https://oak.chosun.ac.kr/handle/2020.oak/19132 2025-08-20T07:21:17Z https://oak.chosun.ac.kr/handle/2020.oak/19218 Title: 가속도센서를 이용한 도로비탈면 실시간 센싱 시스템 구현 Author(s): 유소월; 강동식; 배상현 Abstract: A real time road slopes sensing system using acceleration sensor implemented in this study is able to sense the slope and risk conditions along expressways and highways in real time, to detect slope collapse and a dangerous situation on the basis of the sensing data, and thereby to notify the sensing system of the state in real time and give a warning to drivers on road to minimize damage. This study produced a sensor unit to detect the slope state along road and a control unit, and designed a photovoltaic unit to supply power in consideration of difficult power supply situation. To evaluate the performance of the implemented system, the sensor unit connected through RS-485 communication line was fixed at an experimental model slope. In the experiment, an impact was imposed on the sensor unit in various motion directions. As a result, the monitoring system displayed a sensor warning message when there was continuous oscillation more than 5 seconds or an inclination of more than 5 degrees, and displayed a rockfall detection message when there was a upper falling rock impact. 2016-12-31T15:00:00Z https://oak.chosun.ac.kr/handle/2020.oak/19219 Title: ISO-5660 콘 칼로리미터 PMMA 연소실험의 FDS 전산모사 Author(s): 홍터기; 박설현 Abstract: ISO 5660 cone calorimeter experiments were simulated using Fire Dynamics Simulator (FDS) in the present study. In cone calorimeter experiments, PMMA (Poly methyl methacrylate) which does not generate char during pyrolysis process was used as a solid fuel. The thermal properties of PMMA reported in literature was set as an input variable of FDS. The experimentally measured mass loss rate and heat release rate in the ISO 5660 cone calorimeter experiments were then compared with those numerically calculated from the FDS simulation. Comparisons made between cone calorimeter experiments and FDS simulations clearly highlight an importance of thermal properties of PMMA measured as a function of temperature as input variables. 2016-12-31T15:00:00Z https://oak.chosun.ac.kr/handle/2020.oak/19216 Title: CFRP 적층재의 계면수가 관통파괴특성에 미치는 영향 Author(s): 양용준; 박수철; 정종안; 양인영 Abstract: CFRP composites have been widely used in the aerospace industry due to their excellent specific strength and specific stiffness. However, one of the technical issues related to use of CFRP composites in the aerospace industry is foreign object damage (FOD) which can cause unexpected destruction of materials. Therefore, a series of experiments were performed to clarify the effects of the FOD on the puncture characteristics of CFRP composites. In particular, comparisons of impact energy vs. puncture energy, impact energy vs. absorbed energy, and crack pattern for given impact energy have been made in this study with regards to the interface number of orthotropic CFRP laminates. 2016-12-31T15:00:00Z https://oak.chosun.ac.kr/handle/2020.oak/19217 Title: 전기자동차와 에너지 저장장치 출력 특성에 적합한 원통형 리튬이온 셀 비교 분석 Author(s): 이평연; 김종훈; 최연옥; 김창진 Abstract: This research elaborately performed the comparative analysis of 18650 lithium-ion cylindrical cells that suitable for electric-powered application such as electric vehicle (EV) and battery energy storage system (BESS). For this, two kinds of 18650 lithium-ion cylindrical cells with high-power and high-energy characteristics are well considered (two high-power and two high-energy lithium-ion cells). According to electrochemical characteristics in lithium-ion cells, some internal parameters including discharge capacity, open-circuit voltage, and discharge/charge resistances are respectively measured. From various experimental results implemented, this research surely provides useful solutions for selection of 18650 lithium-ion cylindrical cells with the purpose of the EV and BESS. 2016-12-31T15:00:00Z