2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO)最新文献_第4页

Characteristic Ocean Flow Visualization Using Helmholtz Decomposition 基于亥姆霍兹分解的特征洋流可视化

2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO) Pub Date : 2018-05-28 DOI: 10.1109/OCEANSKOBE.2018.8559411

Cuicui Zhang, Hao Wei, Zhilei Liu, Xiaomei Fu

{"title":"Characteristic Ocean Flow Visualization Using Helmholtz Decomposition","authors":"Cuicui Zhang, Hao Wei, Zhilei Liu, Xiaomei Fu","doi":"10.1109/OCEANSKOBE.2018.8559411","DOIUrl":"https://doi.org/10.1109/OCEANSKOBE.2018.8559411","url":null,"abstract":"Recently, with the high development of satellite based ocean observation techniques, ocean flow visualization has become a hot research topic in the joint field of computer science and oceanography. It plays a significant role in supporting the detection and recognition of characteristic ocean flows, such as the mesoscale eddies, convergent and divergent ocean flows. However, this is not an easy task. Ocean flow field is a complex velocity field mixing of multi-scale dynamics including large-scale ocean circulations (100km∼)), mesoscale eddies (10km∼) 100km), and sub-mesoscale processes (1km∼10km). These dynamics change their forms and velocities at any time, making existing algorithms difficult to identify them. To solve this problem, this paper developed a novel ocean flow decomposition method using Helmholtz decomposition. In our approach, an arbitrary ocean flow field can be decomposed to two components: curl component and divergence component. Eddies, which are rotational, only present in the curl component; convergent and divergent ocean flows, which are irrotational, only exist in the divergence component. The Helmholtz decomposition helps us recognize different characteristic ocean flows with different components. To verify our method, experiments are performed on AVISO satellite observed ocean flow field in the Black sea. Experimental result demonstrates the effectiveness of our method.","PeriodicalId":441405,"journal":{"name":"2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO)","volume":"333 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122833686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Unmanned Surface Vehicle for Managing Parallel Cruising of a Multiple AUVs 多auv并行巡航管理的无人水面航行器

2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO) Pub Date : 2018-05-28 DOI: 10.1109/OCEANSKOBE.2018.8559319

Yuya Nishida, Kazunori Nagano, J. Kojima, H. Kakami, S. Yokota, Takeshi Ohki, T. Nakatani, B. Thornton

引用次数: 6

Heave-Enhanced, Wave Energy Converter, with a Circular Sliding Generator 海浪增强，波浪能量转换器，与一个圆形滑动发电机

2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO) Pub Date : 2018-05-28 DOI: 10.1109/OCEANSKOBE.2018.8559053

H. M. Chen, D. DelBalzo

{"title":"Heave-Enhanced, Wave Energy Converter, with a Circular Sliding Generator","authors":"H. M. Chen, D. DelBalzo","doi":"10.1109/OCEANSKOBE.2018.8559053","DOIUrl":"https://doi.org/10.1109/OCEANSKOBE.2018.8559053","url":null,"abstract":"At Oceans' 13 in San Diego, we introduced the concept of a Circular Sliding Wave Energy Converter (CS-WEC), where a track was fixed to the inside of a floating “wave-rider” buoy, which pitched and rolled in response to waves. At that time, we envisaged a heavy rotating mass on a circular track connected by a pivot arm to a fixed, but spinning, generator plus electronics at the center of the track. The system was adaptively tuned to changing environmental conditions with an artificial electro-magnetic spring in a control loop. We now propose three enhancements to the original design for efficiency and increased power. First, we move the generator, its associated electronics, and re-chargeable battery, from the center position to be part of the rotating mass, without sacrificing power. This is a more efficient way to conserve and better utilize component weights. Second, we move the hermetically-sealed CS-WEC from inside to the outside of the buoy and attach it by 2 pivot points to allow tilts that are greater than those of the sea surface. Third, we anchor the buoy to the sea bottom in shallow water and add a capability to significantly increase power by artificially increasing the magnitude of the pitch/roll motions by using an external surface float on a moment arm. We show a power improvement up to an order of magnitude in realistic ocean conditions (swell and random seas) by increasing the motion.","PeriodicalId":441405,"journal":{"name":"2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122257420","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Modal Frequency Tracking of an Unknown Vibrational System 未知振动系统的模态频率跟踪

2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO) Pub Date : 2018-05-28 DOI: 10.1109/OCEANSKOBE.2018.8558788

