• Title, Summary, Keyword: arousal

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Evaluation of arousal level by EDA and fuzzy inference (피부전기 활동과 fuzzy추론에 의한 각성도의 평가)

  • Kim, Yeon-Ho;Ko, Han-Woo;Yoo, Jun
    • 제어로봇시스템학회:학술대회논문집
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    • pp.1856-1859
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    • 1997
  • This paper describes the arousal measurement and the control system using fuzzy logic to prevent drowsy driving. Sugeno's method was used for fuzzy inference in this study. Membership function and rule base were determined form the modfied arousal level criteria. The output of fuzzy inference tracked well the change of subject's arousal level. When IRI(Inter-SIR interval) was under the 60sec, maximum output of three step warning method was medium sound, but that of fuzzy logic system was changed from medium to big. Furthermore, the output of the fuzzy inference was highly correlated with $N_{z}$(r=0.99). Therefore, the fuzzy inference method for evaluation and the control of arousal will be more effective at real driving sityation than three step warning method.ning method.

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Arousal and Valence Classification Model Based on Long Short-Term Memory and DEAP Data for Mental Healthcare Management

  • Choi, Eun Jeong;Kim, Dong Keun
    • Healthcare Informatics Research
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    • v.24 no.4
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    • pp.309-316
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    • 2018
  • Objectives: Both the valence and arousal components of affect are important considerations when managing mental healthcare because they are associated with affective and physiological responses. Research on arousal and valence analysis, which uses images, texts, and physiological signals that employ deep learning, is actively underway; research investigating how to improve the recognition rate is needed. The goal of this research was to design a deep learning framework and model to classify arousal and valence, indicating positive and negative degrees of emotion as high or low. Methods: The proposed arousal and valence classification model to analyze the affective state was tested using data from 40 channels provided by a dataset for emotion analysis using electrocardiography (EEG), physiological, and video signals (the DEAP dataset). Experiments were based on 10 selected featured central and peripheral nervous system data points, using long short-term memory (LSTM) as a deep learning method. Results: The arousal and valence were classified and visualized on a two-dimensional coordinate plane. Profiles were designed depending on the number of hidden layers, nodes, and hyperparameters according to the error rate. The experimental results show an arousal and valence classification model accuracy of 74.65 and 78%, respectively. The proposed model performed better than previous other models. Conclusions: The proposed model appears to be effective in analyzing arousal and valence; specifically, it is expected that affective analysis using physiological signals based on LSTM will be possible without manual feature extraction. In a future study, the classification model will be adopted in mental healthcare management systems.

Effect on Physiological Responses According to Different Arousals (각성의 유형이 생리반응에 미치는 영향)

  • 황민철;임좌상;김혜진;김세영
    • Science of Emotion and Sensibility
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    • v.4 no.2
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    • pp.89-93
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    • 2001
  • Human arousal represents one of human emotion dimension. Its effort on human performance has been generally accepted at a invert-cup trend. h optimal range of human arousal enhances human performance However, definition of arousal is not Vet clear. Human arousal has different types depending on the causes. This paper observes different reponses based on different arousals such as cognitive arousal and physical arousal. Twenty undergraduate students participated and experienced cognitive and physical arousals. Their physiological response were analyzed and differentiated between cognitive and physical arousal. Finally, significant difference between them are not shown in autonomic responses but in central nervous responses.

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A study on compensation of arousal level criteria (각성도 평가기준 보상법에 대한 연구)

  • Ko, H.W.;Kim, Y.H.;Lee, G.K.
    • Proceedings of the KOSOMBE Conference
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    • v.1996 no.11
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    • pp.86-89
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    • 1996
  • This paper describes compensation method to evaluate arousal level in different initial arousal state. Arousal level was measured by the relationship between IRI and Nz. The value of Nz is affected by BI which is variable with initial drowsiness. we introduced a correction factor to compensate these differences.

