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基于鲁棒交叉熵与梯度优化的安全强化学习方法

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软件导刊 2024年第9期23卷 143-149页

作者：周娴玮张锟叶鑫华南师范大学软件学院广东佛山538200

智能体在复杂环境下执行任务时,如何保证安全性和效率性是一个很大的难题。传统强化学习方法解决智能体决策问题时采用无模型的强化学习,利用大量数据不断试错寻找最优策略,忽略了智能体的训练成本和安全风险,因此无法有效保证决策的安... 详细信息

智能体在复杂环境下执行任务时,如何保证安全性和效率性是一个很大的难题。传统强化学习方法解决智能体决策问题时采用无模型的强化学习,利用大量数据不断试错寻找最优策略,忽略了智能体的训练成本和安全风险,因此无法有效保证决策的安全性。为此,在模型预测控制框架下对智能体动作添加安全约束条件,设计安全强化学习算法获得最安全的动作控制序列。同时,针对交叉熵方法存在计算量大与效率低、梯度优化方法存在着陷入局部最优的问题,结合鲁棒交叉熵与梯度优化方法优化动作控制序列,以提升算法安全性和求解效率。实验表明,所提方法相较于鲁棒交叉熵法能有效提升收敛速度,相较于其他优化算法在不损失较多性能的前提下安全性能最优。

关键词：强化学习鲁棒交叉熵梯度优化安全性

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武陵山区青少年危害健康行为潜在类别及与学校联结的关联

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中国学校卫生 2024年第4期45卷 509-513页

作者：张天成周县委徐涛张福兰王澳伦吉首大学体育科学学院湖南416000 广西师范大学体育与健康学院

目的了解武陵山区青少年危害健康行为潜在类别及其与学校联结的关联,为制定分类高效干预措施提供参考。方法于2023年3—6月,运用多阶段分层整群随机抽样法抽取武陵山区8所学校的3386名初、高中学生为调查对象,采用基本信息问卷、危害健... 详细信息

目的了解武陵山区青少年危害健康行为潜在类别及其与学校联结的关联,为制定分类高效干预措施提供参考。方法于2023年3—6月,运用多阶段分层整群随机抽样法抽取武陵山区8所学校的3386名初、高中学生为调查对象,采用基本信息问卷、危害健康行为问卷、学校联结量表进行调查。采用潜在类别分析探究武陵山区青少年危害健康行为的潜在类别,运用无序多分类Logistic回归模型分析潜在类别与学校联结的关联。结果武陵山区青少年危害健康行为可分为外显行为高风险组(5.64%)、内隐行为高风险组(26.90%)、低风险组(67.45%)3个潜在类别;不同性别、民族、家庭类型的青少年在外显行为高风险组、内隐行为高风险组和低风险组3个潜在类别组的分布差异均有统计学意义(χ^(2)值分别为117.91,22.55,21.51,P值均<0.05);无序多分类Logistic回归模型分析结果显示,以低风险组为参照,学校联结得分高与外显行为高风险组(OR=0.89,95%CI=0.88~0.91)和内隐行为高风险组(OR=0.90,95%CI=0.89~0.91)均呈负相关(P值均<0.05)。结论武陵山区青少年危害健康行为类别特征明显,外显行为高风险组、内隐行为高风险组均与学校联结存在负向关联。应积极采取相应措施,提高青少年学校归属感,降低危害健康行为的聚集共存状况。

关键词：危险行为学校联结回归分析青少年

陈氏盆乐汤对产后盆底功能障碍性疾病盆底肌力及尿流动力学状态的影响

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中华中医药杂志 2024年第8期39卷 4474-4478页

作者：胡凤英周先韦金丽华陈学奇浙江中医药大学附属第二医院杭州310005 浙江中医药大学附属第三医院杭州310009

目的:分析陈氏盆乐汤对产后盆底功能障碍性疾病(PFD)患者盆底肌力及尿流动力学状态的影响。方法:选取2018年1月至2019年10月收治的PFD患者116例,采用随机数表法分为观察组、对照组,各58例,对照组予以电刺激联合生物反馈盆底肌肉锻炼,观... 详细信息

