OCEANS 2006 - Asia Pacific最新文献

{"title":"Fused Classification of Surface Ships Based on Hydroacoustic and Electromagnetic Signatures","authors":"R. Lennartsson, E. Dalberg, M. Levonen, D. Lindgren, L. Persson","doi":"10.1109/OCEANSAP.2006.4393910","DOIUrl":"https://doi.org/10.1109/OCEANSAP.2006.4393910","url":null,"abstract":"This paper reports a classification study using data-fusion on real-world, underwater signatures from surface ships. In this study we design and evaluate classifiers optimized to discriminate between small and big ships based on features extracted from extremely low frequency electric (ELFE) and hydroacoustic signatures. Classification is performed separately on each signature, and finally the individual decisions are fused into a common decision. The data set analysed here was recorded at a sea trial conducted in the Baltic Sea off the east coast of Sweden. The data set contains 23 passages of surface ships of various size, divided into small (up to 21484 tons) and big (above 21484 tons)ships based on their displacement.","PeriodicalId":268341,"journal":{"name":"OCEANS 2006 - Asia Pacific","volume":"114 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":"132057850","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}

{"title":"Nitrous Oxide Emissions from Marine Diesel Engine Sources","authors":"A. Sudrajad, O. Nishida, H. Fujita, W. Harano","doi":"10.1109/OCEANSAP.2006.4393822","DOIUrl":"https://doi.org/10.1109/OCEANSAP.2006.4393822","url":null,"abstract":"The aim of this paper is to study the effect of ship operation on formation of N2O emissions and the influence of temperature changing in the exhaust pipe diesel engine. The data were taken from training ship Fukae Maru during the voyage project in September 2004 and the diesel engine experiment in the laboratory. Data from the Fukae Maru training ship were carried out at different operating conditions. Two sampling points, in the engine room and funnel were set up in the experiment. The N2O analyzer model 46C was used to measure exhaust emissions. A direct-injection diesel engine with naturally aspirated (model NF-19SK YANMAR) single cylinder was employed to test the emission and engine performance. The experiment data shows that in the 15 degree PPA, the nitrous oxide emissions higher than others condition.","PeriodicalId":268341,"journal":{"name":"OCEANS 2006 - Asia Pacific","volume":"58 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":"114355339","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}

{"title":"Navigation and Control System of a Deep-sea Unmanned Underwater Vehicle 'HEMIRE'","authors":"Pan-Mook Lee, B. Jun, Ji-Hong Li, Hyun-Taek Choi, Kihun Kim, Sea-moon Kim, Chong-moo Lee, Sanghyuck Han, B. Gu, Sang-Ryul Lee, H. Chung, H.S. Choi","doi":"10.1109/OCEANSAP.2006.4393939","DOIUrl":"https://doi.org/10.1109/OCEANSAP.2006.4393939","url":null,"abstract":"This paper presents a hybrid underwater navigation and control system for positioning, guidance and control of a deep-sea unmanned underwater vehicle (UUV), HEMIRE. For precise navigation of the UUV, the hybrid navigation system is designed based on strap-down IMU (inertial measurement unit) accompanying with USBL (ultra-short base line), DVL (Doppler velocity log), range sonar, depth and heading sensors. Initial localization and position reference of the UUV are performed with the USBL when the vehicles are in stationary condition. This paper also presents the characteristics of the UUV and the system constitution of the surface control unit. HEMIRE is equipped with two hydraulic manipulators, ORION, which are remotely controlled at the surface vessel via fiber optic communication. An operator can control the manipulators with a workspace-controlled master arm as well as a parallel-type master arm. This paper describes the task-oriented control of the tele-operated robotic arms mounted on HEMIRE and its application to task-oriented joint configurations.","PeriodicalId":268341,"journal":{"name":"OCEANS 2006 - Asia Pacific","volume":"5 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":"132197271","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}

{"title":"Situation Awareness System in a Maritime Port","authors":"T. Tan, F. Lim, Yenicca Kang","doi":"10.1109/OCEANSAP.2006.4393913","DOIUrl":"https://doi.org/10.1109/OCEANSAP.2006.4393913","url":null,"abstract":"The Automatic Identification System (AIS) is a transponder-based system that broadcasts the ownship's data (e.g. position, speed, course, ship identification number, and dimensions) on a regular basis. Any other AIS receivers can receive these data. This paper investigate the use of AIS data to develop a system that is able to learn the location of legal fairways around a port given the AIS data collected over a given period of time. The learned fairways information is subsequently used to pre-empt abnormal activities along the fairway. Such a system is therefore capable of better preventing port disasters through better real-time situation awareness.","PeriodicalId":268341,"journal":{"name":"OCEANS 2006 - Asia Pacific","volume":"10 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":"134453614","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}

