• Archives of Plastic Surgery
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• 제34권2호
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• pp.176-180
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• 2007

Purpose: Pitanguy conducted a series of anatomical studies on "dermocartilaginous ligament" of the nose. However, information on its structure is as yet insufficient, especially in terms of its origin, insertion, and relationships with surrounding tissues. In addition, some of the histologic findings described by Pitanguy are controversial. The present study was undertaken to clarify the anatomy of the "dermocartilaginous ligament". Methods: Sixteen cadaver noses were examined macroscopically and histologically to determine the presence, origin, insertion, composition, and relationship of the "dermocartilaginous ligament" with surrounding structures. Results: The structure originated from the deep layer of the transverse nasalis muscle and terminated at the caudal edge of the septal cartilage in all 16 cadavers. However, in three cadavers the insertion extended to the orbicularis oris muscle. No direct connection was found between the structure and dermis of dorsal nasal skin. The dermocartilaginous ligaments were mainly composed of a condensation of thin collagen bundles, which were interwoven and without any regular orientation. Elastic fibers were also present in small numbers, and there were few amorphous ground substances. Neither muscle fibers nor chondrocytes was identified within dermocartilaginous ligaments. Conclusion: Our macroscopic and histologic findings of the structure do not support the use of the term "dermocartilaginous ligament". According to its origin, insertion, and histologic findings, we recommend that this structure be referred to as the "median musculocartilaginous fascia".

• Transactions on Electrical and Electronic Materials
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• 제13권2호
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• pp.60-63
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• 2012

Enhancement of efficiency and luminance of organic light-emitting diodes was investigated by the introduction of a lithium carbonate ($Li_2CO_3$) electron-injection layer. Electron-injection layer is used in organic light-emitting diodes to inject electrons efficiently between a cathode and an organic layer. A device structure of ITO/TPD (40 nm)/$Alq_3$ (60 nm)/$Li_2CO_3$ (x nm)/Al (100 nm) was manufactured by thermal evaporation, where the thickness of $Li_2CO_3$ layer was varied from 0 to 3.3 nm. Current density-luminance-voltage characteristics of the device were measured and analyzed. When the thickness of $Li_2CO_3$ layer is 0.7 nm, the current efficiency and luminance of the device at 8.0 V are improved by a factor of about 18 and 3,000 compared to the ones without the $Li_2CO_3$ layer, respectively. The enhancement of efficiency and luminance of the device with an insertion of $Li_2CO_3$ electron-injection layer is thought to be due to the lowering of an electron barrier height at the interface region between the cathode and the emissive layer. This is judged from an analysis of current density-voltage characteristics with a Fowler-Nordheim tunneling conduction mechanism model. In a study of lifetime of the device that depends on the thickness of $Li_2CO_3$ layer, the optimum thickness of $Li_2CO_3$ layer was obtained to be 1.1 nm. It is thought that an improvement in the lifetime is due to the prevention of moisture and oxygen by $Li_2CO_3$ layer. Thus, from the efficiency and lifetime of the device, we have obtained the optimum thickness of $Li_2CO_3$ layer to be about 1.0 nm.

• Clinics in Shoulder and Elbow
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• 제25권2호
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• pp.93-100
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• 2022

Background: Subscapularis tendon insertion at the first facet has separate layers (deep and superficial). The purpose of this study is to evaluate postoperative clinical outcomes and radiological healing according to each layer of detachment in the first facet involving subscapularis tendon tear. Methods: Eighty-three patients who underwent arthroscopic repair due to First facet involving the scapularis tendon tear accompanying small to medium sized posterosuperior cuff tear were classified into three groups (group A: deep layer partial detachment, group B: deep layer complete detachment, but no superficial layer detachment, and group C: deep layer and superficial layer complete detachment). Subscapularis tendon healing was evaluated using computed tomography arthrogram and clinical result was evaluated using American Shoulder and Elbow Surgeons (ASES) shoulder score, Constant score and University of California Los Angeles (UCLA) shoulder score. Results: Retear rate of the subscapularis tendon was 2.2%, 18.2%, and 33.3% in group A, group B, and group C, respectively. These rates showed statistically significant difference among the three groups, which were classified by deep and superficial layer detachment in the first facet (p=0.003). Group A showed significant difference in subscapularis tendon healing compared with group B and group C (p=0.018 and p<0.001, respectively), but there was no statistical difference between group B and group C (p=0.292). Regarding clinical outcomes, there was no significant difference among three groups in ASES and UCLA score at final follow-up (p=0.070 and p=0.106, respectively). Conclusions: Complete detachment of deep layer may be related with retear occurrence regardless with detachment of superficial layer, but clinical outcome may not be related with each layer detachment in the first facet involving subscapularis tendon tear.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
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• pp.275.1-275.1
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• 2014

