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Particuology 2012年第6期10卷 672-682页

作者： R.Baleviius I.Sielamowicz Z.mróz R.Kaianauskas Department of Reinforced Concrete and Masonry Structures Vilnius Gediminas Technical Universityav.Sauletekio 11LT-10223 VilniusLithuania Composite Silo Systems ORCHIDEA st.J.Matejki 815-196 BialystokPoland Institute of Fundamental Technological Research Polish Academy of Sciencesst.Pawin'skiego 5b02-106 WarsawPoland Institute of Mechanics Vilnius Gediminas Technical Universityst.J.Basanaviiaus.28LT-10223 VilniusLithuania

The present paper provides both experimental and DEM analyses of the filling and discharge of pea grains from a 3D flat-bottomed bin. In the DEM model, the fixed mean values of the experimentally determined single particle data, such as the particle density, Young＇s modulus, Poisson＇s ratio as well as the sliding and rolling friction coefficients were incorporated to analyse their effects on the macroscale indicators, such as the wall pressure, discharge velocities and material outflow parameters. The effect of rolling friction was studied based on the experimentally measured single particle rolling friction coefficient. This analysis is aimed at the quantitative prediction of flow parameters as related to the identification of material parameters.

关键词： Visco-elastic granular materia Discrete element method Rolling friction Wall pressure Material velocityOutflow mass Outflow rateBiosystems Pea grains

Facial Expression Recognition Based on Deep Learning

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Facial Expression Recognition Based on Deep Learning

作者： PHAENGKHAMME NA mr. 湖南大学

学位级别：硕士

如今有着快速发展趋势的人工智能与计算机视觉技术让人们对人机交互领域的人脸识别方向更加关注。要让计算机准确地识别人脸的不同面部表情是一项充满挑战和困难的任务,由于人类的不同表情的差异并不明显。利用计算机来分析人的面部表情... 详细信息

