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홍동희,김만배 강원대학교 정보통신연구소 2005 정보통신논문지 Vol.9 No.-
Recently, the interest in the three-dimensional (3D) images has been increased. Various methods have been attempted to express and produce the contents of 3D images. One of them is the composition of real images and computer graphics images. In this paper, we propose a composition method for a real image that has a depth map acquired from a depth camera as well as computer graphic images. A depth map of the graphic image is generated with a z-buffer technique. We propose an adjustment method for an accurate alignment with a depth map of a real image. The composition of the real and graphics images uses a well-known z-keying technique. Furthermore, it embodies a panorama image with composition of multiple images captured from a moving depth camera. For this, we propose an efficient method which composes the panorama image and graphic image. This method makes it possible to produce realistic contents so that a user can feel realistic and immersive feeling.
홍동희,박성철,양태석,윤태환 한국군사과학기술학회 2002 한국군사과학기술학회지 Vol.5 No.3
중거리 유도무기 체계가 탄도탄과 같이 기동이 심한 표적과 교전할 때에는 지상 레이더는 표적 및 유도탄 위치정보를 보다 빈번하게 전송하여야 하지만, 자신의 임무를 수행해야 하므로 유도탄 및 교전 표적에 대한 정보를 필요이상으로 자주 전송할 수 없다. 이러한 상황에서 탐색기가 자체적으로 표적의 거리, 속도, 방향을 측정함으로서 지상레이더에 추가 부담을 지우지 않고 우수한 추적 정밀도로 교전성능을 향상할 시킬 수 있는 고반복 펄스열을 사용하는 PRF 변조방식을 제안한다.
교두감합위로부터 출발한 수직교합고경의 단계적 증가가 사지 근력에 미치는 영향에 관한 연구
홍동희,이성복,최대균,Hong, Dong-Hee,Lee, Sung-Bok,Choi, Dae-Kyun 대한턱관절교합학회 2003 구강회복응용과학지 Vol.18 No.2
According to our recent investigation that the increase in the occlusal vertical dimension made the appendage muscle strength got higher, the occlusal appliances were made by increasing the occlusal vertical dimension "from the centric relation" position of the mandible. In this experiment, the authors tried to study the change in the appendage muscle strength due to increase in occlusal vertical dimension from intercuspal position(ICP) of mandible with the same subjects and manner as the former experiment. For this study, ten male athletes in a mean age of 23 year who were joined the former study were selected. All the subjects had a complete or almost complete set of natural teeth and reported no subjective symptoms of temporomandibular disorders. Upper and lower casts were mounted on the semi-adjustable articulator at the intercuspal position and a point was marked on the attached gingival area between the right canine and the right 1st. premolar in each upper and lower cast. From the points, the occlusal vertical dimension was increased by 2mm, 3.5mm and 5mm, and then each 10 maxillary type occlusal splint at each 3-increased position were fabricated with heat curing clear acrylic resin. Including the intercuspal position, the 3 kinds of occlusal splints were placed on the subjects individually, and then isokinetic muscle strength on 7 parts of the human appendage which are shoulder, knee, ankle, wrist, forearm, elbow and hip was measured with the CYBEX 6000 SYSTEM (Lumex, NewYork, USA). The results were as follows: The highest mean value in muscular strength was shown at the position of 2mm-increased vertical dimension. The muscle strength during internal/external rotation of shoulder and knee, plantarflexion of ankle, flexion of elbow, and flexion and extension of hip at the increased occlusal vertical dimension position were significantly higher than them at the intercuspal position (p<0.05). Only in view of the increase in the appendage muscle strength, regardless of the way of making the occlusal splints by elevating the occlusal vertical dimension from the centric relation position or intercuspal position, the occlusal splints had an effect on the increase of isokinetic muscle strength at the occlusal vertical dimension which increased within the proper range on the habitual arc of closure.
홍동희,박성철,이성용,김정렬,박진규 한국군사과학기술학회 2003 한국군사과학기술학회지 Vol.6 No.4
Radar signal simulation is increasingly gaining in importance according as modem radar systems are more complex. Although computer performance has been advanced, it is difficult to implement the real-time simulation because the detailed model for the radar is necessary to get the desired accuracy. In order to achieve real time operation, we propose radar signal generation technique using ambiguity function, Instead of wellknown correlation method. The ambiguity function is the mathematical modeling of the signal processing procedure which is a simulation section to require the most computations.