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마찰전기 효과가 접목된 하이브리드 자기-기계-전기 발전 소자의 출력 특성 향상연구
백창민 ( Chang Min Baek ),김민우 ( Min Woo Kim ),이지원 ( Ji Won Lee ),김현아 ( Hyun Ah Kim ),정지윤 ( Ji Yun Jung ),윤준현 ( Jun Hyeon Yoon ),김효일 ( Hyo Il Kim ),박예진 ( Ye Jin Park ),김기훈 ( Gi Hun Kim ),김소화 ( So Hwa Kim 한국전기전자재료학회 2022 전기전자재료학회논문지 Vol.35 No.6
Energy harvesting technologies that can convert wasted various energy into usable electrical energy have been widely investigated to overcome the limitation of batteries for the powering of IoT sensors and small electronic devices. Hybrid energy harvesting is known as a technology that enhances the output power of single energy harvesting device by housing two or more various energy harvesting mechanisms. In this study, we introduce a hybrid MME (Magneto-Mechano-Electric) generator coupled with the triboelectric effect. Through FEA modeling, four triboelectric materials, including PI (Polyimide), PFA(Teflon), Cu, and Al, were selected and compared with the expected triboelectric potentials. The effect of surface morphology was investigated as well. Among various combination of triboelectric materials and surface morphologies, PFA-Al combination with the surface morphology having nano-scale square projections showed highest output potential under triboelectrification. It is also experimentally confirmed that output voltage and power of the hybrid MME generator with triboelectric material combinations.
이제호,김소화,윤정훈,최병재 대한소아치과학회 2001 大韓小兒齒科學會誌 Vol.28 No.2
신생아에서 흔히 발생하는 연조직 종양으로는 신생아의 구개 및 치은 낭종(palatal & gingival cyst of the newborn), 선천성 치은종(congenital epulis), 혈관종(hemangioma), 기형종(teratoma), 화농성 육아종 및 자극성 섬유종(pyogenic granuloma & irritation fibroma)이 있다. 이렇게 신생아의 치조계에서 발생한 연조직 종양은 대부분 외과적으로 절제하여 치료하며, 치료하지 않는 경우 흡인(aspiration)으로 인한 기도 폐쇄 및 호흡 곤란, 구강으로 수유시 불편감, 비강으로 수유시 구토가 불가능해 흡인폐렴(aspiration pneumonia) 유발 가능성이 있다. 본 증례는 신생아의 치조제에 발생한 연조직 종양으로, 외과적으로 절제하여 치료하였으며, 조직 검사 소견상 화농성 육아종 및 자극성 섬유종과 유사하였지만 다핵형 거대세포(multinucleated giant cells)가 관찰되었고 선천적으로 발생하였다는 점에서 차이가 있었다. 이 종물의 병리 기전은 아직까지 명확하지 않으며 어떤 특정 질환으로 포함시키는 데 문제점이 있으므로 이에 보고하는 바이다. The soft tissue tumors that occur commonly in newborn infants include palatal and gingival cyst of the newborn, congenital epulis, hemangloma, teratoma, pyogenic granuloma, and irritation fibroma. Such soft tissue tumors in the alveolar ridge of newborns are usually treated by surgical excision. If untreated, they can cause air-way obstruction and breathing difficulty due to aspiration. They also cause discomfort during oral feeding. If nasal feeding is tried, since vomitting is impossible, there is a risk of aspiration pneumonia. In this case, a newborn infant visited our hospital with soft tissue tumor as chief complaint, and the infant was treated by surgical excision. It appeased to be similar to pyogenic granuloma and irrtation fibroma upon histologic exam. However, it was different from those diseases since multinucleated giant cel1s were observed and it was congenital. The pathologic process of this neoplasm is not clear. This case is reported, since it is difficult to classify it as a specific disease.