• Electronics and Telecommunications Trends
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• v.11 no.2 s.40
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• pp.99-118
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• 1996

전세계는 소위 21세기 정보사회 진입을 향한 각종의 정보 기반구조 건설을 추진중에 있으며 국제표준화 기구를 비롯한 지역별, 국가별 표준화 기관들은 상호 연동환경 보장 및 적기 표준 공급을 위한 GII(Global Information Infrastructure) 표준화 추진계획을 발표하고 있다. 본 고에서는 ITU-T를 비롯한 ETSI(European Telecommunication Standards Institute), T1 Committee, TTC(Telecommunication Technology Council), GSC(Global Standards Collaboration) 등의 GII 표준화 활동현황을 기술하고, 초고속 정보통신 기반구축을 위한 표준화의 중요성 및 우리의 대응방안을 살펴보고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04b
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• pp.1459-1462
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• 2002

3GPP(Third Generation Partnership Project)와 3GPP2 등의 국제 표준화 기구에서는 초기 IMT-2000 망 구조로부터 All IP 망으로 진화할 것으로 예상하고 있다. 이에 본 논문에서는3GPP와 3GPP2를 중심으로 All IP 망의 기존에 제시된 All IP 망의 진화 시나리오를 분석하고, 이를 바탕으로 기존 PSTN/ISDN 연동, VoIP, Mobile IP 등과 같은 새로운 기술, 기존회선 모드 단말기 수용 등을 고려한 All IP 진화 시나리오에 따른 단계별 망 구조를 제시한다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.38 no.11
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• pp.1215-1220
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• 2014

Breaking time is an important performance indicator of a circuit breaker. Thus, the operating mechanism of the circuit breaker should be optimized for reducing the breaking time. The operating mechanism in a gas circuit breaker is made up of several latches. Specifically, the geometry and relative positions of latches influence the dynamic behaviors of the operating mechanism. In this study, a three-stage latch operating mechanism is analyzed on the basis of the verified multibody dynamics model constructed using the MSC.ADAMS program. The relative positions and lengths of latches are selected as design variables. The dominant design variables are selected by a design study. Optimization is performed using a genetic algorithm (GA). The study results demonstrate that the performance of the circuit breaker improves by about 22.5.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2016.11a
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• pp.182-183
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• 2016

최근 UHDTV 방송의 대두와 함께 방송 부가 서비스에 대한 관심이 높아지고 있다. ATSC 3.0, HbbTV, IBB 등 각 방송 표준 기구로부터 부가서비스에 대한 표준이 공표되고 있으며, 이 표준들은 공히 Companion Screen에 대한 내용을 포함하고 있다. Companion Screen은 사용자가 TV를 통하여 시청하고 있는 컨텐츠에 대한 부가 정보를 사용자의 스마트폰/태블릿으로 표시할 수 있어 방송 기반의 개인화 서비스 구현방법으로 각광받고 있다. 본 논문에서는 이러한 Companion Screen과 IoT 기기의 연동을 통한 서비스 구성 방법을 제시한다. IoT는 최근 급격한 발전을 거듭하고 있으며 다양한 제품군의 출시도 지속적으로 이루어지고 있다. 이러한 IoT를 Companion Screen과 연계하여 활용함으로써, 방송과 통신을 연계하는 신규 서비스의 구성이 가능할 것으로 예상된다. 본 논문에서 제시하는 서비스 구성 기법은 방송에 내제된 부가 정보 기반의 IoT 제어를 Companion Screen을 통하여 구성할 수 있도록 한다.

• Proceedings of the Korean Society for Quality Management Conference
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• 2007.04a
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• pp.334-339
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• 2007

인터넷은, 전화로 대변되는 과거의 정보통신 서비스와는 달리 사회 전반에 막대한 영향력을 행사하는 서비스로 발전하였다. 인터넷에 대한 의존도는 향후 모든 정보통신서비스가 인터넷을 기반으로 제공되는 All-IP 디지털 컨버전스 시대에 더욱 더 심화될 것이다. 이 경우 오늘날의 인터넷보다도 QoS(Quality of Service)에 관한 이슈가 더욱 중요해질 것은 자명하다. 이러한 배경에서 ITU(International Telecommunication Union)나 IETF(Internet Engineering Task Force)등의 국제표준화 기구에서 차세대 인터넷 (Next Generation Network, NGN)에 대한 QoS 문제를 연구하고 있다. 그러나 이들 국제기구는 주로 기술공학적인 측면에서 QoS 문제에 접근하고 있어서 현실적으로 완전한 대안을 제공하지는 못하고 있다. 즉, 인터넷 산업의 특성상 사업자간 끊김없는 연동(seamless inter-operations)과 협력이 필수적인데, 이는 기술공학적 측면보다도 비즈니스 및 정책적 관점에서 다루어져야 되기 때문이다. 통신 사업자 및 벤더(vendor)의 글로벌 컨소시엄으로 출발한 TMF(TeleManagement Forum)나 QuEST Forum 등의 역할이 중요해지는 이유가 여기에 있다. 이미 이들 단체는 사업자간 합의에 의해 자발적으로 구축한 NGOSS 및 TL9000 인증시스템을 바탕으로, 망사업자를 비롯한 서비스공급자 및 벤더 등과의 원활한 협력관계를 구축하는 글로벌 de facto 표준을 마련한 바 있다. 본 연구에서는 QoS 보장을 목표로 하는 차세대 인터넷(NGN)의 현실적 성공 가능성을 높이기 위한 글로벌 표준화 노력을 소개하고 이들을 비교/검토한다. 특히, ITU 및 IETF 등의 NGN 개발계획을 비즈니스/정책점 관점에서 보완할 수 있는 TMF와 QuEST Forum의 접근법을 고찰하여, All-IP 컨버전스 환경에서의 QoS 이슈에 시사하는 바를 살펴본다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.12
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• pp.2232-2240
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• 2017

