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Sunghyun Cho(조성현) 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.6
To overcome physical limitations of traditional cameras and enable new imaging applications, computational photography has emerged. Computational photography combines photography with computational algorithms such as image processing, computer vision, and graphics algorithms. Suh computational photography algorithms have significantly expanded the capability of camera. This paper provides a review of some of our past research projects in computational photography including image/video deblurring, lowering the barrier of capturing photographs, and understanding images and users. This paper also presents possible future directions.
A practical transmit beamforming strategy for closed‐loop MIMO communication
Cho, Sunghyun,Hwang, Insoo,Tarokh, Vahid,You, Cheolwoo John Wiley Sons, Ltd 2012 International Journal of Communication Systems Vol.25 No.8
<P><B>SUMMARY</B></P><P>A new beamforming strategy is proposed for multiuser systems with <I>N</I> transmit antennas at the transmitter and <I>M ⩽ N</I> single antenna receivers. The proposed scheme remarkably improves on the classical spatial division multiple access, and achieves the same data rates as spatial multiplexing for all users but with significantly superior performance/diversity gain. When compared with the Bell labs layered space–time system, the symbol rate is the same and the performance is much superior because of the presence of diversity gain. In addition, unlike the Bell labs layered space–time system, the receivers do not need to know each other's vector channels. Finally, the proposed algorithm is based on dirty‐paper coding, but does not require much complexity and is implementable. Copyright © 2011 John Wiley & Sons, Ltd.</P>
Sunghyun Kim,Jang-Eun Cho,Hyunjung Kim,Dongsup Lee,Bo-young Jeon,Hyejon Lee,Sang-Nae Cho,Young Keun Kim,Hyeyoung Lee 대한의생명과학회 2013 Biomedical Science Letters Vol.19 No.2
The tuberculin skin test (TST) and interferon gamma (IFN-γ) release assay (IGRA) have been widely used for diagnosis of latent tuberculosis infection (LTBI). In order to overcome limitations of current LTBI diagnostic methods, the development of a novel molecular assay which is able to measure the IFN-γ messenger RNA (mRNA) expression level after stimulation with Mycobacterium tuberculosis (MTB) specific antigen was recently developed. The ability of a molecular assay to detect MTB infection was similar to commercial IGRA however, the optimal incubation time for stimulating IFN-γ was not yet established. Therefore, in this study the direct comparisons of MTB Ag stimulation times (4 and 24 hrs) were performed for diagnosis of MTB infection. Data showed that the coincident rate between QFT-GIT IFN-γ ELISA and IFN-γ RT-PCR (4 hrs) was 88.35% and that of QFT-GIT and IFN-γ RT-PCR (24 hrs) was 70.85%. Based on a receiver operating characteristic (ROC) curve, the 4 hrs-MTB specific Ag stimulation time for IFN-γ RT-PCR had the significant P value, 95% CI value, and AUC (P < 0.0001, 95% CI=0.82 to 1.02, and AUC=0.9214) in comparison with 24 hrs-MTB specific Ag stimulation time (P = 0.009, 95% CI=0.06 to 0.94, and AUC=0.7711). These results show that 4-hr was the most optimal MTB Ag stimulation time for performing IFN-γ RT-PCR. Although semi-quantitative RT-PCR had a few analytical limitations, it might be useful as an alternative molecular diagnostic method for detecting MTB infection.
Multichannel Random Access Protocol with Capture Effect for Cellular Relaying Networks
CHO, Sunghyun,JUNG, Young-Ho,YOU, Cheolwoo The Institute of Electronics, Information and Comm 2010 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.93 No.11
<P>This paper proposes a stabilized multichannel random access protocol based on slotted ALOHA for relay deployed cellular networks. To ensure the stability of random access, the proposed protocol dynamically controls the number of random access channels in a BS and a RS and the retransmission probability of the random access packets under heavy load conditions. A mathematical formula is also developed that derives an optimal partition ratio of the shared random access channels between a base station and a relay station without and with capture effect. Numerical results show that the proposed protocol can guarantee the required utilization and delay even in high offered load, which otherwise can cause bistable problem of slotted ALOHA.</P>