Effect of Storage Conditions on the Setting Properties of Brushite Bone Cement Containing Granular β-Tricalcium Phosphate

이선애,정태주,오경식 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.10

In the bone cement composed of dense granules of β-Ca3(PO4)2 (β-TCP) and Ca(H2PO4)2H2O, the compressive strength, setting time and temperature rise were measured to observe the degradation of cement with respect to the stored days before setting. Decreases of compressive strength and temperature rise were observed, while setting time increased with respect to the stored days. The similar trends were repeated with the increase of temperature of storage. Such a change virtually meant the fading of the character of cement and it took place only when the two starting materials were mixed during storage. The degradation could be mitigated taking advantage of granular β-TCP instead of powdery one. The formation of CaHPO4, which resulted from reaction with ambient humidity, was attributed to the degradation observed during storage. Dependence of the degradation behavior on mixing and temperature during storage was discussed in terms of the driving force for reaction of cement In the bone cement composed of dense granules of β-Ca3(PO4)2 (β-TCP) and Ca(H2PO4)2H2O, the compressive strength, setting time and temperature rise were measured to observe the degradation of cement with respect to the stored days before setting. Decreases of compressive strength and temperature rise were observed, while setting time increased with respect to the stored days. The similar trends were repeated with the increase of temperature of storage. Such a change virtually meant the fading of the character of cement and it took place only when the two starting materials were mixed during storage. The degradation could be mitigated taking advantage of granular β-TCP instead of powdery one. The formation of CaHPO4, which resulted from reaction with ambient humidity, was attributed to the degradation observed during storage. Dependence of the degradation behavior on mixing and temperature during storage was discussed in terms of the driving force for reaction of cement

淸 初期 外藩(tulergi golo) 형성과정과 理藩院

이선애 동양사학회 2015 동양사학회 학술대회 발표논문집 Vol.2015 No.1

IPO vs. Back-door-listing : Which is a Better Signal?

이선애 대한경영학회 2013 大韓經營學會誌 Vol.26 No.8

How a firm goes public and trades its stock in the market is an important issue in corporate finance. Although numerous prior studies investigate the initial public offering (IPO), not many studies paid attention to back-door-listing(BDL). In a signaling game model, both IPO and BDL are the actions that a firm can take for going public. Investors do not know the quality of the firm (a good or a bad type) and can only observe its action (IPO or BDL) as a message. Under this information asymmetry, we find equilibrium strategy of the firm. Interestingly, the results show that as the type revelation ability of BDL strengthens, both a good type and a bad type firm are likely to take the BDL strategy in equilibrium. It means that BDLs with proper systematic complements help good unlisted firms access the external capital market. This paper provides a theoretical basis for the positive aspect of BDL.

『청사고(淸史稿)』「식화지(食貨志)」 역주(譯註) 1

이선애 중국사학회 2008 中國史硏究 Vol.52 No.-

유아교사의 DAP 교육신념과 DAP 교육실제간의 관련성 연구

이선애,이선미 미래유아교육학회 2006 미래유아교육학회지 Vol.13 No.2

부산 신항만지역의 환경친화적 에너지 수급계획 : 신항만지역의 표준기상데이터 작성 A Study on the Standard Weather Data for Busan Newport Area

이선애,김용경,이정재,조용수,도근영 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1

Reclamation area has a characteristic nature surroundings than a town-region or a inland area. It has a adverse conditions; low temperature, gale, much sunshine, moistured salt; at climate than inland area. In case propelling development with examining enough topography and climate characteristics of Water Front, climatic environment would grow worth. And it would lead to a rise of energy and maintenance expenses by calculating inaccurate capacity of installed equipments and by occurrence of defects of equipments. On this study, final object is selecting a friendly environment facility system and establishing a accurate energy supply and demand program in grasp of climate characteristic on reclaiming and developing in Busan Newport Area. So we drew up it based on AWS(Automatic Weather System) measure data and standard climate data in Busan Newport Area.

