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- 저자 : Dan Peng (검색결과 57 건)
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Dan Peng,Jing Zhang,Chang-chun Hua,Chang Gao 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.2
Two recent Lyapunov-based methods: delay-partitioning approach and Jensen inequality approach, have reduced the conservatism and the complexity of the stability result for one-dimensional (1-D) time-delay systems, respectively. This paper concerns the analysis of delay-dependent stability for two-dimensional (2-D) discrete systems with interval time-varying delays. By applying a delay partitioning-based Lyapunov function combining with the approaches of 2-D Jensen inequalities, a new delay-dependent stability criterion is derived in terms of linear matrix inequality (LMI). In addition to delay dependence, the obtained criterion is also dependent on the partition size. It is rigorously proved that the authors’ result reduces the conservativeness and computational burden than some recent ones. Numerical examples show the effectiveness and advantage of our result.
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Oviposition decisions in an endoparasitoid under self-superparasitism conditions
Liu Peng-Cheng,Zhao Bin,Cao Dan-Dan,Wei Jian-Rong 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.1
Superparasitism is a widespread phenomenon. Having accepted superparasitism, mated female parasitoids must decide on the sex of each egg they subsequently lay into the same host. Theory predicts that this decision is either based on host quality, when more male eggs are laid in hosts that are already parasitized because they are perceived to be of poorer quality; or more eggs are laid of the sex that is most likely to be a strong larval competitor, i.e. generally females. Anastatus disparis is a facultative endoparasitic egg parasitoid. We used ‘artificial’ hosts to explore outcomes of decision making by A. disparis during superparasitism under a manipulated absence of larval competition. When only one egg was laid it was always female. As the number of eggs laid increased, so more of them were male. This supports the theory that oviposition decisions are based on host quality; more male eggs were laid in hosts that were already parasitized and thus of poorer quality. In a second experiment, eggs were exposed to parasitoids for different periods of time. Half the eggs were dissected to determine the number of parasitoid eggs that had been laid. The remaining eggs were incubated and the number and sex of offspring that ultimately emerged, following larval competition, were recorded. Under superparasitism conditions fierce larval competition ensued; only one offspring survived and they were pre dominantly female. In conclusion, oviposition decisions by female A. disparis accepting self-superparasitism were made based on host quality.
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Design of microspeaker module considering added stiffness
Peng Sun,Dan-Ping Xu,황상문 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.5
Mobile devices are becoming highly multi-functional due to the development of communication technology. The microspeaker moduleused in those devices, such as mobile phones or pads, is also playing important roles inside mobile devices. The conventional microspeakermodules normally have two demerits including a non-standardized total shape for different types of devices and a size toolarge for miniaturization design. This paper reports a novel structure design of a microspeaker module considering the added stiffness tominimize the total dimensions without affecting the acoustic performance. At the same time, a standardized novel microspeaker designwas applied to different types of mobile devices with sustained performance. The finite element method (FEM) was applied for electromagneticanalysis and dynamic analysis. The respond surface method (RSM) was used for optimization. As a design result, the totalvolume was decreased by 51.8%. The simulation showed that compared to the conventional design, the novel design maintains the resonancefrequency and sound pressure level (SPL) value. Prototypes were constructed and acoustic tests were conducted. The simulationresults were verified experimentally. The results revealed the novel design to have a similar resonance frequency with conventional design. In addition, the mean SPL value from 800 Hz to 5 kHz for the conventional and novel designs were maintained with 94.33 dB and94.98 dB, respectively, that means novel design has maintained acoustic performance as conventional design.
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Deep removal of sulfur from real diesel by catalytic oxidation with halogen-free ionic liquid
Dan Liu,Jianzhou Gui,Yong-Ki Park,Shuang Yang,Yuhuan Gao,Xilai Peng,Zhaolin Sun 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.1
A halogen-free task-specific ionic liquid (TSIL) of 1-(2-carboxylic acid) ethyl-3-methylimidazolium bisulfate ([(CH2)2COOHmim] [HSO4]) is applied for deep oxidative desulfurization of real diesel as a catalyst and reaction media. The sulfur level of real diesel can be reduced from 200 to 20.5 μg/g at room temperature with small amount of ionic liquid using H2O2 as an oxidant. The used ionic liquid can be easily recycled and no obvious decrease in catalytic activity can be found after recycling five times.
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Dan Xiao,Xiaoyan Peng,Xiaopeng Liang,Ying Deng,Guofu Xu,Zhimin Yin 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.3
Hot compression tests of as-homogenized Al-Zn-Mg-Cu alloy were performed at the deformation temperaturerange of 350-450 °C and the strain rate range of 0.001-1 s-1. The Arrhenius-type constitutive equation and theAvrami-type model were established to predict the flow behaviors of the alloy respectively. The processing map atthe true strain of 0.92 was developed to evaluate the workability of the alloy and the related microstructures wereinvestigated. The results show that the Avrami-type model has a higher accuracy to predict flow stress than theArrhenius-type constitutive equation. The stable deformation occurs under high temperature or low strain ratemainly owing to the dynamic recrystallization. Flow instability is prone to occur under the condition of low temperatureand high strain rate due to the initiation and the propagation of micro-cracks. According to the processingmap and corresponding microstructure characteristics, the optimum processing parameters are in the temperaturerange of 380-405 °C and the strain rate range of 0.006-0.035 s-1.
