• Journal of Power Electronics
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• 제12권6호
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• pp.869-877
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• 2012

This paper presents a current-balancing circuit for security lights that uses parallel-connected LEDs. The parallel connection of LEDs causes current differences between the LED strings because of characteristic deviations. These differences can reduce the lifespan of a particular point of LEDs by thermal spotting. They can also cause non-uniform luminance of the lighting device. Among the different methods for solving these problems, the method using current-balancing transformers makes it easy to compensate for current differences and it has a simple circuitry. However, while the balancing transformer has been applied to AC light sources, LEDs operate on a DC source, so the driving circuitry and the design method have to be changed and their performances must be verified. Thus in this paper, a design method of the balancing transformer network and the driving circuitry for LEDs is proposed. The proposed design method could have a smaller size than the conventional design method. The proposed circuitry is applied to three types of 100-watt LED security lights, which use different LEDs. Experimental results are presented to verify the performance of the designed driving circuits.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2016년도 전력전자학술대회 논문집
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• pp.79-80
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• 2016

A discrete time domain analysis for the duty-cycle-controlled buck LED driver is performed in this paper. Based on the analysis, the design guidelines are derived. Experimental results are presented to confirm the design.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2017년도 전력전자학술대회
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• pp.321-322
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• 2017

A discrete time domain analysis for the slope-compensated buck LED driver is performed in this paper. Based on the analysis, the design guidelines are derived. Experimental results are presented to confirm the design.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.855-856
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• 2011

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2008년도 춘계학술발표논문집
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• pp.170-172
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• 2008

본 논문은 LED조명기구의 상용화에 문제가 되고 있는 방열설계에 관한 논문으로서, CF-design을 이용한 방열해석을 통하여 문제해결의 방법을 제시한다. 해석 결과 시뮬레이션 값과 시작품 제작 후 측정 온도와의 차이가 6[$^{\circ}C$]이하로 도출되었으며 주어진 제 요소들을 잘 활용하면 실제작품의 목표치에 근접하는 결과를 얻을 수 있다.

• 한국의상디자인학회지
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• 제21권1호
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• pp.103-113
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• 2019

The purpose of this study was to develop an e-textile using LEDs that can enhance visual and functional effects, and to identify their applicability to sportswear. By applying the design elements of fashion design concretely with LEDs, an e-textile design module is developed and that module is applied to the product, so LED application design can be proposed for use in a practical product. E-textiles have been divided into five categories, and their usefulness were verified by applying e-textiles to men's and women's sportswear. The product beign considered has a built-in tilt sensor, which illuminates the LEDs according to the user's movements, and allows the LEDs to be turned on or off in accordance to the user's preference. E-tatoo is a type of LED application that enhances the appearance by placing LEDs on a small area, emphasizing origin points, just like an actual tattoo. Designed with LEDs arranged in a straight line and various curved forms, e-strips can provide a function that matches the characteristics of each section of clothing or fashion item. E-wappen uses about 7-10 LEDs to give motifs a strong sense of visibility, thus adding to their vibrancy. E-panels and e-clothes were able to produce creative and high-value textures. It is also expected to be used for special purposes or bags as it is possible to produce high value-added textures that are creative and aesthetically beautiful. For instance, a progressive LED string on the straight line of female leggings can further emphasize rhythmic movements during exercise, and e-wappen also serves the purpose of nighttime protection. It is also believed that the application of dance or dance-related sportswear will make the movement of the performance more intense and lively.

• 한국정보통신학회논문지
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• 제19권3호
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• pp.558-566
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• 2015

차세대 조명광원인 LED가 급격하게 발전하고 저 전력, 고효율, 장수명의 장점을 가지고 있어 LED를 이용한 조명에 관심이 높아지고 있다. LED를 이용하여 감성조명을 구현하게 되면 기존의 단색의 조명과는 다르게 빛의 3원색을 이용한 모든 색상을 구현할 수 있다. 이러한 장점으로 인간의 감정까지 다스릴 수 있는 LED 감성조명이 지속적으로 개발되고 있다. 본 논문에서는 실내 환경에서의 집중 및 휴식상황에 맞는 색상을 추출하고 사용자가 느끼는 온도의 색상과 배합하여 상황과 온도에 대한 LED 감성조명을 표현하기 위해 알고리즘을 설계한다. 그리하여 뉴로-퍼지시스템을 이용하여 설계된 LED 감성조명은 사용자에게 집중 및 휴식에 대한 감성에 효과적인 영향을 나타낼 수 있을 것이다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2017년도 추계학술대회
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• pp.220-221
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• 2017

초기의 LED(light emitting diode)는 광 출력이 낮아 각종 기계장치의 Table 시용 소자로 많이 사용되었으나, LED 기술의 발달로 고출력 고휘도로 색 Table 현이 가능하게 되었다. 따라서 교통 신호등, 대형 전광판, 자동차Table 시과 같은 디스플레이로 사용하고 있으며, 높은 광량을 요구하는 백열등, 형광등과 같은 실내외 조명에서도 LED가 사용되고 있다. 항로Table 지에 사용되는 등명기 또한 전구에서 LED로 교체되었으며, 초기의 해상용 LED 등명기는 다수의 LED를 사용하여 제작되었다. 하지만 고출력 LED의 개발로 광학 설계만 새롭게 한다면 소수의 LED만을 사용하더라도 해상용 LED 등명기에서 요구하는 광도 및 배광을 만족시킬 수 있다.

• 한국가구학회지
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• 제24권2호
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• pp.113-120
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• 2013

The purpose of this research is to provide new direction on the field of the furniture design and to establish the identity of Korean furniture design as the flow of craft's juxtapose mixture era where it mix and match Korean traditional craft style materials with the modern furniture design. In other words, it is intended to create new furniture design and propose beautiful Korean luxury furniture design based on the precious unique culture with the traditional craft style, juxtaposition of modern furniture, and reinterpretation. It should grant artistic values that can satisfy consumers having various tastes and scarcity values, plus it should put out aesthetic and creative expressions in furniture design putting into the beautiful traditional craft form values. Furthermore, it is required to create new design through values and spirit, materials, techniques, forms, pattern, and usages by interacting, coordinating, and combining tradition and modern East and West, plus craft and design.

• 패션비즈니스
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• 제25권1호
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• pp.51-64
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• 2021

The purpose of this study was to develop smart bags that combining fashion-specific trends and smart information technologies such as light-emitting diodes(LED) and optic fibers by grafting marquage techniques that have recently become popular as part of eco-fashion. We applied e-textiles by designing leather tote bags that could show off LED luminescence. A total of two tote bags, a white-colored peacock design and a black-colored paisley design, divided the LED's light-emitting method into two types, incremental lighting and random light-emission to suit each design, and the locations of the optical fibers were also reversed depending upon the design. The production of circuits for the LEDs and optical fibers was based on the design, and a flexible conductive fabric was laser-cut instead of wire line and attached to the circuit-line location. A separate connector was underwent three-dimensional(3D)-modeling and was connected to high-luminosity LEDs and optic fiber bundles. The optical fiber logo part expressed a subtle image using a white-colored LED, which did not offset the LED's sharp luminous effects, suggesting that using LEDs with fiber optics allowed for the expression of each in harmony without being heterogeneous. Overall, the LEDs and fiber optic fabric were well-harmonized in the fashion bag using marquage techniques, and there was no sense of it being a mechanical device. Also, the circuit part was made of conductive fabric, which is an e-textile product that feels the same as a thin, flexible fabric. The study confirmed that the bag was developed as a smart wearable product that could be used in everyday life.