• Proceedings of the Korean Information Science Society Conference
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• 2012.06b
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• pp.408-410
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• 2012

기존의 비디오 검색 방법들은 관련 주석이나 영상 정보에 기반하며 사용자의 반응과 관련하여서는 많은 정보를 활용하고 있지 않다. 비디오 시청시 사용자의 뇌신호나 시선추적 정보 등의 인지적 반응을 이용하여 연속적인 비디오 스트림의 각 부분에 대하여 사용자들이 나타내는 관심이나 감성 정보를 추출한다면 보다 인터랙티브한 비디오 데이터 검색 및 추천이 가능하다. 본 논문에서는 비디오를 시청하는 사용자의 안구전도(electrooculogram)를 기록한 후, 장면 전환이 발생한 부분에서의 사건관련전위 분석을 통해 해당 부분에서 나타나는 특징적 반응을 찾고 이에 대한 인지적 해석을 도출했다. 실험 결과 장면 전환 이후200~700ms 부분에서 P300 성분과 유사한 피크가 발생하는 것을 확인하였으며, 이러한 결과는 장면 전환에 따른 피험자의 비디오 내용 인지에 대한 의도 불일치 및 주의력 증가로 해석된다.

• Analytical Science and Technology
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• v.11 no.3
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• pp.194-201
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• 1998

The formaldehyde vapor produced from wood and steel furniture was absorbed in distilled water and derivatized with acetylacetone and determined by UV-visible spectrophotometry. Variation in HCHO emission with time was monitored at room temperature. The emission of volatile compounds from wood, wood-based and steel-based materials was investigated in a 50 mL glass vial. The concentration of the gases emitted in a glass vial was determined by ion-trap GC-MS.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2001.11a
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• pp.255-259
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• 2001

본 연구에서는 긍/부정 판단 과제 시 연령간 뇌파 반응의 차이를 밝히고자 한다. 실험 대상의 연령은 10명(20대 5명, 60대 5명)이었으며, 모두 오른손잡이였다. 실험과제는 의미과제와 일화과제로 구분되며 각각 12문항으로 구성된다. 의미기억과제 덧셈문제를, 일화기억 과제는 도형을 이용하였으며, 마우스 버튼을 눌러 긍/부정 판단 반응을 하도록 하였다. 뇌파는 PE1, PF2, F3, F4, O1, O2에서 단극유도법으로 측정되었으며, EOG를 측정하여 뇌파분석 시에 눈 깜박임으로 인하 noise를 제거하도록 하였다. 뇌파 분석은 원자료를 FFT(Fast Fourier Transformation)를 수행하여 각 대역의 상대적인 power를 구하는 방법으로 이루어졌다. 분석 결과, 반응 시간은 긍/부정판단간의 차이는 없었으나, 두 과제 모두에서 연령별로 유의미한 차이가 있었다. 긍/부정판단간의 따른 뇌파 반응은 명확한 차이가 나타나지 않았다. 연령에 따른 뇌파반응은 theta파, slow beta, fast beta에서 유의한 차이가 나타났다.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2002.05a
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• pp.181-185
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• 2002

The purpose of this study was to find out the relationship between sleep physiological signals data and subjective feeling of sleep quality. Sixteen subjective were investigated and they slept on both comfortable mattress and uncomfortable mattress. Information of sleep stage is one of the most important clues for sleep quality. Polysomnography is basically the recording of sleep. The several channels of brain waves (EEG), eyes (EOG), chin movements (EMG) and heart (ECG) were monitored. Sixteen subjects spent 6 days and nights in the laboratory and the data of sleeping 7h for each of 3 nights was analyzed. Percentage of deep sleep (III and IV, sleep efficiency, WASO, stage 1 and subjective feeling of sleep quality were significantly affected with mattress types (comfortable and uncomfortable mattress). When subjects slept on comfortable beds, percentage of deep sleep and sleep efficiency were higher than those of uncomfortable bed. The percentages of wake after sleep onset and stage 1 were lower when subject slept in a comfortable bed. The subjective feeling of sleep quality agreed with the recorded sleep data also.

