While progress has been made in information source localization,it has overlooked the prevalent friend and adversarial relationships in social networks.This paper addresses this gap by focusing on source localization ...While progress has been made in information source localization,it has overlooked the prevalent friend and adversarial relationships in social networks.This paper addresses this gap by focusing on source localization in signed network models.Leveraging the topological characteristics of signed networks and transforming the propagation probability into effective distance,we propose an optimization method for observer selection.Additionally,by using the reverse propagation algorithm we present a method for information source localization in signed networks.Extensive experimental results demonstrate that a higher proportion of positive edges within signed networks contributes to more favorable source localization,and the higher the ratio of propagation rates between positive and negative edges,the more accurate the source localization becomes.Interestingly,this aligns with our observation that,in reality,the number of friends tends to be greater than the number of adversaries,and the likelihood of information propagation among friends is often higher than among adversaries.In addition,the source located at the periphery of the network is not easy to identify.Furthermore,our proposed observer selection method based on effective distance achieves higher operational efficiency and exhibits higher accuracy in information source localization,compared with three strategies for observer selection based on the classical full-order neighbor coverage.展开更多
壳聚糖温敏凝胶是一种新型的可注射、在体固化的载体材料,该材料在室温条件下呈生理中性的溶液状态,在37℃左右可由溶液转变成水凝胶。该水凝胶对大分子药物具有良好的缓释效能,但对小分子药物缓释效能极差。为制备同时缓释生长因子重...壳聚糖温敏凝胶是一种新型的可注射、在体固化的载体材料,该材料在室温条件下呈生理中性的溶液状态,在37℃左右可由溶液转变成水凝胶。该水凝胶对大分子药物具有良好的缓释效能,但对小分子药物缓释效能极差。为制备同时缓释生长因子重组人骨形态发生蛋白-2(recombined human bone morphogenetic protein-2,rhBMP-2)和抗菌药物氯己定的功能性壳聚糖温敏凝胶,将小分子药物氯己定先与β-环糊精制备成包结物,再将rhBMP-2与β-环糊精/氯己定包结物共混于壳聚糖温敏凝胶中,通过HAAKE粘度测量仪,对比加入目标药物前后系统的流变学性质,并且分别通过高效液相(high performance liquid chromatography,HPLC)和酶联免疫吸附(enzyme-linkedimmunosorbent assay,ELISA)方法测量目标药物的体外释放性质,温敏凝胶系统的流变学性质几乎未受加入药物的影响。而氯己定从凝胶系统中释放的速度大大减慢,药物持续释放可保持1月以上。同时,rhBMP-2也获得较好的缓释效果。通过先行环糊精包结共混的方法,成功制备同时缓释rhBMP-2和氯己定的功能性温敏凝胶。展开更多
以β-环糊精(-βCD)为原料,经过对甲苯磺酰化、胺化制得胺化环糊精(3);以壳聚糖为原料,制备O-羧甲基壳聚糖(4);4的羧基与3的氨基在催化剂EDC{1-[3-(D im ethyl am ino)propyl]-3-ethylcarbod iim ide hydrochlo-ride}作用下水相反应,制...以β-环糊精(-βCD)为原料,经过对甲苯磺酰化、胺化制得胺化环糊精(3);以壳聚糖为原料,制备O-羧甲基壳聚糖(4);4的羧基与3的氨基在催化剂EDC{1-[3-(D im ethyl am ino)propyl]-3-ethylcarbod iim ide hydrochlo-ride}作用下水相反应,制得了一种新型壳聚糖固载环糊精分子(1),总收率29%,-βCD表观固载量9.5%。1的结构经1H NMR和IR表征。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.62103375 and 62006106)the Zhejiang Provincial Philosophy and Social Science Planning Project(Grant No.22NDJC009Z)+1 种基金the Education Ministry Humanities and Social Science Foundation of China(Grant Nos.19YJCZH056 and 21YJC630120)the Natural Science Foundation of Zhejiang Province of China(Grant Nos.LY23F030003 and LQ21F020005).
文摘While progress has been made in information source localization,it has overlooked the prevalent friend and adversarial relationships in social networks.This paper addresses this gap by focusing on source localization in signed network models.Leveraging the topological characteristics of signed networks and transforming the propagation probability into effective distance,we propose an optimization method for observer selection.Additionally,by using the reverse propagation algorithm we present a method for information source localization in signed networks.Extensive experimental results demonstrate that a higher proportion of positive edges within signed networks contributes to more favorable source localization,and the higher the ratio of propagation rates between positive and negative edges,the more accurate the source localization becomes.Interestingly,this aligns with our observation that,in reality,the number of friends tends to be greater than the number of adversaries,and the likelihood of information propagation among friends is often higher than among adversaries.In addition,the source located at the periphery of the network is not easy to identify.Furthermore,our proposed observer selection method based on effective distance achieves higher operational efficiency and exhibits higher accuracy in information source localization,compared with three strategies for observer selection based on the classical full-order neighbor coverage.
文摘壳聚糖温敏凝胶是一种新型的可注射、在体固化的载体材料,该材料在室温条件下呈生理中性的溶液状态,在37℃左右可由溶液转变成水凝胶。该水凝胶对大分子药物具有良好的缓释效能,但对小分子药物缓释效能极差。为制备同时缓释生长因子重组人骨形态发生蛋白-2(recombined human bone morphogenetic protein-2,rhBMP-2)和抗菌药物氯己定的功能性壳聚糖温敏凝胶,将小分子药物氯己定先与β-环糊精制备成包结物,再将rhBMP-2与β-环糊精/氯己定包结物共混于壳聚糖温敏凝胶中,通过HAAKE粘度测量仪,对比加入目标药物前后系统的流变学性质,并且分别通过高效液相(high performance liquid chromatography,HPLC)和酶联免疫吸附(enzyme-linkedimmunosorbent assay,ELISA)方法测量目标药物的体外释放性质,温敏凝胶系统的流变学性质几乎未受加入药物的影响。而氯己定从凝胶系统中释放的速度大大减慢,药物持续释放可保持1月以上。同时,rhBMP-2也获得较好的缓释效果。通过先行环糊精包结共混的方法,成功制备同时缓释rhBMP-2和氯己定的功能性温敏凝胶。
文摘以β-环糊精(-βCD)为原料,经过对甲苯磺酰化、胺化制得胺化环糊精(3);以壳聚糖为原料,制备O-羧甲基壳聚糖(4);4的羧基与3的氨基在催化剂EDC{1-[3-(D im ethyl am ino)propyl]-3-ethylcarbod iim ide hydrochlo-ride}作用下水相反应,制得了一种新型壳聚糖固载环糊精分子(1),总收率29%,-βCD表观固载量9.5%。1的结构经1H NMR和IR表征。
