The task of mining erasable patterns(EPs)is a data mining problem that can help factory managers come up with the best product plans for the future.This problem has been studied by many scientists in recent times,and ...The task of mining erasable patterns(EPs)is a data mining problem that can help factory managers come up with the best product plans for the future.This problem has been studied by many scientists in recent times,and many approaches for mining EPs have been proposed.Erasable closed patterns(ECPs)are an abbreviated representation of EPs and can be con-sidered condensed representations of EPs without information loss.Current methods of mining ECPs identify huge numbers of such patterns,whereas intelligent systems only need a small number.A ranking process therefore needs to be applied prior to use,which causes a reduction in efficiency.To overcome this limitation,this study presents a robust method for mining top-rank-k ECPs in which the mining and ranking phases are combined into a single step.First,we propose a virtual-threshold-based pruning strategy to improve the mining speed.Based on this strategy and dPidset structure,we then develop a fast algorithm for mining top-rank-k ECPs,which we call TRK-ECP.Finally,we carry out experiments to compare the runtime of our TRK-ECP algorithm with two algorithms modified from dVM and TEPUS(Top-rank-k Erasable Pattern mining Using the Subsume concept),which are state-of-the-art algorithms for mining top-rank-k EPs.The results for the running time confirm that TRK-ECP outperforms the other experimental approaches in terms of mining the top-rank-k ECPs.展开更多
It remains a big challenge to develop solid-state stimuli-responsive materials for time-dependent information encryption and inkless erasable printing with long retention times.Herein,a 2D Cu_(2)I_(2)-based MOF with p...It remains a big challenge to develop solid-state stimuli-responsive materials for time-dependent information encryption and inkless erasable printing with long retention times.Herein,a 2D Cu_(2)I_(2)-based MOF with photoresponsive spiropyran(SP)groups orderly installed on its skeleton is developed.The structural isomerization from SP to colored merocyanine(MC)form can be triggered by removing the CH_(3)CN guests.Besides,the degree of structural isomerization and the retention time can be adjusted by controlling the amount of CH_(3)CN guests,exhibiting dynamic photochromic behavior with multicolor states and tunable retention time.Based on these advantages,time-dependent information encryption is successfully achieved.Furthermore,the long retention time(>72 h)of the MC form under daylight conditions in the CH_(3)CN-removed Cu_(2)I_(2)-based MOF and good repeatability make it promising in various applications,such as temporary calendars,price-cards,billboards,and reusable identity cards.This work provides a novel design strategy to fabricate multi-functional MOF-based smart materials for challenging applications of time-dependent information encryption and inkless erasable printing.展开更多
目的对加速康复外科(enhanced recovery after surgery,ERAS)理念在3D腹腔镜胃癌根治术护理中的应用效果进行分析。方法将2019年1月—2020年10月期间在钟祥市人民医院采用3D腹腔镜胃癌根治术治疗的60例胃癌患者作为研究对象,将患者随机...目的对加速康复外科(enhanced recovery after surgery,ERAS)理念在3D腹腔镜胃癌根治术护理中的应用效果进行分析。方法将2019年1月—2020年10月期间在钟祥市人民医院采用3D腹腔镜胃癌根治术治疗的60例胃癌患者作为研究对象,将患者随机分为观察组及对照组,各30例。观察组行ERAS理念护理,对照组行常规护理,比较2组患者最终护理结果。结果护理后,观察组临床指标(尿管拔管时间、术后排气时间、下床活动时间、进食时间、住院时间)均优于对照组,差异有统计学意义(P<0.05)。护理后,观察组疼痛评分比对照组患者低,差异有统计学意义(P<0.05)。观察组不良反应发生率低于对照组,差异有统计学意义(P<0.05)。结论对3D腹腔镜胃癌根治术治疗的患者采用ERAS理念进行护理管理,可以有效缓解相关症状,减少不良反应发生,降低疼痛评分,建议临床上推广。展开更多
文摘The task of mining erasable patterns(EPs)is a data mining problem that can help factory managers come up with the best product plans for the future.This problem has been studied by many scientists in recent times,and many approaches for mining EPs have been proposed.Erasable closed patterns(ECPs)are an abbreviated representation of EPs and can be con-sidered condensed representations of EPs without information loss.Current methods of mining ECPs identify huge numbers of such patterns,whereas intelligent systems only need a small number.A ranking process therefore needs to be applied prior to use,which causes a reduction in efficiency.To overcome this limitation,this study presents a robust method for mining top-rank-k ECPs in which the mining and ranking phases are combined into a single step.First,we propose a virtual-threshold-based pruning strategy to improve the mining speed.Based on this strategy and dPidset structure,we then develop a fast algorithm for mining top-rank-k ECPs,which we call TRK-ECP.Finally,we carry out experiments to compare the runtime of our TRK-ECP algorithm with two algorithms modified from dVM and TEPUS(Top-rank-k Erasable Pattern mining Using the Subsume concept),which are state-of-the-art algorithms for mining top-rank-k EPs.The results for the running time confirm that TRK-ECP outperforms the other experimental approaches in terms of mining the top-rank-k ECPs.
基金supported by the National Natural Science Foundation of China(Nos.21825106,92061201,22105175)Postdoctoral Research Grant in Henan Province(No.202102001)。
文摘It remains a big challenge to develop solid-state stimuli-responsive materials for time-dependent information encryption and inkless erasable printing with long retention times.Herein,a 2D Cu_(2)I_(2)-based MOF with photoresponsive spiropyran(SP)groups orderly installed on its skeleton is developed.The structural isomerization from SP to colored merocyanine(MC)form can be triggered by removing the CH_(3)CN guests.Besides,the degree of structural isomerization and the retention time can be adjusted by controlling the amount of CH_(3)CN guests,exhibiting dynamic photochromic behavior with multicolor states and tunable retention time.Based on these advantages,time-dependent information encryption is successfully achieved.Furthermore,the long retention time(>72 h)of the MC form under daylight conditions in the CH_(3)CN-removed Cu_(2)I_(2)-based MOF and good repeatability make it promising in various applications,such as temporary calendars,price-cards,billboards,and reusable identity cards.This work provides a novel design strategy to fabricate multi-functional MOF-based smart materials for challenging applications of time-dependent information encryption and inkless erasable printing.
文摘目的对加速康复外科(enhanced recovery after surgery,ERAS)理念在3D腹腔镜胃癌根治术护理中的应用效果进行分析。方法将2019年1月—2020年10月期间在钟祥市人民医院采用3D腹腔镜胃癌根治术治疗的60例胃癌患者作为研究对象,将患者随机分为观察组及对照组,各30例。观察组行ERAS理念护理,对照组行常规护理,比较2组患者最终护理结果。结果护理后,观察组临床指标(尿管拔管时间、术后排气时间、下床活动时间、进食时间、住院时间)均优于对照组,差异有统计学意义(P<0.05)。护理后,观察组疼痛评分比对照组患者低,差异有统计学意义(P<0.05)。观察组不良反应发生率低于对照组,差异有统计学意义(P<0.05)。结论对3D腹腔镜胃癌根治术治疗的患者采用ERAS理念进行护理管理,可以有效缓解相关症状,减少不良反应发生,降低疼痛评分,建议临床上推广。
