Pub Date : 2008-09-01DOI: 10.1109/OCEANS.2008.5152137
P. Schlosser, H. Eicken
The Arctic is presently undergoing rapid changes that cross the physical, biogeochemical and human domains. Understanding the causes of these changes and designing response strategies from the local to the hemispheric scale requires the implementation of an integrated, cross-disciplinary pan-Arctic observing system that is capable of capturing the evolution of the ongoing changes in near real-time. Due to the large spatial extent and the many variables that have to be covered by such an observing system it requires an international effort. This paper presents the status of the U.S. interagency effort to implement a component of the emerging Arctic Observing System that has been established during the past few years, in large part during the International Polar Year, in support of the Study of Environmental Arctic Change (SEARCH).
{"title":"The U.S. Arctic observing network (AON): A component of the study of Environmental Arctic Change","authors":"P. Schlosser, H. Eicken","doi":"10.1109/OCEANS.2008.5152137","DOIUrl":"https://doi.org/10.1109/OCEANS.2008.5152137","url":null,"abstract":"The Arctic is presently undergoing rapid changes that cross the physical, biogeochemical and human domains. Understanding the causes of these changes and designing response strategies from the local to the hemispheric scale requires the implementation of an integrated, cross-disciplinary pan-Arctic observing system that is capable of capturing the evolution of the ongoing changes in near real-time. Due to the large spatial extent and the many variables that have to be covered by such an observing system it requires an international effort. This paper presents the status of the U.S. interagency effort to implement a component of the emerging Arctic Observing System that has been established during the past few years, in large part during the International Polar Year, in support of the Study of Environmental Arctic Change (SEARCH).","PeriodicalId":113677,"journal":{"name":"OCEANS 2008","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123579829","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}
Pub Date : 2008-09-01DOI: 10.1109/OCEANS.2008.5151966
P. Courmontagne, G. Fages, P. Beaujean
Underwater acoustic communications in shallow water are essential for the transmission of data between AUVs and remote sensors. Shallow water communications remain a challenge due to factors like multipath propagation, time variations of the channel, small available bandwidth and strong signal attenuation. To adress this problem, we propose a new chirp FSK scheme that enhances the data rate and is robust to noise. Using Gabor chirp spectra linear combination to describe the transmitted symbol and overlapping bandwidth, we obtain simulated transmissions at a peak data rate of 7 kbits/sec. Furthermore, simulation results reveal a very low bit error rate even with a low signal-to-noise ratio indicating that long ranges could be reached.
{"title":"A chirp FSK improvement for communications in shallow water using bandwidth overlapping","authors":"P. Courmontagne, G. Fages, P. Beaujean","doi":"10.1109/OCEANS.2008.5151966","DOIUrl":"https://doi.org/10.1109/OCEANS.2008.5151966","url":null,"abstract":"Underwater acoustic communications in shallow water are essential for the transmission of data between AUVs and remote sensors. Shallow water communications remain a challenge due to factors like multipath propagation, time variations of the channel, small available bandwidth and strong signal attenuation. To adress this problem, we propose a new chirp FSK scheme that enhances the data rate and is robust to noise. Using Gabor chirp spectra linear combination to describe the transmitted symbol and overlapping bandwidth, we obtain simulated transmissions at a peak data rate of 7 kbits/sec. Furthermore, simulation results reveal a very low bit error rate even with a low signal-to-noise ratio indicating that long ranges could be reached.","PeriodicalId":113677,"journal":{"name":"OCEANS 2008","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123777217","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}
Pub Date : 2008-09-01DOI: 10.1109/OCEANS.2008.5151878
J. Schubel, K. A. Schubel
Public awareness and understanding of ocean issues is key to generating the political will to address these problems. The case for the importance of an ocean literate public in moving from issues to solutions has been made in a series of reports by national commissions starting with the Stratton Commission in 1969. Since 2004 there has been a renewed interest in promoting ocean literacy both at the K-12 grade levels and of the general public. Aquariums and other informal science institutions are seen as key players. The Aquarium of the Pacific has focused on public ocean literacy and during its 10th anniversary year has embarked upon a major initiative to bring major ocean issues to the public in new and novel ways, to evaluate the efficacy of these modalities, and through a national conference in May 2009 to bring scientific experts together with experts in exhibit design, film-making, environmental journalism, and story-telling to develop a portfolio of materials designed for different modalities of delivery for each of the major ocean issues that can be used widely to engage, educate and empower the public in moving from ocean issues to solutions. We invite participation by the MTS and its members.
