• Journal of Korean Society of Transportation
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• v.16 no.1
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• pp.7-24
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• 1998

1960년대 이후 경제규명의 괄목할 만한 성장과 생산규모가 확대되어 비용 최소화를 통한 물류분 야의 근대화가 핵심적인 문제로 대두됨에도 불구하고 체계적이며 효율적인 물류체계의 부재로 인한 물 류비의 상승은 산업경쟁력을 약화시켜 물가상승등의 경제불안을 초래하고 있다. 또 가중되는 도시내 교 통혼잡과 최근들어 시행되고 잇는 도시내 화물차량에 대한 각종 규제로 물류비중 수송비의 비증은 지속 적으로 증가되고 있는 실정이다. 이에 따라 사회적으로 물류비를 절감시킬수 있는 물류시설에 관한 관 심이 고조되고 있으며 국가나 지방자치 단체 차원에서도 지역간의 물류거점으로서의 유통단지나 복합화 물터미널 등에 대한 필요성이 강조되고 있는 실정이다. 그러나 이러한 지역간 물류거점으로서 체계뿐만 아니라 도시내에서의 물류활동 즉 도시내에 위치한 최종소비자를 대상으로한 수·배송은 도시교통문제 와 물류서비스를 최종적으로 실행과 직결되어 있다는 점에서 매우 중요한 의미를 갖는다. 따라서 본연 구에서는 도시내 물류거점 시설인 배송센타를 대상으로 배송센타 1일 가동시 총물류비용 모형을 도출하 여 1일 총물류비용을 최소화 할 수 있는 배송센터 최적수 결정 모의 실험 모형을 구성하였다. 이와 병 행하여 최근 들어 대형화물차량에 대한 도심진입규제 통행제한 등 각종 화물차량 규제로 인하여 배송행 태 변화에 따른 사례를 상정하여 민간 차원에서 규제후 변화된 물류비의 변화정도와 그비용을 감소시킬 수 있는 방안의 검토를 시행하였다.

• Journal of Science Education
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• v.37 no.1
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• pp.221-232
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• 2013

The purpose of this study was to examine the effect of the CoRe-based density unit class on conceptual formation and on learner satisfaction with the class. For this study, two hundred and forty 8th grade students were chosen from six classes. The students were divided into two groups: an experimental group, which received a CoRe-based density unit lesson, and a control group, which was taught based on traditional teaching method. The CoRe-based density unit classes consisted of 4 periods based on the analysis of the previous studies on CoRe about density. The results showed the meaningful significant difference between the CoRe-based classes and the classes based on traditional teaching method both in the posttest on the extent of the conceptual formation on the density and in the retention test. The difference suggests that the lesson with CoRe is based on the consideration of the difficulties and limitations students face in various fields such as the students themselves, teachers, learning environment, evaluation, etc. during their learning process and even in the types of preconception they have, and the CoRe-based lesson is centered around the best teaching strategies to solve such difficulties. As a result of the analysis on the experimental group's class satisfaction, it is revealed that the students with a high level of attitudes related science or with a high level of science achievement showed especially high satisfaction in their learning. Analysis of questionnaire survey showed that the students in the experimental group got the opportunity through CoRe-based lesson to stretch their thoughts and ideas in a free way and preferred a teaching method which didn't just show the concept, but allowed them to find it for themselves or which let them predict the solution and then confirm the result on their own and a lesson which encouraged their active participation.

