Use of a Neural Network to Model the Carrier Life Time of Silicon-Nitride Films Deposited by Using PECVD

권민지,Byungwhan Kim,Gary S. May 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.5

Silicon-nitride films were deposited by using a plasma-enhanced chemical vapor deposition (PECVD) system. For a systematic modeling, the PECVD process was characterized by means of a statistical experiment. Using a neural network, an effective lifetime was modeled. An optimized model yielded a prediction model of 2.18 μs. The model was used to study qualitative mechanisms regarding parameter effects on the lifetime. A refractive index model was also utilized to explore relationships between the life time and [Si-H]/[N-H]. An increase in lifetime with decreasing pressure was attributed to an enhanced [N-H] and became much pronounced at lower hydrogen content. The longer lifetime at either higher SiH4 flow rate or lower N2 flow rate was attributed mainly to enhanced [Si-H] or [N-H], respectively. Silicon-nitride films were deposited by using a plasma-enhanced chemical vapor deposition (PECVD) system. For a systematic modeling, the PECVD process was characterized by means of a statistical experiment. Using a neural network, an effective lifetime was modeled. An optimized model yielded a prediction model of 2.18 μs. The model was used to study qualitative mechanisms regarding parameter effects on the lifetime. A refractive index model was also utilized to explore relationships between the life time and [Si-H]/[N-H]. An increase in lifetime with decreasing pressure was attributed to an enhanced [N-H] and became much pronounced at lower hydrogen content. The longer lifetime at either higher SiH4 flow rate or lower N2 flow rate was attributed mainly to enhanced [Si-H] or [N-H], respectively.

신경손상에 따른 만성통증과 관련된 뇌섬엽피질에서의 mTOR 신호전달 과정의 역할

권민지,한정수,차명훈,김은정,단위오까모토마사,이배환 한국감성과학회 2016 춘계학술대회 Vol.2016 No.-

Design of surface nanowire arrays for high efficiency thin (≤10 μm) Si solar cells

권민지,조윤애,김동욱 한국물리학회 2015 Current Applied Physics Vol.15 No.1

We investigated the optical characteristics and expected photocurrent of 10-μm-thick Si solar cells with surface nanowire arrays. The diameter and filling ratio of the array influenced not only the optical absorption, but also the spatial distribution of the optical generation rate. Proper design of the nanowire array could locate the high optical field region far from the surface, avoiding serious carrier collection loss and raising the energy conversion efficiency.

신경망과 CUSUM 제어차트를 이용한 플라즈마 색 감시

권민지,김병환 한국표면공학회 2009 한국표면공학회 학술발표회 초록집 Vol.2009 No.10

공정의 질 (Quality)과 장비생산성을 향상시키기 위해서는 플라즈마를 엄격히 감시해야 하며, 본 연구에서는 플라즈마 색 정보와 신경망을 결합한 감시 기법을 보고한다. 본 기법은 인-시추 색 정보 수집, 시계열 신경망 모델링, 그리고 CUSUM 제어로 구성된다. 제안한 기법을 소스전력을 변화시켜 발생한 색 정보에 적용하였으며 , 신경망 모델은 비정상 플라즈마를 정확하게 탐지할 수 있음을 확인하였다

