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Search Results: 1 - 10 of 26574 matches for " Jae Lee "
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Surface Wave Echo in a Semi-Bounded Plasma  [PDF]
Hee J. Lee, Myoung-Jae Lee
Journal of Modern Physics (JMP) , 2016, DOI: 10.4236/jmp.2016.712127
Abstract: Plasma echo theory is revisited to apply it to a semi-bounded plasma. Spatial echoes associated with plasma surface wave propagating in a semi-bounded plasma are investigated by calculating the second order electric field produced by external charges and satisfying the boundary conditions at the interface. The boundary conditions are two-fold: the specular reflection condition and the electric boundary condition. The echo spots are determined in terms of the perpendicular coordinate to the interface and the parallel coordinate along which the wave propagates. This improves the earlier works in which only the perpendicular coordinate is determined. In contrast with the echo in an infinite medium, echoes in a bounded plasma can occur at various spots. The diversity of echo occurrence spots is due to the discontinuity of the electric field at the interface that satisfies the specular reflection boundary condition. Physically, the diversity appears to be owing to the reflections of the waves from the interface.
Development of Combined Trochoidal Profile of a Gerotor Pump  [PDF]
Hao Liu, Jae-Cheon Lee
Journal of Applied Mathematics and Physics (JAMP) , 2016, DOI: 10.4236/jamp.2016.41005
Abstract:

Gerotor pumps are a kind of internal gear pump, widely used in applications of lubricating system of on-road or off-road engines. Normally their outer rotors are the circular arc profile while their inner rotor profile is the conjugate curve of the outer rotor. This research focuses on how to derive the combined trochoidal profile of a gerotor pump. The hypocycloidal and epicycloidal profile of the inner rotor is generated at first. And then the profile of the outer rotor, based on the inner rotor profile, is obtained by analytical approach and computationally graphical approach. The paper provides feasibility to develop the unconventional profile of a gerotor pump.

No Null-Helix Mannheim Curves in the Minkowski Space
Jae Won Lee
International Journal of Mathematics and Mathematical Sciences , 2011, DOI: 10.1155/2011/580537
Abstract: We study a null Mannheim curve with time-like or space-like Mannheim partner curve in the Minkowski 3-space 31. We get the characterization of a null Mannheim curve. Then, we investigate there is no null-helix Mannheim curve in 31.
Constancy of -Holomorphic Sectional Curvature for an Indefinite Generalized -Space Form
Jae Won Lee
Advances in Mathematical Physics , 2011, DOI: 10.1155/2011/527434
Abstract: Bonome et al., 1997, provided an algebraic characterization for an indefinite Sasakian manifold to reduce to a space of constant -holomorphic sectional curvature. In this present paper, we generalize the same characterization for indefinite -space forms. 1. Introduction For an almost Hermitian manifold with , Tanno [1] has proved the following. Theorem 1.1. Let , and assume that almost Hermitian manifold satisfies for every tangent vector , , and . Then has a constant holomorphic sectional curvature at if and only if for every tangent vector at . Tanno [1] has also proved an analogous theorem for Sasakian manifolds as follows. Theorem 1.2. A Sasakian manifold ≥5 has a constant -sectional curvature if and only if for every tangent vector such that . Nagaich [2] has proved the generalized version of Theorem 1.1, for indefinite almost Hermitian manifolds as follows. Theorem 1.3. Let be an indefinite almost Hermitian manifold that satisfies (1.1), then has a constant holomorphic sectional curvature at if and only if for every tangent vector at . Bonome et al. [3] generalized Theorem 1.2 for an indefinite Sasakian manifold as follows. Theorem 1.4. Let be an indefinite Sasakian manifold. Then has a constant -sectional curvature if and only if for every vector field such that . In this paper, we generalize Theorem 1.4 for an indefinite generalized -space form by proving the following. Theorem 1.5. Let be an indefinite generalized -space form. Then is of constant -sectional curvature if and only if for every vector field such that , for any . 2. Preliminaries A manifold is called a globally framed f-manifold (or -manifold) if it is endowed with a nonnull -tensor field of constant rank, such that is parallelizable; that is, there exist global vector fields , , with their dual 1-forms , satisfying and . The -manifold , , is said to be an indefinite metric -manifold if is a semi-Riemannian metric with index satisfying the following compatibility condition: for any , being according to whether is spacelike or timelike. Then, for any , one has . Following the notations in [4, 5], we adopt the curvature tensor , and thus we have and , for any , , , . We recall that, as proved in [6], the Levi-Civita connection of an indefinite -manifold satisfies the following formula: where is given by . An indefinite metric -manifold is called an indefinite -manifold if it is normal and , for any , where for any . The normality condition is expressed by the vanishing of the tensor field , being the Nijenhuis torsion of . Furthermore, the Levi-Civita connection of an indefinite
Characteristic Lightlike Submanifolds of an Indefinite -Manifold
Jae Won Lee
International Journal of Mathematics and Mathematical Sciences , 2011, DOI: 10.1155/2011/140259
Abstract: We study characteristic -lightlike submanifolds tangent to the characteristic vector fields in an indefinite metric -manifold, and we also discuss the existence of characteristic lightlike submanifolds of an indefinite -space form under suitable hypotheses: (1) is totally umbilical or (2) its screen distribution () is totally umbilical in .
