• Journal of Digital Convergence
• /
• v.15 no.8
• /
• pp.195-202
• /
• 2017

Unmanned Aerial Vehicles (UAV) have mostly been used for military purposes but with the progress in ICT and reduced manufacturing costs, they are increasingly used for various private services. UAVs are expected to carry out autonomous flying in the future. In order to carry out complex tasks, swarm flights are essential. Although the swarm flights has been researched a lot due to its different network and infrastructure from the existing UAV system, There are still not enough study on security threats and requirements for the secure swarm flights. In this paper, to solve these problems, UAV autonomous flight technology is defined based on US Army Corps of Engineers (USACE) and Air Force Research Laboratory (AFRL), and swarm flights and security threat about it are classified. And then we defined and compared security requirements according to security threats of each swarm flights so as to contribute to the development of secure UAC swarm flights in the future.

• Journal of Information Management
• /
• v.43 no.4
• /
• pp.143-167
• /
• 2012

In this study, survey analysis was conducted to determine the demands of science & technology information service by the groups of users. The questionnaire was composed of the need for 20 services in the science & technology information, the need for personal information to people-to-people exchanges, and information that can be shared with others. KOSEN users 1,013 people participated in the survey, and the analysis of variance was conducted depending on institution, profession, final degree and the age of the respondents. Results of frequency analysis, there were in high demands for trend analysis, papers, research reports, patents, knowledge queries, project announcements, jobs, experimental methods, information society and study abroad/Post-doc information, and all services except mentoring, community and blog were appeared to have the significant differences depending on the groups of users. Also the personal information deemed to be necessary for interaction with others was resulted in specialization, thesis/research performances, career, organization, jobs, final degree and education in order, there were partially difference depending on the user's groups. In addition, 97% of respondents had their own scientific and technical information to be shared with other people in order of papers, presentations (ppt), reports, experimental methods and the images. The results of this study can be used as useful information for scientists and engineers to develop a user-centered personalized services and are expected to be helpful to set the direction of science information services in the future.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2005.11a
• /
• pp.1227-1230
• /
• 2005

최근 다양한 네트워크의 융합(Convergence) 추세에 따라 기존 PSTN 서비스도 인터넷에서 VoIP 형태로 제공이 되고 있다. 하지만 VoIP 서비스는 인터넷망을 이용하므로 부여된 발신번호 정보를 송출하지 않아 발신자의 위치 및 해당지역의 공공구조기관(PSAP)의 식별이 불가능하여 긴급서비스 지원을 위한 위치정보 제공을 못하는 문제점이 제기되었다. 최근 측위기술의 활용이 다양해지고 요구수준이 높아짐에 따라 실내에서의 신호 차폐 문제점을 극복할 수 있고, 높은 위치정확도 등을 제공하는 WLAN와 RFID 기술을 이용한 측위기술 연구가 활발하다. 따라서 본 논문에서는 Wi-Fi, RFID, GPS를 이용한 측위기술을 사용하여 무선이동통신 환경에서 VoIP 긴급서비스를 지원하기 위한 모델 제안과 각 구성요소에 대한 기능, 세부적인 지원 절차를 설명하고, 위치정보의 획득 및 처리를 위한 운용 시나리오에 관한 구체적 방안과 제안모델을 적용하기 위한 고려사항에 대한 분석결과를 제시한다. 그 결과 제안된 모델은 무선이동통신의 긴급서비스 설계시 적용이 기대된다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2017.05a
• /
• pp.491-494
• /
• 2017

Recently, IoT has been supported by ICT technology with a variety of ICT powers. In May 2014, Information and Communication Strategy Committee announced the 'Basic plan for Internet of Things'. Also on Febuary 24 this SAME year, KISA(Korea Internet&Security Agency) provides many projects related to IoT, such as announcement of 'K-Global Project' for start-up and venture support related to IoT and ICT companies. In contrast to the various services of Internet of Things, when a connection is made between object-to-object or person-to-object wired and wireless networks, security threats have occurred in the process of communication. We analyzed these kinds of security threats related to Internet of things, and gave a consideration for requirement.

• Journal of Advanced Navigation Technology
• /
• v.21 no.6
• /
• pp.579-584
• /
• 2017

SBAS is a satellite based navigation correction system that provides correction information and integrity information of GNSS signal through geostationary satellite based on analysis of GNSS signal in ground station. KASS, a Korean SBAS, is aiming at the APV-1 class SoL service in 2022. Sufficient ground and flight tests must be performed in advance to provide SoL services. However, since KASS, the Korean SBAS, has not yet been added in Korea, specific detailed evaluation items are not presented. EGNOS, which is expected to be the most compatible with KASS and is being serviced after its development, has already been evaluated. In this paper, we analyze the regulations applied to EGNOS construction and analyze the criteria of ground and flight test evaluation items required for flight testing, which is expected to be referenced to the flight inspection process in the future.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.23 no.8
• /
• pp.923-933
• /
• 2012

In this paper, we propose the technical considerations for the rules on television white space(TVWS), that becomes a center of public notice, in terms of incumbent services protection, technical requirements of television band devices (TVBDs) and administration of TV band databases. The basic idea behind the proposed method is based on the perfect protection of incumbent services such as digital television and wireless microphone. It has been found that FCC's approach has the advantage that a list of available channels and transmission power are provided for TVBDs faster than Ofcom's approach that requires DB to perform the algorithm for determining frequencies and transmission power for TVBDs everytime DB is asked from TVBDs.