• The Journal of the Korea Contents Association
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• v.20 no.1
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• pp.117-126
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• 2020

This study was conducted to explore the effect of the type of dashboard on online group discussion activities based on learning analysis. The experimental research was conducted among 51 learners from a university by dividing them into 2 groups. Group A provided participation and interaction dashboard, and group B provided the discussion topics and message type dashboard. First, pre-tests were conducted on attitudes toward computer writing and the level of motivation that could affect online discussion activities. Then the students participated three different topics of online group discussions. The participation and interaction data were automatically collected through the dashboard, and learning outcome data were collected through post-tests. The results showed level of participation in Group B (M=47.56, SD=2.37) that provided discussion topics and message type dashboard was significantly higher than the level of participation in Group A (M=38.13, SD=2.21) that provided participation and interaction dashboard. On the other hand, there were no differences in the level of interaction and learning outcomes. In future studies, we suggest that the dashboard effects based on the learners' characteristics should be carried out because the learners' characteristics may affect the use of the dashboard.

• Journal of the Korean earth science society
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• v.27 no.3
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• pp.260-268
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• 2006

Students' affective attitude not only influences their achievement in a meaningful way but is also an important educational goal in its own right. This research investigated how students' interest in science varies among elementary, middle, and high-school students based on surveys and reviews of previous research results. We analyzed students learning attitude in terms of (1) interest in and enjoyment of science, (2) instrumental motivation in science, (3) science learning anxiety, and (4) self-concept in science. Major findings are that students showed more negative attitudes in intrinsic motivation, instrumental motivation, value perception of science, and confidence in science as they move in to a higher school level. According to the students' explanation, science classes get boring in higher grades because of difficult contents, lack of experiments and activities, and the teachers' monotonous explanations. Based on the results, recommendations on how to improve students' attitudes towards science are suggested. First of all, we need to secure more science instructional hours in the school curriculum than the 7th national curriculum to implement improved science teaching and learning methods.

• Clean Technology
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• v.18 no.4
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• pp.347-354
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• 2012

In this study, simulation works have been performed for the $CO_2$ removal process contained in the DME production process using NMP (N-methyl-2-pyrrolidone) as a solvent. PRO/II with PROVISION release 9.1 at Invensys was used as a chemical process simulator and NRTL activity coefficient model with Henry's law option and Soave-Redlich-Kwong equation of state were used for thermodynamic models. For the determination of the binary interaction parameters in NRTL model, regression works have been performed to match the experimental thermodynamic data. Optimal feed tray location which minimizes the reboiler heat duty was determined.

• Journal of The Korean Association For Science Education
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• v.39 no.3
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• pp.389-403
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• 2019

This study aims to analyze criteria and characteristics for preservice elementary teachers' critiques of their peers' inquiry-based instruction. This study reviews critiques written by 31 preservice elementary teachers enrolled in an elementary school science inquiry methods course wherein the teachers designed and implemented inquiry-based instruction. These preservice teachers participated in inquiry-based instruction as if they were elementary students and then evaluated their peers' instruction. Analysis of the critiques reveals that preservice teachers evaluated their peers' instruction on the following criteria: instruction context, science content, teaching strategies, students, instructional goals, non-verbal attitude, and assessment. Their beliefs about teaching science inquiry were reflected in the critiques. Additionally, it was found that four orientation for teaching inquiry-didactic, academic rigor, activity-driven, inquiry orientation-reflected in critiques; some of critiques held more than one of these orientations. And they did not merely criticize but suggested alternatives to general teaching strategies; furthermore, of inquiry-instruction specific teaching strategies. They showed higher epistemic understanding of inquiry-based instruction after mid-term demonstrations. The evidence demonstrated that the proportion of critiques specifically about inquiry-based instruction increased after the mid-term demonstrations. Moreover, the post mid-term critiques emphasized interaction between students as well as understanding of the nature of science. These findings could provide implication for teaching inquiry and criticizing others' instruction as part of elementary school science courses in preservice elementary teacher education.

• Journal of the Korean School Mathematics Society
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• v.13 no.1
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• pp.163-184
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• 2010

In this paper, we study the effects on mathematical communication and disposition for the writing mathematics letters in secondary mathematics education. For this purpose we construct a experimental class and then analyse the students' change in those aspects after applying writing mathematics letters made some significant changes on the students communication in mathematics and disposition. First. the results for this purpose on regarding the enhancement of mathematical communication are effective. Second, the results on regarding the improvement of disposition are effective.

