• Journal of Preventive Medicine and Public Health
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• 제46권5호
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• pp.249-260
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• 2013

Objectives: Previous observations propose that risk-taking behaviors such as cigarette smoking are prevailing among young people with chronic conditions including diabetes. The purpose of this study was to examine whether cigarette smoking is more prevalent among diabetics than non-diabetics and whether it differs by age at the time of diagnosis with diabetes from young adulthood (YAH) to adulthood (AH). Methods: We used US panel data from the National Longitudinal Study of Adolescent Health (Add Health Study) during the years 2001 to 2002 (Wave III, YAH) and 2007 to 2008 (Wave IV, AH). Multivariate logistic regression models were applied to estimate odds ratios (ORs) and 95% confidence intervals (CIs) of cigarette use behaviors according to age at the time of diagnosis with diabetes, after adjusting for demographic and selected behavioral factors. Results: Of 12 175 study participants, 2.6% reported having been diagnosed with diabetes up to AH. Early-onset diabetics (age at diagnosis <13 years) were more likely than non-diabetics to report frequent cigarette smoking (smoking on ${\geq}20$ days during the previous 30 days) in YAH (OR, 3.34; 95% CI, 1.27 to 8.79). On the other hand, late-onset diabetics (age at diagnosis ${\geq}13$ years) were more likely than non-diabetics to report heavy cigarette smoking (smoking ${\geq}10$ cigarettes per day during the previous 30 days) in AH (OR, 1.54; 95% CI, 1.03 to 2.30). Conclusions: The current study indicated that diabetics are more likely than non-diabetics to smoke cigarettes frequently and heavily in YAH and AH. Effective smoking prevention and cessation programs uniquely focused on diabetics need to be designed and implemented.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2006년도 춘계학술발표회 논문집
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• pp.305-309
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• 2006

SAR (Synthetic Aperture Radar) technology, which is not influenced by cloud cover because of using electromagnetic wave of long wavelength, has an advantage in mapping the earth. NASA, recognizing these strong points of SAR, launched SRTM (Shuttle Radar Topography klission), and acquired the topographic information of the earth. SRTM and NED (National Elevation Data) of USGS were used for the research and vegetation height map was produced through differentiating the two data. Correlation between SRTM-NED and planting year was analyzed to see the relationship. Strong correlation was detected and it shows the feasibility of estimating timber age and eventually creating timber age map from SRTM-NED. Additional analyses were conducted to check if the linearity is influenced by regional characteristics and forest uniformity. As results, the correlation between SRTM-NED and timber age is influenced by roughness of the terrain. Overall, this paper shows that timber age estimation using SRTM and NED can be sufficiently practical.

• 동의생리병리학회지
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• 제23권5호
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• pp.1035-1040
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• 2009

In this work, we investigate the effect of blood hematocrit level on the radial pulse wave to study the clinical application of the pulse analyzer. For this purpose, we measured the radial pulse wave at the left Gwan for 15 males with abnormal high hematocrit level and 47 males with normal hematocrit level at the age of thirties and forties. Various variables of the radial pulse wave between two groups were analyzed by Student's T test. We found significant differences in several characteristic variables in the amplitude, time-span and the integrated area of the amplitude and time of the pulse wave. The systolic peak in the amplitude of the radial pulse wave was higher in abnormal high hematocrit group. In contrast, the third peak from the second incisure was higher and longer in normal hematocrit group. Our study suggests that the radial pulse wave can be useful in distinguishing the patient group with high hematocrit level and thus with high blood viscosity. Our finding may motivate research activities towards diverse clinical applications of the pulse wave.

