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- 저자 : Yang Xiaoxiao (검색결과 13 건)
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Xiaoxiao Li,Kailian Zhang,Man Zhou,Kai Yang,Shi Yang,Xiaoshuai Ma,Changlin Yu,Yu Xie,Weiya Huang,Qizhe Fan 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2020 NANO Vol.15 No.02
Graphitic carbon nitride with nitrogen vacancies was successfully synthesized by the three-step method for the calcination of melamine, following urea-assisted hydrothermal and jacjoin calcination approach. The structural, surface, optical and electric properties were characterized by XRD, FT-IR, SEM, TEM, UV–Vis DRS, PL, N2 physical adsorption/desorption and electrochemical methods, which proved that this strategy of modifying g-C3N4 by nitrogen vacancies not only increased the specific surface area, exposed more active sites, but also inhibited the recombination of photogenerated carriers on the surface of photocatalysts, resulting in the enhancement of photocatalytic and electrocatalytic performances. The photocatalytic activities were measured under visible light irradiation ( λ > 420 nm), and their degradation efficiencies could be achieved for 99.8%, 55%, 100% and 99.7% corresponding to that of rhodamine B, acid orange II, methyl orange and methylene blue, respectively. The trapping experiments demonstrated that ·O2- played an important role in the degradation process. In addition, being an active electrocatalyst, nitrogen-deficient g-C3N4 showed a lower Tafel slope, smaller overpotential and the more effective electrochemical surface area compared with that of bare g-C3N4 in neutral media. This work underlines the importance of defect engineering to promote catalytic performance, which can provide a simple and efficient way for modifying g-C3N4 and other N-based catalysts.
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Meta-analysis of the effect of melatonin application on abiotic stress tolerance in plants
Yang Xiaoxiao,Ren Jianhong,Li Juanjuan,Lin Xinyue,Xia Xiangyu,Yan Wenjie,Zhang Yuxin,Deng Xiping,Ke Qingbo 한국식물생명공학회 2023 Plant biotechnology reports Vol.17 No.1
Melatonin is a hormone-like substance that promotes plant growth and development and alleviates stress levels. Although the physiological roles of melatonin and the underlying mechanisms have been qualitatively reviewed in plants, we do not fully understand when and how to apply melatonin to maximize its benefits. Here, we performed a meta-analysis to quantitatively evaluate the effect of melatonin on abiotic stress tolerance in plants and to determine the number of parameters modulated by melatonin. Melatonin significantly alleviated the growth inhibition induced by drought stress compared with other abiotic stresses, including salt, cold, heat, nitrogen deficit, and heavy metal toxicity, mainly owing to higher photosynthesis efficiency and antioxidant enzyme activity. Furthermore, melatonin modulated plant growth in a concentration-dependent manner and was more effective when applied to plants under moderate drought stress at an early stage via root irrigation. In addition, the impact of melatonin was greater in monocots than in dicots. Moreover, endogenous melatonin levels could be significantly increased via transgenic strategies. Among melatonin biosynthesis-related gene members, ASMT has tended to have the most influence on melatonin content in plants. In light of the rapidly developing genome editing technology, quantitatively increasing endogenous melatonin level in plant would be quite useful for moderating climatic conditions and combating desertification. Taken together, our results provide guidelines for melatonin application in crops plants for improving productivity under ongoing climate change.
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Wenjing Yang,Jianwei Xia,Xiaoxiao Guo,Miao Yu,Na Zhang 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.5
In this paper, an adaptive decentralized event-triggered global performance control of a class of largescale strongly interconnected nonlinear systems with external disturbances is investigated. Firstly, the original performance constrained large-scale nonlinear system is transformed into an equivalent unconstrained nonlinear largescale system by barrier function transformation. Secondly, the additional assumptions of interconnect terms such as upper bound function and matching conditions are eliminated by using the inherent properties of Gaussian function. In addition, an event-triggered mechanism is designed to reduce unnecessary transfers between the controller and the actuator for better resource efficiency. It is shown that the proposed control schemes guarantee that all signals of the closed-loop system are bounded, and the output tracking error is always kept within the given boundary. Finally, a numerical system and a mass-spring damping system are taken as examples to verify the effectiveness of the proposed control method.
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Analysis of Security Policy in Practical Internet Coordinates
Xiaohan Zhao,Xiaoxiao Song,Xiao Wang,Yang Chen,Beixing Deng,Xing Li 보안공학연구지원센터 2009 International Journal of Security and Its Applicat Vol.3 No.1
Network Coordinate (NC) System is an effective mechanism to predict network delay with limited measure overhead. As one of the representative NC systems, Practical Internet Coordinates (PIC) has proposed a security policy based on triangle inequality to defend malicious nodes in the system. However, there is a natural phenomena that nodes may violate triangle inequality in Internet. Thus, the performance of PIC security policy is worthy to be well researched under different attacks. In this paper, we analyze the security policy in PIC in three real network delay data sets and compare PIC with security to without security under four typical attacks. The experimental results in this paper demonstrate that PIC is vulnerable to attacks while more TIVs will cause higher relative error of PIC. Moreover, under attacks by more than 40% malicious nodes, the performance of PIC with security policy could barely be better than PIC without security. Even Colluding Isolate attack will result in worse performance in PIC having security policy.
