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Search Results: 1 - 10 of 55525 matches for " Bo Xiao1 "
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MicroRNA let-7c inhibits Bcl-xl expression and regulates ox-LDL-induced endothelial apoptosis
Bing Qin1, Bo Xiao1, Desheng Liang2, Ye Li1, Ting Jiang1 & Huan Yang1,*
BMB Reports , 2012,
Abstract: Endothelial cells (ECs) apoptosis induced by oxidizedlow-density lipoprotein (ox-LDL) is thought to play a criticalrole in atherosclerosis. MicroRNAs (miRNAs) are a class ofnoncoding RNAs that posttranscriptionally regulate the expressionof genes involved in diverse cell functions, includingdifferentiation, growth, proliferation, and apoptosis. MiRNAlet-7 family is known to be involved in the regulation of cellapoptosis. However, the function of let-7 in ox-LDL inducedECs apoptosis and atherosclerosis is still unknown. Here, weshow that let-7c expression was markedly up-regulated inox-LDL induced apoptotic human umbilical cord veinendothelial cells (HUVECs). Let-7c over-expression enhancedapoptosis in ECs whereas inhibition of let-7c could partlyalleviate apoptotic cell death mediated by ox-LDL. Searchingfor how let-7c affected apoptosis, we discovered that antiapoptoticprotein Bcl-xl was a direct target of let-7c in ECs. Ourdata suggest that let-7c contributes to endothelial apoptosisthrough suppression of Bcl-xl.
Collision Detection and the Design of Fair and Stable MAC Scheme for Wireless Ad Hoc Networks  [PDF]
Yongkang Xiao, Rong Xiao, Bo Sun
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.53B2065
Abstract: Fairness and stability guarantee among TCP flows is very stubborn in wireless ad hoc networks. There is not a MAC protocol that can fulfill this acquirement until now. In this paper, we firstly reveal the in-depth causes of the severe TCP unfairness and instability problems in IEEE 802.11-based multihop networks. Then we utilize the collision detection mechanism of the IEEE 802.11 protocol which is often ignored by most of the people to design a novel collision detection mechanism-based MAC (CDMB-MAC) scheme to solve the short-term and long-term fairness and stability issues while providing a good aggregate throughput in many topologies.
A User Selection Method in Advertising System  [PDF]
Shiyi XIONG, Zhiqing LIN, Bo XIAO
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2010, DOI: 10.4236/ijcns.2010.31007
Abstract: It’s important for mobile operators to recommend new services. Traditional method is sending advertising messages to all mobile users. But most of users who are not interested in these services treat the messages as Spam. This paper presents a method to find potential customers who are likely to accept the services. This method searchs the maximum frequent itemsets which indicate potential customers’ features from a large data set of users’ information, then find potential customers from those maximum frequent itemsets by using a bayesian network classifier. Experimental results demonstrate this method can select users with higher accuracy.
Large-scale Surveillance System based on Hybrid Cooperative Multi-Camera Tracking  [PDF]
Xiao Yan, Dan Xu, Bo Yao
Open Journal of Applied Sciences (OJAppS) , 2013, DOI: 10.4236/ojapps.2013.31B016
Abstract: In this paper, we proposed an optimized real-time hybrid cooperative multi-camera tracking system for large-scale au-tomate surveillance based on embedded smart cameras including stationary cameras and moving pan/tilt/zoom (PTZ) cameras embedded with TI DSP TMS320DM6446 for intelligent visual analysis. Firstly, the overlapping areas and projection relations between adjacent cameras' field of view (FOV) is calculated. Based on the relations of FOV ob-tained and tracking information of each single camera, a homography based target handover procedure is done for long-term multi-camera tracking. After that, we fully implemented the tracking system on the embedded platform de-veloped by our group. Finally, to reduce the huge computational complexity, a novel hierarchical optimization method is proposed. Experimental results demonstrate the robustness and real-time efficiency in dynamic real-world environ-ments and the computational burden is significantly reduced by 98.84%. Our results demonstrate that our proposed sys-tem is capable of tracking targets effectively and achieve large-scale surveillance with clear detailed close-up visual features capturing and recording in dynamic real-life environments.
Exploration the Method of Low Dose Coronary Artery Imaging with Dual-Source CT  [PDF]
Zhiwei Huang, Bo Xiao, Lisha Zhong
Journal of Biosciences and Medicines (JBM) , 2013, DOI: 10.4236/jbm.2013.11002
Abstract: Objective: On the premise that the image quality meets the requirements of clinical diagnosis, we explored the methods to reduce the radiation dose of coronary artery imaging with Dual-Source CT (DSCT). Methods: We randomly selected 200 patients with coronary heat disease (BIM<25kg/m2), applied the scanning technology of regulating the dose of heart electric pulse (AUTO) on the 100 patients in group A. In this group for different heart rate we chose different full dose exposure time window. For the 100 patients in group B, we used conventional full dose (OFF) scan mode. The DSCT automatically selected the best time and phase to reconstruct the image. We used the 5 point system to evaluate the image quality, measured and compared the image noise and radiation dose. When P<0.05, the differences between the two groups have statistical significance. Results: The image quality scores between the two groups showed no significant difference (P > 0.05). The average image noise in group A is (41.76 ± 7.98) HU, in group B the average image noise is (43.97 ± 3.88) HU, the dif- ference between the two groups was not statistically significant (P>0.05). The average CTDIvol of group A and B were (20.63 ± 2.24) mGy, (38.11 ± 10.69) mGy, respectively, then P <0.01. The average DLP of group A and B are (235.75 ± 28.64) mGycm and (492.59 ± 125.49) mGycm respectively, then P <0.01, the dif- ference of radiation dose had statistical significance (P<0.05). Conclusions: For coronary artery imaging with DSCT the heart electric pulse (AUTO) regulation technology can meet the diagnostic requirements and effectively reduce the radiation dose.
