• 한국전기전자재료학회논문지
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• 제29권2호
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• pp.79-83
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• 2016

This research was analyzed thermal characteristics that was appointed disadvantage when smart LED driver ICs was packaged and we applied extracted thermal characteristics for optimal layout design. We confirmed reliability of smart LED driver ICs package without additional heat sink. If the package is not heat sink, we are possible to minimize package. For extracting thermal loss due to overshoot current, we increased driver current by two and three times. As a result of experiment, we obtained 22 mW and 49.5 mW thermal loss. And we obtained optimal data of 350 mA driver current. It is important to distance between power MOSFET and driver ICs. If thhe distance was increased, the temperature of package was decreased. And so we obtained optimal data of 3.7 mm distance between power MOSFET and driver ICs. Finally, we fabricated real package and we analyzed the electrical characteristics. We obtained constant 35 V output voltage and 80% efficiency.

• 복식문화연구
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• 제30권2호
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• pp.319-329
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• 2022

This study started from the practical need for a career experience program in the fashion major that is creative and responds to current methodologies. The purpose of this study is to propose a fashion work experience program that combines digital technology and practical experience. The research methods and procedures were as follows: fashion items and wearable devices were selected, the LED smart bag program was developed, and it was executed. A total of 123 students participated in the program, and a satisfaction survey was conducted after observation and oral evaluation. All of the participants completed the LED smart bag processes of design ideation, material selection, production, and styling using an eco-bag (one of the fashion items and as an LED wearable device). As a result of the participants' satisfaction (on a 5-point scale), most items showed a high level of satisfaction of 4.39 points or more. The smart bag program was evaluated to increase interest based on the time allotted and the students' level and to bolster their understanding of, and interest in, the fashion major. Therefore, this study is expected to be baseline to explore diversification of the fashion major work experience program, in order to create interest in the fashion major based on creative convergence competency.

• 한국컴퓨터정보학회논문지
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• 제21권5호
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• pp.127-133
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• 2016

In this paper, an intelligent dimming control system is designed and implemented with the human visual response function using CDS sensor, PIR sensor and temperature sensor, etc. The proposed system is designed to detect a moving object by PIR sensor and to control the LED dimming considering the human visual response. Also, the dimming of LED light can modulate on the app, and simultaneously control dimming in real-world environments with smart phone app. A high-temperature warning or a fire hazard information is transmitted to user's smart phone according to sensor values and Data graph are provided as part of data visualization. Connecting the hardware controller, the proposed intelligent smart dimming control system is expected to contribute to the power reduction interior LED, smart grid building and saving home combining with internet of things.

• 한국전자통신학회논문지
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• 제16권6호
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• pp.1349-1354
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• 2021

일체형 등명기는 운항 중인 선박의 항로 선위를 결정하기 위한 등화장치이다. 현재 태양광을 기반으로 하는 일체형 등명기는 태양광의 일조시간에 따른 제약에 따라 전력 공급의 부족으로 항로 표시 가능한 능력이 제한적이다. 본 논문에서는 해상의 풍부한 전력원인 태양광과 풍력을 동시에 사용하는 신재생에너지 일체형 9해리 LED 등명기를 구축하고 원격 스마트 모니터링 시스템을 구현하였다. 또한 LED 등명기 장치와 모니터링 시스템을 IoT화 함으로서 등명기의 원격제어 가능한 스마트 제어시스템을 마련하였다. 본 원격 스마트 모니터링 시스템을 적용하여 실시간 상태 모니터링 및 원격제어가 가능하게 하여 선박이 안전한 항해를 할 수 있고 등명기 기능의 정확성 및 영속성을 유지하여 해양사고 예방과 사회적 비용을 절감할 수 있다.

• 대한임베디드공학회논문지
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• 제7권2호
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• pp.103-111
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• 2012

This paper introduces a novel concept of 'A Green LED Sensitivity Lighting System' which can automatically estimate QoS(quality of service) and emotional requirements of user using smart phone. And it can intelligently control ambient illumination lamp to conserve electric energy and to satisfy human sensitivity. The proposed system has 4 control modes; emotional lighting, smart lighting, green lighting and realistic lighting modes in order to comfort man's emotion, to maximize work efficiency, to save energy consumption and to make the entertainment more fun, respectively. When we choose green lighting mode for indoor office situations, an elaborate simulation shows that the proposed system with home network can reduce the energy by 50% compared to conventional light control system with a fixed time-based switching.

