• Proceedings of the Korea Information Processing Society Conference
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• 2023.11a
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• pp.902-903
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• 2023

장애물이나 경사지가 많은 협소 지역에서 탐사 활동을 수행하는 로봇은 험지에서도 이동할 수 있는 자율주행 방법을 필수적으로 제공해야 한다. 본 논문은 협소 지역에서 탐사와 객체 탐지를 위해 주행 상황에 따라 바퀴 주행과 관절 주행을 동적으로 변경하면서 이동하는 다관절 로봇 시스템을 제안한다. 다관절 로봇은 마찰력과 수직항력, 토크 값 등을 고려해 설계한 운동 모델을 기반으로 바퀴와 관절 이동을 변경하면서 자율적으로 주행한다. 관리자는 관제 서버를 통해 로봇이 수집한 탐사 정보를 실시간으로 확인하고 필요시 로봇의 원격제어를 수행할 수 있다. 본 연구를 통해 사람이 접근하기 어려운 협소 지역 탐사나 재난지역 인명구조 활동에 활용할 수 있기를 기대한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.11a
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• pp.1102-1103
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• 2023

안전모 착용 여부를 확인하는 객체 탐지 모델을 물류 현장에서 활용하기 위해서는 안전모를 착용한 경우와 착용하지 않은 경우를 정확하게 탐지해야 한다. 하지만 학습 데이터가 안전모를 착용한 클래스와 착용하지 않은 클래스 간 불균형이 존재하는 경우 해당 데이터만으로는 태스크에 맞게 학습이됐다고 보긴 힘들다. 본 연구는 데이터 증강 기법 적용 시 임의의 데이터에 증강을 적용하는 대신 상대적으로 적은 안전모를 착용하지 않은 클래스를 포함하는 이미지에 대하여 데이터 증강 기법을 적용하였다. 여러 데이터 증강 기법 중 Rotation, Gaussian Noise, 객체를 기준으로 한 Crop을 직접 구현 및 적용하여 객체 탐지 모델인 YOLOv5의 성능을 효과적으로 높이며 더욱 강건한 모델을 개발하는 방법을 제안한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2022.07a
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• pp.3-5
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• 2022

혼합 중요도(mixed criticality) 시스템은 안전에 중요한 기능을 우선시하도록 하는 추가적인 안전 요구사항이 존재한다. 그러나 기존 실시간 시스템의 설계로는 이를 만족하지 못하며, 높은 중요도 태스크가 다른 낮은 중요도 태스크로부터 간섭을 받아 데드라인 미스와 같은 문제를 일으키는 중요도 역전(criticality inversion) 문제가 발생할 수 있다. 이러한 중요도 역전 문제를 해결하기 위해 주기 변환(period transformation) 기법을 사용할 수 있지만, 스케줄링 오버헤드의 증가로 인해 오히려 전반적인 태스크의 응답시간이 증가하는 또 다른 문제가 발생하게 된다. 본 논문에서는 주기 변환과 스케줄링 오버헤드 간의 트레이드오프 관계를 설명하고, 실시간 리눅스 시스템에서 해당 문제점을 재연한 후 주기 변환의 적정선을 분석하고자 실험을 진행하였다. 그 결과, 중요도 역전 문제를 해결하기 위한 주기 변환을 그대로 적용할 경우, 문맥 교환이 48.7% 증가 및 스케줄링 오버헤드가 28.7% 증가로 인해 전반적인 응답시간이 증가하여 데드라인 미스가 다수 발생하는 결과를 확인할 수 있었다.

• Journal of the Korea Convergence Society
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• v.10 no.3
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• pp.115-125
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• 2019

This study aims to find ways to qualify lifelong education professionals for the disabled based on the convergence curriculum between the "department of vocational special education in university-educated graduate school" and "major department". The research method was composed of a combination of literature analysis and expert meetings. The research contents include the qualifications for the training course for the lifelong education professionals for the disabilities established in the convergence curriculum after accumulating the teaching experience in the majors that can be restructured as lifelong education institutions for the disabled. In addition, the focus of the curriculum of the "department of vocational special education in university-educated graduate school" should be improved in order to foster and integrate lifelong education professionals for the disabled. The results of the study concluded that the functional relationship between vocational special education and lifelong education for the disabled was established.

• Journal of the Korea Institute of Military Science and Technology
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• v.25 no.4
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• pp.364-371
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• 2022

Surface state change of ammunition generated during the storage period increases the surface roughness and this affects the flight of ammunition, but there are no research results quantitatively indicating this. In this study, the drag force for each Mach number of howitzer shells was calculated through CFD to which the surface data of the howitzer shell was applied, and analysis of trajectory was performed using drag force values as an input of the 4th Runge-Kutta method, and the degree of decrease of the maximum range caused by the surface roughness of the howitzer shell was estimated. As a result, it was confirmed that the maximum range of howitzer shell with high surface roughness was 1.12 % shorter than that of howitzer shell without roughness. It was confirmed that the effect of surface roughness on the trajectory is not negligible.

