• Convergence Security Journal
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• v.12 no.3
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• pp.93-97
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• 2012

In this paper, we apply the next generation Internet TV solution, FLV has been designed and implemented. Currently being broadcast in the field to compress HD video in real time, as well as live Internet VOD services are available through the online system, the Internet LIVE broadcast and VOD service easy to operate and UCC services that support the solution. VOD video cameras and in real time using H264 CORECODEC to compress MPEC4, WMV, and real-time video streaming on the Internet, and phone system that supports the first, real-time recording of camera images featured nation's first real-time encoder system (Real time encoder system) is, Web and smart environment suitable for supporting the latest CORECODEC technology and software products. Second, the video can be played in MP4 player and customize your chat, and Custer (customizing) is a possible two-way Internet Broadcasting System. Third, CMS (Contents Management System) feature video content and course management content in real time via the Android phone and iPhone streaming service is available.

• 한국HCI학회:학술대회논문집
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• 2008.02b
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• pp.614-623
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• 2008

본 연구는 사용자 만족 중심의 기존 사용자 경험 관련 연구들이 가지고 있는 한계를 보완하기 위하여 감정적 애착이라는 새로운 개념을 도입함으로써 사용자 경험 연구의 새로운 시각을 제공하고자 하는 목적으로 진행되었다. 이를 의하여 [연구 1]에서는 감정적 애착과 관련된 기존 이론들에 대한 조사를 통하여 사용자들의 디지털 기기에 대한 감정적 애착 형성에 영향을 미칠 수 있는 이론적 경험 요소로서 지각된 자아 일치감과 지각된 사회적 고양감이라는 개념들을 도출하였으며, 이를 기반으로 사용자 경험의 관점에서 새로운 이론적 모형을 개발하고, 한국의 핸드폰 사용자들을 대상으로 한 설문을 통하여 개방된 감정적 애착 형성 모형의 타당성을 실증적으로 검증하였다. 또한 [연구 2]에서는 5 개국 (한국, 미국, 독일, 러시아, 인도)에서 4 개의 디지털 기기 (핸드폰, MP3 플레이어, LCD TV, 냉장고) 사용자들을 대상으로 한 Contextual Interview 를 실시하여 실제 디지털 기기의 개발 및 디자인에 구체적인 시사점을 제공할 수 있는 경험 요소들을 추가적으로 도출하였다. 마지막으로 [연구 3]에서는 [연구 2]를 통하여 도출된 구체적인 사용자 경험 요소들을 [연구 1]에서 개방된 이론적 모형에 반영하여 구체화된 감정적 애착 형성 모형을 개방하고, 구체화된 모형의 타당성을 미국 핸드폰 사용자들을 대상으로 한 설문을 통하여 추가적으로 검증하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.11a
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• pp.959-962
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• 2004

스마트폰(Smartphone)은 휴대 전화(Mobilephone) 기반에 개인용 정보 단말기(PDA: Personal Digital Assistance)의 장점을 합친 고기능, 다기능의 신개념 휴대 정보통신기기이며, 현재 계속하여 데이터 통신 기능은 물론 카메라, MP3 플레이어 기능 등 기존 휴대폰의 영역을 훨씬 넘어 PC의 영역에 범접하는 다양한 디지털 컨버전스가 이루어지고 있다. 이런 이유로 스마트폰 제조사예서는 기존 휴대 전화기에 비해 훨씬 많아진 정보의 양에 비해 상대적으로 좁은 크기의 액정 화면에 다양한 기능을 표시할 수밖에 없게 되었고, 그 결과 최종 사용자들은 화면 구성이 복잡한 스마트폰을 경험하게 되었다. 본 연구의 목적은 기존 스마트폰의 복잡한 기능중심 화면 표시 중에서 특히 아이콘(Icon)의 형태를 사용자 중심(User Oriented)의 아이콘으로 개선하는 방안을 제안하고, 이의 정략적 개선 효과를 검증하는데 있다. 본 연구는 2 단계의 실험 과정을 거쳐 수행되었으며, 첫 번째 실험에서는 스마트폰의 최종 사용자들 대상으로 평면적인 아이콘과 입체적인 아이콘의 정보 전달 효율성을 비교 측정하고, 두 번째 실험에서는 아이콘과 텍스트의 결합 유무에 따른 정보 전달 효율성을 측정하여, 2 단계의 실험 과정을 통해 분석한 아이콘의 최적 형태를 도출하였다. 본 연구에서는 측정한 실험 결과를 통하여 텍스트와 그래픽의 형식이 결합된 입체적인 아이콘의 형태가 최종 사용자를 위한 정보 전달에 있어 가장 효율적인 아이콘 형태임을 알 수 있었다.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06b
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• pp.321-326
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• 2007

