Wonhyuk Lee

A healthcare information sharing scheme in distributed cloud networks

Current information & communication technology infrastructures are struggling for a wide variety of devices, services, and business and technology evolution. Cloud computing is becoming a promising platform and has developed rapidly. In contrast to traditional enterprise IT solution, it enables enterprises to procure computing resources on demand basis and delegate management of all the resources to the cloud service provider. Healthcare information networks have emerged as one of the major research area in the cloud networks. Healthcare information is communication and information systems and technology that facilitate quality patient care, progressive medical education, and innovative research. Healthcare information networks must ensure the reliability and efficiency because it transfers highly personal data. Thus, it guarantees and keeps a certain level of transfer efficiency. In the distributed cloud environments, management costs for the network and computing resources are solved fundamentally through the integrated management system. It can increase the cost savings to solve the traffic explosion problem of core network via a distributed micro datacenters (DCs). However, traditional flooding methods may cause a lot of traffic because it had to send data to all the neighbor DCs. Restricted Path Flooding algorithms have been proposed for this purpose. In large networks, there is still the disadvantage that may occur traffic. In this paper, we develope lightweight path flooding algorithm to improve existing flooding algorithm using hop count restriction. This paper also investigates the problem of partial information sharing.

Service platform and monitoring architecture for network function virtualization (NFV)

With the advent of cloud and virtualization technologies and the integration of various computer communication technologies, today’s computing environments can provide virtualized high quality services. The network traffic has also continuously increased with remarkable growth. Software defined networking/network function virtualization (SDN/NFV) enhancing the infrastructure agility, thus network operators and service providers are able to program their own network functions on vendor independent hardware substrate. However, in order for the SDN/NFV to realize a profit, it must provide a new resource sharing and monitoring procedures among the regionally distributed and virtualized computers. In this paper, we proposes a NFV monitoring architecture based practical measuring framework for network performance measurement. We also proposes a end-to-end connectivity support platform across a whole SDN/NFV networks has not been fully addressed.

The Design of Routing Framework for Protection & Restoration of Multi-Layer Based on GMPLS Network

The IP layer of obstacles, such as routers optical-transmission malfunction in the hierarchy can not handle. These types of obstacles that need and packet-level rerouting, if packet-level rerouting long time backup LSP or tunneling path through the ability to automatically switchover needs. Disability for a certain amount of resilience backup (protection), or to require extra capacity. There is no unified control, such as GMPLS flat-recovery scheme, and the other is performed independently of any information about the hierarchys behavior can never know.The credibility and survival of the research is to build networks that can provide for GMPLS network, multilayer protection and recovery capabilities to provide a signal / routing framework and objectives of this paper.

A method for enhancing end-to-end transfer efficiency via performance tuning factors on dedicated circuit networks with a public cloud platform

There has been a great deal of recent research interest regarding the storage and utilization of big data via remote cloud platforms. The efficiency of large data transfers from remote cloud platforms is a critical issue, and dedicated networks are used for data transfer. To resolve the data transfer efficiency issue, it is necessary to tune the L2-related performance items in the transport equipment and to regulate performance factors, such as window size, between IP layer servers, during the configuration of an end-to-end research network. It is also necessary to tune factor values related to performance items in transport equipment. System level kernel parameter tuning is also needed and results in improved throughput. Here, we measure throughput according to L2-related tuning factors and IP levels, including kernel parameter turning, and present an analysis of the measurement results. The experimental results show that end-to-end servers with tuned factors, in addition to system level kernel parameter tuning, can effectively utilize the available bandwidth.

Designing of Healthcare Information Network Using IPv6 Cloud Networks

Information networks have emerged a major research area in the interest of healthcare. There are several applications in the R&D field of healthcare. Healthcare Network must ensure the reliability and efficiency because it transfer data of health. We consider distributed cloud systems, which deploy IPv6 and agents that are geographically distributed over a large number of locations in a wide-area network. In this article, we also argue for a healthcare information management model that provides higher-level connectivity and logical network abstraction that are integral parts of wellness applications.

A Virtualization and Management Architecture of Micro-Datacenter

With the cloud computing, storage and computing resources are moving to remote resources such as virtual servers and storage systems in large DCs(Data Centers), which raise many performance and management challenges. We consider distributed cloud systems, which deploy micro DC that are geographically distributed over a large number of locations in a wide-area network. In this article, we also argue for a micro DC-based network model that provides higher-level connectivity and logical network abstraction that are integral parts of wellness applications. We revisit our previously proposed logical network models that are used to configure the logical wellness network.

Revised P2P Data Sharing Scheme over Distributed Cloud Networks

Distributed cloud networks can be seen as a cooperative network composed of millions of hosts spread around the world and it is also a distribut-ed shared resource. In the P2P technology, as opposed to the existing client/server concept, devices are actively connected with one another in order to share the resources and every participant is both a server and a client at the same time. In P2P distributed cloud networks, peers are able to directly share and exchange information without the help of a server. This results in a prompt and secure sharing of network resources and data handling. However, flooding algorithm that is used in distributed P2P network generated query message excessively. Our objective in this paper is to proposes a presents a restricted path flooding algorithm that can decrease query message’s occurrence to solve P2P network’s problems. It includes concepts as well as systematic procedures of the proposed scheme for fast path flooding in distributed P2P distributed cloud networks.

A revised cache allocation algorithm for VoD multicast service

The Internet is replacing the traditional telephone network as the ubiquitous network infrastructure. Internet customers are increasing at an exponential rate and will continue to increase in the near future. Among the various Internet services, IPTV VoD (Video on Demand) service is expected to be one of the most popular services. In general, for deploying streamed video service, it is likely to use proxy by locating it nearby end-users. The use of proxy in on-demand media streaming service can help reduce the server streaming load and reduce the startup delay of media playback due to swift retrieval of beginning portion of media. We had proposed a cache allocation scheme for server-proxy media streaming environment by utilizing the advantage of threshold-based multicast mechanism. However it suffer from a little radical change of threshold value. In this paper, enhanced multicast-based server-proxy on-demand media streaming algorithm to IPTV VoD services is presented from the storage, caching size and bandwidth requirement viewpoints.

A fault tolerant channel allocation scheme in distributed cloud networks

With the cloud computing, storage and computing resources are moving to remote resources such as virtual servers and storage systems in large datacenters, which raise many performance and management challenges. The distributed cloud networks must have an ability to maintain an acceptable level of service during network failures to provide high resilience against service failures. This paper presents an eccentric fault tolerant path grouping scheme that can achieve mobility independent Quality of Service guaranteed services in distributed cloud networks To make this possible, we propose a path allocation and restoration strategy called “Reverse Shared Risk Link Group” and demonstrates how this concept can be applied to minimize recovery contention in cloud networks and to assess the network convergence associated with failures. To reflect little more actual situations, we assume that the bandwidth of cloud connection requests can be some fraction of the lightpath capacity. Simulation results show that the proposed recovery scheme outperforms other schemes with fewer signaling traffics and contention probability. Very fast restorability can be accomplished for multiple failures. We also has developed an analytical model and performed analysis for the proposed scheme in terms of two performance factors: mean system time and reservation blocking probability.

A Virtualized Network Model for Wellness Information Technology Research

It occurs the needs of video-conferencing to exchange the know-how between domestic hospitals and medical school. It is the time to study of deducting a new wellness service considering diverse opinions. In this paper, we study the secure transfer of wellness information, especially medical data and for sharing to the network model.