• Journal of Science Education
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• v.36 no.2
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• pp.198-215
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• 2012

Purpose of this study is to clarify the effect of creative science writing for interest of biology and scientific attitude on high school student. Creative science writing is a learning method to enhance comprehension and expression of thinking of science contents related to daily life. 148 students were recruited and divided into two groups, experimental group were experience creative science writing lessons. On the other hand, contrary group were applied interest enhancement lessons excepted creative science writing activity. To investigate the effect of creative science writing, interest check of biology was used, and scientific attitude test was used to understand changes in student's scientific attitude. Experimental group had taught using creative science writing and their awareness of the instruction was analyzed with questionnaire. As a result of this study, the class based on creative science writing was effective in improving high school students' interest in biology and in particular it was helpful in promoting interest in biology and learning of biology. It suggested that the class based on creative scientific writing used a new teaching method unlike existing methods, caused them to have interest in the instruction by making them express their daily life freely not to memorize learning contents, applied learning contents to daily life through many kinds of writings and then enhanced their interest in biology. Indeed, the class based on creative science writing had the positive influence on changes in the scientific attitude of high school students. Since creative science writing is writing one's own idea through extensive thinking based on learning contents, it was effective in arranging the process of thinking and changing their scientific attitude into positive one. Consequently, it was concluded from the above results of the research that the teaching using creative science writing was available as the effective teaching methods to improve high school students' interest in biology and change their scientific attitude into positive one.

• Journal of The Korean Association For Science Education
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• v.39 no.5
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• pp.625-635
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• 2019

Students are exposed to many visual representations in various visual cultures. Infographics combining visual representations and writing can effectively convey information. Also it can be efficient ways for teachers to focus on important contents. Students can use infographics as a method directly to organize information. Therefore, the infographics that students use both writings and images directly and visually will be more effective on elementary school science classes than the workbook. Classes are guided with the same scientific inquiry and experiment written on the science textbook. The experimental group students organized scientific inquiry by infographics, while the comparison group students still used the workbook. First, the types of infographics are determined by what students want to explain. Based on learning objectives, students used the right type of infographics to effectively convey their focus on information. Second, the infographics organizing activities used in the classes had a significant effect on students' academic achievement. Also, the infographics organizing classes are positively associated to science-related attitudes, including such+ as 'Leisure Interest in Science', 'Adoption of Scientific Attitudes', and 'Attitude to Scientific Inquiry'. Third, visual tendency and classroom treatments had no interactions, but the experimental group had a positive impact regardless of student's characteristics. Fourth, experimental group showed positive attitudes toward to students' perception of infographics. Since some of students had difficulties organizing information in infographics, further research is required to enable students to reduce their burden in application of infographics.

• Journal of Korean Elementary Science Education
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• v.40 no.4
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• pp.443-459
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• 2021

In this study, a TPACK-based STEAM program was developed and applied under the theme of excretory organs in the 'Structure and Function of Our Body' of the elementary science curriculum. The program was produced and conducted through curriculum analysis and learning goal detailing, learning environment analysis, teaching·learning method and technology selection, TPACK elements arrangement and teaching·learning material development, application and effectiveness verification. Teacher's TPACK considered in STEAM program design process is content knowledge (appearance and work of excretory organs), pedagogical knowledge (STEAM, problem-based learning, research learning, discussion learning, cooperative learning, scientific writing) and technology knowledge (3D printer and smart device application technology). The program consisted of a total of 8 hours of project learning activities and was applied to 29 students in the fifth grade as an experimental group. A program of the same theme developed mainly from textbooks was applied to 27 students in the fifth grade of a comparison group. As a result of the application of the program, the experimental group showed significant improvement in creative problem-solving ability and scientific attitude compared to the comparison group, and the class satisfaction with the STEAM program was also high. However, there was no significant difference in academic achievement ability.