Research activity information

• Jun. 2024 総務省近畿総合通信局, 「電波の日」近畿総合通信局長表彰, 海難防止を目的として設けた「 9GHz帯小型船舶用固体素子レーダーの規制緩和拡充に関する調査検討会」の座長を務め小型船舶へのレーダーの普及を促進するための技術基準の策定

  若林伸和


• Dec. 2018 住田正一海事奨励賞, 著書「詳説 航海計器」に対して

  若林 伸和

• A Data Compression Approach to Reducing Demands on Maritime Communication Systems

  Nikola Lopac, Irena Jurdana, Nobukazu Wakabayashi, Hongze Liu

  May 2023, 16th Baška GNSS Conference: Technologies, Techniques and Applications Across PNT and The 3rd Workshop on Smart, Blue and Green Maritime TechnologiesAt: Baška, Croatia

  [Refereed]


• RedNavi: Building a 3D Scene of the Current Sea from AIS Data

  Hongze Liu, Nobukazu Wakabayashi

  Last, Oct. 2022, Sustainability 2022, 14(19) (19), 12572, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Application of Advanced Digital Technologies for AIS Data Utilization

  Nikola Lopac, Irena Jurdana, Nobukazu Wakabayashi, Hongzie Liu

  May 2022, 15th Baška GNSS Conference: Technologies, Techniques and Applications Across PNT and The 2nd Workshop on Smart, Blue and Green Maritime TechnologiesAt: Baška, Croatia

  [Refereed]


• BlueNavi: A Microservices Architecture-Styled Platform Providing Maritime Information

  Hongze Liu, Irena Jurdana, Nikola Lopac, Nobukazu Wakabayashi

  Last, Feb. 2022, SUSTAINABILITY, 14(4) (4), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Shipboard Data Compression Method for Sustainable Real-Time Maritime Communication in Remote Voyage Monitoring of Autonomous Ships

  Irena Jurdana, Nikola Lopac, Nobukazu Wakabayashi, Hongze Liu

  Due to the ever-increasing amount of data collected and the requirements for the rapid and reliable exchange of information across many interconnected communication devices, land-based communications networks are experiencing continuous progress and improvement of existing infrastructures. However, maritime communications are still characterized by slow communication speeds and limited communication capacity, despite a similar trend of increasing demand for information exchange. These limitations are particularly evident in digital data exchange, which is still limited to relatively slow and expensive narrowband satellite transmission. Furthermore, with the increasing digitalization of ships and introducing the sustainable concept of autonomous ship operation, large amounts of collected data need to be transmitted in real-time to enable remote voyage monitoring and control, putting additional pressure on the already strained means of maritime communications. In this paper, an adaptive shipboard data compression method based on differential binary encoding is proposed for real-time maritime data transmission. The proposed approach is verified on the actual data collected on board a training ship equipped with the latest data acquisition system. The obtained results show that the proposed data encoding method efficiently reduces the transmitted data size to an average of 3.4% of the original shipboard data, thus significantly reducing the required data transmission rate. Moreover, the proposed method outperforms several other tested competing methods for shipboard data encoding by up to 69.6% in terms of compression efficiency. Therefore, this study suggests that the proposed data compression approach can be a viable and efficient solution for transmitting large amounts of digital shipboard data in sustainable maritime real-time communications.

  MDPI AG, Jul. 2021, Sustainability, 13(15) (15), 8264 - 8264, English

  [Refereed][Invited]

  Scientific journal


• Particle-Swarm-Optimization-Enhanced Radial-Basis-Function-Kernel-Based Adaptive Filtering Applied to Maritime Data

  Nikola Lopac, Irena Jurdana, Jonatan Lerga, Nobukazu Wakabayashi

  The real-life signals captured by different measurement systems (such as modern maritime transport characterized by challenging and varying operating conditions) are often subject to various types of noise and other external factors in the data collection and transmission processes. Therefore, the filtering algorithms are required to reduce the noise level in measured signals, thus enabling more efficient extraction of useful information. This paper proposes a locally-adaptive filtering algorithm based on the radial basis function (RBF) kernel smoother with variable width. The kernel width is calculated using the asymmetrical combined-window relative intersection of confidence intervals (RICI) algorithm, whose parameters are adjusted by applying the particle swarm optimization (PSO) based procedure. The proposed RBF-RICI algorithm’s filtering performances are analyzed on several simulated, synthetic noisy signals, showing its efficiency in noise suppression and filtering error reduction. Moreover, compared to the competing filtering algorithms, the proposed algorithm provides better or competitive filtering performance in most considered test cases. Finally, the proposed algorithm is applied to the noisy measured maritime data, proving to be a possible solution for a successful practical application in data filtering in maritime transport and other sectors.

  Last, MDPI AG, Apr. 2021, Journal of Marine Science and Engineering, 9(4) (4), 439 - 439, English

  [Refereed]

  Scientific journal


• The Development of a Route Generation Procedure Incorporating Collision Avoidance Applicable to Automatic Maneuvering, - The Effective Utilization of Collision Avoidance Polygons -

  Nobukazu Wakabayashi, Irena Jurdana, Tatsuya Yashiro

  Lead, Oct. 2020, The 30th International Offshore and Polar Engineering Conference, ISOPE 2020, 3551 - 3557, English

  [Refereed]

  International conference proceedings


• Marine Fiber Optic and Spinning Mass Gyrocompasses

  A. Škrobonja, I. Jurdana, I. Panić, N. Wakabayashi

  Last, Sep. 2020, 43rd international convention on information, communication and electronic technology, English

  [Refereed]

  International conference proceedings


• Maritime Communications and Remote Voyage Monitoring

  Nobukazu Wakabayashi, Irena Jurdana

  Lead, Jul. 2020, Proceedings of the 2020 CoBCom - International Conference on Broadband Communications for Next Generation Networks and Multimedia Applications, 116 - 123, English

  [Refereed]

  International conference proceedings


• On Time-Frequency Characteristics of Fluctuation for Main Engine Rotation Speed in Rough Seas

  Daisuke Terada, Kenji Sasa, Nobukazu Wakabayashi

  Last, Mar. 2020, Journal of Japan Institute of Navigation, (141) (141), 1 - 8, Japanese

  [Refereed]

  Scientific journal


• Study of the Osaka Bay Anchorage Situation during three Typhoons in 2018 with emphasis on Typhoon No. 21 (Jebi)

  Nobukazu Wakabayashi, Toshifumi Hayashi, Yoshiji Yano

  Lead, Feb. 2020, Journal of Japan Institute of Navigation, 141, 24 - 32, Japanese

  [Refereed]

  Scientific journal


• Motor Vessel LAN - Design, Implementation, and Operation

  WAKABAYASHI NOBUKAZU, WATANABE TAKAYUKI, URAKAMI MISAKO, YANO YOSHIJI

  Resulting from the spread of computer usage, substantial advances in the development of network technologies, and the increasingly common ability to connect to the Internet, today’s world is undergoing a significant evolvement in the methods of communication.
  Aboard motor vessels, the widespread dependence on computer technology by various forms of equipment has created a need

  Lead, IEEE Austria section / TU Graz, Jul. 2018, 2018 International Conference on Broadband Communications for Next Generation Networks and Multimedia Applications, 1 - 8, English

  [Refereed]

  International conference proceedings


• A Study on Location Information Screening Method for Ship Application Using AIS Recorded Data

  URAKAMI MISAKO, WAKABAYASHI NOBUKAZU, WATANABE TAKAYUKI

  We focus on the relationship between real-time data in the automatic information system (AIS) station on each ship and between each ship.
  However, these types of stored recorded data can become big amounts of data. If these data are stored using traditional methods, the data analysis would take too much time.
  In this study, we focus on the recorded and stored AIS data in the ow

  IEEE Austria section / TU Graz, Jul. 2018, 2018 International Conference on Broadband Communications for Next Generation Networks and Multimedia Applications, 1 - 6, English

  [Refereed]

  International conference proceedings


• Tablet Control System for Offshore Support and Research Vessel — Development, Implementation, and Operational Testing—

  WAKABAYASHI NOBUKAZU, WATANABE TAKAYUKI, URAKAMI MISAKO, YANO YOSHIJI

  While conducting oceanic support, observations, and/or research, there are instances when offshore support, observation, and research vessels find it desirable to be able to control maneuvering from shipboard locations other than from the Bridge. The use of transceivers or interphones to convey orders or information is, unfortunately, simply one-way communication so that it is

  Lead, The International Society of Offshore and Polar Engineers (ISOPE), Jun. 2018, Proceedings of the Twenty-eighth (2018) International Ocean and Polar Engineering Conference, 922 - 928, English

  [Refereed]

  International conference proceedings


• Evaluation of Heading Control System for Offshore Service or Observation

  WATANABE TAKAYUKI, WAKABAYASHI NOBUKAZU, URAKAMI MISAKO

  Recently, improvement of fuel efficiency is a big theme in the shipbuilding industry. And also, the HCS, a system with good fuel economy performance is required. It is not easy to evaluate the fuel economy performance of the HCS. The reason is that the influence of disturbance such as wind and waves is greater than influence of fuel efficiency performance by steering of the HCS

  Corresponding, The International Society of Offshore and Polar Engineers (ISOPE), Jun. 2018, Proceedings of the Twenty-eighth (2018) International Ocean and Polar Engineering Conference, 745 - 751, English

  [Refereed]

  International conference proceedings


• Development of Track Control System utilizing Heading Control System for Ocean Observation Sailing

  WATANABE TAKAYUKI, WAKABAYASHI NOBUKAZU, URAKAMI MISAKO, TERADA DAISUKE

  An accurate Heading Control System (HCS) is required for vessels engaged in offshore support operations or ocean observation. The function of the Track Control System (TCS) is also useful to carry out the automatic navigation along the survey line exactly for observation. We propose a new concept of the HCS that can be utilized to realize the TCS feature. We focus to two topics