{"title":"From ocean issues to solutions: The role of public ocean literacy","authors":"J. Schubel, K. A. Schubel","doi":"10.1109/OCEANS.2008.5151878","DOIUrl":"https://doi.org/10.1109/OCEANS.2008.5151878","url":null,"abstract":"Public awareness and understanding of ocean issues is key to generating the political will to address these problems. The case for the importance of an ocean literate public in moving from issues to solutions has been made in a series of reports by national commissions starting with the Stratton Commission in 1969. Since 2004 there has been a renewed interest in promoting ocean literacy both at the K-12 grade levels and of the general public. Aquariums and other informal science institutions are seen as key players. The Aquarium of the Pacific has focused on public ocean literacy and during its 10th anniversary year has embarked upon a major initiative to bring major ocean issues to the public in new and novel ways, to evaluate the efficacy of these modalities, and through a national conference in May 2009 to bring scientific experts together with experts in exhibit design, film-making, environmental journalism, and story-telling to develop a portfolio of materials designed for different modalities of delivery for each of the major ocean issues that can be used widely to engage, educate and empower the public in moving from ocean issues to solutions. We invite participation by the MTS and its members.","PeriodicalId":113677,"journal":{"name":"OCEANS 2008","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116013614","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}
Pub Date : 2008-09-01DOI: 10.1109/OCEANS.2008.5151980
N. Santos, A. Matos, N. Cruz
This work addresses the implementation of the navigation, guidance and control of autonomous underwater vehicles on mobile acoustic networks. After a theoretical discussion of the algorithms required for such operation, we present results from simulation and real experiments that validate the proposed solutions.
{"title":"Navigation of an autonomous underwater vehicle in a mobile network","authors":"N. Santos, A. Matos, N. Cruz","doi":"10.1109/OCEANS.2008.5151980","DOIUrl":"https://doi.org/10.1109/OCEANS.2008.5151980","url":null,"abstract":"This work addresses the implementation of the navigation, guidance and control of autonomous underwater vehicles on mobile acoustic networks. After a theoretical discussion of the algorithms required for such operation, we present results from simulation and real experiments that validate the proposed solutions.","PeriodicalId":113677,"journal":{"name":"OCEANS 2008","volume":"278 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116561226","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}
Pub Date : 2008-09-01DOI: 10.1109/OCEANS.2008.5151995
S. Krupinski, F. Maurelli, G. Grenon, Y. Pétillot
This paper presents a localization strategy for an AUV which autonomously docks on intervention panels. A brief review of past research and working solutions of docking motivates the proposed choice of the strategy. It combines a ranging sonar localization technique featuring a modified particle filter at large distance and a visual model-based pose estimation using on-board camera at close distance to the docking panel. The particle filter solution is enhanced for effective exploration of the vehicle states without increasing the computational demand. It operates in an environment with a known map and has a real-time performance. The pose recognition algorithm derives from POSIT and is optimized for robustness. The visual docking utilizes a set of point-light markers which guarantees good accuracy at a large range of angles. Mentioned strategies are proven in a number of simulations as well as practical tests.
{"title":"Investigation of autonomous docking strategies for robotic operation on intervention panels","authors":"S. Krupinski, F. Maurelli, G. Grenon, Y. Pétillot","doi":"10.1109/OCEANS.2008.5151995","DOIUrl":"https://doi.org/10.1109/OCEANS.2008.5151995","url":null,"abstract":"This paper presents a localization strategy for an AUV which autonomously docks on intervention panels. A brief review of past research and working solutions of docking motivates the proposed choice of the strategy. It combines a ranging sonar localization technique featuring a modified particle filter at large distance and a visual model-based pose estimation using on-board camera at close distance to the docking panel. The particle filter solution is enhanced for effective exploration of the vehicle states without increasing the computational demand. It operates in an environment with a known map and has a real-time performance. The pose recognition algorithm derives from POSIT and is optimized for robustness. The visual docking utilizes a set of point-light markers which guarantees good accuracy at a large range of angles. Mentioned strategies are proven in a number of simulations as well as practical tests.","PeriodicalId":113677,"journal":{"name":"OCEANS 2008","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122342800","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}
Pub Date : 2008-09-01DOI: 10.1109/OCEANS.2008.5152073
