• Annual Conference of KIPS
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• 2012.11a
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• pp.1710-1712
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• 2012

최근 Twitter를 비롯한 소셜 네트워크 서비스의 급속한 확산으로 인해, 많은 수의 SNS 메시지가 실시간으로 생성되고 있다. 이러한 SNS상에서의 단문 글들을 실시간으로 분석하여 최신의 트렌드를 추출해 낼 수 있다면, 사용자에게 유용한 정보를 제공하는 것이 가능하다. 본 논문에서는 다량의 Tweet글들에 대한 실시간 분석을 바탕으로 트렌드를 추출하고 연관된 키워드를 제공하는 기법을 제안한다. 제안하는 기법은 실시간으로 생성되는 Tweet내에서 영어의 언어적 특성을 활용하여 최근 이슈화된 트렌드 키워드를 추출해낸다. 또한, Tweet 내에서 각 트렌드 키워드간 관계를 분석하여 연관 키워드를 제공하며, 동시에 Wikipedia와 Google에서의 검색을 통하여 다른 형태의 연관 키워드도 추출한다. 이 모든 과정은 제안된 트렌드 추출 알고리즘을 통해 실시간으로 제공된다. 제안된 기법을 바탕으로 시스템을 구현하고 다양한 실험을 통하여 키워드의 유효성 및 처리 속도 면에서 시스템의 성능을 평가한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2020.07a
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• pp.483-484
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• 2020

Cell Broadcast Service (CBS)는 제어 채널을 사용하는 셀 지정 단문 방송형 서비스이며 다수의 사람들에게 일정 크기의 문자정보를 특정 서비스 영역으로 전송하는 서비스 방식을 의미한다. CBS를 이용하면 특정 정보를 빠르고 저렴하게 전달할 수 있기때문에 광고나 정보 서비스에 활용될 수 있으나 국내에서는 재난정보 전달을 위한 수단으로 이용되고 있다. 본 논문에서는 4G 및 5G 망에서 CBS를 이용하여 재난정보를 전송하기 위해 사용되는 시스템 파라미터 및 변경점에 대해 살펴본다. 또한, 한국과 미국에서 재난정보 구분을 위해 사용하는 메시지 식별자의 비교를 통해 긴급재난문자의 문제점을 분석한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.05a
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• pp.667-671
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• 2001

The Instant Messenger(IM) is the most popular personal communication tool today. IM is a tool that can substitute E-mail for a person, and can secure the user for a company. Further, it is claimed as it has a limitless potential. However, there has been several reports on security issues. It has known that the transmitting message is not secured for the attacks, and hacking tools has been developed. In addition, several reports has been made regards to the vulnerability. In other words, anyone can been through and manipulate the messages that are sent or received via IM. This is a barrier for the IM to be developed as a corporate's strategic tool, and furthermore, it will create serious personal privacy issue. IETF IMPP Working Group is preparing a standard mutual relationship between IM. However, it is complicated due to the American On-Lines's absence, whom has ensured the most number of IM users. There was a discussion only about the form of the transmitting data, but it is insufficient state to discuss the security service for general. In this paper, I design and implement the Secure Instant Messaging System, to solve the IM's vulnerability and the security issue presented above.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.2
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• pp.357-364
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• 2001

The Instant Messenger(IM) is the most popular personal communication tool today. IM is a tool that can substitute E-mail for a person, and can secure the user for a company. Further, it is claimed as it has a limitless potential. However, there has been several reports on security issues. It has known that the transmitting message is not secured for the attacks, and hacking tools has been developed. In addition, several reports has been made regards to the vulnerability. In other words, anyone can peep through and manipulate the messages that are sent or received via IM. This is a barrier for the IM to be developed as a corporate's strategic tool, and furthermore, it will create serious personal privacy issue. IETF IMPP Working (:roup is preparing a standard mutual relationship between IM. However, it is complicated due to the American On-Lines's absence, whom has ensured the most number of IM users. There was a discussion only about the form of the transmitting data, but it is insufficient state to discuss the security service for general. In this paper, 1 design and implement the Secure Instant Messaging System, to solve the IM's vulnerability and the security issue presented above.

