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Jeon, Younghyun,Song, Changick,Lee, Sang-Rim,Maeng, Seungjoo,Jung, Jaehoon,Lee, Inkyu IEEE 2017 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.16 No.5
<P>In this paper, we study a joint spatial division multiplexing (JSDM) beamforming scheme, which enables large-scale spatial multiplexing gains for massive multi-input multi-output downlink systems. In contrast to the conventional JSDM, which employs a block diagonalization method as a pre-beamformer, we aim to maximize sum-rate by applying minimum-mean-squared error (MMSE) approaches when designing a pre-beamformer and a multi-user precoder sequentially. First, to suppress inter-group interference, we design the pre-beamformer, which minimizes an upper bound of the sum mean-squared-error in the large-scale array regime. Then, to mitigate same-group interference, we present the multi-user precoder based on the weighted MMSE (WMMSE) optimization method, which requires the same channel state information overhead as the conventional JSDM. Also, in order to reduce the computational complexity, we compute deterministic equivalents of the WMMSE beamforming parameters to generate the beam-formers by employing asymptotic results of large system analysis. Through simulation results, we confirm that the proposed two-step beamforming methods bring substantial performance gains in terms of sum-rate over the conventional JSDM schemes especially in a low and medium signal-to-noise ratio regime with comparable complexity.</P>
Transmit Power Optimization for Cooperative Beamforming in Uplink MIMO Ad-hoc Networks
Younghyun Jeon,Seungjoo Maeng 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.1
In Ad-hoc networks, one great interest is its combination with multiple-input multiple-output (MIMO) transmission techniques. On this work, we consider a specific type of Ad-hoc networks called reverse-link MIMO Ad-hoc network (RMAN) and maximize the data rate with a power consumption constraint using cooperative beamforming techniques. Based on mathematical analysis, we design an algorithm which constructs optimal orthogonal weight vectors according to channel feedback and controls the transmission power according to a QoS-pricing value level. In simulation results, we show the validity of the analysis and the data rate performance of our proposed algorithm. We also show that the data rate of each link converges to a stationary point.
Modified submental intubation techniques for maxillofacial surgery - A report of five cases -
Jeon Yeong-gwan,Lee Chunui,Hong Dongeui,Jin Younghyun,임현교 대한마취통증의학회 2022 Anesthesia and pain medicine Vol.17 No.3
Background Submental intubation has been the recommended airway management procedure for maxillofacial surgery since proposed by Altemir in 1986. We adopted various submental intubation modifications based on modified intubation protocols and report on the effectiveness and problems of each modified method.Case Among a total of 13 submental intubation cases during the last five years, five representative methods are described. The proximal end of the endotracheal tube was protected by a nelaton catheter in case 1, by a suction connector in case 2, and by a dental needle cap in case 3. In case 4, a nasal speculum was used to expand a single route, and in case 5, a laparoscopic trocar was used to secure a single route.Conclusions Use of a laparoscopic trocar might be the most effective way to obtain a single submental route. However, considering cost, use of a nasal speculum is also an effective suboptimal solution.
Jeon, Byoungil,Kim, Jongyul,Lim, Kiseo,Choi, Younghyun,Moon, Myungkook The Korean Association for Radiation Protection 2017 방사선방어학회지 Vol.42 No.4
Background: This study aims to calculate detector positions as a design of a radioactive source localizing radiation portal monitor (RPM) system using an improved genetic algorithm. Materials and Methods: To calculate of detector positions for a source localizing RPM system optimization problem is defined. To solve the problem, a modified iterative genetic algorithm (MIGA) is developed. In general, a genetic algorithm (GA) finds a globally optimal solution with a high probability, but it is not perfect at all times. To increase the probability to find globally optimal solution rather, a MIGA is designed by supplementing the iteration, competition, and verification with GA. For an optimization problem that is defined to find detector positions that maximizes differences of detector signals, a localization method is derived by modifying the inverse radiation transport model, and realistic parameter information is suggested. Results and Discussion: To compare the MIGA and GA, both algorithms are implemented in a MATLAB environment. The performance of the GA and MIGA and that of the procedures supplemented in the MIGA are analyzed by computer simulations. The results show that the iteration, competition, and verification procedures help to search for globally optimal solutions. Further, the MIGA is more robust against falling into local minima and finds a more reliably optimal result than the GA. Conclusion: The positions of the detectors on an RPM for radioactive source localization are optimized using the MIGA. To increase the contrast of the measurements from each detector, a relationship between the source and the detectors is derived by modifying the inverse transport model. Realistic parameters are utilized for accurate simulations. Furthermore, the MIGA is developed to achieve a reliable solution. By utilizing results of this study, an RPM for radioactive source localization has been designed and will be fabricated soon.
