• Journal of the korean academy of Pediatric Dentistry
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• v.46 no.3
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• pp.301-309
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• 2019

This study was performed to determine the effectiveness of oral health education program with a home-using portable device according to the individual oral health status in children. 58 children who were 6 - 12 years old were included in this study. All subjects were affiliated to moderate or high caries risk group based on caries risk test. They were divided into 2 groups: (I) home-using portable device group (II) control group. Both groups were evaluated with simple plaque score (SPS) using camera type quantitative light-induced fluorescence device and educated with identical oral health education methods. Subjects in group I were demanded to use a home-using portable device. After 1 month, both groups were re-evaluated. Cariview score that can reflect the acidogenic potential of plaque bacteria was statistically reduced in both groups (p < 0.001). There was a statistically significant difference between two groups in the change of Cariview score (p = 0.022). In group I, the decrease was larger than that in group II. There was no statistically significant difference in the change of SPS (p = 0.937). Oral health education improved oral hygiene status in children. However, this study confirmed that it was much more effective to improve oral health status in children with a home-using portable device in their daily oral hygiene care.

• Journal of The Korean Association of Information Education
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• v.25 no.3
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• pp.557-569
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• 2021

In preparation for the future society, the educational curriculum is changing according to the trend of the times, and with the advent of the era of the 4th Industrial Revolution, the purpose of the new 2015 revised curriculum was suggested to foster the convergence creativity of students. The purpose of software education is to promote creativity and further develop problem-solving skills in connection with real life. In addition, flow in learning leads to outstanding educational achievement. However, in elementary school computer education, there is still a lack of development of a convergence class model for students to easily immerse themselves and promote creative problem-solving skills. Therefore, in this study, we designed convergence computer education using Novel Engineering, which is a convergence class model suitable for these educational conditions and applied it to classes. Further, to measure the effect on the improvement of learning flow and creative problem-solving ability. the Novel Engineering-based computer class was applied to the experimental group for 6th graders, and the general computer class was applied to the control group. As a result of the pre-post test between groups, it was found that computer classes using Novel Engineering had a positive effect on learning flow and creative problem-solving ability.

• Journal of Food Hygiene and Safety
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• v.36 no.1
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• pp.9-16
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• 2021

The monitoring of residual pesticides in dried chili peppers and chili powders, which are circulated in Seoul from 2018 to 2019, was conducted for safety evaluation. As a result of analyzing for 71 kinds of pesticide residues in 101 cases of samples, pesticides were detected in 87 samples; however, no samples exceeded the MRLs (Maximum Residue Limits). Detection rates of pesticides in dried chili peppers and chili powders were 73.3% and 91.5%, respectively. The detection rate of residual pesticides in chili powders was a little higher than that in dried chili peppers. Twelve types of pesticides were detected, however, those pesticides were acceptable to use on peppers, according to the Crop Protection Guidelines. The most frequently detected pesticide was pyraclostrobin followed by flubendiamide, azoxystrobin, and chlorantraniliprole. The risk for detected pesticides was estimated as the ratio of ADI (Acceptable Daily Intake) to food intake rate. The ADI value resulting by intake of dried chili peppers and chili powders was in the range of 5.66E-05 to 3.34E-02, which was within a safe level.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.1
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• pp.363-371
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• 2021

The goal of this study was to investigate the influence of exercise training with or without blood flow restriction (BFR) on physical performance and balance in elderly females. Participants (N = 43) were randomly divided into combined exercise with BFR group (n = 14, EX-BFR), only combine exercise group (n =14, EX) or a non-exercise control group (n = 15, CON). Both EX-BFR and EX groups had completed exercise training for 12 weeks. During the training period, the CON group maintained their normal lives. After baseline tests, two-way repeated measures ANOVA with contrast testing was conducted using SPSS 22.0. Study results found that physical performance and balance in both EX-BFR and EX groups were significantly improved, and fall index in both EX-BFR and EX groups were significantly decreased. There were no changes in the CON group. In addition, the % change and effect size of all variables in the EX-BFR group were larger than the EX group. So, the results showed that the EX-BFR group had performed more intense exercise caused by restricted blood flow during the training period compared to the EX group. Thus, exercise with BFR training may additionally influence physical performance and balance in elderly females.

