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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

On routing protocols for mobile social networks

Altamimi, Ahmed B. 18 October 2011 (has links)
A mobile social network (MSN) is defined as a mobile network that uses social relationships to allow its nodes to communicate. Many wireless networks including ad hoc networks do not reflect a real world deployment because of routing implementation difficulties. However, with the enormous use of social network sites (SNSs) including Twitter and Facebook, MSNs are expected to make the implementation of routing easier. Thus, some research activity has been devoted to routing protocols in such networks. This task is very challenging, thus only a few MSN routing protocols have been proposed in the literature. However, these protocols suffer from either a low delivery ratio or high memory requirements. This thesis presents a new routing protocol (Status) for MSNs which has excellent performance in terms of delivery ratio and memory requirements. Status takes advantage of the online status of a node to make forwarding decisions. Status has a low overhead ratio, low average delay and low computational complexity at the node level. All of these features are examined in this thesis. Simulation results are presented which show that Status outperforms other routing protocols such as Epidemic and PRoPHET with a realistic mobility model, namely, the shortest path movement based model (SPMBM). Status does not have high memory requirements since it does not store the online status of other nodes. Instead, an instance check is done when two nodes meet. Since messages are forwarded without probability calculations based on contact history, Status also has low computational complexity. / Graduate
2

High-speed optical packet switching over arbitrary physical topologies using the Manhattan Street Network

Komolafe, Olufemi O. January 2001 (has links)
No description available.
3

Samtalsanalys - en analys och jämförelse av skrivna och talade samtal

Karlsson, Jennie Unknown Date (has links)
<p>I uppsatsen analyseras och jämförs skrivna och talade samtal.</p><p>Mellan dessa två typer av samtal finns en rad skillnader såsom turtagning, uppbackningar och samtalsöppningar. Dessa regler är något som man inte tänker på i de talade samtalen, de sker som en reflex. I de skrivna samtalen är det mer fritt vad det gäller regler och på MSN är man inte lika bunden till samtalet som i det talade. </p><p> Uppsatsen visar att de talade samtalen är en bättre form av samtal då de är mer personliga och man kan läsa av varandra på ett enkelt sätt medan: MSN är opersonligt och man kan inte veta riktigt säkert på vilket humör samtalspartnern är utan att fråga.</p>
4

Samtalsanalys - en analys och jämförelse av skrivna och talade samtal

Karlsson, Jennie Unknown Date (has links)
I uppsatsen analyseras och jämförs skrivna och talade samtal. Mellan dessa två typer av samtal finns en rad skillnader såsom turtagning, uppbackningar och samtalsöppningar. Dessa regler är något som man inte tänker på i de talade samtalen, de sker som en reflex. I de skrivna samtalen är det mer fritt vad det gäller regler och på MSN är man inte lika bunden till samtalet som i det talade. Uppsatsen visar att de talade samtalen är en bättre form av samtal då de är mer personliga och man kan läsa av varandra på ett enkelt sätt medan: MSN är opersonligt och man kan inte veta riktigt säkert på vilket humör samtalspartnern är utan att fråga.
5

Identification of Phenolic Compounds from Peanut Skin using HPLC-MSn

Reed, Kyle Andrew 07 January 2010 (has links)
Consumers view natural antioxidants as a safe means to reduce spoilage in foods. In addition, these compounds have been reported to be responsible for human health benefits. Identification of these compounds in peanut skins may enhance consumer interest, improve sales, and increase the value of peanuts. This study evaluated analytical methods which have not been previously incorporated for the analysis of peanut skins. Toyopearl size-exclusion chromatography (SEC) was used for separating phenolic size-classes in raw methanolic extract from skins of Gregory peanuts. This allowed for an enhanced analysis of phenolic content and antioxidant activity based on compound classes, and provided a viable preparatory separation technique for further identification. Toyopearl SEC of raw methanolic peanut skin extract produced nine fractions based on molecular size. Analysis of total phenolics in these fractions indicated Gregory peanut skins contain high concentrations of phenolic compounds. Further studies revealed the fractions contained compounds which exhibited antioxidant activities that were significantly higher than that of butylated hydroxyanisole (BHA), a common synthetic antioxidant used in the food industry. This indicates peanut skin extracts are a viable antioxidant source, and that synthetic antioxidants can be replaced with those naturally-derived from peanut by-products. Structures contained in each fraction were identified using high performance liquid chromatography (HPLC) coupled with electrospray ionization (ESI) ion trap mass spectrometry (MSn). Prior to this study, approximately 20 compounds have been identified in peanut skins. The combination of Toyopearl SEC with ESI-HPLC-MSn allowed for the identification of 314 phenolic-based compounds, most of which are newly discovered compounds in peanut skins. Many compounds identified are known to have powerful antioxidant effects, and also have been reported to exhibit numerous beneficial chemical and biological activities, including the treatment of various human health-related conditions. It is evident that peanut skins may be a potential untapped source for the extraction of natural food antioxidants, nutracueticals, and even pharmaceuticals. Because peanut skins are largely a wasted resource to peanut processors, the novel polyphenols identified in this research could have a significant financial impact on the peanut industry. / Ph. D.
6

