단일 기관에서 소아 굴곡성 기관지내시경에 대한 임상 경험

안혜성 ( Hye Sung Ahn ),최은정 ( Eun Jeong Choi ),윤현진 ( Hyun Jin Yun ),왕승문 ( Sheng Wen Wang ),권은영 ( Eun Young Kwon ),황규근 ( Kuy Geun Hwang ),이영석 ( Young Seok Lee ),정진아 ( Jin A Jung ) 대한소아알레르기호흡기학회(구 대한소아알레르기 및 호흡기학회) 2011 소아알레르기 및 호흡기학회지 Vol.21 No.3

Purpose: This study was performed to investigate the indications, bronchoscopic findings, results of bronchoalveolar lavage, and complications and to report the clinical features of using flexible bronchoscopy for respiratory diseases in children. Methods: We studied 105 patients who underwent flexible bronchoscopy at the Department of Pediatrics, Dong-A University Medical Center from June 2001 to June 2008. A bronchoalveolar lavage (BAL) was performed if need, and the BAL fluid was cultured for bacteria and fungi. We performed an acid-fast bacilli (AFB) smear and culture. Result: The most common indication for flexible bronchoscopy was suspected pulmonary tuberculosis (37 cases, 35.2%). The most common abnormal finding was excessive secretion, which was found in 53 cases (50.4%). BAL bacterial cultures were performed in 10 of 38 cases, and Hemophilus influenza was the most common organism and was found in three cases (7.8%). There were 17 AFB culture-positive cases (49.3%) among the 37 suspected pulmonary tuberculosis cases. Among these 17, the Tb-polymerase chain reaction (Tb-PCR) was conducted for four cases (23.5%) but only two cases (50%) were positive. TB-specific antigen-induced interferon-gamma was performed in four cases (23.5%), and all four cases (100%) were positive. Conclusion: Pediatric flexible bronchoscopy has made it possible to vary the indication and subjects. It was also safe and effective if used carefully. Further study should be conducted to develop safe and useful technology to overcome the limitations. [Pediatr Allergy Respir Dis(Korea) 2011;21:226-233]

복강 내 미주신경에 발생한 퇴행성 신경초종의 복강경하 절제술

안혜성(Hye Seong Ahn),박도중(Do Joong Park),이혜승(Hye Seung Lee),이혁준(Hyuk-Joon Lee),김형호(Hyung-Ho Kim),양한광(Han-Kwang Yang) 대한외과학회 2006 Annals of Surgical Treatment and Research(ASRT) Vol.71 No.6

외과 환자에 있어서의 면역영양

안혜성 ( Hye Seong Ahn ),허승철 ( Seung Chul Heo ) 한국정맥경장영양학회 2012 한국정맥경장영양학회지 Vol.5 No.1

Patients undergoing major surgery are at increased risk of developing post-operative complications. In the last years, several clinical studies and meta-analyses focused on the potential clinical benefits of perioperative immunonutrition in surgical patients and showed contradictory results with regard to complications. The aim of this study is to summarize the concept of immunonutrition and the results of those clinical trials and to draw recommendations about the current indications of immunonutrition in surgery. A range of nutrients, including several amino acids, antioxidant vitamins and minerals, long-chain n-3 fatty acids, and nucleotides have been shown to upregulate the host immune function, modulate inflammatory response, and improve gut barrier function after surgery. Several experimental studies have been carried out that support potential benefits of these nutrients in the surgical patients. The majority of the randomized trials found that perioperative immunonutrition improved short-term outcomes in patients who underwent elective major gastrointestinal (GI) surgery. Five meta-analyses including a large number of randomized clinical trials showed that perioperative immunonutrition is associated with a reduction in both the infection rate and the length of hospital stay. These results have been demonstrated in all patients undergoing both the upper and lower GI surgery, regardless of their baseline nutritional status. Promising results have been obtained also in head and neck surgery. Considering these findings, perioperative immunonutrition should be implemented in patients undergoing elective major GI surgery. The use of perioperative immunonutrition could reduce both postoperative morbidity and costs for healthcare systems. However, large- scale trials are required before recommending the routine use of immunonutrition in head and neck surgery. (JKSPEN 2013; 5(1):10-14).

