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Relationships between Quality of experience and TCP flag ratios for web servicesGholamzadeh Shirmohammadi, Bamshad January 2015 (has links)
Context: Nowadays one of the most beneficial business in IT area is web services with huge amount of users. The key ofsuccess in these type of services is flexibility in terms of providing same quality of services (QoS) and ability of fasttroubleshooting when number of users increase rapidly. To achieve these targets, evaluation of the user satisfaction is highlyessential. Moreover it is required to link user dissatisfaction to QoS parameters in terms of troubleshooting. Objectives: The main aim the research is to find an intelligent method for evaluation of the user satisfaction. The method isproposed to estimate quality-of-experience (QoE) without asking users to send their feed back. Connecting to this aim, thesecond target is finding the definition of function in equations of QoS=function(QoE). And finally, comparison of theimpact of QoS parameters on mobile application users and web site users is the last objective. Methods: For this research a web-server for video sharing propose is designed. The users can use it via web site or anAndroid mobile application. The three main QoS parameters (Packet-loss, delay and throughput) are changed gradually. Theusers are asked to score the mobile application and web site at the same time. In parallel the traffic of web-server is capturedand analyzed. Then based on variations in mean opinion scores (MOS) and also changes in TCP flags, the proper patternsfor each of the QoS parameters is provided. In this part the QoE is linked to transport layer. For the second objective, theQoE is directly linked to QoS. On the other words the graphs with QoE as horizontal axis and one of the QoS parameters asvertical axis are provided. And finally based on the gradient of these trends, the amount of impact of QoS parameters onmobile application users and web site users is compared. Results: Based on the results of the research, decrement in SYN and FIN flags and increment in ACK is an alarm for downgoing user satisfaction. In this situation, the problem is belongs to packet-loss. Increasing in the percentage of SYN is alsoa signal for user dissatisfaction. In this case, the problem is result of delay. And finally if the web-server problem is aboutthroughput then, SYN, FIN and ACK has up going trends. In all of the cases the rest of TCP flags has not clear up going ordecreasing trend.The correlation between QoS and QoE is formulated. The trends of MOS relative to QoS parameters for mobile phone andlaptop are very similar in case of packet-loss. For throughput the mobile phone users are a little more sensitive. The mostsignificant difference between the MOS values for mobile application and web site is belongs to delay. The increment indelay has really big negative effect on mobile application users. Conclusion: The final method for user satisfaction evaluation is based on the way of variations in the TCP flags. Among allthe flags, SYN, FIN and ACK passed the criteria to make the patterns. Moreover the method indicate the problem isbelongs to which of the QoS parameters. The correlation between QoE and QoS is formulated. And finally according tothese formulas, two separate web-servers for mobile application and web site is recommended.
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Propriétés de régularité homologique des variétés de drapeaux quantiques et d’algèbres associées. / Homological regularity properties of quantum flag varieties and related algebrasZadunaisky Bustillos, Pablo 25 March 2014 (has links)
Deux familles d'algèbres noethériennes connexes constituent les objets d'étude de cette thèse ; on les regarde, suivant les idées générales de la géométrie non commutative, comme des anneaux de coordonnées homogènes de certaines variétés projectives. La première famille est celle des variétés toriques quantiques, autrement dit les sous algèbres graduées de tores quantiques. Nous classifions ces algèbres et nous étudions ses propriétés de régularité homologique suivant notamment Artin-Schelter, Zhang et Van den Bergh. La deuxième famille est celle des variétés de drapeaux quantiques et leurs sous variétés de Schubert. Nous démontrons que les algèbres appartenant à cette deuxième famille possèdent une filtration tel que leur graduée associé est une variété torique quantique. Ensuite nous démontrons que les propriétés de régularité homologique des variétés de drapeaux quantiques et des variétés de Schubert se déduisent de celles des variétés toriques quantiques. / The objects of study of this thesis are two families of ”noncommutative varieties”, that is noetherian connected N-graded algebras which, following the general notions of noncommutative geometry, we regard as analogues of homogeneous coordinate rings of certain projective varieties. The first family is that of quantum toric varieties, which