著者

田丸 人意 矢吹 英雄 フォン トラン ヴェト 庄司 るり

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.115, pp.133-140, 2006

参考文献数

5

被引用文献数

1 1

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Ship owners/builders provide domestic cargo ship seafarers with little maneuverability data necessary for handling a ship in port. Thus, ship handlers maneuver the ship based on their ship handling experiences referring to the limited maneuvering data obtained at the sea trial and/or from their predecessors. The number of seafarers employed by the domestic shipping companies continues to decline and this leads to fewer opportunities of onboard OJT (On the Job Training) to master the advanced ship handling techniques such as docking. Therefore, the development of a practical maneuvering booklet for docking is desired. From this point of view, the authors conducted a simulation study to investigate the effect of wind on the stopping maneuver and accelerating turn for docking. Based on the results of the study, a method is proposed to estimate the critical range of the stopping maneuver and accelerating turn under windy condition. This paper summarizes the simulation study and proposes a practical maneuvering booklet for small domestic cargo ships.

著者

古莊 雅生

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.93, pp.35-42, 1995

参考文献数

13

被引用文献数

3 1

---

The visual perception of the targets at sea is the most important factor for safety and for a good lookout in preventing maritime traffic accidents. This study shows the conditions for being able to perceive the visible horizon between the sky and sea surface and this. Author shows the visual and nautical conditions thereof ; they are as follows; 1. The conditions of visual perception of the line of division between the sky and sea surface is that the luminance difference of the sky (about 2 degrees over horizon) and sea surface (about 2 degrees under horizon) is more than the luminance difference threshold. 2. When nobody can perceive the above line of division (horizon), the visual and nautical environment is indicated as follows; (1) The luminance of the sky (about 2 degrees over horizon) is 0.3cd/m^2. (2) The luminance of the sea surface (about 2 degrees under horizon) is 0.03cd/m^2. (3) The difference luminance threshold is 0.27cd/m^2. But in the case of 0 degree which is a relative direction towards the direction of the sun. 3. A sun altitude with above the mentioned condition is -6〜-9 degrees (1/3〜1/2 duration of astronomical twilight), which is connected with the relative direction towards the direction of the sun. 4. The luminance of the sky and sea surface and the illuminance of the sky have gone up and down with the sun's altitude, and they change rapidly and widely with the case of the time period from sunset and sunrise to -9 degrees of the sun's altitude. 5. When under way the time period from sunset and sunrise to -9 degrees of the sun's altitude is needed to keep a special caution for a good lookout and the safety of the ship.

著者

久々宮 久 小林 弘明 藤岡 善計

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.169-175, 1988-09-25 (Released:2017-01-15)

被引用文献数

2

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Lying on single anchor is a common practice for seafarers when they are to make their ship fast at an open sea room. And it is also the well known anxiety whether the anchor is effective enough to keep the ship safe at the original position in a strong wind. We calculated the motion of a ship lying on single anchor in rather a strong wind, and it is our belief that we could propose a tentative estimation method of time spared before the anchor started dragging

著者

古荘 雅生 友永 正昭 福田 忠彦 甲斐 繁利

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.97, pp.231-239, 1997

参考文献数

9

被引用文献数

1 2

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We have already reported on the characteristics of a lookout in the daytime and at night by using the eye-movement analyzer called "eye-pointer". This time, we show the remarkable points added the other new data in the twilight with the measurement of the eye-movement by the same way. The remarkable points of the characteristics of the eye-movement related a lookout of ship's operator are as follows ; 1. The extent of fixation point shown by the ellipse with the standard deviation of the fixation angle has a normal tendency being wide horizontally. But in case of the Jet-foil's navigator in the daytime and on the open sea, the extent of fixation point has a special tendency being wide vertically. 2. The average interval of fixation time at night and in the twilight is about 150msec. That in the daytime is about 60msec. On the other hand, by the average speed of sight-line displacement of the eye, the eye-movement of ship's operator is saccade movement in the daytime and in the twilight, and that is smooth pursuit movement at night. Ship's operators conduct the lookout affairs by looking and searching the obstructive targets at night and in the twilight, and by seeing them in the daytime, because of more or less of the visual informations from the ship's environment. 3. The relation every one unit observing duration (33msec) in the daytime between the average speed of sight-line displacement of the eye and the number of fixation point can be shown by the approximate formula ; Y=1827/X+31.8 (Y : the number of fixation point, X : the speed of sight-line displacement of the eye <average rate> (deg/sec), correlation coefficient : -0.82] 4. In the twilight, the average fixation time is more longer and the average speed of sight-line displacement of the eye is more faster, both than that in the daytime. So it is very difficult to catch the visual informations of the targets at sea, in the twilight, ship's operators should have special cautions for preventing ship's collision.

