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Search Results: 1 - 10 of 31407 matches for " Gu Liang "
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The Symbolic OBDD Algorithm for Finding Optimal Semi-matching in Bipartite Graphs  [PDF]
Tianlong Gu, Liang Chang, Zhoubo Xu
Communications and Network (CN) , 2011, DOI: 10.4236/cn.2011.32009
Abstract: The optimal semi-matching problem is one relaxing form of the maximum cardinality matching problems in bipartite graphs, and finds its applications in load balancing. Ordered binary decision diagram (OBDD) is a canonical form to represent and manipulate Boolean functions efficiently. OBDD-based symbolic algorithms appear to give improved results for large-scale combinatorial optimization problems by searching nodes and edges implicitly. We present novel symbolic OBDD formulation and algorithm for the optimal semi-matching problem in bipartite graphs. The symbolic algorithm is initialized by heuristic searching initial matching and then iterates through generating residual network, building layered network, backward traversing node-disjoint augmenting paths, and updating semi-matching. It does not require explicit enumeration of the nodes and edges, and therefore can handle many complex executions in each step. Our simulations show that symbolic algorithm has better performance, especially on dense and large graphs.
A Novel Symbolic Algorithm for Maximum Weighted Matching in Bipartite Graphs  [PDF]
Tianlong Gu, Liang Chang, Zhoubo Xu
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2011, DOI: 10.4236/ijcns.2011.42014
Abstract: The maximum weighted matching problem in bipartite graphs is one of the classic combinatorial optimization problems, and arises in many different applications. Ordered binary decision diagram (OBDD) or algebraic decision diagram (ADD) or variants thereof provides canonical forms to represent and manipulate Boolean functions and pseudo-Boolean functions efficiently. ADD and OBDD-based symbolic algorithms give improved results for large-scale combinatorial optimization problems by searching nodes and edges implicitly. We present novel symbolic ADD formulation and algorithm for maximum weighted matching in bipartite graphs. The symbolic algorithm implements the Hungarian algorithm in the context of ADD and OBDD formulation and manipulations. It begins by setting feasible labelings of nodes and then iterates through a sequence of phases. Each phase is divided into two stages. The first stage is building equality bipartite graphs, and the second one is finding maximum cardinality matching in equality bipartite graph. The second stage iterates through the following steps: greedily searching initial matching, building layered network, backward traversing node-disjoint augmenting paths, updating cardinality matching and building residual network. The symbolic algorithm does not require explicit enumeration of the nodes and edges, and therefore can handle many complex executions in each step. Simulation experiments indicate that symbolic algorithm is competitive with traditional algorithms.
Nodes Activation Strategies of Pedestrian System in Rail Hub Areas: Taking East Asia for Example  [PDF]
Liang Wu, Wei Lu, Zongchao Gu
Current Urban Studies (CUS) , 2018, DOI: 10.4236/cus.2018.63021
Abstract:
Urban rail transit has been developed rapidly in high density cities in East Asia. The node space of the pedestrian system in the rail transit hub area is the main carrier of the social public life, but its performance in usability and readability is negative. Based on the recent development cases in many cities of China and Japan, this paper puts forward the modes and approaches of node activation from three aspects of aggregation, ecology and humanity, which can be used as a reference for urban vitality promotion in the rail transit hub area.
Organization and Operation Mechanism of Urban Design Guidance of Metro Hub Areas  [PDF]
Liang Wu, Wei Lu, Zongchao Gu
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.610001
Abstract: Urban spatial relationship of Metro Hub Area is extremely complex, and urban design guidance plays an important role in promoting the development of urban space. Firstly, urban design institution system should be established with both restraint and incentive, making it be integrated with the planning system and obtain legal status. Secondly, the special agency unit with special committees in charge of urban design should be established in the urban planning management department to strengthen the coordination between the relevant agencies. Finally, whole process multipartite mode should be established, maintaining communication and supervision at all stages of urban development, and promoting the smooth implementation of urban design.
Semilocal Convergence for a Fifth-Order Newton's Method Using Recurrence Relations in Banach Spaces
Liang Chen,Chuanqing Gu,Yanfang Ma
Journal of Applied Mathematics , 2011, DOI: 10.1155/2011/786306
Abstract: We study a modified Newton's method with fifth-order convergence for nonlinear equations in Banach spaces. We make an attempt to establish the semilocal convergence of this method by using recurrence relations. The recurrence relations for the method are derived, and then an existence-uniqueness theorem is given to establish the R-order of the method to be five and a priori error bounds. Finally, a numerical application is presented to demonstrate our approach.
Preferred clusters in metallic glasses

Yang Liang,Guo Gu-Qing,

中国物理 B , 2010,
Abstract: In this work, we present a feasible scheme based on framework of the sophisticated Voronoi tessellation method in order to evaluate what clusters should be preferred for building blocks in any given metallic glass, by analysing the fivefold-symmetry axes as well as the degree of structural regularity in various clusters. This scheme is well proved by a group of experiments and calculations, which may have broad implications for exploration of obtaining explicit and proper structural pictures, and understanding the structural origin of the unique properties and glass forming ability in these novel amorphous alloys.
