• Proceedings of the Korea Information Processing Society Conference
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• 2013.11a
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• pp.857-860
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• 2013

스마트폰의 다양하고 편리한 기능은 휴대전화기 시장의 급속한 성장을 이루어 최근에는 3000만 사용자 수를 넘어서고 있지만, 악성코드와 같은 공격으로 인한 보안 사고 또한 증가하고 있다. 개방성을 지향하는 안드로이드 플랫폼에서는 스미싱과 같은 신종 공격으로 인해 보안 사고가 최근 크게 이슈가 되고 있는 상황이다. 이러한 취약성을 보완하기 위해 기존 스마트폰 운영체제와 별도의 도메인을 분리하여 금융거래나 사용자의 중요 정보는 별도의 보안 운영체제에서 처리하는 모바일 가상화 기술이 대두되고 있다. 향후 이러한 모바일 가상화 기술이 대중화될 경우, 일반적인 포렌식 조사 절차로는 현장에서 확보한 스마트폰의 보안 영역에서는 사건 조사에 필요한 증거 수집이 불가능할 수 있다. 따라서 본 논문에서는 최근의 모바일 가상화 기술을 살펴보고, 이를 바탕으로 가상화 플랫폼 기반 모바일 장비의 포렌식 조사 방안에 대해 살펴보고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.05a
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• pp.117-120
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• 2013

스마트폰의 보급으로 모바일 소셜 네트워크 게임(SNG: Social Network Game)을 즐기는 사용자들이 증가하고 있다. 그러나, SNG의 특성에 맞는 자원 활용률을 고려한 효율적인 게임서버에 대한 연구는 매우 부족한 실정이다. 본 논문은 가상화 기반으로 SNG게임서버를 설계 및 구현한다. 또한 가상화 기반 분산 게임서버의 CPU 사용률과 Memory 사용량을 분석하여 게임서버의 자원 활용률을 보인다. 이를 토대로 SNG게임서버 환경구축의 기반지식을 제공한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.11a
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• pp.1728-1731
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• 2010

가상화는 서버통합을 통하여 가상머신 간의 하드웨어 자원을 공유함으로써, 총 소유 비용을 줄일 수 있어서 널리 사용되고 있다. 하지만 메모리는 다른 장치와 달리 쉽게 공유되기 어려워서 서버 통합에 있어서 병목이 되고 있다. 이를 해결하기 위한 여러가지 방법들중 많은 방법이 공통적으로 가상머신모니터에서 페이징을 사용하고 있다. 하지만 게스트 운영체제와 가상머신모니터가 모두 페이징을 할 경우, 페이징이 급격히 증가가는 이중 페이징 문제가 발생할 수 있다. 본 논문에서는 이중 페이징 문제를 해결하기 위한 방법으로 가상머신모니터와 게스트 운영체제가 스왑 장치를 공유하는 가상화 지원 스왑 장치를 제안한다. 또한 실험을 통하여 가상머신모니터가 페이지 교환 알고리즘으로 LRU 를 사용할 경우 이중 페이징 문제가 크게 발생할 수 있음을 보인다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.5-6
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• 2009

본 논문에서는 모바일 운영체제 또는 무선인터넷 플랫폼에 대한 독립성을 제공하는 가상화 기반의 모바일 시뮬레이터의 설계 및 구현에 대해 기술한다. 모바일 시뮬레이터는 단말에 최종 탑재되는 전체 SW 스택을 실제 단말 없이 데스크 탑 상에서 시험할 수 있는 환경을 제공한다. 그리고, 컨텐츠와 플랫폼의 안정성 테스트를 지원하기 위하여 사용자의 개입 없이 시뮬레이터에 의해 재현하는 이벤트 기반의 자동화 테스트를 지원한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.2
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• pp.87-92
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• 2014

Smartphones, as well as providing a number of convenience features such as an individual's personality to express the range is gradually increasing. Changed when we met another person, such as a change of outward change in the smartphone became responsive individuals. Each other, it is common to observe smartphones smartphones. Smartphone now due to the common use of information leakage has become a serious problem. In this paper, when sharing smart phone, smartphones to separate the user's area, and the constraints of privacy and the need to apply encryption to prevent information leakage or add application-specific information is encrypted and stored in other similar applications it is not accessible to protect the personal information was through this smartphone to share your private information even improved.

