Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600)最新文献_第2页

Elimination of environmental impact loads from processed efflux 消除经处理的外排物对环境的影响负荷

Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600) Pub Date : 2004-11-09 DOI: 10.1109/OCEANS.2004.1405516

R. Hosoda, S. Murota, D. Hamamiya, M. Yao, H. Fujinami, N. Hata

{"title":"Elimination of environmental impact loads from processed efflux","authors":"R. Hosoda, S. Murota, D. Hamamiya, M. Yao, H. Fujinami, N. Hata","doi":"10.1109/OCEANS.2004.1405516","DOIUrl":"https://doi.org/10.1109/OCEANS.2004.1405516","url":null,"abstract":"The degradation of seawater quality in enclosed coastal sea area such as organic pollution and eutrophication is mainly caused by processed efflux from sewerage facilities. It has not been well understood that the processed efflux still dissolves high concentrations of nitrogen compounds and phosphates. Disposal capacity and supply of electric energy in sewerage facilities are necessary to be improved to remove such kind of environmental impact loads from sewage and drainage. To solve the problem without using big facilities and big amount of electricity, we have to study and consider the possibility of the natural purifying capacity of marine ecosystem in the coastal sea area. The red tides are phenomena of excess amount of phytoplankton growth in the eutrophic seawater. It means that some kinds of algae or phytoplankton can be used for purifying sewage and drainage which contains nitrogen compounds and phosphates, namely for assimilating nutrient loads. The authors proposed the \"Eco-Platform\" in the previous paper, and one of the key functions of the Eco-Platform is algae proliferation system. In the present paper, they show that the sea lettuce (Ulvales) gives a good solution to the problem. It grows very rapidly with assimilating nutrient loads in seawater under optimally controlled light and water temperature conditions. They also show that the energy-recycle in a broad sense can be achieved by processing the proliferated sea lettuce in the subcritical-hot-water decomposition system and subsequent methane fermentation system.","PeriodicalId":390971,"journal":{"name":"Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125908418","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

Consciousness survey of waterfront residents in terms of comfort level of marine environment 滨水区居民对海洋环境舒适度的意识调查

Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600) Pub Date : 2004-11-09 DOI: 10.1109/OCEANS.2004.1406389

M. Katayama

{"title":"Consciousness survey of waterfront residents in terms of comfort level of marine environment","authors":"M. Katayama","doi":"10.1109/OCEANS.2004.1406389","DOIUrl":"https://doi.org/10.1109/OCEANS.2004.1406389","url":null,"abstract":"Abshnd-Waterfronts are increasingly being used for general public activities and residence. As a result, various specific environmental problems have emerged regarding activity, livability and comfort level in these areas. Along the coastline, for example, sounds of waves or wind are pleasant in some cases, but unpleasant in other cases. In order to create an attractive urban space in the development of the wnterfrout, it is essential to perform a basic planning in consideration of the comfort level of the marine environment. In this regard, in the coastal zone (waterfronts) of Kitakyushu City and vicinity, Japan, a questionnaire SUN^ in terms of the comfort level of marine environment was conducted, and analyzed to obtain the consciousness of the residents. The target areas of the questionnaire survey were fishery and residential quarters along the coastline. These areas are home to relatively large numbers of people involved in fishery and company work. These coastal nreas were divided into three different types : the artificial coast (vertical embankment plus wave dissipating blocks), natural sandy coast and artificial coast (vertical embankment). As survey method, the procedure so called visiting-leaving and questionnaire~ollecting was applied. The results of the analysis of the questionnaire survey of the residents consciousness on the marine environment showed that the natural environment was preferable to the artificial environment for the waterfront residents.","PeriodicalId":390971,"journal":{"name":"Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125248465","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

A discontinuous Galerkin finite element shallow water model in simulating tidal flows 模拟潮汐流的不连续Galerkin有限元浅水模型

Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600) Pub Date : 2004-11-09 DOI: 10.1109/OCEANS.2004.1406348

Zhixing Yu, Y. Kyozuka

引用次数: 2

Fusion of multiple side-scan sonar views 融合多个侧扫声纳视图

Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600) Pub Date : 2004-11-09 DOI: 10.1109/OCEANS.2004.1406456