• Journal of the Korean BIBLIA Society for library and Information Science
• /
• v.21 no.2
• /
• pp.5-13
• /
• 2010

As today's information environment changes rapidly with the development of information technology, users expect a variety of the library services that meet their emerging needs. This paper reports the concept of reciprocal borrowing and analyzes the cases of reciprocal borrowing programs in the US. Particularly, this paper introduces (1) three cases of state-wide library cards such as Georgia's PINES card, Maryland's MPower card, and Michigan's Michi card. (2) Public library systems in the U.S. also are introduced as a type of reciprocal borrowing. Another type of reciprocal borrowing mentioned in this paper was (3) an mutual agreement between and among libraries. The author sought the deeper understanding of reciprocal borrowing by mapping the cases described in this paper into three models of reciprocal borrowing Kwak et al.(2010) suggested. This paper concludes with a few important considerations in implementing reciprocal borrowing services in Korea.

• 한국IT서비스학회:학술대회논문집
• /
• 2006.11a
• /
• pp.352-359
• /
• 2006

VoD 전송 방식을 설계할 때 가장 중요한 요소들에는 정해진 대역폭에서 사용자 대기시간 (Viewer's Waiting Time)과 클라이언트에서 요구하는 최대 버퍼 요구량(Max Client Buffer Requirement)을 줄이는 문제를 꼽을 수 있다. 점점 더 복잡해지는 VoD 전송 기술의 개발로 인해 사용자 대기시간과 최대 버퍼 요구량의 관점에서 성능 향상과 반비례하는 시스템 복잡도를 줄이는 문제 또한 VoD 전송 방식을 설계 시 고려 해야 할 중요 사항 중의 하나이다. 이 논문에서는 시스템 복잡도를 낮추면서 사용자 대기시간과 최대 버퍼 요구량의 성능을 동시에 향상시키기 위한 방법으로 기존의 VoD 전송 방식들 가운데 가장 간단한 모델과 최대 버퍼 요구량의 성능을 가장 향상시킨 모델의 결합으로 구현 가능한 Hybrid 방식을 제안하고 있다. 이 논문은 결과적으로 사용자 대기시간은 기존 Staircase Broadcasting방식과 Fast Broadcasting 방식과 비교했을 때 동일한 성능을 나타내고 있고 최대 버퍼 요구량은 유사성능을 나타냄을 알 수 있다. 이 논문에서 제안한 방식은 사용자 대기시간이 짧아야 하고 저장공간이 많이 요구되지 않으며 사용자의 요청이 갑자기 증가될 수 있는 hot 비디오에 적용이 가능하다. 또한 다양한 환경에 따라 Staggered Broadcasting 방식과 Staircase Broadcasting 방식의 채널 수를 적절히 조정함으로써 데이터 송수신 효율을 극대화 시킬 수 있다. 이 논문의 구성은 제시한 방법에 적용된 방식들과 비교대상이 되는 방식들에 대해 살펴보고 제시한 방식의 성능 모델을 이용한 실험을 통해 각종 VoD 전송 방식들과 비교 분석하는 과정으로 기술하였다.

• Journal of the Korean Society for Library and Information Science
• /
• v.48 no.4
• /
• pp.135-171
• /
• 2014

The aim of this study was to suggest a classification system adapted to provide policy information services. For this purpose, this study completed the following processes; BRM taxonomy analysis, document analysis, analysis of classification systems providing policy information, consulting classification experts, surveys and interviews with policy information consumers, and an empirical validation process through the actual construction of policy information materials. Finally, this study complemented and modified the BRM taxonomy system and proposed a classification system appropriate to policy information resources. Through the procedures of experts discussion, the steps of BRM analysis appropriate to provide policy information services is determined as three steps. The domestic institute websites for policy information services has confirmed the appropriateness of the BRM taxonomy system through the analysis system and service research to provide policy information resources. Also through the specialist interview, the confirmation of BRM and the improvement has been drawn. Through the questionaires, the study analyzes the appropriateness of available BRM taxonomy system and the requirements by subjects. And through the empirical verificaion, it determines the subject of BRM taxonomy system for policy information services.

• Journal of the Korean Society for Library and Information Science
• /
• v.54 no.2
• /
• pp.29-52
• /
• 2020

This study reports a field study that examined the citizens' needs and perceptions of library services at a municipal public library system of Mapo-gu, in an attempt to develop a comprehensive service plan that can satisfy the diverse public needs in the changing social environment. We administered a self-reported questionnaire to 800 library users and 300 non-users in the area to examine their reading habits, library use, and perceptions of library services and programs. As a result of the analysis, 53.7% of Mapo-gu residents used one or two libraries among all 16 municipal libraries, and the primary criterion for selecting the main library was accessibility(63.9%). And only 53.8% of library users had experience participating in the library programs. The respondents also showed strong perception that the library is an essential place for the community and the children. Study results indicate that the library system should further expand the collection size, diversify information contents, improve the physical space including library facilities, and build more libraries. In order to fulfill the role of public libraries as the central place of the community, the municipal city should further invest in enhancing accessibility, spatial innovation, and diversifying service contents and media.