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Kim, Sungchul,Lee, Sanghyun,Shin, Jinwook,Kim, Youngkyun,Evnouchidou, Irini,Kim, Donghyun,Kim, Young-Kook,Kim, Young-Eui,Ahn, Jin-Hyun,Riddell, Stanley R,Stratikos, Efstratios,Kim, V Narry,Ahn, Kwangs Nature Publishing Group, a division of Macmillan P 2011 NATURE IMMUNOLOGY Vol.12 No.10
Major histocompatibility complex (MHC) class I molecules present peptides on the cell surface to CD8<SUP>+</SUP> T cells, which is critical for the killing of virus-infected or transformed cells. Precursors of MHC class I??presented peptides are trimmed to mature epitopes by the aminopeptidase ERAP1. The US2??US11 genomic region of human cytomegalovirus (HCMV) is dispensable for viral replication and encodes three microRNAs (miRNAs). We show here that HCMV miR-US4-1 specifically downregulated ERAP1 expression during viral infection. Accordingly, the trimming of HCMV-derived peptides was inhibited, which led to less susceptibility of infected cells to HCMV-specific cytotoxic T lymphocytes (CTLs). Our findings identify a previously unknown viral miRNA??based CTL-evasion mechanism that targets a key step in the MHC class I antigen-processing pathway.
Sunjin Yim,Sungchul Kim,Inhwan Kim,Jae-Woo Park,Jin-Hyoung Cho,Mihee Hong,Kyung-Hwa Kang,Minji Kim,Su-Jung Kim,Yoon-Ji Kim,Young Ho Kim,Sung-Hoon Lim,Sang Jin Sung,Namkug Kim,Seung-Hak Baek 대한치과교정학회 2022 대한치과교정학회지 Vol.52 No.1
Objective: The purpose of this study was to investigate the accuracy of one-step automated orthodontic diagnosis of skeletodental discrepancies using a convolutional neural network (CNN) and lateral cephalogram images with different qualities from nationwide multi-hospitals. Methods: Among 2,174 lateral cephalograms, 1,993 cephalograms from two hospitals were used for training and internal test sets and 181 cephalograms from eight other hospitals were used for an external test set. They were divided into three classification groups according to anteroposterior skeletal discrepancies (Class I, II, and III), vertical skeletal discrepancies (normodivergent, hypodivergent, and hyperdivergent patterns), and vertical dental discrepancies (normal overbite, deep bite, and open bite) as a gold standard. Pre-trained DenseNet-169 was used as a CNN classifier model. Diagnostic performance was evaluated by receiver operating characteristic (ROC) analysis, t-stochastic neighbor embedding (t-SNE), and gradientweighted class activation mapping (Grad-CAM). Results: In the ROC analysis, the mean area under the curve and the mean accuracy of all classifications were high with both internal and external test sets (all, > 0.89 and > 0.80). In the t-SNE analysis, our model succeeded in creating good separation between three classification groups. Grad-CAM figures showed differences in the location and size of the focus areas between three classification groups in each diagnosis. Conclusions: Since the accuracy of our model was validated with both internal and external test sets, it shows the possible usefulness of a one-step automated orthodontic diagnosis tool using a CNN model. However, it still needs technical improvement in terms of classifying vertical dental discrepancies.
