• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2007년도 Proceedings of ISRS 2007
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• pp.584-586
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• 2007

3D virtual modeling such as creation of a cyber city or landscape, or making a 3D GIS requires realistic textures. Automatic texture extraction using close range images is not yet efficient or easy in terms of data acquisition and processing. In this paper, common problems associated with automatic texture extraction from aerial photographs are explored. The ZI-buffer, which has depth and facet ID fields, is proposed to remove hidden pixels. The ZI-buffer algorithm reduces memory burden and identifies visible facets. The correct spatial resolution for facet gridding is tested. Error pixels in the visibility map were removed by filtering.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.157-160
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• 2008

This study analyzed on the area of Samcheok, Kangwondo about forest fire alarming area and enlargement of the area. Then, visible area by unattended watching camera and watchtower for forest fire which were run by Samcheok was cross-checked with geographic information system, and it could be whether effective on watching the area where the forest fire risk was high enough and also it could be expanded to larger forest fire. The result of study, the visible area by watching facilities only holds for 13.4% of the whole forest fire alarming area, but the forest fire can be observed even though it is occurred in small valley because of smoke and all the forest fire have been occurred in daytime. Therefore, it can be determined that watching area will be extended around 50.3% while the observation radii of watching facilities raise by 4km. However, Samcheok has much greater area of mountain area in compared to any other cities or counties, watching facilities should be installed and run additionally for extinguishing the forest fire from the beginning.

• 한국안전학회지
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• 제23권5호
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• pp.1-6
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• 2008

`SOS', Simulator Of Safety assessment for fire, was developed to simulate fire safety assessment for a structure which is geometrically complex. The program(SOS) is intended to use for searching as well as designing tools to analyse the evacuation safety through a wide range of structure conditions. The computer program has a function which importing FDS's calculating results to each individual resident in the structure. These attributes include a walking speed reduction by producing visibility reduction for each person on the fire. $A^*$ pathfinding algorithm is adopted to calculate the simulation of escape movement, overtaking, route deviation, and adjustments individual speeds in accordance with the proximity of crowd members. This SOS program contributes to a computer package that evaluates the fire safety assessment of individual occupants as they walk towards, and through the exits especially for building, underground spaces like a subway or tunnel.

• 대한안전경영과학회지
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• 제19권4호
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• pp.183-188
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• 2017

Block Chain is a technology that records and shares distributed ledgers without a central authority, providing a decentralized platform for transparent transactions in the business and enhancing transparency and traceability in all transactions to ensure trust in the transaction. Despite initial doubts about this technology, it is committed to adopting, adapting and improving the technology in a wide range of industries, including finance, government, security, logistics, food, medical, legal, and real estate. This study examines this technology, its applicability and potential benefits to the manufacturing supply chain. A tracking system of manufacturing supply chain to visualize transparency and traceability is implemented, and the conditions for adopting the technology in the manufacturing supply chain and the issues to be addressed are discussed.

• Journal of information and communication convergence engineering
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• 제17권3호
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• pp.198-204
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• 2019

In this study, the author introduces a supply-chain management (SCM) solution that connects suppliers, manufacturers, customers, and other companies within a transactional relationship to enable efficient inventory management and timely product supply, which ultimately maximizes corporate profits. This proposed solution exploits Fourth Industrial Revolution technologies, such as artificial intelligence (AI) and the Internet of Things (IoT), which provide solutions to complex management issues generated by the broader market. The goal of the current study was to develop an advanced and intelligent smart SCM solution that complies with logistics standards, to enhance the visibility, safety, and efficiency of a supply chain made up of manufacturers and suppliers. This smart SCM solution aims at maximizing corporate profits through efficient inventory management and timely supply of products, and solves the complex management problems caused by operating within a wide range of markets.

• International Journal of Computer Science & Network Security
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• 제21권12호
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• pp.93-100
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• 2021

Satellite communication for high altitude platform stations (HAPS) and geostationary orbit (GEO) systems suffers from sand and dust (SANDU) storms in desert and arid regions. The focus of this paper is to propose common relations between HAPS and GEO for the atmospheric impairments affecting the satellite communication networks operating above Ku-band crossing the propagation path. A double phase three-dimensional relationship for HAPS and GEO systems is then presented. The comparison model present the analysis of atmospheric attenuation with specific focus on sand and dust based on particular size, visibility, adding gas effects for different frequency, and propagation angle to provide systems' operations with a predicted vision of satellite parameters' values. Thus, the proposed system provides wide range of selecting applicable parameters, under different weather conditions, in order to achieve better SNR for satellite communication.

