目前网购平台的搜索对象仍以文字为主,致使搜索效率低下。文章以广受女性欢迎的浅口高跟鞋为例,对利用图片进行款式自动识别的技术进行探索。以网购平台上收集的3类浅口高跟鞋(粗跟、细跟、坡跟)共900张图片(每款随机抽取200张作为训练...目前网购平台的搜索对象仍以文字为主,致使搜索效率低下。文章以广受女性欢迎的浅口高跟鞋为例,对利用图片进行款式自动识别的技术进行探索。以网购平台上收集的3类浅口高跟鞋(粗跟、细跟、坡跟)共900张图片(每款随机抽取200张作为训练集,剩余100张作为测试集)为研究对象,然后利用深度学习中的Faster R CNN检测模型对浅口高跟鞋款式进行训练和测试识别。结果表明:无论以鞋跟为目标区域,还是以整只鞋为检测区域,利用该模型都能对浅口高跟鞋图像实现良好的款式识别,准确率可达94%以上,且不用经过人为特征提取,方便可行;Faster R CNN检测模型的总体精度和检测速度比R CNN、SPP-Net、FAST R CNN更优。展开更多
Oyster reefs have an equivalent, complex 3-dimensional structure to vegetated habitats and may provide similar functions in estuarine environments. Nevertheless, few studies have compared oyster reefs with adjacent na...Oyster reefs have an equivalent, complex 3-dimensional structure to vegetated habitats and may provide similar functions in estuarine environments. Nevertheless, few studies have compared oyster reefs with adjacent natural shallow-water habitats. Here the resident benthic macroinvertebrate communities in an artificial oyster （Crassostrea ariakensis） reef and in adjacent natural estuarine shallow-water habitats （salt marsh, intertidal mudflat, and subtidal soft bottom） in the Changjiang （Yangtze） River estuary were described. The mean total densities and biomass, Margalef＇s species richness, Pielou＇s evenness and Shannon-Weaver biodiversity indices of the resident benthic macroinvertebrate communities differed significantly among the habitats. Significantly higher densities and biomass of benthic macroinvertebrates occurred in the oyster reef compared with the other three habitats. Ordination plots showed a clear separation in benthic macroinvertebrate communities among the four habitat types. The results demonstrated that the artificial oyster reef supported distinct and unique benthic communities, playing an important role in the complex estuarine habitat by supplying prey resources and contributing to biodiversity. In addition, the results suggested that the oyster reef had been restored successfully.展开更多
The French Atlantic coast seismicity is minor to moderate. Nevertheless, in western （north and central） part of France, the active tectonics related to the south Armorican and the Bay of Biscay context results somet...The French Atlantic coast seismicity is minor to moderate. Nevertheless, in western （north and central） part of France, the active tectonics related to the south Armorican and the Bay of Biscay context results sometimes in shallow earthquakes with magnitude above five （e.g., the Oleron seismic crisis, magnitude （local） = 5.2, 1972）. The Charente region is featured by semi-diurnal tides that reach about six meters in height during the high tide period. Inlets are the main features of the Atlantic margin geomorphology nearby the Charente. Minor tsunamis have been observed and reported in the past. Here, we present a tsunami modelling computed with the TELEMAC package that solves the non linear shallow water equations. This work helps to identify the role of the inlets that characterize the Charente＇s geomorphology on water wave＇s propagation. A tidal model is considered while the tsunami simulation is performed. The modelling results show that the Antioche, the Maumusson and the Pertuis inlets protect the Charente coast from destructive waves.展开更多
文摘目前网购平台的搜索对象仍以文字为主,致使搜索效率低下。文章以广受女性欢迎的浅口高跟鞋为例,对利用图片进行款式自动识别的技术进行探索。以网购平台上收集的3类浅口高跟鞋(粗跟、细跟、坡跟)共900张图片(每款随机抽取200张作为训练集,剩余100张作为测试集)为研究对象,然后利用深度学习中的Faster R CNN检测模型对浅口高跟鞋款式进行训练和测试识别。结果表明:无论以鞋跟为目标区域,还是以整只鞋为检测区域,利用该模型都能对浅口高跟鞋图像实现良好的款式识别,准确率可达94%以上,且不用经过人为特征提取,方便可行;Faster R CNN检测模型的总体精度和检测速度比R CNN、SPP-Net、FAST R CNN更优。
基金Supported by the Special Fund of Chinese Central Government for Basic Scientific Research Operations in Commonweal Research Institutes(East China Sea Fisheries Research Institute)(No.2011M01)the National Natural Science Foundation of China(No.31170508)the National Basic Research Program of China(973 Program)(No.2010CB429005)
文摘Oyster reefs have an equivalent, complex 3-dimensional structure to vegetated habitats and may provide similar functions in estuarine environments. Nevertheless, few studies have compared oyster reefs with adjacent natural shallow-water habitats. Here the resident benthic macroinvertebrate communities in an artificial oyster （Crassostrea ariakensis） reef and in adjacent natural estuarine shallow-water habitats （salt marsh, intertidal mudflat, and subtidal soft bottom） in the Changjiang （Yangtze） River estuary were described. The mean total densities and biomass, Margalef＇s species richness, Pielou＇s evenness and Shannon-Weaver biodiversity indices of the resident benthic macroinvertebrate communities differed significantly among the habitats. Significantly higher densities and biomass of benthic macroinvertebrates occurred in the oyster reef compared with the other three habitats. Ordination plots showed a clear separation in benthic macroinvertebrate communities among the four habitat types. The results demonstrated that the artificial oyster reef supported distinct and unique benthic communities, playing an important role in the complex estuarine habitat by supplying prey resources and contributing to biodiversity. In addition, the results suggested that the oyster reef had been restored successfully.
文摘The French Atlantic coast seismicity is minor to moderate. Nevertheless, in western （north and central） part of France, the active tectonics related to the south Armorican and the Bay of Biscay context results sometimes in shallow earthquakes with magnitude above five （e.g., the Oleron seismic crisis, magnitude （local） = 5.2, 1972）. The Charente region is featured by semi-diurnal tides that reach about six meters in height during the high tide period. Inlets are the main features of the Atlantic margin geomorphology nearby the Charente. Minor tsunamis have been observed and reported in the past. Here, we present a tsunami modelling computed with the TELEMAC package that solves the non linear shallow water equations. This work helps to identify the role of the inlets that characterize the Charente＇s geomorphology on water wave＇s propagation. A tidal model is considered while the tsunami simulation is performed. The modelling results show that the Antioche, the Maumusson and the Pertuis inlets protect the Charente coast from destructive waves.
