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In situ 고상 에피택시 방법에 의한 CoSi₂/Si(111)구조의 형성
이정주,강민성,김현수,최치규,이운환,이종덕,이영백,김건호,이정용 濟州大學校 基礎科學硏究所 1996 基礎科學硏究 Vol.9 No.2
초고진공에서 공상에피택시(solid-phase epiyaxy, SPE) 방법으로 CoSi₂를 Si(111)기판 위에 에피택시 성장시켰다. 2MeV⁴He++ ion후방산란 분광기와 사중결정 x-선 회절기 및 고분해 투과전자 현미경을 이용하여 성장된 CoSi₂의 상과 조성, 결정성, 그리고 계면의 미시구조를 조사하였다. 초고진공상태의 실온에서 Si(111)-7X7기판에 Co를 약 20 ~50 ?? 중착한 후 SPE에 의하여 실리사이드를 형성시키는 경우 600℃에서는 B-형의 CoSi₂가, 그리고 700℃에서는 A형의 CoSi₂가 선택적으로 에피택시 성장하였으며, 정합성은 B-CoSi₂[110]//Si[110] and CoSi₂(111)//Si(111)이, 그리고 700℃에서는 A-CoSi₂[110]//Si[110], CoSi₂(002)//Si(002)을 나타내었다. Epitaxial films of CoSi₂were grown on Si(111) substrates by in situ solid-phase epitaxy in a ultrahigh vacuum. The phase, the chemical composition, the crystallinity, and the microstructure of the Silicide/Si interface were investigated by 2-MeV⁴He++ ion-backscattering spectrometry, quadruple crystal X-ray diffractometry, and high-resolution transmission eletron micorscopy. High-quality films of either B-type or A-type CoSi₂ could be grown selectively on Si(111) substrates by depositing ~ 20 ~ 50 ?? of Co on a Si(111)-7X7 substrate followed by in situ annealing at 600℃ or 700℃ for 10 min. The matching face relationships are CoSi₂[110]//Si[110] and CoSi₂(111)//Si(111) by B-type CoSi₂ and CoSi₂[110]//Si[110]//Si[110] and CoSi₂(002)//Si(002) for A-type CoSi₂.
박이동,이관종,장영근 成均館大學校 科學技術硏究所 1995 論文集 Vol.46 No.2
This study is to obtain optimized design parameters of waste heat boiler with fire and smoke tube which are widely used to provide process and building heat. The optimum parameters obtained in this study can be used as a guideline for actual. boiler design of this type. The design optimization considered here is to find the most economical dimensions of the boiler considered which results in a minimum cost in producing a unit amount of steam per given period of operation. For this purpose, the first we have to determine what are the main parameters of affecting the total cost of producing a unit amount of steam which is comprised of manufacturing cost of the boiler, operating cost of the fan, etc. For the selected design parameters, we will have to decide the conditions of each parameter which will result in the minimum total cost. For the waste heat boiler with fire and smoke tube under consideration, the major parameters of affecting the total cost are considered to the diameter of the smoke tube and the gas velocity among others. The two parameters selected here are considered for finding the optimum size of the boiler by minimizing the total cost which is a function of the manufacturing cost, purchasing cost of the fan, and the operation cost of the system. Through computer simulation, the optimum conditions of these two parameters are obtained for different boiler capacities and different periods of operation.
Polyol공정에 대한 위험성 평가에 의한 안전비용 산정에 관한 연구
이준석,이영순,박영구 한국산업안전학회 2002 한국안전학회지 Vol.17 No.1
A research on accident loss calculation for polyol process without safety management activities, and safety cost estimation using process risk assessment has been implemented. In order to estimate a magnitude of loss, accident scenarios were made by combining result made from HAZOP Study method with accident possibility analysis results implemented with FTA. Also effect assessment was implemented for accident consequence of each scenario. And minimum possible loss cost has been calculated when safety investment do or not. Result from cost-benefit analysis was shown as approximately ₩335 billion(=US$44,000 billion), as cost after subtracting safety management cost from minimum possible loss cost.
