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Distinction of Landslide by Monitoring Acceleration to Autonomous Node In Wireless Sensing Network
Yasutaka Nakajima,Riki Ohbayashi,Shigeru Takayama 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
For monitoring natural landslide disaster, wireless sensing node network is so effective system. The sensingnode is constructed by some sensors (acceleration, soil moisture, GPS and so on), data processing unit (micro processor)and wireless communication unit. The network topology we have constructed is mesh type. In the system, at sensinglandslide, the node will transport the information to host system through the node network by using wirelesscommunication. Generally, in natural field, the landslide is sensed as the changing of acceleration. But, it is sodifficult to distinguish the landslide obviously. The acceleration of the sensing node will change by not only thelandslide disaster but also collision with several hard blocks like stones. This paper describes the distinction method oflandslide disaster by using only the signal of acceleration sensor mounted in the sensing node. The method focuses thetime transition of frequency distribution of the acceleration signal. Observing the time transition, the situations ofsensing node have been distinguished.
Isolated Right Ventricular Apical Hypoplasia: A Case Report with 18 Years of Follow Up
Oya Takashi,Kitagawa Kakuya,Kokawa Takanori,Nakajima Hiroshi,Nakamori Shiro,Ogihara Yoshito,Nakata Kei,Ishida Masaki,Ichikawa Yasutaka,Sakuma Hajime 아시아심장혈관영상의학회 2021 Cardiovascular Imaging Asia Vol.5 No.2
Isolated right ventricular (RV) hypoplasia is a rare congenital anomaly in which the apical trabecular component of the ventricle fails to develop. In severe forms of isolated RV hypoplasia, patients usually develop cyanosis early in life and require prompt surgical intervention. Mild forms, however, can be asymptomatic until the development of severe tricuspid regurgitation due to annular dilatation. We report a 50-year-old woman with isolated RV apical hypoplasia who presented to our hospital 18 years ago and was followed with serial imaging studies.