• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2009년도 추계학술대회 논문집
• /
• pp.687-688
• /
• 2009

• 한국표면공학회:학술대회논문집
• /
• 한국표면공학회 2013년도 춘계학술대회 논문집
• /
• pp.106-106
• /
• 2013

C/C Composite는 비교적 낮은 온도에서 산화되어 고유의 특성을 쉽게 잃어버리게 된다. 본 연구에서는 Plasma Spray 코팅방법을 사용하여 다층 코팅층을 형성 시킨 후 $1600^{\circ}C$의 온도에서 열충격 저항성을 평가하였다.

• 한국광학회:학술대회논문집
• /
• 한국광학회 2003년도 하계학술발표회
• /
• pp.6-7
• /
• 2003

The inertial fusion research at ILE, Osaka moves to the fast ignition scheme with using PW laser system to achieve hot core plasma of keV-temperature by heating additionally the dense plasma imploded by the multi-beam Gekko laser system. The solid-state lasers have been developed of the peak-power from TW to PW region with the chirped pulse amplification (CPA) and optical parametric amplification (OPA) technology. (omitted)

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제55권6호
• /
• pp.314-324
• /
• 2006

In recent years, having the advantages of being small, low in cost and high in efficiency, Half-wave resonant type, (having only one output diode), is used in ZVS Half-Bridge DC/DC converter. This paper presents the operation mode by multi-resonant factors in the Half-wave type multi-resonant converter with direct Buck chopper circuit operated in discontinuous current mode. To study the characteristics of a multi-resonant operation in steady-state, the characteristic impedances in each mode and safe operation-region(S.O.R) are reported. Computer simulation and experimental data are also riven to verify the theoretical results.

• 대한전기학회논문지:전기물성ㆍ응용부문C
• /
• 제52권11호
• /
• pp.496-500
• /
• 2003

A low-cost, large area, random, maskless texturing scheme independent of crystal orientation is expected to significantly impact terrestrial photovoltaic technology. We investigated silicon surface microstructures formed by reactive ion etching (RIE) in Multi-Hollow cathode system. Desirable texturing effect has been achieved when radio-frequency (rf) power of about 20 Watt per one hollow cathode glow is applied for our RF Multi-Hollow cathode system. The black silicon etched surface shows almost zero reflectance in the visible region as well as in near IR region. The etched silicon surface is covered by columnar microstructures with diameters from 50 to 100 nm and depth of about 500 nm. We have successfully achieved 11.7% efficiency of mono-crystalline silicon solar cell and 10.2% multi-crystalline silicon solar cell.

• International Journal of Advanced Culture Technology
• /
• 제4권2호
• /
• pp.27-33
• /
• 2016

This paper proposes to increase the node energy efficiency, which rapidly drops during the transmission of L-TEEN (Layered Threshold sensitive Energy Efficient sensor Network protocol), using the method of DL-TEEN (Dual-hop Layered TEEN). By introducing dual-hop method in the data transmission, the proposed single-hop method for short-range transmission and multi-hop transmission method between the cluster heads for remote transmission was introduce. By introducing a partial multi-hop method in the data transmission, a single-hop method for short range transmission method between the cluster heads for remote transmission was introduces. In the proposed DL-TEEN, the energy consumption of cluster head for remote transmission reduces and increases the energy efficiency of sensor node by reducing the transmission distance and simplifying the transmission routine for short-range transmission. As compared the general L-TEEN, it was adapted to a wider sensor field.

• International journal of advanced smart convergence
• /
• 제5권2호
• /
• pp.24-37
• /
• 2016

This paper proposes to increase the efficiency of energy in nodes, which rapidly drops during the transmission of the Low Energy Adaptive Clustering Hierarchy (LEACH), through the use of dual-hop layered application in the sensor field. Along with introducing the dual-hop method in the data transmission, the proposed single-hop method for short-range transmission and multi-hop transmission method between the cluster heads for remote transmission were also introduced. Additionally, by introducing a partial multi-hop method in the data transmission, a single-hop method for short range transmission method between the cluster heads for remote transmission was used. In the proposed DL-LEACH, the energy consumption of the cluster head for remote transmission reduced, as well as increased the energy efficiency of the sensor node by reducing the transmission distance and simplifying the transmission route for short-range transmission. As compared the general LEACH, it was adapted to a wider sensor field.

