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Yi Cheng,Young-Il Cho,Jong-Wook Chung,Kyung-Ho Ma,Yong-Jin Park 韓國作物學會 2009 Korean journal of crop science Vol.54 No.4
In this study, 29 simple sequence repeat (SSR) markers were used to analyze the genetic diversity and population structure of 125 rice accessions from 40 different origins in Africa, Asia, Europe, South America, and Oceania. A total of 333 alleles were detected, with an average of 11.5 per locus. The mean values of major allele frequency, expected heterozygosity, and polymorphism information content (PIC) for each SSR locus were 0.39, 0.73, and 0.70, respectively. The highest mean PIC was 0.71 for Asia, followed by 0.66 for Africa, 0.59 for South America, 0.53 for Europe, and 0.47 for Oceania. Model-based structure analysis revealed the presence of five subpopulations, which was basically consistent with clustering based on genetic distance. Some accessions were clearly assigned to a single population in which >70% of their inferred ancestry was derived from one of the model-based populations. In addition, 12 accessions (9.6%) were categorized as having admixed ancestry. The results could be used to understanding the genetic structure of rice cultivars from these regions and to support effective breeding programs to broaden the genetic basis of rice varieties.
Sliding Friction and Wear Behavior of C/C Composites Against 40 Cr Steel
Yicheng Ge,Maozhong Yi,Huijuan Xu,Ke Peng,Lin Yang 한국탄소학회 2009 Carbon Letters Vol.10 No.2
In this work, effects of carbon matrix on sliding friction and wear behavior of four kinds of C/C have been investigated against 40 Cr steel ring mate. Composite A with rough lamination carbon matrix (RL) shows the highest volume loss and coefficient of friction, while composite D with smooth lamination/resin carbon matrix (SL/RC) shows the lowest volume loss. The worn surface of composite A appears smooth, whereas that of composite C with smooth lamination carbon (SL) appears rough. The worn surface of composite D appears smooth under low load but rough under high load. Atomic force microscope images show that the size of wear particles on the worn surface is also dependent on the carbon matrix.
Release Profile and Antimicrobial Activity of Nisin Control-released from Agar Gel Foods
( Yicheng Zong ),( Jung Hoon Han ),( Yeong Ji Oh ),( Sea C. Min ) 한국산업식품공학회 2017 산업 식품공학 Vol.21 No.1
The release profiles of nisin from nisin-incorporating gel foods and the antimicrobial activities of the gels on the growth of Brochothrix thermosphacta in an aqueous system containing the gels have been investigated. A linear regression model was applied to determine the diffusion coefficient (D) for the diffusion of nisin in the gel. The antimicrobial activities of nisin released from 1, 2 and 3% (w/v) agar gels on the growth of B. thermosphacta in a broth medium with and without nisin were investigated. The D decreased from 1.2×10<sup>-2</sup> to 8.2×10<sup>-3</sup> and 6.4×10<sup>-3</sup> cm<sup>2</sup>/s as the agar concentration in the gel increased from 1 to 2 and 3% (w/v), demonstrating the diffusion rate in the gels can be controlled by the agar concentration in gel. The agar gel incorporating nisin inhibited the B. thermosphacta growth in the broth medium by prolonging the lag phase. The growth inhibition was enhanced by the addition of nisin in the medium. The results of this study exhibited that the gel food is a feasible nisin delivery system with a controlled release achieved by the adjustment of agar concentration in the system, demonstrating the potential of nisin-incorporating gel for preserving particulate-containing drinks.
Self-collision Avoidance Trajectory Planning and Robust Control of a Dual-arm Space Robot
Yicheng Liu,Chunxiao Yu,Jingyuan Sheng,Tao Zhang 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.6
This paper addresses robust trajectory tracking for a dual-arm 6-DOF (degree of freedom) space robot with self-collision avoidance. A trajectory planning method for self-collision avoidance is presented with the information of danger field between the manipulators. On this basis, the kinematics and dynamics models of the whole system are considered together to realize the tracking of the end effectors. Thus a robust decentralized control strategy is proposed based on signal compensation and back-stepping. In contrast to the existing researches, the proposed scheme ensures that the space robotic system can automatically avoid self-collision and displays good robust performance. The simulation results verify the effectiveness of the proposed approach.
