• Journal of the Korea Academia-Industrial cooperation Society
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• v.4 no.4
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• pp.380-386
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• 2003

As Internet is spreaded widely, the virtual communities among people with the same interest and hobby are dynamically created. The exchange of fruitful opinion and information makes them to be closed, not only with the help of the messaging system but also wireless terminals. The messaging system is a core technology supporting the global community services like chatting, messenger, short message services, and file sharing services. The paper focus on the design of software architecture for messaging system and the engineering model for QoS support.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2022.05a
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• pp.589-591
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• 2022

시니어를 위한 메디컬 가상현실 서비스 개발을 목표로 하고 있으며, 시니어가 쉽고 안전하게 체험할 수 있는 가상현실 콘텐츠를 제작하는 것이 주된 목표이다. 본 연구의 최종 목표로는 체험에 집중하기 위한 환경을 조성하기 위해 안전시스템 구축 및 가족/친구와의 연결을 통한 소통 서비스를 개발한다. 시니어를 대상으로 가상현실 체험을 제공할 때 컨트롤러를 쥐고 상호작용을 해야하는 부분을 핸드트래킹 기술을 연구하여 컨트롤러 없이 물리적으로 양손을 자유롭게 하면서 피로감을 줄이는 것은 물론, 주변의 물건을 내려치거나 컨트롤러를 놓쳐 사고로 이어질 소지도 없애 체험에 집중하게 할 수 있는 환경을 제공하고 체험 중 신체에 이상현상이 나타날 경우 즉시 이를 알릴 수 있도록 콘텐츠 내에서 특정 제스쳐나 긴급 버튼을 통하여 체험시 발생할 돌발상황에 대한 대비를 위해 별도의 앱을 개발하고 체험과 상시 연결하여 체험중인 상황을 관제할 수 있도록 시스템을 구축하고, 알림을 통해 조기에 즉각 대처할 수 있도록 한다. 또한, 몸이 불편하거나 요양원 거주등으로 인해 사회적 단절의 해소를 위해 별도의 앱을 통해 체험중인 콘텐츠와 연결이 가능하도록 설계하고 상호간에 아바타를 통한 감정 표현 및 음성 채팅을 할 수 있게 하여 소통을 할 수 있는 서비스 개발하고자 한다.

• Journal of the Korea Society of Computer and Information
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• v.16 no.9
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• pp.87-95
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• 2011

Recently, as smartphones have rapidly come into wide use and various social networking services have grown, people perform a variety of interactions through the virtual and real world based on them. Usually, such services focus on easy formation of social links among users, supporting the exchange of simple messages among users on the networks. Twitter, one of such services used worldwide, supports short message service named Tweet and has over 200 million members signed up. n this paper, we propose techniques for supporting real-time group messaging based on the social network of Twitter and describe a smartphone group messaging system developed with the techniques. The system automatically forms a group that include a Twitter user and the followers of the user, supporting real-time group messaging among the group members. The developed system is composed of an XMPP protocol-based messaging server and smartphone client applications which perform real-time messaging based on the social network of Twitter. Twitter users can easily use the system utilizing Tweet messages, exchanging real-time messages with their followers within the groups instantly established on the XMPP server.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.7
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• pp.1495-1504
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• 2014

Currently information related service such as internet banking, chatting, social network services are quite well smeared into our daily life. Moreover, a rapid growth of service using smart devices brought an importance of security in internet services and a research activation of digital forensic in a crime investigation. This paper presented a previous digital forensic research trend and based on this, suggested a technology-strategy integrated digital forensic process platform, taking a mid-long term government leading ICT R&D strategy and ICT paradigm shift into account.

• Journal of the Korea Computer Industry Society
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• v.2 no.7
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• pp.933-944
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• 2001

In the process of software development, object-oriented framework enables directly improving the productivity of the developer through the reuse of code, analysis and design informations. object-oriented framework is a set of usable and expandable classes and their connectivity. It is a meta solution that contains the code to be reused in the framework and the expert design results on a specific area. This paper constructs the framework that extracts the common services of BBS, chatting, white board and ftp applications for internet-based remote education system. These services can be mostly reused within heterogeneous applications in the form of component.

