• 컴퓨터교육학회논문지
• /
• 제7권3호
• /
• pp.1-14
• /
• 2004

언제 어디서나 적은 비용으로 프로그래밍을 배우고자 하는 수요가 늘어남에 따라 웹 기반의 프로그래밍 강의가 많이 이루어지고 있다. 일반적으로 웹 기반으로 프로그래밍을 가르치는 것은 매우 어렵다. 따라서 이 강의를 효과적으로 가르치기 위한 방법들에 대한 연구가 필요하다. 본 논문은 관련 문헌들과 수년 간에 걸쳐 웹 기반으로 프로그래밍 과목을 가르친 경험에 기초하여 효과적인 웹 기반의 프로그래밍 강의 전략을 제시한다. 먼저 프로그래밍 교과목의 특성과 학습자들의 특징을 고려하고 프로그래밍 능력을 개발하기 위한 교안 설계 전략을 제시한다. 다음으로 그 과목의 효과적인 평가 및 운영 전략을 제시한다. 마지막으로 제안된 전략들에 따라 진행된 최근 강의의 성적 평가와 운영 결과를 분석한다. 이는 웹 기반 강의의 교육 효과를 높일 수 있음을 보여 준다.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제11권1호
• /
• pp.374-395
• /
• 2017

Users quite often experience volatile channel conditions which negatively influence multimedia transmission. HTTP adaptive streaming has emerged as a new promising technology where the video quality can be adjusted to variable network conditions. Nevertheless, the new technology does not remain without drawbacks. As it has been observed, multiple video players sharing the same network link have often problems with achieving good efficiency and stability of play-out due to a mutual interference and competition among video players. Our investigation indicates that there may be another cause for under-performance of the streamed video. In an emulated environment, we implemented three algorithms of adaptive video play-out based on bandwidth or buffer assessment. As we show, traffic generated by players employing the same or similar play-out strategies is positively correlated and synchronised (clustered), whereas traffic originated from different play-out strategies shows negative or no correlations. However, when some of the parameters of the play-out strategies are randomised, the correlation and synchronisation diminish what has a positive impact on the smoothness of the traffic and on the video quality perceived by end users. Our research shows that non-correlated traffic flows generated by play-out strategies improve efficiency and stability of streamed adaptive video.

• 한국과학교육학회지
• /
• 제35권3호
• /
• pp.465-475
• /
• 2015

본 연구의 목적은 과학과 국가수준 학업성취도 평가에서 물리의 광학 영역 문항의 평가 결과를 분석하고 답지 반응률 분포 곡선을 활용하여 중학생들의 반응 특성을 분석하는 것이다. 이를 위해서 2010년부터 2013년까지 중학생들을 대상으로 시행된 과학과 국가수준 학업성취도 평가의 물리 문항 중 광학 영역에 해당되는 10개 문항을 분석하였다. 분석 결과는 다음과 같다. 첫째, 학생들의 '광학' 영역의 성취수준은 다른 영역(역학, 전자기학)에 비해서는 높았다. 둘째, '빛' 영역에서 '상의 형성'과 관련되어 학생들이 낮은 성취수준을 보였으며, '파동' 영역에서는 '파동의 전파에서 위상의 변화'와 관련되어 낮은 성취수준을 나타내었다. 셋째, 학생들은 상황 의존적인 문제풀이 전략 및 결과를 보이고 있었다. 연구 결과를 바탕으로 광학 개념에 대한 교육과정 수준의 재검토, 기초학력 단계 학생들에 대한 추가적인 교수학습의 필요성, 실제적인 현상 및 상황 중심의 교수학습의 필요성 등의 제언을 논의하였다.

• 한국안전학회지
• /
• 제38권3호
• /
• pp.102-109
• /
• 2023

Following the accident at Fukushima, the true impact of multi-unit accidents came to light. Accordingly, research related to multi-unit accident effect analysis, risk evaluation, and accident prevention/prevention technology has been conducted. Specific examples are mobile/fixed equipment such as multi-barrier accident coping strategy (MACST) and diverse and flexible coping strategies (FLEX), which have been introduced and installed in multi-units for preventing and mitigating multi-unit accidents. These strategies are useful for enhancing the safety of nuclear power plants (NPPs); however, a more efficient strategy is required in terms of the costs of physical and human resources. To effectively and efficiently mitigate an increase in multi-unit accidents, it is necessary to not only to utilize mobile/fixed equipment but to also use crosstie options with resources that already exist at NPPs. Therefore, we analyzed the current international and domestic status of crosstie systems technology and propose a method to evaluate feasibility alongside risk based on a multi-unit probabilistic safety assessment (PSA). To analyze the international and domestic status of crosstie systems technology, actual cases and related research were studied, and a list of potential crosstie safety resources was derived. Additionally, a case study was performed on crosstie cases of two systems within the assumed six units on-site under a multi-unit accident, and a multi-unit PSA-based risk evaluation method is proposed.

• 한국안전학회지
• /
• 제29권5호
• /
• pp.160-165
• /
• 2014

The realistic cases causing severe core damage should be analyzed and arranged systematically for preparing an accident management of the specific nuclear power plant. The objective of this paper is to establish basic technical information for reactor safety and reactor building integrity management strategies in CANDU reactor severe accident. For the development of severe accident management strategies, plant specific features and behaviors must be studied by detailed analysis works. This analysis scope will serve to cover overall methods and analyzing results to understand the reactor building integrity status in the most likely severe accident sequences that could occur at CANDU reactor. Also analysis results could help prevent or mitigate severe accidents for the identification of any plant specific vulnerabilities to severe accidents using the probabilistic safety assessment (PSA) quantified results.

