著者

Riggs R.F. O′Sullivan J.P. 吉本 高使

出版者

公益社団法人 日本航海学会

雑誌

航海 (ISSN:0450660X)

巻号頁・発行日

vol.63, pp.32-36, 1980

著者

小西 宗

出版者

公益社団法人 日本航海学会

雑誌

日本航海学会誌 NAVIGATION

巻号頁・発行日

vol.188, 2014

著者

行平 真也 浦上 昌則 高山 久明

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.134, pp.36-43, 2016

被引用文献数

1

---

This study examines the reliability and validity of M. Urakami's self-efficacy scale of career decisions for university and college students on fisheries high school students. The study used a sample of 1,310 fisheries high school students, and the test questionnaire form used in this study was a 30-item scale. The results of the examination on factor structure, reliability, validity, and basic statistics of each item suggest that the scale can also be used for fisheries high school students.

著者

岡野 良成 久々宮 久

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.65, pp.23-30, 1981-09-15 (Released:2017-01-15)

被引用文献数

1

---

Assembling the data of Crash-Stop Astern by courtesy of the Institute for Sea Training, the authors recomputed the tracks for each trial. The training ships have performed the trials at least once a year in their curriculums using various methods, namely ; (1) The Dumb-Card Method which calculates a ship's relative positions against a target afloat by observing the relative azimuths with fore and aft cards repeatedly. (2) The Sextant Method which calculates her relative positions against a drifting life boat, from which one of the ship's fixed points is measured by observing vertical angles with sextants, and of which the bearing is simultaneously observed from the ship repeatedly. (3) The Radar Method which calculates her relative positions against an appropriate floating target by measuring the distance with a radar and the bearing by a compass repeatedly. (4) The Numerical-Integration Method which calculates her track by summing up distances run during a short interval with respect to x and y directions. The above comparison shows that the Numerical-Integration Method fairly fits with the Sextant Method, which is highly evaluated by training ship officers, and from start of astern revolution the speed of the ship decreases almost linearly. The authors have arrived at the conclusion that the Numerical-Method is likely to be most suitable for merchant vessels if the trial is to be performed by the ship's crew only. This is because this method can be carried out only by 2 or 3 personnel. It is to be remembered, however, that the speedmeter precheck is vital.

著者

河口 真一郎 石田 正己

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.57, pp.33-46, 1977

---

2測定点の偶然誤差の相関度を調べるに際し,一方の偶然誤差の時系列を入力とし,他の偶然誤差を出力とする応答系としてとらえ,応答特性により周波数領域での相関度を検討した結果,函館,釧路,稚内における各レーンの夜間の偶然誤差の変動は,パワーの大部分を占める低周波領域では,確率過程として独立な現象である事が判明した。更に,定常正規確率過程の極大値の分布とその特性を,デッカ位置線のスリップ・レーンとの関係において検討した結果,スリップ・レーンを防止する為には,偶然誤差の標準偏差が0.45lane以下でなければならない事が明らかとなった。最後に,主従局からの電界強度を入力とし,デコメータの読み取り値を出力とする2入力1出力応答系としてとらえ,その応答特性を解析した結果,電界強度,デコメータの読み取り値共に大部分のパワーを有している低周波領域では,両者の相関は一般に低い事が判明した。

著者

塩谷 茂明 藤冨 信之 斎藤 勝彦

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.98, pp.375-383, 1998

参考文献数

11

被引用文献数

8 1

---

The information of ship waves generated by a small planing boat is very important to prevent damage of the marine structure, the small boat, the swimmer and so on. One of authors has researched about the mechanics of wave-making phenomena by a planing flat plate based on a planing boat in a circulating water channel experiments. As results, we have obtained these fundamental mechanics of waves generated by a planing flat plate. Therefore, we tried to develop the study on mechanics of wave-making by an actual planing boat. This paper deals with the measurements of ship waves generated by an actual small planing boat and investigations of the fundamental characteristics of generated waves. The measurements of ship waves are carried out in the case of varying distance from the sailing line with constant ship speed and varying ship speed with constant distance from the sailing line. As results, we obtained the characteristics of ship waves by a planing boat from the comparison with an ordinary displacement type boat.

