2013 MTS/IEEE OCEANS - Bergen最新文献_第3页

Geoacoustic characterization of Stone Age cultural layers: Preliminary FE modelling 石器时代文化层的地球声学特征:初步有限元模拟

2013 MTS/IEEE OCEANS - Bergen Pub Date : 2013-06-10 DOI: 10.1109/OCEANS-BERGEN.2013.6608184

J. Hermand, R. Tayong

{"title":"Geoacoustic characterization of Stone Age cultural layers: Preliminary FE modelling","authors":"J. Hermand, R. Tayong","doi":"10.1109/OCEANS-BERGEN.2013.6608184","DOIUrl":"https://doi.org/10.1109/OCEANS-BERGEN.2013.6608184","url":null,"abstract":"The use of acoustic methods to detect and map submerged Stone Age sites is of great importance for both the archaeological and underwater acoustics research. This paper presents a preliminary numerical study for the geoacoustic characterization of Stone Age cultural layers. Finite element modelling tools are used to investigate the feasibility of detecting acoustically a submerged flint. The acoustic response of a flint buried in soft sediment is simulated. A realistic condition of the flint submerged in a cultural layer surrounded by seawater, sand, mud and a substrate layer of Moraine is also presented. A theoretical calculation of flint resonance frequencies shows that depending on their characteristics, they can produce a wide range of frequencies beyond 2 kHz as it has been observed experimentally. In this study, a Ricker wavelet source is used to estimate the total and scattered pressure fields due to a flint sample. Simulation of the wave propagation accounts for the variation of the compressional and shear speeds of sound. To detect the submerged flint, the source contains the determined fundamental resonance obtained at 10.6 kHz. Snapshots for different views around the flint are analyzed to detect the effect of the flint sample. A sharp peak is noticed to appear at the given resonance of about 18% the emitting signal for the flint buried inside 5 cm of a cultural layer environment. The case of the flint buried in 15 cm of cultural layer overlying and 100 cm of sand is also computed and presented. This first step modelling indicates that acoustic probing may detect and localize worked flints buried inside soft sediment environment. The other results obtained are analyzed and discussed. The study support the development of a geoacoustic inverse method to characterize submerged flints cores and blades but also the accumulation of flakes.","PeriodicalId":224246,"journal":{"name":"2013 MTS/IEEE OCEANS - Bergen","volume":"352 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131649374","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: 12

Ultradeep-sea exploration in the Puerto Rico Trench 波多黎各海沟的超深海勘探

2013 MTS/IEEE OCEANS - Bergen Pub Date : 2013-06-10 DOI: 10.1109/OCEANS-BERGEN.2013.6607944

F. Søreide, A. Jamieson

引用次数: 5

A bio-inspired distributed approach for searching underwater acoustic source using a team of AUVs 一种生物启发的分布式方法，用于使用一队auv搜索水下声源

2013 MTS/IEEE OCEANS - Bergen Pub Date : 2013-06-10 DOI: 10.1109/OCEANS-BERGEN.2013.6607954

M. Shaukat, M. Chitre, S. Ong

引用次数: 13

Soft decision feedback equalizer for channels with low SNR in underwater acoustic communications 水声通信中低信噪比信道的软判决反馈均衡器

2013 MTS/IEEE OCEANS - Bergen Pub Date : 2013-06-10 DOI: 10.1109/OCEANS-BERGEN.2013.6608050

Xiaoxia Yang, S. Houcke, C. Laot, Haibin Wang

引用次数: 3

Duplicate reduction with adaptive backoff for a flooding-based underwater network protocol 基于洪水的水下网络协议的自适应回退重复减少

2013 MTS/IEEE OCEANS - Bergen Pub Date : 2013-06-10 DOI: 10.1109/OCEANS-BERGEN.2013.6608038

R. Otnes, S. Haavik

引用次数: 29

Development of fuel cell system for underwater power source 水下动力源燃料电池系统的研制

2013 MTS/IEEE OCEANS - Bergen Pub Date : 2013-06-10 DOI: 10.1109/OCEANS-BERGEN.2013.6608025

T. Hyakudome, H. Yoshida, T. Nakatani, Y. Ohta, Toshihiro Tani, Koki Sugihara, Takuya Moriga, T. Iwamoto, Yoshinori Kawaharazaki, Tomomasa Oda, Yasuhiro Fujita

