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Search Results: 1 - 10 of 35932 matches for " Jia Hua "
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Fuzzy Timed Agent Based Petri Nets for Modeling Cooperative Multi-Robot Systems  [PDF]
Xingli HUANG, Hua XU, Peifa JIA
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2009, DOI: 10.4236/ijcns.2009.29096
Abstract: A cooperative multi-robot system (CMRS) modeling method called fuzzy timed agent based Petri nets (FTAPN) is proposed in this paper, which has been extended from fuzzy timed object-oriented Petri net (FTOPN). The proposed FTAPN can be used to model and illustrate both the structural and dynamic aspects of CMRS, which is a typical multi-agent system (MAS). At the same time, supervised learning is supported in FTAPN. As a special type of high-level object, agent is introduced into FTAPN, which is used as a common modeling object in its model. The proposed FTAPN can not only be used to model CMRS and represent system aging effect, but also be refined into the object-oriented implementation easily. At the same time, it can also be regarded as a conceptual and practical artificial intelligence (AI) tool for multi-agent systems (MAS) into the mainstream practice of the software development.
4,4′-(Propane-1,3-diyl)dibenzoic acid
Jia Hua,Lu Gao
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809033005
Abstract: The complete molecule of the title compound, C17H16O4, is generated by crystallographic twofold symmetry, with the central C atom lying on the rotation axis and a dihedral angle between the benzene rings of 81.9 (2)°. In the crystal, molecules are linked by O—H...O hydrogen bonding between carboxyl groups, forming one-dimensional supramolecular chains.
Molecular Cloning, Characterization, and Expression Analysis of the CXCR4 Gene from Turbot: Scophthalmus maximus
Airong Jia,Xiao-Hua Zhang
Journal of Biomedicine and Biotechnology , 2009, DOI: 10.1155/2009/767893
Abstract: Chemokine receptor 4 (CXCR4) belongs to the large superfamily of G protein-coupled receptors. The EST sequence of CXCR4 from turbot (Scophthalmus maximus L.) was obtained from a subtractive cDNA library. In the present study, the full-length cDNA sequence of turbot CXCR4 was obtained, and sequence analysis indicated that its primary structure was highly similar to CXCR4 from other vertebrates. Quantitative real-time PCR demonstrated that the highest expression level of turbot CXCR4 was in the spleen following injection with physiological saline (PS). After turbot were challenged with Vibrio harveyi, the lowest expression level of CXCR4 was detected at 8 hours in the spleen and 12 hours in the head kidney, and then increased gradually to 36 hours. These findings suggested that CXCR4 may play a significant role in the immune response of turbot.
Flexion Relaxation and Its Relation to Pain and Function over the Duration of a Back Pain Episode
Raymond W. McGorry, Jia-Hua Lin
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0039207
Abstract: Background Relaxation of the erector spinae often occurs in healthy individuals as full trunk flexion is achieved when bending forward from standing. This phenomenon, referred to as flexion relaxation is often absent or disrupted (EMG activity persists) in individuals reporting low back pain (LBP). Methods and Results Self-reported pain and disability scores were compared to EMG measures related to the flexion relaxation (FR) phenomenon by 33 participants with LBP at up to eight sessions over a study period of up to eight weeks. Fourteen participants served as a control group. In the protocol, starting from standing participants bent forward to a fully flexed posture, and then extended the trunk to return to standing position. A thoracic inclinometer was used to measure trunk posture. Surface electrodes located at the L2 and L5 levels recorded EMG amplitudes of the erector spinae. Ratios of EMG amplitudes recorded during forward bending to amplitudes at full flexion, and ratios of extension to full flexion were calculated. EMG amplitudes and their ratios were compared between control and LBP groups at the initial visit. No significant differences between groups were found except at the L5 location at full flexion. Correlations of the ratios to pain and function scores recorded in repeated sessions over the LBP episode also were compared between LBP group participants classified as having transient, recurrent or chronic symptoms. In another analysis participants were grouped by whether their symptoms resolved over the study period. Conclusions The transient LBP group had significantly stronger correlations between pain and function to both ratios, than did those with more chronic LBP symptoms. Participants who experienced symptom resolution generally had stronger correlations of ratios to both pain and function than those with partial or no resolution. Improved understanding of these relationships may provide insight in clinical management of LBP.
