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Hongjun Dong 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.6
Composite CaAl2O4-2CaAl4O7 : Re3+ (Re3+ = Tb3+, Sm3+) phosphors were prepared by the SPCS technique, which were studied via XRD, SEM, FT-IR spectra and luminescent spectra. The results show that the crystal lattice structure of them needs slight distortion to improve luminescence properties. They exhibit wider near-UV excitation band around 380 nm. Upon exciting with 380 nm, CaAl2O4-2CaAl4O7 : Tb3+ shows a strong green-light at 548 nm corresponding to a 5D4→7F5 transition of Tb3+ ions,and CaAl2O4-2CaAl4O7 : Sm3+ presents strong red-light at 604 nm corresponding to a 4G5/2→6H7/2 transition of Sm3+ ions. The product fired at 900 oC exhibit high quality crystallinity and with a size of that is approximately 1-3 μm. All the above characteristics of the products are beneficial for phosphors for white LEDs.
( Hongjun Li ),( Feihong Dong ),( Xiangwu Gong ),( Changliang Deng ),( Luliang Jia ),( Jingchao Wang ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.6
This paper investigates an efficient transmission scheme for the remote wireless sensors to receive information which is rarely discussed in the integrated remote wireless sensor and multibeam satellite networks (IWSMSNs). The networks can be employed to exchange sensing information for emergency scenario, ocean scenario, and so on, which are isolated from available terrestrial networks. As the efficient transmission link is important to the IWSMSNs, we propose a hybrid full frequency (HFF) precoding by taking advantage of frequency reuse and multiple-input multiple-output (MIMO) precoding. Considering energy efficiency and sinks fairness are crucial to transmission link, thus the HFF precoding problems are formulated as transmit power minimization (TPM) and max-min fair (MMF) received signal to interference plus noise ratio (SINR) problems, which can be transformed to indefinite quadratic optimization programs. Then this paper presents a semi-definite programming (SDP) algorithm to solve the problems for the IWSMSNs. The promising potential of HFF for the real IWSMSNs is demonstrated through simulations.
VR 사용자의 멀미 최소화를 위한 컨트롤러 모션 기반 이동 연구
최홍준(Hongjun Choi),고정운(Jung-Woon Ko),이동엽(Dong-Yeop Lee),경병표(Byung-Pyo Kyung) 한국HCI학회 2019 한국HCI학회 학술대회 Vol.2019 No.2
VR 시장은 매년 거대한 성장폭을 가지며 시장규모가 확대 되며 다양한 VR 장비들이 등장을 하였으나 VR 장비들은 크게 대중화에는 실패하고 있는게 실정이다. 이는 대다수 사용자가 VR 경험에서 멀미를 호소 하고 이 멀미로 하여금 VR 컨텐츠를 접하는 것을 꺼려하기 때문이다. VR 업계에서는 이를 해결하기 위해 다양한 방법으로 시도를 하고 있으나 가장 대표적인 원인인 감각갈등이론에 포커스를 맞추어 VR체험 시 실제 경험과 사용자가 보는 경험에 이질감을 없애기 위해 더욱더 큰 장비를 사용하고 있는게 현실이다 그러나 이러한 기계들은 일반 사용자가 사용하기 에는 비용적인문제와 공간적인 문제가 있다. 본 논문에서는 HTC VIVE 를 사용하여 제작한 게임컨텐츠 “5Floor”에 적용한 컨트롤러 모션기반의 이동방법으로 감각갈등이론 을 해결 하였고 이는 최소한의 공간으로 사용자에게 멀미를 줄이는 효율적인 것으로 확인하였다.
Jeon, Hongjun,Bae, Hoon,Baek, Dong Jae,Kwak, Young-Shin,Kim, Deukjoon,Kim, Sanghee Royal Society of Chemistry 2011 Organic & biomolecular chemistry Vol.9 No.20
<P>Bioisosteric analogues of pachastrissamine that contain sulfur and selenium atoms replacing the oxygen in the ring system, were efficiently prepared from a cyclic sulfate intermediate by sequential intermolecular and intramolecular S<SUB>N</SUB>2 displacement reactions of the dianions. The analogues exhibited cytotoxicities comparable to that of pachastrissamine.</P> <P>Graphic Abstract</P><P>Sulfur and selenium containing bioisosteric analogues of pachastrissamine were prepared from a 7-membered cyclic sulfate intermediate by sequential intermolecular and intramolecular S<SUB>N</SUB>2 displacement reactions. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1ob05920c'> </P>
Robust Cooperative Relay Beamforming Design for Security
( Xiangwu Gong ),( Feihong Dong ),( Hongjun Li ),( Wei Shao ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.11
In this paper, we investigate a security transmission scheme at the physical layer for cooperative wireless relay networks in the presence of a passive eavesdropper. While the security scheme has been previously investigated with perfect channel state information(CSI) in the presence of a passive eavesdropper, this paper focuses on researching the robust cooperative relay beamforming mechanism for wireless relay networks which makes use of artificial noise (AN) to confuse the eavesdropper and increase its uncertainty about the source message. The transmit power used for AN is maximized to degrade the signal-to-interference-plus-noise-ratio (SINR) level at the eavesdropper, while satisfying the individual power constraint of each relay node and worst-case SINR constraint at the desired receiver under a bounded spherical region for the norm of the CSI error vector from the relays to the destination. Cooperative beamforming weight vector in the security scheme can be obtained by using S-Procedure and rank relaxation techniques. The benefit of the proposed scheme is showed in simulation results.