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Kernel Reference Set and Its Computation Algorithm
Ding-Yuan Bian,Qi-Wei Ge,Qian Zhu,Qian-Ming Shao 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
This paper proposes a new concept of graphs: kernel reference set. A kernel reference set is a fraction of vertices in a graph such that if their positions are known, positions of all other vertices can be derived from information of the distance matrix. We present an algorithm to find kernel reference set of graphs. Because the problem of kernel reference set is firstly proposed in this paper, and the theoretical limit of computation complexity is unknown currently. So we implement our algorithm with C to do the simulation. From simulation results, we verified the validity of our algorithm and evaluate its performance. Inspired by anchor nodes in wireless sensor networks, kernel reference set could be used to analyze anchorbased localization schemes of WSNs applications such as coalmine security monitoring, etc.
Thermo-mechanical analysis of angular contact ball bearing
Wei Bian,Zhenhua Wang,Juntang Yuan,Weiwei Xu 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.1
The thermal-mechanical character, which is difficult to ensure because of the lack of a corresponding theory and tool, has a significanteffect on the dynamics of bearings. It even leads to a sudden failure of bearings in a working situation. In this research, a thermal deformationmodel was established, based on the analysis of temperature effect on the basic size of angular contact ball bearing. And thetransmission from rolling size to bearing axial stiffness was explicit. On the basis of the variation of Hertz contact stiffness and thechange of initial contact angle of angular contact ball bearing caused by temperature rise, a “Thermo- mechanical” model of bearing wasproposed. According to this model, using the corresponding calculation procedure programmed by MATLAB, the effect of bearing temperatureon the axial stiffness has been studied. And the correctness of this model was verified with experiments. Some design suggestionshave been made for the decision of bearing preload: to prevent the bearing failure caused by overheating.
Tang Xue-lin,Bian Li-yuan,Wang Fu-jun,Li Xiao-qin,Hao Man 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.6
A cavitation model with thermodynamic effects for cavitating flows in a diffuser-type centrifugal pump is developed based on the bubble two-phase flow model. The proposed cavitation model includes mass, momentum, and energy transportations according to the thermodynamic mechanism of cavitation. Numerical simulations are conducted inside the entire passage of the centrifugal pump by using the proposed cavitation model and the renormalization group-based k −ε turbulent model coupled with the energy transportation equation. By using the commercial computational fluid dynamics software FLUENT 6.3, we have shown that the predicted performance characteristics of the pump, as well as the pressure, vapor, and density distributions in the impeller, agree well with that calculated by the full cavitation model. Simulation results show that cavitation initially occurs slightly behind the inlet of the blade suction surface, i.e., the area with maximum vapor concentration and minimum pressure. The predicted temperature field shows that the reduction in temperature restrains the growth of cavitating bubbles. Therefore, the thermodynamic effect should be treated as a necessary factor in cavitation models. Comparison results validate the efficiency and accuracy of the numerical technique in simulating cavitation flows in centrifugal pumps.
An Adaptive JPEG Steganographic Method Based on Weight Distribution for Embedding Costs
( Yi Sun ),( Guangming Tang ),( Yuan Bian ),( Xiaoyu Xu ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.5
Steganographic schemes which are based on minimizing an additive distortion function defined the overall impacts after embedding as the sum of embedding costs for individual image element. However, mutual impacts during embedding are often ignored. In this paper, an adaptive JPEG steganographic method based on weight distribution for embedding costs is proposed. The method takes mutual impacts during embedding in consideration. Firstly, an analysis is made about the factors that affect embedding fluctuations among JPEG coefficients. Then the Distortion Update Strategy (DUS) of updating the distortion costs is proposed, enabling to dynamically update the embedding costs group by group. At last,a kind of adaptive JPEG steganographic algorithm is designed combining with the update strategy and well-known additive distortion function . The experimental result illustrates that the proposed algorithm gains a superior performance in the fight against the current state-of-the-art steganalyzers with high-dimensional features.
( Hui Jing ),( You Jin Dai ),( Yuan Yuan Bian ),( Hui Li ),( Xiao Jin Cui ),( Xiao Jie Yu ),( Song You ),( Feng Qing Hu ) 한국미생물 · 생명공학회 2012 Journal of microbiology and biotechnology Vol.22 No.7
Based on their respective antitumor and thrombolytic activities, the superantigen staphylococcal enterotoxin C2 (SEC2) and staphylokinase (Sak) were chosen for the construction of the novel chimeric proteins Sak-linker- SEC2 and SEC2-linker-Sak using a linker composed of nine Ala residues. Both chimeric proteins possessed nearly the same PBMC proliferation stimulating activity and antitumor activity as SEC2 and thrombolytic activity as Sak. Neither the SEC2 or Sak component of each chimeric protein affected the activity of the other component. The results presented in this study provide a possible strategy to prevent and cure tumor thrombus.
