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Integrated intrusion detection model based on artificial immune

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The Journal of China Universities of Posts and Telecommunications 2014年第2期21卷 83-90页

作者： zha.g Ling BAI Zhong-ying LU Yun-long zha ya.xing LI Zhen-wen School of Computer Science Beijing University of Posts and Telecommunications Zhengzhou University of Light Industry

The author puts forward an integrated intrusion detection （ID） model based on artificial immune （IIDAI）, a vaccination strategy based on the significance degree of genes and a method to generate initial memory antibodies with rough set （RS）. IIDAI integrates two kinds of intrusion detection mode： misuse detection and anonymous detection. Misuse detection and anonymous detection are applied to detect the known and the unknown attacks, respectively. On the basis of IIDAI model, an ID algorithm is presented. Simulation shows that the IIDAI has better performance than traditional ID methods in feasibility and effectiveness. It is very prone to achieve a higher convergence rate by using the vaccination strategy. Moreover, RS can remove the redundancy attributes and increase the detection speed. It can also increase detection rate by applying the integrated method.

关键词： ID RS artificial immune vaccination

Temporal pulsed x-ray response of CdZnTe:In detector

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Chinese Physics B 2018年第12期27卷 450-454页

作者： Rong-Rong guo ya.Dong Xu gang-Qiang zha Tao Wang Wan-Qi Jie School of Optoelectronic and Communication Engineering Xiamen University of Technology State Key Laboratory of Solidification Processing Northwestern Polytechnical University (NWPU)

The temporal response of cadmium-zinc-telluride(CZT) crystals is evaluated at room temperature by using an ultrafast-pulsed x-ray source. The dynamics of carrier relaxation in a CZT single crystal is modeled at a microscopic level based on a multi-trapping effect. The effects of the irradiation flux and bias voltage on the amplitude and full width at half maximum(FWHM) of the transient currents are investigated. It is demonstrated that the temporal response process is affected by defect level occupation fraction. A fast photon current can be achieved under intense pulsed x-ray irradiation to be up to 2.78×10~9 photons mm-2·s-1. Meanwhile, it is found that high bias voltage could enhance carrier detrapping by suppressing the capture of structure defects and thus improve the temporal response of CZT detectors.

关键词： CdZnTe ultrafast-pulsed x-rays transient current charge carrier

Acute appendicitis in the short term following radical total gastrectomy misdiagnosed as duodenal stump leakage:A case report

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World Journal of gastrointestinal Surgery 2022年第12期14卷 1432-1437页

作者： Jun Ma Zhen-Ping zha Chao-Ping Zhou Xiang Miao Shu-Qiang Duan ya.Ming zha.g Department of general Surgery Anqing Municipal HospitalAnqing 246000Anhui ProvinceChina Department of Vascular Surgery Anqing Municipal HospitalAnqing 246000Anhui ProvinceChina Department of Pathology Anqing Municipal HospitalAnqing 246000Anhui ProvinceChina

BACKgROUND Common diseases after radical gastrectomy include cholecystitis and pancreatitis,but the sudden onset of acute appendicitis in a short period following radical gastrectomy is very rare,and its clinical symptoms are easily misdiagnosed as duodenal stump *** SUMMARY This is a case report of a 77-year-old woman with lower right abdominal pain 14 d after radical resection of gastric *** pain was not relieved by conservative treatment,and her inflammatory markers were *** tomography showed effusion in the perihepatic and hepatorenal spaces,right paracolic sulcus and pelvis,as well as exudative changes in the right iliac *** puncture revealed a slightly turbid yellow-green *** exploration showed a swollen appendix with surrounding pus moss and no abnormalities of the digestive anastomosis or stump;thus,laparoscopic appendectomy was *** patient recovered well after the *** pathology showed acute purulent *** patient continued adjuvant chemotherapy after surgery,completing three cycles of oxaliplatin plus S-1(SOX regimen).CONCLUSION Acute appendicitis in the short term after radical gastrectomy needs to be differentiated from duodenal stump leakage,and early diagnosis and surgery are the most important means of treatment.

