• 한국환경과학회지
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• 제21권5호
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• pp.605-611
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• 2012

The purpose of this study is to analyze psychological and physiological effects accordance with viewing and walking in the forest and urban area. In the result of measurement of physiological reactions in nervous system, viewing of the forest had a calming effect on the nervous system by reducing blood pressure and heart rate. The other hand, viewing and walking in the urban area compared to the forest area raised stress by increasing blood pressure and heart rate. In addition, viewing in forest area was effective in stress relief by noticeable reduction of the amylase concentration. In contrast, walking in the urban area was also confirmed an increase of stress by increasing the concentration of the amylase. A viewing and walking in forest area was effective in alleviating depressed on anxiety, anger, fatigue and confusion.

• 한국환경과학회지
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• 제33권5호
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• pp.333-343
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• 2024

This study aimed to investigate whether inhaling the aroma of essential oils could alleviate physiological stress responses and mimic the effects of forest therapy in urban settings. Briefly, 31 participants underwent stress index assessments for two days and inhaled the selected plant essential oils. The effects of this treatment on physiological responses were determined through electroencephalogram (EEG) and heart rate variability (HRV) measurements taken before and after inhaling the aroma of essential oils, extracting results for low frequency (LF) and high frequency (HF) components of HRV, as well as 𝜃 and 𝛼 brainwave activities. The results indicated that lavender oil did not yield significant differences, whereas pine, chamomile, and cypress oils exhibited significant differences in effects. Overall, stress relief was associated with enhanced 𝜃 and 𝛼 brainwave activities, a decrease in the LF component and an increase in the HF component of HRV. Among the essential oils studied, pine oil was the most effective. These findings underscore the potential of plant essential oils in replicating the therapeutic benefits of forest therapy, even in urban environments. Further investigations into their utilization are warranted to better understand and harness their therapeutic potential.

• 스트레스연구
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• 제27권2호
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• pp.199-204
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• 2019

본 연구는 불안민감도가 과제수행과 스트레스 반응에 미치는 영향을 살펴보고, 이 과정에 우울감은 어떠한 영향을 미치는지 확인하였다. 참가자들은 제한된 시간에 암산 문제를 완수하였고, 불안민감도지수와 우울증 선별도구에 응답하였다. 더불어, 실험 전후 참가자들의 코르티졸(Cortisol) 변화량을 확인하였다. 그 결과, 불안민감도가 높은 사람은 과제수행의 정확도가 떨어지고 코르티졸 수치가 유의미하게 상승하였다. 또한, 불안민감도와 우울감이 모두 높은 참가자들이 코르티졸 수치가 가장 크게 상승하였다. 본 연구는 자기보고식 응답에 근거하여 임상증상을 기술하는 것을 넘어 과제수행의 정확도와 생화학적 지표를 함께 제시함으로써, 보다 안정적으로 개인의 불안민감도와 우울감의 관계를 논의하였다는 의의를 지닌다.

• 한국감성과학회:학술대회논문집
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• 한국감성과학회 1998년도 춘계학술발표 논문집
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• pp.171-175
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• 1998

This work presents an estimation for stress status using biosignal and fuzzy theory. Stress is estimated by 'coin-build' experiment with two type, relax and stress status. The estimator uses five biosignals, fuzzy logic to combine these signals and physiological knowledge. The system was tested in 10 records of healthy indivisuals and acheived a template of a stress progress. This work presents an estimation for stress status using biosignal and fuzzy theory. Stress is estimated by 'coin-build' experiment with two type, relax and stress status. The estimator uses five biosignals, fuzzy logic to combine these signals and physiological knowledge. The system was tested in 10 records of healthy indivisuals and acheived a template of a stress progress.

• BMB Reports
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• 제55권12호
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• pp.577-586
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• 2022

Stress granules (SGs) are stress-induced subcellular compartments, which carry out a particular function to cope with stress. These granules protect cells from stress-related damage and cell death through dynamic sequestration of numerous ribonucleoproteins (RNPs) and signaling proteins, thereby promoting cell survival under both physiological and pathological condition. During tumorigenesis, cancer cells are repeatedly exposed to diverse stress stimuli from the tumor microenvironment, and the dynamics of SGs is often modulated due to the alteration of gene expression patterns in cancer cells, leading to tumor progression as well as resistance to anticancer treatment. In this mini review, we provide a brief discussion about our current understanding of the fundamental roles of SGs during physiological stress and the effect of dysregulated SGs on cancer cell fitness and cancer therapy.