리튬 이온 이차전지를 위한 부극용 Si 특성에 관한 연구
김성호,이상헌,박일현,김민철,우태욱,손영국 부산대학교 생산기술연구소 2000 生産技術硏究所論文集 Vol.59 No.-
리튬이온이차전지의 부극으로 Si를 사용하였다. 부극용 Si전극을 1회 충방전 시 Li이온이 탈 삽입될 때 각각의 전압에서 XRD 회절분석을 통하여 Li이온이 이동하여 Si와 반응하는 것을 조사하였다. 순환전압전류 및 충방전 시험을 통하여 전기 화학적 특성을 측정해본 결과 부극으로써 Si의 산화환원 반응이 양호하게 이루어졌으며 충방전에 대한 cycle number가 증가할수록 비가역적인 산화환원반응 및 부피변화로 인해 싸이클 특성 감소함을 나타내었다. Si with anode is used Li ion secondary batteries During Li ion intercalating at first cycle, XRD analysis studies at others voltages showed that Li ions are moved and reacted to Si The electrochemical properties of Si anode materials were evaluated by cyclic voltammetry and charge/discharge test. With cycle number increasing, cyclic characteristics are decreased for irreversible reduction/oxidation and volume change.
딥러닝과 영상처리 기법을 사용한 통합 지능형 주차 관제 시스템 개발
이영지(Young-Ji Lee),이희열(Hee-Yeol Lee),고태영(Tae-Young Ko),곽동훈(Dong-Hoon Kwak),김재형(Jae-Hyung Kim),김주호(Joo-Ho Kim),오승진(Seung-Jin Oh),이승호(Seung-Ho Lee) 대한전자공학회 2019 대한전자공학회 학술대회 Vol.2019 No.11
In this paper, we propose the development of an integrated intelligent parking control system using a 360° camera that has overcome the shortcomings of the existing parking control system. The system proposed in this paper consists of six items as follows. First, license plate recognition software when entering the vehicle, second, real-time parking space identification software using 360° image, third, real-time precision parking guidance software based on deep learning vehicle motion recognition, fourth, multi-license-plate recognition software using 360° image, fifth, real-time parking position identification software using 360° image, sixth, database server etc. Performance evaluation results were high in both recognition rate and time spent, and efficiency was confirmed.
Lee, Jung-Woo,Cha, Jeong-Ho,Shin, Sun-Hee,Kim, Yun-Jeong,Lee, Seul-Ki,Cha, Hye-Jin,Kim, Ji-Hae,Ahn, Ji-Hyun,Kim, Hye-Young,Pak, Kyung-Ah,Yoon, Ji-Sung,Park, Seo-Young,Park, Choon-keun The Korean Society of Developmental Biology 2016 발생과 생식 Vol.20 No.3
Most of the commercial devices for vitrification are directly immersed into the warming solution (WS) for increasing of warming rate. However, the previous modified cut standard straw (MCS) which has reported is difficult to immerse into the WS. The aim of this study was to investigate whether the long cut straw (LCS) could be useful as a stable tool for vitrified-warmed human blastocysts. A total of 138 vitrified-warmed cycles were performed between November 2013 and November 2014 (exclusion criteria: women ${\geq}38$ years old, poor responder, surgical retrieval sperm, and severe male factor). The artificial shrinkage was conducted using 29-gauge needles. Ethylene glycol and dimethyl sulfoxide (7.5% and 15% (v/v)) were used as cryoprotectants. Freezing and warming were conducted using the LCS tool. The cap of LCS was removed using the forceps in the liquid nitrogen ($LN_2$) and then directly immersed into the first WS for 1 min at $37^{\circ}C$ (1 M sucrose). Only re-expanded blastocysts were transferred after it was cultured in sequential media for 18-20 h. A total of 294 blastocysts were warmed, and all were recovered (100%). Two hundred eighty-five embryos were survived (96.9%). The vitrified-warmed blastocysts of all patients were transferred without any cancellation. We were able to achieve a reasonable implantation (24.2%), following by clinical pregnancy (36.2%), which then continued to ongoing pregnancy (36.2%), and live birth (31.2%). Using LCS is achieved the acceptable rates of survival, pregnancy and live birth. Therefore, the LCS could be considered as a stable and simple tool for human embryo vitrificaton.