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Search Results: 1 - 10 of 37551 matches for " Cheng Hock Tian "
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Application of Probabilistic Analysis in Finite Element Modeling of Prestressed Inverted T-Beam with Web Openings
Tie Ming,Cheng Hock Tian,Zahrizan bin Zakaria,Ideris bin Zakaria
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: Recent trends of structural mechanics applications in finite element analysis demonstrate an increasing demand for efficient analysis tools. This paper presents a probabilistic analysis approach applied in finite element analysis for modeling prestressed inverted T-beams with web openings structure used in building service system (mechanical, electrical, communications, and plumbing). The experimental program reported in this paper tested four prestressed inverted T-beams with circular web openings to failure to evaluate the openings' effect on various beam behaviors. Using ANSYS, finite element models were developed to simulate beam deflection behavior. Comparison of analytical results with the available experimental results for loaddeflection relationships showed good agreement between both results. Probabilistic analysis methodology could predict the response (i.e., deflection, stress, strain etc) due to various combination of input variables (i.e., Poisson`s ratio, modulus of elasticity, etc). In reality, uncertainties exist in a system and environment that may make the application of deterministic design unreliable which causes the values of the variables that are acting on the system cannot be predicted with certainty. As such, probabilistic approach was applied to the model after deterministic analysis. In this study, the probabilistic analysis approach was applied to account for the variability in fabrication. Probabilistic methodology applied in finite element modeling provides another alternative ways of structural analysis of preststressed inverted T-beams with web openings to achieve a robust and reliable design in a more efficient way. In this study, Monte Carlo simulation was used to analyze the effect of parameter uncertainty for the prestressed inverted T-beams with web openings. From the analysis results, it was observed that the changes in prestressing force, elastic modulus of prestressing steel, ultimate tensile strength of prestressing steel and beam width tend to be the most influencing parameters, which need to be tightly controlled. As a result, from deterministic analysis and probabilistic analysis, it was found that probabilistic analysis tends to be closer to reality than deterministic methods and gives a way of designing for quality.
Optimal strategies for a class of sequential control problems with precedence relations
Hock Peng Chan,Cheng-Der Fuh,Inchi Hu
Mathematics , 2006,
Abstract: Consider the following multi-phase project management problem. Each project is divided into several phases. All projects enter the next phase at the same point chosen by the decision maker based on observations up to that point. Within each phase, one can pursue the projects in any order. When pursuing the project with one unit of resource, the project state changes according to a Markov chain. The probability distribution of the Markov chain is known up to an unknown parameter. When pursued, the project generates a random reward depending on the phase and the state of the project and the unknown parameter. The decision maker faces two problems: (a) how to allocate resources to projects within each phase, and (b) when to enter the next phase, so that the total expected reward is as large as possible. In this paper, we formulate the preceding problem as a stochastic scheduling problem and propose asymptotic optimal strategies, which minimize the shortfall from perfect information payoff. Concrete examples are given to illustrate our method.
Multi-armed bandit problem with precedence relations
Hock Peng Chan,Cheng-Der Fuh,Inchi Hu
Mathematics , 2007, DOI: 10.1214/074921706000001067
Abstract: Consider a multi-phase project management problem where the decision maker needs to deal with two issues: (a) how to allocate resources to projects within each phase, and (b) when to enter the next phase, so that the total expected reward is as large as possible. We formulate the problem as a multi-armed bandit problem with precedence relations. In Chan, Fuh and Hu (2005), a class of asymptotically optimal arm-pulling strategies is constructed to minimize the shortfall from perfect information payoff. Here we further explore optimality properties of the proposed strategies. First, we show that the efficiency benchmark, which is given by the regret lower bound, reduces to those in Lai and Robbins (1985), Hu and Wei (1989), and Fuh and Hu (2000). This implies that the proposed strategy is also optimal under the settings of aforementioned papers. Secondly, we establish the super-efficiency of proposed strategies when the bad set is empty. Thirdly, we show that they are still optimal with constant switching cost between arms. In addition, we prove that the Wald's equation holds for Markov chains under Harris recurrent condition, which is an important tool in studying the efficiency of the proposed strategies.
Study on the Ecotourism Development in Dazhou  [PDF]
Xiaomei Pu, Lin Tian, Zibiao Cheng
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.65002
Abstract: After comprehensive discussion of the origin of ecotourism, the concept of ecotourism and the theoretical basis for ecotourism development, the paper carried out the SWOT analysis on ecotourism development in Dazhou City, and then proposed development strategies. The strategies were to: enhance the ecological awareness of the entire people and create a good atmosphere for ecotourism development; break the talent bottleneck of ecotourism development by adopting the policy of “combination boxing”; make scientific and feasible master plan for Dazhou’s ecotourism development; develop quality ecotourism products; innovate marketing strategies for ecotourism in Dazhou.
