• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.238-243
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• 2006

최근에는 통신기술과 인터넷의 발달로 원격의 사람과 전화, 이메일, 메신저 또는 화상회의 시스템 등을 통해서 쉽게 의사소통 할 수 있다. 이 시스템들은 주로 음성, 그림, 동영상 또는 문자 기반의 시청각 정보를 서로 주고 받으며 자신의 의사 및 감정을 전달하는 통로를 제공한다. 그러나 일상 생활에서 시청각 정보 외에 촉감 정보도 서로 의사소통 하는데 중요한 역할을 한다. 악수, 포옹 등의 촉감 상호작용은 사람 사이에서 친근감을 표시하는데 가장 직접적인 방법으로 자신의 감정을 전달하거나 느낌을 표현하는데 사용된다. 그럼에도 불구하고 촉감 상호작용을 가능케 하는 의사소통 시스템의 연구는 아직 폭넓게 진행되고 있지 않다. 본 논문에서는 일상에서와 같이 원격에서도 상대를 바라 볼 수 있고 자연스럽게 접촉할 수 있는 원격 촉감 커뮤니케이션 시스템을 제안한다. 이 시스템에서는 로컬 사용자가 손가락으로 상대의 몸 특정 부위를 만질 수 있고 서로 그 촉감을 실시간으로 느낄 수 있다. 이 시스템은 크게 AR 시스템, 그래픽 시스템, 햅틱 시스템, 택타일 시스템의 부시스템들로 나눌 수 있다. AR 시스템에서는 몸의 한 부위에 사각형의 AR 마커를 부착한 원격 사용자를 웹카메라로 촬영하고 ARToolKit 을 사용하여 마커의 위치를 측정한다. AR 마커의 바로 밑에는 택타일 장치가 장착되어 있으며 이 부위를 통하여 원격의 사용자는 로컬사용자가 자신의 팔을 만지는 느낌을 받게된다. 그래픽 시스템은 로컬사용자에게 촬영된 원격 사용자와 측정된 마커의 위치가 대표하는 원격 사용자의 가상 피부, 그리고 자신의 가상 손가락을 보여준다. 햅틱 시스템에서는 촉감 장치를 사용하여 로컬 사용자의 손가락 위치를 구하여 원격 사용자의 가상 피부와 접촉했을 때 그 충돌을 감지하고 접촉력을 계산하여 촉감 장치에 반영함으로써 그 접촉력을 느낄 수 있도록 한다. 택타일 시스템에서는 원격 사용자의 AR 마커 밑에 장착된 배열 타입의 진동 촉감 장치에 접촉 정보를 주어 로컬 사용자와 접촉 했을 때 접촉 부위에 진동을 줌으로써 촉감을 느끼도록 한다.

• Journal of the Korean Society for information Management
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• v.13 no.2
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• pp.73-96
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• 1996

Since 1995 local newspapers competitively commenced the service of multimedia electronic newspaper on Internet WWW due to the technical development in data processing and the widely used Internet. It includes image, phonetics and moving pictures as well as texts. The Internet service of newspaper articles are not only the information source which enables the users utilize the various information easily and rapidly but also to be an important reference service tools in the library. Howeverjn many cases. the current local electronic newspaper service aims at the service itself. Therefore, the information does not contain plenty of information. In some cases, information searching system focused on the users are not established yet. In this research, structuring process and characteristics of the Internet WWW electronic newspaper and the current service status and contents of the local newspaper have been reviewed. Construction of menu, information searching system and reference mannual for users of 6 local newspapers have been analyzed to secure efficient service for users.

