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原稿種別: 表紙
2008 年 119 巻 p.
Cover1-
発行日: 2008/09/25
公開日: 2017/01/15
ジャーナル
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原稿種別: 付録等
2008 年 119 巻 p.
App1-
発行日: 2008/09/25
公開日: 2017/01/15
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原稿種別: 付録等
2008 年 119 巻 p.
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発行日: 2008/09/25
公開日: 2017/01/15
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原稿種別: 目次
2008 年 119 巻 p.
Toc1-
発行日: 2008/09/25
公開日: 2017/01/15
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原稿種別: 目次
2008 年 119 巻 p.
Toc2-
発行日: 2008/09/25
公開日: 2017/01/15
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Minh Duc NGUYEN, Hitoi TAMARU
原稿種別: 本文
2008 年 119 巻 p.
1-7
発行日: 2008/09/25
公開日: 2017/01/15
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Marine traffic observation is vitally important for congested water with special geographical characteristics like Tokyo bay. Therefore, the study aims at introducing an approach of automatic radar tracking with better accuracy and efficiency, and a method of using AIS data as supplement to improve the stability, quality of auto-tracking. To reach the targets, a Relating-Function is suggested. The tracking results are later compared with manual tracking results to ensure the accuracy and prove to be promising. Approach with supplementing AIS data would be very useful as requirements for carrying class B AIS are coming into effects.
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El Hocine TASSEDA, Hitoi TAMARU
原稿種別: 本文
2008 年 119 巻 p.
9-17
発行日: 2008/09/25
公開日: 2017/01/15
ジャーナル
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The rapid pace of technological development, the growing maritime traffic, the growing fishing industry, and the limitations and constraints imposed by nature make the imperative to develop a radical new approach to the traditional maritime traffic and aids to navigation management systems in order not to be superseded. This paper investigates the feasibility of a Space-Time based Dynamic Traffic Management System that can evolve within itself to manage the growing traffic and aids to navigation, using Virtual and Synthetic AtoN AIS system technology. The authors build an AIS Marine Traffic Database for Tokyo Bay (May 16th-October 7th 2007), using actual dynamic data provided by ships, and static data provided by a commercially built database. After simulating part of the data (16-31 May 2007) in Uraga Suido Traffic Route, two Time Gates (04h00-08h00, 17h00-24h00) and a Dynamic Zone (width=250m) are determined. The proposed Dynamic Traffic Management System reduced the marine traffic density (Mean and Maximum values) by around 21% for both north and south bound lanes. As for the future research the study will be expanded to cover all available data, and include other parameters in assessing the Time Gates and the width of the Dynamic Zone.
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横井 威, 田丸 人意, 高嶋 恭子
原稿種別: 本文
2008 年 119 巻 p.
19-26
発行日: 2008/09/25
公開日: 2017/01/15
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During the last decade, the effect of optimal routing decision has been proven by Weather Routing. Provided with precise environmental forecast and real datasets, the simulation results of weather routing have brought many profits such as minimum fuel route and minimum time route. However the datasets indispensable for the simulations are provided by a single organization with a fixed resolution in a limited sea area and at high-cost. Furthermore, obtaining those datasets becomes the bottleneck to improve the efficiency of the weather routing service. In this paper, we propose architecture and a framework based on the OPeNDAP protocol for providing a transparent access to the distributed online oceanographic and meteorological datasets over the WAN. In addition, the data management methods allow rapid data archiving and deployment. Finally, we showed that an optimal route could be successfully decided by using the proposed mechanism with a isochrone weather routing.
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瀬田 広明, 鈴木 治, 鈴木 秀司, 天野 宏
原稿種別: 本文
2008 年 119 巻 p.
27-33
発行日: 2008/09/25
公開日: 2017/01/15
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This paper shows the way how to collect the other ship's information with a text file by using AIS, ARPA and DGPS. The way to collect it is to receive NMEA sentences which are output from the nautical instruments and to mix them. The movement information, on ships which were not located AIS, are generated by the information of ARPA and DGPS. This system is made by using ship nautical instruments loaded with ordinary ships. So we verified the validity of this system, which was made in this research, by using T.S. "TOBAMARU" in Toba national college of maritime technology. This verification is held by fixed point observation at Irago Channel and assessment on own ship's difficulties during the navigating. As a result we can know these facts as follows: 1. The movement information on ships over 20 tons whether they loaded AIS or not by adjusting gain of radar can be easily picked out. 2. Our own ship's difficulties at a real time by using Enviroment Stress model during the navigating can be also assessed.
