Dissertations / Theses on the topic 'Cloud communication'
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Espínola, Brítez Laura María. "Efficient communication management in cloud environments." Doctoral thesis, Universitat Autònoma de Barcelona, 2018. http://hdl.handle.net/10803/666690.
Full textScientific applications with High Performance Computing (HPC) requirements are migrating to cloud environments due to the facilities that it offers. Cloud computing plays a major role considering the compute power that it provides, avoiding the cost of physical cluster maintenance. With features like elasticity and pay-per-use, it helps to reduce the researchers procurement risk. Most of HPC applications are implemented using Message Passing Interface (MPI), which is a key component in common and distributed computing tasks. However, for this kind of applications on cloud environments, the major drawback is the lost of execution performance, due to the virtualized network that affects the communications latency and bandwidth. To use a cloud environment with scientific applications of this kind, low latency communication mechanisms are required. The network topology detail is not available for users in virtualized environments, making difficult to use the existing optimizations based on network topology information done in bare-metal cluster environments. In some cases, cloud providers can migrate virtual machines, which impacts the efficiency of routing optimizations and placement algorithms. Moreover, if resource isolation is not guaranteed, resource sharing can lead to variable bandwidth and unstable performance. In this thesis a Dynamic MPI Communication Balance and Management (DMCBM) is presented, to overcome the communication challenge of HPC applications in cloud. DMCBM is implemented as a middle-ware between the users application and the execution environment. It improves message communication latency times in cloudbased systems, and helps users to detect mapping and parallel implementation issues. Our solution dynamically rebalances communication flows at higher levels of the virtualized HPC stack, e.g. over MPI communications layer, to dynamically remove communication hot-spots and congestion in the underlying layers. DMCBM abstracts the communications state between application processes based on latency measurements. This middleware characterizes the underlying network topology and analyzes parallel applications behavior in the cloud. This allows for detecting network congestion and optimizing communications by either selecting alternative communication paths between processes, or leveraging live migration of virtual machines in cloud environments. These options are analyzed in real-time and selected according to the type of congestion (link or destination). DMCBM achieves lower application execution time in case of congestion, obtaining better performance in clouds. Finally, experiments that verify the functionality and improvements of DMCBM with MPI Applications in public and private clouds are presented. The experiments where done by measuring execution and communication times. NAS Parallel Benchmarks and a real application of dynamic particles simulation NBody are used, obtaining an improvement of up to 10% in the execution time and a communication time reduction of about 40% in congestion scenarios.
Ward, Daniel R. "Reaper – Toward Automating Mobile Cloud Communication." ScholarWorks@UNO, 2013. http://scholarworks.uno.edu/td/1707.
Full textMullins, Taariq. "Participatory Cloud Computing: The Community Cloud Management Protocol." Thesis, University of Cape Town, 2014. http://pubs.cs.uct.ac.za/archive/00000999/.
Full textSundaram, Madhu, and Kejvan Redjamand. "Strategy of Mobile Communication System Providers in Cloud (Implementation of cloud in telecom by Ericsson)." Thesis, Blekinge Tekniska Högskola, Sektionen för management, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-2814.
Full textŁaskawiec, Sebastian. "Effective solutions for high performance communication in the cloud." Rozprawa doktorska, Uniwersytet Technologiczno-Przyrodniczy w Bydgoszczy, 2020. http://dlibra.utp.edu.pl/Content/2268.
Full textSgarbi, Andrea. "Machine Cloud Connectivity: a robust communication architecture for Industrial IoT." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.
Find full textSajjad, Ali. "A secure and scalable communication framework for inter-cloud services." Thesis, City University London, 2015. http://openaccess.city.ac.uk/14415/.
Full textPourghomi, Pardis. "Managing near field communication (NFC) payment applications through cloud computing." Thesis, Brunel University, 2014. http://bura.brunel.ac.uk/handle/2438/8538.
Full textSathyamoorthy, Peramanathan. "Enabling Energy-Efficient Data Communication with Participatory Sensing and Mobile Cloud : Cloud-assisted crowd-sourced data-driven optimization." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-274875.
Full textEldh, Erik. "Cloud connectivity for embedded systems." Thesis, KTH, Kommunikationssystem, CoS, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-118746.
Full textAtt använda ett inbyggt system som en kontrollenhet för elektronik är inget nytt. Dessa typer av system finns idag överallt och används i vidt spridda användningsområden medans datormolnet är en ny approach för dator användning i sin helhet. Utforska och skapa en länk mellan dessa två mycket olika platformar för att facilitera nya tillvägagångs sätt att sköta underhåll sparar företag inte tid och pengar när det kommer till inbyggda system utan också när det gäller driften för servrar. Denna examensarbete utforskar denna typ av länk och presenterar för endamålet lämpliga tekniker att koppla dem samman medans lämpligheten för en sådan lösning diskuteras. Att utforska det som inkluderas i konceptet molnet genom att undersöka tillgängliga teknologier för utveckling är viktigt för att få en bild av vad marknaden har att erbjuda. Mer viktigt är hur utveckling går till och vilka fördelarna är. Hur teknologoier som databaser, last distrubutörer och server miljöer har adapterats till molnmiljön och vilka nackdelar och fördelar som kommit ut av detta är av intresse och vidare hur en lösning kan använda sig av dessa fördelar i ett verkliget scenario. Tre olika moln leverantörer och deras produkter har presenterats för att ge en bild av vad som för tillfället erbjuds. För att realisera en lösning har ett sett att kommunicera och utbyta data presenterats och diskuterats. Åter igen för att realisera konceptet i ett verkligt scenario. Denna uppsats presenterar konceptet moln anslutbarhet för inbyggda system för att kunna få en lösning realiserad och använd. En mellanprograms lösning som drar styrka ifrån de tjänster som erbjudas av molnleverantörer för driftsättning hos en leverantor föreslås. Denna mellanprogramslösnings agerar tillståndslöst för att erbjuda kommunikation och funktions sammankoppling mellan de två olika deltagarna som har olika förutsätningar. Denna approach skapar en flexibel gemensam plattform för olika klienter hos slutanvändaren och minskar bördan hos de inbyggdasystemet att behöva göra analyser och distrubuera informationen till klienterna. Denna lösning erbjuder också en abstraktion av de inbyggdasystemen för att erbjuda ytterligare säkerhet när kommunikation sker med de inbyggdasystemet genom att den endast sker med giltiga mellanprogram.
