著者

武藤 康

出版者

独立行政法人 海技教育機構

雑誌

海技教育機構論文集 (ISSN:24337749)

巻号頁・発行日

vol.1, pp.7-18, 2017 (Released:2020-12-17)

参考文献数

6

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A 30 mm × 45 mm size amplifier integrated printed circuit board antenna (also called a probe) developed by Roelof Bakker was manufactured to receive a LF band of 136 kHz, which was recently approved for use in amateur radio. It has been verified that this antenna is effective not only in the LF band but also in the MF/HF band (300kHz to 30 MHz) and part of the VHF band (30 MHz to 150 MHz). Although MF/HF band is not the main use in the ship communication, it still occupies an important role for safe navigation of ships, like reception of emergency radio signal transmission, SSB telephone, NBDP (character communication), FAX reception, DSC reception, NAVTEX reception and radio broadcasting reception,. In general, MF/HF antennas are larger than other frequency bands antenna. Therefore, as these antennas become smaller, there are many points that can be useful, such as maintainability, aesthetic appearance, and suppression of obstacles during shipboard operation. This time, I tried to construct a system with an LC resonance circuit filter and automatic tuning by a personal computer with this antenna with many noises in MF/HF use. I report the effectiveness of this prototype antenna as a commercial radio reception used in a ship.

著者

佐藤 哲司

出版者

独立行政法人 海技教育機構

雑誌

海技教育機構論文集 (ISSN:24337749)

巻号頁・発行日

vol.8, pp.31-36, 2020 (Released:2020-12-17)

参考文献数

16

著者

淺木 健司 山本 一誠

出版者

独立行政法人 海技教育機構

雑誌

海技教育機構論文集 (ISSN:24337749)

巻号頁・発行日

vol.9, pp.1-10, 2020

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<p> There is no report on the whole of communication among seafares in a navigation bridge although it is one of the most important factor in BRM. In this paper, charactaristics of communication are investigated based on thousands of discussion records by trainees and instructors after simulation exercises of BRM training. </p><p> First, the authors show the communication errors in a navigation bridge can be categorized into 24 elements, in which 7 elements relate to the quality of information to be communicated and remaining 17 ones relate to the failure of transmission. The data from the discussion records are analyzed by Principal Component Analysis ; it is shown that the degree of seafare's interest in each communication category is corresponding to the first principal component and difficulty on carring out communication is corresponding to the second one. </p><p> It is clarified that there is little correlation between the defference in types of simulation scenario and analysis results and the trainees give their mind to the matter on the failure of transmission rather than the quality of information except "ambiguity" and "obscurity".</p>