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Peng, Shengnan,Wu, Dan,Ge, Zhi,Tong, Meiping,Kim, Hyunjung Elsevier Applied Science Publishers 2017 Environmental pollution Vol.225 No.-
<P><B>Abstract</B></P> <P>The effects of graphene oxide (GO) on the transport and deposition behaviors of colloids with different sizes in packed quartz sand were investigated in both NaCl (10 and 50 mM) and CaCl<SUB>2</SUB> solutions (1 and 5 mM) at pH 6. Fluorescent carboxylate-modified polystyrene latex microspheres (CMLs) with size ranging from 0.2 to 2 μm were utilized as model colloids. Both breakthrough curves and retained profiles of colloids in the presence and absence of GO in suspensions under all examined solution conditions were analyzed. The breakthrough curves of all three different-sized CMLs with GO were higher yet the retained profiles were lower than those without GO at both examined ionic strengths in NaCl solutions. The observation showed that GO increased the transport and decreased the deposition of all three different-sized CMLs in NaCl solutions. However, in CaCl<SUB>2</SUB> solutions, opposite observation was achieved at two different ionic strength conditions. Specifically, the presence of GO increased the transport and decreased the deposition of all three different-sized CMLs in 1 mM CaCl<SUB>2</SUB> solutions, whereas, it decreased the transport and increased the deposition of all three different-sized CMLs in 5 mM CaCl<SUB>2</SUB> solutions. Comparison the breakthrough curves and retained profiles of CMLs versus those of GO yielded that the overall transport and deposition behaviors of all three different-sized CMLs with GO copresent in suspensions agreed well with the transport and deposition behaviors of GO under all examined conditions. The transport and deposition behaviors of CMLs in packed porous media clearly were controlled by those of GO under the conditions investigated in present study due to the adsorption of CMLs onto GO surfaces. Our study showed that once released into natural environment, GO would adsorb (interact with) different types of colloids and thus have significant influence on the fate and transport of colloids in porous media.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The transport of CMLs in quartz sand was affected by GO present in suspensions. </LI> <LI> GO increased all three sized CMLs transport in quartz sand in NaCl solutions. </LI> <LI> GO had opposite effects on CMLs transport at low and high IS in CaCl<SUB>2</SUB> solutions. </LI> <LI> Adsorption of CMLs onto GO surfaces led to altered transport of CMLs. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Peng Jiang,Xiujuan Fu,Hong Niu,Siwei Chen,Feifei Liu,Yu Luo,Dan Zhang,Hui Lei 대한약학회 2023 Archives of Pharmacal Research Vol.46 No.6
Strains of the fungal genus Pestalotiopsis are reported as large promising sources of structurally varied biologically active metabolites. Many bioactive secondary metabolites with diverse structural features have been derived from Pestalotiopsis. Moreover, some of these compounds can potentially be developed into lead compounds. Herein, we have systematically reviewed the chemical constituents and bioactivities of the fungal genus Pestalotiopsis, covering a period ranging from January 2016 to December 2022. As many as 307 compounds, including terpenoids, coumarins, lactones, polyketides, and alkaloids, were isolated during this period. Furthermore, for the benefit of readers, the biosynthesis and potential medicinal value of these new compounds are also discussed in this review. Finally, the perspectives and directions for future research and the potential applications of the new compounds are summarized in various tables.
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Dan Xiao,Kaisen Huang,Qingyong Chen,Baotao Huang,Wei Liu,Yong Peng,Mao Chen,Dejia Huang,Tong Zou,Jiefu Yang 한국유전학회 2015 Genes & Genomics Vol.37 No.7
Apolipoprotein B plays a central role in lipoprotein metabolism. Many studies have evaluated the association between Apolipoprotein B gene polymorphisms (XbaI, EcoRI, SpIns/Del, MspI) and the risk for coronary artery disease and myocardial infarction. However, the results remain inconsistent, particularly among different populations. To more precisely determine the association between Apolipoprotein B gene polymorphisms and coronary artery disease/myocardial infarction risk, we performed a meta-analysis via a comprehensive search of electronic databases (up to February 1st, 2015), odds ratios (OR) and 95 % confidence intervals were calculated using a fixed or random effect model. A total of 47 studies, with 9411 coronary artery disease/myocardial infarction cases and 9082 controls, were included in this meta-analysis. The combined results revealed significant associations between an increased risk of coronary artery disease/myocardial infarction and EcoRI (AA vs GG: OR 1.511, 95 % confidence interval (CI) 1.098, 2.078) and SpIns/Del (DD vs II: OR 1.331, 95 % CI 1.064, 1.665) alleles in the general population. In a subgroup analysis stratified by ethnicity, the T allele of the XbaI variant was associated with a decreased risk in Caucasians, whereas it was associated with an increased risk among the East Asian population. No significant correlation was detected between the A allele of the MspI variant and the coronary artery disease/myocardial infarction risk in either the general population or any ethnic subgroup. The results of our study suggest that Apolipoprotein B gene polymorphisms may affect the coronary artery disease/myocardial infarction susceptibility and these effects may display notable discrepancies among different populations.
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