• The KIPS Transactions:PartC
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• v.14C no.5
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• pp.453-462
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• 2007

NGN is a packet-based converged network to support session and non-session based services in QoS-enabled broadband transport technologies. Resource and admission control functions(RACF) of NGN have been considering COPS and SNMP as resource management protocols to collect network topology and resource status information of transport network. This paper defines requirements of resource management in NGN transport network, and proposes protocol independent information model to keep consistency of data models of each resource management protocol. Based on this information model described with UML class diagram, we designed and implemented NGN resource management system on Web Services.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.155-156
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• 2009

본 논문에서는 오류 상호 인지 및 제어 기능이 있는 IP-USN 기반의 멀티미디어 공동 작업 환경에 대하여 기술한다. 동적 오류 관리를 위해서 상호 인지가 필요하다. 상호 인지란 상호 작업 이해, 참여자 관계 설정 등 결합이라는 구현 기술을 말한다. 인지의 구현 방법에는 파일 공유, 윈도우 복사, 윈도우 오버레이, 또는 윈도우 공유 등이 있다. 윈도우 오버레이 기능에 세션 제어, 발언권 제어 등을 추가한 윈도우 공유 방법을 기술한다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.22 no.6
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• pp.1315-1324
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• 2012

Security visualization is a form of the data visualization techniques in the field of network security by using security-related events so that it is quickly and easily to understand network traffic flow and security situation. In particular, the security visualization that detects the abnormal situation of network visualizing connections between two endpoints is a novel approach to detect unknown attack patterns and to reduce monitoring overhead in packets monitoring technique. However, the session-based visualization doesn't notice a difference between normal traffic and attacks that they are composed of similar connection pattern. Therefore, in this paper, we propose an efficient session-based visualization method for analyzing and detecting between normal server activities and attacks by using the IP address splitting and port attributes analysis. The proposed method can actually be used to detect and analyze the network security with the existing security tools because there is no dependence on other security monitoring methods. And also, it is helpful for network administrator to rapidly analyze the security status of managed network.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10b
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• pp.224-226
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• 1999

본 논문에서는 다양한 목적의 공동 작업 시스템에서 공통적으로 사용할 수 있으며, 플랫폼에 독립접인 웹 기반의 화이트 보드와 채팅을 설계하고 구현한 내용을 소개한다. 본 논문에서 구현한 시스템은 서버/클라이언트 구조로서, 서버와 클라이언트 모두 JAVA로 구현하였다. 그러므로 플랫폼에 독립적인 서버 시스템(application)을 구성할 수 있으며, 별도의 어플리케이션 없이도 웹 브라우저만 있으면 클라인언트의 접속이 가능하다. 멀티유저와 멀티작업그룹을 지원하기 위해서 서버에는 접속 관리자와 세션 관리자를 두었으며, 각각 쓰레드로 동작하여 서버의 부하를 줄이고, 또한 서버와 클라이언트간의 통신이 실시간으로 이루어지게 하였다. 웹 사이트와 MS Office 문서의 공유, 1:1대화, 작업 포인터 등의 기능을 지원하여 공동 작업의 효율을 증진시키고, 마치 동일한 공간에서 작업하고 있는 듯한 효과를 얻게 하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.10a
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• pp.303-306
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• 2011

System solutions for access control to the user's personal when you want to authenticate to the system is used. The valid user is really just a part of authorized users, the suitability of a valid user has been authenticated are not sure whether the problem is the fact. For example, one developer in the Unix operating system can be valid, but do not have permission to access the system should be limited for. In this paper, a single account for multiple users to use the system operational issues to improve the fine-grained delegation of authority, the session audit, the administrator account's policy-based management, with full rights the administrator account of distribution management and auditing the system overall is the study of access control measures.

• Journal of Engineering Education Research
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• v.10 no.3
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• pp.79-92
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• 2007

To enhance the excellence, effectiveness and economical efficiency in the learning process, we implement a hybrid educational system for engineering experiments where web-based virtual laboratory systems and distance education systems are properly integrated. In the first stage, we designed client/server distributed environment and developed web-based virtual laboratory systems for digital systems and electrical/electronic circuit experiments. The proposed virtual laboratory systems are composed of four important sessions and their management system: concept learning session, virtual experiment session, assessment session. With the aid of the management system every session is organically tied up together to achieve maximum learning efficiency. In the second stage, we have implemented efficient and cost-effective distant laboratory systems for practicing electric/electronic circuits, which can be used to eliminate the lack of reality occurred during virtual laboratory session. The use of simple and user-friendly design allows a large number of people to access our distant laboratory systems easily. Thus, self-guided advanced training is available even if a lot of expensive equipment will not be provided in the on-campus laboratories. The proposed virtual/distant laboratory systems can be used in stand-alone fashion, but to enhance learning efficiency we integrated them and developed a hybrid educational system for engineering experiments. Our hybrid education system provides the learners with interactive learning environment and a new approach for the delivery of engineering experiments.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.11c
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• pp.2179-2182
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• 2002