권영현(YoungHyun Kwon),이태우(Taewoo LEE),배지수(Jisu Bae),이수영(Suyoung Lee),박세인(Sein Park),강준구(Jungu Kang),전태완(Taewan Jeon) 한국환경에너지공학회 2023 한국열환경공학회 학술대회지 Vol.2023 No.2
‘23년 6월 환경부는 종량제봉투에 담긴 생활폐기물을 선별이나 소각 없이 매립하는 행위를 금지하는 폐기물관리법 시행규칙을 공포하였다. 수도권 3개 시 · 도는 2026년부터, 수도권 이외 지역은 2030년부터 직매립 금지를 시 행한다. 종량제 쓰레기는 선별해서 재활용하거나 소각한 후 소각재만 매립해야 된다. 이처럼 생활폐기물 직 매립 금지에 따라 폐기물소각 시설은 보다 중요한 역할을 담당하게 되었다. 폐기물 발생량이 중가하고 있는 경제적 · 사회적 구조를 고려할 때 자원순환사회 실현을 위하여 폐 기물소각시설은 반드시 필요한 시설임에 틀림없다. ‘2018년 「자원순환기본법」 을 기본으로 하위 제도로써 폐기물처분 부담금 제도를 시행중이며, 재활용이 가능한 폐 기물을 매립 · 소각 등의 방법으로 처리할 경우 부담금을 부과하여 재활용을 유도하는 제도이 다. 반면, 단순 소각을 지양하고 소각 시 발생되는 열에너지를 최대한 회 수 · 이용하는 시설에 한하여 ‘에너지 회수효율 검 · 인증 제도’을 통해 인중서 를 발급(국립환경과학원)하고, 이에 따라 부담금을 감면(최대 75%) 해주는 제도를 운영중에 있다. 그간에 에너지 회수효율 검 · 인증 제도를 운영하며 논의된 다양한 사례들을 정리하여 관련 업무의 편의성을 확보하고자 한다.
Kim, Younghyun,Lee, Goeun,Jeon, Eunhyun,Sohn, Eun ju,Lee, Yongjik,Kang, Hyangju,Lee, Dong wook,Kim, Dae Heon,Hwang, Inhwan Oxford University Press 2014 Nucleic acids research Vol.42 No.1
<P>The nucleotide sequence around the translational initiation site is an important <I>cis</I>-acting element for post-transcriptional regulation. However, it has not been fully understood how the sequence context at the 5′-untranslated region (5′-UTR) affects the translational efficiency of individual mRNAs. In this study, we provide evidence that the 5′-UTRs of Arabidopsis genes showing a great difference in the nucleotide sequence vary greatly in translational efficiency with more than a 200-fold difference. Of the four types of nucleotides, the A residue was the most favourable nucleotide from positions −1 to −21 of the 5′-UTRs in <I>Arabidopsis</I> genes. In particular, the A residue in the 5′-UTR from positions −1 to −5 was required for a high-level translational efficiency. In contrast, the T residue in the 5′-UTR from positions −1 to −5 was the least favourable nucleotide in translational efficiency. Furthermore, the effect of the sequence context in the −1 to −21 region of the 5′-UTR was conserved in different plant species. Based on these observations, we propose that the sequence context immediately upstream of the AUG initiation codon plays a crucial role in determining the translational efficiency of plant genes.</P>
Inhibition of KIF20A suppresses the replication of influenza A virus by inhibiting viral entry
Hoyeon Jeon,Younghyun Lim,In-Gu Lee,Dong-In Kim,Keun Pil Kim,So-Hee Hong,Jeongkyu Kim,Youn-Sang Jung,Young-Jin Seo 한국미생물학회 2022 The journal of microbiology Vol.60 No.11
The influenza A virus (IAV) has caused several pandemics, and therefore there are many ongoing efforts to identify novel antiviral therapeutic strategies including vaccines and antiviral drugs. However, influenza viruses continuously undergo antigenic drift and shift, resulting in the emergence of mutated viruses. In turn, this decreases the efficiency of existing vaccines and antiviral drugs to control IAV infection. Therefore, this study sought to identify alternative therapeutic strategies targeting host cell factors rather than viruses to avoid infection by mutated viruses. Particularly, we investigated the role of KIF20A that is one of kinesin superfamily proteins in the replication of IAV. The KIF20A increased viral protein levels in IAV-infected cells by regulating the initial entry stage during viral infection. Furthermore, the KIF20A inhibitor significantly suppressed viral replication, which protected mice from morbidity and mortality. Therefore, our findings demonstrated that KIF20A is highly involved in the viral replication process and viral propagation both in vitro and in vivo, and could thus be used as a target for the development of novel antiviral drugs.