Alawadi, Tareq A. "Investigation of the effects of cloud attenuation on satellite communication systems." Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/7991.
Full textTeyeb, Hana. "Optimisation intégrée dans un environnement cloud." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLL010/document.
Full textIn geo-distributed cloud systems, a key challenge faced by cloud providers is to optimally tune and configure their underlying cloud infrastructure. An important problem in this context, deals with finding an optimal virtual machine (VM) placement, minimizing costs while at the same time ensuring good system performance. Moreover, due to the fluctuations of demand and traffic patterns, it is crucial to dynamically adjust the VM placement scheme over time. Hence, VM migration is used as a tool to cope with this problem. However, despite the benefits brought by VM migration, in geo-distributed cloud context, it generates additional traffic in the backbone links which may affect the application performance in both source and destination DCs. Hence, migration decisions need to be effective and based on accurate parameters. In this work, we study optimization problems related to the placement, migration and scheduling of VMs hosting highly correlated and distributed applications within geo-distributed DCs. In this context, we propose an autonomic DC management tool based on both online and offline optimization models to manage the distributed cloud infrastructure. Our objective is to minimize the overall expected traffic volume circulating between the different DCs of the system. To deal with different types of communication traffic patterns, we propose both deterministic and stochastic optimization models to solve VM placement and migration problem and to cope with the uncertainty of inter-VM traffic. Furthermore, we propose near-optimal algorithms that provide with the best inter-DCs migration sequence of inter-communicating VMs. Along with that, we study the impact of the VM's lifetime on the migration decisions in order to maintain the stability of the cloud system. Finally, to evaluate and validate our approach, we use experimental tests as well as simulation environments. The results of the conducted experiments show the effectiveness of our proposals
Sant\'Ana, Fábio Sousa de. "Avaliação de desempenho de mecanismos de segurança em ambientes PACS (Picture Archiving and Communication System) baseados em computação em nuvem." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/17/17157/tde-29032017-162812/.
Full textIntroduction: the adoption of a PCAS (Picture Archiving and Communication System) is fundamental for the structuring of a radiological environment without film. A PACS comprises, essentially, hardware and information systems interconnected in a network, oriented towards acquisition, storage (or archiving), retrieving and presentation of medical images to specialists entrusted with analyzing and assessing them. Cloud computing comes to support of PCAS, simplifying medical imaging sharing between health care organizations and promoting the virtualization of physical infrastructure to assure uninterrupted availability of the PCAS. Goal: This study aimed to implement a simplified PCAS in a private cloud computing environment, and subsequently to evaluate its security and performance. Methodology: The images that formed the new PCAS were obtained from the exiting PCAS of Centro de Ciência das Imagens e Física Médica of Hospital das Clinicas da Faculdade de Medicina de Ribeirão Preto - CCIFM/HCFMRP. To evaluate its security, scenarios were built within the following framework: 1) patient identification data anonymization through computational database cryptography, using the AES (Advanced Encription Standards) algorithm ; 2) transfer of encrypted medical images on the Internet using VPN (Virtual Private Network) over IPSec (Internet Protocol Security); and 3) safe traffic through Secure Shell (SSH) tunneling. Results: There was a performance drop on traffic of information to the cloud under the proposed security levels that suggests a relationship between increase in security and loss of performance, pointing to the need for performance studies when the project involving driving adoption in clinical environments PACS solution based on cloud computing.
Liu, Yu. "A Data-centric Internet of Things Framework Based on Public Cloud." Licentiate thesis, Linköpings universitet, Fysik, elektroteknik och matematik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-159770.
Full textMoiz, A. (Abdul). "Design, implementation and testing of a mobile cloud." Master's thesis, University of Oulu, 2015. http://urn.fi/URN:NBN:fi:oulu-201512082287.
Full textPersson, Mathias. "Communication Protocol for a Cyber-Physical System : Using Bluetooth, NFC and cloud." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-175159.
Full textDenna uppsats fokuserar på att använda många av dagens teknologier för att konstruera ett kommunikationsprotokoll som möjliggör för olika enheter att inkorporeras i ett system som underlättar informationsflödet mellan en användare och en värld av digital data. Protokollet utnyttjar olika individuella fördelar hos NFC, Bluetooth and molntjänster i dess design för att göra den underliggande komplexiteten så transparant som möjligt för användaren. Några av de främsta problemen, så som säkerhet och tillförlitlighet, diskuteras och hur de inkorporeras i hjärtat av protokollet. Protokollet appliceras sedan i en fallstudie för att se hur det kan användas för att skapa ett system för sjukjournaler som bevarar integriteten hos patienter. Resultatet från fallstudien pekar mot att de riktlinjer som gavs av protokollspecifikationerna fungerar för att göra en systemimplementation på en teoretisk nivå. En verklig systemimplementation skulle behövas för att verifiera de resultat som framgår ur fallstudien.
Chilwan, Ameen. "Dependability Differentiation in Cloud Services." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for telematikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13120.
Full textMoyer, Daniel William. "Punching Holes in the Cloud: Direct Communication between Serverless Functions Using NAT Traversal." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/103627.
