• 정보교육학회논문지
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• 제23권1호
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• pp.1-8
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• 2019

초등교원을 양성하는 교육대학교에서 SW교육을 강화시키기 위한 교육과정을 개발하는 데 필요한 기초 자료를 마련하기 위해 G교육대학교 학생 1,260명을 대상으로 설문조사를 실시하였다. 그 결과를 정리하면 다음과 같다. 첫째, 교육대학교 학생들을 대상으로 한 SW교육 시간을 늘리고, SW교육 역량을 제고할 수 있도록 교육 내용을 개선할 필요가 있다. 둘째, 교양 과정에서의 SW를 활용한 교수법과 교재를 개발하고, 그것을 위한 시수가 확보되어야 한다. 셋째, 전공 과정에서는 교과 내용학 보다는 교과 교육학을 중심으로 한 교육 내용이 확대되어야 한다. 넷째, 심화 과정에서는 초등학교 교육과정과의 연계를 높일 수 있도록 엔트리 등 교육용프로그래밍언어를 중심으로 한 프로그래밍 교육이 강화되어야 한다. 또한, 심화과정에서의 필수 과목을 줄이고 선택과목을 늘림으로써 학생들의 과목 선택권을 확대할 필요가 있다.

• 정보교육학회논문지
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• 제23권4호
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• pp.303-314
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• 2019

2015개정 교육과정에 의해 2019년부터 초등학교 5, 6학년을 대상으로 실과과목에서 정보교육이 진행되고 있지만, 국외에서는 초등학교 저학년부터 정보교육을 시행하는 경우가 많다. 이에 본 연구는 초등학교 저학년의 특성을 고려한 프로그래밍 언어의 선택 방향성을 제시하기 위한 목적이 있다. 목적 달성을 위해 저학년의 발달특징과 교육용 프로그래밍 언어의 필요요소를 고려하여 평가 준거를 개발하였다. 준거에 근거하여 두 언어의 사용성을 분석한 결과는 다음과 같다. 첫째, 비스킷은 학령이 낮은 학생의 표현력 고려, 프로그래밍의 개념에 대한 학습 없이 알고리즘 익히기 등에 활용할 수 있으며, 둘째, 스크래치 주니어는 알고리즘이나 프로그래밍에 대한 개념 학습에 용이한 것으로 나타났다. 본 연구는 향후, 초등학교 저학년 대상의 프로그래밍 교육을 대비하여 학생들의 발달 상태를 고려한 시사점을 제시했다는데 의의가 있다.

• 한국기계가공학회지
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• 제20권7호
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• pp.105-112
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• 2021

Reduction of weld distortions and increase in productivity are some of the major goals of the shipbuilding industry. To address these issues, many researchers have attempted to apply new welding processes. In the shipbuilding industry, steel is the candidate material of choice owing to its good weldability. However, conventional welding techniques are not feasible for avoiding welding problems. Tip-rotating arc welding is one of the high-efficiency welding process that has several advantages, such as high welding speed, high melting rate, low heat input, and less distortion. The present study investigates the influence of the welding variables on the weld characteristics of tip-rotating arc welding. Welding was performed using EH36 as the base metal and SM-70s as the filler metal, which are widely used in shipbuilding. Basic experiments were conducted to understand the effects of the major welding variables, such as welding and tip-rotating speeds. The distortion and mechanical properties of the optimal welding conditions were used to evaluate the tip-rotating arc welding performance. Consequently, the feasibility of the tip-rotating arc welding process for joining steel components was investigated, so that the optimized welding conditions could be applied directly to ship body welding to enhance the quality of the welded joints.

• 서비스연구
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• 제11권3호
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• pp.17-30
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• 2021

최근의 공유경제(Sharing Economy) 비즈니스 모델의 중요성이 부각되면서 경제활동은 단순한 상품 매매에서 벗어나 복잡한 경험체험으로 바뀌고 있고 공유숙박(Sharing Accommodation)의 모델 또한 새로운 숙박 선택모델로 자리 잡았다. 본 논문은 고객이 공유숙박서비스를 체험하는 과정에 느낀 문제점을 고찰하여 공유숙박서비스의 최적화 전략을 제시함으로써 기존의 단점을 개선하고 고객만족도를 제고하기 위한 목적으로 연구를 진행하였다. 본 연구는 Airbnb와 Tujia 두 개의 공유숙박모델을 대상으로 비교 연구를 진행하고 참고 문헌 수집과 정리를 통해 숙박 공유연구 배경을 심층 분석하였다. 고객여정도(Customer Journey Map), 페르소나(Persona), 서비스 블루프린트(Service Blueprint) 등 서비스디자인 연구방법을 활용하여 고객 수요를 파악하고 서비스의 문제점을 발견함으로써 서비스를 최적화하는 방안을 제시하고자 하였다. Kano 모델(Kano Model)과 잠재적 고객만족 개선지수(Potential Customer Satisfaction) 등의 연구방법으로 검증한 후 세 가지 서비스 최적화 방안을 확정하여 서비스 시나리오(Service Scenario) 모형을 통해 최적화한 성과를 도출하였다. 본 연구의 결과는 공유숙박의 사업자 식별, 서비스 요소 개선과 보다 높은 수준의 고객 체험 제공에 도움이 되며, 더 나아가 공유숙박 시장의 건전한 발전을 촉진할 것이라 확신한다.

