• Journal of Korean Medical Science
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• v.33 no.43
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• pp.239.1-239.12
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• 2018

Background: We described a novel multi-step retinal fundus image reading system for providing high-quality large data for machine learning algorithms, and assessed the grader variability in the large-scale dataset generated with this system. Methods: A 5-step retinal fundus image reading tool was developed that rates image quality, presence of abnormality, findings with location information, diagnoses, and clinical significance. Each image was evaluated by 3 different graders. Agreements among graders for each decision were evaluated. Results: The 234,242 readings of 79,458 images were collected from 55 licensed ophthalmologists during 6 months. The 34,364 images were graded as abnormal by at-least one rater. Of these, all three raters agreed in 46.6% in abnormality, while 69.9% of the images were rated as abnormal by two or more raters. Agreement rate of at-least two raters on a certain finding was 26.7%-65.2%, and complete agreement rate of all-three raters was 5.7%-43.3%. As for diagnoses, agreement of at-least two raters was 35.6%-65.6%, and complete agreement rate was 11.0%-40.0%. Agreement of findings and diagnoses were higher when restricted to images with prior complete agreement on abnormality. Retinal/glaucoma specialists showed higher agreements on findings and diagnoses of their corresponding subspecialties. Conclusion: This novel reading tool for retinal fundus images generated a large-scale dataset with high level of information, which can be utilized in future development of machine learning-based algorithms for automated identification of abnormal conditions and clinical decision supporting system. These results emphasize the importance of addressing grader variability in algorithm developments.

• Journal of Korean Tunnelling and Underground Space Association
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• v.23 no.6
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• pp.423-438
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• 2021

The blade of motor grader is used for scattering and leveling the aggregates on the foundation of road construction site. The paper performed a design improvement research of the blade part to enhance the working efficiency of motor graders. The scattering works of aggregates by blade driving were simulated by DEM (discrete element method) of a dynamic code. The four design parameters were selected and a specific leveling scenario for the simulation was determined. The nine blade models were numerically experimented, and the sensitivity of each factors was analyzed. Next, the design factors that influence a blade performance have been selected by ANOVA, and these key design factors were applied to the progressive quadratic response surface method (PQRSM). The optimum set of design factors of the blade was finally proposed.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• v.10 no.1
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• pp.281-285
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• 2005

• The Mathematical Education
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• v.55 no.4
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• pp.447-465
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• 2016

The purpose of this study is to analyze longitudinal trends of students' mathematical affective domain by use of the data mining method. For this purpose, we used the Korea education longitudinal study(KELS 2005) which was the survey data for students' achievement test, affective domain test, teachers' evaluation, and parents' evaluation from $7^{th}$ grader in the year of 2005 to $11^{th}$ grader in the year of 2010. Subjects of this study is a total of 5040 students who answered to the mathematical affective domain survey in KELS 2005. The result findings are as follows. First, students' affective domain had changed negatively as they went up to higher grade. Second, if students' affective domain had built at a certain level in $7^{th}$ grade, the level did not change easily until $11^{th}$ grade. Third, major factors of students' affective domain were shown to be self-efficacy, intrinsic motivation, efforts and patient, and time management.

• Journal of Biosystems Engineering
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• v.30 no.3 s.110
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• pp.172-178
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• 2005

Grading and sorting an indeterminate form of agricultural products such as sweet potatoes and potatoes are a labor intensive job because its shape and size are various and complicate. It costs a great deal to sort sweet potato in an indeterminate forms. There is a great need for an automatic grader fur the potatoes. Machine vision is the promising solution for this purpose. The optical indices for qualifying weight and appearance quality such as shape, color, defects, etc. were obtained and an on-line sorting system was developed. The results are summarized as follows. Sorting system combined with an on-line inspection device was composed of 5 sections, human inspection, feeding, illumination chamber, image processing & control, and grading & discharging. The algorithms to compute geometrical parameters related to the external guality were developed and implemented for sorting the deformed sweet potatoes. Grading accuracy by image processing was $96.4\%$ and the processing capacity was 10,800 pieces per hour.

