Europe Oceans 2005最新文献_第2页

Multi-scale MAP despeckling of sonar images 声纳图像的多尺度MAP消斑

Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1513246

A. Isar, D. Isar, S. Moga, J. Augustin, X. Lurton

引用次数: 12

Hybrid wavelet-Hilbert-Huang spectrum analysis 混合小波-希尔伯特-黄谱分析

Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1513176

Fu-Tai Wang, Shun-Hsyung Chang, J.C.-Y. Lee

引用次数: 5

Cetacean biosonar and noise pollution 鲸类生物声呐和噪声污染

Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1513199

M. André, T. Johansson, E. Delory, M. van der Schaar

{"title":"Cetacean biosonar and noise pollution","authors":"M. André, T. Johansson, E. Delory, M. van der Schaar","doi":"10.1109/OCEANSE.2005.1513199","DOIUrl":"https://doi.org/10.1109/OCEANSE.2005.1513199","url":null,"abstract":"Noise pollution in the marine environment is an emerging but serious concern. Its implications are less well understood than other global threats and largely undetectable to everyone but the specialist. In addition, the assessment of the acoustic impact of artificial sounds in the sea is not a trivial task, certainly because there is a lack of information on how the marine organisms process and analyze sounds and how relevant these sounds are for the balance and development of the populations. Further, this possible acoustic impact not only concerns the hearing systems but may also affect other sensory or systemic levels and result equally lethal for the animal concerned. If we add that the negative consequences of a short or long term exposure to artificial sounds may not be immediately observed one can understood how challenging it is to obtain objective data allowing an efficient control of the introduction of anthropogenic sound in the sea. To answer some of these questions, the choice to investigate cetaceans and their adaptation to an aquatic environment is not fortuitous. Cetaceans, because of their optimum use of sound as an ad-hoc source of energy and their almost exclusive dependence on acoustic information, represent not only the best bio-indicator of the effects of noise pollution in the marine environment, but also a source of data to improve and develop human underwater acoustic technology. Here, we present how the characteristics and performance of the sperm whale mid-range biosonar can be used to develop a mitigation solution based on passive acoustics and ambient noise imaging to prevent negative interactions with human activities by monitoring cetacean movements in areas of interest.","PeriodicalId":120840,"journal":{"name":"Europe Oceans 2005","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124216228","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: 6

GIS usage in planning of marine area assignment - case study 地理信息系统在海洋区域分配规划中的应用-案例研究

Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1511711

V. Dadic, M. Srdelić, D. Ivanković

引用次数: 0

Observation of breakwaters and their rock mound by AUV "Tri-Dog 1" at Kamaishi Bay “三狗1号”AUV在釜石湾观察防波堤及其岩石丘

Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1511780

H. Kondo, T. Maki, T. Ura, T. Sakamaki

引用次数: 18

First tests of the DORT method at 12 kHz in a shallow water waveguide 在浅水波导中对12khz的波特法进行了首次测试

Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1513230

D. Clorennec, J. de Rosny, Jérôme Minonzio, C. Prada, M. Fink, T. Folégot, P. Billand, S. Tauvry, S. Hibral, L. Berniere

引用次数: 2

Neptus - a framework to support multiple vehicle operation 海王星-一个支持多车辆操作的框架

Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1513187

P. Dias, S. L. Fraga, Rui M. F. Gomes, G. Gonçalves, F. Pereira, J. Pinto, J. Sousa

引用次数: 63

Embedded intelligent supervision and piloting for oceanographic AUV 海洋水下航行器嵌入式智能监控与导航

Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1513174

Laurent Nana, Frank Singhoff, J. Legrand, J. Vareille, P. L. Parc, F. Monin, D. Masse, L. Marcé, J. Opderbecke, M. Perrier, V. Rigaud

引用次数: 7

Optical configurations for oceanographic applications of eHolography 海洋全息摄影应用的光学结构

Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1513232

J. Watson, H. Sun, D. C. Hendry, M. Player

{"title":"Optical configurations for oceanographic applications of eHolography","authors":"J. Watson, H. Sun, D. C. Hendry, M. Player","doi":"10.1109/OCEANSE.2005.1513232","DOIUrl":"https://doi.org/10.1109/OCEANSE.2005.1513232","url":null,"abstract":"eHolography (electronic or digital holography) has been used for observing and measuring particle size and distribution in biomedicine, sedimentology and oceanology. In these areas, eHolography possesses advantages over other imaging techniques in terms of its capability for recording live organisms (e.g. plankton) or events (e.g. sediment erosion) in a non-disturbed environment. Compared with classical holography, an eHoIogram is recorded digitally on an electronic imaging sensor and reconstructed numerically, to produce a three-dimensional map of the scene. In this paper, we present our progress in developing an electronic Holographic Camera for high-resolution imaging, both subsea and in air (eHoloCam). Many optical configurations have been successfully used in classical (photographic) holography, including a back-illuminating inline beam with and without a separated reference beam, and side/front illuminated object with an off-axis reference beam. For eHolography, it is necessary to reexamine these and other optical geometries with specific reference to the constraints of reduced resolution and recording area of current CCD or CMOS imaging sensors. For example, using a divergent beam in recording back-illuminated in-line eHolograms can give an improvement in image resolution over the more usual collimated beam geometry. Furthermore, when using an off-axis beam in eHolography considerable limitations are encountered in obtaining useable holograms, such as the need to record at small reference beam angles. In this paper, we will discuss the various geometries we have used to overcome these difficulties.","PeriodicalId":120840,"journal":{"name":"Europe Oceans 2005","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130117573","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

Low-frequency attenuation of sound in marine sediments 海洋沉积物中声音的低频衰减

Europe Oceans 2005 Pub Date : 2005-06-20 DOI: 10.1109/OCEANSE.2005.1513242

A. Pierce, W. M. Carey, M. Zampolli

{"title":"Low-frequency attenuation of sound in marine sediments","authors":"A. Pierce, W. M. Carey, M. Zampolli","doi":"10.1109/OCEANSE.2005.1513242","DOIUrl":"https://doi.org/10.1109/OCEANSE.2005.1513242","url":null,"abstract":"Data on low frequency attenuation in marine sediments is surveyed and evidence is cited for the attenuation coefficient at such frequencies being something other than directly proportional to frequency. The original model of Biot for propagation in porous media is examined and simplified versions are derived for the low frequency limit. Acoustic waves are governed by a wave equation of the standard form, but with an additional terms that is proportional to the third time derivative. The \"slow wave\" disturbances are governed by a simple diffusion equation, such as results from Darcy's law. In this limit, the model predicts for acoustic waves an attenuation coefficient that is proportional to the square of the frequency and inversely proportional to viscosity. It is shown that this model also implies that the attenuation for fixed frequency and porosity should be proportional to the square of the grain size. The commonly used hybrid model, commonly referred to as the Biot-Stoll model, is subsequently examined in the low frequency limit, and it is shown that this model always predicts an attenuation coefficient varying linearly with frequency in the low frequency limit, as the linear term will always dominate the quadratic term if the frequency is sufficiently low. An alternate to the Biot-Stoll model is proposed in which the nonviscous attenuation is regarded as caused by a continuous distribution of relaxation processes. The model is characterized by a function g(/spl tau/) that represents the relative contribution per unit range of relaxation time at a given value of relaxation time /spl tau/. It is demonstrated that there is a choice for this function that does lead to a prediction of a linear dependence on frequency. However, a more realistic prediction, in which g has vanishingly small values at lower relaxation times, yields a prediction in which the quadratic term dominates at low frequencies, but a linear dependence is evident for intermediate ranges of frequency.","PeriodicalId":120840,"journal":{"name":"Europe Oceans 2005","volume":"642 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131886450","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: 10