著者

曽我 正美

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.281-289, 1999

参考文献数

9

被引用文献数

1

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Recently there is an important trial to increase the economical potential especially in North America and EU with international cooperation. In Far Eastern area there are some opinions that it is essential for Far Eastern economy to establish the first economic free zone including China, Korea and Japan, too. So in this paper the economical evaluation is tried for the efficiency that will be enhanced by Japanese-Korean Tie-up Option on the petroleum industry as a first step. The petroleum refinery and transportation system model is developed with linear programming method. Using this model, it is discovered that some Japanese-Korean Tie-up Option will be able to get higher efficiency economically equivalent for 300〜400 million US$ a year compared with non-Tie-up condition. For this improved condition, the quantity of petroleum transportation will have to be increased to 30〜38 million KL between Japanese and Korean, too. This amount is 2.7〜3.5 times as large as the amount in 1997. So it should be understood very well that the good availability of tankers for this transportation in this area would be necessary for the efficient economic condition in future.

著者

逸見 真

出版者

Japan Institute of Navigation

雑誌

日本航海学会論文集 (ISSN:03887405)

巻号頁・発行日

vol.128, pp.111-122, 2013

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ECDIS, whose functions are to display ship's correct positions by GPS, course lines, their records, information from LADAR, ARPA, AIS, on electric charts and others, shall be said as the epoch-making navigational equipment with highly reliable and easy-to-operation, recognized by navigators. However it should be apprehensive that the characteristic of ECDIS may loss navigators' important duty of cares or norm consciousness to keep safe voyages due to it's reliable and handiness.<br>Recently, it could be said to show a marked tendency that victims and their parties committed by illegal acts strongly demand sincere apologies over legal reparation to offenders at several law cases. Victims' demands must be not only apologies but also explanations for understanding of causes or reasons in accidents. Navigators could confront to the above demands as a litigant at maritime accidents, so that they must do sincere actions which shall be established by navigators' autonomy to realize and behave duty of cares or norm consciousness.<br>The objective of these papers is to examine how to cultivate navigators' autonomy against the above problems due to navigational equipment developed. At first, it is explained that functions of ECDIS may make navigator's excessive trust in the equipment and make the said duties lost from navigators. Next, author should say the navigators' important accountability against legal and moral liabilities, and try to present ideas, applied ethics and law education for instance, to cultivate their autonomy finally.

著者

桑島 進 萩原 秀樹 岩坂 直人

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.94, pp.219-230, 1996

参考文献数

6

被引用文献数

4 1

---

A FDR (flight data recorder) of air plane is well known to be a useful instrument to review a flight especially in the case of accidents. But the ship does not have such a useful recorder. That is the reason why such recorder was not essential for ship to merely sail and moreover many sensors to measure phenomena in ocean were not developed yet. But recently an occasion of the accident of Ro-Ro passenger ship [Estonia] in Baltic Sea, the requirement of VDR (Voyage Data Recorder) is on the rise in all over the world. So, we tried to develop VDR with up-to-date sensor and computer techniques. At first we formed a clear conception of VDR with reference to FDR and other recorders. Then concerning about wish of use and desirable function of VDR, we asked intention of users who are in various field of industry including shipping Co. using the questionnaire method. And finally we proposed a modern VDR with many suitable functions for each user based on our own concept.

著者

岡山 正人

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:21873275)

巻号頁・発行日

vol.124, pp.371-379, 2011-03-25 (Released:2017-01-15)

被引用文献数

2

著者

坂井 丈泰 惟村 和宣 長岡 栄 高橋 美登里 天井 治

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.33-41, 1998

参考文献数

9

被引用文献数

2 1

---

For a precision approach and landing system of aircraft using GPS, it is nessessary to improve the system performance such as positioning accuracy, integrity, continuity and availability. A possible way for improving the performance may be to use pseudolites (pseudo-satellites) located on the ground near airport in addition to ordinally GPS satellites. In this paper, a qualitative simulation was carried out for evaluating positioning accuracy for the approaching aircraft using pseudolites together with the existing GPS satellites. Flight experimental data and artificial data on ranging measurement were used for the simulation. The result shows that while the positioning accuracy strongly depends on relative location of pseudolites, GPS satellites and the aircraft, the accuracy can be improved by the utilization of pseudolites.

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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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.