Full textMaster of Science
Serverless computing is a branch of cloud computing where users can remotely run small programs, called "functions," and pay only based on how long they run. A growing use for serverless computing is running large data processing applications that use many of these serverless functions at once, taking advantage of the fact that serverless programs can be started quickly and on-demand. Because serverless functions run on isolated networks from each other and can only make outbound connections to the public internet, a major challenge with this paradigm is transferring temporary computation data between functions. Previous works have used separate types of cloud storage services in combination with serverless computing to allow functions to exchange data. However, hard-drive--based storage is slow and memory-based storage is expensive. We evaluate the use of direct network connections between functions to overcome these limitations. Although functions cannot receive incoming network connections, we are able to bypass this restriction by using a standard networking technique called Network Address Translation (NAT) traversal. We use an external server as an initial relay to setup a network connection between two functions such that once the connection is established, the functions can communicate directly with each other without using the server anymore. In addition, we develop a communications framework to manage NAT traversal and data flow for applications using direct network connections. We evaluate this framework with an application for combining matching data entries and compare it to an equivalent version that uses storage based on hard drives for communication. For a job with over 100 functions, our implementation using direct network connections runs 4.7 times faster at almost half the cost.
Wicaksana, Arief. "Infrastructure portable pour un système hétérogène reconfigurable dans un environnement de cloud-FPGA." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT088/document.
Full textField-Programmable Gate Arrays (FPGAs) have been gaining popularity as hardware accelerators in heterogeneous architectures thanks to their high performance and low energy consumption. This argument has been supported by the recent integration of FPGA devices in cloud services and data centers. The potential offered by the reconfigurable architectures can still be optimized by treating FPGAs as virtualizable resources and offering them multitasking capability. The solution to preempt a hardware task on an FPGA with the objective of context switching it has been in research for many years. The previous works mainly proposed the strategy to extract the context of a running task from the FPGA to provide the possibility of its resumption at a later time. The communication during the process, on the contrary, has not been receiving much attention.In this work, we study the communication management of a hardware task whileit is being context switched. This communication management is necessary to ensure the consistency in the communication of a task with context switch capability in a reconfigurable system. Otherwise, a hardware context switch can only be allowed under restrictive constraints which may lead to a considerable penalty in performance; context switching a task is possible after the communication flows finish and the input/output data have been consumed. Furthermore, certain techniques demand homogeneity in the platform for a hardware context switch can take place.We present a mechanism which preserves the communication consistency during ahardware context switch in a reconfigurable architecture. The input/output communication data are managed together with the task context to ensure their integrity. The overall management of the hardware task context and communication data follows a dedicated protocol developed for heterogeneous reconfigurable architectures. This protocol thus allows a hardware context switch to take place while the task still has ongoing communication flows on Reconfigurable System-on-Chips (RSoCs). From the experiments, we discover that the overhead due to managing the communication data becomes negligible since our mechanism provides the necessary high responsiveness for preemptive scheduling, besides the consistency in communication. Finally, the applications of the proposed solution are presented in a task migration prototyping and in a hypervisor-based system
Ramagoffu, Madisa Modisaotsile. "The impact of network related factors on Internet based technology in South Africa : a cloud computing perspective." Diss., University of Pretoria, 2012. http://hdl.handle.net/2263/22820.
Full textDissertation (MBA)--University of Pretoria, 2012.
Gordon Institute of Business Science (GIBS)
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Oueis, Jessica. "Gestion conjointe de ressources de communication et de calcul pour les réseaux sans fils à base de cloud." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAM007/document.
Full textMobile Edge Cloud brings the cloud closer to mobile users by moving the cloud computational efforts from the internet to the mobile edge. We adopt a local mobile edge cloud computing architecture, where small cells are empowered with computational and storage capacities. Mobile users’ offloaded computational tasks are executed at the cloud-enabled small cells. We propose the concept of small cells clustering for mobile edge computing, where small cells cooperate in order to execute offloaded computational tasks. A first contribution of this thesis is the design of a multi-parameter computation offloading decision algorithm, SM-POD. The proposed algorithm consists of a series of low complexity successive and nested classifications of computational tasks at the mobile side, leading to local computation, or offloading to the cloud. To reach the offloading decision, SM-POD jointly considers computational tasks, handsets, and communication channel parameters. In the second part of this thesis, we tackle the problem of small cell clusters set up for mobile edge cloud computing for both single-user and multi-user cases. The clustering problem is formulated as an optimization that jointly optimizes the computational and communication resource allocation, and the computational load distribution on the small cells participating in the computation cluster. We propose a cluster sparsification strategy, where we trade cluster latency for higher system energy efficiency. In the multi-user case, the optimization problem is not convex. In order to compute a clustering solution, we propose a convex reformulation of the problem, and we prove that both problems are equivalent. With the goal of finding a lower complexity clustering solution, we propose two heuristic small cells clustering algorithms. The first algorithm is based on resource allocation on the serving small cells where tasks are received, as a first step. Then, in a second step, unserved tasks are sent to a small cell managing unit (SCM) that sets up computational clusters for the execution of these tasks. The main idea of this algorithm is task scheduling at both serving small cells, and SCM sides for higher resource allocation efficiency. The second proposed heuristic is an iterative approach in which serving small cells compute their desired clusters, without considering the presence of other users, and send their cluster parameters to the SCM. SCM then checks for excess of resource allocation at any of the network small cells. SCM reports any load excess to serving small cells that re-distribute this load on less loaded small cells. In the final part of this thesis, we propose the concept of computation caching for edge cloud computing. With the aim of reducing the edge cloud computing latency and energy consumption, we propose caching popular computational tasks for preventing their re-execution. Our contribution here is two-fold: first, we propose a caching algorithm that is based on requests popularity, computation size, required computational capacity, and small cells connectivity. This algorithm identifies requests that, if cached and downloaded instead of being re-computed, will increase the computation caching energy and latency savings. Second, we propose a method for setting up a search small cells cluster for finding a cached copy of the requests computation. The clustering policy exploits the relationship between tasks popularity and their probability of being cached, in order to identify possible locations of the cached copy. The proposed method reduces the search cluster size while guaranteeing a minimum cache hit probability
Goméz, Villanueva Daniel. "Secure E-mail System for Cloud Portals : Master Thesis in Information and Communication Systems Security." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-108080.
