균일침전법에 의한 Yttrium Iron Garnet 분말의 합성 및 열분해특성

안영수,한문희,김종오,An, Yeong-Su,Han, Mun-Hui,Kim, Jong-O 한국재료학회 1996 한국재료학회지 Vol.6 No.3

YIG 전구체 분말은 요소의 열분해반응을 이용한 균일침전법에 의해서 질산염으로부터 제조하였다. 침전은 철이온이 먼저 침전한 후 이트륨이온이 침전하는 과정으로 이루어졌다. YGI전구체 분말은 철산화물과 비정질로 구성되어 있으며 그 분말의 대략적인 화학식은 2.5Fe2O3.Y3(OH)9-2x(CO3)x.nH2O로 되어있다. YIG 전구체 분말의 열분해과정은 dehydration, 철산화물의 recrystallization, yttrium carbonate 및 yttrium oxide의 형성과 고상반응등 여러단계로 구성되어 있다. 열처리온도가 증가함에 따라 Y2O3와 Fe2O3의 고상반응에 의해 YFeO3 intermediate을 경유해서 YIG상이 형성됨을 확인하였다. 단일상의 YIG는 120$0^{\circ}C$에서 6시간 공기중에서 소성함에 의해서 얻을 수 있었다.

주요국의 항공우주산업 RandD 현황과 시사점

안영수,An, Yeong-Su 한국항공우주산업진흥협회 2001 航空宇宙 Vol.75 No.-

기관지 천식환자의 기관지 폐포세척액내의 CD5 림프구

안영수,정일권,어수택,이상무,김현태,정연태,김용훈,박춘식 대한천식알레르기학회 1992 추계학술대회 초록집 Vol.1992 No.-

교통약자의 역세권 이동범위 실증 연구

안영수,고주연,이승일 한국도시부동산학회(구 도시정책학회) 2018 도시정책학회 학술대회 Vol.2018 No.11

In the daily life of the transportation vulnerable, the accessibility to the facilities such as the hospital or welfare to the destination is possible using passenger cars or semi-public transportation like a disabled taxi, etc. However, for leisure purposes, such as shopping and meetings, transportation is mainly based on public transportation, in particular, while the movement inside the station is relatively easy on the case of urban railways, after moving out of station, moving conditions are very poor in station area. Therefore, in order to improve the daily life for transportation vulnerable, in addition to the facilities inside the public transportation, the conditions of transportation in the station area are also important, and a model that can be verified and evaluated spatially is needed. This study is to empirical analysis the movement range in the urban railway station area to promote the daily life for the transportation vulnerable. A distance, area, and facilities that can be moved for a certain period of time are calculated to distinguish vulnerable areas based on the GIS walking network from the station to the subway station of the city railway which is the representative public transportation of Seoul city. We develop a model that can quantitatively analyze the effect of improvement of pedestrian facilities for transportation vulnerable.

수도권 시군구별 입지요인이 제조업 기업의 생애주기에 미치는 영향 연구

안영수,이승일 한국지역학회 2015 지역연구 Vol.31 No.3

The purpose of this research is to analyze the influence of the regional location factors to the lifecycle of manufacturing firms in the Seoul Metropolitan Area. A firm has a lifecycle in common like a household. The firm’s lifecycle is divided into 4 sections such as formation, dissolution, growth and decline for the manufacturing firms as light industry, heavy industry and high-tech industry. In addition, the regional location factors are divided into 4 categories. As a result of this research, there are differences for the statistically significant location factors. In addition, the value for the explanation ability of each multiple linear regression model (adj.R-square) was high in the formation and growth sections than in dissolution and decline sections. It means that the local governments need differentiated policies considering their regional characteristics for the location factors by firm’s lifecycle when they established policies for industry or job. From the view point of the public sectors, it is much important to focus on formation and growth of firms. 이 연구의 목적은 수도권 시군구별 입지요인이 제조업 기업들의 생애주기에 미치는 영향을 실증분석 하는 것이다. 한 기업도 가구와 마찬가지로 일련의 생애주기를 갖는다. 기업의 생애주기를 선행연구에서는 기업통계(firmography)로 정의하고 있으며, 이를 생성, 성장, 쇠퇴, 소멸의 단계로 구분하였다. 이 연구에서도 기업의 생애주기 단계를 동일하게 적용하였으며, 제조업 기업들을 대상으로 경공업과 중공업, 첨단제조업으로 구분하여 분석하였다. 수도권 시군구별 입지요인은 도시규모와 교통접근성, 사회·경제특성, 수도권 권역구분으로 구분하여 총 12개의 입지요인을 독립변수로 적용하였다. 분석결과, 경공업과 중공업, 첨단제조업 기업별로 기업의 생애주기에 미치는 유의미한 입지요인이 차이가 있었으며, 입지계수 또한 각각 다르게 나타났다. 이 연구결과는 기업유치를 통해 일자리를 늘리려는 지자체에서 신규기업의 생성뿐만 아니라 기존 기업의 성장을 도모하는 정책을 수립하는데 있어서 중요한 기초자료가 될 수 있을 것으로 기대된다.