关键词： gastric cancer Acute appendicitis Surgery Complications Case report

Sliding mode control of solid state transformer using a three-level hysteresis function

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Journal of Central South University 2016年第8期23卷 2063-2074页

作者：刘宝龙査亚兵张涛 College of Information System and Management National University of Defense Technology State Key Laboratory of High Performance Computing National University of Defense Technology

The solid state transformer(SST) can be viewed as an energy router in energy internet. This work presents sliding mode control(SMC) to improve dynamic state and steady state performance of a three-stage(rectifier stage, isolated stage and inverter stage) SST for energy internet. SMC with three-level hysteresis sliding functions is presented to control the input current of rectifier stage and output voltage of inverter stage to improve the robustness under external disturbance and parametric uncertainties and reduce the switching frequency. A modified feedback linearization technique using isolated stage simplified model is presented to achieve satisfactory regulation of output voltage of the isolated stage. The system is tested for steady state operation, reactive power control, dynamic load change and voltage sag simulations, respectively. The switching model of SST is implemented in Matlab/ Simulink to verify the SST control algorithms.

关键词： solid state transformer(SST) energy internet sliding mode control(SMC) feedback linearization three-level hysteresis

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基于网格的先进分布式仿真综述

系统仿真学报 2008年第5期20卷 1089-1093,1106页

作者：张卫查亚兵国防科技大学机电工程与自动化学院湖南长沙410073

当前的先进分布式仿真技术部分解决了模型的互操作和重用问题,但是它在支持强健的系统性能、仿真资源管理和仿真活动协作方面存在缺陷。网格技术支持动态异构环境、资源的优化管理和强健的系统性能,将网格技术应用于先进分布式仿真领域... 详细信息

当前的先进分布式仿真技术部分解决了模型的互操作和重用问题,但是它在支持强健的系统性能、仿真资源管理和仿真活动协作方面存在缺陷。网格技术支持动态异构环境、资源的优化管理和强健的系统性能,将网格技术应用于先进分布式仿真领域能够弥补现有先进分布式仿真技术存在的这些缺陷。该文提出了基于网格的先进分布式仿真,从仿真系统性能增强、仿真资源管理、仿真技术集成与机构协作、以及仿真网格四个方面综述了相关的研究成果,在仿真资源管理中提出了一种仿真资源分类方法,接着概述了基于网格的先进分布式仿真技术在国防军事、工业、生物医学和环境等方面的应用现状,最后展望了发展方向。

关键词：先进分布式仿真网格基于网格的先进分布式仿真高层体系结构

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基于移动agent的联邦成员迁移机制

系统仿真学报 2008年第12期20卷 3171-3174,3195页

作者：张卫查亚兵国防科技大学机电工程与自动化学院湖南长沙410073

高层体系结构为建模和仿真提供了一个通用的技术框架,它能够简化仿真应用的互操作性,改进仿真组件的重用性。然而,基于高层体系结构的大规模仿真系统通常分布于网络之中,随着仿真系统的执行主机负载不平衡经常发生,高层体系结构并没有... 详细信息

高层体系结构为建模和仿真提供了一个通用的技术框架,它能够简化仿真应用的互操作性,改进仿真组件的重用性。然而,基于高层体系结构的大规模仿真系统通常分布于网络之中,随着仿真系统的执行主机负载不平衡经常发生,高层体系结构并没有提供相应的机制以实现主机负载的平衡。实现主机负载平衡的根本方法就是将负载从负载较重的节点迁移到负载较轻的节点,进程迁移就是这样一种通用的问题求解方法。提出了一种基于移动agent的联邦成员迁移机制,它通过将移动agent的移动性结合到联邦成员实现了联邦成员的移动性,这样联邦成员就能够在网络上实现迁移。实验显示,此方法能够有效地实现诸如空地攻防对抗类仿真联邦成员的迁移,但对于交互密集型的仿真应用无法确保消息不丢失或重复,需要进一步研究。

关键词：高层体系结构联邦成员迁移移动agent 负载平衡

Damage Tolerance Design of Artificial Mechanical Heart Valve Holder

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Chinese Journal of Biomedical Engineering(English Edition) 2022年第1期31卷 1-12页

作者： zha.g Jian-hui zha Xiao WANg Li-ya School of Mechanical Engineering Hangzhou Dianzi UniversityHangzhou 310018China

To study the conservative life of the artificial mechanical heart valve holder,CATIA software was used for modeling,and ABAQUS finite element analysis was used to analyze the stress of the valve holder in the complex environment of the human body and the residual thermal stress during production and *** damage tolerance method based on fracture mechanics analyzes the maximum initial crack size that the heart valve holder can tolerate under the premise that the structural safety life is longer than the life of the implanted *** results show that the maximum initial crack size is only tens of microns;the traditional S/N life analysis can only obtain non-conservative life,and the damage tolerance method is the basic requirement for analyzing the life and quality control of artificial mechanical heart valves.

