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International Conference on Sustainable Power Generation and Supply, SUPERGEN

作者： Jun Li Changqing Dong Junjiao Zhang Yongping Yang National Engineering Laboratory of Biomass Power Generation Equipment Key Laboratory of Condition Monitoring and Control for Power PlantEquipment Ministry of Education Beijing Key Laboratory of Security & Clean Energy Technology North China Electric Power University Beijing China

Chemical-looping combustion (CLC) is a new method for the combustion of fuel gas with inherent separation of carbon dioxide. The cold interconnected fluidized beds (Oslash100) were set-up for the hot model design in this work. The pressure drop of both air reactor (AR) and fuel reactor (FR) were measured and used for CLC system design. The effects of superficial gas velocity on pressure distribution of both AR and FR were presented. Before fluidization, the pressure drop characteristics of two reactors in interconnected dual fluidized bed for CLC sharply increase with the increasing of gas velocity, which just similar to that of conventional circulating fluidized bed. And after fluidization, the pressure drop of two reactors in dual fluidized bed decreased with the increasing gas velocity. It could be seen that u FR must be increased with an enhancive u AR value to ensure exchange of bed material, and the higher of the gas velocity, the more material could be exchanged.

关键词： Fluidization Inductors Combustion Power generation Cyclones Fossil fuels Immune system Solids Carbon dioxide Pressure measurement

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A security-Enhanced Remote Platform Integrity Attestation Scheme

A Security-Enhanced Remote Platform Integrity Attestation Sc...

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International Conference on Wireless Communications, Networking and Mobile Computing (WiCom)

作者： Song Cheng Liu Bing Xin Yang Yang Yixian Zhongxian Li Yin Han Key Laboratory of network and information attack & defence technology of MOE Beijing University of Posts and Telecommunications Beijing China National Engineering Laboratory for Disaster Backup and Recovery Beijing China National Cybernet Security Ltd Beijing China Huawei Technology Ltd Beijing China

Remote platform integrity attestation is a method by which a client attests its hardware and software configuration to a remote server. The goal of remote integrity platform attestation is to enable a remote challenger to determine the level of trust in the integrity of another attestator's platform configuration. However, the existing integrity reporting protocol is vulnerable to man-in-the-middle(MITM) attacks. In this paper, we describe this kind of attacks against protocols for remote platform integrity attestation, and propose a security-enhanced remote platform integrity attestation scheme for preventing man-in-the middle attacks.

关键词： Protocols Information security Laboratories Cryptography Hardware Protection Privacy Telecommunication switching Computer security National security

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Dynamics of chaotic systems with attractive and repulsive couplings

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Physical Review E 2009年第4期80卷 046206-046206页

作者： Yuehua Chen Jinghua Xiao Weiqing Liu Lixiang Li Yixian Yang School of Science Beijing University of Posts and Telecommunications Beijing 100876 China School of Science Jiangxi University of Science and Technology Ganzhou 341000 China Information Security Center State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications P.O. Box 145 Beijing 100876 China Key Laboratory of Networking and Information Attack and Defence Technology of Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China National Engineering Laboratory for Disaster Backup and Recovery Beijing University of Posts and Telecommunications Beijing 100876 China

Together with attractive couplings, repulsive couplings play crucial roles in determining important evolutions in natural systems, such as in learning and oscillatory processes of neural networks. The complex interactions between them have great influence on the systems. A detailed understanding of the dynamical properties under this type of couplings is of practical significance. In this paper, we propose a model to investigate the dynamics of attractive and repulsive couplings, which give rise to rich phenomena, especially for amplitude death (AD). The relationship among various dynamics and possible transitions to AD are illustrated. When the system is in the maximally stable AD, we observe the transient behavior of in-phase (high frequency) and out-of-phase (low frequency) motions. The mechanism behind the phenomenon is given.