Knockout of the EgriBLOS2 gene results in the transparent integuments of Ectropis grisescens larvae
Li Jia-Li,Zhuang Xiang-Lin,Yuan Ting-Ting,Cai Xiao-Ming,Luo Zong-Xiu,Bian Lei,Chen Zong-Mao,Li Zhao-Qun,Liu Nai-Yong 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.1
The body colors of insects have evolved specialized roles in body protection, signaling and physiology. In some case, the larvae can camouflage their body colors to adapt the habitants and protect themselves. However, the genetic and molecular basis on larval body colors of the tea geometrid, Ectropis grisescens, remains poorly known. Here, we reported an effect of the lysosome-related organelles complex-1, subunit 2 (EgriBLOS2) gene knockout on larval integuments of E. grisescens, by using a clustered regularly interspaced short palindromic repeat (CRISPR)/CRISPR-associated protein 9 (Cas9) system. Combining transcriptomic data and PCR approaches, we first identified the EgriBLOS2 gene from E. grisescens, which encoded 137 amino acids and comprised 3 introns. In the phylogenetic analysis, EgriBLOS2 clustered in the Lepidoptera clade with high conservation to members in other lepidopteran species. Developmental expression profiles revealed that EgriBLOS2 was constantly tran scribed at each stage, in which its expression was significantly lower in 2nd instar larvae than that of other instars. After injecting EgriBLOS2-specific guide RNA and Cas9 messenger RNA into eggs, 70% of larvae showed the translucent integuments in G0 generation, with an emphasis on black splayed patterns in the 2nd and 8th segments of abdomens. However, some typical characteristics of larvae were not obviously changed in mutant instars, such as ocelli, mouthparts and other appendants. This study has unraveled the roles of EgriBLOS2 in the formation of larval integument colors, and provides an alternative strategy for pest management based on the colors in this species.
Na Sun,Tong Yu,Jun-Xing Zhao,Yaogui Sun,Junbing Jiang,Zhi-Bian Duan,WenkuiWang,Yuan-Liang Hu,Hai-Min Lei,HongquanLi 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.1
Twenty natural compounds isolated fromtraditional Chinese medicines were examined for theirantiviral activities against PCV2 in vitro. Antiviral activitywas analyzed by the assays of blocking of virus entry,inhibition of virus replication and inactivation of virusparticles in the virus suspension. 50% cytotoxic concentration(CC50) and 50% effective concentration (EC50) for eachcompound were determined by using the MTT method andimmunofluorescence assay (IFA), respectively. The resultsobtained from the inhibition of virus replication andinactivation of virus particles showed that the maximuminhibition rates for matrine and scutellarin were 57 and72.69% and their SI were 29.87 and 18.66, respectively. However, the results from the assays of inhibition of virusentry and inhibition of virus replication demonstrated thatboth aesculetin and arecoline hydrochloride stimulatedPCV2 replication, with the maximum stimulation rate of387.3 and 219.4%. In summary, both matrine and scutellarinhad antiviral activity against PCV2, while aesculetin andarecoline hydrochloride promoted PCV2 infection replicationin vitro.
Ying-Xiao Fu,Jian-Hong Gu,Yi Wang,Yan Yuan,Xue-Zhong Liu,Jian-Chun Bian,Zong-Ping Liu 대한수의학회 2015 Journal of Veterinary Science Vol.16 No.2
The purpose of this study was to determine whether the Ca2+ signaling pathway is involved in the ability of osteoprotegerin (OPG) to inhibit osteoclast differentiation and maturation. RAW264.7 cells were incubated with macrophage colony-stimulating factor (M-CSF) + receptor activator of nuclear factor-κB ligand (RANKL) to stimulate osteoclastogenesis and then treated with different concentrations of OPG, an inhibitor of osteoclast differentiation. The intracellular Ca2+ concentration [Ca2+]i and phosphorylation of Ca2+/calmodulin-dependent protein kinase II (CaMKII) in the different treatment groups were measured by flow cytometry and Western blotting, respectively. The results confirmed that M-CSF + RANKL significantly increased [Ca2+]i and CaMKII phosphorylation in osteoclasts (p < 0.01), and that these effects were subsequently decreased by OPG treatment. Exposure to specific inhibitors of the Ca2+ signaling pathway revealed that these changes varied between the different OPG treatment groups. Findings from the present study indicated that the Ca2+ signaling pathway is involved in both the regulation of osteoclastogenesis as well as inhibition of osteoclast differentiation and activation by OPG.