UNDERWATER TECHNOLOGY最新文献_第2页

China - reaping the rewards of long-term investment in capability and education 中国——在能力和教育方面的长期投资正在获得回报

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UNDERWATER TECHNOLOGY Pub Date : 2020-11-18 DOI: 10.3723/ut.37.067

S. Hall

引用次数: 0

Optimal design of buckling resistance for a large deepwater functional tank (DFT) 大型深水功能储罐(DFT)抗屈曲优化设计

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UNDERWATER TECHNOLOGY Pub Date : 2020-11-18 DOI: 10.3723/ut.37.103

Wang Yi, Zhang Fangfang, Xu Fan

引用次数: 0

Hierarchical classification of time series data aggregation in underwater wireless sensor networks 水下无线传感器网络中时间序列数据聚合的分层分类

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UNDERWATER TECHNOLOGY Pub Date : 2020-07-30 DOI: 10.3723/ut.37.053underwater

D. Ruby, J. Jeyachidra

{"title":"Hierarchical classification of time series data aggregation in underwater wireless sensor networks","authors":"D. Ruby, J. Jeyachidra","doi":"10.3723/ut.37.053underwater","DOIUrl":"https://doi.org/10.3723/ut.37.053underwater","url":null,"abstract":"Environmental fluctuations are continuous and provide opportunities for further exploration, including the study of overground, as well as underground and submarine, strata. Underwater wireless sensor networks (UWSNs) facilitate the study of ocean-based submarine and marine parameters\u0000 details and data. Hardware plays a major role in monitoring marine parameters; however, protecting the hardware deployed in water can be difficult. To extend the lifespan of the hardware, the inputs, processing and output cycles may be reduced, thus minimising the consumption of energy and\u0000 increasing the lifespan of the devices. In the present study, time series similarity check (TSSC) algorithm is applied to the real-time sensed data to identify repeated and duplicated occurrences of data for reduction, and thus improve energy consumption. Hierarchical classification of ANOVA\u0000 approach (HCAA) applies ANOVA (analysis of variance) statistical analysis model to calculate error analysis for realtime sensed data. To avoid repeated occurrences, the scheduled time to read measurements may be extended, thereby reducing the energy consumption of the node. The shorter time\u0000 interval of observations leads to a higher error rate with lesser accuracy. TSSC and HCAA data aggregation models help to minimise the error rate and improve accuracy.","PeriodicalId":44271,"journal":{"name":"UNDERWATER TECHNOLOGY","volume":"34 1","pages":"53-64"},"PeriodicalIF":0.4,"publicationDate":"2020-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78355552","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

Reliability of cluster head node based upon parametric constraints in underwater acoustic sensor networks 基于参数约束的水声传感器网络簇头节点可靠性研究

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UNDERWATER TECHNOLOGY Pub Date : 2020-07-30 DOI: 10.3723/ut.37.039

G. Sharma, Shilpi Harnal, Neha Miglani, Savita Khurana

引用次数: 1

Case studies in estimating subsea systems' readiness level 评估海底系统就绪水平的案例研究

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UNDERWATER TECHNOLOGY Pub Date : 2020-03-25 DOI: 10.3723/ut.37.013