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Comparison and The Evaluation of Criteria for Arousal Level Control (SIC에 의한 각성도 제어를 위한 평가기준의 설정 및 비교)

  • Ko, H.W.;Kim, Y.H.
    • Proceedings of the KOSOMBE Conference
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    • v.1996 no.11
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    • pp.372-376
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    • 1996
  • This paper describes the criterias to evaluate arousal states of subject and these are applied to contort arousal level. Correction factor was introdued to compensate under or over evaluated Nz due to the different initial basal skin impedance. These criteria and correction factor were worked well to increase the arousal level.

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Evaluation of Arousal Level to Prevent Drowsy Driving by Fuzzy Inference (졸음운전 방지를 위한 fuzzy 추론에 의한 각성도의 평가)

  • Kim, Y. H.;Ko, H. W.;Lyou, J.
    • Journal of Biomedical Engineering Research
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    • v.18 no.4
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    • pp.491-498
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    • 1997
  • This paper describes the arousal measurement and control system using fuzzy logic to prevent drowsy driving. Sugeno's method was used for fuzzy inference in this study. Arousal evaluation and control criteria were modified from result of Nz-IRI analysis depending on arousal sate. Membership function and rule base of fuzzy inference were determined from the modified arousal level criteria When lRl (Inter-SIR Interval) was shorter than 60sec, outputs of both methods were changed from small to big, but output of three step warning method was same level until the next warning range. Since output of fuzzy inference tracked well the change of subject's arousal level, problems of three step warning method could be overcome by fuzzy inference method Furthermore, the output of the fuzzy inference was highly correlated with Nz(r = 0.99). Therefore, the fuzzy inference method for evaluation and the control of arousal will be more effective at real driving situation than three step warning method.

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A Study on Evaluation of Human Arousal Level using PPG Analysis (PPG(Photoplethysmography)분석을 이용한 각성도 평가에 관한 연구)

  • Kim, Chi-Jung;Whang, Min-Cheol;Kim, Jong-Hwa;Woo, Jin-Cheol;Kim, Yong-Woo;Kim, Ji-Hye
    • Journal of the Ergonomics Society of Korea
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    • v.29 no.1
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    • pp.113-120
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    • 2010
  • This research is to evaluate the arousal level by using cardiovascular response. PPG was used in this study as one of the method of measuring it rather than ECG (Electrocardiography) for the purpose of solving ergonomic problem of sensing. The participants were in the age group of 20 (mean=24, standard deviation=1.25): five men and five women. Each experiment composed with four identical sets. First, a black screen was displayed for 30 second rest. Then, the prepared 6 pair images were randomly presented for 10 second stimulation and for 30 second non-stimulation. PPG was measured on the earlobes of experimenters at 200Hz sampling frequency. PPG amplitude, PPI(Pulse to Pulse Interval), and PRV(Pulse Rate Variability) were analyzed according to arousal level. T-test was performed to compare between the PPG variables of rest and relaxation, rest and arousal, and relaxation and arousal. Relative to the rest state, PPG amplitude decreased in relaxed state and increased in aroused state. Relative to the rest state, PPI decreased in both emotional states. However, more significant decline was observed in aroused state. PRV's LF and HF were used in the form of LF/HF to compare between the relaxed and the aroused state. Therefore, PPG signal showed significant differences between relaxed and aroused state. In conclusion, evaluation of human arousal level used in the PPG analysis demonstrated that PPG has better usability and comforter measurement than ECG and is clearly an alternative method of measuring arousal level.

