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OFPT: OpenFlow based Parallel Transport in Datacenters
( Bo Liu ),( Bo Xu ),( Chao Hu ),( Hui Hu ),( Ming Chen ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.10
Although the dense interconnection datacenter networks (DCNs) (e.g. FatTree) provide multiple paths and high bisection bandwidth for each server pair, the single-path TCP (SPT) and ECMP which are widely used currently neither achieve high bandwidth utilization nor have good load balancing. Due to only one available transmission path, SPT cannot make full use of all available bandwidth, while ECMP`s random hashing results in many collisions. In this paper, we present OFPT, an OpenFlow based Parallel Transport framework, which integrates precise routing and scheduling for better load balancing and higher network throughput. By adopting OpenFlow based centralized control mechanism, OFPT computes the optimal path and bandwidth provision for each flow according to the global network view. To guarantee high throughput, OFPT dynamically schedules flows with Seamless Flow Migration Mechanism (SFMM), which can avoid packet loss in flow rerouting. Finally, we test OFPT on Mininet and implement it in a real testbed. The experimental results show that the average network throughput in OFPT is up to 97.5% of bisection bandwidth, which is higher than ECMP by 36%. Besides, OFPT decreases the average flow completion time (AFCT) and achieves better scalability.
Aloe-emodin suppresses prostate cancer by targeting the mTOR complex 2.
Liu, Kangdong,Park, Chanmi,Li, Shengqing,Lee, Ki Won,Liu, Haidan,He, Long,Soung, Nak Kyun,Ahn, Jong Seog,Bode, Ann M,Dong, Ziming,Kim, Bo Yeon,Dong, Zigang IRL Press] ; Oxford University Press 2012 Carcinogenesis Vol.33 No.7
<P>Phosphatidylinositol 3-kinase (PI3-K) amplification and phosphatase and tensin homolog (PTEN) deletion-caused Akt activation contribute to the development of prostate cancer. Mammalian target of rapamycin complex 2 (mTORC2) is a kinase complex comprised of mTOR, Rictor, mSin1, mLST8/G관L and PRR5 and functions in the phosphorylation of Akt at Ser473. Herein, we report that mTORC2 plays an important role in PC3 androgen refractory prostate cell proliferation and anchorage-independent growth. Aloe-emodin, a natural compound found in aloe, inhibited both proliferation and anchorage-independent growth of PC3 cells. Protein content analysis suggested that activation of the downstream substrates of mTORC2, Akt and PKC관, was inhibited by aloe-emodin treatment. Pull-down assay and in vitro kinase assay results indicated that aloe-emodin could bind with mTORC2 in cells and inhibit its kinase activity. Aloe-emodin also exhibited tumor suppression effects in vivo in an athymic nude mouse model. Collectively, our data suggest that mTORC2 plays an important role in prostate cancer development and aloe-emodin suppresses prostate cancer progression by targeting mTORC2.</P>
Bo Liu,Fan Yi,Jun zhou 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.1
In recent years, the detection and investigation of the middle and the upper atmosphere have been quite active subjects. To acquire information on the middle and the upper atmosphere, we developed the first Fe fluorescence/Boltzmann temperature lidar in Asia. In this paper, the system configuration and data-processing methods of the lidar are described, and some results of lidar observations are presented.
Liu, Hai-Bo,Yu, Daun,Shin, Sung Chul,Park, Hyoung-Ryun,Park, Jong Keun,Bark, Ki-Min Wiley (Blackwell Publishing) 2009 Photochemistry and photobiology Vol.85 No.4
<P>The characteristic fluorescence properties of quercetin-3-O-rhamnoside (QCRM) and quercetin-3-O-rutinoside (QCRT) were studied in CH3OH-H2O and CH3CN-H2O mixed solvents. Although QCRM and QCRT are known as nonfluorescent molecules, significant fluorescence emissions were discovered at 360 nm in CH3OH and CH3CN when they were promoted to the second excited state. The emission band is broad and structureless and the intensity decreases quickly as the H2O composition in the solvent increases. When the amount of H2O exceeds 60% in both mixed solvents, this emission disappears due to the formation of the distorted excited state. This state will be formed due to the strong intermolecular hydrogen bonding between the polar groups of solute and H2O. As the composition of CH3OH or CH3CN in solvent becomes large, the number of molecules having several intramolecular hydrogen bonding increases. Some of these molecules will be changed to a fluorescent species during the decay process, after excitation. The theoretical calculation further supports these results. The change of the lifetimes, quantum yields, and radiative and nonradiative rate constants of molecules was also examined as a function of solvatochromic parameters for CH3OH-H2O and CH3CN-H2O.</P>
Bo Liu,Ju-qin Shen,Zhao-jian Meng,Fu-hua Sun 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.10
As the economy in China enters the new normal, Public-Private Partnerships have been an important measure for alleviating financial tensions and improving the administrative efficiency of the government. Based on the mode of open tendering for the selection of social capital partners for the new profit project, the open tendering procedures were analyzed. In addition, based on an improved TOPSIS model, the evaluation index system for the selection conducts a comprehensive evaluation of six aspects: reputation and performance, water pricing factor, financing program, construction program, operation and maintenance program, and transfer program.