• Journal of the Korea Convergence Society
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• v.2 no.1
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• pp.7-13
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• 2011

Informations of multimedia centering in the images, are combined acoustic and letter, etc. Although the network advances and the capacity of the storage media extends, these huge informations will not be able to accommodate. From meaning which is like this, International standards for the compression and a multiplexing of image, acoustic and voice H261 where admits standard, JPEG, JBIG, MPEG-l, MPEG-2, MPEG-4 and H263, G series etc, are core techniques of multimedia. At initial step of the base technique which creates the base of like this multimedia service time, we developed the real-time MPEG-4 transmission systems to provides real-time MPEG-4 multimedia services. This system means becomes the base technique which hereafter is developed and is applied various system. This system Will be able to apply from a videoconference, a building protection system and a VOD video system to use the Internet. And, They, the image sensing, embedded linux, and MPEG4 software, will become sourceful technique to develop the different system.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.23 no.6
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• pp.1157-1167
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• 2013

The development of electronic devices has recently led to many problems such as personal information rape and leakage of business information. Conventional loud-speakers have been generally used to output devices. It can be, however, operated as a micro-phone which was abused as a means for eavesdropping since the speaker and microphone have basically the equivalent structure. Most importantly, the general peoples are not aware of the approaching danger about using speaker as microphone. And, traditional eavesdropping detection equipment does not check the attack. In this paper, we demonstrate that there is a serious danger and vulnerability in using loud-speakers since they can be used as eavesdropping devices.

• Information and Communications Magazine
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• v.23 no.8
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• pp.35-42
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• 2006

최근 광대역 서비스에 대한 소비자들의 욕구가 차츰 증가하고 있고 대상콘텐츠도 데이터와 음성 및 비디오까지 포함된 멀티미디어 서비스로 변화함에 따라, 통신서비스 제공업체들은 이에 대한 해결책을 찾는 것이 지상과제가 되었다. xDSL, 케이블 모뎀, 광랜 등 엑세스 네트워크가 잘 발달되어 있는 국내에서도 멀티미디어 서비스의 최종 수신 장치가 될 TV, PC, 오디오 기기 및 전화기 등에까지 네트워크를 연결하기 위해서는 댁내에서 또 다른 홈 네트워크를 구성해야 하는 상황이다. 이러한 홈 네트워크를 가능하게 하는 기술로는 홈 RF, 무선랜, 블루투스 등 무선 홈 네트워크 기술과 IEEE1394, 이더넷, 홈 PNA, 전력선통신과 같은 유선 홈 네트워크 기술로 나눌 수 있다. 무선 홈 네트워르 기술의 경우, 댁내에서의 반사와 감쇄 등의 영향에 의한 음영지역이 존재하는 단점이 있고 또 RF단을 구현해야 하므로 시스템 가격이 올라가게 된다. IEEE1394, 이더넷, 홈 PNA 같은 유선 홈 네트워크기술의 경우에는 댁내 통신을 위해 새로운 선을 포설해야 하는데 이를 위해서는 막대한 시설 투자비가 들어가게 된다. 이 막대한 투자비는 홈 네트워크 구축에 많은 시간이 걸리게 하는 요인이 될 뿐만 아니라, 일반 사용자들이 서비스를 이용하기에는 가격적으로 부담스럽게 된다. 전력선통신 (PLC: Power Line Communication) 은 전기를 공급하는 전력선에 흐르고 있는 상용주파수 50/60Hz의 저주파 전력신호에 고주파 신호를 활용하여 데이터를 실어 나르는 통신기술이다. 집안 곳곳 이미 포설되어 있는 전력선이 이미 하나의 네트워크를 구성하고 있기 때문에 번거롭고 값비싼 추가 배선작업 없이 바로 네트워킹이 가능하다. 이와 같은 이유로 고속 PLC는 설치 용이성, 접근성, 속도 및 비용부분 등에서 경쟁기술에 비하여 여러 장점을 가지고 있다. 젤라인은 국내 전력선통신 표준을 만족하는 24Mbps 고속 전력선통신 칩을 기반으로 다양한 전력선 채널환경 하에서 최적의 통신을 보장하는 전력선 통신시스템을 제공하고 있으며, 이를 소개하고자 한다.