Full textCuttitta, Anthony R. "Talking about technology| A metaphoric analysis of cloud computing and web 2.0." Thesis, Northern Arizona University, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1550099.
Full textThis research investigates the discourse around the terms web 2.0 and cloud computing, which are used as metaphors for information technology. In addition to the disruptive technologies and applications to which they refer, both of these terms have affected information technology, its use, and the way it is perceived. This research examines how this impact has varied over time and by audience. The usage of the terms is examined through a rhetorical analysis of a sampling of articles from the general publications The New York Times, The Washington Post, and USA Today, and the professional publications InformationWeek and CIO Magazine. The research is an analysis of these artifacts using critical methods influenced by metaphoric analysis, symbolic interactionism, and Burke's concept of symbolic action. Metaphors serve as cognitive tools in discourse communities for understanding new domains, the tenor or target of the metaphor, through references to shared symbols, the vehicle or source of the metaphor. Metaphors may be mostly descriptive, as epiphors, or persuasive, as diaphors. This research shows that the web 2.0 and cloud computing metaphors served a persuasive purpose for helping people understand disruptive technology through familiar experiences. Rhetors used the metaphors in persuading audiences whether or not to adopt the new technologies. As the new technologies became accepted and adopted, problems arose which were obscured in the original metaphor, so new metaphors emerged to highlight and conceal various aspects of the technologies. Some of these new metaphors arose with systematicity in the same domain of the original metaphor, while others came from different domains. The ability of the metaphor to be used in various rhetorical situations as the technology evolves affects the usefulness of the metaphor over time. The usage of web 2.0 shortly after the dot com boom and bust cycle of the late 1990s and early 2000s allowed rhetors to frame web 2.0 as an economic phenomenon, casting the collaborative aspects of the technology as tools for making money in a perceived second dot com bubble. The failure of the second dot com bubble to materialize, along with user frustration with the emphasis of the economic aspects of collaboration and the limited usefulness of the software release cycle in representing continuous technical change, led to infrequency of the use of web 2.0 as a metaphor. Other metaphors, like social networking and social media, arose as a new source domain to represent some of the collaborative aspects of the original technologies. Some minor referents of web 2.0, like software as a service and data centers, became referents of cloud computing, which uses a natural archetype of clouds as the source domain to reference the target domain of hosted information technology services accessible through multiple devices. As a natural domain, the cloud metaphor is more extensible than web 2.0 and as a result may have more longevity than web 2.0. The cloud computing metaphor also became associated with lightning, electricity, experimentation, and utility through a fuzzy semantic relationship. The utility metaphor worked with cloud to emphasize the ease of implementation of cloud based solutions. As practical problems arose with implementing cloud solutions, new metaphors arose. Some of these worked within the cloud domain, such as the idea of storms, to emphasize the downsides of cloud computing. Other metaphors arose in new source domains to emphasize territory and private ownership in hosted solutions. By providing an in-depth rhetorical analysis of these IT metaphors, this research can serve as a guide for evaluating rhetorical and metaphoric responses to future disruptive technical changes.
Wiren, Jakob. "Data Storage Cost Optimization Based on Electricity Price Forecasting with Machine Learning in a Multi-Geographical Cloud Environment." Thesis, Linköpings universitet, Kommunikations- och transportsystem, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-152250.
Full textEnglund, Carl. "Evaluation of cloud-based infrastructures for scalable applications." Thesis, Linköpings universitet, Medie- och Informationsteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-139935.
Full textNasim, Robayet. "Cost- and Performance-Aware Resource Management in Cloud Infrastructures." Doctoral thesis, Karlstads universitet, Institutionen för matematik och datavetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-48482.
Full textHigh availability, cost effectiveness and ease of application deployment have accelerated the adoption rate of cloud computing. This fast proliferation of cloud computing promotes the rapid development of large-scale infrastructures. However, large cloud datacenters (DCs) require infrastructure, design, deployment, scalability and reliability and need better management techniques to achieve sustainable design benefits. Resources inside cloud infrastructures often operate at low utilization, rarely exceeding 20-30%, which increases the operational cost significantly, especially due to energy consumption. To reduce operational cost without affecting quality of service (QoS) requirements, cloud applications should be allocated just enough resources to minimize their completion time or to maximize utilization. The focus of this thesis is to enable resource-efficient and performance-aware cloud infrastructures by addressing above mentioned cost and performance related challenges. In particular, we propose algorithms, techniques, and deployment strategies for improving the dynamic allocation of virtual machines (VMs) into physical machines (PMs).
Miccoli, Roberta. "Implementation of a complete sensor data collection and edge-cloud communication workflow within the WeLight project." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/22563/.
Full textCarlsson, Daniel. "Dynamics AX in the Cloud : Possibilities and Shortcomings." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-196060.