关键词： artificial heart valve ABAQUS S/N life analysis damage tolerance maximum initial crack

Acupuncture for cervical dystonia associated with anxiety and depression: A case report

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World Journal of Clinical Cases 2024年第1期12卷 204-209页

作者： ya.Ting zha.g Jin-Jing zha.g Bi-Xiang zha Yin-Qiu Fan Yuan-Bo Xu Jun ya.g Qing-Ping zha.g The First School of Clinical Medicine Anhui University of Chinese MedicineHefei 230031Anhui ProvinceChina Acupuncture and Rehabilitation Department First Affiliated Hospital of Anhui University of Chinese MedicineHefei 230031Anhui ProvinceChina College of Acupuncture and Tuina Anhui University of Chinese MedicineHefei 230031Anhui ProvinceChina

BACKgROUND Cervical dystonia(CD)is a type of muscle tone disorder that usually occurs in the neck *** to the intermittent or continuous involuntary contraction of the neck muscles,the head and neck are twisted and skewed and some postural abnormalities ***-term abnormal posture or pain can cause negative emotions in patients,which can affect their quality of *** SUMMARY This case report included a 37-year-old woman who was diagnosed with CD associated with anxiety and depression;the accompanying symptoms were head and neck tilt of approximately 90°to the right and mental *** two courses of acupuncture treatment,the patient’s head and neck can be maintained in a normal position,and the negative emotions can be *** This case indicates that acupuncture can effectively improve CD and the emotional state and quality of life of patients,making it an effective alternative treatment for the condition.

关键词： Cervical dystonia Anxiety and depression Neurological disease Acupuncture Case report

Evaluation of Forest Damaged Area and Severity Caused by Ice-snow Frozen Disasters over Southern China with Remote Sensing

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Chinese geographical Science 2019年第3期29卷 405-416页

作者： WANg Xuecheng ya.g Fei gAO Xing WANg Wei zha Xinjie Institute of geographic Sciences and Natural Resources Research Chinese Academy of Sciences State Key Laboratory of Resources and Environmental Information System University of Chinese Academy of Sciences Jiangsu Center for Collaborative Innovation in geographical Information Resource Development and Application

The accurate assessment of forest damage is important basis for the forest post-disaster recovery process and ecosystem management. This study evaluates the spatial distribution of damaged forest and its damaged severity caused by ice-snow disaster that occurred in southern China during January 10 to February 2 in 2008. The moderate-resolution imaging spectroradiometer(MODIS)13 Q1 products are used, which include two vegetation indices data of NDVI(Normalized Difference Vegetation Index) and EVI(Enhanced Vegetation Index). Furtherly, after Quality Screening(QS) and Savizky-golay(S-g) filtering of MODIS 13 Q1 data, four evaluation indices are obtained, which are NDVI with QS(QSNDVI), EVI with QS(QSEVI), NDVI with S-g filtering(SgNDVI) and EVI with S-g filtering(SgEVI). The study provides a new way of firstly determining the threshold for each image pixel for damaged forest evaluation, by computing the pre-disaster reference value and change threshold with vegetation index from remote sensing data. Results show obvious improvement with the new way for forest damage evaluation, evaluation result of forest damage is much close to the field survey data with standard error of only 0.95 and 1/3 less than the result that evaluated from other threshold method. Comparatively, the QSNDVI shows better performance than other three indices on evaluating forest damages. The evaluated result with QSNDVI shows that the severe, moderate, mild damaged rates of Southern China forests are 47.33%, 34.15%, 18.52%, respectively. By analyzing the influence of topographic and meteorological factors on forest-vegetation damage, we found that the precipitation on freezing days has greater impact on forest-vegetation damage, which is regarded as the most important factor. This study could be a scientific and reliable reference for evaluating the forest damages from ice-snow frozen disasters.

关键词： ice-snow disaster vegetation index forest remote sensing southern China