• Science of Emotion and Sensibility
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• v.2 no.2
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• pp.1-10
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• 1999

본 연구의 목적은 중추신경계 반응과 자율신경계 반응을 이용하여 향이 인간에 미치는 영향을 평가하고자 하는 것이다. 본 연구는 20-26세의 남자 10명, 여자 10명으로 구성된 피험자를 대상으로 이루어졌고, 100% Rose oil bulgrian, Lemon oil misitano, Jasmine abs., Lavender oil france (KIMEX.co.ltd) 등 4가지의 향을 사용하여 실험을 수행하였다. 전두엽 (Fz)과 두정엽 (Cz)에서 EEG를 기록하여 대역별 relative power spectrum 값을 구하고 $\alpha$대역에 대한 $\beta$대역의 비($\beta$/$\alpha$)를 통하여 향에 대한 감성 평가를 시도하였다. 또한 자율신경계 반응은 심전도, 피부온도, 피부저항의 생리신호를 측정하였다. 주관적 평가는 향의 세부적인 이미지를 나타내는 후각 감성 형용사를 이용하여, 양극의 7점 척도 25문항, 단극의 5점 척도 40문항, 그리고 각 향의 전반적인 선호도를 묻는 양극의 7점 척도 2문항으로 구성하여 자극제시 전, 후에 각각 실시하였다. 전체적으로 피험자들은 Lemon을 가장 쾌하고 연하다는 평가를, Rose를 가장 불쾌하며 진하다고 평가하였다. $\beta$/$\alpha$의 비는 쾌하고 연할수록 감소하였고 불쾌하고 진할수록 증가하였다. 또한 심박 변화율과 피부온도는 쾌하고 연할수록 감소하였고, 불쾌할수록 반대 결과를 나타내었다. 결론적으로 쾌하고 연한 향과 불쾌하고 진한 향 사이에 $\beta$/$\alpha$의 비와 자율 신경계 반응의 차이를 관찰할 수 있었다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.5
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• pp.848-852
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• 2001

The biomedical signals such as ECG, EMG, EEG, and etc are very Important information to diagnose patients The signal is hard to filter the noise because that is mixed with a lot of noise and biomedical signal has the properties of nonlinear and time-variance. So, we will filter under the measure environment for system or patient. But the general adaptive fillet has brought on the distortion of signal because the adaptive filter adjust the filter coefficient with the fixed order of filter, that filter has the unsuitable order in each other environment. So we propose the dynamic structure adaptive filter that is used for improving that disadvantage. In experiment, we obtain the optimal order of adaptive filter and have food results.

• Proceedings of the KOSOMBE Conference
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• v.1997 no.11
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• pp.459-463
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• 1997

In this paper, we present the elimination of ECG artifact from the polysomnographic EEG and EOG. The idea of this method is that the ECG synchronized EEG segment is detected from ECG and regard samples of that segment a missing signal. After this, we used two interpolation methods to recover the missing segment. One is the Lagrange Polynomial Interpolation Method and the other is the Least Square Error AR Interpolation method. We tested those methods by applying to simulated signals. AR methods works well enough to reject the artifact about 10% of the main artifact level. We practically applied to real EEG and EOG signals. We also developed the algorithm to detect whether the artifact level is high or not. If the artifact level is high, then the interpolations are applied.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.28 no.6
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• pp.217-223
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• 2016

In this study, we investigated the operating method of a driver for an air conditioning system according to the temperature difference between the indoor and outdoor environments of a car parked outside during the summer. Researchers of this study suggest the comfort mode of a car air conditioner to improve the thermal comfort of the driver, thereby maintaining longer comfort. This study separately, analyzed temperatures on a cloudy day and sunny day. The results showed the car indoor heat environment and physiological results (EEG, ECG) of the subject. It showed a difference of the car indoor heat environment by weather with the difference also appearing in the physiological response of the subject. In conclusion, in this paper, on the basis of the physiological response of a subject, a comfortable algorithm of automobile air conditioner is being suggested.

• Journal of the Korean Society of Clothing and Textiles
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• v.45 no.2
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• pp.305-316
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• 2021

In this study, the effect of wearing functional compression pants is verified using a lower-limb wearable robot through a bio-signal analysis and subjective fit evaluation. First, the compression area to be applied to the functional compression pants is derived using the quad method for nine men in their 20s. Subsequently, functional compression pants are prepared, and changes in Electroencephalogram (EEG) and Electrocardiogram (ECG) signals when wearing the functional compression and normal regular pants inside a wearable robot are measured. The EEG and ECG signals are measured with eyes closed and open. Results indicate that the Relative alpha (RA) and Relative gamma wave (RG) of the EEG signal differ significantly, resulting in increased stability and reduced anxiety and stress when wearing the functional compression pants. Furthermore, the ECG analysis results indicate statistically significant differences in the Low frequency (LF)/High frequency (HF) index, which reflect the overall balance of the autonomic nervous system and can be interpreted as feeling comfortable and balanced when wearing the functional compression pants. Moreover, subjective sense is discovered to be effective in assessing wear fit, ease of movement, skin friction, and wear comfort when wearing the functional compression pants.

