6,771,319 research outputs found

    Issues in designing novel applications for multimedia technologies

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    Emerging computational multimedia tools and techniques promise powerful ways to organise, search and browse our ever-increasing multimedia contents by automating annotation and indexing, augmenting meta-data, understanding media contents, linking related pieces of information amongst them, and providing intriguing visualisation and exploration front-ends. Identifying real-world scenarios and designing interactive applications that leverage these developing multimedia technology is certainly an important research topic in itself but poses a number of challenges. In this talk, I will discuss and highlight some of these challenges in designing these novel applications by reflecting on my own design practice with a number of design examples

    Generalization of Friedberg-Lee Symmetry

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    We study the possible origin of Friedberg-Lee symmetry. First, we propose the generalized Friedberg-Lee symmetry in the potential by including the scalar fields in the field transformations, which can be broken down to the FL symmetry spontaneously. We show that the generalized Friedberg-Lee symmetry allows a typical form of Yukawa couplings, and the realistic neutrino masses and mixings can be generated via see-saw mechanism. If the right-handed neutrinos transform non-trivially under the generalized Friedberg-Lee symmetry, we can have the testable TeV scale see-saw mechanism. Second, we present two models with the SO(3)×U(1)SO(3)\times U(1) global flavour symmetry in the lepton sector. After the flavour symmetry breaking, we can obtain the charged lepton masses, and explain the neutrino masses and mixings via see-saw mechanism. Interestingly, the complete neutrino mass matrices are similar to those of the above models with generalized Friedberg-Lee symmetry. So the Friedberg-Lee symmetry is the residual symmetry in the neutrino mass matrix after the SO(3)×U(1)SO(3)\times U(1) flavour symmetry breaking.Comment: 16 pages, no figure, version published in PR

    The Sins of the Father: “Light Horse” Harry Lee and Robert E. Lee

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    In early 1862, Robert E. Lee was not yet in command of the Army of Northern Virginia. Instead, he was sent by Confederate President Jefferson Davis to inspect and improve the South’s coastal defenses. This job brought him to Cumberland Island, a barrier island off the coast of Georgia, and while there, he visited the ancestral home of Nathanael Greene, where his father was buried in the family plot. Greene was a famous and talented Revolutionary War general who led the Continental Army to success in taking back the Southern colonies. Lee’s father, “Light Horse” Harry Lee helped Greene take back the colonies, which is how they became friends. In a letter to his wife, Mary Anna Custis Lee, he discusses the visit and remarks how the grave is “marked by a plain marble slab.” At first glance, Lee seems to be a dutiful son visiting his father’s grave, but there is much more to the story. The story begins with Lee’s father, “Light Horse” Harry Lee, a Revolutionary War hero who seems to be just the type of person that Lee would look up to and aspire to be. [excerpt

    Trampling Mrs. Lee’s Roses: Union Soldiers at Arlington

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    “I would not stir from this house even if the whole Northern Army were to surround it,” wrote Mary Anna Randolph Custis Lee, wife of Robert E. Lee, to her daughter, Eleanor Agnes Lee on May 5, 1861. The Civil War was still in its infancy when Mary Lee wrote this letter, having begun a month earlier on April 12, 1861. Her husband had already sided with the Confederacy but there had not been much fighting yet. Even still, Mary Lee’s life was changing and would continue to change irrevocably throughout the war, especially in relation to Arlington House. Arlington House was the only home Mary Lee had ever known. It had been her childhood home, built by her father George Washington Parke Custis in 1802, and was the home where she raised her own children. Little did she know that by the end of the month, she would be gone from Arlington House. [excerpt

    A toy model based analysis on the effect of the Lee-Wick partners in the evolution of the early universe

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    In the present article the thermodynamic results of the Lee-Wick partner infested universe have been applied in a toy model where there is one Lee-Wick partner to each of the standard model particle and more over the longitudinal degrees of freedom of the massive partners of the standard massless gauge bosons are neglected at high temperatures. For practical purposes, the chiral fermionic sector of Lee-wick theories requires two Lee-Wick partners per fermion which opens up the possibility for a negative energy density of the early universe. A toy Lee-Wick model with one fermionic partner relaxes such oddities and hence easy to deal with. In a similar way, the longitudinal degrees of freedom of the massive gauge boson partners also have the potential to yield negative energy densities and thus those will be neglected in a toy model study. In such a toy model one can analytically calculate the time-temperature relation in the very early radiation dominated universe which shows interesting new physics. The article also tries to point out how a Lee-Wick particle dominated early cosmology transforms into the standard cosmological model. Based on the results of this toy model analysis a brief discussion on the more realistic model, which can accommodate two Lee-Wick partners for each standard fermionic field and the longitudinal degree of freedom of partners of the gauge fields, is presented. It has been shown that such an universe is mostly very difficult to attain but there are certain conditions where one can indeed think of such an universe which can evolve into the standard cosmological universe in a short time duration.Comment: v2: 23 pages, 2 figures, Title changed, Accepted for publication in PR
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