• 정보와 통신
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• 제34권2호
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• pp.12-19
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• 2017

The LED technology advancement introduce cuttingedge technology on Internet of Things (IoT) to connect the physical world to the digital realm, using digital smart lighting infrastructure called Internet of light (IoL). This paper proposes an Integrated IoT agent on networked smart LED lighting controller called IoL Filed Gateway using lighting infrastructure in which a lighting system that can connect to a network and can be monitored and controlled from a centralized system or via the cloud. The IoL Field Gateway defines new world of smart connected intelligence, lighting can become an integral and responsive part of everyday human life environments. The proposed connected lighting gateway uses the concept of multi-hop ad hoc network using visible light communication (VLC) with RF wireless technologies and Wired PLC (Power Line Communication). This connectivity and intelligence integrated into LED-based luminaires form the backbone of smart buildings and cities and make the Internet of Things (IoT) vision feasible and enables the lighting administrator can control numerous lightings easily and visitors can get visual information from the lightings with their smart devices. The proposed IoL gateway design is emulated on Arduino based HW platform with VLC, RF, and PLC connectivity and evaluated with four sensor interface.

• 전력전자학회논문지
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• 제19권4호
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• pp.320-326
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• 2014

In this paper, the new smart dimming algorithm which is mixed with PWM and PAM control method is proposed for reducing the power consumption of LED TV Backlight. The proposed technique is using the curve characteristics of LED forward voltage and current which is proportionally changing LED forward voltage as changing LED forward current. Therefore, each PWM and PAM control method has different LED forward voltage and current in the same brightness condition. The PWM control method adjusts the brightness of LED TV Backlight by only varying the duty ratio of PWM and constantly sustaining the amplitude of LED forward current and voltage. So, the level of LED forward current and voltage in the PWM control method is relatively high and constant regardless of duty ratio of PWM. On the other hand, the PAM control method adjusts the brightness of LED TV Backlight by directly varying the level of LED forward current. So, the level of LED forward current and voltage in the PAM control method is lowered according to the brightness level. For the above-mentioned reason, the PAM control method has the advantage of reducing the total power consumption of LED TV Backlight at the brightness condition of below 100%, compared with PWM control method. By implementing this characteristic to LED driver circuit with control algorithm in MCU, the power consumption of LED TV Backlight can expect to be reduced. The effectiveness of the proposed method, new smart dimming algorithm, CPWAM(=Conditional Pulse Width Amplitude Modulation), has been verified by experimental results.

• 한국정보통신학회논문지
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• 제20권7호
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• pp.1317-1324
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• 2016

아두이노 플렛폼을 활용하여 스마트 주얼리에 보석처럼 빛나는 효과를 나타내기 위해 감성적인 주얼리로 색을 표현하였다. 감성적인 색 표현을 위해 플러칙의 감정 팽이 모형을 활용하여 감정과 색의 유사성을 적용하였다. 스마트폰에서 쉽게 접할 수 있는 온도, 조도, 소리, 자이로 센서와 스마트 주얼리의 맥박센서로부터 인식된 값을 입력받아 감성을 인식하고 처리하는 과정은 온톨로지 기반의 추론규칙을 적용하고, 상황정보에서 나타난 감성에 따라 감성 색을 찾고 그 감성 색을 스마트 주얼리의 LED에 적용하였다. 주얼리 착용자의 감정에 따라 스마트 주얼리에 내장된 LED에 결정된 감성 색으로 빛을 냈다.

• 한국통신학회논문지
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• 제40권1호
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• pp.226-232
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• 2015

스마트기기 시대가 도래함에 따라, 최근 스마폰과 관련한 많은 응용 서비스들이 개발되고 있으며, LBS(Location Based Service) 기술은 위치 기반 서비스를 제공하기 위해 가장 중요한 기술 중의 하나로 인식되고 있다. 일반적으로 스마트폰의 위치인식은 GPS(Global Positioning System), G-Sensor와 같은 위치 인식 시스템 및 센서를 이용하여 위치 정보를 획득하게 된다. 그러나 실내에서는 위성으로부터의 GPS 신호를 수신하기가 거의 불가능하므로 실내 환경을 위한 새로운 LBS 기술이 필요하다. 본 논문에서는 이러한 문제를 해결하기 위해 LED 조명과 스마트폰의 카메라 센서를 이용한 위치정보 송수신기를 제안한다. 제안 위치 인식 시스템의 실용성 검증을 위해 실험실 환경에서의 실험을 통해 그 가능성을 입증하였다.

• 한국인터넷방송통신학회논문지
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• 제20권4호
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• pp.149-154
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• 2020

본 연구에서는 블루투스를 이용하여 스마트폰 으로 제어되는 Smart Diffuser 디바이스의 초기모델을 개발하였다. Smart Diffuser는 디바이스에 주입하는 오일을 분사시키기 위해 초음파 진동자를 이용하였다. 고휘도 LED를 사용하여 오일이 분사되는 동안에 색상 변화가 보여 지도록 디바이스를 개발하였다. 휴대용 디바이스인 점을 감안하여 충전 시간 문제를 해결하기 위해 40mAh의 Li-Po 배터리를 사용하여 장시간 사용할 수 있도록 설계를 하였다. Bluetooth Low Energy를 이용하여 저전력 구동을 구현을 함으로서 초기 설계모델의 유용성에 대해 확인 하였다.