• Journal of Satellite, Information and Communications
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• v.6 no.2
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• pp.131-135
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• 2011

In this paper, we describe the design and implementation of wireless smart plug having AC power sensor and intelligent standby power control algorithm for energy sensor network. The adaptive standby power control algorithm has function to apply different threshold of standby power by using learning algorithm depending on electric equipments. As using the proposed algorithm, user convenience will be more better and power consumption can be more reduced. The implemented prototypes of wireless smart plug and wireless access point were tested to verify the required functions and performance. As a result, we confirmed practicality of wireless smart power sensor and satisfaction of given design specifications.

• Smart Media Journal
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• v.5 no.1
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• pp.55-60
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• 2016

Mobility of the sensor networks proposed a new way to the efficient design of sensor networks and improvement of network system performance. Mobility results in a number of functional changes in the MAC protocol and routing protocol. Especially, the mobility of the nodes may occur the increase of the overhead of transmission or disconnection of the link. Therefore, the study of the energy efficient transmission is very important in mobile sensor networks. This paper proposed adaptive transmission mechanism on the distance-based power control. The proposed mechanism was analyzed better than conventional method in the average energy consumption and network life by simulation results.

• Transactions of the Korean hydrogen and new energy society
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• v.33 no.4
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• pp.293-300
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• 2022

The Changwon city which announced 2040 hydrogen policy vision is planning to establish the new hydrogen-centered city. The building of plant which is available to produce the 5 ton/day of liquid hydrogen is promoted as one of the projects in order to achieve the vision. However, the analysis in terms of local economic and environmental aspects is insufficient because this liquid hydrogen plant is the first in Korea. Therefore, in this study, the financial feasibility of the liquid hydrogen plant project was analyzed by reviewing the benefits of liquid hydrogen supply and environmental improvement, and the feasibility of this project has been investigated which is being built based on the hydrogen industrial plan of Changwon city.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.1154-1157
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• 2011

최근 급속도로 확산되고 있는 스마트폰 기반의 SNS(Social Network Service)들은 정보수집 및 의사소통, 혹은 엔터테인먼트 기능 제공을 통해 사용자에게 유용한 도구로 자리 잡고 있다. 본 논문에서는 홈 네트워크 기반의 에너지 관리 시스템을 이용하여 사용 그룹간의 경쟁심을 유발할 수 있는 모바일 SNS를 설계하고자 한다. 이를 위해, 소셜미디어의 기능 블럭을 토대로 에너지 관리를 위한 서비스 요구사항을 정의하고, 에너지 절약을 유도할 수 있는 모니터링 요소를 추출하여 그룹 간에 에너지 소비량을 실시간으로 공유할 수 있는 SNS를 설계한다. 이는 단순한 정보의 확산 및 수집을 목적으로 사용하는 SNS가 아닌, 장기적인 경제효과와 에너지 절약이라는 공익성까지 갖춘 새로운 목적의 SNS 개발을 의미한다.

• The Journal of the Korea institute of electronic communication sciences
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• v.16 no.1
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• pp.61-68
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• 2021

The application of renewable energies such as wind and solar has become an inevitable choice for many countries in order to achieve the reduction of greenhouse gases and healthy economic development. However, due to the intermittent characteristics of renewable energy, the issue with integrating a larger proportion of renewable energy into the grid becomes more prominent. A complex energy system, usually consists of two or more renewable energy sources used together to provide increased system efficiency as well as greater balance in energy supply. Compared with the power system, control and optimization of the complex energy system become more difficult in terms of modeling, operation, and planning. The main purpose of the complex energy system retrofit for samado island with microgrid system is to coordinate the operation with various distributed energy resources, energy storage systems, and power grids to ensure its reliability, while reducing the operating costs and achieving the optimal economic benefits. This paper suggests the improved complex energy system of samado island with optimal microgrid system. The results of test operation show about 12% lower SOC variation band of ESS, elimination of operation limit in PV and reduction of operation time in diesel generator.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.9
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• pp.1799-1807
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• 2016

In this paper, we propose the automatic demand response systems which reduce the electric power consumption for the period automatically distinct from the existing passive demand response that a subscriber directly controls the energy consumption. The proposed systems are based on SEP 2.0 and consist of the demand response management program, the demand response server, and the demand response client. The demand response program shows the current status of the electric power use to a subscriber and supports the function which the administrator enables to creates or cancels a demand response event. The demand response server transmits the demand response event received from the demand response management program to the demand response client through SEP 2.0 protocol, and it stores the metering data from the demand response client in a database. After extracting the data, such as the demand response the start time, the duration, the reduction level, the demand response client reduces the electric power consumption for the period.