R. Wiegert, K. Lee, J. Oeschger
There is a pressing need for a practical and effective magnetic sensing technology that can be deployed onboard highly maneuverable sensing platforms and used for real-time, point-by-point detection, localization and classification (DLC) of magnetic targets such as ferrous unexploded ordnance (UXO) e.g., bombs, buried mines and artillery shells. Therefore the Strategic Environmental Research and Development Program (SERDP) has supported research and development, by Naval Surface Warfare Center Panama City Division (NSWC PCD), of a novel man-portable Magnetic Scalar Triangulation and Ranging (i.e., "STAR" and/or "MagSTAR") technology for DLC of UXO. The STAR concept uses scalar magnitudes of magnetic gradient tensors to triangulate the locations of magnetic targets. The magnitudes are analogous to central potential-type functions and they can provide true point-by-point DLC capabilities for sensing platforms in general, unconstrained motion. A prototype man-portable STAR Gradiometer was designed and constructed at NSWC PCD to provide a completely portable and user-friendly technology for real-time DLC of magnetic UXO. The prototype STAR Sensor comprises: a) A cubic array of eight fluxgate magnetometers, b) A 24-channel data acquisition/signal processing system. In field tests the man-portable sensor has demonstrated very robust, motion-noise-resistant DLC performance against isolated dipole type targets . This paper describes work that is ongoing to enhance the performance of the MagSTAR Technology. In particular, two improved algorithms for solving the "STAR Equations" are described: 1) A directional derivative (DD) method based on the fact that the gradient of a central potential field is a vector that points toward the target/source of the locally strongest gradient. 2) A least-squares-fit (LSF) method that iteratively calculates a magnetic target's location and magnetic signature. The DD method is being developed for better discrimination between multiple targets but for isolated targets it is more susceptible to sensor noise than the LSF method. The initial LSF method applies primarily to DLC of isolated dipole targets. Thus, the methods preferably should be used concurrently as complementary DLC modalities in environments that may be magnetically complex. These improved methods should help facilitate the transition of the STAR Technology from man-portable applications to applications using highly maneuverable autonomous sensing platforms for real-time "on the fly" DLC of magnetic targets such as UXO and buried mines.
{"title":"Improved magnetic STAR methods for real-time, point-by-point localization of unexploded ordnance and buried mines","authors":"R. Wiegert, K. Lee, J. Oeschger","doi":"10.1109/OCEANS.2008.5152073","DOIUrl":"https://doi.org/10.1109/OCEANS.2008.5152073","url":null,"abstract":"There is a pressing need for a practical and effective magnetic sensing technology that can be deployed onboard highly maneuverable sensing platforms and used for real-time, point-by-point detection, localization and classification (DLC) of magnetic targets such as ferrous unexploded ordnance (UXO) e.g., bombs, buried mines and artillery shells. Therefore the Strategic Environmental Research and Development Program (SERDP) has supported research and development, by Naval Surface Warfare Center Panama City Division (NSWC PCD), of a novel man-portable Magnetic Scalar Triangulation and Ranging (i.e., \"STAR\" and/or \"MagSTAR\") technology for DLC of UXO. The STAR concept uses scalar magnitudes of magnetic gradient tensors to triangulate the locations of magnetic targets. The magnitudes are analogous to central potential-type functions and they can provide true point-by-point DLC capabilities for sensing platforms in general, unconstrained motion. A prototype man-portable STAR Gradiometer was designed and constructed at NSWC PCD to provide a completely portable and user-friendly technology for real-time DLC of magnetic UXO. The prototype STAR Sensor comprises: a) A cubic array of eight fluxgate magnetometers, b) A 24-channel data acquisition/signal processing system. In field tests the man-portable sensor has demonstrated very robust, motion-noise-resistant DLC performance against isolated dipole type targets . This paper describes work that is ongoing to enhance the performance of the MagSTAR Technology. In particular, two improved algorithms for solving the \"STAR Equations\" are described: 1) A directional derivative (DD) method based on the fact that the gradient of a central potential field is a vector that points toward the target/source of the locally strongest gradient. 2) A least-squares-fit (LSF) method that iteratively calculates a magnetic target's location and magnetic signature. The DD method is being developed for better discrimination between multiple targets but for isolated targets it is more susceptible to sensor noise than the LSF method. The initial LSF method applies primarily to DLC of isolated dipole targets. Thus, the methods preferably should be used concurrently as complementary DLC modalities in environments that may be magnetically complex. These improved methods should help facilitate the transition of the STAR Technology from man-portable applications to applications using highly maneuverable autonomous sensing platforms for real-time \"on the fly\" DLC of magnetic targets such as UXO and buried mines.","PeriodicalId":113677,"journal":{"name":"OCEANS 2008","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122672903","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}
