• 센서학회지
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• 제23권4호
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• pp.238-244
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• 2014

In this paper, we introduce a new passive transponder that operates without external power in a visible light identification system. The transponder consists of a solar cell, a photodiode, a microprocessor, and a visible LED. When a reader sends light to the transponder, the solar cell generates current from the reader light and supplies power to the other elements in the transponder. At the same time, the photodiode detects the pulse in the reader light and initiates a microprocessor to generate and send a responding light to the reader. In experiments, we realized a passive transponder using a solar cell that operated at a distance of 1m without external power.

• 한국전자파학회논문지
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• 제21권5호
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• pp.494-500
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• 2010

본 논문에서는 무선광 인식 장치를 새로이 제안하고 실험하였다. 무선광 인식 장치는 리더와 트랜스폰더로 구성되며, 이들은 동일한 구조로서 조명용 LED의 빛을 전송 매체로 사용하고 솔라 셀로 수신하여 서로 정보를 교환한다. 솔라 셀은 수광 표면이 넓고 평면이어서 렌즈를 사용한 광학적 정렬이 필요하지 않기 때문에 구조가 간단하고 사용이 편리하며, 관리 대상 물체의 표면에 부착하기가 용이하다. 또한 무선광 인식 장치는 빛을 전송 매체로 사용하기 때문에 RF 주파수와의 간섭이 없어 안정하다. 실험에서는 솔라 셀을 사용하여 거리가 약 1 m에서 트랜스폰더의 정보를 자동으로 인식하는 무선광 인식 장치를 구현하였다.

• 동굴
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• 제95호
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• pp.15-21
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• 2009

온실가스와 지구촌 온난화, 그리고 이를 치유하기 위한 인간의 노력과 필요한 대안기술은 마치 성난 자연을 잠재우기 위한 노력과 그에 필요한 재원을 동원하기보다도 더 어려운 일인가보다. 한정된 화석연료는 수십 년 내에 고갈될 수밖에 없으며, 국제무대에서 나라마다 자원을 확보하려는 외교활동의 치열함은 마치 자원 확보를 위한 전쟁을 방불케 하는 모습이다. 화석연료의 고갈은 친환경 녹색성장이라는 새로운 대안정책을 불러왔고, 태양에너지 활용을 위한 태양전지기술은 날로 발전을 거듭하고 있으며, 이와 함께 세상을 밝혀주기 위한 조명광기술은 석유등, 백열등으로부터 발광다이오드에 이르러 첨단 광역시장을 이루었다. 따라서 이들을 탄생시킨 반도체기술로부터 태양전지와 발광다이오드를 접목시켜 일체화시킨 SOLAR-LED 시스템과 함께 저탄소녹색조명의 동굴응용 기술을 조명한다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2010년도 춘계학술대회
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• pp.581-582
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• 2010

광 의료 분야 중 저출력레이저 치료에 사용되는 레이저와 같은 특정 파장을 발생하고 레이저보다 안정적으로 사용이 가능한 고휘도 LED를 조사하여 광 의료 분야에 적용할 수 있는 시스템을 개발하였다. 광조사 시스템은 마이크로 컨트롤러, FPGA, TLC5941 및 고휘도 LED를 이용하여 설계 및 제작하였으며 광조사 시간, 강도, 주기 등 세포 증식에 영향을 칠 수 있는 다양한 변수들의 제어가 가능하도록 하였다. 또한 세포 배양에 사용되는 인큐베이터 내부의 조사가 용이하도록 탈부착이 가능한 모듈화 된 LED를 설계 제작하여 세포 증식에서 발생 가능한 생물학적 변수를 최소화하였다.

