• International Journal of Advanced Culture Technology
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• v.8 no.3
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• pp.206-210
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• 2020

The purpose of this study is to find out the specific needs of 1st graders for parents and homeroom teachers. The research questions of this study are as follows. Research question 1. What does 1st grader want from parents? Research question 2. What does the 1st grader want for the homeroom teacher? There were 31 participants. Data collection was conducted by focus group interview. Requests for parents are summarized as 'what 1st graders want from parents', and requests for teachers are summarized as 'what 1st graders want from homeroom teacher'. As the detailed topics of 'What 1st graders want from parents' are 'I have too much work to do, so I want to reduce it', 'Don't just scold me' 'Like in kindergarten, play with me' and 'I'm so hard. Take care of me'. As the detailed topics of 'what 1^st graders want from homeroom teacher.' are 'At first it was exciting', 'Scary teacher, I hate it', 'Friendly teacher, good', 'Teacher, please praise me' and 'Teacher, please teach me fun'. We revealed that the emotional support of parents and homeroom teachers is important for 1st graders to successfully adapt to elementary school.

• Tunnel and Underground Space
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• v.32 no.5
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• pp.298-311
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• 2022

Some problems, such as aging workers, a decreased population due to a low birth rate, and shortage of skilled workers, are rising in construction sites. Therefore research for smart construction technology that can be improved for productivity, safety, and quality has been recently developed with government support by replacing traditional construction technology with advanced digital technology. In particular, the motor grader that mainly performs road surface flattening is a construction machine that requires the application of automation technology for repetitive construction. It is predicted that the construction period will be shortened if the construction automation technology such as trajectory tracking, automation work, and remote control technology is applied. In this study, we introduce the hardware and software architecture of the smart motor grader to apply unmanned and automation technology and then analyze the traditional earthwork method of the motor grader. We suggested the application plans for the path pattern and blade control method of the smart motor grader based on this. In addition, we verified the performance of waypoint-based path-following depending on scenarios and the blade control's performance through tests.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2000.07a
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• pp.236-242
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• 2000

• The Mathematical Education
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• v.46 no.2 s.117
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• pp.155-171
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• 2007

One second grader, Junsu, was observed 4 times before and after formal multiplication lesson in Grade 2. This study describes how solution strategies in multiplication problems develop over time and investigates awareness of the relation between situation and computation in simple measurement and partitive division problems as informally experienced. It was found that Junsu used additive calculation for small-number multiplication problems but could not solve large-number multiplication problems and that he did not have concept of mathematical terms at first interview stage. After formal teaching, Junsu learned a variety of multiplication solution strategies and transferred from additive calculation to multiplicative calculation. The cognitive processing load of each strategy was gradually reduced. Junsu experienced measurement division as a dealing strategy and partitive division as a estimate-adjust strategy dealing more than one object in the first round.

• Proceedings of the Korean Society of Computer Information Conference
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• 2008.06a
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• pp.237-241
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• 2008

현재 글로벌화에 따른 과일 소비성향이 다종화, 고급화를 추구하고 있으며 국내 생산과일의 생존은 고급화에 의한 맛에 대한 경쟁력 재고가 필요하다. 과일을 맛과 크기에 따라 등급을 세분화 한 차별화된 마케팅이 요구되므로 수익과 생산성 증대를 위하여 개별농가에서의 대략적, 영세적인 선별에서부터 탈피한 체계적이고 규모화된 자동화 생산과정이 필요하다. 그러나 현재 사용되고 있는 선과기는 회전 드럼식 방식으로 크기 등급을 선별할 때 과실의 손상을 야기하고 당도측정을 위해 사용되는 광센서는 1억원에 달하는 선별장비 비용을 초래하므로 본 논문에서는 디지털이미지를 이용하여 과일의 크기를 측정하여 등급을판정하고 당도 측정 또한 과실의 파손없이 분류하는 과일 선별 시스템을 제작한다.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2001.07a
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• pp.232-238
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• 2001

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2000.02a
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• pp.436-444
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• 2000

• Journal of Korean Elementary Science Education
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• v.31 no.3
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• pp.321-333
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• 2012

