Development of Key Technologies and Robotics for Intelligent Apple Harvesting

Jinxing Wang,Jingwei Sun,Yi Liu,Junsheng Liu,Guangze Zhao 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11

Evaluation of the effect of mechanical deformation on beam isocenter properties of the SC200 scanning beam delivery system

Wang, Ming,Zheng, Jinxing,Song, Yuntao,Li, Ming,Zeng, Xianhu Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.9

For proton pencil beam scanning (PBS) technology, the accuracy of the dose distribution in a patient is sensitive to the properties of the incident beam. However, mechanical deformation of the proton therapy facility may occur, and this could be an important factor affecting the proton dose distribution in patients. In this paper, we investigated the effect of deformation on an SC200 proton facility's beam isocenter properties. First, mechanical deformation of the PBS nozzle, L-shape plate, and gantry were simulated using a Finite Element code, ANSYS. Then, the impact of the mechanical deformation on the beam's isocenter properties was evaluated using empirical formulas. In addition, we considered the simplest case that could affect the properties of the incident beam (i.e. if only the bending magnet (BG3) has an error in its mounting alignment), and the effect of the beam optics offset on the isocenter characteristics was evaluated. The results showed that the deformation of the beam position in the X and Y direction was less than 0.27 mm, which meets the structural design requirements. Compared to the mechanical deformation of the L-shape plate, the deformation of the gantry had more influence on the beam's isocenter properties. When the error in the mounting alignment of the BG3 is equal to or more than 0.3 mm, the beam deformation at the isocenter exceeds the maximum accepted deformation limits. Generally speaking, for the current design of the SC200 scanning beam delivery system, the effects of mechanical deformation meet the maximum accepted beam deformation limits. In order to further study the effect of the incident beam optics on the isocenter properties, a fine-scale Monte Carlo model including factors relating to the PBS nozzle and the BG3 should be developed in future research.

Multibody dynamics analysis of a silent chain drive timing system

Jinxing Yang,Zengming Feng,Huanhuan Gao,Tianrui Wang,Kai Xu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.4

Multibody dynamics analysis of a silent chain drive timing system can quickly detect system defects in the product design stage and shorten the development cycle. At present, most of the research on chain drives focuses on roller chains. A 3D silent chain drive timing system model considering the fluctuation of crankshaft sprocket speed and camshaft sprocket torque was established in this paper based on recursive algorithm and Hertz contact theory. The accuracy of the model was verified by comparing the experimental and simulation results of the chain tension. The simulation results show that the chain tension fluctuation with time is obviously affected by the camshaft torque fluctuation, and the maximum chain tension ranges from 233 N to 1202 N, which is less than the safe rotation fatigue limit 1600 N. When the crankshaft sprocket speed is 6000 r/min, the maximum contact force between the chain and crankshaft sprocket and slack guide is 751 N and 588 N, respectively. The maximum chain fluctuation caused by meshing impact between chain and sprocket and polygon effect is 0.52 mm and 0.48 mm, respectively. The system transmission error ranges from 0.14° to 0.38°, which is less than 1° of the maximum allowable transmission error.

Investigating the effects of a range shifter on skin dose in proton therapy

Wang Ming,Zhang Lei,Zheng Jinxing,Li Guodong,Dai Wei,Dong Lang 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.1

Proton treatment may deliver a larger dose to a patient’s skin than traditional photon therapy, especially when a range shifter (RS) is inserted in the beam path. This study investigated the effects of an RS on skin dose while considering RS with different thicknesses, airgaps and materials. First, the physical model of the scanning nozzle with RS was established in the TOol for PArticle Simulation (TOPAS) code, and the effects of the RS on the skin dose were studied. Second, the variations in the skin dose and isocenter beam size were examined by reducing the air gap. Finally, the effects of different RS materials, such as polymethylmethacrylate (PMMA), Lexan, polyethylene and polystyrene, on the skin dose were analysed. The results demonstrated that the current RS design had a negligible effect on the skin dose, whereas the RS significantly impacted the isocenter beam size. The skin dose was increased considerably when the RS was placed close to the phantom. Moreover, the magnitude of the increase was related to the thickness of the inserted RS. Meanwhile, the results also revealed that the secondary proton primarily contributed to the increased skin dose.

On elastic and plastic length scales in strain gradient plasticity

Jinxing Liu,Wen Wang,Ziyu Zhao,Ai Kah Soh 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.61 No.2

The Fleck-Hutchinson theory on strain gradient plasticity (SGP), proposed in Adv. Appl Mech 33 (1997) 295, has recently been reformulated by adopting the strategy of decomposing the second order strain presented by Lam et al. in J Mech Pays Solids 51 (2003) 1477. The newly built SGP satisfies the non negativity of plastic dissipation, which is still an outstanding issue in other SGP theories. Furthermore, it explicitly shows how elastic strain gradients and corresponding elastic characteristic length scales come into play in general elastic-plastic loading histories. In this study, the relation between elastic length scales and plastic length scales is investigated by taking wire torsion as an example. It is concluded that the size effects arising when two sets of length scales are of the same order are essentially elastic instead of plastic.

