• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.05a
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• pp.349-352
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• 2009

최근 유비쿼터스 헬스케어가 부각됨에 따라 심장의 활동상태를 보다 편리하게 측정하기 위하여 이동성 및 휴대성을 강조한 심전도 계측 시스템 및 스트레스 상태를 분석하기 위한 연구들이 수행되고 있다. 하지만 기존 심전도 계측은 전극의 부착 및 계측시스템과의 연결을 위한 리드선의 사용으로 인해 활동의 불편함을 유발한다. 본 연구에서는 기 연구 수행된 가정 또는 사무실에서 무구속적인(unconstrained) 방법으로 지속적인 심장의 활동상태의 모니터링이 가능한 무구속 의자형 심탄도 계측 시스템을 구현하였다. 무구속적인 방법으로 심탄도 신호를 계측하고 심탄도신호로부터 심박동변이율을 추출함으로써 일상생활 중 스트레스를 모니터링 하고자 하였다. 구현된 시스템을 통한 스트레스 모니터링의 가능성을 평가하기위하여 안정상태의 심박동변이율과 인위적인 신체적 스트레스인 Valsalva 조작를 유도한 후 심박동 변이율을 비교평가 하였다. 건강한 대학생 10명을 대상으로 비교분석을 수행한 결과 안정 상태와 육체적 스트레스 인가 후 심박동 변이율의 변화 양상을 관찰할 수 있었으며, 무구속적인 방법에 의해 스트레스의 모니터링이 가능함을 확인 할 수 있었다.

• Journal of Korea Water Resources Association
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• v.36 no.5
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• pp.839-849
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• 2003

Drought is one of the major environmental disasters. Weather data, particularity rainfall, are currently the primary source of information widely used for drought monitoring. However, weather data are often from a very sparse meteorological network, incomplete and/or not always available in good time to enable relatively accurate and timely drought detection. Data from remote sensing platforms can be used to complements weather data in drought. Therefore, data obtained from the Advanced Very High Resolution Radiometer(AVHRR) sensor on board the NOAA polar-orbiting satellites have been studied as a tool for drought monitoring. The normalized difference vegetation index(NDVI)-based vegetation condition index(VCI) were used in this study These indices showed their excellent ability to detect vegetation stress due to drought. The results clearly show that temporal and spatial characteristics of drought in Korea can be detected and mapped by the VCI index.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.10
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• pp.3833-3838
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• 2010

Brainwave can be the most effective means of detecting the state of the brain that changes moment by moment. Since brain has closed relations with hormones which are a foundation of metabolism, it needs to examine closely the mutual relationship between brainwave and hormone. We examined the possibility to find out such information about metabolism by comparing brainwave with cortisol hormone. The major variables are anti-stress quotient of brainwave and cortisol density which give stress information of the working women, to measure from March 3 to May 28, 2007. To find out the relationship between them, we performed such statistical analysis about the before and after of brainwave training as t-test, correlational analysis and regression analysis. We obtained following results: First, considerable changes of variables is shown by brain-wave training. Second, there exist a correlation between variables. Third, according to regression analysis, influence between variables is verified. Thus, we found that stress information of hormone analytical level can be obtined only through brainwave analysis.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.6
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• pp.2554-2560
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• 2011

This study is focused on the effects of one's blood type on emotional character and anti-stress by comparing each individual's brain wave. Observed records are from those kids who volunteered for KRIJUS(Korea Research Institute of Jungshin Science)'s brain wave measurement from September 2006 to December 2009. The whole 4636 adult(20-59 age) group consists of 3221 female and 1415 male. Blood types are as follows; A>B>O>AB dominately ordered. The result shown no relations between the blood types of adult and their emotional character. But meaningful difference had been revealed between the blood type and stress resistancy; type O rated higher scores in awarness and stress resistancy then other types, which shows that type O has more ability to redudce its stress. This study revealed meaningful relation between blood types and emotional character among several categoties, while suggesting follow-up researches figuring out more detailed explanations for its effect and genetic role.