최소가공된 절단 마늘의 환경기체조절포장

권민지,신용재,이동선,안덕순 한국포장학회 2011 한국포장학회지 Vol.17 No.1

반가공 상태의 절단마늘의 저장성을 향상시키는 적정 포장 조건을 찾기 위하여 기체 투과도가 다른 필름으로 밀착 포장하고 저장 중 품질을 비교하였다. 박피 후 2등분 절단 한 마늘을 400 g 단위로 통기성 포장(대조구), 30 μm 저밀 도 폴리에틸렌(LDPE), 50 μm 폴리올레핀 PD 900, 20 μm 폴리올레핀 PD 941 필름으로 밀착포장하고 1 ± 1oC에서 52일 동안 저장하면서 포장 내 기체조성과 함께 마늘의 중 량감소, 표면색도, 경도, 가용성 고형분 함량, 부패율을 측 정하였다. 외기의 공기 조성인 통기성 포장을 제외한 밀봉 필름 포장에서는 저장 45일 후에 대체적으로 O2 농도는 1~ 5%로, CO2 농도는 12~21%로 형성되었다. 통기성 포장에 서는 저장 45일째에 높은 곰팡이 부패 발생과 함께 급격한 중량감소가 나타났고 색택 변화도 심하였다. 모든 포장에서 저장 중, 경도는 감소하고 가용성 고형분 함량은 큰 변화가 없었다. 낮은 기체투과도로 인하여 포장 내에 낮은 O2 농도 와 높은 CO2 농도를 보였던 PD 900 포장에서 짓무름 현 상과 곰팡이 성장이 없이 52일 동안 저장될 수 있어서 가 장 우수한 저장성을 나타내었다. There is a need in food industry to store minimally processed garlic for long time to have it be used just at the time of demand for final product processing. Optimal modified atmosphere packaging is expected to slow down the quality change extending its storage life. In order to find optimal packaging conditions, plastic films of different gas permeability properties (low density polyethylene (LDPE) 30 μm, polyolefin 50 μm (PD 900), polyolefin 20 μm (PD 941)) were used for packaging 400 g of minimally processed garlic. Perforated LDPE packages were prepared as control. The packaged products were stored at 1 ± 1oC for 52 days. Package treatments were compared in weight loss, decay, surface color, hardness and soluble solid content. While control package had normal atmosphere of air, LDPE, PD 900 and PD 941 packages attained internal concentration of O2 4.6% / CO2 12%, O2 0.9% / CO2 21% and O2 0.5% / CO2 13% after 45 days, respectively. Control packaging had rapid weight loss with high mold decay and great surface color change in 45 days. In PD 900 film packages of lowest gas permeability, the fresh-cut garlic could be stored without mold decay for 52 days. Except control packaging, there were no significant differences in surface color, hardness and soluble solid content among package treatments.

Doping-level Dependences of Switching Speeds and the Retention Characteristics of Resistive Switching Pt/SrTiO3 Junctions

권민지,이은송이,Ahrum Sohn,El Mostafa Bourim,김동욱 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.6

We investigated the resistive switching behaviors of metal/oxide junctions consisting of Pt electrodes and Nb-doped SrTiO3(001) single crystals. The doping level affected the resistive switching ratio and the transport mechanism (thermionic emission for low doping and thermionic field emission for high doping). Pulse-mode switching experiments showed that an increase in the interface electric field by several times could enhance the switching speed by hundreds of times. The dependence of the retention time on the doping ratio was also examined. All the results suggested that ionic migration and carrier trapping could explain the resistive switching characteristics.

Chromosomal Analysis of Lilium longiflorum x Asiatic Hybrids Using GISH (Genomic in situ Hybridization)

권민지,임기병,Fahad Ramzan,안윤재,황윤정,강윤임,김창길,Adnan Younis 한국원예학회 2017 Horticulture, Environment, and Biotechnology Vol.58 No.6

In Lilium, a popular horticulture crop, the main objective of crossbreeding is introgression of desirablegenes and features into new cultivars. Commercial Lilium cultivars were produced primarily through 2n-gametes or2x-gametes as parental plants or backcrossing. The primary genetic difference in 2 methods, is the presence of genomicrecombination. Especially, GISH (genomic in situ hybridization) among molecular cytogenetic analysis, is the relevanttechnique to detect genetic information; genome composition, chromosome behavior during meiosis and recombinationof hybrids as using their parental DNA as a probe. Based on previous studies, in this research, 12 LA (L. longiflorumx L. Asiatic hybrids) hybrids were analyzed by GISH (genomic in situ hybridization) along with ploidy analysis, andpollen germination tests. The LA hybrids used in this study, showed less pollen germination ability (ranged 0 -21.74%), but germination of ‘Caesars Palace’ was significantly higher (59.09%). Interestingly, ploidy analysis showedthat ‘Caesars Palace’ was tetraploid and ‘Batistero’ had one more additional chromosome from the L genome. Nineof the 12 cultivars exhibited recombination and 3 had only non-recombinant chromosomes; fewer L. longiflorumchromosomes were present in the cultivars than Asiatic chromosomes. Consequentially, it is assumed that 2n-gameteswere more common methodology than 2x-gametes for producing commercial cultivars. Moreover, backcrossing tendedto be performed with the Asiatic hybrid cultivar.