IMO has made AIS and VHF mandatory for international sailing vessels through SOLAS, and korea if mandating specific vessels through the law for safety of vessels and the ship installation technology standards. However, due to various communication equipments and complicated usage method, malfunction occurs, and the response delay to the actual structure signal often causes human accidents. So recently, as a part of GMDSS modernization, maritime communication devices are attempting to interwork and integrate different types of marine communication system in order to construct a next generation maritime communication system. In this paper, we describe a technique to implement the DSC function by interlocking and integrating the AIS device and VHF. We will present the basis for achieving domestic technical standards and standardization through the linking algorithm of the data that can extract the ship information from AIS and utilize it the DSC function of VHF.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.26 no.12C
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• pp.174-180
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• 2001

The technology to efficiently manage computer communication network is in need as the computer communication network becomes more complicated and users want services more diversified. This has brought industries, research institutes and standadization organizations to consider an effective network management protocol. CMIP and the SNMP have considerable differences in structure and capacity Therefore, it is essential to have enables differences between network management protocol to gear for the two communication management system which is the most widely used and will be continuously used. In this thesis we suggest an interworking function Integrated Network Management for the Design of Proxy. According to the suggest algorithm, by using scoping, it stores the management information, so that it may pass the related information at the inner cash efficiently. Therefore, we can not only reduce some unnecessary management operation considerably but also bring some efficiency of saving the total management system response time.

• Journal of the Korea Convergence Society
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• v.11 no.8
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• pp.147-152
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• 2020

The purpose of this study was to develop an auxiliary device useful for promoting continued participation in the golf among young golfers and female beginner-level golfers who were gradually increasing in number but often losing interest in the golf and gave up playing golf due to difficulty with posture, boredom from golf itself, slow improvement of skill, etc., in the process of learning the golf. For that, a hardware device fitted with various sensors was attached to the lower part of golf club grip to develop a platform capable of collecting and transmitting the data on each golfer's swing posture, driving distance, etc. If a smartphone app, which can analyze and store those data, is developed and synchronized, each golfer's postures can be identified and golfers can correct the posture on their own. Moreover, the smartphone app provides the contents for self-comparison and comparison with others and will be able to infuse the beginner-level golfers with internal motivation for continued participation in the golfing exercise if the game-type elements are added.

• Journal of Korean Society for Geospatial Information Science
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• v.20 no.2
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• pp.109-117
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• 2012

Recently, large-scale multi-hazards have been occurred in the various areas of the world. A variety of Earth observation sensors such as satellite EO, aerial and terrestrial LiDAR have been utilized for global natural disaster monitoring. Especially, commercial satellites which observe the Earth regularly and repeatedly, and acquire images with cm-level high spatial resolution enable its applications to extend in the fields of disaster management from advanced disaster monitoring to timely recovery. However, due to existing satellite operation systems with some limitations in almost real-time and wide regional disaster response, close international collaborations between satellite operating organizations like NASA, JAXA, KARI etc. have been required for collecting satellite images in time through a satellite platform with multi-sensors or satellite constellation. For responding domestic natural disaster such as heavy snowfall and extreme rainfall in 2011, this paper proposes a disaster management system for timely decision-making; rapid acquisition of satellite imagery, data processing, GIS analysis, and digital mapping through cooperation with NDMI in Korea and International Charter-Space and Major disasters.

• Journal of Korean Tunnelling and Underground Space Association
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• v.21 no.6
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• pp.887-895
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• 2019

Recently, the number of underground road development projects has been increasing to solve traffic problems in the national capital region and metropolitan areas with intensified overcrowding, and there has been a tendency to plan underground roads by applying a double-deck tunnel technology that has advantages in constructability and economical efficiency. The double-deck tunnel has a structure where one excavation section is divided into two parts and used as up and down lines, and is mainly used as a road for small vehicles only due to its low floor height. In addition, due to the small cross-sectional area, it has characteristics different from those of general road tunnels in terms of ventilation and disaster prevention. In this regard, this study proposed an operational plan that applies an oversized exhaust system, which is one of semi-transverse ventilation systems, to small cross-sectional tunnels like double-deck tunnel with low floor height, and a comparative analysis between smoke exhaust characteristics according to the fire occurrence locations and oversized exhaust systems was conducted using the Fire Dynamics Simulator (FDS). The results showed that unlike uniform exhaust, intensive smoke exhaust using the oversized exhaust port maximized the delay effect of smoke diffusion and limited the smoke within 50 m above and below the fire point.