• Smart Media Journal
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• v.13 no.1
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• pp.52-59
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• 2024

This paper proposes a plan to improve the reception radio environment of the mobile terminal and maintain a constant reception electric field by using small cells in a small closed environment. In order to configure an efficient communication infrastructure for small cells, both ends of wireless transmission and reception of an Ethernet-based wireless video recording system are connected using an L2 switch. The small cell connected to the receiving side L2 switch shares the wireless network section of the wireless video recording system and connects to the transmitting side L2 switch. After that, when it is normally linked to FMS, a management system for small cells, through the Internet network, the output of small cells is checked. In order to verify the results, a proposed network is formed on the elevator inside the building with a poor radio wave environment, and the radio wave environment is measured before and after the small cell application in the section where the elevator operates. As a result, the main parameters of the radio wave environment in all sections of the elevator are improved, as well as a constant receiving electric field strength within the moving elevator.

• Korean Journal of Construction Engineering and Management
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• v.9 no.1
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• pp.66-76
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• 2008

Plant project is a complex project that consists of civil engineering, building, mechanical and electronic works. The schedule management is one of important factors in plant project because the construction duration of the project is very short comparing with the other construction projects. Specially, 4D CAD system needs to visualize construction schedule information in those complex projects. This study suggests methodologies for improving 4D CAD functions by considering those project characteristics. To develop a plant 4D CAD system, this study includes to develop new functions by analyzing actual schedule information from the plant construction sites.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.1
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• pp.142-148
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• 2003

We compress medical images in order to solve problems both of request of storage mediums and of a low network speed. In this paper, integration compression environment has been developed for unity of various compression methods. Various compression methods that are implemented by integration compression environment, RLC, Lossless JPEG, and JPEG, comply with the DICOM 3.0. A compression method using DWT is implemented at it. And a unit method of Lossless compression method and lossy compression method is designed to improve images quality and to progress compression ratio. Diverse medical images can be compressed by each compression method. And integration compression environment is operated together database so that information of medical images is administered.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.49 no.6
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• pp.83-89
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• 2012

In this paper, the new user mobility management scheme which can be utilized to register user's location for interworking with heterogeneous overlay convergent networks under the time-varying radio propagation environment has been proposed. Thus the user mobility management can be considered in order to model and to evaluate the behaviors of users in the overlay convergent networks. This mobility management scheme will be very useful in characterizing the user mobility behaviors and can be used to estimate the signaling traffic and frequency spectrum demands for massive data transfer for the heterogeneous overlay convergent networks.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.29 no.3
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• pp.147-153
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• 2017

In this paper, a test is performed to verify the mechanical durability of acoustic sensor system mounted in seabed given test specification. High system durability is required for acoustic sensor system which is costly for installation process, and is affected with various tensional loads by installation equipments. So, it is necessary to verify the system durability including its performance or lifetime in mounted environments. The list of specified tests is mainly based on UJ QTS 200 and the system mostly satisfies the test specification for electrical characteristics.

• Journal of Korea Spatial Information System Society
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• v.5 no.1 s.9
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• pp.5-12
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• 2003

The purpose of this paper is to present guidelines on technical GIS policy for integrating GIS with emerging information technologies and infrastructure systems for national GIS development. These guidelines are expected to advance the development of GIS and stimulating GIS industry, by anticipating potential problems. This paper consists of foul parts. After Introduction, section two covers the present and upcoming status of essential information technologies including communications, security, LBS, Ubiquitous and standardization. Section 3 describes the guidelines for combing GIS and emerging IT for national GIS development. The final section summarizes and derives conclusions.

• Journal of Korean Society of Transportation
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• v.14 no.3
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• pp.173-190
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• 1996