• 한국방사선학회논문지
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• 제13권6호
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• pp.873-878
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• 2019

뇌혈관 질환은 우리나라의 주요 10대 사망 원인 중 3대 사인에 해당하며, 이러한 질환은 동맥경화와 관련이 있으므로 동맥경화를 예측할 수 있는 인자의 진단 방향의 제시가 필요하다. 본 논문에서는 연령대별 상완-발목동맥 맥파전달속도와 뇌동맥 혈관 협착 및 혈압, 비만도, 복부비만과의 유의성을 평가하였으며, 뇌동맥 혈관 협착과 연령대별 유의성 평가는 50대의 연령대에서만 유의한 결과를 나타내었으며, 동맥경화의 위험인자인 혈압, 비만, 복부비만의 경우 전체 연령대에서 유의한 결과를 나타내었다. 그리고 상완-발목동맥 맥파전달속도가 상승하였을 경우, 뇌동맥 혈관 협착은 전체 1,376명중 788명으로 57.2%의 분포를 나타내었으며, 위험인자인 혈압의 경우, 전체 7,557명중 3,255명으로 43%, 비만도는 2,708로 35.8%, 복부비만은 2,941명으로 38.9%의 분포를 나타내었다. 이러한 결과를 통하여 상완-발목동맥 맥파전달속도 검사 시, 동맥경화가 의심된다면 우선적으로 뇌동맥 혈관 협착을 의심하고 뇌동맥 혈관 검사를 시행할 것을 권한다. 동맥경화의 위험인자인 혈압, 비만, 복부비만과의 유의성 평가를 통하여 향 후 유사 연구 시, 기초자료로 활용될 것이라고 사료된다.

• 한국한의학연구원논문집
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• 제13권2호통권20호
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• pp.71-74
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• 2007

Background : Sasang Constitutional Medicine (SCM) is the field of traditional Korean medicine that emphasize four constitutional types for diagnosis and treatment. Appearance, personalities and pathological characteristics are main factors of Sasang constitutional classification. Previous studies carried out by the pulse analyzer showed that the pulse wave can discriminate these types. In addition, It was reported that the pulse wave are affected by age and sexuality. In this study, we investigated the pulse wave characteristics related Sasang constitution types in control group regarding their age and sexuality. Subjects and Method : Two hudred and eighteen volunteers participated in this study: healthy men in $20{\sim}49$ years old. Participants were interviewed and examined to evaluate their health condition and Sasang constitution type. Then they were tested with pulse analyzer when they ere stabilized. The pulse at the radial artery just beside styloid process was measured, because this area is landmark for pulse diagnosis in oriental medicine. 3-D Mac pulse analyzer (Daeyo Medi Co. Ansan. Korea) was used in this study. We analyzed main features of pulse waves with the Sasang condtitution types by the SPSS for Windows (ver 12.0). Results : There was significant difference between Taeum and other types in contact pressure as weil as in coefficient of floating and sinking pulse. Conclusion : By analyzing pulse waves of healthy adult men. we found significant differences exist between Taeum and other types. These pulse differences may characterize Taeum type, and it will be helpful for the evaluation of Taeum type.

• 지질공학
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• 제32권1호
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• pp.173-191
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• 2022

본 연구에서는 Flat TDR을 이용하여 지반의 전단파속도를 측정하였고 측정값의 정밀도 분석 및 현장적용성에 대한 검증을 수행하였다. Flat TDR 내 결합되어 있는 Piezo-stack을 이용하여 현장에서의 전단파속도 측정값을 도출하였고, 도출한 값의 검증을 위해서 들밀도시험, 동적콘관입시험(DCPT), 문헌조사 등을 적용하여 비교·분석하였다. 실험결과 그라우트재 주입시 재령 초기 전단파속도 변화의 평균값은 10.15 m/s이며, 7~14일차 이후의 전단파속도 변화의 평균값은 65.99 m/s로 재령일 증가하는 경향을 보였다. 또한 OMC를 기준으로 건조 측에서는 함수비가 증가할수록 건조밀도와 전단파속도가 증가하고, 습윤 측에서는 함수비가 증가할수록 건조밀도와 전단파속도가 감소하는 것을 알 수 있었다. 현장시험 결과 도출된 전단탄성계수 값이 최소 17.36 MPa에서 최대 28.13 MPa로 확인되어 참고문헌 값과 유사한 측정값을 확인하였다. 이를 통해 Flat TDR을 이용한 전단탄성계수의 측정값이 신뢰성이 있는 데이터임을 알 수 있고, 추후 현장 지반의 다짐관리를 효과적으로 할 수 있음을 판단할 수 있다.

