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Search Results: 1 - 10 of 42003 matches for " SU Yi "
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Electrical Lie Algebra of Classical Types
Yi Su
Mathematics , 2014,
Abstract: We investigate the structure of electrical Lie algebras of finite Dynkin type. These Lie algebras were introduced by Lam-Pylyavskyy in the study of \textit{circular planar electrical networks}. The corresponding Lie group acts on such networks via some combinatorial operations studied by Curtis-Ingerman-Morrow and Colin de Verdi\`{e}re-Gitler-Vertigan. Lam-Pylyavskyy studied the electrical Lie algebra of type $A$ of even rank in detail, and gave a conjecture for the dimension of electrical Lie algebras of finite Dynkin types. We prove this conjecture for all classical Dynkin types, that is, $A$, $B$, $C$, and $D$. Furthermore, we are able to explicitly describe the structure of the corresponding electrical Lie algebras as the semisimple product of the symplectic Lie algebra with its finite dimensional irreducible representations.
What Causes the Differences in Management Practices between US and UK? An Application of Decomposition Analysis on Firms across Countries  [PDF]
Yi Su, Baoding Liu, Dan Li
Theoretical Economics Letters (TEL) , 2018, DOI: 10.4236/tel.2018.810109
Abstract: The aim of this study is to examine what makes the differences of management practices between the United States and the United Kingdom using decomposition analysis. First, this study analyzes the determinants of management practices, and does the empirical research. Determinants of management practices are concluding product market competition, ownership, firm age, human resources (education, working hours, and payment). Essentially we argue that the differences (if any) between US and UK’s management practices can be expanded by product market competition and education. The results demonstrate that education (managers’ degree and employees’ degree) is positively correlated with management practice gap, but the impact of competition on management practices gap is negative. In particular, employees’ degree variables explained approximately 70% of the management gap.
Fast Detection of GPR Objects with Cross Correlation and Hough Transform
Jian Wang;Yi Su
PIER C , 2013, DOI: 10.2528/PIERC13022510
Abstract: A GPR object detection algorithm delivers a promising performance using the Hough transform through a high computational load. This paper presents a fast Hough-based algorithm. To reduce the parameter space of the Hough transform, first, two parameters for a reflection hyperbola were estimated using cross correlation between adjacent A-scans. Next, only a 1D Hough transform is necessary to detect an object compared with the 3D transform, which comprises the traditional Hough-based methods. Our method is compared with three other detection methods using field data. The results show that the proposed method has an encouraging detection ability and high computational efficiency.
Dipolar spinor Bose-Einstein condensates
Su Yi,Han Pu
Physics , 2008,
Abstract: Under many circumstances, the only important two-body interaction between atoms in ultracold dilute atomic vapors is the short-ranged isotropic s-wave collision. Recent studies have shown, however, that situations may arise where the dipolar interaction between atomic magnetic or electric dipole moments can play a significant role. The long-range anisotropic nature of the dipolar interaction greatly enriches the static and dynamic properties of ultracold atoms. In the case of dipolar spinor condensates, the interplay between the dipolar interaction and the spin exchange interaction may lead to nontrivial spin textures. Here we pay particular attention to the spin vortex state that is analogous to the magnetic vortex found in thin magnetic films.
Magnetic properties of a spin-3 Chromium condensate
Liang He,Su Yi
Physics , 2009, DOI: 10.1103/PhysRevA.80.033618
Abstract: We study the ground state properties of a spin-3 Cr condensate subject to an external magnetic field by numerically solving the Gross-Piteavskii equations. We show that the widely adopted single-mode approximation is invalid under a finite magnetic field. In particular, a phase separation like behavior may be induced by the magnetic field. We also point out the possible origin of the phase separation phenomenon.
Observing dipolar confinement-induced resonances in waveguides
Tao Shi,Su Yi
Physics , 2013, DOI: 10.1103/PhysRevA.90.042710
Abstract: We develop a theoretical framework for the quasi-low-dimensional confinement-induced resonances (CIRs) of particles with the arbitrary three-dimensional two-body interactions, based on the Huang-Yang pseudopotential and the treatment of Feshbach resonances. Using this new approach, we analytically obtain some universal properties of dipolar CIRs in quasi-one-dimensional (1D) waveguides. We also show that the dipolar CIRs can be induced by tuning the angle between the dipole moments and the waveguide, which is experimentally observable in quasi-1D Cr and Dy atomic gases. We expect that these tilting angle induced CIRs will open up a new simpler way to control the resonant scatterings in quasi-low-dimensional systems.
