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Choi Dongjin,Hahn Yoonsoo 한국미생물학회 2023 The journal of microbiology Vol.61 No.10
Potyvirids, members of the family Potyviridae, produce the P3N-PIPO protein, which is crucial for the cell-to-cell transport of viral genomic RNAs. The production of P3N-PIPO requires an adenine (A) insertion caused by RNA polymerase slippage at a conserved GAA AAA A ( GA6) sequence preceding the PIPO open reading frame. Presently, the slippage rate of RNA polymerase has been estimated in only a few potyvirids, ranging from 0.8 to 2.1%. In this study, we analyzed publicly available plant RNA-seq data and identified 19 genome contigs from 13 distinct potyvirids. We further investigated the RNA polymerase slippage rates at the GA6 motif. Our analysis revealed that the frequency of the A insertion variant ranges from 0.53 to 4.07% in 11 potyviruses (genus Potyvirus). For the two macluraviruses (genus Macluravirus), the frequency of the A insertion variant was found to be 0.72% and 10.96% respectively. Notably, the estimated RNA polymerase slippage rates for 12 out of the 13 investigated potyvirids were reported for the first time in this study. Our findings underscore the value of plant RNA-seq data for quantitative analysis of potyvirid genome variants, specifically at the GA6 slippage site, and contribute to a more comprehensive understanding of the RNA polymerase slippage phenomenon in potyvirids.
Bio-REF: Neutron reflectometer for investigation of bio-related thin films
Choi, Dongjin,Lee, Jumi,Phan, Minh Dinh,Hong, Kwang Pyo,Shin, Kwanwoo Elsevier 2018 PHYSICA B-CONDENSED MATTER - Vol.551 No.-
<P><B>Abstract</B></P> <P>A horizontal neutron reflectometer, Bio-REF, which is dedicated to the structural characterization of polymer and biological thin films and multilayers, has been commissioned at the 30 MW HANARO cold neutron reactor in Korea. The Bio-REF is a hybrid of horizontal and vertical scattering geometries, in which the sample is placed horizontally, and the specular reflectivity is mainly measured by the tilt of sample stage and a wide-range translating detector in θ ‒ 2θ mode. While the horizontal sample setup makes the instrument possible to conduct the measurements on a “free-liquid” system as well as mounting sophisticated sample environments, the θ ‒ 2θ operation allows to maintain the incident beam intensity and, together with the wide translational-length of the detector, the instrument is, therefore, capable of reaching a high <I>Q</I> ∼0.5 Å<SUP>−1</SUP>.</P>
최동진(Dongjin CHOI) 창조론오픈포럼 2019 창조론오픈포럼 Vol.13 No.2
There is a debate about the historical origin of Adam among Christians, and Christian worldviewers have similar voices or totally different understanding of creation and fall. This is because there is a spectrum of diverse interpretation and evaluation for the evidence of scientific accumulation of evolution. Therefore, in this article, we will look at the spectrum of the origin of human through examining the understanding of the origins of human by outstanding Christian worldviewers. First, Creation science theory is criticized as anti-scientific or similar science by denying radioactive dating, a scientific measurement method. Second, Old Adam Theory generally accepts radioactive dating, but basically does not accept that human has evolved from other apes. Third, Pre-Adamism claims that there were many people before Adam, and that Adam was only the first person with the image of God. Fourth, Theistic evolutionary theory holds that the method of creation of God in the beginning is the evolution, and that God led the process of evolution. It is important to understand that there are various understanding for the creation and fall in the Christian Worldview movement. Although they have different opinions, they can participate in the Christian Worldview movement in Jesus Christ.
Flower 연합학습 프레임워크를 활용한 통신 상황에 따른 학습 성능 평가 연구
최동진(Dongjin Choi),김준우(Junwoo Kim),이웅희(Woonghee Lee) 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.11
많은 주목을 받으며 빠르게 발전하고 있는 다양한 인공지능 학습 기술들은 수많은 데이터를 사용하여 학습을 수행하는데, 이를 위한 데이터들이 한곳에 모여 있는 경우보다 여러 장치들에 분산되어 저장되어있는 경우가 더욱 많다. 학습을 수행하기 위해 많은 데이터들을 한곳으로 모아야만 하는 한계를 극복하기 위해 연합학습이 제안되었으며, 연합학습이 작동하기 위해서는 서버와 참여 장치들간에 통신이 지속적으로 수행되어야 한다. 하지만 학습에 참여하는 모든 장치들의 통신 상황은 서로 다르며 지속적으로 변화하므로 이러한 통신 상황이 연합학습의 성능에 영향을 미치게 된다. 따라서 본 논문에서는 Flower 연합학습 프레임워크를 활용하여 테스트환경을 구축하였으며, 통신상황에 따른 시간 지연이 연합학습 성능에 영향을 미치는 것을 보였다.
핵심어 검출에 효과적인 Skip N - gram 언어 모델
최동진(Dongjin Choi),윤영선(Youngsun Yun),윤성진(Seong Jin Yun),오영환(Yung-Hwan Oh) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.1B
화자가 발성한 연속 음성에서 의미 있는 구간의 단어를 인식하는 핵심어 검출 시스템의 경우 단어수가 적고 그 순서가 중요하지 않을 때에는 음향학적 특성만을 이용하여 핵심어를 인식하게 된다. 그러나, 핵심어의 수가 증가하고, 그 순서가 인식 성능이나 사용 목적에 영향을 미칠 때에는 음향학적 분석만을 이용한 경우 좋은 성능을 발휘할 수 없다. 연속 음성에서 주로 사용하는 언어모델(N-gram)은 모든 단어에 대해 고려하고 있기 때문에, 핵심어 사이에 비핵심어(garbage)가 존재하는 핵심어 검출 시스템에 그대로 이용하기에는 많은 어려움이 따른다. 따라서 본 논문에서는 핵심어들간의 순서화 핵심어와 비핵심어를 동시에 고려하는 skip N-gram 언어모델을 제안한다. 실험결과 언어모델을 사용하지 않았을 경우 82.1%, bigram을 사용한 경우 83.4%의 문장 인식률을 보인 반면, 제안한 skip N-gram을 사용한 경우 96.9%의 인식률을 얻어 skip N-gram의 사용이 유효한 것으로 나타났다.
[동력전달계] 병렬형 하이브리드 차량의 동력전달계에 대한 Simulation
최동진(Dongjin Choi),이승종(Seungjoug Yi) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_2
In this paper, the performance of a hybrid vehicle powertrain including SI engine, clutch. continuously variable transmission, electric motor. and battery is conducted through computer simulation. The targer model is developed through dynamic equations, and look-up tables offered by manufacturer. The MatLab Simulink computer simulation program has been used to analyze the powel1rain performance and the fuel consumption characteristics of the system. A control strategy is suggested for the parallel hybrid vehicle using !he load leveling of the engine for ZEV and HEV drive modes, The simulation results show that the fuel consumption rate is extremely improved. This simulator can be used for powertrain design. performance analysis. and development of the control strategy of the parallel hybrid vehicle