• Journal of Elementary Mathematics Education in Korea
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• v.21 no.2
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• pp.309-341
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• 2017

This study aims to investigate an approach to teach percentages in elementary mathematics class by analyzing calculating strategies with percentage the students use to solve the percentage tasks and their percentages of correct answers, as well as types of errors with percentages the students make. For this research 182 sixth graders were examined. The instrument test consists of various task types in reference to the previous study; the percentages tasks are divided into algebraic-geometric, part whole-comparison-change and find part-find whole-find percentage tasks. According to the analysis of this study, percentages of correct answers of students with percentage tasks were lower than we expected, approximately 50%. Comparing the percentages of correct answers according to the task types, the part-whole tasks are higher than the comparison and change tasks, the geometric tasks are approximately equal to the algebraic tasks, and the find percentage tasks are higher than the find whole and find part tasks. As to the strategies that students employed, the percentage of using the formal strategy is not much higher than that of using the informal strategy, even after learning the formal strategy. As an insightful approach for teaching percentages, based on the study results, it is suggested to reinforce the meaning of percentage, include various types of the comparison and change tasks, emphasize the informal strategy explicitly using models prior to the formal strategy, and understand the relations among part, whole and percentage throughly in various percentage situations before calculating.

• Journal of The Korean Association of Information Education
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• v.20 no.6
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• pp.629-644
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• 2016

The purpose of this study was to investigate the effects of whole-task sequencing emphasis manipulation on expertise acquisition in web based complex task. To achieve the purpose, emphasis manipulation sequencing type is composed of a simple emphasis manipulation, a snowballing manipulation, and a full emphasis manipulation sequencing and participants was drawn from a pool of 93 undergraduate students sampled for the study. According to the findings, a snowballing manipulation group invested significantly lower cognitive load than a full emphasis manipulation group but did not a simple emphasis manipulation group. Based on these findings, though complex task is included of high interactivity owing to real task, learner cannot suffer cognitive overload because emphasis manipulation which can view the whole task and the part task in parallel provides meta cognition for learner. And whole-task sequencing emphasis manipulation affects to transfer. The snowballing emphasis manipulation group invested significantly higher than simple emphasis manipulation group and full emphasis manipulation group. Based on these findings, the snowballing manipulation which learner use whole-task sequencing and part-task sequencing simultaneously contribute to understandings and ability to solve problems for complex task and it will in turn, lead to expertise acquisition.

• Korean Journal of Cognitive Science
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• v.18 no.4
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• pp.371-398
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• 2007

This study examined effects of word frequency and semantic transparency on decomposition processes of compound nouns by semantic priming task and repetition priming task. In Experiment 1, it was investigated that decomposition process depended on word frequency of compound noun. Semantic priming effects were found In the compound noun's associate rendition consistently, and repetition priming effects were found in the whole rendition as well as in the part condition irrespective of word frequency and SOA. These results implied that compound noun was processed through decomposition process path and direct access path. In Experiment 2, Effects of semantic transparency on decomposition processes of compound nouns were examined. Semantic priming effects were found when compound nouns' associates were presented as primes irrespective of semantic transparency and SOA, and results were the same as experiment 1b in repetition priming task. Results of experiment 1 and 2 implies that compound nouns are interpreted by interactive activation processes of attributes activated by decomposition path and direct access path.

• Journal of the Korean Society for Precision Engineering
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• v.13 no.7
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• pp.9-23
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• 1996

공작기계의 성능을 평가하는 방법에는 제안자 연구소 또는 규격제정기관에 따라서 여러가지가 있다. 우선 학술 적으로 볼 때 Fig.16-1에서 보는 바와 같이 Tlusty교수가 제안한 것을 보면 광범위하고 철저한 21가지의 평가 기준을 볼 수 있다. 이와 같이 방대힌 실험을 한다는 것은 매우 어렵고 현실적으로 불가능하지만 각 부분마다 연구개발하는 데에는 절대 필요로 할 뿐만 아니라 공작기계 전체의 품질을 향샹시키기 위한 21가지의 실험이 상호관계를 가지고 있다. 또 여기 기술한 실험은 공작기계의 성능을 높이기 위해서 해야 할 연구과제이기도 하다. 수 없이 많이 쏟아져 나오고 있는 연구 과제와 그 결과를 보면 Tlusty교수가 제안한 실험과제의 일부 또는 거기에 관련된 것을 연구과제로 삼고 있는 것을 알 수 있다.

• JOURNAL OF ELECTRICAL WORLD
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• s.300
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• pp.78-83
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• 2001

미쓰비시電機가 제안하는 에너지솔루션은, 고객의 에너지절약, 코스트절약 및 환경개선의 파트너로서 현장에 밀착하여 에너지의 종합엔지니어링력(力)(에너지 발생$\cdot$공습$\cdot$이용기술)과 IT를 구사하여, 고객의 에너지와 관련된 여러 가지 과제(부분적인 과제에서 고객 전체의 에너지과제까지)에 대하여 에너지절약 컨설테이션, 설계시공, 설비리스, O&M, 에너지 공급, 에너지운용관리까지 폭넓게 고객과 함께 해결해 오고 있다. 그 일환으로서 동사는 마이크로 가스터빈의 코제너레이션 시스템''마이크로 에코터보 MTG-28''을 분산전원의 레퍼터리로서 제품화하고 동시에 분산전원에 의한 전$\cdot$열공급 서비스사업을 적극적으로 전개하고 있다. 동사는 Capstone사 제품인 28kW 마이크로 가스터빈을 이용하여 열이용을 포함한 코제너레이션 패키지를 개발하고 또한 고객의 큰 관심사항인 메인터넌스에 대해서도 24시간 원격감시하는 시스템을 실용화하여 애프터서비스 체제를 정비하고 있다.