  Corresponding, the International Society of Offshore and Polar Engineers (ISOPE), Jun. 2017, Proceedings of the Twenty-seventh (2017) International Ocean and Polar Engineering Conference, 529 - 536, English

  [Refereed]

  International conference proceedings


• Development of Simple Dynamic Positioning System — Algorithm and User Interface —

  WAKABAYASHI NOBUKAZU, WATANABE TAKAYUKI, URAKAMI MISAKO, TERADA DAISUKE

  We propose new concept of simple DP system. Minimum data input from sensors are used for control the ship position and heading. Only GPS position (latitude and Longitude) and Gyro compass heading data are necessary. The prediction of the position and heading realized by means of simple extrapolation using recorded data are used for calculation. Therefore, no complex ship motion

  Lead, the International Society of Offshore and Polar Engineers (ISOPE), Jun. 2017, Proceedings of the Twenty-seventh (2017) International Ocean and Polar Engineering Conference, 507 - 512, English

  [Refereed]

  International conference proceedings


• Development of A Utility Tool for Small Craft Processing Recorded Class B AIS Data

  URAKAMI MISAKO, MOTOGI HISAYA, SUNADA TOMOHISA, WATANABE TAKAYUKI, WAKABAYASHI NOBUKAZU

  We focus our attention these AIS data transmitted and received on the
  AIS (Automatic Identification System) station on each ship as a Probe
  Data in marine traffic. We consider a ship a probe in marine traffic
  management. By some researcher, a system for not only supporting
  ship handling, such as collision avoidance, but also another aspect of
  the Class A AIS data usage, is prop

  Last, the International Society of Offshore and Polar Engineers (ISOPE), Jun. 2017, Proceedings of the Twenty-seventh (2017) International Ocean and Polar Engineering Conference, 610 - 614, English

  [Refereed]

  International conference proceedings


• Ocean-Bottom Exploration Activities by Training Ship Fukae-maru

  矢野 吉治, 若林. 伸和

  神戸大学大学院海事科学研究科, 2017, 神戸大学大学院海事科学研究科紀要 = Review of Graduate School of Maritime Sciences, Kobe University, 14, 1 - 14, Japanese

  Link to Kobe Univ. Repository (Kernel)


• Class B AISの普及を目指したAIS記録データ処理ツールの開発－小型船舶の運航管理への適用－

  URAKAMI MISAKO, IWAMI SHOHEI, SUNADA TOMOHIRO, WAKABAYASHI NOBUKAZU

  Last, Japan Institute of Navigation, Dec. 2016, 日本航海学会論文集, (135) (135), 122 - 128, Japanese

  [Refereed]

  Scientific journal


• BASIC STUDY ON WAVES FAR FROM COASTAL AREA AND APPLICATION FOR SHIP OPERATION

  SASA KENJI, CHEN CHEN, SHIOTANI SHIGEAKI, WAKABAYASHI NOBUKAZU, TERADA DAISUKE

  Japan Society of Civil Engineering, Nov. 2015, Annual Journal of Civil Engineering in the Ocean, JSCE, 71, Japanese

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Risk Evaluation Model for Management of Navigation Safety in an Entire Ship Route Area

  S. Hwang, E. Kobayashi, N. Wakabayashi, N. Im

  This paper introduces a new model for risk evaluation of navigation safety in an entire ship
  route area. The model takes into consideration the perceptions of navigational officers by means of a risk
  evaluation algorithm developed using a questionnaire. The results obtained with the questionnaire reveal the
  types of factors that may affect navigation officers’ perceptions. The

  CRC Press, Jun. 2015, Safety of Navigation, Activities in Navigation – Marine Navigation and Safety of Sea Transportation, English

  [Refereed]

  International conference proceedings


• Evaluation of Ship Performance in International Maritime Transportation using an Onboard Observation System—In Case of a Bulk Carrier for International Voyages—

  SASA KENJI, TERADA DAISUKE, SHIOTANI SHIGEAKI, WAKABAYASHI NOBUKAZU, IKEBUCHI TAKURO, CHEN CHEN, TAKAYAMA ATSUYOSHI, UCHIDA MAKOTO

  Elsevier, Jun. 2015, J. Ocean Engineering, 104, 294 - 309, English

  [Refereed]

  Scientific journal


• Probability of Ship on Collision Courses Based on the New PAW Using MMG Model and AIS Datar

  I.P.S. Asmara, KOBAYASHI EI-ICHI, N. Wakabayashi, K.B. Artana

  This paper proposes an estimation method for ships on collision courses taking crash astern
  maneuvers based on a new potential area of water (PAW) for maneuvering. A crash astern maneuver is an
  emergency option a ship can take when exposed to the risk of a collision with other ships that have lost control.
  However, lateral forces and yaw moments exerted by the reversing propell

  Gdynia Maritime University, Mar. 2015, the International Journal on Marine Navigation and Safety of Sea Transportation, 9(1) (1), 43 - 50, English

  [Refereed]

  Scientific journal


• Formal Safety Assessment (FSA) for Analysis of Ship Collision Using AIS Data

  M.B. Zaman, A. Santoso, Ei-ichi Kobayashi, Nobukazu Wakabayashi, A. Maimun

  Currently, Maritime safety is the best issue in the world. International Maritime organization
  (IMO) have recommended FSA methodology to enhance maritime safety. In this paper, the research conducted
  in the Malacca Strait. Malacca Strait is an area that has a high risk for shipping navigation. Many accidents
  occur in the area are like collision, fire, grounding and so on. There

  Gdynia Maritime University, Mar. 2015, The international Journal on Marine Navigation and Safety of Sea Transportation, 9(1) (1), 67 - 72, English

  [Refereed]

  Scientific journal


• BASIC STUDY ON WAVES FAR FROM COASTAL AREA AND APPLICATION FOR SHIP OPERATION

  SASA Kenji, CHEN Chen, SHIOTANI Shigeaki, WAKABAYASHI Nobukazu, TERADA Daisuke

   There is little information of waves far from coastal zones currently, the possibility of wave information is studied here by using a wave radar analyzer and numerical simulation models, WRF and SWAN. It is assured that measured wave data is practically enough accurate to apply for ship operation. On the other hand, computed results in numerical models underestimate wave heights a little. It is necessary to accumulate wave data in many ships from now on, and it will help to correct wave height accurately. The wave information service far from coastal areas is expected to construct.

  Japan Society of Civil Engineers, 2015, Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering), 71(2) (2), I_185 - I_190, Japanese

  [Refereed]

  International conference proceedings

  Link to Kobe Univ. Repository (Kernel)


• Estimation Method for Dragged Anchor Accident Frequency on Subsea Pipelines in Busy Port Areas

  KOBAYASHI EI-ICHI, Yeyes Mulyadi, Nobukazu Wakabayashi, Trika Pitana, Wahyudi, Eko Prasetyo

  Recently, many subsea pipelines have been developed in busy port areas, including industrial ports, recreational areas, fishing areas, and other port facilities. Under busy ship traffic conditions, these subsea pipelines are likely to be exposed to the risk of damage by a dragged anchor or other dropped objects. In this paper, a model is proposed to estimate the dragged anchor

  The Japan Society of Naval Architects and Ocean Engineers, Dec. 2014, Journal of the Japan Society of Naval Architects and Ocean Engineers, 20(Vol. 20) (Vol. 20), 173 - 183, English

  [Refereed]

  Scientific journal


• Outline of an ADCP newly mounted on Fukae-maru and results of trial on the sea

  YANO YOSHIJI, HAYASI MITSURU, WAKABAYASI NOBUKZU, SUGII MASAE

  2014年1月末からの練習船深江丸の定期検査入渠工事で新規に搭載したADCPについてその概要を述べるとともに、搭載後、初の海上トライアルの内容とその結果について論述した。

  Graduate School of Maritime Sciences, Kobe University, Oct. 2014, Review of Graduate School of Maritime Sciences, Kobe University, (11) (11), 29 - 38, Japanese

  Research institution

  Link to Kobe Univ. Repository (Kernel)


• Sea Surface Temperature and Tidal Front of Akashi Strait Measured by Fukae Maru

  Mitsuru HAYASHI, Koki TOKUDOME, Takuma KOIE, Michio FUJII, WAKABAYASHI NOBUKAZU, KOZAI KATSUTOSHI

  日本航海学会, Jan. 2014, Navigation, 187(187) (187), 55 - 62, Japanese

  Scientific journal


• Fuzzy FMEA model for risk evaluation of ship collisions in the Malacca Strait: Based on AIS data

  M. B. Zaman, E. Kobayashi, N. Wakabayashi, S. Khanfir, T. Pitana, A. Maimun

  2014, Journal of Simulation, 8(1) (1), 91 - 104, English

  [Refereed]

  Scientific journal


• The study of Simple Navigation System for small craft using Class B AIS

  Michio Fujii, Misako Urakami, Kazuo Yamashita, Nobukazu Wakabayashi

  Last, 2014, OCEANS 2014 - TAIPEI, English

  [Refereed]

  International conference proceedings


• Development of ship sinking frequency model over Subsea Pipeline for Madura Strait using AIS data

  Yeyes Mulyadi, Eiichi Kobayashi, Nobukazu Wakabayashi, Trika Pitana, Wahyudi

  Springer Verlag, 2014, WMU Journal of Maritime Affairs, 13(1) (1), 43 - 59, English

  [Refereed]

  Scientific journal


• THE DEVELOPMENT OF METEOROLOGICAL AND OCEANOGRAPHIC DATA COLLECTION AND RECORDING SYSTEM OPERATING ON TRAINING SHIP

  Michio Fujii, Mitsuru Hayashi, Misako Urakami, Nobukazu Wakabayashi

  Last, 2014, 33RD INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE AND ARCTIC ENGINEERING, 2014, VOL 8B, (23883) (23883), English