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大西 貴希, 鈴木 治, 山下 勝博, 三好 敏夫
原稿種別: 本文
2008 年 119 巻 p.
35-41
発行日: 2008/09/25
公開日: 2017/01/15
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An onboard marine clock is adjusted every day. A master clock shall be matched standard time by the radio rule. The adjustment is performed by manual operation at the time and these works are the duty of deck officer. The GPS receiver shall be include ocean going vessel. Network Time Protocol (NTP) uses the GPS time information. It can use shipboard LAN. The author designed the 40kHz radio transmitter for radio controlled clock and the program code of ship's time for the Unix embedded microcomputer. The accuracy of NTP server is efficient for shipboard LAN and the marine master clock and slave clocks. The transmitter for the radio clock onboard deliver the time information to the ordinary radio controlled clock within few meters. The authors installed some above integrated functions of the marine master clock to embedded computer. Finally, the generated time code can set some general radio controlled clocks by any ship's hour.
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Mingyang Pan, Masaaki Inaishi, Akira Kawaguchi
原稿種別: 本文
2008 年 119 巻 p.
43-49
発行日: 2008/09/25
公開日: 2017/01/15
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This paper describes an improvement made for the expressive capabilities of the ship cluster behavior model. The goal of this study is to realize a pseudo realistic marine traffic flow analysis in the complex sea environment. The approach is based on the development of the proactive means capable of detecting obstacles and assisting safe group navigation. Specifically, two enhancements so called strategic navigation planning in a global computation phase and tactical obstacle avoidance in a local computation phase are applied to the ship cluster behavior model. The validity of the enhanced ship cluster behavior model is evaluated using computer simulations in artificially generated geographic environments. The results confirm the model's strong abilities in supporting complex traffic flow simulations. A series of experiments are also performed for the navigation of Tokyo Bay to investigate the formation of the traffic flow under varying conditions of geographic features.
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酒出 昌寿, 井上 欣三, 世良 亘, 本村 紘治郎
原稿種別: 本文
2008 年 119 巻 p.
51-58
発行日: 2008/09/25
公開日: 2017/01/15
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The bisan-seto sea area is not only an important marine transportation hub but also a good fishing ground. The stownet fishery is operated energetically in the bisan-seto sea area. Its main fishing grounds conflict with legal traffic routes. Ship's operators and fishermen have discussed this conflict problem, still they don't have sufficient solution yet. It is necessary for sufficient solution of this conflict problem to approach this problem by a new investigation method. In this study, we have researched their conflict condition. And also, we have examined evaluating the difficulty of ship-handling by avoiding stownet fishing boats and the difficulty of operating stownet fishery in the legal traffic routes through the environmental stress model. Then, we have discussed possibility of evaluating them by the environmental stress model.
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邢 向輝, 井上 欣三, 臼井 英夫, 世良 亘
原稿種別: 本文
2008 年 119 巻 p.
59-65
発行日: 2008/09/25
公開日: 2017/01/15
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There are many of straits and channels near the Japanese coast. Navigating at these kinds of restricted and congested water-areas, it is more difficult for mariners to handle the ship at nighttime than at daytime. This research aims at studying on the reduction of ship-handling difficulty in the channel due to nighttime. In this paper, on the base of our past study on the difference of mariner's perception of safety (when approaching to a shore and encountering with other ship) at daytime and nighttime, the nighttime version of Environmental Stress Model was made, and using this new model, the difficulty of ship handling at nighttime is evaluated quantitatively. In order to evaluate comparatively the ship-handling difficulty at daytime and nighttime in the straight channels with different width, the marine traffic simulation was carried out. About the simulation, two kinds of traffic flow were considered: one-way and two-way. Based on the result of simulation, the ship-handling difficulty at daytime and nighttime was calculated, and the measures to reduce the ship-handling difficulty at nighttime was analyzed from the aspects of 1) Slowdown, 2) Reduce the congestion of marine traffic, 3) Extend the width of channel.
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浦上 美佐子, 丹羽 康之, 本木 久也, 松野 浩嗣
原稿種別: 本文
2008 年 119 巻 p.
