Factors Affecting the Postoperative Mortality in the Ruptured Abdominal Aortic Aneurysm

안효영,정성운,이충원,김민수,김상필,김창원 대한흉부외과학회 2012 Journal of Chest Surgery (J Chest Surg) Vol.45 No.4

Background: Although patients with a ruptured abdominal aortic aneurysm (RAAA) often reach the hospital alive, the perioperative mortality is still very high. We retrospectively reviewed thirty patients who underwent repair of RAAA to identify the factors affecting postoperative mortality in a single hospital. Materials and Methods: Between September 2007 and May 2011, thirty patients with RAAA underwent emergent surgery (n=27) or endovascular aneurysm repair (n=3). Their medical records were retrospectively reviewed regarding three categories: 1) preoperative patient status: age, gender, vital signs, serum creatinine, blood urea nitrogen, hematocrit, and hemoglobin level: 2) aneurysmal status: size, type, and rupture status; and 3) operative factors: interval time to operating room, operative duration, and amount of perioperative transfusion. Results: The 30-day postoperative mortality rate was 13.3% (4/30); later mortality was 3.3% (1/30). On multivariate analysis, the initial diastolic blood pressure (BP), interval time to operating room and amount of preoperative packed cell transfusion were statistically significantly linked with postoperative mortality (p<0.05). Conclusion: In this study, preoperative diastolic BP, preoperative packed cell transfusion amount and interval time between arrival and entry to operating room were significantly associated with postoperative mortality. It is important to prevent hemorrhage as quickly as possible.

Commentary: Is the Data Strong Enough to Prorocolize the Approach in Diaphragmatic Hernia Repair? Aspects of Technique and the Sample Size of a Longitudinal Single-Center Study

안효영,이호석 대한흉부외과학회 2023 Journal of Chest Surgery (J Chest Surg) Vol.56 No.3

Single-Incision Video-Assisted Thoracoscopic Surgery for Benign Mediastinal Diseases: Experiences in Single Institution

안효영,조정수,김영대,이호석,이종근 대한흉부외과학회 2013 Journal of Chest Surgery (J Chest Surg) Vol.46 No.5

With advancement of the technique of video-assisted thoracic surgery (VATS), some surgeons have made great efforts to reduce the number of incisions in the conventional three- or four-port approach. Several studies on cases treated by single-incision VATS and their short-term outcomes were reported. Here, we present our experience with single-incision VATS for the treatment of benign mediastinal diseases.

Surgical Outcomes of Pneumatic Compression Using Carbon Dioxide Gas in Thoracoscopic Diaphragmatic Plication

안효영,김영대,이호석,조정수,이종근,손주형 대한흉부외과학회 2016 Journal of Chest Surgery (J Chest Surg) Vol.49 No.6

Background: Surgical correction needs to be considered when diaphragm eventration leads to impaired ventilation and respiratory muscle fatigue. Plication to sufficiently tense the diaphragm by VATS is not as easy to achieve as plication by open surgery. We used pneumatic compression with carbon dioxide (CO2) gas in thoracoscopic diaphragmatic plication and evaluated feasibility and efficacy. Methods: Eleven patients underwent thoracoscopic diaphragmatic plication between January 2008 and December 2013 in Pusan National University Hospital. Medical records were retrospectively reviewed, and compared between the group using CO2 gas and group without using CO2 gas, for operative time, plication technique, duration of hospital stay, postoperative chest tube drainage, pulmonary spirometry, dyspnea score pre- and postoperation, and postoperative recurrence. Results: The improvement of forced expiratory volume at 1 second in the group using CO2 gas and the group not using CO2 gas was 22.46±11.27 and 21.08±5.39 (p=0.84). The improvement of forced vital capacity 3 months after surgery was 16.74±10.18 (with CO2) and 15.6±0.89 (without CO2) (p=0.03). During follow-up (17±17 months), there was no dehiscence in plication site and relapse. No complications or hospital mortalities occurred. Conclusion: Thoracoscopic plication under single lung ventilation using CO2 insufflation could be an effective, safe option to flatten the diaphragm.

Non-conservative Management of Chylothorax

안효영,이호석 대한흉부외과학회 2021 Journal of Chest Surgery (J Chest Surg) Vol.54 No.4

Chylothorax is caused by lymphatic leakage, which can develop after thoracic surgery and is associated with cancer. Although prospective randomized trials have not been performed, radiological interventions have been performed in several cases with persistent chylothorax, adjunct to 2 weeks of conservative management. The success rate of such interventions is diverse due to anatomical variations, although the results are promising. However, in cases of treatment failure after cycles of interventions, a team approach may be necessary to determine whether surgical management is warranted.