A Minimized Wideband Antenna Array with Decoupling Networks for UHF RFID Applications
Tianyu Jia;Hua Zhu;Xiuping Li
PIER C , 2013, DOI: 10.2528/PIERC12111802
Abstract: A minimized wideband antenna array is presented for ultra-high frequency (UHF) radio frequency identification (RFID) reader applications. The antenna array consists of two E-shaped patch antennas and a feeding network, with the overall size 200×100×20 mm. The feeding network could effectively decrease the antenna mutual coupling and improve the bandwidth. The measured bandwidth is about 68 MHz (896-964 MHz) under the condition of voltage standing wave ratio (VSWR) less than 2, which covers various RFID bands including North American (902-928 MHz), partial Chinese (920-925 MHz) and Japanese (952-955 MHz). The average gain is 4.5 dBi in UHF band. The principles of the antenna and the feeding network are also discussed and analyzed in this paper. At last, the key parameters are studied and show the antenna robustness.
Bis(4-amino-3,5-di-2-pyridyl-1,2,4-triazole-κ2N1,N5)diaquazinc(II) dinitrate
Jia Hua,Lu Gao,Baiyan Li
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809032103
Abstract: The asymmetric unit of the title compound, [Zn(C12H10N6)2(H2O)2](NO3)2, contains one-half of the complex molecule and one NO3 anion. The ZnII ion displays a distorted tetragonal-pyramidal geometry with four N atoms from two chelating 4-amino-3,5-di-2-pyridyl-1,2,4-triazole (2-bpt) ligands in the basal plane and one water molecule occupying the apical site. Another water molecule at the opposite of the apical site has a weak interaction with the ZnII ion [Zn—O = 2.852 (5) ]. The ZnII ion and the two water molecules lie on a twofold rotation axis. An extensive system of hydrogen bonds involving the NH2 groups of the 2-bpt ligands, water molecules and nitrate anions links all residues into a three-dimensional network.
The Association between Walking and Perceived Environment in Chinese Community Residents: A Cross-Sectional Study
Yingnan Jia, Tricia Usagawa, Hua Fu
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0090078
Abstract: Background The neighborhood environment, as a determinant of walking, has been assessed in several developed countries. However, few studies have investigated these associations in Chinese populations. Objective To examine the association between the perceived neighborhood environment and walking for recreation or transportation purposes among Chinese community residents. Methods We used a multi-stage stratified random sampling design to conduct a cross-sectional study of 1528 Chinese adults in Shanghai. Environmental and walking variables were assessed using a revised Abbreviated Neighborhood Environment Walkability Scale for Chinese subjects and a long version of International Physical Activity Questionnaire. Self-reported demographic variables including gender, age, employment status, and location of community were also collected. Multiple logistic regression analysis was applied to examine the association between the neighborhood environment and walking. Results Based on the results of IPAQ, 13.7% of the overall subjects were physical inactive, which was considered to be lowly active. For all participants, accessibility to services was significantly associated with walking for both recreation and transportation (odds ratio = 1.062, 95% confidence interval: 1.016, 1.110; odds ratio = 1.053; 95% confidence interval: 1.008, 1.100, respectively). In males, accessibility to services was significantly associated both with walking for recreation and walking for transportation. However, a significantly negative association was found between the neighborhood surroundings and walking for recreation. In contrast, females who perceived good traffic safety tended to walk for recreation. Data also revealed a difference between working and retired individuals. Among working participants, perceived environmental variables were not significantly associated with walking for recreation and transportation. Conclusions The association between neighborhood environment and walking varied depending on the reason for walking and the characteristics of the participants. Our findings suggest that interventions to promote walking in community residents should include improving the neighborhood environment, particularly accessibility to services such as building more stores, parks, and public transit facilities.
