• Journal of Bio-Environment Control
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• v.28 no.4
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• pp.461-470
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• 2019

This study was carried out to quantify the drought stress in grafted watermelon seedlings non-destructively by using chlorophyll fluorescence (CF) imaging technique rather than the visual judgment. Six-day old watermelon seedlings were grown under uniform irrigation for 3 days, and then given drought stress. Afterward, the sensor for the measurement of water content in plug tray cell unit was used to classify the drought-stress level into nine groups from D1 (53.0%, sufficient moisture state) to D9 (15.7%, extremely dry stress), and the 16 CF parameters were measured. In addition, re-irrigation was performed on the drought stressed seedlings(D5 - D9) to determine the growth and photosynthesis recovery level, which was not confirmed by visual judgment. The kinetic curve patterns of CF in three different drought stressed seedling groups were found to be different for the early detection of drought stress. All the 16 CF parameters decreased continuously with exposure to drought stress and drastically decreased from D5 (32.1%) where the visual judgment was possible. The fluorescence decline ratio (Rfd_Lss) started to decrease from the initial drought stress level (D5 - D6), and the Maximum PSII quantum yield (Fv/Fm) was significantly decreased in the later extreme drought stress range (D7 - D9) by re-irrigation recovery test. Thus, Rfd_Lss and Fv/Fm parameters were finally selected as potent indicators of growth and photosynthesis recovery in the initial and later stages of drought stress. Also, to the differences in the numerical values of the individual chlorophyll fluorescence parameters, the drought stress level was intuitively confirmed through the image. These results indicate that Rfd and Fv/Fm can be considered as potential CF parameters for the detection of low and extremely high drought stress, respectively. Furthermore, Fv/Fm can be considered as the best CF parameters for recovery at re-irrigation.

• Journal of Korean Medicine Rehabilitation
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• v.18 no.2
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• pp.143-156
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• 2008

목적 : 갱년기 여성은 내장비만의 위험이 높으며 또한 심리적 변화를 겪는 시기이다. 갱년기 여성의 복부지방, 내장지방, 피하지방 및 이와 관련된 단순비만지표, 간울증, 스트레스, 우울, 자존감 등을 조사하여 갱년기 건강의 위협이 되는 신체 심리 인자를 알아보고자 이 연구를 시행하였다. 방법 : 병원공고를 통해 체질량지수 $23kg/m^2$ 이상 비흡연자인 만 45세 이상 55세 이하의 폐경 전후의 갱년기 여성 환자를 모집하여 2007년 8월 20일부터 24일까지 47명이 모집되었으며 이중 체질량지수 $25kg/m^2$ 이상이면서 복부 전산화 단층촬영 상 내장지방이 $100cm^2$ 이상인 20명의 단순비만지표, 체성분검사, 혈액검사, 복부 전산화 단층촬영 및 한방비만변증 (간울) 및 스트레스, 우울, 자존감 설문검사 결과의 상관성을 분석하였다. 본 연구는 경희대학교 동서신의학병원의 임상연구심사위원회의 승인을 받았다. 결과 : 1. 갱년기 비만여성에서 복부지방 면적, 피하지방 면적은 체질량지수, 체지방률, 허리둘레/신장비 등의 단순비만지표와 유의한 상관성을 보인 반면 (p < 0.01), 내장지방 면적은 단순비만지표와 상관성을 보이지 않았다. 2. 내장지방 면적은 사회 재적응 평가척도 (${\gamma}=0.577$, p < 0.01)와 유의한 상관성이 있었고, 선형회귀분석에서 유의한 결과를 나타냈다. $VAT(cm^2)=116.1+0.101{\times}(SRRS\;score)$ (${\gamma}^2=0.332$) 3. 피하지방은 식이태도 점수와, 총복부지방은 식이태도 점수 및 갱년기지수 중 혈관운동증상과 상관성이 있었다. 4. 간울증은 스트레스 반응척도, 우울지수, 갱년기지수 및 그 하부항목 중 혈관운동, 정신, 운동, 소화, 전신증상과 양의 상관성을, 자존감척도와는 음의 상관성을 나타냈으며, 내장지방과 직접적인 상관성을 보이지 않았다. 결론 : 간울증은 높은 스트레스, 우울, 갱년기 증상 및 낮은 자존감과 관련되는 것으로 나타났다. 폐경전후 비만여성에서 내장지방 면적은 간울증과 유의한 상관성을 보이지 않았으나, 생활 스트레스 사건이 많을수록 높아지는 것으로 나타나 갱년기 여성 내장비만에서 스트레스에 대한 대처가 중요할 것으로 사료된다. 추후 임상적 연계성 및 설문 보완에 대한 연구가 필요하리라 생각된다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.4
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• pp.312-318
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• 2016