• 동의생리병리학회지
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• 제22권6호
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• pp.1403-1409
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• 2008

The purpose of this study is to develop the systematic process on the discrimination of Sasang constitution with the pulse diagnosis apparatus. The pulse waves were acquired at the right and the left Guan point with 1420 people who were apparently healthy. In order to minimize the effect of aging on the shape of pulse wave, the age groups of 30s, 40s, and 50s were used. Taeum group was the best to classify, Soyang group was the worst. With the same group size, the sensitivity of Soyang group was increased. Input variables were selected with the consideration of the floating-sink ratio, tests of equality of group means, multiple comparison, multicollinearity, and structure matrix. To increase the sensitivity of Soyang, the variables which could tell the difference between Soyang and Soeum were selected.

• 콘크리트학회논문집
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• 제12권6호
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• pp.67-74
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• 2000

The usage of nondestructive testing on early-aged concrete leads to enhacned safty and allows effective scheduling of construction, thus making it possible to maximize the time and cost efficiencies. In this study, a reliable nondestructive strength evaluation method for early-aged concrete using the longitudinal wave velocity is proposed. Compression tests were performed to examine factors influencing the velocity-strength relationship of concrete, such as water-cement (w/c) ratio, fine aggregate ratio, curing temperature, and curing condition. The test results show that a change in the w/c ratio and curing temperature has minor effect on the velocity-strength relationship/ However, curing condition significantly influences the velocity-strength relationship of early-aged concrete. Moreover, the longitudinal wave velocity increases with decreasing fine aggregate ratio. It is concluded from this study that the strength evaluation of early-age concrete can be achieved by a nonlinear equation which considers the effects of curing condition and fine aggregate ratio.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.1674-1678
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• 2008

본 연구에서는 심장의 세포 변화에서부터 혈류 순환의 시스템 변화까지 일련의 과정을 시뮬레이션 할 수 있는 통합모델을 개발하였다. 본 통합 모델을 이용하여 대동맥의 탄성도 변화 따른 Pulse Wave Velocity를 추정하였으며 심근의 수축 Mechanics의 변화를 시뮬레이션 하였다. 심장은 단순한 구 형상으로 모델링 되었다. 특히 동맥순환의 특성인 Wave propagation 과 Wave deflection의 현상을 모델링하기 위해 기존 모델에서 사용된 동맥계 순환 모델을 수정하였다. 즉 기존의 동맥 모델을 1차원의 운동방정식과 연속방정식을 기반으로 하는 Distributed arterial model로 대체하였다. Distributed arterial model은 혈액의 점성에 의한 에너지 손실, 혈관의 점탄성 효과 그리고 분지 되는 혈관에서의 에너지 손실을 포함하는 정교한 동맥 순환 모델이다. 정교한 동맥계 순환 모델의 동맥 탄성도 값을 조절함으로써 탄성도 변화에 대한 PWV를 계산 할 수 있었다. 이러한 수치적 방법을 사용하여 노화에 따른 동맥벽 탄성도의 저하가 심근세포의 Cross-bridge 동역학에 미치는 영향을 시뮬레이션 하였다.

• 콘크리트학회논문집
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• 제11권4호
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• pp.157-167
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• 1999

Among several non-destructive testing methods, ultrasonic pulse velocity method and rebound index method have been widely used for the evaluation of concrete strength. However, such methods might not provide accurate estimated results since factors influencing the relationship between strength and either ultrasonic pulse velocity or rebound index are not considered. In this paper, the evaluation method of concrete strength using rod-wave velocity measured by impact-resonance method is proposed. A basic equation is obtained by the linear regression of velocity vs, strength data at specific age and then, aging factor is employed in the equation to consider the difference of the increasing rate between wave velocity and strength. Strengths predicted by the proposed equation agree well with test results. Furthermore, the combined method of rod-wave velocity and rebound index is proposed.