The effects of the interfacial buffer layer and temperature on the organic bulk heterojunction (BHJ) nanostructures of copper phthalocyanine (CuPc) and fullerene (C60) systems were investigated using real time in-situ x-ray scattering. In the CuPc:C60 BHJ structures, standing-on configured ${\gamma}$-CuPc phase was formed by co-deposition of CuPc and C60. Once formed ${\gamma}$-phase was thermally stable during the annealing upon $180^{\circ}C$. Meanwhile, the insertion of CuI buffer layer prior to deposition of the CuPc:C60 BHJ layer induced lying-down configured CuPc crystals in the BHJ layer. The lying CuPc peak intensity and the lattice parameter were increased by the thermal annealing. This increment of the intensity seemed to be related to the strain at the interface between CuPc:C60 and CuI, which was proportional to the enhancement of the power conversion efficiency of the device.

• 한국전자파학회논문지
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• 제15권2호
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• pp.172-177
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• 2004

본 논문에서는 기존의 DGS를 LTCC 공정기술을 이용해서, 적층구조에 적용해 보았다. 크기 축소 및 품질계수를 높이기 위해서 나선형 DGS를 사용하였으며, 적층 구조에서 기존의 DGS와 같은 공진 특성을 나타내는 것을 확인하였다. 2개의 나선형 DGS를 결합하여, 새로운 형태의 2단 적층 대역통과 여파기를 구성하였으며, 공정상의 편의를 위해서 비아(Via-Hole)가 없도록 설계하였다. 5.25 GHz 대역 무선랜용 대역통과 여파기를 설계 제작하였으며, 제작한 여파기의 삽입손실은 1.5 dB 이내이며, 크기는 2.0 mm${\times}$1.2 mm${\times}$1.1 mm(L${\times}$W${\times}$H)로 저손실의 초소형 여파기 제작에 적합함을 확인하였다.

• 한국자기학회지
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• 제9권6호
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• pp.306-311
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• 1999

Water-based sol-gel 법으로 La2/3Sr1/3MnO3(LSMO)/YSZ/SiO2/Si(100) 다결정체 박막을 제조하여 YSZ 중간층 도입에 따른 상온, 120 Oe의 저 자장영역에서 측정한 tunnel-type 자기저항 변화에 미치는 영향에 대하여 고찰하였다. 페롭스카이트 단일상을 갖는 미세한 LSMO 박막을 얻을 수 있었으며, YSZ 중간층을 도입하지 않은 박막의 자기저항 변화비는 최대 약 0.20%이었으나, YSZ 중간층을 도입한 경우 자기저항비가 0.42%로 증가하였다. 이러한 tunnel-type 자기저항의 증가 현상은 YSZ 중간층이 SiO2/Si(100) 기판과 La2/3Sr1/3MnO. 자성박막 사이에서 확산 장벽층으로서의 역할을 수행하여 LSMO 박막의 미세구조 특성 향상 및 확산반응에 의하여 생성된 dead layer를 감소시켜 나타난 결과이다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제43회 하계 정기 학술대회 초록집
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• pp.413-413
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• 2012

Lead sulfide (PbS) Colloidal quantum dots (CQDs) are promising material for the photovoltaic device due to its various outstanding properties such as tunable band-gap, solution processability, and infrared absorption. More importantly, PbS CQDs have large exciton Bohr radius of 20 nm due to the uniquely large dielectric constants that result in the strong quantum confinement. To exploit desirable properties in photovoltaic device, it is essential to fabricate a device exhibiting stable performance. Unfortunately, the performance of PbS NQDs based Schottky solar cell is considerably degraded according to the exposure in the air. The air-exposed degradation originates on the oxidation of interface between PbS NQDS layer and metal electrode. Therefore, it is necessary to enhance the stability of Schottky junction device by inserting a passivation layer. We investigate the effect of insertion of passivation layer on the performance of Schottky junction solar cells using PbS NQDs with band-gap of 1.3 eV. Schottky solar cell is the simple photovoltaic device with junction between semiconducting layer and metal electrode which a significant built-in-potential is established due to the workfunction difference between two materials. Although the device without passivation layer significantly degraded in several hours, considerable enhancement of stability can be obtained by inserting the very thin LiF layer (<1 nm) as a passivation layer. In this study, LiF layer is inserted between PbS NQDs layer and metal as an interface passivation layer. From the results, we can conclude that employment of very thin LiF layer is effective to enhance the stability of Schottky junction solar cells. We believe that this passivation layer is applicable not only to the PbS NQDs based solar cell, but also the various NQDs materials in order to enhance the stability of the device.