目的:分析陈氏盆乐汤对产后盆底功能障碍性疾病(PFD)患者盆底肌力及尿流动力学状态的影响。方法:选取2018年1月至2019年10月收治的PFD患者116例,采用随机数表法分为观察组、对照组,各58例,对照组予以电刺激联合生物反馈盆底肌肉锻炼,观察组予以陈氏盆乐汤联合盆底肌肉锻炼,均治疗8周,对比两组治疗前后、产后6个月与12个月时盆底功能影响问卷(PFDI-20)、盆腔脏器脱垂/尿失禁性功能问卷(PISQ-12)、盆腔器官脱垂量表(POP-Q),盆底三维超声检测膀胱颈至耻骨联合下缘的垂直间距(BSD)、膀胱尿道后角(PUVA)、膀胱颈移动度(UVJ-M),生物刺激反馈仪测定盆底肌肉肌力、肌肉疲劳度,记录不良反应。结果:治疗8周后及产后6、12个月两组PFDI-20评分、POP-Q评分均较治疗前下降(P<0.05),而PISQ-12评分(除对照组治疗8周后)增加(P<0.05),且观察组PFDI-20评分、POP-Q评分低于对照组(P<0.05),而PISQ-12评分高于对照组(P<0.05);产后两组BSD、PUVA、UVJ-M(除对照组治疗8周后)均发生明显变化,且观察组治疗8周后及产后6、12个月BSD高于对照组(P<0.05),而PUVA、UVJ-M低于对照组(P<0.05);观察组产后6、12个月Ⅰ~Ⅲ级的Ⅰ类肌纤维、Ⅱ类肌纤维盆底肌电活动值大于对照组(P<0.05),而盆底肌疲劳值低于对照组(P<0.05);两组均未见明显不良反应。结论:陈氏盆乐汤可明显改善产后PFD患者盆底肌力、尿流动力学,减少盆底肌疲劳,提高其生活质量,安全可靠,值得在临床推广实践。

关键词：陈氏盆乐汤产后盆底功能障碍性疾病盆底肌力尿流动力学

A Stackelberg Differential Game Based Bandwidth Allocation in Satellite Communication Network

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China Communications 2018年第8期15卷 205-214页

作者： Jingtao Su Shengsong Yang Haitao Xu xianwei zhou School of Computer and Communication Engineering University of Science and Technology Beijing

In this paper, a Stackelberg differential game based approach is proposed to solve the bandwidth allocation problems in satellite communication network. All the satellites are divided into two groups, one has high download requirements, and the other one has low download requirements. Each satellites group has its own controller for bandwidth allocation, and can get payments from the satellites for the allocated resources. The relationships between the controllers and satellites are formed as a Stackelberg game. In our model, differential equation is introduced to describe the bandwidth dynamics for the whole satellite communication network. Combine the differential equation and Stackelberg game together, we can formulate the bandwidth allocation problems in satellite communication network as a Stackelber differential game. The solutions to the proposed game is solved based the Bellman dynamic equations. Numerical simulations are given to prove the effeteness and correctness of the proposed approach.

关键词： stackelberg equilibrium bandwidth allocation differential game satellite communication networks

Big Data Security and Privacy： A Review

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China Communications 2014年第A2期11卷 135-145页

作者： MATTURDI Bardi zhou xianwei LI Shuai LIN Fuhong School of Mathematics and Information Hotan Teachers College Hetian 848000 Xinjiang P. R. China School of Computer and Communication Engineering University of Science and Technology B eijing Beijing 100083 P. R. China

While Big Data gradually become a hot topic of research and business and has been everywhere used in many industries, Big Data security and privacy has been increasingly concerned. However, there is an obvious contradiction between Big Data security and privacy and the widespread use of Big Data. In this paper, we firstly reviewed the enormous benefits and challenges of security and privacy in Big Data. Then, we present some possible methods and techniques to ensure Big Data security and privacy.

