• Sleep Medicine and Psychophysiology
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• v.3 no.2
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• pp.1-17
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• 1996

To demonstrate the clinical usefulness of electroencephalography (EEG) and factors increasing the usefulness of EEG, the authors evaluated each relationship between EEG related factors and clinical variables, and neuroimaging studies (CT and MRI)-related factors, and factors which are related with routine neurological examination for 207 patients who had been evaluated with both of EEG and neuroimaging study(CT or/and MRI). The results were as follows: 1) Abnormality of EEG findings had significant relationships with chief complaints, diagnosis, medication use, seizure attack, pathological reflex, and level of consciousness. However there were no significant correlations between abnormality of EEG findings and neuroimaging studies (CT and MRI)- related factors. 2) Laterality of EEG findings had significant relationships with abnormality, laterality, and focality of CT findings, and also with abnormality of MRI findings. But there were no significant correlations between laterality of EEG findings and clinical variables, and neurological examination-related factors. 3) Anterior-posterior distribution of EEG findings was significantly related with medication use. 4) Focality of EEG findings had significant relationships with sex, sensory dysfunction sign, and cerebellar dysfunction sign. But there were no significant correlations between focality of EEG findings and neuroimaging studies(CT and MRI) related factors. 5) Abnormal EEG pattern had significant correlations with various factors, such as age, chief complaints, duration from onset of symptom to taking MRI, seizure attack, abnormality and nature of lesion in CT findings, cortical atrophy in MRI findings, motor dysfunction sign, sensory dysfunction sign, and pathological reflex. 6) With abnormality on sleep activation, age, age of onset, seizure attack, ventricular enlargement in CT findings, and abnormality of MRI findings were significantly correlated. 7) With abnormality on hyperventilation activation, duration of illness and laterality of MRI findings were significantly correlated. Above results may suggest that abnormality of EEG findings is more closely related with functional change of the brain than structural changes of the brain and laterality of EEG findings is vice versa. And also that medication use has an influence on anterior versus posterior distribution of EEG findings and focality of EEG findings is not related with structural changes of the brain. Activation with sleep may be effective to show age differences and provocation of seizure activity and hyperventilation may be effective to detect the abnormal EEG findings by cerebrovascular insufficiency.

• Journal of the HCI Society of Korea
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• v.9 no.1
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• pp.11-21
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• 2014

We present an experimental framework to analyze the physical reactions and causal factors of Visually Induced Motion Sickness (VIMS) using electroencephalography (EEG) signals and vital signs. We studied eleven subjects who are voluntarily participated in the experiments and conducted online and offline surveys. In order to simulate videos including global motions that could cause the motion sickness, we extracted global motions by optical flow estimation method from hand-held captured video recordings containing intense motions. Then, we applied the extracted global motions to our test videos with action movies and texts. Each genre of video includes three levels of different motions depending on its intensity. EEG signal and vital sign that were measured by a portable electrocorticography device and an electronic monometer in real time while the subjects watch the videos including ones with the extracted motions. We perform an analysis of the EEG signals using Distance Map(DM) calculated by correlation among each channel of brain signal. Analysis using the vital signs and the survey results is also performed to obtain relationship between the VIMS and causal factors. As a result, we clustered subjects into three groups based on the analysis of the physical reaction using the DM and the correlation between vital sign and survey results, which shows high relationships between the VIMS and the intensity of motions.

• Proceedings of the Korea Contents Association Conference
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• 2011.05a
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• pp.571-572
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• 2011

지금까지 뇌와 관련된 언어, 감정, 시각, 촉각 등 의학적 영역에서 뇌에 관한 연구들이 활발히 이루어져 왔다. 그러나 이러한 의학적, 심리학적 성과와 IT와의 융합 및 응용은 아직 초보적인 단계이다. 따라서 의학적으로 입증된 뇌 영역에서 발생하는 뇌파에 대해 보다 세밀한 분석 및 연구를 통해 실질적인 응용 가능한 BCI를 구현해보고자 한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.22 no.4
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• pp.569-574
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• 2018

This paper proposes and implements a LoRa-based emergency exit guide system which can direct the optimal refuge path accounting for the real state of the fires. Each 4-way emergency exit guide sign presents a right direction through one of four LED signs toward the possible exit dynamically calculated by the shortest path algorithm. We constructed a simulation environment with 8 spots of the emergency exit guide signs and 2 exits, which can simulate variant cases of fire accidents, and showed that the proposed algorithm can presents the right guidance for each emergency exit guide sign. We also evaluated the performances of LoRa-based wireless communications using a self developed communication module in the various indoor and outdoor environments. The proposed system can be applied to small and medium sized buildings as well as larger ones in terms of cost efficiency, in which there's no needs to invest for the complex equipments except only sensors and emergency exit guide signs.

• Clinical and Experimental Pediatrics
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• v.59 no.sup1
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• pp.129-132
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• 2016

Ictal tachycardia and bradycardia are common arrhythmias; however, ictal sinus pause and asystole are rare. Ictal arrhythmia is mostly reported in adults with temporal lobe epilepsy. Recently, ictal arrhythmia was recognized as a major warning sign of sudden unexpected death in epilepsy. We present an interesting case of a child with ictal sinus pause and asystole. A 27-month-old girl was hospitalized due to 5 episodes of convulsions during the past 2 days. Results of routine electroencephalography (EEG) were normal, but she experienced brief generalized tonic seizure for 3 days. During video-monitored EEG and echocardiography (ECG), she showed multiple myoclonic seizures simultaneously or independently, as well as frequent sinus pauses. After treatment with valproic acid, myoclonus and generalized tonic seizures were well controlled and only 2 sinus pauses were seen on 24-hour Holter ECG monitoring. Sinus dysfunction should be recognized on EEG, and it can sometimes be treated successfully with only antiepileptic medication.

