• International Journal of Contents
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• 제13권1호
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• pp.53-61
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• 2017

Recently, the Social Internet of Things (IoT), the follow-up of the IoT, has been studied to expand the existing IoT services, by integrating devices into the social network of people. In the Social IoT environment, humans, devices and digital contents are connected with social relationships, to guarantee the network navigability and establish levels of trustworthiness. However, this environment handles massive data, including social data of humans (e.g., profile, interest and relationship), profiles of IoT devices, and digital contents. Hence, users and service providers in the Social IoT are exposed to arbitrary data when searching for specific information. A study about the recommender system for the Social IoT environment is therefore needed, to provide the required information only. In this paper, we propose the Social correlation group based Recommender System (SRS). The SRS generates a target group, depending on the social correlation of the service requirement. To generate the target group, we have designed an architecture, and proposed a procedure of the SRS based on features of social interest similarity and principles of the Collaborative Filtering and the Content-based Recommender System. With simulation results of the target scenario, we present the possibility of the SRS to be adapted to various Social IoT services.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2007년도 춘계종합학술대회
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• pp.611-614
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• 2007

본 논문은 PDA(Personal Digital Assistant)와 WLAN(Wireless Local Area Network) 기술을 결합한 TCP-IP 통신 기반의 원격 장치 데이터 모니터링 시스템을 제안한다. 무선의 PDA 디바이스는 서버측에서 전송되는 원격 장치의 데이터인 온도, 습도, 장치 상태 등을 연속적으로 수집하고 모바일 디바이스에 디스플레이 함으로써 무선 통신의 원격 모니터링을 위해서 사용된다. 따라서 유 무선 통합의 원격 장치 데이터 모니터링 시스템을 구축함으로써 관리자의 상황에 적응적인 데이터 수집과 장치 상태 확인의 효율성을 제공한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년 학술대회 논문집 정보 및 제어부문
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• pp.391-393
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• 2006

In this paper, we develop a portable game device with uncompressed HD video and high quality sound output. Portable game devices support not only game function but also various complex functions recently. It especially supports TV-Out port to play realistic game, connecting a large screen display device. But the video and audio output signals of conventional TV-out port have the low performance and these signals are analog output. So, it is difficult that the users enjoy realistic game with benefit of high resolution digital TV. We propose the game device output with uncompressed digital signal, which has no delay of video/audio signal, also has strong immunity to external noise. Since it supports a high resolution video and high quality sound, users can playa realistic game. First, we implement the HDMI to the game device and we test reliability with the various resolutions video inputs and audio inputs. The proposed method can be applied multimedia devices requiring high performance output function as well as portable devices.

• 방송공학회논문지
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• 제14권1호
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• pp.15-27
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• 2009

최근 다양한 휴대용 디지털 매체의 발전으로 시청자들의 멀티미디어 시청 환경이 공간적으로 확대되고 있다. 본 논문에서는 시청자가 VOD 서비스를 이용할 때 한 매체를 통해 시청하다가 이동을 위해 일시중지한 후 다른 매체를 통해 중지된 시점부터 다시 시청할 수 있는 VOD 시스템 제어구조를 제시한다. 그리고 이 제어를 위해 필요한 스트림 동기화 모듈과 시청 로그 기반의 세션 및 자원 관리 시스템을 제안한다. 특히, 시청자와 VOD 시스템간의 비디오 스트림 제어를 위한 세션별 VOD 서비스 연결 관리 시스템을 설계하고 시뮬레이션을 통해 VOD 서비스에서 Seamless 콘텐츠 연결 모델을 제시한다.

• 디지털산업정보학회논문지
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• 제11권1호
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• pp.69-78
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• 2015

Internet of Things(IoT) is electronic devices and household appliances use wireless sensor network in environment of high speed wireless network and LTE mobile service. The combination of the development of Internet and wireless network led to development of new forms of service such as electronic devices and household appliances can connect to the Internet through various sensors and online servers such as a Home Network. Even though Internet of Things is useful, there are problems in Internet of Things. In environment of Internet of Things, information leakage could happens by illegal eavesdropping and spoofing. Also illegal devices of wireless communication interference can cause interfere in Internet of things service, physical damage and denial of service by modulation of data and sensor. In this thesis, it will analyze security threats and security vulnerability in environment of mobile services and smart household appliances, then it will suggest plan. To solve security issues, it is important that IT and RFID sensor related companies realize importance of security environment rather than focus on making profit. It is important to develop the standardized security model that applies to the Internet of Things by security-related packages, standard certification system and strong encrypted authentication.

