• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.16 no.3
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• pp.173-178
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• 2016

Many studies have been carried out on monitoring the target by cooperating a drone with remote sensors recently. This monitoring system uses static sensors to measure environmental data and drones to collect measured data. In geotechnical engineering, inspectors go around measuring the safety of construction site and it is impractical to compose a network among numerous sensors in terms of the cost efficiency. In this paper, we propose a data collection system based on interaction between a drone and a few sensors that are installed around the target structure for geotechnical projects. Through experimental results, we also verify the availability and the time and cost efficiency of the proposed system comparing with using inspectors.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.10a
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• pp.90-93
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• 2016

본 논문에서는 Sub-GHz band module을 Drone에 탑재하여 Drone과 전원공유로 Node(Drone)간 Low power and Long range Ad-hoc communication을 할 수 있는 방법을 제안하고자 한다. 또한 이동성이 있는 Node(Drone)의 Low power and Long range communication을 위해서 Drone에 적합한 Asynchronous MAC (medium access control) protocol을 비교분석하여 적용하였다. 본 고에서는 무선 센서 네트워크의 응용 범위가 확대되면서 고정된 인프라 없이 Drone간에 실시간 정보를 통신 할 수 있게 하고 사람의 이동이 어렵고 위험한 재난지역, 방사선노출지역 또는 우천시 유인기와 사람의 접근이 불가능한 지역을 Drone이 대신 이동하여 인명피해를 줄이고 안전하게 필요한 데이터를 수집하여 상황관제실로 전송하는 서비스를 제공하고자 한다.

• Journal of Information Management
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• v.26 no.3
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• pp.1-31
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• 1995

As information technology has developed, the function of a library has been expanding gradually. The traditional library has changed into the electronic library so that users can directly access the library from remote sites and get electronic information without visiting the library. The purpose of this study is to build a model on the basis of the elements that are identified from the existing electronic libraries, and then to survey the current state of electronization in Korean university libraries. The electronic library model consists of four elements : OPAC, commercial online databases, CD-ROM databases, electronic books and journals, access to OPACs of other libraries, and access to other information resources through Internet.

• Journal of the Institute of Convergence Signal Processing
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• v.1 no.2
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• pp.145-152
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• 2000

Some evolutional system has been used to promote the efficiency of the DNC(Direct Numerical Control) Controller. However, these are many inconvenience to this operator because it lacks harmony in interaction between the computer and the NC(Numerical Control) Controller. Also, there are some controversial points when data error occurs at the Data Input/Output. Accordingly, this paper explores a new Data Remote Control System. In this study, the NC Controller of the DNC network has to get full data by removing data error in this system. In this system, the main merits are easy manufacturing and the convenience of Data Input/Output. That is, remote control of the NC machine tool is possible without mutual interaction between the computer and itself.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.10a
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• pp.677-680
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• 2010

스마트폰의 빠른 보급으로 위치기반 서비스 (Location Based Service)가 새롭게 주목 받고 있다. 위치기반 서비스는 이동통신망이나 위성항법장치 (GPS) 등을 통해 얻은 위치정보를 바탕으로 이용자에게 여러 가지 서비스를 제공하는 서비스를 말한다. 현재 위치기반 서비스는 소셜 네트워크 서비스, 증강현실, 게임 등 다양한 분야에서 활용되고 있다. 그러나 단순 정보뿐만 아니라 복합 상황정보를 이용한 안전 및 사고예방을 위한 애플리케이션은 부족한 실정이다. 본 논문에서는 휴대성과 이동성의 장점을 가진 스마트 모바일 환경에서 위치기반 서비스를 통해 상황정보를 제공하는 지능형 감시 시스템을 개발하고자 한다. 본 시스템은 감시대상자가 소지한 스마트폰의 GPS를 이용하여 위치 데이터를 획득하고, 기울기 및 압력 센서 등을 이용하여 감시대상자의 상태정보를 획득 한다. 또한 이러한 위치 데이터와 센싱 데이터를 지도 OpenAPI, 날씨 OpenAPI, 안전/위험지역 설정 등의 기능과 결합하여 지능적 복합 상황정보로 표현한다. 이러한 기능들을 안드로이드 기반 애플리케이션으로 개발함으로써 감시자 또한 모바일 환경에서 감시할 수 있도록 한다. 이를 통해 감시자는 이동하면서 원거리에 있는 감시대상자의 실시간 이동경로와 복합 상황정보를 확인하고 알림 받을 수 있다. 이와 같은 기능을 통해 아동 범죄, 노약자 보호 등의 문제를 해결할 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.05a
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• pp.825-828
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• 2004

