Laminated composite structures have started to play a very significant role in primary and secondary structural weight savings in high performance automobile industries. However, one of the main challenges in implementing these composites is the lack of understanding of the progress of the damage under various loading conditions. In order to understand the influence of design parameters related to the use of composite materials, a proper study of the laminated composite structures requires a complete failure analysis, which includes both initiation and propagation of damage. In this study, a new damage model was developed to predict the progressive damage of the composite, and the progress of damage was investigated by making center-notch and open-hole tensile test specimens for various lay-ups. The simulations, in agreement with experimental tests, indicate that the model is capable of predicting the failure load in open hole composite structures.

This paper describes a development of design tool for knowledge based engineering(KBE) that covers structural, aerodynamic, and optical analysis of large-scale telescope structures. A module of the commercial program Adaptive Modeling Language(AML) was used to develop a knowledge-based design tool that reflects the design of parameters for rapid design change and analysis. Through this study, it is proposed a design tool with a knowledge based engineering and a function based design technique. The knowledge based engineering design is good at frequent design changes, and it is effective to extract a core design behavior from previous designs. It is concluded that the developed tool can bring fair effects in implementing a time and cost-effective design environment.

The use of microwave-assisted extraction and an acid-base clean-up process to determine the amount of methylmercury (MeHg) in marine products was suggested in order to improve the complicated sample preparation process. The optimal conditions for microwave-assisted extraction was developed by using a 10% NaCl solution as an extraction solution, setting the extraction temperature at 50℃, and holding for 15 minutes to extract the MeHg in marine products. A NaOH solution was selected as a clean-up substitute instead of L-cysteine solution. Overall, 670 samples of marine products were analyzed for total mercury (Hg). Detection levels were in the range of 0.0006~0.3801 μg/kg. MeHg was analyzed and compared using the current food code and the proposed method for 49 samples which contained above 0.1 mg/kg of Hg. Detection ranges of methylmercury followed by the Korea Food Code and the proposed method were 75.25 (ND~516.93) μg/kg and 142.07 (100.14~244.55) μg/kg, respectively. The total analytical time of proposed method was reduced by more than 25% compared with the current food code method.

This study aimed to determine the optimal harvesting time for wheat to make grain silage, in Honam region of Korea. We harvested wheat grain every third day from 30 to 42 days after heading (DAH). The moisture content decreased from 61.6% at 30 DAH to 42.8% at 42 DAH. Yield of wheat grain significantly increased from 30 to 42 DAH (p< 0.05). Yield at 39 DAH (3.46T/ha) was not significantly different from that at 42 DAH (p< 0.05). With respect to the feed value of wheat grain silage, the amount of crude protein, crude fiber, and crude ash was different by harvesting time (p< 0.05). However, the amount of total digestible nutrients (TDN) from 30 and 42 DAH was not significantly different. The pH of wheat grain silage from 30 to 42 DAH was between 3.8 and 4.5 and it was stable until 39 DAH (p< 0.05). The lactic acid content of wheat grain silage from 30 to 42 DAH decreased from 3.08% to 1.10%. With respect to moisture content, yield, feed value, and fermentation, the optimal harvesting time for wheat grain silage was 39 DAH.

본 논문은 명대의 역적 당새아가 청대 소설 속에서 돌연 女仙이자, 나라를 구하는 영웅의 형상으로 변신한 데 주목하고, 그녀가 소설 속에서 극적인 변신을 이루게 된 원인을 고찰하였다. 이를 위해 먼저 실존인물 당새아의 행적 및 그녀에 대한 명대인의 평가를 시기별로 살펴보고, 그런 다음 청대소설 『여선외사』 속 당새아의 형상을 분석하였으며, 마지막으로 당새 아형상의 극적 변신의 이유를 소설의 창작 동기 및 평어를 중심으로 분석하였다. 역적 당새아의 소설 속 변신은 청대 초기의 사회적 배경, 즉 왕조 교체로 인해 명대에 발생했던 정난 지변을 재조명할 수 있는 환경이 마련된 것과 밀접한 관련이 있다.

반려동물산업은 지속적으로 성장하였으며, 2020년에는 반려동물 관련 시장규모가 5조 8,000억 원으로 성장할 것으로 예상된다. 하지만 반려동물 산업이 지속적으로 성장한 것에 비해, 반려동물 문화의 수준은 성숙하지 못하다. 반면에 해외의 반려동물 시장은 우리 나라보다 크고, 반려동물 문화 또한 성숙한 문화가 자리 잡고 있다. 그래서 해외 반려동물 문화 관련 현황 파악을 통해서 국내 반려동물 문화 발전을 위해 제안할 수 있는 것을 알아 보고자 총설논문을 작성하였다. KISS, DBpia, RISS, 원광대학교 중앙도서관에서 자료를 검색하였으며 자료들을 크게 국･내외 반려동물산업, 국･내외 반려동물문화, 국･내외 반려 동물 관련법과 정책으로 분류하였다. 연구결과, 우리나라의 올바른 반려동물 문화를 정착 시키기 위해서는 개선되어야 하는 점이 많았으며, 해외의 반려동물 문화를 통해 발전될 수 있다는 점이 많다고 판단된다.