Yicheng Zhou,Peng Shan 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.5
A component-level characteristic simulation method for single-stage turbocharging reciprocating engine propeller propulsion system (STS) was studied. A regulating method of STS was stated, the joint-working equations of STS were placed, and the altitude-velocity characteristics of STS were simulated. The flying characteristics of each component and the overall performance were compared between a STS and a dual-stage turbocharging reciprocating engine propeller propulsion system (DTS). The research revealed that the regulating method of STS can meet the design objectives, the full power holding altitude of STS can achieve 5.5km, while that of the DTS is 12.5 km. When selecting the same propeller and engine, the characteristics of each component between STS and DTS are similar, and the variation ranges with the altitude and velocity of the propulsion efficiency, specific fuel consumption, and total efficiency of STS are narrower than that of DTS.
Yicheng Yang,Jin Tong,Hongyin Ruan,Meihua Yang,Chunli Sang,Gang Liu,Wurelihazi Hazihan,Bin Xu,Sandor Hornok,Kadyken Rizabek,Kulmanova Gulzhan,Zhiqiang Liu,Yuanzhi Wang 대한기생충학열대의학회 2021 The Korean Journal of Parasitology Vol.59 No.1
To date, there is no report on the genetic diversity of ticks in these regions. A total of 370 representative ticks from the south and east regions of Kazakhstan (SERK) and Xinjiang Uygur Autonomous Region (XUAR) were selected for molecular comparison. A fragment of the mitochondrial cytochrome c oxidase subunit I (cox1) gene, ranging from 631 bp to 889 bp, was used to analyze genetic diversity among these ticks. Phylogenetic analyses indicated 7 tick species including Hyalomma asiaticum, Hyalomma detritum, Hyalomma anatolicum, Dermacentor marginatus, Rhipicephalus sanguineus, Rhipicephalus turanicus and Haemaphysalis erinacei from the SERK clustered together with conspecific ticks from the XUAR. The network diagram of haplotypes showed that i) Hy. asiaticum from Almaty and Kyzylorda Oblasts together with that from Yuli County of XUAR constituted haplogroup H-2, and the lineage from Chimkent City of South Kazakhstan was newly evolved; and ii) the R. turanicus ticks sampled in Israel, Almaty, South Kazakhstan, Usu City, Ulugqat and Baicheng Counties of XUAR were derivated from an old lineage in Alataw City of XUAR. These findings indicate that: i) Hy. asiaticum, R. turanicus and Ha. erinacei shared genetic similarities between the SERK and XUAR; and ii) Hy. marginatum and D. reticulatus show differences in their evolution.
Kruskal-Wallis one-way analysis of variance based on linear placements
Yicheng Hong,이승철 대한수학회 2014 대한수학회보 Vol.51 No.3
The limiting distribution for the linear placement statistics under the null hypotheses has been provided by Orban and Wolfe [9] and Kim [5] when one of the sample sizes goes to infinity, and by Kim, Lee and Wang [6] when the sample sizes of each group go to infinity simultaneously. In this paper we establish the generalized Kruskal-Wallis one-way analysis of variance for the linear placement statistics.
KRUSKAL-WALLIS ONE-WAY ANALYSIS OF VARIANCE BASED ON LINEAR PLACEMENTS
Hong, Yicheng,Lee, Sungchul Korean Mathematical Society 2014 대한수학회보 Vol.51 No.3
The limiting distribution for the linear placement statistics under the null hypotheses has been provided by Orban and Wolfe [9] and Kim [5] when one of the sample sizes goes to infinity, and by Kim, Lee and Wang [6] when the sample sizes of each group go to infinity simultaneously. In this paper we establish the generalized Kruskal-Wallis one-way analysis of variance for the linear placement statistics.