• 한국산업융합학회 논문집
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• 제23권4_2호
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• pp.701-708
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• 2020

In this paper, we analyzed the optical properties of the LED module for dental care, which has the effect of promoting cell regeneration and scar treatment. The LED module is a U-shaped module suitable for the shape of teeth. It is manufactured with an LED module (632 nm) and an LED module (632 nm + 870 nm), analyzes the results of optical properties, sets the irradiation distance, irradiation time, and is effective in healing skin wounds. Evaluation was conducted. It was tested in 6 test groups according to the light irradiation conditions, and light was irradiated to the scar site every other day for 7 days, 1 day and 3 days. As a result, it was confirmed that the effect of scar treatment was the highest when the combined wavelength of 632 nm + 870 nm was irradiated in pulse mode than when the single wavelength was irradiated and the composite wavelength was continuously irradiated. In group C group irradiated with PW Mode: pulse mode (period 36 ms, pulse width 35 ms) using a composite wavelength with LED module (632 nm + 870 nm) than group A without light irradiation, the length of scar reduction was 19 %, the area of the scar was further reduced by 10%, and it was confirmed that it is effective in treating scars in the wound area.

• 융복합기술연구소 논문집
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• 제3권1호
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• pp.37-40
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• 2013

Plant factory industry as a new agriculture is in the spotlight. In this paper, we experimented plant factory applied photovoltaic system and LED lighting. For growing the plant, red, blue and white LED were placed into 1:4:3. Electric power generated by the photovoltaic system was supplied on DC power supply instead of AC. The designed and experimented power generation amount per day of photovoltaic system were 2,860 Wh and 2,272 Wh respectively. Plant has not been grown at the dead space of LED lighting so it is required to array LED lighting.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2014년도 제49차 동계학술대회논문집 22권1호
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• pp.417-419
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• 2014

본 논문에서는 태양광 전지판을 장착한 LED 가로등을 설계 제작하였다. 제작비용을 고려하여 간단한 구조에서 태양광 전지판에 많은 양의 태양광을 받도록 하고, 태양이 없어 발전을 하지 않을 때는 태양광 전지판에 오염 물질이 적게 부착되게 하며 또 태양광 전지판에 붙은 이물질, 오염 물질을 쉽게 제거 작업을 하게 하기 위하여 태양광 전지판을 접을 수 있도록 구성하였다. 또한 LED 인버터를 사용하지 아니하고 직류를 그대로 사용하게 하므로 전기 변환에 따른 에너지 손실을 방지할 수 있고, 이에따라 시스템의 효율을 기할 수 있었다. 본 연구를 통해 LED 등 설계 및 제작 기술, 인버터 변환 없는 직류 사용 효율 증대 기술, 원격 및 수동 조작 Controller 설계 및 제작 기술, 접이식 Sollar Cell 기구물 개발 기술을 확보하고 향후 태양광 전지판 가로등과 관련된 다양한 연구를 할 수 있는 기반을 마련하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2009년도 하계학술대회 논문집
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• pp.423-423
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• 2009

Currently, lasers are one of the most popular light sources in use for medical treatment. Many studies on low power lasers are being done in cell culture or through animal tests and most report different findings, making it difficult to verify their true effects. There are shifts in trends of studies from laser and LED that are expensive and generate heat problem to LED that are economically effective and safe. Its near infrared rays can penetrate deep into skin or muscle, up to 23 cm, without causing thermal damage or impairing neighboring tissues. This study verified the performance and effectiveness of an LED irradiator that was designed to emit similar wavelengths to that of a laser and thus could be used instead of a low level laser therapy in experiments on animals. And then, each experiment was performed to irradiation group and non-irradiation group for NTacSam:SD tissue cells. MIT assay method was chosen to verify the cell increase of two groups and the effect of irradiation on cell proliferation was examined by measuring 590nm transmittance of ELISA reader. As a result, the cell increase of NTacSam:SD tissue cells was verified in irradiation group as compared to non-irradiation group. The fact that specific wavelength irradiation has an effect on cell vitality and proliferation is known through this study.