S. Yasseri, H. Bahai

{"title":"Case studies in estimating subsea systems' readiness level","authors":"S. Yasseri, H. Bahai","doi":"10.3723/ut.37.013","DOIUrl":"https://doi.org/10.3723/ut.37.013","url":null,"abstract":"Systems readiness level (SRL) is a metric defined for assessing progress in the development of systems. The methodologies to estimate SRLs are built on the technology readiness level (TRL), originally developed by NASA to assess the readiness of new technologies for insertion into a\u0000 system. TRL was later adopted by governmental institutions and many industries, including the American Petroleum Institute (API). The TRL of each component is mathematically combined with another metric, integration readiness level (IRL), to estimate the overall level of readiness of a system.\u0000 An averaging procedure is then used to estimate the composite level of systems readiness. The present paper builds on the previous paper by Yasseri (2013) and presents case examples to demonstrate the estimation of SRL using two approaches. The objective of the present paper is to show how\u0000 the TRL, IRL, and SRL are combined mathematically. The performance of the methodology is also demonstrated in a parametric study by pushing the states of readiness to their extremes, namely very low and very high readiness. The present paper compares and contrasts the two major\u0000 system readiness levels estimation methods: one proposed by Sauser et al. (2006) for defence acquisition based on NASA's TRL scale, and another based on API's TRL scale. The differences and similarities are demonstrated using a case study.","PeriodicalId":44271,"journal":{"name":"UNDERWATER TECHNOLOGY","volume":"28 1","pages":"13-27"},"PeriodicalIF":0.4,"publicationDate":"2020-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87086429","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 simple in situ labelling approach and adequate tools for photo and video quadrats used in underwater ecological studies 一种简单的原位标记方法和适当的工具，用于水下生态研究的照片和视频样方

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UNDERWATER TECHNOLOGY Pub Date : 2020-03-25 DOI: 10.3723/ut.37.029

B. Moreno

引用次数: 3

Collision avoidance with control barrier function for target tracking of an unmanned underwater vehicle 具有控制屏障功能的无人潜航器目标跟踪避碰

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UNDERWATER TECHNOLOGY Pub Date : 2020-03-25 DOI: 10.3723/ut.37.003

Z. Deng, M. T. Zaman, Zhenzhong Chu

引用次数: 3

It's time to reveal a long love affair 是时候揭露一段长久的恋情了

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UNDERWATER TECHNOLOGY Pub Date : 2020-03-25 DOI: 10.3723/ut.37.001

Judith Patten

引用次数: 0

Signal transmission through seawater for MHz frequencies and medium distances (0–30 m) using ionic current waves 利用离子电流波通过海水进行兆赫频率和中距离(0-30米)的信号传输

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UNDERWATER TECHNOLOGY Pub Date : 2019-11-27 DOI: 10.3723/ut.36.053

J. Lucas

{"title":"Signal transmission through seawater for MHz frequencies and medium distances (0–30 m) using ionic current waves","authors":"J. Lucas","doi":"10.3723/ut.36.053","DOIUrl":"https://doi.org/10.3723/ut.36.053","url":null,"abstract":"Electromagnetic (EM) signals can only be transmitted through seawater for short distances (<1 m) for frequencies (>1 MHz). Therefore a new technique, the ionic current wave (ICW), has been developed for signal propagation at MHz frequency. This technique uses the conduction current\u0000 produced in seawater as a result of thermal ionisation releasing H+ and OH– ions. A small voltage (<1.5 V pk) is applied between two metal electrodes submerged in the seawater to avoid ionisation by the input electrical energy. A detailed theoretical\u0000 analysis of the ICW process has shown that ionic currents can be transmitted at MHz frequency over distances of 10 m with low signal loss per decade. For longer propagation distances of 100 m the theory predicts a signal loss of –20 dB per decade. Propagation experiments have\u0000 been carried out in Liverpool dock seawater for distances of 2 m–28 m between parallel 0.5 m × 0.3 m electrodes placed vertically in the seawater at a depth of 2 m. Signal frequencies within the range of 1 MHz–8 MHz have been investigated. In each experiment the received\u0000 propa gated signal power was approximately –67 dBm (well above the dock electrical noise of –140 dBm) and only showed a small power loss over the full range of propagation. The ICW system will be able to measure longer propagation distances in deep seawater conditions\u0000 suitable for ship and submarine communications. Its performance is comparable to that of sonar systems.","PeriodicalId":44271,"journal":{"name":"UNDERWATER TECHNOLOGY","volume":"48 1","pages":"53-61"},"PeriodicalIF":0.4,"publicationDate":"2019-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78510592","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 novel initiative on vertical-axis underwater turbine suitable for low underwater current velocities 一种适用于低水下流速的垂直轴水下水轮机的新方案

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UNDERWATER TECHNOLOGY Pub Date : 2019-11-27 DOI: 10.3723/ut.36.043

J. Agbakwuru, U. Ibrahim

引用次数: 1