• 대한안전경영과학회지
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• 제14권4호
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• pp.211-218
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• 2012

In this paper, we propose a system architecture of the AMI to be applied in the modern agricultural sector. Agricultural electricity costs in South Korea is very inexpensive compared with other industries. It is expected to increase oil prices to rise over the medium to long term so the facilities must to be installed for farmers in terms of energy savings and energy costs. The research and development of plant factory which can replace the ills of modern agriculture is very active. The technologies of smart grid and plat factory are good paradigm of next generation agricultural sector. Good use of smart grid technologies, the traditional energy consumption industries, agriculture sector can be self-sufficiency industry. In this article the AMI architecture is developed and it will be applicable for modern farmers plant factory.

• 해양환경안전학회지
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• 제30권3호
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• pp.263-274
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• 2024

The digitization of ship environments has increased the risk of cyberattacks on ships. The smartization and automation of ships are also likely to result in cyber threats. The International Maritime Organization (IMO) has discussed the establishment of regulations at the autonomous level and has revised existing agreements by dividing autonomous ships into four stages, where stages 1 and 2 are for sailors who are boarding ships while stages 3 and 4 are for those not boarding ships. In this study, the level of a smart ship was classified into LEVELs (LVs) 1 to 3 based on the autonomous levels specified by the IMO. Furthermore, a risk assessment for smart ships at various LVs in different risk scenarios was conducted The cyber threats and vulnerabilities of smart ships were analyzed by dividing them into administrative, physical, and technical security; and mitigation measures for each security area were derived. A total of 22 cyber threats were identified for the cyber asset (target system). We inferred that the higher the level of a smart ship, the greater the hyper connectivity and the remote access to operational technology systems; consequently, the greater the attack surface. Therefore, it is necessary to apply mitigation measures using technical security controls in environments with high-level smart ships.

• Nuclear Engineering and Technology
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• 제41권1호
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• pp.53-62
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• 2009

A set of experiments has been conducted on the performance sensitivity of the passive residual heat removal system (PRHRS) for an advanced integral type reactor, SMART, by using a high temperature and high pressure thermal-hydraulic test facility, the VISTA facility. In this paper the effects of the opening delay of the PRHRS bypass valves and the closing delay of the secondary system isolation valves, and the initial water level and the initial pressure of the compensating tank (CT) are investigated. During the reference test a stable flow occurs in a natural circulation loop that is composed of a steam generator secondary side, a secondary system, and a PRHRS; this is ascertained by a repetition test. When the PRHRS bypass valves are operated 10 seconds later than the secondary system isolation valves, the primary system is not properly cooled. When the secondary system isolation valves are operated 10 or 30 seconds later than the PRHRS bypass valves, the primary system is effectively cooled but the inventory of the PRHRS CT is drained earlier. As the initial water level of the CT is lowered to 16% of the full water level, the water is quickly drained and then nitrogen gas is introduced into the PRHRS, resulting in the deterioration of the PRHRS performance. When the initial pressure of the PRHRS is at 0.1MPa, the natural circulation is not performed properly. When the initial pressures of the PRHRS are 2.5 or 3.5 MPa, they show better performance than did the reference test.

• 한국인터넷방송통신학회논문지
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• 제23권6호
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• pp.163-170
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• 2023

중대재해 처벌 등에 관한 법률의 등장으로 사업주와 경영책임자 및 법인 등은 산업현장에서 안전사고를 예방하기 위해 안전관리자를 대폭 늘리고, ISO 취득 등 많은 투자와 노력을 하고 있다. 또한 SSMS(Smart Safety Management System)을 도입하여, 인원의 관리 및 안전보호구의 관리 또한 진행되고 있다. 작업자의 생명을 보호하는 안전보호구에서 안전모, 안전고리, 안전복에는 IoT 기반의 관리 시스템이 적용되고 있지만 안전화의 경우 현장 관리자와 개인에게 맡겨지고 있고 여전히 안전사고에 취약한 상황이다. 이에 따라 본 연구에서는 현장 출입 시 작업자의 안전화 또한 착용 여부를 사전에 파악할 수 있도록 Raspberry PI 기반의 Sensor 인식 장비를 구현해 착용 여부를 확인하고 안전화 미착용으로 발생될 수 있는 사고를 예방하는 것을 목표로 한다.

• 한국안전학회지
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• 제20권2호
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• pp.32-37
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• 2005

The purpose of this study is for the sensitivity study f9r a Steam Generator Tube Rupture (SGTR) of the System-integrated Modular Advanced ReacTor for a Pilot (SMART-P) plant. The thermal hydraulic analysis of a SGIR for the Limiting Conditions for Operation (LCO) is performed using TASS/SMR code. The TASS/SMR code can calculate the core power, pressure, flow, temperature and other values of the primary and secondary system for the various initiating conditions. The major concern of this sensitivity study is not the minimum Critical Heat Flux Ratio(CHFR) but the maximum leakage amount from the primary to secondary sides at the steam generator. Therefore the break area causing the maximum accumulated break flow is researched for this reason. In the case of a SGIR for the SMART-p, the total integrated break flow is 11,740kg in the worst case scenario, the minimum CHFR is maintained at Over 1.3 and the hottest fuel rod temperature is below 606"I during the transient. It means that the integrity of the fuel rod is guaranteed. The reactor coolant system and the secondary system pressures are maintained below 18.7MPa, which is system design pressure.

