리더쉽에 關한 小考 : 리더쉽에 관한 소고

이춘기 釜山大學校 敎養課程部 1970 論文集(교양과정부) Vol. No.

大衆社會 : 대중사회

이춘기 釜山大學校 敎養課程部 1972 論文集(교양과정부) Vol. No.

족관절 골절의 분류에 관한 고찰

이춘기,이수호,태석기,석세일,최승 대한골절학회 1989 대한골절학회지 Vol.2 No.2

Lauge-Hansen's classification system and Weber's classification system are the two most commonly used systems in ankle fractures. Both are based on causative mechanism but both have some deficiencies. Authors intended to decide which is easily applicable in clinical practice and which provides more information about treatment, especially that of diastasis. So we analysed 143 cases of ankle fractures in Seoul National University Hospital, Kang-nam General Hospital and Namseoul Hospital from January 1983 to December 1988. The results obtained are as follows. 1. Weber's type A fractures correspond not only supination-adduction but also to pronation-abduction and pronation-dorsiflexion, Type B fractures correspond most closeiy to supin- ation-external rotation and possibly to pronation abduction and pronation external rotation. Type C fractures show the nearest equivalence to pronation-external rotation and occasionally correspond to supination-external roation or pronation-abduction. 2. Diastasis was no(ed in 16 cases(28%) of type B and in 18 cases(74%) of type C and this lower incidence was seemed to be due to neglect of diastasis at physical examination or during operation. 3. It seemed to be more reasonable to fix the diastasis with tibiofibular fixation screw especially in type C. 4. Weber's simpler classification system, which can explain the hidden ligamentous injury such as diastasis, was more easily applicable in daily use than Lauge-Hansen ciassification.

A Study on the Method of Safe Shiphandling in Violently Rough Sea by Typoon or Hurricane

이춘기 한국항해항만학회 2010 한국항해항만학회지 Vol.34 No.2

The object of this study is to develop the method of safe conducting of a vessel through stormy sea when we encounter typoon or hurricane on ocean. The scope of investigation in this paper will be limited to safe maneuvering related only with rolling motions of a vessel. The processes of investigations are as follows; Firstly, we decide a CPA(Closest Point of Approach) with the center of the storm and decide significant wave height(H₁/₃) by SMB method and then calculate wave height of the highest of 1000 waves(H₁/₁₀₀₀) and other data. Secondly, we make mathematical model of rolling motions of the vessel on the stormy sea and calculate the biggest rolling angle of the vessel and etc. Thirdly, we decide the most safe maneuvering method to ride out the stormy sea. By the above mentioned method we are able to calculate the status of the stormy sea and ships motions to be encountered and ride out safely through violently rough sea.

Investigation of Ship Maneuvering with Hydrodynamic Effects between Ship and Bank

이춘기,Sam-Goo Lee 대한기계학회 2008 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.22 No.6

When a vessel navigates in confined waters, such as in a harbour or narrow channel, it is well known among experi-enced pilots that the ship handling is greatly affected by the hydrodynamic forces and moments acting between ship and bank or sidewall of the channel. The hydrodynamic forces between ship and bank can be assumed to be functions of the water depth, longitudinal and lateral distance along with ships velocity. In this research, the characteristic fea-tures of the hydrodynamic forces variation during the encounter are described and ilustrated, and furthermore the ef-fect of water depth and the spacing between ship and bank with an angle are summarized and discussed. When a vessel effect of the attracting sway force and a bow-in moment. For water depth to draft ratio (h/d) less than about 2.5, the hydrodynamic force and yaw moment between ship and bank increase sharply as h/d decreases. Also, the hydrody-namic effects decrease as separation between ship and bank (PS )increases and approach to zero when the vessel moves to the wedge-shaped bank under the condition of 0.5 . PS L=

Numerical analysis for hydrodynamic interaction effects between vessel and semi-circle bank wall

이춘기,문성배,오진숙,이상민 대한조선학회 2015 International Journal of Naval Architecture and Oc Vol.7 No.4