关键词： Dynamics

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Dependence Analysis for C Programs with Combinability of Dataflow Facts under Consideration

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Wuhan University Journal of Natural Sciences 2009年第4期14卷 321-326页

作者： QIAN Ju XU Baowen ZHOU Xiaoyu CHEN Lin SHI Liang College of Information Science and Technology NanjingUniversity of Aeronautics and Astronautics Nanjing 210016Jiangsu China State Key Laboratory for Novel Software Technology Nanjing University Nanjing 210093 Jiangsu China Department of Computer Science and Technology NanjingUniversity Nanjing 210093 Jiangsu China School of Computer Science and Engineering SoutheastUniversity Nanjing 211189 Jiangsu China Microsoft China Research and Development Group Beijing100080 China

To avoid the precision loss caused by combining data- flow facts impossible to occur in the same execution path in dependence analysis for C programs, this paper first proposes a flow-sensitive and context-insensitive points-to analysis algorithm and then presents a new dependence analysis approach based on it. The approach makes more sufficient consideration on the executa- ble path problem and can avoid invalid combination between points-to relations and between points-to relations and reaching definitions. The results of which are therefore more precise than those of the ordinary dependence analysis approaches.

关键词： pointer analysis dependence analysis executable path

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Cyclic redundancy code check algorithm based on small lookup table

Cyclic redundancy code check algorithm based on small lookup...

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IEEE International Conference on Communications technology and Applications, ICCTA

作者： Jianfen Peng Yajian Zhou Yixian Yang National Engineering Laboratory for Disaster Bacup and Recovery Information Security Group State Key Laboratory of Networking and Switiching Techonolgy Key Laboratory of Information Attack & defence Technology of MOE Beijing University of Posts and Telecommunications China

ISBN: (纸本)9781424448166

Real time and low occupation of memory must be satisfied in the error controlling of computer networks. Cyclic redundancy code generation algorithm based on small lookup table (CRCGA) is presented in this paper, which is based on ¿slicing-by-4¿ algorithm proposed by M. E. Kounavis et. al. and uses the distributive property of mod function in modulo-2 arithmetic to reduce the size of cache demanded by the algorithm by half. CRCGA reads 32 bits at a time, only needs 2-KByte cache footprint. Simulation results show that CRCGA can be applied to small control equipment in distributed control system.

关键词： Cyclic redundancy check codes Table lookup Decision support systems

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The optimized geometric structure of the (0001) surface of α-Fe2O3

The optimized geometric structure of the (0001) surface of ...

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International Conference on Sustainable Power Generation and Supply, SUPERGEN

作者： Xiaolei Zhang Junjiao Zhang Changqing Dong Dalong Jiang Yongping Yang National Engineering Laboratory of Biomass Power Generation Equipment Key Laboratory of Condition Monitoring and Control for Power Plant Equipment Ministry of Education Beijing Key Laboratory of Security & Clean Energy Technology North China Electric Power University Beijing China

A tridimensional model of alpha-Fe 2 O 3 and models of (0001) and (1102) surfaces on it were built. Then the structural optimization of the (0001) surface was presented which explored the influence of the system scale and the terminal surface configuration. Four different models including two different system scale structures (MODEL square and MODEL square) and two different terminal structures (MODEL square and MODEL square) were analyzed in this paper. It was concluded that the boundary effect was more important in a smaller system in the structure optimization. And the Fe-terminated was more stable than the O-terminated structure which was agreed with the experiences, this structural model can be used in further work including the monatomic adsorption/desorption and the chemical reactions on this surface.

关键词： Surface cleaning Chemicals Magnetic separation Magnetic materials Iron Surface structures Inductors Solid modeling Combustion Fuels

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The interaction between HCl and Fe2O3 during the chemical looping combustion of MSW

The interaction between HCl and Fe2O3 during the chemical lo...

