Effect of the Plasma-assisted Patterning of the Organic Layers on the Performance of Organic Light-emitting Diodes

홍용택,이창희,양지훈,곽정훈 한국정보디스플레이학회 2009 Journal of information display Vol.10 No.3

In this paper, a plasma-assisted patterning method for the organic layers of organic light-emitting diodes (OLEDs) and its effect on the OLED performances are reported. Oxygen plasma was used to etch the organic layers, using the top electrode consisting of lithium fluoride and aluminum as an etching mask. Although the current flow at low voltages increased for the etched OLEDs, there was no significant degradation of the OLED efficiency and lifetime in comparison with the conventional OLEDs. Therefore, this method can be used to reduce the ohmic voltage drop along the common top electrodes by connecting the top electrode with highly conductive bus lines after the common organic layers on the bus lines are etched by plasma. To fur-ther analyze the current increase at low voltages, the plasma patterning effect on the OLED performance was investigated by changing the device sizes, especially in one direction, and by changing the etching depth in the vertical direction of the device. It was found that the current flow increase at low voltages was not proportional to the device sizes, indicating that the current flow increase does not come from the leakage current along the etched sides. In the etching depth experiment, the current flow at low voltages did not increase when the etching process was stopped in the middle of the hole transport layer. This means that the current flow increase at low voltages is closely related to the modification of the hole injection layer, and thus, to the modification of the interface between the hole injection layer and the bottom electrode.

변형 근치 유방절제술 후 Becker 확장형 보형물을 이용한 유방 재건술

홍용택,윤을식,최규진,동은상,손길수 대한성형외과학회 2007 Archives of Plastic Surgery Vol.34 No.2

Purpose: Report of the good results of breast reconstruction using Becker permanent tissue expander that showed a short operation time and a quick post- operation recovery time, little side effects and usually superb aesthetic results without the need for additional incisions or donor site morbidity. The authors, after carrying out breast reconstruction operations using Becker permanent tissue expander on patients with appropriate indications, attempted to analyze several factors such as complication rates and patient satisfaction measurements.Methods: 11 cases of breast reconstruction using Becker expander implants were carried out on a total of 10 patients between March 2000 and February 2003. The patients were followed up at outpatient visit for an average of 6 months.Results: The most common post-operation complication was pain resulting from saline injection into the expanders, complained by 5 patients(50%). rib fractures, skin necrosis, implant removal due to infection, and breast cancer recurrence each occurred in 1 patient (9.9%). There was no occurrence of skin contracture complications which occurs frequently in case of silicone implant insertion. Patient complacency was surveyed by patient interviews made right after the operations and during outpatient follow-up periods: 5(50%) patients out of 10 showed excellent, 3(30%) good, and 2(20%) showed fair, leaving no patients who were disappointed with operation results. On routine follow-up, 80% of patients expressed satisfaction with the cosmetic outcome of their post-mastectomy beast reconstruction. Conclusion: Breast reconstruction using the Becker expander is a reliable alternative to other reconstructive methods but good patient selection is essential for satisfactory results.

고속의 실시간 MPEG-2/H.264 transcoding 구조 제안

홍용택,이경호,김진상,조원경 경희-다반 ASIC 설계교육센터 2006 경희-다반 ASIC센터 논문집 Vol.7 No.-

H.264 비디오 코딩 표준은 기존 비디오 코딩 표준에 비해 뛰어난 압축부호화 효율로 인해 차세대 비디오 표준으로 각광받고 있으며 H.264가 가진 잠재적인 영향력 때문에 오늘날 디지털 비디오 시스템의 주를 이루고 있는 MPEG-2 시스템을 대체할 것으로 보여진다. 현재 MPEG-2 시스템이 광범위하게 자리 잡고 있기 때문에 H.264 시스템으로의 완전한 이동은 다소 시간이 걸릴 것으로 예상되고, 따라서 트랜스코딩 기술이 중요하게 대두되고 있다. 트렌스코더는 디코더와 인코더를 포함한 구조이기 때문에 매우 많은 연산량이 요구되며 그 복잡도를 줄이는 것이 중요하다. 본 논문에서는 디코딩 과정에서 추출된 정보를 인코딩 과정에 재사용함으로써 복잡도를 줄이도록 하였고, 또한 H.264에서 연산량이 많은 부분들을 여러 가지 알고리즘을 통해 복잡도를 줄임으로써 보다 빠른 속도로 동작이 가능한 트랜스코더 구조를 제안하였다.

