The rapid growth of IoT networks necessitates efficient Intrusion Detection Systems(IDS)capable of addressing dynamic security threats under constrained resource environments.This paper proposes a hybrid IDS for IoT n...The rapid growth of IoT networks necessitates efficient Intrusion Detection Systems(IDS)capable of addressing dynamic security threats under constrained resource environments.This paper proposes a hybrid IDS for IoT networks,integrating Support Vector Machine(SVM)and Genetic Algorithm(GA)for feature selection and parameter optimization.The GA reduces the feature set from 41 to 7,achieving a 30%reduction in overhead while maintaining an attack detection rate of 98.79%.Evaluated on the NSL-KDD dataset,the system demonstrates an accuracy of 97.36%,a recall of 98.42%,and an F1-score of 96.67%,with a low false positive rate of 1.5%.Additionally,it effectively detects critical User-to-Root(U2R)attacks at a rate of 96.2%and Remote-to-Local(R2L)attacks at 95.8%.Performance tests validate the system’s scalability for networks with up to 2000 nodes,with detection latencies of 120 ms at 65%CPU utilization in small-scale deployments and 250 ms at 85%CPU utilization in large-scale scenarios.Parameter sensitivity analysis enhances model robustness,while false positive examination aids in reducing administrative overhead for practical deployment.This IDS offers an effective,scalable,and resource-efficient solution for real-world IoT system security,outperforming traditional approaches.展开更多
The hybridization gap in strained-layer InAs/In_(x)Ga_(1−x) Sb quantum spin Hall insulators(QSHIs)is significantly enhanced compared to binary InAs/GaSb QSHI structures,where the typical indium composition,x,ranges be...The hybridization gap in strained-layer InAs/In_(x)Ga_(1−x) Sb quantum spin Hall insulators(QSHIs)is significantly enhanced compared to binary InAs/GaSb QSHI structures,where the typical indium composition,x,ranges between 0.2 and 0.4.This enhancement prompts a critical question:to what extent can quantum wells(QWs)be strained while still preserving the fundamental QSHI phase?In this study,we demonstrate the controlled molecular beam epitaxial growth of highly strained-layer QWs with an indium composition of x=0.5.These structures possess a substantial compressive strain within the In_(0.5)Ga_(0.5)Sb QW.Detailed crystal structure analyses confirm the exceptional quality of the resulting epitaxial films,indicating coherent lattice structures and the absence of visible dislocations.Transport measurements further reveal that the QSHI phase in InAs/In_(0.5)Ga_(0.5)Sb QWs is robust and protected by time-reversal symmetry.Notably,the edge states in these systems exhibit giant magnetoresistance when subjected to a modest perpendicular magnetic field.This behavior is in agreement with the𝑍2 topological property predicted by the Bernevig–Hughes–Zhang model,confirming the preservation of topologically protected edge transport in the presence of enhanced bulk strain.展开更多
目的分析新生儿脐动脉血气指标与阿普加(Apgar)评分的相关性。方法选取294例新生儿作为研究对象,根据出生1 min Apgar评分不同分为研究组(Apgar评分≤7分,22例)、对照组(Apgar评分8~10分,272例)。比较两组出生1 min Apgar评分、脐动脉...目的分析新生儿脐动脉血气指标与阿普加(Apgar)评分的相关性。方法选取294例新生儿作为研究对象,根据出生1 min Apgar评分不同分为研究组(Apgar评分≤7分,22例)、对照组(Apgar评分8~10分,272例)。比较两组出生1 min Apgar评分、脐动脉血气指标[pH值、血乳酸(Lac)、剩余碱(BE)],采用Pearson相关性分析法分析脐动脉血气指标与Apgar评分的相关性。结果研究组出生1 min Apgar评分(5.78±0.39)分、pH值(7.18±0.16)、BE(-10.14±1.13)mmol/L低于对照组的(8.59±0.41)分、(7.26±0.02)、(-3.24±1.02)mmol/L,Lac(8.46±1.14)mmol/L高于对照组的(5.02±0.21)mmol/L(P<0.05)。Pearson相关性分析结果显示,pH值、BE与出生1 min Apgar评分呈正相关(r=0.607、0.626,P<0.05);Lac与出生1 min Apgar评分呈负相关(r=-0.780,P<0.05)。结论相较于出生1 min Apgar评分8~10分的新生儿,Apgar评分≤7分的新生儿pH值、BE更低,Lac更高,新生儿脐动脉血气指标(pH值、BE、Lac)与Apgar评分关系密切,将脐动脉血气指标与Apgar评分同时应用可为后续开展临床诊疗新生儿窒息工作提供参考。展开更多