EJB(Enterprise Java Beans)는 비즈니스 로직을 컴포넌트 형태로 작성하여 재 사용성을 향상시킨 서버 측 컴포넌트 모델로서, J2EE(Java2 Enterprise Edition)의 핵심이다. EJB는 컴포넌트를 특성에 따라 일반적인 비즈니스 로직을 나타내는 세션 빈(Session Bean), 데이터베이스에 저장된 데이터를 나타내는 엔터티 빈(Entity Bean) 그리고 JMS 메시지를 처리하는 메시지 드리븐 빈(Message-driven Bean)으로 구분한다. 이러한 빈들은 EJB 서버에 의해 관리된다. 본 논문에서는 EJB 서버에서 EJB 빈의 라이프 싸이클을 관리해주는 인스턴스 관리자(Instance Manager)에 대해 논의한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.11a
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• pp.842-844
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• 2013

범죄예방이나 위급사항에 대한 대응 등 CCTV의 다양한 필요성에 따라 CCTV를 통합관리하는 CCTV 통합관제 센터가 늘어나고 있다. 행정안전부는 2015년까지 전국 시군구에 CCTV 통합관제센터 구축을 추진하고 있어 앞으로도 계속적으로 증가할 예정이다. 하지만 CCTV관제센터는 증가하고 있음에도 이를 관리할 전문 모니터링 요원이 부족하며, 동시에 이들이 영상정보를 개인의 호기심이나 이득을 위해 사용하는 일이 발생 할 수 있다. 본 논문을 Shamir's Secret Sharing 방법을 이용하여 암호화된 키를 분배하고 요청에 따라 일정 수 이상의 분배키가 모이면 영상 열람권한을 주는 방식으로 설계 하여 관리자가 임의로 영상정보에 접근하는 상황을 방지하였다. 또한 암호키와 랜덤한 값을 이용한 세션키 생성 등을 통해 다양한 보안위협에도 대응하였다.

• Journal of the Korean Society for information Management
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• v.38 no.3
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• pp.141-174
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• 2021

In this study, by examining the actual usage data of the university library website before and after COVID-19 outbreak, the usage behavior of users was analyzed, and the data before and after the virus outbreak was compared, so that university libraries can provide more efficient information services in a pandemic situation. We would like to suggest ways to improve it. In this study, the user traffic made on the website of University C was 'using Google Analytics', from January 2018 to December 2018 before the oneself of the COVID-19 virus and from January 2020 to 2020 after the outbreak of the virus. A comparative analysis was conducted until December. Web traffic variables were analyzed by classifying them into three characteristics: 'User information', 'Path', and 'Site behavior' based on metrics such as session, user, number of pageviews, number of pages per session time, and bounce rate. To summarize the study results, first, when compared with data from January 1 to January 20 before the oneself of COVID-19, users, new visitors, and sessions all increased compared to the previous year, and the number of sessions per user, number of pageviews, and number of pages per session, which showed an upward trend before the virus outbreak in 2020, increased significantly. Second, as social distancing was upgraded to the second stage, there was also a change in the use of university library websites. In 2020 and 2018, when the number os students was the lowest, the number of page views increased by 100,000 more in 2020 compared to 2018, and the number of pages per session also recorded10.46, which was about 2 more pages compared to 2018. The bounce rate also recorded 14.38 in 2018 and 2019, but decreased by 1 percentage point to 13.05 in 2020, which led to more active use of the website at a time when social distancing was raised.

• Proceedings of the Korea Information Processing Society Conference
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• 2010.04a
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• pp.127-130
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• 2010

본 논문에서는 산업 안전 서비스를 위한 오류 상호 인지 및 제어 기능이 있는 IP-USN 기반의 멀티미디어 공동 작업 환경에서의 동적 오류 관리기에 대하여 기술한다. 산업 안전 서비스를 위한 동적 오류 관리를 위해서 상호 인지가 필요하다. 상호 인지란 상호 작업 이해, 참여자 관계 설정 등 결합이라는 구현 기술을 말한다. 인지의 구현 방법에는 파일 공유, 윈도우 복사, 윈도우 오버레이, 또는 윈도우 공유 등이 있다. 산업 안전 서비스를 위하여 윈도우 오버레이 기능에 세션 제어, 발언권 제어 등을 추가한 윈도우 공유 방법을 기술한다.