The Statistical Analysis of a Certain Kind of Sales Diffusion Model
Shu LIANG,Xiaoling XU,Beiqing GU
Management Science and Engineering , 2012, DOI: 10.3968/j.mse.1913035x20120604.zr0218
Abstract: The essay works out MLE (Maximum Likelihood Estimation) of probability model parameter about the third sales diffusion curve given by ZHENG Zukang and researches the existence of the estimation. Besides, this essay inspects the accuracy of the estimation via Monte Carlo simulation and throws light on methods of essay by simulated data. Key words: Sales diffusion model; Maximum Likelihood Estimation; Monte Carlo simulation
Theoretical Study on the Static (Hyper)Polarizabilities of α-t-Bu-ω-CN-Poly(methylphenyl)silane
Jing Li,Liang Peng,Feng Long Gu
Advances in Physical Chemistry , 2013, DOI: 10.1155/2013/905910
Abstract:
Quantitative Assessment of 2q35-rs13387042 Polymorphism and Hormone Receptor Status with Breast Cancer Risk
Chao Gu, Liang Zhou, Jianping Yu
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0066979
Abstract: Background The association between rs13387042 polymorphism on 2q35 and breast cancer (BC) has been widely evaluated since it was first identified through genome-wide association approach. However, the results have been inconclusive. To investigate this inconsistency, we performed a meta-analysis of all available studies dealing with the relationship between the 2q35-rs13387042 polymorphism and BC. Methods Databases including MEDLINE, PubMed, EMBASE, ISI web of science and CNKI (China National Knowledge Infrastructure) were searched to find relevant studies. Odds ratios (ORs) with 95% confidence intervals (CIs) were used to assess the strength of association. The random-effects model was applied, addressing heterogeneity and publication bias. Results A total of 24 articles involving 99,772 cases and 164,985 controls were included. In a combined analysis, the summary per-allele odds ratio (OR) for BC of 2q35-rs13387042 polymorphism was 1.13 (95% CI: 1.11–1.16; P<10?5). Significant associations were also detected under co-dominant, dominant and recessive genetic models. In the subgroup analysis by ethnicity, significantly increased risks were found in Asians, Caucasians and Hispanic whites for the polymorphism in all comparisons; whereas no significant associations were found among Africans. In addition, we find 2q35-rs13387042 polymorphism conferred significantly risks for both ER-positive and ER-negative tumors. Furthermore, significant associations were also detected both in PR–positive and PR–negative cancer. Conclusions Our findings demonstrated that rs13387042-A allele is a risk-conferring factors for the development of BC, especially in Asians, Caucasians and Hispanic whites.
Theoretical Study on the Static (Hyper)Polarizabilities of α-t-Bu-ω-CN-Poly(methylphenyl)silane
Jing Li,Liang Peng,Feng Long Gu
Advances in Physical Chemistry , 2013, DOI: 10.1155/2013/905910
Abstract: The static linear and nonlinear optical properties of the σ-conjugated polymer α-t-Bu-ω-CN-poly(methylphenyl)silane (PMS) are studied at the Coupled-Perturbed Hartree-Fock (CPHF) level with 6-31+G(d) basis set. The calculated results reveal that the static first hyperpolarizabilities of this system increase with the main chain length and have a good agreement with experiments. The (hyper)polarizabilities per unit cell have been extrapolated to infinite chain limit and a comparison is made to those of polysilane and polyacetylene (PA). Besides, other structural properties depending on the σ-conjugated Si–Si skeleton length are investigated as well. Electron correlation effect is estimated and it turns out that the MP2 static first hyperpolarizability is about times larger than the corresponding CPHF value for the polymer with . 1. Introduction In recent years, polysilanes have attracted increasingly extensive attention due to their unique physical and chemical properties resulting from σ-electrons delocalized along the silicon backbone. In this regard, they have resulted in a variety of technological applications, such as conductor and semiconductor [1], photoconductive materials [2], organic multilayer, light emitting diodes (LEDs) [3], high-density optical data storage materials [4], electro luminescence (EL) devices [5, 6], and nonlinear optical (NLO) materials [7, 8]. The polysilanes represent a completely new class of potentially interesting nonlinear optical (NLO) materials, and in contrast to the classical π-conjugated polymers, their physical, chemical, and optical properties show significant differences. Polysilanes are linear polymers of silicon, and the σ-electrons of the polymer backbone are delocalized. This σ-conjugation gives rise to electronic properties that allow for possible applications as electroluminescent, nonlinear, optical, lithographic, and semiconductor materials. The σ-electrons delocalization associated with the phenomenon, in which the silicon backbone itself is a chromophore, greatly influences the optical properties of polysilanes. Therefore, in spite of saturation of all the Si atoms on the main chain, polysilanes have strong absorption in the UV in the region of 250–400?nm, which is attributed to the σ-σ* transition or the σ3d transition and relevant to the configuration and length of the Si–Si backbone. As NLO materials, in comparison with π-conjugated carbon-backbone polymers, polysilanes own many unique advantages; for example, they have optical transparency in the visible spectrum, their UV absorption peak can be
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