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수평이동방식 입체카메라의 입체영상의 결상 위치 추정 방법
임영태,김남,권기철,Lim, Young-Tae,Kim, Nam,Kwon, Ki-Chul 한국광학회 2006 한국광학회지 Vol.17 No.6
입체영상 획득시 입체영상 결상 위치는 입체감을 유발하는 중요한 요인이 된다. 평행방식과 교차방식 카메라는 주시각 제어가 불가능하고 획득 영상의 왜곡이 심한 단점에도 불구하고 구조가 간단하여 결상 위치 추정방법에 대한 다양한 연구가 진행되고 있다. 수평이동방식 카메라는 왜곡이 적고 주시각 제어가 가능하여 평행방식과 교차방식보다 많은 장점을 가지고 있지만 구조의 복잡성 때문에 연구가 부족하다. 본 논문에서는 입체영상의 촬영과 디스플레이의 기하학적 모델을 이용하여 수평이동방식 입체카메라의 입체영상 결상 거리 추정 방법을 제안하였다. 기존의 추정방법을 이용한 입체영상 결상거리는 ${\alpha}_2$가 1과 0.75 일 때 587.64mm에서 791.16mmn, 639.53mm에서 809.50mm 사이의 분포를 가지고 있다. 수평이동전과 수평이동후의 결상 위치 차이는 1.08mm에서 0.11mm까지의 범위를 가지고 있고 거리에 따른 수평이동량과 같은 형태임을 알 수 있었다. The position of stereoscopic objects is an important parameter to induce three-dimensional effects such as convergence control and image distortions. There are three kinds of stereoscopic cameras : Parallel, Toed-in, and Horizontal-Moving cameras. In this paper we proposed the method for estimating stereoscopic object position with a horizontal-moving camera. In the previous methods, viewing angle ratios are used to estimate the object positions. Our method based on the horizontal movements of the camera to estimate the positions. Using geometrical models of shooting and display we experimented with two methods. Results of experiments showed the distance of stereoscopic objects on virtual screen related to horizontal movement.
집적 영상 현미경과 집적 영상 디스플레이를 이용한 미세시료의 3차원 영상 재생
임영태,박재형,권기철,김남,Lim, Young-Tae,Park, Jae-Hyeung,Kwon, Ki-Chul,Kim, Nam 한국통신학회 2009 韓國通信學會論文誌 Vol.34 No.11b
집적 영상 현미경에서 획득한 요소 영상을 이용하여 집적 영상 디스플레이에서 재생하였다. 일반화된 서로 다른 두 렌즈 어레이를 이용하는 집적 영상의 획득과 재생의 관계를 이용하여 집적 영상 현미경 및 디스플레이 시스템에 적용하였다. 집적 영상 현미경에서 획득한 요소 영상을 재생하기 위해서 스케일링이 적용된 요소 영상이 필요하다. 집적 영상을 재생할 때 요소 영상의 정보 손실을 최소화하는 스케일링 계수와 요소 영상의 왜곡을 최소화하는 스케일링 계수를 선택해야 한다. 본 연구에서는 $125{\mu}m$ 피치 사이즈의 마이크로 렌즈 어레이를 가지는 집적 영상 현미경으로 시료를 촬영하고 1mm 피치 사이즈의 렌즈 어레이를 가지는 집적 영상 디스플레이로 촬영된 시료를 3차원 영상으로 재생하는 실험을 수행하였다. 이 때, 요소 영상의 스케일링 계수는 집적 영상 현미경에서 획득한 요소 영상의 정보 손실을 최소화 하는 값으로 설정하였다. Microscopic specimen was captured by an integral imaging microscope and displayed as a three-dimensional image by an integral imaging display system. We applied the generalized relationship between pickup and display using two different lens arrays to our integral imaging microscope and display system. In order to display three-dimensional microscopic image, scaling of the captured elemental images is required. We analyzed the effect of the scaling coefficient in terms of the distortion of the displayed three-dimensional image and the loss of the captured elemental images. In our experiment, microscopic specimen is picked up by an integral imaging microscope having $125{\mu}m$ elemental lens pitch and displayed as three-dimensional image by an integral imaging display system having 1mm elemental lens pitch. The scaling coefficient was chosen to minimize the elemental image loss.