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International Conference on Sustainable Power Generation and Supply, SUPERGEN

作者： Junjiao Zhang Changqing Dong Liang Wang Yongping Yang National Engineering Laboratory of Biomass Power Generation Equipment Key Laboratory of Condition Monitoring and Control for Power Plant Equipment Ministry of Education Beijing Key Laboratory of Security & Clean Energy Technology North China Electric Power University Beijing China

In order to avoid dioxin emission from municipal solid waste combustion (MSW), chemical looping combustion was considered. The interaction between HCl and Fe 2 O 3 was studied in this paper and experiments were carried out in a fixed bed reactor. Chlorine was measured by methyl orange spectrophotometric method. The intermediate reactions were calculated with standard Gibbs free energy and reaction equilibrium constants. The result showed that: when Fe 2 O 3 is used as oxygen carrier, the conversion of HCl to chlorine can be suppressed, thus reduce Dioxin emission.

关键词： Iron Incineration Solids Combustion Chemicals Pollution Hydrogen Power generation Humans Automatic control

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A REAL-TIME INFORMATION HIDING ALGORITHM BASED ON HTTP PROTOCOL

A REAL-TIME INFORMATION HIDING ALGORITHM BASED ON HTTP PROTO...

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2009 IEEE International Conference on Network Infrastructure and Digital Content(2009年IEEE网络基础设施与数字内容国际会议 IEEE IC-NIDC2009)

作者： Jingzhong Wang Tianling Xu Kaiguo Yuan Xinxin Niu Yixian Yang School of Information Engineering North China University of Technology Beijing 100041 P. R. China Information Security Center State Key Laboratory of Networking and Switching Technology Beijing Un

ISBN: (纸本)9781424448999

Based on the structure of HTTP protocol, a real-time information hiding algorithm was proposed in this paper, to solve the problem that embedding a mass of data in the TCP/IP packet. The secret information is embedded in HTTP protocol header fields. It's proved that the capacity of the algorithm is perfect by experiments, and more than 1000 bytes of data could be embedded in a HTTP request-packet (Get-packet), while the transparency is very well. At the same time, the information hidden will not affect on packets transmitting.

关键词： HTTP protocol information hiding hiding capacity structure hiding

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security Analysis of Two Remote User Authentication Schemes Using Bilinear Pairings

Security Analysis of Two Remote User Authentication Schemes ...

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International Conference on Management of e-Commerce and e-Government, ICMECG

作者： Zuowen Tan Key Laboratory of Network Security and Cryptology School of Mathematics and Computer Science Fujian Normal University Fuzhou China School of Information Technology Jiangxi University of Finance and Economics Nanchang Jiangxi China State Key Laboratory of Information Security Institute of Software of Chinese Academy of Sciences Beijing China

Recently, Das et al. and Tseng et al. proposed a remote user authentication scheme using bilinear pairings, respectively. They can provide a flexible password change option to the users without any help from the remote server. However, some weaknesses of the two bilinear pairing based remote password authentication schemes are found in the paper. The schemes suffer from offline password guessing attack and impersonation attacks.

关键词： Authentication Identity-based encryption Network servers Information security Elliptic curve cryptography Public key Elliptic curves Computer security Galois fields Computer network management

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An improved algorithm for IP alias resolution in network topology measurement

An improved algorithm for IP alias resolution in network top...

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9th International Conference on Electronic Measurement and Instruments, ICEMI 2009

作者： Yong, Zhang Shize, Guo Kangfeng, Zheng Yixian, Yang Key Laboratory of Network and Information Attack and Defence Technology of MOE Beijing University of Posts and Telecommunications Beijing 100876 China National Engineering Laboratory for Disaster Backup and Recovery Beijing University of Posts and Telecommunications Beijing 100876 China Information Security Center State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China

ISBN: (纸本)9781424438624

Internet topology measurement is an important part of Network measurement. Nowadays, traceroute probing method is widely used to obtain the original route data, and the IP alias resolution technique is to identify IP addresses belonging to the same router for constructing accurate Internet maps. However, there are thousands of IP addresses only in a region topology exploration, while current alias resolution technique has limited effectiveness. So we need to apply a new approach to refine the collected path traces before IP alias resolution which is called Alias Filter (AF). In this paper we propose an improved algorithm called RAF which based on rules set according to experiences for dealing with the path data. The performance analysis proves the algorithm has low cost and high efficiency. ©2009 IEEE.

关键词： Network topology

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