The hydrodynamic interaction forces and moments induced by the vicinity of bank on a passing vessel are known as wall effects. In this paper, the characteristics of interaction acting on a passing vessel in the proximity of a semi-circle bank wall are described and illustrated, and the effects of ship velocity, water depth and the lateral distance between vessel and semi-circle bank wall are discussed. For spacing between ship and semi-circle bank wall (SP) less than about 0.2 L and depth to ship’s draft ratio (h/d) less than around 2.0, the ship-bank interaction effects increase steeply as h/d decreases. However, for spacing between ship and semi-circle bank wall (SP) more than about 0.3 L, the ship-bank interaction effects increase slowly as h/d decreases, regardless of the water depth. Also, for spacing between ship and semi-circle bank wall (SP) less than about 0.2 L, the hydrodynamic interaction effects acting on large vessel increase largely as ship velocity increases. In the meantime, for spacing between ship and semi-circle bank wall (SP) more than 0.3 L, the interaction effects increase slowly as ship velocity increases.

Numerical study of hydrodynamic interaction on a vessel in restricted waterways

이춘기 대한조선학회 2012 International Journal of Naval Architecture and Oc Vol.4 No.1

The hydrodynamic interaction between ship and bank can’t be neglected when a vessel is app- roached toward the tip of a wedge-shaped bank in restricted waterways, such as in a harbor, near some fixed obstacles, or in a narrow channel. In this paper, the characteristic features of the hydrodynamic interaction acting on a slowly moving vessel in the proximity of a wedge-shaped bank are described and illustrated, and the effects of water depth and the spacing between ship and wedge-shaped bank are summarized and discussed based on the slender body theory. From the theoretical results, it indicated that the hydrodynamic interactions decrease as wedge-shaped bank of angle β in-creases. For water depth to draft ratio less than about 2.0, the hydrodynamic interactions between ship and bank in-crease sharply as h/d decreases, regardless of the wedge-shaped bank of angle β. Also, for lateral separation more than about 0.2L between ship and wedge-shaped bank, it can be concluded that the bank effects decrease largely as the separation increases.

Hydrodynamic Forces between Vessels and Safe Maneuvering under Wind-Effect in Confined Waters

이춘기,Sam-Goo Lee 대한기계학회 2007 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.21 No.5

Comparison of muscles activity between 90˚ half elevation and full elevation using 18F-FDG PET/CT

이춘기,Eiji Itoi,Hirotaka Sano,정광암,이수찬,조형래 대한견주관절의학회 2011 대한견주관절학회 학술대회논문집 Vol.2011 No.3

측벽근방을 항해하는 대형선박에 미치는 측벽의 영향

이춘기,박한일 한국항해항만학회 2004 한국항해항만학회지 Vol.28 No.4

It is well known that the hydrodynamic interaction forces between ship and bank wall affect ship manoeuvring motion. This paper deals with the interaction effect acting on a ship navigating closely in the proximity of bank wall. In this paper, the calculation method based on the slender body theory for estimation of the hydrodynamic interaction forces between ship and bank wall is applied. The hydrodynamic interaction forces acting on a ship during passing through the proximity of the bank wall are predicted to evaluate an influence of these interaction forces on ship manoeuvrability. The calculation method used in this paper will be useful for prediction of ship manoeuvrability at the initial stage of design, for automatic control system of ship in confined waterways, for discussion of marine traffic control system and for construction of harbour. 측벽과 선박간의 상호 간섭력이 선박 조종 운동에 상당히 크게 작용하는 것은 잘 알려져 있다. 이 논문에서는 측벽 부근을 항해하는 선박에 미치는 측벽의 간섭 영향에 대해서 다루어지고, 선박과 측벽간의 간섭력 추정을 위해 세장체 이론을 토대로 한 계산 방법이 적용되며, 선박 조종 운동에 미치는 측벽의 영향을 파악하기 위하여 선박과 돌제(반원)형상을 하고 있는 측벽간의 간섭력을 수치 계산하였다. 이 논문에서 사용되어진 계산 방법은 제한수역에서의 충돌 회피를 위한 선박의 자동 제어 시스템과 해상 교통 제어 시스템 및 항만 건설등을 위한 초기 설계 단계에서 선박 조종성의 예측에 상당히 유용할 것이다.