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Search Results: 1 - 10 of 26917 matches for " Qingming Yi "
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A Perceptual Video Coding Based on JND Model  [PDF]
Qingming Yi, Wenhui Fan, Min Shi
Journal of Computer and Communications (JCC) , 2018, DOI: 10.4236/jcc.2018.64005
Abstract: In view of the fact that the current high efficiency video coding standard does not consider the characteristics of human vision, this paper proposes a perceptual video coding algorithm based on the just noticeable distortion model (JND). The adjusted JND model is combined into the transformation quantization process in high efficiency video coding (HEVC) to remove more visual redundancy and maintain compatibility. First of all, we design the JND model based on pixel domain and transform domain respectively, and the pixel domain model can give the JND threshold more intuitively on the pixel. The transform domain model introduces the contrast sensitive function into the model, making the threshold estimation more precise. Secondly, the proposed JND model is embedded in the HEVC video coding framework. For the transformation skip mode (TSM) in HEVC, we adopt the existing pixel domain called nonlinear additively model (NAMM). For the non-transformation skip mode (non-TSM) in HEVC, we use transform domain JND model to further reduce visual redundancy. The simulation results show that in the case of the same visual subjective quality, the algorithm can save more bitrates.
Construction of the Training Mode of the Combination of Clinical Medical Professional Degree Graduate Education and Resident Standardized Training  [PDF]
Jinjun Li, Qingming Wu, Ting Yu, Yi Zou, Yunjie Li
Creative Education (CE) , 2016, DOI: 10.4236/ce.2016.76082
Abstract: Beginning in 2014 as a major education reform in China, the implementation of clinical medicine specialized graduate student training combined with standardized resident training system as well as Chinese clinical medical professional degree system binding with the standardized training of residents becomes the highlight and difficulty of this medical educational reform. Through optimizing clinical medical professional degree graduate training scheme and innovative teaching mode and improving the management system, the specialized degree graduate students will be trained to be truly “Qualified doctor \"and high-level applied talents.
Preparation of KOH/CaO/C Supported Biodiesel Catalyst and Application Process  [PDF]
Jianwei Zhang, Qingming Meng
World Journal of Engineering and Technology (WJET) , 2014, DOI: 10.4236/wjet.2014.23020
Abstract: KOH/CaO/C supported catalyst was prepared via incipient wetness impregnation and used in synthesis of biodiesel. First, the effects of carrier/active components mass ratio, calcination temperature and calcination time on catalytic activity were investigated aiming at biodiesel yield, and the optimal process conditions for preparation of KOH/CaO/C catalysts were: mass ratio of C/CaO was 4:6; KOH solution (mass concentration) was 25%; impregnation time was 24 h; drying temperature was 105°C and time was 4 h; calcination temperature was 500°C and time was 5 h. Then the complex catalysts prepared under the optimal conditions were applied to synthesize biodiesel, and the effects of dose of catalyst, reaction temperature, and reaction time on the yield of biodiesel were investigated. At last, the optimal process conditions for synthesis of biodiesel were concluded: methanol-oil ratio was 10:1; catalyst dose was 2% of that of soybean oil; reaction temperature was 65°C; reaction time was 5 h. The yield of as-prepared biodiesel could be 98%.
Progress in Research on Nonalcoholic Fatty Liver and Gestational Diabetes  [PDF]
Zehua Luo, Qingming Wu
International Journal of Clinical Medicine (IJCM) , 2019, DOI: 10.4236/ijcm.2019.104019
Abstract: Although there is ample evidence that non-alcoholic fatty liver disease (NAFLD) is associated with impaired glucose homeostasis in the body, the clinical significance of NAFLD in pregnant women has not been established. Current studies have shown that women with NAFLD during early pregnancy have a significantly increased incidence of gestational diabetes mellitus (GDM) during pregnancy; whereas women with a history of GDM have a significantly increased probability of developing NAFLD in the future. Both may be a manifestation of an etiology in both systems, reflecting the impaired glucose homeostasis and the continuity of insulin resistance. For women with NAFLD found in early pregnancy, it is recommended to closely monitor blood glucose during pregnancy, and if necessary, early intervention to strengthen prenatal and postnatal care. The presence of GDM at a young age in women may be an early marker that helps to screen out women at higher risk of developing a disease before significant metabolic disease, and is of great significance in reducing associated morbidity and mortality.
