检索结果-内蒙古大学图书馆

A statistical algorithm for Estimating Chlorophyll Concentration in the New Caledonian Lagoon

REMOTE SENSING 2016年第1期8卷 45页

作者： Wattelez, Guillaume Dupouy, Cecile Mangeas, Morgan Lefevre, Jerome Touraivane Frouin, Robert Univ New Caledonia Sci & Technol Dept Nouville Campus BP R4 Noumea 98851 New Caledonia Univ Toulon & Var Aix Marseille Univ CNRS Mediterranean Inst OceanogINSUUM 110 F-13288 Marseille France Inst Rech Dev BP A5 98848 Noumea 98848 New Caledonia Univ French Guiana Univ Reunion Univ Montpellier 2 Univ French West IndiesIRDESPACE DEV UMR 228 F-34093 Montpellier France Univ Toulouse CNES CNRS LEGOS IRDUPS F-31401 Toulouse France Univ Calif San Diego Scripps Inst Oceanog La Jolla CA 92037 USA

Spatial and temporal dynamics of phytoplankton biomass and water turbidity can provide crucial information about the function, health and vulnerability of lagoon ecosystems (coral reefs, sea grasses, etc.). A statistical algorithm is proposed to estimate chlorophyll-a concentration ([chl-a]) in optically complex waters of the New Caledonian lagoon from MODIS-derived remote-sensing reflectance (R-rs). The algorithm is developed via supervised learning on match-ups gathered from 2002 to 2010. The best performance is obtained by combining two models, selected according to the ratio of R-rs in spectral bands centered on 488 and 555 nm: a log-linear model for low [chl-a] (AFLC) and a support vector machine (SVM) model or a classic model (OC3) for high [chl-a]. The log-linear model is developed based on SVM regression analysis. This approach outperforms the classical OC3 approach, especially in shallow waters, with a root mean squared error 30% lower. The proposed algorithm enables more accurate assessments of [chl-a] and its variability in this typical oligo- to meso-trophic tropical lagoon, from shallow coastal waters and nearby reefs to deeper waters and in the open ocean.

关键词： chlorophyll-a concentration MODerate resolution Imaging Spectroradiometer (MODIS) ocean color remote sensing statistical algorithm oligotrophic waters New Caledonia coral lagoon

来源：评论

学校读者我要写书评

暂无评论

A statistical algorithm for estimating chlorophyll concentration from MODIS data

A statistical algorithm for estimating chlorophyll concentra...

引用

Conference on Ocean Remote Sensing and Monitoring from Space

作者： Wattelez, Guillaume Dupouy, Cecile Mangeas, Morgan Lefevre, Jerome Touraivane, T. Frouin, Robert Univ New Caledonia Campus Nouville BP R4 Noumea 98851 New Caledonia IRD MOI Noumea 98848 New Caledonia IRD ESPACE DEV Noumea 98848 New Caledonia IRD LEGOS Noumea 98848 New Caledonia Univ Calif San Diego Scripps Inst Oceanog La Jolla CA 92093 USA

ISBN: (纸本)9781628413281

We propose a statistical algorithm to assess chlorophyll-a concentration ([chl-a]) using remote sensing reflectance (Rrs) derived from MODerate Resolution Imaging Spectroradiometer (MODIS) data. This algorithm is a combination of two models: one for low [chl-a] (oligotrophic waters) and one for high [chl-a]. A satellite pixel is classified as low or high [chla] according to the Rrs ratio (488 and 555 nm channels). If a pixel is considered as a low [chl-a] pixel, a log-linear model is applied;otherwise, a more sophisticated model (Support Vector Machine) is applied. The log-linear model was developed thanks to supervised learning on Rrs and [chl-a] data from SeaBASS and more than 15 campaigns accomplished from 2002 to 2010 around New Caledonia. Several models to assess high [chl-a] were also tested with statistical methods. This novel approach outperforms the standard reflectance ratio approach. Compared with algorithms such as the current NASA OC3, Root Mean Square Error is 30% lower in New Caledonian waters.

