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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.
31

Experimental Determination of the Stiffness and Strength of Continuity Tie Connections in Large Wood Roof Dipahragms, and Impact on the Collective Chord Model

Yarber, Caroline Nicole 01 August 2012 (has links)
The goal of this thesis is to determine whether continuity ties in large wood diaphragms are stiff enough to engage and provide diaphragm flexural stiffness in a collective chord model. Four series of continuity tie assemblies using Simpson Strong-Tie steel connectors were tested to determine the stiffness of each assembly. The results found from testing were applied to an example building and then analyzed using both the traditional chord method and the collective chord method. The completed analysis on a typical size warehouse building showed that the collective chord model will act inadvertently on an existing building designed with a traditional chord, or alternatively will potentially act intentionally in the design of a new building. The relative stiffness of the continuity ties will determine if they engage and allow them to act collectively. The testing and analysis completed creates a basis for further research into the actual static and dynamic behavior of these diaphragms. The collective chord model does seem to be a reasonable approximation for how diaphragms actually behave. If more research is conducted into different shaped and sized buildings to confirm that the collective chord model will work on most buildings then it will be a more accurate way to design new diaphragms and analyze existing diaphragms than the current traditional model.
32

在有基礎架構之車載網路中利用Chord機制改善P2P效能的研究 / Using chord structure to improve P2P performance over infrastructure-based vehicular network

許孜銚, Hsu, Tzu Yao Unknown Date (has links)
在vehicular network中應用Peer to peer (p2p)是目前尚在研究的一項領域。不同於一般wired network的環境,vehicular network環境中變動性相當高,且車輛移動速度快,車輛間無法長時間維持連線,所以若要在vehicular network上分享檔案資源,會遭遇到許多問題,像是如何在網路上有效率地搜尋所需要的檔案、相距甚遠的車輛如何分享彼此的資源、在有限的頻寬中如何發揮最大的分享效益,皆是十分重要的課題。本研究提出Urban Multi Layered Chord (UML-Chord)架構,在市區環境的vehicular network中,引入infrastructure-based的架構,以解決ad-hoc環境中只能靠車輛機會相遇時交換訊息,僅能做範圍內搜尋的缺點。另外我們使用multi-layered chord來管理網路上分享的檔案資源,此種結構化的p2p架構可以有比較好的搜尋效率。在檔案傳輸上,我們加入交通號誌的狀況後,讓車輛間連線預估時間(connection lifetime)更加精確,得以選出最適合的節點下載檔案,增加檔案的傳輸效率,提昇整體p2p應用的效能。 / Peer-to-peer (p2p) applications on vehicular network is a significant research topic today .Vehicular network is different from traditional wired network environment in some characteristics. Topology is very dynamic and vehicles driving in high speed, the connection between vehicles can’t maintain in a long time in vehicular network. If we want to share file resources on vehicular network, there are some problems to confronted, like the efficiency of query operations, sharing files with distance vehicles and fully utilizing the limited bandwidth. Our paper proposes an Urban Multi-layered Chord (UML-Chord) method in urban Vehicular network. Introducing infrastructure based architecture to deal with the problem that cars can exchange their files only when they meet each other in ad-hoc mode. In addition, we use multi layered chord to manage file resources which should be shared on Internet. This kind of structured p2p architecture has better efficiency in searching files. For file transfer part, we take stop light into account. We modify connection lifetime, let it be used in choosing appropriated download peers, enhancing the efficiency of p2p application.
33

P2P-based Mobility Management for Heterogeneous Wireless Networks and Mesh Networks

Nawrath, Thomas 14 July 2006 (has links) (PDF)
Today Moblity Management is one of the most important tasks that need to be accomplished to secure availability and performance of communication between people. This paper explains how moblity management is currently structured and what algorithms and approaches from Peer-To-Peer technology could be used to increase availability and performance.
34

Chord - A Distributed Hash Table

Liao, Yimei 24 July 2006 (has links) (PDF)
An introduction to Chord Algorithm.
35

Chord - A Distributed Hash Table

Liao, Yimei 21 August 2007 (has links) (PDF)
Source is converted into pdf format. An introduction to Chord Algorithm.
36

Πρόγραμμα αυτόματης εναρμόνισης μελωδίας

Σφυράκης, Χαράλαμπος 22 January 2009 (has links)
Στη παρούσα διπλωματική εργασία αναπτύσσεται ένα πρόγραμμα σε Java που εναρμονίζει μία μονοφωνική ή πολυφωνική μελωδία, η οποία θα εισάγεται στο σύστημα με τη μορφή MIDI αρχείων. Η βασική τεχνική που χρησιμοποιείται είναι τα κρυμμένα μοντέλα Markov. Εισάγονται διάφορες βελτιώσεις που ενσωματώνουν γνώσεις θεωρίας μουσική στα κρυμμένα μοντέλα Μαρκόφ. Τα πειραματικά αποτελέσματα έδειξαν ότι μπορούν να βελτιώσουν την συνολική απόδοση. / In this diploma dissertation an automatic melody harmonization program is developed, written in Java. It can harmonize either a monophonic or a polyphonic melody contained in a MIDI file using the power of hidden Markov Models. We introduce several methods which incorporate musical knowledge into hidden markov models. Experiment results show higher performance in chord recognition than the initial approach.
37