최근 휴대전화 디지털 카메라, 랜 스위치, 디지털 셋톱박스, 휴대용 MP3 플레이어, 노트북용 PC 카드, 내장 기기의 펌웨어 등 플래시 메모리의 활용이 증가하고 있다. 하지만 기존 저장 장치와 달리 플래시 메모리는 특정 블록에 쓰기 연산을 하기 전에 해당 블록은 미리 소거(erase-before-write)되어 있어야 하는 제약이 있으며, 각 블록은 소거될 수 있는 횟수가 제한적이다. 이런 단점들은 플래시 메모리가 대용량화됨에 따라 중요한 문제로 대두되고 있다. 이런 각 블록에 대한 소거 횟수의 제한을 해결하기 위하여 소거 횟수 평준화 기법(wear-leveling) 기법이 필수적이다. 본 논문에서는 블록의 소거 횟수의 한계를 극복하기 위한 새로운 소거 횟수 평준화 기법으로 전체 블록에 대한 소거 횟수 레벨을 두어 소거 횟수 평준화를 이루는 KM-평준화(KM-leveling)를 제안한다. KM-평준화는 소거 횟수 평준화를 위한 전체 블록의 계산 비용을 최소화하고 블록에 대한 소거 레벨을 두어 적은 공간을 사용하는 효율적인 기법이다. 본 논문은 M값 범위 이내에 각 블록의 소거 횟수들이 존재하도록 보장하는 KM-평준화를 제안한다.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.43 no.3 s.309
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• pp.76-83
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• 2006

A main objective of audio equalizer is for user to tailor acoustic frequency response to increase sound comfort and example applications of audio equalizer includes large-scale audio system to portable audio such as mobile MP3 player. Up to now, all the audio equalizer requires manual setting to equalize frequency bands to create suitable sound quality for each genre of music. In this paper, we propose an intelligent audio graphic equalizer system that automatically classifies the music genre using music content analysis and then the music sound is boosted with the given frequency gains according to the classified musical genre when playback. In order to reproduce comfort sound, the musical genre is determined based on two-step hierarchical algorithm - coarse-level and fine-level classification. It can prevent annoying sound reproduction due to the sudden change of the equalizer gains at the beginning of the music playback. Each stage of the music classification experiments shows at least 80% of success with complete genre classification and equalizer operation within 2 sec. Simple S/W graphical user interface of 3-band automatic equalizer is implemented using visual C on personal computer.

• Journal of KIISE:Databases
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• v.35 no.3
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• pp.286-295
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• 2008

Multimedia consumer electronics(CE) devices, such as MP3 players, PMPs, and digital cameras, are electronic equipments used to record, play or create multimedia data. Most multimedia CE devices provide uses with the ability to search multimedia stored in the device and browse the search results. One of the unique requirements in multimedia CE devices is that the search results displayed in the screen must be restored quickly when the device powers off and later back on. For this purpose, the existing methods (1) re-execute the original search query, and (2) move the cursor to the original position in the search results. However, this approach may be inefficient when the number of records in the result set is large. In this paper, we propose an efficient method for multimedia CE devices that can quickly restore the search results displayed in the screen when the device powers off and later back on. The proposed method can retrieve the original search results in the screen quickly by saving and loading some information about the query evaluation plan. Though the performance evaluation, we show that the proposed method provides excellent performance regardless of the number of records in tile result set or the original cursor position.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.8
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• pp.3777-3785
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• 2013

