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Li S.,Changjiang Nanjing Waterway Bureau | Wang Y.,Wuhan University of Technology | Xu Y.,Wuhan University of Technology | Yang K.,Wuhan University of Technology | And 2 more authors.
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2014

To solve the quantity shortage and capability lag problems caused by the deep-water channel project constructions, the single boat coverage model based on the speed of the beacon vessel was proposed after analyzing current situation of beacon vessel. The model was revised by the different revise coefficients such as beacon density, bridge density, distributary estuary as well as the flow of ships, then the beacon vessel quantity model was established. The results of calculating the quantity of beacon vessel based on above model in Nanjing, Zhenjiang, Shanghai waterway management districts turned out to be considerable reasonable. Source


Li S.,Changjiang Nanjing Waterway Bureau | Wang Y.,Wuhan University of Technology | Xu Y.,Wuhan University of Technology | Guan H.,Wuhan University of Technology | And 2 more authors.
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2015

Aiming at the characteristics of the Yangtze River Nan-liu section an evaluation index system is set up. Combined the AHP method with the cloud model, a mathematics model of aids to navigation efficiency evaluation is established, then by using the MATLAB GUI tool the Aids to navigation the efficiency evaluation visualization software is developed. Finally, according to the evaluation results some improvements related to the efficiency of Aids to navigation are put forward. ©, 2015, Wuhan University of Technology. All right reserved. Source


Lin W.,Nanjing Normal University | Zhai X.-D.,Changjiang Nanjing Waterway Bureau | Zhu C.-Q.,Nanjing Normal University | Ren N.,Nanjing Normal University
Beijing Youdian Daxue Xuebao/Journal of Beijing University of Posts and Telecommunications | Year: 2015

A blind watermarking algorithm with strong crop and noise resistibility based on quick response (QR) code for remote sensing image was presented. Firstly, QR code image is generated by use of copyright authentication information. Secondly, the QR code image is scrambled based on Arnold transforms, while the error-correction coding method is introduced to pretreat the watermark image. Finally, considering the properties of the data of remote sensing image, the appropriate strength and position are selected to embed watermark. Watermark detection is the inverse process of embedding watermark. Watermark detection is the inverse process of embedding a watermark, and the majority rule is used to extract and self-correct the watermark information bits. The introduction of QR code effectively enhances the capacity and robustness of the watermark information. Embedded watermark based on the premise of keeping the accuracy of features and statistical properties of remote sensing images was studied. The embedded watermark is not only of good invisibility, but also of strong crop and noise resistibility. ©, 2015, Beijing University of Posts and Telecommunications. All right reserved. Source


Pan M.-Y.,Dalian Maritime University | Liu T.,Dalian Maritime University | Dong H.,Changjiang Nanjing Waterway Bureau | Hao J.-L.,Dalian Maritime University | Ju J.,Changjiang Nanjing Waterway Bureau
Dalian Haishi Daxue Xuebao/Journal of Dalian Maritime University | Year: 2013

This paper analyzes the advantages and disadvantages of both two-dimensional electronic navigation chart and three-dimensional waterway model, and puts forward a new multi-dimensional digital waterway model based on the integration of them. The model overlays standard two-dimensional vector electronic navigation chart on the water surface of three-dimensional waterway model to facilitate spatial calculation and analysis for navigation, route plan, management of ship and navigation aid mark. In this way, the model can gain both advantages of electronic navigation chart and three-dimensional waterway model such as accuracy, reality and so on in a unified framework. This paper realizes the multi-dimensional digital waterway model through the virtual earth technology by World Wind Java SDK of NASA, and constructs a basic platform for multi-dimensional ship navigation, ship monitoring, pharos remote control and other digital waterway application systems. Source

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