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RISS 인기검색어
- 검색키워드
- 저자 : Yunyun Xu (검색결과 6 건)
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Growth of Single-Walled Carbon Nanotubes from Well-Defined POSS Nanoclusters Structure
Yunyun Liu,Yali Hu,Qiran Cai,Xiangju Xu,Yin Chen,SHAOMING HUANG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.1
High-quality single-walled carbon nanotubes (SWNTs) with narrow diameter distribution can be generated from well-defined Si8O12 nanoclusters structure which form from thermal decomposition of chemically modi¯ed polyhedral oligomeric silsesquioxane (POSS). The nanosized SixOy particles were proved to be responsible for the SWNT growth and believed to be the reason for the narrow diameter distribution of the as-grown SWNTs. This could be extended to other POSS. The SWNTs grown from the nanosized SixOy particles were found to be semiconducting enriched SWNTs (s-SWNTs). A facile patterning technology, direct photolithography, was developed for generating SWNT pattern, which is compatible to industrial-level fabrication of SWNTs pattern for device applications. The metal-free growth together with preferential growth of s-SWNTs and patterning in large scale from the structure-defined silicon oxide nanoclusters not only represent a big step toward the control growth of SWNTs and fabrication of devices for applications particularly in nanoelectronics and biomedicine but also provide a system for further studying and understanding the growth mechanism of SWNTs from nanosized materials and the relationship between the structure of SWNT and nonmetal catalysts.
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Data density-based RGB color component feature extraction and area measurement method for silkworm
Luo Yunyun,Wen Chunming,Wen Jie,Xu Qing,Liang Xiang,Yang Jie,Lan Zimian 한국응용곤충학회 2023 Journal of Asia-Pacific Entomology Vol.26 No.4
Accurate measurement of silkworm area is an essential part of efficient automated farming. The manual mea surement of silkworm area in large silkworm mounts has problems such as low accuracy and low efficiency. To address the problem that it is difficult to measure the area of silkworms in the silkworm holders accurately, this paper proposed a method to remove the background of color images based on RGB color components. In this method, the color component features of the silkworm rearing bed image were extracted. The K-means method was improved by the offset of component data peak density and the recalculation of the clustering center. Then, using the new clustering center to calculate the segmentation threshold point. After removing the background area, estimated the proportion of silkworm area in the silkworm rearing bed. In this paper, the area measurement experiments were carried out in different luminance environments for sparse and dense silkworm rearing bed images. After processing, the results of the proposed method were compared and analyzed with those of other segmentation methods. The results showed that the proposed intelligent segmentation threshold judgment method based on the RGB components difference feature has the lowest error rate, and the average accuracy of measurement is 87.29%. The method in this paper could effectively reduce the interference of ambient light on silkworm and mulberry leaves segmentation recognition, which might help improve the accuracy of measuring silkworm area.
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A Feasibility Research on the Mechanism of Cold Chain Business in Deppon Logistics
Yanni Li,Yunyun Xu,Baichao Gong,Haopeng Sun,Fuguang Zhao 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.3
Cold chain distribution is always well-known as the “Mount Everest” in international logistics industry, while the rapid development in recent years of domestic meat, frozen food, cold drinks industry and dairy industry brought a leapfrog growth of cold chain logistics, which respectively stimulated the need for logistics outsourcing service from Third Party Logistics. Those companies demanding for exploiting cold chain business on one hand requires a complete set of refrigerated logistics chains, on the other hand also requires enterprises to establish a good and professional transport system with refrigerated operation equipment, which are precisely the weakness of manufacturing enterprises. Thus, outsourcing of cold chain logistics to a third party is the best choice for companies to focus on its core business. By analyzing the bulletins of International Cold Chain Logistics Summits, this paper shows the problems of cold chain industry in China and points out the potentials for its future development. It further analyzes the feasibility of launching cold chain business of Deppon Logistics. The purpose is to offer some suggestions to work out the barriers and set up a modern operation system under the big data age in Deppon.
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Genome-wide analysis and environmental response profiling of SOT family genes in rice (Oryza sativa)
Rongjun Chen,Yunyun Jiang,Jiali Dong,Xin Zhang,Hongbo Xiao,Zhengjun Xu,Xiaoling Gao 한국유전학회 2012 Genes & Genomics Vol.34 No.5
Sulphotransferase (SOT) catalyses the transfer of a sulphonate group from 3'-phosphoadenosine 5'-phosphosulphate (PAPS)to an appropriate hydroxyl group of various substrates with the parallel formation of 3'-phosphoadenosine 5'-phosphate (PAP). Although several SOTs have been identified and characterized in mammalian, their role in plant is still unclear. In this study, we report genome-wide comprehensive expression analysis of 35 putative SOT genes in rice. The 35 OsSOTs were tandemly arranged into six clusters. The phylogenetic analysis showed that there were 7 subfamilies of OsSOTs and 11 putatively conserved motifs. Six OsSOTs might be pseudogenes,25 have the two motifs which were involved in PAPS binding regions I and IV. Microarray data indicated that all the OsSOTs were expressed almost at the same level but with different patterns: most OsSOTs were expressed exclusively in stigma and ovary and induced by IAA and BAP, several genes were induced by tZ and DMSO and 11 OsSOTs were response to abiotic stress. Further analysis showed that these 11 genes contained cis-regulatory elements responding to abiotic stresses.
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Rongjun Chen,Yongrong Liao,Shengbin Liu,Yunyun Jiang,Changqiong Hu,Xuewei Zhang,Xufeng Cao,Zhengjun Xu,Xiaoling Gao,Lihua Li,Jianqing Zhu 한국유전학회 2017 Genes & Genomics Vol.39 No.1
Dirigent (DIR) and DIR-like family genes were involved in lignification or in the response to pathogen infection and abiotic stress in plants. Little is known to us about how rice DIR genes respond to adverse conditions. In this study, we reported genome-wide analysis of 49 DIR or DIR-likes genes in rice. The 49 OsDIRs or OsDIR-likes were tandem arranged into ten clusters. The phylogenetic analysis indicated that the 49 rice DIR and DIR-like genes cluster into five distinct subfamilies, DIR-a and four DIRlike subfamilies (DIR-b/d, and DIR-g, DIR-c, DIR-e). Meta-analysis of microarray gene expression datas indicated that all the OsDIRs or OsDIR-likes were expressed almost at the same level but with different patterns: most OsDIRs or OsDIR-likes were expressed exclusively in stigma and ovary and were induced by IAA and BAP; several genes were induced by trans-zeatin (tZ) and DMSO; 23 OsDIRs or OsDIR-likes were responded to abiotic stress. Our analysis also showed that most of these genes could respond to abiotic stresses, which contained cis-regulatory elements. The present study will provide a useful reference for further functional analysis of the DIR genes in rice.
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