This study examined the influence of a Mindfulness Based Compassion Meditation Program on the brain activation and stress of elderly women who experienced loss of spouse using 2 channel EEG (Electroencephalography). The total number of subjects was 60, consisting of elderly women aged from 65~75years of in Y county; 30 in the experimental group and 30 in the control group who were checked by EEG before and after the study. The study was conducted from August to November, 2015. The Mindfulness Based Compassion Meditation Program was designed for the convergence of body and mind integration with compassion meditation for the purpose of developing love, sympathy, and compassion. The treatment was conducted once a week, for 60 minutes at a time, over a period of 16 weeks. The results in the experimental group showed an increase in the Activity Quotient (ATQ) Rt(82.51/85.83, p<.013) and AntiStress Quotient (ASQ) Lt (74.711/71.17, p<.050). The Activity Quotient shows the mental function and behavior tendency in the brain, while the AntiStress Quotient shows the state of physical and mental relaxation. The Mindfulness Based Compassion Meditation Program was shown to influence the brain activation and stress of the elderly women using the practical application of neuroscience.

• Proceedings of the KAIS Fall Conference
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• 2009.12a
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• pp.546-549
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• 2009

본 연구는 2008년 1월부터 2008년 12월까지 S 유치원 원아40명(실험군 20명, 대조군 20명)의 뇌파를 검사하여 뉴로피드백 훈련 전과 훈련 후의 스트레스 저항 능력을 보고자 하였다. 훈련 전과 후의 스트레스 저항 능력은 시계열 선형분석을 통하여 비교하였으며, 연구의 결과로 뉴로피드백 훈련을 적용한 집단에서 항 스트레스 지수에서 유의미한 차이를 보였다. 이 결과는 뉴로피드백 훈련이 유아들의 스트레스 저항 능력을 높여 주었으며 정서적 성향에 긍정적인 영향을 미쳤다고 본다.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.14 no.3
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• pp.215-222
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• 2021

As the importance of human-computer interaction (Human Computer Interface) technology grows and research on HCI is progressing, it is inferred about the research emotion inference or the computer reaction according to the user's intention, not the computer reaction by the standard input of the user. Stress is an unavoidable result of modern human civilization, and it is a complex phenomenon, and depending on whether or not there is control, human activity ability can be seriously changed. In this paper, we propose an intelligent emotional recommendation system using music as a way to relieve stress after measuring heart rate variability (HRV) and acceleration photoplethymogram (APG) increased through stress as part of human-computer interaction. The differential evolution algorithm was used to extract reliable data by acquiring and recognizing the user's biometric information, that is, the stress index, and emotional inference was made through the semantic web based on the obtained stress index step by step. In addition, by searching and recommending a music list that matches the stress index and changes in emotion, an emotional recommendation system suitable for the user's biometric information was implemented as an application.

• Korean Journal of Culture and Social Issue
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• v.17 no.3
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• pp.305-320
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• 2011

The objectives of the present research are twofold. First, this research aims to compare the effect of trait characteristics(sensation seeking, social resistance and type-A behavior) with that of driving specific characteristics(driving anger and type-A driving) on problematic driving behavior. Second, the role of life stress as a mediator in the relationships between general trait characteristics and traffic safety index was examined. 1158 licensed commercial vehicle drivers were surveyed and their accident-related records were obtained in this research. Results showed that driving specific characteristics were significant indicators of traffic safety and life stress mediated the relationships between general trait characteristics and traffic safety index. These findings implicate that understanding drivers' driving specific characteristics and their levels of life stress is important to reduce problematic driving behaviors and enhance traffic safety.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.16 no.3
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• pp.103-108
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• 2016

In daily life, humans get stress very often. Stress is one of the important factors of healthy life and closely related to the quality of life. Too much stress is known to cause hormone imbalance of our body, and it is observed by the brain and bio signals. Based on this, the relationship between brain signal and stress is explored, and brain signal based stress index is proposed in our work. In this study, an EEG measurement device with 32 channels is adopted. However, only two channels (FP1, FP2) are used to this study considering the applicability of the proposed method in real enveironment, and to compare it with the commercial 2 channel EEG device. Frequency domain features are power of each frequency bands, subtraction, addition, or division by each frequency bands. Features in time domain are hurst exponent, correlation dimension, lyapunov exponent, etc. Total 6 subjects are participated in this experiment with English sentence reading task given. Among several candidate features, ${\frac{{\theta}\;power}{mid\;{\beta}\;power}}$ shows the best test performance (70.8%). For future work, we will confirm the results is consistent in low price EEG device.