• Journal of Navigation and Port Research
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• v.46 no.4
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• pp.338-343
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• 2022

As the revitalization of the global maritime industry continues, the number of foreign ships navigating the maritime territories of maritime neighboring countries has rapidly increased. However, large-scale marine accidents have occurred, caused by the insufficient establishment of a system for management and operation relative to vessels' safety-condition. To address that, the IMO has granted the right to exercise port state control, especially for foreign vessels, to countries with jurisdiction over maritime territories with strengthening regulations and guidelines. In particular, the Republic of Korea, as a member of the TOKYO MOU, is conducting PSC, but as of 2020, the proportion of foreign ships was three times higher than that of national ships that called in domestic ports. However, the inspection rate was low at 9% which has not met the recommended level by the TOKYO MOU. Thus, this study conducted an IPA analysis as well as content analysis, by collecting the practical opinions and views of PSCO through objective questionnaires and written expert interviews, for improving the efficiency and effectiveness of domestic PSC. As a result, it was derived that the importance and performance related to human factors such as life on board, working environment, and response to safety accidents should be improved in to raise the quality of PSC inspection. Additionally, the work environment and performance of PSC in domestic ports for foreign vessels could be improved, if multifaceted support bases are established, for administrative unification of related tests for PSC, recruitment of PSCO, activation of the defection-reporting system, reorganization of the PSC execution group, etc.

• KIPS Transactions on Software and Data Engineering
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• v.11 no.5
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• pp.211-220
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• 2022

Recently, research on smart factories triggered by the 4th industrial revolution is being actively conducted. Accordingly, the manufacturing industry is conducting various studies to improve productivity and quality based on deep learning technology with robust performance. This paper is a study on the method of detecting tire surface defects in the visual inspection stage of the tire manufacturing process, and introduces a tire surface defect detection method using a depth image acquired through a 3D camera. The tire surface depth image dealt with in this study has the problem of low contrast caused by the shallow depth of the tire surface and the difference in the reference depth value due to the data acquisition environment. And due to the nature of the manufacturing industry, algorithms with performance that can be processed in real time along with detection performance is required. Therefore, in this paper, we studied a method to normalize the depth image through relatively simple methods so that the tire surface defect detection algorithm does not consist of a complex algorithm pipeline. and conducted a comparative experiment between the general normalization method and the normalization method suggested in this paper using YOLO V3, which could satisfy both detection performance and speed. As a result of the experiment, it is confirmed that the normalization method proposed in this paper improved performance by about 7% based on mAP 0.5, and the method proposed in this paper is effective.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.40 no.6
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• pp.731-737
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• 1995

This experiment was carried out at National Crop Experiment Station in 1994 to obtain basic information of growth characters and yield of rice under various nitrogen split application methods on different soil textures in direct seeding on dry paddy. Hwaseongbyeo sown on April 27 by flat drill seeding, and irrigation was done at 3 leaf stage after seedling establishment. Number of seedling stand was 159~177 seedlings per $m^2$ regardless of soil texture and nitrogen application method. Number of panicle per unit area in loam was higher than in sandy loam, and it also was higher in top dressing plots, which were 3 times application at rate of 40-30-30% (3rd leaf stage -7th leaf stage -panicle initiation stage) and 4 times application 10-30-30-30%(basal-3rd leaf stage -7th leaf stage -panicle initiation stage), than in conventional method. Leaf colour, leaf area index and dry matter production at heading stage were highest at top dressing plots among the nitrogen application methods in both sandy loam and loam. Lodging index in top dressing plots increased by low breaking weight with long culm. There were field lodging of degree 3 in top dressing plots. Rice yield in sandy loam, loam increased by 7~9%, 6~9% in top dressing of nitrogen, respectively.

• Journal of Korea Entertainment Industry Association
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• v.13 no.6
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• pp.221-233
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• 2019

The purpose of this study tries to show the effectiveness of integrated theater education for low-grade students who lack social skills with the direction of art education based on 'theatrical and educational theater' and 'theater therapy' in the revised curriculum in 2015. To do this, the researcher organized a theater camp organized by the social, cultural and arts education institute in Seoul for a total of 12 low-grade elementary school students for four weeks, and had a presentation session. In addition, the researcher observed the behavioral changes of the participating children to verify the social development of the theater education and after the conclusion, the final results were obtained through the in-depth interviews of the participants' parents and teachers. As a result, it was found that Social Skills Rating System(SSRS)' test, teachers' observation logs, interviews, and responses of participating children, which are the main subjects of this activity, had a great effect on improving their sociality and relationship. Therefore, the researcher tried to prove through this paper that theater education is effective in enhancing social skills as creative, personality and convergence education in preparation for the 4th industrial era and that it is important to solve communication problems such as the absence of human relationships.