著者

大山 雄佑 江崎 修央 瀬田 広明 濱地 義法

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.122, pp.45-52, 2010

参考文献数

6

被引用文献数

2 4

---

Recently the research and the development on sailing support system using video information have been advancing owing to the development of image processing technology. As for vessels, the sailing monitoring systems to watch all directions of the vessels by using omni directional image sensors have been proposed. But there are some problems on this system as follows: (1) It is difficult to confirm the distance between the vessels and the bridge when they leave or reach the shore. (2) It is too slow to do the real time processing. This is why we developed the system which can judge a positional relationship between the vessels and the bridges visually by proposing on a real time a pseudo image from the sky. We are making use of USB camera equipped with fish-eye lenses to get images. In this paper, we experimented by attaching the camera at the medium seized vessel, which have a total length of 40 meters. As a result, we found that it is possible to display a positional relationship between our ship and bridges when our ship leaves or reaches the shore, and also to display corrected images on a real time at the frame rate 10fps.

著者

間島 隆博 山口 勝治 山之内 博 蒲生 昌志

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.108, pp.39-46, 2003

被引用文献数

2

---

IMO (International Maritime Organization) recognized that chronic exposure to benzene vapor in air may cause leukemia even if the concentration is very low, such as a few parts per million. Chemical tankers in Japan, however, transport various kinds of chemicals over 15 (MT/year). Not only benzene but also another chemical transported by marine vessels have adverse effects to the human health condition. In this paper, firstly the exposure concentration levels of tanker crews engaged in benzene (human carcinogen) and acrylonitrile (probable human carcinogen) transport operations are clarified by results of field measurements. Using these exposure levels, the health conditions of tanker crews are evaluated by a method with LLE (Loss of Life Expectancy). Chemicals transported by tanker in Japan contain both carcinogen and non-carcinogen. The advantage using LLE is that we can compare the degree of the adverse effects induced from exposure to carcinogens and non-carcinogens. Furthermore, taking into account of the dependency of cancer risk on the start age and the duration of the exposure, we represent a simple equation for carcinogens to yield the LLE.

著者

久宗 周二

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.101, pp.253-258, 1999

被引用文献数

10 1

---

In Japan, the occurrence rate of the work accidents in the fishery industry is 8 times as high as that for all industries, so that it is necessary to study the factors relating to the works accidents in the fishery. In this study, I researched the movements of the workers on board trawl fishery, and studied the risk factors of the movements from the ergonomic point of view. I analyzed the movements, positions, traffic lines and postures of fishery workers on board the trawlers, and found out the work movements which involved different cycle times and various risks. The undesirable postures like deep bending and frequently squatting with heavy things and so forth, were always observed while at work. I extracted the most important risk factors, so that I made an operation manual to make fishing work safety. It is useful to take these factors into account in improving the work manual shout pay due these risk factors. The work manual was due to be distributed by The association for promoting safety and sanitation for seafarers to fishery companies all over the country.

著者

塩飽 朋之 Vivanda Modaso 高山 久明 清水 健一

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.130, pp.50-54, 2014 (Released:2014-07-01)

参考文献数

8

---

In the previous report, the authors examined the potential of transfer of the skill of working a Ro-scull to traditional Indonesian outrigger canoe (hereinafter just called canoe). Since the "Ro-scull" has been primarily used in traditional Japanese Wasen boat, it is difficult to apply Ro-scull directly to canoe with the hull form different from that of Wasen. The authors intended to find from image analysis the way of working a Ro-scull of canoe in comparison with Wasen and the suitable way of working that. The authors also intended to search the impact of varied skill level to work a Ro-scull on the introduction of working a Ro-scull to canoe from the comparison among testees with different skill level. In consequence, the following became apparent: (1) the motion of working a Ro-scull of canoe is smaller than that of Wasen since a testee could not plant its feet firmly on a canoe floor because of narrower breadth than Wasen; and (2) as for the difference of skill level, there was no clear distinction by testee because of the narrow range in which the blade apex of Ro-scull moved.

