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- 저자 : 안성희(Sung Hee Ahn) (검색결과 61 건)
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EDTA, 염산 테트라싸이클린, 구연산 처치가 치근면에 미치는 영향
안성희,채중규,김종관,조규성,Ahn, Seong-Hee,Chai, Jung-Kiu,Kim, Chong-Kwan,Cho, Kyoo-Sung 대한치주과학회 1999 Journal of Periodontal & Implant Science Vol.29 No.3
The goal of periodontal therapy is the periodontal regeneration by the removal of microorganisms and their toxic products from the periodontally diseased root surface. To achieve periodontal regeneration, root conditioning as an adjunct to root planing has been done. There are low pH etchants such as citric acid, tetracycline-HCl, and EDTA solution which is a neutral chelating agent. The purpose of present study was to examine the effect of root conditioning by citric acid, tetracycline HCl, and EDTA. Total 35 root specimens(6${\times}$3${\times}$2mm) were prepared from the periodontally diseased teeth, scaled and root planed. The specimens were treated with normal saline for 1 minute, saturated citric acid(pH 1) for 3 minutes, 50mg/ml tetracycline-HCl(pH 2) for 5 minutes, 15% EDTA(pH 7) for 5 minutes using rubbing technique. The specimens were examined under scanning electron microscopy at 1000, and 3000 magnification. On the microphotographs taken at 1000 magnification, the numbers of opened and patent dentinal tubules per unit area(10,640${\mu}m^2$) were counted. And the diameters of opened dentinal tubules per unit are (10,640${\mu}m^2$) were measured. The differences of number and diameter among all groups were statistically analyzed by Kruskal Wallis Test. The results were as follows; 1. In the specimens applied with normal saline(control group), the root surface was finely cracked, and was covered by irregular smear layer. Neither exposed dentinal tubules nor any patent dentinal tubules could be seen. 2. In the specimens applied with saturated citric acid(experimental 1 group), the globular collagen fibers were exposed around the peritubular space, and many dentinal tubules were revealed. 3. In the specimens applied with tetracycline-HCl(experimental 2 group), the process-like collagen fibers were exposed around the peritubular space, and some dentinal tubules were revealed. 4. In the specimens applied with 15% EDTA(experimental 3 group), the root surface was covered by the collagenous fibrillar network, and many dentinal tubules were revealed. 5. The numbers of opened and patent dentinal tubules were significantly more in exp. 1 group and exp. 3 group than in exp. 2 group(P<0.05). But there was no significant difference between exp. 1 group and exp. 3 group. In control group, the number of opened and patent dentinal tubules could not be counted because any dentinal tubules couldn't be seen. 6 . The diameter of opened dentinal tubules was significantly smaller in exp. 1 group and exp. 3 group than in exp. 2 group(P<0.05). But there was no significant difference between exp. 1 group and exp. 3 group. In control group, the diameter of opened dentinal tubules could not be measured because any dentinal tubules couldn't be seen. The results demonstrate that root conditioning with citric acid, tetracycline- HCl, and EDTA is more effective in periodontal healing than only root planing, and 15% EDTA solution can replace low pH etching agents such as citric acid, tetracycline-HCl for root conditioning.
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안성희,이준기,하지은,Ahn, Sung-Hee,Lee, Zoonky,Ha, Ji-Eun 한국빅데이터학회 2017 한국빅데이터학회 학회지 Vol.2 No.1
재난 경제학 분야의 선행연구는 대부분 뒤늦은 거시지표 또는 특정 업종에 국한된 분석형태이다. 재난 예방이 무엇보다 중요하지만, 재난 발생 즉시 파급되는 실시간 영향도 분석 및 그에 따른 재건 정책 또한 예방 못지 않은 중요한 분야이다. 본 연구는 카드사의 실시간 빅데이터를 활용한 사건 연구로 세월호 참사와 메르스 사태로 인한 민간소비의 파급효과를 분석하였으며 Marketing Mix Modeling 방법론의 Idea를 활용하였다. 분석 결과 세월호 참사는 3개월에 걸쳐 민간소비가 위축된 반면 메르스 사태는 비슷한 규모로 1개월동안 일시적인 급격한 민간소비 감소현상을 보이고, 바로 회복하는 모습을 보였다. 본 연구의 초점은 재난이 종료되지 않은 시점에서 속보성으로 피해규모가 파악이 가능한지 알아보고자 한 것이며 분석모형을 주간 단위로 설계하여 시점을 이동하면서 분석했을 경우 속보성 지표로도 의미가 있다는 것을 확인하였다. 향후 재난 또는 사건 발생시 본 연구가 직관적인 모니터링 지표로서의 초석이 되길 기대한다. According to precedent research of disaster economics, most of the studies are either based on belated macroeconomic indicators or are limited to specific industries. It is certain that preventing disaster is important, but immediate analysis and reconstruction policy are crucial as well. This research analyzed the ripple effect of consumer spending followed by April 16 ferry disaster and MERS outbreak; it was done by applying credit card company's real-time big data with Marketing Mix Modeling. The main focus of this research is to see if it is possible to predict the scale of damage during ongoing disasters. It is found that setting up weekly MMM and moving the timeline draws significance conclusion. When disasters or events occur in future, this research may be the basis of building quick and intuitive indicator to monitor possible effects.
