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Low-intensity pulsed ultrasound exposure has been shown clinically to shorten the fracture repair process and to induce healing of nonunions in humans, but its mechanism of action remains unclear. In this study we investigated the effect and mechanism of low-intensity pulsed ultrasound on nonunion fracture healing in rat tibias. A consistently reproducible(More)
In this paper, we propose a new function for construction work undertaken to install optical fiber lines for services in a passive optical network (PON). This paper describes a novel measurement technique designed to check for optical filters located in front of an optical network unit in branched optical fiber regions in PONs with outside optical(More)
This paper introduces an in-service line monitoring technique that can locate a fault in branched optical fibers in passive optical networks (PONs) from a central office. This technique can upgrade the conventional optical fiber line testing and monitoring system. To distinguish a backscattered signal from each branched PON fiber, we employ the fibers with(More)
We investigated the effects of low-intensity pulsed ultrasound on distraction osteogenesis in a rabbit model. Callotasis of the right tibia was performed in 70 male Japanese white rabbits using mini-external fixators. In the first part of the study in 64 animals using normal distraction (waiting period seven days; distraction rate 0.5 mm/12 hours;(More)
Transmission limitations due to stimulated Brillouin scattering and four-wave mixing processes are investigated for optical FDM systems. The applicability of the dispersion-shifted and nondispersionshifted fibers is discussed taking account channel frequency separation, total channel numbers, input signal power, transmission length, and receiver sensitivity(More)
This paper proposes a method for the interferometry path length measurement of dualized optical transmission lines with a precision of 1 mm. The frame-loss-free line switching of in-service GE-PON is realized by continuously transferring signals.
This paper presents a method for adjusting a free space optics (FSO) system that links two single-mode optical fibers using collimators with a symmetrical configuration. It operates as if the two optical fibers were seamlessly connected without the need for any photoelectric devices. Collimator focusing, as well as axis alignment, is critical for low-loss(More)