  [Refereed]

  International conference proceedings


• SIMULATION-BASED ESTIMATION OF COLLISION RISK DURING SHIP MANEUVERING IN TWO-LANE CANAL USING MATHEMATICAL MANEUVERING GROUP MODEL AND AUTOMATIC IDENTIFICATION SYSTEM DATA

  I. Putu Sindhu Asmara, Eiichi Kobayashi, Ketut Buda Artana, Agoes A. Masroeri, Nobukazu Wakabayashi

  2014, 33RD INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE AND ARCTIC ENGINEERING, 2014, VOL 4A, English

  [Refereed]

  International conference proceedings


• Ship Motions of Cargo Ship in Stormy Condition at Actual Sea -Analysis and Estimation of Ship Motions and Wave Properties due to Onboard Data-

  SASA KENJI, TERADA DAISUKE, SHIOTANI SHIGEAKI, WAKABAYASHI NOBUKAZU, IKEBUCHI TAKURO

  Japan Society of Naval Architects and Ocean Engineers, Dec. 2013, Journal of the Japan Society of Naval Architects and Ocean Engineers, (18) (18), 167 - 175, Japanese

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Proposal of utilization of the accumulated AIS own ship data to optimal supporting for navigation system

  URAKAMI MISAKO, WAKABAYASHI NOBUKAZU, MOTOGI HISAYA

  We view AIS (Automatic Identification System) as a probe information system. Then, it can be said that a vessel is the probe of marine traffic. Nowadays, AIS information is mainly received and collected by each AIS land station near the coast in Japan. After that, it’s provided to a vessel and maritime society by creating added value in collected information. However, the infor

  Japan Institute of Navigation, Dec. 2013, 日本航海学会論文集, 129, 51 - 57, Japanese

  [Refereed]

  Scientific journal


• データ分析から見た船舶運航における波浪予報の現状と課題について

  SASA Kenji, SHIOTANI Shigeaki, TERADA Daisuke, WAKABAYASHI Nobukazu, OSAWA Teruo

  Numerical forecasts of weather and oceanography are in common in the field of ship operation, as the improvement of computer science these days. However, their accuracies is still unreliable in some situations. Here, nationwide questionnaire is implemented to make sure the current effectiveness of wave forecast from viewpoint of navigation safety. A couple of weather patterns are revealed as the difficulty of forecast. Moreover, two cases of failed forecast are analyzed with observed and forecasted database. These patterns are caused under the low pressure develops and moves north-easterly. Authors concludes that the backdrop has to be revealed why these weather patterns tend to misforcast in the future.

  Japan Society of Civil Engineers, Nov. 2013, 土木学会論文集B3（海洋開発）, 69(2) (2), I_61 - I_66, Japanese

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Mitigation of Maritime Navigational Aids for Subsea Pipeline in Busy Port Area using AIS data

  KOBAYASHI EI-ICHI, Yeyes Mulyadi, Nobukazu Wakabayashi, Trika Pitana, Wahyudi

  Nov. 2013, 5th International Maritime Conference on Design for Safety, English

  [Refereed]

  International conference proceedings


• Port Traffic Safety Analysis in Madura Strait by Using Mathematical Maneuvering Group (MMG) Model and Automatic Identification System (AIS) Data

  KOBAYASHI EI-ICHI, I Putu Sindhu Asmara, Nobukazu Wakabayashi, Ketut Buda Artana, A.A.B. Dinariyana, Trika Pitana

  Jun. 2013, 5th International Maritime Conference on Design for Safety, English

  [Refereed]

  International conference proceedings


• Trial maneuvers based collision avoidance between anchorage areas using mathematical maneuvering group (MMG) model and automatic identification system (AIS) data

  I Putu Sindhu Asmara, KOBAYASHI EI-ICHI, WAKABAYASHI NOBUKAZU, Ketut Buda Artana, 村山 雅子, Trika Pitana

  日本船舶海洋工学会, May 2013, 日本船舶海洋工学会講演会論文集, (第16号) (第16号), 47 - 50, Japanese

  Symposium


• Comparison of the Weather Global Forecast System for International Maritime Transport with ECMWF-IFS/Ship Weather Data

  TANEMOTO Jun, OHSAWA Teruo, SHIMADA Yoichi, TAKAHASHI Keiko, WAKABAYASHI Nobukazu, SHIOTANI Shigeaki

  Japan Institute of Navigation, 2013, NAVIGATION, 186, 45 - 50, Japanese


• EXAMINATION ON ROUTS KEEPING OF A SHIP SAILING IN INPORT AND OUTPORT BY ANALYSIS OF AIS INFORMATION

  SHIOTANI Shigeaki, TAKIBAYASHI Yuuya, GAO Xinjia, WAKABAYASHI Nobukazu

  The many maritime laws are provided for safe navigation in marine traffic. As the coastal area such as Tokyo Bay, Ise Bay, Osaka Bay and Setonaikai is very confused by many sailing ships and have shallow water area, the risk of the generation of a marine disaster is very high. Especially, the most dangerous become high in the case of inport and outport of a special port. The regulation rools for a siling ship passing a special port are provided for safe navigation.
   The object of present paper is the examination on routs keeping of a ship sailing proposes under maritime low in inport and outport.We could obtain many information for the object that guidance for keep of maritime regulation or arrangement of maritime law will be proposed in future.

  Japan Society of Civil Engineers, 2013, PROCEEDINGS OF CIVIL ENGINEERING IN THE OCEAN, 69(2) (2), I_622 - I_627, Japanese


• Analysis of Piracy Acts using Geospatial Information System

  渡川 真規, 古莊 雅生, 若林 伸和, 小林 英一

  According to IMB annual report 2011, Piracy activity of recent years is increasing around the world. This study investigates spatial pattern of piracy activity using GIS based-hazard map. Hazard map is a useful tool for spatial planning and providing an image of the most vulnerable areas. The authors have focused attention on distribution of piracy incidents in South East Asia, the hazard map by analyzing directional distribution and kernel density estimation from each piracy location is created for maritime security. Nowadays, the number of AIS (Automatic Identification System)-equipped ships is increasing under the international convention for the Safety of Life at Sea (SOLAS). The AIS is automatically providing navigation information to other ships and coastal authorities to improve the maritime safety. We hope that an analyzing AIS data is also an effective solution for investigating ship accident against illegal activity. In this paper, an approach for kinetic analysis of actual attacks using AIS data with Satellite image is presented.

  Japan Institute of Navigation, 2013, The Journal of Japan Institute of Navigation, 128, 55 - 63, Japanese


• Measurement of Sea-Shocks Response of a Sailing Ship in Japan

  SHIOTANI Shigeaki, SASA Kenji, WAKABAYASHI Nobukazu, TERADA Daisuke

  2013, Proceedings of the 23rd International Conference of Offshore and Polar Engineering, English

  [Refereed]

  International conference proceedings


• CURRENT SITUATION AND DIFFICULTY OF WAVE FORECAST FROM VIEWPOINT OF SHIP MANAGEMENT

  Kenji Sasa, Daisuke Terada, Shigeaki Shiotani, Nobukazu Wakabayashi, Teruo Ohsawa

  2013, PROCEEDINGS OF THE ASME 32ND INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE AND ARCTIC ENGINEERING - 2013 - VOL 5, 1 - 8, English

  [Refereed]

  International conference proceedings


• On Time Series Analysis Concerning the Ship Acceleration Caused by Seaquake

  TERADA Daisuke, WAKABAYASHI Nobukazu, SASA Kenji, MATSUDA Akihiko

  Nov. 2012, Proceedings of Asia Navigational Conference 2012, 177 - 185, English

  [Refereed]

  International conference proceedings


• 荒天航海時の船体運動と海上輸送の安全・効率性の関係について

  SASA Kenji, TERADA Daisuke, SHIOTANI Shigeaki, WAKABAYASHI Nobukazu

  The balancing between safety and efficiency becomes imminent more than ever. It is caused by the global economic downturn, the steep rise of fuel oil price, etc. Shipping companies already installed the weather routing service for their controlled ships. However, it is necessary to consider the influence of ship motions more theoretically. Here, onboard measurements have been implemented for an ocean going bulk carrier to know relations between ship motions and other related parameters. Relational analysis is implemented against observed data to construct the total evaluation system of maritime transportation as "three principles of transportation."

  Japan Institute of Navigation, Sep. 2012, 日本航海学会論文集, 127(127) (127), 79 - 87, Japanese

  [Refereed]

  Scientific journal


• Kinetic Analysis of Ships using Satellite Image

  Masanori Watagawa, Ei-ichi Kobayashi, Nobukazu Wakabayashi

  Sep. 2012, Journal of the Japan Society of Naval Architects and Ocean Engineers, 15号, Japanese

  [Refereed]

  Scientific journal


• Implementation of Automatic Identification System (AIS) for Evaluation of Marine Traffic Safety in Strait of Malacca using Analytic Hierarchy Process (AHP)

  Muhammad Badrus Zaman, Ei-ichi Kobayashi, Nobukazu Wakabayashi, Trika Pitana, Adi Maimun

  Sep. 2012, Journal of the Japan Society of Naval Architects and Ocean Engineers, 15号, Japanese

  [Refereed]

  Scientific journal


• Basic Study on Operational Evaluation of International Voyage from Viewpoint of Ship Motions and Oceanographic Database

  SASA Kenji, TERADA Daisuke, SHIOTANI Shigeaki, WAKABAYASHI Nobukazu, KOBAYASHI Eiichi, MAKINO Hidenari, SHIMADA Youichi, UCHIDA Makoto, TANEMOTO Jun

  日本船舶海洋工学会, May 2012, Proceedings of the Conference of the Japan Society of Naval Architects and Ocean Engineers, No.14, pp.107-110(14) (14), 107 - 110, Japanese

  International conference proceedings


• A Study of Availability and Popularisation of Class B AIS

  YAMASHITA Kazuo, WAKABAYASHI Nobukazu, WATANABE Takayuki

  AIS has not spread through almost all small vessels now. Since a small vessel hides in the shadow of a breakwater or a wave easily and it is hard to catch it by a radar, the spread of AIS is desired. In this paper, the analysis and the questionnaire of data perform consideration about the practicality of Class B AIS and spread which are AIS for vessels without duty. Our investigation showed that the degree and notability of the spread of AIS in a small vessel were very low. In a small vessel, they are common knowledge and low-pricing about AIS spread. It is important to advertize the validity of AIS in each organization concerned. Moreover, it is necessary to advance popularisation by holding down a price.