67-74
発行日: 2008/09/25
公開日: 2017/01/15
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Recently, an increase in small craft sea accidents has been reported and a lack of experience of crews on the small craft obstructs quickly reacting to an accident. Thus, it becomes more important to tighten safety measures for the navigation of the small craft. If such small crafts have the equipment for common communication with base stations on land or with other crafts, it will be great support for the crew. This paper proposes the common communication method using wireless LAN system to safety support to navigating of the small craft. We investigate the effectiveness of the wireless communications using the proposed network constructed on the Seto Inland Sea. In particular, we evaluate a network quality between two ships by three approach situations: on the same course, crossing, and meeting, and by two antennas. The kinds of the gain of antenna are each 3dBi and 6dBi. The experiment shows that the network quality affects the distance between two ships rather than the kinds of courses, and we obtain enough network quality on the sea. Thus, it is possible to build applications which support to navigate small craft safely by the use of the communication band width obtained by these experiments.
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若林 伸和, 原田 寿里, 小林 英一, 庄司 るり
原稿種別: 本文
2008 年 119 巻 p.
75-82
発行日: 2008/09/25
公開日: 2017/01/15
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Nowadays, navigation systems like ECDIS became popular on board, so the target data acquired by ARPA and AIS are widely used in decision making for safe navigation. Because it is important for users to get the information easily and accurately, display method on ENC image of navigation system should be designed carefully. Although the standard of notation to display target information have been established, it seems that there are some issues to discuss, especially in user-friendliness. In this paper, we propose more efficient notation to display target data on navigation system in general.
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Chia-Hung SHIH, Nobukazu WAKABAYASHI, Saburo YAMAMURA, Juri HARADA
原稿種別: 本文
2008 年 119 巻 p.
83-89
発行日: 2008/09/25
公開日: 2017/01/15
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フリー
Nowadays, data storage methods have been gone in the direction of integration with the internet structure. One of the most popularized data storage technologies is relational database. In the contrast, along with the coming of Business to Business (B2B) generation, the tendency of using Entensible Markup Language (XML) document as data exchange format recently becomes more and more evident. XML data model could be a better or suitable solution for the maritime field because ships offshore are not able to access or update database through the internet in real time. Compared with relational database, XML has the semantic advantage. This characteristic allows it to communicate with servers and to achieve the objective of automatic operations. On the other hand, because XML is built in pure text format, compared with the binary structure of database, XML takes more data storage space and has obvious backward query efficiency. In our research, in order to reduce the disadvantage of XML essence, the data storage structure for ship data modeling is investigated from query efficiency view and we apply this data model on the container operation as a sample to verify the improvement of query efficiency.
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新保 雅俊, 周 立輝, 山本 茂広
原稿種別: 本文
2008 年 119 巻 p.
91-97
発行日: 2008/09/25
公開日: 2017/01/15
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The significant cause of the ship collision is "Insufficient Lookout". This paper proposes an image processing method for lookout support at sea. The method detects other ships through a navigational image sequence taken by cameras installed at ship's bridge. A frame is segmented into regions. Regions that presumed to be ships are labeled. On the other hand, the optical flow of frame is estimated by Lucas-Kanade method (LKM) that is high-speed version of two-frame differential method. And the pixels that move linearly are selected by inner product. Ships regions are detected by integration with labeled regions and pixels that move linearly. We inspected an effect of proposed method using marine images shot in Tokyo Bay.
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塩谷 茂明, 溝下 和裕, 土橋 保, 久野 真之
原稿種別: 本文
2008 年 119 巻 p.
99-107
発行日: 2008/09/25
公開日: 2017/01/15
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This paper deals with the substantial examination of ship waves generated by tug boats in port of Kobe. Such examination is very important because the ship waves generated by tug boats react to many smalls vessels sailing and operating in the port. The tug boats having the high power engine generate the larger ship waves than other sailing ships in the port and the small vessels are endangered by the waves. It was confirmed that the substantial examination of the ship waves generated by tug boats in port of Kobe became evidently.
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久保 雅義, 竹田 昇史, 岩本 雄二, 榊原 繁樹
原稿種別: 本文
2008 年 119 巻 p.