• Korean Journal of Environmental Agriculture
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• v.41 no.4
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• pp.252-260
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• 2022

BACKGROUND: The number of biomass power plants is increasing around the world and the amount of wastes from power plants is expected to increase. But the bottom ash (BA) is not recycled and has been dumped in landfill. This study was conducted to find out functional groups of BA and adsorption rate of heavy metals on BA. METHODS AND RESULTS: The BA was dried in oven at 105℃ for 24 hours, and characterized by analyzing the chemistry, functional group, and surface area. The adsorption rates of heavy metals on BA were evaluated by different concentration, time, and pH. As a result, the adsorption amount of the heavy metals was high in the order of Zn> Cu> Cd> Ni and the removal rates of Zn, Cu, Cd, and Ni by BA was 49.75, 30.20, 32.46, and 36.10%, respectively. Also, the maximum adsorption capacity of BA was different by the heavy metal in the environmental conditions, and it was suggested that the isotherms for Zn, Ni, Cd, and Cu were adequate to Langmuir model. CONCLUSION(S): It is suggested that it would be effective to remove heavy metals in aqueous solution by using BA from biomass power plants in South Korea.

• Human Ecology Research
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• v.62 no.2
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• pp.369-383
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• 2024

The aim of this study was to develop and implement a program based on Cognitive Behavior Therapy (CBT) for female college students experiencing body dissatisfaction. To systematize the program development process, we adopted the service design method. First, we conducted In-Depth Interviews (IDIs) to identify the difficulties faced by six female college students who experience body dissatisfaction, and to determine what kind of help they needed. Second, content analysis of the findings revealed that female college students were experiencing emotional-behavior problems which derived from the discrepancy between their ideal body image and the reality. Third, a prototype of a cognitive reconstruction program was developed to help transform their perceived 'body distortion' to a rational cognitive concept and thus reduce maladaptive consequences of 'body dissatisfaction'. The overall program consisted of three therapeutic components and seven steps. Fourth, to assess the effectiveness of the program, survey and IDIs were conducted. The results revealed that it is appropriate to use a cognitive model to solve problems caused by body dissatisfaction, and that understanding and reconstructing one's own cognitive processes can be effective in reducing body dissatisfaction. However, based on feedback from participants, a number of revisions were proposed, such as including sufficient induction regarding the behavioral change.

• Journal of the Korea Convergence Society
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• v.7 no.1
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• pp.145-153
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• 2016

The purpose of this study is to suggest a suitable learning style for 300 college students who are attending Duniversity in Jeonnam providence according to QSSC(Questionnaire of Sasang Contribution Classification), major and brain dominance after finding out the difference of learning style according to Sasang constitution and major and brain dominance according to major. First, Soyangin's learning style was found out extroversion -type, but soeumin's learning style was found out introvert type. There was difference on physical type on learning style according to major. Third, there were found difference for a few questionnaire of the dominance of brain. According to above findings, The results of study suggest that we need to develop a unique teaching method which based on learners constitution and major instead of uniform teaching method.

• Journal of Convergence for Information Technology
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• v.9 no.6
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• pp.75-82
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• 2019

In the era of the 4th Industrial Revolution when ICT and convergence are emphasized, companies want talented people with a wide range of complex problem solving competencies, system competencies as well as major knowledge. This study examined the difference in perceived competency needed for future accounting officers using 166 valid questionaries prepared with 4 factors based on previous researches. The result shows that the workers, who majored in accounting and have more than 5 years of company experience, and the CEOs think the social competence is the most important while the accounting professors think the major competence is the most important qualification. These results indicate that, in order to reflect the industrial needs, the colleges should change their accounting major curriculums to provide various competences such as the social competence in addition to the basic major competence.

• The Korean Journal of Food And Nutrition
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• v.35 no.6
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• pp.399-410
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• 2022

To enhance the bioavailability and bioactivities of mixed herbal medicines (RW), they were fermented with lactic-acid bacteria isolated from kimchi into postbiotics (FRW). Then, from the results of the 16s rRNA sequencing analysis, lactic acid bacteria isolated from kimchi were identified to be of two species, namely Lactobacillus sakei and Leuconostoc mesenteroides. The FRW prepared from the RW were extracted using hot water (HW) and 70% EtOH (EtOH) for comparison of their macrophage-stimulating activities. Based on a comparison of the activities of the FRW extracts, nitric oxide (NO) production of HW was significantly higher than that in EtOH. An analysis of the chemical properties of the extracts showed that HW had higher contents of neutral sugar and uronic acid than EtOH as well as contained a large amount of glucose. In addition, crude polysaccharide (CP) was prepared to enhance the macrophage-stimulating activity. The FRW-CP not only secreted immunostimulatory mediators but also increased the expression of immunostimulatory genes (iNOS, TNF-α, MCP-1, and IL-6). The fractionated FRW-CP contained about 90% neutral sugars, and these sugars were mainly composed of glucose, galacturonic acid, and arabinose. Thus, FRW prepared by fermentation of RW with kimchi lactic acid bacteria were found to be immunostimulatory modulators.