  Japan Institute of Navigation, 2012, The Journal of Japan Institute of Navigation, 127, 133 - 140, Japanese


• Data Analysis of Safety Evaluation of Outbound Cargo Carrier from Viewpoint of Ship Motions

  SASA Kenji, TERADA Daisuke, SHIOTANI Shigeaki, KOBAYASHI Eiichi, WAKABAYASHI Nobukazu, MAKINO Hidenari, SHIMADA Yoichi, UCHIDA Makoto

  Japan Institute of Navigation, 2012, NAVIGATION, 180, 42 - 47, Japanese


• Monitoring of Vessel Traffic using AIS Data and ALOS Satellite Image

  Masanori Watagawa, Eiichi Kobayashi, Nobukazu Wakabayashi

  2012, OCEANS, 2012 - YEOSU, English

  [Refereed]

  International conference proceedings


• A Study on Operational Performance of Cargo Carrier from Viewpoint of Safety

  SASA Kenji, TERADA Daisuke, SHIOTANI Shigeaki, KOBAYASHI Eiichi, WAKABAYASHI Nobukazu, MAKINO Hidenari, SHIMADA Youichi, UCHIDA Makoto

  The Japan Society of Naval Architects and Ocean Engineers, Nov. 2011, Proceedings of the Conference of the Japan Society of Naval Architects and Ocean Engineers, 13, 303 - 306, Japanese

  International conference proceedings


• Fault-Tree Analysis Model of Tanker Accidents for Formal Safety Assessment(FSA) in the Malacca Straits Based on AIS Data

  Muhammad Badrus Zaman, Eiichi Kobayashi, Nobukazu Wakabayashi, Adi Maimun, Trika Pitana

  Oct. 2011, Proceedings of the International Symposium on Marine Engineering(ISME), English

  [Refereed]

  Scientific journal


• Estimation of Pipeline Accident Probability Caused by Ship Sinking Using AIS

  Yeyes Mulyadi, Eiichi Kobayashi, Nobukazu Wakabayashi, Muhammad Badruz Zaman, Trika Pitana, Trika Wahyudi

  Oct. 2011, Proceeding of the InternationalSymposium on Marine Engineering(ISME), English

  [Refereed]

  Scientific journal


• 津波警報発令時における湾内の船舶の避航・避泊行動に関する調査研究

  Hidenari Makino, Nobukazu Wakabayashi, Shigeaki Shiotani

  External forces of marine weather, such as waves, currents and wind flows, affect the course and speed of a ship under way. As a result, marine accidents, such as collisions or grounding, may occur, particularly in inshore areas. On coasts where earthquakes and tsunamis occur frequently, such as the Japanese coast, a tsunami that advances into a bay from the open sea is influenced by the submarine topography. It grows into a huge wave that could cause tremendous damage to ships under way and at anchorage. A massive earthquake occurred in the Tohoku and Kanto regions of Japan on 11 March 2011. In response, a tsunami alert, a tsunami warning and an advisory were issued for the entire Pacific coast region. This research investigates the evacuation behaviour of ships by AIS data in Tokyo bay and Osaka bay after the tsunami warning was issued. The unusual behaviour observed was attributed to the emergency evacuation of ships. In addition, the propagation direction of the tsunami was clarified by analysing the drift situation of each ship.

  Japan Institute of Navigation, Sep. 2011, 日本航海学会論文集第125号, pp.191-198, 191 - 197, Japanese

  [Refereed]

  Scientific journal


• Research on trend of ship evaluation behavior when Tsunami warning

  YANO Yoshiji, MAKINO HIDENARI, WAKABAYASHI NOBUKAZU, SHIOTANI SHIGEAKI

  External forces of marine weather, such as waves, currents and wind flows, affect the course and speed of a ship under way. As a result, marine accidents, such as collisions or grounding, may occur, particularly in inshore areas. On coasts where earthquakes and tsunamis occur frequently, such as the Japanese coast, a tsunami that advances into a bay from the open sea is influenced by the submarine topography. It grows into a huge wave that could cause tremendous damage to ships under way and at anchorage. A massive earthquake occurred in the Tohoku and Kanto regions of Japan on 11 March 2011. In response, a tsunami alert, a tsunami warning and an advisory were issued for the entire Pacific coast region. This research investigates the evacuation behaviour of ships by AIS data in Tokyo bay and Osaka bay after the tsunami warning was issued. The unusual behaviour observed was attributed to the emergency evacuation of ships. In addition, the propagation direction of the tsunami was clarified by analysing the drift situation of each ship.

  Japan Institute of Navigation, Sep. 2011, The Journal of Japan Institute of Navigation, 第125号・pp.191-197, 191 - 197, Japanese

  [Refereed]

  Scientific journal


• 荒天時の船体運動と貨物損傷の関係について

  Kenji Sasa, Daisuke Terada, Nobukazu Wakabayashi, 塩谷 茂明

  Sep. 2011, 日本航海学会論文集, 第125号,pp.199-207, Japanese

  [Refereed]

  Scientific journal


• Ship Collision Probability For Formal Safety Assessment (FSA) Based on AIS Data in the MALACCA Straits

  Muhammad Badrus ZAMAN, Eiichi KOBAYASHI, Nobukazu WAKABAYASHI, Adi MAIMUN

  Sep. 2011, Proceedings of Asia Navigation Conference 2011, English

  [Refereed]

  Scientific journal


• 沖合波浪およびAISデータを用いたフェリー海難の事故分析に関する研究

  Kenji Sasa, Nobukazu Wakabayashi, Eiichi Kobayashi, Daisuke Terada, Shigeaki Shiotani

  Jul. 2011, 土木学会論文集 B3(海洋開発)特集号, Vol.67 No.2,pp.I_832-I_837, Japanese

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• 沖合波浪およびAISデータを用いたフェリー海難の事故分析に関する研究

  SASA Kenji, WAKABAYASHI Nobukazu, KOBAYASHI Eiichi, TERADA Daisuke, SHIOTANI Shigeaki

  Jun. 2011, 土木学会論文集B3（海洋開発）, 67(4) (4), 1 - 6, Japanese

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• A CONTEXT MODEL WITH A TIME-DEPENDENT MULTI-LAYER EXCEPTION HANDLING POLICY

  Chia-Hung Shih, Nobukazu Wakabayashi, Saburo Yamamura, Chen-Yuan Chen

  May 2011, INTERNATIONAL JOURNAL OF INNOVATIVE COMPUTING INFORMATION AND CONTROL, 7(5A) (5A), 2225 - 2234, English

  [Refereed]

  Scientific journal


• Development of Radar ARPA Simulator Software using AIS Data for Ship Data

  Nobukazu WAKABAYASHI, Hidenari MAKINO, Miwako ITO, Shigeaki SHIOTANI

  For the safety navigation of the ship, it is necessary for navigator to understand a surrounding situation that changes promptly and they must judge proper ship handling with various information. Recently, it is general to use a radar ARPA (Automatic Radar Plotting Aids) for this purpose. To practice usage of radar system effectively, radar simulator have been developed and utilized for training. In general, process to generate training scenario is not so simple and is time-consuming task. We propose the radar simulator as a PC software which uses the recorded AIS data for surrounding ship's data, and the scenario can be made automatically from actual data. So the user can do training anytime anywhere. To improve the efficiency of training, we introduce some technique to generate more realistic display image of ships and land area. In this paper, system configuration, and conclusion of its execution will be given.

  Lead, Japan Institute of Navigation, Mar. 2011, Journal of Japan Institute of Navigation, 第124号・87-93, 87 - 93, Japanese

  [Refereed]

  Scientific journal


• Design of AIS Based Navigation System

  Nobukazu WAKABAYASHI, Shinji MIZUI, Shigeaki SHIOTANI, Hidenari MAKINO

  AIS (Universal shipborne Automatic Identification System) has been introduced, and AIS instruments are now widely installed onboard certain ships which are obliged by SOLAS. AIS target data should be provided to deck officers with relevant instruments that can be display them on chart, and they can use the data effectively for decision making of ship navigation. However, the navigation instruments like radar or ECDIS (Electronic Chart Display and Information System) which has such function of overlay display of target data on chart are so expensive and can be used in limited large scale vessels. So, we propose more inexpensive system which has similar functions about AIS target display. Moreover, AIS can output not only other ship's target data but also own ship's sailing data periodically with digital format i.e. NMEA format, and they are enough to achieve electronic navigation. In this paper, we show a simple design of navigation system using AIS data, and also show a prototype system on actual merchant vessel.