Proximity proteolysis reaction as a universal platform for biomarker detection method

권민지,유태현,박현지 한국공업화학회 2023 한국공업화학회 연구논문 초록집 Vol.2023 No.0

음식물류 폐기물 처리장 부산물의 활성화 공정을 통해 제조된 친환경 활성탄의 탁도 및 색도 제거능력에 관한 연구

권민지,이승철,이준희,정진희,문종익,최영익 한국폐기물자원순환학회 2015 한국폐기물자원순환학회 학술대회 Vol.2015 No.05

본 연구는 음식물류 폐기물 처리장에서 발생하는 부산물의 활성화 공정을 통해 제조된 친환경 활성탄의 공업분석, 요오드 흡착 성능, 메틸렌블루 등의 특성을 평가하고, 그로 인한 탁도 및 색도 제거능력을 연구하여 활성탄의 대체물질로서의 재활용 가능성을 평가하고자 한다. 실험에 사용된 실험재료는 B시 F사의 음식물류 폐기물 처리시설에서 발생하는 음식물류 폐기물 처리장 부산물을 함수율 10% 미만으로 건조한 후, 분쇄기로 100 mesh 이하로 하여 사용하였다. 연구에 사용한 실험 장치는 최고온도 1,200℃까지 유지 가능한 고온전기로를 사용하였고, 600℃ 90분의 친환경 활성탄 시료의 요오드 흡착 성능이 가장 높게 나타났으며, 한국 활성탄소공업협동조합 수처리용 분말활성탄 기준인 950mg/g 이상의 기준과 비교하였을 경우는 600℃ 90분의 975.11mg/g 및 700℃ 60분의 950.92mg/g이 기준에 만족하는 것으로 나타났다. 메틸렌블루 탈색력 역시, 요오드 흡착성능 분석과 마찬가지로 600℃ 90분의 친환경 활성탄 시료의 메틸렌블루 탈색력이 가장 뛰어나게 나타났다. 또한 대부분의 활성화 온도에서의 메틸렌블루 탈색력이 요오드 흡착 성능과 비슷한 양상을 나타냄을 알 수 있었다. 이와 같이, 본 연구에서는 음식물류 폐기물 처리장 부산물을 이용하여 제조된 친환경 활성탄의 활성탄 대체물질로서 재활용이 충분히 가능할 것으로 판단했다.

위쳇(Wechat)을 활용한 한국어 말하기 발표 지도 사례 연구 —발음과 억양 피드백을 중심으로—

권민지 한글학회 2023 한글 Vol.- No.339

In this paper, pronunciation and intonation were personally fed back using WeChat to Chinese beginner learners in order to escape from simple imitation and limited classroom classes. Feedback was conducted using utterance voice, mouth-shaped video, and Praat in total. And the process, method, and case were presented in detail and the learner's response was surveyed. As a result, the learners answered that they were very satisfied with the class conducted in this paper and felt that their pronunciation and intonation skills improved. This paper does not conduct face-to-face and non-face-to-face feedback comparison and pre-post evaluation, so there is a limit to generalization due to a lack of objective evidence. Therefore, in the future, more reliable research will prove the results statistically. This paper is expected to be highly utilized in the educational field in that it specifically presented the actual Korean language class process and learner response.