Throughput and Delay of Single-Hop and Two-Hop Aeronautical Communication Networks

Yufeng Wang,Mustafa Cenk Ertürk,Jinxing Liu,나인호,산카,Salvatore Morgera 한국통신학회 2015 Journal of communications and networks Vol.17 No.1

Aeronautical communication networks (ACN) is an emerging concept in which aeronautical stations (AS) are considered as a part of multi-tier network for the future wireless communication system. An AS could be a commercial plane, helicopter, or any other low orbit station, i.e., Unmanned air vehicle, high altitude platform. The goal of ACN is to provide high throughput and cost effective communication network for aeronautical applications (i.e., Air traffic control (ATC), air traffic management (ATM) communications, and commercial in-flight Internet activities), and terrestrial networks by using aeronautical platforms as a backbone. In this paper, we investigate the issues about connectivity, throughput, and delay in ACN. First, topology of ACN is presented as a simple mobile ad hoc network and connectivity analysis is provided. Then, by using information obtained fromconnectivity analysis, we investigate two communication models, i.e., single-hop and two-hop, in which each source AS is communicating with its destination AS with or without the help of intermediate relay AS, respectively. In our throughput analysis, we use the method of finding the maximum number of concurrent successful transmissions to derive ACN throughput upper bounds for the two communication models. We conclude that the two-hop model achieves greater throughput scaling than the single-hop model for ACN and multihop models cannot achieve better throughput scaling than two-hop model. Furthermore, since delay issue is more salient in two-hop communication, we characterize the delay performance and derive the closed-form average end-to-end delay for the two-hop model. Finally, computer simulations are performed and it is shown that ACN is robust in terms of throughput and delay performances.

Preparation, characterization, and properties of novel meglumine-based polysiloxane surfactants

Yanyun Bai,Jinxing Li,Xiumei Tai,Guoyong Wang 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.84 No.-

A series of meglumine-based polysiloxane surfactants, (PSim-n) with different numbers of megluminebranches were prepared. The formed surfactants were characterized by FT-IR and NMR techniques. Physiochemical properties, such as surface activity, aggregation behavior, and wettability, were closelyexamined and used to differentiate the various samples. Thefindings demonstrate that PSim-n surfactantspossess high surface activity and can wet-out a parafilm surface at all but extremely low concentrations. Furthermore, PSi6-4, the surfactant with the highest meglumine concentration, can form larger complexaggregates in aqueous solutions.

Diversity of Mitochondrial DNA cytochrome b Gene in Two Subspecies of Striped Field Mouse,Apodemus agrarius coreae Thomas and A. agrarius manchuricus Thomas (Mammalia, Rodentia) from Korea and Northeast China

Hung Sun Koh(고흥선),Jinxing Wang(왕금성),Bae Kun Lee(이배근),Seon Wook Heo(허선욱) 한국동물분류학회 2001 Animal Systematics, Evolution and Diversity Vol.17 No.1

Identification of a nuclear-recessive gene locus for male sterility on A2 chromosome using the Brassica 60 K SNP array in nonheading Chinese cabbage

Guolin Zhou,Xia Li,Aihua Wang,Feng Zu,Zhenhua Hu,Jiazao Lin,Jinxing Tu 한국유전학회 2016 Genes & Genomics Vol.38 No.12

WS24-3 is a newly bred recessive genic male sterility line of the non-heading Chinese cabbage (Brassica rapa ssp. chinensis). Here, an F2 population was produced from the cross between WS24-3 and a male-fertile breeding line (WS135). The Illumina Brassica 60 K single nucleotide polymorphism (SNP) array was used for SNPs detecting between sterile and fertile bulks from the F2 population, and 62 SNPs were identified. BLAST analysis of the 62 SNPs revealed that the A2 chromosome of Brassica rapa genome contained 22 SNPs, whereas the other chromosomes did not contain more than 6 SNPs each. These data indicated that the potential target gene locus, named Bra2Ms, might be located on A2. Based on 10 of the 22 SNPs, allele-specific-polymerase chain reaction (AS-PCR) primers and single sequence repeat (SSR) primers were designed, 5 AS-PCR primers and 9 SSR primers showed difference between the bulks in electrophoretic determination. Analysis of these markers in F2 population revealed that Bra2Ms was genetically delimited to a region of 1.2 cM. We also detected two co-segregated markers SSRa2-951 and SSRa2-960 in this region. The markers identified in our study might facilitate the transfer of recessive genic male sterility alleles to other favorable genetic backgrounds. Furthermore, these markers will support a map-based clone of Bra2Ms.

Comparative transcript profiling and cytological observation of the newly bred recessive genic male sterility non‑heading Chinese cabbage (Brassica rapa ssp. chinensis) line WS24‑3A

Liping Song,Xia Li,Feng Zu,Changbin Gao,Bincai Wang,Chufa Lin,Jinxing Tu,Aihua Wang,Guolin Zhou 한국유전학회 2019 Genes & Genomics Vol.41 No.12

Background WS24-3A is a newly bred non-heading Chinese cabbage genic male-sterile line, in which sterility is controlled by a recessive gene, designated as Bra2ms. WS24-3A has been used for hybrid breeding. Objective To reveal the underlying molecular mechanisms responsible for the sterility of WS24-3A. Methods Cytological observation of the process of sterile/fertile anther development was performed to determine the tissue and stage in which sterility occurs. Phenotyping and transcriptomic analyses were performed to identify differentially expressed genes (DEGs) between sterile and fertile flower buds at different stages. Results Cytological analysis revealed no tetrads at stage 7 or at later stages of anther development, and the degradation of callose was delayed. Abnormal meiocytes were surrounded by sustaining callose that degenerated gradually in WS24-3A. Comparative transcript profiling identified 3282 DEGs during three anther developmental stages, namely, pre-meiotic anther, meiotic anther, and anthers with single-celled pollen stage. The difference in DEG percentage between up-regulated and down-regulated at meiotic anther stage was obviously larger than at the other two stages; further, most DEGs are important for male meiosis, callose synthesis and dissolution, and tapetum development. Ten DEGs were found to be involved in anther and pollen development, which were analyzed by quantitative PCR. Conclusion Bra2ms affected gene expression in meiocytes and associated with callose synthesis, degradation and tapetum development. Our results provide clues to elucidate the molecular mechanism of genic male sterility in non-heading Chinese cabbage.