基于用户点击数据的细粒度图像识别方法概述     

俞俊  谭敏  张宏源  张海超 《南京气象学院学报》2017,9(6):567-574

近年来,细粒度图像识别逐渐成为计算机视觉领域的研究热点.由于不同类别图像间的视觉差异小、语义鸿沟问题严重,传统的基于视觉特征的细粒度图像识别性能往往不尽人意.针对这些挑战,目前许多学者都在研究基于用户点击数据的图像识别.本文围绕点击数据在图像识别中数据预处理、特征提取和模型构建3大模块中的应用,总结了已有的基于点击数据的识别算法及最新的研究进展.  相似文献   

Ocean bottom tiltmeter with acoustic data retrieval system implanted by a submersible     

Hideki Shimamura  Toshihiko Kanazawa 《Marine Geophysical Researches》1988,9(3):237-254

Sensitive Ocean Bottom Implanted Tiltmeters (OBITs) with a sophisticated data retrieval system have been developed in order to observe directly the subduction of oceanic lithosphere. The OBIT is the first long-term geophysical instrument which was designed to be deployed by a manned deep-sea submersible. When the OBIT is put on oceanic lithosphere which is bending and is about to subduct under a deep sea trench, the OBIT records the subduction by observing the tilt of the surface of the lithosphere. The OBIT system has a sensitivity of 10^-8 radian, which is enough to detect the ongoing subduction in months or years. The OBIT may give an answer to the question whether there are fluctuations in the subduction rate.Two OBITs were successfully deployed on a seaward slope of the Kuril Trench by the newly built French deep submersible, Nautile. The OBITs were installed on the northwest shoulder of Erimo seamount, at a depth of 3930 m, in the Kuril Trench. In order to attain stable long-term observations of crustal deformations, the sensing unit was cemented onto bare rock by mortar. We have not yet had an opportunity to recover the data.The life of the instruments is expected to be more than five years. An acoustic data transmission system has been developed for the OBIT data recovery. The stored data can be retrieved at any moment during the observation period, with no need to retrieve the instruments nor to interrupt the observation, by use of the acoustic system. The acoustic system has a high data transmission rate as well as extremely low power consumption. This will be the first long-term crustal deformation measurement on the sea floor.  相似文献   

厦门港深水航道整治工程潮流模型试验和泥沙回淤分析   总被引：2，自引：2，他引：2  

徐啸  郑久清 《台湾海峡》2003,22(1):92-101

对厦门港深水航道潮汐水流试验研究和泥沙回淤分析研究结果表明 ,58km长深水航道范围内泥沙总回淤量为 2 80× 1 0 4 m3 a,其中海沧进港航道的墓前礁浅段和猴屿南的嵩鼓水道仍然是回淤率较大的区段 .此外 ,海沧港区的西端由于码头突出原岸线 70 0多米 ,落潮流被挑离码头 ,形成大尺度回流 ,不仅增加了回淤量 ,对船舶靠泊也不利 .对强波浪条件下泥沙集中淤积问题的研究计算结果表明 ,一次大风浪可能造成的回淤率并不大 ,外航道范围内一次大风浪过程 ( 2d)的回淤率不大于 9.0cm d ,内航道不大于 5.0cm d ,港内不大于 2 .5cm d .  相似文献   

The Meiobenthos Along a Mediterranean Deep-Sea Transect off Calvi (Corsica) and in an Adjacent Canyon     

Karline  Soetaert  Carlo  Heip Magda  Vincx 《Marine Ecology》1991,12(3):227-242

Abstract. Meiobenthos densities (excluding hard-shcllcd foraminifcrans) were compared along a Mediterranean deep-sea transect off Calvi (Corsica) and in an adjacent canyon. Chloroplastic Pigment Equivalent values (CPE) provided an estimate of the amount of primary production reaching the bottom.
The stations along the transect were characterized by a low CPE content of the sediment, decreasing with increasing station depth. CPE values in the canyon were much higher, which probably resulted from import of material from the adjacent bay of Calvi. Similarly, meiobenthos densities along the transect were much lower than at comparable depths along the canyon.
Meiobenthos density was significantly and positively correlated with CPE values.
Nematodes were the most abundant taxon at all stations, followed by copepods + nauplii and the soft-shelled foraminiferans. The meiobenthos was most abundant in the upper half centimeter. Nematode and foraminiferan densities tended to decline less rapidly with increasing depth into the sediment. Specimens belonging to the recently described phylum Loricifera, larvae of the parasitic crustacean class Tantulocarida, and fragments of an infaunal Xenophyophoria (large protozoans) are reported for the first time from the Mediterranean.  相似文献   

