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Electroencephalography (EEG) assessment of the wearing comfort of mass-productive eyewear frames
Ji-Hye Baek,Dal-Young Kim 대한시과학회 2015 대한시과학회지 Vol.17 No.3
목 적: 본 연구의 목적은 3D 안경 또는 스마트 글라스와 같은 대량생산형 안경테의 착용감을 평가하는데 있어 EEG 측정의 유용성을 보이는 것이었다. 방 법: 무작위 순서로 2 종류의 대량생산형 안경테(안경테-A와 -B)를 착용하고 있는 동안 40명의 피검자의 뇌파 강도를 주파수에 따라 측정하였다. 2 종류의 안경테에 대해서 측정된 α파의 시간에 대하여 평균 한 상대강도를 서로 비교하였다. 결 과: 안경테 A의 시간에 대하여 평균한 α파의 상대강도가 안경테 B의 시간에 대하여 평균한 α파의 상대강도보다 통계적으로 유의하게 더 강한 것으로 나타났다. 결 론: 시간에 대하여 평균한 α파의 상대강도는 대량생산형 안경테의 착용감을 상대적으로 비교하는데 있어 객관적인 지표로 활용될 수 있다. Purpose: An aim of this study was to show usefulness of EEG(electroencephalography) measurement for assessment of the wearing comfort of mass-productive eyewear frames such as 3D(three dimensional) or smart glasses. Methods: Brain wave intensities of 40 subjects were measured as a function of frequency for they wore two kinds of mass-productive eyewear frames (frame-A and –B) in random sequence. Time-averaged relative intensities of the detected α-waves were compared to each other for the two kinds of eyewear frames. Results: The time-averaged relative intensities of α-waves of the frame-A were higher than those of the frame-B with statistical significance (p < 0.05). Conclusions: The time-averaged relative intensity of α-waves can be an objective index for comparative assessment of the wearing comfort of mass-productive eyewear frames.
Baek, Ji Hye,Kim, Young Sun,Yi, Kwan Hyung Occupational Safety and Health Research Institute 2015 Safety and health at work Vol.6 No.2
Background: To investigate the relationship between musculoskeletal disorders and comorbid health problems, including depression/anxiety disorder, insomnia/sleep disorder, fatigue, and injury by accident, and to determine whether certain physical and psychological factors reduce comorbid health problems. Methods: In total, 29,711 employees were selected from respondents of the Third Korean Working Conditions Survey and categorized into two groups: Musculoskeletal Complaints or Musculoskeletal Sickness Absence. Four self-reported health indicators (overall fatigue, depression/anxiety, insomnia/sleep disorder, and injury by accident) were selected as outcomes, based on their high prevalence in Korea. We used multiple logistic regression analysis to determine the relationship between comorbid health problems, musculoskeletal complaints, and sickness absence. Results: The prevalence of musculoskeletal complaints and musculoskeletal sickness absence due to muscular pain was 32.26% and 0.59%, respectively. Compared to the reference group, depression/anxiety disorder and overall fatigue were 5.2-6.1 times more prevalent in the Musculoskeletal Complaints Group and insomnia/sleep disorder and injury by accident were 7.6-11.0 times more prevalent in the Sickness Absence Group. When adjusted for individual and work-related physical factors, prevalence of all four comorbid health problems were slightly decreased in both groups. Conclusion: Increases in overall fatigue and depression/anxiety disorder were observed in the Musculoskeletal Complaints Group, while increases in insomnia/sleep disorder and injury by accident were observed in the Sickness Absence Group. For management of musculoskeletal complaints and sickness absence in the workplace, differences in health problems between employees with musculoskeletal complaints and those with sickness absence as well as the physical and psychological risk factors should be considered.