Sungchul Kim,Yongwoo Jeon,Je-Hun Lee,Byung Du Ahn,Sei Yong Park,Jun-Hyun Park,Joo Han Kim,Jaewoo Park,Dong Myong Kim,Dae Hwan Kim IEEE 2010 IEEE electron device letters Vol.31 No.11
<P>The relation between the low-frequency noise (LFN) and subgap density of states (DOS) of amorphous InGaZnO (a-IGZO) thin-film transistors (TFTs) is investigated by changing the postannealing temperature from 150°C to 300°C. It is found that the density of the tail states in the TFT annealed at 300°C (showing the lowest LFN) is prominently lower than those in the TFTs annealed at 250°C and 150°C. The densities of the tail states in the TFTs annealed at 250°C and 150°C (indicating similar LFN) are almost the same. In addition, it is clearly observed that the increased DOS of the a-IGZO TFT subjected to ac gate voltage stress results in a higher LFN compared with one without electrical stress. Hooge's parameters α<I>H</I>'s are extracted to be ~4.5 × 10<SUP>-3</SUP> (for the TFT annealed at 300°C) and ~1 × 10<SUP>-2</SUP> (for the TFTs annealed at 25°C and 150°C as well as for the TFT annealed at 300°C after the application of electrical ac stress). Therefore, the role of an a-IGZO subgap DOS on a LFN characteristic seems to be originated from the generation-recombination noise-induced carrier number fluctuation (via trap centers in the DOS tail states) while its correlation with the carrier mobility fluctuation is not clear except for the slope close to -1 in the logarithmic curve with the normalized power spectral density versus the gate overdrive voltage.</P>
Kim Sungchul,Cho Sungman,Cho Kyungjin,Seo Jiyeon,Nam Yujin,Park Jooyoung,Kim Kyuri,Kim Daeun,Hwang Jeongeun,Yun Jihye,Jang Miso,Lee Hyunna,김남국 대한영상의학회 2021 Korean Journal of Radiology Vol.22 No.12
Deep learning-based applications have great potential to enhance the quality of medical services. The power of deep learning depends on open databases and innovation. Radiologists can act as important mediators between deep learning and medicine by simultaneously playing pioneering and gatekeeping roles. The application of deep learning technology in medicine is sometimes restricted by ethical or legal issues, including patient privacy and confidentiality, data ownership, and limitations in patient agreement. In this paper, we present an open platform, MI2RLNet, for sharing source code and various pre-trained weights for models to use in downstream tasks, including education, application, and transfer learning, to encourage deep learning research in radiology. In addition, we describe how to use this open platform in the GitHub environment. Our source code and models may contribute to further deep learning research in radiology, which may facilitate applications in medicine and healthcare, especially in medical imaging, in the near future. All code is available at https://github.com/mi2rl/MI2RLNet.
코사인 유사도 기법을 이용한 top-k관련쌍 검색 방법 조사
김성철 ( Sungchul Kim ),김정환 ( Jeong-hwan Kim ),김나영 ( Na-yeong Kim ),김태훈 ( Taehoon Kim ),유환조 ( Hwanjo Yu ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.1
유사도 검색은 전통적으로 데이터베이스 그리고 웹검색 분야의 핵심이었으나, 대용량 데이터의 등장으로 검색의 정확도뿐만이 아니라 효율성 측면에서의 요구가 증가하며 여전히 다양한 분야에서 활발히 연구되고 있다. 아이템간의 유사도를 측정하기 위한 방법론 중 코사인 유사도 방법론은 고차원공간에서의 활용이 유리하다는 이점때문에 가장 널리 활용되고 있는 방법론으로, 정보검색, 장바구니 분석, 생물정보학 등 다양한 분야에서 활용되고 있다. 본 논문에서는 코사인 유사도를 소개 하고, 연관성 분석 측면에서 코사인 유사도를 사용한 기존의 연구들을 소개한다.
Analysis of a Fully Matched Saturated Doherty Amplifier With Excellent Efficiency
Jangheon Kim,Junghwan Moon,Young Yun Woo,Sungchul Hong,Ildu Kim,Jungjoon Kim,Bumman Kim IEEE 2008 IEEE transactions on microwave theory and techniqu Vol.56 No.2
<P>A saturated Doherty amplifier based on class-F amplifiers is analyzed in terms of its load modulation behavior, efficiency, and linearity. Simulations included the amplitude ratio and phase difference between the fundamental and third harmonic voltages, the current/voltage waveforms, load lines, and the third-order intermodulation amplitudes/phases of the carrier and peaking amplifiers. The saturated doherty power amplifier was implemented using two Eudyna EGN010MK GaN HEMTs with a 10-W peak envelope power. For a 2.14-GHz forward-fink wideband code-division multiple-access signal, the doherty amplifier delivers an excellent efficiency of 52.4% with an acceptable linearity of -28.3 dBc at an average output power of 36 dBm. Moreover, the amplifier can provide the high linearity performance of -50 dBc using the digital feedback predistortion technique.</P>
Dae Hwan Kim,Yong Woo Jeon,Sungchul Kim,Yongsik Kim,Yun Seop Yu,Dong Myong Kim,Hyuck-In Kwon IEEE 2012 IEEE electron device letters Vol.33 No.1