如今有着快速发展趋势的人工智能与计算机视觉技术让人们对人机交互领域的人脸识别方向更加关注。要让计算机准确地识别人脸的不同面部表情是一项充满挑战和困难的任务,由于人类的不同表情的差异并不明显。利用计算机来分析人的面部表情,进而识别出人的真实情绪就是我们所说的人脸表情识别,这一方向的研究有很高的应用价值。不需要过高的计算机性能,但识别率不高的方法就是传统的人脸表情识别方法,它使用研究人员设计的特征来判别表情。脸部信息可以通过非接触的方式(如摄像头拍摄)获得,人最重要的外貌特征之一就是人脸,故身份识别的相关依据在很多时候都是依靠人脸。人脸识别的过程首先是在输入的视频或是图像中进行判断寻找人脸是否存在。倘若人脸出现在输入中,则进一步将所有人脸信息记录,详细来说就是记录人脸的大小、主要面部器官的位置和其他特征,而后从获取到的信息中分析输入的人脸代表的身份特征。如此一来就可以和已有人脸数据库中的信息进行对比,进行判断和识别相关人员信息。作为一个交叉学科,计算机视觉、模式识别、计算机图形学、图像处理、生理学、心理学和认知科学等都被人脸识别方向的研究内容涉及。在公安、司法和国家安全、军事安全、民政、金融、民航、海关、边境及保险等民用领域实际应用中人脸识别技术都具有极广阔的前景。此外,人脸识别技术的方法也有多种,可采用非接触式的、连续的和实时的方式进行采集实现。经过多年的应用和发展,人脸识别技术的应用层面一直在拓展,其识别效果一直在精进,在控制了一些限制条件的情况下可以取得不错的识别效果。但就目前而言,人脸识别技术与人类自身的识别能力相比较是难以望其项背的。其部分原因有:二维人脸图像的采集源头很大程度来自于摄像头,而摄像头的采集受到人的姿态和摄像头角度、光线强度等诸多因素的影响,这些因素导致即使是采集同一个人的人脸信息也会有很大的差异。换句话而言,受到表情、附属物等诸多因素影响的三维人脸模型,其本身就是高度非刚性的模型,而这些不确定因素严重地影响着人脸识别系统。详细讨论一下影响人脸识别结果的不确定因素:(1)表情。人脸面部器官的位置的改变往往由表情的变化引起。人在高兴时通常会张大嘴巴,同时让脸颊微微抬起;人在悲伤时通常会让眉毛皱在一起,同时嘴角下拉;人在惊奇时通常会将眉毛抬起、睁大眼睛,同时把嘴巴张开。(2)附属物。有些额外的附属物件会对人脸识别造成困难,比如说一些佩戴物(如眼镜、口罩、帽子等),这些东西会对面部的特征造成遮挡导致识别结果的偏离。具体而言,如果需要进行人眼定位,捕获一个戴眼镜的人的眼球位置就十分困难;而更难处理的情况是,捕获戴口罩的人们的面部特征。此外,发型、胡须以及化妆等众多因素也影响人脸面部特征的记录。(3)姿态。采集到的人脸信息在同一个人的不同形态下会有较大差异。我们目前认为当一个人处于采集器的正面位置时,收集的信息越精准。而随着人的姿态的变化,信息收集的效果也会有很大的波动。当前人脸识别领域难以处理的问题之一就是人的姿态变化影响信息收集。(4)光线强度。采集到的人脸图像的灰度值大小会由于不同环境光线强度而剧烈变化。“阴阳脸”的问题会出现在人脸在偏光、侧光照射的情况下。采集到的人脸图像灰度分布变化加剧很多时候是由于在复杂光照下,人脸光照不均,这极大地影响了人脸识别的效果。本文进行人脸表情识别的研究使用得是深度学习的方法。对于上述提到的问题,本文基于现有深度学习算法对面部表情识别进行了研究,主要内容如下:1)介绍了人脸表情识别理论与技术。面部表情分类和面部表情的特征提取方法是相辅相成的关系,分类识别的好坏取决于表情的特征提取,通过定义不同的类别,规定好相应的分类规则对面部表情进行识别分类。本文主要介绍了人脸表情识别理论与技术,包括图像预处理技术、图像表情特征处理、面部表情识别技术三个部分。本文详细地介绍了对人脸表情图像的预处理中所用到的相关算法。在对人脸表情图像进行合适的裁剪之前,通过对应的算法来检测人脸部位的信息。尺寸归一化和灰度归一化处理所有的图像信息。双线性插值法被使用在图像尺度归一化中。为了去除对表情造成干扰的信息,更真实地反映原来图像的信息,本文通过对人脸面部表情图像进行缩小和放大实现。将给定图像的直方图的分布形式变得较为均匀且符合图像灰度归一化的灰度直方图均衡化方法,本文对图像的方差进行规范化后,再进行图像预处理,使得两者的轮廓更加清渐、光滑。从而达到减少甚至消除光线强度等干扰因素带来的影响,但是在阴阳脸这类情况中无法取得较好的效果。本文的预处理结果会在后期的表情分类的实现中起到良好的基础作用。在面部表情特征提取方法部分,介绍了贝叶斯网络、KNN分类算法、支持向量机。此外,本文还详细介绍了深度学习理论中基于全局的特征提取、局部特征提取。2)表情识别方法。首先讨论了训练样本的采集,主要是对于样本的采集做了详细的讨论

关键词：人脸表情识别深度学习 AffectNet 图像处理

Genetic diversity of HCV among various high risk populations(IDAs,thalassemia,hemophilia,HD patients) in Iran

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Asian Pacific Journal of Tropical Medicine 2013年第7期6卷 556-560页

作者： Rafiei A Darzyani Azizi M Taheri S Haghshenas mr Hosseinian A Makhlough A Molecular and Cell Biology Research Center.Faculty of Medicine Mazandaran University of Medical Sciences18KM Khazar BlvdKhazar Sq.SariIran Department of Internal Medicine Faculty of MedicineMazandaran University of Medical SciencesSari.Iran Nephrology Ward Department of Internal MedicineFaculty of MedicineMazandaran University of Medical SciencesSari.Iran

Objective:To determine the patterns of distribution of HCV genotypes among high risk population in north of ***:A cross-sectional study was conducted on 135 HCV RNA-positive high risk individuals including thalassemia,hemophilia,patients under hemodialysis and intravenous drug *** genotypes were determined based on amplification with type-specific primers ***:Among the 187 anti-HCV positive samples,only 135 (72.2%)gave HCV-RNA *** all,the most identified HCV type was genotype 3a(51.1%) followed by 1a(27.4%),1b(8.2%).Sixteen(11.9%)out of 135 HCV RNA-positive participants have infected with more than one genotype or subtypes as follow:1a/1b in 11(8.2%),2/3a in 3 (2.2%),and 1a/1b/3a in 2(1.5%).Stratification of participants revealed that HCV subtype 3a was more prominent in thalassemia,hemophilia and HD patients but 1a and 1b were frequent in intravenous drug ***:This study is the first report on HCV genotypes among Iranian subjects with different exposure categories resided in *** genotype 3a was found to be the most frequent genotype in thalassemia,hemophilia,and hemodialysis patients but not in *** the addiction age is decreasing in Iran and a lot of addicts are *** might change the subtype pattern of HCV in general population.

