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한국 정상 젊은 남성에서의 거골-제 1 중족골간 각과 거골 수평각 및 종골 경사각
이영구,임수재,이상혁,박찬호,이상헌,Lee, Young-Koo,Yim, Soo-Jae,Lee, Sang-Hyok,Park, Chan-Ho,Lee, Sang-Hun 대한족부족관절학회 2010 대한족부족관절학회지 Vol.14 No.2
Purpose: The purpose of this study is to find out the normal angles of the talus-1st metatarsal angle, the talo-horizontal angle and calcaneal pitch angle for diagnosis of foot deformity in Korea. This would be helpful as it would provide a basic angular measurement of flat and cavus foot that indicates the need for operation. Materials and Methods: Within a period of four months from January 2007 to April 2007, We have established 600 feet of 300 males without trauma history of foot. The source to image distance is 40 inches and erect weight bearing radiographs are obtained in anteroposterior and lateral projections. The significant angular measurements that define flat or cavus foot are the talus-1st metatarsal angle, the talo-horizontal angle and calcaneal pitch angle. Results: The mean age was 21 years (19-22 years) old. The mean talus-1st metatarsal angle was $0{\pm}6.9{^{\circ}}$, the mean talo-horizontal angle was $25.8{\pm}4.5{^{\circ}}$ and the mean calcaneal pitch angle was $23.9{\pm}5.1{^{\circ}}$. Conclusion: We can consider that mean talus-1st metatarsal angle, talo-horizontal angle and calcaneal pitch angle are $0{\pm}6.9{^{\circ}}$, $25.8{\pm}4.5{^{\circ}}$ and $23.9{\pm}5.1{^{\circ}}$ as an normal angle limit of young age in Korea.
경사 도핑된 발광층을 갖는 유기발광다이오드의 전기광학적 특성 해석
이영구,오태식,Lee, Young-Gu,Oh, Tae-Sik 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.8
We have carry out numerical simulation of the electric-optical characteristics of organic light emitting diodes with gradient-doped emitting layer which were reported to be effective in improving luminous efficiency and lifetime. In this paper, the basic structure is comprised of ITO/NPB/$Alq_3$:C545T[%]/$Alq_3$/LiF/Al, six devices by separating the emitting layer of $Alq_3$:C545T[%] were studied. As the result, the uniformly-doped devices exhibited superior luminous efficiency-current density characteristics over conventional undoped device. In the case of gradient-doped devices, electric-optical characteristics were improved similar to uniformed-doped devices, unusually the distribution of traped-charge density in the OLED devices was shown as the staircase.
Depth estimation of an underwater target using DIFAR sonobuoy
이영구,Lee, Young gu The Acoustical Society of Korea 2019 韓國音響學會誌 Vol.38 No.3
In modern Anti-Submarine Warfare, there are various ways to locate a submarine in a two-dimensional space. For more effective tracking and attack against a submarine the depth of the target is a critical factor. However, it has been difficult to find out the depth of a submarine until now. In this paper a possible solution to the depth estimation of submarines is proposed utilizing DIFAR (Directional Frequency Analysis and Recording) sonobuoy information such as contact bearings at or prior to CPA (Closest Point of Approach) and the target's Doppler signals. The relative depth of the target is determined by applying the Pythagorean theorem to the slant range and horizontal range between the target and the hydrophone of a DIFAR sonobuoy. The slant range is calculated using the Doppler shift and the target's velocity. the horizontal range can be obtained by applying a simple trigonometric function for two consecutive contact bearings and the travel distance of the target. The simulation results show that the algorithm is subject to an elevation angle, which is determined by the relative depth and horizontal distance between the sonobuoy and target, and that a precise measurement of the Doppler shift is crucial. 현대 대잠전에 있어 잠수함에 대한 2차원 위치추정에 다양한 방법들이 있다. 잠수함에 대한 보다 효과적인 추적 및 공격을 위해 표적 심도는 매우 중요한 요소이다. 하지만 현재까지도 잠수함의 심도를 찾아낸다는 것은 어려운 일이다. 본 논문에서는 최단접근점(Closest Point of Approach, CPA) 전후의 표적 접촉방위와 표적 도플러 신호 등 다이파 소노부이 접촉정보를 이용한 잠수함 심도 추정 기법을 제안하고자 한다. 표적의 상대심도는 표적과 다이파 소노부이의 청음기 간 사선거리 및 수평거리에 피타고라스 정리를 적용하여 결정된다. 이때 사선거리는 도플러변이와 표적 속도에 의해서 계산되며, 수평거리는 표적에 대한 연속된 접촉방위와 표적의 이동거리에 삼각함수를 적용하여 얻을 수 있다. 본 논문에서 제시된 알고리즘의 성능은 소노부이-표적 간 수평거리 및 상대심도에 의해 결정되는 고각과 도플러 변이 값의 측정 정확성에 의해 좌우됨을 시뮬레이션을 통해 알 수 있다.