• Journal of Elementary Mathematics Education in Korea
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• v.20 no.1
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• pp.71-104
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• 2016

The aim of this study is to look into the didactical background for teaching percent in elementary school mathematics and offer suggestions to improve teaching percent in the future. In order to attain these purposes, this study examined key ideas with respect to the didactical background on teaching percent through a theoretical consideration regarding various studies on percent. Based on such examination, this study compared and analyzed textbooks used in the United States, the United Kingdom, and South Korea. In the light of such theoretical consideration and analytical results, this study provided suggestions for improving teaching percent in elementary schools in Korea as follows: giving much weight on percent, emphasizing the concept of percent as a ratio, underlining the various kinds of change problems, emphasizing informal strategies of students before teaching the percent formula, and utilizing various models actively.

• KLA journal
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• v.17 no.3
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• pp.13-16
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• 1976

본 협회는 도서관 발전의 기본이 되는 도서관법의 개정을 적극 추진하여 그간 전문위원회에서 위촉한 특별 위원회에서 기초자료를 조사하여 지난 22차 정기총회에서 회원 여러분에게 개정 초안을 배부한 바 있습니다. 도서관법은 우리 도서관계의 큰 관심사인 동시에 반드시 개정되어야 하는 과제를 안고 있으므로 여기에 그 대강을 게재합니다. 다만 이번에 마련된 초안은 전체 도서관계의 의견이 반영된 것이 아니며 법 개정 기술상의 전문성이 결여된 부분이 상당히 있음을 미리 밝혀두며 아울러 회원 여러분의 고견을 참고 하겠아오니 많은 참여가 있기를 기대합니다.

• Journal of the KSME
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• v.33 no.1
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• pp.14-21
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• 1993

본 해설에서는 가정용 진공청소기에서 일반적으로 사용되는 진동 . 소음 측정기법과 진공청소 기의 저소음화를 위해 별도로 고안된 흡음방이 장착된 진공청소기에 대한 측정예를 소개하였다. 본 해설에서 다룬 흡음방은 일반적인 소음기의 원리를 응용한 장치로서 저소음화가 특히 요구 되는 가정용 진공청소기의 효과적인 차음장치로 사용가능함도 확인하였다. 추가적으로 진행될 과제는 흡기구에서 배기구에 이르는 진공청소기 본체 내부의 긴유로에 대한 개선과 흡음방 내에 부착되는 보다 우수한 흡음제의 개발, 진공청소기의 전 부분에 대한 기밀유지 등이 있을 수 있 으며, 위의 분야에 대한 추가적인 지식들이 보강된다면 흡음방의 효과를 보다 높일 수 있는 전체 시스템이 형성될 수 있을 것이다. 음 저감의 효과를 감안할 때 수용 가능한 정도라 판단된다.

• ICROS
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• v.3 no.4
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• pp.40-44
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• 1997

이 글에서는 국제적인 연구 개발 과제인 홀로닉 제조시스템에 대하여 개념, 목표와 현황과 HMS에서의 핵심 연구 내용을 기술하였다. 홀로닉 시스템의 개념은 소프트웨어 agent와 agent-based 시스템과 유사하다. 그러나, 가장 큰 차이점은 제조 공정을 조직화하여 표현하는 홀론과 홀론 조직은 부분과 전체의 관계를 더욱 잘 표시할 수 있다는 점이다. HMS 회원사에 의하여 개발되는 모델 시스템들을 통하여 HMS 개념의 중요성과 지능형 제조 시스템에 응용될 수 있다는 점이 확인될 수 있을 것이다.

• Journal of The Korean Association For Science Education
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• v.33 no.4
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• pp.778-793
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• 2013

The purpose of this study is to analyze observation characteristics through eye movement according to cognitive styles. To do this, we developed observation tasks that show the differences between wholistic cognitive style group and analytic cognitive style group, measured eye movement of university students with different cognitive styles after being given an observation task. The difference between two cognitive style groups is confirmed by analysing gathered statistics and visualization data. The findings of this study are as follows: First, to compare fixation time and frequency, we compared the average value of total time used in the observation task by the wholistic cognitive style group and analytic cognitive style group. The numbers of Fixation (total) and number of Fixations (30s), is based on the fact that the wholistic cognitive style group has more numbers of fixation (Total) and number of fixations (30s) means the wholistic cognitive style group can observe more points or overall features than the analytic cognitive style group, in contrast, the analytic cognitive style group tend to focus on a particular detail, and observe less numbers of points. Second, to compare observation object and area by cognitive style, the outcome of analysing visualization data shows that wholistic cognitive style group observes the surrounding environment of spider and web on a wider area, on the other hand, the analytic cognitive style group observes by focusing on the spider itself. Through the result of this study, there are differences in observation time, frequency, object, area, and ratio from the two cognitive styles. It also shows the reason why each student has varied outcome, from the difference of information following their cognitive styles, and the result of this study helps to figure out and give direction as to what observation fulfillment is more suitable for each student.