Caractérisation et localisation des xénobiotiques dans les cheveux par spectrométrie de masse Maldi / Characterization and localization of drugs in hair by MALDI mass spectrometry

Kernalléguen, Angéline 21 December 2018 (has links)
L’analyse des cheveux est à présent reconnue comme un outil pertinent dans le domaine de la toxicologie car elle permet de fournir un historique des habitudes de consommation d’un individu, qu’il s’agisse d’une consommation ponctuelle ou répétée.L’analyse d’un seul cheveu par désorption/ionisation laser assistée par matrice (MALDI) offre de nombreux avantages par rapport aux techniques conventionnelles : la quantité de cheveux est réduite, la préparation des échantillons est simplifiée et les images sont acquises avec une résolution spatiale très élevée (~100 µm). L’imagerie MALDI (MALDI-MSn) nous a permis de caractériser et de cartographier l’évolution des quantités de xénobiotiques le long du cheveu avec une très haute résolution spatiale sans une préparation trop longue ou trop complexe des échantillons au préalable.La spectrométrie de masse MALDI couplée à des plaques micro-réseaux (Microarrays for Mass Spetrometry, MAMS) nous a permis de développer une méthode pour effectuer une semi-quantification de la cocaïne, de la benzoylecgonine, de l’ecgonine méthyl ester et du cocaéthylène à partir d’une quantité de 1 mg de cheveux et 2 heures d’extraction ; les résultats sont bien corrélés avec une méthode de quantification validée. Cette méthode est pertinente lorsque des résultats urgents sont requis. Au total, le développement de ces deux applications nous a permis de démontrer la pertinence de la spectrométrie de masse MALDI dans l’analyse toxicologique du cheveu. Les perspectives consistent à améliorer ces protocoles afin de les transposer en routine et de développer des méthodes de screening large par spectrométrie de masse MALDI. / Hair analysis is now recognized as a relevant tool in the field of toxicology. It provides a precise history of an individual’s exposure to drugs, whether it is a punctual or repeated consumption.Matrix-Assisted Laser Desorption/Ionization (MALDI) has many advantages over conventional techniques: the amount of hair needed is reduced, the sample preparation is simplified and the images are acquired with high spatial resolution (~ 100 μm).MALDI (MALDI-MSn) imaging allowed us to characterize and map the evolution of drugs amounts along the hair with very spatial resolution avoiding long and complex pre-sample preparation.MALDI coupled to Microaarays for Mass Spectrometry (MAMS) allowed us to develop a method for semi-quantitation of cocaine, benzoylecgonine, ecgonine methyl ester and cocaethylene using 1 mg of hair and 2 hours of extraction; the results are well correlated with a validated quantification method. This method is relevant when urgent results are required.In total, the development of these two applications demonstrates the relevance of MALDI mass spectrometry in the toxicological analysis of hair. The prospects are to improve these protocols in order to transpose them routinely and to develop large screening methods by MALDI mass spectrometry.
7

網際網路溝通的語言遊戲—以MSN Messenger為例

潘美岑, Pan, Mei-Chen Unknown Date (has links)
本文以MSN Messenger為研究對象,從語言遊戲的角度出發,嘗試把網路語言放在一個新的理論位置。網路語言(Netspeak)在本文中的定義為:網路溝通多變的實際情境裡出現的語言,包括書寫、口語的語言,亦包括副語言(語言符號裡的輔助、身勢符號、非語言符號的面部表情和圖像)。 經由文獻探討,「網路溝通的語言遊戲」具備兩個概念:一是「語言遊戲」,一是「情境的言語遊戲」。前者的語言遊戲(Language Play)認為讓語言作平常不作的事就是玩語言遊戲,因此網路語言的特殊性可以歸納成口語強化遊戲和視覺符號遊戲,這個理論有助於我們檢視遊戲的根源轉化自語言的哪個部分。而後者「情境的言語遊戲」則融入了維根斯坦的概念,要我們回到語言的實際運用情境裡面,從實踐的角度來看前面的語言遊戲如何在情境中展現與變化。 本研究採取三種研究方法探索六個研究問題:調查法、內容分析法、對話分析法。內容分析法用來瞭解視覺符號遊戲與口語強化遊戲是什麼;調查法用來瞭解為何使用者玩語言遊戲、語言遊戲在不同情境中的變化;對話分析法則用以找出口語強化遊戲和視覺符號遊戲的對話功能,以及找出MSN溝通環境對傳播情境和溝通者而言,具有怎樣的限制和創造力之特性。 視覺符號遊戲最主要的轉化來源仍是面部表情,其中以MSN內建的表情符號比例最高,而誇張、戲謔版的下載符號則較線條組成的自製符號更受歡迎。口語強化遊戲最主要的轉化來源是語尾助詞,但口語遊戲的轉化來源通常不只一個,和日常生活的語言遊戲、通常一次只有一個變化的現象不一樣。此外,研究者亦發現,口語遊戲是MSN情境裡的核心現象;而視覺符號遊戲的「關係修辭性」比較強。網路情境還容許口語遊戲「視覺效果」的轉化,這樣的視覺效果也可能營造出聽覺效果。 使用者玩語言遊戲最主要的因素是獲致愉悅,其次是社交因素,即玩語言遊戲不但讓談話更為有趣,而且還讓自己和交談的對方變得比較親近。至於語言遊戲在不同情境中的變化,交談的目的僅是在維持某種社會關係時,使用者的溝通愉悅帶來了較多的語言遊戲;若是為了某種特定的任務溝通時,使用者的語言遊戲明顯較少。就熟稔程度來說,在低度熟稔程度的時候,有熟稔程度越高、玩越多視覺符號遊戲的趨勢,兩種遊戲皆是在「半生不熟」的狀況下玩得最多。 此外,不同的情境裡果然存在著不同的言語特色,運用視覺符號遊戲和口語強化遊戲的方式、提出話題的策略以及話題內容都有區別。由對話分析所觀察到MSN的對話限制及其延伸出的可能性有以下五點: 一、「答非所問」形成「話題跳動的彈性」 二、「對話次序」使得「資訊不受干擾」 三、「交談介面」有利於「製造當下的共通性」 四、「非面對面溝通」允許「釋放更多線索」 五、「網路溝通空間」是另一個「語言遊戲的寬廣空間」 建議未來研究可以繼續探討語言遊戲的語藝效果,不只是MSN情境,其他網路溝通情境裡的語言遊戲也有檢視的必要。並且也建議更深入地探討玩家的遊戲心理、遊戲在綜合情境中的面貌,以及混合遊戲產生的效果。
8

