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Eo, Yun Jae,Yoo, Gang Yeol,Kang, Hyelim,Lee, Young Ki,Kim, Chan Sik,Oh, Ji Hye,Lee, Keyong Nam,Kim, Woong,Do, Young Rag American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.43
<P>We introduce an orientation-controlled alignment process of p-GaN/InGaN multiquantum-well/n-GaN (p/MQW/n InGaN) nanorod light-emitting diodes (LEDs) by applying the direct current (DC) offset-alternating current (AC) or pulsed DC electric fields across interdigitated metal electrodes. The as-forwardly aligned p/MQW/n InGaN nanorod LEDs by a pulsed DC dielectrophoresis (DEP) assembly process improve the electroluminescence (EL) intensities by 1.8 times compared to the conventional AC DEP assembly process under DC electric field operation and exhibit an enhanced applied current and EL brightness in the current-voltage and EL intensity-voltage curves, which can be directly used as the fundamental data to construct DC-operated nanorod LED devices, such as LED areal surface lightings, scalable lightings (micrometers to inches) and formable surface lightings. The enhancement in the applied current, the improved EL intensity, and the increased number of forwardly aligned p/MQW/n InGaN nanorods in panchromatic cathodoluminescence images confirm the considerable enhancement of forwardly aligned one-dimensional nanorod LEDs between two opposite electrodes using DC offset-AC or a pulsed DC electric field DEP assembly process. These DC offset-AC or pulsed DC electric field DEP assembly processes suggest that designing for these types of interactions could yield new ways to control the orientation of asymmetric p/MQW/n InGaN diode-type LED nanorods with a relatively low aspect ratio.</P>
3차 의료기관 응급의료센터에서 시행된 병원내 심정지 환자의 심폐소생술 결과 분석
어은경,장혜영,전영진,정구영,손동섭,조대윤,양기민 대한응급의학회 2002 대한응급의학회지 Vol.13 No.3
Purpose: The "In-hospital Utstein Style" is an internationally recommended grideline for reporting outcome data from in hospital resuscitation events. This study was designed to evaluate the current status of in-hospital cardiopulmonary resuscitation(CPR) in a tertiary emergency department and to provide basic data for a unified report guidelines for resuscitation in Korea. Methods: A clinical analysis of 249 cases of in-hospital CPR performed in a tertiary emergency department from August 1995 to December 2001 was conducted. The evaluation was made using Utstein reporting guidelines. Results: During the period, 232 patients received 249 resuscitations. The immediate precipitating causes of cardiac arrest were cardiogenic in 61 cases (24.5%), traumatic in 58 cases (23.3%), respiratory in 41 cases (16.5%), and metabolic in 28 cases (11.3%), Initial EKG rhythms were bradyarrhythmia in 115 cases (46.2%), pulseless electrical activity in 69 cases (27.7%), ventricular fibrillation/tachycardia (VF/VT) in 36 cases (14.5%), and asystole in 26 cases (10.4%). The spontaneous circulation was returned in 153 of the 249 resuscitations (61.5%). In 59 of the 249 resuscitations(23.7%), spontaneous circulation was maintained for more than 24 hours. Sixteen of the 232 patients (6.9%), were discharged alive. The VF/VT group of initial EKG rhythm had a better outcome in comparison with non VF/VT group. The prognosis for respiratory arrest was better(78% probability of survival) than it was for other causes of arrest. Patients suffering from traumatic arrest showed the worst outcomes (9% probability of survival). Conclusion: Although the "In-hospital Utstein Style" is very subjective as a report determining the outcome of resuscitation, it has many complementary factors. However, even with the "Utstein Style", new guidelines compatible with the actual circumstances of our emergency department must be developed.
High-Color-Quality Multipackage Phosphor-Converted LEDs for Yellow Photolithography Room Lamp
Ji Hye Oh,Yun Jae Eo,Su Ji Yang,Young Rag Do IEEE 2015 IEEE photonics journal Vol.7 No.2
<P>This paper introduces a multi-package light-emitting diode (LED) system with the ability to realize an efficient and good color quality yellow room lamp under a photolithography environment. Various yellow room LEDs were fabricated by combining two, three, and four packages among green (G), yellow (Y), amber (A), and red (R) phosphor-converted LEDs (pc-LEDs) capped with long-wavelength pass dichroic filters (LPDF). The values of luminous efficacy (LE), color rendering index (CRI), and color quality scale (CQS) of the nine combinations of multi-package pc-LEDs are compared and optimized for application to a yellow room lamp. The optical properties of the selected G-A-R multi-package LED are compared with those of fluorescent light tubes (FT) and a yellow fluorescent light tube (YFT), which are generally used in photolithography rooms. The proposed G-A-R multi-package LED provides high luminous efficacy of 100 lm/W and good color quality (CRI of 78 and CQS of 36) at correlated color temperature (CCT) and color coordinates similar to those of currently commercialized YFTs.</P>
Evaluation of new color metrics: guidelines for developing narrow-band red phosphors for WLEDs
Oh, Ji Hye,Eo, Yun Jae,Yoon, Hee Chang,Huh, Young-Duk,Do, Young Rag Royal Society of Chemistry 2016 Journal of materials chemistry. C, Materials for o Vol.4 No.36
<P>Phosphor-converted white-light-emitting diodes (pc-WLEDs) are rapidly becoming more popular in the lighting industry due to their energy savings, long lifetimes and environmentally friendly characteristics. The color rendering index (CRI, Ra) and the visual energy efficiency (luminous efficacy of radiation, LER) are the critical criteria to be considered when developing novel red phosphors for use in warm white pc-WLEDs to replace incandescent and fluorescent lamps. In this regard, narrow-band red-emitting materials have been intensively developed in terms of the CRI and LER in an effort to complement the red deficiency of the widely commercialized Y3Al5O12: Ce3+ (YAG) phosphor-based pc-WLEDs. However, CRIs are limited in their inability to guarantee good saturated colors of illuminated objects under a warm white color. Instead of using CRI values as criteria, a two-measure system encompassing the color fidelity score (R-f) and the color gamut score (R-g) was developed and adopted as Illuminating Engineering Society of North America (IES) technical memorandum TM-30-2015 for correct evaluations of the color rendition and to guide the optimization of LED light sources. In this review, we summarize the recent findings on novel narrow-band red phosphors, the improved color and visual energy properties of these phosphors, and their ability to improve the optical properties of corresponding warm white pc-WLED lightings. To solve the complex problem of overestimation of high-CRI values, we discuss the ways in which the narrow-band red phosphors affect the new color metrics (R-f, R-g, and color icon) and the LERs of tri-color pc-WLEDs while varying the narrow scale and the blue-shifted peak position of red phosphors. These new color metrics and LER criteria provide guidelines with which many material and chemistry researchers can develop new red phosphors by optimizing the crystal structure, crystal rigidity, local symmetry, the number of available sites for activators, the selection of the host and activator, and other factors.</P>
Cu<SUB>2</SUB>ZnSnSe<SUB>4</SUB> 박막 태양전지 내 전류 차단층이 미치는 영향에 대한 전기적 특성 분석
문지현(Jihyun Moon),최혜림(Hye Rim Choi),곽지혜(Jihye Gwak),김기환(Kihwan Kim),윤재호(Jae Ho Yun),조아라(Ara Cho),어영주(Young Ju Eo),조준식(Jun-Sik Cho),안세진(SeJin Ahn),박주형(Joo Hyung Park),유진수(Jin Su Yoo),남다현(Dahyun Nam),정현식 한국신재생에너지학회 2017 한국신재생에너지학회 학술대회논문집 Vol.2017 No.9