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Ren Jianhong,Yang Xiaoxiao,Ma Chunying,Wang Yuling,Zhao Juan,Kang Le 한국식물생명공학회 2021 Plant biotechnology reports Vol.15 No.2
Aquaporin (AQP) plays an essential role in water uptake and transport in plants, especially in the response to drought stress, which suggests the use of AQP expression to regulate plant water-use efciency. The overexpression of various AQP genes in a variety of plants has been reported, but inconsistencies in the experimental variables (such as stress type, gene donor, and recipient genus) and physiological parameters used to evaluate transgenic plants have made it difcult to elucidate the complex mechanisms by which AQPs afect drought tolerance. In this study, we performed a meta-analysis to categorize the responses of physiological parameters involved in drought tolerance in AQP-overexpressing plants and to evaluate the experimental variables that afect transgenic plant performance. The results of various studies indicated that two primary physiological processes (osmotic adjustment and alleviation of oxidative damage) were signifcantly afected by AQP overexpression. Among the examined experimental variables, treatment media (soil), stress type (no watering), stress duration (long-term), recipient genus (Nicotiana), donor species (Musaceae), and gene family (PIP2) had positive impacts on drought tolerance in transgenic plants. These fndings may help to guide future studies investigating the function of AQPs in the response of plants to water defcit stress.
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Jianhong Wang,Xiaoxiao Wang,Juntao Li,Yiqiang Chen,Wenjun Yang,Liying Zhang 아세아·태평양축산학회 2015 Animal Bioscience Vol.28 No.2
This study was conducted to investigate the effects of dietary coconut oil as a medium-chain fatty acid (MCFA) source on performance, carcass composition and serum lipids in male broilers. A total of 540, one-day-old, male Arbor Acres broilers were randomly allotted to 1 of 5 treatments with each treatment being applied to 6 replicates of 18 chicks. The basal diet (i.e., R0) was based on corn and soybean meal and was supplemented with 1.5% soybean oil during the starter phase (d 0 to 21) and 3.0% soybean oil during the grower phase (d 22 to 42). Four experimental diets were formulated by replacing 25%, 50%, 75%, or 100% of the soybean oil with coconut oil (i.e., R25, R50, R75, and R100). Soybean oil and coconut oil were used as sources of long-chain fatty acid and MCFA, respectively. The feeding trial showed that dietary coconut oil had no effect on weight gain, feed intake or feed conversion. On d 42, serum levels of total cholesterol, low-density lipoprotein cholesterol, and low-density lipoprotein/high-density lipoprotein cholesterol were linearly decreased as the coconut oil level increased (p<0.01). Lipoprotein lipase, hepatic lipase, and total lipase activities were linearly increased as the coconut oil level increased (p<0.01). Abdominal fat weight/eviscerated weight (p = 0.05), intermuscular fat width (p<0.01) and subcutaneous fat thickness (p<0.01) showed a significant quadratic relationship, with the lowest value at R75. These results indicated that replacement of 75% of the soybean oil in diets with coconut oil is the optimum level to reduce fat deposition and favorably affect lipid profiles without impairing performance in broilers.
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Wang, Jianhong,Wang, Xiaoxiao,Li, Juntao,Chen, Yiqiang,Yang, Wenjun,Zhang, Liying Asian Australasian Association of Animal Productio 2015 Animal Bioscience Vol.28 No.2
This study was conducted to investigate the effects of dietary coconut oil as a medium-chain fatty acid (MCFA) source on performance, carcass composition and serum lipids in male broilers. A total of 540, one-day-old, male Arbor Acres broilers were randomly allotted to 1 of 5 treatments with each treatment being applied to 6 replicates of 18 chicks. The basal diet (i.e., R0) was based on corn and soybean meal and was supplemented with 1.5% soybean oil during the starter phase (d 0 to 21) and 3.0% soybean oil during the grower phase (d 22 to 42). Four experimental diets were formulated by replacing 25%, 50%, 75%, or 100% of the soybean oil with coconut oil (i.e., R25, R50, R75, and R100). Soybean oil and coconut oil were used as sources of long-chain fatty acid and MCFA, respectively. The feeding trial showed that dietary coconut oil had no effect on weight gain, feed intake or feed conversion. On d 42, serum levels of total cholesterol, low-density lipoprotein cholesterol, and low-density lipoprotein/high-density lipoprotein cholesterol were linearly decreased as the coconut oil level increased (p<0.01). Lipoprotein lipase, hepatic lipase, and total lipase activities were linearly increased as the coconut oil level increased (p<0.01). Abdominal fat weight/eviscerated weight (p = 0.05), intermuscular fat width (p<0.01) and subcutaneous fat thickness (p<0.01) showed a significant quadratic relationship, with the lowest value at R75. These results indicated that replacement of 75% of the soybean oil in diets with coconut oil is the optimum level to reduce fat deposition and favorably affect lipid profiles without impairing performance in broilers.
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Variable Threshold Valued Tolerance Relation in Incomplete Information System
Liu ping,Xiong xiaoxiao,Yang Junping 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.7
Aiming at the incomplete information systems on the condition of no prior domain knowledge, several known model extension based on the rough set theory are introduced at first, such as the tolerance relation, non-symmetric similarity relation, limited tolerance relation and valued tolerance relation. Then the merits and drawbacks of several existing valued tolerance relations are compared in this article. Next, the experiments on some UCI data sets have been done ,based on the experimental result, the author discuss the relationship between the threshold selection and classification accuracy of statistical valued tolerance relation(SVT) . Directing at the difficulty of selecting a suitable threshold, the author presents a new improved valued tolerance relation (NVT) which can choose proper threshold automatically on the basis of each data set’s feature. Experiment results indicate that the new relation can get better classification accuracy than the other extension models in dealing with the incomplete system which has small incomplete degree
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