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提出了采用基于CGAL库定义的Nef多面体数据结构,并结合Nef多面体之间的三维布尔操作来解决组网雷达探测范围相互重叠的雷达包络可视化问题。试验测试结果表明,每组试验样本求交后的三角网格正常,可视化效果好,满足项目应用需求。 相似文献
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Ian G. Macreadie Alister C. Ward Paul Failla Ahmed A. Azad Elizabeth Grgacic Dale McPhee 《Yeast (Chichester, England)》1993,9(6):565-573
The nef gene of human immunodeficiency virus type 1 (HIV-1) has been expressed in the yeast Saccharomyces cerevisiae to produce native Nef proteins. The proteins of Mr 27 kDa and 25 kDa, produced by translation from the first and second start codons of the nef gene react with human HIV-1 antisera. Under low-level steady-state expression conditions, Nef27 undergoes myristylation and is targeted to the nuclear fraction while Nef25 is not myristylated and not nuclear localized. When produced rapidly and to high levels, Nef27 is initially present in the cytoplasm as a soluble myristylated protein that later fractionates with the nucleus. 相似文献
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目的表达人免疫缺陷病毒1型C亚型调控蛋白Nef,为研制HIV疫苗寻找新的途径。方法通过PCR扩增,获得HIV-1C亚型Nef基因片段,并将其克隆到原核表达载体pGEX-5X-1中,转化大肠杆菌BL21(DE3),IPTG诱导表达后,以SDS-PAGE和Westernblot分析表达产物。结果表达产物是相对分子质量为50000的GST融合蛋白,且能与p27单克隆抗体发生特异性反应。结论重组Nef蛋白在大肠杆菌中得到了有效表达。 相似文献
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Peter Hachenberger 《Algorithmica》2009,55(2):329-345
We present the first exact and robust implementation of the 3D Minkowski sum of two non-convex polyhedra. Our implementation
decomposes the two polyhedra into convex pieces, performs pairwise Minkowski sums on the convex pieces, and constructs their
union. We achieve exactness and the handling of all degeneracies by building upon 3D Nef polyhedra as provided by Cgal. The implementation also supports open and closed polyhedra. This allows the handling of degenerate scenarios like the tight
passage problem in robot motion planning.
The bottleneck of our approach is the union step. We address efficiency by optimizing this step by two means: we implement
an efficient decomposition that yields a small number of convex pieces, and develop, test and optimize multiple strategies
for uniting the partial sums by consecutive binary union operations.
The decomposition that we implemented as part of the Minkowski sum is interesting in its own right. It is the first robust
implementation of a decomposition of polyhedra into convex pieces that yields at most O(r
2) pieces, where r is the number of edges whose adjacent facets comprise an angle of more than 180 degrees with respect to the interior of the
polyhedron.
This work was partially supported by the Netherlands’ Organisation for Scientific Research (NWO) under project no. 639.023.301. 相似文献
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