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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,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.
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.
Hyunkyung Lee,Hyeonseop Lee,Daehyeon Kim,Jinho Jeon,Choongyu Hwang,Sungkyun Park,Jong Mok Ok,Kanghyun Kim,Songkil Kim,Haeyong Kang 한국물리학회 2024 새물리 Vol.74 No.1
To fabricate large-area graphene transistors, the transfer of chemical vapor-deposited grapheme onto preferred substrates and the patterning of drain/source electrodes are necessary. However, these transfer and deposition processes commonly employ polymers such as poly(methyl methacrylate) and photoresists, which can leave residual polymers and adsorbed molecules on the channel, thus affecting the electrical properties of the devices. In this study, we investigated the effects of heat treatment on the device characteristics related to the polymer residues and adsorbates on graphene surface by analyzing the transfer curves. Our findings demonstrate that proper vacuum annealing can enhance the device’s performance and reduce contact resistance. Moreover, we propose an advanced procedure that incorporates thermal annealing under vacuum after each step of polymer removal. This method is particularly beneficial for enhancing the contact and surface properties of channels in general fabrication processes involving polymers.
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.