著者
塩見 格一 植田 知雄
出版者
公益社団法人 日本航海学会
雑誌
日本航海学会論文集 (ISSN:03887405)
巻号頁・発行日
vol.102, pp.37-45, 2000
参考文献数
3

Even in these days, almost small airports and heliports have no equipment for aircraft surveillance. Many air traffic operation and airport operation service providers then request to develop the equipment for monitoring airspace to improve their service performance. We then think it is important to make the most effective use of conventional Secondary Surveillance Radar (SSR) system currently widely used, and we propose a Passive SSR (PSSR) to meet the request. The PSSR is the slave system for a conventional SSR of the mode-A/C system. The PSSR is a very compact and potable system consisting an omnidirectional antenna to receive the SSR replies from aircraft, an antenna to receive the SSR interrogations from a master SSR system, and a digital signal processor such as a personal computer for identifying aircraft and calculating the position of the aircraft. The PSSR installed within the coverage of the conventional SSR can provide SSR mode-A/C information without any radio transmission as interrogation. An Airspace Surveillance Network will be able to be established economically by utilizing PSSRs and InterNet.
著者
内田 洋子 高木 直之
出版者
公益社団法人 日本航海学会
雑誌
日本航海学会論文集 (ISSN:03887405)
巻号頁・発行日
vol.126, pp.55-64, 2012
参考文献数
7

The present study investigated patterns of foreign accent conspicuous in English produced by native speakers of Chinese. Native speakers of English and Japanese listened to English speech data collected from Chinese-speaking cadets, and reported Chinese accents they heard. Based on their reports, the authors pointed out typical Chinese accents which Japanese speakers are likely to find confusing, with a support of Pinyin transcription and contrastive analyses of Chinese, English, and Japanese. They included realization of English /v/ as [w], peculiar quality of/l/ and /r/ when following a vowel, and insertion of an extra vowel and/or omission of a consonant in a sequence of two or three consonants. China being one of the most important trading partners, we strongly believe that knowledge on characteristics of Chinese accented English described here will help Japanese people in the maritime sector with easier communication with Chinese seafarers, which will contribute to safer navigation of ocean-going vessels.
著者
森田(藤原) 紗衣子 藤本 昌志 渕 真輝
出版者
公益社団法人 日本航海学会
雑誌
日本航海学会論文集 (ISSN:03887405)
巻号頁・発行日
vol.128, pp.123-133, 2013 (Released:2013-03-29)
参考文献数
47

In recent years, it is reported the violations of “the ordinary practice of seamen”are increasing in marine accident inquiries. It can be inferred from a stretched interpretation of “the ordinary practice of seamen”.After all, it means that there is no clear concept of “the ordinary practice of seamen” in Japan. Therefore, this paper is an attempt to overview a new interpretation of “the ordinary practice of seamen” in Japan.Formerly“best aid to avert collision”was synonymous with “the ordinary practice of seamen”. So, it is considered that there is a relation between “action by stand-on vessel”and“the ordinary practice of seamen”. Finally, the issue of marine accident inquiry system is studied on the base a stretched interpretation of “the ordinary practice of seamen”.
著者
澤田 実希 千葉 元 斎藤 重信
出版者
公益社団法人 日本航海学会
雑誌
日本航海学会論文集 (ISSN:03887405)
巻号頁・発行日
vol.138, pp.74-84, 2018