고속의 실시간 MPEG-2/H.264 transcoding 구조 제안

홍용택,이경호,김진상,조원경 경희대학교 경희정보통신 SoC연구소 2006 경희정보통신SOC연구소 논문집 Vol.7 No.-

혈액은행 혈소판농축액의 혈소판유래성장인자 분비능

홍용택,한승규,이병일,김우경 대한성형외과학회 2006 Archives of Plastic Surgery Vol.33 No.6

Purpose: The purpose of this pilot study was to investigate a potential of platelet concentrate obtained from blood bank(PCBB) in accelerating wound healing and to determine an effective treatment protocol by quantifying levels of platelet derived growth factor (PDGF)-BB in PCBB in vitro.Methods: The first study was designed to investigate quantity of PDGF-BB over stored time of the PCBB. The stored times for each PCBB were 1, 3, 5, 7, 9, 11 and 13 days. The second study was designed to determine efficacy of adding thrombin to stimulate release of PDGF-BB from the platelets of PCBB. The platelets were suspended and incubated in either with or without thrombin. On 30 minutes and days 1, 3, 5, 7 after incubation, the levels of PDGF-BB were measured. Results: PDGF-BB level showed a linear decrease over stored time of PCBB from the first day to the 13th day. Addition of thrombin increased PDGF-BB release from 30 minute through the 5th day. Conclusion: The results indicate that PCBB can provide sufficient amount of growth factors to stimulate wound healing and adding thrombin accelerate it.

T-CAM이나 Regenin을 함유한 키토산 스폰지의 창상치유 효과

홍용택,서만수,류형호,박세정,조병채,양정덕,김종엽,정호윤,이동걸,김인산,김상우,배은희,이동신 대한성형외과학회 2004 Archives of Plastic Surgery Vol.31 No.4

비첨성형술에 사용된 알로덤의 조직학적 변화 및 사진 계측 분석

홍용택,박승하,구상환,김세영 대한미용성형외과학회 2006 Archives of Aesthetic Plastic Surgery Vol.12 No.2

AlloDerm is human cadaveric dermis that has been decellularized. It is easy to handle and simple to use, and has superb tissue compatibility; hence it has been used in several fields. But studies about the effect and the histologic changes of AlloDerm in soft tissue augmentation are lacking. We measured the heights of pronasale and supretip breakpoint through Pre-and post- operative photographs in 13 patients who had undertaken AlloDerm tip plasty surgery from April 2004 to July 2005. Histologic changes were investigated by H&E and CD34 immunochemistry staining of tissue samples from 10 patients who had AlloDerm removed by re-operative procedures from January 2005 to March 2006. The result of photographic analysis is as follows supratip breakpoint heights were 2.43±0.36, 2.64±38, 2.52±0.38mm in the pre-operative(T1), early post-operative(T2) and late post-operative(T3) periods, respectively. Pronasale heights were 2.68±0.33, 2.93±0.44, and 2.79±0.38mm, respectively. Statistical analysis of corrective value of T1-T2, T2-T3 and T1-T3 revealed a statistically significant difference in both pronasale and supratip breakpoint heights. Histological analysis showed chronic inflammatory signs with foreign body reactions around grafted AlloDerm. We concluded that AlloDerm neovascularization and fibroblast ingrowth were also noted. AlloDerm is effective in raising the nasal tip, but considering the late-term partial absorption, an overcorrection of about 50% is recommended.

2LM-1 신축성 LED 디스플레이를 위한 핵심 기술

홍용택 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1

신축성 LED 디스플레이 및 하이브리드 전자 시스템 구현을 위한 핵심 기술인, 기판의 스트레인 분포를 제어한 신축성 PCB 플랫폼 기술, 잉크젯 인쇄 기반의 신축성 전극과 cross-over 절연막 기술, 안정적인 칩 본딩 기술, 그리고 점진적인 모듈러스 변화 기능이 있는 코어-쉘 구조의 비아 기술 등에 대해서 논의한다. 버클링 구조가 내재된 잉크젯 인쇄 공정으로 제작된 은전극은 탁월한 신축성 특성을 보였고, 이를 통해 신축성 LED 디스플레이, 아날로그 시계, 센서/디스플레이 집적 시스템 구현 등을 시연했으며, 이러한 신축성 하이브리드 전자 시스템은 일반적인 웨어러블 응용에서 요구되는 30% 이내의 임의의 기계적 연신 조건에서도 안정적 동작을 보여 준다. 보다 자세한 기술과 시연된 시스템의 성능에 관해서는 논문 발표에서 더 자세하게 다루도록 한다. ^**This work was supported by the Center for Advanced Soft-Electronics funded by the Ministry of Science, ICT and Future Planning as Global Frontier Project (CASE-2015M3A6A5065309).

가을 환절기 농장관리 점검 - 환절기 종계 사양관리 포인트

홍용택,Hong, Yong-Taek 대한양계협회 2022 월간 양계 Vol.54 No.9

플렉시블 a-Si:H TFT Backplane 기술 동향

홍용택,Hong, Yong-Taek 한국전기전자재료학회 2008 전기전자재료 Vol.21 No.9