• Korean Journal of Health Education and Promotion
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• v.1 no.1
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• pp.12-20
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• 1983

Primary responsibility for the health of the school-age child rests with the parents, but the school should assist the parents in establishing and maintaining the highest possible level of health in each child. The important part of school health program is health education. All kinds of testbooks for elementary school were newly developed from 1982 for the 1st to 3rd grader and from 1983 for the 4th to 6th grader. The purposes of this study were to analyse the newly developed health curriculum in elementary school and to point out the errors in contents or terminology. Data were collected from all kinds of textbooks for elementary school which have been using in 1983. On the bases of these data, the following findings were observed: 1) 22.4 percents of total pages which related to health were from athletic subject. 2) Almost 29 percents of learning experiences suggested from textbooks were explanation and teach-centered. 3) The main subjects of health related contents were preventional management and environmental health. 4) 22 errors were found out, they were 12 for contents itself correction, 6 for terminology correction, 3 for lack of explanation and 1 for expurgation.

• Journal of The Korean Association For Science Education
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• v.24 no.1
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• pp.146-156
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• 2004

The purpose of this study is to look at the use of heuristics when a sixth grader solves a problem. Two research questions have been formulated: The similarities and differences in the use of heuristics when a student solves two problems that are science-knowledge-based and not science-knowledge-based, and the different types of prompts. A male sixth grade student participated in this study. All of the information for the study was collected in three interviews. The interviews began with observing the student's solving problems. The student was asked how and why he solved problem that way. There were some interactions between the researcher and the student during the interview procedures. As results of this study, eight general heuristics were used in both solutions: Check examples for support of an idea: check examples for exceptions to an idea: restate the problem: compare to known examples or patterns: make a hypothesis; check the relevance of other information present; use analogy: and recognize patterns/similarity. There seemed to be more similarities than differences in the type of general heuristic that were used in the two problem solutions. The student was systematic and consistent in his use of the general use of heuristics. Five types of interviewer prompts were detected in the two problem solutions, directional cues, modeling, clarity, problem posing, metacognition and validation.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.20 no.1
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• pp.88-94
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• 2021

Currently, the Busan cooperative fish market follows a traditional market style. This study first investigates the current conditions and environment of the market, and to modernize the market, it proposes a new automatic unloading system based on the benchmark of Namhae Suhyup. In this system, a Korean-type suction fish vacuum pump is employed to increase the loading time. An automatic grader with an adjusting device for inclined angles and a weighing machine with an automatic alignment device are proposed. In addition, a folding machine is employed to prepare boxes. The specifications for each subsystem are provided. By implementing this system, the freshness of fish can be maintained and the sellers can earn more. This system can also be applied to the cooling system of the fish reservoir of littoral sea fishing boats.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.04a
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• pp.405-406
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• 2017

Everycoding은 인텔리전트 코딩 교육 시스템으로, 코딩 교육을 위한 다양한 콘텐츠 및 코딩 보조 도구를 제공한다. 특히, 코드 자동 평가 기능을 교육적 목적으로 활용함으로써, 비전공자들이 쉽게 코딩을 익힐 수 있게 도움을 주고 있다. 본 논문에서는 Everycoding에서 제공하는 코드 자동 평가 기능에 대하여 소개한다.

• The Journal of the Korea Contents Association
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• v.14 no.8
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• pp.185-196
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• 2014

This study aimed to exam the mediating effects of relational factors between family deficiency and community spirit in adolescence. Relation factors were composed of some factors, parents relation, peer relation, teacher relation, neighbor relation. Using samples from Korean Youth Panel Study(KYPS) 2012, authors analyzed 4,362, 6th grader and 9th grader, with a hierarchical regression to answer research questions proposed by the study. Results showed that the level of community spirit vary with significant in gender, age, health, family deficiency. Among control factors, girls, grade, recognition of health, earning affected the community spirit. In the relationship between family deficiency and community spirit in adolescence was proven to be influential. In conclusion, the researcher's hypothesized research model between relational factors and community spirit was proved to be true. Therefore this study suggested that adolescents in family deficiency were needed to be boosted a many relational factors. Finally, it remarked the limits of the study and the suggestions for the further research direction.