This study aims to examine the effects of transforming a monolithic server system into a microservice architecture, focusing on the increased latency introduced by using a microservice orchestrator. The microservice orchestrator was implemented using an OpenFlow switch controlled by the Beacon and Ryu OpenFlow controllers. These controllers, along with the round robin, random assign and a server-aware load balancing algorithm, were all compared in order to find the combination resulting in the lowest latency and highest achieved server balance in varying network environments. We show that the OpenFlow switch enforces a client-aware load balancing policy and that only the initial request is handled by the controller, effectively reducing the importance of choosing the optimal OpenFlow controller. In addition, the round robin load balancer was preferred when dealing with homogeneous requests, and a server-aware load balancer was required for heterogeneous requests. For most requests, the system would only slow down by a few microseconds using the proposed architecture. However, for 0.001\% of all requests, the slowdown was much more significant, with each of those requests being at least 100 times slower than when using a monolithic server architecture.

This master's thesis deals with the design and implementation of universal user interface for detection devices used in Laser-induced breakdown spectroscopy. The design and implementation are based on analysis of current state of instrumentation used in laser spectroscopy. The user interface should be able to work with high repetition frequency of measurement. Acquired spectra should be visualised to user and it is also necessary to save this data on hard drive. The resulting application must be universal. It means the application must support various types and vendors of detection devices.

The Internet of Things (IoT) is a technology aimed at developing a global network of machines and devices that can interact and communicate with each other. Supporting IoT, therefore, requires revisiting the Internet’s best effort service model and reviewing its complex communication patterns. In this dissertation, we explore the unique characteristics of IoT traffic and examine IoT systems. Our work is motivated by the new capabilities offered by modern Software Defined Networks (SDN) and blockchain technology. We evaluate IoT Quality of Service (QoS) in traditional networking. We obtain mathematical expressions to calculate end-to-end delay, and dropping. Our results provide insight into the advantages of an intelligent edge serving as a detection mechanism. Subsequently, we propose SADIQ, SDN-based Application-aware Dynamic Internet of things QoS. SADIQ provides context-driven QoS for IoT applications by allowing applications to express their requirements using a high-level SQL-like policy language. Our results show that SADIQ improves the percentage of regions with an error in their reported temperature for the Weather Signal application up to 45 times; and it improves the percentage of incorrect parking statuses for regions with high occupancy for the Smart Parking application up to 30 times under the same network conditions and drop rates. Despite centralization and the control of data, IoT systems are not safe from cyber-crime, privacy issues, and security breaches. Therefore, we explore blockchain technology. In the context of IoT, Byzantine fault tolerance-based consensus protocols are used. However, the blockchain consensus layer contributes to the most remarkable performance overhead especially for IoT applications subject to maximum delay constraints. In order to capture the unique requirements of the IoT, consensus mechanisms and block formation need to be redesigned. To this end, we propose Synopsis, a novel hierarchical blockchain system. Synopsis introduces a wireless-optimized Byzantine chain replication protocol and a new probabilistic data structure. The results show that Synopsis successfully reduces the memory footprint from Megabytes to a few Kilobytes with an improvement of 1000 times. Synopsis also enables reductions in message complexity and commitment delay of 85% and 99.4%, respectively

Chain growth condensation polymerization is a powerful tool towards the synthesis of well-defined polyamides. This thesis focuses on one hand, on the synthesis of well-defined aromatic polyamides with different aminoalkyl pendant groups with low polydispersity and controlled molecular weights, and on the other hand, on studying their thermal properties. In the first project, well-defined poly (N-octyl-p-aminobenzoate) and poly (N-butyl-p-aminobenzoate) were synthesized, and for the first time, their thermal properties were studied. In the second project, ethyl4-aminobenzoate, ethyl 4-octyl aminobenzoate and 4-(hydroxymethyl) benzoic acid were used as novel efficient initiators of ε-caprolactone with t-BuP2 as a catalyst. Macroinitiator and Macromonomer of poly (ε-caprolactone) were synthesized with ethyl 4-octyl aminobenzoate and ethyl 4-aminobenzoate as initiators to afford polyamide-block-poly (ε-caprolactone) and polyamide-graft-poly (ε-caprolactone) by chain growth condensation polymerization (CGCP). In the third project, a new study has been done on chain growth condensation polymerization to discover the probability to synthesize new polymers and studied their thermal properties. For this purpose, poly (N-cyclohexyl-p-aminobenzoate) and poly (N-hexyl-p-aminobenzoate) were synthesized with low polydispersity and controlled molecular weights.

京都大学 / 0048 / 新制・課程博士 / 博士(情報学) / 甲第22809号 / 情博第739号 / 新制||情||126(附属図書館) / 京都大学大学院情報学研究科通信情報システム専攻 / (主査)教授 大木 英司, 教授 守倉 正博, 教授 原田 博司 / 学位規則第4条第1項該当 / Doctor of Informatics / Kyoto University / DFAM

This thesis covers utilization of software defined networks for lawful interception purposes. Based on specific implementation of lawful interception system SLIS developed by Sec6Net group, suggests improvements aiming at more precise identification of intercepted users and better effectivity of system resources. First aim is achieved by implementation of a new module for dynamic identification component while the other one alters configuration mechanism for probes and OpenFlow switches.