Study of daily solar Irradiance forecast based on chaos optimization neural networks  [PDF]
Shuang-Hua Cao, Jian-Bo Chen, Wen-Bing Weng, Jia-Cong Cao
Natural Science (NS) , 2009, DOI: 10.4236/ns.2009.11006
Abstract: In this works, artificial neural network is com-bined with wavelet analysis for the forecast of solar irradiance. This method is characteristic of the preprocessing of sample data using wavelet transformation for the forecast, i.e., the data se-quence of solar irradiance as the sample is first mapped into several time-frequency domains, and then a chaos optimization neural network is established for each domain. The forecasted so-lar irradiance is exactly the algebraic sum of all the forecasted components obtained by the re-spective networks, which correspond respec-tively the time-frequency domains. On the basis of combination of chaos optimization neural network and wavelet analysis, a model is devel-oped for more accurate forecasts of solar irradi-ance. An example of the forecast of daily solar irradiance is presented in the paper, the historical daily records of solar irradiance in Shanghai constituting the data sample. The results of the example show that the accuracy of the method is more satisfacto
CDV Index: A Validity Index for Better Clustering Quality Measurement  [PDF]
Jian-Hua Yeh, Fei-Jie Joung, Jia-Chi Lin
Journal of Computer and Communications (JCC) , 2014, DOI: 10.4236/jcc.2014.24022

In this paper, a cluster validity index called CDV index is presented. The CDV index is capable of providing a quality measurement for the goodness of a clustering result for a data set. The CDV index is composed of three major factors, including a statistically calculated external diameter factor, a restorer factor to reduce the effect of data dimension, and a number of clusters related punishment factor. With the calculation of the product of the three factors under various number of clusters settings, the best clustering result for some number of clusters setting is able to be found by searching for the minimum value of CDV curve. In the empirical experiments presented in this research, K-Means clustering method is chosen for its simplicity and execution speed. For the presentation of the effectiveness and superiority of the CDV index in the experiments, several traditional cluster validity indexes were implemented as the control group of experiments, including DI, DBI, ADI, and the most effective PBM index in recent years. The data sets of the experiments are also carefully selected to justify the generalization of CDV index, including three real world data sets and three artificial data sets which are the simulation of real world data distribution. These data sets are all tested to present the superior features of CDV index.

Antioxidant Capacities and Main Reducing Substance Contents in 110 Fruits and Vegetables Eaten in China  [PDF]
Changjin Liu, Yanli Zhao, Xiaojing Li, Jianying Jia, Yanya Chen, Zetian Hua
Food and Nutrition Sciences (FNS) , 2014, DOI: 10.4236/fns.2014.54036

The aim of this study was to screen strongly-antioxidant fruits and vegetables and supply practical diet guidance for the public. We used 1,1-diphenyl-2-picrylhydrazyl (DPPH), ferric-reducing antioxidant potential (FRAP), 2,2’-azino-bis-3-ethylbenzthiazoline-6-sulphonic acid (ABTS) and total reducing power (TRP) assays to investigate antioxidant activities in 110 fruits and vegetables. To analyze the correlation between antioxidant capacities and main reducing substance contents, total phenolic, flavonoid and vitamin C contents were assessed. The results showed great variation in antioxidant activity, and fifteen fruits and vegetables possessed the strongest antioxidant capacities: Toona sinensis, hawthorn, jujube, lotus root, persimmon, red plum, black plum, chilli pepper, star fruit, strawberry, blueberry, cherry, peach, pomegranate and great burdock. Total phenolic contents showed higher correlation with antioxidant capacity when using FRAP and TRP assays than when using the DPPH or ABTS assay. Phenolics and flavonoids, rather than vitamin C, contributed to antioxidant potential in most fruits and vegetables.

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