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정상상태 회전 해석기법을 이용한 타이어의 마모양상 예측
천호정(Hojeong Cheon),김성래(Seongrae Kim),성활경(Hwalgyeong Seong),성기득(Kideug Sung),조춘택(Chuntack Cho),이정민(Jeongmin Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Tire is one of the main parts of motor that generates driving force and braking force. As wearing features of tire among the main parts affects wear mileage, handling and braking distance by changing tire traction, forecasting of wearing features shall be considered to be an important element for assessing tires. This study was intended to identify a correlation between structural design factor of tire tread part and abnormal wear by using finite element model and to secure an independent technology for analyzing tire wear through an establishment of tire wear parameter including friction stress, slip velocity, wear energy and friction energy rate based on analytic technique for steady state rolling.
차원 및 초동발췌방법에 따른 미소진동 음원위치결정 실험연구
천대성(Dae-Sung Cheon),유정민(Jeongmin Yu),이장백(Jang-baek Lee) 한국암반공학회 2019 터널과지하공간 Vol.29 No.4
미소진동기술을 활용한 계측 및 안전관리는 전통적인 방법에 비해 우수성이 인정되어 국내외 광산 등에서 활용되고 있다. 그러나 국내 지하광산의 비정형화와 채굴적과 암반 등이 혼재한 복잡한 구조는 미소진동 전파속도 산정과 미소진동 신호의 초동발췌를 어렵게 한다. 본 연구에서는 여러 초동발췌방법과 차원에 따른 음원위치의 결정에 대해 실험적 연구를 수행하였다. 초동발췌방법은 FTC(First Threshold Cross), Picking window, AIC(Akaike Information Criterion)을 사용하였으며, 2차원 센서 배열일 때 2차원과 3차원 음원발생 실험을 수행하였다. 각 실험에서 음원위치결정 알고리즘은 반복법과 유전자 알고리즘을 사용하였다. 반복법은 센서 배열과 음원발생이 동차원인 경우 효과적이나 음원발생이 상위차원인 경우에는 적합하지 않았다. 반면, RCGA를 이용한 음원위치결정의 경우 상위차원 음원위치를 결정할 수 있었으나 계산속도가 다소 느렸다. 초동발췌방법의 정확도는 음원위치결정 방법에 따라 다르게 나타났으나, Picking window가 전반적으로 높은 정확도를 나타냈다. Microseismic monitoring technologies have been recognized for its superiority over traditional methods and are used in domestic and overseas underground mines. However, the complex gangway layout of underground mines in Korea and the mixed structure of excavated space and rock masses make it difficult to estimate the microseismic propagation and to determine the arrival time of microseismic wave. In this paper, experimental studies were carried out to determine the source location according to various arrival picking methods and dimensional conditions. The arrival picking methods used were FTC (First Threshold Cross), Picking window, AIC (Akaike Information Criterion), and 2-D and 3-D source generation experiments were performed, respectively, under the 2-D sensor array. In each experiment, source location algorithm used iterative method and genetic algorithm. The iterative method was effective when the sensor array and source generation were the same dimension, but it was not suitable to apply when the source generation was higher dimension. On the other hand, in case of source location using RCGA, the higher dimensional source location could be determined, but it took longer time to calculate. The accuracy of the arrival picking methods differed according to the source location algorithms, but picking window method showed high accuracy in overall.
A Case of Polyarteritis Nodosa Involving the Breasts
( Jun Hyeong Cho ),( Jeongmin Hong ),( Wonyong Jo ),( Yun-hong Cheon ),( Hyun-ok Kim ),( Sang-il Lee ),( Young Sun Suh ) 대한내과학회 2015 대한내과학회 추계학술발표논문집 Vol.2015 No.1
Polyarteritis nodosa (PAN) is a necrotizing vasculitis of small- and medium-sized arteries affecting multiple organ systems. Generally, multi-organ involvement is more common than isolated organ involvement in classic PAN. A localized PAN involving breasts alone has rarely been reported. We describe an unusual case of a 72-year-old woman with a localized form of PAN manifested by acute onset of breast pain with fever. Ultrasonography of breasts showed increased echogenicity of subcutaneous fat tissue surrounding the arteries with wall thickening in both upper breasts. Excisional biopsy of left breast revealed leukocytoclastic small to medium-sized arteritis without giant cell infiltration, indicating PAN. Other imaging studies showed that there were no visceral organ involvements. We diagnosed a localized PAN involving breasts, and initiated corticosteroid and methotrexate. She rapidly responded to the treatment and has remained in clinical remission for 1 year.
( Hae-gwang Hwang ),( Dae-hwan Kim ),( Jeongmin Lee ),( Youngwon Mo ),( Se-hoon Lee ),( Yongjin Lee ),( Jae Wook Hyeon ),( Sol Moe Lee ),( Yong-pil Cheon ),( Eun-kyoung Choi ),( Su Yeon Kim ),( Yeong 한국미생물생명공학회(구 한국산업미생물학회) 2018 Journal of microbiology and biotechnology Vol.28 No.10
Recombinant (rec) prion protein (PrP) is an extremely useful resource for studying protein misfolding and subsequent protein aggregation events. Here, we report mass production of high-purity rec-polypeptide encoding the C-terminal globular domain of PrP; (90-230) for human and (89-231) for murine PrP. These proteins were expressed as His-tagged fusion proteins in E. coli cultured by a high cell-density aerobic fermentation method. RecPrPs recovered from inclusion bodies were slowly refolded under reducing conditions. Purification was performed by a sequence of metal-affinity, cation-exchange, and reverse-phase chromatography. The current procedure yielded several dozens of milligrams of recPrP per liter with >95% purity. The purified recPrPs predominantly adopted an α-helix-rich conformation and were functionally sufficient as substrates to measure the seeding activity of human and animal prions. Establishment of a procedure for high-level production of highpurity recPrP supports the advancement of in vitro investigations of PrP including diagnosis for prion diseases.