• 치위생과학회지
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• 제23권4호
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• pp.271-281
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• 2023

Background: This study aims to improve dental hygiene education by investigating the relationship between metacognition, learning flow, and problem-solving abilities in dental hygiene majors. Methods: A survey was conducted on 2nd to 4th-year students from dental hygiene programs, with 132 responses analyzed. Data analysis involved t-tests and ANOVA to examine the differences in metacognition, learning flow, and problem-solving abilities based on the general characteristics. Multiple regression analysis was employed to investigate the factors influencing the dependent variable, which is problem-solving abilities. The collected data were analyzed using SPSS. Results: First, when comparing metacognition, learning flow, and problem-solving abilities based on the general characteristics of the study participants, statistically significant differences were observed in common factors such as major satisfaction, subjective academic performance, GPA (grade point average), and reason for major choice (p<0.05). Second, it was found that there is a significant positive correlation between metacognition, learning flow, and problem-solving abilities in dental hygiene students (r≥0.79, p<0.05). In other words, higher levels of metacognition and learning flow were associated with better problem-solving abilities. Third, factors influencing problem-solving abilities were identified, with both metacognition and learning flow having a statistically significant positive impact. It was also noted that metacognition had a greater influence on problem-solving abilities compared to learning flow (adjusted R²=0.815, p<0.05). Conclusion: To enhance the core competency of problem-solving abilities, it is essential to improve metacognition and learning flow. To enhance metacognition and promote learning flow, strategies such as goal setting, utilizing effective learning methods, boosting self-efficacy, managing the learning environment, choosing activities that foster immersion, stress management, self-assessment and feedback integration, improving focus, and utilization a variety of learning experiences will be necessary.

• Journal of Chest Surgery
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• 제56권6호
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• pp.394-402
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• 2023

Background: The optimal choice of valve substitute for aortic valve replacement (AVR) in pediatric patients remains a matter of debate. This study investigated the outcomes following AVR using mechanical prostheses in children. Methods: Forty-four patients younger than 15 years who underwent mechanical AVR from March 1990 through March 2023 were included. The outcomes of interest were death or transplantation, hemorrhagic or thromboembolic events, and reoperation after mechanical AVR. Adverse events included any death, transplant, aortic valve reoperation, and major thromboembolic or hemorrhagic event. Results: The median age and weight at AVR were 139 months and 32 kg, respectively. The median follow-up duration was 56 months. The most commonly used valve size was 21 mm (14 [31.8%]). There were 2 in-hospital deaths, 1 in-hospital transplant, and 1 late death. The overall survival rates at 1 and 10 years post-AVR were 92.9% and 90.0%, respectively. Aortic valve reoperation was required in 4 patients at a median of 70 months post-AVR. No major hemorrhagic or thromboembolic events occurred. The 5- and 10-year adverse event-free survival rates were 81.8% and 72.2%, respectively. In univariable analysis, younger age, longer cardiopulmonary bypass time, and smaller valve size were associated with adverse events. The cut-off values for age and prosthetic valve size to minimize the risk of adverse events were 71 months and 20 mm, respectively. Conclusion: Mechanical AVR could be performed safely in children. Younger age, longer cardiopulmonary bypass time and smaller valve size were associated with adverse events. Thromboembolic or hemorrhagic complications might rarely occur.

• 자원ㆍ환경경제연구
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• 제22권3호
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• pp.521-545
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• 2013

