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An Adaptive Push-Styled Command and Control Mechanism in Mobile Botnets

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Wuhan University Journal of Natural Sciences 2013年第5期18卷 427-434页

作者： CHEN Wei GONG Peihua YU Le yang geng College of Computer Nanjing University of Posts and Telecommunications

The mobile botnet, developed from the traditional PC-based botnets, has become a practical underlying trend. In this paper, we design a mobile botnet, which exploits a novel command and control （CC） strategy named Push-Styled CC. It utilizes Google cloud messaging （GCM） service as the botnet channel. Compared with traditional botnet, Push-Styled CC avoids direct communications between botmasters and bots, which makes mobile botnets more stealthy and resilient. Since mobile devices users are sensitive to battery power and traffic consumption, Push- Styled botnet also applies adaptive network connection strategy to reduce traffic consumption and cost. To prove the efficacy of our design, we implemented the prototype of Push-Style CC in Android. The experiment results show that botnet traffic can be concealed in legal GCM traffic with low traffic cost.

关键词： mobile botnet push style Google cloud messaging (GCM) adaptive connection

基于脂肪可塑性研究大黄素对肥胖小鼠的改善作用和机制

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中草药 2024年第4期55卷 1228-1236页

作者：冯倩倩贺润铖张磊耿杨赵子阳史浩男贾占红张硕峰孙建宁董世芬北京中医药大学中药学院中药药理系北京102488

目的基于脂肪可塑性探究大黄素改善肥胖的作用和机制。方法通过高脂饲养8周建立肥胖小鼠模型,肥胖小鼠随机分为对照组、模型组、大黄素(40、80 mg/kg)组、CL316243(1 mg/kg)组和罗格列酮(10 mg/kg)组,连续给药4周。测量各组小鼠体质量,... 详细信息

目的基于脂肪可塑性探究大黄素改善肥胖的作用和机制。方法通过高脂饲养8周建立肥胖小鼠模型,肥胖小鼠随机分为对照组、模型组、大黄素(40、80 mg/kg)组、CL316243(1 mg/kg)组和罗格列酮(10 mg/kg)组,连续给药4周。测量各组小鼠体质量,检测Lee’s指数和皮下腹股沟白色脂肪组织(inguinal white adipose tissue,iWAT)、附睾白色脂肪组织(epididymal white adipose tissue,eWAT)、肾周白色脂肪组织(perirenal white adipose tissue,pWAT)、肩胛区棕色脂肪组织(brown adipose tissue,BAT)指数,测量肩胛骨体温;检测口服葡萄糖耐受量、血糖曲线下面积(area under curve,AUC)及血清中总胆固醇(total cholesterol,TC)、三酰甘油(triglyceride,TG)、低密度脂蛋白胆固醇(low density lipoprotein cholesterol,LDL-C)、高密度脂蛋白胆固醇(high density lipoprotein cholesterol,HDL-C)水平;采用苏木素-伊红(HE)染色观察脂肪组织病理变化;免疫组化法检测脂肪组织中棕色化相关蛋白解偶联蛋白1(uncoupling protein 1,UCP1)表达;Western blotting检测皮下iWAT中脂肪可塑性相关蛋白葡萄糖转运蛋白4(glucose transporter 4,GLUT4)、过氧化物酶体增殖物激活受体γ共激活剂-1α(peroxisome proliferator-activated receptor-gamma coactivator-1α,PGC-1α)、PR结构域蛋白16(positive regulatory domain-containing 16,PRDM16)、线粒体转录因子A(mitochondrial transcription factor A,TFAM)、腺苷酸活化蛋白激酶(AMP-dependent/activated protein kinase,AMPK)、磷酸化AMPK(phosphorylated AMPK,p-AMPK)蛋白表达。结果与模型组比较,大黄素组小鼠体质量、Lee’s指数及皮下iWAT、eWAT、pWAT指数均显著降低(P<0.05、0.01、0.001),肩胛区体温升高(P<0.01),血糖和血清中TC、TG、LDL-C水平均显著降低(P<0.05、0.01、0.001);BAT中UCP1表达显著增加(P<0.001),皮下iWAT中PGC-1α、PRDM16、TFAM、p-AMPK/AMPK、GLUT4蛋白表达水平均显著升高(P<0.05、0.01)。结论大黄素能够有效抑制肥胖小鼠模型的体质量增加,改善糖脂代谢紊乱,其机制与激活BAT、诱导WAT棕色化有关。

关键词：大黄素脂肪可塑性肥胖糖脂代谢棕色脂肪组织白色脂肪组织

Comments on″Capacity Analysis of the Asymptotically Stable Multi-Valued Exponential Bidirectinal Associative Memory″

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南京邮电大学学报（自然科学版） 2011年第3期31卷 90-93页

作者： CHEN Lei yang geng XU Bi-huan College of Computer Nanjing University of Posts and Telecommunications Nanjing 210046 China Institute of Computer Technology Nanjing University of Posts and Telecommunications Nanjing 210046 China College of Science Nanjing University of Posts and Telecommunications Nanjing 21004-6 China

Asymptotical stability is an important property of the associative memory neural *** this comment,we demonstrate that the asymptotical stability analyses of the MVECAM and MV-eBAM in the asynchronous update mode by Wang et al are not rigorous,and then we modify the errors and further prove that the two models are all asymptotically stable in both synchronous and asynchronous update modes.

