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초.중학생의 척추비틀림과 통증과의 관계고찰 - 경근무늬(모아레) 측정법과 설문지 조사를 통해 -
유한길,신병철,민병일,Yoo, Han-Keel,Shin, Byung-Cheul,Min, Byung-Il 척추신경추나의학회 2001 대한추나의학회지 Vol.2 No.1
Objectives : The aim of this study is to investigate the relationship between spinal distortion and pain in elementary and middle school students. Methods : Using the phase-shifting moire developed by KAIST(Korea Advanced Institute of Science and Technology) we measured the back surface distortion, and using questionnaire investigation, we investigated the partial pain in 1008 elementary and middle school students(532 boy students(52.8%), 476 girl students(47.2%)) in Seoul in 1999. And, we statistically analyzed the relationship between spinal distortion and partial body pain Results : This study show that the more age increase, the more the pain in head, neck, shoulder, back and low back Increase considerably among the students aged 9 to 15. The ratio of each partial body pain was 28.4%, 19.7%, 18.2%, 18.7%. 16.0% at the age of 9 and 59.7%, 67.4%, 51.8%, 51.8%, 64.4% at the age of 15 respectively. And, it was shown there was a significant correlation between spine distortion and partial body pain area. When the spinal distortion was found at the upper thoracic and cervical area, the students complained the more pain on head, neck and shoulder(p<0.05) and when the spinal distortion was found at the sacral base, the more headache(p<0.05) Conclusions : It is suggested that the significant correlation exist between the spinal distortion and pain and the pain related to spine disorder get more increase as students grow. We have to study further more about Juvenile postural distortion and it's prevention.
삼차원 합성곱 신경망과 X선 단층 영상에서 추출한 형태학적 특징을 이용한 PEMFC용 가스확산층의 투과도 예측
유한길,윤군진 한국복합재료학회 2024 Composites research Vol.37 No.1
본 연구에서는 고분자 전해질막 연료전지용 가스확산층의 투과도를 예측하기 위해 삼차원 합성곱 신경망 모델을 사용하는 방법론을 소개한다. 먼저, 기계학습 모델을 학습시키기 위해 X-선 단층 촬영을 통해 얻은 실제 가스확산층 이미지에서 형태학적 특성을 추출해 가스확산층의 대표 체적 요소로 이루어진 인공 데이터셋을 생성한다. 이러한 형태학적 특성은 다공성, 섬유 배향, 직경의 통계적 분포가 포함된다. 구축한 인공 데이터셋 대표 체적 요소들의 투과도를 평가하기 위해 격자 볼츠만 방법이 사용되었으며 각각의 대표 체적 요소들의 투과도를 도출하였다. 이러한 인공 데이터셋을 통해 삼차원 합성곱 신경망 모델을 학습시켰으며 인공 데이터셋을 학습한 삼차원 합성곱 신경망 모델이 실제 가스확산층의 대표 체적 요소 투과도 또한 잘 예측하는 것을 확인하였다. In this research, we introduce a novel approach that employs a 3D convolutional neural network (CNN) model to predict the permeability of Gas Diffusion Layers (GDLs). For training the model, we create an artificial dataset of GDL representative volume elements (RVEs) by extracting morphological characteristics from actual GDL images obtained through X-ray tomography. These morphological attributes involve statistical distributions of porosity, fiber orientation, and diameter. Subsequently, a permeability analysis using the Lattice Boltzmann Method (LBM) is conducted on a collection of 10,800 RVEs. The 3D CNN model, trained on this artificial dataset, well predicts the permeability of actual GDLs.
척추측만증 검진을 위한 모아레 체형측정법과 설문조사의 상관성 연구
유한길,김혜정,신병철,Yoo, Han-Keel,Kim, Hae-Jung,Shin, Byung-Cheul 척추신경추나의학회 2003 대한추나의학회지 Vol.4 No.1
Objectives : The purpose of this study is researching for correlation between Moire topography results and questionnaire which include obesity rate, height, weight, posture, pain aspect (low back pain, headache, fatigue, neck pain etc), studying posture, school attendance method, menarche. Methods : The authors practiced Moire topography and questionnaire for primary & middle school 24,419 students [male 12,843, female 11,576] in Jeonbuk, korea in 2002. After we distinguished students who had abnormal finding in Moire topography and statistically analysed the data. Results : According to this research, the abnormal finding in Moire topography results was 37.3% (9,105 students), and students needed X-ray re-examination were 3.9% (953 students). According to statistical analysis, male/female and primary/middle school students have no difference in deformity degree of the body surface examined by Moire. Height and weight have low correlation with deformity degree of the body surface examined by Moire and menarche, pain aspect have no correlation. But, school attendance method by bicycle and $90^{\circ}$upright sitting in study posture is the best way to decrease the deformity degree of the body surface examined by Moire. Conclusions : Following this research, throughout Moire topography could detect trunk asymmetry that couldn't be found existing X-ray examination, and school attendance by bicycle and $90^{\circ}$upright sitting in study posture is good for school students to prevent back deformity.
배전계통 모의운영 기반의 변동성 전원 수용한계 산정방법
노승길(Seung Gil Noh),최우영(Woo Yeong Choi),유한님(Han Nim Yu),국경수(Kyung Soo Kook) 대한전기학회 2020 전기학회논문지 Vol.69 No.1
As the connections of variable energy resources (VER) to the distribution system are recently delayed due to the limited expansion of the network facilities, the accurate calculation of the hosting capacity for VER has become an issue in the distribution system. The utilities would decide to integrate additional VER in a similar way as they have done for the conventional distributed resources. However, this method can be too conservative for VER. The capacity factors of VER are usually low due to their dependency on the weather and the correlation with the electric loads is quite high. Therefore, the criteria for allowing those connection should be based on the probable operating conditions rather than the maximum output based operation condition. For doing this, this paper proposes the method of calculating the capacity of the distribution system for hosting VER considering the probable operating conditions based on the time-series based operation simulation.