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Gun Li,Binxia Du,Yong Cao,Feijiang Huang 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.2
In response to the influence of calibration parameter on measurement accuracy of characteristic impedance tester, the paper comes up with a perfect calibration method of two points based on waveform average and the optimal measuring region. The method is based on calibration method of two points. First, waveform average can reduce random errors in the testing process of characteristic impedance tester. Second, automatically selection for the optimal measuring region can reach a high precision. Last, each tube has a separate calibration parameter, increasing its consistency and Independence, which implement highly calibration for the tester. Making an integrated comparison of testing results among three algorithms, including Tektronix instrument and original method of two-point calibration, validates the accuracy of new algorithm. The method was put into the design of characteristic impedance tester using advanced measurement accuracy.
Relative synonymous codon usage of ORF1ab in SARS-CoV-2 and SARS-CoV
Li Gun,Zhang Liang,Du Ning 한국유전학회 2021 Genes & Genomics Vol.43 No.11
Background COVID-19, as a novel coronavirus disease caused by new coronavirus SARS-CoV-2, spreads all over the world, and brings harm to human in many countries. Humans sufered a lot from both SARS-CoV-2 now and by SARS-CoV in the year 2003. It is important to understand the diferences and the relationships between these two types of viruses. Objective To compare relative synonymous codon usage of ORF1ab gene in SARS-CoV-2 and SARS-CoV, relative synonymous codon usage of their genomes are studied in this paper from the bioinformatics perspective. Methods The ORF1ab gene, which is an important non-structural polyprotein coding gene and now used for nucleic acid detection markers in many measurement method, in both SARS-CoV-2 (30 strains) and SARS-CoV (20 strains) are considered to be the research object in the present paper. The relative synonymous codon usage values of the ORF1ab gene are calculated to characterize the diferences and the evolutionary characteristics among 50 strains. Results There is a signifcant diference between SARS-CoV and SARS-CoV-2 when the relative synonymous codon usage value of ORF1ab genes is concerned. The results suggest that codon usage pattern of SARS-CoV is more similar to human than that of the SARS-CoV-2, and that the inner diference in SARS-CoV-2 strains is larger than that of SARS-CoV, which denote the larger diversity exits in the SARS-CoV-2 virus. Conclusion These results show that the relative synonymous codon usage values in the coronavirus could be used for further research on their evolutionary phenomenon.
Li, Ai-Hua,Liu, Hong-Can,Xin, Yu-Hua,Kim, Song-Gun,Zhou, Yu-Guang International Union of Microbiological Societies 2014 International journal of systematic and evolutiona Vol.64 No.2
<P>A Gram-stain-positive, aerobic, non-spore-forming, short-rod-shaped bacterium, designated strain MP203<SUP>T</SUP>, was isolated from ice water of Midui Glacier in Tibet Autonomous Region, China. The strain was psychrotolerant, growing at 0–25 °C. 16S rRNA gene sequence analysis showed that strain MP203<SUP>T</SUP> was most similar to <I>Frigoribacterium faeni</I> NBRC 103066<SUP>T</SUP>, <I>Compostimonas suwonensis</I> KACC 13354<SUP>T</SUP>, <I>Frigoribacterium mesophilum</I> KCTC 19311<SUP>T</SUP>, <I>Marisediminicola antarctica</I> CCTCC AB 209077<SUP>T</SUP> and <I>Alpinimonas psychrophila</I> JCM 18951<SUP>T</SUP>, with similarities of 97.4, 97.2, 97.2, 97.1 and 97.1 %, respectively. The maximum-likelihood phylogenetic tree indicated that strain MP203<SUP>T</SUP> clustered with nine genera of the family <I>Microbacteriaceae</I>, namely <I>Frigoribacterium</I>, <I>Compostimonas</I>, <I>Marisediminicola</I>, <I>Alpinimonas</I>, <I>Frondihabitans</I>, <I>Clavibacter</I>, <I>Subtercola</I>, <I>Klugiella</I> and <I>Agreia</I><I>.</I> However, bootstrap analysis showed that there was no significance in the branching pattern of the linage comprising strain MP203<SUP>T</SUP> and any existing generic lineage of the family <I>Microbacteriaceae</I>. DNA–DNA hybridization results indicated levels of relatedness between strain MP203<SUP>T</SUP> and <I>Marisediminicola antarctica</I> CCTCC AB 209077<SUP>T</SUP>, <I>Frigoribacterium faeni</I> NBRC 103066<SUP>T</SUP>, <I>Frigoribacterium mesophilum</I> KCTC 19311<SUP>T</SUP>, <I>Compostimonas suwonensis</I> KACC 13354<SUP>T</SUP> and <I>Alpinimonas psychrophila</I> JCM 18951<SUP>T</SUP> were 25.8±7.3, 29.6±7.6, 19.7±6.7, 16.0±4.2 and 12.4±5.1 % (mean±<SMALL>sd</SMALL>), respectively. The G+C content of the genomic DNA was 64.1 mol%. Analysis of the cell-wall