Investigation on Test Anxiety and Coping Style of Middle School Students in Different Nationalities  [PDF]
Qiuyu Hu, Qingming Wu, Haiping Cheng
Creative Education (CE) , 2018, DOI: 10.4236/ce.2018.97080
Abstract: Background: To provide a theoretical basis for formulating effective measures to relieve test anxiety, we understand the current situation of examination anxiety and coping styles of middle school students from different ethnic groups. Methods: A stratified cluster random sampling survey was conducted on 251 junior middle school students in a middle school in Minhe County, Qinghai Province, using the middle school students’ test anxiety factors questionnaire (IFTAS) and the middle school students’ coping styles scale (CSS). Results: 1)Increasing the grades and ages, the score of different nationalities of middle school students’ test anxieties were higher(F = 4.795, P < 0.05; F = 2.468, P < 0.05); 2) The middle school students’ coping style ofpointing to the problem” had statistical significance among grades (F = 6.673, P < 0.05). 3)
Loop-mediated isothermal amplification: rapid detection of Angiostrongylus cantonensis infection in Pomacea canaliculata
Rui Chen, QunBo Tong, Yi Zhang, Di Lou, QingMing Kong, Shan Lv, MingMing Zhuo, LiYong Wen, ShaoHong Lu
Parasites & Vectors , 2011, DOI: 10.1186/1756-3305-4-204
Abstract: We used a loop-mediated isothermal amplification (LAMP) assay, which was performed using Bst DNA polymerase. Reactions amplified the A. cantonensis 18S rRNA gene and demonstrated high sensitivity; as little as 1 fg of DNA was detected in the samples. Furthermore, no cross-reactivity was found with other parasites such as Toxoplasma gondii, Plasmodium falciparum, Schistosoma japonicum, Clonorchis sinensis, Paragonimus westermani and Anisakis. Pomacea canaliculata snails were exposed to A. cantonensis first-stage larvae (L1) in the laboratory, and L3 were observed in the snails thirty-five days after infection. All nine samples were positive as determined by the LAMP assay for A. cantonensis, which was identified as positive by using PCR and microscopy, this demonstrates that LAMP is sensitive and effective for diagnosis.LAMP is an appropriate diagnostic method for the routine identification of A. cantonensis within its intermediate host snail P. canaliculata because of its simplicity, sensitivity, and specificity. It holds great promise as a useful monitoring tool for A. cantonensis in endemic regions.Angiostrongylus cantonensis can be found in the lungs and arteries of insectivores, rodents, canines and felines [1-6]. They are prevalent in the Pacific islands and Southeast Asia, and are the most common cause of eosinophilic meningitis in humans in areas where the parasite is endemic [7]. The definitive hosts of A. cantonensis are various species of rats. Modes of transmission of this parasite include ingestion of raw or undercooked snails and fresh leafy vegetables contaminated by infective third-stage larvae (L3) [8]. First-stage larvae (L1) of A. cantonensis grow to infective L3 in intermediate host snails. This disease is difficult to detect because of the long incubation period in patients and few diagnostic symptoms. Thus, in order to control A. cantonensis, efforts should be directed towards building a surveillance system for the intermediate host snails of th
Testing the Correlation and Heterogeneity for Hierarchical Nonlinear Mixed-Effects Models
Qingming Zou,Zhongyi Zhu
Advances in Decision Sciences , 2011, DOI: 10.1155/2011/976823
Abstract: Nonlinear mixed-effects models are very useful in analyzing repeated-measures data and have received a lot of attention in the field. It is of common interest to test for the correlation within clusters and the heterogeneity across different clusters. In this paper, we address these problems by proposing a class of score tests for the null hypothesis that all components of within- and between-subject variance are zeros in a kind of nonlinear mixed-effects model, and the asymptotic properties of the proposed tests are studied. The finite sample performance of this test is examined through simulation studies, and an illustrative example is presented. 