• The Journal of the Korea institute of electronic communication sciences
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• v.6 no.6
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• pp.873-880
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• 2011

As environmental pollution, global warming, and exhaustion of fossil fuel become global issue recently, there has been strong research motivation to develop green energy technology. Along the same line of motivation, some research efforts have been put into the development of environment-friendly bicycle equipped with various smart energy technologies to increase the usability of the bicycle as short-distance transportation. Among the technologies related with new generation bicycle, PAS (power assist system) is one of the most important systems that are essential in efficiently integrating human power and the electrical power supplied by electric motor driven by battery. In this paper, a novel torque sensor technology which is core component for PAS is proposed. Unlike existing technologies, strain gauges are attached to rear shaft directly under the hub bearings, which eliminates the requirement of slip-ring, Furthermore, the sensor is able to not only measure the torque transmitted to driving axle by human but also estimate the position of the gear to which the chain is currently engaged.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.25 no.10
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• pp.1381-1390
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• 2021

Smart grid is a representative convergence new technology in the era of the 4th industry revolution that deals with three broad security areas consisting of control system, the power grid, and the consumer. As it is a convergence new technology of the 4th industrial society, it is true that it can have a positive effect on the country's technological development, growth engine, and economic feasibility in the future. However, since the smart grid is expected to cause enormous damage in the event of a security accident, energy-related organizations must prepare various security measures to predict and respond to the latest security incidents. In this paper, the current status of domestic and foreign smart grids, trends in security standards, vulnerabilities and threats, and prospects for smart grid security technologies are to be considered.

• Review of KIISC
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• v.24 no.5
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• pp.75-81
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• 2014

현재 우리나라는 2013년 제주 스마트그리드 실증단지사업을 완료한 이후, 현재 AMI 및 ESS 보급사업을 진행 중이고 더불어 주요 7~8개 도시에 대한 스마트그리드 시티 사업도 준비 중에 있다. 스마트그리드 인프라의 본격적인 확산과 더불어 가장 우려되는 사안 중의 하나가 사이버 보안 이슈이며, 이는 기존의 주요 전력망 보안정책이 폐쇄망 운영을 골자로 하고 있다는 점에서 볼 때 상충되는 측면이 있다. 스마트그리드의 중심이 기존의 대형 전력망 중심에서 스마트 홈 기반 중심으로 옮겨가면서, 전력망은 외부 네트워크와의 연결성이 강화되고 있으며 통신 분야에서 진행되어 오던 사물통신(Internet of Things: IoT) 개념과 결합하면서 그 개방성의 진행이 가속화되고 있다. 따라서 기존의 폐쇄망 정책만으로는 보안성을 확보하는데 명확한 한계가 존재하며 시대적 조류에도 부합하지 않기 때문에, 새로운 패러다임이 필요한 때라고 판단된다. 그 대안 중의 하나로 개방 네트워크로 인해 증가하는 연결성을 보안 위협의 루트가 아닌 보안성을 강화하기 위한 환경으로 활용하는 것이다. 촘촘히 연결된 네트워크를 통해 각 개체가 서로를 상호 모니터링 함으로써 전체 시스템이 오염되는 것을 막을 수 있다. IoT의 도입을 통해 기기 간에는 사회적 연결성이 강화될 것이며, 이러한 연결성과 그 안에 숨겨진 맥락을 통해 이상 여부를 사전에 감지해낼 수 있다. 본 논문에서는 그러한 사회적 관계성에 근거하여 AMI 네트워크에서의 이상 징후를 감지하기 위한 기본적 방법론을 제안하고자 한다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2010.06a
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• pp.158-158
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• 2010

최근 유리산업은 에너지 절감효과와 친환경 재료의 사용을 바탕으로 하여 기존 유리의 특성을 변화시켜 보다 양질의 재료를 생산해 내고자 한다. 또한 인위적으로 가시광선 전파장에 대한 투과율을 조절할 수 있는 유리 제작의 필요성이 대두되어 스마트 윈도우(smart window)라는 신소재유리가 주목받고 있다. 스마트 윈도우는 태양광의 투과율을 자유롭게 조절할 수 있는 물질을 윈도우에 삽입함으로써 필름을 장착하는 방식에 비하여 태양광의 투과율이 대폭 신장됨과 동시에 사용자에게 고도의 편의성을 제공하는 장점이 있다. 액정과 고분자 매트릭스를 혼합한 PDLC용액을 이용하여 $3{\times}4cm^2$ 크기의 스마트 윈도우를 제작하여 유리 두께, 광량, 스페이서 크기에 따른 투과율을 측정하였다.