peptidoglycan revealed that the peptidoglycan structure of strain MP203<SUP>T</SUP> was B10 type with Gly[<SMALL>l</SMALL>-Hse]–<SMALL>d</SMALL>-Glu–<SMALL>d</SMALL>-DAB, containing 2, 4-diaminobutyric acid (DAB) as a diagnostic amino acid. The cell-wall sugars were rhamnose, ribose, mannose and glucose. The major fatty acids were anteiso-C<SUB>15 : 0</SUB>, iso-C<SUB>16 : 0</SUB> and anteiso A-C<SUB>15 : 1</SUB>. An unusual compound identified as anteiso-C<SUB>15 : 0</SUB>-DMA (1, 1-dimethoxy-anteiso-pentadecane) was also present in strain MP203<SUP>T</SUP>. The predominant menaquinone was MK-10. Diphosphatidylglycerol (DPG), phosphatidylglycerol (PG), one unknown glycolipid and four unknown lipids were detected in the polar lipid extracts. As strain MP203<SUP>T</SUP> was distinguishable from phylogenetically related genera in the family <I>Microbacteriaceae</I> in terms of its physiological and chemotaxonomic characteristics and phylogenetic position, it was considered to represent a novel species of a new genus. Thus, the name <I>Glaciihabitans tibetensis</I> gen. nov., sp. nov. is proposed. The type strain of <I>Glaciihabitans tibetensis</I> is MP203<SUP>T</SUP> ( = CGMCC 1.12484<SUP>T</SUP> = KCTC 29148<SUP>T</SUP>).</P>
Li, Yan,Yun, Kum-Hee,Lee, Hyeri,Goh, Sung-Ho,Suh, Yang-Gun,Choi, Yongdoo Elsevier 2019 Biomaterials Vol.197 No.-
<P><B>Abstract</B></P> <P>Radiotherapy (RT), along with surgery and chemotherapy, is a major modality of cancer therapy. Nevertheless, insufficient deposition of radiation energy in tumors and hypoxia-associated radioresistance remain the greatest challenges in RT. Here, we propose porous platinum nanoparticles as a new nanomedicine platform for solving these two problems at the same time using a single agent. Because of the combined advantages of a high-Z element and oxygen generation capability, porous platinum nanoparticles can significantly increase radiation-induced DNA damage, ROS stress, and cell cycle arrest by effectively depositing X-ray radiation energy within the cancer cells. Further, porous platinum nanoparticles increase tumor oxygenation by converting endogenic H<SUB>2</SUB>O<SUB>2</SUB> to O<SUB>2</SUB>, thus greatly enhancing RT with no apparent <I>in vivo</I> toxicity to animals. This study presents a new nanomedicine strategy based on the use of porous high-Z metal nanoparticles with oxygen generation function for the synergistic enhancement of RT in cancer treatment.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
A Generalized Finite Difference Method for Solving Fokker-Planck-Kolmogorov Equations
Zhao, Li,Yun, Gun Jin The Korean Society for Aeronautical and Space Scie 2017 International Journal of Aeronautical and Space Sc Vol.18 No.4
In this paper, a generalized discretization scheme is proposed that can derive general-order finite difference equations representing the joint probability density function of dynamic response of stochastic systems. The various order of finite difference equations are applied to solutions of the Fokker-Planck-Kolmogorov (FPK) equation. The finite difference equations derived by the proposed method can greatly increase accuracy even at the tail parts of the probability density function, giving accurate reliability estimations. Compared with exact solutions and finite element solutions, the generalized finite difference method showed increasing accuracy as the order increases. With the proposed method, it is allowed to use different orders and types (i.e. forward, central or backward) of discretization in the finite difference method to solve FPK and other partial differential equations in various engineering fields having requirements of accuracy or specific boundary conditions.
8 Antenna Polar Switching Up-Down Relay Networks
Jun Li,Moon Ho Lee,Yier Yan,Bu Shi Peng,Gun Joon Hwang 한국전자파학회JEES 2011 Journal of Electromagnetic Engineering and Science Vol.11 No.4
In this paper, we propose a reliable 8×8 up-down switching polar relay code based on 3GPP LTE standard, motivated by 3GPP LTE down link, which is 30 bps/Hz for 8×8 MIMO antennas, and by Arikan’s channel polarization for the frequency selective fading (FSF) channels with the generator matrix Q8. In this scheme, a polar encoder and OFDM modulator are implemented sequentially at both the source node and relay nodes, the time reversion and complex conjugation operations are separately implemented at each relay node, and the successive interference cancellation (SIC) decoder, together with the cyclic prefix (CP) removal, is performed at the destination node. Use of the scheme shows that decoding at the relay without any delay is not required, which results in a lower complexity. The numerical result shows that the system coded by polar codes has better performance than currently used designs.