关键词： HCV Thalassemia Hemophilia Hemodialysis Intravenous drug addicts Iran

SPEECH AT THE PRESS CONFERENCE OF THE INTERNATIONAL CONFERENCE AND EXHIBITION ON PETROLEUM REFINING AND PETROcheMICAL PROCESSING

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石油学报(石油加工) 1990年第3期 4-6页

作者： mr.chen Jinhua President of SINOPEC

Honored ladies and gentlemen,comrades: Today,July 12,1990,is the seventh anniversary of the founding of the China Petrochemieal Gorporation.I have the privilege and honor to inform you

关键词： SPEECH AT THE PRESS CONFERENCE OF THE INTERNATIONAL CONFERENCE AND EXHIBITION ON PETROLEUM REFINING AND PETROcheMICAL PROCESSING AT

Speech by mr. Tang Jiaxuan, State Councilor of China, at the Opening Ceremony of the 13th Annual Workshop of the Framework on Regional Cooperation for the Promotion and Protection of Human Rights in the Asia-Pacific Region

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The Journal of Human Rights 2005年第6期4卷 7-8页

作者： mr. Tang Jiaxuan, State Councilor of China.

Immunohistochemical analysis of p53,cyclinD1,RB1,c-fos and N-ras gene expression in hepatocellular carcinoma in Iran

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World Journal of Gastroenterology 2007年第4期13卷 588-593页

作者： SJ Moghaddam EN Haghighi S Samiee N Shahid AR Keramati S Dadgar mr Zali Research Center for Gastroenterology and Liver Disease Shaheed Beheshti University of Medical Sciences and Academy of Medical Sciences Iran

AIM： TO study the effect of some genes especially those involved in cell cycle regulation on hepatocellular carcinoma. METHODS： Paraffin-embedded tissue samples of 25 patients （18 males and 7 females） with hepatocellular carcinoma were collected from 22 pathology centers in Tehran during 2000-2001, and stained using immunohistochemistry method （avidin-biotin-peroxidase） for detection of p53, cyclinD1, RB1, c-los and N-ras proteins. RESULTS： Six （24%）, 5 （20%）, 12 （48%） and 2 samples （8%） were positive for p53, cyclinDl, C-los and N-ras expression, respectively. Twenty-two （88%） samples had alterations in the （31 cell-cycle checkpoint protein expression （RBI or cyclinD1）. P53 positive samples showed a higher （9 times） risk of being positive for RBI protein than p53 negative samples. Loss of expression of RBI in association with p53 over-expression was observed in 4 （66.7%） of 6 samples. Loss of expression of RBI was seen in all cyclinD1 positive, 20 （90.9%） N-ras negative, and ii （50%） C-fos positive samples, respectively. CyclinD1 positive samples showed a higher （2.85 and 4.75 times） risk of being positive for c-los and N-ras expression than cyclinD1 negative samples. CONCLUSION： The expression of p53, RB1 and c-los genes appears to have a key role in the pathogenesis of hepatocellular carcinoma in Iran. Simultaneous overexpression of these genes is significantly associated with their loss of expression during development of hepatocellular carcinoma.

关键词： Hepatocellular Carcinoma Iran Expressionof p53, cyclinD1, RB1, c-fos and N-ras genes

Prognostic value of dynamic electroencephalogram in comatose patients with different diseased regions

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Neural Regeneration Research 2007年第7期2卷 421-424页

作者： Huapin Huang Chunhui che An Zheng Xiaoyun Zhuang Fang Jiang Nan Liu Department of Neurology Union Hospital of Fujian Medical University Fuzhou 350001 Fujian Province China