J.S. Bach's BWV 232: Augmented Sixth Chords in the Symbolum Nicenum as Structural and Theological Unifying Factors

Lusted, Luke Alan January 2015 (has links)
The focus of the present research is to examine Johann Sebastian Bach's (1685-1750) use of augmented sixth chords in the Symbolum Nicenum portion of his Mass in B Minor, BWV 232, as structural and theological unifying factors. Previous scholarly research has focused on other composers' settings of the Crucifixus text and detailed the conventions of chromatic harmony that many have incorporated in their works. Analysis of Bach's works dealing with Christ's crucifixion indicates that Bach was aware of both the augmented sixth chord and the conventions such a chord provided in service of Affekt. Further investigation of Bach's placement of these augmented sixth chords in the Symbolum Nicenum suggests that he intended to emphasize specific theological arguments presented in Martin Luther's (1483-1546) Ein Sermon von der Betrachtung des heiligen Leidens Christi ("A Sermon of Meditation on Christ's Holy Passion") written in 1519. In analyzing J.S. Bach's usage of augmented sixth chords in the Symbolum Nicenum, one recognizes his use of this sonority in service of Affekt for Christ's crucifixion related to Lutheran Passion theology.
38

Attacks on structured P2P overlay networks : Simulating Sybil Attacks

Tefera, Mismaku Hiruy January 2014 (has links)
No description available.
39

Investigation and modeling of the mechanisms involved in batch cooling crystallization and polymorphism through efficient use of the FBRM

Barthe, Stephanie Cecile 07 July 2008 (has links)
Batch crystallization is used widely in the production of high-value added species. It is widely recognized that product properties, some of which may be related directly to the utility of the drug, and downstream processes, such as tableting, are influenced by crystal morphology, size, and shape. The ability to observe on-line the evolution of the population density and detect a polymorphic transformation would constitute a major asset in understanding crystallizer operation and the phenomena that influence product quality. Focused-beam reflectance measurement (FBRM) is among the process analytical technologies (PAT) that hold promise for enhanced monitoring of pharmaceutical crystallization. It is based on scattering of laser light and provides a methodology for on-line monitoring of a representation of the crystal population in either batch or continuous crystallization systems. Properly installed, the FBRM allows on-line determination of the chord-length density, which is a complex function of crystal geometry and is statistically related to the population density. A model based on the geometry of the crystal was therefore established to relate both densities and thus enable computation of the population density from a measured chord length density. The evolution of the population density as a function of time leads to the estimation of the supersaturation and therefore allows the determination of the systems kinetics. From there, the population balance can be solved. Paracetamol is a common substance which exhibit polymorphism and is mainly used as an analgesic and antipyretic drug. The developed model was here applied to batch cooling crystallization of paracetamol from ethanol solutions; this system was used to explore the utility of FBRM data in detection of the polymorphic transformations. As different shapes generate different chord length densities, a transition from one polymorphic form with one specific crystal habit to another can be tracked through the FBRM. The purpose of the present study is to use the FBRM to monitor the evolution of the crystallization process, develop a model describing the evolution of the process, and monitor polymorphic transformation. The end results would be the possibility to implement a better control of the crystallization process that would ensure that downstream processing and product quality meet expectations.
40

Toward a scientific taxonomy of musical styles

Bellmann, Hector Guillermo January 2006 (has links)
The original aim of the research was to investigate the conceptual dimensions of style in tonal music in order to provide grounds for an objective, measurable categorization of the phenomenon that could be construed as the basis of a scientific taxonomy of musical styles. However, this is a formidable task that surpasses the practical possibilities of the project, which would hence concentrate on creating the tools that would be needed for the following stage. A review of previous attempts to deal with style in music provided a number of guidelines for the process of dealing with the material. The project intends to avoid the subjectivity of musical analysis concentrating on music observable features. A database of 250 keyboard scores in MusicXML format was built to the purpose of covering the whole span of styles in tonal music, from which it should be possible to extract features to be used in style categorization. Early on, it became apparent that most meaningful pitch-related features are linked to scale degrees, thus essentially depending on functional labeling, requiring the knowledge of the key of the music as a point function. Different proposed alternatives to determine the key were considered and a method decided upon. Software was written and its effectiveness tested. The method proved successful in determining the instant key with as much precision as feasible. On this basis, it became possible to functionally label scale degrees and chords. This software constitutes the basic tool for the extraction of pitch-related features. As its first use, the software was applied to the score database in order to quantify the usage of scale degrees and chords. The results indisputably showed that tonal music can be characterized by specific proportions in the use of the different scale degrees, whereas the use of chords shows a constant increase in chromaticism. Part of the material of this work appeared in the Springer-Verlag's 2006 volume of Lecture Notes in Computer Science.

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