Ji-Young Kwak

A Unified Remote Console Based on Augmented Reality in a Home Network Environment

We introduce a unified remote console with an augmented reality (AR) interface to interact with appliances in a home network environment. Computer vision techniques are used in order to implement the AR interface. With the introduced remote console, users can control multiple appliances with a single remote console in intuitive ways such as gestures. It can also be used to manage multimedia files between appliances. For example, a user can move video clips from a camcorder to a TV set without any physical action of connecting appliances, if she uses the remote console. We used an open-standard middleware, UPnP, for our implementation.

The study on configuration of multi-tenant networks in SDN controller

The Virtual Tenant Network (VTN) is provides multi-tenant virtual network on an SDN controller. Conventionally, huge investment in the network systems and operating expenses are needed because the network is configured as a silo for each department and system.

Optimal placement of service function in service function chaining

In service function chaining (SFC), an ordered list of service functions (SFs) is specified for network services, and those SFs should be placed in appropriate service nodes (SNs) to satisfy the given service latency requirement. In this paper, we formulate an integer non-linear programming (INLP) problem for the optimal placement of SFs when the latency requirement for network services and network conditions (e.g., link latency and SN capacity) are given. Evaluation results show that the optimal placement can achieve lower latency than conventional schemes.

On performance of OpenDaylight clustering

Software-defined networking (SDN) is moving from its initial deployment in small-scale data center networks to large-scale carrier-grade networks. In such environments, high availability and scalability are two of the most prominent issues and thus extensive work is ongoing. In this paper, a well-known open source project, OpenDaylight (ODL) is analyzed in terms of network state database partition/synchronization and controller failover/load balancing mechanisms. We also present experimental results on the flow rule installation throughput and the failover time upon a controller failure in ODL.

RealSSim: a simulator for indoor sensor network systems

Existing sensor network simulators are not appropriate for indoor sensor network systems. We present RealSSim, the sensor network simulator especially developed for indoor sensor networks. RealSSim considers the structure of buildings and the quality of construction materials for accurate radio propagation analysis. It also supports an attractive visualization of the level as commercial products. In our demonstration, we show the whole process of simulation for two indoor sensor network systems.

Follow-Me services framework using the session initiation protocol

In this paper, we present the follow-me services framework that provides connected ubiquitous services. This follow-me services framework keeps the service session based on Session Initiation Protocol (SIP). The service session of the follow-me services framework is preserved even though an end-user moves from one computing environment to others. For getting the follow-me services, all that he has to do is to carry a small mobile pad, such as PDA or Cellular phone, which shows a list of devices that he can use as I/O devices of the on-going service session. He does not have to re-setup the session. When he clicks and selects the proper device among the devices listed on the pad, the session is immediately migrated to the selected device. In this paper, we describe the design of follow-me services framework based on SIP and X.10 that supports both the user mobility and service session preservation in the ubiquitous wired/wireless network environment.

Using the Session Initiation Protocol for Connected Multimedia Services in a Ubiquitous Home Network Environment

This paper shows how connected multimedia services can be integrated within a networked embedded system. Such services can preserve a multimedia session even though the end-user moves from one computing environment to another. To benefit from immediate multimedia services, the user only needs to carry a small mobile pad, such as a PDA or a Cellular phone showing a list of I/O devices that can be used for an on-going multimedia session. It is not required to re-establish the session. When the user clicks and selects a suitable device from the list, the session is immediately migrated to the selected device. This paper focuses on the session preservation protocol and describes how we use SIP (Session Initiation Protocol) for session preservation. Our integrated architecture provides several features: registration and authentication of the mobile user and connected devices, detection of user’s leave and presence, and session preservation. We also present an illustrative application: the connected video surveillance. We describe the design of a connected multimedia services system based on X.10 and SIP that supports both user mobility and multimedia session preservation in a ubiquitous wired/wireless home network environment.

A Two-Stage Failover Mechanism for High Availability in Service Function Chaining

Service function chaining (SFC) enables specific network flows to be processed through an ordered set of service functions. In this paper, we propose a two-stage failover mechanism to provide high availability (HA) in SFC. In the proposed mechanism, a secondary service function path (SFP) is pre-computed, which is maximally disjointed with the primary SFP, and a backup service function instance (SFI) is prepared for each service function. For a failure event, the first local repair stage is examined by means of the preconfigured backup SFI. If the backup SFI is not available and/or any link is failed, the second end-to-end repair stage is triggered by replacing the primary SFP with the secondary SFP. Simulation results demonstrate that the proposed failover mechanism can reduce the recovery time by 50%-75% compared to the conventional approach.

The Design of Traffic-Aware Intelligent Control System on Software-Defined Cloud Networking

The QoS requirements of various services have created a big challenge in the virtualization environments for cloud networking that cannot support the fine-grained network QoS management. As an emerging technology for satisfying these requirements, the Software Defined Networking (SDN) has the potential to enable dynamic configuration and control for the enhanced network management. This paper presents the design of an intelligent controller based on network policy in the environments of virtual networks that hide the details of an underlying physical topology. The proposed controller performs the mechanism for policy-driven intelligent control to provide differentiated virtual network services based on the content of an OpenFlow packet header and mapping relationships between physical infrastructure and virtual overlay network. With this approach, the intelligent controller enables the deployment of various services on multiple virtual networks as well as the flexible management for achieving a better QoS. Furthermore, it can distribute the traffic with different QoS requirements on available paths under the constraints of available resources by adopting the structure for enforcing the QoS policy of flows.

iNaaS: OpenStack and SDN/OpenFlow based network virtualization with OpenlRIS

OpenlRIS-iNaaS virtual network SDN controller allows data center networks to keep pace with IT development regardless of performance or features by transitioning from closed to open networks, from hardware dependency to full programmability, from fragmented technologies to full quality assurance, and from complete overhaul to gradual evolution.