• 분석과학
• /
• 제15권4호
• /
• pp.335-340
• /
• 2002

유도결합 플라스마 질량분석법 (ICP-MS)을 이용하여 모발 중 다원소 동시 정량법을 확립하였다. 0.05 g의 모발 시료에 내부표준물질인 In을 가하고 질산 1.5 mL와 함께 테플론 가압분해 용기에 넣어 마이크로파를 이용하여 분해하는 시료전처리법을 사용하였다. 측정값의 정확도 및 신뢰도를 확인하기 위하여 모발 인증표준물질인 GBW 09101을 반복 분석하였는데 측정값은 인증값과 불확도 범위 내에서 잘 일치하는 결과를 얻었다.

• 한국진공학회:학술대회논문집
• /
• 한국진공학회 2012년도 제42회 동계 정기 학술대회 초록집
• /
• pp.176-176
• /
• 2012

다수 홀 전극을 이용한 RF Capcitively Coupled Plasma는, 평판 전극을 이용할 때에 비해, 전자 밀도를 향상시키는 것으로 알려져 있다. 이와 같은 전자 밀도의 증가는 일반적으로 공정의 속도를 증가시키며, 박막 태양전지의 Microcrystalline Silicon 증착 공정등 공정의 속도가 중요시되는 공정에서는 공정속도를 향상 시키는 것이 중요한 공정의 요구사항으로, 이와 같은 방법으로 전자 밀도를 향상시켜 공정의 속도를 향상시키는 연구가 진행되어 왔다. 그러나 공정에 사용하는 RF 전력의 파장의 유한성으로 인해, 공정의 면적을 증가시킬 경우, 방전의 균일도가 하락하게 되며 넓은 면적에 일정한 공정이 이루어지지 않게 되어 공정의 품질이 하락하게 된다. 이러한 문제에 대한 해결책의 하나로 본 발표에서는 다중 Multi-hole 전극을 이용한 방전을 제시하고자 한다. 다중 Multi-hole 전극은, 복수의 구획으로 나뉘어진 다수의 홀이 있는 전극으로 각각의 구획은 분리되어, 각 구획 별로 서로 다른 복수의 홀이 10 mm 깊이로 뚫린 전극 구획으로 나누어지며, 각 구획을 결합하여 하나의 전극을 이루도록 한 전극이며 이를 이용하여 위치 별 플라즈마 밀도를 제어하고자 하는 목적으로 설계되어진 전극 구조이다. 본 학회에서 발표하는 실험에서는 가장 단순한 형태인, 두 개의 구획으로 나뉘어진 전극을 이용하여 내부와 외부에, 평 전극 구획 혹은 5 mm 지름의 다수 홀이 존재하는 전극 구획을 조합하여 다양한 전극 구조를 만들었으며 이를 통해, 다중 Multi-hole 전극을 이용하는 위치 별 플라즈마 밀도의 제어 방법의 가능성을 확인하고자 하였다. 위치 별 플라즈마 밀도의 측정을 위해, 전극에 대해 수평하게 이동하는 RF compensated Single Langmuir Probe를 이용하여, 전자 밀도를 측정하였으며 50 mTorr의 낮은 압력 범위 및 500 mTorr의 높은 압력 범위에서 위치 별 플라즈마 밀도를 측정하여, 압력에 따라 달라지는 홀 방전의 특성을 이용하고자 하였다.

• Medical Lasers
• /
• 제9권1호
• /
• pp.12-24
• /
• 2020

Human fibroblast-derived multi-peptide factors (MPFs) have been used during treatments with energy-delivering modalities to enhance energy-induced tissue reactions. Human fibroblast-derived MPFs, which include a range of growth factors and chemoattractive factors, activate and recruit fibroblasts and endothelial cells, as well as promote extracellular matrix deposition, all of which are crucial to wound repair. Interestingly, fibroblasts from different species or anatomical sites exhibit distinct transcriptional properties with high heterogeneity. In addition, the patterns of MPF secretion can differ under a range of experimental conditions. Therefore, the use of allogeneic fibroblasts and proper cultivation thereof are necessary to obtain MPFs that can enhance the epithelial-mesenchymal interactions during wound repair. Moreover, energy-delivering devices should be selected according to evidence demonstrating their therapeutic efficacy and safety on a pathological skin condition and the major target skin layers. This paper reviewed the histologic patterns of post-treatment tissue reactions elicited by several energy sources, including non-ablative and ablative fractional lasers, intense focused ultrasound, non-invasive and invasive radiofrequency, picosecond-domain lasers, and argon and nitrogen plasma. The possible role of the immediate application of human fibroblast-derived MPFs during wound repair was proposed.