Key Engineering Materials Vols. 474-476

Abstract: Neighbor Joining Algorithm (Neighbor-Joining or NJ) is a common way to construct phylogenetic trees. To enhance the accuracy of constructing the phylogenetic trees, we use the Kimura three-parameter model to calculate the distance between sequences, raising a way to improve NJ. By computer simulation, we made a comparative analysis of the accuracy among the improved NJ, UPGMA, and the original NJ, the result showing that the improved NJ is superior to UPGMA and the original NJ.

Abstract: Fog may cause the impairment of image as well as the decrease in the distinguish ability. The present paper is to get rid of the weather’s influence from the impaired image. According to Retinex theory and exponential relationship between the degradation of the image and the depths of the scene points, it puts forward a fog-removing treatment based on combining high-frequency emphasis filtering and histogram equalization .Firstly, obtain the padding parameters and fill it. Secondly, filter the impaired image using Butterworth highpass filter of order 2. Through the padding parameters, Highpass filtering is not overly sensitive to the value of cutoff frequencies, as long as the radius of the filter is not so small that frequencies near the origin of the transform are passed. In which the gray-level tonality due to the low-frequency components was retained. Lastly, histogram balanced the image gotten last step. The simulation result based on Matlab shows his algorithm can effectively improve the visual effect scene under the condition of mist.

Abstract: Using CAPTCHA is a simple but convenient way to ensure user data security. It’s widely used in user authentication and user interaction. In this paper, CAPTCHA images from several typical websites were used as the research objects. The paper shows the whole process on image binarization, de-noising, dilation, splitting characters. Gives out the CAPTCHA images recognition algorithm based on edit distance which defines the string similarity. Experiments show that the proposed algorithm is simple, fast, robust performance and has a high recognition accuracy rate.

Abstract: This paper is concerned with the existence of analytic solutions of an iterative functional differential equation. By constructing a convergent power series solution of an auxiliary equation, analytic solutions for the original differential equation are obtained. We discuss not only those α at the hyperbolic case 0<|α|<1 but also those α near resonance under Diophantine condition.

Abstract: The Lennard-Jones (LJ) Potential Energy Problem is to construct the most stable form of N atoms of a molecule with the minimal LJ potential energy. This problem has a simple mathematical form Minimize subject to Where ,is the coordinates ofatom. This paper is to minimize the L-J potential on ,where n = 3N. however it is a challenging and diffcult problem for many optimization methods when N is larger. This paper presents an effective mathematical optimization algorithm for minimizing the LJ Potential and a series of elegant optimal solutions of atoms up to 310 were got.

Abstract: The approval of Hainan International Tourism Island Strategy gives a good opportunity to Hainan and Hainan tourism industry. The result of construction has to be shown to the world. How to show the results with a visual and image way is significant to the evaluation and identification of International Tourism Island results. Hainan Tourism Spots Virtual Reality System is the crystallization of virtual reality technology, geographic information systems technology and high-tech integrated application, which itself is advanced, novelty, strong-function, good- showing and new means of expression. The system not only is the display platform and the management platform, but also is the propaganda platform embodying the innovative thinking of policy makers, decision-making and leadership of tourism spots construction.

Abstract: In molecular dynamics, molecular mechanics and quantum mechanics for a complicated system, most of the numerical calculations are at the Lennard-Jones potential. So, effective treatment of Lennard-Jones potential shows an important role. This paper presents an effective algorithm for the optimization of Lennard-Jones potential. The algorithm is a genetic-based algorithm associated with the owerful discrete gradient method and the correct choice of initial coordinates. Numerical results show the effectiveness of the present algorithm and new bestresults for 39,40,42,48,55,75,76,97 atoms were found. These results might be used to study the structure of spherical viruses and molecules.

Abstract: With the raise of strategy on Hainan international tourism island ，the personnel training of Hainan's high level tourism management has become an important topic among the Hainan universities. Firstly, this paper analyses the demand trend of the teaching of Hainan's high level tourism management affected by the construction of Hainan international tourism island; dissects the current situations and problems of the Network Teaching of Hainan high level tourism management. Concentrated on these problems, this paper discusses deeply about the terrace, steps and traits of the Network Teaching mode of Hainan tourism management in the background of Hainan international tourism island .And then, to summarize the strengths compared with the traditional teaching methods.

Abstract: Cylinder helical gGear is widely used in industry. Multi-objective optimization design of the component is often met in its different application sSituation. In this paper a novel multi-objective optimization method based on Particle Swarm Optimization (PSO) algorithm is designed for applying to solve this kind of problem. A paradigm depicted in the paper shows the algorithm is practical.

Abstract: Suppose thatis a tree with. We know that .is called type 1 ifand type 2 if. In this paper, we give a sufficient condition for a tree withto be type 1.