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레진의치상 수리 시 인공타액 흡수도에 따른 결합강도 연구
강명호,이명곤,Kang, Myung-Ho,Lee, Myung-Kon 대한치과기공학회 2011 대한치과기공학회지 Vol.33 No.1
Purpose: There are some advantages of the acrylic resin denture base ; appropriate strength, volume safety, simple processing apparatus, and low cost. But, it have a weakness for fracture by intense pressure or shock. However, the repairs for resin denture base are possible using various materials and techniques. There is a few studies in repairs for resin denture base, but not clinical researches. And there is no studies in absorbed saliva into the region of fracture and bond strength. This study is to observe re-bond strength of resin denture base after repairing under saliva absorption. Methods: The samples were made of heat curing resin and the rectangular parallelepiped specimens which were 50mm long, 10mm wide and 3mm high. The four different groups immersed in the artificial saliva for 2 weeks were prepared, 1) no repaired control samples, 2) immediately repaired samples, 3) repaired samples after 1 day dry, and 4) repaired samples after 3 days dry. The prepared samples were repaired by two different curing materials, self curing resin and heat curing resin method. Each groups composed of 10 specimens were experimented with the three point bending tests for bonding strength measuring Results: There were under condition absorbed in the artificial saliva and repaired by self curing resin method, repaired specimens after 1 day and 3 days dry groups had higher values of bonding strengths than control group, and bonding strengths of immediately repaired samples were similar to those of control samples (p<0.05). There were under condition immersed in the artificial saliva and repaired by heat curing resin method, immediately repaired samples showed similar values to bonding strengths of control groups, and repaired samples after 1 day and 3 days dry groups were lower than those of control group (p>0.05). Conclusion: In this study, the repairs for resin denture base were remarkably high values of bonding strengths than those of the past, and showed that have stable bonding strengths independent of saliva absorption of denture base, so present repairs for resin denture base can be performed, regardless of saliva conditions.
강명호,차우창,Kang, Myong-Ho,Cha, Woo-Chang 대한인간공학회 2002 大韓人間工學會誌 Vol.21 No.3
The road sign in dynamic traffic system is an important element which affects on human cognitive performance on driving. Web-based vision system simulator was developed to examine the cognition time of the road sign in dynamic environment. This experiment the cognition time of the road sign in dynamic environment. This experiment was designed in with-subject design with two factors: vehicle speed and the amount of information of the traffic sign. It measured the cognition time of the road sign through two evaluation methods: the subjective test with vision system simulator and computational cognitive model. In these two evaluations of human cognitive performance under the dynamic traffic environment, it demonstrated that subject's cognition time was affected by both the amount of information of traffic sign and driving speed.
LAN 에서 운용되는 T.130 멀티미디어 회의 시스템의 구현
강명호(Kang Myung Ho),김홍래(Kim Hong Rae),성동수(Seong Dong Su),허미영(Huh Mi Young),함진호(Hahm Jin Ho),성광수(Seong Kwang Su) 한국정보처리학회 1999 정보처리학회논문지 Vol.6 No.6
For the multimedia conference in various networks. international standard works progress which H and T series. T.120 series are recommended for multipoint data conference in various networks, but its demerit is not supported with video and audio capabilities. H.32X series are recommended for videoconference in various networks, but its demerit is that there is the recommendation per network, therefore overall management is difficult in mixed networks. To solve these problems, the combination of H.32X and T.120 are used but many difficulties exist for consistent control. To solve these problems, T.130, T.131, and T.132 standardizations are made progress, and these are analyzed and implemented over LAN(Local Area Network). Our system introduced in this paper is currently operated on LAN, but can be operated with mixed networks with addition of underlying network dependent protocols.
항공탑재 EO/IR의 영상떨림을 고려한 영상기반 자동 초점조절 기법 연구
강명호(Myung-Ho Kang),김성재(Sung-Jae Kim),고영준(Yeong Jun Koh) 한국항공우주학회 2022 韓國航空宇宙學會誌 Vol.50 No.1
본 논문에서는 타겟과의 거리 및 EO/IR 장비 내부 온도정보를 이용한 전통적인 방식의 초점조절 방식의 단점을 보완할 수 있는 향상된 영상기반 초점 조절 기법을 제안하였다. 영상기반 초점 조절시 카메라시선의 흔들림에 의해 동일한 표적으로 시선을 지향하지 못해 영상의 다른 영역에 초점 윈도우를 설정함으로 인해 정확한 초점 값을 계산할 수 없게 된다. 이러한 문제를 해결하기 위해 영상추적 기법을 적용하여 동일한 위치에 포커스 윈도우가 설정되도록 하여 최적의 초점위치 탐색 정확도를 향상시키고자 하였다. 또한 동일한 초점위치에서 플랫폼의 진동이나 흔들림 그리고 대기환경에 의한 영상 불안정으로 인해 동일한 초점 값이 계산되지 않기 때문에 인접프레임 중에 보다 안정적인 상태에서 획득된 프레임을 선택함으로써 국부최대값(Lcoal maxima) 빠지지 않고 최적의 초점 위치를 찾는 기법을 제안하였다. In this paper, we propose methods to improve image-based auto-focus that can compensate for drawbacks of traditional auto-focus control. When adjusting the focus, there is a problem that the focus window cannot be set to the same position if the cameras LOS is not directed at the same location and flow or shake. To address this issue, we applied image tracking techniques to improve optimal focus localization accuracy. And also, although the same focus value should be calculated at the same focus step, but different values can be calculated by cameras fine shaking or image disturbance due to atmospheric scattering. To tackle this problem a SAFS (Stable Adjacency Frame Selection) has been proposed. As a result of this study, our proposed methodology shows more accurate than traditional methods in terms of finding best focus position.
다양한 망에서의 실시간 멀티미디어 회의를 위한 영상 · 음성 제어부의 설계 및 구현
강명호(Myung-Ho Kang),김홍래(Hong-Rae Kim),성동수(Dong-Su Seong),허미영(Mi-Young Huh),함진호(Jin-Ho Hahn),성광수(Kwang-Su Seong) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.2Ⅲ
다양한 망에서의 실시간 멀티미디어 회의를 위한 영상 · 음성 제어 프로토콜의 표준규격으로서 ITU-T에서 T.130 시리즈를 정의하고 있다. T.130은 영상 · 음성 제어 프로토콜에 관해서 전반적인 소개를 하고 있으며, T.132 Audio-Visual Control(AVC)는 영상 · 음성 제어를 위한 프로토콜을 정의하고 있고, T.131은 H.320, H323, H324와 같은 다른 타입의 멀티미디어 시스템과의 mapping에 관한 사항을 소개하고 있다. 그러나 구체적으로 영상 · 음성 제어를 위한 자료구조 및 이들의 운영방법, 알고리즘에 대해서는 프로토콜 구현시의 사항으로 남겨놓았다. T.130 시리즈는 T.120 시리즈의 GCC(Generic Conference Control)와 MCS(Multipoint Communication Service)를 이용함으로써 PSTN을 비롯하여 PSDN, CSDN, ISDN, LAN, 그리고 ATM등 모든 망을 지원한다. 본 논문에서는 AVC 프로토콜의 설계와 구현된 AVC를 소개한다.