• 한국자기학회지
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• 제4권1호
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• pp.20-24
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• 1994

CoCr/NiFe 이중매체의 기록, 재생특성은 CoCr 기록층뿐만 아니라 NiFe연자성층의 자기적 특성에도 강하게 영향을 받는다. NiFe/Ge의 다층화로 CoCr/NiFe 매체의 기록감도와 재생전압을 증 가시킬 수 있었으며 이것은 연자성층의 높은 투자율과 CoCr기록층의 높은 수직이방성에 기인하였다. 그러나 연자성층의 투자율의 향상이 기록감도의 현저한 향상에 비해 재생전압의 현저한 증가를 가 져오지 못하는데 이것은 유한요소수치해석에서도 확인할 수 있었다. 반면에 NiFe/Ge 다층연자성박 막을 사용한 CoCr/NiFe 매체의 피크이동(peak shift)특성은 NiFe 단층연자성박막을 사용한 CoCr/NiFe 매체에 비해 악화되었다. 그러나 CoCr층과 NiFe층 사이에 10 nm의 CoZrNb 박막을 삽입시키면 높은 재생전압과 낮은 파크이동을 동시에 얻을 수 있었다. 이 연구에서 는 이러한 기록, 재생특성을 미 세구조와 연관시켜 검토하였다.

• 지구물리와물리탐사
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• 제15권4호
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• pp.155-162
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• 2012

기반암의 상부 토양층에 협재하는 속도이상층이 레일리파 위상속도와 수직변위의 스펙트럼 진폭에 미치는 영향을 분석하기 위하여 Thomsen-Haskell 방법을 사용하였다. 기본모델은 횡파속도(${\nu}_s$) 300 m/s의 토양층이 9 m 두께로 ${\nu}_s$가 1000 m/s인 반무한 기반암 위에 쌓여 있다. 토양층 내에 두께 1, 2, 3 m, S파속도 150, 225, 375, 450 m/s인 삽입층은 지표부터 깊이 1 m 간격으로 놓여있다. 레일리파 위상속도($C_R$)는 4 ~ 30 Hz 주파수 구간에서 계산하였다. 삽입층 모델은 두께가 1 m일 때, 기본모델과 삽입모델의 위상속도 차이인 ${\Delta}C_R$에 민감하게 반응하는 주파수 대역은 8 ~ 20 Hz이며, 이 주파수 대역은 삽입층의 두께가 증가할수록 넓어진다. 1차 고차모드의 저주파 차단주파수 바로 위의 주파수 구간을 제외하면, 모든 모델에서 기본모드의 스펙트럼 진폭이 1차 고f차모드보다 크다.

• 마이크로전자및패키징학회지
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• 제11권2호
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• pp.43-47
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• 2004

전력 결합기 및 전력 배분기는 마이크로파 수동 소자의 일종으로 전력을 결합하거나 나눌 때 쓰이는 것이다. 최근의 정보통신 시스템의 추세를 보아 수동 소자의 집적화 및 소형화가 요구된다. 본 연구에서는 이러한 추세를 감안하여 2012 크기의 다층 구조를 적용한 양대역 방향성 결합기를 저온 동시소성 기술을 활용하여 제작하였다. DCS(Digital communication system)와 EGSM(European global system for mobile) 대역에서 각기 원하는 커플링을 얻기 위해서 수직 결합 패턴들을 다층 구조에 적용하였다. 제작된 방향성 결합기의 결합성, 삽입 손실, 격리성 및 방향성 등의 특성들을 측정하였고 시뮬레이션 결과들과 비교 고찰하였다.