{"title":"Estimation method for vertical distribution of phytoplankton using monitoring data at the western equatorial Pacific Ocean","authors":"Naoki Nakatani, M. Yabu, Taketoshi Okuno","doi":"10.1109/OCEANSAP.2006.4393921","DOIUrl":"https://doi.org/10.1109/OCEANSAP.2006.4393921","url":null,"abstract":"In order to clarify the oceans role in the overall geochemical cycle of CO2, getting to know a vertical concentration of phytoplankton is very important. The authors measured the vertical distribution of chlorophyll a in the western equatorial Pacific Ocean during the Research Vessel MIRAI cruse (MR01-K05, MR02-K06), and analyzed a number of data which were measured on the ship. The results show that the phytoplankton distribution has strong correlation with mixed layer depth and compensation depth. Using the CTD and ADCP data, the estimated model for the change of chlorophyll distribution is constructed.","PeriodicalId":268341,"journal":{"name":"OCEANS 2006 - Asia Pacific","volume":"34 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":"133837232","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}

{"title":"Seafloor Classification Using Acoustic Backscatter Echo-waveform - Artificial Neural Network Applications","authors":"B. Chakraborty, V. Mahale, G. Navelkar, R. Desai","doi":"10.1109/OCEANSAP.2006.4393981","DOIUrl":"https://doi.org/10.1109/OCEANSAP.2006.4393981","url":null,"abstract":"In this paper seafloor classifications system based on artificial neural network (ANN) has been designed. The ANN architecture employed here is a combination of self organizing feature map (SOFM) and linear vector quantization (LVQ1). Currently acquired echo-waveform data acquired using single beam echo-sounder from twelve seafloor sediment locations from central part of the western continental shelf of India is analyzed and performance of the classifier is presented in this paper.","PeriodicalId":268341,"journal":{"name":"OCEANS 2006 - Asia Pacific","volume":"32 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":"133964223","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}

{"title":"Stability of Call Sequence in Dugongs' Vocalization","authors":"N. Okumura, K. Ichikawa, T. Akamatsu, N. Arai, T. Shinke, T. Hara, K. Adulyanukosol","doi":"10.1109/OCEANSAP.2006.4393936","DOIUrl":"https://doi.org/10.1109/OCEANSAP.2006.4393936","url":null,"abstract":"Dugongs (Dugong dugon) produce different types of vocalization such as chirp, trill, and barks. Previous reports showed that dugongs have two kinds of phonemes: long duration calls (trill) and short duration calls (chirp-squeaks hereinafter called chirp). Especially, the chirp and trill calls were widely reported in different populations. However, characteristics of call patterns in dugongs have never been reported. Moreover, the function of these calls was not revealed. The objective of this study is to classify the vocalization patterns of dugong calls and discuss the stability call sequences within and across local populations of dugongs. We recorded the underwater sound at the off Talibong Island, Trang, Thailand in 2004 and 2005 for 120 hours by an automatic underwater sound recording system (AUSOMS-D, System Intech, Tokyo). The AUSOMS-D is the water resistant stand-alone recording system and developed for passive acoustical monitoring targeting human audible range. The AUSOMS-D consisted of a pair of hydrophones located 2 m apart for calculating the bearings of the sound sources. The electric circuits and batteries were housed in a pressure-resistant case, and the hydrophones were connected to a stereo preamplifier. The sound signals were fed into a 1-kHz high pass filter to eliminate low frequency background noise. Digitized signals were recorded on an 80 GB removable hard disk drive by uncompressed format with a time stamp. The power supply system with batteries and DC/DC converter were also housed inside the case. The sampling frequency of the A/D converter was 44.1 kHz and the dynamic range was 74-120 dB (re 1 muPa) with a 16-bit resolution. Each hydrophone had flat frequency responses within 2 dB between 1 and 10 kHz. For the comparison purpose, we made recording of a captive dugong in Toba Aquarium, Japan, which was introduced from Philippine waters. We analyzed the underwater sound data set that was obtained in both animals in different environment and populations. Short duration calls with less than 300 milliseconds were defined as chirp and trill was defined as a call lasting over 300 milliseconds. The end of a call sequence was defined at the silence over 3 seconds. Total of 1174 audible calls were detected from total of 12 hours data set (from 3:50 to 6:50 1-4 March 2004). Chirp were observed more than trill calls (567 chirps and 67 trills). Chirp-to-chirp transitions were most frequency observed (81.68%), whereas trill-to-trill transitions were the least (4.27%). Transitions between the two types of calls were also observed (6.98%, 7.07%). Trill appeared in the middle and the end of a call sequence. The position of the trill did not differ between wild individual in Thailand and a captive individual from off the Philippines that are considered to be separated populations. The stability of the sequence of each type of calls in a call sequence is investigated. Unlike the song of birds or baleen whales, the call sequence pattern of","PeriodicalId":268341,"journal":{"name":"OCEANS 2006 - Asia Pacific","volume":"192 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":"133265650","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}

