• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.12
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• pp.2635-2642
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• 2012

MOST(Media Oriented Systems Transport) is a network protocol for vehicle multimedia, where it guarantees large bandwidth and reliability. However, previous MOST device utilized I2C or I2S communication method to data manage or transfer, Bandwidth of MOST have increased and additional equipments are added to one device, requiring a larger form of bandwidth communication method. Therefore, this research suggests of the methods in improving the efficiency of asynchronous data transfer, and suggest an algorithm, which will improve the reliability.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.8 no.2
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• pp.499-508
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• 2004

The Smart Home or intelligent home network control system has the need for home devices to cooperate for the purpose of providing the automated services to residents. The cooperation of home devices can be defined as the service for residents that it controls simultaneously two or more home devices with the same purpose about user's control request of specific home device. A object of home device cooperation are the function object of home device, it is well defined in each device model in AHAM(Association of Home Appliance Manufactures) nth(Connected Home Appliances). AMAM CHA is to promote new appliance services and features enabled through networking by describing generic appliance models, objects, and high-level messages, but does not consider the description and process of cooperation between objects of each device model. This paper defines the cooperation relationship that could be discovered in among home devices, and proposes the cooperation model that AHAM objects could process the cooperation relationship.

• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.244-250
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• 2006

본 논문에서는 촉각지원 네트워크 협업 테스트베드의 구현을 소개한다. 네트워크 촉감 상호작용을 위한 효율적인 실험 환경을 구축하기 위해서는 네트워크 제약 조건들을 정밀하게 조절하는 것이 가능하면서 사용자가 직접 경험을 통해서 현실감의 정도를 느낄 수 있어야 한다. 제안된 촉각지원 네트워크 협업 테스트베드는 본 요구사항을 만족시키기 위하여 두 대의 Phantom Omni 디바이스를 마스터 슬레이브 구조로 연결하고 FreeBSD (dummynet) 기반의 네트워크 에뮬레이터를 포함한다. 본 네트워크 에뮬레이터는 다양한 환경의 네트워크 시나리오를 지원하기때문에 촉감 상호작용의 질과 네트워크 간의 상관성 파악 및 네트워크 제약 보상 기법의 검증에 적용될 수 있다. 본 논문에서는 한 예로써 이를 기반으로 UDP 가 TCP 보다 촉감 상호작용에 더 적합한 프로토콜임을 보이는 실험을 소개하고 현실감있는 촉각지원 네트워크 협업 시스템을 위한 네트워크의 요구 조건을 살펴본다.

• Journal of Korea Multimedia Society
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• v.11 no.2
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• pp.214-227
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• 2008

As cellular network technologies continue to evolve, various network standards coexist in most CDMA-based cellular networks. This means that mobile device users access mobile services over different network bandwidths according to the users' positions or the mobile devices' network access capabilities. Such differences of network bandwidths cause big differences in service response times. To address this problem, we present a framework called CANS (Context-Aware framework for mobile Navigation Services), which takes into account the user's network profile to adapt the contents for CDRG(Centrally Determined Route Guidance) navigation services for cellular phones. To the best of the authors' knowledge, CANS is the first context-aware framework to make mobile navigation services more feasible. The experimental results under commercial CDMA network show that CANS is able to provide similar service response times regardless of type of wireless network to which users connect by adapting the contents to network bandwidths.

• Journal of KIISE:Information Networking
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• v.35 no.6
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• pp.510-520
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• 2008

These days, the network convergence for utilizing heterogeneous network on mobile device is being very actively studied. However, understanding characteristics of physical network interfaces and video encoder is needed for using the network convergence technologies efficiently. Thus, this paper proposes an optimized method for streaming video data through different network paths depending on data characteristics and channel condition. Accordingly, unlike the traditional methods, this study divides scalable coded videos by layer importance, the importance of stream information, and the importance in consideration of video decoder's robustness and selectively sends the data via multiple channels. And the experimental results show over 1dB increment in PSNR. The result of this study will provide an optimized video transmission technique in the next generation network convergence environment in which mobile devices have multiple network interfaces.

• Journal of the Korean Society of Safety
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• v.27 no.1
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• pp.1-6
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• 2012

In crowded subway stations indoor air quality (IAQ) is a key factor for ensuring the safety and health of passengers. Since physical variables that describing IAQ such as the concentration of particulate, $CO_2$, VOCs and biological agents need to be closely monitored and controlled in multiple locations within subway stations and in remote sites, concept of web-based monitoring and control network using both wireless and wired media needs to be implemented. Connecting remote wireless sensor network and device (LonWorks) networks to the IP network based on the concept of VDN can provide a powerful, integrated, distributed monitoring and control performance. In this study, performance of wireless and wired network in VDN for monitoring and control of IAQ in subway stations is evaluated. Specifically, delay induced in wireless and wired networks, and data transmission rate are evaluated. A key parameter is identified in assuring safety and health of passengers in subway stations.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37B no.11
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• pp.965-974
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• 2012

As the use of smart devices has become popular, the number of smart devices connected to network has increased and the amount of traffic from them has grown rapidly. The management of mobile traffic and IP address for smart devices in an enterprise network is crucial problem for efficient operation of network. The information about connection type of a terminal host to the network will be very useful for stable and efficient management of an enterprise network. Also, this information might be used to identify NAT device. In this paper, we propose a methodology to identify the connection type of a terminal host using RTT (Round-Trip-Time) value extracted from captured packets. We prove the feasibility of our proposed method in a target campus network.

• Proceedings of the Korean Information Science Society Conference
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• 2010.11a
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• pp.78-79
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• 2010

• Proceedings of the Korean Information Science Society Conference
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• 2012.06d
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• pp.357-359
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• 2012

본 논문에서는 N-스크린 서비스를 제공하기 위하여 안드로이드 플랫폼 환경에서 유무선 네트워크에 연결된 스마트 디바이스(폰, 패드, 스마트 셋톱박스)를 연동하여 그래픽 UI 전송 기능뿐만 아니라 미디어 변환 기능을 포함한 원격 UI 시스템을 제시한다. 제안된 시스템은 스마트 디바이스를 자동으로 탐색하는 기능, 원격 UI 화면 공유 및 원격 이벤트 처리 기능, 실시간 미디어 변환 전송 기능을 포함한다.

• Proceedings of the Korea Contents Association Conference
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• 2014.11a
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• pp.25-26
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• 2014

스마트폰의 폭 넓은 보급으로 인해 스마트폰 시장은 급격한 성장을 이루었고, 모바일 환경의 발전은 다양한 형태의 애플리케이션의 개발과 모바일 게임 시장의 성장으로 이어졌다. 모바일 게임에서 사용자간 상호작용은 중요한 요소가 되었다. 하지만 대부분의 모바일 게임들은 소셜네트워크상의 초대와 아이템의 제공, 스코어 비교 등에 그치는 등 제한된 영역에서의 상호작용에 그치는 경향이 있다. 이에 본 논문에서는 메시지 서버를 활용하여 다수의 모바일 디바이스를 유기적으로 연계, 모바일 디바이스의 화면이나 기능을 확장하고 게임세계와 현실세계의 접목을 통한 새로운 형태의 게임 가능성에 대해 연구하였다.