关键词： Associative memory asymptotical stability convergence neural network

大型燃煤发电机组锅炉热水再循环宽负荷脱硝改造技术分析及应用

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节能 2024年第8期43卷 37-40页

作者：李玉军张春洁谢天杨庚银中国电建集团海外投资有限公司北京100048 华能国际电力股份有限公司日照电厂山东日照276826 西安热工研究院有限公司陕西西安710054

通过定量分析华能680 MW超临界燃煤电厂机组低负荷运行制约因素,提出锅炉给水再循环联合省煤器给水旁路宽负荷脱硝改造的技术方案。结果显示,该方案改造量少、投资省、工期短,新增设备运行操作量小、维护成本低,以最小的技术产出解决了... 详细信息

通过定量分析华能680 MW超临界燃煤电厂机组低负荷运行制约因素,提出锅炉给水再循环联合省煤器给水旁路宽负荷脱硝改造的技术方案。结果显示,该方案改造量少、投资省、工期短,新增设备运行操作量小、维护成本低,以最小的技术产出解决了脱硝装置的安全和性能问题,在正常运行负载范围内不影响经济性能,具有一定的推广价值。

关键词：超临界机组宽负荷脱硝给水再循环省煤器给水旁路深度调峰

不同菌材培养料对茶树菇生长特性及营养品质的影响

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食品安全质量检测学报 2024年第1期15卷 274-283页

作者：张时馨耿阳阳陈荟王纪辉胡伯凯刘亚娜贵州省核桃研究所贵阳550005 贵州省林业科学研究院贵阳550005 贵州省云关山国有林场贵阳550005

目的研究不同菌材培养料对茶树菇(Agrocybe chaxingu)生长特性和营养品质影响。方法以贵州常见菌材构树(Broussonetia papyrifera)、刺槐(Robinia pseudoacacia)、光皮桦(Betula luminifera)、青冈(Quercus glauca)为栽培料,测定比较木材理化特性对茶树菇农艺性状及粗蛋白、多糖、粗脂肪、矿质元素和氨基酸含量的影响。结果4种菌材对茶树菇菌丝生长速率影响不显著;构树培养茶树菇农艺性状最佳,其次为光皮桦;刺槐培养茶树菇粗脂肪和多糖含量最丰富。青冈培养茶树菇常量元素K、Mg、Ca、Na含量最高,构树培养茶树菇微量元素Fe、Zn、Cu含量最高;光皮桦培养茶树菇总氨基酸、必需氨基酸和限制性氨基酸含量最高。粗蛋白、Cu、Fe、Zn、苯丙氨酸、缬氨酸、Ca、Mg、苏氨酸、多糖、粗脂肪、K依次为区分4种菌材培养茶树菇主要指标。菌丝生长速率与全氮含量呈负相关性,培养基中菌丝生长速率与菌材半纤维素含量呈显著正相关性;子实体重量与木质素含量呈显著正相关性。结论菌材理化性质对茶树菇生长及营养品质具有显著影响。构树和青冈培育茶树菇菌丝生长速率更快,构树和刺槐培育茶树菇子实体农艺性状更佳,光皮桦培育茶树菇营养品质更高。本研究结果可为茶树菇科学栽培及营养品质分析提供参考。

关键词：茶树菇菌材营养品质木质纤维素相关性

Seismic-induced surficial failure of cohesive slopes using three-dimensional limit analysis:A case study of the Wangjiayan landslide in Beichuan, China

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Earthquake Engineering and Engineering Vibration 2024年第3期23卷 537-545页

作者： Gao Yufeng Liu yang geng Weijuan Zhang Fei Key Laboratory of the Ministry of Education for Geomechanics and Embankment Engineering College of Civil and Transportation EngineeringHohai UniversityNanjing 210098China Department of Civil Engineering Faculty of Civil Engineering and MechanicsJiangsu UniversityZhenjiang 212013China

A seismic-induced landslide is a common geological catastrophe that occurs in *** Wangjiayan landslide,which was triggered by the Wenchuan earthquake,is a typical case in *** Wanjiayan landslide caused many casualties and resulted in enormous property *** study constructs a simple surficial failure model based on the upper bound approach of three-dimensional(3D)limit analysis to evaluate the slope stability of the Wangjiayan case,while a traditional two-dimensional(2D)analysis is also conducted as a reference for comparison with the results of the 3D analysis.A quasi-static calculation is used to study the effect of the earthquake in terms of horizontal ground acceleration,while a parametric study is conducted to evaluate the critical cohesion of *** than employing a 3D analysis,using the 2D analysis yields an underestimation regarding the safety *** the Wangjiayan landslide,the difference in the factors of safety between the 3D and 2D analyses can reach 20%.The sliding surface morphology as determined by the 3D method is similar to actual morphology,and the parameters of both are also compared to analyze the reliability of the proposed 3D method.

