• 제목/요약/키워드: 차세대정보시스템

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i-Manager: An Implementation of LOD Instance Development System (i-Manager : LOD 인스턴스 개발 시스템의 구현)

  • Moon, Hee-kyung;Han, Sung-kook
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.21 no.6
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    • pp.1174-1182
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    • 2017
  • The research and development on Web of Data to realize the opening and sharing of diverse, heterogonous data on the Web has been actively accomplished. As a standard data model for this effort, LOD (Linked Open Data) based on ontology has been proposed. A specialized instance generation system is vital to the development of LOD-based system effectively. This paper implements i-Manager as an appropriate environment for the development of LOD instances, considering the requirements of LOD systems and the practical development environment of the diverse application domains. i-Manager separates the instance layer from the ontology layer by way of LOD Interface Sheet (LIS) and implements the specialized functions requested in LOD instance development, such as instance edit/store, visualization and SPARQL query processing. This paper proposes a new approach for LOD instance development, and i-Manager can be applied for the practical LOD development environment in the diverse application areas.

Implementation of the T2-MI Demultiplexer for Hybrid Broadcasting (융합 방송을 위한 T2-MI 역 다중화기 구현)

  • Bae, Chul Kyun;Chae, Chang Seok;Lee, Hyo Jung;Kim, Young Hun;Kim, Dae Jin
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.20 no.5
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    • pp.949-956
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    • 2016
  • By recent development of wired and wireless communication technology, any service can be delivered through broadcasting networks or communication networks. So contents consumers want to receive broadcasting program via any accessible network. Network independent broadcasting system can receive optimized multimedia contents by combining the high-quality multimedia contents transmitted through broadcasting network and the additional contents delivered through communication network. Additional contents can be other multimedia contents, URL of contents, some texts for indicating information of received multimedia, etc. Network independent broadcasting system is in early stage of development, and receivers and the monitoring system for hybrid broadcast are under development. Thus the multiplexing method and demultiplexing method to perform hybrid broadcasting is on study. In this paper, we designed the demultiplexing algorithm to perform hybrid broadcasting system and implemented demultiplexer system based on modulator interface system standard T2-MI of DVB-T2.

Coverage Evaluation of mmWave Small Cell in Outdoor Environment (실외환경에서 밀리미터파 소형 셀의 커버리지 측정)

  • Nguyen, Thanh Ngoc;Jeon, Taehyun
    • Journal of Satellite, Information and Communications
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    • v.12 no.4
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    • pp.162-165
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    • 2017
  • In an effort to compensate the rising of the data throughput demand nowadays, there have been many research works to optimize the radio resource and increase the capacity of the network. At the present, small cell network, mmWave band and beamforming technology are leading the trend and becoming the core solutions of the fifth generation (5G) cellular networks. Since the propagation characteristics of radio wave in the mmWave band is quite different from the conventional bands, the communication systems which work in these bands have to be redesigned. In this paper, a 3D simulation model is discussed for cellular network at 60 GHz in outdoor environments. Coverage analysis and system performance is carried out for a small cell system in the typical urban environment including street canyon simulation scenario. In addition, the beamforming technique is considered to evaluate the throughput improvement. Simulation results show that the mmWave small cell systems is expected to be one of the major candidate technologies to satisfy the requirements of 5G in terms of data rate.

Wireless Sensor Network based Remote Power Monitoring System for Anti Islanding application in Smart-Grid (스마트 그리드 내 독립전원의 단독운전 방지를 위한 무선 센서 네트워크 기반의 원격 전력 감시 시스템)

  • Kim, Kee-Min;Lee, Kyung-Jung;Moon, Chan-Woo;Ahn, Hyun-Sik;Jeong, Gu-Min
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.10 no.4
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    • pp.57-62
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    • 2010
  • Renewable energy and smart grid become the focus of attention of industry. The smart grid is an intelligent system which maximizes the efficiency of energy and it needs to monitor the amount of power generation and power consumption continuously. Remote Monitoring System(RMS) is very useful for monitoring the power generation and consumption, but mostly they are implemented on the wire communication. In this paper, we propose a wireless sensor network based remote power monitoring system. And as an application, a new anti-islanding method with the proposed RMS is presented. An experimental micro grid system is implemented to verify the proposed RMS and anti-islanding method.

Wireless Access Network Virtualization Based on Distributed Antenna Systems (분산 안테나 시스템에 기반한 무선 액세스망 가상화)

  • Kim, Su Min;Jung, Bang Chul
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.16 no.10
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    • pp.2085-2094
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    • 2012
  • In this paper, we propose a wireless access network virtualization algorithm based on a digital unit (DU)-radio unit (RU) separated network structure in a cellular network with multiple radio access technologies (RATs). The proposed wireless access network virtualization algorithm consists of a baseline access network virtualization, RAT virtualization, and access path migration algorithms. Final wireless access network virtualization is performed by sequentially performing these procedures. Through system-level simulations which assume 3GPP LTE and WiMAX systems, the performance of the proposed wireless access network virtualization is evaluated in terms of system throughput for two scenarios according to asymmetry of network traffic load. Numerical results show that our proposed wireless access network virtualization algorithm achieves significant system throughput gain even in asymmetric traffic load and user distribution situations.