109-118
発行日: 2008/09/25
公開日: 2017/01/15
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In our previous study, we proposed the numerical simulation procedure of moored ship motions induced by tsunami, and investigated the effects on ship motions and mooring loads, considering berth location, ship's dimension and mooring system. In some cases, large ship movements beyond the safe mooring conditions were induced by the surface elevation, the currents and a resonance effect with natural periods of sway or surge of the moored ships. In the proposed method, the calculated horizontal currents were not able to be reproduced well, compared with those by the tsunami simulation directly. In this paper, we investigate the difference of the currents, and improve the accuracy of the connection between the tsunami simulation and the simulation of the moored ship motions.
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木村 安宏, 山下 真史, 湯田 紀男
原稿種別: 本文
2008 年 119 巻 p.
119-127
発行日: 2008/09/25
公開日: 2017/01/15
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Recently the ship equipped with Schilling rudder is increase. Generally, the Schilling rudder is the fish-shape section with end-plates and provides high lift performance. The Schilling rudder shows higher handling performance than the normal one, especially in berthing controls. In the previous paper, it was confirmed through experiments that the Schilling rudder provides high-capacity lift. However, the mechanism bringing strong lift force even in large rudder angle is not entirely studied yet. To understanding the above mechanism will be useful for navigators, shipbuilders and marine engineers. In this paper, to examine the above mentioned mechanism more practically, research the relation between hydrodynamic forces and the shape of rudder tail part of the fish-shape section was done through measurement experiments and numerical calculations. Especially, the influence of the shape of rudder tail part on characteristics of the high lift force of the rudder is explained by using the obtained results. From measured and calculated results, for example it is shown that the tail-edge thickness of the rudder obtaining the maximum lift force can be found out.
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Linjia YANG, Kinzo INOUE, Hiroyuki SADAKANE
原稿種別: 本文
2008 年 119 巻 p.
129-136
発行日: 2008/09/25
公開日: 2017/01/15
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The reduction of the braking capability of tugboats under ship-tugboat hydrodynamic interaction was confirmed in the previous paper relying on scale model experiment results. The ship-tugboat hydrodynamic interaction was mainly caused by tugboat's propeller stream and wake of the assisted ship. Since the interference component of the ship-tugboat hydrodynamic interaction receives the influence of Reynolds number, the influence of scale effects on the effective braking force of tugboats under ship-tugboat hydrodynamic interaction has to be considered further. In this study. The effective braking force is approached by dividing ship-tugboat interaction into two interference components, namely on the tugboat's braking force in ship's wake and on ship's hull resistance. First, the interference component on the tugboat's braking force is predicted considering the scale effect of ship's wake velocity distribution, and using the braking force coefficient of tugboat-self in the uniform flow. Next, the interference component on ship's hull resistance is also estimated under an assumption, which this component in full scale ship is in proportion to Schlichting's frictional resistance as the component obtained in scale model experiments being a constant. Finally, the effective braking force for full scale tugboats was predicted by using the experiment data and the assumptions mentioned above.
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渕 真輝, 藤本 昌志, 臼井 伸之介, 岩崎 裕行
原稿種別: 本文
2008 年 119 巻 p.
137-143
発行日: 2008/09/25
公開日: 2017/01/15
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There are no defined criteria to decide the time of action for avoiding collisions according to the COLREGS due to the characteristics of sea traffic. However, it has been pointed out that the difference of the time to take action by both vessels sometimes leads to collisions or near-misses. COLREGS defines the give-way vessel and the stand-on vessel by applying rules to vessels in sight of one another. The action by the give-way vessel is just to take early and substantial action to keep well clear. In contrast, two actions are specified for the stand-on vessel. The first is to keep course and speed, and the second is to avoid a collision when the give-way vessel is not taking appropriate action. In this study, we focused on the stand-on vessel, and investigated the time of action taken by students and person with sea experience using a questionnaire. The result demonstrated that students who complete a sea training tend to judge the time for action earlier and more consistently than university students and person with sea experience. The results also exhibited no differences between university students and person with experience. The time of action taken by the stand-on vessel was discussed, and the need for further training and education about the time of action necessary to avoid a collision was pointed out.
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高嶋 恭子, 加納 敏幸, 小林 充
原稿種別: 本文
2008 年 119 巻 p.
