https://oak.chosun.ac.kr/handle/2020.oak/18309 2026-04-09T22:16:27Z https://oak.chosun.ac.kr/handle/2020.oak/19365 Title: 큐브인공위성과 인공지능을 융합한 북한군 이동식무기체계의 탐지 및 추적에 대한 연구 Author(s): 구건우 Abstract: This paper studies the priority given to real-time monitoring and tracking of mobile weapons systems, including transporter erector launchers, which are a major danger to the military of the Republic of Korea. Also, it aims to present economic and effective measures for observation of the North Korean military by combining artificial intelligence technology with Cube satellites. A large number of Cube satellites were launched into their target orbit and operated. Then the data collected was used to determine how to enable real-time monitoring and tracking of mobile weapons systems, including transporter erector launchers and mobile weapons, of the North Korean military. Besides, the paper describes the process of identifying in actual satellite imagery the weapons, positions, and bases of the North Korean military and conducting virtual experiments with the “Vance AI” and “Google Cloud Platform” tools. 2019-12-31T15:00:00Z https://oak.chosun.ac.kr/handle/2020.oak/19366 Title: 콩나물부산물로부터 열수추출을 이용한 폴리페놀과 플라보노이드 생산 Author(s): 홍지우; 감다혜; 김화영; 김진우 Abstract: Spent bean sprouts (SBS) are produced during the cultivation, cleaning, and packaging processes for bean sprouts. They account for 50% of total bean sprout production and cause environmental problems and waste disposal costs. This study was conducted to produce bioactive materials including phenolic compounds and flavonoids from SBS in order to produce value-added materials and reduce waste disposal costs. The optimization of extraction conditions was investigated for selection of solvents and evaluation of the effects of main variables, including solvent concentration, extraction temperature, and extraction time. Among these three variables, ethanol concentration showed the greatest effects on the production of total phenolic compound (TPC) and total flavonoid content (TFC). The optimal extraction condition was found to be 57.2˚C, 78.7 min, and 39.0% ethanol (v/v), which resulted in 28.0 mg GAE/g DM for TPC and 1.52 mg QE/g DM for TFC. The production of high concentrations of phenol compounds and flavonoids from SBS by hot-water extraction proves that SBS can be used in the production of functional food and cosmetics materials. 2019-12-31T15:00:00Z https://oak.chosun.ac.kr/handle/2020.oak/19364 Title: 잔골재의 미립분 보충재로 순환골재 미분말을 활용하는 모르타르의 기초적 특성 Author(s): 한인덕; 장명훈 Abstract: In order to improve the performance of cement mortar using combined sand of crushed and sea sands, this study analyzed its fundamental properties in accordance with replacement by recycled aggregate powder. The results showed that for binary aggregate with crushed and sea sands in a 6 to 4 ratio, the standard gradation was satisfied with replacement by less than 7.5% of recycled aggregate powder. Furthermore, as the replacement ratio of the recycled aggregate powder was increased, fluidity decreased and air content increased. Meanwhile, with replacement of less than 10% by the recycled aggregate powder, compressive strength increased 10 to 20% under the conditions of this research. Overall, it was determined that by replacement of 2.5% of recycled aggregate powder in binary aggregate with crushed and sea sand with poor gradation, optimum results could be obtained for satisfying the standard gradation and improving the fundamental properties of the cement mortar. It is necessary to evaluate the possibility of applying this result to concrete and actual structures. 2019-12-31T15:00:00Z https://oak.chosun.ac.kr/handle/2020.oak/19368 Title: 바위꽃탱자나무지의류 추출물의 항산화 활성 및 염모제 소재 탐색 Author(s): 문승재 Abstract: Lichen refers to a group of organisms in which two organisms, an alga and a fungus, live together as a single organism. Algae photosynthesize and supply sugars to fungi, and fungi provide a place to live and inorganic nutrients for the algae. In this study, antioxidant activity, polyphenol content, and flavonoid content were investigated to determine the possibility of using extracts of Ramalina yasudae Rasanen as a hair cosmetic material. DPPH and ABTS radical antioxidant assays were performed and the results showed a range of 50-500 μg/mL (IC50). In the ABTS assay results for R. yasudae the IC50 values were confirmed to be 399 μg/mL for the water extract, 371 μg/mL for the methanol extract, and 250 μg/mL for the alkali extract. In an MTT assay, the R. yasudae alkali extract showed no cytotoxicity up to a concentration of 500 μg/mL. Accordingly, the R. yasudae extracts have the potential to be useful material for cosmetics and edible food. 2019-12-31T15:00:00Z