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.

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.

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.

공공데이터 유사도 측정을 위한 의미 기반 매칭 기법

권민지,김준철 한국경영과학회 2022 한국경영과학회 학술대회논문집 Vol.2022 No.6

Proximity proteolysis reaction as a universal platform for biomarker detection method

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

가상현실-간호교육의 미래

권민지 한국감성과학회 2022 춘계학술대회 Vol.2022 No.-

의료 보건인, 특히 간호사는 국민의 건강관리를 담당하는 주요 구성원으로서 생명과 건강을 다루는 직업이다. 따라서 간호교육의 목적은 병원을 포함한 다양한 임상 실무에서 요구되는 이론과 기술을 익혀 능숙하게 수행하는 전문가를 양성함에 있으며 이에 간호대학생들에게 있어 간호수행능력은 가장 중요한 요인으로 간주된다. 학생들은 교내실습과 교외실습을 통하여 간호대상자의 간호문제를 해결하기 위한 기본적인 실무 능력부터 효율적인 의사소통까지 다양한 내용을 학습하게 된다. 간호술의 대부분은 사람을 대상으로 수행하는 것이지만 간호대상자의 권리의식 향상 및 종합병원의 고객 중심 서비스 지향 등으로 간호대학생의 직접 간호의 경험은 점점 줄어들고 있다. 더욱이 지난 2년 간 COVID-19의 전 세계적인 대유행(pandemic)으로 인하여 다수의 의료기관들이 간호대학생의 실습을 제한하였으며, 대면 실습교육의 한계에 직면하게 되었다. 이에 비대면으로도 임상기관에서의 실습교육 효과를 보장할 수 있는 실습교육 프로그램 개발이 절실하였고, 대안으로 제기되는 것이 가상현실(virtual reality, VR)을 적용한 시뮬레이션 교육이다. 기술의 발전은 일상생활을 비롯한 다양한 영역에 많은 변화를 가져왔고, 그 중 증강현실, 가상현실 등은 가장 크게 변화된 영역 중 하나로서 4차 산업혁명에 도래한 현재 중요한 기술로 인지되고 있다. 이러한 진보된 기술에 교수자의 접근성이 향상됨에 따라 다양한 형태의 간호 교육 프로그램이 개발되고 있다. 이에 본 연구에서는 실제 임상 현장을 대리 경험할 수 있는 VR 형태의 실습 환경 구축과, 이를 활용한 시뮬레이션 수업 등을 통해 비대면 방식의 가상현실을 통한 교육 매체의 효과성에 대해 알아보고자 한다.

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.

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.

효용이론 기반 숙고형 행동트리를 이용한 게임 인공지능 에이전트

권민지,서진석 한국멀티미디어학회 2022 멀티미디어학회논문지 Vol.25 No.2

This paper introduces deliberative behavior tree using utility theory. The proposed approach combine the strengths of behavior trees and utility theory to implement complex behavior of AI agents in an easier and more concise way. To achieve this goal, we devised and implemented three types of additional behavior tree nodes, which evaluate utility values of its own node or its subtree while traversing and selecting its child nodes based on the evaluated values. In order to validate our approach, we implemented a sample scenario using conventional behavior tree and our proposed deliberative tree respectively. And then we compared and analyzed the simulation results.

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