{"title":"Development of fuel cell system for underwater power source","authors":"T. Hyakudome, H. Yoshida, T. Nakatani, Y. Ohta, Toshihiro Tani, Koki Sugihara, Takuya Moriga, T. Iwamoto, Yoshinori Kawaharazaki, Tomomasa Oda, Yasuhiro Fujita","doi":"10.1109/OCEANS-BERGEN.2013.6608025","DOIUrl":"https://doi.org/10.1109/OCEANS-BERGEN.2013.6608025","url":null,"abstract":"Research for the global warming, submarine earthquake or any ocean environmental fluctuation needs huge range observation. In order to gather various seawater data efficiently, Autonomous Underwater Vehicle (AUV) is very useful. Because the vehicle is able to cruise without tether cable joined to support vessel, and gather data and samples automatically. The development of the power source is one of important key technologies for battery drive underwater vehicle. Usually, many underwater vehicle used rechargeable battery such that silver-zinc battery for power source. However the case of cruising type AUV, it needs many electric power supplies in proportion to cruising distance. To extend cruising range, the battery must become heavier and lager. So we plan to replace Lithium-ion battery with fuel cell because of its high energy efficiency. In 2007, we started the conceptual design of a demonstration long-cruising-range autonomous underwater vehicle to cruise 3000 kilometers, getting to develop main devices including a fuel cell power system. The second generation fuel cell system must achieve the system efficiency of over 60%, downsizing compared with the first one, reducing consumption power on the auxiliaries, large endurance up to 600 hours. We had developed a second generation fuel cell system named HEML (High efficiency Multi-Less) fuel cell system which is characterized by a lack of gas recirculation blowers and humidifiers and reducing hydrogen leak (leak-less).","PeriodicalId":224246,"journal":{"name":"2013 MTS/IEEE OCEANS - Bergen","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116383339","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: 8

Simulation of internal waves in the western Bay of Bengal using MITGCM: A case study 利用MITGCM模拟孟加拉湾西部内波:个案研究

2013 MTS/IEEE OCEANS - Bergen Pub Date : 2013-06-10 DOI: 10.1109/OCEANS-BERGEN.2013.6607966

H. Pradhan, Madhu Joshi, A. Rao

引用次数: 7

Covert underwater acoustic communication using whale noise masking on DSSS signal 利用鲸鱼噪声掩蔽DSSS信号的隐蔽水声通信

2013 MTS/IEEE OCEANS - Bergen Pub Date : 2013-06-10 DOI: 10.1109/OCEANS-BERGEN.2013.6608007

Songzuo Liu, Gang Qiao, A. Ismail, Bingjie Liu, Luwei Zhang

{"title":"Covert underwater acoustic communication using whale noise masking on DSSS signal","authors":"Songzuo Liu, Gang Qiao, A. Ismail, Bingjie Liu, Luwei Zhang","doi":"10.1109/OCEANS-BERGEN.2013.6608007","DOIUrl":"https://doi.org/10.1109/OCEANS-BERGEN.2013.6608007","url":null,"abstract":"A biological mimicry method for covert underwater acoustic communication (UAC) is presented. This is useful in clandestine communication where the contents of transmission and/or location of transmitter are required to be concealed. In this scheme, direct sequence spread spectrum (DSSS) signal which carries information is masked underneath a relatively louder whale sound in time and frequency domain. Instead of reducing signal level to a minimum, the masked communication signal is allowed to be detected but it could easily be excluded in the process of recognition/classification by an adversary. This is because the received signal resembles sounds emitted by whales and the information signal is masked by the loud whale noise. The designed communication frame structure for this scheme and coherent interference cancelation method for separation of whale sound and DSSS signal is also given. A virtual time reversal mirror (VTRM) equalization method is adopted for focusing energy of DSSS signal while accurate channel estimation is realized by the high SNR whale sound using matching pursuit (MP) technique. The effectiveness of the proposed scheme has been presented by the results of simulations.","PeriodicalId":224246,"journal":{"name":"2013 MTS/IEEE OCEANS - Bergen","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121909951","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: 22

Sequential threat detection for harbor defense: An x-ray physics-based bayesian approach 港口防御的顺序威胁检测:基于x射线物理的贝叶斯方法

2013 MTS/IEEE OCEANS - Bergen Pub Date : 2013-06-10 DOI: 10.1109/OCEANS-BERGEN.2013.6607948

James V. Candy

{"title":"Sequential threat detection for harbor defense: An x-ray physics-based bayesian approach","authors":"James V. Candy","doi":"10.1109/OCEANS-BERGEN.2013.6607948","DOIUrl":"https://doi.org/10.1109/OCEANS-BERGEN.2013.6607948","url":null,"abstract":"The timely and accurate detection of threat contraband especially for ports-of-entry (e.g. harbors, bays, borders, airports) is an extremely critical problem of national security. The investigation of advanced techniques to reliably and accurately detect threats and reject non-threats is the major focus of this effort. The characterization of signal processing models based on xray transport physics is a crucial element in advanced sequential Bayesian processor designs. Incorporating the underlying statistics of x-ray interactions with materials offering a potentially unique signature of an object or item under investigation leads to a (stochastic) physics-based approach. State-space models, common in many application areas, are introduced into the x-ray radiation area. Here the resulting processor incorporating this construct is developed from a pragmatic perspective. A Gaussian application is discussed to illustrate feasibility of the overall physics-based approach. It is shown that the sequential Bayesian processor is capable of providing a reliable and accurate solution with high confidence in a timely manner for this problem based on a set of synthesized object intensity data.","PeriodicalId":224246,"journal":{"name":"2013 MTS/IEEE OCEANS - Bergen","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117115435","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

Binary visual features for ROV motion estimation ROV运动估计的二值视觉特征

2013 MTS/IEEE OCEANS - Bergen Pub Date : 2013-06-10 DOI: 10.1109/OCEANS-BERGEN.2013.6608116

F. Ferreira, G. Veruggio, M. Caccia, G. Bruzzone

引用次数: 2