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Search Results: 1 - 10 of 6467 matches for " Chengying Mao "
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A Heuristic Algorithm for Bipartite Community Detection in Social Networks
Chengying Mao
Journal of Software , 2012, DOI: 10.4304/jsw.7.1.204-211
Abstract: Analysis on topological characteristics of the network, such as the vertex degree distribution, centrality and community structure, provides valuable insight into the structure and function of the interacting data entities. Community detection is one of the key problems in the field of social network analysis. In the paper, we mainly focus on the two-part division problem for network, i.e., community (or graph) partitioning. Based on the in-depth analysis on the community features of some known partitioning results, a three-stage heuristic algorithm named 3SHP is proposed. At first, two pseudo-centers are identified according to the clue of the diameter path in a network. Then, two heuristic strategies, i.e. the shortest path cutting (SPC) and two-point diffusing (TPD), are introduced to divide the whole network into three parts: two rudimental communities and a set of undecided nodes. Subsequently, an experience rule is used to classify such undecided nodes to produce two final communities. The experiment results show that the 3SHP algorithm is effective, able to yield the best partitioning results in most instances.
Control Flow Complexity Metrics for Petri Net-based Web Service Composition
Chengying Mao
Journal of Software , 2010, DOI: 10.4304/jsw.5.11.1292-1299
Abstract: Web services technology is an effort to build a distributed computing platform over the network, and it can implement systematic application-to-application interaction on the Web. In recent years, this new technology has been widely adopted for constructing distributed applications. However, how to precisely measure the controlling complexity of Web service composition (WSC) is a very difficult task due to its characters such as heterogeneity, distributed and loose-coupling. In the paper, we mainly concern on the complexity measurement of Petri net-based business process in Web service composition. Two metric sets are presented through analyzing the WSC’s execution logics and dependency relations in workflow. The first one is count-based metric set, and includes seven metrics such as number of place, average degree of transition, transfer number per service and cyclomatic complexity. The second is an execution path-based metric set, which includes average execution path complexity (AEPC) and its extension based on cognitive informatics. In addition, two real-world WSCs are used to validate our measurement methods. The results show that our metrics are effective and rational, and have high practical value for WSC analysis and maintenance.
A Quantitative Assessment Approach to COTS Component Security
Jinfu Chen,Yansheng Lu,Huanhuan Wang,Chengying Mao
Mathematical Problems in Engineering , 2013, DOI: 10.1155/2013/165029
Abstract:
Experimental study of operation performance of a low power thermoelectric cooling dehumidifier
Wang Huajun, Qi Chengying
International Journal of Energy and Environment , 2010,
Abstract: The present work was performed to apply thermoelectric technology to a low power dehumidifying device as an alternative to the conventional vapor-compression refrigeration systems. The experimental prototype of a small-scale thermoelectric dehumidifier (TED) with rectangular cooling fins was built and its operation performance was studied experimentally. The results showed that the TED experienced two typical thermodynamic processes including the cooling dehumidification and the isothermal dehumidification, where the latter was dominated. It was found that there existed a peak during the variation of the average coefficient of performance (COP) as a function of the input power of the thermoelectric module. Under the present experimental conditions, the COP of the TED reached the maximum of 0.32 and the corresponding dehumidifying rate was 0.0097 g/min, when the input power was kept at 6.0 W. The rapid elimination of condensed liquid-drops on the cooling fins amounted on the thermoelectric module is a major approach to improving the operation performance of the TED.
Carrier envelope phase dynamics of cavity solitons: soliton stability and scaling law
Chengying Bao,Changxi Yang
Physics , 2015,
Abstract: The relationship between carrier envelope phase (CEP) slip of cavity soliton (CS) and pump phase detuning is derived analytically and numerically. To preserve the stability of CS, CEP slip always equals to the pump phase detuning. When CEP slip fails to follow the pump phase detuning, CS becomes unstable. The locking between CEP slip and pump phase detuning results in a scaling law for CS.
Site-directed mutagenesis reveals new and essential elements for iron-coordination of the sulfur oxygenase reductase from the acidothermophilic Acidianus tengchongensis
ZhiWei Chen,ChengYing Jiang,ShuangJiang Liu
Chinese Science Bulletin , 2009, DOI: 10.1007/s11434-009-0060-3
Abstract: Previous study on refolding of sulfur oxygenase reductase (SOR) inclusion bodies from recombinant Escherichia coli showed that iron was critical to the activity of the SOR from Acidianus ambivalens. In this study, enzymatic assays showed that 2,2′-Dipyridyl, Tiron and 8-hydroxyquinoline, which are specific for chelating ferrous or ferric ions, strongly inhibited the activity of SOR from A. tengchongensis, suggesting that iron atom is essential for SOR activity. Alignment of several functionally identified SORs and SOR-like sequences from genome database revealed a conserved, putative iron binding motif, H86-X3-H90-X n -E114-X n -E129 (numbering according to the Acidianus tengchongensis SOR sequence). Three mutants of SOR were generated by site-directed mutagenesis of H86, H90 and E129 into phenylalanine or alanine residue in this study. Circular dichroism spectrum determination indicated that there was no change of the secondary structures of mutant SORs, H86F, H90F and E129A, but all mutants were completely inactive. Through determination of iron contents we found that SOR mutants of H86F, H90F and E129A completely or partially lost iron, while mutants of C31S, C101S, and C104S (generated in a previous study) did not. This result indicated that H86, H90 and E129 but not C31, C101, and C104 were involved in binding to iron atom. Based on this and previous studies, it is proposed that the conserved motifs, C31-X n -C101-X2-C104 and H86-X3-H90-X23-E114-X14-(E/D)129, are respectively for sulfur and molecular oxygen binding and activation. These two conserved motifs are essential elements for the SOR activity.