<P>In this letter, we show that the physics-based equation that was derived for amorphous oxide semiconductor (AOS) thin-film transistors (TFTs) in our previous work can be successfully incorporated into the SPICE model via Verilog-A. The proposed model and extracted SPICE parameters successfully reproduce the measured current-voltage characteristics of amorphous indium-gallium-zinc-oxide (a-IGZO) TFTs and the load line diagram of a-IGZO TFT inverters. The main advantage of our model is that each parameter has its physical meaning and most of them can be related with the fabrication conditions of AOS TFTs. To show the advantage of the proposed models and extracted SPICE parameters more clearly, we investigate the effect of ionized donor concentration (<I>N</I><SUB>D</SUB><SUP>+</SUP>) on the inverter circuit operation and determine the optimum value of <I>N</I><SUB>D</SUB><SUP>+</SUP> and device dimensions considering the tradeoff between the power consumption and the output swing in a-IGZO inverters. The proposed physics-based SPICE model via Verilog-A is expected to play a significant role in the process optimization and circuit design with AOS TFTs.</P>
Subgap Density-of-States-Based Amorphous Oxide Thin Film Transistor Simulator (DeAOTS)
Yong Woo Jeon,Sungchul Kim,Sangwon Lee,Dong Myong Kim,Dae Hwan Kim,Jaechul Park,Chang Jung Kim,Ihun Song,Youngsoo Park,U-In Chung,Je-Hun Lee,Byung Du Ahn,Sei Yong Park,Jun-Hyun Park,Joo Han Kim IEEE 2010 IEEE transactions on electron devices Vol.57 No.11
<P>The amorphous oxide thin-film transistor (TFT)-oriented simulator [subgap Density of states (DOS)-based Amorphous Oxide TFT Simulator (DeAOTS)] is proposed, implemented, and demonstrated for amorphous indium-gallium-zinc-oxide (a-IGZO) TFTs. It only consists of parameters having their physical meanings and is supplied with concrete techniques for parameter extraction. Among the physical parameters, the acceptor-like DOS <I>gA</I>(<I>E</I>) was experimentally extracted using the multifrequency <I>C</I>-<I>V</I> technique, whereas the donor-like DOS <I>gD</I>(<I>E</I>) and the doping concentration <I>ND</I> were extracted using numerical iterations. The simulation result reproduces the DOS and thin-film-thickness-dependence of dc <I>I</I>-<I>V</I> characteristics very well. Compared with the previously reported a-Si TFT models, the proposed DeAOTS model not only reflects the strong <I>V</I><SUB>GS</SUB> dependence of the effective mobility (μ<SUB>eff</SUB>) but also clarifies the relations between process-controlled DOS parameters and dc <I>I</I>- <I>V</I> characteristics based on experimentally extracted DOS parameters. Also, it sufficiently takes into account the peculiar situation of amorphous oxide TFTs where the free-carrier charge can be larger than the localized one out of the total induced charge. Moreover, it reproduces the measured electrical characteristics within the wide range of <I>V</I><SUB>GS</SUB>/<I>V</I><SUB>DS</SUB> with a single equation, not distinguishing the operation regions such as the subthreshold, linear, and saturation regimes.</P>
적수온(21℃)에서 사육한 성장기 넙치 (Paralichthys olivaceus)의 배합사료 적정 공급률
김성삼(Sung-Sam KIM),김강웅(Kang-Woong KIM),김경덕(Kyoung-Duck KIM),이봉주(Bong-Joo LEE),한현섭(Hyon-Sob HAN),김재원(Jae-Won KIM),배승철(Sungchul C. BAI),이경준(Kyeong-Jun LEE) 한국수산해양교육학회 2014 水産海洋敎育硏究 Vol.26 No.4
This study was conducted to investigate the effects of feeding rate on growth performance, blood components and histology of growing olive flounder. The experiment was carried out to determine the optimum feeding rate of the fish (initial fish mean weight of 97±3.0 g) at the optimum water temperature. Two replicated groups of fish were fed commercial diet at the feeding rates of 0, 1.0, 1.65 and 2.3% body weight (BW)/day and satiation. Feeding trial was conducted under a flow-through system with ten 1.2 metric ton aquaria receiving filtered seawater at 21±2℃ for three weeks. Weight gain and specific growth rate (SGR) for fish fed to satiation were significantly higher than those for the unfed fish and for fish fed at 1.0 and 1.65% BW/day. There were no significant differences in values of such parameters between fish fed at 1.65% and those fed at 2.3% BW/day and between fish fed at 2.3% and those fed to satiation. Weight gain and SGR for the unfed fish were significantly lower than those for fish in the other treatments. All the tissues (hepatopancreas, kidney and anterior intestine) were in good condition in fish fed the experimental diet at different feeding rates. This result indicates that the optimum feeding rates of olive flounder (97-160 g) was approximately 2.52% BW/day at the optimum water temperature.