Full textAnvändningen av molnet är snabbt expanderande och är något som är relevant för alla inblandade inom teknologin. Meningen med det här projektet är att undersöka fördelarna och de möjliga problem som kan uppstå genom användning av Microsoft Dynamics AX I molnet, specifikt Microsoft Azure, istället för lokala datacenter. Det här projektet har utförts hos Scania IT med hjälp av deras nuvarande implementation av Dynamics AX. Arbetet innehåller en omfattande litteraturstudie angående både ERP system och andra system från varierande områden med fokus på molnet. Det beslutades tidigt att fokusera på den nya versionen av Dynamics AX, som för tillfället bara är tillgänglig I molnet, och jämföra denna implementationen med de två versionen som huvudsakligen används idag, AX 2009 och AX 2012. Fördelarna med både AX och Azure som Microsoft produkter är tydliga med välintegrerade hjälpmedel hela vägen från klienterna till servrarna med ett särskilt fokus på säkerhetskopiering och lastbalansering. Det visas hur utvecklare behöver ändra sitt arbetssätt i avseende på integrationer med andra system, särskilt för AX 2009 då ramverken har ändrats. Tillägget av Data Entities betyder att utvecklare kan spara mycket tid på att bara behöva ha koll på en referens till platsen för ett objekt istället för att behöva veta exakt i vilken tabell i databasen objektet befinner sig. Analysen fokuserar på skillnaderna inom fyra olika områden, prestanda & tillgänglighet, skalbarhet, kostnadsbesparingar samt säkerhet & integritet. Kunskapen för analysen kommer framförallt ifrån litteraturstudien samt den kunskap som har intagits från implementationen samt medarbetarna vid Scania idag. Resultatet visar att det finns tydliga fördelar när det kommer till prestanda, kostnadsbesparingar och framför allt, tillgänglighet. Dock är det även tydligt att lagar i många länder ännu inte har hunnit ikapp det faktum att molnet är en av de bättre möjligheterna att spara data i idag. Detta betyder i sin tur betyder att det bästa nästa steget för majoriteten av ERP användarna idag är ett hybrid- eller privatmoln inom landsgränserna.
Henriksson, Johannes, and Alexander Magnusson. "Impact of using cloud-based SDNcontrollers on the networkperformance." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-44152.
Full textShafabakhsh, Benyamin. "Research on Interprocess Communication in Microservices Architecture." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277940.
Full textMed den kraftiga tillväxten av molntjänster under det senaste decenniet har mikrotjänster fått en betydande popularitet i branschen som ett nytt arkitektoniskt mönster. Det erbjuder en moln-baserad arkitektur som delar stora applikationer i en samling små, oberoende och distribuerade paket. Eftersom microservicebaserade applikationer distribueras och körs på olika maskiner, är en av de viktigaste utmaningarna när man utformar en applikation valet av mekanism med vilken tjänster kommunicerar med varandra. Det finns flera metoder för att implementera Interprocess-kommunikation (IPC) i mikrotjänster och var och en har olika fördelar och nackdelar. Medan det finns teoretisk och in- formell jämförelse mellan dem, har denna avhandling tagit ett experimentellt synsätt för att jämföra och kontrastera vanliga former av IPC-kommunikation. I denna avhandling har IPC-metoder kategoriserats i synkrona och asynkrona kategorier. Den synkrona typen består av REST API och Google gRPC, medan asynkron typ använder en meddelandemäklare känd som RabbitMQ. Dessutom har en samling mikroservice för ett e-handelsscenario utformats och utvecklats med alla de tre olika IPC-metoderna. Ett lasttest har utförts mot var- je modell för att erhålla kvantitativa data relaterade till prestandaeffektivitet, och tillgänglighet för varje metod. Att utveckla samma uppsättning funktionaliteter med olika IPC-metoder har erbjudit en kvalitativ data relaterad till skalbarhet och komplexitet för varje IPC-modell. Utvärderingen av experimentet indikerar att även om det inte finns någon universell IPC-lösning som kan tillämpas i alla fall, ska asynkrona IPC-mönster vara det föredragna alternativet vid utformningen av systemet. Ändå tyder resultaten från detta arbete också på att det finns scenarier där synkrona mönster är mer lämpliga.
Kathirvel, Anitha, and Siddharth Madan. "Efficient Privacy Preserving Key Management for Public Cloud Networks." Thesis, KTH, Radio Systems Laboratory (RS Lab), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-148048.
Full textDe flesta program och dokument lagras i ett offentligt moln för lagring och hantering ändamål i en molnmiljö. De stora fördelarna med att lagra program och dokument i offentliga moln är lägre kostnad genom användning av delade datorresurser och ingen upfront infrastruktur costs.However, i detta fall hanteringen av data och andra tjänster är osäker. Därför är säkerhet ett stort problem i en offentlig moln som molnet och nätverket är öppna för många andra användare. För att ge trygghet, är det nödvändigt för dataägare att lagra sina data i det offentliga molnet på ett säkert sätt och att använda en lämplig åtkomstkontroll schema. Utforma en beräkning och kommunikation effektiv nyckelhantering system för att selektivt dela dokument som grundar sig på finkorniga attributbaserad åtkomstkontroll politik i en offentlig moln är en utmanande uppgift. Det finns många befintliga metoder som krypterar dokument före lagring i det offentliga molnet: Dessa metoder använder olika tangenter och en publik nyckel kryptografiskt system för att genomföra attributbaserad kryptering och / eller proxy re-kryptering. Dock har dessa metoder inte effektivt hantera användare som ansluter och lämnar systemet när identitetsattribut och politik förändras. Dessutom är dessa metoder kräver att hålla flera krypterade kopior av samma dokument, som har en hög beräkningskostnad eller ådrar sig onödiga lagringskostnader. Därför fokuserade projektet på design och utveckling av en effektiv nyckelhantering system för att möjliggöra dataägaren att lagra data i en molntjänst på ett säkert sätt. Dessutom, den föreslagna metoden gör det möjligt för molnanvändare att få tillgång till uppgifter lagras i ett cloud på ett säkert sätt. Många forskare har föreslagit viktiga förvaltningssystem för fasta och trådlösa nätverk. Alla dessa befintliga system ke, skiljer sig från de centrala förvaltningssystemen som föreslås i denna avhandling. Först föreslog nyckelhanteringssystemet i denna avhandling ökar Medverkan nivå säkerhet. För det andra, minimerar den föreslagna nyckelhanteringssystemet beräkningskomplexiteten för molnanvändare genom att utföra endast en matematisk operation för att hitta den nya gruppknapp som tidigare beräknades av dataägaren. Dessutom är denna föreslagna nyckelhanteringsschema lämpligt för ett moln nätverk. För det tredje, den föreslagna nyckeldistribution och nyckelhantering systemet utnyttjar integritets bevara metoder och därmed skydda privatlivet för användaren. Slutligen har ett parti viktig uppdatering algoritm (även kallad batch nya nycklar) föreslagits för att minska antalet Ny serieläggning av operationer som krävs för att utföra batch ledighet eller gå med i verksamheten. Nyckelhanteringssystemet som föreslås i denna avhandling är utformad för att minska beräknings-och kommunikations komplexitet i alla utom ett fåtal fall, och samtidigt öka säkerheten och integriteten av uppgifterna.
