• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권2호
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• pp.1057-1069
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• 2017

The applications of Wireless Sensor Networks (WSN) are progressively adopting for various smart home services such as home automation, controlling smart home household appliances, constrained application services in a smart home, etc. However, enabling a seamless and ubiquitous WSN communication between the smart home appliances is still a challenging job. Therefore, in this paper, we propose a smart home control system using an Actuator based ZigBee networking (AZNET). The working of the proposed system is further divided into three phases, 1) an interference avoidance system is adopted to mitigate the effect of interference caused due to the co-existence of IEEE 802.11x based wireless local area networks (WLAN) and WSN, 2) a sensor-based smart light control system is used to fulfill the light requirement in the smart home using the sunlight with light source, and 3) an autonomous home management system is used to regulate the usage time of the electronic appliances in the smart home. The smart is tested in real time environment to use the sunlight with light sources in a various time of the day. Similarly, the performance of the proposed smart home is verified through simulation using C# programming language. The results and analysis revealed that the proposed smart home is less affected by the interference and efficient in reducing the energy consumption of the appliances available in the smart home scenario.

• 시스템엔지니어링학술지
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• 제1권2호
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• pp.49-55
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• 2005

The Smart UAV Program was motivated by a huge potential market, a various application and future core technologies. The Smart UAV system is defined as the advanced air vehicle with the smart technology such as collision awareness and avoidance, healthy monitering and self-recovering, intelligent active control. Due to the broad interest by government, industry and academia, Smart UAV development center and government steering committee were established. The organization of the Smart UAV program consists of domestic/international companies and academia. In this paper, the process and application of system engineering was introduced for Smart UAV development program.

• 스마트미디어저널
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• 제3권2호
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• pp.37-42
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• 2014

본 논문에서는 갑작스런 전력난이나 피크 전력시간 등의 비상 전력상황에서 필수적으로 동작해야 할 정보기기기가 전력을 공급받기 위해 우선순위(Priority) 제어기능을 부여한 스마트 플러그 기반의 스마트 콘센트에 의한 스마트 모니터링 및 표시장치를 갖는 스마트 미디어 플랫폼의 제어기능 설계를 제안한다. 이러한 스마트 게이트웨이는 에너지 저장장치(ESS, Energy Storage System)와 연동함으로서 스마트 플러그가 양방향 송배전과 우선순위 제어형 스마트 제어모듈에 의한 전력관리 효율을 극대화할 수 있다.

• 대한전자공학회논문지TC
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• 제47권1호
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• pp.43-52
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• 2010

본 논문에서는 스마트 안테나 기능을 지원하는 mobile-WiMAX 시스템을 구현하였고, 기존의 단일 안테나 m-WiMAX 시스템과 성능을 비교하는 실험을 하였다 스마트 안테나 기능을 지원하는 m-WiMAX 시스템을 구현하기 위해 여러 고려 사항이 있다. 그 중에 스마트 안테나 방식의 특성상 심볼 동기 획득, 빔형성, 캘리브래이션을 특히 잘 구현 해야만 원하는 성능의 스마트 안테나 기지국을 구현할 수 있다. 본 논문에서는 위의 3가지를 구현하였고 3가지가 제대로 구현되었을 때 스마트 안테나 시스템이 단일 안테나 시스템보다 성능이 우수하다는 것을 검증하였다. 4 배열 안테나의 환경에서 스마트 안테나 시스템은 데이터 산출량 관점에서 단일안테나 시스템보다 5.5dB의 성능향상을 실험을 통해 확인할 수 있었고 이는 이론적인 수치인 6dB와 거의 일치하는 결과 이다.

• International journal of advanced smart convergence
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• 제9권2호
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• pp.157-163
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• 2020

Recently the blockchain technology has been actively studied due to its great potentiality. The smart contract is a key mechanism of the blockchain system. Due to the short history of the smart contract, many issues have not been solved yet. One main issue is vulnerability and another main issue is cost optimization. While the vulnerability of smart contract has been actively studied, the cost optimization has been rarely studied. In this paper, we propose two cost optimization methods for smart contracts running on the blockchain system. Triggering a function in a smart contract program code may require costs and it is repeated continuously. So the minimization of costs required to trigger a function of smart contract while maintaining the performance equally is very important. The proposed two methods minimize the usage of expensive permanent variables deployed on the blockchain system. We apply the proposed two methods to three prevalent blockchain platforms: Ethereum, Klaytn and Tron. Evaluation experiments verify that the proposed scheme significantly reduces the costs of functions in the smart contract written with Solidity.

• Journal of Electrical Engineering and Technology
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• 제10권1호
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• pp.102-108
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• 2015

This paper proposes a new fault isolation methodology for a smart protective device which plays an agent role on the smart grid distribution system with the distributed generation. It, by itself, determines accurately whether its protection zone is fault or not, identifies the fault zone and separates the fault zone through the exchange of fault information such as the current information and the voltage information with other protective devices using bi-directional communication capabilities on the smart grid distribution system. The heuristic rules are obtained from the structure and electrical characteristics determined according to the location of the fault and DG (Distributed Generation) when faults such as single-phase ground fault, phase-to-phase short fault and three-phase short fault occur on the smart grid distribution system with DG.

