58 research outputs found
Gossiping principles for the proactive distribution of Service and Qos related information in a decentralized service composition scenario
No full textBalsas Falaguera, JM. (2011). Gossiping principles for the proactive distribution of Service and Qos related information in a decentralized service composition scenario. https://riunet.upv.es/handle/10251/27155.Archivo delegad
Effects of cell size in the transition to double periodicity in Taylor-Couette flow
No full textThe transition from the singly periodic wavy vortex to doubly periodic modulated wavy vortex state of fixed outer cylinder Taylor-Couette flow has been experimentally investigated. We find that the supercritical flow following the third transition is not necessarily modulated wavy vortex flow, but can also be a wavy vortex flow state. The selection of the type of supercritical flow state is governed primarily by the cell aspect ratio and, to a lesser extent, can be influenced by 'small' aspect ratio fluid columns by way of the azimuthal wavespeed. Certain ranges of these parameters inhibit the transition to doubly periodic flow and result in a transition to a nonmodulating singly periodic flow state. The parameter ranges for this supercritical nonmodulating flow behavior have been studied and a clear accounting of these resulting flows is given. Additional findings indicate that the azimuthal wavespeed is affected by the presence of the superimposed wave train in doubly periodic flow. The cell size is also shown to have a significant influence on the value of the Reynolds number at which the flow becomes unstable and undergoes transition. Evidence also suggests that in a quasistatic ramping, modulated wavy vortex flow is the supercritical flow state following wavy vortex flow.Mechanical Engineering, Department o
Kooperative Internetdienste auf Basis von Peer-to-Peer Prinzipien
No full textThere are two main challenges for flexible service provisioning on top of
today's Internet. First the end-to-end networking paradigm which is
based on a service and data unaware transport, and secondly a lack of
high level communication abstractions.
With this thesis we approach both challenges. To address the first point
we propose a methodology to integrate the Network Provider into
the process of service provisioning. The introduced cooperative service
provisioning (CSP) enables an interaction between Service Provider,
Network Provider and Client. CSP can be applied in classical Provider
as well as novel Peer-to-Peer scenarios.
To address the second point, we adopt a Service Overlay
approach. A new method based on the extension of Distributed Hash Tables
(DHTs) is proposed to realise a distributed control plane for a
decentral and reactive creation of Service Overlays. To archive this,
a methodology to reduce Service Overlay related routing problems to
search problems was developed. With regard to the required Quality of Service (QoS) measurements, the thesis focuses on scalable and time efficient estimation techniques. As a result, two new delay prediction schemes
have been developed which improve estimation accuracy when compared
to the state of the art.
Furthermore, a novel approach to bandwidth estimation is investigated.
It combines methods from landmark based delay estimation with a
transformation step and has favourable estimation accuracy.
A CSP prototype has been realised based on the Peer-to-Peer middleware software OMNIX. For the implemented Content-Addressable Network (CAN) DHT a new algorithm to repair the CAN structure in case of multiple not gracefully leaving nodes has been integrated. The actual implementation is evaluated in the context of a media transcoding scenario using a Linux-based testbed.Zwei Kernprobleme bei Internet basierten Dienstleistungen sind ein von Daten und Dienstanforderungen unabhängiger Netzwerktransport sowie fehlende Kommunikationsabstraktionen.
Um einen daten- und dienstgerechten Transport zu ermöglichen, wird in dieser Arbeit ein Ansatz zur Integration von Netzwerk-Providern in den Dienstleistungsvorgang beschrieben. Das resultierende kooperative Dienstleistungsprinzip (CSP) ist anwendbar auf klassische Provider sowie neuartige Peer-to-Peer Dienstleistungsszenarien.
Zur Bereitstellung von Kommunikationsabstraktionen bei CSP wird in der Arbeit ein neuer Ansatz zur Verkettung von verteilten Dienstkomponenten vorgeschlagen. Grundlage bildet dabei eine verteilte Hash-Tabelle, die zu einer Plattform für den verteilten und reaktiven Aufbau von dienstspezifischen Overlay-Netzwerken erweitert wird. Als Voraussetzung für diesen Ansatz werden die im Overlay-Netzwerk-Fall auftretenden Routing-Probleme auf Such-Probleme reduziert.
Für die notwendige Erfassung von Netzwerkeigenschaften wie Verzögerung und Durchsatz werden Schätzverfahren untersucht. Als Ergebnis stellt die Arbeit zwei neue Verfahren zur Abschätzung von Netzwerkverzögerung, sowie ein neues Verfahren zur Abschätzung von Netzwerkdurchsatz vor. Eine prototypische Realisierung des beschriebenen CSP Systems wird in Zusammenhang mit einem Multimedia Transcoding Szenario evaluiert
‘Kunstbloem’ in finale Bio-Art & Design
No full textHoe ziet het landschap eruit als bijen op een kunstbloem met gekleurde pollen foerageren? Als een Van Gogh? Het idee levert onderzoeker David Kleijn een plek op in de finale van de Bio-Art & Design competitie. Synthetic Pollinizer heet het project dat Kleijn samen met de Australische kunstenaar Michael Candy uit wil voeren. En die ‘Kunstbloem’ komt er als het duo bij de eerste drie van de BAD-Award eindigt. Dan ligt er 25.000 euro te wachten om het bestuivingsproject daadwerkelijk uit te voeren
A Case for Lightweight SuperPeer Topologies
No full textElectrical Engineering, Mathematics and Computer Scienc
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No full textThis thesis document was issued under the authority of another institution, not NPS. At the time it was written, a copy was added to the NPS Library Collection for reasons not now known. It has been included in the digital archive for its historical value to NPS. Not believed to be a CIVINS (Civilian Institutions) title.Drawing from the findings of Peace Corps trainers, military advisors and those agencies sponsoring personnel attempting cross cultural interaction overseas and/or domestically, this study sought to isolate the personal interaction variables having the most influence upon successful communication. These variables, in order of importance, were found to be: self awareness, empathy, tolerance for ambiguity, self esteem, low dogmatism, high regard for the value of equality, the ability to communicate non-verbally, genuineness, warmth and openness.
Sampling from a population of Michigan State University, College of Education, students (n=288) interested in working in the inner city a ten-week training model was designed and tested for its effect upon 14 factors deemed to be important in interpersonal communication. The treatment consisted of an encounter group mode which included a series of human relations exercises. Instruments used to test the variables included: Rokeach's Value Inventory and D Scales, Hunt's Low Self Esteem Scale, the Truax Scales for Empathy, Genuineness, Warmth and Openness, Budner's Scale for Intolerance for Ambiguity, a congruity use of the Traux Scales for Self Awareness, and a non-verbal communication scale designed by the author.
Treatment versus control group analyses and repeated measures analyses showed significant treatment effects. Those variables most sensitive to treatment were (in order of strength) : increased self awareness, reduced dogmatism, higher regard for the value of equality, increased empathy, increased self esteem and increased tolerance for ambiguity. An analysis of relationship between leadership style and group mean behavioral changes (using Wile's Group Therapy Questionnaire—Form C) showed no significant correlations between leadership style and group performance within this
training model.http://archive.org/details/amodelforcrosscu109451581
Eccentric Workloads Generated by a Powered Rowing Machine and its Effects on Muscular Contraction and Metabolic Cost
No full textEvaluation of thermal monitoring systems
No full textThis thesis presents test results for several of the commercially available energy monitoring products, Btu-meters. These meters are the Rho Sigma RS 805, the ISTA WMZ 2/50, and the Wilgood Corp. HM1-RS.Mechanical Engineering, Department o
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