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안성희,유승철,조미영,김미란,황경주,유희석,Ahn, Sung-Hee,Yoo, Seung-Chul,Jo, Mi-Yeong,Kim, Mi-Ran,Hwang, Kyung-Joo,Ryu, Hee-Suk 대한생식의학회 2002 Clinical and Experimental Reproductive Medicine Vol.29 No.4
Objective: To evaluate the efficacy of sclerotherapy for conservative treatment of ovarian pseudocyst. Methods: Patients with ovarian pseudocyst who had undergone sclerotherapy at Ajou University Hospital from February, 1997 to March, 2002 were included in this study. Sclerotherapy was performed as follows: Under intravenous analgesia, the cyst was irrigated with dehydrated alcohol after aspiration under transvaginal sonography. The aspirated contents and alcohol irrigated contents were sent for cytologic examination. Results: 71 patients with ovarian pseudocyst were performed sclerotherapy. All but 2 patients were followed up for 0.5 to 33 months with transvaginal sonography and pelvic examination. Mean age of the patients was 40 years old. Mean size of the pseudocyst was 8.0 cm, mean amount of aspiration fluid was 179.8 ml, and average follow-up duration was 6.0 months. All had abdominal or pelvic surgical history and 38 patients (58.9%) of them had undergone hysterectomy. 44 of 71 patients (62.0%) were performed sclerotherapy only one time. 27 patients (38.0%) recurred and were undergone more than one time. Complication was not occurred in all cases. Conclusions: We concluded that although pseudocyst after sclerotherapy has high recurrence rate, sclerotherapy was an safe and effective method for conservative treatment of ovarian pseudocyst.
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안성희 ( Sung Hee Ahn ),황문호 ( Mun Ho Hwang ),김문철 ( Moon Chul Kim ) 한국회계학회 2015 회계학연구 Vol.40 No.1
선행연구에 따르면, 유상증자를 앞둔 경영자는 신주 발행가격을 높이려는 유인이 있으며 이를 위해 증자 전의 보고이익을 상향조정하는 것으로 보고된다. 하지만 이들 선행연구는 유상증자의 유형-주주배정, 일반공모, 제3자배정-에 따라 경영자의 경제적 유인이 다를 수 있음을 고려하지 않았으며, 또한 유상증자 발행가에 영향을 주기 위한 이익조정 시기를 적절히 설정하지 못한 한계점을 가지고 있다. 이에 본 연구는 유상증자 유형에 따라 신주발행가격이 기존주주의 부에 미치는 영향이 다르다는 점에 착안하여 유상증자 유형별로 경영자의 이익조정 행태가 달리 나타나는지를 분석한다. 또한 이익조정이 행해지는 기간을 보다 면밀히 포착하기 위하여 기존 국내연구와는 달리 분기자료를 이용한 실증분석을수행한다. 2004년부터 2009년까지 상장기업 중 유상증자를 실시한 523 기업-분기를 대상으로 분석을 수행한 결과는 다음과 같다. 첫째, 일반공모를 통한 유상증자 기업은 다른 유형의 유상증자 기업에 비해 유상증자 전 분기의 이익을 유의하게 상향조정하는 것으로 나타났다. 이는 기존주주의 부가 침해될 가능성이 높은 일반공모의 경우에 신주 발행가액을 높이기 위한 양(+)의 이익조정이 가장 두드러지게 나타남을 보여주는 결과이다. 둘째, 제3자배정을 통해 유상증자를 실시한 기업의 유상증자 전 이익조정은 주주배정 유상증자 기업과 유의한 차이를 보이지 않았으나, 제3자배정의 유상신주 인수자가 기업 내부자(임원 및 대주주)인 경우에는 오히려 유상증자 전 분기이익을 유의하게 하향조정하는 것으로 나타났다. 이는 유상증자에 참여하는 투자자의 특성에 따라, 경영자가 기존주주의 부를 침해하는 방향으로 이익조정을 수행할 수도 있음을 보여주는 결과이다. 마지막으로, 유상증자 전 분기의 이익조정은 체계적인 주가반응을 유도함으로써 경영자가 의도한 방향대로 신주 발행가격 조정이 이루어지는 것으로 나타났다. 본 연구의 결과는 선행연구에서 지지된 ``유상증자 전 이익상향조정가설``이 모든 유상증자 방식에 공통적으로 적용될 수 있는 가설이 아님을 시사한다. Prior research reports that issuers of seasoned equity offerings (hereafter ``SEO``) have incentives to inflate reported earnings in order to increase offering price and protect the wealth of existing shareholders. However, we predict that these incentives can vary with the types of SEO(right offering, public offering, private placement to the third party). While firms with right offering raise equity fund from existing shareholders, firms with public offering and private placement to the third party raise equity fund from new shareholders. Considering the differences in wealth transfer structure, manager``s incentives to raise reported earnings in order to boost offering price may be weaker in case of right offering than the other two SEO types. In addition, private placement to the third party raise equity fund from a few investors, who generally have special relationship with SEO firms such as insiders. If some insiders participate in SEO under private placement to the third party, the SEO firms may have incentives to lower reported earnings in order to reduce offering price for the benefit of the insiders, resulting in wealth losses of existing shareholders. So this study examines how earnings management patterns vary with the three different types of SEO. We also predict that offering firms are more likely to manage earnings in the quarter preceding SEO. By regulations, offering price is calculated by stock prices for 42 days before SEO dates(payment date of investing amount for SEO). This suggests that SEO firms can manage earnings in the quarter immediately preceding SEO in order to boost stock price, affecting offering price. So we use quarterly discretionary accruals as a proxy for earnings management. We use a sample of 523 SEO firms during 2004-2009. They consist of 232 firms with right offering, 58 firms with public offering and 233 firms with private placement to the third party. To measure earnings management, we use performance matched discretionary accruals developed by Kothari et al.