• Electronics and Telecommunications Trends
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• v.32 no.5
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• pp.74-84
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• 2017

In wireless access networks, it is extremely important to provide high quality of real time and interactive services, including voice and video traffic. Furthermore, low latency communication is shifting toward new paradigm which enhances user's high quality of experience, meeting the requirements for specific applications such as tactile internet, remote-control robot and machines, and mission critical application. In this paper, we introduce the approaches to achieve the extremely low latency service. The approaches include the core requirements and the key technologies providing low latency communication maintaining high reliability in wireless access networks.

• Journal of Multimedia Information System
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• v.1 no.1
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• pp.23-43
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• 2014

With the rapidity of the development on electronic technology, various mobile devices are produced to make human life more convenient. The user is always in constant search of middle with ease of deployment. Therefore, the development of infrastructure and application with ubiquitous nature gets a growing keen interest. Recently, the number of pervasive network services is expanding into ubiquitous computing environment. To get desired services, user presents personal details about this identity, location and private information. The information transmitted and the services provided in pervasive computing environments (PCEs) are exposed to eavesdropping and various attacks. Therefore, the need to protect this environment from illegal accesses has become extremely urgent. In this paper, we propose an anonymous authentication and access control scheme to secure the interaction between mobile users and services in PCEs. The proposed scheme integrates a biometric authentication in PKI model. The proposed authentication aims to secure access remote in PCE for guaranteeing reliability and availability. Our authentication concept can offer pervasive network service users convenience and security.

• 한국HCI학회:학술대회논문집
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• 2007.02a
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• pp.262-267
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• 2007

다자간 분산형 협업 시스템인 Access Grid(AG)는 IP 멀티캐스트 네트워크상에서 여러 사용자들 간에 영상, 음성 및 다양한 데이터의 공유를 통해 상호 의사소통이 가능한 공동 작업환경을 제공하기 위해 개발되었다. 멀티캐스트를 사용함으로써 AG는 대역폭 효율적으로 다수 사용자 사이의 의사소통 환경을 제공하고 있다. 그러나 IP 멀티캐스트의 설정 및 관리상 복잡성으로 인해 이를 지원하지 않는 네트워크가 다수 존재한다. 이는 AG를 이용한 협업 서비스를 이용하는 데에 큰 장애물이 되고 있다, 본 논문에서는 이러한 멀티캐스트 연결성 문제에 대한 해결책으로 응용 계층의 멀티캐스트 터널링 프로토콜인 UMTP (UDP multicast tunneling protocol) 를 확장한 멀티캐스트 연결성 솔루션인 AG Connector를 제안한다.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.13 no.2
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• pp.169-182
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• 2002

This paper looks at several areas in which American public libraries are beginning to transform themselves. These include : (1)their mission and roles in the community；(2)the provision of Internet access；(3)remote user access；(4) customer-driven services； and (5) the changing roles and functions of librarians. It also examines some of the other controversial issues that are confronting public libraries as they implement technological change.

• International Journal of Contents
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• v.8 no.3
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• pp.79-82
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• 2012

In digital contents distribution environments, a user authentication is an important security primitive to allow only authenticated user to use right services by checking the validity of membership. For example, in Internet Protocol Television (IPTV) environments, it is required to provide an access control according to the policy of content provider. Remote user authentication and key agreement scheme is used to validate the contents accessibility of a user. We propose a novel user authentication scheme using smart cards providing a secure access to multimedia contents service. Each user is authenticated using a subset of attributes which are issued in the registration phase without revealing individual's identity. Our scheme provides the anonymous authentication and the various permissions according to the combination of attributes which are assigned to each user. In spite of more functionality, the result of performance analysis shows that the computation and communication cost is very low. Using this scheme, the security of contents distribution environments in the client-server model can be significantly improved.

• International Journal of Internet, Broadcasting and Communication
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• v.9 no.1
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• pp.42-49
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• 2017

Despite the government's various safety measures, the number of safety accidents continues to rise and the interior is more likely to occur indoors than outdoors. Safety accidents involving young children account for more than 70 % of the safety accidents in the safety accidents, and the ratio of safety accidents in the classroom or classroom is more than 50 %. In this thesis the author proposes the system managing the accidents notification service using LED lighting and access entry control. Utilizing IoT technology, remote control or access can be controlled remotely by controlling multiple lights and entrances from each room and by means of a number of lighting and entrances. By monitoring and analyzing real-time status via server PC and mobile interface, it can control the maximum control and incident prevention, automatic control, and automatic control.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.26 no.12B
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• pp.1629-1636
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• 2001

A CDMA-PON system is proposed to be used for the optical access network which is becoming indispensable to keep up with the subscriber\`s uprising data traffic. CDMA technique is efficiently used not just to deliver multiple channels to each remote unit, but also to suppress the optical beat noise. In this study, multiple beat noises environments was analysed, modulation schemes for both forward and reverse links were suggested and a simulation and basic experiment for multiple channels was performed successfully.

• Publications of The Korean Astronomical Society
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• v.30 no.2
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• pp.719-720
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• 2015

These days, advanced technologies provide an easy way for the public to obtain information about anything, including astronomy. Most people know astronomy for its sky events and scientific results. In Indonesia, the public has a high interest not only in astronomy information but also in participating in astronomy events, but it is limited to those who has access to a club nearby. Otherwise, for those who live in remote areas or simply don't have any access, they depend on information from newspapers, magazines, books or word of mouth. They usually think that astronomy is a difficult subject to learn, while in fact it is something doable and fun.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.11a
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• pp.124-126
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• 2013

대량의 메모리, 네트워크 장치, 저장매체, CPU 등으로 구성된 데이터 센터의 운용에 있어서 시스템 구축이나 운용을 단순화하기 위한 가상화가 고려되고 있다. 특히 금융 분야와 같이 데이터의 폭증 시대에 대응하기 위한 분산 서버 노드의 메모리 가상화 시스템을 고려할 수 있으며 본 연구에서는 이러한 메모리 가상화 시스템을 운용하는데 있어서 지연을 최소화하기 위한 인피니밴드의 활용방안에 대하여 검토한다. 인피니밴드의 메모리 접속 기능인 RDMA (Remote Direct Memory Access)를 더욱 쉽게 사용하기 위한 사용자 친화적인 라이브러리 구현 방법을 제안하며 RDMA 사용 시 발생하는 지연 현상을 분석하였다.

• Electronics and Telecommunications Trends
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• v.36 no.4
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• pp.13-22
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• 2021

Among the activities of 3GPP for operating 5G-based unmanned aerial vehicles, we introduce several use cases of UAVs in 5G mobile communication such as radio access node onboard UAV, simultaneous support data transmission for UAVs and eMBB users, autonomous UAVs controlled by AI, isolated deployment of radio access through UAV, and separation of UAV service area. From this, we further summarize 5G mobile communication requirements for UAVs, including definition and operational criteria of UAS, UAS remote identification requirements, UAS usage requirements, and performance requirements. Finally, regarding 5G mobile communication-based UAS connectivity, identification and tracking support, we discuss the 3GPP UAV architecture, seven major problems, the proposed solutions to each problem, and propose the results for future specification work.