  Lead, Japan Institute of Navigation, Mar. 2011, Journal of Japan Institute of Navigation, 第124号・79-86, 79 - 86, Japanese

  [Refereed]

  Scientific journal


• Study on Presentation of Navigational Information for Support of Safety of a Ship by GIS

  S. Shiotani, S. Ryu, H. Makino, N. Wakabayashi, Y. Shimada

  2011, 2011 IEEE - OCEANS SPAIN, pp.1-6, English

  [Refereed]

  International conference proceedings


• 大規模AISデータを用いた統計分析

  KOBA Takeshi, WAKABAYASHI Nobukazu

  Last, Japan Institute of Navigation, Dec. 2010, 日本航海学会学会誌NAVIGATION, 第175号92-96頁, 92 - 96, Japanese

  [Refereed]

  Scientific journal


• Usage of Automatic Identification System(AIS) for Evaluation of

  Muhammad Badruz Zaman, Eiichi Kobayashi, Nobukazu Wakabayashi, Trika Pitana, Adi Maimun

  Dec. 2010, Proceedings of 4th PAAMS and AME2010, pp.462-467, English

  [Refereed]

  Scientific journal


• Installation of an AIS data reciving system network

  Eiichi Kobayashi, Nobukazu Wakabayashi, Hidenari Makino, Trika Pitana, Soo Jin Hwang

  Nov. 2010, Proceedings of Asia Navigation Conference 2010, pp.140-147, English

  [Refereed]

  Scientific journal


• Development of Radar ARPA Simulator Software Reproducing an Actual Sea Area Situation

  Nobukazu WAKABAYASHI, Hidenari MAKINO, Shigeaki SHIOTANI

  Nov. 2010, THE FIRST GLOBAL CONFERENCE ON INNOVATION IN MARINE TECHNOLOGY AND THE FUTURE OF MARITIME TRANSPORTATION, 401-409, English

  [Refereed]

  International conference proceedings


• A Statistical Analysis of the Waiting Activity in Offshore Waters -A Case of Hanshin Port-

  Takeshi KOBA, Sung-Il Han, Nobukazu WAKABAASHI

  Last, Sep. 2010, Journal of the Japan Society of Naval Architects and Ocean Engineering, 第11巻・165-171, Japanese

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Overview of the Implementation on Automatic Identification System Data

  Soo Jin Hwang, Eiichi Kobayashi, Nobukazu Wakabayashi, Trika Pitana, Hidenari Makino

  Jul. 2010, The Proceedings of The 5th Asia-Pacific Workshop on Marine Hydrodynamics-APHydro2010, English

  [Refereed]

  Scientific journal


• AISデータを用いた船舶沖まち行動の分析:阪神港入港船舶を対象として

  KOBA Takeshi, HAN Sung-Il, WAKABAYASHI Nobukazu

  Last, 日本船舶海洋工学会, Jun. 2010, 日本船舶海洋工学会論文集, 第11巻165-171頁, 165 - 171, Japanese

  [Refereed]

  Scientific journal


• Estimation of Exhaust of Marine Traffic by Using Automatic Identification System Data(Case Study:the Madura Strait Area, Indonasia)

  Trika Pitana, Eiichi Kobayashi, Nobukazu Wakabayashi

  Last, May 2010, OCEANS2010, English

  [Refereed]

  Scientific journal


• Development of radar simulator software using AIS data for ship data

  Nobukazu Wakabayashi, Hidenari Makino, Kenji Mori, Shigeaki Shiotani

  Lead, May 2010, OCEANS'10 IEEE Sydney, OCEANSSYD 2010, 100129-025, English

  [Refereed]

  International conference proceedings


• Basic Study On Construction Of VisuaL Evaluation System For Safety Ship Navigation

  Hidenari MAKINO, Eiichi KOBAYASHI, Nobukazu WAKABAYASHI, Shigeaki SHIOTANI

  May 2010, Proc. OCEANS'10 IEEE (May. 2010, Sydney, Australia), 100129-024, English

  [Refereed]

  International conference proceedings


• Basic Constraction of Visual Evaluation System for Safety Ship Navigation

  Hidenari Makino, Eiichi Kobayashi, Nobukazu Wakabayashi, Shigeaki Shiotani

  May 2010, OCEANS2010, English

  [Refereed]

  Scientific journal


• Research on Construction of Visual Evaluation System for Safety Ship Navigation using Three-dimensional Animation

  MAKINO Hidenari, KOBAYASHI Eiichi, SHIOTANI Shigeaki, WAKABAYASHI Nobukazu

  Japan Institute of Navigation, 2010, NAVIGATION, 175, 57 - 61, Japanese


• Estimation of exhaust emissions of marine traffic using Automatic Identification System data (Case Study: Madura Strait area, Indonesia)

  Trika Pitana, Eiichi Kobayashi, Nobukazu Wakabayashi

  2010, OCEANS'10 IEEE Sydney, OCEANSSYD 2010, 100125-006, English

  [Refereed]

  International conference proceedings


• The Evaluation Test of Antifouling Bottom Paint of a Ship by Training Ship Fukae-maru

  矢野 吉治, 滝本 剛士, 若林 伸和

  神戸大学大学院海事科学研究科, Jul. 2009, 神戸大学大学院海事科学研究科紀要 = Review of the Faculty of Maritime Sciences, Kobe University, 6, 33 - 41, Japanese


• ナビゲーションシステムにおけるターゲット情報の提示方法に関する提案

  Nobukazu WAKABAYASHI, Juri HARADA, Eiichi KOBAYASHI, Ruri SHOJI

  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.

  Lead, Japan Institute of Navigation, Sep. 2008, THE JOURNAL OF JAPAN INSTITUTE OF NAVIGATION, 第119号, 75 - 82, Japanese

  [Refereed]

  Scientific journal


• An Efficient Data Structure for Querying XML Document in Maritime Field

  Chia-Hung SHIH, Nobukazu WAKABAYASHI, Saburo YAMAMURA, Juri HARADA

  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.

  Japan Institute of Navigation, Sep. 2008, THE JOURNAL OF JAPAN INSTITUTE OF NAVIGATION, 第119号, 83 - 89, English

  [Refereed]

  Scientific journal


• A Swing Control of a Ship at Anchoring under Stormy Weather

  矢野 吉治, 有田 俊晃, 若林 伸和

  神戸大学大学院海事科学研究科, Jul. 2008, 神戸大学大学院海事科学研究科紀要 = Review of the Faculty of Maritime Sciences, Kobe University, 5, 73 - 83, Japanese


• 津波襲来時のLNG船の避航ガイドラインの検討

  WAKABAYASHI NOBUKAZU

  Mar. 2008, 第20回海洋工学シンポジウム，日本海洋工学会・日本船舶海洋工学会, Japanese

  Symposium


• 実船における船底汚損の推定

  Yoshiji YANO, Nobukazu WAKABAYASHI

  The situation of the bottom fouling of a ship is not the same in an individual ship according to lapsed days after dry docking, the condition of ship services and mooring environment etc. And the quantification of the degree of bottom fouling are assumed to be difficult. The degree of the bottom fouling are often judged from an indirect viewpoint such as decrease of ship speed, increase of main engine output and fuel consumption. To presume an increase of the friction drag because of the bottom fouling, the short stopping experiments are designed and have been executed by Training Ship Fukae-maru, the graduate school of maritime sciences, Kobe University. It is possible to experiment in a short time of about 30 minutes and wide sea room is not needed to execution in case of Fukae-maru. The authors propose this experimental maneuver. Then the methods of analysis and the result of analysis at present stage are described.

  Last, Japan Institute of Navigation, Mar. 2008, 日本航海学会論文集, 第118号, pp.135-143, 135 - 143, Japanese

  [Refereed]

  Scientific journal


• A Distributed Data Model for Port Administration and Onboard Information & Service Management

  Chia-Hung SHIH, Nobukazu WAKABAYASHI, Saburo YAMAMURA

  Along with the appearance of distributed concept, traditional centralized management framework has been transferred to distributed management framework, especially in electronic commerce field. In the technical implementation level, because relational database technology is already very mature and easy to be implemented in distributed construction, so nowadays electronic business enterprises mostly use relational database management system (RDBMS) to store and manage their data. Although, in fleet management, because of ships cannot access to centric database through general internet construction when they are offshore, the data belong to ships themselves have the necessity of independent self-management. But RDBMS cannot completely satisfy this objective because it is not easy to be divided. In this paper, we propose to use Extensible Markup Language (XML) to construct ship data management model, so then it could be applied for fleet management and future port administration. The data model can be composed of many kinds of information, such as hardware (ship name, ship type, net tonnage, etc), software (schedule, service, passenger, etc) and freight (freight kind, freight charge, deliver country, etc). Multi-level data model can provide the ability for fleet inter-manageinent and communicating function to government related departments for port administration.

  Japan Institute of Navigation, Mar. 2008, 日本航海学会論文集, 第118号, pp.65-72, 65 - 72, English

  [Refereed]

  Scientific journal


• 津波来襲時のLNG船の避難ガイドラインの検討

  Kobayashi Eiiichi, Wakabayashi Nobukazu, Koshimura Shunichi, Yoneda Shouta

  2008, 第20回海洋工学シンポジウム, Japanese

  [Refereed]

  Scientific journal


• Guidelines for Ship Evacuation from a Tsunami Attack

  Eiichi Kobayashi, Syunichi Koshimura, Shouta Yoneda

  2008, PROCEEDINGS OF THE EIGHTEENTH (2008) INTERNATIONAL OFFSHORE AND POLAR ENGINEERING CONFERENCE, VOL 3, pp.385-398, 536 - +, English

  [Refereed]

  International conference proceedings


• Construction of Context and User Models under Ubiquitous Envirionment and its Application for Onboard Information Management

  Chia-Hung SHIH, Nobukazu WAKABAYASHI, Saburo YAMAMURA

  Japan Institute of Navigation, Nov. 2007, Asia Navigation Conference 2007, pp.260-268, 16 - 16, English

  [Refereed]

  International conference proceedings


• ナビゲーションシステムにおける機能・操作性と情報提示方法に関する研究

  Nobukazu WAKABAYASHI, Juri HARADA, Chia-Hung SHIH, Koji MURAI

  ECDIS is being used as a navigation system now. It thought whether it was a system for which it is able to be used effectively, the function in the navigation system was dug up based on the result, and the presentation method was examined with classes of information that had to present it. We are developing XNavi as a system that can be used more easily, and necessary functions and operation method for the navigation system have been achieved in the XNavi system. Moreover, the new method of presenting information is designed, and the attempt to improve the problem of ECDIS will be described in this paper.