关键词： Chlorophyll-a (chl-a) MODerate Resolution Imaging Spectroradiometer ( MODIS) Ocean color Remote-sensing statistical algorithm Oligotrophic waters New Caledonian lagoon

来源：评论

学校读者我要写书评

暂无评论

The statistical algorithm of simultaneity coefficient based on real-time data of typical consumers from power measurement system

The statistical algorithm of simultaneity coefficient based ...

引用

International Conference on Power System Technology

作者： Li, XM Su, WH Yin, XG Liu, SQ Zhang, LM Shanghai Power Supply Bur Shanghai 200000 Peoples R China

ISBN: (纸本)0780374592

In order to get a reasonable simultaneity coefficient rather than one offered by the regulations and the design handbook, a statistical algorithm to computer the simultaneity coefficient based on the real-time data of the practical electrical network is presented in this paper. This algorithm uses the data of the typical consumers' load power from power measurement system to compute the simultaneity coefficient. This kind of simultaneity coefficient can reflect characteristic of the practical electrical network. The algorithm of simultaneity coefficient can be applied to the power system planning and designing, the load forecast and the distribution automation.

关键词： distribution automation daily load curve load characteristic load forecast power measurement system power system planning real-time data statistical algorithm simultaneity coefficient peak load

来源：评论

学校读者我要写书评

暂无评论

EXPERIMENTAL VALIDATION OF statistical algorithm FOR DIAGNOSIS OF DAMAGE FAULT

EXPERIMENTAL VALIDATION OF STATISTICAL ALGORITHM FOR DIAGNOS...

引用

22nd IEEE Canadian Conference on Electrical and Computer Engineering

作者： Kumar, Amar Nayak, Amiya Srivastava, Alka Goel, Nita Tecsis Corp R&D Ctr 210 Colonnade Rd Ottawa ON Canada Univ Ottawa SITE Ottawa ON Canada

ISBN: (纸本)9781424435098

A statistical algorithm was developed for the damage fault diagnosis and prognosis tool and the present work focuses on the experimental validation. The oxide scale growth experiments using laboratory samples under thermal cycling simulate the hot section turbine blade coating failures. The experimental steps, oxide thickness data measurement, collection and sampling procedures are discussed. Three data samples each from two groups under different thermal cycling conditions are considered. The data are subjected to randomness check, preprocessing, rank sum test etc. The validation is carried out with 15 possible combinations for analysis. Consistent with the mean thickness distribution for the samples in two groups, the statistical algorithm for damage and anomaly diagnosis yields expected results.

关键词： Fault diagnosis validation oxide thickness statistical algorithm rank sum test

来源：评论

学校读者我要写书评

暂无评论

Research on Tibetan Information Processing Framework Based on statistical Information Retrieval algorithm

Research on Tibetan Information Processing Framework Based o...

引用

2018 8th ESE International Conference on Sports and Social Sciences(ESE-SSS 2018)

作者： Zhuome Renqing Northwest Minzu University

With the rapid development of computer technology and network technology,the number of electronic documents has expanded ***,comprehensively and accurately finding the information and information needed in this vast amount of information has become the focus of attention and has become a hot topic in the research *** a typical example of human language,Tibetan has the common way of thinking and language *** the development of Tibetan information technology,the efforts of many researchers in research institutes,institutions of higher learning and enterprises have achieved fruitful results,which has made Tibetan word processing technology *** the popularity of the Internet and the arrival of the era of big data,the data of Tibetan electronic resources has grown rapidly,and these data have become the cornerstone for the further development of Tibetan information *** present,many achievements have been made in the fields of Tibetan processing and statement processing,but there are still many unresolved problems.

