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A Study on Touchless Panel based Interactive Contents Service using IrDA Matrix
Lee, Minwoo,Lee, Dongwoo,Kim, Daehyeon,Ann, Myungsuk,Lee, Junghoon,Lee, Seungyoun,Cho, Juphil,Shin, Jaekwon,Cha, Jaesang The Institute of Internet 2015 International Journal of Internet, Broadcasting an Vol.7 No.2
Touch panel is mainly applied to pressure type touch panel but it occur a low recognition rate and error during long-term use. So, it is partly applied to capacitive touch panel to compensate for these problems but it also can occur a same problems via pollutions. Touch technology has developed a various method but it is not used because of high costs and difficult installation process. So, in this paper, we proposed an input method of touchless panel using IrDA matrix. This method is conducted using an IrDA Matrix composed of depth sensor. It is possible to offer a various contents for multi user. The proposed technology need a development of a high sensitivity sensing method and high-speed processing method of position information for Seamless operation control. And, it is required high-precision drive technology. Also, we proposed a Seamless user recognition for interactive contents service through a touchless panel using IrDA matrix.
Implementation of AR Remote Rendering Techniques for Real-time Volumetric 3D Video
Daehyeon Lee,Munyong Lee,Sang-ha Lee,Jaehyun Lee,Soonchul Kwon 한국인터넷방송통신학회 2020 International Journal of Internet, Broadcasting an Vol.12 No.2
Recently, with the growth of mixed reality industrial infrastructure, relevant convergence research has been proposed. For real-time mixed reality services such as remote video conferencing, the research on real-time acquisition-process-transfer methods is required. This paper aims to implement an AR remote rendering method of volumetric 3D video data. We have proposed and implemented two modules; one, the parsing module of the volumetric 3D video to a game engine, and two, the server rendering module. The result of the experiment showed that the volumetric 3D video sequence data of about 15 MB was compressed by 6-7%. The remote module was streamed at 27 fps at a 1200 by 1200 resolution. The results of this paper are expected to be applied to an AR cloud service.
A Study on Touchless Panel based Interactive Contents Service using IrDA Matrix
Minwoo Lee,Dongwoo Lee,Daehyeon Kim,Myungsuk Ann,Junghoon Lee,Seungyoun Lee,Juphil Cho,Jaekwon Shin,Jaesang Cha 한국인터넷방송통신학회 2015 International Journal of Internet, Broadcasting an Vol.7 No.2
Touch panel is mainly applied to pressure type touch panel but it occur a low recognition rate and error during long-term use. So, it is partly applied to capacitive touch panel to compensate for these problems but it also can occur a same problems via pollutions. Touch technology has developed a various method but it is not used because of high costs and difficult installation process. So, in this paper, we proposed an input method of touchless panel using IrDA matrix. This method is conducted using an IrDA Matrix composed of depth sensor. It is possible to offer a various contents for multi user. The proposed technology need a development of a high sensitivity sensing method and high-speed processing method of position information for Seamless operation control. And, it is required high-precision drive technology. Also, we proposed a Seamless user recognition for interactive contents service through a touchless panel using IrDA matrix.
Daehyeon Park,Yunju Lee,Junhyuk Ham,Seung Chang Yoo,Kiyoung Kim,Donghee Lee,Yongdeog Kim,Ji Hyun Kim 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.2
In Korea, borated stainless steel (BSS) is used as spent fuel pool (SFP) storage rack to maintain nuclear criticality of spent fuels. As number of nuclear power plants and corresponding number of spent fuels increased, density in SFP storage rack also increased. In this regard, maintain subcriticality of spent nuclear fuels was raised as an issue and BSS was selected as structural material and neutron absorber for high density storage rack. Because it is difficult to replace storage rack, corrosion resistance and neutron absorbency are required for long period. BSS is based on stainless steel 304 and it is specified in the ASTM A887-89 standard depending on the boron concentration from 304B (0.20-0.29% B) to 304B7 (1.75-2.25% B). Due to low solubility of boron in austenitic stainless steel, metallic borides such as (Fe, Cr)2B are formed as secondary phase metallic borides could make Cr depletion near it which could decrease the corrosion resistance of material. In this paper, long-term corrosion behavior of BSS and its oxide microstructures are investigated through accelerated corrosion experiment in simulated SFP condition. Because corrosion rate of austenitic stainless steel is known to be dependent on the Arrhenius equation, a function of temperature, corrosion experiment is conducted by increasing the experimental temperature. Detail microstructural analysis was conducted with scanning electron microscope, transmission electron microscope and energy dispersive spectrometer. After oxidation, hematite structure oxide film is formed and pitting corrosions occur on the surface of specimens. Most of pitting corrosions are found at the substrate surface because corrosion resistance of substrate, which has low Cr content, is relatively low. Also, oxidation reaction of B in the secondary phase has the lowest Gibbs free energy compared to other elements. Furthermore, oxidation of Cr has low Gibbs free energy which means that oxidation of B and Cr could be faster than other elements. Thus, the long-term corrosion might affect to boron content and the neutron absorption ability of the material.