Site-directed mutagenesis reveals new and essential elements for iron-coordination of the sulfur oxygenase reductase from the acidothermophilic Acidianus tengchongensis

ZhiWei Chen,ChengYing Jiang,ShuangJiang Liu,

科学通报(英文版) , 2009,
Abstract: Previous study on refolding of sulfur oxygenase reductase (SOR) inclusion bodies from recombinant Escherichia coli showed that iron was critical to the activity of the SOR from Acidianus ambivalens. In this study, enzymatic assays showed that 2,2′-Dipyridyl, Tiron and 8-hydroxyquinoline, which are specific for chelating ferrous or ferric ions, strongly inhibited the activity of SOR from A. tengchongensis, suggesting that iron atom is essential for SOR activity. Alignment of several functionally identified SORs and SOR-like sequences from genome database revealed a conserved, putative iron binding motif, H86-X3-H90-X n -E114-X n -E129 (numbering according to the Acidianus tengchongensis SOR sequence). Three mutants of SOR were generated by site-directed mutagenesis of H86, H90 and E129 into phenylalanine or alanine residue in this study. Circular dichroism spectrum determination indicated that there was no change of the secondary structures of mutant SORs, H86F, H90F and E129A, but all mutants were completely inactive. Through determination of iron contents we found that SOR mutants of H86F, H90F and E129A completely or partially lost iron, while mutants of C31S, C101S, and C104S (generated in a previous study) did not. This result indicated that H86, H90 and E129 but not C31, C101, and C104 were involved in binding to iron atom. Based on this and previous studies, it is proposed that the conserved motifs, C31-X n -C101-X2-C104 and H86-X3-H90-X23-E114-X14-(E/D)129, are respectively for sulfur and molecular oxygen binding and activation. These two conserved motifs are essential elements for the SOR activity. Supported by National Natural Science Foundation of China (Grant Nos. 30670018, 30621005) and State Key Basic Research and Development Program of China (Grant No. 2004CB719602)
A capillary-based method determining the permeability of sand layer for geothermal applications
Huajun Wang, Hongjie Zhao, Chengying Qi
International Journal of Energy and Environment , 2011,
Abstract: The hydraulic permeability is a major parameter for modelling the heat transfer of borehole heat exchangers (BHEs) in an aquifer, where the groundwater advection has a significant impact on the thermal performance of BHEs. This paper presented a novel method determining the hydraulic permeability of sand layer using the theory of capillary rise (CR). In this method, based on the observation on the dynamic CR process, the equilibrium height together with the fluid velocity was determined by the steepest descent method to calculate the hydraulic permeability. Further, a laboratory experimental setup was built to measure the hydraulic permeability of screened dry sand with different grain diameters. The measured results were in a good agreement with the predictions by other theoretical models. Finally, the effects of the filling height and immersion depth of the capillary tube on the test accuracy were discussed. The present method can also be applied for other porous materials with the grain diameter of 0.1-0.6mm.
Two-Edge-Corner Image Features for Registration of Geospatial Images with Large View Variations  [PDF]
Parvaneh Saeedi, Mao Mao
International Journal of Geosciences (IJG) , 2014, DOI: 10.4236/ijg.2014.511109
Abstract: This paper presents a robust image feature that can be used to automatically establish match correspondences between aerial images of suburban areas with large view variations. Unlike most commonly used invariant image features, this feature is view variant. The geometrical structure of the feature allows predicting its visual appearance according to the observer’s view. This feature is named 2EC (2 Edges and a Corner) as it utilizes two line segments or edges and their intersection or corner. These lines are constrained to correspond to the boundaries of rooftops. The description of each feature includes the two edges’ length, their intersection, orientation, and the image patch surrounded by a parallelogram that is constructed with the two edges. Potential match candidates are obtained by comparing features, while accounting for the geometrical changes that are expected due to large view variation. Once the putative matches are obtained, the outliers are filtered out using a projective matrix optimization method. Based on the results of the optimization process, a second round of matching is conducted within a more confined search space that leads to a more accurate match establishment. We demonstrate how establishing match correspondences using these features lead to computing more accurate camera parameters and fundamental matrix and therefore more accurate image registration and 3D reconstruction.
Recent progress and concerns in dementia: Distinguishing Alzheimer's disease and dementia with Lewy bodies via biochemical markers in the cerebrospinal fluid  [PDF]
Peizhong Mao
Advances in Biological Chemistry (ABC) , 2012, DOI: 10.4236/abc.2012.22022
Abstract: Dementia is mainly a neurodegenerative disorder involved in several systems, including central nervous system, endocrinology/metabolism system and circulatory system. Alzheimer’s disease (AD) and dementia with Lewy bodies (DLB) are the most common forms of the dementia, accounting for 60% - 80% and 10% - 20% of all cases, respectively. DLB is defined by widespread neocortical, limbic and brainstem Lewy bodies but frequently accompanied by variable levels of AD pathology. This pathological and clinical overlap makes their differential diagnosis complicated. Recent advances in the identification of disease bio-markers now make it possible to detect and distinguish their pathology in the early or preclinical stage of the diseases, even in cognitively normal individuals. In addition to the key biomarkers (amyloid β or Aβ, tau and α-synuclein), neurotrophins such as cocaine- and amphetamine-regulated transcript (CART) have also drawn attention due to their expressions and functions. This article summarizes the progress in the definition, pathology and diagnosis of dementia, with a focus on potential biochemical markers in the cere-brospinal fluid (CSF) in the differential diagnosis of the main forms of dementia. To prediction or early diagnosis of dementia, the role of specific and sensitive CSF biomarkers seems to be crucial in a routine clinical setting. The concerns and challenges in the biomarker field are also discussed.
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