• Annals of Clinical Neurophysiology
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• v.3 no.1
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• pp.26-30
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• 2001

Purpose : Eyeball movement is one of the main artifacts in EEG. A new approach to the removal of these artifacts is presented using independent component analysis(ICA). This technique is a signal-processing algorithm to separate independent sources from unknown mixed signals. This study was performed to show that ICA is a useful method for the separation of EEG components with little data deformity. Methods : 12 sets of 10 sec digital EEG data including eye opening and closure were obtained using international 10~20 system scalp electrodes. ICA with 18 tracings of double banana bipolar montage was performed. Among obtained 18 independent components, two components, which were thought to be eyeball movements were removed. Other 16 components were reconstructed into original bipolar montage. Power spectral analysis of EEGs before and after ICA was done and compared statistically. Total 12 pairs of data were compared by visual inspection and relative power comparison. Results : Waveforms of each pair looked alike by visual inspection. Means of relative power before and after ICA were 29.16% vs. 28.27%, 12.12% vs. 12.41%, 10.55% vs. 10.52%, and 19.33% vs. 18. 33% for alpha, beta, theta, and delta, respectively. These values were statistically same before and after ICA. Conclusions : We found little data deformity after ICA and it was possible to isolate eyeball movements in EEG recordings. Many other components of EEG could be selectively separated using ICA.

• The Korean Journal of Physiology and Pharmacology
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• v.16 no.4
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• pp.231-236
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• 2012

We studied the effects of acetylcholinesterase inhibitors, donepezil and galantamine, and an N-methyl-D-aspartate (NMDA) receptor blocker, memantine, on sleep-wake architecture in rats. Screw electrodes were chronically implanted into the frontal and parietal cortex for the electroencephalography (EEG). EEG was recorded with a bio-potential amplifier for 8 h from 09:30 to 17:30. Vibration was recorded to monitor animal activity with a vibration measuring device. Sleep-wake states such as wake (W), slow-wave sleep (S) and paradoxical or rapid eye movement sleep (P), were scored every 10 sec by an experimenter. We measured mean episode duration and number of episode to determine which factor sleep disturbance was attributed to. Donepezil and memantine showed a significant increase in total W duration and decreases in total S and P duration and delta activity. Memantine showed increases in sleep latency and motor activity. Changes of S and P duration in memantine were attributed from changes of mean episode duration. Galantamine had little effect on sleep architecture. From these results, it is showed that galantamine may be an anti-dementia drug that does not cause sleep disturbances and memantine may be a drug that causes severe sleep disturbance.

• Journal of Advanced Navigation Technology
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• v.21 no.2
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• pp.200-205
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• 2017

Modern sports are developing into sports science that incorporates science and various analytical simulation systems for improving records are being developed, and they are helping to improve actual game records. Therefore golf which is one of various sports events, has been popularized among the hobbyists and the general public and there is an increasing demand for correcting the movement attitude of the person. In response to these demands, many systems have been developed to analyze and correct golf swing postures. The golf swing accuracy analysis system analyzes the moments that can not be seen with the naked eye and guides them to understand easily. It can improve the golf swing motion through immediate feedback due to the visual effect. Using the knowledge of golf swing motion collected from golf swing video, we improved reliability. In addition, it provides the ability to visually check and analyze your golf swing video, allowing you to analyze each segment based on various golf swing classification methods.

• Journal of Korean Society of Transportation
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• v.18 no.4
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• pp.31-39
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• 2000

Cellular Phone use while driving is one of the critical causes of traffic accident by falling the driver into the improper lookout and inattention situations by disturbing the driving behaviors and by increasing the driver's mental workloads. These days, therefore, governments in many countries are trying to Prohibit the cellular Phone use while driving by the law focused on the hand-held type of cellular phone. This Paper investigated the impacts on the hands-free cellular Phone use while driving to the drivers Performance among normal and two different level of secondary task driving conditions in the urban of Japan. As the results, quantitative differences of drivers eye movement, subjective mental workload, steering wheel angle entropy, and cognitive Performance of secondary tasks were compared between straight and curve (right turn) section for each driving condition.