{"title":"A Zero based Decision Feedback Equalizer for Underwater Acoustic Communications","authors":"S. Abeysekera, Y. Ye","doi":"10.1109/OCEANSAP.2006.4393902","DOIUrl":"https://doi.org/10.1109/OCEANSAP.2006.4393902","url":null,"abstract":"This paper addresses blind technique of single input multiple output (SIMO) underwater acoutics communication channels estimation and equalization. Subspace channel estimation technique is used as the first step of the proposed technique. The performance of the initial channel estimation can be improved using the second step by exploiting the finite alphabet property at the decsion feedback equalizer (DFE) output. The novelty of this paper is that the SIMO DFE equalizer is designed using estimated channel zeros, and it is faster than the traditional MMSE-DFE. The estiamtion results are compared with blind SIMO channel estimation bounds and the training channel estimation performances.","PeriodicalId":268341,"journal":{"name":"OCEANS 2006 - Asia Pacific","volume":"9 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":"122172719","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}

{"title":"Spectral Analysis of Noise Characteristics Caused by Ship Propeller Cavitation","authors":"Lijie Zhang, Jianguo Huang, Qunfei Zhang","doi":"10.1109/OCEANSAP.2006.4393945","DOIUrl":"https://doi.org/10.1109/OCEANSAP.2006.4393945","url":null,"abstract":"The theoretical model of ship propeller cavitation noise described by random acoustic pulse sequence is presented in this paper. To mathematically describe the basic propeller cavitation noise spectral characteristics, a quasi-periodical pulse series with random position modulation described by odd bilateral exponential attenuate function is proposed. The general spectral formula of propeller cavitation noise is derived. Comparison between the theoretical results and data analysis proves the correctness of the theoretical model. And the line spectrum frequencies and altitudes can be predicted by this model for ships with different types and speeds.","PeriodicalId":268341,"journal":{"name":"OCEANS 2006 - Asia Pacific","volume":"9 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":"126074196","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}

{"title":"Full scale mine burial experiment and comparison with models","authors":"S. Guyonic, M. Mory, T. Wever, F. Ardhuin, T. Garlan, P. Guyomard","doi":"10.1109/OCEANSAP.2006.4393857","DOIUrl":"https://doi.org/10.1109/OCEANSAP.2006.4393857","url":null,"abstract":"Buried sea mine remains a threat still unsolved in spite of new sonar development. Reliable predictions of where and under which conditions mines will bury are not yet available. Field experiments are required for a better understanding of the burial processes. This paper reports on a field experiment carried out between January and April 2004 in the Bay of Brest (France) in cooperation between French and German institutions on two sites. The conditions at the two sites differed through the mean water depths and the hydrodynamics conditions achieved. At Rascas, the sea bed is almost uniquely submitted to tidal and river current flows. Very limited mine burial was observed. The dynamics at the second site is driven by tides and ocean waves. A one week long storm and several swell events were experienced. They resulted in significant mine burial. The first part of the paper reports on the joined analysis of mine burial data, sediment data, sea bed observations and hydrodynamics measurements. In a second part, comparison is made between burial and the predictions of mine burial using various models.","PeriodicalId":268341,"journal":{"name":"OCEANS 2006 - Asia Pacific","volume":"17 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":"123813785","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}