Baek, Ji Hye,Choi, Myung Gil,Kim, Da Bin,Kim, Na Yeong,Kang, Eungyu,Ahn, Sangdoo,Chang, Suk-Kyu Elsevier 2018 Tetrahedron letters: the international organ for t Vol.59 No.13
<P><B>Abstract</B></P> <P>A new fluorescent probe for the selective detection of industrially important peracetic acid (PAA) was developed via oxidative cleavage of the phenylselenyl ether derivative of the 4-hydroxynaphthalimide. The probe showed no noticeable changes towards common oxidants and environmentally relevant metal ions and anions. Furthermore, PAA signaling was not influenced by the presence of background ionic species, except for certain redox-active species. Practical application of the probe to the determination of PAA in tap water and atmosphere was successfully executed using a smartphone as a stand-alone signal capturing and processing device.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new peracetic acid (PAA)-selective reaction-based fluorescent probe was developed. </LI> <LI> Signaling was due to the PAA-assisted oxidative cleavage of selenyl ether. </LI> <LI> Selective signaling was possible over other common oxidants, metal ions, and anions. </LI> <LI> Using a smartphone as a stand-alone device, PAA detection in tap water was possible. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Space Weather Monitoring System for Geostationary Satellites and Polar Routes
Baek, Ji-Hye,Lee, Jae-Jin,Choi, Seong-Hwan,Hwang, Jung-A,Hwang, Eun-Mi,Park, Young-Deuk 한국천문학회 2011 天文學會報 Vol.36 No.2
We have developed solar and space weather monitoring system for space weather users since 2007 as a project named 'Construction of Korea Space Weather Prediction Center'. In this presentation we will introduce space weather monitoring system for Geostationary Satellites and Polar Routes. These were developed for satisfying demands of space weather user groups. 'Space Weather Monitoring System for Geostationary Satellites' displays integrated space weather information on geostationary orbit such as magnetopause location, nowcast and forecast of space weather, cosmic ray count rate, number of meteors and x-ray solar flux. This system is developed for space weather customers who are managing satellite systems or using satellite information. In addition, this system provides space weather warning by SMS in which short message is delivered to users' cell phones when space weather parameters reach a critical value. 'Space Weather Monitoring System for Polar Routes' was developed for the commercial airline companies operating polar routes. This provides D-region and polar cap absorption map, aurora and radiation particle distribution, nowcast and forecast of space weather, proton flux, Kp index and so on.
Comparison of ERP Patterns by Suction and Puff Stimulus
( Ji Hye Baek ),( Mi Hyun Choi ),( Ul Ho Jeong ),( Sung Jun Park ),( Seon Young Gim ),( Hyung Sik Kim ),( Soon Cheol Chung ) 한국감성과학회 2015 추계학술대회 Vol.2015 No.-
The aim of this study was to compare event-related potential (ERP) patterns activated somatosensory area (C3) and motor area (FC5) about suction and puff stimulus by applying these stimuli to the fingers. Twelve healthy right-handed men (mean age = 23.1 ± 2.0 years) participated in the study. One session consisted of a Rest Phase (9sec) and a Suction or Puff Phase (3sec). During the Rest Phase, the subjects were instructed to relax and get a ready without any stimulus being applied. During the Suction or Puff Phase, suction or puff stimulus of same intensity (4 psi) was applied to the first joint of the right index finger. Subjects performed 1 session (30 trials) for each suction and puff stimulus. 1 session is repeated twice. After completion of the session, a subjective magnitude test was presented. We extracted the maximum positive amplitude, minimum negative amplitude and relevant latency values from ERP signals from C3 and FC5. Suction and puff stimuli had similar subjective magnitude scores. For C3, the maximum positive latency (suction: 82ms, puff: 100ms) (p = .001) and minimum negative amplitude latency (suction: 167ms, puff: 188ms) (p<.001) was appeared earlier for the suction stimulus than for the puff stimulus. For FC5, the maximum positive latency (suction: 81ms, puff: 90ms) (p = .013) and minimum negative amplitude latency (suction: 168ms, puff: 186ms) (p = .010) was appeared earlier for the suction stimulus than for the puff stimulus. The suction stimulus caused a more sensitivity in the somatosensory area (C3) and motor area (FC5) than did the puff stimulus during suction and puff stimuli of the same intensity.