Pub Date : 2008-09-01DOI: 10.1109/OCEANS.2008.5152121
M.A. Rahman, T. Oomori
Understanding the functional properties of endoskeletal proteins in the calcification processes of soft corals is essential. However, separation of proteins from soft corals is difficult due to contamination by soft tissues and the high sensitivity of soft tissues to handling. We have resolved this problem and established a simple and effective method-electroelution treatment-for purifying proteins from soft corals. Here we applied this newly developed technique to successfully identify four proteins (MPL-1, MPL-2, MPL-3 and MPL-4) from the endoskeletal sclerites of soft coral, Lobophytum crassum as a model. Following this method, we identified a carbonic anhydrase (CA) domain in a soft coral; CA is a key enzyme in living organisms. We found that two CA proteins, which were purified by electroelution, could control the morphology of the CaCO3 crystals, and one of these is potentially involved in the process of biocalcification. We report here a single protein (MPL-2), which has both calcium-binding and CA activities and is responsible for CaCO3 nucleation and crystal growth. The sequence of protein MPL-2 was subjected to bioinformatics analysis involving identification of similarities to other animals' protein. The function of proteins during bio-calcification was also studied by simulating the nucleation and growth of calcium carbonates in vitro. After precipitation of CaCO3 in the experimental design, the obtained crystals were characterized by X-Ray Diffraction (XRD). These findings suggest that the proteins, which were purified from the calcified sclerites, can control the morphology of CaCO3 crystals and are potentially involved in the process of bio-calcification.
{"title":"Identification and function of new proteins in calcified endoskeleton: A new insight in the calcification mechanism of soft corals","authors":"M.A. Rahman, T. Oomori","doi":"10.1109/OCEANS.2008.5152121","DOIUrl":"https://doi.org/10.1109/OCEANS.2008.5152121","url":null,"abstract":"Understanding the functional properties of endoskeletal proteins in the calcification processes of soft corals is essential. However, separation of proteins from soft corals is difficult due to contamination by soft tissues and the high sensitivity of soft tissues to handling. We have resolved this problem and established a simple and effective method-electroelution treatment-for purifying proteins from soft corals. Here we applied this newly developed technique to successfully identify four proteins (MPL-1, MPL-2, MPL-3 and MPL-4) from the endoskeletal sclerites of soft coral, Lobophytum crassum as a model. Following this method, we identified a carbonic anhydrase (CA) domain in a soft coral; CA is a key enzyme in living organisms. We found that two CA proteins, which were purified by electroelution, could control the morphology of the CaCO3 crystals, and one of these is potentially involved in the process of biocalcification. We report here a single protein (MPL-2), which has both calcium-binding and CA activities and is responsible for CaCO3 nucleation and crystal growth. The sequence of protein MPL-2 was subjected to bioinformatics analysis involving identification of similarities to other animals' protein. The function of proteins during bio-calcification was also studied by simulating the nucleation and growth of calcium carbonates in vitro. After precipitation of CaCO3 in the experimental design, the obtained crystals were characterized by X-Ray Diffraction (XRD). These findings suggest that the proteins, which were purified from the calcified sclerites, can control the morphology of CaCO3 crystals and are potentially involved in the process of bio-calcification.","PeriodicalId":113677,"journal":{"name":"OCEANS 2008","volume":"27 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122749646","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}
Pub Date : 2008-09-01DOI: 10.1109/OCEANS.2008.5151858
Bing Zheng, Jialin Hou, Guoyu Wang
While doing the underwater scanning, navigating, and other tasking, the acquisition of large scale 3D information of the environmental terrain and objects is very important for the UV's navigation safety and task conduction. In this paper, we propose a new approach of underwater target detection using discontinuing digital laser scanning grid. It is shown that the proposed approach can not only suppress the scattering background noise generated by the suspend particles in the water, but also be able to detect the relative depth information of the multiple underwater targets, i.e. the proposed approach can acquire underwater clear image via suppressing laser background scattering noise and display the multiple targets within the visual field simultaneously.