This study aimed to find out adolescents' media literacy in terms of reading, writing, and enjoying media or messages. For the purpose, we analyzed the data garnered from 1,036 students enrolled in 5 middle and 5 high schools, respectively. The analyses of the data are summarized as follows: First, mobile phone was most widely used among others, followed by TV, the Internet, mp3 player, computer or video game, radio, a video or DVD in the order. Second, a gender effect was significant in terms of the variety of activities with the Internet, mobile, and SNS: boys were more active in the use of the Internet while girls carried out more activities with a mobile phone and SNS media. Third, high school students showed more critical attitude towards information on the Website than did the middle school students. Fourth, Girls than boys, and high schoolers than middle schoolers, tended to be more active in the production of contents, self-expression, as well as participating in social and political issues online. Fifth, for the enjoyment experiences, time spent for games took up the most of the students' leisure activities, followed by watching TV and the use of the Internet. The findings of the study were discussed in light of media convergence, with implications for developing media literacy education for the youth.

• Journal of KIISE:Computer Systems and Theory
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• v.35 no.11
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• pp.497-508
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• 2008

Mobile Multimedia File System, MNFS, is a file system which extensively exploits NAND FLASH Memory, Since general Flash file systems does not precisely meet the criteria of mobile devices such as MP3 Player, PMP, Digital Camcorder, MNFS is designed to guarantee the optimal performance of FLASH Memory file system. Among many features MNFS provides, there are three distinguishable characteristics. MNFS guarantees, first, constant response time in sequential write requests of the file system, second, fast file system mounting time, and lastly least memory footprint. MNFS implements four schemes to provide such features, Hybrid mapping scheme to map file system metadata and user data, manipulation of user data allocation to fit allocation unit of file data into allocation unit of NAND FLASH Memory, iBAT (in core only Block Allocation Table) to minimize the metadata, and bottom-up representation of directory. Prototype implementation of MNFS was tested and measured its performance on ARM9 processor and 1Gbit NAND FLASH Memory environment. Its performance was compared with YAFFS, NAND FLASH File system, and FAT file system which use FTL. This enables to observe constant request time for sequential write request. It shows 30 times faster mounting time to YAFFS, and reduces 95% of HEAP memory consumption compared to YAFFS.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.12
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• pp.8933-8939
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• 2015

In this paper, we designed a multi humanoid robot control method for performing an exhibition that will maximize the efficiency and user convenience and implementation. In recent years, an increasing number of case and to take advantage of the robots in the field performances and exhibitions, plays, musicals, orchestra performances are also various genres. In concert with the existing small humanoid exhibition to source from outside by using a computer and MP3 player and play, while pressing the start button of communication equipment for the show to start the robot began performing with the zoom. Thus, due to the dual source and robot operation and synchronization does not work well is the synchronization of the start of the concert sound starting point of the robot and robot motion and sound are reproduced separately were frequently occurs when you need to restart the show. In addition, when the center of gravity or lose the robots who were present during the performance problems such as performance or intervene to restart the show. In order to overcome this, in this paper, Multi-small humanoid robot was designed to control the efficiency and the user of the GUI-based human interface S/W to maximize convenience, Zigbee communication to transmit a plurality of data in al small humanoid It was used. In addition, targeting a number of the small humanoid robot demonstrated the effectiveness and validity of the user's convenience by gender actual implementation.

• The Journal of the Acoustical Society of Korea
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• v.23 no.6
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• pp.437-445
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• 2004

In this paper. we describe a novel method for transforming audio contents according to user's preference on sound field. Sound field effect technologies. which transform or simulate acoustic environments as user's preference, are very important for enlarging the reality of acoustic scene. However huge amount of computational power is required to process sound field effect in real time. so it is hard to implement this functionality at the portable audio devices such as MP3 player. In this paper, we propose an efficient method for providing sound field effect to audio contents independent of terminal's computational power through processing this functionality at the server using user's sound field preference, which is transfered from terminal side. To describe sound field preference, user can use perceptual acoustic parameters as well as the URI address of room impulse response signal. In addition, a novel fast convolution method is presented to implement a sound field effect engine as a result of convoluting with a room impulse response signal at the realtime application. and verified to be applicable to real-time applications through experiments. To verify the evidence of benefit of proposed method we performed two subjective listening tests about sound field descrimitive ability and preference on sound field processed sounds. The results showed that the proposed sound field preference can be applicable to the public.