OCEANS 2006 - Asia Pacific最新文献_第2页

Trajectory Optimization for Ship Collision Avoidance System Using Genetic Algorithm 基于遗传算法的船舶避碰系统轨迹优化

OCEANS 2006 - Asia Pacific Pub Date : 2006-05-16 DOI: 10.1109/OCEANSAP.2006.4393976

X. Cheng, Z.Y. Liu, X.T. Zhang

引用次数: 16

Nonlinear Analysis of Wave Energy Dissipation and Energy Transfer of Directional Breaking Waves in Deep Water 深水中定向破碎波能量耗散和能量传递的非线性分析

OCEANS 2006 - Asia Pacific Pub Date : 2006-05-16 DOI: 10.1109/OCEANSAP.2006.4393906

K. Hong, Shu-xue Liu, E. Meza, Jun Zhang

{"title":"Nonlinear Analysis of Wave Energy Dissipation and Energy Transfer of Directional Breaking Waves in Deep Water","authors":"K. Hong, Shu-xue Liu, E. Meza, Jun Zhang","doi":"10.1109/OCEANSAP.2006.4393906","DOIUrl":"https://doi.org/10.1109/OCEANSAP.2006.4393906","url":null,"abstract":"Wave energy dissipation and energy transfer among wave components during the directional wave breaking are investigated experimentally. Directional breaking waves in deep water were simulated by focusing the multi-frequency and multi-directional wave components at a designed location based on constant wave amplitude and constant wave steepness frequency spectrum. The incipient and plunging breakers with the same spectral characteristics were generated by applying the different scale factors on wave amplitude. The time series of surface wave elevation were measured around the wave focusing point using a wave gauge array to examine the variation of directional spreading function. The free wave components of a directional wave train are separated from bound wave components by nonlinear decomposition based on directional hybrid wave model accurate up to second order. The local free wave components derived from nonlinear decomposition still include directional dispersion effect. A spatial variation of free wave packet due to directional dispersion is estimated by comparing incipient breaking wave packets at corresponding locations. When the bound wave components and directional dispersion effect are removed from the plunging breaking wave train, a variation of the directional wave spectrum of resultant free wave components before and after the wave breaking is solely responsible to wave energy dissipation and transfer between free wave components. By comparing free wave components of a plunging breaking wave packet before and after the wave breaking, the characteristics of energy dissipation and energy transfer caused by wave breaking are investigated and their dependences on frequency are analyzed. The breaking in deep water significantly dissipates wave energy in the upper region of peak-frequency band while enhances wave energy slightly in the low-frequency band by energy transfer.","PeriodicalId":268341,"journal":{"name":"OCEANS 2006 - Asia Pacific","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117338883","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

A new GapFiller system using front-scan sonar technology coupled with SHADOWS 一种使用前置扫描声纳技术与SHADOWS相结合的新型GapFiller系统

OCEANS 2006 - Asia Pacific Pub Date : 2006-05-01 DOI: 10.1109/OCEANSAP.2006.4393860

F. Mosca

{"title":"A new GapFiller system using front-scan sonar technology coupled with SHADOWS","authors":"F. Mosca","doi":"10.1109/OCEANSAP.2006.4393860","DOIUrl":"https://doi.org/10.1109/OCEANSAP.2006.4393860","url":null,"abstract":"SHADOWS is a high-performance side-scan sonar imaging system. To fill the gap at nadir, a GapFiller is developed by IXSEA. The GFS is a GapFiller using the front-scan sonar technology. It aims to fill the unsonified area of SHADOWS, which is forty-five meters wide, to ensure a good overlap between the two systems and allow the registration of the two different images. This is made possible thanks to the inertial navigation system PHINS. This system is distinguished from other GapFiller systems using multibeam sonar, indeed the kind of images obtained is noticeably different. Instead of observing the depth and bathymetric data, the images are sonar type ones. The design of the arrays has been integrally conceived by the IXSEA team, using d33-technology and an integrated reflector architecture. Finally, without any treatment other than the beam forming, the theoretical resolution obtained on the entire gap is under 40 cm, with a total physical encumbrance under 80 cm. If a traditional coherent synthesis is not allowed by the geometry of the system, an appropriate treatment provided by using an accurate and highly performant inertial navigation system (PHINS) improve significantly the resolution of the GFS. In fact instead of a linear synthesised array, this original treatment formed a bidimensional phased-array antenna. An analytic determination of the theoretical resolution depending on the pointing direction has been performed. The results are very satisfactory and predict a significant improvement of the resolution. In fact the resolution now depends on the pointing direction and with a ten-ping synthesis the resolution at 5 meters is around 25 cm and under 15 cm at 10 meters achieving this way the nominal resolution of SHADOWS.","PeriodicalId":268341,"journal":{"name":"OCEANS 2006 - Asia Pacific","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125032677","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

