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오현식,김경호 충북대학교 산업과학기술연구소 2002 산업과학기술연구 논문집 Vol.16 No.1
Submarine pipelines, one of the most important subjects in coastal engineering, are widely used in coastal structures. The stability of submarine pipelines is more important than other offshore structures, because local scour have influence on exposed pipelines due to waves generated in shallow water region. The local scour influence by wave should be previously considered because the self-burial caused to local scour induces additional static or dynamic loads and various risk elements. However, local scour occurring in waves has not been investigated as widely as in currents. This paper presents experimental investigations of scour depth with respect to scour parameters using regular waves. The investigations encompass shallow water region conditions. Developments of scour near the pipeline are observed and recorded due to variations of wave periods, wave heights and pipe diameters. This paper analyzes correlation between KC number and various scour parameters. By investigating new approach method suggested by C¸evik et al.(1999), it is found that modified Ursell number is valid for main parameters occurring to local scour below pipeline. Also this study analyzes relation between KC number and modified Ursell number and suggests modified equation based on experimental data. Under special experimental conditions, incomplete scours are appeared. This is caused by multiple correlation made with water depth(d), wave heights(H), period(T) and pipe diameter(D).
현수 케이블로 연결되어 협동하는 쿼드-로터 무인비행체의 종축 동역학 특성
오현식,탁민제,김영철,문정호 한국항공우주학회 2012 한국항공우주학회 학술발표회 논문집 Vol.2012 No.11
이 논문은 물리적 매개체(예, 케이블, 막대 등)로 연결되어 협동하는 다수의 비행로봇 운동역학에 대하여 소개한다. 이를 위하여 현수(懸垂) 케이블로 연결된 쿼드-로터 무인비행체의 종축 동역학 모델링을 수립한다. 현수교(懸垂橋)에 쓰이는 케이블 모델과 쿼드-로터 무인비행체의 모델을 혼합하여 전체 시스템의 동역학 모델을 소개한다. 이 모델에 대한 시뮬레이션 프로그램을 개발하여, 시스템의 동역학 특성을 검토한다. This paper presents dynamics of co-working quadrotor UAV’s which are linked by physical mediator, e.g. cable, bar, and so on. To observe the dynamics, a longitudinal model of two quadrotor UAV’s linked by a catenary cable is derived. We barrow the cable model from the studies of suspension bridges and combine it with the simple rigid-body model of quadrotor UAV’s. Some simulation codes of the system which consists of two UAV’s and a cable are developed. Using the codes, we can examine the behavior of the system.
오현식,최유덕,김현중,이경화,김명규,우영종,김재휴,이민철 대한병리학회 2003 Journal of Pathology and Translational Medicine Vol.37 No.6
Background : Neuronal migration disorder (NMD) is one of the causes of medically intractable epilepsy. As neurosurgical treatments for medically intractable epilepsy have expanded recently, precise histopathologic diagnosis is required. Histopathologic grading of NMD is important due to its association with neocortical development and expectation of prognosis. Many studies revealed abnormalities of neuronal cytoskeletal protein in abnormal neuronal cells of NMD. Methods : We performed immunohistochemical staining for neurofilament protein (NF) subtypes, one of the neuronal cytoskeletal proteins, and investigated the staining pattern of specific cells in each grade of NMD. Results : NF-L was more intensely labeled in perikarya, dendrites, and axons of normal or small sized dysplastic neurons, cytomegalic neurons, and balloon cells than of normal-looking neurons. Furthermore, positive reaction was more intense in high-grade lesion. NF-H and NF-M were mainly positive in the axons of gray and white matter and weakly positive in a few cytomegalic neurons and some balloon cells. Conclusion : NF-L is a better marker than NF-H and NF-M for the detection of normal or small sized dysplastic neurons, cytomegalic neurons, and balloon cells and for grading of NMD.