文摘The rapid growth of IoT networks necessitates efficient Intrusion Detection Systems(IDS)capable of addressing dynamic security threats under constrained resource environments.This paper proposes a hybrid IDS for IoT networks,integrating Support Vector Machine(SVM)and Genetic Algorithm(GA)for feature selection and parameter optimization.The GA reduces the feature set from 41 to 7,achieving a 30%reduction in overhead while maintaining an attack detection rate of 98.79%.Evaluated on the NSL-KDD dataset,the system demonstrates an accuracy of 97.36%,a recall of 98.42%,and an F1-score of 96.67%,with a low false positive rate of 1.5%.Additionally,it effectively detects critical User-to-Root(U2R)attacks at a rate of 96.2%and Remote-to-Local(R2L)attacks at 95.8%.Performance tests validate the system’s scalability for networks with up to 2000 nodes,with detection latencies of 120 ms at 65%CPU utilization in small-scale deployments and 250 ms at 85%CPU utilization in large-scale scenarios.Parameter sensitivity analysis enhances model robustness,while false positive examination aids in reducing administrative overhead for practical deployment.This IDS offers an effective,scalable,and resource-efficient solution for real-world IoT system security,outperforming traditional approaches.
基金supported by the Strategic Priority Research Program of Chinese Academy of Sciences (Grant Nos.XDB28000000 and XDB0460000)the Quantum Science and Technology-National Science and Technology Major Project (Grant No.2021ZD0302600)the National Key Research and Development Program of China(Grant No.2024YFA1409002)。
文摘The hybridization gap in strained-layer InAs/In_(x)Ga_(1−x) Sb quantum spin Hall insulators(QSHIs)is significantly enhanced compared to binary InAs/GaSb QSHI structures,where the typical indium composition,x,ranges between 0.2 and 0.4.This enhancement prompts a critical question:to what extent can quantum wells(QWs)be strained while still preserving the fundamental QSHI phase?In this study,we demonstrate the controlled molecular beam epitaxial growth of highly strained-layer QWs with an indium composition of x=0.5.These structures possess a substantial compressive strain within the In_(0.5)Ga_(0.5)Sb QW.Detailed crystal structure analyses confirm the exceptional quality of the resulting epitaxial films,indicating coherent lattice structures and the absence of visible dislocations.Transport measurements further reveal that the QSHI phase in InAs/In_(0.5)Ga_(0.5)Sb QWs is robust and protected by time-reversal symmetry.Notably,the edge states in these systems exhibit giant magnetoresistance when subjected to a modest perpendicular magnetic field.This behavior is in agreement with the𝑍2 topological property predicted by the Bernevig–Hughes–Zhang model,confirming the preservation of topologically protected edge transport in the presence of enhanced bulk strain.
文摘目的分析新生儿脐动脉血气指标与阿普加(Apgar)评分的相关性。方法选取294例新生儿作为研究对象,根据出生1 min Apgar评分不同分为研究组(Apgar评分≤7分,22例)、对照组(Apgar评分8~10分,272例)。比较两组出生1 min Apgar评分、脐动脉血气指标[pH值、血乳酸(Lac)、剩余碱(BE)],采用Pearson相关性分析法分析脐动脉血气指标与Apgar评分的相关性。结果研究组出生1 min Apgar评分(5.78±0.39)分、pH值(7.18±0.16)、BE(-10.14±1.13)mmol/L低于对照组的(8.59±0.41)分、(7.26±0.02)、(-3.24±1.02)mmol/L,Lac(8.46±1.14)mmol/L高于对照组的(5.02±0.21)mmol/L(P<0.05)。Pearson相关性分析结果显示,pH值、BE与出生1 min Apgar评分呈正相关(r=0.607、0.626,P<0.05);Lac与出生1 min Apgar评分呈负相关(r=-0.780,P<0.05)。结论相较于出生1 min Apgar评分8~10分的新生儿,Apgar评分≤7分的新生儿pH值、BE更低,Lac更高,新生儿脐动脉血气指标(pH值、BE、Lac)与Apgar评分关系密切,将脐动脉血气指标与Apgar评分同时应用可为后续开展临床诊疗新生儿窒息工作提供参考。