McIntosh, Linda Anne-Marie. "Reducing Technology Costs for Small Real Estate Businesses Using Cloud and Mobility." ScholarWorks, 2017. https://scholarworks.waldenu.edu/dissertations/3534.
Full textZhou, Lin. "Energy efficient transmitter design with compact antenna for future wireless communication systems." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/33104.
Full textCorser, Kristy L. "Teaching and learning with cloud platforms in the primary school classroom." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/157473/1/Kristy_Corser_Thesis.pdf.
Full textLascano, Jorge Edison. "A Pattern Language for Designing Application-Level Communication Protocols and the Improvement of Computer Science Education through Cloud Computing." DigitalCommons@USU, 2017. https://digitalcommons.usu.edu/etd/6547.
Full textNasim, Robayet. "Architectural Evolution of Intelligent Transport Systems (ITS) using Cloud Computing." Licentiate thesis, Karlstads universitet, Institutionen för matematik och datavetenskap (from 2013), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-35719.
Full textBaksidestext: Intelligent Transport System (ITS) can utilize advances in Information and Communication Technology (ICT) and maximize the capacity of existing transportation systems without building new infrastructure. However, in spite of these technical feasibilities and significant performance-cost ratios, the deployment of ITS is limited in the real world because of several challenges associated with its architectural design. This thesis studies how to design an efficient deployable architecture for ITS, which can utilize the advantages of cloud computing and the publish/subscribe communication model. In particular, our aim is to offer an ITS infrastructure which provides the opportunity for transport authorities to allocate on-demand computing resources through virtualization technology, and supports a wide range of ITS applications. We propose to use an Infrastructure as a Service (IaaS) model to host large-scale ITS applications, and to use a publish/subscribe system as a building block for developing a low latency ITS application. We investigate different strategies to improve performance of an ITS application during service mobility such as utilizing multiple paths to spread network traffic, or deploying recent queue management schemes.
Artikel 4 Network Centric Performance Improvement for Live VM Migration finns i avhandlingen som manuskript. Nu publicerat konferenspaper.
Wiss, Thomas. "Evaluation of Internet of Things Communication Protocols Adapted for Secure Transmission in Fog Computing Environments." Thesis, Mittuniversitetet, Avdelningen för informationssystem och -teknologi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-35298.
Full textMharsi, Niezi. "Cloud-Radio Access Networks : design, optimization and algorithms." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLT043/document.
Full textCloud Radio Access Network (C-RAN) has been proposed as a promising architecture to meet the exponential growth in data traffic demands and to overcome the challenges of next generation mobile networks (5G). The main concept of C-RAN is to decouple the BaseBand Units (BBU) and the Remote Radio Heads (RRH), and place the BBUs in common edge data centers (BBU pools) for centralized processing. This gives a number of benefits in terms of cost savings, network capacity improvement and resource utilization gains. However, network operators need to investigate scalable and cost-efficient algorithms for resource allocation problems to enable and facilitate the deployment of C-RAN architecture. Most of these problems are very complex and thus very hard to solve. Hence, we use combinatorial optimization which provides powerful tools to efficiently address these problems.One of the key issues in the deployment of C-RAN is finding the optimal assignment of RRHs (or antennas) to edge data centers (BBUs) when jointly optimizing the fronthaul latency and resource consumption. We model this problem by a mathematical formulation based on an Integer Linear Programming (ILP) approach to provide the optimal strategies for the RRH-BBU assignment problem and we propose also low-complexity heuristic algorithms to rapidly reach good solutions for large problem instances. The optimal RRH-BBU assignment reduces the expected latency and offers resource utilization gains. Such gains can only be achieved when reducing the inter-cell interference caused by the dense deployment of cell sites. We propose an exact mathematical formulation based on Branch-and-Cut methods that enables to consolidate and re-optimize the antennas radii in order to jointly minimize inter-cell interference and guarantee a full network coverage in C-RAN. In addition to the increase of inter-cell interference, the high density of cells in C-RAN increases the amount of baseband processing as well as the amount of data traffic demands between antennas and centralized data centers when strong latency requirements on fronthaul network should be met. Therefore, we discuss in the third part of this thesis how to determine the optimal placement of BBU functions when considering 3GPP split option to find optimal tradeoffs between benefits of centralization in C-RAN and transport requirements. We propose exact and heuristic algorithms based on combinatorial optimization techniques to rapidly provide optimal or near-optimal solutions even for large network sizes
Cao, Weidan. "Every Cloud Has A Silver Lining: An Investigation of Cancer Patients' Social Support, Coping Strategies, and Posttraumatic Growth." Diss., Temple University Libraries, 2017. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/425014.
Full textPh.D.