17x17 타입 MOX 핵연료 집합체의 핵적 특성 연구

안효영,하창주 한국에너지학회 2018 한국에너지공학회 학술발표회 Vol.2018 No.04

초등 및 중학생의 교우 및 교사관계가 수업참여와 공부시간에 미치는 영향

안효영(Hyo-Young Ahn),도승이(Seung-Lee Do) 중앙대학교 한국교육문제연구소 2014 한국교육문제연구 Vol.32 No.1

본 연구는 초등 및 중학생의 교우관계, 교사관계가 수업참여, 공부시간에 어떠한 영향을 미치는가를 탐구하는데 목적이 있다. 나아가, 학년급 차이에 따라 이들 변인이 어떻게 변화하여 나타나는지 알아보고자 하였다. 연구대상은 한국청소년정책연구원의 한국아동청소년패널조사(KCYPS)의 1차년도 자료를 사용하였고, 초등학교 1학년, 4학년, 중학교 1학년 학생과 학부모 데이터를 사용하였다. 분석방법으로 기술통계, 상관분석 및 중다회귀분석이 실시되었다. 연구결과, 학년이 올라감에 따라 초등 및 중학생의 교우관계, 교사관계의 친밀감이 감소하였다. 수업참여도 학년급이 올라갈수록 긍정적인 면이 감소하였다. 학교나 학원 숙제 외에 공부시간은 초등학교 1학년이 가장 적었고 학년이 올라가면서 늘어나는 경향을 보였으나, 중학교 1학년보다는 초등학교 4학년이 개인공부시간이 더 많았다. 초등 및 중학생의 교우관계, 교사관계, 수업참여, 공부시간의 상관분석은 대부분 유의하였으나, 초등학교 1학년의 각 변인과 공부시간과의 관계는 유의하지 않은 것으로 나타났다. 모든 학년급에서 교우관계, 교사관계가 수업참여에 긍정적인 영향을 미쳤다. 초등학교 4학년, 중학교 1학년의 교우관계와 교사관계는 공부시간의 증가와 유의미 하였지만 설명력은 낮았다. 이 연구는 부모와 교사 등 교육관계자에게 초등 및 중학생의 시기별 교우, 교사와의 관계 양상을 알려주고, 학생들을 어떻게 교육하여야 하는지에 관한 정보를 제공한 것에 의의가 있다. The purpose of this research was to investigate the influence of peer relationships and child-teacher relationships, which result in school engagement and the hours of independent-study. The subjects of this study are 1st and 4th graders of elementary school and 1st graders of middle school. We used the first year data (surveys from 2010) of ‘Korean Children and Youth Panel Survey’, which were collected from Korean students nationwide by the National Youth Policy Institute. The main findings were as follows: 1) Children tend to decrease in peer relationships and child-teacher relationships when they grow older. 2) The 1st graders of elementary school spend the fewest hours on independent-study. In comparison to 1st graders of middle school, the 4th graders of elementary school showed an increase of hours of independent study. 3) Peer relationships and child-teacher relationships showed significant influence on school engagement for all graders. Except for elementary school first graders, peer relationships and child-teacher relationships influenced hours of independent study.

폐질환에서 두 개의 창을 이용한 흉강경 수술 : One-port one-window (OPOW) technique in thoracoscopic surgery in patients with pulmonary diseases