E. Coiras, I. T. Ruiz, Yvan Petillot, David M. Lane

引用次数: 8

Sea bottom and surface reverberations in scanning sonar 扫描声纳中的海底和海面混响

Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600) Pub Date : 2004-11-09 DOI: 10.1109/OCEANS.2004.1402952

M. Furusawa, Yong Tang

引用次数: 1

Implementation of multi-vessel tracking algorithm using multiple marine radar systems 利用多雷达系统实现多船跟踪算法

Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600) Pub Date : 2004-11-09 DOI: 10.1109/OCEANS.2004.1406498

S. Byun, Han-jin Lee, H. Yoon, D. Gong, Chang-Min Lee, C. Kang

{"title":"Implementation of multi-vessel tracking algorithm using multiple marine radar systems","authors":"S. Byun, Han-jin Lee, H. Yoon, D. Gong, Chang-Min Lee, C. Kang","doi":"10.1109/OCEANS.2004.1406498","DOIUrl":"https://doi.org/10.1109/OCEANS.2004.1406498","url":null,"abstract":"To prevent marine casualties, marine radars are widely used for tracking vessels near coast and, in general, multiple marine radars are applied to cover wide coastal area. Therefore their cooperative operation is very important for effective vessel traffic control. This work introduces implementation of a multivessel, multiradar tracking algorithm which can be used for such purpose. The implemented algorithm is based on the sensor-level tracking with centralized track file architecture which maintains a sensor-level (local) track file at each local radar site and integrate them into one central-level (global) track file using cross-correlation of the sensor-level tracks. The sensor-level tracking at each local radar site employs the conventional global nearest neighbor (GNN) approach which uses the auction algorithm for data association. The sensor-level tracks formed at each radar site are transmitted to data fusion center and combined by a track-to-track fusion algorithm to give central-level tracks. The resulting central-level tracks are also correlated against time to give a continuous track file for each target vessel even though it goes through the border of different radar's scan area. To validate the algorithm, a simulation was fulfilled and it showed that it operated properly as intended.","PeriodicalId":390971,"journal":{"name":"Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600)","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124657193","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

Study on the shipping route of the Ishikari inland waterway 石kari内河航道航路研究

Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600) Pub Date : 2004-11-09 DOI: 10.1109/OCEANS.2004.1406505

K. Takahashi, K. Goto, J. Sumie, T. Terashima, N. Otsuka, T. Shibata, N. Usami

引用次数: 0

Frequency invariant beamforming in very short arrays 极短阵列中的频率不变波束形成

Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600) Pub Date : 2004-11-09 DOI: 10.1109/OCEANS.2004.1405493

A. Trucco, S. Repetto

{"title":"Frequency invariant beamforming in very short arrays","authors":"A. Trucco, S. Repetto","doi":"10.1109/OCEANS.2004.1405493","DOIUrl":"https://doi.org/10.1109/OCEANS.2004.1405493","url":null,"abstract":"Frequency invariant beam patterns are often required in systems using an array of sensors to process broadband signals. Although several methods have been proposed to design a broadband beamformer (typically realized by an FIR filter for each sensor) with a frequency invariant beam pattern, till now the case in which the spatial aperture is shorter than the involved wavelengths has not been addressed. In such a case, the use of a superdirective beam pattern is essential to attain an efficient system. In this paper, a novel method to design a broadband beamforming that produces a frequency invariant beam pattern for a data-independent superdirective array is proposed and compared with other potential approaches. The method generates a far-field beam pattern that reproduces the desired profile over a very wide frequency band, also if the array is shorter than the wavelength. Two steps are necessary: (1) the generation of many apodizing windows at different frequency values by a stochastic method; (2) the synthesis of the FIR filters with the Parks-McClellan technique. At the end of the design chain, the very simple implementation and the robustness to array imperfections of the attained broadband beamformer increases the applicability of the system, for instance, in underwater communications for small vehicles.","PeriodicalId":390971,"journal":{"name":"Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129453844","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

Influence of depth-dependent sediment properties on the pressure reflection coefficient at normal incidence using the Biot-Stoll Model 基于Biot-Stoll模型的深度依赖泥沙特性对正入射压力反射系数的影响

Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600) Pub Date : 2004-11-09 DOI: 10.1109/OCEANS.2004.1406470

M. Joussein, P. Beaujean, S. Schock

{"title":"Influence of depth-dependent sediment properties on the pressure reflection coefficient at normal incidence using the Biot-Stoll Model","authors":"M. Joussein, P. Beaujean, S. Schock","doi":"10.1109/OCEANS.2004.1406470","DOIUrl":"https://doi.org/10.1109/OCEANS.2004.1406470","url":null,"abstract":"The impact of depth-dependent geophysical parameters on the reflection coefficient is studied using the Biot-Stoll theory in porous marine sediments. The seabed is modeled as a sediment layer with depth-dependent properties on top of a homogeneous half-space, as originally proposed by Stern. Reflection coefficient, phase velocity and attenuation coefficient for the slow, fast and shear waves are computed as a function of frequency and layer thickness. The model is tested assuming normal incidence of plane acoustic waves to the sea floor, which simulates the reflection coefficient measured from classic sub-bottom profilers. Results are determined by the evaluation of boundary conditions at the water-sediment layer interface and the sediment layer-half-space interface. The wave equation is solved as a function of frequency and layer thickness using the Runge-Kutta method. All depth-dependent parameters are linked to the porosity using equations provided by Berryman, Ogushwitz, Hovem and Ingram. Mean grain diameter and porosity are obtained from the Geoclutter experiment. The porosity varies with depth, while the mean grain diameter remains constant. Results are obtained for different types of sediment, from medium size sands to silty clay, and different porosity profiles. Depending on the sediment core, the porosity varied between 32% and 70%, indicating a high water content in every sample and suspension near the top of the layer. The maximum thickness of the layer is limited to 0.5 meters. The frequency range is 100 Hz to 5 kHz. If the porosity is lower than 45%, results show that the reflection coefficient vs. frequency may be very similar for two sediments of very different mean grain diameter but of similar porosity profile. However, a large difference in porosity at any depth between two samples leads to very different reflection coefficient spectra. This work is sponsored by the Office of Naval Research, Code # ONR321CG, Dr. Tom Drake","PeriodicalId":390971,"journal":{"name":"Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129669419","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

Image quality assessment in time/frequency surfaces 时间/频率曲面的图像质量评估

Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600) Pub Date : 2004-11-09 DOI: 10.1109/OCEANS.2004.1405504

M. Levonen, L. Persson, S. McLaughlin

{"title":"Image quality assessment in time/frequency surfaces","authors":"M. Levonen, L. Persson, S. McLaughlin","doi":"10.1109/OCEANS.2004.1405504","DOIUrl":"https://doi.org/10.1109/OCEANS.2004.1405504","url":null,"abstract":"In this paper time-frequency analysis has been done using the traditional short time Fourier transform (STFT), also known as a spectrogram, and the short time fractional Fourier transform (STFrFT). The STFrFT is a generalisation of the traditional STFT. Performance comparisons are made between the two different transforms and it is shown that matching the transform to the nature of the data improves the quality of the time-frequency images. Two data sets are analysed, both sets were recorded in the Baltic Sea. The first set includes high bandwidth (60 kHz) high chirp rate, short duration signals (1 ms duration). The second set has lower bandwidth and lower chirp rate. The analysis of these two sets are used to illustrate the strengths and weaknesses of the transforms. In the second section of this paper a number of different metrics for image quality assessment are tried out on the time/frequency images produced with the aforementioned transform techniques. The results show that the FrFT has several advantages over the traditional short time Fourier transform, as it makes use of the knowledge of the transmitted wave form, when the data indeed has the desired properties. When the chirp rate decreases, the FrFT becomes the traditional FT and does not provide any enhancement to the time/frequency image. The implementation of image quality measures show that depending on what the characteristics of the features in the image are, different image quality measures are required to ensure that the right conclusions are drawn about image quality. This also points out the need to establish what one means with image quality.","PeriodicalId":390971,"journal":{"name":"Oceans '04 MTS/IEEE Techno-Ocean '04 (IEEE Cat. No.04CH37600)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130315968","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: 3