Sungwon Lee

• University of California, Los Angeles

Along with the fourth industrial revolution, the use of unmanned aerial vehicles (UAV) has grown very rapidly over the past decade. With this rapid growth, studies using UAVs are underway in various areas. UAVs are more economical and effective when utilizing several nodes rather than operating a single aircraft. In general, UAVs collect and transm...

In our modern world, many Internet of Things (IoT) technologies are being researched and developed. IoT devices are currently being used in many fields. IoT devices use Wi-Fi and Bluetooth, however, communication distance is short and battery consumption is high. In areas such as smart cities and smart farms, IoT technology is needed to support a w...

The VANET (Vehicle Ad Hoc Network) is gathering attention for autonomous vehicles and the MANET (Mobile Ad Hoc Network) is attracting interest as well. Therefore, efforts have been made to overcome the challenges of the VANET in which the topology changes in real time and instability exists due to the difference in speed and physical phase. Particu...

The Internet penetration rate is rising all over the world. In South Korea, there is no area which does not have Ethernet ports and Wi-Fi. So many people are familiar with network, Internet. However, there are still many countries and regions that do not know the weather today because the Internet is not available yet. To solve this problem, many p...

This paper proposes a virtualized network function orchestration system based on Network Function Virtualization (NFV), one of the main technologies in 5G mobile networks. This system should provide connectivity between network devices and be able to create flexible network function and distribution. This system focuses more on access networks. By...

This paper proposes a method whereby a device can transmit and receive information using a beacon, and also describes application scenarios for the proposed method. In a multi-device to multi-device (MD2MD) content-centric networking (CCN) environment, the main issue involves searching for and connecting to nearby devices. However, if a device can’...

In this paper, we proposed and developed Function-Oriented Networking (FON), a platform for network users. It has a different philosophy as opposed to technologies for network managers of Software-Defined Networking technology, OpenFlow. It is a technology that can immediately reflect the demands of the network users in the network, unlike the exis...

In this paper, we proposed a novel ant colony optimization model, Ant Local and the improved model, Simple Backtracking Update. With these algorithms, we developed an ACO routing agent on Linux for the real network. And we validated and evaluated these on Mininet environment using our program.

In this paper, we studied for the synchronization of CCNx that is one of the Content Centric Network (CCN) projects by using Hazelcast. CCN is considered as a way to solve the explosive growth of Internet traffic. Hazelcast is an open source In-Memory Data Grid. Hazelcast, that one of the consensus-based in-memory data grid, has the strength to spe...

Owing to an increase in mobile devices and the advent of the Internet of Things (IoT), mobile traffic has increased exponentially. Consequently, a wide range of research on handover has been conducted to provide mobile device users with stable network quality. Most research on handover uses a network-dependent method that establishes a new protocol...

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 m...

Application development platform is the most important environment in IT industry. There are a variety of platforms. Although the native development enables application to optimize, various languages and software development kits need to be acquired according to the device. The coexistence of smart devices and platforms has rendered the native deve...

Needs of new services and complexity of network are increasing rapidly nowadays. To resolve this states, this paper aim to implement VNF (Virtualized Network Function), which operates on the open network platform. And VNF is implemented based on existing open source. Especially, this paper focus on AP (Access Point) control using CoovaChilli. Also,...

Existing NAT solves to IP address exhaustion problem binding private IP address and public IP address, and NAT traversal such as hole punching scheme enables to communicate End-to-End devices located in different private networks. However, such technologies are centralized the workload at NAT gateway and increase transmission delay caused by packet...

The Network architecture using the deployment of VNF (Virtual Network Function) based on NFV(Network Functions Virtualization) enables to provide fast service to the user, since it has flexible structure in mobile traffic. In this paper, we propose the network configuration scheme capable of VNF deployment through low-cost compute node for the smal...

Open Source Hardware is widely used as enterprise standard device because it has high performance for its price. Traditional enterprise Wireless Local Area Network has the limitation of functionality and scalability by the deployed network equipment. To solve this problem, we propose ‘Web of Place Access Point’ using raspberry pi that enable to man...

With the spread of mobile devices and development of the network, the user can use the data anytime anywhere. Especially, most users have become more sensitive to the quality of communication for the use of real-time video services. In this paper, we propose the SDN-based device-assisted network that improves network environment by device's feedbac...

A programmable Network is a new architecture that can react the rapidly changing network service and fulfill diverse requirements of networks. In this paper, we develop OpenFlow testbed named Pi Stack Switch using low-priced Single Board Computer and OpenSource based virtual switch. Also, we implement programmable network using SDN controller calle...

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 rec...

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...

Mobile cloud service is the most important traffic generator today, and high data rate services in this area are increasing. The Virtual Desktop Infrastructure (VDI) is a circuit-like service that is widely deployed owing to its security merits and the resource constraints of mobile devices. However, VDI requires a high and guaranteed virtually con...

Mobile traffic is currently the most important traffic on the Internet, both domestically and internationally. This is predominantly attributable to widespread cloud computing-based services on mobile networks. Fifth generation (5G) mobile networks are expected to comfortably accommodate this type of traffic by supporting 1,000 times faster speeds...

The number and size of resource constituting the web page has been increasing steadily, and this circumstance leads to rapidly falling quality of web service in mobile network that offer relatively higher delay. Moreover, Improving the quality of a web services protocol is difficult to provide network function because the current network architectu...

JavaScript is widely used to offer interactive web service and dynamic content. However, the number and size of JavaScript constituting the web page has been increasing steadily, and this circumstance leads to falling web performance. In this paper, we suggest a scheme for acceleration of JavaScript transmission considering software module reusabil...

In this paper, we suggest about MIH (Media Independent Handover) supporting fully distributed handover in heterogeneous network based on Open vSwitch and OpenFlow. Although, personal mobile devices which are released recently have more than 2 mobile network interfaces, there is a small chance to utilize them simultaneously. To do this, MIH is sugge...

Google proposed the new application-layer protocol named SPDY with the purpose of complementing problems of HTTP/1.1 to improve web speed. In this paper we evaluate the SPDY protocol’s performance in a variety ofmobile environment to examine the characteristics of the SPDY protocol and compare the differences between the existing protocol and SPDY...

In the field of Geographic Information Systems, Volunteered Geographic Information (VGI) are achieving through the open source map database (DB) construction approach. Multiple map DB providers employ open source technologies in attempting to reduce unknown map information in their proprietary maps. In this paper, we survey and overview an eXtensib...

IEEE 802.11 WLAN is being considered to handle rapidly growing mobile data requirements. IEEE 802.11 WLAN providing faster data rates than cellular, but mobility is not considered. In this paper, I propose that based on received from Around AP network information, selects candidate access AP networks and make-before-break handover WiMAX. Proposed s...

Bio-signal applications were widely researched for several areas, using low power wireless technologies. However, standard communication protocols are not defined, and the raw bio-signal information is transferred over wireless links. We propose a flexible bio-signal transfer protocol which supports heterogeneous signal types such as electrocardiog...

FAST Transmission Control Protocol (TCP) was previously proposed for high capacity with long delay network environments, and `FAST TCP with Snoop' performs better than conventional TCP enhancements within mobile wireless network environments. However, FAST TCP has limitations when dealing with a dynamic mobile wireless link where high Frame Error R...

The Future Internet Research for Sustainable Testbed (FIRST) is an experimental project in South Korea aimed at creating future internet platforms and investigating innovative ideas on developed platforms. The primary goal of the project is research and development for a media-oriented service overlay network architecture. From 2009 to 2014, dynam...