• The Transactions of the Korean Institute of Power Electronics
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• v.6 no.4
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• pp.325-332
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• 2001

The vestibular system located in the inner ear controls reflex body posture and movement, It has the semicircular canals sensing an angular acceleration and the otolith organs sensing a linear acceleration. With this organic signal, medical doctor decide if a person has disease or not. To obtain this data, a precision stimular system is considered. Robust control is needed to obtain eye signals induced by off-vertical axis rotation because of an unbalanced load produced by tilting the axis of the system upto 30 degrees. In this study, off-vertical axis rotatory system with visual stimulation system are developed. This system is consisted of head mounted display for generating horizontal, vertical, and three dimensional stimulus patterns. Furthermore wireless recording system using RF modem is considered for noiseless data transmission. Detailed data was described.

• Journal of Korean Elementary Science Education
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• v.33 no.4
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• pp.751-761
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• 2014

이 연구의 목적은 과학적 예상 과정에서 초등학생의 안구운동을 분석하여 과학적 예상의 인지전략을 발견하는 것이다. 예상은 관찰, 측정, 추론과 같은 기초 탐구 과정들을 통해 문제를 해결하는 중요한 탐구 능력이다. 6학년 초등학생 40명이 자발적으로 이 연구에 참여했으며, 과학적 예상 두 과제를 해결하였다. 예상 과제는 점진적으로 변화하는 모형의 다음 모양을 예상하는 것과 14일 간의 기온 그래프를 보고 다음 5일간의 기온을 예상하는 과제였다. 과학적 예상 과정에서 참가자들의 안구 운동을 기록하기 위해 SMI사의 안구운동 추적기를 사용하였다. 40명의 참가자들 중 15명(그룹 A)은 두 과제를 모두 해결하였으며, 17명(그룹 B)은 하나의 과제만 해결하였고, 8명(그룹 C)은 두 과제 모두 해결하지 못했다. 예상 능력이 높은 학생과 낮은 학생의 인지 전략의 차이를 규명하기 위해 그룹 A와 그룹 C의 안구운동을 비교 분석하였다. 연구 결과는 다음과 같다. 첫째, 그룹 A는 짧은 시간 동안 문제를 읽고 문제의 주요어에 집중했으며, 단서들을 비교하고 경향성을 찾고 답을 재확인하는 활발한 움직임을 보였다. 그룹 C는 문제 자체를 이해하는데 긴 시간이 걸렸으며, 주요어와 단서를 찾지 못하고, 무의미한 짧고 빠른 도약 안구 운동을 보였다. 둘째, 그룹 A와 C의 안구 운동의 고정, 도약, 시선 경로를 분석한 결과, 6가지의 안구 운동 패턴이 나타났다. 셋째, 안구운동 분석결과를 토대로 참가자들의 인지 전략을 유동전략과 고착전략의 두 가지로 구분하였다. 본 연구에서 규명한 과학적 예상의 인지전략은 교사들이 과학적 예상의 문제 해결 단계에서 학생들이 겪는 어려움을 이해하고, 예상 능력을 향상시키는 프로그램을 개발하는 것에 도움이 될 것이다.

• Korean Journal of Biological Psychiatry
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• v.19 no.1
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• pp.1-8
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• 2012

The mechanism of psychotherapy is explained by the recent developments in neuroscience and neuroimaging. The purpose of this study is to understand the nature of psychotherapy and to discuss the future of psychotherapy improvement with the help of advances of the neurobiological findings in psychotherapy. For this study, we investigated a wide range of materials. We searched for various researches on psychotherapy, brain, and neurobiology. In addition to the conventional psychodynamic psychotherapy, we investigated research findings on cognitive behavioral therapy, interpersonal psychotherapy and eye movement desensitization and reprocessing (EMDR). Moreover, based on the actual experiences of treating patients, we speculated the neurobiological mechanisms of the process and results of psychotherapy. With the development of neuroscience, we are now able to understand the personal consciousness, unconsciousness and developmental process. Also subdividing the disease is made possible. Personalized treatment has become available, and we are able to predict the prognosis of patients. Our memories are composed by implicit memory and explicit memory. By psychotherapy, we can consciously remember explicit memory, and it becomes easier to explore implicit memory through free association. Through psychotherapy, we will also be able to learn the effect of acquired environment and experience. Psychotherapy is able to correct human behaviors by modifying the memories. Through the regulation of emotions, it becomes possible to modify the memories and correct the behaviors. In this process, doctor-patient relationship is the main factor which cause positive treatment effects. Furthermore imagination therapy or unconscious, non-verbal stimuli could bring about positive treatment effects. Now psychotherapy could be explained and studied by neuroscientific researches. In this sense, we could provide the direction of future advances in neuroscience by the neurobiological understanding of psychotherapy.

