检索结果-南通市图书馆

Research on Evacuation Path Planning Based on Improved Sparrow Search Algorithm

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2024年第5期139卷 1295-1316页

作者： xiaoge Wei Yuming Zhang Huaitao Song Hengjie Qin Guanjun Zhao The School of Building Environment Engineering Zhengzhou University of Light IndustryZhengzhou450001China Zhengzhou Key Laboratory of Electric Power Fire Safety Zhengzhou University of Light IndustryZhengzhou450001China Eccom Network System Shanghai201103China

Reducing casualties and property losses through effective evacuation route planning has been a key focus for researchers in recent *** part of this effort,an enhanced sparrow search algorithm(MSSA)was ***,the Golden Sine algorithm and a nonlinear weight factor optimization strategy were added in the discoverer position update stage of the SSA ***,the Cauchy-Gaussian perturbation was applied to the optimal position of the SSA algorithm to improve its ability to jump out of local ***,the local search mechanism based on the mountain climbing method was incorporated into the local search stage of the SSA algorithm,improving its local search *** evaluate the effectiveness of the proposed algorithm,the Whale Algorithm,Gray Wolf Algorithm,Improved Gray Wolf Algorithm,Sparrow Search Algorithm,and MSSA Algorithm were employed to solve various test *** accuracy and convergence speed of each algorithm were then compared and *** results indicate that the MSSA algorithm has superior solving ability and stability compared to other *** further validate the enhanced algorithm’s capabilities for path planning,evacuation experiments were conducted using different maps featuring various obstacle ***,a multi-exit evacuation scenario was constructed according to the actual building environment of a teaching *** the sparrow search algorithm and MSSA algorithm were employed in the simulation experiment for multiexit evacuation path *** findings demonstrate that the MSSA algorithm outperforms the comparison algorithm,showcasing its greater advantages and higher application potential.

关键词： Sparrow search algorithm optimization and improvement function test set evacuation path planning

Joint Optimization of Energy Consumption and Network Latency in Blockchain-Enabled Fog Computing Networks

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Communications 2024年第4期21卷 104-119页

作者： huan. xiaoge Yin Hongbo Cao Bin Wang Yongsheng Chen Qianbin Zhang Jie School of Communications and Information Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China State Key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China School of Communication and Information Engineering University of SheffieldUnited Kingdom

Fog computing is considered as a solution to accommodate the emergence of booming requirements from a large variety of resource-limited Internet of Things(IoT)*** ensure the security of private data,in this paper,we introduce a blockchain-enabled three-layer device-fog-cloud heterogeneous network.A reputation model is proposed to update the credibility of the fog nodes(FN),which is used to select blockchain nodes(BN)from FNs to participate in the consensus *** to the Rivest-Shamir-Adleman(RSA)encryption algorithm applied to the blockchain system,FNs could verify the identity of the node through its public key to avoid malicious ***,to reduce the computation complexity of the consensus algorithms and the network overhead,we propose a dynamic offloading and resource allocation(DORA)algorithm and a reputation-based democratic byzantine fault tolerant(R-DBFT)algorithm to optimize the offloading decisions and decrease the number of BNs in the consensus algorithm while ensuring the network *** results demonstrate that the proposed algorithm could efficiently reduce the network overhead,and obtain a considerable performance improvement compared to the related algorithms in the previous literature.

关键词： blockchain energy consumption fog computing network Internet of Things latency

An Active Deception Defense Model Based on Address Mutation and Fingerprint Camouflage

在线全文

学校读者我要写书评

暂无评论

China Communications 2024年第7期21卷 212-223页

作者： Wang Shuo Chu Jiang Pei Qingqi Shao Feng Yuan Shuai Zhong xiaoge State Key Laboratory of Astronautic Dynamics Xi’an Satellite Control CenterXi’an 710043China State Key Laboratory of Integrated Services Networks Xidian UniversityXi’an 710071China Shaanxi Key Laboratory of Blockchain and Secure Computing Xidian UniversityXi’an 710071China

The static and predictable characteristics of cyber systems give attackers an asymmetric advantage in gathering useful information and launching *** reverse this asymmetric advantage,a new defense idea,called Moving Target Defense(MTD),has been proposed to provide additional selectable measures to complement traditional ***,MTD is unable to defeat the sophisticated attacker with fingerprint tracking *** overcome this limitation,we go one step beyond and show that the combination of MTD and Deception-based Cyber Defense(DCD)can achieve higher performance than either of *** particular,we first introduce and formalize a novel attacker model named Scan and Foothold Attack(SFA)based on cyber kill ***,we develop probabilistic models for SFA defenses to provide a deeper analysis of the theoretical effect under different defense *** models quantify attack success probability and the probability that the attacker will be deceived under various conditions,such as the size of address space,and the number of hosts,attack analysis ***,the experimental results show that the actual defense effect of each strategy almost perfectly follows its probabilistic ***,the defense strategy of combining address mutation and fingerprint camouflage can achieve a better defense effect than the single address mutation.