This dissertation investigated social support, coping strategies, and posttraumatic growth among cancer patients in China. Study 1 examined sources of social support to explore helpful social support and unhelpful social support from different sources. Optimal matching theory (Cutrona & Russell, 1990) and Goldsmith’s (2004) social support theory served as the theoretical framework for Study 1. Twenty cancer patients in a cancer hospital were recruited to participate in phone interviews. An analysis of the detailed notes of the interviews revealed the major sources of patients’ social support came from family members and nurses. Patients described much more helpful support than unhelpful social support. Several other issues were discussed that were not covered by the research questions but were salient in the interviews were also discussed, such as nondisclosure practices in China and the use of euphemism when disclosing a cancer diagnosis in East Asian countries. The purpose of Study 2 was to test a model of the relationships between social support, uncontrollability appraisal, adaptive coping strategies, and posttraumatic growth. Two rounds of data collection were conducted among 201 cancer patients in a cancer hospital in China. The results of the hierarchical multiple regression indicated that, controlling for demographic factors such as age and education, social support and adaptive coping were positively correlated with posttraumatic growth. Uncontrollability, however, was not significantly correlated with posttraumatic growth. The results of the structural equation model indicated that higher levels of social support predicted higher levels of adaptive coping, higher levels of uncontrollability appraisal predicted lower levels of adaptive coping, and higher levels of adaptive coping predicted higher levels of posttraumatic growth. Moreover, adaptive coping was a mediator between social support and growth, as well as a mediator between uncontrollability and posttraumatic growth. The implications of the findings and the contributions of the dissertation are discussed.
Temple University--Theses
Aldosari, Mansour. "Design and analysis of green mobile communication networks." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/design-and-analysis-of-green-mobile-communication-networks(37b5278a-45da-4a81-b89c-54c7d876586a).html.
Full textJordaan, Pieter Willem. "Synthesis and evaluation of a data management system for machine-to-machine communication." Thesis, North-West University, 2013. http://hdl.handle.net/10394/9073.
Full textThesis (MIng (Computer and Electronic Engineering))--North-West University, Potchefstroom Campus, 2013.
de, Beste Eugene. "Enabling the processing of bioinformatics workflows where data is located through the use of cloud and container technologies." University of the Western Cape, 2019. http://hdl.handle.net/11394/6767.
Full textThe growing size of raw data and the lack of internet communication technology to keep up with that growth is introducing unique challenges to academic researchers. This is especially true for those residing in rural areas or countries with sub-par telecommunication infrastructure. In this project I investigate the usefulness of cloud computing technology, data analysis workflow languages and portable computation for institutions that generate data. I introduce the concept of a software solution that could be used to simplify the way that researchers execute their analysis on data sets at remote sources, rather than having to move the data. The scope of this project involved conceptualising and designing a software system to simplify the use of a cloud environment as well as implementing a working prototype of said software for the OpenStack cloud computing platform. I conclude that it is possible to improve the performance of research pipelines by removing the need for researchers to have operating system or cloud computing knowledge and that utilising technologies such as this can ease the burden of moving data.
Kuylenstierna, Adam. "Underground in the Cloud : En kvalitativ studie om den digitala musikplattformen Soundcloud." Thesis, Stockholms universitet, Institutionen för journalistik, medier och kommunikation (JMK), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-58932.
Full textHakim, Zadok. "Factors That Contribute to The Resistance to Cloud Computing Adoption by Tech Companies vs. Non-Tech Companies." Diss., NSUWorks, 2018. https://nsuworks.nova.edu/gscis_etd/1034.
Full textLiu, Ji. "Gestion multisite de workflows scientifiques dans le cloud." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT260/document.
Full textLarge-scale in silico scientific experiments generally contain multiple computational activities to process big data. Scientific Workflows (SWfs) enable scientists to model the data processing activities. Since SWfs deal with large amounts of data, data-intensive SWfs is an important issue. In a data-intensive SWf, the activities are related by data or control dependencies and one activity may consist of multiple tasks to process different parts of experimental data. In order to automatically execute data-intensive SWfs, Scientific Work- flow Management Systems (SWfMSs) can be used to exploit High Performance Computing (HPC) environments provided by a cluster, grid or cloud. In addition, SWfMSs generate provenance data for tracing the execution of SWfs.Since a cloud offers stable services, diverse resources, virtually infinite computing and storage capacity, it becomes an interesting infrastructure for SWf execution. Clouds basically provide three types of services, i.e. Infrastructure-as-a-Service (IaaS), Platform- as-a-Service (PaaS) and Software-as-a-Service (SaaS). SWfMSs can be deployed in the cloud using Virtual Machines (VMs) to execute data-intensive SWfs. With a pay-as-you- go method, the users of clouds do not need to buy physical machines and the maintenance of the machines are ensured by the cloud providers. Nowadays, a cloud is typically made of several sites (or data centers), each with its own resources and data. Since a data- intensive SWf may process distributed data at different sites, the SWf execution should be adapted to multisite clouds while using distributed computing or storage resources.In this thesis, we study the methods to execute data-intensive SWfs in a multisite cloud environment. Some SWfMSs already exist while most of them are designed for computer clusters, grid or single cloud site. In addition, the existing approaches are limited to static computing resources or single site execution. We propose SWf partitioning algorithms and a task scheduling algorithm for SWf execution in a multisite cloud. Our proposed algorithms can significantly reduce the overall SWf execution time in a multisite cloud.In particular, we propose a general solution based on multi-objective scheduling in order to execute SWfs in a multisite cloud. The general solution is composed of a cost model, a VM provisioning algorithm, and an activity scheduling algorithm. The VM provisioning algorithm is based on our proposed cost model to generate VM provisioning plans to execute SWfs at a single cloud site. The activity scheduling algorithm enables SWf execution with the minimum cost, composed of execution time and monetary cost, in a multisite cloud. We made extensive experiments and the results show that our algorithms can reduce considerably the overall cost of the SWf execution in a multisite cloud
Gråd, Martin. "Improving Conventional Image-based 3D Reconstruction of Man-made Environments Through Line Cloud Integration." Thesis, Linköpings universitet, Medie- och Informationsteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-148452.