몰입형 가상현실 시스템의 발전은 더욱 현실감 있는 가상 현실의 구현을 가능케 했으며, 이런 몰입형 가상 현실의 현실감으로 인해 자동차 설계나 시뮬레이션 실험 등의 공학 분야에서부터 의료 분야에 이르기까지, 가상 현실은 그 실용 범위를 꾸준히 넓힐 수 있었다. 최근에는 문화재 복원 분야에 몰입형 가상현실 시스템을 사용하는 연구가 활발하게 이뤄지고 있으며, 가상현실과 네트워크 환경을 접목해서 원거리에 있는 시스템 사용자들 간에 컨텐츠를 공유하고 상호작용을 교류하는 가상 협업 시스템도 실용화 단계에 이르렀다. 본 논문에서는 가상협업환경에 가상 문화재 복원이라는 컨텐츠를 접목시킨 소프트웨어의 설계와 구현에 관해 논한다. 복원에 사용된 컨텐츠는 1868 년 흥선대원군이 중건했을 당시의 경복궁이며, 경복궁의 3D 모델링 데이터를 몰입형 가상 현실 시스템인 CAVE 환경에서 가시화하고 협업 환경을 구축하는데 구현의 초점을 맞추었다. 몰입형 가상 현실을 사용한 협업 시스템은 협업환경을 필요로 하는 모든 응용 분야를 확장해서 사용자의 이해도와 체험도를 최대로 이끌어낼 수 있으므로, 향수 다양한 분야로 그 범위를 확장해서 적용할 수 있다.

• Convergence Security Journal
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• v.11 no.4
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• pp.77-83
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• 2011

In addition to the rapid development of health information technology services for the development of new medical information, a lot of research is underway. Improve health care services for patients are many ways to help them. However, no information about the security, if only the technology advances in health care systems will create an element of risk and threat. Today's issues and access issues are stable over a public network. Ad hocsensor network using secure, non-integrated health information system's security vulnerabilities does not solve the security vulnerabilities. In the development and utilization of health information systems to be subject to greater restrictions. Different security policies in an environment with a medical information system security policy mechanism that can be resolved if people get here are needed. Context-aware and flexible policy of integration and confidential medical information through the resistance should be guaranteed. Other cross-domain access control policy for telecommunications should be protected. In this paper, that the caller's medical information system, diversification, diversification Security agent in the environment, architecture, design, plan, role-based security system are proposed. The proposed system architecture, design work in the field and in the utilization of one model are expected to be.

• The KIPS Transactions:PartC
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• v.8C no.5
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• pp.637-646
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• 2001

The multicasting telecommunication is an important research as an applicable technique in the development of adaptable technique for modern mobile computing and mobile IP, because that is supposed to be a solution for transferring the large-size information on the mobile and wireless network with the narrow bandwidth. This paper will suggest one solution for the bidirectional tunneling and the local re-registration problems to support transferring mobile multicasting datagram by the partitioned network. The bidirectional tunneling technique is in use for mobile host moving around in a region and the local re-registration technique for crossing regions to reduce traffic load caused by transferring datagram along a long distance, and we compare those models with our suggested model by simulation.

• Journal of KIISE:Computing Practices and Letters
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• v.9 no.3
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• pp.227-240
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• 2003

When we develop and use the java-based distributed object system, the system developer must deploy distributed object, which is implemented to predefined interface, to network and the system user acquires reference about distributed object and changes reference to interface type. Sharing of interface is essential for these works In this paper, we propose the IRSJ(interface repository service based on jim) to improve efficiency of interface sharing at the JINI system development. the IRSJ is consisted of the java classes for JINI system and interface sharing service. If development teams perform collaborative work in short distance, the IRSJ can search interface file without information of lookup server or interface writer If development teams perform collaborative work in long distance, the IRJS can search interface with only an address of server that executes lookup service. Although the interface object not requires additional search, the interface object that failed search interface can download interface and use interface using remote event model. When the message service fails in interface search, the message service sends interface request message to a development team member who use the IRSJ automatically, so that interface sharing may be possible in short time.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.19 no.5
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• pp.515-522
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• 2008

In this paper, a slot antenna with built-in Bazooka balun aimed for a WiBro repeater was designed and fabricated. The return loss and radiation pattern of the slot antenna were improved due to the introduced Bazooka balun. This balun brings about even radiation pattern and keeps the stabilized coverage of repeater And it is easy to unite this balun with the antenna body by providing the terminal of Bazooka balun with screw shape. H-type slot was used to reduce the size of the antenna, and the slot antenna was fabricated in the structural symmetry with respect to a feeding point to afford the omni-directional radiation pattern. The simulated results were obtained by MWS(Microwave Studio Simulator) of CST company, and the measurement on the proposed antenna was conducted in an anechoic chamber equipped with a network analyzer and a far field measurement system. The measured peak gain shows 5.75 dBi and the average gain is above -0.8 dBi. The return loss remains below -12.35 dB for all frequency bands in WiBro regarded as a good performance.