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Comparison of Digital PCR and Quantitative PCR with Various SARS-CoV-2 Primer-Probe Sets
( Changwoo Park ),( Jina Lee ),( Zohaib Ul Hassan ),( Keun Bon Ku ),( Seong-jun Kim ),( Hong Gi Kim ),( Edmond Changkyun Park ),( Gun-soo Park ),( Daeui Park ),( Seung-hwa Baek ),( Dongju Park ),( Jih 한국미생물생명공학회(구 한국산업미생물학회) 2021 Journal of microbiology and biotechnology Vol.31 No.3
The World Health Organization (WHO) has declared the coronavirus disease 2019 (COVID-19) as an international health emergency. Current diagnostic tests are based on the reverse transcription-quantitative polymerase chain reaction (RT-qPCR) method, which is the gold standard test that involves the amplification of viral RNA. However, the RT-qPCR assay has limitations in terms of sensitivity and quantification. In this study, we tested both qPCR and droplet digital PCR (ddPCR) to detect low amounts of viral RNA. The cycle threshold (CT) of the viral RNA by RT-PCR significantly varied according to the sequences of the primer and probe sets with in vitro transcript (IVT) RNA or viral RNA as templates, whereas the copy number of the viral RNA by ddPCR was effectively quantified with IVT RNA, cultured viral RNA, and RNA from clinical samples. Furthermore, the clinical samples were assayed via both methods, and the sensitivity of the ddPCR was determined to be equal to or more than that of the RT-qPCR. However, the ddPCR assay is more suitable for determining the copy number of reference materials. These findings suggest that the qPCR assay with the ddPCR defined reference materials could be used as a highly sensitive and compatible diagnostic method for viral RNA detection.
Changwoo Jeon,Min Chul Jo,Juho Lee,Eun Soo Park,Junho Park,Sang Yong Shin 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.8
Zr-based bulk amorphous alloys which were heat-treated from 673 to 1073 K were investigated, and compressive fracturemechanisms related with improvement of mechanical properties were investigated by observing how the type, size and volumefraction of crystalline particles which is generated during the heat treatment affected the fracture mode. The Zr-based bulkamorphous alloys contained nano-sized crystalline particles showed excellent mechanical properties of compressive fracturestrength over 2.0 GPa and compressive plastic strain of approximately 1%. The fracture modes of the alloys are changeddepending on the heat treatment temperature and their microstructure. When the alloy is heat-treated at 673 K, the nanosizedZr2Cuparticles are generated in amorphous matrix. According to the observation of fractured specimens, in the alloyheat-treated at 673 K, the fine and elongated vein patterns were well developed. The heat treatment temperature increasedabove Tx,the Zr2Cuparticles as well as complex crystalline particles are consist in the heat-treated alloy, which lead to thebrittle fracture and the alloy show the low strength of 605 MPa. In the fractured surface of the alloy, large cleavage facetswere evenly developed. When the heat treatment temperature up near Tm,the size of Zr2Cuand complex crystalline particlesincreased to approximately 1 μm and the volume fraction of complex crystalline particles increased up to 52.3%. As the sizeof crystalline particles change, the size of facet decreased similarly to the size of crystalline particles.
Performance Analysis of a New Preamble-Based SNR Estimation Algorithm
SEO, Changwoo,CHO, Insik,PORTUGAL, Sherlie,PARK, Jaeho,PARK, Gihwan,JUNG, Taejin,HWANG, Intae,LIU, Huaping,YOU, Cheolwoo The Institute of Electronics, Information and Comm 2011 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.eb94 No.5
<P>In recent years, techniques such as multiple input multiple output (MIMO) and orthogonal frequency division multiplexing (OFDM) have been developed and combined in MIMO-OFDM systems to provide higher data rates. In addition, the system can be optimized by setting modulation and coding adaptively according to the channel conditions. The overall system performance depends on how accurately the system obtains the channel state information (CSI) and feeds it back to the transmitter. In this paper, we propose a signal-to-noise-ratio (SNR) estimation algorithm in which the preamble is known by both sides of the transceiver. Through simulations of several channel environments, we prove that our proposed algorithm is more accurate than traditional algorithms.</P>
3D맵을 고려한 적응형 순항 제어 시스템의 연비 향상 알고리즘 연구
박창우(Changwoo Park),전남주(Namju Jun),염재열(Jaeyeol Yeom),이형철(Hyeongcheol Lee) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
This paper presents an optimal driving control algorithm for vehicle efficiency on the road via 3D Map and ADAS (Advanced Driving Assistance System). The algorithm controls vehicle velocity to against waste energy by using brake pedal where curve path, downward slope and detecting forward vehicle. By previous study, the optimal vehicle velocity is obtained on curve and slope path. In this study, Limit vehicle speed for economic driving is suggested on whole driving path with 3D map data. Also the coasting operation data is based on vehicle field test. This algorithm is simulated using CarSim® simulator with 3D Map and other driving vehicles. Also the proving vehicle is used for verifying its effectiveness.
적응형 순항 제어 시스템의 전방 차량 접근 방법에 관한 연구
박창우(Changwoo Park),김순오(Soonoh Kim),이형철(Hyeongcheol Lee) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
This paper presents an economic adaptive cruise control algorithm for vehicle efficiency on ADAS (Advanced Driving Assistance System). The algorithm controls vehicle velocity to against waste energy by using brake pedal where detecting forward vehicle. By previous study, adaptive cruise control systems are focused on the performance. In this study, coasting operation distance to target vehicle is suggested with radar sensor or others. Also the coasting operation data is based on vehicle field test. This algorithm is simulated using CarSim® simulator with other driving vehicles for verifying its effectiveness.