본 논문에서는 최근 차량의 급격한 증가로 인해 더욱 더 가중되고 있는 도시내 교 통혼잡 완화를 위한 하나의 현실적 대안으로 무선 호출망을 이용한 ATIS (첨단 교통정보시 스템)의 구체적 구현방안을 제시하였다. ATIS를 위한 통신매체로서 무선 호출망을 사용하는 것은 다음과 같은 잇점을 갖는다. (1) 교통정보의 동시전송 가능 및 이를 통한 무선채널의 경제성 제고, (2) 간단한 망접속 절차 및 송수신의 안정성, (3) 하드웨어 및 통신비용의 저 렴, 시스템 구현 및 시험을 위해 무선 호출망을 이용한 교통정보 전송 프로토콜 및 시험용 전자지도를 개발하였으며, 이의 실용화를 위한 교통정보 서버 및 무선 호출망을 이용한 교 통정보 전송 프로토콜 및 시험용 전자지도를 개발하였으며, 이의 실용화를 위한 교통정보 서버 및 무선 호출망과 연동되는 차량내 교통정보 단말장치를 개발 중에 있다. 실현 가능성 시험을 위한 PROTOTYPE 시스템을 개발하였으며, 이를 이용해 시험적인 실제 무선 호출망 을 통해 가상 교통정보 송수신 시험을 하여 만족할만한 결과를 얻었다. 또한, 향후, 시스템 의 지능화를 위해서 교통사건에 의한 교통량변화 모델링을 위한 기본적인 사항들을 연구, 이에 관해 기술하였다. 제안 시스템의 성능 개선 및 지능화, 실제 적용을 위해 계속적인 연 구를 진행 중에 있으며, 이를 통해 미비점이 좀 더 보완되면 기존 무선 통신망을 이용한 ATIS 구현의 좋은 사례가 될 것으로 사료된다.

• The Journal of the Korea institute of electronic communication sciences
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• v.11 no.4
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• pp.373-378
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• 2016

Since the KTX starts operation in 2004, Korean railway system has sustained the highest safety and accuracy. In order to keep this achievement, the LTE based wireless communication system has been introduced for mobile communications and signal transmission. railway, and activities for its standardization are on the way. Railway communication system will be used as part of national safety net through interworking with safety network. This paper reviews the contents of standards and technologies in an LTE-based railway communication(LTE-R) system, and the items to be standardized to improve operational efficiency of the railway system by building a national railway radio communication system.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2015.07a
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• pp.325-327
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• 2015

최근 국제적으로 e-Navigation이 추진되고 있으며, 이는 국제적으로 표준화된 정보 제공 및 결합을 통하여 해상에서 항해를 안전하고 효율적으로 하는데 목적이 있다. 그리고 국내에서는 자체적인 VTS 기술개발 시스템이 없어 외산장비를 구축 활용하여 왔으며, e-Navigation 진화, 장비간 연계 등에 어려움이 있어 왔다. 최근 국내에서도 VTS 시스템에 대한 국산화 기술개발이 진행되고 있으며, 시스템 기능개발을 어느 정도 완료하고 성능과 독자적인 기술개발을 고려하고 있다. 따라서 현재 국내에서 추진되고 있는 국산화 기술개발에 대한 현황을 확인하고 보완할 내용에 대하여도 검토하고자 한다. 특히 국산화 시스템은 e-Navigation 진화를 위한 기술적 내용을 포함하지 않아 향후 진화에 어려움이 있을 수 있으며, 외산장비와 국산화 장비 시스템간 정보교환 문제 또한 고려되어야 한다. 따라서 실제적 국제적인 VTS 고도화 시스템으로 진화하기 위해서는 시범 서비스를 통한 운용성 확보 그리고 시스템간 연동을 위한 추가설계와 구축시험 및 빅데이터 처리를 위하여는 센터간 연계 통합화 노력이 요구된다. 즉, 향후 국내의 VTS운용 시스템이 다양한 외산장비가 입찰에 낙찰되어 도입구축 운용되는 경우에도 같은 상황으로서 반드시 효율적인 연계 방안으로 수립되어야 한다. 이는 국가적으로도 VTS 시스템이 매우 중요하고 그 서비스의 안전성이 보장되어야 하며, e-Navigation 서비스 도입을 위하여 VTS 국산화 및 고도화가 반드시 고려되어야 한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38C no.4
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• pp.344-350
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• 2013

It is essential to consider geometry in the early design stage for rational design decisions. However, a crucial decision had been taken by conversation, physical model, and gesture rather than BIM mode which can analyze geometry efficiently. This research proposes the framework of interaction between BIM model and physical model for real-time BIM analysis. Through this real-time system framework of two models, architects can adopt BIM data at early design stage to review analysis of BIM model. It should facilitate dynamic design based on rich BIM information from an early stage to a final stage.