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Based on the JEDEC standard, the three-dimensional finite element model of board level VFBGA package components was established, and the reliability of low silver lead-free solder Sn0.3Ag0.7Cu under drop impact was observed. The results show that, the mechanical impact and bending of PCB caused by mechanical shock are the main reasons which induce the drop failure of solder joint in the drop impact...
Based on the JEDEC standard, the three-dimensional finite element model of board level VFBGA package components was established, and the reliability of low silver lead-free solder Sn0.3Ag0.7Cu under drop impact was observed. The results show that, the mechanical impact and bending of PCB caused by mechanical shock are the main reasons which induce the drop failure of solder joint in the drop impact...
In this paper, we study mean first-passage time (MFPT) for random walks on a network through edge iteration. The feature of this kind of network is that every existing edge gives birth to finite nodes at each step. According to the network structures, we obtain the analytical expression for MFPT, which shows that the MFPT grows as a power-law function with the number of nodes in the large limit of...
In this paper, we study the problems about fuzzy degrees of fuzzy n - cell numbers, which can be used in ranking uncertain multi-channel digital signal information. Firstly, we introduce concepts of vector-valued fuzzy degrees and weight (number-valued) fuzzy degrees of fuzzy n - cell numbers, and then investigate their properties. At last, in order to be conveniently used in applications, we give...
We know that ranking fuzzy numbers plays an important role in decision-making and some other fuzzy application areas. In this paper, a new definition on mean of fuzzy number---quasi-mean is given. Based on the quasi-means and fuzzy degree we propose a new method for ranking fuzzy numbers. This method has the characteristics of generality, less calculation, high efficiency and it is especially tailed...
In this paper, we focus on camera calibration problem of circular markers. We propose the iterative method to calculate the coordinates of tangency points, and then get the camera parameters due to the imaging model. To reduce the error, we preprocess the original image using loG edge Detection. At last, we simulate and test this method. The results show that the method has a higher accuracy.
In this paper, we introduce the concept of pyramid fuzzy numbers, which may be conveniently used in some practical applications like triangle fuzzy numbers, investigate their properties, and obtain their operations rules of addition and scalar multiplication. And then, on the pyramid fuzzy number space, we define a metric that not only holds the suitability but also convenient for getting an arithmetic...
We know that decision-making is one of very important research topics in application areas and the base of decision-making is ranking, therefore ranking fuzzy numbers is also a significant research area. In this paper, we propose a new method for ranking fuzzy numbers-endpoint method. Using this mean, the only condition we need are some special points of the fuzzy number that contains the interval...
It is known that to deep systematically study the theory in relation to general discrete fuzzy numbers always will encounter some difficulties since the metric and the difference of two general discrete fuzzy numbers cannot reasonably be defined. In this paper, we define a special sort discrete fuzzy numbers-discrete fuzzy number on a fixed set with finite support set, on which we can study the problems...
In this paper, using the representations of discrete fuzzy numbers, we give a new kind of operations of addition and multiplication for discrete fuzzy numbers. Then, we show that the new addition and multiplication keep the closeness of the operation, so they get over the defect that the usual addition and multiplication does not keep the closeness of operation. And we also point out that when the...
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