• Journal of the Korea Convergence Society
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• v.9 no.4
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• pp.23-29
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• 2018

To reduce the accident rate caused by the delay of corrective action, which is common in the construction site, in order to shorten the time from correcting the existing system to the corrective action, I used a time similarity check to inform the inspectors of the problem in real time, modeling the system so that corrective action can be performed immediately on site, and studied a system that can actively cope with safety accidents. The research result shows that there is more than 90% opening effect and more than 60% safety accident reduction rate. I will continue to study more effective system combining voice recognition and deep learning based on this system.

• Journal of Advanced Navigation Technology
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• v.15 no.6
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• pp.939-945
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• 2011

We show a new scheme and implementation of maritime data communication systems for GMDSS ship which performs e-Navigation and removes the functional limitation of those systems through comparing to service fee, call processing reliability, and bit rates of all of those systems within communication range at sea. We confirmed available each frequency band communication and application services at sea by experimental result with proposed new system, MF/HF band being useful to a short text message service, VHF band to 9600bps email service, Fleet Broadband Maritime Satellite system to one or more Mbps multimedia service each.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.8
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• pp.1714-1725
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• 2003

In this paper we propose reliable billing schemes between users and contents providers where a user is provided value­added service for a paid contents using mobile terminals. Our schemes support various types of services such as short messages, bell sounds, images or music data transmissions, and games in mobile communication environments. Using hash chain method, we also reduced the computational overhead of mobile terminals and the volume of data transmitted between the user and the content provider. Content providers can save memory space because they don't need to store each user's usage evidence but still can charge.

• Annual Conference of KIPS
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• 2013.11a
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• pp.1096-1097
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• 2013

최근 Twitter를 비롯한 소셜 네트워크 서비스의 급속한 확산으로 인해, 많은 수의 SNS 메시지가 실시간으로 생성되고 있다. 이러한 SNS 상의 모든 글을 읽어보는 것은 현실적으로 불가능하며, 여러 포탈 사이트에서 제공되는 실시간 검색어 순위만으로는 상세 내용을 직관적으로 파악하기 어렵다. 따라서, 이러한 SNS상의 글을 실시간으로 분석하여 최신의 트렌드를 찾고 이와 연관된 내용을 분류 및 요약할 수 있다면, 사용자에게 유용한 최신 정보를 생성하여 제공할 수 있다. 본 논문에서는 Tweet 들을 분석하여 얻은 트렌드 키워드를 기반으로 관련된 Tweet 들을 주제 별로 분류한 후, 각 주제 별로 세부 내용을 요약해서 제공하는 기법을 제안한다. 제안하는 기법은 실시간으로 생성되는 Tweet 내에서 최근 화제가 된 트렌드 및 연관 키워드를 추출해낸다. 그 후, 해당 키워드가 출현한 Tweet 내에서 핵심 키워드를 찾고, 이를 기반으로 Tweet 들을 각각의 주제별로 분류하고 각 주제를 '이슈'로 정의한다. 마지막으로, 특정한 이슈에 해당되는 Tweet들을 분석하여 각 이슈 별로 키워드 리스트 및 단문 형식으로 요약된 줄거리를 생성한다. 제안된 기법을 바탕으로 프로토타입 시스템을 구현하고, 다양한 실험을 통하여 이슈 검출 기법의 유용성 면에서 성능을 평가한다.

• 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 Advanced Marine Engineering and Technology
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• v.38 no.1
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• pp.78-85
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• 2014

The Mu-communication board supported by hybrid communication is designed with Cortex M3, which is a low power energy consumption 32-bit microcontroller. The Cortex M3 microcontroller has UART(Universal asynchronous receiver/transmitter) ports which can set appropriately using the command line interpreter (CLI) program with each port. URAT ports are used for hybrid communication modems, GPS modules, etc. When the socket type was compared with the short message service type, the socket type was proven to be better. By improving the receiving performance in the control and management system of the AtoN, data loss was minimized. During the testing of the socket and SMS, data was collected from each buoy for 12 hours every 1 minute and the receiving rate of the data was found to be more than 98.58 % and 99.42 % respectively.