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A Low-cost and High Efficiency Architecture of AES Crypto-engine

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China Communications 2008年第2期5卷 8-15页

作者： Z.F.Zhao D.Y.Yu L.Li Vinno technologies inc

The growing market of WPAN has led to an increasingdemand of security measures and devices forprotecting the user data transmitted over the *** Encryption Standards(AES)isthe basic security approach for *** meet thelow cost,low power feature and high security demandof WPAN,a low cost,high efficient AES coreis proposed in this *** achieve low cost,methods of integration and resource sharing are usedin designing a very low-complexity architecture,especially in(inverse)byte substitution(inv)SubBytes)modules and(inverse)mix column(inv)MixColumn)modules,*** more,AESEncryptor and Decryptor is integrated into a fullfunctional *** very low-cost andhigh efficiency AES core of IEEE 802.15.4-2006 isdesigned and emulated on Xilinx *** show that this kind of design can be used inresource critical applications,such as smart card,PDA and mobile phones.

关键词： AES S-box Sub-Byte WPAN

Coal pillar mechanics of violent failure in U.S. Mines

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International Journal of Mining Science and Technology 2017年第3期27卷 387-392页

作者： Maleki Hamid Maleki technologies Inc. Spokane WA 99223 USA

This paper seeks to enhance the understanding that the horizontal stresses build up and release during coal pillar loading and unloading(post-failure) drawing upon three decades of observations, geomechanical monitoring and numerical modeling in bump-prone U.S. mines. The focus is on induced horizontal stress in mine pillars and surrounding strata as highly stressed pillars punch into the roof and floor, causing shear failure and buckling of strata; under stiff stratigraphic units of some western US mines, these events could be accompanied by violent failure of pillar cores. Pillar punching eventually results in tensile stresses at the base of the pillar, facilitating transition into the post-failure regime; this transition will be nonviolent if certain conditions are met, notably the presence of interbedded mudstones with low shear strength properties and proper mine designs for controlling seismicity and dynamic loads. The study clearly shows high confining stress build-up in coal pillars resulting in up to twice higher peak vertical stress and high strain energy accumulations in some western US mines in comparison with peak stresses predicted using common empirical pillar design methods. It is the unstable release of this strain energy that can cause significant damage resulting from pillar dilation and ground movements. These forces are much greater than the capacity of most common internal support systems, resulting in horizontal stressinduced roof falls locally, in mines under unremarkable far-field horizontal stress. Attention should be placed on pillar designs as increasing support density may prove to be ineffective. This mechanism is analyzed using field measurements and generic finite-difference stress analyses. The study confirms the higher load carrying capacity of confinement-controlled coal seams in comparison with structurally controlled coal seams. Such significant differences in confining stresses are not taken into account when estimating peak pil

关键词： Rockburst and coal bumps Field measurements Stress analysis Mechanics Horizontal stress

Optimal chunk caching in network coding-based qualitative communication

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Digital Communications and Networks 2022年第1期8卷 44-50页

作者： Lijun Dong Richard Li Futurewei technologies inc. 2330 Central ExpresswaySanta Clara95050USA

Network processing in the current Internet is at the entirety of the data packet,which is problematic when encountering network *** newly proposed Internet service named Qualitative Communication changes the network processing paradigm to an even finer granularity,namely chunk level,which obsoletes many existing networking policies and schemes,especially the caching algorithms and cache replacement policies that have been extensively explored in Web Caching,Content Delivery Networks(CDN)or Information-Centric Networks(ICN).This paper outlines all the new factors that are brought by random linear network coding-based Qualitative Communication and proves the importance and necessity of considering them.A novel metric is proposed by taking these new factors into *** optimization problem is formulated to maximize the metric value of all retained chunks in the local storage of network nodes under the constraint of storage limit.A cache replacement scheme that obtains the optimal result in a recursive manner is proposed *** the help of the introduced intelligent cache replacement algorithm,the performance evaluations show remarkably reduced end-to-end latency compared to the existing schemes in various network scenarios.

关键词： Internet Qualitative communication New IP Chunk caching Random linear network coding End-to-end latency Cache replacement policy Degree of freedom Distance Packet size

Reconfigurable intelligent surface:design the channel-a new opportunity for future wireless networks

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Digital Communications and Networks 2022年第2期8卷 87-104页

作者： Miguel Dajer Zhengxiang Ma Leonard Piazzi Narayan Prasad Xiao-Feng Qi Baoling Sheen Jin Yang Guosen Yue Wireless Access Lab Futurewei TechnologiesInc.BridgewaterNJ08807USA

In this paper,we survey state-of-the-art research outcomes in the burgeoning field of Reconfigurable Intelligent Surface(RIS),given its potential for significant performance enhancement of next-generation wireless communication networks by means of adapting a propagation *** has been placed on several aspects gating the commercial viability of future network *** summaries are provided for practical hardware design considerations and broad implications of artificial intelligence techniques,as are in-depth outlooks on the salient aspects of system models,use cases,and physical layer optimization techniques.

