分析了应用于个性化推荐的Web页面关联规则的特点,提出了“壹支持数下k关联规则”的思想,根据这一思想设计、实现了一种应用于个性化推荐的Web页面关联规则挖掘算法——PARM(Pageview Association Rule Mining)及频繁项集的Freq-Set-Tre...分析了应用于个性化推荐的Web页面关联规则的特点,提出了“壹支持数下k关联规则”的思想,根据这一思想设计、实现了一种应用于个性化推荐的Web页面关联规则挖掘算法——PARM(Pageview Association Rule Mining)及频繁项集的Freq-Set-Tree存储结构,在产生频繁项的同时挖掘关联规则,因而能提高效率。实验证明在个性化推荐系统中PARM算法的效率明显高于FP-Growth算法。展开更多
In order to investigate the non-bonded interaction between picene and B12 N12 nano ring(BNNR) in different orientations and distances, we focused on a single-wall boronnitride B12 N12 nano-ring. The geometry of molecu...In order to investigate the non-bonded interaction between picene and B12 N12 nano ring(BNNR) in different orientations and distances, we focused on a single-wall boronnitride B12 N12 nano-ring. The geometry of molecules was optimized using the B3 LYP method with 6-31 g* basis set. The reactivity and stability of picene as an aromatic compound alone and upon exposure to BNNR were checked. Then NBO, FREQ, NICS and adsorption energy of picene alone and in the presence of BNNR Field were derived to estimate the picene structural stability.The results of any order were found to reduce the reactivity and increase the stability for picene in the presence BNNR field.展开更多
文摘分析了应用于个性化推荐的Web页面关联规则的特点,提出了“壹支持数下k关联规则”的思想,根据这一思想设计、实现了一种应用于个性化推荐的Web页面关联规则挖掘算法——PARM(Pageview Association Rule Mining)及频繁项集的Freq-Set-Tree存储结构,在产生频繁项的同时挖掘关联规则,因而能提高效率。实验证明在个性化推荐系统中PARM算法的效率明显高于FP-Growth算法。
基金supported by the Islamic Azad University of Islamshahr
文摘In order to investigate the non-bonded interaction between picene and B12 N12 nano ring(BNNR) in different orientations and distances, we focused on a single-wall boronnitride B12 N12 nano-ring. The geometry of molecules was optimized using the B3 LYP method with 6-31 g* basis set. The reactivity and stability of picene as an aromatic compound alone and upon exposure to BNNR were checked. Then NBO, FREQ, NICS and adsorption energy of picene alone and in the presence of BNNR Field were derived to estimate the picene structural stability.The results of any order were found to reduce the reactivity and increase the stability for picene in the presence BNNR field.
