https://oak.chosun.ac.kr/handle/2020.oak/100 2025-08-18T13:38:24Z https://oak.chosun.ac.kr/handle/2020.oak/18456 Title: 리튬이온전지 Cell Balancing에 관한 연구 Author(s): 김민창 Abstract: This study was conducted to improve the cell balancing performance of a battery management system (BMS) for stable use of lithium-ion batteries. The cell balancing of the BMS takes too much time because the balancing current cannot be increased during the repeated charging/discharging and stabilization operations of lithium-ion batteries. When the BMS bears the current above the specification, the long-term failure and burnout of components can occur due to persistent heat-generation with concerns about a risk of fire if it fails to respond immediately. The proposed BMS in this thesis aimed to secure stability and increase the speed of balancing by minimizing the heat problem occurring in the cell balancing through passive balancing, which reduces the delay time to reach the nominal voltage from the abnormal voltage in the event of overcharging or overdischarge. Furthermore, the overall resistance was lowered and the heat applied to the load was also reduced to minimize the heat problem by connecting additional resistors in parallel through comparing and analyzing the cell balancing performance of the BMS based on the experimental results, and the excess voltage was divided into several resistors for higher durability. This thesis can be presented as important data on the design and fabrication criteria of the circuits applying the passive balancing with respect to the heat problem during cell balancing in the BMS.| 기존의 BMS는 리튬이온 전지의 충방전과 안정화 작업 반복 과정에서 Balancing 전류를 크게 할 수 없어 Balancing의 시간이 길고, BMS의 내장된 스펙 이상의 전류량을 감당하게 될 경우, 지속된 발열로 장기적으로 부품의 고장 및 소손이 발생하며, 빠르게 대처하지 못할 시 화재의 발생이 우려된다. 따라서 본 논문에서는 개선된 전지 모듈 간 Passive Balancing을 통해 기존의 Balancing 도중 발생하는 고질적인 문제인 발열 문제를 개선하여 안정성 확보와 Balancing의 속도를 높임으로 과충전, 과방전 발생시 이상전압 상태에서 공칭전압으로 도달하기 위한 시간 지연을 단축시켜 전지의 손상을 최소화하는 회로를 제안하며 실험을 통하여 제안한 회로의 타당성을 입증하고자 한다. 2020-12-31T15:00:00Z https://oak.chosun.ac.kr/handle/2020.oak/17899 Title: 헬스클럽을 활용한 운동참여자들의 운동방법에 대한 탐색적 이해 Author(s): 오유정 Abstract: A Comparatine Amalysis of Muscle Activity of Good Oh You-Jeong Advisor : Prof. Hyun-Woo, Kim Ph.D. Major in Physical Education Graduate School of Education, Chosun University The purpose of this study is to find out how participants who use health clubs use health clubs and to understand ways to improve personal training. This study was conducted by individually selecting 10 participants who were receiving personal training and self-directed training for adult male and female members over the age of 20 who used a health club in Gwangju Metropolitan City. Data were collected by conducting in-depth interviews with selected participants. The conclusion is as follows. First, participants who trained self-directedly had positive cognitive perception and psychodynamic changes only when their self-efficacy was high. Second, it was found that there were not many participants who trained using colleagues because personal training, a direct teaching method, was more effective. Third, participants who received personal training presented customized exercise to members, felt a change in their bodies, and their self-efficacy increased. This was found to be a positive effect that can be continued steadily. Fourth, negative reactions such as personality, qualification, and exercise guidance appeared in the negative reactions of personal training. As a result, in order to effectively receive personal training, it is necessary to change the personality, qualification, and exercise guidance of the trainer. 2023-12-31T15:00:00Z https://oak.chosun.ac.kr/handle/2020.oak/17898 Title: 한지 매체를 활용한 오감 발달 유아 미술교육 Author(s): 김솔 Abstract: ABSTRACT Multisensory Development in Early Childhood Art Education Utilizing Hanji as a Medium Kim Sol Advisor : Prof. Hong-soo Park ph.D. Major in Fine Arts Education Graduate School of Education Chosun University This study proposes an art education curriculum for preschoolers' sensory development through various sensory activities using traditional Korean paper, Hanji. The lesson plans is organized into a total of six sessions: First, the activity 'Diving into Hanji' encourages participants to freely experience all senses through Hanji and games. Second, 'Hanji Collage with Rhythm' involves listening to music and cutting and pasting Hanji according