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An Experiment of K-Means Initialization Strategies on Handwritten Digits Dataset  [PDF]
Boyang Li
Intelligent Information Management (IIM) , 2018, DOI: 10.4236/iim.2018.102003
Abstract: Clustering is an important unsupervised classification method which divides data into different groups based some similarity metrics. K-means becomes an increasing method for clustering and is widely used in different application. Centroid initialization strategy is the key step in K-means clustering. In general, K-means has three efficient initialization strategies to improve its performance i.e., Random, K-means++ and PCA-based K-means. In this paper, we design an experiment to evaluate these three strategies on UCI ML hand-written digits dataset. The experiment result shows that the three K-means initialization strategies find out almost identical cluster centroids, and they have almost the same results of clustering, but the PCA-based K-means strategy significantly improves running time, and is faster than the other two strategies.
Muonium-Antimuonium Oscillations in an extended Minimal Supersymmetric Standard Model with right-handed neutrinos
Liu, Boyang
High Energy Physics - Phenomenology , 2008, DOI: 10.1103/PhysRevD.79.015001
Abstract: The electron and muon number violating muonium-antimuonium oscillation process in an extended Minimal Supersymmetric Standard Model is investigated. The Minimal Supersymmetric Standard Model is modified by the inclusion of three right-handed neutrino superfields. While the model allows the neutrino mass terms to mix among the different generations, the sneutrino and slepton mass terms have only intra-generation lepton number violation but not inter-generation lepton number mixing. So doing, the muonium-antimuonium conversion can then be used to constrain those model parameters which avoid further constraint from the $\mu\to e\gamma$ decay bounds. For a wide range of parameter values, the contributions to the muonium-antimuonium oscillation time scale are at least two orders of magnitude below the sensivity of current experiments. However, if the ratio of the two Higgs field VEVs, $\tan\beta$, is very small, there is a limited possibility that the contributions are large enough for the present experimental limit to provide an inequality relating $\tan\beta$ with the light neutrino mass scale $m_\nu$ which is generated by see-saw mechanism. The resultant lower bound on $\tan\beta$ as a function of $m_\nu$ is more stringent than the analogous bounds arising from the muon and electron anomalous magnetic moments as computed using this model.
Research on Motion Attention Fusion Model-Based Video Target Detection and Extraction of Global Motion Scene  [PDF]
Long Liu, Boyang Fan, Jing Zhao
Journal of Signal and Information Processing (JSIP) , 2013, DOI: 10.4236/jsip.2013.43B006

For target detection algorithm under global motion scene, this paper suggests a target detection algorithm based on motion attention fusion model. Firstly, the motion vector field is pre-processed by accumulation and median filter; Then, according to the temporal and spatial character of motion vector, the attention fusion model is defined, which is used to detect moving target; Lastly, the edge of video moving target is made exactly by morphologic operation and edge tracking algorithm. The experimental results of different global motion video sequences show the proposed algorithm has a better veracity and speedup than other algorithm.