Full textMatoussi, Salma. "User-Centric Slicing with Functional Splits in 5G Cloud-RAN." Electronic Thesis or Diss., Sorbonne université, 2021. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2021SORUS004.pdf.
Full text5G Radio Access Network (RAN) aims to evolve new technologies spanning the Cloud infrastructure, virtualization techniques and Software Defined Network capabilities. Advanced solutions are introduced to split the RAN functions between centralized and distributed locations to improve the RAN flexibility. However, one of the major concerns is to efficiently allocate RAN resources, while supporting heterogeneous 5G service requirements. In this thesis, we address the problematic of the user-centric RAN slice provisioning, within a Cloud RAN infrastructure enabling flexible functional splits. Our research aims to jointly meet the end users’ requirements, while minimizing the deployment cost. The problem is NP-hard. To overcome the great complexity involved, we propose a number of heuristic provisioning strategies and we tackle the problem on four stages. First, we propose a new implementation of a cost efficient C-RAN architecture, enabling on-demand deployment of RAN resources, denoted by AgilRAN. Second, we consider the network function placement sub-problem and propound a new scalable user-centric functional split selection strategy named SPLIT-HPSO. Third, we integrate the radio resource allocation scheme in the functional split selection optimization approach. To do so, we propose a new heuristic based on Swarm Particle Optimization and Dijkstra approaches, so called E2E-USA. In the fourth stage, we consider a deep learning based approach for user-centric RAN Slice Allocation scheme, so called DL-USA, to operate in real-time. The results obtained prove the efficiency of our proposed strategies
Adeka, Muhammad I. "Cryptography and Computer Communications Security. Extending the Human Security Perimeter through a Web of Trust." Thesis, University of Bradford, 2015. http://hdl.handle.net/10454/11380.
Full textFawzy, Kamel Menatalla Ashraf. "Vendor Lock-in in the transistion to a Cloud Computing platform." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-209121.
Full textUppsatsen presenterar en studie om de sårbarheter som ett företag som Scania IT har mot inlåsning i övergången till molntjänster. Molntjänster är en term som hänvisar till ett nätverk av servrar som finns på internet för att lagra, hantera och processa data, istället för på en lokal server eller en persondator. Inlåsning är ett resultat i vilket orsakar att företagen behöver betala en betydande kostnad för att flytta mellan molnleverantörer. De effekter som orsakar inlåsning vilket kommer att beskrivas är portabilitet, interoperabilitet och federation, dessa kallas inlåsningseffekter. Målet med forskningen är att hjälpa Scania IT att förstå inlåsning och sårbarheter som de kan möta i övergången till molnet. Dessutom är målet att klarlägga riskerna som de kan ha mot att falla i inlåsning. Det huvudsakliga syftet med forskningen är att presentera de olika inlåsningseffekter som är relaterade till övergången från en molnleverantör till en annan samt de sårbarheter som orsakar företagen att falla i inlåsning. Uppsatsen presenterar skäl som motiverar varför Scania IT ska överväga att använda molnet samt den oro som de kan ha mot användning av en molnleverantör. Resultaten kommer att baseras på en fallstudie av ett liknande företag som har flyttat till en molnleverantör och specifikt Microsoft Azure samt en intervju av Microsoft Azure synvinkel med risken för inlåsning. Slutligen, en rad av intervjuer med olika personer från Scania IT för att extrahera den nuvarande flaskhalsen i utvecklingsprocessen som orsakade företaget att tänka på molntjänster. Resultaten visar att företagen bör överväga många risker och faktorer när de flyttar till molnet, som exempelvis inlåsning, cloud maturity index och deras IT-strategier. Som ett resultat ger examensarbetet nödvändiga rekommendationer för att minimera riskerna för molnet samtidigt som positivitet av molnet.
Boulos, Karen. "BBU-RRH Association Optimization in Cloud-Radio Access Networks." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS209/document.
Full textThe demand on mobile traffic has been largely increasing nowadays. Facing such growth, several propositions are being studied to cope with this challenge. Cloud-Radio Access Networks Architecture (C-RAN) is one of the proposed solutions to address the increased demand, and is a potential candidate for future 5G networks. The C-RAN architecture dissociates two main elements composing the base station: The Baseband Unit (BBU), consisting in an intelligent element to perform baseband tasks functionalities, and the Remote Radio Head (RRH), that consists in a passive antenna element to provide access for serviced User Equipments (UEs). In C-RAN architecture, the BBUs migrate to a Cloud data center, while RRHs remain distributed across multiple sites. Several advantages are derived, such as statistical multiplexing gain, efficiency in resource utilization and power saving. Contrarily to conventional architecture, where each RRH is associated to one BBU, in C-RAN architecture, multiple RRHs can be embraced by one single BBU when network load conditions are low, bringing along several benefits, such as enhanced energy efficiency, and power consumption minimization. In this thesis, the BBU-RRH association optimization problem is addressed. Our aim is to optimize the BBU-RRH association schemes, taking into consideration several criteria. The problem presents many constraints: For example, achieving minimized power consumption while guaranteeing a minimum level of Quality of Service (QoS) is a challenging task. Further, taking into account the interference level variation while turning ON/OFF BBUs is paramount to achieve enhanced spectral efficiency. Moreover, deciding how to re-associate RRHs to BBUs under dynamic load conditions is also a challenge, since connected UEs face handovers (HOs) when RRHs change their associations