• 디지털산업정보학회논문지
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• 제12권1호
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• pp.81-87
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• 2016

Cloud computing technologies are utilized and merged in various domains. Cloud computing technology-based personal cloud service technologies provide mobility and free access by using user centered storages and smart devices such like smart phones and table PCs. Therefore, we should overcome limits on the storage by solving the capacity problems of devices to provide security services in the personal cloud environments It can be addressable to provide the convenience of various security technologies. However, there are some security threats inherited from existing cloud environments and the possibilities of information leakage when devices are lost or stolen. Therefore, we designed a framework for providing secure cloud services by adding objects, such as user authorization, access tokens, set permissions by key generation, and key management assignments, for user management in personal cloud environments. We analyzed the stability of the proposed framework in terms of irreverent use and abuse, access to insiders, and data loss or leakage. And we evaluated the proposed framework in terms of the security with access control requirements in personal cloud environments.

• 패션비즈니스
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• 제17권6호
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• pp.88-97
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• 2013

'Smart Clothes', which incorporate topnotch digital technology into fashion, are a leading fashion runner in this digital era. The purpose of the study is to first help develop a practical design for outdoor backpacks which are equipped with eco-friendly solar cells that facilitate recharging diverse smart devices during outdoor activities; and, secondly, to offer some practical data from the actual appropriation tests that will be used for manufacturing such products. This trial study finds out how to conjoin some practical IT devices with fashion items and mainly focusses on designing outdoor backpacks which are loaded with solar cells for recharging electric devices, and, later, experiments on designed backpacks with some smart phones to see how it works. According to the desired purposes of backpacks, all the features can be adjusted and modified such as the kinds of solar cell panels, materials, sizes, positions of attachment, weights, etc. Smart Clothes are highly functional and fashionable items that satisfy both practical and emotional purposes, and are being actively developed to serve consumers. This study proves that Smart Clothes or Smart Wear will have practical uses for outdoor activities and will possibly lead our smart lifestyles.

• 디지털융복합연구
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• 제9권6호
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• pp.217-229
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• 2011

기존의 IT 기기는 강화된 컴퓨팅 기능과 플랫폼 채택, 차세대 네트워킹을 통해 스마트 기기로의 급속한 진화가 이뤄지고 있다. IT 기기의 스마트화에 따른 스마트 기기의 초기 수용단계에서 실증적 연구가 부족한 상황이다. 본 논문에서는 확장된 기술수용모델(TAM)을 기반으로 플로우 개념을 도입하여 스마트기기 사용자들의 이용의도에 관한 실증연구를 수행하였다. 다차원적인 이용자 특성 변인이 플로우와 지각된 유용성, 이용의도에 미치는 영향관계를 살펴본 결과 변인들 간에 긍정적인 영향력이 있다는 결과를 얻었다. 본 논문의 결과에 의하면 스마트 기기시장을 선점하고 싶은 기업은 마케팅 전략 수립이나 콘텐츠를 개발할 때 잠재적 사용자들의 특성을 고려하도록 요구된다.

• 디지털산업정보학회논문지
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• 제9권1호
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• pp.9-23
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• 2013

In recent days, there are many researches of wireless LAN services as the communication environment of wireless LAN are so improved that a lot of services are available in wireless environments. The frequency of the wireless LAN is a general resource that can be used to everyone without any permission. Many technologies using this ISM (Industry Science Medical) frequency band are developed fast and widely. But, as many devices use the same frequency band at th same time, the service quality is degraded and the speed of the service rate id degraded by the result of the interference. For overcome this problem, we must provide the new technology of the mobile devices and a new cell design scheme for obtaining maximum throughput that considering the wireless environments effectively. In this paper, we explain the main technology at the IEEE 802.11n environments and proposes the optimal cell design and reference model for gaining maximum performance to many mobile devices at the same time by investigating real environment testing results.

• 한국정보통신학회논문지
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• 제14권2호
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• pp.437-444
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• 2010

오디오 데이터는 주로 아날로그 방식 또는 간단한 프로토콜을 이용하여 전달되었다. 그러나 디지털 멀티미디어 기기들이 발전함에 따라 하나의 기기 안에 많은 오디오 디바이스들이 집적되었고 이에 따라 연결에 사용되는 개별선들의 개수가 많아져 복잡해졌다. 기존의 $I^2S$, PCM과 같은 오디오 인터페이스는 점대점 방식을 사용하여 디바이스의 연결이 많아질수록 버스 라인의 증가와 전력 소비가 커지게 된다. 본 논문에서는 2선만을 사용한 공통 버스방식의 디지털 오디오 인터페이스를 설계하여 선의 개수를 줄었으며, 또한 전력 소모를 줄일 수 있는 클록 기어라는 방법을 사용하였다. 버스의 전력 소비를 점대점 방식과 비교한 결과 최소 3개 이상의 오디오 디바이스를 사용할 경우 30% 이상의 전력 소모 감소 효과를 갖는다