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박응원,차홍대,강진무 啓明大學校 醫科大學 1991 계명의대학술지 Vol.10 No.3
The weaning diet should bw started in proper time to provide good nutrition for the infants under the age of one year. This study was carried out to investigate the present status of weaning in infants and to give good guidelines for the establishment of an ideal weaning method. The study included 650 mothers in three rural areas around Taegu City(Ko-Ryung, Keu-Chang and Young-Dik) during the period from January to JUly 1990. The results of the questions were analysed and compared with data which was obtained from the study cone at the Department of Pediatrics, Keimyung Universith Hospital for the children in Taegy City recently. The weaning which was started at the age of 6 months was 19.5%, at 5 months 18.0&, 3 months 15.8% and 68.1% started between 3 and 6 months. there was no difference in the initial weaning period relative to the educational level of the mother, feeding method, or the birth order. The weaning was completed bvefore 6 months of age in 38.3% and 12 months in 55.2%. 50.3% of the mothers used commercial foods for a weaning diet and 25.45 used home-made foods. The most frequently used food for initial weaning diet was fruit(59.6%). Beef(56.2%) was the most commonly used meat, apples(61.7%) among fruits, and spinach(50.0%0 among vegetables. 39.2% of the mothers gave in the initial weaning diet as much as the infant needed. Majority of the mothers (45.4%) started with an initial weaning diet schedule of two times daily, and added new weaning diet at intervals of 3 to 4 days. The main source of obtaining the knowledge about weaning was newspaper or television (39.8%) and books lor magazines(26.0%). Abnormal conditions following weaning were, in order of frequency, diarrhea(20.0%), vomiting(14.8%) and constipation (2.2%). Initial weaning period in rural areas was delayed and the completion period was earlier than in that of urban areas. The main source of knowledge about weaning was newspaper or television in rural areas in contrast to books or magazines in urban areas. Fruit was most frequently used initial weaning diet, with beef among the meats, apples among fruits, and spinach among the vegetables with similarity in boty rural and urban areas. For the initial meat in the weaning diet fist was minimal while chicken and pork were more abundant than in urban are as. There was no difference in the weaning method used in boty areas. It is necessary to design educational efforts to establish an ideal was of establishing the weaning diet and method for infants.
FDM 방식의 3D 프린터를 이용하여 제작된 격자 구조물의 좌굴 파손 거동 평가
진지원,정범균,박응원,강기원 대한기계학회 2020 大韓機械學會論文集A Vol.44 No.8
In this paper, the buckling failure behavior was evaluated through compression test and structural analysis of cylindrical lattice structures manufactured with fused deposition modeling 3D printer. First, standard specimens were manufactured using fused deposition modeling 3D printer to obtain mechanical properties. Based on these, cylindrical lattice structures were designed and manufactured. In addition, buckling behavior was analyzed by finite elements analysis of cylindrical lattice structures. Cylindrical lattice structures were manufactured according to the 3D printer infill fraction, and compression tests were performed. Through the compression test, the results of buckling behavior and deflection according to the infill fraction of the material were compared the finite element analysis. Based on these results, the influence factors on the cylindrical lattice structures were verified. 본 논문에서는 소재 압출 방식인 3D 프린터로 제작된 원통형 격자 구조물의 압축 시험 및 구조 해석을 통하여 좌굴 파손 거동을 평가하는 것이다. 이를 위해 먼저 소재 압출 방식의 3D 프린터를 이용하여 표준 시험편을 제작하여 기계적 물성을 획득하였으며, 이를 바탕으로 원통형 격자 구조물을 설계 및 제작하였다. 또한 원통형 격자 구조물에 대한 유한요소 해석을 수행하여 좌굴 거동을 분석하였다. 3D 프린터의 특성인 채움량에 따라 원통형 격자 구조물을 제작하여 압축 시험을 수행하였다. 압축 시험을 통하여 소재의 채움량에 따라 좌굴 거동 및 변형량에 대한 결과를 유한요소 해석과 비교하여 평가하였다. 이러한 결과를 토대로 격자 구조물에 미치는 영향 인자를 검토하였다.