숯을 이용한 견직물의 염색

조원주 韓國衣類學會 2005 한국의류학회지 Vol.29 No.2

해금과 바이올린 음색에 대한언어적 표현 분석

조원주,김준 한양대학교 음악연구소 2013 音樂論壇 Vol.30 No.-

This study is Korean traditional instrument, Haegum’s verbal expression through the comparison of Haegum and Violin. The expressions of Haegum are reported as rough, clear, and taut. The other hand, that of Violin are described as soft, unclear, and relaxed. These timbral features are consistent with spectral analysis. And it is an important result in objectification. 본 연구는 국악기 해금 음색의 언어적 표현에 관한 연구이다. 12명의 피험자를대상으로 실시한 해금과 바이올린의 비교를 통해 해금의 음색적 특징을 고찰하였다. 그 결과 해금은 거칠고, 명확하며, 긴장된 음색을, 바이올린은 상대적으로부드럽고, 희미하며, 이완된 특징을 가진 것으로 나타났다. 이러한 음색의 특성은 해금 스펙트럼 분석에서도 정확히 나타나고 있어 음색표현 객관화에 중요한결과를 보여준다.

성인 남성에서 성호르몬과골대사 지표와의 관련성

조원주,허재훈,김문종,강영곤,박경채,김소림,신경균,이영진 대한가정의학회 2004 Korean Journal of Family Medicine Vol.25 No.8

Poly(lactic acid)와 Nanomer®I.44P를 이용한 친환경 나노복합체 개발

조원주,황기,김준태 한국포장학회 2014 한국포장학회지 Vol.20 No.3

PLA와 nanoclay인 Nanomer® I.44P를 이용한 환경 친 화적인 nanocomposites을 개발하였다. PLA/Nanomer® I.44P nanocomposites의 상온 건조 후 잔존하는 용매를 제 거하기 위해 진공건조를 하였으며, 진공건조 시간이 8시간 까지는 신장율이 크게 감소하였으며, 그 이후에는 유의적인 차이가 없었다. Nanoclay가 PLA matrix내에서 균일하게 분산시키기 위해 초음파 처리를 하였으며, 초음파 처리시간 이 5분까지는 인장강도 및 영모듈러스가 증가하는 경향을 보였으나 5분 이상의 초음파 처리에서는 시간이 증가함에 따라 인장 특성도 점차 감소하였고, 특히 15분 이상 초음 파 처리를 하였을 때에는 nanoclay가 뭉치는 현상이 관찰 되었다. Nanoclay의 양이 증가할수록 nanocomposites의 가 시광선 영역에서의 투과성(trasmittance)은 62.5%에서 7.8% 로 크게 감소하였다. Water vapor permeability (WVP)는 nanoclay의 첨가량에 따라 감소하는 경향을 보이며, 5%의 nanoclay 첨가 시 3.5×10-11g·m/m2·s·Pa로 control에 비해 약 43%가 감소하였다. Biodegradable nanocomposites were fabricated with poly (lactic acid) (PLA) and Nanomer® I.44P using ultrasonication (US). Processing conditions were optimized to obtain the maximum tensile properties of the nanocomposites. Poly (ethylene glycol) (PEG) was used as a plasticizer to avoid the brittleness of nanocompsoties. In order to disperse nanoclay into the PLA matrix, PEG and Nanomer® I.44P were firstly mixed and dispersed in the chloroform and followed by ultrasonication for 1 min With 10% PEG 400, tensile stress and Young’s modulus of the nanocomposites decreased from 53.5 MPa and 2225 MPa to 37.0 MPa and 1757 MPa, respectively, while the elongation was increased from 4% to 21%. Tensile stress, Young’s modulus, and elongation of nanocomposites were also increased with nanoclay concentration up to 2% (w/w) and were decreased with further increase in the nanoclay concentration. Transmittance of nanocomposites were significantly decreased from 62.5% for pure PLA film to 7.8% for 5% nanoclay containing nanocomposites. Water vapor permeability of the nanocomposites was also significantly decreased with nanoclay concentration and the minimum WVP of 3.5×10-11g·m/m2·s·Pa was obtained with 5% (w/w) nanoclay concentration. The PLA/Nanomer® I.44P nanocomposites showed a great potential as a environmental friendly food packaging material.

Effects of Metal Silicide/Silicon Interface Trap Distribution on Schottky Barrier MOSFET Devices

조원주,Chang-Geun Ahn 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.III

We present simulation results for Schottky junction diodes and Schottky barrier metal-oxide-semiconductor field-effect transistors (SB-MOSFETs) for post-CMOS devices. By using an abrupt metal/silicon Schottky junction at the source/drain region, short-channel effects in nano-scale MOSFET devices can be avoided. In particular, the effects of trap density at the metal silicide/silicon interface were simulated by taking into account the tail distributions at the silicon band-edge position and the Gaussian distributions at the silicon midgap position. As a result, it is found that the reduction of interfacial states with Gaussian distribution is more important than that of the tail distribution on Schottky junction diodes and SB-MOSFETs.