1. Introduction Repeated-measures data are frequent observations in different areas of investigation, such as economics and pharmacokinetics. For instance, in longitudinal studies, observations on the same subject are usually made at different times. Analysis of such data requires accounting for the within-cluster correlation and the between-subject heterogeneity of the data. Random-effects models are commonly used for analyzing clustered and repeated-measures data. It is of no doubt that the linear mixed-effects models play an important role in evaluating and analyzing the repeated-measures and clustered data. For an example, see Laird and Ware [1]. However, many repeated-measures data, such as growth data, dose-response and pharmacokinetics data, are inherently nonlinear with respect to a given response regression function. Several different nonlinear mixed-effects model and various inference procedures have been proposed [2–5]. For models considered in these literatures, one of the interesting issues is whether there exists correlation within clusters or/and heterogeneity between subjects. It is well known that the misspecification of model can have serious impact on statistical inference. In regression model, two of the common assumptions are that of homogeneity and independence; the violation of these two assumptions can have adverse consequence for the efficiency of the estimators. So it is important to check these two assumptions whenever possible. For repeated-measures data and cluster data, if one can identify that there are no heterogeneity and correlation, which are caused by random effects, then a simple model can be used to fit the data and the efficient statistical inference can be obtained. However, if there are heterogeneity and correlation among outcomes and one does not identify their existence, then the overestimate or underestimate will be obtained for the parameters in model, and the
Triggering one dimensional phase transition with defects at the graphene zigzag edge
Qingming Deng,Jiong Zhao
Physics , 2015,
Abstract: One well-known argument about one dimensional(1D) system is that 1D phase transition at finite temperature cannot exist, despite this concept depends on conditions such as range of interaction, external fields and periodicity. Therefore 1D systems usually have random fluctuations with intrinsic domain walls arising which naturally bring disorder during transition. Herein we introduce a real 1D system in which artificially created defects can induce a well-defined 1D phase transition. The dynamics of structural reconstructions at graphene zigzag edges are examined by in situ aberration corrected transmission electron microscopy (ACTEM). Combined with an in-depth analysis by ab-initio simulations and quantum chemical molecular dynamics (QM/MD), the complete defect induced 1D phase transition dynamics at graphene zigzag edge is clearly demonstrated and understood on the atomic scale. Further, following this phase transition scheme, graphene nanoribbons (GNR) with different edge symmetries can be fabricated, and according to our electronic structure and quantum transport calculations, a metal-insulator-semiconductor transition for ultrathin GNRs is proposed.
Relationship between Fatty Liver and Pancreatitis  [PDF]
Jing Jia, Qingming Wu, Jiguang Kou, Ming Yang
International Journal of Clinical Medicine (IJCM) , 2018, DOI: 10.4236/ijcm.2018.94021
Abstract: Objective: We aim to explore the relationship between fatty liver and the severity of acute pancreatitis. Methods: The data of 128 patients with acute pancreatitis in the Xiaogan Central Hospital of Hubei from October 2016 to October 2017 were retrospectively analyzed. Clinical data of patients with fatty liver and non-fatty liver were statistically analyzed, the CT value of the liver and spleen was measure, and fatty liver was defined as mean L/SCT value < 1. Results: Among 128 patients, fatty liver was found in 56 (43.8%) and nonfatty liver in 72 (56.2%). Compared with patients with non fatty liver disease, the severity of pancreatitis, blood triglyceride and C reactive protein levels were higher in fatty liver patients, higher proportion of patients with local complications and persistent organ failure. Conclusion: Fatty liver has a greater impact on the severity of acute pancreatitis. It is possible to be an indicator of the severity of acute pancreatitis.
Progress in Endoscopic Treatment of Upper Gastrointestinal Bleeding  [PDF]
Qinghai Fu, Qingming Wu, Jiguang Kou, Jinjun Li
International Journal of Clinical Medicine (IJCM) , 2018, DOI: 10.4236/ijcm.2018.94020
Abstract: Due to the increase in the incidence of upper gastrointestinal bleeding, the treatment methods are more and more diversified. With the popularization of endoscopic techniques and the wide range of endoscopic hemostasis methods, endoscopy has become an important method for the treatment of upper gastrointestinal bleeding, and greatly updated the treatment concept of upper gastrointestinal bleeding. In this paper, we reviewed the literature reports of endoscopic treatment of upper gastrointestinal bleeding in recent years.
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