압축 및 인장 응력 하에서의 FCC 나노 와이어 안정성에 관한 연구
임영태(Young Tae Im),김성엽(Sung Youb Kim),엄윤용(Youn Young Earmme) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The properties of nanowires can be different from those of bulk materials due to the effects of surface. In this paper, using the molecular statics simulation with the embedded-atom method potential, the stability of FCC nanowires under uniaxial compression and tension was investigated. Ni and Pd nanowires with a square cross-section and surface orientations of [100], [010] and [001] were created with initial atomic positions corresponding to the bulk face-centered-cubic crystal structure. The length and the cross-section area of the nanowires were varied. The atoms in the wire were then relaxed to a minimum energy state at 0 K. The simulation results show two kinds of instabilities : partial slip and phase transformation. Comparing the simulation results with Hill criterion, it is found that nanowires become unstable before the system meets Hill criterion under compression and elastic constants and the deformation mode are in a good agreement with Hill criterion under tension.
노인대상 12주간 균형능력 향상 운동이 계단 내리기 보행 시 주요 관절각 및 지면반력 변화에 미치는 영향
김의환 ( Eui Hwan Kim ),이용식 ( Yong Sik Lee ),임영태 ( Young Tae Lim ),박양선 ( Yang Sun Park ),김태완 ( Tae Whan Kim ) 한국운동역학회 2010 한국운동역학회지 Vol.20 No.3
The purpose of this study was to investigate the effects of balance ability improvement exercise program which applied to the elderly people for increasing balance, stability and range of motion. Ten elderly people and ten university students were recruited as the subjects. Kinematic data were collected by seven real-time infrared cameras while subjects walk stair descent as a pre-test. Korean folk dance exercise program was applied to the elderly for 12 weeks. Same experiment on stair descent walk was performed as post-test. Results indicated that CM movement and selected joint angle patterns of elderly group after treatment changed to the similar patterns of young group. However, ankle joint angle and vertical GRF of elderly group after treatment also increased compared to those of the elderly group before treatment. This might be explained by the fact that elderly used a different walking strategy which maximize support base for increasing stability. Overall, these results indicated that the exercise treatment may affect to adapt and improve the gait pattern of stair descent of elderly people.
임영태 ( Young-tae Im ),김창수 ( Chang-soo Kim ),정회경 ( Hoe-kyung Jung ) 한국인터넷정보학회 2004 인터넷정보학회논문지 Vol.5 No.5
조직이 분업화 조직화 되어갈수록 구성원간의 의사소통 및 합리적 결과도출을 위한 의사결정 방법은 많은 발전을 하고 있다. 그 대표적인 예로 기존회의의 단점인 공간의 제약성을 극복한 온라인 회의가 있는데, 이러한 온라인 회의 또한 회의시간이 지날수록 발언된 내용은 많아지고, 참석자의 기억 속에서 하나씩 사라지게 되어 지금까지 결정된 것이나 앞으로 결정해야 될 것 등에 대한 일관된 인식이 부족해져서 논지가 흐려지고 현재 상황에 대한 인식이 약해지게 되는 단점을 가지고 있다. 이에 본 논문에서는 서론에서는 전제 되어야 할 사항과 관련 연구현황 및 방향에 대해 언급하고, 본론에서는 지식을 온톨로지화 할 수 있는 방안을 연구하며 지식의 온톨로지화에 따른 한계성의 극복 방안으로 지식 관리자 개념 도입을 제안한다. 그리고, 이렇게 온톨로지화된 지식을 XML로 구조화 하고 이 정보를 요약 관리하고 시각적으로 표현해 주기 위한 구체적인 시스템을 설계 및 구현한다. 또한, 결론에서는 비고 및 고찰을 통해 기능 및 효율성을 검증해 보며 결론과 향후 발전 방향을 제시한다. As the organization has been coming to specialization and systematization, meetings have been holding for communication among members and deduction of rational outcome. Also process of meeting procedure has been developing. Those on-line meetings are getting grown because the on-line meetings with messenger and chatting are the best examples for overcoming space limitation problem. But, the on-line meetings have unavoidable weak points. The more a meeting is processed, the more point of argument is out of focus and perception of current situation is reduced. Therefore, this thesis proposes and describe that in introduction, think that pre-defined things , analysis and direction of Ontology ,in body, draw up a plan how to make ontology to knowledge, and, how to get out of bounds limitation that as make ontology to knowledge. And, design and implementation actual system that organize this ontological Knowledge, and then managing and summarizing visualizing them. Also, in conclusion, after remark and consider this system in which using the ontology based on XML, and proposes conculsion and directional development point.