关键词： address mutation deception defense fingerprint camouflage moving target defense probabilistic model

Enhanced photocatalytic performance of Bi_(2)O_(2)CO_(3)/Bi_(4)O_(5)Br_(2)/reduced graphene oxide Z-schemehe terojunction via a one-pot room-temperature synthesis

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第4期138卷 418-427页

作者： xiaoge Wu Lei Yan Rongrong Qin Qikai Zhang Wei Yang Xiaozhi Wang Yongcai Zhang Min Luo Jianhua Hou College of Environmental Science and Engineering Yangzhou UniversityYangzhouJiangsu 225009China Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization Nanjing 210095China Beijing Xinfeng Aerospace Equipment Co. Ltd.Beijing 100854China Beijing System Design Institute of Electro-Mechanic Engineering Beijing 100005China College of Chemistry and Chemical Engineering Ningxia UniversityYinchuanNingxia 750021China

Bi_(2)O_(2)CO_(3)(BOC)/Bi_(4)O_5Br_(2)(BOB)/reduced graphene oxide(rGO)Z-scheme heterojunction with promising photocatalytic properties was synthesized via a facile one-pot room-temperature ***-thin nanosheets of BOC and BOB were grown in situ on r *** formed 2D/2D direct Z-scheme heterojunction of BOC/BOB with oxygen vacancies(OVs)effectively leads to lower negative electron reduction potential of BOB as well as higher positive hole oxidation potential of BOC,showing improved reduction/oxidation ***,rGO is an acceptor of the electrons from the conduction band of *** dual roles significantly improve the transfer performance of photo-induced charge carriers and accelerate their *** layered nanosheet structure,rich OVs,high specific surface area,and increased utilization efficiency of visible light,the multiple synergistic effects of BOC/BOB/rGO can achieve effective generation and separation of the electron-holes,thereby generating more·O_(2)^(-)and h^(+).The photocatalytic reduction efficiency of CO_(2)to CO(12.91μmol/(g·hr))is three times higher than that of BOC(4.18μmol/(g·hr)).Moreover,it also achieved almost 100%removal of Rhodamine B and cyanobacterial cells within 2 hours.

关键词： Bi_(2)O_(2)CO_(3) Bi_(4)O_(5)Br_(2) Reduced graphene oxide Z-scheme heterojunction Photocatalysis CO_(2)reduction

Co and postseismic fault slip models of the 2022 M_(W)6.7 Menyuan earthquake reveal conjugated faulting tectonics at the central section of the Lenglongling fault

在线全文

学校读者我要写书评

暂无评论

Earthquake Science 2024年第4期37卷 277-303页

作者： Zilong He Wenbin Xu Zhiwei Li Lei Xie Guangcai Feng Nan Fang xiaoge Liu Kai Sun Zhidan Chen Zhihui Zhu School of Geosciences and Info-Physics Central South UniversityChangsha 410083China Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Central South UniversityChangsha 410083China School of Civil Engineering Central South UniversityChangsha 410083China

The 2022 M_(W)6.7 Menyuan earthquake ruptured the western end of the Tianzhu seismic gap,providing an opportunity to study the regional seismogenic characteristics and seismic *** we use interferometric synthetic aperture radar(InSAR)and seismic data to study the mainshock rupture,early afterslip and the second largest aftershock of the 2022 Menyuan earthquake *** modeling results show that the mainshock ruptured the Lenglongling fault and the Tuolaishan fault with a maximum slip of~3 *** postseismic transient deformation occurred at the center of the Lenglongling *** afterslip modeling reveals that the majority of afterslip occurred in the deeper part of the Lenglongling fault.A high-angle conjugated faulting event is found at the middle section of the Lenglongling *** use the stress inversion to investigate the possible triggering mechanism of the conjugated rupture *** results indicate the maximum principal stress direction is in~222°,forming a~22°angle between the conjugated fault of second largest aftershock and the *** calculated normal stress changes indicate the region is within a pull-apart stress field,which favors such a conjugated rupturing *** study will help understand the rupture behavior of such kind of conjugated fault in other regions.

关键词： coseismic displacement and slip postseismic deformation and afterslip conjugate rupture coulomb stress change stress inversion

在线全文

学校读者我要写书评

暂无评论

周代“山”字形铜饰研究

考古 2024年第6期 83-93页

作者：何晓歌北京大学考古文博学院北京市100871

“山”字形铜饰用于周代丧葬活动中,用薄铜片制成,整体形态以“山”字形为主。“山”字形铜饰最早在20世纪50年代发现于三门峡上村岭墓地,发掘者称之为“铜饰”。林已奈夫认为其可能即为《礼记》所载“翣”[2]。

关键词： “山”字形铜饰中高等级墓葬西周晚期至春秋中期“翣”

聚氨酯/纳米ZnO复合改性沥青及其混合料性能研究

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

功能材料 2024年第10期55卷 10071-10077,10101页

作者：田小革高凯李光耀陈功长沙理工大学交通运输工程学院长沙410114

为提升沥青路面的路用性能,选用聚氨酯、纳米ZnO和基质沥青制备聚氨酯/纳米ZnO复合改性沥青。以针入度、软化点、延度和135℃运动黏度为评价指标,研究改性剂对沥青性能的影响,采用软化点差值评价储存稳定性,并制备3种复合改性沥青AC-13... 详细信息