• 한국전기전자재료학회논문지
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• 제20권1호
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• pp.92-97
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• 2007

This paper performed the basic study for developing the Photodynamic Therapy Equipment for medical treatment. We developed the equipment palpating cell proliferation using a high brightness LED. This equipment was fabricated using a micro-controller and a high brightness LED, and designed to enable us to control light irradiation time, intensity, frequency and so on. Especially, to control the light irradiation frequency, FPGA was used, and to control the change of output value, TLC5941 was used. Control stage is divided into 30 levels by program. Consequently, the current value could be controlled by the change of level in Continue Wave(CW) and Pulse Width Modulation(PWM), and the output of a high brightness LED could be controlled stage by stage. And then, each experiment was performed to irradiation group and non-irradiation group for both Rat bone marrow and Rat tissue cells. MTT assay method was chosen to verify the cell increase of two groups and the effect of irradiation on cell proliferation was examined by measuring 590 nm transmittance of ELISA reader. As a result, the cell increase of Rat bone marrow and tissue cells was verified in irradiation group as compared to non-irradiation group. The fact that specific wavelength irradiation has an effect on cell vitality and proliferation is known through this study.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제43회 하계 정기 학술대회 초록집
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• pp.115-116
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• 2012

The demand for flexible electronic systems such as wearable computers, E-paper, and flexible displays has increased due to their advantages of excellent portability, conformal contact with curved surfaces, light weight, and human friendly interfaces over present rigid electronic systems. This seminar introduces three recent progresses that can extend the application of high performance flexible inorganic electronics. The first part of this seminar will introduce a RRAM with a one transistor-one memristor (1T-1M) arrays on flexible substrates. Flexible memory is an essential part of electronics for data processing, storage, and radio frequency (RF) communication and thus a key element to realize such flexible electronic systems. Although several emerging memory technologies, including resistive switching memory, have been proposed, the cell-to-cell interference issue has to be overcome for flexible and high performance nonvolatile memory applications. The cell-to-cell interference between neighbouring memory cells occurs due to leakage current paths through adjacent low resistance state cells and induces not only unnecessary power consumption but also a misreading problem, a fatal obstacle in memory operation. To fabricate a fully functional flexible memory and prevent these unwanted effects, we integrated high performance flexible single crystal silicon transistors with an amorphous titanium oxide (a-TiO2) based memristor to control the logic state of memory. The $8{\times}8$ NOR type 1T-1M RRAM demonstrated the first random access memory operation on flexible substrates by controlling each memory unit cell independently. The second part of the seminar will discuss the flexible GaN LED on LCP substrates for implantable biosensor. Inorganic III-V light emitting diodes (LEDs) have superior characteristics, such as long-term stability, high efficiency, and strong brightness compared to conventional incandescent lamps and OLED. However, due to the brittle property of bulk inorganic semiconductor materials, III-V LED limits its applications in the field of high performance flexible electronics. This seminar introduces the first flexible and implantable GaN LED on plastic substrates that is transferred from bulk GaN on Si substrates. The superb properties of the flexible GaN thin film in terms of its wide band gap and high efficiency enable the dramatic extension of not only consumer electronic applications but also the biosensing scale. The flexible white LEDs are demonstrated for the feasibility of using a white light source for future flexible BLU devices. Finally a water-resist and a biocompatible PTFE-coated flexible LED biosensor can detect PSA at a detection limit of 1 ng/mL. These results show that the nitride-based flexible LED can be used as the future flexible display technology and a type of implantable LED biosensor for a therapy tool. The final part of this seminar will introduce a highly efficient and printable BaTiO3 thin film nanogenerator on plastic substrates. Energy harvesting technologies converting external biomechanical energy sources (such as heart beat, blood flow, muscle stretching and animal movements) into electrical energy is recently a highly demanding issue in the materials science community. Herein, we describe procedure suitable for generating and printing a lead-free microstructured BaTiO3 thin film nanogenerator on plastic substrates to overcome limitations appeared in conventional flexible ferroelectric devices. Flexible BaTiO3 thin film nanogenerator was fabricated and the piezoelectric properties and mechanically stability of ferroelectric devices were characterized. From the results, we demonstrate the highly efficient and stable performance of BaTiO3 thin film nanogenerator.