  Lead, Japan Institute of Navigation, Sep. 2007, 日本航海学会論文集, 第117号,pp.49-58, 49 - 58, Japanese

  [Refereed]

  Scientific journal


• AISを用いた大阪湾海上交通流データベースシステムの開発

  Nobukazu WAKABAYASHI, Shigeaki SHIOTANI, Eiichi KOBAYASHI, Ruri SHOJI

  For sea traffic data acquisition we have ; direct observation, radar image and radar ARPA. This is the basic method today of analyzing sea traffic. Nowadays, the number of AIS equipped ships is increasing, so that sea traffic can be more readily observed by AIS. In this paper, we propose creating a sea traffic database system using AIS. Also, the outline and conclusion of such a system in Osaka bay is described. This system would aim to offer sea traffic data for analysis and in various fields.

  Lead, Japan Institute of Navigation, Sep. 2007, 日本航海学会論文集, 第117号,pp.19-26, 19 - 26, Japanese

  [Refereed]

  Scientific journal


• 潮流シミュレーションを用いた航海への潮流の影響の調査について

  Haibo XIA, Shigeaki SHIOTANI, Atsumasa MANDA, Eiichi KOBAYASHI, Nobukazu WAKABAYASHI

  This paper deals with the simulation of navigation based on the tidal current for the purpose of the optimum routing of a small vessel which sails in the relatively narrow sea area such as the bay. In former part of this paper, the computer simulation of tidal currents of Osaka Bay was explained. The tidal current was calculated using M2 tide by numerical model of POM. In latter parts of one, the simulation of navigation in the bay was carried out. The effects of tidal currents to navigation by a small vessel were examined. As results, it was recognized that effects of tidal currents to navigation are very large and that the tidal simulation for the weather routing of a small vessel is very effective.

  Japan Institute of Navigation, Mar. 2007, THE JOURNAL OF JAPAN INSTITUTE OF NAVIGATION, THE 第116号, pp.61-67, 61 - 67, Japanese

  [Refereed]

  Scientific journal


• A Swing Control of CPP Ship at Riding to a Single Anchor

  YANO Yoshiji, WAKABAYASHI Nobukazu

  To secure a safe anchor riding under stormy weather, the captain judges to use both bower anchors for reinforce the holding power or judges to use a single anchor with dropping another bower as a short-scope anchor. If the swing control of a ship can be done, the power of wind pressure can be reduced. Then, the ship will maintain a safe anchor riding. Training ship Fukae-maru, the faculty of maritime sciences Kobe University, adopts CPP (Controllable Pitch Propeller) as a propulsion system. So, she can control the propeller thrust, ahead and astern, easily. Various experiments about the swing control of a ship were done by using astern thrust of it. As a result of the analysis, the suitable astern thrust was effective on the swing control of a ship because of the reduction of swing room and wind pressure. The authors are expecting that this analytical result will be useful as one example concerning swing control of a CPP ship under stormy weather.

  Last, Japan Institute of Navigation, Mar. 2007, THE JOURNAL of JAPAN INSTITUTE of NAVIGATION, No.116, pp.145-151, 145 - 151, Japanese

  [Refereed]

  Scientific journal


• Estimation of Ship's Course for Sailing on Route by Navigation Simulation in Coastal Water

  Haibo XIA, Shigeaki SHIOTANI, Eiichi KOBAYASHI, Nobukazu WAKABAYASHI

  Ship weather routing system for transoceanic vessels has been studied for many years to achieve an economic and safe navigation. However, little is known about that for coastal sailing vessels. The purpose of this research is to develop a weather routing system for small vessels. We call it numerical navigation system. This paper mainly discusses one of its important functions: the ability for a vessel to sailing on the planned route as precisely as possible. First, the outline of the numerical navigation system is introduced, and then a navigation simulation based on MMG mathematical model is revealed. Finally, on-board experiments are conducted and compared with the navigation simulation. The results confirm that the estimation accuracy of ship's course for the weather routing system is satisfactory.

  Last, Japan Institute of Navigation, Sep. 2006, THE JOURNAL OF JAPAN INSTITUTE OF NAVIGATION, 第115号, pp.51-57, 51 - 57, English

  [Refereed]

  Scientific journal


• Constructing shipboard LAN system using wireless LAN technology and its Application to the ship monitoring system

  MIWA TAKASHI, WAKABAYASHI Nobukazu, YANO YOSHIJI

  The regulation to enforce improvement of security level was executed in 2004. Ships which are obliged should take the cost for introduction of new security system. We tried to construct on-board LAN using wireless technology aboard existent ship in operation, in order to utilize ship's monitoring system. In this paper, we describe outline of implementation of on-board LAN system aboard T. S. Fukae-maru and conclusion of the radio intensity measurement of wireless LAN, also describe ship monitoring system utilizing network camera as a practical application of the LAN.

  Japan Institute of Navigation, Mar. 2006, THE JOURNAL OF JAPAN INSTITUTE OF NAVIGATION, 第114号,pp.243-250, 243 - 250, Japanese

  [Refereed]

  Scientific journal


• A Yawing Movement under Dragging Anchor and Detection of Dragging Anchor in Real Ship

  YANO Yoshiji, WAKABAYASHI Nobukazu

  Training ship Fukae maru of the Faculty of Maritime Sciences, Kobe University encountered the Typhoon No.16 (CHABA) at Ikeda-bay of Syodo-sima in Seto inland sea on August 30, 2004. At that time, she evaded the crisis of dragging anchor twice. And the maximum instantaneous wind speed 61 meters were observed through this violent stormy weather. However, it is not easy to detect accurately the ship yawing, swinging room and anchor dragging on a chart due to the limitation of reduced scale of a chart. So far, anchor dragging or threat of anchor dragging is often judged by anchoring condition such as abnormal ship yawing and abnormal relative wind direction. Our developing "Monitor System for Anchor Riding" detected the situation of the yawing movement of a ship in detail before and after dragging anchor. Then, the anchoring data that had been recorded with this system was analyzed and reproduced. The authors are expecting that this analytical result in high accuracy will be useful as one example concerning anchor dragging phenomenon in real ship under stormy weather.

  Last, Japan Institute of Navigation, Mar. 2006, THE JOURNAL of JAPAN INSTITUTE of NAVIGATION, 第114号・pp.119-125, 119 - 125, Japanese

  [Refereed]

  Scientific journal


• Improvement of Search Procedure for Course Line Generation System using Course Line Parts

  Yoshihiro ISHI, WAKABAYASHI Nobukazu, Youhei TAMURA

  At present, the task of making navigation schedules, and the inputting of schedule data into modern navigational systems, such as ECDIS, is a time consuming business. We have proposed a method to make a supporting system for generation of course lines. We believe that the method has the advantage of flexibility over the usual method of the retrieval of the recorded course lines. In this paper, we improve the efficiency of search algorithm, increase the numbers of Course parts, and combine the graphic user interface. The search algorithm is improved by get rid of unreasonable parts and courses within the search process, the number of parts is 3 times over than before, the GUI is more friendly to use, newly-increased map display ability allow user to zoom the map to the best look for himself. All those improvement make the system more useful and reasonable.

  Japan Institute of Navigation, Mar. 2006, THE JOURNAL OF JAPAN INSTITUTE OF NAVIGATION, 第114号,pp.73-80, 73 - 80, Japanese

  [Refereed]

  Scientific journal


• 実小型船を用いた風圧力による横流れの計測実験とシミュレーションについて

  Haibo XIA, Shigeaki SHIOTANI, Eiichi KOBAYASHI, Nobukazu WAKABAYSHI

  The final objects of this research are the construction of the weather routing system for a relatively small ship sailing in the coastal sea area and the assessment of this system for effects of safety and economic navigation. At the first step of these objects, this paper deals with the estimation method of the ship position considering the ship maneuverability. The simulation results of a sailing ship in the wind were compared with the field's experimental results using an actual small ship. Comparing the simulated rhumb lines of a ship with the experimental ones, Both results showed reasonably good agreement.

  Japan Institute of Navigation, Sep. 2005, THE JOURNAL OF JAPAN INSTITUTE OF NAVIGATION, 第113号,pp.171-177, 171 - 177, Japanese

  [Refereed]

  Scientific journal


• An Analysis of Anchoring Behaviour for T.S. FUKAE MARU

  Nobukazu WAKABAYASHI, Yoshiji YANO, Rie KAWABATA

  Nowadays, progress is remarkable in the field of nautical instruments, such as GPS and others, and which can be utilized to acquire the precise ship position. We are developing a monitoring system for riding at anchor, and the data is taken from the modern electronic instruments aboard T.S. FUKAE MARU. At Kobe University we operated this monitoring system for more than 2 years, and during actual voyage conditions. It was used for the prediction and warning of-anchor dragging. When we observed on monitoring screens, the ship's motion in terms of the anchoring, our new system found not only the regular swinging of the ship, but also some irregular swinging. In order to help the officer of the watch to judge the anchoring status, we analyzed the ship's motion during 47 anchorings of T.S. FUKAE MARU. As a result, we can classify three patterns of swinging; 'Regular swinging', 'Circular movement focused on the bow' and 'Bulbous = Irregular concentrated movement'. The details of this research, with some discussion included, are given in this paper.

