• 한국콘텐츠학회논문지
• /
• 제12권2호
• /
• pp.1-9
• /
• 2012

본 논문은 가중 퍼지소속함수 기반 신경망 (Neural Network with Weighted Fuzzy Membership functions, NEWFM)과 심박수 변이도(Heart Rate Variability, HRV)를 이용하여 우울증 진단알고리즘을 제안하고 있다. 본 알고리즘에서 사용할 NEWFM의 입력특징을 추출하기 위해서 주파수도메인 특징추출, 시간도메인 특징추출, 웨이블릿변환 특징추출, 포인케어변환 특징추출 방법을 이용하여 22개의 초기 HRV 특징들을 추출하였다. 또한 NEWFM에서 제공하는 비중복면적 분산측정법 (Non-overlap Area Distribution Measurement, NADM)에 의해 입력특징의 중요도를 평가하여 22개의 초기특징으로부터 중요도가 가장 높은 6개 최적입력특징을 선택하였다. 이 6개 특징을 이용하여 우울증을 진단한 결과는 95.8% 의 정확도를 나타내었다.

• 대한인간공학회지
• /
• 제2권2호
• /
• pp.3-10
• /
• 1983

While three subjects were running on treadmill at five different speeds, their heart beat interval times were measured and analyzed. From the analysis, we discovered some relation- ships between workload and cardiac response, especially cardiac arrhythmia. Using these relationships, a physioligical model for estimating workload was developed. Although pulse rate has been considered as a good measure of physical load, this study shows that it is highly subject dependent and therefore unsuitable for task evalution. It is recommended to use range of heart beat interval times rather than pulse rate in the evaluation of light work.

• 한국감성과학회:학술대회논문집
• /
• 한국감성과학회 2004년도 추계학술대회 논문집
• /
• pp.29-29
• /
• 2004

• 동의신경정신과학회지
• /
• 제17권2호
• /
• pp.133-145
• /
• 2006

Objective : The purpose of this experimental-controlled study was to investigate the characteristics of the autonomic nervous system in students with Keongke by using HRV(Heart rate variability) and PSV(Pupil size variability). Method : The study group was consisted of 11 students with self recognition as the experimental group, and 25 normal students as the control group. Informations on gender and age were obtained by medical charts and personal interviews. By using heart rate variability and pupil size variability, we measured the value of HRT(Heart rate), SDNN(Standard deviation of NN intervals), LFnorm(Low frequency normalization), HFnorm(High frequency normalization), LF/HF ratio, Pupil area, B.S.(Basic size), C.R.(Max Constriction Rate) and 1s.d.(1sec Dilation Rate). I compared the degrees of the sympathetic and parasympathetic activity. Result : 1. In the result of heart rate variability between experimental and control group, none of the parameters of experimental group were significantly different from control group. And even though there were no statistical significance, there were some numerical differences in SDNN, LF norm, HF norm. 2. In pupil size variability, C.R. and 1s.d. of the experimental group were increased compared to control group. Conclusion : The study results suggest that the group with Keongke has differences of autonomic nervous system as compared to those in normal state. Measurement value of PSV is a new technical approach to estimate the autonomic nervous system.

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

• ETRI Journal
• /
• 제43권5호
• /
• pp.881-890
• /
• 2021

Photoplethysmography (PPG) is a noninvasive technique that can be used to conveniently measure heart rate (HR) and thus obtain relevant health-related information. However, developing an automated PPG system is difficult, because its waveforms are susceptible to motion artifacts and between-patient variation, making its interpretation difficult. We use deep neural network (DNN) filters to mimic the cognitive ability of a human expert who can distinguish the features of PPG altered by noise from various sources. Systolic (S), onset (O), and first derivative peaks (W) are recognized by three different DNN filters. In addition, the boundaries of uninformative regions caused by artifacts are identified by two different filters. The algorithm reliably derives the HR and presents recognition scores for the S, O, and W peaks and artifacts with only a 0.7-s delay. In the evaluation using data from 11 patients obtained from PhysioNet, the algorithm yields 8643 (86.12%) reliable HR measurements from a total of 10 036 heartbeats, including some with uninformative data resulting from arrhythmias and artifacts.