{"title":"An approach of 3D information real-time display for detection of underwater target based on laser digital scanning grid","authors":"Bing Zheng, Jialin Hou, Guoyu Wang","doi":"10.1109/OCEANS.2008.5151858","DOIUrl":"https://doi.org/10.1109/OCEANS.2008.5151858","url":null,"abstract":"While doing the underwater scanning, navigating, and other tasking, the acquisition of large scale 3D information of the environmental terrain and objects is very important for the UV's navigation safety and task conduction. In this paper, we propose a new approach of underwater target detection using discontinuing digital laser scanning grid. It is shown that the proposed approach can not only suppress the scattering background noise generated by the suspend particles in the water, but also be able to detect the relative depth information of the multiple underwater targets, i.e. the proposed approach can acquire underwater clear image via suppressing laser background scattering noise and display the multiple targets within the visual field simultaneously.","PeriodicalId":113677,"journal":{"name":"OCEANS 2008","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122472221","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}
Pub Date : 2008-09-01DOI: 10.1109/OCEANS.2008.5151914
B. Abdalla, P. Jukes, A. Eltaher, B. Duron
The world demand of oil and gas is growing at an ever increasing rate, and as a result, there is a demand to explore new areas for more petroleum production. The arctic region is one of the remaining unexplored areas where such exploration still can be done. According to the US Geological Survey estimates, the arctic region, mostly offshore, holds as much as 25% of the world's untapped reserve of hydrocarbons where much of the reserve is lying under seasonal or year-round sea ice. The exploitation of these remaining reserves, however, will depend upon meeting the technical challenges of design, construction, and operation of offshore installations. Despite some experience with Arctic oil and gas exploration and production during the last three decades, technology gaps still exist and will have to be bridged in order to enable optimized developments to proceed. In this paper, technical design difficulties particular to arctic pipelines are presented; these include ice gouging, permafrost thaw settlement, strudel scour, and upheaval buckling. An emphasis is then placed on advanced finite element techniques that can be used to address these issues, with an example of such techniques illustrating their ability to model highly complex and nonlinear phenomena.
{"title":"The technical challenges of designing oil and gas pipelines in the arctic","authors":"B. Abdalla, P. Jukes, A. Eltaher, B. Duron","doi":"10.1109/OCEANS.2008.5151914","DOIUrl":"https://doi.org/10.1109/OCEANS.2008.5151914","url":null,"abstract":"The world demand of oil and gas is growing at an ever increasing rate, and as a result, there is a demand to explore new areas for more petroleum production. The arctic region is one of the remaining unexplored areas where such exploration still can be done. According to the US Geological Survey estimates, the arctic region, mostly offshore, holds as much as 25% of the world's untapped reserve of hydrocarbons where much of the reserve is lying under seasonal or year-round sea ice. The exploitation of these remaining reserves, however, will depend upon meeting the technical challenges of design, construction, and operation of offshore installations. Despite some experience with Arctic oil and gas exploration and production during the last three decades, technology gaps still exist and will have to be bridged in order to enable optimized developments to proceed. In this paper, technical design difficulties particular to arctic pipelines are presented; these include ice gouging, permafrost thaw settlement, strudel scour, and upheaval buckling. An emphasis is then placed on advanced finite element techniques that can be used to address these issues, with an example of such techniques illustrating their ability to model highly complex and nonlinear phenomena.","PeriodicalId":113677,"journal":{"name":"OCEANS 2008","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122889523","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}
Pub Date : 2008-09-01DOI: 10.1109/OCEANS.2008.5152028
Chris Murphy, Hanumant Singh
Recent under-ice Arctic AUV expeditions have shown that polar operations require careful coordination between subsea vehicles and surface ships during vehicle recovery. In addition, the complexity of AUV launches and recoveries encourages telemetering AUV science data to allow scientists greater decision-making power while an AUV dive is underway. Reliable underwater communication, however, imposes strict bandwidth limitations. This paper presents a method for summarizing scalar vehicle science and state telemetry over low-bandwidth acoustic links, along with a topside display for presenting the data to surface observers.
{"title":"Human-guided autonomy for acoustically tethered underwater vehicles","authors":"Chris Murphy, Hanumant Singh","doi":"10.1109/OCEANS.2008.5152028","DOIUrl":"https://doi.org/10.1109/OCEANS.2008.5152028","url":null,"abstract":"Recent under-ice Arctic AUV expeditions have shown that polar operations require careful coordination between subsea vehicles and surface ships during vehicle recovery. In addition, the complexity of AUV launches and recoveries encourages telemetering AUV science data to allow scientists greater decision-making power while an AUV dive is underway. Reliable underwater communication, however, imposes strict bandwidth limitations. This paper presents a method for summarizing scalar vehicle science and state telemetry over low-bandwidth acoustic links, along with a topside display for presenting the data to surface observers.","PeriodicalId":113677,"journal":{"name":"OCEANS 2008","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122914406","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}
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