区别于DSDP-ODP的深海保压保温天然气水合物钻探取心技术   总被引：1，自引：0，他引：1  

许红  吴河勇  徐禄俊  庄茁  熊军  闫桂京  孙和清 《海洋地质前沿》2003,19(6):24-27

到目前为止，任何深海天然气水合物原位岩心样品的钻探、取心技术都离不开ODP(大洋钻探计划)或DSDP(深海钻探计划)专用船舶钻探技术，该技术主要通过从工作母船上连接几百到几千米钻杆到海底，实现500—1000m的钻探，再通过不同类型PCS(保压取心器)与PTCS(保压保温取心器)取心工具实现样品采集。重要特点是投入经费巨大。新型保压保温取心钻具是将钻具直接固定在深海海底，实现样品的原位保真采集，针对国内外两类着底式天然气水合物钻探、取心技术进行了分析，对于深海浅表层天然气水合物原位样品采集作业反映了创新的思维、技术模式、设计方案与科学方法  相似文献   

Continental slope and deep-sea fisheries: implications for a fragile ecosystem   总被引：8，自引：3，他引：8  

Koslow  J. A.; Boehlert  G. W.; Gordon  J. D. M.; Haedrich  R. L.; Lorance  P.; Parin  N. 《ICES Journal of Marine Science》2000,57(3):548-557

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Characterizing uncertainty in target-strength measurements of a deepwater fish: orange roughy (Hoplostethus atlanticus)     

Kloser  R.J; Horne  J.K 《ICES Journal of Marine Science》2003,60(3):516-523

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南海东北部深部构造与中新生代沉积盆地   总被引：9，自引：1，他引：9  

王平  夏戡原  张毅祥  黄慈流 《海洋地质与第四纪地质》2002,22(4):59-65

利用OBS资料作约束条件对南海东北部的地球物理资料，主要是重力资料和多道反射地震资料进行反演，获取比较理想的莫霍面深度，地壳厚度，中生代沉积基底面，新生代沉积底界面等地壳结构信息，研究发现该区中生代沉积盆地形成模式与新生代沉积盆地的形成模式不同，中生代沉积基底与莫霍面呈正相关，而新生代沉积基底则与莫霍面呈明显的镜像关系。中生仝层不受边界断层控制，中生代沉积基底与莫霍面呈正相关，而新生代沉积基底则与莫霍面呈明显的镜像关系。中生代地层不受边界断层控制。中生代沉积坳陷边界实质上是残留的中生代地层的边界，中生代沉积盆地具有大型坳陷沉积特征，而新生代盆地为断陷盆地。  相似文献   

一种新型深海海洋平台——几何形Spar和集成浮力桶的试验研究   总被引：8，自引：1，他引：8  

杨建民张火明  肖龙飞彭涛 《海洋工程》2003,21(4):23-28

介绍了一种新型深海海洋平台——几何形Spar壳体概念和集成浮力桶立管支撑概念，并与常规Spar和桁架式Spar进行了比较。为测定多角形Spar和集成浮力桶在不同环境条件下运动响应的总体性能，设计并完成了在海洋工程水池中的模型试验，此类试验在国内尚属首次。  相似文献   

Processing and attenuation of noise in deep seismic-reflection data from the Gulf of Maine     

D. R. Hutchinson  M. W. Lee 《Marine Geophysical Researches》1989,11(1):51-67

The U.S. Geological Survey deep crustal studies reflection profile across the Gulf of Maine off southeastern New England was affected by three sources of noise: side-scattered noise, multiples, and 20-Hz whale sounds. The special processing most effective in minimizing this noise consisted of a combination of frequency-wavenumber (F-K) filtering, predictive deconvolution, and spectral whitening, each applied in the shot domain (prestack). Application of the F-K filter to remove side-scatter noise in the poststack domain resulted in a much poorer quality profile. The prestack noise suppression processing techniques resulted in a reflection profile with good signal-to-noise ratios and reliable strong reflections, especially at depths equivalent to the lower crust (24–34 km). Certain geologic features, such as a buried rift basin and a crustal fault are resolved much better within the upper crust after this processing. Finite difference migration of these data using realistic velocities produced excellent results. Migration was essential to distinguish between abundant dipping and subhorizontal reflections in the lower crust as well as to show an essentially transparent upper mantle.  相似文献