아이디스(IDIS)

안혜성(He Soung Ahn),김봉선(Bongsun Kim),김희천(Hicheon Kim) 한국경영학회 2016 Korea Business Review Vol.20 No.1

1997년에 창업된 아이디스는 범죄예방 및 감시 목적으로 설치된 보안용 영상감시 시스템에서 촬영되는 영상을 저장하는 Digital Video Recorder(DVR) 전문회사로 세계시장에서 명실상부한 ‘히든 챔피언’으로 인정받고 있는 국내의 강소기업이다. 본 사례는 영상저장장치 시장이 아날로그에서 디지털로 기술이 개편되는 시기에 아이디스가 DVR 시장에 성공적으로 진출하여 성장하는 과정을 제품개발과 시장개척 전략으로 나누어 살펴봄으로써, 신규 벤처기업이 기존에 존재하던 산업에서 특화된 경쟁력을 기반으로 이뤄낸 성공에 대한 시사점을 도출하고자 한다. 더 나아가 최근 들어 일어나고 있는 Internet Protocol(IP) 기반으로 기술변화에 직면한 아이디스가 통합보안솔루션 전문업체로 도약하기 위해 취하는 전략적 변화를 소개하며 벤처기업이 성장하면서 직면하는 과제에 대한 시사점을 제공하고자 한다. Founded in 1997, IDIS specializes in the Digital Video Recorder (DVR) which is a device for storing recordings that CCTV cameras capture for surveillance purposes. Since its inception, IDIS has grown to become the world’s leading developer of DVRs and earning the reputation of a‘hidden champion.’ This case examines how IDIS successfully entered and competed in the DVR market when a window of opportunity opened as the recording technology evolved from analog to digital. Based on a detailed analysis of the product development and market penetration strategies of IDIS, implications for how a startup firm can compete effectively in an existing industry are drawn. Furthermore, as the video surveillance industry is recently facing another wave of technological change based on Internet Protocol(IP), the strategic responses of IDIS to transform itself into a total security solution provider are described. The implications for the set of challenges that startups face as they push for growth to new heights are discussed.

원발성 십이지장 선암의 수술적 치료 및 성적

안혜성(Hye Seong Ahn),장진영(Jin-Young Jang),이승은(Seung Eun Lee),양성훈(Sung Hoon Yang),이건욱(Khun Uk Lee),김선회(Sun Whe Kim) 대한외과학회 2007 Annals of Surgical Treatment and Research(ASRT) Vol.72 No.1

Purpose: Because of the rarity of primary duodenal adenocarcinomas, the factors affecting the management and survival of patients with this disease remain controversial. This study analyzed the nineteen-years of experience gained at one institution to define the surgical management and outcomes of patients with primary duodenal adenocarcinomas. Methods: A retrospective review of 77 patients, who underwent surgery for a primary duodenal adenocarcinoma at Seoul National University Hospital, between May 1985 and April 2004, was undertaken. The dermographics symptoms, operative variables, surgical pathology and survival data were analyzed. Results: A curative resection was performed in 40 patients (51.9%); a pancreaticoduodenectomies and/or resection of other organs, pancreas head resection with a duodenal segmentectomy and a segmental duodenectomy and resection of another organ in 37, 2 and 1, respectively. The remaining 37 patients underwent a palliative resection or bypass. The hospital mortality and complication rates were 2.6% (2 patients) and 42.9% (33 patients), respectively. The overall 5-year survival was 26.8%. The 5-year survival for the curative resection group was 42.7%, whereas that for the palliative surgery group was 0%. In a univariate analysis, nodal metastasis was found to have a significant negative impact on survival after a curative resection (P=0.028). The patients’ age, sex, operative procedure, tumor size, histologic type, differentiation and tumor depth had no influence on survival. Conclusion: A curative resection is associated with increased survival in patients with a duodenal adenocarcinoma. Following a curative resection, nodal metastasis is an independent prognostic factor. Therefore, the early diagnosis should be sought to achieve a curative resection and increased survival. As a curative resection, a pancreati-coduodenectomy is usually required, and a segmental duodenal resection may be appropriate in selected patients, especially in early duodenum cancers.

예비 영어 교사의 마이크로티칭 수업 및 평가에 대한 인식 연구

안혜성(Hyeseong Ahn),박매란(Mae-Ran Park) 한국응용언어학회 2020 응용 언어학 Vol.36 No.2

Recent implementation efforts on teaching English through English and the increasing need for improving English teachers’ overall teaching competence, have demanded the implementation of reflective teaching practices in teacher preparation programs. Recognizing these demands, the purpose of the current research was to examine the microteaching training and evaluation processes in a graduate-level teaching practicum at a Korean university. In particular, the study aimed to explore how pre-service English teachers perceive the instruction of microteaching evaluation and its connection with their teaching practicum experiences. In this study, 17 pre-service English teachers completed a survey and completed reflective journal writing over the course of a semester. The results from the survey and journal analysis showed overall, that pre-service teachers found the microteaching evaluation very helpful, especially in assisting them with their lesson planning, lesson organization, and in enhancing overall confidence in their actual teaching. In addition, they perceived their instructor’s evaluation to be the most helpful among different evaluation parties (i.e., instructor, peers, and self), specifically in realizing and identifying the strengths and weaknesses in their teaching practice. The findings of the study suggest a further need to modify the microteaching process and tailor to the needs of real classroom demands, as indicated in the pre-service teachers’ reflective teaching journals.