• Science of Emotion and Sensibility
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• v.1 no.1
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• pp.105-111
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• 1998

중추신경계돠 자율신경계에 나타난 후각에 의한 감성변화를 측정하기 위해 후각자극은 0.6% 오렌지향과 2.5% valeric acid를 수증기로 포화시키는 후각 자극기를 통해 일정 flow와 농도로 시행하였다. 대조자극은 방안 공기로 향자극 전후에 시행하였으며 뇌파자극은 international 10-20 systim에서 4채널을 사용하였다. 이외에 ECG, EOG, heart rate, skin conductance와 respiration를 기록하였고 뇌파분석은 fast Fourier tuansform analysis의 power spectra로 하였다. 그 frequency banes는 delta(0-4.5Hz), theta(4.5-7Hz)은 쾌하고 친숙하게 valeric acid는 불쾌하고 성가시게 평가되었다. 뇌파분석에서 쾌와 불쾌 자극간의 차이는 PG2-A2 channel 에서 alphal의 자극전후의 차이를 나타내었으며 불유쾌한 자극에서는 모든 channel alphal, alpha2와 beta파 증가를 보였다. 또한 heart rate, galvaric skin resistance는 쾌자극에서 감소양상을 나타내었으며 불쾌자극에서는 반대경향을 보였다. 호흡에서는 쾌자극에서 호흡수 감소경향과 input/output amplitude dutation와 duration의 증가경향을 보였으며 불쾌자극에서는 반대양상을 보였다. 결론적으로 쾌와 불쾌 후각자극으로 감성변화를 뇌파와 자율신경계에서 볼 수 있었다.

• Journal of Microbiology and Biotechnology
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• v.15 no.2
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• pp.265-268
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• 2005

To study the effect of bifidobacteria on preventing allergy response, levels of IFN-$\gamma$, IgG2a, IL-4, and IgG1 were investigated in splenocytes isolated from ovalbumin (OVA)­sensitized allergic mice and BGN4-administered allergy­suppressed mice in the presence of various bifidobacterial strains. Most of the bifidobacteria, except 2A, increased production of Th I-associated immune markers, IFN -$\gamma$ and IgG2a. In addition, most of the bifidobacteria, except 2A and 19A, decreased production of IL-4, whereas the differences in the production of IgG1 were less pronounced. These results suggest that some strains of bifidobacteria may have the potential to prevent the occurrence of allergy by switching Th1/Th2-type antibodies and/or related cytokines.

• Proceedings of the KIEE Conference
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• 2002.07d
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• pp.2724-2726
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• 2002

The effect which electromagnetic wave has influence on visual activity of human, was investigated in this study. The EEG and the EOG generated by the rays of LED were measured in shield room when the subject were exposed at electromagnetic wave(820MHz, 2mV) or not exposed. Each component of the EEG was compared and evaluated on being exposed at electromagnetic wave or not. As a result was $\alpha$ wave was represented relatively low level in the case of exposed at electromagnetic wave and $\beta$ wave was represented relatively low level in the case of not exposed.

• Proceedings of the Plant Resources Society of Korea Conference
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• 1999.10a
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• pp.84-89
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• 1999

The present study has been undertaken to detect edible medicinal plants with antineoplastic property on the basic of a number of traditional Korean medical literatures, besides studies on development of anti-cancer medical wild plants growing in Korea and to prove experimentally their efficacy by in vitro and in vivo tests.235 species from 45 family 79 genus were screened primarily as edible sources of antitumor effect. Among those the crude. extracts of 40 spp. showed considerable cytotoxicity in vitro and especially Pegangkuen(Patrinia scabiosaefolia), Deod-eog(Codonopsis lanceolata), Okssusu(Zea may), and Geureong(Eragrositis ferru-ginea) exhibited significant antitumor activity against sarcoma 180 asites mice. However, additional researches should be mode for the confirmation of their availability as antitumor plants.

• The Transactions of the Korean Institute of Power Electronics
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• v.21 no.6
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• pp.525-529
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• 2016

In the case of a motor system that converts electrical energy into mechanical energy, the region of the motor and that of the generator coexists. In the case of an escalator, the ascending escalator is operated by the motor, whereas the descending escalator is operated by the generator according to the load. To evaluate the proposed method, this study reduces the power of the ascending escalator up to approximately 35% by sharing the regeneration power of the descending escalator. The loss of transfer power nearly exists in the case of the proposed method. Furthermore, the lifetime of the DC link condenser can be extended because it is connected in parallel, thus leading to a twofold increase in capacity.

• Proceedings of the KOSOMBE Conference
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• v.1993 no.05
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• pp.70-73
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• 1993

Design as well as Distortion analysis of signal conditioning filters is very useful for practical applications. Distortion analysis of digital filters for wave forms detection in ECG signals is presented. Several band pass and band reject filters are designed for the analysis. Computer simulations are performed to compare the distortions of the Butterworth type filters and linear phase optimal FIR filters which are widely used for ECG signal processing.