  Lead, Japan Institute of Navigation, Mar. 2005, THE JOURNAL OF JAPAN INSTITUTE OF NAVIGATION, 第112号,pp.323-329, 323 - 329, Japanese

  [Refereed]

  Scientific journal


• A Supporting System for Course Line Generation using Course Line Parts

  WAKABAYASHI NOBUKAZU, FUJII MICHIO

  At present, the task of making navigation schedules, and the inputting of schedule data into modern navigational systems, such as ECDIS, is a time consuming business. So, we propose in this paper a method to make a supporting system for the generation of course lines and, which can be used during the sea passage. We believe that this method has the advantage of flexibility and efficiency over the usual method of the retrieval of the recorded course lines. This system can automatically generate course line data via the input of departure and arrival information. By the constructing of the course line parts, those which have been divided beforehand into smaller sections of the course line, and by the automatic generation of on-line data of course lines, our system can save substantial time.

  Lead, Japan Institute of Navigation, Mar. 2005, THE JOURNAL OF JAPAN INSTITUTE OF NAVIGATION, 第112号,pp.101-108, 101 - 108, Japanese

  [Refereed]

  Scientific journal


• リアルタイム気象海象データを考慮した沿岸海域航行船舶のウエザー・ルーチングに関する研究－船舶操縦性能を考慮した船位決定の基礎的シミュレーションと実船実験－

  Haibo XIA, Shigeaki SHIOTANI, Eiichi KOBAYASHI, Nobukazu WAKABAYASHI

  The final objects of this research are the construction of the weather routing system for a relatively small ship sailing in the coastal sea area and the assessment of this system for effects of safety and economic navigation. The weather routing is the optimum navigation based on weather and sea conditions which vary at real time. At first step of these objects, this paper deals with the estimation method of the ship position considering the ship maneuverability. The simulation results of a sailing ship in the tidal current were compared with the field's experimental results using an actual small ship. Comparing the simulated rhumb lines of a ship with the experimental ones, they showed reasonably good agreement. It was concluded that this simulation method for the ship positioning was effective for the weather routing system.

  THE JAPAN SOCIETY OF NAVAL ARCHITECTS AND OCEAN ENGINEERS, Mar. 2005, 関西造船協会論文集, 第243号,pp.159-166(243) (243), 159 - 166, Japanese

  [Refereed]

  Scientific journal


• 練習船深江丸の錨泊監視システムの開発と運用

  Yoshiji YANO, Nobukazu WAKABAYASHI

  Last, Jul. 2004, 神戸大学海事科学部紀要, 第1号,pp.27-32, Japanese

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Airborne polarimetric SAR monitoring for ships and coastal seas

  K Kozai, H Ishida, N Koguchi, N Wakabayashi, Y Yano, M Hayashi

  2004, OCEANS '04 MTS/IEEE TECHNO-OCEAN '04, VOLS 1- 2, CONFERENCE PROCEEDINGS, VOLS. 1-4, 1821 - 1824, English

  [Refereed]

  International conference proceedings


• Sailing Data Transfer and Display System Using Wireless LAN in the Bridge and its Application to Navigation Support System

  Nozukazu WAKABAYASHI, Yoshiji YANO, Shigeaki SHIOTANI, Koji MURAI

  Lead, Oct. 2003, 11th IAIN (International Association of Institutes of Navigation) World Congress, CD-ROM, 1 - 13, English

  [Refereed]

  International conference proceedings


• Effects of Tidal Currents and Wind on Optimum Navigation

  Shigeaki Shiotani, Hiroshi Ishida, Yuji Hayashi, Nobuyoshi Kouguchi, Nobukazu Wakabayashi, Mitsuru Hayashi, Koji Murai

  Oct. 2003, Proceedings of the 11th IAIN World Congress, CD-ROM, English

  [Refereed]

  International conference proceedings


• Basic Study on Evaluation of BTM Effects with Heart Rate Variability

  MURAI Koji, HAYASHI Yuji, SHIOTANI Shigeaki, WAKABAYASHI Nobukazu

  Rate変数をもつBTM効果の推定に関する研究の基礎を確立した。

  Oct. 2003, Proceedings of the 11th International Association of Institute of Navigation (IAIN) World Congress, CD-ROM, English

  [Refereed]

  International conference proceedings


• The Experiment of Transferring Realtime Navigation Data from Ship to Land Using Inmarsat Fleet77

  Nobukazu WAKABAYASHI

  Japan Institute of Navigation, Sep. 2003, Navigation, Vol.157,pp.63-71, 63 - 71, Japanese

  Scientific journal


• An Application of Navigation Information Display System of Training Ship "Fukae-maru" to Monitor System for Anchoring

  Yoshiji YANO, Nobukazu WAKABAYASHI

  Last, Sep. 2003, 2nd Asia Navigation Conference, pp.53-58, English

  [Refereed]

  International conference proceedings


• 練習船深江丸の錨泊監視システム

  矢野 吉治, 若林 伸和

  Under the strong wind, in general, duty officer on anchor watch confirms the anchor riding by fixing ship position on a chart of the maximum reduced scale. Then, by the situation, the anchor cable is extended further or drop down another bower to keep safe anchor riding based on the provided security standard of a ship. However, it is not easy to detect accurately the ship yawing and swinging room and anchor dragging on a chart from the reason for the limitation of reduced scale of a chart. Anchor dragging or the threat of anchor dragging is often judged by anchor condition such as abnormal yawing and swinging of a ship or abnormal wind direction to a ship. The authors have developed the monitor system of ship movement and anchor position at anchor riding and set up this system on training ship "Fukae-maru" of Kobe University of Mercantile Marine. Then the ability of this system has been evaluated for about one year aiming at a further improvement. As a result, the effectiveness of this monitor system was confirmed at anchor riding of a ship.

  Last, Japan Institute of Navigation, 2003, 日本航海学会論文集, No.109,pp.119-124, 119 - 124, Japanese

  [Refereed]

  Scientific journal


• 練習船深江丸の航海情報表示システム

  矢野 吉治, 若林 伸和

  Last, Kobe University, 2003, 神戸商船大学紀要 第二類 商船・理工学篇, No.51,pp.121-125, 121 - 125, Japanese

  Scientific journal


• A basic study on navigator's mental workload by wavelet transform

  K Murai, Y Hayashi, N Wakabayashi

  2003, 2003 IEEE PACIFIC RIM CONFERENCE ON COMMUNICATIONS, COMPUTERS, AND SIGNAL PROCESSING, VOLS 1 AND 2, CONFERENCE PROCEEDINGS, pp.1016-1019, 1016 - 1019, English

  [Refereed]

  International conference proceedings


• Support System for Passage Plan by Using Landmark Tables

  Yuji Hayashi, Nobukazu Wakabayashi, Tadahiro Kitahashi

  Sep. 2002, IEEJ Transactions on Industry Applications, 122(1) (1), 58 - 65, English

  [Refereed]

  Scientific journal


• An Application of Sailing Data Acquisition and Transfer System to Supporting System for Ship Handling in Harbour -System Development on T.S. Fukae-maru-

  Nobukazu WAKABAYASHI, Yoshiji YANO

  Lead, Sep. 2002, 1st Asia Navigation Conference (CIN-JIN-KINPR Joint Symposium 2002), pp.161-168, English

  [Refereed]

  International conference proceedings


• IP ネットワークを利用した航海データ収集・輸送システムの開発 －練習船深江丸における実装－

  WAKABAYASHI NOBUKAZU, YANO YOSHIJI, HAYASHI YUJI, MURAI KOJI

  T.S. Fukae-maru has 100Mbps FDDI network (Ship's LAN for short). IP network is running on the Ship's LAN. In T.S. Fukae-maru, many kinds of sensor that measures various kinds of data are connected to the Ship's LAN through sequencers. It is possible to get these measured data with IP communication. Using this feature, authors design the server program that receives the data from sequencers periodically, and transfers the data on user request. A client program sends a request to the server program, and displays/processes the data that is received from the server program. These two programs are executed as different processes. The IP protocol is utilized in the communication between both processes. Authors propose that data acquisition/transfer system is composed with such server-client model. The computers require just reguler connection to the network through the interface like Ethernet but any other special connection to the measuring devices. By connecting the computer to the Ship's LAN, users are able to utilize data in various places in T.S. Fukae-maru. In this paper, we describe the method of the system design with server-client model and some cases of its application. As the first step, experiments by prototype system and data display system by graphics are explained.

  Lead, 日本航海学会, Mar. 2002, 日本航海学会論文集, 106(106) (106), 29 - 37, Japanese

  [Refereed]

  Scientific journal


• ランドマーク・テーブルを用いた航路選定支援システム

  HAYASHI YUJI, WAKABAYASHI NOBUKAZU, 北橋忠宏

  電気学会, Jan. 2002, 電気学会論文誌Ｄ編, 122-D(1) (1), 58 - 65, Japanese

  [Refereed]

  Scientific journal


• ランドマーク･テーブルとコースラインによる水路誌記載情報の獲得

  HAYASHI YUJI, 若林 伸和, 村井 康二, 河口 信義

  Currently ship navigators must manually pick up necessary navigational information from many kinds of printed matters. It is very hard and headachy work for them to retrieve the useful information on board. In this paper, we propose an automatic retrieval system for sailing directions, which is composed of a general-purpose database, a retrieval engine and a user-friendly interface. When the user inputs a navigational route in terms of the departure port, altering points and arrival port on the chart shown on their workstation's graphic display by its mouse pointer device, the system can retrieve relevant landmarks for the route. The database of sailing directions for our retrieval system currently contains only data for 'Seto Inland Sea.' When the user selects a landmark of the landmark list on the graphic display, the system can retrieve and show the contents about the selected landmark. Our system can save time considerably compared with manual operation. Moreover, it retrieves relevant navigational information from the database without any omissions.