본 연구는 우리나라 4대강(한강, 금강, 영산강, 낙동강) 하구의 중요 속성(하구 유형, 하구 하천 수질, 하구 해수역 수질, 하구 생물다양성 수준)과 관련된 가치를 도출하기 위하여 진술선호법에 속하는 선택실험법(CE)을 이용하였다. 선택실험법에서 얻어진 자료에 대해서는 일반적으로 다항로짓모형(MNL)으로 분석하지만, 다항로짓모형의 기본 가정에 해당하는 IIA 성립 여부를 Hausman과 McFadden(1984)이 제시한 검정 통계량으로 검토한 결과에 따르면 본 연구 자료에서 IIA 가정은 모두 기각되었다. 그러므로 IIA의 가정을 완화한 이분산극치모형(HEV)과 다항프로빗모형(MNP)으로 분석한 결과, IIA 가정을 충족하지 못하는 자료를 다항로짓모형으로 분석하면 그로부터 도출된 추정계수 및 속성의 경제적 가치들을 상당히 왜곡하는 것으로 파악되었다. 다항프로빗모형(MNP)의 추정 결과에 따르면, 4대강에 속하는 한 하구가 자연 하구인 경우의 경제적 가치는 3,523억원(95% 신뢰구간 2,611억원~4,778억원)이다. 4대강에 속하는 한 하구 하천 수질이 한 등급 상승하면 4,115억원(95% 신뢰구간 3,385억원~5,255억원)의 경제적 가치를 갖는다. 한편 4대강 하구에 속하는 한 하구의 해수역 수질이 한 등급 상승하면 3,589억원(95% 신뢰구간 2,925억원~4,570억원)의 경제적 가치가 증가한다. 4대강 하구에 속하는 한 하구의 생물다양성이 한 등급 상승하면 1,519억원(95% 신뢰수준 990억원~2,186억원)의 가치가 증가한다. 그러므로 4대강 하구에 속하는 한 하구가 인공이 아닌 자연 하구이면서 하구 하천 수질이 좋은 수질(2급수) 수준, 하구 해수역 수질이 좋은 수질(1등급), 생물다양성이 높은 수준이면, 경제적 가치는 2조 1,970억원이며 95% 신뢰수준은 1조 7,210억원~2조 8,799억원으로 평가된다.

• Archives of Plastic Surgery
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• 제34권5호
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• pp.667-670
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• 2007

Purpose: Among the materials for cranioplasty, autogenous bone is ideal because it is less susceptible to infection and has lower rates of subsequent exposure. However, the procedure is technically demanding to perform and requires a donor site. Disadvantages further exist when the defect is large and there are attendant limitations in donor site. The authors present their experience with reconstruction of large skull defect using right-angled zigzag osteotomized outer table of autogenous calvarial bone, overcoming the limitation in donor site. Methods: From 2000 to 2006, 9 patients were retrospectively reviewed, who had undergone reconstruction with right angled zigzag osteotomized outer table of autogenous calvarial bone. Results: Aesthetically satisfactory skull shape was achieved. Major complications of infection, hematoma, plate exposure, and donor site complications of dural tear with bleeding, cerebrospinal fluid leak, and meningitis were not seen. One patient had delayed wound healing and was successfully managed conservatively. Conclusion: Autogenous bone is the material of choice for cranioplasty, especially in complicated cases. Right angled zigzag osteotomy is a useful method in reconstruction of large skull defects with less donor site morbidity.

• 가정과삶의질연구
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• 제11권2호
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• pp.134-146
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• 1993

The purpose of this study was to collect the datas about the child care arrangement and the needs of day care programs of teaching mothers with preschool children and to develop the more desirable day care programs for them. The objects were 255 teaching mothers with preschool children. The results were as follows: 1) Teaching mothers who didn't use the day care center tended to put their children in the care of the paternal or maternal grandmothers, Major contributions of those baby-sitters were to protect the children and make everyday life training (44.0%) 2) The first reason for the mothers who used the day care center was that they had no other hands for their children(43.7%) and next reason was that the concerns for their children's socialization(35.4%) 3) Teaching mothers did not want the day care service during the vacation except 20% of them. 4) Teaching mothers absolutely wanted the day care service center especially inside their jobsite(61.0%) than any other type of day care programs and also wanted supporting by the government(66.5%) About the choice criterions of the day care center nutrition health and safety were suggested as the most important factor. They also prefered the experience with other peers and the programs focusing on the emotional development of the children.

• 한국생활과학회지
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• 제21권2호
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• pp.315-329
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• 2012

The purpose of this study was to examine clothing purchase behavior of sports participants based on outdoor sports types and sports participation motivation. The research was conducted with the use of a self-administered questionnaire. A total of 703 respondents between the ages of 25 and 55 participated in the research through an internet survey. Motivation for participation in particular sports was comprised of four factors: impress others, mental rejuvenation, social interaction, and health maintenance/improvement. Perceived benefits of clothing choice were categorized into three factors: brand/fashion pursuit, positive image pursuit, and practicality pursuit. Outdoor sports activities was categorized into six types, climbing, jogging, cycling, fishing, golf, and others including ball games. Each sports group presented differences in demographics, sports motivation factors, and benefit factors. Four segments were identified based on sports participation motivation: active group, social group, health and revitalization group, and inactive group. The active group considered three clothing benefits and 14 evaluative criteria as being the most important among the four segments, indicating the major target market for outdoor sportswear brands. On the other hand, the members of inactive group showed passive attitudes toward clothing purchasing behaviors. This study discusses the results of this research within the context of the managerial implication for outdoor sports marketers.