• Proceedings of the Korea Information Processing Society Conference
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• 2006.11a
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• pp.241-244
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• 2006

홈 네트워크 환경은 다양한 기기들이 네트워크로 연결되어 사용되는 환경을 이야기 하고, 특별히 AV 네트워크 활용이라고 하는 기기간 저장된 또는 공유 가능한 오디오 비디오 콘텐츠에 대한 활용이 하나의 가전 네트워크 분야의 중요 부분이 되고 있다. 지금까지 고려되는 다양한 시나리오의 홈 네트워크상의 콘텐츠 활용을 위해서는 기기 또는 콘텐츠 종류에 따르는 고정된 접근 절차에 따라서 콘텐츠에 접근하도록 인터페이스가 개발되어 사용되고 있다. 그러나 홈 네트워크 환경은 기존의 가정내 고정형 정보가전 기기와 모바일 기기가 모두 연결되는 상황으로 기존의 고정형 가정기기들로의 구성과 달리 다양한 사용 경로특성을 가진 기기가 연결되게 된다. 이에 본 연구에서는 이런 상호 동질성을 가지기 어려운 정보기기를 사용해야 한 사용자에게는 사용상의 어려움 줄이는 인터페이스를 제안하고자 한다. 이를 위해 본 연구에서는 가정내 구성원들의 제품 및 콘텐츠 사용 특성을 확인하고, 기기와 콘텐츠 고유의 특성을 고려하여, 다양한 접근 경로를 가지는 홈 / 모바일 기기 사용의 사용경험을 모두 수용하면서 새로운 사용자환경인 홈 네트워크 AV 환경하에 학습이 용이하면서 최소한의 물리적인 인터페이스를 가지는 사용자 인터페이스를 제안한다.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06b
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• pp.458-461
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• 2011

모바일 디바이스 저장 장치로 많이 사용되고 있는 플래시 메모리는 가벼운 무게, 내구성, 낮은 전력 소비 등의 장점을 가지고 사용되기 시작하였으며 근래에는 모바일 뿐 아니라 다양한 멀티 미디어 디바이스 전반의 많은 제품에 채용되어 더욱 더 그 범위가 확산되는 추세에 있다. 플래시 메모리는 위에서 언급한 많은 장점이 있지만 기존에 사용되던 디스크와 달리 플래시 메모리 블록을 재사용하기 위해서는 삭제 후 쓰기라는 별도의 연산을 필요로 한다. 이를 FTL (Flash Translation Layer) 이라는 S/W 모듈을 통해 구현되어 있으며 FTL의 구현 알고리즘에 따라 소용되는 연산 비용 또한 상이하며 그 특성과 성능이 매우 다양하게 나타난다. 일반적으로 리눅스에서 FTL은 커널 내부에 구현되어 디바이스 드라이버 형태로 존재하며 일반적인 S/W 개발자보다는 플래시 및 커널 관련 전문지식을 가진 시스템 개발자가 구현을 하게 된다. 이 논문에서는 커널 및 시스템에 대한 깊은 지식 없이도 새롭게 고안된 FTL 알고리즘을 쉽고 빠르게 구현, 검증할 수 있도록 커널이 아닌 사용자 공간에 FTL을 구현하여 빠른 시간 내에 착안된 알고리즘을 실험, 검증할 수 있는 UFTL(User Space Flash Translation Layer) 개발 플랫폼올 제안한다.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10a
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• pp.559-561
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• 2001

인터넷은 21세기 산업발전의 원동력이며, 인류 역사상 가장 빠른 속도로 확산된 미디어로서 현재 인터넷 비즈니스는 유통은 물론 금융, 주식거래, 경매, 오락, 택배 서비스 등 산업 전반으로 빠르게 확산되고 있다. 빠른 환경변화와 더불어 다양한 인터넷 사업 모델이 계속 새로 등장하고 있으며, 그 중 전자상거래는 더 이상 새로운 기술이 아닌 우리 환경의 필수적인 요소로 자리잡고 있다. 현재 모바일 전자상거래는 시장 형성의 초기 단계로 무선 인터넷 시장의 상황과 수익 창출의 관점에서 볼 때는 무선 인터넷 포탈 서비스의 핵심이 될 것이다. 이러한 요구에 부응하기 위하여 본 논문에서는 전자상거래를 위한 시스템을 UML (Unified Modeling Language)로 설계하여 시스템의 특성에 맞게 사용자가 시스템을 사용할 수 있도록 한다.