• Journal of Digital Convergence
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• v.14 no.12
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• pp.633-644
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• 2016

The purpose of this study was to examine the effect of phytoncide Aroma inhalation and exercise combination therapy on the college life stress, mood state and sleep pattern of the university students. Participants were 72 college students of four groups of Phytoncide Aroma Inhalation group(n=18), Exercise group(n=17), Phytoncide Aroma Inhalation and exercise combination therapy group(n=17), control group(n=20). Research subjects pre-test(0week), mid-test(6week), post-test(12week) measurement was made equally on college life stress, mood state and sleep pattern. As a result, mood status, college life satisfaction and sleep scores were improved in all groups except the control group. Especially, phytoncide inhalation and exercise combination therapy group showed the greatest change in scores.

• Korean Journal of Psychosomatic Medicine
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• v.11 no.2
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• pp.137-148
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• 2003

Introduction: This research was performed to contract the attitude of dietary restriction and the psychological problems such as depressive mood and perceived stress and to investigate the relationship of these and obesity in women who visited the obesity clinic. Methods: During May 2001, sociodemographic variables, physical characteristics, Three Factor Eating Questionnaire(TFEQ), Symptom Check List-90-R(SCL-90-R) and Perceived Stress Scale were assessed from 150 female who visited the obesity clinics which were located at downtown, Seoul and the Hospital of Ajou University, Medical College. Hamilton depression rating scale(HDRS) was estimated by author. And then 116 female cases who filled up the questionnaire faithfully were included. Results: Obese group more than Body Mass Index(BMI) $25.0kg/m^2$ was 50% of the total subjects. BMI was increased as the age goes up(p<0.001). The frequency of unmarried cases in the under normal weight group was high rate of 48.8% while it in the obese group was 13.8%(p<0.001). There was no significant difference in the rate of smoking and alcohol drinking among subjects by BMI. There was no significant difference of TFEQ among subjects by BMI and the percent of body fat. Factor 2(r=0.27, p<0.01) and Factor 3(r=0.24, p<0.01) were significantly correlated with Global Severity Index(GSI). Only the paranoia scale among each estimated mean value of T scores of SCL-90-R by BMI was the significant difference between the overweight group and the obese group(p<0.05). T scores of scales of SCL-90-R were less than 50, but T scores of the under normal weight group and the obese group were higher than overweight group. GSI was significantly correlated with HDRS(r=0.75, p<0.01) and Perceived Stress Scale(r=0.32, p<0.01). Depressive mood in the obese group was significantly higher than non-obese group that HDRS was compared to two groups by the percent of body fat(p<0.05). Perceived Stress Scale was no significant correlation with BMI and the percent of body fat. All of the subject were in trouble of high stress. Stress affected dietary restriction owing that perceived stress had a relation with Factor 2(r=0.29, p<0.01) and Factor 3(r=0.37, p<0.01). Also, it affected psychological characteristics owing that perceived stress had a relation with the depression scale, GSI and HDRS(r=0.33, r=0.32, r=0.34, p<0.01). Conclusion: Obese women have more psychological difficulties including depression and high perceived stress, which closely related with the attitude of dietary restriction. Psychiatric intervention and aggressive assessment of psychological problems will be needed to the people who visit the obesity clinic in the future.

• 전자공학회논문지 IE
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• v.45 no.2
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• pp.1-5
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• 2008

In this work, RF performance degradation due to hot carrier effects in SOI MOSFET have been measured and analyzed. The LNA that designed at $V_{GS}=0.8V$, f=2.5GHz, gain is 16.51dB and noise figure is 1.195dB. After stress at SOI, the LNA's gain and noise figure change of 15.3dB and 1.44dB with before stress.

