test cases are presented.

• 설비공학논문집
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• 제29권7호
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• pp.366-372
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• 2017

The objective of this study was to characterize Waveguide-Blow-Cutoff (WBC) array for Electromagnetic Pulse (EMP) shield in air duct or water pipe, the typical pathway of pulse in indoor space with critical electronic device. A numerical investigation with three different WBC designs (circular, rectangular, and hexagonal or honeycomb) was conducted to satisfy recommended shielding effectiveness (SE) levels from 80 dB to 140 dB. Pressure drop between upstream and downstream of EMP shields based on WBC arrays was also investigated to understand air flow feature in air duct of HVAC system. Results showed that honeycomb geometry outperformed other shapes in terms of reducing the depth of EMP shield, thus providing better air flow in duct path with lower local loss coefficient in HVAC system under SE requirements.

• Advances in aircraft and spacecraft science
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• 제7권3호
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• pp.187-202
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• 2020

The exhaust nozzle serves back pressure of Pulse detonation combustor, so combustion chamber gets sufficient pressure for propulsion. In this context recent researches are focused on influence of nozzle effect on single cycle detonation wave propagation and propulsion performance of PDE. The effects of various nozzles like convergent-divergent nozzle, convergent nozzle, divergent nozzle and without nozzle at exit section of detonation tubes were computationally investigated to seek the desired propulsion performance. Further the effect of divergent nozzle length and half angle on detonation wave structure was analyzed. The simulations have been done using Ansys 14 Fluent platform. The LES turbulence model was used to simulate the combustion wave reacting flows in combustor with standard wall function. From these numerical simulations among four acquaint nozzles the highest thrust augmentation could be attained in divergent nozzle geometry and detonation wave propagation velocity eventually reaches to 1830 m/s, which is near about C-J velocity. Smaller the divergent nozzle half angle has a significant effect on faster detonation wave propagation.

• 한국군사과학기술학회지
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• 제20권5호
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• pp.608-619
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• 2017

In this paper, the effects of parameters related to the residual stress induced due to laser shock peening process to determine mitigation of the initial tensile residual stresses are discussed, such as the maximum pressure, pressure pulse duration, laser spot size and number of laser shots. In order to estimate the influence of the initial tensile residual stresses, which is generated by welding in 35CD4 50HRC steel alloy, the initial condition option was employed in the finite element code. It is found that $2{\times}HEL$ maximum pressure and a certain range of the pressure pulse duration time can produce maximum mitigation effects near the surface and depth, regardless of the magnitudes of tensile residual stess. But plastically affected depth increase with increasing maximum pressure and pressure pulse duration time. For the laser spot size, maximum compressive residual stresses have almost constant values. But LSP is more effective with increasing the magnitudes of tensile residual stress. For the multiple LSP, magnitudes of compressive residual stresses and plastically affected depths are found to increase with increasing number of laser shots, but the effect is less pronounced for more laser shots. And to conclude, even though the initial tensile residual stresses such as weld residual stress field are existed, LSP is enough to make the surface and depth reinforcement effects.

• 대한한방내과학회지
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• 제30권3호
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• pp.525-533
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• 2009

Objectives : There are lots of reports that cardiovascular disease, including hypertension, cerebro-vascular accident, and coronary heart disease, is related to atherosclerotic changes. Increased serum levels of lipids could play a role in these changes. This study aimed to investigate the relationship between PWV and risk factors of cardiovascular disease, including serum lipid values. Methods : This study included 261 subjects ($49.32{\pm}11.79$ years, 112 male) who underwent PWV and serum lipid evaluation. We investigated the correlation between serum lipid values, blood pressure, body mass index (EMI) and PWV. Pearson's correlation and partial correlation analysis were applied to examine the relationship between PWV and risk factors of cardiovascular disease. Results : Serum triglyceride, total cholesterol, systolic blood pressure, and diastolic blood pressure were significantly correlated with PWV. Partial correlation coefficient adjusted by age yielded significant correlation between serum triglyceride, systolic blood pressure, diastolic blood pressure and PWV. Conclusion : In this study, it seems that there are significant relationships between PWV, triglyceride and blood pressure. We could suggest that PWV might have some relationships with Dam-eum and blood stasis in oriental theory.

• 한국전자통신학회논문지
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• 제14권6호
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• pp.1257-1264
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• 2019

기존의 Cuff 기반의 혈압(Blood Pressure)측정 방법은 연속적인 실시간 혈압측정에는 한계를 갖는다. 이러한 이유로 ECG와 PPG 센서 신호를 상호융합한 다양한 혈압추정이 이루어졌다. 그러나 PPG 중심에 측정기법은 AC 노이즈, 작은 맥동, 비박동 등의 많은 문제를 지니고 있다. 본 논문은 ECG와 PPG 관계에 발생하는 맥파전달시간(PTT)과 맥파속도(PWV)를 이용하여 혈압을 추론기법이다. 신호 피크를 이용하는 HRF(Height Ratio Features)에 비해, 본 제안방식은 ECG, PPG의 최고점 혹은 최저점을 사용한 시차를 이용해 추정하기 때문에 PPG 센싱 시그널의 오류에도 안정적인 추출이 가능한 장점이 있다. 본 논문에서 제안 방법을 이용하여 25만 회의 혈압측정의 결과 ±28.5%의 정확도를 갖는 혈압 추정기법을 제시할 수 있었다.

• 한국보건간호학회지
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• 제14권2호
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• pp.271-280
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• 2000

The purpose of this study was to identify the health status of elderly. Subjects were 132 older people who live in home and institution located Taejon metropolitan city. Data were collected from May 1997 to April 1998. To obtain data about health status of elderly. pulse, respiration, systolic and diastolic blood pressure. grip strength. pinch pressure. flexibility, arm circumference. triceps skin fold thickness were measured. Data were analyzed for frequency. percentage. t-test using SPSS pc+ program. The results were as follows: 1. $74.4\%$ of subjects was perceived as 'good' in their health status. 2. Mean pulse, mean respiration, systolic and diastolic blood pressure were with in normal limits. There were no statistical differences between men and women in pulse, respiration, systolic and diastolic pressure. 3. Left and right grip strength were 24.89 psi and 25.23psi. The grip strength in men was higher than that of women. It showed statistically difference between men and women in grip strength. 4. Left and right pinch pressure were 7 pound and 7.32 pound. There was statistically difference of pinch pressure between men and women. 5. left flexibility was better than right flexibility of subjects. There was no statistically significant difference between men and women in flexibility. 6. Arm circumference was 24.96cm and there was no statistically significant difference between men and women. 7. Mean skin fold thickness was 12.83 em. Skin fold thickness in men was lower than that of women. It showed statistically difference between men and women. From these results, further study should be considered gender differences in health status of elders and carried in larger sample than this study.