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모바일 증강현실에서 컬러마커를 이용한 콘텐츠시스템 구현
이종혁,Lee, Jong-Hyeok 한국정보통신학회 2012 한국정보통신학회논문지 Vol.16 No.8
Black marker cause unnatural problems between the existing various contents and marker. To solve this problem, we tested frequency of 3D objects according to the various colors and color placement. Based on this, infant's learning content system based NyARToolkit for the mobile-based augmented reality was implemented. By insert to color marker, We are solved the unnatural problems in the Implemented system. and infant can study seamlessly because concentration increases by the familiar character on the markers.
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고휘도 LED 조명 기술을 이용한 고속 가시광통신 시스템 기술 개발
이종혁,장경순,김병규,김진호,Lee, Jong-Hyeok,Jang, Kyung-Soon,Kim, Byung-Gyu,Kim, Jin-Ho 한국융합보안학회 2014 융합보안 논문지 Vol.14 No.7
In this study, we design and develop a VLC test-bed system which has been recently issued and focused as good convergence technology in the world. We classify the developed system into transmission part including analog LED driver module, digital signal modulation module, and receiver part with light sensing module and signal demodulation module. Then we introduce important characteristics and components. We analyze some factors for each module. To validate the communication of the designed VLC system, we develop a VLC sender-receiver simulator which can control the dimming factor and flicker-free effect. From the developed system, we observed about 12Mbps of data transmission rate with 0.5m~1m of distance, without packet loss. We verified the real-time communication with multimedia streaming which can be considered as very high date rate. The developed system and technology will be useful for some converged data services like indoor positing, home appliances, and indoor parking system.
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이종혁,Lee, Jong-Hyeok 한국정보통신학회 2013 한국정보통신학회논문지 Vol.17 No.8
Recently our lives have become more convenient as a development of smart phones. For this reason, smart phone users have increased rapidly as well. However existing built-in functions in smart phone are not fully supported variety of currently released applications. So Appcessories that combines mobile handsets and accessories is attracting the notice of smart phone users. In this paper, we design and implement remote control Appcessories using Bluetooth communication. Also we verify a robustness of mobile terminals and system hardware and convenience of using applications by applying it to the infant car system.
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치과용 심미수복재료 세로모에서 수분흡수와 체적 변화에 관한 연구
이종혁,Lee, Jong-Hyuk 대한치과보철학회 2009 대한치과보철학회지 Vol.47 No.2
Statement of problem: The increasing demand for esthetic restorations has been required developing new materials for tooth colored restoration. Ceromer(Ceramic Optimized Polymer) has some advantages over porcelain, and has gained increasing popularity in restorative dentistry. However, there is little information on the dimensional changes in a clinical restoration in moist conditions. Purpose: This study examined the dimensional changes in Ceromer restorations with a clinical crown shape that were fabricated in a clinical manner. Material and methods: The crowns for the maxillary central incisor were fabricated with two Ceromers($BelleGlass^{(R)}$ and $Targis^{(R)}$) using a similar clinical restoration manufacturing technique. A total of twenty specimens were prepared and immersed in distilled water at room temperature to allow for water absorption. The weight, height and width were measured at 24, 72 and 168 hours. The accumulated ratios of the changes were calculated and evaluated using a paired t-test and an independent independent t-test. Results: The dimensions and weight increased with increasing soaking time. $Targis^{(R)}$ showed significant differences in height and weight between 24 hours and the other times(P<.05). $BelleGlass^{(R)}$ showed significant differences in width and weight between 24 hours and the other times. The two materials showed different changing patterns of the dimensions but there were no statistically significant differences between them. Conclusion: The dimensions and weight of the Ceromer restorations were changed by water absorption. The clinical crown shaped specimen showed more complicated dimensional changes than the simplified specimens.
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주변 골흡수 양상에 따른 임플란트와 골의 응력분산에 관한 유한요소 분석
이종혁,김성훈,이재봉,한중석,양재호,Lee, Jong-Hyuk,Kim, Sung-Hun,Lee, Jae-Bong,Han, Jung-Suk,Yang, Jae-Ho 대한치과보철학회 2010 대한치과보철학회지 Vol.48 No.2
Purpose: This 3D-FEA study was performed to investigate the influence of marginal bone loss pattern around the implant to the stress distribution. Material and methods: From the right second premolar to the right second molar of the mandible was modeled according to the CT data of a dentate patient. Teeth were removed and an implant ($\Phi\;4.0{\times}10.0mm$) was placed in the first molar area. Twelve bone models were created; Studied bone loss conditions were horizontal bone loss and vertical bone loss, assumed bone loss patterns during biologic width formation, and pathologic vertical bone loss with or without cortification. Axial, buccolingual, and oblique force was applied independently to the center of the implant crown. The Maximum von Mises stress value and stress contour was observed and von Mises stresses at the measuring points were recorded. Results: The stress distribution patterns were similar in the non-resorption and horizontal resorption models, but differed from those in the vertical resorption models. Models assuming biologic width formation showed altered stress distribution, and weak bone to implant at the implant neck area seams accelerates stress generation. In case of vertical bone resorption, contact of cortical bone to the implant may positively affect the stress distribution.
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이종혁,Lee, Jong-Hyeok 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.1
According to the spread of computers and the development of the information society, people are focused on privacy information. As the development of its associated policy and technology, it has been tried various attempts to protect their personal information. In this paper, we proposed anti-screen capture modules to protect personal information or a company's confidential information for agencies and departments that keeps top security. As a result, we can prevent an illegal use or a stealing of another person's information in a public agency or personal computer. Also modules can stop exposures of top security data and personal information during they communicate with others in their institution's sever system.
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