경륜선수의 등급 및 경주전법에 따른 상해빈도 분석 비교
김승현(Kim, Seung-Hyun),김주영(Kim, Joo-Young),이용식(Lee, Yong-Sik),임영태(Lim, Young-Tae),성동준(Sung, Dong-Jun) 한국체육과학회 2014 한국체육과학회지 Vol.23 No.6
The aim of this study is to investigate the frequency of injury according to race tactics and players level in cycle racer. To achieve this purpose, the survey is made via the questionnaire which consist six categories and answers were used to perform frequency analysis. The level of 342 cycle racers were assigned into SS1(n=6), S1(n=55), A1(n=135), and B1(n=128) by the questionnaire. The results indicated that 50 % of SS1, 38.3 % of S1, 53% of A1, and 65.1% of B1 experienced a fall from cycle and the frequency of injury according to players level was significantly difference(p<.008). In similarly to the experienced a fall from cycle, race tactics was significantly difference among the players level(p<.001). However, the comer of injury induction and the season of injury induction had no significantly difference among the players level. Finally, the cite of injury was also observed and was not significant differences among the palyers level. In addition, the pelvis was most common injury site in cycle racers. We suggest that information about the frequency of cycle racers injury is unclear, therefore, further study needs to more actively for the prevention of injury in cycle racers.
진공 상온 분사 공정으로 제조된 Al_{2}O_{3} 필름의 광 투과도에 미치는 미세조직 특성의 영향
김진영 ( Jinyoung Kim ),박형권 ( Hyungkwon Park ),남진수 ( Jin Su Nam ),손경수 ( Kyung Soo Son ),임영태 ( Young Tae Im ),이재욱 ( Jae Wook Lee ),정봉근 ( Bong Geun Chung ),이창희 ( Changhee Lee ) 대한금속재료학회(구 대한금속학회) 2016 대한금속·재료학회지 Vol.54 No.1
Glass materials have been applied in various industrial fields. Research on improvement of mechanical properties has consistently been performed due to this material’s intrinsically vulnerable characteristics. Surface modification is considered as the promising method to supplement the weakness; especially, ceramics are thought of as appropriate materials for film materials because of their outstanding mechanical properties and their chemical stability. However, unfortunately, the optical transmittance of ceramic materials is poor, and can rather restrict this material’s utilization in glass. In this regard, the optical transmittance mechanism of vacuum kinetic sprayed Al_{2}O_{3} film was investigated. To control and analyze the film’s optical property, the gas flow rate, as a main process variable, was controlled; then, post heat-treatment was performed. Consequently, the film’s optical property was determined by three microstructural factors. That is, crystallite size, defects (including lattice distortion), and amorphous phase, generated during particle deposition, were found to strongly affect the transmittance.