• Journal of Physiology & Pathology in Korean Medicine
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• v.16 no.6
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• pp.1291-1296
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• 2002

Blood circulation of brain is divided into two major categories; anterior one from carotid artery and posterior one from vertebrobasilar artery. In stroke patients, it is important to diagnose which is involved, because there is many difference in the aspects of clinical menifestations and prognosis, especially in the acute stage. In some cases of vertebrobasilar infarction, such as Wallenberg's syndrome, charicteristic cranial nerve signs, eye movement disorders and cerebellar signs are appeared. And in Dejerine's syndrome, only pure motor or sensory defecits can be appeared without any brainstem signs. So It shoud be differenciated by Brain MRI from those of the cerebral hemisphere lesions. And in the cases that nausea, vomitting and dysphagia are the first menifestations, it is frequently misdiagnosed as internal medical disease, causing appropriate treatment delayed. In this case report, we are to describe the clinical menifestations and progresses of two cases of brainstem infarctions, review previously published case reports about them and compare them to our cases. The first is Dejerine's syndrome i.e. medial medullary infarction, the second is Wallenberg's syndrome i.e. lateral medullary infarction. Simultaneously we are to investigate the oriental medical approach in the bran stem infarctions.

• International Journal of Internet, Broadcasting and Communication
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• v.10 no.1
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• pp.31-39
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• 2018

The purpose of this study was to examine the meaning and structure of nurses' computer using experience. To do this, we conducted a total of three interviews with 11 nurses working between the ages of 26 and 48. Interview data were interpreted using Giori method (1985) and Lincoln & Guba method (1985). As a result, 112 semantic units were derived, and then 18 sub-components were divided into 5 final components. As a result of the analysis, the computer experience that the nurses used in the hospital consisted of 'used for almost every task', 'usefulness', 'important', 'convenience', 'burden', 'anxiety', desire', simple work level', 'no problems', 'eye, muscle and movement discomfort', 'depends on task', 'more complex', 'accuracy', 'organize contents', 'simple', 'incomparable', and 'easy'. Based on the above conclusions, the nurses' experiences of using the computer in the hospital could be concluded as follows. Currently, almost all nursing jobs in hospitals are using computers. However, most of the tasks related to simple computer tasks related to the ability to use the computer was low, and because of this, the computer did not work properly, or when new programs were introduced to feel the burden and anxiety, want more systematic computer education Found. Especially, according to the career, the difference between computer and hand work was different, Nurses over 20 years said that computers can handle simple tasks that are a bit more complicated than manual tasks, whereas emotional tasks were handicapped, in the 10 to 20 years of experience, computer work was more accurate and appropriate to organize content, Nurses under 10 years were not only easy to work with computers but also have no experience in manual work, they could not compare the computer and the hand work. This study suggests that the use of computers in nurses' work is essential and that more systematic computer-based education should be provided. In addition, due to the nature of the nursing service, the professional opinions of the nurses should be reflected in the development of programs for the emotional nursing work.

• Journal of Digital Convergence
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• v.15 no.8
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• pp.127-135
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• 2017

Consumers tend to feel concern about disclosure of personal information and, at the same time, to avoid inconvenience of procedural complexity caused by the privacy protections. The purpose of current paper is to investigate relationships between opt-in procedural complexity and shopping behavior using smart phones, moderating by the amount of visual attentions using eyetrackers. Therefore, we created a virtual mobile Web-site in which the complexity of opt-in procedures in our experiment is manipulated and measured. Also, we measured the dwell-time of area of interest using SMI-RED 250 instrument for tracking the real eye movement. Results indicated that the levels of procedural complexity are related to repurchase, indicating a moderating effect of the amount of visual attentions. Finally, we discussed several theoretical and practical implications of management for mobile commerce.