145-151
発行日: 2008/09/25
公開日: 2017/01/15
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Following predetermined voyage plans is of the utmost importance for coastal shipping. Generally, coastal ships are operated slightly ahead of schedule to keep sufficient room for avoiding any risk of arrival delay. If the standard deviation of arrival time error on the recommended route can be estimated, it is possible to follow the ship operation schedule and save a large amount of fuel. From the above point of view, the authors propose a new weather routing algorithm that takes the "risk of delay" concept into account. In the proposed algorithm, the standard deviation of the error of arrival time is estimated using information on the accuracy of wind/wave forecast. Our simulation results confirmed that the standard deviation of the arrival time error on the minimum fuel route can be accurately estimated, reducing the risk of delay of arrival time.
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林 祐司, 村井 康二
原稿種別: 本文
2008 年 119 巻 p.
153-160
発行日: 2008/09/25
公開日: 2017/01/15
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The Japanese maritime industry has been transformed to a smaller size; fewer Japanese seafarers and more non-Japanese flag carriers since 1985. This transformation has led to today a lack of Japanese pilots, and the lack of them is the first to appear in Japan. At the same time, Japan's Ministry of Land, Infrastructure and Transport started a new pilot education and training courses from beginning April, 2007. On the other hand, a few researchers had published their papers about pilots and pilot systems in Japan. It is obvious that the pilot system has been sustaining Japanese economy. The Japanese pilot system is changing within one decade, so it is necessary for us to study about pilots and their systems. The purpose of this paper is to study about occurrence tendency of pilots' collision incidents in Japan, especially for the Kanmon Pilot District. At first step, we focus the district and divide it nine zones and four lanes for plotting the position of those incidents. We count plotted points for each zone and lane. Of special focus are current directions and ships situations between two collided ships. We propose how to divide the Kanmon Pilot District and how to study occurrence tendency of pilots' collision incidents in the district.
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川崎 潤二, 奥田 邦晴, 下川 伸也, 濱口 正人
原稿種別: 本文
2008 年 119 巻 p.
161-167
発行日: 2008/09/25
公開日: 2017/01/15
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To investigate working environments of fishing boat, it is necessary to establish the technical guideline to evaluate the work load and its environmental factor under the fishing operation. Works on the deck for fishing operation are carried out by work line and process along with the time passage. The purpose of this paper is to recognize the effectiveness of time study for quantity of work on the deck. Based on the research of the offshore and coastal fishing boat, the characteristics of working environments of fishing boat could be considered and the relationship between particular aspects of working environments and the work load could be examed by time study.
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畑中 勝守, 和田 雅昭, 戸田 真志
原稿種別: 本文
2008 年 119 巻 p.
169-177
発行日: 2008/09/25
公開日: 2017/01/15
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Despite the significance of the geologic map of seabed classification, geological survey using high resolution side-scan sonar is not widely utilized in fisheries due to its high cost. Therefore a new algorithm for the analysis of echo sounder data measured by quantitative echo-sounders is presented in this paper so that it can be applicable to the seabed classification to make geologic maps in fisheries. The present algorithm is based on the Discrete Wavelet Transform in the analysis of reflections to draw out significant differences among different textures or materials on the seabed from their waveforms. In this paper, the development of the present algorithm is described using data obtained by two experiments carried out on the coasts of Hokkaido and Okinawa using quantitative echo-sounders. The results show that the present method can classify sand and silt seabed from others by the maximum values of wavelet power on a low frequency level in the discrete wavelet analysis and show that the present algorithm is applicable to the seabed classification for the creation of geologic maps in fisheries.
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Thanh Thuy NGUYEN, Etsuko NISHIMURA, Akio IMAI
原稿種別: 本文
2008 年 119 巻 p.
179-189
発行日: 2008/09/25
公開日: 2017/01/15
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Container is a standard in worldwide transportation method, which is capable of being moved by sea, road or rail with relative simplicity. Due to the continuously increasing container trade, many container terminals as well as liner shipping companies are presently frustrating to shorten the turnaround time of a ship for financial savings. Therefore, any methods to improve the containership stowage process would be significant. This paper examines the effectiveness of container arrangements in order to evaluate how to optimize the stowage plan, which was established at the present port and associated with the unloading plan at next port. The efficient of the ship stowage plan is evaluated by the minimum number of rehandled container required and the maximum value of ship stability obtained during to trip from the present port to the next port. The genetic algorithm is employed as a heuristic for the approximately optimized solutions and the validation of the proposed approach is performed with some computational experiments.
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長畑 司
原稿種別: 本文
2008 年 119 巻 p.