• The Journal of the Convergence on Culture Technology
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• v.7 no.1
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• pp.576-581
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• 2021

In the post-epidemic era, COVID-19 has not yet been fully controlled. Wearing masks is still the main means of epidemic prevention, and the negative effects brought by masks continue to continue. Wearing a mask for a long time can cause two problems. The first problem is hypoxia, and the other is an increase in psychological stress. To reduce the negative impact of masks, this paper proposes a new breathing mode. It is the "Umm~" vocal breathing mode, which simultaneously solves the two problems of hypoxia and increased stress. This paper explores the reasons why new breathing patterns can relieve stress. Explains the relationship between HRV and stress index and uses SDNN as an indicator to detect stress index to confirm the effectiveness of this breathing pattern. Experimental results prove that the "Umm~" vocal breathing mode can not only relieve the stress induced by wearing a mask. And when not wearing a mask, it can also be used to relieve daily stress. This method that anyone can easily implement should be more popularized.

• Proceedings of the Korea Water Resources Association Conference
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• 2021.06a
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• pp.72-72
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• 2021

가뭄은 수개월, 수년 이상에 걸쳐 서서히 발생 및 지속되며, 식생에 대한 피해가 발생할 때까지 확실한 인식이 어렵다. 최근에는 기후변화로 인하여 가뭄의 발생빈도가 증가하고 있으며, 기상 이상에 따른 다양한 형태의 가뭄이 발생하고 있다. 미국에서 정의한 'Flash Drought'는 비교적 짧은 기간 동안 표면온도의 상승과 비정상적으로 낮고 빠르게 감소하는 토양수분으로 인하여 식생에 대한 극심한 스트레스를 유발하면서 광범위한 작물 손실 및 용수공급 감소 등에 대한 피해를 야기하는 가뭄이다. 국내에서는 Flash Drought에 대한 모니터링이 활성화되지 않았기 때문에 본 연구에서는 '돌발가뭄'이라는 새로운 정의를 제시하면서 토양수분, 증발산량, 강수량, 기온 등의 가뭄 관련 주요인자를 활용하여 국내에서 발생한 돌발가뭄 (Flash Drought)를 감지하고 분석하고자 하였다. 돌발가뭄을 분석하기 위하여 선행연구에서 제시한 가뭄 관련 주요인자 기준 유형, 증발산량 기반 가뭄지수를 활용한 유형 등을 활용하였으며, 지상관측자료로는 국내 76개 종관기상관측 자료를 활용하였다. 또한, 토양수분 자료는 GRACE (Gravity Recovery and Climate Experiment) 위성영상 자료를 취득한 후 5 km 공간해상도 자료로 활용하였다. 가뭄지수의 경우 증발산 기반 가뭄지수 중 표준강수증발산지수 SPEI (Standardized Precipitation Evapotranspiration), 증발스트레스지수 ESI (Evaporative Stress Index) 등을 활용하여 국내 돌발가뭄 유형에 대한 분석에 적용하였다. 본 연구를 통하여 아직 명확하게 정의되지 않은 돌발가뭄에 대한 유형별 분석 및 국내 돌발가뭄의 수문기상학적 특성을 분석하고자 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.7
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• pp.4184-4190
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• 2014

The present paper examined the stress and ADL (activities of daily living) index in relation to the characteristics of the elderly in nursing homes. For this study, questionnaires were given to 110 seniors in the N-district of Seoul, and S-myeon, Hoengseong-gun, Gangwon Province from May 1 to September 30, 2013. For data analysis, t-test, correlation analysis, and multiple regression analysis were performed using the SPSSWIN18.0 program. The analysis of actual proof was made at a significance level of 5 percent. The findings from the analyses were as follows: first, the relocation syndrome into nursing homes has a positive correlation with the stress of deficient family visits in the category of daily stresses; second, depression has a positive correlation with the stresses of deficient private time and space and deficient family visits in the category of daily stresses; third, weight control has a positive correlation only with the stress of deficient private time and space in the category of daily stresses, whereas a nutrition deficiency has positive correlation with the stress of deficient family visits in the category of daily stresses. These findings may serve as ground source data for establishing policies regarding the stresses in relation to the characteristics and ADL index of the elderly in nursing homes.