are graded subalgebras of quantum tori. We classify these algebras and study their homological regularity properties as defined by Artin-Schelter, Zhang, Van den Bergh, etc. The second family is that of quantum flag varieties and associated algebras, noncommutative analogues of the homogeneous coordinate rings of flag varieties and their Schubert subvarieties. We show that the members of this second family can be endowed with a filtration such that their associated graded algebras are quantum toric varieties. We then show that the homological regularity properties of quantum flag and Schubert varieties can be deduced from those of quantum toric varieties. / Los objetos de estudio de esta tesis pertenecen a dos familias de ”variedades no conmutativas”, es decir álgebras N-graduadas conexas noetherianas a las que consideramos, siguiendo la perspectiva de la geometría no conmutativa, como análogos de anillos de coordenadas homogéneas sobre ciertas variedades proyectivas. La primera familia es la de las variedades toricas cuánticas, subálgebras graduadas de toros cuánticos. Clasificamos estas álgebras y estimados en detalle sus propiedades de regularidad homológica, definidas por Artin-Schelter, Zhang, Van den Bergh, etc. La segunda familia es la de las álgebras conocidas como variedades de banderas cuánticas y otras álgebras asociadas, análogos no conmutativos de las álgebras de coordenadas homogeneas de las variedades de banderas y de sus subvariedades de Schubert. Demostramos que los miembros de esta segunda familia pueden filtrarse de forma que sus álgebras graduadas asociadas son variedades toricas cuánticas. Luego probamos que las propiedades de las regularidad homológica de las álgebras de las variedades de bandera y de Schubert cuánticas se deducen de la propriedades de las variedades toricas cuánticas.
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"Swear this flag to live, for this flag to die": Flag Imagery in Constructing the Narrative of the Civil War and the Transformation of American NationalismVanover, Eric Thomas 14 May 2010 (has links)
The Civil War transformed nationalism in American society and created a notion of national identity closely tied to flag iconography. Flag symbolism developed as the prominent visualization of nationalism in American culture during and after the Civil War. The flags of the Civil War - namely the American flag, the Confederate national flag, and the Confederate Battle Cross - grew into iconic images within American communities. Their status as symbols of nationalism, patriotism, and an American historical past often advocated by newspapers, individual citizens, and the soldiers of the war themselves, initiated an American tradition of flag iconography for the purpose of nationalism unforeseen in American culture before the war. After the war, the issues of reconciliation and of what context the war would be placed in American history also became influenced by flag imagery. With the potential for post-war bitterness and lengthened disunity, the American flag offered a symbol that allowed Americans to remember the war as the deeds of patriotic citizens and as part of a continuous American national narrative. In doing so, the American flag became the iconic symbol of American nationalism. / Master of Arts
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Characterization of the Signaling Properties of FLAG Tagged EP2 and EP4 Prostanoid ReceptorsDanielson, Kathryn, Ustic, Sean January 2009 (has links)
Class of 2009 Abstract / OBJECTIVES: To develop a novel characterization system utilizing immunofluorescent FLAG tagged EP2 and EP4 receptors to assist in the explanation of their unique cell signaling properties for exploitation in future drug development design.
METHODS: Plasmids were obtained and isolated that contained cDNAs encoding FLAG-tagged EP2 and EP4 receptors for transient expression in HEK-293 cells. The sequences of these plasmids were confirmed by restriction enzyme analysis and DNA sequencing. Transfected cells were treated with vehicle, PGE2 or forskolin to assess appropriate receptor functionality based on cAMP induction. RESULTS: The two PGE2 receptor subtypes, EP2 and EP4, are similar in their activation of adenylyl cyclase (AC) and subsequent up regulation of cAMP production. These receptors differ, however, in that EP2 more efficiently stimulates cAMP production and EP4 signaling involves the activation of phosphatidylinositol 3-kinase (PI3K) and extracellular signal related kinases (ERKs). The PGE2- treated cells responded as predicted with intracellular production of cAMP, with the EP2 receptor responding more efficiently than the EP4 receptor.
CONCLUSIONS: The intent is for these cells to be used as a novel assay system for the development of future selective EP2 and EP4 agonists. This research could potentially benefit in selectively targeting EP2 or EP4 pathways linked to prevalent ailments such as pain, fever, inflammation, possibly cancer or bone growth.