• 감성과학
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• 제2권2호
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• pp.37-42
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• 1999

Long-term exposure to loud noise affects performance since it changes arousal level, distracts attention, and also is able to evoke subjective stress accompanied by negative emotional states. The purpose of the study was to analyze dynamics of subjective and physiological variables during a relatively long-lasting (30 min) exposure to white noise (85 dB[A]). Physiological signals were recorded on 15 college students during 30 min of intense auditory stimulation. Autonomic variables, namely skin conductance level , non-specific SCR number, inter-best intervals in ECG, heart rate variability index (HF/LF ratio of HRV), skin temperature, as well as respiration rate were analyzed on 5 min epoch basis. Psychological assessment (subjective rating of stress level) was also repeated every 5 min. Statistical analysis was employed to trace the time course of the dynamics of subjective and autonomic physiological variables and their relationships. Results showed that the intense noise evoked subjective stress as well as associated autonomic nervous system responses. However it was shown that physiological variables endured specific changes in the process of exposure to the loud white noise. Discussed were probable psychophysiological mechanisms mediating reactivity to long-term auditory stimulation of high intensity, namely short-term activation, followed by transient adaptation (with relatively stable autonomic balance) and then a subsequent wave of arousal due to tonic sympathetic dominance.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1995년도 춘계학술대회
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• pp.113-116
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• 1995

Steady and physiological flows of a Newtonian fluid and blood in the bifurcated arterial vessel are numerically simulated. Distributions of velocity, pressure and wall shear stress in the bifurcated arterial vessel are calculated to investigate the differences between steady and physiological flows. For the given Reynolds number physiological flow characteristics of a Newtonian fluid and blood in the bifurcated arterial vessel are quite different from those of steady flows. No flow separation or flow reversal in the bifurcated region in the downstream after stenosis appears during the acceleration phase. Also, no recirculation region is seen for steady flows. However, during the deceleration phase the flow began to exhibit flow reversal, which is eventually extended to the entire wall region.

• ETRI Journal
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• 제45권1호
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• pp.105-118
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• 2023

We tested the feasibility of automated discrimination of patients with panic disorder (PD) from healthy controls (HCs) based on multimodal physiological responses using machine learning. Electrocardiogram (ECG), electrodermal activity (EDA), respiration (RESP), and peripheral temperature (PT) of the participants were measured during three experimental phases: rest, stress, and recovery. Eleven physiological features were extracted from each phase and used as input data. Logistic regression (LoR), k-nearest neighbor (KNN), support vector machine (SVM), random forest (RF), and multilayer perceptron (MLP) algorithms were implemented with nested cross-validation. Linear regression analysis showed that ECG and PT features obtained in the stress and recovery phases were significant predictors of PD. We achieved the highest accuracy (75.61%) with MLP using all 33 features. With the exception of MLP, applying the significant predictors led to a higher accuracy than using 24 ECG features. These results suggest that combining multimodal physiological signals measured during various states of autonomic arousal has the potential to differentiate patients with PD from HCs.

• 대한안전경영과학회지
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• 제13권1호
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• pp.75-80
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• 2011

This paper reviewed the relationship between superior leadership and job stress responses, and the moderating effect of age in maintenance area of air force. Based on the responses from 450 air force maintenance persons, the results of multiple regression analysis showed that transactional leadership has negative relationship with physiological stress response, charisma has negative relationship with psychological stress, and individual consideration has negative relationship with behavioral stress. In moderating effects, age has negative effect on the relationship between transactional leadership and physiological stress response, and age has positive effect on the relationship between charisma and psychological stress response.

• 한국응급구조학회지
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• 제11권3호
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• pp.5-15
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• 2007

The purpose of this study was to identity the distribution of post-traumatic stress types and coping methods and to find the relationship between the post-traumatic stress types and the coping methods, for firefighters who experienced in Dea-Gu Subway Fire Disaster. The Subjects of this study were 126 firefighters who experienced Deagu Subway Disaster. Q questionnaire developed by Q-study and coping methods instrument based on that of Folkman & Lazaruswas revised and complemented by Kim Jung Hee was used. Data were analyzed by t-test, ANOVA using SPSS. The results of this study were as follows : 1. The distribution of post-traumatic stress types were 52.4% of Emotional arousal trauma, 34.1% of Trauma experience persistence and 13.5% of Physiological symptom experience. 2. The difference of post-traumatic stress types according to the general characteristics were significantly related to the physical injury(p = .010). 3. The minimum score of coping with post-traumatic stress types was 0.07, the maximum was 2.96 and the mean score was 1.27. 4. The coping methods according to the general characteristics were significantly different at active coping method according to educational level(p = .001), passive coping method according to educational level(p = .003) and passive coping method according to diagnosis(p = 0.20). 5. The mean score of active coping method according types were Emotional arousal trauma(1.505), trauma experience persistance(1.322) and Physiological symptom experience(1.276). The mean score of passive coping method related with types were Emotional arousal trauma(1.328), trauma experience persistance(1.254) and Physiological symptom experience(1.219).