to the rhythm. Third, 'What Clothes Will Future Me Wear?' focuses on expressing clothing related to one's future aspirations using Hanji. Fourth, 'Creating Hanji Pizza with My Recipe' involves using Hanji to make a personalized pizza based on one's own recipe. The anticipated effects of this study include the potential development of various aspects such as sensory perception, cognition, and aesthetic abilities in preschoolers through the properties and expressive techniques of traditional Hanji. Additionally, active learning abilities can be cultivated through cooperative and sensory appreciation activities. However, it is emphasized that due to the thin and water-absorbing nature of Hanji, frequent handling is crucial, and continuous research is needed through the development of diverse lesson plans. While the study did not directly execute in practical settings, it is hoped that the outcomes contribute to the active utilization of Hanji as a medium for the sensory development of preschoolers in art education. Therefore, the anticipated effects of this study include laying the foundation for the development of various areas such as sensory perception, cognition, and aesthetic abilities in preschoolers through the properties and expressive techniques of Hanji. It can also contribute to raising awareness of the importance of the nation's culture and influencing a sense of Korean emotion. However, due to the thinness and good water absorption of Hanji, frequent handling is crucial, and continuous research is needed through the development of diverse programs. While the study did not directly execute in practical settings, it is hoped that in the future, this research will be utilized in preschool art education, actively promoting the use of Hanji as a medium for the sensory development of preschoolers. 2023-12-31T15:00:00Z https://oak.chosun.ac.kr/handle/2020.oak/17897 Title: 한국산과 중국산 짚신나물의 영양성분 및 항산화효과 비교 Author(s): 양다현 Abstract: Comparisons of Nutritional Components and Antioxidative Effects of Korean and Chineses Agrimonia pilosa Ledeb. Yang Da-Hyun Advisor : Prof. Lee, Jae-Joon, Ph. D. Major in Nutrition Education Graduate School of Education, Chosun University This study compared the effects of Korean Agrimonia pilosa Ledeb.(L.) powder and Chinese Agrimonia pilosa L. powder on their nutritional components and antioxidative effects. The crude fat contents of Korean Agrimonia pilosa powder L. were higher than those of Chinese Agrimonia pilosa L. powder. There were no significant differences in the contents of moisture, crude protein, crude ash, and carbohydrates between Korean Agrimonia pilosa L. powder and Chinese Agrimonia pilosa L. powder. The total amino acid contents were in the order of aspartic acid, glutamic acid, and leucine for both Korean and Chinese products. The total saturated fatty acid contents of Chinese Agrimonia pilosa powder L. were higher than those of Korean Agrimonia pilosa L. powder, while the contents of monosaturated fatty acid polyunsaturated fatty acid were higher in Korean Agrimonia pilosa L. powder. In the case of organic acids, Korean Agrimonia pilosa L. powder were detected in the order of malic acid, tartatic acid, citric acid, acetic acid, and formic acid, while Chinese Agrimonia pilosa L. powder were detected in the order of tartaric acid, malic acid, citric acid, formic acid, lactic acid, and acetic acid. As a result of analyzing the mineral content of Korean Agrimonia pilosa L. and Chinese Agrimonia pilosa L., both were found to have a high potassium content. The total polyphenol content of ethanol extracts of Korean and Chinese Agrimonia pilosa L. powders was found to contain 190.48 mg GAE/g and 182.44 mg GAE/g, respectively. The total flavonoid was also found to contain 445.33 mg QE/g of Korean Agrimonia pilosa L. and 242.90 mg QE/g of Chinese Agrimonia pilosa L. When comparing the DPPH radical erasing ability and the ABTS radical erasing ability, Korean Agrimonia pilosa were measured higher than Chinese Agrimonia pilosa L. at all concentrations. In conclusion, these results indicate that Korean Agrimonia pilosa L. powder are slightly better at preserving nutritional and antioxidant activity compared to Chinese Agrimonia pilosa L. powder. Furthermore, these results may provide basic data for future studies for a better understanding of the functional activity of Agrimonia pilosa L. powder. 2023-12-31T15:00:00Z