关键词： statistical algorithm Data mining Information retrieval algorithm Data acquisition Tibetan Information processing Framework

来源：评论

学校读者我要写书评

暂无评论

Seismic Damage Detection for a Masonry Building Using Aftershock Monitoring Data

引用

ADVANCES IN STRUCTURAL ENGINEERING 2013年第4期16卷 605-618页

作者： Zhou, Wensong Li, Hui Mao, Chenxi Mevel, Laurent Ou, Jinping Harbin Inst Technol Sch Civil Engn Harbin 150090 Peoples R China China Earthquake Adm Inst Engn Mech Harbin 150080 Peoples R China IRISA F-35042 Rennes France Dalian Univ Technol Sch Civil & Hydraul Engn Dalian 116024 Peoples R China

The problem of detecting structural damage by exploiting vibration signal measurements produced from earthquake excitation is addressed in this work. Following the Wenchuan earthquake of 12 May 2008, a residential masonry building was selected for instrumentation with accelerometers by the Harbin Institute of Technology. This building had been damaged in the Wenchuan earthquake. It represents a rare case of an instrumented building that has been previously damaged, thus serving as a full-scale benchmark model to evaluate structural identification and damage detection methods. More than 20 earthquakes were recorded by the system after the building was instrumented. For detecting the structural damage, a vibration-based damage detection algorithm for structures under earthquake excitation is introduced in this paper. This method is based on a residual associated with subspace-based modal identification, with global chi(2)-tests built on this residual. This method makes effective use of non-stationary and limited duration earthquake excitation, handles the uncertainties, and further detects the structural damage. The results obtained from these structural responses and earthquake excitations are reported using both identification and damage detection methods.

关键词： damage detection earthquake excitation seismic monitoring vibration statistical algorithm

来源：评论

学校读者我要写书评

暂无评论

Time Series Analysis of Soil Radon Data Using Multiple Linear Regression and Artificial Neural Network in Seismic Precursory Studies

引用

PURE AND APPLIED GEOPHYSICS 2017年第7期174卷 2793-2802页

作者： Singh, S. Jaishi, H. P. Tiwari, R. P. Tiwari, R. C. Mizoram Univ Dept Phys Aizawl 796004 India Mizoram Univ Dept Geol Aizawl 796004 India

This paper reports the analysis of soil radon data recorded in the seismic zone-V, located in the northeastern part of India (latitude 23.73N, longitude 92.73E). Continuous measurements of soil-gas emission along Chite fault in Mizoram (India) were carried out with the replacement of solid-state nuclear track detectors at weekly interval. The present study was done for the period from March 2013 to May 2015 using LR-115 Type II detectors, manufactured by Kodak Pathe, France. In order to reduce the influence of meteorological parameters, statistical analysis tools such as multiple linear regression and artificial neural network have been used. Decrease in radon concentration was recorded prior to some earthquakes that occurred during the observation period. Some false anomalies were also recorded which may be attributed to the ongoing crustal deformation which was not major enough to produce an earthquake.

关键词： Radon measurements SSNTDs MLR and ANN analysis earthquake precursors statistical algorithm meteorological parameters

来源：评论

学校读者我要写书评

暂无评论

Improvement of algorithm on the track recognition

引用

APPLIED MATHEMATICS AND COMPUTATION 2008年第2期205卷 635-647页

作者： Wu, Qing'e Wang, Tuo Huang, Yongxuan Li, Jisheng Xian Jiaotong Univ Sch Elect & Informat Engn State Key Lab Mfg Syst Xian 710049 Shaanxi Peoples R China

For more exact navigation and positioning on the navigation systems, this paper discusses the improvement of statistical algorithms based on fuzzy knowledge with a brand-new theory. The improved fusion algorithms based on Bayesian theory and fuzzy methods on the track recognition are also given, respectively. However, this paper mainly makes a comparison of the improved new algorithms and two old algorithms for track recognition. The computer simulation shows the validity and feasibility of two improved algorithms. At the same time, the simulation results show that the overall performance of two improved algorithms for the track recognition all is better than that of the probabilistic algorithms. Based on the experiments in the dense target environment, the correct average recognition rate of statistical algorithms is 66.96% at the highest;that of the improved new algorithm based on fuzzy knowledge is 77.98%, that of the Bayesian fusion algorithm is 86.75%, however, that of the fuzzy fusion algorithm can be 90.14%. These results support the usefulness of the two improved algorithms. (C) 2002 Elsevier Science. All rights reserved. (C) 2008 Elsevier Inc. All rights reserved.