Combinatorics of symmetric plabic graphs
Rachel Karpman,Yi Su
Mathematics , 2015,
Abstract: A plabic graph is a planar bicolored graph embedded in a disk, which satisfies some combinatorial conditions. Postnikov's boundary measurement map takes the space of positive edge weights of a plabic graph $G$ to a positroid cell in $\text{Gr}_{\geq 0}(k,n)$. In this note, we investigate plabic graphs which are symmetric about a line of reflection, up to reversing the colors of vertices. These symmetric plabic graphs arise naturally in the study of total positivity for the Lagrangian Grassmannian. We characterize various combinatorial objects associated with symmetric plabic graphs, and describe the subset of $\text{Gr}_{\geq 0}(k,n)$ which can be realized by symmetric weightings of symmetric plabic graphs.
The Effects of Preoperative Imaging on Surgical Outcome for Pediatric Appendicitis Patients Special Issue: Pediatric Surgery  [PDF]
Henry Su, Laura Nally, Jennifer Maddison, Yi-Horng Lee
International Journal of Clinical Medicine (IJCM) , 2013, DOI: 10.4236/ijcm.2013.47A2007
Abstract: Computed tomography (CT) has been the major imaging modality for the diagnosis of appendicitis because of its excellent imaging resolution and the ease of interpretation, but a concern has been raised regarding radiation exposure. We have shifted from CT to ultrasonography (US) as the primary imaging modality because of this concern. A retrospective review is conducted to determine whether a combined US/CT strategy can reduce radiation exposure while maintaining the same surgical outcome. Five hundred eighty-six patients between 10 and 18 years of age who underwent an appendectomy from 2007-2011wereincluded in our study. The patients were classified as Early (prior to 7/1/2009) or Late (after 7/1/2009) with the knowledge that a conscientious institutional effort was made to start utilizing US as the primary imaging modality, limiting CT use to selective cases in 2009. The diagnostic imaging studies performed (CT, US or no imaging) were recorded. Operative findings, pathology reports and clinical course were reviewed. The rates of acute appendicitis (AA), negative appendectomies (NA) and perforated appendicitis (PA) were calculated. During the Early period, 49.3% of patients (n = 150) had undergone CT scans prior to their appendectomy whereas only 37.9% (n = 107) had CT scans during the Late period. Of the CT scans obtained during the Late period, only 18.4% of patients (n = 52) had a CT scan first, and 55 CT scans were done after an initial US. Patient disease patterns were similar between Early and Late years. While no difference in NA rates for boys was found between the Early and Late periods, a
A New Range-Based Regime-Switching Dynamic Conditional Correlation Model for Minimum-Variance Hedging  [PDF]
Yi-Kai Su, Chun-Chou Wu
Journal of Mathematical Finance (JMF) , 2014, DOI: 10.4236/jmf.2014.43018
Abstract:

This study proposes a new range-based Markov-switching dynamic conditional correlation (MSDCC) model for estimating the minimum-variance hedging ratio and comparing its hedging performance with that of alternative conventional hedging models, including the naive, OLS regression, return-based DCC, range-based DCC and return-based MS-DCC models. The empirical results show that the embedded Markov-switching adjustment in the range-based DCC model can clearly delineate uncertain exogenous shocks and make the estimated correlation process more in line with reality. Overall, in-sample and out-of sample tests indicate that the range-based MS-DCC model outperforms other static and dynamic hedging models.

Three-Dimensional Thermo-Elastic-Plastic Finite Element Method Modeling for Predicting Weld-Induced Residual Stresses and Distortions in Steel Stiffened-Plate Structures  [PDF]
Myung Su Yi, Chung Min Hyun, Jeom Kee Paik
World Journal of Engineering and Technology (WJET) , 2018, DOI: 10.4236/wjet.2018.61010
Abstract: The objective of the present paper is to develop nonlinear finite element method models for predicting the weld-induced initial deflection and residual stress of plating in steel stiffened-plate structures. For this purpose, three-dimensional thermo-elastic-plastic finite element method computations are performed with varying plate thickness and weld bead length (leg length) in welded plate panels, the latter being associated with weld heat input. The finite element models are verified by a comparison with experimental database which was obtained by the authors in separate studies with full scale measurements. It is concluded that the nonlinear finite element method models developed in the present paper are very accurate in terms of predicting the weld-induced initial imperfections of steel stiffened plate structures. Details of the numerical computations together with test database are documented.
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