This paper presents a method for generating a region with a lot of randomly distributed ellipsoids. Using the parametric expression of an ellipsoid, the criterion for determining if a spatial point is in the interior or exterior of the ellipsoid is established. Then the computation of the distance between a point and the ellipsoid is converted into finding the solution to an optimization problem, which can be efficiently approximated by the searching method. Based on these facts, the proposed method is able to make the distance between generated ellipsoids very small and then successfully improve the content of ellipsoids grains in the region. Numerical results show that the proposed method can generate simulation of specimens in which the content of ellipsoids is higher than 55% according to four-graded aggregates, 50% according to three-graded aggregates, and 45% according to two-graded aggregates, respectively, in relatively short time.

Abstract-Currently, the pharmacology teaching is popularized and becomes one of indicators and important compositions of all curricula initial in medical or nurse's college. But it is very difficult for student, particularly English is not his native language. This article design will take students as the primary object, set up a perfect test database, and conduct opening studying mode in form of "QQ group" or "pharmacology blog" discussion. To solve it that the teaching contents of pharmacology are very abstract and logistical, and they are difficult for students to master most contents in a short period. All of these will play an active role in pharmacology studying and teaching.

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