• Journal of Korean Biological Nursing Science
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• v.14 no.3
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• pp.147-155
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• 2012

Purpose: This study is to investigate perceived stress, depression, body mass index (BMI), and nutrient intakes of soldiers in the army. Methods: The subjects were 301 soldiers recruited from two divisions of the army in Kangwon-Do. The data was collected from August 3 to 9, 2009. Perceived stress, depression, lifestyle, dietary habits, BMI, and nutrient intake were assessed. Results: Subjects' distribution for normal weight, underweight, overweight, and obese was 67.4%, 0.7%, 16.3%, and 15.6%, respectively. BMI was related to class, service branch, duration of military service and being on a diet, whereas BMI was not found to be related to perceived stress, and depression. Some nutrient intakes such as dietary fiber, vitamin C, and Calcium was related to depression. Conclusion: This study suggests that soldiers need to undergo stress, depression management, and a nutritional education program.

• Journal of dental hygiene science
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• v.12 no.6
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• pp.583-590
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• 2012

The purpose of this study was to investigate effect of the economic stress and state-trait anxiety on the periodontal disease in order to prevent the occurrence and progression of periodontal disease. Date were collected from total of 326 subjects in their forties and fifties by using questionnaire and examination of periodontal states during the period from February to November 2011. Results were analyzed by using frequency, t-test, ANOVA and Multiple regression of SPSS ver. 19.0. 1. The economic stress were significant statistically to the higher, medium and low of gingival index (p<0.01). 2. The state-trait anxiety were significant statistically to the higher, medium and low of gingival index (p<0.001), of the pocket depth (p<0.05), of the clinical attachment loss (p<0.05). 3. The gingival index were investigate effect of the higher the economic stress ($\beta$=0.052, p<0.01), the higher the state-trait anxiety ($\beta$=0.052, p<0.01). As a result, this study suggests that the dental clinic institute needs to let the patients with the periodontal disease know about the effects of economic stress and state-trait anxiety. They also necessarily need to implement education program including stress management, economic stress, and state-trait anxiety improvement in order to prevent periodontal disease and to take charge.

• Proceedings of the Korea Water Resources Association Conference
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• 2021.06a
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• pp.115-115
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• 2021

식생은 증발산, 강우, 토양 수분 등 다양한 수문기상 요인과 밀접한 관계가 있기 때문에 식생의 상태는 가뭄 발생 시 물 부족에 매우 큰 영향을 받는다. 가뭄에 따른 식생의 변화와 영향을 파악하기 위해서는 식생-기후의 피드백을 이해해야 한다. 식생과 기후변수의 상호관계를 묘사하고 결합 확률을 구성하는 것은 식생-기후의 피드백을 이해하는데 적절하다. Copula 함수는 모든 변수를 연결하는 이점을 가지기 때문에 다양한 확률 변수를 결합하는 강력한 접근방법으로, copula를 통한 확률론적 접근방법은 수문 기상 스트레스에 대한 식생의 반응을 효과적으로 조사할 수 있다. 이에 따라 본 연구에서는 copula 기반의 식생-기후의 상호관계를 통해 가뭄 발생 시 식생이 받을 수 있는 영향을 정량화하고자 한다. 이를 위해 위성 자료를 활용한 식생건강성지수(Vegetation Health Index, VHI)와 위성관측된 강수 및 잠재증발산 자료를 적용하여 높은 공간 해상도에서 한국 전역의 식생 가뭄 가능성을 추정하고자 하였다. 강수 및 잠재증발산 자료를 통해 다양한 가뭄지수를 산정하고, copula 결합 이론을 기반으로 VHI와 가뭄지수 간의 이변량 결합 확률모델이 제안된다. 이에 조건부 확률을 적용하여 다양한 가뭄 시나리오에서 식생의 가뭄 가능성을 추정하고, 가뭄에 취약한 지역을 공간적으로 분석하고자 한다. 이를 통해 가뭄 스트레스에 따른 식생 변화와 생태학적 가뭄의 공간적 특성을 효과적으로 파악할 수 있을 것으로 기대된다.