• 스트레스연구
• /
• 제26권4호
• /
• pp.305-311
• /
• 2018

화병은 뚜렷한 스트레스 사건과 관련되어 가슴의 답답함, 열감, 치밀어 오름, 억울하고 분한 감정 등이 나타나는 증후군이다. 본 논문에서는 화병에 대한 황련해독탕의 임상시험 결과를 교감신경의 활성도를 반영한다고 알려져 있는 심박변이도의 저주파(0.04~0.15 Hz) 영역 값을 중심으로 분석하여 다음과 같은 결과를 얻었다. 첫째, 황련해독탕 시험군에서 초기 심박변이도 저주파 값이 클수록 불면 증상의 개선 정도가 작게 나타났다. 둘째, 위약과 비교했을 때, 황련해독탕은 복용 7일 후 심박변이도 저주파 값을 유의하게 감소시켰다. 셋째, 화병 증상 중 가슴이 답답함, 치밀어 오름, 분노가 심박변이도 저주파 값과 유의미한 상관성이 있었다. 이를 바탕으로 심박변이도는 화병 환자를 평가할 때 유용할 것이라고 기대된다.

• 부모자녀건강학회지
• /
• 제8권2호
• /
• pp.157-167
• /
• 2005

The purpose for this study is to identify the effects of nonnutritive sucking and facilitated tucking as a pain management during painful heelstick procedure. This study was a repeated measurement design. Data were collected from Sep. 15, to Oct. 20, 2005. According to the criteria twenty seven high risk infants were selected from the NICU of university hospital. The behavioral state were evaluated with the PIPP(Prematures Infants Pain Profile. PIPP, heart rate, saturation were observed without versus with nonnutritive sucking and tucking care. Statistic analysis was conducted with a wilcoxon nonparametric test. The results of this study were as follows. Pina behavior responses in nonnutritive sucking and tucking cases were lower than without treatment(Z=-4.430, p=.000), Heart rate and heart rate recovery time in nonnutritive sucking and tucking cases were attenuate decrease in heart rate(Z=-2.694, p=.005) and statistical significant differences in periods (Z=-4.229, p=.000). But, Saturation was no significant differences(Z=-3.230, p=.000). In conclusion, the application of nonnutritive sucking and tucking as an pain relieg for high risk infants is nursing intervention in pain management ar heelsticks.

• Journal of Korean Biological Nursing Science
• /
• 제14권4호
• /
• pp.249-257
• /
• 2012

Purpose: The purpose of this study was to examine the effects of phytoncide aromatherapy on stress, symptoms of stress and heart rate variability among nursing students. Methods: This study is a randomized control-group non-synchronized design. The experimental group (n=31) underwent phytoncide aromatherapy for 2 weeks, while the control group (n=31) received placebo therapy. The data were collected using self-administration questionnaires and measurement of heart rate variability (HRV) and analyzed using SPSS WIN 18.0 program. A p value <.05 was considered statistically significant. Results: Total score of stress, individual score of intrapersonal stress, and score of peripheral manifestations in symptoms of stress in the experimental group were significantly lower than those of the control group. All indices of HRV were significantly different between the two groups. LF norm and LF/HF ratio in the experimental group were significantly lower than those of the control group, and HF norm in the experimental group was significantly higher than that of in the control group. Conclusion: Based on these results, it can be suggested that phytoncide aromatherapy was effective in decreasing stress and peripheral manifestations of stress and changing in HRV among nursing students.

• 대한한방내과학회지
• /
• 제33권2호
• /
• pp.209-221
• /
• 2012

Objectives : The aim of this study was to investigate the relationship between the autonomic nervous system and the cold-heat pattern in patients with chronic constipation. Methods : Subjects with chronic constipation (n=30) and without chronic constipation (n=20) were recruited, interviewed and measured for heart rate variability (HRV). Chronic constipation was defined as functional constipation and Irritable Bowel Syndrome (IBS) with constipation based on Rome III criteria. We surveyed patients' general characteristics, categorized by cold-heat pattern, and took measurement of HRV for 5 minutes. Analysis was conducted among these three indices. Results : Women accounted for most of the subjects with chronic constipation (96.7%). In groups with or without constipation, the number of cold patterns was more than of heat patterns. The mean heart rate of subjects without chronic constipation was significantly higher than that of subjects with chronic constipation. No other statistical significance was noted among indices of HRV and cold-heat pattern. Conclusions : Through this study, there were few relationships between autonomic nervous system measured by HRV and cold-heat pattern in chronic constipation.