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This paper proposes an application-aware multipath flow routing framework that integrates Machine Learning Techniques (MLT) in Software Defined Networks (SDN). Applications generated by the devices are diverse in nature, for each application bandwidth and delay requirements vary. The flows in the network compete for a constrained resource such as bandwidth or low latency path, an intelligent flow...
Multipath TCP (MPTCP) brings promising features of throughput improvement and load balancing by utilizing the multiple available paths. However, adding a subflow without awareness of the network state will result in wasting network resources and degrading MPTCP performance. Finding and operating the proper number of subflows are necessary to achieve the best performance of MPTCP. However, an MPTCP...
IP Mobility has many unresolved issues including triangle routing, session survivability, long delay and packet loss during hand-off. SDN-based IP Mobility promises to mitigate them by taking the advantage of network-wide visibility and centralized control. However, SDN-based approach still has some problems namely 1) large signaling overhead of controller and 2) high hand-off latency as the number...
Service Chaining provides opportunities for network and service providers to implement their services and policies with finer granularity of an individual user or an application. However, the increasing number of Service Chains and middleboxes will introduce a larger number of flow rules and more consumption of Ternary Content Addressable Memory (TCAM), whose capacity is limited due to high cost and...
This paper introduces the Distributed NFV Orchestrator (DiNO). DiNO integrates and orchestrates Software-Defined Networking (SDN) and Network Function Virtualization (NFV) in a physically and logically distributed manner and optimizes their service quality and resource utilization. In the DiNO architecture, Virtualized Network Functions (VNFs), including servers, middleboxes, and QoS, can be dynamically...
In network function virtualization (NFV), the placement of the virtual network function (VNF) significantly affects the load on switches and the efficiency of bandwidth utilization. Suboptimal placement of VNFs in service chains increases the flow rules in the switches and the ping-pong traffic among the VNFs. This paper presents LightChain, an efficient polynomial run time approach for optimizing...
Service chaining is one of the challenges in network function virtualization (NFV), where a sequence of middleboxes apply their service to particular traffic. The challenge of service chaining is that a middlebox may alter the content of packet headers; thus, the context of service chaining for particular traffic gets lost. This paper proposes Segmented Proactive Flow Rule Injection (SPFRI) using...
This paper describes the network architecture of an Asia-wide satellite Internet that considers the situations in developing regions. The design considerations for the architecture are costs, effective use of satellite bandwidth, scalability, and routing strategy when combined with terrestrial links. The architecture includes using one-way shared satellite links to reduce costs, IP multicast to leverage...
Spectroscopic measurements for GMA phenomena have been performed. The studies have reported that the metal vapor behavior greatly affects the arc properties. However, they can be applied only to axially symmetric phenomena because of the assumption used for the measurement. GMA welding is normally performed while moving and most of the phenomena become axially asymmetric. In this study, we constructed...
This paper proposes the enhancement of Wi-Fi quality assessment with a hybrid approach, which uses small and low-cost devices like Raspberry Pi, and mobile devices like smart-phones. Existing solutions for Wi-Fi quality assessment are expensive, and guarantee for continuous monitoring is not given. A monitoring device like a spectrum analyzer, needs the user to follow a specified path to cover entire...
Wireless ad-hoc networks are unplanned, quickly deployable, infrastructureless, and realistic for networking in emergency or restricted situations. They have actively been studied and proposed for post-disaster recovery. Our approach uses Linux Live USB nodes, which can be any available laptop computer at disaster-affected site, to boot the guest OS using USB flash drive with a variety of customized...
Traditional network monitoring involving packet capturing or flow sampling has many challenges such as scalability, accuracy and availability of processing resource when networks become large-scale, high-speed and heterogeneous. SDN is a promising approach to address these challenges, but each SDN switch has it's own capacity limitation, such as it's cache memory called TCAM, and thus it needs coordination...
Arc plasma diagnostics by spectroscopy have been often used to measure the arc properties, such as the temperature. Measurements of an axially asymmetrical arc plasma require the optical computed tomography technique. This study constructed the simultaneous and multidirectional measurement system by six sets of CCD camera and interference filter with monochromatic imaging method. The deviation of...
Scalability of Ethernet is a known issue where communication is disturbed by broadcast traffic caused by a large number of nodes in a single broadcast domain. This paper proposes Extensible Transparent Filter (ETF) for Ethernet using SDN, that suppresses broadcast traffic in a broadcast domain by selecting an appropriate outgoing port of the switch through which the target host of broadcast packet...
We address the problem of designing a communication system for deploying under disaster situations where the pre-disaster communication infrastructure has been uprooted. The disaster communication system is required to aid in rescue effort by providing text, voice, and video communication links between the field worker and the operation center. It is also required to provide some communication services...
We report the design and development of a software system that provides a unified platform for acquisition, storage and retrieval of scientific, situational and infrastructural data in the context of disasters. The system supports (i) data acquisition from heterogeneous sources (including sensor data from various research groups, field data from disaster management agencies and citizens, and relevant...
We address the problem of designing a communication system for deploying under disaster situations where the pre-disaster communication infrastructure has been uprooted. The disaster communication system is required to aid in rescue effort by providing text, voice, and video communication links between the field worker and the operation center. It is also required to provide some communication services...
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