Ungdomars identitet genom chatspråk

Dahlgren, Oksana January 2009 (has links)
AbstraktDahlgren, O (2009). Ungdomars identitet genom chatspråk (The Identity of Youth throughthe Language of Chat) Malmö: Lärarutbildningen: Malmö högskolaExamensarbetet beskriver identitetssökandeprocessen bland ungdomar och på vilket sättchatspråk formar dagens ungdomars identitet. Syftet med examensarbetet är att beskrivaungdomsperioden och ge en syn på hur chatt formar den nutida ungdomens identitet.Dessutom syftar arbetet till att bidra till föräldrars och vuxnas medvetenhet om en sådanungdoms livssituation för att de skall kunna ha förståelse för ungdomarna, acceptera derasbeteende och språk och vara ett stöd. Arbetet har utgått ifrån följande frågor: Vad kan enidentitetssökandeprocess bland ungdomar innebära? På vilket sätt kan chatt och chatspråkforma ungdomars identitet? De metoder som använts för att få svar på frågeställningarna harvarit att intervjua ungdomar om chatt och chatspråk och att göra en undersökning av utdragenur chatt av de intervjuade ungdomarna. Den teoretiska bakgrunden bestod avjagidentitetsbegreppet samt den psykoanalytiska teorin och det socialpsykologiskaperspektivet och begreppen chatt och språk. Resultatet pekar på att chatt är en del av dennutida ungdomens vardag. Slutsatsen i examensarbetet är att chatt och chatspråk formardagens ungdomars identitet genom att ge dem tillhörighet till en grupp och är ett fält där dekan uttrycka sin personlighet.Nyckelord: Ungdomar, identitet, chatt, chatspråk, MSN, smiley, emoticon. / AbstractDahlgren, O (2009). Ungdomars identitet genom chatspråk (The Identity of Youth throughthe Language of Chat) Malmö: Lärarutbildningen: Malmö högskolaThis examination work describes the identity searching process among youths and in whatway chat language forms the identity of the today’s youths. The purpose of the examinationwork is to describe the youth period and give a view of in what way chat forms the today’syouths identity. Further more this work aims to contribute to parents´ and grown-ups´awareness about such a situation of life among youth, for them to be able to haveunderstanding for the youths, accept their behavior and language and to support them. Thework is based on the following questions: What may the identity searching process mean? Inwhat way may chat and chat language form the youth’s identity? The methods which wereused to get answers of the issues have been to interview the youths about chat, and chatlanguage, and to make a research of extracts from the personal chat examples of theinterviewed group. The theoretical background consisted of the I-identity definition, as wellas the psychoanalytical theory and the social psychological theory, and the definitions of chatand language. The result indicates towards that chat and chat language is a part of today’syouth’s everyday life. The conclusion of the examination work is the following: chat and chatlanguage form the today’s youth identity by means of giving them the feeling of belonging toa group and is a field for expression of their personality.Keywords: Youth, identity, chat, chat language, MSN, smiley, emotional icon.
9

MSN Orientation and Reference Course

Cameron, Nancy G. 01 September 2012 (has links)
No description available.
10

MSN Online Orientation and Reference Program

Cameron, Nancy G. 01 November 2011 (has links)
No description available.

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