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1. A Visible-Light CDM Experimental System with an EWO Interference Canceller Using Modified Prime Sequence Codes

Author

Kawamoto, Ryo, Nakamura, Shinya, Matsushima, Tomoko, Miyazaki, Shinichiro, Omura, Kotoku, and Yamasaki, Shoichiro Yamasaki

Subjects
Optical CDM, Experimental System, MUI Canceller, MPSC, FPGA
Abstract

Visible-light communication systems are suitable to realize secure indoor networks. In this paper, a visible-light CDM experimental system developed by the authors with an FPGA and white LEDs is reported. The developed system adopts EWO signaling scheme as an MUI canceller. The signature codes can be selected from MPSCs and inverted MPSCs with a code length of 16. It has five channels on each of which 31.25kHz MIDI data spread with a code sequence is transmitted. The experimental system has five LEDs to transmit coded sequences with a chip rate of 500kcps. Multiplexed optical signal sequence is received by the receiver and decoded by each of five EWO decoders. It has been shown that the average light intensity of the system employing an inverted MPSC with a length of ????????2 is, theoretically, ????????−1 times as high as that of the system employing a non-inverted MPSC with the same length. It is shown that experimental results about light intensity obtained with the developed system agree well with the theoretical results.

Published
2018

3. Influence of one-step professional mechanical tooth cleaning pastes on surface roughness and morphological features of tooth substrates and restoratives.

Author

Yoshiyuki Amari, Toshiki Takamizawa, Ryo Kawamoto, Yasuhiro Namura, Ryosuke Murayama, Munenori Yokoyama, Akimasa Tsujimoto, Masashi Miyazaki, Amari, Yoshiyuki, Takamizawa, Toshiki, Kawamoto, Ryo, Namura, Yasuhiro, Murayama, Ryosuke, Yokoyama, Munenori, Tsujimoto, Akimasa, and Miyazaki, Masashi

Subjects
SURFACE roughness, TOOTHPASTE, SURFACE cleaning, TEETH, SURFACE texture, DENTAL resins, PHYSICS, CATTLE, ANIMAL experimentation, MATERIALS testing, DENTAL enamel, SURFACE properties
Abstract

Purpose: This study investigated the influence of professional mechanical tooth cleaning (PMTC) pastes on the surface texture of different subject materials.Methods: Two one-step PMTC pastes, Clinpro Cleaning Paste for PMTC (CP) and PRG Pro-Care Gel (PG), and multiple-step PMTC pastes, Merssage Regular (MR), Merssagge Fine (MF), and Merssage Plus (MP), were used. For comparison, PMTC was performed using distilled water without paste (DW). The subjected materials used were bovine enamel (ENA) and dentin (DEN), a resin composite (FSU), and lithium disilicate (IEC). The prepared specimens were polished using a #2000-grit silicon carbide paper. PMTC was performed using a brush at 1,000 rpm for 15 s.Results: The surface roughness (Ra) values of the specimens before and after PMTC were measured by laser scanning microscopy. The Knoop hardness number (KHN) of the subjected material was obtained. The types of PMTC pastes and subject materials had a significant influence on the Ra values and KHN. For the majority of subject materials, the descending order of Ra values after PMTC was MR > MF > CP > PG > MP > DW. The descending order of KHN of the materials was IEC > ENA > FSU > DEN.Conclusion: Although one-step PMTC pastes appeared to be effective, it is important to consider the subject material during PMTC. [ABSTRACT FROM AUTHOR]

Published
2021
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