• 한국전자통신학회논문지
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• 제13권1호
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• pp.187-192
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• 2018

본 연구는 국가자료인 2012년도 국민건강영양조사 자료를 이용하여 20세 이상 성인(n=5,889)에서 비만 및 복부비만과 맥압(Pulse pressure, PP)의 관련성을 평가하고자 실시하였다. 연구결과에서 맥압에 대한 관련변수(연령 포함)를 보정하였을 때, 여성에서는, High PP (PP >61mmHg)의 위험비가 정상 체중군에 비하여 비만군에서 1.37 (95 % CI, 1.03-1.82)로 유의하게 높았고, 복부비만이 아닌 군에 비하여 복부비만군에서 1.38배 (95% CI, 1.07-1.78)로 유의하게 높았다. 그러나 남성에서는 비만 및 복부비만은 High PP와 유의한 관련성 없었다. 결론적으로 여성에서는 비만과 복부비만이 맥압을 증가시키지만, 남성에서는 유의한 관련성이 없었다.

• 대한한방부인과학회지
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• 제26권1호
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• pp.82-91
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• 2013

Objectives: The purpose of this study is to find out the patterns of teenage girls who is easy to suffer from Menstrual Disorders. Methods: The data from the 1681 participants were collected using a structured menstrual history questionnaire. Based on the survey responses, we had 97 adolescents with menstrual disorder as the test group and 97 adolescents without menstrual disorder as the control group. The clinical trials subjects were asked to respond to another questionnaire for identifying Blood Pressure Pulse Analyzer tests. We identified significant variables for dysmenorrhea from comparison between the test and control group; a binary response variable from the test group's responses for ever experiencing dysmenorrhea and explanatory variables from Blood Pressure Pulse Analyzer. Results: The reselts of Blood Pressure Pulse Analyzer test showed that the score of Energ_R, EIX_R were lower in dysmenorrhea group than the control group. The reselts of Blood Pressure Pulse Analyzer test showed that the score of Energ_R, EIX_R were lower, and T4_R were higher in hypomenorrhea group than the control group. The reselts of Blood Pressure Pulse Analyzer test showed that the score of Energ_R, EIX_R were lower in Irregular Menstruation group than the control group. Conclusions: Blood Pressure Pulse Analyzer test showed that the score of Energ_R, EIX_R were lower in the test group than the control group.

• 한국군사과학기술학회지
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• 제9권2호
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• pp.136-142
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• 2006

A damped sinusoidal electromagnetic pulse generator was designed, fabricated and tested. The pulse generator consisted of an oscillator(a spark gap switch and an initially charged low impedance line) and a high impedance antenna. This generator was capable of producing damped sinusoidal pulses at closure of the spark gap switch. A Marx generator was employed to supply the Pulse generator with high voltage pulses. While the pulse generator was provided with the high voltage pulses of 200kV from the Marx generator, its output power was maximized by controlling the pressure of the gas contained in the spark gap switch. The output power of the damped sinusoidal electromagnetic pulse oscillator was 1.3GW and the amplitude of electric field radiated from the pulse generator was 4kV/m at the range of 25m.

• 대한임상검사과학회지
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• 제53권3호
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• pp.241-248
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• 2021

본 연구는 고혈압이 있는 대한민국 성인에서 아스파르트산 아미노전이효소(aspartate aminotransferase, AST)/알라닌 아미노전이효소(alanine aminotransferase, ALT) 비율과 맥압(pulse pressure, PP) 사이의 관계를 평가하기 위해 수행되었다. 제6차 국민건강영양조사(KNHANES VI-3, 2015)에서 성인 1,515명의 데이터를 분석했다. 본 연구에서는 몇 가지 중요한 결과가 있다. 첫째, AST (odds ratio [OR], 1.018; 95% confidence interval [CI], 1.002~1.033), ALT (OR, 0.982; 95% CI, 0.969~0.996) 및 AST/ALT ratio (OR, 1.367; 95% CI, 1.027~1.819)는 고PP 결정하는 독립적인 요인이었다. 둘째, 관련변수(연령, 성별, 흡연, 음주, 규칙적인 운동, TC, TG, HDL-C, FBG, BMI, WC)를 조정한 후의 결과에서 AST/ALT ratio의 1 사분위에 대한 고PP의 OR을 기준으로, AST/ALT ratio의 2 사분위(OR, 1.188; 95% CI, 0.817~1.727) 및 AST/ALT ratio의 3 사분위(OR, 1.169; 95% CI, 0.800~1.710)는 유의하지 않았지만, AST/ALT ratio의 4 사분위(OR, 1.632, 95% CI, 1.113~2.393)에서 유의하게 높았다. 결론적으로, 고혈압이 있는 대한민국 성인에서 고PP은 AST/ALT ratio 및 AST와 양의 상관관계가 있었지만 ALT와 음의 상관계가 있었다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.634-637
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• 2004

This paper presents a Split Hopkinson Pressure Bar(SHPB) technique to obtain compressive stress-strain data for rubber materials. An experimental technique that modifies the conventional Split Hopkinson Pressure Bar(SHPB) has been developed for measuring the compressive stress-strain responses of materials with low mechanical impedance and low compressive strengths such as rubber. This paper introduces an all-polymeric pressure bar which achieves a closer impedance match between the pressure bar and the specimen materials. In addition, we are a pulse shaper to lengthen the rising time of the incident wave to ensure stress equilibrium and homogeneous deformation of a rubber materials. It is found that the modified technique can be determine the dynamic deformation behavior of an NBR rubber more accurately.

