• Proceedings of the Korean Information Science Society Conference
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• 2004.04b
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• pp.769-771
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• 2004

요즘 Web-Browsing, 영상 데이터 베이스 그리고 원격 진료와 같은 여러 응용 분야에서는 압축할 이미지내의 사용자의 관심 영역을 다른 영역보다 더 우선적으로 처리할 필요가 있다. 즉, 영상을 전송하는데 있어서 관심영역(ROI ： Region Of Interest)을 먼저 전송하고, 영상 복원 시에도 영상의 전체 영역 중 ROI 영역이 우선적으로 복원하여야 하는 경우가 있다. Maxshift 방법은 JPEG2000 ROI Coding 에서 표준으로 사용하고 있다. 그러나 Maxshift 방법은 단지 하나의 ROI 영역만을 처리 가능하다. 본 논문에서는 기존의 방법을 이용하여 우선 순위를 가지는 Multiple ROI Coding 기법을 제안한다. 제안한 방법에서는 계수값들의 비트 플레인에 대한 스케일링 변수를 이용하여 우선 순위를 가지는 Multiple ROI 부호화가 가능함을 보이고, 저 비트율에서 Maxshift 방법보다 좀 더 우수한 성능을 확인하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06c
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• pp.283-285
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• 2012

2009년 7.7 DDoS 공격을 기점으로 DDOS 공격에 HTTP-GET 프로토콜이 공격에 주로 사용되고 있다. 본 논문에서는 클라이언트에서 개인사용자의 웹 브라우징 패턴을 분석함으로써 HTTP-GET 공격을 탐지하는 방법을 제안한다. 웹 브라우징 패턴 분석에는 Markov Model을 사용하여 사용자의 정상적인 행동패턴을 계산하고, 공격을 탐지하는데 사용한다. 제안한 방법은 클라이언트에서 개인사용자에 대한 개별적인 웹 브라우징 패턴을 분석하기 때문에 서버에서보다 계산량이 적으며, 클라이언트 레벨에서 DDoS 공격을 조기에 탐지/차단함으로써 서버에서의 DDoS 공격 탐지에 의한 부하를 줄일 수 있다.

• Journal of the Institute of Electronics and Information Engineers
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• v.52 no.11
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• pp.20-26
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• 2015

Internet censorship-circumvention and anonymizing services are becoming important with an increase in Internet population. Existing circumvention/anonymizing systems, however, have their own limitations, and they mainly suffer from the shortage of volunteers who relay others' traffic to bypass censors. In this paper, we present a new way of achieving censorship-circumvention while guaranteeing anonymity through the cooperation between censored and uncensored users.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.05a
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• pp.1097-1099
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• 2013

위성통신 웹 서비스는 선박의 환경에서 문제되는 부분이 있다. 위성통신의 특성상 요금이 비싸고 통신속도가 느려서 필요한 업무 이외에는 개인적으로 사용되고 있지 않다. 그리고, 통신 요금은 사용한 데이터 량으로 과금이 되는 방식이다. 따라서, 일반적인 웹 브라우징 서비스를 사용할 때 고화질의 이미지, 동영상 등 웹 상의 콘텐츠로 많은 통신 요금을 지불해야 하는 문제가 있다. 이를 해결하기 위해 웹 서비스를 처리하는데 있어 차단, 압축기능을 추가한다면 선박에서 일반적인 웹 브라우징 서비스처럼 고화질의 이미지, 동영상 등의 콘텐츠를 서비스를 지원하기 어렵지만 차단, 압축기능의 효과로 통신비용을 기존의 웹 브라우징 서비스를 사용할 때 보다 줄일 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.30-32
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• 2011

현재 컴퓨터 시스템에서 대표적인 성능 저하가 발생되는 부분은 블록 I/O 시스템이다. 안드로이드와 같은 모바일 장치 또한 위와 같은 성능 이슈를 가지고 있다. 본 논문에서는 리눅스 블록 레이어의 I/O를 tracing 해주는 blktrace를 안드로이드 장치에 적용하여 SQLite를 사용하는 Web Browsing 시의 I/O 패턴 분석과 성능 개선 방안을 제시 한다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.19 no.6
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• pp.121-134
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• 2009

