Author: "ZHANG, DAKUN" / Language: undetermined - Searchworks@Jio Institute Digital Library Search Results

Author: Zhang Kejuan, Yan Xinlong, Li Xinsheng, Zhang Dakun, Shen Jin, and Tong Guobin
Subjects: Mechanics of Materials, Materials Chemistry, Surfaces and Interfaces, General Chemistry, Surfaces, Coatings and Films
Published: 2023

Author: Song Guozhi, Zhang Dakun, and Huang Cui
Subjects: chemistry.chemical_classification, Vertex (graph theory), Code (set theory), Conjecture, Biomedical Engineering, Biophysics, Bioengineering, Genetic code, Biochemistry, Amino acid, Combinatorics, chemistry, Nucleotide, Equivalence class, Group theory, Biotechnology, Mathematics
Abstract: All proteins are made of 20 different amino acids and there are 4 kinds of nucleotides in the amino acids. Three consecutive nucleotides on the gene which are called triplet codon are used to code an amino acid, and 64 triplet codons compose genetic code table. Central dogma (DNA-RNA-protein) has been acknowledged, but the process and mechanism of mRNA passing through the nuclear membrane still requires further investigation. For these two problems above, we have proposed in this paper a conjecture of nucleotide free triplet of nucleotide and get 20 equivalence classes in the condition of mapping from free triplet vertex set to nucleotide set using group theory. It needs to be considered whether the four numbers 3, 4, 20 and 64 here have relevance inside. Then the numbers 3, 4, 20 and 64 are connected together. It is important for analysis of triplet code and protein composition.
Published: 2015

Author: Jiang Guiyuan, Zhang Dakun, and Li Zhaoxin
Subjects: Similarity (geometry), business.industry, Feature extraction, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, Pattern recognition, Image segmentation, RANSAC, Image (mathematics), Ramer–Douglas–Peucker algorithm, Feature (computer vision), Computer Science::Computer Vision and Pattern Recognition, Piecewise, Computer vision, Artificial intelligence, business, Algorithm, Mathematics
Abstract: A feature-based algorithm for image mosaics with moving objects is proposed. Firstly, the algorithm eliminates feature points which are selected on moving objects during similarity transform, then outliers are eliminated using RANSAC algorithm. In the image blend phase, difference image between two images is created using homogeneous transformation matrix. Then region growth algorithm is used to segment the moving object region. Finally, a piecewise mapping algorithm for generating panoramic images is utilized. Experimental results show the effectiveness of the algorithm.
Published: 2010

Author: Zhang Dakun
Subjects: Combinatorics, Group (mathematics), P versus NP problem, Combinatorial optimization, Symmetry (geometry), Dihedral group, Eight queens puzzle, Equivalence class, Group theory, Mathematics
Abstract: After analyzed the feasible solutions of N-queens problem, this paper brought forward the concept of morphological gene and rules to extract morphological genes. It connected dihedral group, morphological gene combination with equivalence class of queens position of N-queens problem, summarized the one eighth rule of N-queens problem, then analyzed the causes for attenuate of one eighth rule from two aspects of group and symmetry of morphological gene combination. It provided a new mentality for further deep research of N-queens problem, and is of reference value for studying highly effective algorithm for N-queens problem.
Published: 2009

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