• 한국항공우주학회지
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• 제40권1호
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• pp.49-60
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• 2012

합성 개구면 레이다(SAR: synthetic aperture radar)는 날씨 및 주 야간에 관계없이 고해상도의 영상을 형성할 수 있기 때문에 다양한 분야에서 활용되고 있다. 본 논문에서는 고해상도 SAR 설계시 경사거리와 합성개구면의 길이가 영상형성에 미치는 영향을 RMA 시뮬레이터를 이용하여 성능분석을 수행하였다. 형성된 영상의 성능은 직접 육안으로 확인할 수 있었으나, 영상을 분석하는 수치로서도 성능평가가 가능하였다. 보다 구체적으로, 다양한 경사거리와 합성개구면의 길이 변화와 영상획득을 위한 기하구조에 따라 이상적인 점표적에 대한 시뮬레이션의 원시 데이터를 생성하였고, Spotlight 영상 형성 알고리듬을 이용하여 이에 따른 점표적 응답특성의 공간 해상도, 최대 부엽 수준, 누적 부엽 수준에 대한 성능분석을 수행하였다.

• 한국지리정보학회지
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• 제16권3호
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• pp.54-67
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• 2013

본 연구는 근대 대구시를 대상으로 가시권분석과 토지이용현황을 분석하고 GIS를 활용하여 이를 중첩시킴과 동시에 3D 시뮬레이션으로 투시도를 작성하여 근대 대구시의 조망경관 특성을 분석하였다. 근대 대구시의 경관특성은, 가시권역에 포함된 토지이용에서 산림의 비율이 매우 높다는 점이다. 특히, 서쪽의 와룡산, 북쪽의 함지산 및 학봉, 남쪽의 앞산 등 높은 산지와 더불어 서부침식저지와 동부구릉지 및 침식저지에 형성된 산림이 낮은 구릉지 형태로 존재하고 있어서 어디에서나 산림이 조망 가능하며, 시점 주변에 농지가 분포하고 있어서 시점에서 주위 산을 조망할 때, 시야 확보가 가능하고 농지-산림으로 이어지는 자연환경 요소에 의해 연속적인 조망경관이 형성되었다. 또한, 주요 조망대상은 조사구역의 경계를 형성하고 있는 산지이며, 성내에서 경계를 형성하고 있는 산지까지의 내부공간에는 주변지역보다 표고가 높고 산림으로 구성된 조망대상이 위치하고 있어서 성내를 중심으로 서쪽, 남쪽, 북쪽 방향으로 이중구조를 지니고 있으며, 이로 인하여 중첩경관(重疊景觀)이 형성되어 있다.

• 방송공학회논문지
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• 제15권1호
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• pp.29-39
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• 2010

본 논문에서는 ATSC (Advanced Television Systems Committee) 지상파 디지털 TV 방송 방식에서의 분산 주파수 망(distributed frequency network)을 위해 개발된 분산중계기(Distributed Translator: DTxR)에 대한 실험실 테스트 결과를 기술하고, 그 결과를 분석한다. DTxR 실험실 테스트는 수신부 테스트와 송신부 테스트로 구분된다. DTxR 수신부 테스트는 dynamic range, 랜덤 잡음, 단일 에코, 인접채널 신호의 간섭 테스트 등을 포함하고, DTxR 송신부 테스트는 출력신호의 품질(대역외 방사, 송신 품질, 위상잡음), 출력신호들의 주파수 일치, TxID (Transmitter Identification) 신호가 상용 수신기에 미치는 영향 평가 등을 포함한다. 실험실 테스트 결과에 의하면, DTxR 수신부는 0~17 us 범위 내의 평균 -2.5 dB의 단일 에코 신호를 제거하며, 랜덤 잡음에 대한 TOV (Threshold of Visibility)는 평균 17.5 dB이다. 또한, DTxR 송신부 출력 신호는 미국의 FCC (Federal Communications Commission) 규격을 만족하며, DTxR 출력신호들의 주파수 차이는 0.001 Hz 보다 작다.

• 한국전기전자재료학회논문지
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• 제28권6호
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• pp.408-413
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• 2015

Road lighting has emerged in importance as an essential system to secure safety and visibility for drivers and pedestrians. According to the Road Lighting Standards (KS A 3701), the luminance uniformity (U0) should be 0.4, the luminance uniformity for lanes (UI) should be 0.5, and a threshold increment (TI) of 10% should be satisfied. In this study, we conducted simulations using the Relux program in which the secondary optical lens was applied to a 21 W engine. Ten LED engines were installed on a two-way four-lane road, and the simulation result satisfied the requirements with U0 0.47, UI 0.63 and TI 8%. The U0, UI, and TI were compared with the angle of the LED streetlight varied in the range of $9^{\circ}{\sim}15^{\circ}$ with $0.5^{\circ}$ intervals. The range was selected as ${\pm}25%$ of the standard inclination angle of $12^{\circ}$ according to the Road Lighting Standard. The U0 was high and the UI and TI were low when the tilting angle was in the range of $9.5^{\circ}{\sim}10.5^{\circ}$. Consequently, an optimum-design of lighting distribution was obtained for the concrete two-way four-lane road when the inclination angle was $9^{\circ}$.