http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Correlation between Muscular Fatigue and EMG Activity during the Prolonged Casual Computer Work
조원학,이우영,최현기 한국비파괴검사학회 2009 한국비파괴검사학회지 Vol.29 No.3
An experimental study was conducted to investigate the effects of turtle neck syndrome, so called, on muscular fatigue and muscle activity. Six subjects (males) participated and performed the prolonged casual computer work in the study. EMG signals from six muscles of the dominant neck-back region were acquired and recorded for 10 seconds at the beginning and the end of three hours computer work. EMG was recorded from six muscles by using a computerized data recording and analysis system. Power spectrum function of EMG was calculated off-line by means of a signal processing software package. Power spectrum functions were smoothed with a moving average filter of 21 points and normalized with respect to the maximal value achieved during the trials. Muscle activity and median frequencies of Sternocleidomastoid(SCM) in turtle neck posture was approximately 51%, which were less than those in normal neck posture. SCM also showed the biggest decrease in median frequency. Results will provide the insight into the neck-back injury mechanism of turtle neck patients. Furthermore, they will be helpful in developing rehabilitation programs for restoring patients’ neck-back functions.
조원학 한국문학언어학회 2023 어문론총 Vol.98 No.-
This study aims to analyze the content and discuss the meaning of the early writings of Eunchon, Jo Ae-young, known as the writer of Naebang-gasa, in the school-magazine Baehwa. Previous studies of Eunchon have centered on her life history and writerly consciousness, but there has been a relative lack of attention to her early works. This paper introduces and analyzes the contents of the works that Eunchon submitted to Baehwa while she was a student at Paihwa Girls' High School. These works are valuable sources that demonstrate the level and diversity of Eunchon's writing abilities, and in order to analyze them, the characteristics of the Baehwa and Eunchon's life are discussed as background. Eunchon's earliest works included in the Baehwa are three travel essays and one poem. <Ui-dong Travel Essay> is a work that describes the beauty of nature, but does so in an objective manner, rather than focusing on sentimentality. The cherry blossoms of Ui-dong functioned as a material to stimulate national consciousness. <Dukdo Travel Essay> was created out of a strong desire to learn modern culture, and at the same time, the nihilism of a colonial student emerged. <Downtown Travel Essay> catches the contradictory governance of the Japanese Empire in a modern space. It depicts the existence of brutality in military units, slavery in the post office, censorship in radio stations, and direct discrimination in rice mills. In the poem <Jinjudam Pond> she expressed her affection for the people involved in the resistance movement and his sadness at the reality of their suffering. These works have high value because they have been preserved in the form in which they were created. In addition, we can see that Eunchon's literary skills were not limited to Naebang-gasa, but radiated into various genres of writing, making her a modern female writer who faithfully mastered the new modern literary style.
The Relationship Between Pure-tone Noise and Human Bio-signal Response
조원학,황성호,최현기 한국정밀공학회 2011 International Journal of Precision Engineering and Vol. No.
The experiences of stress are common to all living things. Noise is one of the most widespread sources of environmental stress. Noise is a pervasive aspect of many modern community and work environments. So, it is important to consider noise when we design human-oriented products. This study investigates the responses of electrocardiogram (ECG) and eye tracker data in order to evaluate the direct effects of low, middle, and high frequency noise on the two main physiological stress axes: the autonomic nervous system, and cognitive responses for a human-oriented product design. A subject was exposed to low (100 Hz), middle (1000 Hz), and high frequency (100000 Hz) noise while awake. ECG and eye tracker data were collected during noise exposure. Sympathetic nervous system (SNS) activity was less in the low and high frequency noise ranges compared to the no sound. On the other hand, parasympathetic nervous system (PNS) activity was greater in the low and high frequency noise ranges than the SNS activity in the no sound. The cognitive responses or latency saccadic eye movement (LSEM), in low or high frequency noise was greater than that in the no sound. And results of EEG and eye movement were statistically significant in low and high frequency noise (r > 0.93, p < 0.05). The findings of this study indicate that the stress induced by low frequency noise is as stressful as the stress induced by high frequency noise. Additionally, utilizing eye tracker data and acquiring the LSEM is useful in the analysis of human stress responses during various stressful situations in addition to the analysis of human stress responses during noise exposure.
조원학,황성호,최현기 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.3
Various different human-oriented approaches are required in industrial activities. Noise is one of the most widespread sources of environmental stress. So, it is important to consider noise when we design human-oriented products. This study investigates the responses of EEG and eye movement data in order to evaluate the direct effects of low, middle, and high frequency noise on the two main physiological stress aspects: the EEG band power (alpha and beta frequency bands) and pupil response time (PRT) for a human-oriented product design. Fifteen subjects were exposed to low (100 Hz), middle (1000 Hz), and high frequency (10000 Hz) noise while awake. EEG and eye movement data were collected during noise exposure. Alpha band activity in low and high frequency noise ranges was smaller than that in no sound. Alpha band activity decreased 19.3 ± 4.5 % in the low frequency noise range. Additionally, alpha band decreased 19.5 ±5.4% in high frequency noise range. On the other hand, Beta band activity in low and high frequency noise ranges was greater than that in no sound. Beta band activity increased 26.9 ± 7.9 % in the low frequency noise range and increased 30.6 ± 6.1% in high frequency noise range. The PRT, or visual cognitive responses, in low or high frequency noise was greater than that in no sound. PRT increased 15.3 ± 3.0% in low frequency noise range. Alternatively, PRT increased 18.1 ± 3.2% in high frequency noise range. And results of EEG and eye movement were statistically significant in low and high frequency noise (r > 0.92, p < 0.05). The findings of this study indicate that the stress induced by low frequency noise is as stressful as the stress induced by high frequency noise. Additionally, utilizing eye movement data and acquiring the PRT is useful in the analysis of human stress responses during various stressful situations in addition to the analysis of human stress responses during noise exposure.
전방향 동요 시 압력중심의 기구학적 특성을 통한 하이힐 착용 여성의 자세균형회복 메커니즘에 관한 고찰
조원학(W. H. Cho),서민좌(M. J. Seo),최현기(H. K Choi) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
High-heeled women have been identified with balance control problems. The purposes of this study were to objectively quantify the displacements and velocities of center-of-pressure (COP) of body during waist pulling and to compare the differences between barefooted and high-heeled situations. We used a waist pulling system which has three different magnitudes to sway the subjects. We found that the kinematic information of barefooted and high-heeled women"s COP is very important in understanding the mechanism of postural balance control of women in every-day life. In the high-heeled’s case, the displacement of COP increases in 200% as against bare footed. Also the velocity variation of COP grows three times than the bare footed. COP analysis in postural balance study of high-heeled women is also considered useful in development of the safety systems that prevent high-heeled women from falling.