191-197
発行日: 2008/09/25
公開日: 2017/01/15
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This report describes a rating method in vessel's navigational self-completion ability and rescue-aid ability by estimated cost after the occurrence of marine accidents or later, and the time series trends and characteristics on and after 1952 according to the index and the rate of self-completion or rescue-aid, which are based on numerical computation that uses statistical data of the Marine Accidents Requiring Rescue in Japan. This method consists of five kinds of cost, self-salvage, rescue-aid, loss or missing, and the participable equivalence quantity of self-salvage or rescue-aid in a related portion of loss or missing. These evaluation indices and rates suggest that the self-completion ability of vessel's cargo is increasing, but the other self-completion ability and all of rescue-aid abilities are not increasing. And also, all values in unit evaluation per one gross tonnage are accentuated except cargo's ability for about 50 years.
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海老沼 拓史, 安田 明生
原稿種別: 本文
2008 年 119 巻 p.
199-204
発行日: 2008/09/25
公開日: 2017/01/15
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This work is intended to develop a Global Positioning System (GPS) receiver specifically designed to process reflected GPS signals off the ocean surface for purpose of ocean altimetry. The goal is to develop a miniaturized GPS sensor allowing for carrying on small platforms, including high-altitude balloons, remote controlled aircraft, and even small satellites flying high above the ocean and capturing the reflected GPS signals during the flight. The prototype receiver consists of only two parts: A pair of GPS RF front-ends provides Intermediate Frequency (IF) digital samples of direct and reflected GPS signals, and a high-speed USB interface that transfers the sampled data to a host PC for post-processing. A preliminary test was performed at the Aioi Bridge over the Sumida River. The RF front-ends were connected to two antennas; one of them pointing to the zenith for direct signal reception, and the other pointing the river surface for collection of the reflected signals. The altimetry results showed that the developed GPS sensor was capable of providing an averaged height error of better than one meter.
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伊勢嶋 潤, 高須 知二, 海老沼 拓史, 安田 明生
原稿種別: 本文
2008 年 119 巻 p.
205-211
発行日: 2008/09/25
公開日: 2017/01/15
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Real-time kinematic (RTK) GPS is a technique which allows a mobile user to measure its position with a cm-level precision in real-time by using carrier-phase differential corrections of reference stations. The RTK technique has found a number of industrial applications in the various areas. One of the problems of the RTK-GPS positioning is communication delay between the rover receiver and the reference station. The RTK-GPS system generally requires a continuous wireless transmission link to transmit raw observation data or correction messages from the reference station to the remote rover. Recently, the RTK-GPS has been applied to precise navigation of mobile platforms such as cars or aircrafts. One of the problems in such mobile application environment is communication delay. In this paper, we proposed new methods to correct satellite clock bias and ionospheric delay errors caused by the communication delay. In order to evaluate the proposed methods, we investigated fix rates and positioning accuracy in the existence of up to 30-second communication delay in several baseline lengths.
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福田 厳, 林 尚吾
原稿種別: 本文
2008 年 119 巻 p.
213-220
発行日: 2008/09/25
公開日: 2017/01/15
ジャーナル
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The present paper shows a basic research for Inertial Navigation equipment using MEMS (Micro Electro Mechanical Systems) sensors. Usually, GPS is used for setting a ship's position. Gyro compass and magnet compass are used for deciding ship's heading. According to the recent technological innovation, an inertial navigation system has potential to be the next navigation equipment for ships. One of most exciting technical advancement is MEMS sensors. MEMS devices overcome many of the features that have impended the adoption of inertial systems by many potential applications, especially where cost, size and power consumption have been governing parameters. It is concluded that it would be possible to make autonomous system using only MEMS sensors.
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平畠 英隆, 林 尚吾
原稿種別: 本文
2008 年 119 巻 p.
221-226
発行日: 2008/09/25
公開日: 2017/01/15
ジャーナル
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To decrease collision disaster, authors examined early detecting of small boats with the enhancement of an Electrical Visualization. Most small boats are made by FRP, but there is few observation on its radar cross section. The authors measured Radar Cross Section (RCS) of small boats. As results, RCS of boats of less than 5 G/T was 6m^2 and RCS of bigger boats was 15m^2. The RCS is not so small, however in actually, it is difficult to detect these small boats by radar. The authors thought that it was difficult to detect small boats even if small radar reflector was installed for them, because big radar reflector is not suitable for them. So the authors make a proposal of a radar transponder operating at out-band of radar frequency band with small output power using solar power cell, communication system and network.
