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Development of a Wireless Charging System based on LLC Resonant Converter for Underwater Drone
Jia-Wei Liu,Yu-Shan Cheng,Kun-Che Ho 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
Autonomous underwater vehicles (AUV), also known as underwater drones, often play the important role of assisting humans to complete the tasks of ocean exploration, monitoring, and inspection of underwater infrastructure. However, the limited power supplied by batteries has restricted the navigation tasks of underwater vehicles. The development of a wireless power transfer (WPT) system for AUVs can be regarded as an important first step to realize a fully unmanned underwater vehicle. Therefore, this paper aims to develop a wireless power transfer system suitable for underwater vehicles to solve charging issues in an underwater environment. Considering the special environment with seawater as the medium, a 200W WPT charging system is implemented based on the full-bridge LLC resonant circuit combined with the loosely coupled coil and the step-down circuit. The experimental results have validated the system is able to operate in an underwater environment with the efficiency up to 90.17% in freshwater and 87.05% in seawater.
Vin Cent Tai,Hui Xin Che,Xin Ying Kong,Kah Chun Ho,Wei Ming Ng 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
Over the past decade, incessant research efforts have been devoted to the development of iron oxidenanoparticles (IONPs) for wastewater industry. Past research has witnessed the potential of non-toxicand abundant IONPs to serve as powerful nanosorbents and nanocatalysts, which has become an innovativeresearch point to provide adequate, safe, sustainable, and affordable wastewater treatment for preservingthe environment. To improve the efficiency of wastewater treatment process, worldwideresearchers have made substantial efforts in tuning the size, morphology, chemical composition, and surfacechemistry of IONPs. This review provides an up-to-date overview of the synthesis strategies, limitationsand transformation of IONPs for wastewater treatment. Special mentions on the varioustransformations of IONPs such as functionalization, homogenous-heterogenous catalyst, multifunctionalcatalyst, and green synthesis routes of IONPs. Finally, the constraints that hinder the real-life applicationsof IONPs, including the challenges in the development of IONPs with ideal properties, the long-term stabilitythat allows their repeated usage in wastewater treatment, and understanding their potential environmentalimpacts are outlined. Future research should focus on developing highly efficient andenvironmental friendly synthesis approaches, optimizing the stability and reusability of IONPs, and conductingthorough assessments of their potential environmental impacts to fully realize the potential ofIONPs in the wastewater industry.
압박성 신경병증에 의한 족하수(足下垂) 환자(患者) 1례(例)에 대한 임상적(臨床的) 고찰(考察)
신정철,이동현,위통순,김선종,최원확,류충열,윤여충,조명래,채우석,나건호,Shin, Jeong-Cheol,Lee, Dong-Hyun,Wei, Tung-Shuen,Kim, Seon-Jong,Choe, Won-Hwak,Ryu, Chung-Ryul,Yun, Yeo-Choong,Cho, Myung-Rae,Che, Wu-Suk,Na, Gun-Ho 대한침구의학회 2005 대한침구의학회지 Vol.22 No.4
Objectives : The Purpose of this study is to report in patient with common peroneal nerve palsy, who improved by oriental medical treatament. Methods : We Checked the temperature of a leg by Digital Infrared Thermal Imaging(DITI) at intervals of 10 days, angle of active dorsiflexion and range of active motion for estimating the improvement of symptoms. We used the Visual Analogue Scale(VAS) for estimating the degree of pain, too. Results : After 4 weeks treatment, the movement and power of ankle joint improved to nearly normal range. The degree of active dorsiflexion of the ankle increased from $-40^{\circ}\;to\;15^{\circ}$ and range of active motion increased from Gr III to Gr I. The difference of temperature between the both legs decreased remarkably. Conclusion : In this case we experienced improvement of symptoms by conservative oriental medical therapy, e.g acupuncture stimulation, herbal medication, physical therapy. It should be needed further investigation on common peroneal nerve palsy and its symptoms in order to set up a reasonable standard about a surgical operation.