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Reconstructing certain quiver flag varieties from a tilting bundleGreen, James January 2018 (has links)
Given a quiver flag variety Y equipped with a tilting bundle E, a construction ofCraw, Ito and Karmazyn [CIK18] produces a closed immersion f_E : Y -> M(E), where M(E) is the fine moduli space of cyclic modules over the algebra End(E).In this thesis we present two classes of examples where f_E is an isomorphism. Firstly, when Y is toric and E is the tilting bundle from [Cra11]; this generalises the well-known fact that P^n can be recovered from the endomorphism algebra of \oplus_{0\leq i \leq n} O_{P^n}(i). Secondly, when Y = Gr(n, 2), the Grassmannian of 2-dimensional quotients of k^n and E is the tilting bundle from [Kap84]. In each case, we give a presentation of the tilting algebra A = End(E) by constructing a quiver Q' such that there is a surjective k-algebra homomorphism \Phi: kQ' -> A, and then give an explicit description of the kernel.
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Stable Basis and Quantum Cohomology of Cotangent Bundles of Flag VarietiesSu, Changjian January 2017 (has links)
The stable envelope for symplectic resolutions, constructed by Maulik and Okounkov, is a key ingredient in their work on quantum cohomology and quantum K-theory of Nakajima quiver varieties. In this thesis, we study the various aspects of the cohomological stable basis for the cotangent bundle of flag varieties. We compute its localizations, use it to calculate the quantum cohomology of the cotangent bundles, and relate it to the Chern--Schwartz--MacPherson class of Schubert cells in the flag variety.
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Diagonal Orbits in Double Flag VarietiesJanuary 2020 (has links)
archives@tulane.edu / Let G be a connected reductive complex algebraic group. We study the inclusion posets of diagonal G-orbit closures in a product of two partial flag varieties. In this dissertation, we show some results for G=SL_n and G=SO_{2n}. If the diagonal action is of complexity zero, then the poset is a graded lattice. If the diagonal action is of complexity one, then the poset is isomorphic to one of a finite number of posets that we determine explicitly. / 1 / Tien Minh Le
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New Insights into the Study of Flag CodesNavarro-Pérez, Miguel Ángel 14 January 2022 (has links)
En esta tesis profundizamos en el estudio de los códigos flag. Un flag es una sucesión de subespacios encajados de un espacio vectorial finitodimensional sobre un cuerpo también finito y un código flag es una colección no vacía de flags. Estos códigos fueron introducidos en 2018 por Liebhold et al. como una generalización de los códigos de subespacio, ampliamente estudiados en la última década. Cada código flag define de forma natural una familia de códigos de subespacio: sus códigos proyectados. A lo largo de esta tesis, investigamos la relación existente entre los códigos flag y sus respectivos códigos proyectados, a través de problemas de diferente naturaleza y utilizando herramientas provenientes de distintas áreas de las matemáticas. A continuación, exponemos brevemente el contenido de cada uno de los nueve capítulos que constituyen esta tesis. En primer lugar, abordamos el estudio de los códigos flag de distancia óptima. Estos códigos presentan gran interés puesto que detectan y corrigen el máximo número de errores y/o borrados posibles. En el Capítulo 1 caracterizamos estos códigos en términos de sus códigos proyectados. Además, bajo ciertas condiciones, concluimos que los códigos flag de distancia óptima alcanzan también el máximo cardinal posible cuando uno de sus códigos proyectados es un código spread. Los Capítulos 1 y 2 están dedicados al estudio y la construcción sistemática de esta familia especial de códigos flag (los de distancia óptima con un spread como proyectado) para cualquier elección de los parámetros. Por otra parte, en los Capítulos 3 y 6 utilizamos la acción transitiva del grupo general lineal sobre la variedad de flags y determinamos subgrupos adecuados para obtener construcciones, ahora orbitales, de códigos flag de distancia óptima con un spread entre sus proyectados. El Capítulo 4, por su parte, es un estudio general de propiedades de códigos flag orbitales bajo la acción natural del grupo multiplicativo de un cuerpo finito: los códigos flag cíclicos. Para ello, resulta crucial conocer el llamado mejor amigo del flag generador. En el mismo trabajo, estudiamos los “códigos flag de Galois”, en los que el flag generador está dado por una torre de subcuerpos encajados. En este caso, obtenemos construcciones orbitales cíclicas con spreads en todos los códigos proyectados. Además, probamos