关键词： landslide Wenchuan earthquake surficial failure limit analysis stability quasi-static

Design and modification of metal sulfide-based catalysts for lithiumsulfur batteries

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Particuology 2024年第3期86卷 86-100页

作者： Yufei Zhao Chuannan geng Li Wang Haotian yang Wei Lv Quan-Hong yang Nanoyang Group State Key Laboratory of Chemical EngineeringSchool of Chemical Engineering and TechnologyNational Industry-Education Integration Platform of Energy Storageand Collaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin UniversityTianjin300072China Shenzhen Geim Graphene Center Engineering Laboratory for Functionalized Carbon MaterialsTsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen518055China Haihe Laboratory of Sustainable Chemical Transformations Tianjin300192China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou350207China

Metal sulfide(MS)have good conductivity,strong adsorption ability,and excellent catalytic activity for the conversion of sulfur species,and thus,show great promise as the catalysts in LieS ***,the relationship between their properties and electrochemical performance is still ***,further in-depth discussions are required to improve their design in Li-S *** review systematically summarizes the basic structural and electrochemical properties of MSs and highlights the advantages that guarantee them as high-performance catalysts in Li-S ***,various modification strategies for MSs to enhance the catalytic activity,efficiency,and stability are also *** last,future opportunities for MS catalysts in Li-S batteries are proposed.

关键词： Lithium-sulfur battery Metal sulfide Catalysis

EBS-Based Collusion Resistant Group Key Management Using Attribute-Based Enc ryption

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China Communications 2012年第1期9卷 92-101页

作者： Chen Yanli yang geng College of Computer Nanjing University of Post ＆Telecommunications Nanjing 210003 P. R. China Overseas Cooperation ＆ Exchange Office Nanjing University of Post ＆Telecommunications Nanjing 210003 P. R. China

The m ajor advantages of EBS-based key rrkanagerrent scheme are its enhanced network survivability, high dynamic performance, and better support for network expansion. But it suffers from the collusion problem, which means it is prone to the cooperative attack of evicted members. A novel EBS-based collusion resistant group management scheme utilizing the construction of Ciphertext-Policy Attribute-Based Encryption （CP-ABE） is proposed. The new scheme satisfies the desired security properties, such as forward secrecy, backward secrecy and collusion secrecy. Compared with existing EBS-based key rmnagement scheme, the new scheme can resolve EBS collusion problem completely. Even all evicted members work together, and share their individual piece of information, they could not access to the new group key. In addition, our scheme is more efficient in terms of conmnication and computation overhead when the group size is large. It can be well controlled even in the case of large-scale application scenarios.

关键词： group key management exclusion basis systems attribute-based encryption collusionres is tant

Formation of G-phase in 20Cr32Ni1Nb Stainless Steel and its Effect on Mechanical Properties

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Acta Metallurgica Sinica(English Letters) 2017年第9期30卷 829-839页

作者： Xiao-Feng Guo Ying-Ying Ni Jian-Ming Gong Lu-yang geng Jian-Qun Tang Yong Jiang Xian-Kai Jia Xin-Yu yang School of Mechanical and Power Engineering Nanjing Tech UniversityNanjing 211816China Key Lab of Design and Manufacture of Extreme Pressure Equipment Nanjing 210037China

A series of tensile tests, Charpy impact tests, optical microscopy observations, and field emission-scanning electron microscopy examinations, were carded out to investigate the mechanical properties and microstructural evolution of 20Cr32NilNb steel. Experimental results indicate that the as-cast microstructure of the steel typically consists of a supersaturated solid solution of austenite matrix with a network of interdendritic primary carbides （NbC and M23C6）. In the ex-service samples, large amounts of secondary carbides precipitate within austenite matrix. Besides the growth and coarsening of NbC and M23C6 carbides during service condition, the Ni-Nb silicides known as G-phase （Nil6Nb6Si7） are formed at the interdendritic boundaries. The microstructural evolution results in the degradation of the mechanical properties of the ex-service steel. In addition, the precipitate rate of G-phase, depending in part on Si content, varies greatly for the 20Cr32NilNb steel, which plays a key role in the long-term microstructural stability of the steel. Based on the X-ray diffraction data, time-temperature-transformation curve for the steel is obtained from the aged specimens.

关键词： 20Cr32NilNb Embrittlement G-phase TTT dial, ram