• 한국초등과학교육학회지:초등과학교육
• /
• 제25권2호
• /
• pp.191-205
• /
• 2006

The purpose of this study was to explore strategies used by pre-service elementary science teachers in planning a science lesson. The participants were six senior students from a national university of education located in the midwestern area of Korea. Data regarding their planning strategies were gathered through both thinking-aloud and observation. Research findings suggest that: three of the teachers had little understanding of the necessity of reviewing unit contents or prior learning for planning a science lesson; five student teachers relied heavily on learning objectives presented in teachers' guidebooks without considering their appropriateness; all teachers exhibited an intention of composing different activities or teaching approaches from teachers' guidebooks; only two teachers thought about learners' prior knowledge or understanding levels; five and three teachers had poor understanding of discovery learning models and importance of teacher's questioning, respectively; and five teachers paid little attention to assessment.

• 한국수학교육학회지시리즈A:수학교육
• /
• 제40권2호
• /
• pp.253-263
• /
• 2001

Developing mathematical thinking skills is one of the most important goals of school mathematics. In particular, recent performance based on assessment has focused on the teaching and learning environment in school, emphasizing student's self construction of their learning and its process. Because of this reason, people related to mathematics education including math teachers are taught to recognize the fact that the degree of students'acquisition of mathematical thinking skills and strategies(for example, inductive and deductive thinking, critical thinking, creative thinking) should be estimated formally in math class. However, due to the lack of an evaluation tool for estimating the degree of their thinking skills, efforts at evaluating student's degree of mathematics thinking skills and strategy acquisition failed. Therefore, in this paper, mathematical thinking was studied, and using the results of study as the fundamental basis, mathematical thinking process model was developed according to three types of mathematical thinking - fundamental thinking skill, developing thinking skill, and advanced thinking strategies. Finally, based on the model, evaluation factors related to essential thinking skills such as analogy, deductive thinking, generalization, creative thinking requested in the situation of solving mathematical problems were developed.

• 한국수학교육학회지시리즈E:수학교육논문집
• /
• 제25권2호
• /
• pp.431-450
• /
• 2011

효과적인 수학 교수 학습 방안의 하나로 형성평가에 주목하였으나 수업에서 형성평가를 실시하고 그에 따른 피드백을 주는 일련의 과정을 체계적으로 다루는 연구는 부족한 것으로 보인다. 이에 본 연구에서는 CRESST 형성평가 프로그램을 하나의 모형으로 채택한 후 우리나라 실정에 맞게 수정하여 중학교 1학년 수준별 수업에 적용함으로써 수준별 수업에 따른 CRESST 형성평가 프로그램의 효과를 분석하였다. 또한 그 결과를 바탕으로 수학 교수 학습 방안을 개선하기 위한 교육적 논의와 시사점을 도출하였다.

• Journal of Community Nutrition
• /
• 제2권1호
• /
• pp.36-49
• /
• 2000

Evaluation of nutritional status is an essential element in providing appropriate intervention strategies to achieve the highest level of health, Nutritional assessment of the older population is complicated by many factors which do not significantly affect the nutritional status in young adults, therefore, it should be considered in two ways; community-dwelling elders group and hospitalized or institutionalized elderly group. To sort out the individuals with nutritional problems in a community efficiently, nutrition screening tools must be simple, relatively inexpensive, and applicable to a large number of subjects. Combination of tools and indicators such as 24-hour food recall, body weight and height, and questionnaires on eating practices, and the presence of chronic diseases is practically applicable as basic tools of nutritional screening of older age group. However, the lack of validated screening techniques remains a barrier in improving nutrition. Validation is only limited to energy, BMI, protein intake of the older populations living in western countries. Further refinement of nutritional assessment tools is demanded to figure out whether those are practically applicable to community-living older adults in Asian Society. A careful and systematic evaluation of nutritional assessment tools should be carried out prior to implementation of stepwise nutrition service to the heterogeneous older population. For an in-depth nutritional assessment at the individual level, we need to extend research efforts to clarify the requirements of nutrients due to aging and diseases. More cost-effective method that will allow rapid analysis of survey results are needed so that information can be readily available to policymakers.

• 농촌계획
• /
• 제18권3호
• /
• pp.43-55
• /
• 2012

This study proposes a self-assessment model and its implementing procedure for the local industry promotion project, the purpose of which is to develop strategies for successful carrying-out of the project by diagnosing carrying capacities of its interested parties. The model, developed principally based on Eckes' $Q{\times}A=E$ Evaluation Model, was applied to 85 project-concerned persons which had been participated in the local industry promotion project from 2009 to 2011. Through the applicability test works of this model, its usefulness and importance for better implementation of the project was ascertained, especially to reflect cultural changes of project actors positively. The actors' recognition level of the project should be one of the critical factors for the successful implementation of the local industry promotion project. So, the higher understanding in the local industry promotion project, the more positive assessment in all respects of the project. Finally, it should be considered that the assessment results might differ for the same assessment standards from assessers' different perspectives.