Clinical use of calcium sulphate in bone regeneration therapy: Case report
Radulovi? Milan 1,Brkovi? Bo?idar
Stomatolo?ki Glasnik Srbije , 2003, DOI: 10.2298/sgs0301024r
Abstract: It is well known that a variety of materials has been used to fill bone defects after oral surgery procedures. In this study, we showed 2 patients with large osseus defects after oral surgery procedures which were filled with calcium sulphate. The use of this alloplastic material should indicate on effective bone regeneration therapy.
Existence of Multiple Solutions of a Second-Order Difference Boundary Value Problem
Bo Zheng,Huafeng Xiao
International Journal of Mathematics and Mathematical Sciences , 2010, DOI: 10.1155/2010/907453
Abstract: This paper studies the existence of multiple solutions of the second-order difference boundary value problem Δ2(?1)
The Existence of Multiple Periodic Solutions of Nonautonomous Delay Differential Equations
Huafeng Xiao,Bo Zheng
Journal of Applied Mathematics , 2011, DOI: 10.1155/2011/829107
Abstract: We study the multiplicity of periodic solutions of nonautonomous delay differential equations which are asymptotically linear both at zero and at infinity. By making use of a theorem of Benci, some sufficient conditions are obtained to guarantee the existence of multiple periodic solutions. 1. Introduction The existence and multiplicity of periodic solutions of delay differential equations have received a great deal of attention. In 1962, Jones [1] firstly investigated the existence of periodic solutions to the following scalar equation: By making use of Browder fixed point theorem, the author showed that there exist periodic solutions of (1.1) for each . Since then, various fixed point theorems have been used to study the existence of periodic solutions of delay differential equations(cf. [2]). As pointed out in [3], by making change of variable , (1.1) turns into In 1974, Kaplan and Yorke [4] studied the following more general form of??(1.2) They introduced a technique which translates the problem of the existence of periodic solutions of a scalar delay differential equation to that of the existence of critical points of an associated ordinary differential system. Using this method, they proved that (1.3) has a periodic solution with minimal period 4 (resp., 6) when (1.3) has one delay (resp., two delays). In this direction, Fei, Li and He did some excellent work and got some signification results (cf. [5–8]). Many other approaches, such as coincidence degree theory, the Hopf bifurcation theorem, and the Poincaré-Bendixson theorem, have also been used to study the existence of periodic solutions of delay differential equations (cf. [9, 10]). However, most of those results are concerned with scalar delay equations. In 2005, Guo and Yu [3] studied vector delay differential system (1.2). They built a variational structure for (1.2) on certain suitable spaces. Then they reduced the existence of periodic solutions of (1.2) to that of critical points of an associated variational functional. By making use of pseudoindex theory, they obtained some sufficient conditions to guarantee the existence of multiple periodic solutions. In spite of so many papers on periodic solutions of delay differential equations, there are a quite few researches on nonautonomous case (see for example [11]). The main goal of this paper is to investigate the following nonautonomous system: We assume that there exists such that is the gradient of with respect to , and as uniformly for , as uniformly for , where are symmetric continuous -periodic matrix functions. Hypothesis is known
Journal of the Chilean Chemical Society , 2006, DOI: 10.4067/S0717-97072006000300007
Abstract: a high performance ion chromatographic (hpic) method for the determination of nine components in bayer liquors was reported. formic, acetic, propionic, oxalic, succinic, glutaric anion, f-, cl-, and so42- were separated and determined by high performance ion chromatography with conductivity detector. the analytes were removed from bayer liquor by using an ion-exchange resin column. the chromatographic separation was achieved with only one ionpac as11-hc column thermostated at 30 °c. the precision results showed that the repeatability and reproducibility were <2.94 and <1.37%, respectively. the accuracy of the method was assessed by the recoveries ranging from 86.3 to 105.6 %. under optimum conditions the detection limits ranged from 0.008 to 0.053 mg/l
On the anomalous dimensions of the multiple pomeron exchanges
Xiao, Bo-Wen
High Energy Physics - Phenomenology , 2007, DOI: 10.1016/j.nuclphysa.2007.10.013
Abstract: High energy hard scattering in large $N_{c}$ limit can be described by the QCD dipole model. In this paper, single, double and triple BFKL pomeron exchange amplitudes are computed explicitly within the dipole model. Based on the calculation, the general formula $\gamma^{(k)*}_{0}=\chi^{-1}(k\chi({1/2}))$ which governs the anomalous dimension of $1\Rightarrow k$ amplitude is conjectured. As far as the unitarity problem is concerned, we find that the anomalous dimension $\gamma$ varies from graph to graph due to the DGLAP evolution. In the end, a comparison between this computation and reggeon field theory is provided.
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