BACKGROUND： It has proved that dynamic electroencephalogram （EEG） is definite in judging the outcome of ischemic hypoxic comatose patients, EEG is more sensitive to the cortical affection, but not sensitive to the subcortical and brainstem affections, thus it is necessary to clarify the indications of this technique in the clinical application.OBJECTIVE： To observe and compare the prognostic value of dynamic EEG and Glasgow coma score in comatose patients with different diseased region.DESIGN： A clinical case-controlled observation.SETTING： Union Hospital of Fujian Medical University.PARTICIPANTS： Sixty-eight comatose patients were selected from the Union Hospital affiliated to Fujian Medical University from June 1998 to January 2005. The diseased regions were identified using cranial CT （n =43） or mr （n =25）. According to different primarily diseased regions, the comatose patients were divided into two groups： ① brainstem affection group （n =23）： 13 males and 10 females, 14 - 62 years of age; ②diffuse cortical affection group （n =45）： 28 males and 17 females, 23 - 75 years of age.METHODS： The dynamic EEG and Glasgow coma score were examined in the 45 comatose patients with primarily cortical affection and 22 comatose patients with primarily brainstem affection at acute phase. The patients were followed-up for 3 months to observe the outcome, The termination of outcome judgment was 3 months after attack or the death. The clinical outcome was classified as complete rehabilitation, survived with disability, death or vegetative state. Correlations of dynamic EEG and Glasgow coma score with the outcome of patients were analyzed. The correlations of dynamic EEG grades and Glasgow coma scores with the outcome were analyzed, and the prognostic value of dynamic EEG grades was compared between the two groups.MAIN OUTCOME MEASURES： ① Correlations of dynamic EEG and Glasgow coma score with the outcome of patients; ② Comparison of the prognostic value of dynamic EEG

关键词： dynamic electroencephalogram brainstem infarction coma outcome cerebral cortex

Biotechnological preparation of chicken skin gelatine using factorial design of experiments

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Food Bioscience 2022年第3期47卷 898-907页

作者： Petr mrázek Robert Gál Pavel Mokrejš Jana Orsavová Dagmar Janáčová Tomas Bata University in Zlín Department of Polymer EngineeringVavrečkova 275760 01ZlínCzech Republic Tomas Bata University in Zlín Department of Food TechnologyMostní 5139760 01ZlínCzech Republic Tomas Bata University in Zlín Language CentreŠtefánikova 5670760 01ZlínCzech Republic Tomas Bata University in Zlín Department of Automation and Control EngineeringNad Stráněmi 4511760 01ZlínCzech Republic

Poultry meat production steadily increases and its by-products including legs or skins may be further utilized to prepare gelatine,generally by using alkali or acid *** they are toxic,different methods are desirable,*** proteolytic *** enzymes is beneficial as they shorten processing time and reduce the required water *** conditions(the enzyme amount during the pre-treatment,first and second extraction temperature and time)of the process may influence gelatine quality and its *** this study,gelatines were prepared from chicken skin at different conditions in the series of combined factorial design of *** significance of the influence of the conditions on the quality(gel strength,viscosity,melting and gelling point)and yield of chicken skin gelatine(CSG)was *** highest yield(31.5%)was obtained at the conditions of the enzyme amount of 0.8%,first extraction temperature 80℃ and time 30 min,second extraction temperature 90℃ and time 60 ***,the highest CSG quality of gel strength(190 Bloom),viscosity(4.06 mPas),melting point(38.3℃)and gelling point(20.5℃)was obtained at the conditions of 0.2%/50℃/30 min in the first extraction.

关键词： Collagen Chicken skin Enzyme pre-treatment Gelatine Gelling properties

Neutron-irradiated Si by positron annihilation

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Chinese Science Bulletin 1997年第1期42卷 26-30页

作者： Huang, mr Wang, YY Yang, JH He, YS Guo, YH Liu, CC Institute of High Energy Physics Chines Academy of Sciences Beijing China Research Laboratory of Semiconductors Hebei Technological College Tianjing China

SILICON is a quite important material in the application of energy resources technology. With the development of ion-implantation technique and the increasing interest in dopping, it is very important to know the relationship between the vacacies induced by the particle irradiation damage and the annealing temperature. The positron annihilation is a very useful method for studying defects in the semiconductor, because the annihilation characteristics of trapped positron are influenced by the charge of the defects. It has been shown that the positrons can be trapped by defects created by irradi-

关键词： neutron-irradiated Si positron annihilation vacancy.

Cologne, Creating the Future

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技术经济与管理研究 1998年第6期 9-10页

作者： mr.Norbert Burger(Lord Mayorof Cologne)