为提升沥青路面的路用性能,选用聚氨酯、纳米ZnO和基质沥青制备聚氨酯/纳米ZnO复合改性沥青。以针入度、软化点、延度和135℃运动黏度为评价指标,研究改性剂对沥青性能的影响,采用软化点差值评价储存稳定性,并制备3种复合改性沥青AC-13C混合料进行车辙试验、小梁弯曲试验和浸水马歇尔试验,研究改性沥青混合料的性能。结果表明,聚氨酯和纳米ZnO的掺入能显著改善基质沥青的高低温性能,且储存稳定性符合规范要求。复合改性沥青混合料能够满足沥青路面的路用性能,5%聚氨酯复配3%纳米ZnO掺量的改性沥青混合料改善高温性能和水稳性能效果最好,与基质沥青混合料相比其动稳定度提高了2.32倍,残留稳定度上升了9.0%,最大弯拉应变(-10℃)提升了8.3%。综合考虑路用性能改善效果,推荐选用5%聚氨酯复配3%纳米ZnO为复合改性沥青及其混合料的最佳掺量。

关键词：沥青混合料聚氨酯纳米ZnO 复合改性沥青路用性能

成年正畸患者颧牙槽嵴区微种植钉植入的位点选择

在线全文

学校读者我要写书评

暂无评论

华西口腔医学杂志 2024年第2期42卷 207-213页

作者：陈芯伊蒋晓鸽陈嵩口腔疾病防治全国重点实验室、国家口腔医学中心、国家口腔疾病临床医学研究中心、四川大学华西口腔医院正畸科成都610041

目的对成年男性及女性正畸患者颧牙槽嵴区的骨皮质密度、骨皮质厚度及颊侧可利用的有效骨量进行分析,为微种植钉植入时的位点选择提供参考。方法采集200例年龄20~30岁患者(男女比例为1∶1)的锥形束CT扫描数据,从近中至远中依次将矢状... 详细信息

目的对成年男性及女性正畸患者颧牙槽嵴区的骨皮质密度、骨皮质厚度及颊侧可利用的有效骨量进行分析,为微种植钉植入时的位点选择提供参考。方法采集200例年龄20~30岁患者(男女比例为1∶1)的锥形束CT扫描数据,从近中至远中依次将矢状面上右侧上颌后牙区分为6个层面,每个层面在垂直距离为颊侧骨皮质距离釉牙骨质界8、10、12 mm处分别设置3个测量位点,共计18个测量位点,测量其骨皮质密度、厚度及有效骨量,并进行统计分析。结果成年男性与女性正畸患者的骨皮质密度、厚度及有效骨量的最高值均位于平分第二前磨牙与第一磨牙根间区,其中骨皮质密度、厚度随着垂直高度增加而增大,而有效骨量随着垂直高度增加而减少。成年男性与女性患者之间的骨皮质密度、骨皮质厚度和颊侧有效骨量存在一定的差异。结论成年男性与女性正畸患者颧牙槽嵴区微种植钉的最佳植入位点均位于第二前磨牙与第一磨牙根间区,其中男性最佳植入位点的垂直高度可以适当高于女性。

关键词：颧牙槽嵴微种植钉骨皮质密度骨皮质厚度有效骨量性别因素

在线全文

学校读者我要写书评

暂无评论

颧牙槽嵴区微种植钉成功率的影响因素

国际口腔医学杂志 2024年第6期51卷 677-686页

作者：蒋佳珍蒋晓鸽陈嵩口腔疾病防治全国重点实验室、国家口腔医学中心、国家口腔疾病临床医学研究中心、四川大学华西口腔医院正畸科成都610041

颧牙槽嵴区皮质骨密度高、骨量大,植入该区的微种植钉具有良好的初期稳定性,能够承担较大的正畸力,实现牙列整体移动。此外,颧牙槽嵴区的微种植钉离磨牙根尖较远,牙根损伤风险小,牙齿移动不受干扰。相对于根间牙槽骨,颧牙槽嵴区是一个... 详细信息

颧牙槽嵴区皮质骨密度高、骨量大,植入该区的微种植钉具有良好的初期稳定性,能够承担较大的正畸力,实现牙列整体移动。此外,颧牙槽嵴区的微种植钉离磨牙根尖较远,牙根损伤风险小,牙齿移动不受干扰。相对于根间牙槽骨,颧牙槽嵴区是一个更理想的微种植钉植入位置,在临床中的应用越来越广。为提高该部位微种植钉植入的成功率,本文从解剖因素、临床因素和患者因素三方面对颧牙槽嵴区微种植钉成功植入的影响因素进行综述,以期提高临床医生对颧牙槽嵴区微种植钉植入的认识,进而提高该支抗的治疗效果。

关键词：颧牙槽嵴微种植钉成功率影响因素