• Journal of Digital Convergence
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• v.14 no.2
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• pp.235-243
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• 2016

Legacy data centers are transforming toward cloud data centers according to the advance of mobile and Internet of Things technology, processing of big data, and development of cloud computing technology. The goal of cloud data centers is to efficiently manage energy and facility, and to rapidly provide service demands to users by operating virtualized ICT(Information and Communication Technology) resources. Accordingly, it requires to configure and operate networks for efficiently providing virtualized ICT resources. This paper analyzes networking technologies suitable for cloud data centers and presents ways to efficiently operate the data center.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.10
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• pp.2462-2472
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• 2014

Recently, the computing paradigm has been changing and VoIP technology is being revisited to support various services. In this paper, we have designed and implemented the system of software PBX open source Asterisk, hardware platform, and mobile devices to support secured voice service based on VoIP. Specially, we designed the various platform from single board to servers based on XenServer in hardware platform. And we verified the delay test of network traffics and the secured voice communication test based on this platform.

• Journal of Information Technology Services
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• v.8 no.1
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• pp.193-202
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• 2009

Cloud computing emerges as a new computing paradigm which targets reliable and customizable services. The term builds on decades of research in virtual machine, distributed and parallel computing, utility computing, and more recently networking, web service, and software as a service. In this paper, we provide a seamless connection migration of web services. This is useful for cloud computing environment in which many client terminals have mobility. With the wireless internet facility, those mobile users can move place to place during internet communication. Therefore, we provide solutions to the two major problems in current virtualization based migration: communication failure problems and connection re-establishment. Communication channel flushing by zero window notification helps to resolve the communication failure problems and TCP port inheritance prevents connection re-establishment errors during socket reconstruction. Thus, our web service migration facility is now able to preserve open network connections, and even for server sockets. This is a highly transparent approach, in that we did not Introduce additional messages for channel flushing and did not make any modification to the TCP protocol stack. Experimental results show that the overhead due to connection migration of web services is almost negligible when compared with time to take the conventional web service migration.

• Journal of Information Processing Systems
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• v.17 no.3
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• pp.489-504
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• 2021

By distributing computing tasks among devices at the edge of networks, edge computing uses virtualization, distributed computing and parallel computing technologies to enable users dynamically obtain computing power, storage space and other services as needed. Applying edge computing architectures to Internet of Vehicles can effectively alleviate the contradiction among the large amount of computing, low delayed vehicle applications, and the limited and uneven resource distribution of vehicles. In this paper, a predictive offloading strategy based on the MEC load state is proposed, which not only considers reducing the delay of calculation results by the RSU multi-hop backhaul, but also reduces the queuing time of tasks at MEC servers. Firstly, the delay factor and the energy consumption factor are introduced according to the characteristics of tasks, and the cost of local execution and offloading to MEC servers for execution are defined. Then, from the perspective of vehicles, the delay preference factor and the energy consumption preference factor are introduced to define the cost of executing a computing task for another computing task. Furthermore, a mathematical optimization model for minimizing the power overhead is constructed with the constraints of time delay and power consumption. Additionally, the simulated annealing algorithm is utilized to solve the optimization model. The simulation results show that this strategy can effectively reduce the system power consumption by shortening the task execution delay. Finally, we can choose whether to offload computing tasks to MEC server for execution according to the size of two costs. This strategy not only meets the requirements of time delay and energy consumption, but also ensures the lowest cost.

• Journal of the Korea Society of Computer and Information
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• v.27 no.8
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• pp.85-90
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• 2022

In this study, to reduce the time and cost disadvantages of the traditional motion graphic production method in order to realize the movement of a virtual camera identical to that of the real camera, motion graphics virtualization using AR Core-based mobile device real-time tracking data A method for creating a camera is proposed. The proposed method is a method that simplifies the tracking operation in the video file stored after shooting, and simultaneously proceeds with shooting on an AR Core-based mobile device to determine whether or not tracking is successful in the shooting stage. As a result of the experiment, there was no difference in the motion graphic result image compared to the conventional method, but the time of 6 minutes and 10 seconds was consumed based on the 300frame image, whereas the proposed method has very high time efficiency because this step can be omitted. At a time when interest in image production using virtual augmented reality and various studies are underway, this study will be utilized in virtual camera creation and match moving.