β2 adrenergic agonists in acute lung injury? The heart of the matter
Jae W Lee
Critical Care , 2009, DOI: 10.1186/cc8171
Abstract: In their manuscript, Briot and colleagues [1] assessed the role of terbutaline, a β2 agonist, on lung microvascular permeability in an acute lung injury (ALI) in vivo model to uncover the underlying mechanisms of therapeutic benefit. The authors used a recently developed broncho-alveolar lavage technique [2] to repeatedly measure (every 15 minutes) the time-course of capillary-alveolar leakage of a macromolecule, fluorescein-labeled dextran (FITC-D70), in 19 oleic acid (OA) lung injured dogs. With OA injury, the transport rate of coefficient of FITC-D70, used as a measure of permeability, from blood to alveoli increased sharply and peaked at 30 minutes. Thereafter, FITC-D70 leakage decreased gradually until the end of the experiment at 4 hours. Surprisingly, the infusion of terbutaline, given following 90 minutes of OA injury, interrupted the recovery phase, further aggravating FITC-D70 leakage. The authors discovered that with the onset of terbutaline infusion at 0.25 μg/kg/minute, the β2 inotropic effect of the drug significantly [3] increased the cardiac output and pulmonary artery pressure by 50% and 30%, respectively, while decreasing the pulmonary vascular resistance by 40%. With increased pulmonary vascular recruitment, the authors surmised that the terbutaline infusion increased perfusion surface area or recruited leaking capillaries from hypoxic vasoconstriction, which led to an aggravation of FITC-D70 leakage into the alveoli.Previously, β2 agonist therapy was considered promising for ALI based on several characteristics seen in both animal and human models: the ability to increase the rate of vectorial salt and water transport by increased intracellular cAMP, leading to improved alveolar fluid clearance (AFC) [4,5] - clinically, impaired AFC in patients with ALI is associated with higher mortality [6]; the ability to improve lung endothelial permeability to protein [7]; and the anti-inflammatory properties of β2 agonists. Maris and colleagues [8] demonstr
LHC Signatures of MSSM Higgs-sector CP Violation
Lee, Jae Sik
High Energy Physics - Phenomenology , 2007,
Abstract: We discuss a few new characteristic features of the loop-induced MSSM Higgs-sector CP violation at the LHC based on two scenarios: (i) CPX and (ii) Trimixing.
Gaugino masses from gravitino at one loop
Lee, Jae Yong
High Energy Physics - Phenomenology , 2013,
Abstract: The N=1 supergravity coupled to chiral and Yang-Mills superfields is regarded as the ultraviolet theory of the supersymmetric Standard Model. The gravitino acquires a mass from the hidden sector and participate in mediating supersymmetry breaking to the visible sector. We consider the quantum effects of the gravitino and evaluate its contribution to the gaugino masses at one loop level, which turns out to be irrespective of the SM gauge couplings. Due to the universality of gravitino, its contribution to the gaugino masses can significantly modify the gaugino mass relations of other supersymmetry breaking mechanisms depending on the gravitino mass. For a given gaugino mass the gravitino mass cannot be arbitrarily large even when other supersymmetry breaking mechanisms are dominant.
Manifestations of CP Violation in the MSSM Higgs Sector
Lee, Jae Sik
High Energy Physics - Phenomenology , 2008, DOI: 10.1063/1.3051964
Abstract: We demonstrate how CP violation manifests itself in the Higgs sector of the minimal supersymmetric extension of the Standard Model (MSSM). Starting with a brief introduction to CP violation in the MSSM and its effects on the Higgs sector, we discuss some phenomenological aspects of the Higgs sector CP violation based on the two scenarios called CPX and Trimixing
Probing Higgs-sector CP Violation at a Photon Collider
Lee, Jae Sik
High Energy Physics - Phenomenology , 2007, DOI: 10.1142/S0217732307023717
Abstract: In this review we demonstrate physics potential of a photon linear collider by studying the neutral Higgs-boson sector of the MSSM in which interesting CP-violating Higgs mixing could arise via radiative corrections.
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