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In Software Defined Networking, the role of the centralized controller is paramount. Some SDN controllers adopt a distributed clustering mechanism for keeping normal operation of the whole network. Unfortunately, the data loss and the lack of consistency are unavoidable in this approach, because many controllers depend on volatile memory to store most of the important data. In case of restarting or...
This paper describes a method to recognize a Quick Response Code (QR) a novel. The QR Code is a two-dimensional code, which is currently used in various fields. According to the salient growth smartphone market, the recognition distance of QR Code is increased but the recognition angle is still limited. To tackle the issue, we propose a QR Code recognition method using ‘cloud-based pre-generated image...
In this paper, we studied for the transmission of message and voice using CCNx that is one of the Content Centric Network(CCN) projects. CCN is considered as a way to solve the explosive growth of Internet traffic. In order to apply CCN to the common services that are widely used, we developed applications that send message and voice. The application can operate without a separate server by using...
The use of the proxy server is being extended steadily in order to provide various web services and improve the quality of web service. However, passing many proxy servers may degrade the quality of web service, because of increasing HTTP message processing time. In this paper, we propose a scheme that bypasses many proxy servers constituting proxy chain. Furthermore, we perform network simulation...
Recently, as the smartphone market is growing rapidly, the amount of using QR Code with smartphone is increasing together. This paper proposes a new method for improving the rate of QR Code recognition on smartphone. In some angles, sometimes, a few applications cannot recognize QR code. So, this method make it possible to recognize the QR Code any angle. In order to find an original QR Code we proposes...
In this paper, we propose extended code architecture to express more information in existing iBeacon. Information that is available to the user is limited to 4byte because user can only use Major and Minor of iBeacon. Proposed scheme can use more information by transmitting consecutively Beacon signal containing classification and detailed information. When it comes to using more information of iBeacon,...
Global research on B4G/5G is widely started. And software enabled wireless network evolution is largely impacted by IT industry — cloud computing, SDN, and CCN. However, most research on cellular network from academia is hard to deploy on real cellular network due to closed ecosystem and licensed spectrum. We propose an open source wireless switch as a research platform for B4G/5G network. Through...
Compare with the sensing-based spectrum decision scheme, the probability-based spectrum decision scheme has been shown to yield a shorter queuing delay time in Cognitive Radio (CR) system that consists of many Primary Users (PUs) and Secondary Users (SUs). However, the former scheme had cumbersome algorithms and slowly converging speed. In this paper, by introducing Lagrange function, we propose a...
FiRST (Future Internet Research for Sustainable Test-bed) is the future internet platform development project being performed in Korea. The goal of the project is to create the virtualized and dynamic service creation environments over future internet networks; it is an experimental project to realize future innovative service ideas over real network environments. Among this, cloud computing is the...
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