Daehyeon Park,Yunju Lee,Junhyuk Ham,Seung Chang Yoo,Kiyoung Kim,Donghee Lee,Ji Hyun Kim 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.1
In Korea, borated stainless steel (BSS) is used as a storage rack in spent fuel pools (SFP) to maintain the nuclear criticality of spent fuels. As the number of nuclear power plants and the corresponding amount of spent fuels increased, the density in SFP storage rack also increased. In this regard, maintaining subcriticality of spent nuclear fuels became an issue and BSS was selected as the structural material and neutron absorber for high density storage rack. Since it is difficult to replace the storage rack, corrosion resistance and neutron absorbency are required for long period. BSS is based on stainless steel 304 and is specified in the ASTM A887-89 standard depending on the boron concentration from 304B (0.20-0.29% B) to 304B7 (1.75-2.25% B). Due to the low solubility of boron in austenitic stainless steel, metallic borides such as (Fe, Cr) 2B are formed as a secondary phase. Metallic borides could cause Cr depletion near it, which could decrease the corrosion resistance of the material. In this paper, the long-term corrosion behavior of BSS and its oxide microstructures are investigated through accelerated corrosion experiment in simulated SFP conditions. Because the corrosion rate of austenitic stainless steel is known to be dependent on the Arrhenius equation, a function of temperature, the corrosion experiment is conducted by increasing the experimental temperature. Detail microstructural analysis is conducted using a scanning electron microscope, transmission electron microscope and energy dispersive spectrometer. After oxidation, a hematite structure oxide film is formed, and pitting corrosion occurs on the surface of specimens. Most of the pitting corrosion is found at the substrate surface because the corrosion resistance of the substrate, which has low Cr content, is relatively low. Also, the oxidation reaction of B in the secondary phase has the lowest Gibbs free energy compared to other elements. Furthermore, oxidation of Cr has low Gibbs free energy, which means that oxidation of B and Cr could be faster than other elements. Thus, the long-term corrosion might affect the boron content and the neutron absorption ability of the material. Using boron’s high cross-section for neutrons, the neutron absorption performance of BSS was evaluated through neutron transmission tests. The effect of the corrosion behavior of BSS on its neutron absorption performance was investigated. Samples simulated to undergo up to 60 years of degradation before corrosion through accelerated corrosion testing did not show significant changes in the neutron shielding ability before and after corrosion. This can be explained in relation to the corrosion behavior of BSS. Boron was only leached out from the secondary phase exposed on the surface, and this oxidized secondary phase corresponds to about 0.17% of the volume of the total secondary phase. This can be seen as a very small proportion compared to the total boron content and is not expected to have a significant impact on neutron absorption performance.
니켈 나노입자의 레이저기반 소결을 통한 유연성 전도성 전극 가공
김대현(Daehyeon Kim),이한종(Hanjong Lee),문상흔(SangHeun Moon),이창민(ChangMin Lee),구상모(Sangmo Koo) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Recently, the importance of processing techniques on a flexible substrate is emerging. In particular, as the application of flexible devices has expanded, research on fabrication for electrically conductive patterns on this diverse substrate, especially on polymers, has been performed. In this study, it is noted that nickel has a higher resistance to oxidation than copper. The nickel nanoparticle-based ink was synthesized and sintered on the Polydimethylsiloxane(PDMS) substrate through laser-direct writing. Nickel conductive patterns processed on flexible substrates retain their shape and properties despite mechanical deformation (e.g., bending). It was confirmed that the electrical properties were also maintained for a long time under oxidizing conditions. Therefore, it was utilized in applications such as flexible heaters, and it will be possible to expand to more applications.
이준호 ( Lee Junho ),연익준 ( Youn Ikjun ),이명진 ( Lee Myungjin ),김규형 ( Kim Gyuhyeong ),송대현 ( Song Daehyeon ),양승호 ( Yang Seungho ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
건설은 사회기반을 설치하고 인간 생활환경을 개선하는데 필수적인 요소이지만 대기, 수질, 폐기물, 소음진동, 토양환경 등 환경보전에 미치는 부정적인 영향이 큰 편이다. 특히 건설사업장에서는 공사과정 중에 표토의 굴삭작업 등을 수반하기 때문에 이 과정에서 표토유실 및 토사면의 노출이 발생할 수 있고 이는 강우 시에 토사가 섞인 오탁수 등 비점오염물질 발생을 야기하여 현장 주변 수계에 영향을 준다. 건설현장에서 발생하는 폐수는 공사의 종류와 시공방법에 따라 특성이 매우 다르다. 폐수가 발생되는 대표적인 공사는 터널, 지반, 기초공사, 지하철 공사 등 대부분 굴착이 필요한 현장이다. 최근의 토목건설은 과거의 무분별한 개발의 개념을 자연과 조화를 이루고 환경파괴를 최소화하는 친환경적 구조물의 설계시공이 요구되고 있다. 한편, 국내 비점오염원 관리 기술은 오탁방지막, 세륜시설, 침사시설 등의 제한적인 처리시설만이 제시되고 있으며, 이러한 형식의 비점오염원 처리시설은 그 처리 효율이 제한적이고 해당 현장의 환경 특성을 적절히 반영하지 못하는 경우가 많다. 따라서 처리효율이 높고 건설현장 특성에 크게 영향을 받지 않는 적용성이 용이한 비점오염 처리기술의 개발이 시급한 실정이다. 또한 건설폐수 처리 장치에서 제거된 폐 슬러지의 재활용 및 자원화 방안을 모색하여 건설폐수의 종합적인 처리시스템을 구축이 필요하다. 본 연구에서는 공사 시 발생하는 폐수를 키토산과 같은 친환경 응집제를 적용하여 초고속 응집 및 응결을 통해 후속처리공정과 연계하여 수면적부하율을 극대화한 처리장치를 개발하고자 하였다. 이를 위해 건설현장에서 발생하는 폐수의 특성을 분석하고, 이를 처리하기 위한 처리공정을 실험실 규모로 구성하여 실험을 통해 최적 운전조건 및 설계조건을 도출하고자 한다. 연구에서 도출된 결과는 실규모 처리시설 제작 및 사업화 기술개발을 위한 기초자료로 활용하고자 하였다.