• Composites Research
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• v.15 no.6
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• pp.16-23
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• 2002

In this work, the effect of anodic oxidation on surface characteristics of high strength PAN-based carbon fibers was investigated in mechanical interfacial properties of composites. The surface properties of the carbon fibers were determined by acid-base values, scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), and contact angles. And their mechanical interfacial properties of the composites were studied in interlaminar shear strength (ILSS) and critical stress intensity factor ($K_{IC}$). As a result, the acidity or the $O_{ls}/C_{ls}$ ratio of carbon fiber surfaces was increased, due to the development of the oxygen functional groups. Consequently, the anodic oxidation led to an increase in surface free energy of the carbon fibers, mainly due to the increase of its specific (or polar) component. The mechanical interfacial properties of the composites, including ILSS and $K_{IC}$, had been improved in the anodic oxidation on fibers. These results were explained that good wetting played an important role in improving the degree of adhesion at interfaces between fibers and epoxy resin matrix.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.5
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• pp.41-46
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• 2011

Mobile Ad-Hoc networks (MANET) has been getting the spotlight in the area of the wireless networks because of its flexibility and salability, and developing of many applications with it. As a consequence, MANETs are required to process not only simple data traffics, but also multimedia traffics, which has some constraints on the performances. However, unlike wired-networks, the wireless networks have frequent route-disconnections due to some reasons such as channel errors and mobility. Such frequent link disconnections makes the delivery of multimedia traffics difficult. Even though there many researches on multimedia transmissions on various environments, the performances of multimedia transmissions over fading channel and mobility even using various routing protocols have not been evaluated. Therefore, this paper extensively simulates the MPEG-4 video transmission over fading channel environment with node's mobility. In addition, the performances with two routing protocols such as AODV and DSR are compared. Finally, the simulation results shows that DSR protocol has the better performances to deliver MPEG-4 traffic.

• Journal of Korea Multimedia Society
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• v.8 no.9
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• pp.1227-1238
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• 2005

Recently, with the advance of network and internet technologies, it is appeared the Problem that the digital contents such as image, voice and video are illegally pirated and distributed. To protect the copyright of the digital contents, the digital watermarking technology of inserting the provider's information into the contents has been widely used. In this paper, we propose the method of applying the digital watermarking into biometric information such as fingerprint and iris in order to prevent the problem caused by steal and misuse. For that, we propose the method of inserting watermark in frequency domain, compare the recognition performance before and aster watermark inserting. Also, we experiment the robustness of proposed method against blurring attack, which is conventionally taken on biometrics data. Experimental results show that our proposed method can be used for protecting iris and fingerprint data, efficiently.

• Journal of The Korean Association of Information Education
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• v.8 no.2
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• pp.191-201
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• 2004

In accordance with wide spread of personal computer and the expansion of network access, the use of internet has been popular and communication by text message is much more normal than that of voice and image. Accordingly, the side effect of communication language brings about gap between diverse social class, the isolation of communication between generations, abusive expressions, obstacles of juvenile mental development and so on. It appears by the form of slang and vulgar word and has a negative effect on education of mother tongue and usage of children's real language. To deal with these problems, we developed new web-based education system through the analysis of learners' requirement; "Barun Mal, Goeun Mal class". So we verified its efficiency to apply to real class. We also found that this system increased the learners' interest and educational effectiveness. Also, this system contributed to the proper use of language.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.557-560
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• 2013

MANTET(Mobile Ad-Hoc Networks), which is configured and operated by each terminals with no support of communication infra-structures, is recently expanded its application fields from terrestrial communications to underwater environments with technical advances of Wi/Fi and minimized portable terminals. Underwater sensor network, undersea environment explorations and probes, information transmission for underwater area, etc., is typical application fields of underwater MANET. Especially, Performance measurement and analysis on this application fields is one of important research area and base of design, implementation and operation for underwater MANET. However, the research results are focued on various transmission parameters on network level, and its objects of analysis are also performance of network level. In this paper, transmission performances for application levels are measured and analyzed for user levels on underwater MANET. In this study, voice traffic is assumed as object application traffic, computer simulation which is based on NS-2 having additional implemented functions for underwater communications is used. on some defined scale of MANET, transmission performances according to varying traffic environments are measured and analyzed, operation conditions on underwater MANET is suggested with the analysis.