• The Journal of the Korea Contents Association
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• v.11 no.6
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• pp.197-204
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• 2011

In line with the development of Media, the use of character has been developed in various ways. Specially, it has been emerged the functions of written language of visualization and delivery of emotion in the digitalized environment due to speedy growth of internet and Mobile. The emoticons emerged as a tool for the convenience of communication proved to have taken effective role in the part of communication culture. Particularly, Hangul emoticons which contains the meaning of communication and sharing in tandem with the principle of Hangul invention, provides convenience in combination & use due to its structural and design characteristic for which it plays a significant role of visual element. Hangul emoticon is definitely a part of Hangul culture and in view of globalization of visual language in connection with media development, there is a huge potential being to be used as a international communication tool. In this study, it will be reviewed on the increased utilization of Hangul emoticons and related public issues as being a part of typography media, in view of the generalization of private media as well as change of subjective user.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.3
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• pp.563-569
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• 2007

As the mobile communication and the semiconductor technology is improved continuously, mobile contents such as the multimedia service and the 2D/3D graphics which require high level graphics are serviced recently. Mobile chips should consume small die area and low power. In this paper, we design a truncated floating-point multiplier that is useful for the 2D/3D vector graphics in mobile devices. The truncated multiplier is based on the radix-4 Booth's encoding algorithm and a truncation algorithm is used to achieve small area and low power. The average percent error of the multiplier is as small as 0.00003% and neglectable for mobile applications. The synthesis result using 0.35um CMOS cell library shows that the number of gates for the truncated multiplier is only 33.8 percent of the conventional radix-4 Booth's multiplier.

• Journal of Broadcast Engineering
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• v.16 no.5
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• pp.693-704
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• 2011

As mobile devices become multi-functional, and converge into a single platform, there is a strong need for a codec that is able to provide consistent quality for speech and music contents. MPEG-D USAC standardization activities started at the 82nd MPEG meeting with a CfP and approved Study on DIS at the 96th MPEG meeting. MPEG-D USAC is converged technology of AMR-WB+ and HE-AAC V2. Specifically, USAC utilizes three core codecs (AAC, ACELP, and TCX) for low frequency regions, SBR for high frequency regions, the MPEG Surround for stereo information, and window transition technology for smoothing transition between various core coder. USAC can provide consistent sound quality for both speech and music contents and can be applied to various applications such as multi-media download to mobile devices, digital radio, mobile TV and audio books.

• Korean journal of communication and information
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• v.74
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• pp.72-108
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• 2015

The more mobile technology evolves, the more users are trapped in mobile technology by being encouraging the replacement with state-of-the-art technology. However, the use of device is not entirely determined by technology's attributes itself. The meaning of smartness can be varied by 'how users accept and perceive immediate spatial perception from reality to mobile space' without recognizing the boundaries between them. This study focuses on the analysis of 'smart usage' for smartphone and this is verified the concept of 'smart usage' by the second-order measurement model. The result show that the concept organization of 'smart usage' had been differentiated and elicited by the six factors - 'multifunctional use readiness', 'administrative efficiency', 'embedded media', 'device connectivity', 'user-friendly optimization', and 'external connectivity(being connected). According to the conceptual factors, 'smart usage' can be explained in an individual's autonomous ability to control a mobile interface and to utilize a wide range of applications of smartphones.

• Journal of Korea Multimedia Society
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• v.15 no.7
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• pp.847-858
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• 2012

In this paper, we propose a mobile watermarking based on the distortion analysis of display-capture image in a smart phone. We compose a random sequence by utilizing the property of frequency band in the wavelet domain. Then we calculate the CCS (Coefficients Comparative Sum) using the block wavelet coefficients of selected subbands after the wavelet transformation and the random sequence and repeatedly embed a watermark using an insertion threshold for the watermark robustness. For correcting a distortion caused by the display-capture process, we adopt a frame at the outside of watermarked image, then we can equate a watermark synchronization by detecting the frame. And we can improve frame detection ratio by using an iteratively adaptive threshold. A proposed scheme embedded information of 206 bits into standard digital images and it shows an average about 41.42 dB in PSNR. In watermark extract experiments, a proposed scheme accurately recognizes the frame more than 97% in total captured images. Also in BER (Bit Error Ratio) of captured images, it shows about 3.73%, then it was improved more than 70%, compared with the Pramila's method.

• Journal of Satellite, Information and Communications
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• v.9 no.2
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• pp.91-95
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• 2014

We could use a social networking service such as data communication, personalized service through smart devices as Tablet computers and smart phones. Because of these characteristics, suitable lectures are provided to mobile device. especially, in Korea Cyber University already had built a lot of infrastructures. But, many mobile devices are used in a small display environment. it could effect on reduce Students' efficiency from taking courses. Therefore, we need effectively in a small display content layout for overcome these problems. In this paper, proposed the platform for Improve learning effect in smartphone education. It studied based on golden section and golden spiral theory. and also, we developed layout for content development using vector method illustration program.

• Smart Media Journal
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• v.4 no.3
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• pp.9-15
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• 2015

A pub(lish)/sub(scribe) system is a data forwarding system which forwards only interesting data among the whole published data, which is related to the subscriptions registered by end users. Classical pub/sub systems are realized by constructing a network of brokers which are responsible for storing or forwarding data. Along with the substantial increase of the population mobile users, it is required that the pub/sub system handles the subscriptions of user locations which changes continuously and frequently. In this paper, a new broker network based pub/sub system which efficiently handles the frequent changes of subscriptions related to user locations is proposed. In consideration of moving patterns of users and geographical property, the proposed pub/sub system categorize the entire data space into Slow Moving Region and Normal Moving Region, and manages the brokers which are responsible for these regions by using Q+R tree in order to handle user requests more efficiently. Through the extensive simulation, it is presented that the proposed Q+R tree based pub/sub system can reduce unnecessary needs of brokers and network traffic and can support the dynamic subscription related to user location.