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| 1 | A NON-PARAMETER BAYESIAN CLASSIFIER FOR FACE RECOGNITION显示文摘A non-parameter Bayesian classifier based on Kernel Density Estimation (KDE)is presented for face recognition, which can be regarded as a weighted Nearest Neighbor (NN)classifier in formation. The class conditional density is estimated by KDE and the bandwidthof the kernel function is estimated by Expectation Maximum (EM) algorithm. Two subspaceanalysis methods-linear Principal Component Analysis (PCA) and Kernel-based PCA (KPCA)are respectively used to extract features, and the proposed method is compared with ProbabilisticReasoning Models (PRM), Nearest Center (NC) and NN classifiers which are widely used in facerecognition systems. The experiments are performed on two benchmarks and the experimentalresults show that the KDE outperforms PRM, NC and NN classifiers. | Liu Qingshan Lu Hanqing Ma Songde (Nat. Lab of Pattern Recognition, Inst. of Automation, Chinese Academy of Sciences, Beijing 100080) | 2003 | Journal of Electronics(China)2003，20，5： | 9 |
| 2 | Evaluation of mercury methylation in fresh and pre dried sediments using ^(203)Hg radioisotope显示文摘Mercury methylation rates in fresh and pre dried river sediments were determined in sediment water systems spiked with 203 HgCl 2 at a level of 0.75—0.95 ppm as Hg. At the end of the incubation period (21—38 days), methylmercury production in the fresh sediments was in the order of 3.0% to 13.75%, whereas in the pre dried sediments the methylation was much lower, at 0.6% to 3.9%. The highest methylation levels were generally recorded in the uppermost, 1 cm layer of the sediment column. Total mercury concentration in water in equilibrium with the 203 Hg spiked fresh sediments was in the range of 44.7 to 634 ng/L, whereas in equilibrium with the pre dried sediments the concentration was in the range of 19.5 to 34.5 ng/L. The proportion of methylmercury to total mercury in the water varied from 9.4% to 66.6% over the fresh sediments, and from 7.1% to 10.8% over the pre dried sediments. In the system consisting of water, sediment and sediment inverterbrates the concentrations of methylmercury were 8.61 to 15.69 ng/g in the sediment, 0.011 ng/ml in the water, and 9.22 to 40.69 ng/g in the inverterbrates. Methylmercury bioaccumualtion factors (BAFs) were in the order of 274 to 8087 relative to the water, and 0.25 to 7.31 relative to the sediment. These results provide further evidence for the tendency of methylmercury to accumulate in high concentrations in aquatic organisms, even at very low total mercury concentration in water. | J.R.Ikingura 1, H.Akagi 2, J.R.D.Guimaraes 3 (1. University of Dar es Salaam, P.O.Box 35052, Dar es Salaam, Tanzania 2. Nat. Inst. for Minamata Disease, 4058 Hama, Minamata, 867 Kumamoto, Japan 3. Lab. de Radioisotopos, Universidade Federal Do Rio | 2000 | Journal of Environmental Sciences2000，12，S1： | 2 |
| 3 | CONSIDERING NEIGHBORHOOD INFORMATION IN IMAGE FUZZY CLUSTERING显示文摘Fuzzy C-means clustering algorithm is a classical non-supervised classification method.For image classification, fuzzy C-means clustering algorithm makes decisions on a pixel-by-pixel basis and does not take advantage of spatial information, regardless of the pixels' correlation. In this letter, a novel fuzzy C-means clustering algorithm is introduced, which is based on image's neighborhood system. During classification procedure, the novel algorithm regards all pixels'fuzzy membership as a random field. The neighboring pixels' fuzzy membership information is used for the algorithm's iteration procedure. As a result, the algorithm gives a more smooth classification result and cuts down the computation time. | Huang Ning Zhu Minhui Zhang Shourong(The Nat. Key Lab of Microwave Imaging Tech, Inst. of Electronics, CAS, Beijing 100080) | 2002 | Journal of Electronics(China)2002，19，3： | 2 |
| 4 | Azithromycin versus penicillin V for the treatment of early lyme borreliosis显示文摘 | Dr. med. K. Weber Dr. med. Bettina Wilske Dr. rer. nat. Vera Preac-Mursic Prof. Dr. med. R. Thurmayr | 1993 | Infection1993，，6： | 1 |
| 5 | Basic aspects of the pathogenesis of staphylococcal polymer-associated infections显示文摘 | PD Dr. med. C. Eiff Dr. rer. nat. C. Heilmann PD Dr. med. M. Herrmann Prof. Dr. med. G. Peters | 1999 | Infection1999，，1： | 1 |
| 6 | A NOVEL SHIP WAKE DETECTION METHOD OF SAR IMAGES BASED ON FREQUENCY DOMAIN显示文摘Moving ships produce a set of waves of 'V' pattern on the ocean. These waves can often be seen by Synthetic Aperture Radar (SAR). The detection of these wakes can provide important information for surveillance of shipping, such as ship traveling direction and speed. A novel approach to the detection of ship wakes in SAR images based on frequency domain is provided in this letter. Compared with traditional Radon-based approaches, computation is reduced by 20%-40% without losing nearly any of detection performance. The testing results using real data and simulation of synthetic SAR images test the algorithm's feasibility and robustness. | Liu Hao Zhu Minhui (Nat. Key Lab. of Microwave Imaging Tech., Inst. of Electron., Chinese Academy of Sci., Beijing 100080) | 2003 | Journal of Electronics(China)2003，20，4： | 0 |
| 7 | A Two-Dimensional Brightness Distribution of the Visible Zodiacal Light显示文摘By adopting a recently developed semi empirical methodology for removing the atmospheric diffuse light and an improved technique of individual star subtraction, we have newly reduced the distribution of the visible zodiacal light (ZL) brightness from almucantar scan observations of the night sky brightness at Mt. Haleakala, Hawaii. The resulting two dimensional map of the ZL brightness covers the sky over 40°≤λ-λ ⊙≤320° and -40°≤β≤40° and its angular resolution 2°×2°is fine enough to reveal optical counterparts of the structures in the zodiacal emission first found from the IRAS space observations. | S.M.Kwon 1, S.S.Hong 2, J.L.Weinberg 3 1 ( Dept. of Science Education, Kangwon Nat. Univ., Chunchon 200 701,KOREA ) 2 ( Department of Astronomy, Seoul Nat. Univ., Seoul 151 742,KOREA ) 3 ( Technology Care Givers, Snellville,G A 30039,U.S.A. ) | 1999 | 天文研究与技术1999，，S1： | 0 |
| 8 | REGIONAL GEOLOGICAL ASPECTS CONCERNING SAFETY OF WATER STORAGE显示文摘Dams and, particulary,large dams are structures with a risk potential and impacts on the environment. The impacts not only concern the immediate project area and its vicinity, but often the whole catchment area and the downstream valley. This is why regional aspects are important during design, investigation and operation. Regional geology,including all relevant geo-sciences, provides basic information for a safe and longtime operation of a project. | Lutz KRAPP, HE Ying-chen, JIN Kan-kun, Paraskevas PANTZARTZIS (l. Technical University of Aachen, Germany 52080 2. Hebei Institute of Architectural Science & Technology, Handan, 056038 3. Dip. Geol., Da rer nat.,Greece) | 2000 | 河北建筑科技学院学报2000，17，1： | 0 |
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