• 한국전자통신학회논문지
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• 제6권4호
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• pp.589-594
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• 2011

스마트 폰 또는 홈 네트워크 기술은 지속적으로 부가가치를 창출할 수 있는 기술로, 삶의 질을 한층 더 높게 만들어 준다. 본 논문에서는 스마트 폰을 통해 스마트 홈을 제어 하는 시스템을 설계 및 구현하였다. 구현된 스마트 홈 시스템은 홈 노드 구조물, 원격 스마트 응용 시스템, 홈 서버 제어 시스템으로 구성된다. 홈 노드 구조물은 침입 감지, 가스 검출 및 밸브 제어, 도어 락, 자동커튼, 환풍기 제어 및 On/Off 제어 모듈로 구성되어 있으며 모듈들은 홈 서버에 의해서 제어 된다. 홈 서버는 사용자가 직접 제어할 수 있는 사용자 인터페이스와 스마트 폰을 이용하여 원격 제어할 수 있는 원격 인터페이스를 제공함으로써 언제 어디서나 편리하게 홈 자동제어시스템을 제어할 수 있다.

• International journal of advanced smart convergence
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• 제9권2호
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• pp.8-19
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• 2020

We see an energy fucused smart city evolution of the UK along with the project of "Smart London Plan (SLP)." A theoretical logic of business model innovation has been discussed and a research framework of evolving energy focused smart city is formulated. The starting point is the silo system. In the second stage, the private investment in smart meters establishes a basement for next stages. As results, the UK's smart energy sector has evolved from smart meter installation through smart grid to new business models such as water-energy nexus and microgrid. Before smart meter installation of the government, the electricity system was centralized. However, after consumer engagement plan has been set to make them understand benefits that they can secure through smart meters, the customer behavior has been changed. The data analytics firm enables greater understanding of consumer behavior and it helps energy industry to be smart via controlling, securing and using that data to improve the energy system. In the third stage, distribution network operators (DNOs)' access to smart meter data has been allowed and the segmentation starts. In the fourth stage, with collaboration of Ofwat and Ofgem, it is possible to eliminate unnecessary duplication of works and reduce interest conflict between water and electricity. In the fifth stage, smart meter and grid has been integrated as an "adaptive" system and a transition from DNO to DSO is accomplished for the integrated operation. Microgrid is a prototype for an "adaptive" smart grid. Previous steps enable London to accomplish a platform leadership to support the increasing electrification of the heating and transport sector and smart home.

• 한국정보통신학회논문지
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• 제25권1호
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• pp.124-133
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• 2021

스마트팩토리는 공장 내 장비에 센서를 부착하여 각종 데이터를 실시간으로 수집, 분석 및 모니터링함으로써 스스로 공정을 제어 및 통제하는 미래형 공장이다. 스마트팩토리에서 장비의 상태 및 이력을 현장에서 실시간으로 조회 및 생성하는 것은 매우 중요한 일이며 다양한 스마트 기기의 등장은 이것을 보다 효율적으로 수행할 수 있게 하고 있다. 본 논문은 실시간으로 장비의 상태 및 이력을 생성, 조회, 삭제 할 수 있는 다중장치 기반 시스템을 제안한다. 제안 시스템은 공장이라는 특수한 환경을 고려하여 안드로이드 시스템과 스마트 글래스 시스템을 동시에 사용한다. 스마트 글래스 시스템은 장비 인식을 위해 QR코드를 이용하였으며 음성 인식 기능을 이용하여 보다 효율적인 작업환경을 제공한다. 다중장치기반 실시간 장비 모니터링을 위한 시스템 구조를 설계하였으며 안드로이드 시스템, 스마트 글래스 시스템 및 웹 애플리케이션 서버를 구현함으로써 실용성을 보이겠다.

• 대한안전경영과학회지
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• 제13권2호
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• pp.31-42
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• 2011

Smart-Phones are utilized in disaster management field because it can deliver disaster information to large population simultaneously and quickly, and provide accurate information through situation-based service using the LBS(Location Based Service). To study on the utilization of smart phone for disaster information collection and dissemination method, this study suggest a framework which connects smart phone by loading application for reporting disaster. The disaster monitoring and situation dissemination system framework using smart phone is composed of 4 parts. First, smart phone application enters image, video, voice and text information and location of the disaster. Second, the disaster report reception and situation dissemination server receives the information, save in the DB, and send through smart phone SMS. Third, store into disaster information database. Fourth, display the disaster report and management information on 2D GIS, support the decision making process in deciding whether to manage as disaster, and disaster management web service which disseminates situation.