The purpose of this study was to examine elementary school students' characteristics and difficulties in drawing and interpreting a line graph, and to present educational implications. Twenty five students(4th grader: 6, 5th grader: 9, and 6th grader: 10) at an elementary school participated in this study. We used a student's task which was about graphing on a given data table and interpreting his/her graph. The data table was on heating 200mL and 500mL of water and measuring their temperature at regular time intervals. We collected multiple source of data, and data analyzed based on the sub-variables of TOGS. The some results of this study are as follows: First, five children (20.0%), especially two of 10 sixth graders (20.0%), could not construct a line graph about a given data table. Second, twenty students (80.0%) had the ability on 'Scaling axes' and on 'Assigning variables to the axes', however, only a student understood why the time is on the longitudinal axis and the temperature is on the vertical axis. Third, in the case of 'Plotting points', twelve children (48.0%) could drew two graphs on a coordinate. Fourth, in the case of 'Selecting the corresponding value for Y (or X)', twenty student had little difficulty. on 'Describing the relationship between variables', seventeen students (68.0%) understood the relationship between time and temperature of water, and the relationship between temperature and amount of water. Finally, eleven students (44%) had the ability on 'Interrelating and extrapolation graphs.' Educational implications are also presented in this paper.

• Journal of The Korean Association For Science Education
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• v.15 no.3
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• pp.250-262
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• 1995

Investigation on the appendices was carried out to acquire teaching materials about improvement of a appendices and development of teaching-learning activities for science textbooks in Korean middle schools. We analysed the appendices for 30 kinds of science textbooks used in Korean middle schools during $1969{\sim}1994$ years. In the results there were three kinds of pattern for the appendices, such as appendix, non-appendix, and similar appendix without appendix title. The content of appendices were summarized as six categories. such as list of science and scientist history, SI unit-constants and symbols, handling methods of instruments for basic experiments, measuring methods and inquiry activity, safety and precautions, and supplementary data with figures and tables. The appendices of six categories were mostly a content of general and integrated science, and were concentrated in the first grader's textbooks. There were many appendices about the methods for basic experiments such as 'How to Use of Experimental Appliances' in the first grader's science textbooks, but there was no or lack of them in the second and the third grader's science textbooks in the middle school. By the ratio to the pages of appendices which were included according to curriculum changes. the ratio was found to be 4.47% which was the highest in middle school science textbooks at the second curriculum and to be 3.47% which was the highest in high school biology textbooks at the second curriculum. The results of this study indicated that the science textbooks should include as many appendices as possible, because teachers could utilize them in teaching activities and students should be able to be given much help in self-learning.

• Journal of Biosystems Engineering
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• v.20 no.1
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• pp.95-103
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• 1995

A series of study has been conducted to develop a multi-purpose fruit grader using a black ＆ white image processing system equipped with a 550 nm interference filter. A device and high performance algorithms were developed for sizing and color grading of Fuji apple in the previous study. In this study an emphasis was put on finding correlations between weights of several kinds of fruits and their area fractions(AF), and on compensating the blurring effect upon sizing and color grading by conveying speed of fruit. Also, the effect of orientation and direction of fruit on conveyor during image forming was analyzed to identify any difficulty (or utilizing an automatic fruit feeder. The results are summarized as follows. 1. The correlation coefficients(r) between the weights of fruits and their image sizes were 0.984~0.996 for apples, 0.983~0.990 for peachs, 0.995 for tomato, 0.986 for sweet persimmon and 0.970~0.993 for pears. 2. It was possible to grade fruits by color with the area weighted mean gray values(AWMGV) based on the mean gray valves of direct image and the compensated values of reflected image of a fruit, and also possible to sort fruits by size with AF. Accuracies in sizing and color grading ranged over 81.0% ~95.0% and 82.0% ~89.7% respectively as compared with results from sizing by electronic weight scale and grading by expert. 3. The blurring effect on the sizing and color grading depending on conveying speed was identified and regression equations were derived. 4. It was found that errors in sizing and coloring grading due to the change in direction and orientation of Fuji apple on the conveyor were not significant as far as the stem end of apple keeping upward.