• International journal of advanced smart convergence
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• 제6권1호
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• pp.82-88
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• 2017

Emergency lights and exit signs are an indispensable part of safety precautions for effective evacuation in case of emergency in public buildings. These emergency sign indicates safe escape routes and emergency doors, using an internationally recognizable sign. However visibility of those signs drops drastically in case of emergency situations like fire smoke, etc. and loss of visibility causes serious problems for safety evacuation. This paper propose a novel emergency light and exit sign built-in with Bluetooth Low Energy (BLE) Beacon to assist the emergency self-guiding evacuation using devices for crisis and emergency management to avoid panic condition inside the buildings. In this approach, the emergency light and exit sign with the BLE beacons deployed in the indoor environments and the smart devices detect their indoor positions, direction to move, and next exit sign position from beacon messages and interact with map server in the Internet / Intranet over the available LTE and/or Wi-Fi network connectivity. The map server generate an optimal emergency exit path according to the nearest emergency exit based on a novel graph generation method for less route computation for each smart device. All emergency exit path data interfaces among three system components, the emergency exit signs, map server, and smart devices, have been defined for modular implementation of our emergency evacuation system. The proposed exit sign experimental system has been deployed and evaluated in real-time building environment thoroughly and gives a good evidence that the modular design of the proposed exit sign system and a novel approach to compute emergency exit path route based on the BLE beacon message, map server, and smart devices is competitive and viable.

• 대한임베디드공학회논문지
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• 제6권1호
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• pp.25-31
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• 2011

LEDs are becoming the most suitable candidate replacing traditional fluorescent street-light lamps because of its energy efficiency and high brightness. Furthermore, most countries are urging to pursue energy savings in conjunction with IT and sensor network. In order to conserve energy of LED lamp and ensure the safety of pedestrian, we propose a new smart control method for LED light system based on USN using compound sensors, such as illuminance, motion, temperature and humidity sensor. An elaborate simulation shows that the proposed system with a smart control based switching can reduce the energy by 40%, compared to the previous street-light system with a fixed time based switching.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2004년도 춘계 학술발표회 제16권1호
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• pp.428-431
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• 2004

Smart structural system is defined as structural system with a certain-level of autonomy relying on the embedded functions of sensors, actuators and processors, that can automatically adjust structural characteristics, in response to the change in external disturbance and environments, toward structural safety and serviceability as well as the extension of structural service life. In this study, carbon and glass hybrid fiber materials were investigated fundamentally for the applicability of self diagnosis in smart concrete structural system as embedded functions of sensors.

• 한국재난정보학회 논문집
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• 제15권1호
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• pp.39-48
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• 2019

연구목적:본 연구에서는 재난현장 또는 산업현장에 투입되는 고위험 직업군의 안전을 위하여 IoT/ICT 융합기반의 스마트 안전관리 시스템을 연구하고 이의 성능을 분석 제시하였다. 연구방법: 연구에서 제시된 고위험 직업군의 안전을 위해 부동상태 감지센서, 각 대원간에 통신을 위한 LoRa기반의 리피팅 기술, 전체를 모니터링할 수 있는 LoRa Gateway를 개발하여 기능을 테스트하여 현장적용을 위한 기반을 제시하였다. 연구결과 :고위험 직업군에 작업현장에서 작업자의 위험 상태를 감지하고 전파할 수 있는 다양한 요소를 파악하고 이에 대한 연구가 진행되었다. 작업자의 부동과 같은 위험상태를 감지하는 센서기술, LoRa 통신 기반의 리티핑 기술, 위험 상황을 실시간으로 모니터링 할 수 있는 LoRa Gateway를 분석하여 그 연구결과를 제시하였다. 특히 통신 음영지역의 최소화를 위한 단말간 리피팅기술을 연구하여 통신 불통 문제를 감소시켰다. 연구결론:본 연구를 통해 다양한 고위험 직업군의 작업자 안전을 위한 스마트 안전관리 시스템의 중요한 기능적 요소를 고찰하고 그 효용성을 검증하였다.

• 한국항행학회논문지
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• 제21권1호
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• pp.126-131
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• 2017

본 논문은 오래된 옹벽과 같은 건축물이나 잠재적 위험을 내재한 건설 및 토목 구조물 등에 부착 가능한 블루투스 비콘 센서 노드를 활용하여 위험감지 및 대피/대처 서비스를 제공해줄 수 있는 스마트 안전 계측 시스템을 설계한다. 제안한 시스템은 블루투스 비콘을 활용하여 비콘이 설치된 지점의 가속도, 자이로, 지자계, 압력/고도, 온도/습도 등의 다양한 센서 데이터를 전송할 수 있으며 이러한 데이터를 활용하여 위험 감지, 예측, 경고 등의 다양한 서비스에 활용할 수 있다. 제안한 시스템의 실효성을 검증하기 위해 필드 테스트를 수행하였으며 옹벽의 변위값이 허용변위 38.5 mm 내에 존재한다는 것을 확인하였다.