Influence of Vehicle Load Mode on the Response of an Asymmetrically-Loaded Deep Excavation
Bo Liu,Dingwen Zhang,Peisheng Xi 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.8
At present, the research on the influence of vehicle load mode on response of asymmetrically-loaded deep excavation is limited. Based on a deep excavation which is adjacent to the expressway and is subjected to the asymmetric load induced by the weight of embankment and the vehicle load together, this paper presented several vehicle load conversion methods firstly. Then a numerical modelling was performed to simulate the response of deep excavation considering the above methods. Next, a field monitoring of response of deep excavation was performed to verify the simulation results. By comparing the simulated and monitored results, the optimum vehicle load mode was recommended. The results indicate that the vehicle load has a considerable influence on the response of deep excavation. For this study, the equivalent thickness of soil layer method and the improved equivalent thickness of soil layer method are recommended to treat the vehicle load. This paper also analysed the influence factor of the improved equivalent thickness of soil layer method and found the improvement effect of this method rapidly decreases with the increase of retaining wall height. For a very high retaining wall, the improvement effect of this method is limited.
Study on the Formation Mechanism of Seismic Fracture Source of Debris Flow in Strong Seismic Area
( Liu Bo ),( Hu Xiewen ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
The "5.12" Wenchuan Earthquake resulted in a large number of shattering of thin ridges. Induced by heavy rainfall, such high-level shattered mountains lose stability and damage, which will produce a large number of solid materials and significantly increase the hazards of debris flows in the earthquake area. In this paper, the formation mechanism of seismic crack source is studied by large-scale shaking table physical simulation test. Under different inclination of layers conditions, the acceleration, displacement, stress, deformation and failure characteristics of different parts of the model slope are simulated to analyze the seismic response law of thin ridges. The results show that: (1) the horizontal acceleration amplification coefficient of the model increases obviously when the height is above 3/5H from the bottom of the model, and the obvious vertical acceleration amplification effect appears at 3/4H from the bottom; (2) the acceleration response intensity of the hill body of the layered structure model is greater than that of the homogeneous structure model, and the correlation with the horizontal acceleration increases with the increase of the excitation frequency. (3) For the layered structure model, the larger the dip angle of the layer, the larger the top deformation is under the same excitation intensity; (4) For the weak interlayer model, the failure location of the horizontal interlayer model is higher than that of the inclined interlayer model, and the deformation of the thin interlayer model is larger than that of the thick interlayer model.
An adaptive method of multi-scale edge detection for underwater image
Bo, Liu Techno-Press 2016 Ocean systems engineering Vol.6 No.3
This paper presents a new approach for underwater image analysis using the bi-dimensional empirical mode decomposition (BEMD) technique and the phase congruency information. The BEMD algorithm, fully unsupervised, it is mainly applied to texture extraction and image filtering, which are widely recognized as a difficult and challenging machine vision problem. The phase information is the very stability feature of image. Recent developments in analysis methods on the phase congruency information have received large attention by the image researchers. In this paper, the proposed method is called the EP model that inherits the advantages of the first two algorithms, so this model is suitable for processing underwater image. Moreover, the receiver operating characteristic (ROC) curve is presented in this paper to solve the problem that the threshold is greatly affected by personal experience when underwater image edge detection is performed using the EP model. The EP images are computed using combinations of the Canny detector parameters, and the binaryzation image results are generated accordingly. The ideal EP edge feature extractive maps are estimated using correspondence threshold which is optimized by ROC analysis. The experimental results show that the proposed algorithm is able to avoid the operation error caused by manual setting of the detection threshold, and to adaptively set the image feature detection threshold. The proposed method has been proved to be accuracy and effectiveness by the underwater image processing examples.