que las posibilidades para la distancia de un código flag de Galois son muy reducidas y determinamos qué subgrupos permiten alcanzar cada una de ellas. Este estudio continúa en el Capítulo 7, donde consideramos los llamados códigos flag de Galois generalizados: aquellos en los que el flag generador contiene cuerpos encajados, pero no todos sus subespacios son cuerpos. En este caso, mostramos que la presencia de cuerpos en el flag generador tampoco es compatible con todos los valores de la distancia de los códigos orbitales que este genera. Sin embargo, presentamos construcciones de estos códigos que nos permiten afirmar que, al contrario de lo que ocurre con los códigos de Galois, no todas las distancias compatibles con la estructura de cuerpos son realmente alcanzables. En el Capítulo 5 hacemos un estudio pormenorizado de los códigos flag consistentes: una familia de códigos flag cuyos parámetros quedan perfectamente determinados por los de sus códigos proyectados. Además, probamos que, bajo la condición de consistencia, ciertas propiedades estructurales de un código flag son equivalentes a las análogas para sus códigos proyectados y presentamos varias familias de ejemplos. Por último, la condición de consistencia también resulta ser de gran utilidad a la hora de decodificar códigos flag y proporcionamos un algoritmo de decodificación en el canal de borrado. Los Capítulos 8 y 9 están dedicados al estudio del parámetro distancia de los códigos flag. En el primero de ellos, introducimos el concepto de vector distancia y determinamos los valores de la distancia entre flags que pueden ser obtenidos a través de vectores distancia satisfaciendo determinadas condiciones. Este estudio se relaciona, a continuación, con el número de subespacios que dos flags distintos pueden compartir sin comprometer el valor de la distancia mínima de un código flag. Como consecuencia, obtenemos nuevas cotas para el cardinal de códigos flag para cualquier elección de los parámetros. Por último, en el Capítulo 9, interpretamos la distancia entre flags a través de estructuras combinatorias que construimos ad hoc para el estudio de nuestro problema. Más concretamente, asociamos un diagrama de Ferrers adecuado a la variedad de flags completos y, a través de él, identificamos condiciones sobre la distancia entre flags con ciertos elementos combinatorios provenientes de la Teoría de Particiones. Este nuevo diccionario nos permite obtener nuevos resultados que relacionan los parámetros de un código flag con los de sus proyectados, así como reinterpretar la caracterización de códigos flag de distancia óptima propuesta en el primer capítulo en términos de objetos combinatorios. / Generalitat Valenciana y Fondo Social Europeo (ACIF/2018/196)
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Nation as Decoration : The InVisibility of the US Flag in SwedenSundkvist, Moa January 2015 (has links)
This project explores banal nationalism from a perspective where the visibility and usage of the US flag as decoration on everyday products in Sweden is problematized. In comparison with the Swedish flag which has a history of being “unwaved” because open nationalism for a long time has been thought of as vulgar in Sweden, the frequent reproduction of the US flag seems to elude a critical discussion on national expressions. The effects of using a national symbol for commercial purposes is therefore theoretically and practically researched. / <p>The full thesis contains copyrighted material which has been removed in the published version. </p>
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A qualitative analysis of selection to flag rank in the United States NavySchwind, David A. 06 1900 (has links)
Approved for public release, distribution is unlimited / This thesis is a qualitative analysis of selection to Rear Admiral (Lower Half) in the United States Navy. Specifically, this thesis examines the variables in the career of senior US Navy officers that can be considered as factors in determining advancement at the O-7 selection board. The researcher conducted 18 semi-structured interviews with active duty and retired flag officers, using a protocol based on an analysis of archival data from flag officers promoted from year groups 1972 to 1978, and relevant literature to determine what factors are considered during the selection board process. Overall, the data indicate that select background and performance variables are important factors in the promotion of flag officers. Examples include the importance of reputation and fitness report rankings and the lack of weight given to factors such as commissioning source and letters of recommendation. / Lieutenant, United States Navy
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