• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.07a
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• pp.577-580
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• 2000

We measured 3-dimensional images of the light emitted from plasma display panel(PDP) by using newly proposed scanned point detecting method(SPDM). The SPDM has the point detector with pinhole. The light emitted from PDP cell at the in-focus position can pass through the pinhole and be collected by detector. On the contrary, the light emitted from PDP cell at the out-of-focus positions is focused on the front of or the behind of the pinhole. We could analyze the characteristic of 3-dimensional light emission distribution by SPDM. From 3-dimensional measurement of 828nm, we found that the efficient design of PDP cell, the importance of opening ratio, and the relations between BUS electrode position and discharge intensity are obtained.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2004.11a
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• pp.457-460
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• 2004

This study examines the sound insulation of the light-weight wall using light-weight concrete and offers the basic datum for enhancing it. The sound insulation of the light-weight wall is determinated by the density, installation method, absorption materials, air layers etc. Among the factors, the solution of outlet that is the major cause of reducing sound insulation should be made. If absorption materials are installed in the cavity walls, it enhances to 15dB in 500Hz.

• Journal of Acupuncture Research
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• v.32 no.3
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• pp.211-220
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• 2015

Objectives : We report two cases of pressure ulcer patients to show the efficacy of treatment with acupuncture and Light Enitting Diode(LED) light therapy. Methods : We treated two pressure ulcer patients with acupuncture, LED light therapy, herbal medication and with a simple dressing. LED light with up to $4J/cm^2$ of energy irradiated the pressure ulcer site once a day for fifteen minutes. All patients received acupuncture treatment and simple dressing for wound care. We measured phase change of the pressure ulcer in terms of ulcer size, The National Pressure Ulcer Advisory Panel(NPUAP) stage and with the The Pressure Ulcer Scale for Healing(PUSH) tool(3.0). Results & Conclusions : In each of the two cases, pressure ulcer size and total score of the PUSH tool decreased and NPUAP stage was improved from II to I. This shows that acupuncture treatment and LED light therapy may have a considerable effect in healing on the pressure ulcer.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2008.11a
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• pp.617-618
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• 2008

• 한국정보디스플레이학회:학술대회논문집
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• 2004.08a
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• pp.277-280
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• 2004

Thin-film photosensors on organic light emitting diode (OLED) glass substrates using active-matrix OLED TFT manufacturing processes have been constructed and optimized, and their performance has been characterized. Suitable control circuitry and applications are proposed. The photosensors may be integrated into OLED displays for detection of ambient illumination and for detection of OLED light emission, thereby enabling output, uniformity, and aging compensation.

• Proceedings of the Korean Fiber Society Conference
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• 2007.11a
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• pp.469-470
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• 2007

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• Polymer(Korea)
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• v.36 no.5
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• pp.662-667
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• 2012

Poly(ethylene terephthalate) (PET) base films with high light transmittance have been used for the substrate of various functional films in the flat panel display. The effects of the reflective index of coated films, the roughness of the film surface and the content of inorganic silica particles on the light transmittance were studied in this article. Light transmittance was increased by coating a water soluble resin with a low reflective index at an optimum thickness. The roughness of the film did not affect light transmittance when the Ra of the film surface was less than a quarter of the wavelength of incident light. Inorganic silica particles decreased light transmittance due to their absorbance and scattering of the incident light.

• Journal of Science Education
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• v.35 no.2
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• pp.173-192
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• 2011

The purpose of this study was to develop inquiry modules for learning straight propagation of light, to verify their efficiency, and to acquire implications. this study proposes teaching modules for improvements of light experiments, which were developed in this work. Inquiry modules were applied to 75 school teachers(8 elementary school teachers, 67 middle school and high school teachers) for examining that the modules make teachers have the scientific concepts. Then, conception changes were analyzed except 5 teachers who responded poorly. The pre-test result shows that most teachers have alternative conceptions, which is that they thought the bright shape on apparatus's bottom panel itself shown in the textbook as evidence for the path of light's straight propagation. The post-test result shows this alternative conception was changed into scientific conception. Unlikely pretest, most teachers' conception was changed into the scientific conception that the light come from a light source. Teachers are able to express that the light beam comes from a miniature electric bulb. Further more, most teachers can draw light's path correctly; from the miniature electric bulb, through vertical panel having a hole, to the apparatus bottom.

• 한국정보디스플레이학회:학술대회논문집
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• 2004.08a
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• pp.787-790
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• 2004

The large size and high brightness backlight system for LCD panel inspection equipment was designed, fabricated, and evaluated. The cold cathode fluorescent lamp (CCFL) instead of the hot cathode fluorescent lamp (HCFL) were used as the light source. The inverters for driving multi-lamp CCFL backlight systems were also designed and fabricated. The measured luminance of the fabricated CCFL backlight system was 20,000 cd/$m^2$ and the uniformity of the backlight was 85%. The fabricated backlight system was successfully applied to the LCD panel inspection equipment.

• 한국정보디스플레이학회:학술대회논문집
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• 2004.08a
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• pp.356-358
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• 2004

In this paper we fabricated and succeeded to demonstrate a test panel for AMOLED on 2" glass and PET substrate. The test panel consisted of an array of 64 x 64 pixels in which OLEDs was driven by pentacene TFT. OTFTs were made of the inverted staggered structure and employed polyvinylphenol as the gate insulator and pentacene thin film as the active layer, producing the filed effect mobility of 0.3$cm^2$/V.sec and on/off current ratio of $10^5$. OLEDs were composed of TPD for HTL and Alq3 for EML with 35nm thick each, generating green monochrome light.