Hybrid Detector for Ship Radiated Signal in Statistically Varying Underwater Noise 统计变化水下噪声中舰船辐射信号的混合检测器

OCEANS 2006 - Asia Pacific Pub Date : 2006-05-01 DOI: 10.1109/OCEANSAP.2006.4393866

A. Singh, A. Kumar, M. Agrawal, R. Bahl

引用次数: 0

Acoustic Monitoring of Echolocating Porpoises 回声定位海豚的声学监测

OCEANS 2006 - Asia Pacific Pub Date : 2006-05-01 DOI: 10.1109/OCEANSAP.2006.4393821

T. Akamatsu, Ding Wang, Ke‐Xiong Wang, Liang Songhai

引用次数: 0

A new approach for fast and high-resolution interferometric bathymetry 一种快速高分辨率干涉测深新方法

OCEANS 2006 - Asia Pacific Pub Date : 2006-05-01 DOI: 10.1109/OCEANSAP.2006.4393899

G. Llort-Pujol, C. Sintes, X. Lurtont

引用次数: 18

Development of Underwater Security Sonar System 水下安全声纳系统的研制

OCEANS 2006 - Asia Pacific Pub Date : 2006-05-01 DOI: 10.1109/OCEANSAP.2006.4393879

A. Asada, K. Kuramoto, T. Tanaka, K. Oimatsu, Y. Kawashima, M. Nanri, T. Oyagi, K. Hantani

引用次数: 15

Restoration Technology of Contaminated Sediments in Coastal Environments using Steel-making Slag in Korea 利用韩国炼钢渣修复沿海环境污染沉积物的技术

OCEANS 2006 - Asia Pacific Pub Date : 2006-05-01 DOI: 10.1109/OCEANSAP.2006.4393848

Kwang-Seok Park, Hyung-Suek Kim, Ki-Young Park

{"title":"Restoration Technology of Contaminated Sediments in Coastal Environments using Steel-making Slag in Korea","authors":"Kwang-Seok Park, Hyung-Suek Kim, Ki-Young Park","doi":"10.1109/OCEANSAP.2006.4393848","DOIUrl":"https://doi.org/10.1109/OCEANSAP.2006.4393848","url":null,"abstract":"This research was conducted to investigate the possibility of applying steel-making slag as a capping (or covering) material for the remediation of polluted sea sediments and to restore the productivity in polluted marine culturing grounds and seawater quality ultimately. Steel-making slag obtained from the Kwangyang Works of POSCO were scattered in the area of 100 M x 200 M, which is located in Go-sung Bay of southern part of Korean Peninsula. The diameter of slag less than 5~8 mm was scattered using a spreading machine until the slag layer on sea sediments reached thickness between 0.5 and 1.0 cm. From these large-scale experiments for more than 12 months, PO4-P and H2S liberations from the polluted sediment resulted to be suppressed to the extent of above 95% and 97%, respectively. Applying steel-making slag on the seawater quality was determined to be not harmful in the view of pH and leached trace metal concentrations. Furthermore, applying steel-making slag resulted in much higher survival rate of phytoplankton than that from the original area. The beneficial effects of steel-making slag were evident in the sense of elevated population of phytoplankton in middle and lower water layer on the slag covered area. The growth indexes of oyster such as shell length, height, width, and wet weight in steel slag scattering area were also higher than those from the original area. In addition, higher contents of protein and fatty acid including EPA and DHA were found in the body of oyster cultured in slag-covered area. No evidence of secondary contamination from steel-making slag was found in the body of oyster.","PeriodicalId":268341,"journal":{"name":"OCEANS 2006 - Asia Pacific","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128511309","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: 0

Target Localization By Two Passive Linear Arrays 两种无源线性阵列的目标定位

OCEANS 2006 - Asia Pacific Pub Date : 2006-05-01 DOI: 10.1109/OCEANSAP.2006.4393958

Ning Ma, C. S. Chia, Rong Yang, G. Ng

引用次数: 2

Shadows, a new synthetic aperture sonar system, by IXSEA SAS 阴影，一个新的合成孔径声纳系统，由IXSEA SAS

OCEANS 2006 - Asia Pacific Pub Date : 2006-05-01 DOI: 10.1109/OCEANSAP.2006.4393858

F. Jean

引用次数: 9