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- 저자 : Wenfeng Guo (검색결과 5 건)
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Wenfeng Xiang,Dong Li,Minghao Hu,Wenzheng Yue,Haizhong Guo 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.75 No.5
Single-layer MoS$_2$ films were deposited on sapphire substrates by using pulsed laser deposition. The substrate temperature dependence of the structural, optical and photoluminescence properties of single-layer MoS$_2$ films was investigated. An increased substrate temperature improved the surface morphology and the crystal quality of the MoS$_2$ films. Moreover, the absorption and the photoluminescence properties of the MoS$_2$ films were enhanced. In addition, the mechanism underlying the effect of substrate temperature on the properties of single-layer MoS$_2$ films is discussed.
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Transmission of symbiotic fungus with a nonsocial leaf-rolling weevil
Xiaoqiong Li,Wenfeng Guo,Yuanguang Wen,Manoj Kumar Solanki,Jianqing Ding 한국응용곤충학회 2016 Journal of Asia-Pacific Entomology Vol.19 No.3
Transmission modes of symbionts with fungus-growing insects are closely related to the stability of symbioses. As compare to social fungus-farming insects, transmission modes of nonsocial fungus-farming insects need to be further investigated. Euops chinensis, a nonsocial leaf-rolling weevil, harbors a symbiotic fungus Penicillium herquei in the specialized mycangium. Previous works have indicated that P. herquei is cultivated to host plants by females during oviposition process, however, it is still unclear when (before or after oviposition) and how P. herquei is transmitted. In this study, we observed fungal cultivating behaviors and adult bodies by scanning electron microscopy (SEM), and compared isolation rates of P. herquei on ovary eggs, newly oviposited eggs, cradle leaves (leaf pieces cut before rolling cradles), cradles, and female mycangia. Fungal isolateswere identified by internal transcribed spacers (ITS) and cytochrome oxidase I (COI) genes.Wefound the female's serrated tarsi and comb-like setae on the abdomen were specialized structures for fungal transmission. Newly oviposited eggs showed 81.11% frequency of fungal symbionts, but ovary eggs did not showany growth of fungal symbionts. Isolation rates of P. herquei on cradle leaves, mycangia and cradles were 76.67%, 77.71% and 87.72%, respectively. Analyses of ITS and COI genes showed that isolated fungal strains belong to the same species. We concluded that P. herquei was transmitted before oviposition, and the female's tarsi are newly found specialized structures for fungal transmission. This study elucidates the cultivar transmission modewith fungus-farming attelabidweevils, and might be useful to study of other fungiculture mutualisms.
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Refinement of Kinect Sensor’s Depth Maps Based on GMM and CS Theory
Qian Zhang,ShaoMin Li,Wenfeng Guo,Pei Wang,Jifeng Huang 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.5
As the Microsoft’s Kinect sensor can generate a real-time dense depth map with relatively commercial available, it is widely used in depth map capturing. However, there are some artifacts like holes, instability of the raw input data, which seriously affect the application. To solve this problem, in this paper, we propose a novel depth map refinement method based on by GMM and CS theory which enable the kinect sensor generate a dense depth map, the background large holes are filled without blurring, and the edges of the objects are sharpened, median filter is used to remove noise. Experiments on captured indoor data demonstrate the effectiveness of the method especially in the edge area and occlusion area that our method can obtain better results.
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Shaohua Chen,Xuan Liu,Shengyang Dai,Wenfeng Xiang,Haizhong Guo,Junjian Li 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.2
CuxO (Cupric Oxide) nanotubes (NTs) were synthesized by using thermal oxidation of Cu nanowires (NWs) for 2 and 4 hours, respectively, and the effect of the components on their photoelectrical properties due to the infrared (IR) light with a wavelength of 1064 nm were investigated. In the 2-h CuxO NTs, the main component was Cu2O; however, the 4-h CuxO NTs were composed of a mixture of CuO and Cu2O. The photoelectric properties showed that the voltage difference and the sensitivity of 4-h CuxO NTs were more than 3 times those of the 2-h CuxO NTs, and its linear range was only about one-third that of the 2-h CuxO NTs. The above results were caused by the 4-h CuxO NTs containing a higher content of CuO, which had a suitable bandgap of 1.2 eV for light with a wavelength of 1064 nm. In addition, the response and the recovery times for the 4-h NTs were on the same order as those of the 2-h NTs. The conclusions from this article indicated that 4-h and 2-h NTs were very promising for the design of IR photodetector device with higher sensitivity and a larger detection range respectively.
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A missense variant in NCF1 is associated with susceptibility to multiple autoimmune diseases
Zhao, Jian,Ma, Jianyang,Deng, Yun,Kelly, Jennifer A,Kim, Kwangwoo,Bang, So-Young,Lee, Hye-Soon,Li, Quan-Zhen,Wakeland, Edward K,Qiu, Rong,Liu, Mengru,Guo, Jianping,Li, Zhanguo,Tan, Wenfeng,Rasmussen, Nature Pub. Co 2017 Nature genetics Vol.49 No.3
<P>Systemic lupus erythematosus (SLE) is a heterogeneous autoimmune disease with a strong genetic component characterized by autoantibody production and a type 1 interferon signatures. Here we report a missense variant (g.74779296G>A; p.Arg90His) in NCF1, encoding the p47phox subunit of the phagocyte NADPH oxidase (NOX2), as the putative underlying causal variant that drives a strong SLE-associated signal detected by the lmmunochip in the GTF2IRD1-GTF2I region at 7q11.23 with a complex genomic structure. We show that the p.Arg90His substitution, which is reported to cause reduced reactive oxygen species (ROS) production(2), predisposes to SLE (odds ratio (OR) = 3.47 in Asians (P-meta = 3.1 x 10(-104)), OR = 2.61 in European Americans, OR = 2.02 in African Americans) and other autoimmune diseases, including primary Sjogren's syndrome (OR = 2.45 in Chinese, OR = 2.35 in European Americans) and rheumatoid arthritis (OR = 1.65 in Koreans). Additionally, decreased and increased copy numbers of NCF1 predispose to and protect against SLE, respectively. Our data highlight the pathogenic role of reduced NOX2-derived ROS levels in autoimmune diseases.</P>
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