• Clinical and Experimental Pediatrics
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• v.51 no.5
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• pp.512-517
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• 2008

Purpose : Syncope is relatively common in children and adolescents. Among the etiologies of syncope, neurocardiogenical syncope is the most common, but it is often confounded with seizure. We investigated the clinical features of patients under the age of 15 with neurocardiogenical syncope, compared to patients with neurologic disorders including epilepsy. Methods : Among the children who visited the Department of Pediatrics at Cheongju St. Mary's Hospital and Chungbuk National University Hospital from March 2005 to February 2007, we retrospectively analyzed 69 patients whose chief complaint was syncope. We classified the patients by syncope etiology and made comparisons between the neurocardiogenical syncope (NCS) group and the neurological disorders (ND) group regarding to age; location; time and season in which syncope occurred; associated symptoms, including seizures, provocation factors; prodromes; duration of syncope; frequency of previous syncope; birth history; associated disease; past medical history; family history; neurological exam; physical exam; laboratory findings; electrocardiography; electroencephalography (EEG); head-up tilt test; brain CT; and MRI. Results : Among 69 syncope patients, 53 (76.8%) were in the NCS group and 11 (15.9%) were in the ND group. There were no statistically significant differences between the two study groups except for the presence of prodromes and EEG abnormalities. The presence of prodromes in the NCS group was more common than in the ND group [46.9% (23/49) vs. 9.1% (1/11), (P=0.038)]. The EEG abnormality in the ND group was more common than in the NCS group [90% (9/10) vs. 5.8% (3/52), (P<0.01)]. Conclusion : Our study suggests that detailed history-taking, including that concerning prodromes, is important for the accurate diagnosis of neurocardiogenical syncope, and EEG should be obtained if neurological disorders are suggested.

• Science of Emotion and Sensibility
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• v.22 no.3
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• pp.103-108
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• 2019

Although the Korean Armistice Agreement resulted in complete cessation of the hostilities of the Korean War, it also initiated a rule that obligates Korean men to compulsorily participate in military service. However, psychological factors such as anxiety, stress, and negative perception among the young participants joining the military lead to inefficiency in training and performance. Several types of media production companies have been tasked to deal with this problem. However, their tools have not adequately addressed the root causes of the psychological distress. Stress rates are still high among the youth. This paper offers a method of reducing anxiety and psychological stress among those joining the military. It also aims to help improve concentration and cope with the pessimism of military life. The study measured the increase in concentration as well as the changing rate of anxiety and psychological stress in the participants of two experimental groups. A significant result with t = 2.487, p = 0.042, and 95% confidence levels was revealed by analyzing the data pertaining to the experimental group that was directly exposed to the sensorimotor rhythm (SMR) wave implying that this brain wave alleviated feelings of anxiety and psychological stress. The method proposed in this paper can thus be applied to mitigate stress in soldiers and help them with their personal and military lives. Further interdisciplinary experiments examining the associations between the electrocardiogram and electroencephalogram are required.

• Journal of Yeungnam Medical Science
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• v.8 no.1
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• pp.86-97
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• 1991

To obtain the basic data of prognosis of acute carbon monoxide(CO) intoxication, one hundred and sixteen cases of CO intoxication defined by carboxyhemoglobin(COHb) and admitted via emergency room of Yeungnam University Hospital from Oct. '85 to April' 89 have been clinically analyzed and evaluated, including delayed postanoxic encephalopathy(DPE) and the following results were obtained. 1. The ratio of male to female was 1:1.5 and mental state was drowsy mostly(26.2% of 116 cases) 2. The more disturbed the mental state, the more decreased was the arterial pH and $PaCO_2$, which may be the result of metabolic acidosis. 3. The early laboratory findings in patients of CO intoxication were as follows : leukocytosis-65.5%, increase of hematocrit-23.3%, hyperglycemia-19.8%, increase of GPT-19.8% increase of creatinine-0.9%, and glucosuria-12.1%. 4. The early findings of EKG were abnormal in 35.3% : change of rhythm-25.0%, abnormal ST segment-15.5% (change of rhythm and abonormal ST segment-5.2%) but the conduction disorder was not present. 5. The abnormal EEG above mild degree was 93.1%, of which moderate was most frequent(80.2%). 6. The incidence of DPE was 7.8% among all admitted CO patients. DPE cases had long duration of exposure time(8 hours), severe leukocytosis(20,000) and an abnormal EEG(MA).

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.2B
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• pp.232-243
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• 2010

In this paper, various physiological signals of humans were measured and analyzed to inference their psychological state and biological information, and Bio-Signal Context aware system (BSC), which recognizes the current context of its users as well as the information of exterior environment and offers the service appropriate for them, was designed and implemented. The BSC extracts and analyzes the features from bio-signals, such as the measured electroencephalogram (EEG), electrocardiogram (ECG), and galvanic skin response (GSR), with its different sensors, has the input of the analyzed results, and discriminates four psychological states of rest, concentration, tension and melancholy. In addition to the results of the discriminated psychological states, the information of biological condition analyzed from the user's bio-signals, for example, heart rate variability (HRV), Galvanic skin response (GSR) and body temperature, and the information of external environment related to the user's are collected to offer the service fit for the user's present biological condition by inferring and recognizing the user's present situation.

• The Journal of the Convergence on Culture Technology
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• v.6 no.3
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• pp.427-430
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• 2020

The multi-channel analog signal to digital signal conversion is increasing in the field of IoT and medical measurement equipments. It has chip area and power consumption constraints to use a few single or 2_channel ADC for multi_channel application. This paper described to design and implement a proposed comb filter for multi-channel, 24bit ADC. The function of proposed comb filter is verified by matlab simulation and the FPGA test board. It was fabricated using SK Hynix 0.35㎛ CMOS standard process. The performance and chip size is compared with the existing design method that uses integrator/differentiator and FIR construction. The proposed comb filter is expected to use the IoT product and medical measurement equipments that require multi-channel, low power consumption and small hardware size.