著者

天下井 清 木村 暢夫 甫喜本 司 岩森 利弘

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.98, pp.111-116, 1998

---

The collision of the fishing boat is occurred at high ratio. The fishing boat can not be seen from ship operator on the sea because it is small. Furthermore, it disturbs quick finding in search of fishing boat. From a point of view the authors investigated the color of the fishing boat and carried out questionnaire investigation regarding easiness of finding. As a result, it became clear that the longest distance between two colors of fishing boat and sea surface on the hue-lightness axis decided easiness of finding.

著者

Masengi Kawilarang W.Alex 柴田 恵司

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.83, pp.203-211, 1990

被引用文献数

1

---

東南アジヤ諸島部の在来型漁船(アウトリガー・カヌー)は,その両舷にアウトリガー浮木を備え,この地域における漁業の主力である。しかし,近年における推進機関の導入,あるいは,造船用材となる森林資源の減少などに伴って,その船型が変わりつつある。そこで本研究では,これらカヌーの現状,特に船型を正確に記録保存すると同時に,周辺地域における様々な小型漁船を,主要寸法と線図から求めた満載時船型諸元によって比較することにある。このため,縮尺率1/4の木製パソトグラフによって船体線図作成のための直接計測をスラゥエッシで,カヌー,20隻,西マレーシヤ東岸で,アウトリガー無しの在来型構造船6隻,さらに,沖縄県下のサバニ,6隻を計測した。そのほか,パプア・ニュー・ギニヤ(PNG)と,フィリッピンのカヌー,和船のほか,日本の近代的な小型漁船の資料を併せた合計52隻を比較検討し,東南アジヤ諸島部のカヌーの船型の特長を明らかにしようとした。これらのカヌーは,丸木作りの船底構造部の上に狭い板を積み重ねた準構造船が主で,丸木船も含まれる。その船体は,満載喫水におけるL/B=12と極めてスリムであり,その幅は,地域平均で,43〜53センチと著しく狭く,その横復元力は,全長より短い竹のアウトリガーで支えられている。また,船体はほとんど船首尾同型であるため,浮面心,浮心の前後位置は,ほぼ船体の中央にある。これらが,カヌーの特長である。なお,フィリッピンとスラゥエッシのカヌーとは船型的に近い関係にあるが,PNGのカヌーを除く,他のいずれの船とも,明らかに異なっている。

著者

井上 欣三 増田 憲司 世良 亘

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.98, pp.225-234, 1998

被引用文献数

36 6

---

A systematic analysing procedure is needed to assess the marine traffic safety in the congested and the confined water area. Three fundamental steps should be taken into account in this procedure ; (1) the evaluation of the burden due to environmental conditions, (2) the evaluation of the load due to ship manoeuvering and (3) the evaluation of the hidden risk in the ship handling process. In the present paper as the first report of this research work, a quantitative assessment model is proposed to evaluate the stress level which is burdened to mariners under the conditions of the traffic congestion and the geographical restriction. This model makes special features of (1) the capability to aggregate the geographical environment stress and the traffic environment stress by employing the same algorithm and (2) the conquest of the lack of judgement criteria whether it is acceptable or not. This will become one of advantageous models as the assessment method of the marine traffic safety.

著者

須田 建 巻島 勉 堀籠 教夫 桑島 進 大津 皓平 萩原 秀樹

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.67, pp.149-154, 1982

被引用文献数

3 1

---

In the previous report a procedure of weather routing in the North Pacific in winter is proposed, the aim of which is not to calculate the optimum route for each individual voyage but to forecast, at the time of departure of ships, the mean zonal index for the first and the last 5-day periods in any one of the three categories "high", "medium" and "low" and then to select the recommended route that is proper for the forecast index category. In this paper, the relation between the zonal index and the wave distribution in the North Pacific, which has been derived from one year's data and used as the basis of our procedure, is confirmed using data for three years. Some modification is made to the wave distribution model and the revised recommended routes corresponding to the new model are presented. Finally, the advantage of these routes is evaluated by numerical simulation.