DBSC-Based Grayscale Line Image Vectorization
Konstantin Melikhov,Feng Tian,Jie Qiu,Quan Chen,Hock Soon Seah,
Konstantin Melikhov
,Feng Tian,Jie Qiu,Quan Chen,and Hock Soon Seah

计算机科学技术学报 , 2006,
Abstract: Vector graphics plays an important role in computer animation and imaging technologies. However present techniques and tools cannot fully replace traditional pencil and paper. Additionally, vector representation of an image is not always available. There is not yet a good solution for vectorizing a picture drawn on a paper. This work attempts to solve the problem of vectorizing grayscale line drawings. The solution proposed uses Disk B-Spline curves to represent strokes of an image in vector form. The algorithm builds a vector representation from a grayscale raster image, which can be a scanned picture for instance. The proposed method uses a Gaussian sliding window to calculate skeleton and perceptive width of a stroke. As a result of vectorization, the given image is represented by a set of Disk B-Spline curves.
An Improved Interference Cancellation Scheme for Two-User MIMO-MAC
Xinji Tian,Cheng Song
International Journal of Computer Science Issues , 2013,
Abstract: Multi-Input Multi-Output (MIMO) Multiple Access Channels (MAC) for two-user suffers from co-channel interference. For this problem, an interference cancellation scheme based on limited feedback is proposed. Through diagonalization processing for transmitted signals according to feedback information, the co-channel interference is eliminated. Not only the reliability is improved, but also each signal can be Maximum Likelihood (ML) decoded separately. Simulation results show that, compared to the existing interference cancellation scheme, the gain of the proposed scheme is 2dB at the Bit Error Rate (BER) of 10-3.
Strong Convergence Theorem by Monotone Hybrid Algorithm for Equilibrium Problems, Hemirelatively Nonexpansive Mappings, and Maximal Monotone Operators
Yun Cheng,Ming Tian
Fixed Point Theory and Applications , 2009, DOI: 10.1155/2008/617248
Abstract: We introduce a new hybrid iterative algorithm for finding a common element of the set of fixed points of hemirelatively nonexpansive mappings and the set of solutions of an equilibrium problem and for finding a common element of the set of zero points of maximal monotone operators and the set of solutions of an equilibrium problem in a Banach space. Using this theorem, we obtain three new results for finding a solution of an equilibrium problem, a fixed point of a hemirelatively nonexpnasive mapping, and a zero point of maximal monotone operators in a Banach space.
Strong Convergence Theorem by Monotone Hybrid Algorithm for Equilibrium Problems, Hemirelatively Nonexpansive Mappings, and Maximal Monotone Operators
Cheng Yun,Tian Ming
Fixed Point Theory and Applications , 2008,
Abstract: We introduce a new hybrid iterative algorithm for finding a common element of the set of fixed points of hemirelatively nonexpansive mappings and the set of solutions of an equilibrium problem and for finding a common element of the set of zero points of maximal monotone operators and the set of solutions of an equilibrium problem in a Banach space. Using this theorem, we obtain three new results for finding a solution of an equilibrium problem, a fixed point of a hemirelatively nonexpnasive mapping, and a zero point of maximal monotone operators in a Banach space.
Auto Coloring with Enhanced Character Registration
Jie Qiu,Hock Soon Seah,Feng Tian,Quan Chen,Zhongke Wu,Konstantin Melikhov
International Journal of Computer Games Technology , 2008, DOI: 10.1155/2008/135398
Abstract: An enhanced character registration method is proposed in this paper to assist the auto coloring for 2D animation characters. After skeletons are extracted, the skeleton of the character in a target frame is relocated based on a stable branch in a reference frame. Subsequently the characters among a sequence are automatically matched and registered. Occlusion are then detected and located in certain components segmented from the character. Two different approaches are applied to color regions in components without and with occlusion respectively. The approach has been tested for coloring a practical animation sequence and achieved high coloring accuracy, showing its applicability in commercial animation production.
Solitary Infantile Myofibromatosis: Report of Two Cases
Fang-Ying Kuo,Shun-Cheng Huang,Hock-Liew Eng,Jiin-Haur Chuang
Chang Gung Medical Journal , 2002,
Abstract: Infantile myofibromatosis (IM) is an unusual tumor of infancy and early childhood. Ittypically presents as a solitary or multicentric nodular mass involving skin, soft tissue, bone,or viscera. We describe 2 cases of solitary infantile myofibromatosis (IM) of the soft tissuewith typical light microscopic features. The first is a 7-month-old boy who had a rapidlygrowing tumor of the right thigh. The fragile tumor, measuring 7.0 6.0 3.5 cm was completelyremoved, but the patient was lost to follow-up after surgery. The second case, a 2-year-old boy, was referred from a local clinic due to a non-tender mass in the left abdominalwall. The tumor, measuring 2.0 2.0 1.6 cm, was completely excised. No recurrence ormalignant transformation was found after 22 months of follow-up. The histopathologic, histochemical,and immunohistochemical features of the tumors were studied. Reticulin preparationshowed that the tumor cells were outside the reticulin sheath of the vascular spacesand were individually enclosed by reticulin fibers. Tests for vimentin, anti-α-smooth muscleactin, and myoglobin were positive in the neoplastic spindle cells. IM has a variable appearanceon radiologic images and often mimics an aggressive neoplasm. These factors canmake a rapid and correct diagnosis difficult. IM must be considered in the differential diagnosisin any child who presents with either solitary or multiple tumors, particularly thoseoccurring in the neonatal period.
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