数字经济的发展使得数据体量增长急剧加速,数据安全也成为了当前社会中重要的关注点。为了保护数据隐私安全,不经意随机访问机(ORAM,Oblivious Random Access Machine)方案被提出来保护不可信内存中的访问模式。本文提出一种全新的ORAM...数字经济的发展使得数据体量增长急剧加速,数据安全也成为了当前社会中重要的关注点。为了保护数据隐私安全,不经意随机访问机(ORAM,Oblivious Random Access Machine)方案被提出来保护不可信内存中的访问模式。本文提出一种全新的ORAM协议,与以往只能存储固定长度分块的方案不同,本文提出的方案支持存储不同长度的数据,以更高的效率保证攻击者无法通过观察访问推测出隐私信息。该方案重塑了初始的二叉树结构,并采用加法同态加密方案来实现恒定的通信复杂性。该方案通过可变长度数据提升了多项性能,对于小型客户端存储,该ORAM协议的网络带宽比RingORAM低30%,比HIRBORAM低40%。同时,该ORAM协议极大地节省了客户端计算开销,并利用第三方(可信代理)提高了存储容量。最后证明了本方案过程中读取、写入以及驱逐操作的安全性。展开更多
Objective:To select the appropriate concentrations of methanolic pomegranate extract supplemented in rams’semen extender for obtaining the best-cryopreserved semen quality.Methods:Tris-based semen extender was supple...Objective:To select the appropriate concentrations of methanolic pomegranate extract supplemented in rams’semen extender for obtaining the best-cryopreserved semen quality.Methods:Tris-based semen extender was supplemented with 0.0,0.40,0.48,and 0.56 mg/mL pomegranate peel methanolic extract to extend semen collected from five native rams twice weekly for two months(n=80).Pooled(n=16)post-thaw semen characteristics were determined.Thawed seminal plasma of all supplemented and control groups were used to measure malondialdehyde(MDA),nitric oxide(NO),glutathione peroxidase(GPx),superoxide dismutase(SOD),ascorbic acid,zinc,copper,total cholesterol,low-density lipoproteins(LDL),lactate dehydrogenase(LDH),and alkaline phosphatase(ALP).Results:The supplementation of Tris-based semen extender with 0.48 mg/mL semen extender resulted in the highest post-thaw sperm total motility(P<0.001),sperm progressive motility(P<0.001),live sperm(P<0.001),sperm plasma membrane integrity(P<0.001),acrosome integrity(P<0.001),SOD(P<0.05),zinc(P<0.001),total cholesterol(P<0.001),and LDL(P<0.001)with the lowest percentage of abnormal sperm morphology(P<0.001),the lowest lipid peroxidation(MDA,P<0.01),ascorbic acid(P>0.05),and LDH(P>0.05).Conclusions:Pomegranate peel methanolic extract 0.48 mg/mL supplemented to Tris-based semen extender of rams is the best enrichment in preserving the sperm post-thaw characteristics via improving biochemical profiles and antioxidant capacity.展开更多
文摘数字经济的发展使得数据体量增长急剧加速,数据安全也成为了当前社会中重要的关注点。为了保护数据隐私安全,不经意随机访问机(ORAM,Oblivious Random Access Machine)方案被提出来保护不可信内存中的访问模式。本文提出一种全新的ORAM协议,与以往只能存储固定长度分块的方案不同,本文提出的方案支持存储不同长度的数据,以更高的效率保证攻击者无法通过观察访问推测出隐私信息。该方案重塑了初始的二叉树结构,并采用加法同态加密方案来实现恒定的通信复杂性。该方案通过可变长度数据提升了多项性能,对于小型客户端存储,该ORAM协议的网络带宽比RingORAM低30%,比HIRBORAM低40%。同时,该ORAM协议极大地节省了客户端计算开销,并利用第三方(可信代理)提高了存储容量。最后证明了本方案过程中读取、写入以及驱逐操作的安全性。
文摘Objective:To select the appropriate concentrations of methanolic pomegranate extract supplemented in rams’semen extender for obtaining the best-cryopreserved semen quality.Methods:Tris-based semen extender was supplemented with 0.0,0.40,0.48,and 0.56 mg/mL pomegranate peel methanolic extract to extend semen collected from five native rams twice weekly for two months(n=80).Pooled(n=16)post-thaw semen characteristics were determined.Thawed seminal plasma of all supplemented and control groups were used to measure malondialdehyde(MDA),nitric oxide(NO),glutathione peroxidase(GPx),superoxide dismutase(SOD),ascorbic acid,zinc,copper,total cholesterol,low-density lipoproteins(LDL),lactate dehydrogenase(LDH),and alkaline phosphatase(ALP).Results:The supplementation of Tris-based semen extender with 0.48 mg/mL semen extender resulted in the highest post-thaw sperm total motility(P<0.001),sperm progressive motility(P<0.001),live sperm(P<0.001),sperm plasma membrane integrity(P<0.001),acrosome integrity(P<0.001),SOD(P<0.05),zinc(P<0.001),total cholesterol(P<0.001),and LDL(P<0.001)with the lowest percentage of abnormal sperm morphology(P<0.001),the lowest lipid peroxidation(MDA,P<0.01),ascorbic acid(P>0.05),and LDH(P>0.05).Conclusions:Pomegranate peel methanolic extract 0.48 mg/mL supplemented to Tris-based semen extender of rams is the best enrichment in preserving the sperm post-thaw characteristics via improving biochemical profiles and antioxidant capacity.