Design and Implementation for Efficient Multi Version ADS-B Target Report Message Processing (효율적인 다중 버전 ADS-B 타깃 리포트 메시지 처리를 위한 모듈 설계 및 구현)

  • Kim, Kanghee;Jang, Eunmee;Song, Inseong;Cho, Taehwan;Choi, Sangbang
    • Journal of Advanced Navigation Technology
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    • v.19 no.4
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    • pp.265-277
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    • 2015
  • Automatic dependent surveillance-broadcast (ADS-B) is the core technology of communication, navigation and surveillance/air traffic management (CNS/ATM), automatically broadcasts its own position information using GNSS and has an advantage of lower geological constraints and faster update speed compared with legacy radar systems. EUROCONTROL defined all purpose structured eurocontrol surveillance information exchange (ASTERIX) CAT.021. ASTERIX CAT.021 is modified several times, but it has compatibility issues with previous version of it. In this paper, we have designed an efficient message processing module regardless of the version of ASTERIX CAT.021. This implemented module generates patterns to collect messages received from the network, after that, received messages are processed in the routine that is defined in accordance with the patterns.

Adaptive User Selection in Downlink Multi-User MIMO Networks (다중 사용자 및 다중 안테나 하향링크 네트워크에서 적응적 사용자 선택 기법)

  • Ban, Tae-Won;Jung, Bang Chul
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.17 no.7
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    • pp.1597-1601
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    • 2013
  • Multiple antenna technique is attracting attention as a core technology for next-generation mobile communication systems to accommodate explosively increasing mobile data traffic. Especially, recent researches focus on multi-user multiple input multiple output (MU-MIMO) system where base stations are equipped with several tens of transmit antennas and transmit data to multiple terminals (users) simultaneously. To enhance the performance of MU-MIMO systems, we, in this paper, propose an adaptive user selection algorithm which adaptively selects a user set according to varying channel states. According to Monte-Carlo based computer simulations, the performance of proposed scheme is significantly improved compared to the conventional scheme without user selection and approaches that of exhaustive search-based optimal scheme. On the other hand, the proposed scheme can reduce the computational complexity to $K/(2^K-1)$ compared to the optimal scheme where K denotes the number of total users.

TV-Anytime Metadata Management System based on a Set-Top Box for Digital Broadcasting (디지털 방송을 위한 Set-Top Box기반 TV-Anytime 메타데이터 관리 시스템)

  • Park, Jong-Hyun;Kang, Ji-Hoon
    • Journal of the Korea Society of Computer and Information
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    • v.13 no.4
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    • pp.71-78
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    • 2008
  • Digital Broadcasting serves a variety of broadcasting services for satisfying the requirement of customers. One of main factors for new broadcasting environment is interoperability between providers and consumers. For this interoperability, metadata standards are proposed for the digital broadcasting and TV-Anytime metadata is one of these standards. On the one hand, there are some researches for efficiently managing the broadcasting metadata on Set-Top Box. This paper proposes the metadata management system for efficiently managing the broadcasting metadata based on the STB which is low-cost and low-setting. Our system consists of a storage engine to store the metadata and an XQuery engine to search the stored metadata and uses special index for storing and searching. We expect that our system will keep the interoperability amongst a variety of applications for broadcasting because we adopts the XQuery for searching the metadata and the XQuery is a standard language for searching XML data.

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A Study on the Future Development of Korean Institutional Repository through an Analysis of Developmental Aspects of Japanese (일본의 전개 양상을 통해서 본 한국 기관 레포지토리의 과제)

  • Cho, Jane
    • Journal of the Korean Society for information Management
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    • v.26 no.1
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    • pp.35-55
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    • 2009
  • IR(Institutional Repository) is an indispensable instrument for not only long time preservation of intellectual products but also for shifting commercial publishing company-dominated academic communication stream. In Korea, dCollection project of Ministry of education, science and technology has contributed on immediate, integrated circulation of distributed research products. dCollection is already one of the few integrating instrument for distributed academic resources, but it has not been university's voluntary instrument to announce their research accomplishments and to realize open access. On the other hand, Japanese government has promoted universities' IR operation through "Next generation infrastructure construction project." Even though distributing speed is relatively low, each university made ripe operating skill by their selves and realize its own purpose. This study comparatively analyzed policy and current status of Institutional Repository in Korea and Japan from various viewpoints. And also it proposed directions of development about Korean Institutional Repositories.

A Study on the Design with RDF Authoring Tool for Metadata Management (메타데이터 관리를 위한 RDF 저작도구 설계에 관한 연구)

  • 최호찬;김차종
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.8 no.3
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    • pp.605-613
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    • 2004
  • Recently, the semantic web stands out in the next generation web. To realize the semantic web, the metadata integration is required between different metadatas on the web for metadata management. Otherwise, the integrated structure is needed to accommodate all of semantic, syntax and structure. RDF is one of the core technology and is more efficient framework for technology and interchange of metadata in the web, In this paper, for metadata management, we designed and implemented the RDF authoring system which converts each of metadata into RDF and makes it easy to manipulate and manage the different metadatas. For this, we researched about the RDF creation using Dublin Core metadata, the conversion of XML document into RDF, the RDF expression by N-Triple form and the integration of WSDL and RDF, and implemented the system on the lava platform. Basically, users using this system can integrate and manage metadatas easily even if they are not expert.