• 한국항공우주학회지
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• 제47권8호
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• pp.599-606
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• 2019

펄스건 장치는 연소실 내, 다중 분사기 배열에 따른 연소 유동장으로의 횡단 압력파 전파/감쇠 메커니즘 규명을 목적으로 제작되었다. 제작된 펄스건은 성능시험을 통해 목표 연소압에서의 운용 가능 여부와 압력파 강도 제어 여부를 확인하였다. 기체질소를 사용하여 고압관에 가압을 하였으며 다이아프램에는 $100{\mu}m$ 두께의 OHP 필름을 사용하였다. 압력파의 속도와 강도를 확인하기 위해 압력 트랜스듀서를 이용하여 동압과 정압을 측정하였다. 제작된 펄스건은 공급압력에 따라 압력파의 강도 조절이 가능하며 횡방향성을 가지는 압력파를 생성할 수 있음을 성능시험을 통해 확인하였다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.834-837
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• 2005

In this paper, we describe the method of non-invasive blood pressure measurement using pulse wave transit time(PWTT). PWTT is a new parameter involved with a vascular that can indicate the change of BP. PWTT is measured by continuous monitoring of ECG and pulse wave. No additional sensors or modules are required. In many cases, the change of PWTT correlates with the change of BP. We measure pulse wave using the photo plethysmograph(PPG) sensor in an earlobe and we measure ECG using the ECG monitoring device our made in the chest. The measurement device for detecting pulse wave consists of infrared LED for transmitted light illumination, pin photodiode as light detector, amplifier and filter. We composed 0.5Hz high pass, 60Hz notch and 10Hz low pass filter. ECG measurement device consists of multiplexer, amplifier, filter, micro-controller and RF module. After amplification and filtering, ECG signal and pulse wave is fed through micro-controller. We performed the initial work towards the development of ambulatory BP monitoring system using PWTT. An earlobe is suitable place to measure PPG signal without the restraint in daily work. From the results, we can know that the dependence of PWTT on BP is almost linear and it is possible to monitoring an individual BP continuously after the individual calibration.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2005년도 창립60주년 기념 추계 학술대회
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• pp.135.1-135.1
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• 2005

• 대한임상검사과학회지
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• 제48권3호
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• pp.183-187
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• 2016

본 연구는 국가자료인 2012년도 국민건강영양조사 자료를 이용하여 20세 이상 성인(n=4,948)에서 뇨 중 microalbumin과 맥압(Pulse pressure, PP)의 관련성을 평가하고자 실시하였다. 연구결과에서 연령, 성별, 흡연습관, 음주습관, 운동습관, WM, BMI, TC, TG, HDL-C, FBG, BUN, creatinine, 및 요 중 creatinine 등을 보정하였을 때, 뇨 중 microalbumin평균값에서, High PP (PP>60.0 mmHg) [$33.02{\pm}4.93{\mu}g/mL$ (95% confidence interval (CI), 23.37~42.68)]가 Normal PP ($PP{\leq}60.0mmHg$) [$22.57{\pm}1.63{\mu}g/mL$ (95% CI, 19.36~25.77)]에 비하여 유의하게 높았다(p=0.047). 결론적으로 대한민국 성인에서 PP의 증가는 뇨 중 microalbumin의 증가와 유의한 관련성이 있었다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2009년도 정보 및 제어 심포지움 논문집
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• pp.138-140
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• 2009

Hemorrhage shock occupies high rate in trauma patient's mortality and blood pressure is the variance that judges early diagnosis and the effect of remedy. Systolic blood pressure is related to pulse transit time(PTT). PTT means the time that is required to flow from the heart to peripheral artery. PTT is influenced from the length, cross section and stiffness of the blood vessels. It is hard to evaluate the correlation between systolic blood pressure and PTT because they are variable in human body. In this paper, we evaluated the correlation between the systolic blood pressure and PTT in normal and hemorrhage states using standardized rat. PTT is defined as the time differences between the R peak and the peak of pulse wave. The analyzed time differences of ECG and blood pressure are analyzed every 5minutes for 30 seconds when there is before and after bleeding. Before bleeding, systolic blood pressure and PTT are steadily preserved but when the bleeding comes started, systolic blood pressure is declined. However PTT was increased and decreased. Under the circumstance that the standardized rat is controlled by age, the length of the blood vessels, and any disease, it shows that PTT measurement using systolic blood pressure of bleeding is impossible.