  Japan Institute of Navigation, Sep. 2001, 日本航海学会論文集, 105(105号) (105号), pp.103 - 109, Japanese

  [Refereed]

  Scientific journal


• Web化水路誌データベースの見出し語による検索

  Nobukazu WAKABAYASHI, Yuji HAYASHI

  This paper presents a methodology for retrieving sailing guides from a web-based sailing direction database. The basic idea is to build and utilize an index table, which relates the keywords extracted from the sailing direction to the URL's of the relevant pages. The topics covered in this paper spread from the basics about database design such as data modelling to the considerations for the search engine of the retrieval system. The major issues discussed include : 1. how to utilize the existing HTML framework with no modification ; 2. how to simplify and automate the procedures for data recording and updating ; and 3. how to design the search engine so that the fast and accurate retrieval of relevant pages could be achieved. Our experimental results show that with the use of the index table, the retrieval time has been considerably shortened.

  Lead, Japan Institute of Navigation, Sep. 2001, THE JOURNALOF JAPAN INSTITUTE OF NAVIGATION, 第105号,pp.119-126, 119 - 126, Japanese

  [Refereed]

  Scientific journal


• Retrieval and small correction system for sailing directions using the Internet

  Y Hayashi, N Wakabayashi, K Murai

  2001, 2001 IEEE PACIFIC RIM CONFERENCE ON COMMUNICATIONS, COMPUTERS AND SIGNAL PROCESSING, VOLS I AND II, CONFERENCE PROCEEDINGS, pp.95-98, 95 - 98, English

  [Refereed]

  International conference proceedings


• Analysis of heart rate variability of navigator at in/from ports by wavelet transform - On ship handling of training ship and ship's bridge simulator

  K Murai, Y Hayashi, N Wakabayashi

  2001, 2001 IEEE PACIFIC RIM CONFERENCE ON COMMUNICATIONS, COMPUTERS AND SIGNAL PROCESSING, VOLS I AND II, CONFERENCE PROCEEDINGS, pp.681-685, 681 - 685, English

  [Refereed]

  International conference proceedings


• Database System of Static Navigational Information for Ship's Sailing(Session 3: Maritime navigation infrastructure,IAIN '97)

  WAKABAYASHI Nobukazu, HAYASHI Yuji, WAKE Hirotsugu, KITAHASHI Tadahiro

  Japan Institute of Navigation, 1998, NAVIGATION, 135, 5 - 6, Japanese


• Database System for Static Navigational Information for Ship’s Sailing

  Nobukazu Wakabayashi, Yuji Hayashi, Hirotsugu Wake, Tadahiro Kitahashi

  Lead, IAIN'97, Oct. 1997, Proceedings of 9th Congress of International Association of Institutes of Navigation (IAIN'97), 125 - 132, English

  [Refereed]

  International conference proceedings


• 航海情報のデータベース化とその検索・表示方法についての研究

  WAKABAYASHI NOBUKAZU, HAYASHI YUJI, 南里崇史, 和氣博嗣

  Navigation information is necessary for safe and efficient ship handling. Ship navigators must pick up manually necessary navigation information from a vast amount of them. In this paper, we propose automatic retrieval systems for Japanese nautical charts and sailing directions using an engineering work station (EWS), and develop its prototype. These systems are composed of general purpose database, unified retrieval algorithm and user-friendly interface. The database of nautical charts retrieval system is composed nautical charts attribute data of 781 sheets of Japanese nautical charts in Japan adjacent waters. When the system operator inputs main points of departure, arrival and altering points on the general chart in the EWS's graphic display by its mouse pointer device, the system retrieves necessary charts for the inputted course line. The database for sailing direction retrieval system is composed of 'Seto Inland Sea' sailing direction. The mentioned items of sailing direction are classified to 2,000 areas and items. When the system operator selects the item of operation menus in the graphic display, the system can retrieve and show the necessary information of the sailing direction in the graphic display. When the operators use these systems, they can reduce the operation time compared with manual operation. Of course, they can get necessary navigation information from the database without omission.

  Lead, 日本航海学会, Mar. 1996, 日本航海学会論文集, 94(94) (94), 249 - 255, Japanese

  [Refereed]

  Scientific journal


• Database concept for static navigational information

  Y Hayashi, N Wakabayashi, T Nanri, H Wake

  1996, IEEE 1996 POSITION LOCATION AND NAVIGATION SYMPOSIUM, 96 - 102, English

  [Refereed]

  International conference proceedings


• User-friendly Navigation Information Retrieval System

  Yuji Hayashi, Nobukazu Wakabayashi, Tadahiro Kitahashi

  European Space Report, May 1995, Proceedings of Navigation & Communication for Maritime & Land Mobile Applications, Space Congress (European Space Report), 71 - 77, English

  [Refereed]

  International conference proceedings


• Computation of the True Course of the Target Ship from its Image at Sea(IAIN'94)

  HAYASHI Yuji, WAKABAYASHI Nobukazu, KITAHASHI Tadahiro, WAKE Hirotsugu

  Japan Institute of Navigation, 1995, NAVIGATION, 123, 17 - 22, Japanese


• Computation of the True Course of the Target Ship from its Image at Sea

  Yuji Hayashi, Nobukazu Wakabayashi, Tadahiro Kitahashi, Hirotsugu Wake

  IAIN'94, Sep. 1994, Proceedings of 8th Congress of International Association of Institutes of Navigation (IAIN'94), 147 - 154, English

  [Refereed]

  International conference proceedings


• AN IMAGE RANGING SYSTEM AT SEA

  Y HAYASHI, N WAKABAYASHI, T KITAHASHI, H WAKE

  1994, IEEE 1994 POSITION LOCATION AND NAVIGATION SYMPOSIUM, 113 - 120, English

  [Refereed]

  International conference proceedings


• 他船実画像からの船舶間相対距離算出に関する研究

  HAYASHI YUJI, WAKABAYASHI NOBUKAZU, 北橋忠宏

  電気学会, Dec. 1993, 電気学会論文誌Ｃ編, 113-C(12) (12), 101 - 109, Japanese

  [Refereed]

  Scientific journal


• 他船実画像からの航行情報抽出方法についての研究-Ⅲ －画像処理専用機と特定線分抽出アルゴリズムを利用した高速化－

  HAYASHI YUJI, WAKABAYASHI NOBUKAZU, 北橋忠宏, 和氣博嗣

  日本航海学会, Sep. 1993, 日本航海学会論文集, (89) (89), 179 - 186, Japanese

  [Refereed]

  Scientific journal


• Automatic Generation System for NC Punch Press Machine using Pattern Recognition Method

  Nobukazu Wakabayashi, Tadahiro Kitahashi

  An automatic program generation system for NC punch press machine is proposed. NC programs to control machine tools can be generated automatically by the system according to the data described in the design drawing of final products.
  In this system, silhouette decomposition procedure which is one of pattern recognition techniques is employed to recognize the drawing. The procedure is applied to decompose a complex shaped hole in the design drawing into punch primitives, where the shaped hole and the punch primitives correspond to the overlapped silhouette and the discrete components of it, respectively.
  The outline of the developed silhouette decomposition procedure and automatic program generation system is given.

  Lead, The Institute of Electrical Engineers of Japan, Jun. 1993, IEEJ Transactions on Sensors and Micromachines, 113-D(6) (6), 778 - 785, Japanese

  [Refereed]

  Scientific journal


• An Application of Silhouette Decomposition to Automatic Generation System for Making NC Programs

  N. Wakabayashi, T. Kitahashi, T. Mimaki

  Lead, Jul. 1992, Proceedings of the 1992 IEEE/RSJ International Conference on Intelligent Robots and Systems, 2, 742 - 749, English

  [Refereed]

  International conference proceedings


• 他船実画像からの航行情報抽出方法についての研究-Ⅱ

  HAYASHI YUJI, WAKABAYASHI NOBUKAZU, 和氣博嗣

  In an experimental automatic navigation system, an ARPA is currently employed as a sensor to obtain navigation information about ships in the radar visibility. Consequently the ARPA is expected to have an equivalent capability to ship operator's eyesight. Some researchers are engaged in developing such an advanced ARPA. However, the advanced ARPA alone can not assure high reliability, simply because it gives us only a single kind of sensor information. From this point of view, we have focused on image understanding techniques for mechanization of ship operator's eyesight, and studied an extraction of navigation information from an image of a ship at sea. In last paper, we described 1) a derivation of theoretical equations for calculating the distance between a target and an own ship using a position of a horizon and 2) a verification of their efficiency with Digitizer Distance Measuring System (OMS). As the next step in developing a practical system, we have implemented semiautomatic distance measuring system, Mouse Distance Measuring System (MOMS). MOMS consists of an engineering workstation (EWS) and an image scanner as the hardware. An input image is fed into the EWS by the scanner and processed for edge detection, binarization and thinning. The coordinates (x, y) of important points are, then, extracted from the processed image on the display by clicking the mouse. In this paper, we explain MOMS in detail and that its accuracy is enough in some practical situations.

  日本航海学会, Sep. 1991, 日本航海学会論文集, 85(85) (85), 143 - 151, Japanese

  [Refereed]

  Scientific journal


• A Supporting System for Making NC Programs by way of Knowledge Engineering Approach

  N. Wakabayashi, N. Honda, T. Mimaki, S. Matsumoto

  Lead, Nov. 1989, SKILL BASED AUTOMATED PRODUCTION, Selected Papers from the IFAC/IFIP/IMACS Symposium, Edited by P. Kopacek and R. Genser, PERGAMON PRESS Symposium, Edited by P. Kopacek and R. Genser, PERGAMON PRESS, 213 - 218, English

  [Refereed]

  International conference proceedings