• Convergence Security Journal
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• v.22 no.3
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• pp.25-32
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• 2022

Recently, the image processing industry has been activated as deep learning-based technology is introduced in the image recognition and detection field. With the development of deep learning technology, learning model vulnerabilities for adversarial attacks continue to be reported. However, studies on countermeasures against poisoning attacks that inject malicious data during learning are insufficient. The conventional countermeasure against poisoning attacks has a limitation in that it is necessary to perform a separate detection and removal operation by examining the training data each time. Therefore, in this paper, we propose a technique for reducing the attack success rate by applying modifications to the training data and inference data without a separate detection and removal process for the poison data. The One-shot kill poison attack, a clean label poison attack proposed in previous studies, was used as an attack model. The attack performance was confirmed by dividing it into a general attacker and an intelligent attacker according to the attacker's attack strategy. According to the experimental results, when the proposed defense mechanism is applied, the attack success rate can be reduced by up to 65% compared to the conventional method.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2020.08a
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• pp.81-81
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• 2020

본 연구는 새싹인삼(Panax ginseng sprout) 재배용으로 이용하기 위한 묘삼(종삼)의 장기 저온저장 시 사용되는 필름의 종류가 묘삼의 출아율이나 생육에 영향을 미치는 지 조사하기 위해 수행되었다. 포장에 사용된 필름은 다공성물질인 제올라이트와 페그마타이트가 5% 함유된 50㎛ low density polyethylene(기능성 LDPE) 필름과 nylon/polyethylene 80 ㎛(Ny/PE) 필름에 묘삼을 100g씩 포장한 후 골판지 상자에 담아 -2℃의 저장고에서 10개월 동안 저장하면서 8개월째부터 2개월마다 시료를 꺼내어 5℃에서 5일 동안 온도 순화를 시킨 후 1차 조사에서는 육안조사로 실험실에서 건전한 묘삼과 부패 묘삼을 조사하였고, 건전한 묘삼만 새싹인삼 수경재배 농가에 재식한 후 2차 조사로 묘삼의 출아율과 출아된 묘삼이 새싹인삼으로 건전하게 생육한 비율을 조사하였다. 조사결과 Ny/PE 필름에 8개월 저장된 묘삼의 경우 1차 육안검사 시 뇌두부위가 검게 변하여 묘삼이 대부분 고사된 것으로 조사되었다. 필름 개봉 전 필름 내부의 O₂ 및 CO₂ 가스농도를 측정한 결과 O₂ 농도는 1.91%, CO₂ 농도는 38.9%로 측정되었고, 필름 개봉 시 알코올 냄새의 이취가 나는 것으로 보아 Ny/PE 필름으로 포장 된 묘삼이 -2℃의 저온저장기간 동안에도 호흡을 하면서 필름 내 산소를 완전히 소모하고 혐기적인 환경으로 변화시켜 대사활동이 불가능하였기 때문에 뇌두의 싹이 고사된 것으로 조사되었다. 반면 기능성 필름으로 포장한 묘삼은 저장 8개월에 정식 후 74.3%의 출아율을 보였고, 건전한 새싹인삼의 비율은 67.2%로 조사되었다. 정식 전·후 묘삼의 개체수 대비 건전 출아율의 비율은 56.7%를 나타내어 Ny/PE 필름으로 포장한 묘삼의 결과와 큰 차이를 보였다. 기능성필름의 개봉 전 필름 내부의 O₂ 및 CO₂ 가스농도를 측정한 결과 O₂ 농도는 12.9%, CO₂ 농도는 4.6%로 측정되어 묘삼의 저온저장 시 필름을 적용할 경우 공기의 유동이 원활이 이루어져 내부 O₂ 농도를 일정 수준 이상 유지해주는 필름을 사용하는 것이 묘삼의 출아와 생육에 좋은 것으로 조사되었다.