• Journal of Korea Society of Industrial Information Systems
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• v.6 no.2
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• pp.47-53
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• 2001

Real-time multimedia transmit services like internet broadcasting, web-based education, chatting, conference, circumference observation etc. by using internet are given a great deal of weight on most recently internet services. In these way, various internet services are presented and there applications are also gradually spreaded because of improvement MPEG and streaming processing techniques. But currently internet service is a development of system which has independent function of above services. And a research and development of system which have a multipurpose internet service are insufficiency. In this paper, we design and develop system(RealCam SUN A/V) for transmitting images and voices based on MPEG4 streaming. As a result of our research, it made possible to transmit images with 15 frame/sec in 160×120 frame size at 56Kbps and 30 frame/sec in 640×480 frame size at 512Kbps. And also we can apply this system as multipurpose function to circumference observation and internet broadcasting etc., by transmitting voices, images and control signal simultaneously.

• Journal of Broadcast Engineering
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• v.24 no.4
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• pp.553-563
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• 2019

As the number of videos uploaded on live streaming platforms rapidly increases, the demand for providing highlight videos is increasing to promote viewer experiences. In this paper, we present novel methods for predicting highlights using chat logs and audio data in videos. The proposed models employ bi-directional LSTMs to understand the contextual flow of a video. We also propose to use the features over various time-intervals to understand the mid-to-long term flows. The proposed Our methods are demonstrated on e-Sports and baseball videos collected from personal broadcasting platforms such as Twitch and Kakao TV. The results show that the information from multiple time-intervals is useful in predicting video highlights.

• Journal of the Korea Society of Computer and Information
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• v.14 no.1
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• pp.1-8
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• 2009

Learning user's preference is a key issue in intelligent system such as personalized service. The study on user preference model has adapted simple user preference model, which determines a set of preferred keywords or topic, and weights to each target. In this paper, we recommend multi-perspective user preference model that factors sentiment information in the model. Based on the topicality and sentimental information processed using natural language processing techniques, it learns a user's preference. To handle timc-variant nature of user preference, user preference is calculated by session, short-term and long term. User evaluation is used to validate the effect of user preference teaming and it shows 86.52%, 86.28%, 87.22% of accuracy for topic interest, keyword interest, and keyword favorableness.

• Journal of the Korea Society of Computer and Information
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• v.16 no.1
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• pp.101-115
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• 2011

PECOLE (Peer-to-Peer Collaborative Environment) is a P2P-based multimedia distributed collaborative environment supporting a collaborative workspace which is composed of a variety of collaborative applications such as multi-chat, video conferencing, screen sharing and etc. Unfortunately, due to the PECOLE's simple group management, it is impossible to perform collaboration activities while joining multiple groups. In this paper, we present the design and implementation of PECOLE+ which is an extension of PECOLE. PECOLE+ resolves the drawback of PECOLE by providing the Group Management Service and the Workspace Management Service. The Group Management Service provides functionalities such as creating groups, joining multiple groups, and searching groups, and etc. The Workspace Management Service provides each group with an associated workspace, supporting the execution of collaborative applications over the workspace. In addition, any collaborative applications with the provided plug-in interfaces can be executed over the workspace as a PECOLE+ collaborative application.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.11B
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• pp.969-978
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• 2006

Recently, there has been explosive growth in Internet service contents, and we have witnessed the emergence of many real-time applications on the Internet. These types of applications require special support from the underlying network such as reliability, timeless, and guaranteed delivery, as well as different levels of service quality. Estimation network status and transcoding data rate are researching for QoS of multimedia service by using the RTP/RTCP. We propose two schemes that the way to calculate the one-way delay by expanding the structure of RTP/RTCP in Internet that provides us 'best effort' service and to estimate the network condition by using this in this paper. And we propose the dynamic RTCP mechanism based on one-way delay to deal with rapidly changed network situation immediately. In simulation, proposed monitoring schemes using the one-way delay has similar in performance to monitoring schemes using the GPS, proposed dynamic RTCP scheme obtain the desired result of decreased packet loss rate by sending RTCP RR packet lower than other schemes.