关键词： Reconfigurable intelligent surface MIMO Channel estimation Beamforming Reflectarray Transmitarray Machine learning Deep learning

China's Software Industry Aiming at a Higher Standard

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Wuhan University Journal of Natural Sciences 2001年第Z1期6卷 355-358页

作者： Ju De hua Application Solutions & technologies,inc Shanghai, Shanghai 200233, China Application Solutions & technologies Inc Shanghai Shanghai China

The current status of the China's software industry is introduced, including the great potential opportunities and many problems across the path to success. The main measures are discussed to keep abreast of the tim... 详细信息

关键词： China's software industry offshore service software process improvement

E-Forms in E-Business

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Wuhan University Journal of Natural Sciences 2001年第Z1期6卷 121-125页

作者： Ju De hua 1,Sheng Hao lin 2,Shen Bei jun 3 1.Application Solution & technologies,inc Shanghai,Shanghai 200233, China 2.Application Solution & technologies,inc USA,MD 20852, USA 3.East China University of Science & Technology,Shanghai 2002 Application Solution & technologies Inc Shanghai Shanghai China Application Solution & technologies Inc USA USA East China University of Science & Technology Shanghai China

The form based application framework is proposed as a straight solution for E business applications. A Rapid Application Development (RAD) tool FormNet is designed for developing complex enterprise network applications. Its main features and a comparison with Microsoft Windows Forms are presented in this paper. The tool can be also perfectly applied to the government form applications.

关键词： E business E forms Internet/Intranet/Extranet applications RAD tools

Key Techniques in Real Time Digital Simulation for Closed-loop Testing of HVDC Systems

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CSEE Journal of Power and Energy Systems 2017年第2期3卷 125-130页

作者： Yi Zhang Hui Ding Rick Kuffel RTDS technologies inc. WinnipegManitobaCanada

This paper introduces several key techniques in realtime digital simulation for closed-loop testing of high voltage direct current(HVDC)systems,including line commutated converter(LCC)HVDC valve group models,modular multilevel converter(MMC)HVDC models,phase domain frequency dependent transmission line models,and switchable filter *** issues such as background,algorithms,implementations,applications,and validation of these models are *** techniques represent the most advanced technology in modelling HVDC systems on a real time *** models have been implemented on the RTDS Simulator,a comprehensive real time power system digital simulation tool.

关键词： HVDC real time simulation

Low-Density Parity-Check Codes for Noncoherent UWB Communication Systems

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China Communications 2017年第7期14卷 152-162页

作者： Zhonghua Liang Junshan Zang Xiaojun Yang Xiaodai Dong Huansheng Song School of Information Engineering Chang'an University Jushri technologies inc Department of Electrical and Computer Engineering University of Victoria

In order to guarantee reliable data transmission, powerful channel coding techniques are usually required in noncoherent ultra-wideband(UWB) communication systems. Accordingly, several forward error correction(FEC) codes, such as Reed-Solomon and convolutional codes have been used in noncoherent UWB systems to improve the bit error rate(BER) performance. In this paper, low-density parity-check(LDPC) codes are further studied as more powerful FEC candidates for noncoherent UWB systems. Two LDPC codes and the corresponding decoding procedures are presented for noncoherent UWB systems. Moreover, performance comparison between the LDPC codes and other FEC codes are provided for three major noncoherent UWB communication systems, namely, noncoherent pulse position modulation(NC-PPM), transmitted reference(TR) and transmitted reference pulse cluster(TRPC). Both theoretical analysis and simulation results show that the two investigated LDPC codes outperform other existing FEC codes with limited penalty in terms of complexity and therefore they are promising FEC candidates for noncoherent UWB systems with low-cost and low-power consumption.

关键词： UWB noncoherent channel coding LDPC codes

Towards the development of integrated monitoring system for retreat mining operations

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Journal of Coal Science & Engineering(China) 2008年第3期14卷 477-484页

作者： HAMID Maleki Maleki technologies Inc.Spokane WA 99201USA

Through cooperative research between the government,the private sector, mining companies and equipment manufacturers,considerable progress had been made during the last decade in studying the mechanics of strata failure and acquiring the know- ledge needed to develop an integrated monitoring system for assessing local roof stability. Because of higher geotechnical risks in retreat mining operations,it was both important to develop panel layout designs that control convergence and stress and to monitor ground response during operations to verify designs and provide warning of impending stability *** detecting both localized roof stability problems and global overburden col- lapse mechanisms,the proposes an integrated panel-wide monitoring system which com- bines the capabilities of load rate monitoring of mobile roof supports (MRSs) with deforma- tion measurements using an extensive array of sensors located near the mining face and throughout the *** monitoring methods for the detection of localized roof stability problems have been evaluated on the basis of mine measurements and numerical model- ing *** are load rate monitoring of the hydraulic cylinders of mobile roof support (MRS) and re mote monitoring of roof *** of field data in retreat sections show that roof instabilities are influenced by: (1) pillar failure,(2) pillar yielding,(3) mine seismicity (bumps),(4) geologic structures,and (5) panel layout designs and practice. Pillar yielding and unloading can be conveniently monitored by the load rate monitoring device,but to detect impending localized roof falls,additional ground deformation meas- urements are needed near the mining *** increasing the number of deformation measurements in the entire panel,additional safeguards can be achieved for detecting overburden collapse mechanisms while continuously monitoring local roof stability close to the retreat line.

关键词： monitoring system convergence mobile roof supports