关键词： statistical algorithm Fuzzy algorithm Bayesian fusion algorithm Fuzzy fusion algorithm Track recognition Test statistics Threshold value

来源：评论

学校读者我要写书评

暂无评论

Techniques of Electromagnetic Compatibility Model Synthesis Based on On-Site Measurement Data

引用

IEICE TRANSACTIONS ON COMMUNICATIONS 2013年第9期E96B卷 2251-2260页

作者： Li, Gaosheng Liu, Peiguo Li, Yan Lu, Zhonghao Zhou, Dongming Qin, Yujian Natl Univ Def Technol Coll Elect Sci & Engn Changsha Hunan Peoples R China

Regular on-site testing is an elementary means to obtain real-time data and state of Electromagnetic Compatibility (EMC) of electronics systems. Nowadays, there is a lot of measured EMC data while the application of the data is insufficient. So we put forward the concept of EMC model synthesis. To carry out EMC data mining with measured electromagnetic data, we can build or modify models and synthesize variation rules of electromagnetic parameters of equipment and EMC performance of systems and platforms, then realize the information synthesis and state prediction. The concept of EMC reliability is brought forward together with the definition and description of parameters such as invalidation rate and EMC lifetime. We studied the application of statistical algorithms and Artificial Neural Network (ANN) in model synthesis. Operating flows and simulation results as well as measured data are presented. Relative research can support special measurement, active management and predictive maintenance and replenishment in the area of EMC.

关键词： electromagnetic compatibility maintenance on-site measurement model synthesis statistical algorithm artificial neural network

来源：评论

学校读者我要写书评

暂无评论

TOWARD AN OPTIMAL algorithm FOR OVARIAN-CANCER SCREENING WITH LONGITUDINAL TUMOR-MARKERS

引用

CANCER 1995年第10期76卷 2004-2010页

作者： SKATES, SJ XU, FJ YU, YH SJOVALL, K EINHORN, N CHANG, YC BAST, RC KNAPP, RC HARVARD UNIV SCH MEDBOSTONMA 02115 UNIV TEXAS MD ANDERSON CANC CTRHOUSTONTX 77030 KAROLINSKA INST STOCKHOLMSWEDEN

Stored samples from women in the Stockholm screening study were reassayed for CA125II (Centocor, Malvern, PA) and OVX1. The postmenopausal women older than age 50 without ovarian cancer were randomly split into a training set to develop a screening test based on longitudinal marker levels and a second set to validate the test. The CA125II data from each woman is summarized by the slope and intercept from a linear regression of log(CA125II) on time since first sample. The slope versus the intercept for the training set and the ovarian cancer cases formed a bivariate scatter plot. A curve was drawn on the scatter plot that separated most of the women with ovarian cancer from all other women;it delineated a screening test. The specificity of this test was examined on the validation set with a specificity of 99.8%. Bayes' theorem was used to calculate the risk of ovarian cancer (ROC) based on the intercept, slope, and assay variability. It is important to account for assay variability because it can produce large slopes over short periods of time, The maximum risk, which identified 83% (5 of 6) of the ovarian cancers detected within a year of last assay, was applied as a test to the training set and confirmed a high specificity of 99.7%. With this specificity and sensitivity, the ROC algorithm using the CA125II assay has an estimated positive predictive value of 16%, substantially greater than the positive predictive value based on a single assay. Further study is planned to confirm the sensitivity of this approach.

关键词： OVARIAN CANCER EARLY DETECTION SERUM MARKERS CA 125 statistical algorithm

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：