(2005). We find that firms with public offering conduct more income-increasing earnings management using quarterly earnings than firms with rights offering. In addition, the results show that there are no significant differences in earnings management between firms with private placement to the third party and firms with right offering. However, managers may have incentives to manage earnings downward and thereby decrease offering price when insiders purchase a portion of new issuing shares of firms with private placement to the third party. Consistent with our prediction, firms with private placement to the third party involving insiders show the income-decreasing earnings management. This means that SEO firms can reduce the earnings and lower the offering price to increase the wealth of specific investors such as insiders, not to increase the wealth of existing shareholders. These results support our hypothesis that earnings management patterns vary with the three different types of SEO. Finally, we find that the offering prices move to the direction consistent with earnings management by SEO, implying that on average, managers can achieve the intended results by earnings management. This paper provides new evidence that incentives for earnings management vary depending on each type of SEO and the assertion of income-increasing earnings management by SEO may not be always correct. Our study contributes to the literature in three ways. First, prior research mainly focused on the earnings management by SEO firms using annual earnings. But offering price is calculated by the specific formula under Korean regulations. We consider the institutional details related to offering price determination and incorporate them into our research design. We find that quarterly earnings have a more direct effect on the offering price than annual earnings. Our contribution is that we use quarterly earnings rather than annual earnings to investigate earnings management by SEO firms, enabling us to pinpoint earnings management period. Second, we show the earnings management patterns vary with the three different types of SEO while most of the prior studies do not consider SEO types. Therefore, the assertion that SEO firms typically inflate their earnings before issuing stocks is not always correct. Third, prior studies do not examine the outcome of earnings management. We investigate whether the actual offering prices move to the direction consistent with earnings management by SEO. We show that managers achieve the intended results by earnings management.
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공공미술과 디자인에 있어서 상호작용성 참여요소에 관한 연구
안성희 ( Sung Hee Ahn ),이한나 ( Han Na Lee ) 한국공간디자인학회 2013 한국공간디자인학회논문집 Vol.8 No.3
(Background and Purpose)Public art and design has been given a critical role in terms of its contribution to culture-led urban regeneration and space branding, especially in the broad term of city branding, since late 20th Century. This research deals with the elements working in the process of interactive ``participation’process in public art and design project. It is for understanding of participation-based public art and design`s process mechanism which is an alternative solution for 2nd generation of culture-led urban regeneration by human-centered approach. (Method)From the literature reviews which catalysts through intervention, questioning global consumerism, political power and other rigid systems in urban culture, the viewpoint and framework has been developed. Selected, every 20 case was analysed by ``invitation element`` and ``participation element`` to develop model. (Result)Through the analysis of 20 public art and design cases, final analysis model shows the process and the relationship between two elements in participation process and offers the understanding about new viewpoint on human participation process and programs. (Contribution)It is for leading practitioners and researcher, as a means to develop strategies and achieve consistent added-value in participation based art and design projects.
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