UR에 대비한 항공기산업의 발전 과제

안영수,An, Yeong-Su 한국항공우주산업진흥협회 1994 航空宇宙 Vol.21 No.-

Thomas Hardy의 시에 나타난 Irony

安榮洙 한국영어영문학회 1989 영어 영문학 Vol.35 No.3

High-k HfO2와 HfO2/Al2O3/HfO2 적층막의 구조 안정성 및 전하 트랩핑 특성 연구

안영수 ( Young Soo Ahn ),허민영 ( Min Young Huh ),강해윤 ( Hae Yoon Kang ),손현철 ( Hyun Chul Sohn ) 대한금속·재료학회 2010 대한금속·재료학회지 Vol.48 No.3

In this work, high-k dielectric stacks of HfO2 and HfO2/Al2O3/HfO2 (HAH) were deposited on SiO2/ Si substrates by atomic layer deposition as charge trapping layers in charge trapping devices. The structural stability and the charge trapping characteristics of such stacks were investigated using Metal-Alumina- Hafnia-Oxide-Silicon (MAHOS) structure. The surface roughness of HfO2 was stable up to 11 nm with the insertion of 0.2 nm thick Al2O3. The effect of the thickness of the HAH stack and the thickness of intermediate Al2O3 on charge trapping characteristics were investigated for MAHOS structure under various gate bias pulse with duration of 100 ms. The threshold voltage shift after programming and erase showed that the memory window was increased with increasing bias on gate. However, the programming window was independent of the thickness of HAH charge trapping layers. When the thickness of Al2O3 insertion increased from 0.2 nm to 1 nm, the erase window was decreased without change in the programming window.

EAF dust가 함유된 붕규산염계 결정화 유리의 미세구조 분석

안영수,강승구,김유택,이기강,김정환,Ahn, Y.S.,Kang, S.G.,Kim, Y.T.,Lee, G.K.,Kim, J.H. 한국결정성장학회 2006 韓國結晶成長學會誌 Vol.16 No.2

붕규산염계 유리 프리트에 중금속이 다량 함유된 전기로 EAF dust(전기로 제강분진, 이하 더스트)를 $10{\sim}80wt%$ 범위로 첨가한 후 용융하여 유리 시편을 얻었다. 제조된 유리의 DTA분석 결과로부터 유리전이온도, $T_g$가 $550^{\circ}C$ 부근임을 확인하였고 이로부터 결정화에 필요한 열처리 조건을 $700^{\circ}C$/10 hr으로 정하였다. 더스트 첨가량이 70wt% 이상인 유리시편은 XRD 분석 결과 spinel 결정 피크만이 나타났으며, 결정화 시편의 경우, 더스트 첨가량이 40wt% 이상부터 spinel 결정이, 80wt% 부터는 spinet과 willemite 피크가 함께 검출되었다. XRD 분석으로는 결정상이 검출되지 않았던 조성의 유리시편에서도 aspect ratio=$0.7{\sim}1.0$인 수십 nm 크기의 결정상 존재가 SEM으로 확인되었고 결정화 시편에서도 더스트 함량이 l0wt%부터 결정상이 관찰되었다. 결정화 시편에서 관찰된 결정상은 그 형태와 분포가 첨가량에 따라 다양하고 비균일 하였으나 더스트 첨가량이 70wt%인 시편에서는 aspect ratio가 1에 가까운 6면체 형상을 나타내었다. Glassy specimen was obtained by melting and quenching a borosilicate glass frit miked with $10{\sim}80wt%$ EAF dust. The glass transition temperature, $T_g$ of glassy specimen was measured around $550^{\circ}C$ from the DTA curve and the eat treatment condition to crystallize a glassy specimen was selected as $700^{\circ}C$/1 hr. The spinel crystal peaks were found in XRD analysis for the glass containing dust > 70 wt%. For the glass-ceramics, however, the spinel peaks in a specimen containing dust > 40 wt%, and the spinel and willemite peaks in dust > 80 wt%. The crystals of several tens of nanometer with aspect ratio of $0.7{\sim}1.0$ were observed at a glassy specimen containing dust > 40 wt% by SEM which was not found by XRD analysis. For the glass-ceramics, the crystals were found in a specimen containing dust of even 10 wt% by SEM. The feature and distribution of crystals observed through the specimen for a glass-ceramics were diverse and not uniform. The crystals found in the glass-ceramics containing 70 wt% dust were hexahedral with an aspect ratio of around unity.

Applying the tourist life cycle concept to the evolution of commercial areas using density, diversity, and land price

안영수,장윤정 한국관광연구학회 2020 관광연구저널 Vol.34 No.4

It is a globally recognized phenomenon that commercial areas serve as spaces of affluent, leisure consumption. Nonetheless, the topic of retail change remains poorly theorized. Views on commercial area changes are beginning to be challenged, however, with the acknowledgement that the fundamental importance of retail change is in instigating gentrification. From the perspective of the business life cycle, retail changes can affect the opening, closing, and duration of businesses. With the growth of tourism worldwide, commercial locations have the potential to transform, gentrify, and become urban attractions and tourist destinations. The tourist attraction life cycle model (TALC) may be applicable to commercial areas when they are thus conceptualized as tourist attractions. This study examined the applicability of a life cycle model—development, consolidation, stagnation, and decline—to the process of change of commercial areas to identify patterns. We attempted to define change in commercial areas in terms of business density, diversity, and changes in land prices using micro data from business enterprises in Seoul (1996-2016) from the Korean Chamber of Commerce and Industry. The results showed that there were four patterns of commercial area change in the portfolio analysis. Applying the TALC, we found that commercial areas passed through four life cycle stages in a manner that might be best explained using the complexity theory.