• Korean Institute of Interior Design Journal
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• no.36
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• pp.128-135
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• 2003

The purpose of this study was to analyze the perception of wayfinding in public interior space. According to this study, a virtual reality simulation test was conducted to examine the effect of wayfinding. Theoretical research was used to explain the psycho-physiological effect of visual perception and case study was carried out to evaluate the physiological response of the subjects. For the physiological evaluation, two simulations with sign and color sample were chosen and the EEG was Used. Data were collected from May 15th. to June 15th. The subjects were 20 students of architecture department and frequency, percentage, ANOVA, T-test, multiple comparisons were used for data analysis.

• Journal of Korea Multimedia Society
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• v.15 no.5
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• pp.587-594
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• 2012

IEEE 802.15.6 standard technology is proposed for low-power wireless communication in, on and around body, where vital signs such as pulse, blood pressure, ECG, and EEG signals are transmitted as a type of data packet. Especially, these vital signs should be delivered in real time, so that the latency from slave node to hub node can be one of the pivotal performance requirements. However, in the case of IEEE 802.15.6 technology data retransmission caused by transmission failure can be done in the next superframe. In order to overcome this limitation, we propose an adaptive polling algorithm for IEEE 802.15.6 technology. The proposing algorithm makes the hub to look for an appropriate time period in order to make data retransmission within the superframe. Through the performance evaluation, the proposing algorithm achieves a 61% and a 73% latency reduction compared to those of IEEE 802.15.6 technology in the environment of 70% traffic offered load with 10ms and 100ms superframe period. In addition, the proposing algorithm prevents bursty traffic transmission condition caused by mixing retransmission traffic with the traffic reserved for transmission. Through the proposing adaptive polling algorithm, it will be possible to transmit time-sensitive vital signs without severe traffic delay.

• Korean Journal of Biological Psychiatry
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• v.2 no.1
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• pp.123-130
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• 1995

A single-blind comparative study was performed using haloperidol as a reference drug in order to evaluate the efficacy and safety of nemonapride, a new benzamide derivative, in sixty-nine Korean schizophrenic patients. the total period of the study was 8 weeks, maximum dosage of nemonapride was 36mg and that of haloperidol was 24mg. Psychopathology and extrapyramidal symptoms were assessed every week or four weeks until the end of the 8th week using the PANSS, BPRS, and 4 point general side effect check list, The drug safety was assessed every week until the end of the 8th week using vital sign, body weight, EEG, EKG, and blood chemistry. In total. one patient discontinued nemonapride treatment and seven patients discontinued haloperidol treatment before the end of the study. Therefore sixty-one patients(88 %) completed the study. PNASS and BPRS scores of the two groups on the end study point demonstrated a significant improvement compared with baseline score. The number of patients who had a clinical improvement of at least 20% in baseline score was similiar in both treatment groups. The difference of Simpson's rating scale socres were significant in both groups, and mean scores were more high in the haloperidol group than in nemonapride group. No significant EKG, EEG changes were induced, no relevant change in body weight or clinical laboratory parameters were observed in the sixty-one patients during 8 weeks and no Significant difference in the both groups. From these results, nemonapride is considered to be a clinically useful drug having a wide range of antipsychotic effect in schzophrenic patients.

• Journal of Oriental Neuropsychiatry
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• v.17 no.2
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• pp.187-198
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• 2006

Bibliotherapy is the field of clinical counceling to treat the emotional, psychiatric and social maladjustment. Neurofeedback is a means by which participants can team voluntary control of the EEG and has been applied to a range of clinical conditions such as epilepsy, attention deficit hyperactivity disorder, depressive disorder. 'Ul-zeong' comes from obstruction of qi by stress. The mind affect the body. The patient has depressed mood, irritable sign, chest discomfort, flank pain, angry state and some strange feeling on the throat. In this case, a female patient, 30 years old, who complained of amnesia, deficiency of the power of the attention and concentration depersonalization, depressed mood, insomnia ect. We treated the patient with bibliotherapy, neurofeedback and oriental medical treatment such as heral medicine, acupuncture treatment and aroma therapy. In result, the symptoms which she complained were improved.

• Journal of Sasang Constitutional Medicine
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• v.23 no.4
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• pp.487-502
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• 2011

1. Objective This study was performed to research the biological change of forest healing according to Sasang constitution. 2. Methods Forty seven applicants are involved in this study. They were classified into three groups(Soyangin, Taeeumin, Soeumin) by QSCC II. And then they participated in forest healing program from March 26 to March 27 in 2011. We performed before and after experiment, including vital sign, electroencephalography(EEG), heart rate variability(HRV), complete blood cell count(CBC), biochemical test(BC), and stress hormones. 3. Results Men had the relaxative effect of tension. While, the group of women and Soyangin was more sensitive to sudden environmental change than the group of men or other constitutions. The tension of women and soyangin's group increased after the forest healing program. Soeumin group showed reduced diastolic blood pressure after the forest healing program. 3. Conclusions Forest healing program has shown better efficacy in relaxation in men than women, in lowering diastolic blood pressure in Soeumin group than other constitutional groups. However a single positive result within this study should be carefully interpreted.