著者

西ノ首 英之 川島 利兵衛

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.55, pp.1-6, 1976

---

昭和49年1月17日から2月28日までの東シナ海における冬季航海の以西底曳網漁船の耐航性に関する実船試験を行い次の知見を得た。(1)東シナ海の波高および漁船の操業中における船体運動の短期極値分布はレイレイ分布である。(2)波高と船体応答とのそれらの有義値の関係は回帰直線で表わされた。したがって,運動の大きさの推定はこの回帰方程式を用いて行うことが出来る。(3)一日一回定時計測された一航海の波高および船体応答の極値の自乗平均の平方根(a)の分布はワイブル分布で示された。

著者

藤澤 邦臣 村井 康二 林 祐司 前中 一介

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.124, pp.21-26, 2011

---

A pilotage is one of important factors in order to keep a safety and a security of main harbors in Japan; however, pilots' accidents sometime happen while they work. The pilots' accidents happen well for the transfer to/from the vessel/pilot boat; pilots and pilots' associations do their best for reducing the accidents under International Maritime Organization (IMO) convention. In other word, a safety measure for the transfer is the important subject for pilots. The purpose of this paper is to evaluate a pilot's physical performance while their work using large model sensors (acceleration sensors), and we read characteristics for the transfer. This research is first challenge to evaluate the pilots' performance in real situation. If their performances become clear, we will be able to tackle the new method for reducing accidents.

著者

小林 弘明 井上 欣三 新井 康夫 藤井 照久 遠藤 真 松浦 由次 遠藤 政利 阪口 泰弘

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.96, pp.119-125, 1997

被引用文献数

20

---

When the training of shiphandling techniques is provided, we always have the problems that the objective of the training is ambiguous and that the effect of the training is not clear. To imporve the above problems, authors make a proposal of a new concept that the shiphandling techniques consist of elemental techniques and verify the concept by experiments. As a result, the reasonability of the proposed concept is confirmed. Consequently, the proposed concept is found to be contribution to the efficiency and the evaluation of effectiveness of the future training.

著者

木村 隆一 鈴木 三郎 大比賀 直樹

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.79, pp.83-90, 1988

---

Horn-signal is very important for the safety navigation. When horn-signal is generated by other ship, the direction of signal-source is only judged by sense of hearing. This paper describes the system detecting the signal direction automatically. In this system, when horn-signal is received by three microphones placed in different points, time-lags occurs among the times that signal is caught by each microphones. The direction of signal-source is calculated by the time-lags. As a result, when the signal-source is as much as 1,600 meters distant from measurement place, the direction of signal-source is detected within error value of ±5 [deg].

著者

木村 隆一 鈴木 三郎 今枝 彬郎

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.83, pp.13-19, 1990

被引用文献数

1

---

Horn-signal is very important information. If the direction of signal-source can be detected by the horn-signal generated from other ship, it would be very useful for the safety navigation. This paper describes the system detecting the signal direction automatically. In this system, we consider a series of process of the sound sampling, data processing, direction detecting, as a sequential operation and examine algorithm which can quickly perform these processing by a personal computer. As a result, the detection takes time of 7 seconds each.

著者

木村 隆一 鈴木 三郎 今枝 彬郎

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.88, pp.11-18, 1993

被引用文献数

2

---

If direction of horn-signal can be detected, it would be very useful for the safety navigation. The signal which was generated by a ship (Horn-ship) was picked by three microphones placed on the compass deck of another ship (Measurement ship). A series of experiments were carried out for various distance between two ships in the range from 600 to 2000m. In this system, the signal was digitalized with an A/D converter and sent to the microcomputer, and the direction was detected using these data. The error was less than ±15[deg], but the direction could not be detected, when SPL (sound pressure level) of horn-signal was about 50dB.