신형 나노 메모리 기술

조원주,Jo, Won-Ju 한국전기전자재료학회 2008 전기전자재료 Vol.21 No.5

SiO₂/Si₃N₄ 터널 절연악의 적층구조에 따른 비휘발성 메모리 소자의 특성 고찰

조원주,Cho, Won-Ju 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.1

The electrical characteristics of band-gap engineered tunneling barriers consisting of thin $SiO_2$ and $Si_3N_4$ dielectric layers were investigated for nonvolatile memory device applications. The band structure of band-gap engineered tunneling barriers was studied and the effectiveness of these tunneling barriers was compared with the conventional tunneling $SiO_2$ barrier. The band-gap engineered tunneling barriers composed of thin $SiO_2$ and $Si_3N_4$ layers showed a lower operation voltage, faster speed and longer retention time than the conventional $SiO_2$ tunnel barrier. The thickness of each $SiO_2$ and $Si_3N_4$ layer was optimized to improve the performance of non-volatile memory.

Poly(lactic acid)와 Nanomer^®I.44P를 이용한 친환경 나노복합체 개발

조원주,황기,김준태,Cho, Won-Ju,Whang, Key,Kim, Jun Tae 한국포장학회 2014 한국포장학회지 Vol.20 No.3

Biodegradable nanocomposites were fabricated with poly (lactic acid) (PLA) and Nanomer$^{(R)}$ I.44P using ultrasonication (US). Processing conditions were optimized to obtain the maximum tensile properties of the nanocomposites. Poly (ethylene glycol) (PEG) was used as a plasticizer to avoid the brittleness of nanocompsoties. In order to disperse nanoclay into the PLA matrix, PEG and Nanomer$^{(R)}$ I.44P were firstly mixed and dispersed in the chloroform and followed by ultrasonication for 1 min With 10% PEG 400, tensile stress and Young's modulus of the nanocomposites decreased from 53.5 MPa and 2225 MPa to 37.0 MPa and 1757 MPa, respectively, while the elongation was increased from 4% to 21%. Tensile stress, Young's modulus, and elongation of nanocomposites were also increased with nanoclay concentration up to 2% (w/w) and were decreased with further increase in the nanoclay concentration. Transmittance of nanocomposites were significantly decreased from 62.5% for pure PLA film to 7.8% for 5% nanoclay containing nanocomposites. Water vapor permeability of the nanocomposites was also significantly decreased with nanoclay concentration and the minimum WVP of $3.5{\times}10^{-11}g{\cdot}m/m^2{\cdot}s{\cdot}Pa$ was obtained with 5% (w/w) nanoclay concentration. The PLA/Nanomer$^{(R)}$ I.44P nanocomposites showed a great potential as a environmental friendly food packaging material. PLA와 nanoclay인 Nanomer$^{(R)}$ I.44P를 이용한 환경 친화적인 nanocomposites을 개발하였다. PLA/Nanomer$^{(R)}$ I.44P nanocomposites의 상온 건조 후 잔존하는 용매를 제거하기 위해 진공건조를 하였으며, 진공건조 시간이 8시간 까지는 신장율이 크게 감소하였으며, 그 이후에는 유의적인 차이가 없었다. Nanoclay가 PLA matrix내에서 균일하게 분산시키기 위해 초음파 처리를 하였으며, 초음파 처리시간이 5분까지는 인장강도 및 영모듈러스가 증가하는 경향을 보였으나 5분 이상의 초음파 처리에서는 시간이 증가함에 따라 인장 특성도 점차 감소하였고, 특히 15분 이상 초음파 처리를 하였을 때에는 nanoclay가 뭉치는 현상이 관찰 되었다. Nanoclay의 양이 증가할수록 nanocomposites의 가시광선 영역에서의 투과성(trasmittance)은 62.5%에서 7.8%로 크게 감소하였다. Water vapor permeability (WVP)는 nanoclay의 첨가량에 따라 감소하는 경향을 보이며, 5%의 nanoclay 첨가 시 $3.5{\times}10^{-11}g{\cdot}m/m^2{\cdot}s{\cdot}Pa$로 control에 비해 약 43%가 감소하였다.

Wet or Dry 방식에 따른 극박 게이트 산화막의 전기적 특성 및 저온 Post Anneal 효과의 평가 ( Electrical Properties of Thin Gate Oxide Grown in Wet or Dry Ambient , and Effects of Low Temperature Post Anneal )

조원주,정종완,김용수 대한전자공학회 1997 대한전자공학회 학술대회 Vol.1997 No.11

Development of Arsenic Solid-Phase Diffusion (SPD) for Fabrication of SOI n-type FinFETs with 20-nm Gate Length

조원주 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.III

The solid-phase diffusion (SPD) process, which is suitable for the fabrication of fin field-effect-transistors (FinFETs) with gate length sub-100 nm, was developed for formation of ultra-shallow and abrupt $n^+$-$p$ junctions. Arsenic-doped spin-on-glass (SOG) or phosphorus-doped SOG films were used as $n$-type dopant sources, and rapid thermal annealing (RTA) was performed to diffuse dopants to the source/drain extensions of FinFETs. Arsenic-doped SOG showed a more abrupt doping profile, a higher doping concentration at the surface, and a shallower junction depth than phosphorus-doped SOG. $N^+$-$p$ junction diodes fabricated by the SPD process showed ideal one-sided abrupt-junction properties. Especially, FinFETs with a gate length of 20 nm were successfully fabricated by using the arsenic-SPD process to control the lateral source/drain junction depth and showed excellent short-channel properties.