关键词： big data value of big data security and privacy

Towards green for relay in InterPlaNetary Internet based on differential game model

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Science China(Information Sciences) 2014年第4期57卷 65-73页

作者： LIN FuHong LIU Qian zhou xianwei XIONG Ke School of Computer and Communication Engineering University of Science and Technology Beijing School of Computer and Information Technology Beijing Jiaotong University State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University

InterPlaNetary Internet(IPN)plays a very important role in the exploitation of ***,the relays in IPN are suffered from high symbol error,limited storage space,and limited available *** analyze the performance of the relay in IPN,in this article,we build a differential game model,where the controller is transmitting rate,and the goal is to maximize the payoff according to the symbol error rate,the storage space and the available energy in the *** such a design,the green relays can be achieved for IPNs,which could prolong the live of the *** the model is not easy to discuss,we analyze it using the Bellman theorem and then get some formulas on the trace of the optimal transmitting ***,extensive simulation results are presented to demonstrate the performance of our proposed model,which shows that by using our derived optimal transmitting rate trace,the relay’s payoff can be maximized.

关键词： IPN differential game symbol error limited storage space energy efficiency

Steiner Tree Based Optimal Resource Caching Scheme in Fog Computing

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China Communications 2015年第8期12卷 161-168页

作者： SU Jingtao LIN Fuhong zhou xianwei Lü Xing School of Computer and Communication Engineering University of Science and Technology Beijing School of Science Beijing Jiaotong University

Fog Computing is a new platform that can serve mobile devices in the local area. In Fog Computing, the resources need to be shared or cached in the widely deployed Fog clusters. In this paper, we propose a Steiner tree based caching scheme, in which the Fog servers, when caching resources, first produce a Steiner tree to minimize the total path weight(or cost) such that the cost of resource caching using this tree could be minimized. Then we give a running illustration to show how the Fog Computing works and we compare the traditional shortest path scheme with the proposed one. The outcome shows that the Steiner tree based scheme could work more efficiently.

关键词： steiner Tree resource caching fogcomputing architecture

Differential Game Based Link Resource Management for Next Generation Optical Network

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China Communications 2017年第9期14卷 72-79页

作者： Haitao Xu Yuqiong Cao Shengsong Yang xianwei zhou School of Computer and Communication Engineering University of Science and Technology Beijing China Academy of Information and Communications Technology

In this paper, we investigate the link resource management problem for optical networks, to achieve the resource cost during the information transmission. We use the differential game to formulate the cost control problem for the link resource management, to minimize the resource allocation cost functions, which dynamic behaviours are described by differential equations. Each link controls its transmission bandwidth based on the Nash equilibriums of the differential game. The effectiveness of the proposed model is given through numerical simulations.

关键词： optical network resource man-agement non-cooperative game differential Nash equilibrium

Grey-theory based intrusion detection model

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Journal of Systems Engineering and Electronics 2006年第1期17卷 230-235页

作者： Qin Boping zhou xianwei Yang Jun Song Cunyi School of Information Engineering Univ. of Science and Technology Beijing Beijing 100083 P. R. China

To solve the problem that current intrusion detection model needs large-scale data in formulating the model in real-time use, an intrusion detection system model based on grey theory （GTIDS） is presented. Grey theory has merits of fewer requirements on original data scale, less limitation of the distribution pattern and simpler algorithm in modeling. With these merits GTIDS constructs model according to partial time sequence for rapid detect on intrusive act in secure system. In this detection model rate of false drop and false retrieval are effectively reduced through twice modeling and repeated detect on target data. Furthermore, GTIDS framework and specific process of modeling algorithm are presented. The affectivity of GTIDS is proved through emulated experiments comparing snort and next-generation intrusion detection expert system （NIDES） in SRI international.

关键词： network security intrusion detection grey theory model.