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福浜 拓郎, 秋本 剛志, 辰己 公朗
原稿種別: 本文
2008 年 119 巻 p.
227-237
発行日: 2008/09/25
公開日: 2017/01/15
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For the correction of the students' radar plotting analyzing results in the radar plotting training in this college, if there is any incorrect answer in the analyzing process, the instructor will strictly examine the incorrect parts and search for the cause from the value and diagram. He/She will then give the student the feedback of the analyzed data. However, the current method is proved to be extending the training time dramatically. Therefore, in order to make the correction more efficiently, I have done a few studies on the correction supporting system. Besides that, I have also used a prototype system to confirm its effectiveness. The outline of this system is it digitalized the radar plotting sheet, which the answer was written on it, by scanner and have the computer support the examination of the answer. We have launched a few tests on the system to find out its effectiveness. For the result, the time for correction is 20 seconds/piece, and the accuracy is 100%. Although human being need only 20 seconds to analyze a piece too, they need around 10 minutes to analyze the cause for a single piece of radar plotting analyzing result. From the situation above, we know that this system have the ability to analyze the result as fast as human being or even faster than human beings from the test. Therefore, its effectiveness is proved.
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辰己 公朗, 河口 信義, 久保田 崇, 新井 康夫
原稿種別: 本文
2008 年 119 巻 p.
239-247
発行日: 2008/09/25
公開日: 2017/01/15
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The purpose of our study is to evaluate the adaptation of Velocity Information by GPS (VI-GPS) to docking and anchoring. This evaluation is to prove that the effectiveness of VI-GPS is the same or even higher compared to the Speed and Distance Measurement Equipment (SDME) in docking and anchoring. The experiments to survey the static and dynamic performances of velocity information by Kinematic GPS (K-GPS) and VI-GPS were carried out on land, while the experiments to survey 3-D velocities of large vessel such as ferryboat and small vessel such as training ship were carried out onboard. Consequently from these experimental results, it was shown that VI-GPS is going to be a good instrument offering navigator better velocity information than the conventional SDME and/or K-GPS.
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住谷 美登里, 福島 幸子, 福田 豊
原稿種別: 本文
2008 年 119 巻 p.
249-256
発行日: 2008/09/25
公開日: 2017/01/15
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ATFM (Air Traffic Flow Management) is introduced for safe and effective flight at each sector and to satisfy demand for air traffic increase. ATFM is conducted by "traffic management index" that represents a controller workload. This paper describes the relationship traffic conditions and the index based on parameter of controller workload at 15 sectors. The definition of parameter was based on the measurement, analysis and classification of the controller's task of each aircraft. It is time consuming to analyze controller's task. Therefore, this paper proposes improved method that provides an index for ATFM without analyzing the controller's tasks. We propose methods for index based on the number of proximity aircraft. Then, the close relationship between the proposed index and the current index has been shown.
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今里 元信, 桐谷 伸夫, 麻生 裕司, 松下 邦幸
原稿種別: 本文
2008 年 119 巻 p.
257-262
発行日: 2008/09/25
公開日: 2017/01/15
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There is a need for the sensing system of unidentified boats near important coastal facilities for early warning. In this paper, we describe the automatic estimation method of the direction for sound source on the water by the phase difference from sensing underwater sound. The validity of the phase difference method is shown by comparison to geometric direction. In the procedure for the estimation of direction, the automatic noise filtering process is used with considering the properties of ship's underwater sound. We expect that the watching buoy system will be useful to estimate the direction of a dubious ship and a poaching boat from sensing underwater sound.
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原稿種別: 付録等
2008 年 119 巻 p.
App3-
発行日: 2008/09/25
公開日: 2017/01/15
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原稿種別: 付録等
2008 年 119 巻 p.
App4-
発行日: 2008/09/25
公開日: 2017/01/15
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原稿種別: 付録等
2008 年 119 巻 p.
App5-
発行日: 2008/09/25
公開日: 2017/01/15
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原稿種別: 付録等
2008 年 119 巻 p.
App6-
発行日: 2008/09/25
公開日: 2017/01/15
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原稿種別: 表紙
2008 年 119 巻 p.
Cover2-
発行日: 2008/09/25
公開日: 2017/01/15
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