Consumer-centric marketing business is surely one of the most successful emerging business but it poses a threat to personal privacy. Between the service provider and the user there are many contrary issues to each other. The enterprise asserts that to abuse the privacy data which is anonymous there is not a problem. The individual only will not be able to willingly submit the problem which is latent. Web traffic analysis technology itself doesn't create issues, but this technology when used on data of personal nature might cause concerns. The most criticized ethical issue involving web traffic analysis is the invasion of privacy. So we need to inspect how many and what kind of personal informations being used and if there is any illegal treatment of personal information. In this paper, we inspect the operation of consumer-centric marketing tools such as web log analysis solutions and data gathering services with web browser toolbar. Also we inspect Microsoft explorer-based toolbar application which records and analyzes personal web browsing pattern through reverse engineering technology. Finally, this identified and explored security and privacy requirement issues to develop more reliable solutions. This study is very important for the balanced development with personal privacy protection and web traffic analysis industry.

• Journal of Korean Society of Archives and Records Management
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• v.20 no.4
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• pp.107-128
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• 2020

In recent years, many users preferred video records, and as the broadcasting video data becomes necessary, the demand for video records' use has increased. However, most broadcasters' archive agencies currently provide archive services only for internal employees, and for the general public. In this study, the web-based online information services provided to the general public in the archive sites of domestic and foreign public broadcasting companies were examined and analyzed. The evaluation criteria for the web-based records information services were identified in three service areas: online accessibility, search and online browsing, and outreach or expansion services. The overseas public broadcasters' web-based services and the public broadcasting companies' current status were examined for each area. Based on the examination, direction improvements, such as providing online search and records, developing various outreach services, and expanding user levels were proposed for the information services on broadcasting video data in public broadcasting companies for the general public.

• Journal of the Ergonomics Society of Korea
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• v.27 no.4
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• pp.15-26
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• 2008

Recently, Internet Protocol TV technology has a latent power for searching information by using internet-connected interactive TV media. It is hard to browse and search web site conveniently since the visual and input devices are not sufficient for navigating through the websites. Zoomable user interface is a possible solution that may reduce users' task load and improve their performance. In this paper, we made three types of web browsers as scroll, physical zooming and semantic zooming type. Fifteen participants asked to do searching tasks and their task time, accuracy and subjective responses are recorded. In the result, though scroll type is evaluated more efficient than other types in task time and accuracy since participants are familiar with scroll type interface, semantic zooming type is highly rated in subjective responses such as perceived searching efficiency, satisfaction and joyfulness. This result implied semantic zooming is a possible solution which is improving user experience of searching websites using Internet Protocol TV.

• Journal of Korea Multimedia Society
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• v.6 no.2
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• pp.340-351
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• 2003

We introduce our experiences of the design and implementation of the Page Together system that has expanded hyperlink metaphor to utilize human resources in the web. This system supports that a user connects with others in the web, communicates through video/audio channel, navigates same web pages simultaneously and cooperates some work on Internet. For these functions, it comprises Collaborative Browsing Module (CBM), Multimedia Conferencing Module(MCM) Data Conferencing Module(I)CM) and Multi Protocol Interface(MPI). We adopted three standard protocols, IEC, H.323 and T.120 for each nodule and it allows developers to use them easily. We also defined MPI to synchronize information of session among modules. Each module exchanges information each other in session creating process and session terminating process. After a session is created once, each module works independently as its won protocol. Interferences among modules are reduced as minimizing to exchange information. We also introduce a web site that provides web board service based on the Page Together system. A user may post a notice with a link to himself/herself on our web board. After then, if someone read that notice and has any question about it, he or she can try to connect to the writer as clicking the link in that notice and communicate each other. This service site shows that our system can be applied to diverse internet services such as distance teaming and distance conference.

• The Journal of the Korea Contents Association
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• v.11 no.5
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• pp.148-156
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• 2011

Recently, an introduction of the cloud computing causes rapid changes in every aspect of the internet environments including hardware, operating systems, applications, and their services. As the cloud computing environment based on SaaS are being developed to a form in which web platform technology and web cloud services are converged. The digital library system also has been being developed to a service model optimized to SaaS based cloud computing environment, which are different from ASP technology. From the web interface point of view, user customization of the SaaS based cloud computing environment is the most important fact. Therefore, this research work suggests a customized web interface considering usability and accessibility so that enterprises and individual users can be able to do an effortless internet browsing under the cloud computing environment. For this purpose, usability tests were carried out as the user customized web interface design were developed and applied to the LinkSaaS website. This paper work lastly presents an UI environment on which customized interface design for individual users can be formulated.