<p>After the building of the ship taking over the "Kaiwo Maru I" was planned, in Shinminato City (at the time), devoted movement inviting her had been developed since around 1980. In 1990 she was moored at Fushiki-Toyama port temporarily, and "Kaiwomaru Park" was built two years later. In 1994, permanent preservation of her (at Fushiki-Toyama port) was decided. Afterward, events such as full-sail exhibition or maritime educational program have been held. Through these efforts, the "Kaiwo Maru I" increases visitor's knowledge and interest in ocean and ships. She also has contributed to maritime education for the younger generation. We first specify the detail of inviting her that many people made efforts and achievements after her retirement. Then, in order to leave the "Kaiwo Maru I" eternally for the next generation, we propose the significance of her existence and how she can contribute to society that are able to win people's understanding in both hardware based and software based (tangible and intangible) elements.</p>
著者
雨宮 洋司
出版者
公益社団法人 日本航海学会
雑誌
日本航海学会誌 (ISSN:04666607)
巻号頁・発行日
vol.44, pp.113-123, 1970

It was calculated each P.D.C. of 15 items added physically and directly to the container cargoes during processing from vanning to shipping by the productive implements and labor efficiency. The laborers' working hours and wages were fixed at present and some schemes and problems for the rationalization of container system were investigated parameterically. The results are reported as follows: 1. The container transportation form using the trailers shoud be planned variously before the curtailment of the drivers' number. 2. Compared the researched quantity of operating cargoes with the number of container berths being planned in Japan, the excess of supply about the number is considered. 3. The lower P.D.C. of the road, straddle carrier and labourers in port hinders lowering the total P.D.C. 4. The most suitable scheme of the container transportation is to balance each P.D.C. added to cargoes by the processing parts.
著者
今枝 彬郎 中原 壽喜太 木村 隆一 久保 雅義 三木 楯彦
出版者
公益社団法人 日本航海学会
雑誌
日本航海学会論文集 (ISSN:03887405)
巻号頁・発行日
vol.71, pp.55-61, 1984

めまいを生じたとき直立姿勢をとっている人の身体動揺がどのようになるかを調べるため,回転する回転台上で直立している人の姿勢応答を測定した。(1)回転台上で直立する人の重心は不規則な運動をしており,そのうちの一部の時間は右回りまたは左回りをしながら動揺している。被験者の約80%は回転台の回転方向が逆転すると重心の回転方向も逆転する。(2)閉眼で回転台上に直立する人は回転台の回転方向が右回りでも左回りでも身体はわずかに前方に傾きながら前後左右の方向にほぼ同じように揺れる。(3)開眼で回転台上に直立する人は回転台の回転方向が左回りの時は身体が右に,台が右回りの時は身体が左に傾きながら動揺を続ける。(4)回転台の回転が停止するとき眼振が生じるが,回転台の回転角速度が大きいほど停止時の負の角加速度の絶対値も大きくなり台上の被験者の眼振持続時間は長くなった。まためまい感の持続時間も長くなった。(5)回転台上で直立する被験者が足を開いて立つか,閉じて立つか,マンの姿勢をとるかによって身体動揺の様式が変わり,頭部と重心のパワースペクトルも異なる分布を示した。マンの姿勢は不安定でパワースペクトルは周波数の大きい成分が増大した。(6)台の回転数を増すと頭部と重心のパワースペクトルの主成分は高い周波数の方へ移動した。
著者
海老沼 拓史 近藤 俊一郎 岩 張 安田 明生
出版者
公益社団法人 日本航海学会
雑誌
日本航海学会論文集 (ISSN:03887405)
巻号頁・発行日
vol.118, pp.213-220, 2008-03-25 (Released:2017-01-15)
参考文献数
16
被引用文献数
1 1

Galileo is the European Global Navigation Satellite System (GNSS) designed to be interoperable with the United States' Global Positioning System (GPS). Galileo and GPS interoperability means that hybrid GPS/Galileo receivers will offer improved performance in several ways compared to GPS- or Galileo-only receivers. This paper presents the design and implementation of a software GPS/Galileo receiver, together with testing results using a real Galileo signal from GIOVE-A, the first Galileo in-orbit validation satellite. Furthermore, a new navigation solution algorithm to estimate the GPS-Galileo system time difference is proposed. Hybrid navigation results show that 2 m (2drms) positioning accuracy can be achievable without knowing the exact system time difference.