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With the development of passive optical networks (PONs), to cache videos on optical network units (ONUs) is now considering as an efficient scheme for better-quality video service provision. In this paper, we study the problem of collaborative video distribution among ONUs under the limited storage capacity of each ONU with the aim to maximize the video hit ratio of ONUs (VHRO). Two scenarios will...
Sequence alignment is the foundation and an important part of bioinformatics. In local alignment of DNA, MUMmer Algorithm is a double sequence alignment approximation algorithm based on anchor, which includes the following steps: using the suffix tree to find the set of maximal unique matches(MUM), finding out a group of MUMs with the highest score from the set as the anchors, and finally completing...
The trajectory planning of Unmanned Aerial Vehicle (UAV) and Aerial Robots generally refers to a series of optimization problems. This paper presents a method of trajectory planning and design for UAV based on the A* algorithm. Using grids to process the trajectory path planning of UAV under the environment with presence of obstacles, and then search the shortest path from the initial point to the...
This paper presents a method of trajectory planning and design for Unmanned Aerial Vehicle (UAV) based on the A∗ algorithm. Using grids to process the trajectory path planning of UAV under the environment with presence of obstacles, and then find the shortest path from the initial point to the target point based on rasterized environment using A∗ algorithm. The simulation of trajectory planning is...
In digital communication systems, due to multipath transmission and the bandwidth of cable, there are some ISI(inter-symbol-interference) in the signals. Blind equalization that does not require a pilot sequence can transmit adaptive equalizer tap coefficients and can effectively remove inter-symbol interference. This paper introduces the principle of blind equalization technique that focus on the...
Data association is one of the key issues in SLAM. Against the accuracy of NN data association is low, but its efficiency is high and JCBB data association have high accuracy, but its efficiency is low, a hybrid data association strategy is proposed. At first NN produce an assumption H, according to conditions to decide whether we correct it or take what kind of corrective actions to get new assumption...
In computer games, high-quality pathfinding algorithms are important to bring satisfactory experiences to the players, which may improve the playability of computer game. The method of KM-A∗ belongs to hierarchical pathfinding, which incorporates the information of obstacle distribution when partitioning game maps using K-means clustering. This algorithm reduced unnecessary storage and unnatural paths...
As the iterations are much, and the adjustment speed is slow, the improvements are made to the standard BP neural network algorithm. The momentum term of the weight adjustment rule is improved, make the weight adjustment speed more quicker and the weight adjustment process more smoother. The simulation of a concrete example shows that the iterations of the improved BP neural network algorithm can...
During the past decade, Rapidly-exploring Random Tree (RRT) and its variants are shown to be powerful sampling based single query path planning approaches for robots in high-dimensional configuration space. However, the performance of such tree-based planners that rely on uniform sampling strategy degrades significantly when narrow passages are contained in the configuration space. Given the assumption...
Due to traditional and single video encryption algorithms canpsilat meet the needs of various net multimedia services. This paper references the H.264 video coding standard and video encryption algorithms, analyzes the existing video encryption algorithms from security, speed, compression ratio and date operability, and classes the video encryption algorithms according to security. It also proposes...
This paper deals with the hybrid flowshop scheduling problem with limited waiting time constraint. The problem is to determine a schedule that minimizes the makespan for a given set of jobs over a finite planning horizon respecting the constraint that for each job the waiting time between two consecutive stages cannot be greater than a given upper bound. To solve the problem, a constructive backtracking...
The attribute reduction of information system can improve the accuracy of knowledge discovery, machine learning, etc. and it also can improve the efficiency. This paper proposes an attribute testing reduction algorithm, the algorithm can make the information system retain as few as attributes under the condition that maintains the original style, it can not only save much time for the later system...
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