서울시 주택 예상투자이익 추정과 영향요인에 대한 시론적 분석 - 2010-2018년 주택 실거래가를 중심으로 -

안혜성(Ahn, Hye-Sung),강창덕(Kang, Chang-Deok) 한국지역학회 2020 지역연구 Vol.36 No.1

이 연구는 투자이론에서 활용되고 있는 토빈의 Q 개념을 적용하여 투자이익을 측정하고 이를 통해 서울 주택시장을 이해하고자 한다. 구체적으로 서울시 아파트와 연립·다세대주택을 대상으로 2010년부터 2018년 까지 투자이익을 추정하고 공간계량모형을 이용하여 투자이익에 영향을 주는 요인들을 살펴보았다. 투자이익은 실거래가격에서 대체비용(토지비용+건축비용)을 빼는 방식과 실거래가격 대비 대체비용의 비율로 각각 추정하였다. 분석결과를 보면, 투자이익은 2018년으로 갈수록 더 커졌고 강남·서초구 및 한강 주변에서 투자이익이 높게 나타났으나 투자이익의 시공간적 변화양상은 아파트의 경우 뚜렷한 반면에 연립·다세대주택은 산발적·국지적으로 나타났다. 공간계량모형 분석결과는 주택유형과 상관없이 고밀·신축개발이 많은 지역에서 투자이익이 높았다. 이 연구의 접근방법과 결과는 향후 주택 공급 정책, 투자이익 환수, 지역 경쟁력 측정, 가격 거품 측정 등에 대한 논의를 위한 기초 자료가 될 것이다. Estimating investment profits of real estate is critical to understand real estate markets and create relevant policy as real estate market and capital market combines closely. Thus, this study applied the concept of Tobin’s Q to estimate investment profits for apartments as well as row-houses and multi-family homes in Seoul from 2010 to 2018. Investment profits were estimated by two approaches: subtracting the replacement cost from the transaction price and calculating ratio of the transaction price to the replacement cost, respectively. The spatio-temporal changes in investment profits were apparent in apartments compared with row-houses and multi-family homes. As a result of analyzing the spatial econometrics models, the investment profit was higher in the area with high density and new developments regardless of the housing types. The framework and key findings would be the effective reference to understand residential investment behavior, create relevant housing policy, introduce value capture of windfall, measure regional competitiveness, and estimate housing bubble.

RIDING OFF INTO THE SUNSET? THE “GENERATIONAL SHADOW” AND DESCENDANT CEOS’ ACQUISITION DECISIONS IN PUBLICLY LISTED FAMILY-CONTROLLED FIRMS

He Soung Ahn(안혜성),Hicheon Kim(김희천) 한국인사조직학회 2017 한국인사ㆍ조직학회 발표논문집 Vol.2017 No.2

Comparative analysis of BMS according to surgical type

Hye Seong Ahn(안혜성),Hyuk Joon Lee(이혁준) 대한외과학회 2014 대한외과학회 학술대회 초록집 Vol.2014 No.11

초등영어캠프에서 한·영 스토리텔링 활용이 학습자의 정의적 영역과 어휘력 향상에 미치는 효과

안혜성,방준,Ahn. Hye-Seong,Bang. Jyun 팬코리아영어교육학회(구 영남영어교육학회) 2015 영어교육연구 Vol.27 No.2

The purpose of this study is to analyze the effects of Korean-English storytelling on the development of elementary school students’ vocabulary abilities and affective domain. The experimental instruction was given to 40 third to sixth grade students in elementary school. Over a period of two weeks during which time they covered 40 hours worth of material from nine different chapters, three types of tests and two types of questionnaires were administered, in order to examine the effects of the experiment on the students’ vocabulary abilities and affective domain. The results are summarized as follows. First, over 90 percent of the students responded that they were satisfied with learning vocabulary using storytelling. Second, the results of the post-test show the scores greatly improved since the pre-test. Third, the results of the delayed-test show the scores are higher than the pre-test. There were positive results in the students’ affective domain. To conclude, the findings show that using Korean-English storytelling can be a powerful learning method to enhance students’ vocabulary ability. Further study should be developed but the preliminary results look promising when efficiently applied to English Education.