A Study Concerning Analysis of Arousal State of locomotive Engineering During Operating Train (열차 운행 중인 기관사의 각성상태 분석에 관한 연구)

  • Yang, Heui-Kyung;Lee, Jeong-Whan;Lee, Young-Jae;Lee, Jae-Ho;Lim, Min-Gyu;Baek, Jong-Hyen;Song, Yong-Soo
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.6
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    • pp.891-898
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    • 2012
  • The study for the passenger's comfortableness of vehicles and the arousal of car drivers has been done widely. On the other hand, there are few studies for the locomotive engineers. Human error means that the mistakes made by human, recently it receives attention in the field of safety engineering and human engineering. Comparing the operating condition of train with car, because of the simplification of the visual stimulus, the arousal level on the train goes down easily. The arousal level down makes judgement down, the accident risk from human error is getting bigger. In this study, we measured bio-signals(ECG, EDA, PPG, respiration and EEG) from 6 locomotive engineers to evaluate their arousal state while they operated the train. Also we recorded the 3 axes acceleration signal showing the vibration state of train. Also, the existence of tunnels were simultaneously measured. At the station section where the train speed goes down, the size of vector's sum decreases because of reduced vibration. Beta component in EEG tends to increase at the entering point of each station and tunnel. It is due to the arousal reaction and tension growth. The mean SCR(skin conductance response) was more increased in neutral section. As the button control movement (body movement) increases in the neutral section, it is appeared that SCR increase. RR interval tends to gradually increase during train operation for 1 hour 40 minutes. However, It tends to sharply decrease at the stop station because strong concentration needed to stop train on the exact point. The engineer's arousal reaction can be checked through analysing the bio-signal change during train operation. Therefore, if this analysing result is adopted to the sleepiness prevention caution system, it will be useful for the safety train operation.

Arousal Inhibitory Effect of Phlorotannins on Caffeine in Pentobarbital-Induced Mice

  • Cho, Suengmok;Yang, Hyejin;Yoon, Minseok;Kim, Jiyoung;Kim, Dongsoo;Kim, Jinkyung;Kim, Seon-Bong
    • Fisheries and aquatic sciences
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    • v.17 no.1
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    • pp.13-18
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    • 2014
  • Sleep is vital to maintain health and well-being; however, insomnia is currently a widespread health complaint worldwide. In particular, caffeine, a psychoactive component of coffee, tea, and caffeine beverages may lead to sleep disorders such as insomnia. In this study, our primary objective was to investigate the inhibitory effect of high-purity phlorotannin preparation (HP-PRT) on caffeine-induced wakefulness. The sleep test of pentobarbital-induced mice was used as an in vivo animal model. Caffeine (50 and 100 mg/kg) showed significant arousal effects (an increase in sleep latency and a decrease in sleep duration). Co-administration of caffeine (50 mg/kg) and the sedative-hypnotic diazepam (DZP, 1 mg/kg) did not result in similar arousal activity. HP-PRT (500 mg/kg) also inhibited caffeine-induced wakefulness. Our results suggest that HP-PRT would be a useful additive for developing coffee products without the arousal effect.

The Literature Review on the Relation between the Modulation of Arousal and the Suck/Swallow/Breathe(SSB) Synchrony (각성조절과 빨기/삼키기/숨쉬기의 조화(Suck/Swallow/Breathe Synchrony)와의 연관성에 관한 고찰)

  • Kim, In-Sun;Lee, Ji-Young;Hwang, Jee-Young
    • The Journal of Korean Academy of Sensory Integration
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    • v.1 no.1
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    • pp.61-72
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    • 2003
  • The suck/swallow/breathe(SSB) synchrony, serving as the earlist primary motor mechanism, is the rhythmical, coordinated pattern of sucking, swallowing and breathing. The development of an intact SSB is an important precursor for further sensorimotor and cognitive development including speech and language development, state regulation, postural control, feeding, eye/hand coordination and social/emotional development. Arousal means a neurological mechanism for preparing one's body to orienting stimulus. Its levels are regulated with an interaction of the reticular formation, the limbic system, the hypothalamus and the autonomic nervous system. General strategies such as blowing, sucking, chewing, munching and licking to effectively modulate arousal state are related to SSB. The SSB synchrony is an important treatment principle for children with sensory integration disorder and problems with the modulation of arousal. The purpose of this article is to review concepts of SSB synchrony and the underlying relation between the modulation of arousal and SSB synchrony.

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