• Electrical & Electronic Materials
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• v.25 no.2
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• pp.29-37
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• 2012

• Electrical & Electronic Materials
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• v.28 no.6
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• pp.20-25
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• 2015

• Journal of the Korean Society for Nondestructive Testing
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• v.32 no.5
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• pp.603-610
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• 2012

• KIPE Magazine
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• v.25 no.4
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• pp.62-67
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• 2020

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.111-112
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• 2015

우리는 이 논문에서, 압전소자, 태양열판, 풍력, 전자기 유도 현상 등을 사용하여 버려지는 폐에너지를 수확하는 에너지 하베스팅의 방법에 대해 서술하고, 그것을 적용하는 아이디어 등을 설명할 것이다. 압전소자의 효율을 측정한 방법과 결과 및 그 효율을 높일 수 있는 모형에 대해 서술할 것이다. 또한, 나머지 방법들의 분석과 에측 내용을 서술할 것이다.

• Science of Emotion and Sensibility
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• v.24 no.2
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• pp.25-38
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• 2021

The aim of this study is to protect workers and pedestrians from accidents at night or bad weather by attaching optical fiber to existing safety clothing that is made only with fluorescent fabrics and retroreflective materials. A safety vest was designed and manufactured by applying optical fiber, and energy-harvesting technology was developed. The safety vest was designed to emit light using the automatic flashing of optical fibers attached to the film, and an energy harvester was manufactured and attached to drive the light emission of the optical fiber more continuously. As a result, first, the vest wearer' body was recognized from a distance through the optical fiber and retroreflection, which helped prevent accidents. Thus, this concept helps in saving lives by preventing accidents during night-time work on the roadside or activities of rescue crew and sports activities, or by quickly finding the point of an accident with a signal that changes the optical fiber light emission. Second, to use the wasted energy, a piezoelectric-element power generation system was developed and the piezoelectric-harvesting device was mounted. Potentially, energy was efficiently produced by activating the effective charging amount of the battery part and charging it auxiliary. In the existing safety vest, detecting the person wearing the vest is almost impossible in the absence of ambient light. However, in this study, the wearer could be found within 100 m by the light emission from the safety vest even with no ambient light. Therefore, in this study, we will help in preventing and reducing accidents by developing smart safety clothing using optical fiber and energy harvester attached to save lives.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.10a
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• pp.392-395
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• 2011

In this paper, a vibration energy harvesting circuit using the piezoelectric element has been designed. MPPT (maximum power point tracking control) control function has been implemented to deliver the maximum power to the load by using the electric power-voltage characteristic of the piezoelectric element. The designed MPPT circuit traces the maximum power point by sampling periodically the open circuit voltage of the full wave rectifier circuit and delivers the maximum available power to the load. The vibration energy harvesting circuit is designed with $0.18{\mu}m$ CMOS process. The maximum power efficiency is 91%, and the chip area except pads is $1,100{\mu}m{\times}730{\mu}m$.

• Land and Housing Review
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• v.5 no.2
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• pp.99-106
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• 2014

The purpose of this study is to develop hybrid energy blocks with piezoelectric and electromagnetic induction method. The developed energy block is able to be applied to the housing and facilities in the city and is suitable to adjust the characteristics of facilities. To develop the hybrid energy block, we analyzed the characteristics and requirements of various energy block types and drew improvement and application method to develop energy blocks. We compared and analyzed the characteristics and performance of the prototype energy blocks and the developed hybrid energy blocks. According to result of the comparison and analysis, the developed energy block shows higher performance of 12.7 times for adding one vibration and 28.9 times for five consecutive vibrations than that of a existing prototype energy block. This is consistent with research purposes for W-level electrical energy production. Thus, the new energy block will likely be possible to apply to the housing and urban facility.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.16 no.1
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• pp.18-23
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• 2023

A smart sensor is the key element to implement IoT (Internet of Things) service, as a terminal equipment. This paper investigated the design method of a power supply using energy harvesting technique for a smart sensor. the performance of a power supply using a solar cell and a piezoelectric transducer as a energy harvesting device was verified and the method to optimize a power supply was analyzed depending on the operating condition of a smart sensor. Also the method to increase a battery life cycle as a auxiliary power supply was proposed.

• Journal of the Institute of Convergence Signal Processing
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• v.22 no.3
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• pp.134-140
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• 2021

This study relates to the development of a wearable device that can identify a personal location using low-power GPS and IMU based on energy harvesting. The energy harvesting technology using a piezoelectric device was applied for the development of personal location identification, and made it possible to acquire precise personal location data using GPS and IMU. As a result of the experiment, it was confirmed that GPS and IMU data were normally received. The personal location identification device can be prepared for an accident by identifying a personal location in a disaster area, etc., and the user will be able to use it easily regardless of time, place, and environment. It is expected that it can be used in various fields such as leisure and health care.