The main goal of this master's thesis is to apprise of principles of Cisco One Platform Kit based on software defined networks and with monitoring techniques in that type of networks. The focus is concentrated on monitoring the quality of Voice over IP communication. Next part of this thesis is a proposal and implementation of the extensible monitoring environment OneMon on the Cisco One Platform Kit. It is possible to extend OneMon environment using specific analyzers to monitor various types of network traffic. The part of this master's thesis is also implementation of VoIP traffic analyzer for SIP and RTP protocols. This analyzer provides information about phone calls and their quality in a monitored segment of a computer network.

In this diploma thesis is described new network architecture also known as software defined networks. In first part of work are explained and described tasks of individual architecture layers. Work includes discussion about advantages and disadvantages of these networks. In next part is described OpenFlow protocol which allows to controller communicate with underlying hardware devices. Last part contains proposal of laboratory excercises which demonstrate SDN technology.

Au cours des dernières années, la croissance des architectures de réseaux de télécommunication a rapidement augmenté pour suivre un trafic en plein essor. En outre, leur consommation d'énergie est devenue un enjeu Important, tant pour son impact économique qu'écologique. De multiples approches ont été proposées pour la réduire. Dans cette thèse, nous nous concentrons sur l'approche Energy Aware Routing (EAR) qui consiste à fournir un routage valide tout en diminuant le nombre d'équipements réseau actifs. Cependant, les réseaux actuels ne sont pas adaptés au déploiement de politiques vertes globales en raison de leur gestion distribuée et de la nature fermée des périphériques réseau actuels. Les paradigmes de Software Defined Network (SDN) et de Network Function Virtualization (NFV) promettent de faciliter le déploiement de politiques vertes. En effet, le premier sépare le plan de contrôle et de données et offre donc une gestion centralisée du réseau. Le second propose de découpler le logiciel et le matériel des fonctions réseau et permet une plus grande flexibilité dans la création et la gestion des services réseau. Dans cette thèse, nous nous concentrons sur les défis posés par ces paradigmes pour le déploiement de politiques EAR. Nous consacrons les deux premières parties aux SDNs. Nous étudions d'abord les contraintes de taille de table de routage causées par la complexité accrue des règles, puis le déploiement progressif de périphériques SDN dans un réseau actuel. Nous concentrons notre attention sur NFV dans la dernière partie, et plus particulièrement nous étudions les chaines de fonctions de services. / In the recent years, the growth of the architecture of telecommunication networks has been quickly increasing to keep up with a booming traffic. Moreover, the energy consumption of these infrastructures is becoming a growing issue, both for its economic and ecological impact. Multiple approaches were proposed to reduce the networks' power consumption such as decreasing the number of active elements. Indeed, networks are designed to handle high traffic, e.g., during the day, but are over-provisioned during the night. In this thesis, we focus on disabling links and routers inside the network while keeping a valid routing. This approach is known as Energy Aware Routing (EAR). However current networks are not adapted to support the deployment of network-wide green policies due to their distributed management and the black-box nature of current network devices. The SDN and NFV paradigms bear the promise of bringing green policies to reality. The first one decouples the control and data plane and thus enable a centralized control of the network. The second one proposes to decouple the software and hardware of network functions and allows more flexibility in the creation and management of network services. In this thesis, we focus on the challenges brought by these two paradigms for the deployment of EAR policies. We dedicated the first two parts to the SDN paradigm. We first study the forwarding table size constraints due to an Increased complexity of rules. We then study the progressive deployment of SDN devices alongside legacy ones. We focus our attention on the NFV paradigm in the last part, and more particularly, we study the Service Function Chaining problem.

Under the umbrella of Internet of Things (IoT) and Internet of Everything (IoE), new applications with diverse requirements have emerged and the traditional System-on-Chips (SoCs) were unable to support them. Hence, new versatile SoC architectures were designed, like chiplets and Cloud-of-Chips (CoC). A key component of every SoC, is the on-chip interconnect technology, which is responsible for the communication between Processing Elements (PEs) of a system. Network-on-Chip (NoC) is the current widely used interconnect technology, which is a layered, scalable approach. However, the last years the high structural complexity together with the functional diversity and the challenges (QoS, high latency, security) of NoC motivated the researchers to explore alternatives of it. One NoC alternative that recently gained attention is the Software Defined Network-on-Chip (SDNoC). SDNoC originated from Software Defined Network (SDN) technology, which supports the dynamic nature of future networks and applications, while lowering operating costs through simplified hardware and software. Nevertheless, SDN technology designed for large scale networks. Thus, in order to be ported to micro-scale networks proper alterations and new hardware architectures need to be considered.In this thesis, an exploration of how to embed the SDN technology within the micro scale networks in order to provide secure and manageable communication, improve the network performance and reduce the hardware complexity is presented. Precisely, the design and implementation of an SDNoC architecture is thoroughly described followed by the creation and evaluation of a novel SDNoC communication protocol, called MicroLET, in order to provide secure and efficient communication within system components. Furthermore, the security aspect of SDNoC constitutes a big gap in the literature. Hence, it has been addressed by proposing a secure SDNoC Group Key Agreement (GKA) communication protocol, called SSPSoC, followed by the exploration of Byzantine faults within SDNoC and the investigation of a novel Hardware Trojan (HT) attack together with a proposed detection and defend method. / Doctorat en Sciences de l'ingénieur et technologie / info:eu-repo/semantics/nonPublished