안효영 ; 김영대 ; 이호석 ; 조정수 부산대학교 병원 암연구소 2014 부산대병원학술지 Vol.- No.36

또래괴롭힘 상황에서의 주변인 역할 연구동향 및 과제

안효영(Ahn Hyo young),진영은(Chin Young eun) 한국열린교육학회 2014 열린교육연구 Vol.22 No.4

본 연구는 또래괴롭힘 상황에서의 주변인 역할을 중심으로 논의하였다. 또래괴롭힘 상황에서 직접 당사자인 가해자, 피해자 보다 주변인인 일반 학생이 다수를 차지한다. 주변인 연구는 이러한 다수의 역할행동에 관심을 가짐으로써 또래괴롭힘을 감소시킬 수 있다는 생각에서 출발한다. 이를 위해 또래괴롭힘 상황에서의 주변인 역할을 다룬 국내의 학술지 논문, 석ㆍ박사학위논문 총 57편을 분석하였다. 국내 연구의 대부분은 주변인의 역할을 유형별로 나누어 연구하였다. 주변인은 동조자, 강화자, 방어자, 방관자의 역할유형으로 분류되고 있다. 방어자는 대부분의 특성이 긍정적으로 나타났고, 동조자와 강화자는 비슷한 특성을 보였다. 동조자 및 방관자는 방어자와 대조되는 경향이 있다. 주변인의 역할행동에 영향을 미치는 요인들은 개인특성, 학교환경 및 사회적 인지, 가족환경, 도덕변인으로 나누어 개관하였다. 이러한 요인들에 따라 또래괴롭힘 상황에 있는 주변인들은 다른 역할행동을 하는 것으로 나타났다. 개인특성과 학교환경은 주변인의 역할행동에 영향을 미치는 중요한 요인이었다. 또래괴롭힘 감소를 위한 실천적인 과제로 주변인 역할의 사회생태관점에서의 이해, 주변인 역할의 변화 가능성에 초점 맞추기, 방어자 역할을 하도록 하는 교육과 환경 조성, 질적연구의 확충을 제안하였다. 본 연구를 통해 주변인 역할에 대한 이해를 넓히고 또래괴롭힘 감소에 기여하고자 한다. This paper explores the role of bystanders in bullying situations. In any general student population, there are many more bystanders than there are bullies and victims directly associated with bullying. Bystanders research starts from the idea that to reduce bullying one must understand role behaviors. For this, a total of 57 papers of domestic theses and dissertations were analyzed that researched the role of bystanders in dealing with bullying situations. Most of the domestic research studied divided the bystander roles into assistants, reinforcers, defenders, and outsiders. When analyzing these roles, defenders showed the most positive characteristics. Assistants showed similar properties with reinforcers. And, assistants and outsiders contrasted with the defenders. This study surveyed individual characteristics, school environment, family environment, and moral variables as factors that affect the role behaviors of bystanders. Depending on these factors, bystanders' role behaviors in bullying situations exhibited differences. Individual characteristics and school environment, in particular, had a major influence on bystanders' role behaviors. This paper suggests practical tasks to be made based on the research of bystanders' roles to help reduce bullying. The tasks are understanding the social ecological perspective of the role of bystanders, focusing on the possibility of changing bystanders' roles, to educate and create a positive atmosphere for a defenders actions, and the expansion of qualitative research. The broadening of the understanding of bystander's roles throughout this study was done to contribute to a reduction of bullying.

집단 지성 기반 비즈니스 모델 사례 연구

안효영 ( Hyo Young Ahn ),이준기 ( Zoon Ky Lee ) (주)엘지씨엔에스(구 LGCNS 엔트루정보기술연구소) 2013 Entrue Journal of Information Technology Vol.12 No.1

기업은 제한적인 내부 자원의 한계를 인식하고, 아웃소싱, 개방형 혁신, 크라우드 소싱 등 외부 자원과의 다양한 협력방식을 시도해왔다. Wikipedia, eBay나 YouTube 등의 개방형 협업 방식을 적용한 다양한 글로벌 사례가 증가하고 있으나, 국내 비즈니스 환경에서의 성공사례는 많이 언급되고 있지 못하다. 그래서 본 연구에서는 국내 IT선도기업에서 수행하는 대표적인 집단지성 비즈니스 모델로서의 공모전 모델을 선정하여, 선행 연구 기반의 비즈니스모델 분석 프레임워크에 의해 분석하였다. 특히 ``개방형 협업(Open Collaboration)``을 비즈니스모델에 적용 가능한 ``수집, 협력생산, 결정, 집합``의 4가지 비즈니스 기능으로 정의하였다. 연구 결과, 효과적인 개방형 협업 기능 적용을 위해서는 활용 목적과 목적에 적합한 실행구조를 고려해야하며, 추후 실행 구조 관리 관점에서의 통제 방안에 대해서도 중요하게 연구되어져야 할것임을 알 수 있었다. 본 연구에서 제시된 이슈를 통해 이러한 연구를 기반으로 국내 다양한 사례에 대한 실증적 연구가 이루어져야할 것이다. Enterprises recognize the limitations of the internal resources, and try to use collaborative approach such as outsourcing, open innovation, crowd sourcing, and a variety of external resources. Various global cases, such as Wikipedia, eBay or You-Tube, applying the Open Collaboration model are increasing, but the successes in the domestic business environment, not be-ing mentioned much less. In this research, ``Competition`` model of the leading companies in the domestic IT representative to perform collective intelligence was selected and analyzed by previous research-based framework. Especially, ``Open Collabo-ration`` can be defined as a set of four business functions applied to business model, such as ``Collection, Co-creating, Match-ing, Aggregation``. As a result, consider the execution structure suitable for the purpose and the goal, in order to apply effective open collaboration function capabilities, and control measures for the future running of the structure from a management perspective need to be studied seriously. Through the issues presented in this study, the empirical research on various cases domestic will be studied based on these studies.