현대도예가 김석환의 삶과 작품세계 연구

이선애,임헌자 한국도자학회 2020 한국도자학연구 Vol.17 No.1

There have been many changes and achievements in the short period of time until the formation of modern Korean ceramic art. Considering the beginning of modern ceramic art in Korea from the mid-1950s to the 1960s, the establishment of the Ministry of Crafts and Crafts in Korea and the formal and active pottery education at the university can be said to be a full-fledged departure. In 1958, the Korean Craft Demonstration Center was established with the support of the US CIA, and this demonstration site was used as a training place for students at Seoul National University and Hongik University. Became. At this time, Seok-Hwan Kim, a student at Hongik University, was Mrs. Seok-Hwan Kim, who is covered in this study, is the first generation of modern ceramic art and has produced a lot of disciples through his pottery education throughout his life, and has made many achievements with his vigorous work activities and ceramic works. The potter's pottery, which began in the late 1950s, was the first in the ceramics division to win a national exhibition, and then, during the education of post-secondary education, he had an active solo exhibition. The teacher's work expresses abstract and modern patterns with traditional elements in the early stages, and then shows the trend of large-scale work using a wheel.also trained by Stanley Fistic of the Korean Craft Demonstration Center. To establish itself as. It is the most Korean, traditional, and interested in Onggi, which naturally expresses the physical properties of the soil. The huge work with the motif of Onggi is a work designed with a modern sense by sublimating traditional elements and techniques such as oil-free and salt oil. These works are stored in the 'Dol Seok Ceramics Museum', which the teacher spent at the expense of his life and prepared at the foot of Surisan. The museum can also be said to be a valuable work in which the works of the teacher's life are concentrated. 지금의 한국 현대도예가 형성되기까지 짧은 기간 동안 많은 변화와 성과가 있었다. 우리나라 현대도예의 시작을 1950년대 중반 이후부터 1960년대로 간주할 때, 국전 공예부의 창설과 함께 대학에서 정식으로 활발하게 이뤄진 도예교육을 본격적인 출발이라 할 수 있다. 1958년에는 미국 CIA의 지원으로 한국공예시범소 가 설립되었고 이 시범소는 서울대와 홍익대 학생들의 실습장소로 활용되며 이전까지 일본의 영향을 받던 우리나라 도자문화가 미국도예의 영향을 받게 되는 결정적인 계기가 되었다. 이때 홍익대에 재학하던 김석환 선생도 한국공예시범소의 스탠리 피스틱(Stanley Fistic)의 교육을 받았으며 이처럼 대학교육과 해외유학을 통해 교육을 받은 작가들이 한국 현대도예를 태동하고 형성해 가는 우리나라 현대도예의 1세대로 자리매김하게 된다. 본 연구에서 다루고 있는 김석환 선생은 현대도예의 1세대로서 평생을 도예교육을 통해 많은 제자를 배출하였고, 왕성한 작품활동과 도예작품으로 많은 업적을 남겼다. 1950년대 후반부터 시작된 선생의 도예는 도자부문에서는 처음으로 국전에서 입선을 하고 이어서 후학을 교육하는 와중에도 활발한 개인전을 갖게된다. 선생의 작업은 초기에 추상적이고 현대적인 문양을 전통적인 요소와 응용하여 표현하였고 이후 물레를 이용한 대형화된 작품경향을 보인다. 가장 한국적이고 전통적이며 흙의 물성이 자연스럽게 표현된 옹기에도 관심이 많아 많은 수집은 물론이거니와 작품의 곳곳에 표현되어 있는 것을 볼 수 있다. 옹기를 모티브로 한 거대한 작업은 무유소성과 소금유 등 전통적인 요소와 기법을 승화시켜 현대적 감각으로 디자인된 작품이라 할 수 있다. 이러한 작품들은 선생이 생전에 사비를 들여서 수리산 자락에 마련한 ‘돌석도예박물관’에 소장되어 있다. 박물관 역시 선생의 생애의 작업들이 집약된 귀중한 유작이라 할 수 있다.

유아 다문화 이해교육 인식척도 개발

이선애 한국아동학회 2008 한국아동학회 학술발표논문집 Vol.2008 No.12

과립형 β-삼인산칼슘을 사용한 Brushite계 골시멘트의 보관 조건에 따른 경화 특성

이선애,정태주,오경식,Lee, Sun-Ae,Chung, Tai-Joo,Oh, Kyung-Sik 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.10

In the bone cement composed of dense granules of $\beta-Ca_3(PO_4){_2}(\beta-TCP)$ and $Ca(H_2PO_4){_2}H_2O$, the compressive strength, setting time and temperature rise were measured to observe the degradation of cement with respect to the stored days before setting. Decreases of compressive strength and temperature rise were observed, while setting time increased with respect to the stored days. The similar trends were repeated with the increase of temperature of storage. Such a change virtually meant the fading of the character of cement and it took place only when the two starting materials were mixed during storage. The degradation could be mitigated taking advantage of granular $\beta$-TCP instead of powdery one. The formation of $CaHPO_4$, which resulted from reaction with ambient humidity, was attributed to the degradation observed during storage. Dependence of the degradation behavior on mixing and temperature during storage was discussed in terms of the driving force for reaction of cement.

저소득가정과 영아보육지원정책에 대한 고찰

이선애 한국영유아보육학회 2005 한국영유아보육학 Vol.0 No.41

This study focuses on the analysis of child care policy which supports low income families and infant caring families. The mediate child care services for poor families are essential, as their children are exposed to enormous environmental dangers. The present government policy puts more emphasis on expanding fee-free caring for five-year-old child than on supporting poor families. As a result, complementary child care policy of 'Choice and Concentration' is actively required to aid low income families. Baby care policy should be expanded for the families with working problems caused by delivery and nursing. It is necessary to retouch existing private child care facilities institutionally to accept more infants than now. Also home visiting family care system which government is planning to adopt can be a supplementation of the present system. 본 연구는 보육정책이 저소득가정지원이라는 정책적 목적 달성을 어느 정도 달성하였는가를 살펴보고자 하며 앞으로 사회적 양육으로 보다 확대하기 위한 사전단계로 무엇이 우선 충족되어야 하는 것을 밝히고자 하였다. 연구의 결과 보육정책은 저소득가정지원수준이 미흡하며 근로여성은 여전히 육아의 어려움으로 인해 취업에 어려움을 경험하고 있다고 본다. 욕구정도가 높은 저소득가정보육에 대한 포괄적 지원정책이 요구되며 또한 영아보육을 위한 시설확충과 보육수당이 요구되며, 본 연구의 결과는 보육정책의 실효성 확보를 위한 기초 자료로서 제공될 수 있을 것이다.