Dissolution of Expanded Polystyrene in Cycloalkane Solutions  [PDF]
Shiying Tao, Boyang Li, Hui Huang
Open Journal of Applied Sciences (OJAppS) , 2018, DOI: 10.4236/ojapps.2018.810037
Abstract: Feasibility of dissolution and utilization of expanded polystyrene in cycloalkane solutions was investigated in this work. The dissolution process of expanded polystyrene in several cycloalkane solutions decalin, cyclohexane and methyl cyclohexane was studied. The effect of dissolution temperature, mechanical agitation, ultrasonic wave and stirring rate was studied under optimized conditions. Mass transfer coefficients were fitted. The results showed that the dissolution rate of expanded polystyrene in different cycloalkane solutions was ranked as decalin > methyl cyclohexane > cyclohexane; higher dissolution temperature and faster stirring rate could speed up the dissolution of expanded polystyrene; the effect of mechanical agitation was superior to ultrasonic condition; the solubility of top face was better than side face and under face.
Boyang Jia,Lijuan Wang
BioResources , 2010,
Abstract: Nickel-based activated carbon was prepared from coconut shell activated carbon by electroless plating with palladium-free activation. The materials were characterized by scanning electron microscopy (SEM), X-ray energy dispersion spectroscopy (EDS), vibrating sample magnetometry (VSM), and vector network analyzer, respectively. The results show that the surface of the activated carbon was covered by a Ni-P coating, which was uniform, compact, and continuous and had an obvious metallic sheen. The content of P and Ni was 2.73% and 97.27% in the coating. Compared with the untreated activated carbon, the real permeability μ′ and imaginary permeability μ″ of Ni-based activated carbon became greater, whereas the real permittivity ε′ and imaginary permittivity ε″ became smaller. Also, the plated activated carbon was magnetic, making it suitable for some special applications. In general, the method reported here might be a feasible procedure to coat activated carbon with other magnetic metals, which may find application in various areas.
One-loop renormalization group study of boson-fermion mixtures
Boyang Liu,Jiangping Hu
Physics , 2012, DOI: 10.1142/S0217979212501974
Abstract: A weakly interacting boson-fermion mixture model was investigated using Wisonian renormalization group analysis. This model includes one boson-boson interaction term and one boson-fermion interaction term. The scaling dimensions of the two interaction coupling constants were calculated as 2-D at tree level and the Gell-Mann-Low equations were derived at one-loop level. We find that in the Gell-Mann-Low equations the contributions from the fermion loops go to zero as the length scale approaches infinity. After ignoring the fermion loop contributions two fixed points were found in 3 dimensional case. One is the Gaussian fixed point and the other one is Wilson-Fisher fixed point. We find that the boson-fermion interaction decouples at the Wilson-Fisher fixed point. We also observe that under RG transformation the boson-fermion interaction coupling constant runs to negative infinity with a small negative initial value, which indicates a boson-fermion pairing instability. Furthermore, the possibility of emergent supersymmetry in this model was discussed.
Quantum Fluctuation Driven First-order Phase Transitions in Optical Lattices
Boyang Liu,Jiangping Hu
Physics , 2013, DOI: 10.1103/PhysRevA.92.013606
Abstract: We study quantum fluctuation driven first-order phase transitions of a two-species bosonic system in a three-dimensional optical lattice. Using effective potential method we find that the superfluid-Mott insulator phase transition of one type of bosons can be changed from second-order to first-order by the quantum fluctuations of the other type of bosons. The study of the scaling behaviors near the quantum critical point shows that the first-order phase transition has a different universality from the second-order one. We also discuss the observation of this exotic phenomenon in the realistic cold-atom experiments.
Antitumor effects of the molecule-downsized immunoconjugate composed of lidamycin and Fab’ fragment of monoclonal antibody directed against type IV collagenase
Fengqiang Wang,Boyang Shang,Yongsu Zhen
Science China Life Sciences , 2004, DOI: 10.1360/02yc0176
Abstract: Type IV collagenase plays an important role in tumor invasion and metastasis through cleaving type IV collagen in the basement membrane and extracellular matrix. In this study a molecule-downsized immunoconjugate (Fab’-LDM) was constructed by linking lidamycin (LDM), a highly potent antitumor antibiotic, to the Fab’ fragment of a monoclonal antibody directed against type IV collagenase and its antitumor effect was investigated. As assayed in 10% SDS-PAGE gel, the molecular weight of Fab’-LDM conjugate was 65 kD with a 1: 1 molecular ratio of Fab’ and LDM. The Fab’-LDM conjugate maintained most part of the immunoreactivity of Fab’ fragment to both type IV collagense and mouse hepatoma 22 cells by ELISA. By MTT assay, Fab’-LDM conjugate showed more potent cytotoxicity to hepatoma 22 cells than that of LDM. Administered intravenously, Fab’-LDM conjugate proved to be more effective against the growth of subcutaneously transplanted hepatoma 22 in mice than free LDM in two experiment settings. In Experiment I, the drugs were given intravenously on day 1 and day 8. Fab’-LDM at the doses of 0.025 mg/kg, 0.05 mg/kg and 0.1 mg/kg inhibited tumor growth by 76.7%, 93.3% and 94.8%, while free LDM at 0.05 mg/kg inhibited tumor growth by 76.1%, respectively. In experiment II, the drugs were given intravenously on day 4 and day 11, Fab’-LDM at the doses of 0.025 mg/kg and 0.05 mg/kg inhibited tumor growth by 74.2%, 80.9%, while free LDM at 0.05 mg/kg inhibited tumor growth by 60.5%, respectively. In terms of survival time, Fab’-LDM was more effective than free LDM. The results suggest that the molecule-downsized immunoconjugate directed against type IV collagenase is of high efficacy in experimental cancer therapy.
The Thoughts and Realization of the “Free Form”

Sun Boyang,

现代图书情报技术 , 1998,
Abstract: This paper discusses the necessity of supporting free form output in a computer management system.The author advances some features the statistical unit of a computer management system must have.Based on experiences of an application,these features are explained in detail.At the end,the key technical theory is analyzed.


地球物理学报 , 2003,
Abstract: The elastic dislocation theory is an important part of seismology. Since the fracture of fault can be regarded as the displacement mutation in elastic medium, under given condition the displacement field can be studied with static elastic dislocation theory, and the change of elastic displacement field can be also deduced from the dislocation theory. The dislocation form proposed in this paper is based on the two-phase saturated medium. Because lots of dilatancy fissure appear in fault before earthquake, and then the water draw in it is saturated, the rock becomes two-phase saturated medium. It is on the grounds of DD model by Nur(1972), analogue hypothesis of Scholz(1973) etc. and interpretations of Whitcomb(1973) and Feng(1998) etc. to some symptoms before-earthquake process. Using Green function represented by Bassil function in two-phase saturated medium of action concentrated force and elasticity dynamic equation, with Hansen Vector transformation to Helmholtz equation, the authors obtain the displacement field of dislocation on the half-space of two-phase saturated medium. The dislocation displacement in half-space of single phase was studied by Stekette(1958) first. Later, Ben-Memahem and Singh(1964)(1981) studied it with Hansen Vector, and Chen(1974) generalized it to multi-layer elastic space with Haskell matrix. After dislocation of single phase the displacement is stable, but it changes in fact. Authors hope that the earth surface deformation is variable after earhquake, that will be explained according to the theory about dislocation on the half-space of two-phase saturated medium.
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