J. Candy, L. Stoops, S. Franco, M. Emmons

引用次数: 0

Robust Image Denoising for Sonar Imagery 声纳图像的鲁棒图像去噪

2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO) Pub Date : 2018-05-28 DOI: 10.1109/OCEANSKOBE.2018.8559398

Avi Abu, R. Diamant

{"title":"Robust Image Denoising for Sonar Imagery","authors":"Avi Abu, R. Diamant","doi":"10.1109/OCEANSKOBE.2018.8559398","DOIUrl":"https://doi.org/10.1109/OCEANSKOBE.2018.8559398","url":null,"abstract":"The recent boost in undersea operations has led to the development of high-resolution sonar systems mounted on autonomous vehicles, and aimed to scan the sea floor and detect objects. An important part of sonar detection is the image denoising, where the background is smoothed and noise components are removed while preserving the object's borders. Sonar image denoising is a challenging task, mostly due to the heavy intensity inhomogeneity of the background and the heavy spatial varying background. In this paper, we propose an algorithm for sonar image denoising that is based on the adaptation of the nonlocal means-based filter. The noise in the highlight and background regions is modeled by the exponential distribution, while the noise in the shadow region is modeled by the Gaussian distribution. We estimate the label of each pixel through image segmentation to estimate the parameters of each distribution. Then, the minimum entropy criteria is used to decide which statistics model in the denoising filter gives the best results. Results for synthetic sonar images and over real sonar images demonstrate that the proposed method successfully removes the noise components while preserving the object's edges.","PeriodicalId":441405,"journal":{"name":"2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121527759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

The Effect of Bottom Attenuation on High Frequency Source Localization Using the Frequency Difference MFP 低频衰减对频率差MFP高频源定位的影响

2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO) Pub Date : 2018-05-28 DOI: 10.1109/OCEANSKOBE.2018.8559336

J. Du, T. C. Yang

引用次数: 0

Filling Gaps in Wind Speed Data – A Neural Networks Approach 填补风速数据的空白-一种神经网络方法

2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO) Pub Date : 2018-05-28 DOI: 10.1109/OCEANSKOBE.2018.8559341

M. T. Silva, Weimin Huang, E. Gill

引用次数: 0

Monocular ORB-SLAM Application in Underwater Scenarios 单目ORB-SLAM在水下场景中的应用

2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO) Pub Date : 2018-05-28 DOI: 10.1109/OCEANSKOBE.2018.8559435

Franco Hidalgo, Chris Kahlefendt, T. Bräunl

引用次数: 11

Underwater Acoustic Video Transmission Using MIMO-FBMC 基于MIMO-FBMC的水声视频传输

2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO) Pub Date : 2018-05-28 DOI: 10.1109/OCEANSKOBE.2018.8559160

M. J. Bocus, D. Agrafiotis, A. Doufexi

引用次数: 9

Pinpoint and Safe Installation of a Standalone Seafloor Observatory 精确和安全安装独立的海底观测站

2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO) Pub Date : 2018-05-28 DOI: 10.1109/OCEANSKOBE.2018.8559472

Jin-Kyu Choi, T. Fukuba, Hiroyuki Yamamoto, Y. Furushima, T. Miwa, K. Kawaguchi

{"title":"Pinpoint and Safe Installation of a Standalone Seafloor Observatory","authors":"Jin-Kyu Choi, T. Fukuba, Hiroyuki Yamamoto, Y. Furushima, T. Miwa, K. Kawaguchi","doi":"10.1109/OCEANSKOBE.2018.8559472","DOIUrl":"https://doi.org/10.1109/OCEANSKOBE.2018.8559472","url":null,"abstract":"Environmental impact assessment on the site of ocean resource exploration and exploitation is required to be conducted under regulatory guidelines to protect and preserve ecosystems and biodiversity. Thus, observatories that can achieve long-term monitoring are needed for such a purpose. In connection with this, we have developed a long-term ecosystem monitoring lander, called “LEMON lander,” and an equipment for its pinpoint and safe installation, called “pilot frame.” LEMON lander is attached at the pilot frame on deck and goes down to the seafloor by using an onboard winch. After the pilot frame landed on the seafloor, LEMON lander is released from the pilot frame. The falling distance from the pilot frame is less than 30cm and the safety during falling and landing is assured; moreover, the pilot frame is more than 330kgf in water and this allows to deploy at a target position even under a bit strong current. We have succeeded to deploy two LEMON landers by using the pilot frame for an actual mission. This paper focuses on the installation method using the pilot frame and reports the installation operation for the actual mission, together with brief introduction of LEMON lander.","PeriodicalId":441405,"journal":{"name":"2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO)","volume":"244 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128999195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2