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Improved performance of GaN-based light-emitting diodes by using short-period superlattice structures

Progress in Natural science:Materials International 2010年第1期20卷 70-75页

作者： Yi-jung LIU~1,Chien-chang HUANG~1,Tai-you CHEN~1,Chi-shiang HSU~1,Shiou-ying CHENG~2, Kun-wei LIN~3,Jian-kai LIOU~1,Wen-chau LIU~1 1.institute of Microelectronics,department of Electrical Engineering,National Cheng-Kung University, Tainan 70101,Taiwan,china 2.department of Electronic Engineering,Nation Ilan University,I-Lan 26041,Taiwan,china 3.department and Graduate institute of Computer science and information Engineering, Chaoyang University of technology,Taichung 41349,Taiwan,china institute of Microelectronics Department of Electrical Engineering National Cheng-Kung University Tainan 70101 Taiwan China department of Electronic Engineering Nation Ilan University I-Lan 26041 Taiwan China department and Graduate institute of Computer science and information Engineering Chaoyang University of Technology Taichung 41349 Taiwan China

An InGaN/GaN multiple-quantum-well（MQW）light-emitting diode（LED）with a ten-period i（undoped）-InGaN/p（Mg doped）-GaN（2.5 nm/5.0 nm）superlattice（SL）structure,was *** SL structure that can be regarded as a confinement layer of holes to enhance the hole injection efficiency is inserted between MQW and p-GaN *** studied LED device exhibits better current spreading performance and an improved quality,compared with a conventional one without SL *** to the reduced contact resistance as well as more uniformity of carriers injection,the operation voltage at 20 mA is decreased from 3.32 to 3.14 V.A remarkably reduced reverse-biased leakage current(10-7-10-9A)and higher endurance of the reverse current pulse are *** measured output power and external quantum efficiency（EQE）of the studied LED are 13.6 mW and 24.8%,respectively. In addition,significant enhancement of 25.4%in output power as well as increment of 5%in EQE for the studied devices is observed, as the studied devices show superior current spreading ability and reduction in dislocations offered by the SL structure.

关键词： GaN superlattice(SL) current spreading hole confinement electrostatic discharge(ESD)

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A novel logic-based automatic approach to constructing compliant security policies

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science china(information sciences) 2012年第1期55卷 149-164页

作者： BAO YiBao1,2,4,YIN LiHua1,FANG BinXing 1,3&GUO Li 1 1institute of computing technology,Chinese Academy of sciences,Beijing 100190,china 2institute of Electronic technology,information Engineering University,Zhengzhou 450004,china 3Beijing University of Posts and Telecommunications,Beijing 100190,china 4Graduate University,the Chinese Academy of science,Beijing 100049,china institute of computing technology Chinese Academy of Sciences Beijing China institute of Electronic technology Information Engineering University Zhengzhou China Graduate University the Chinese Academy of Science Beijing China Beijing University of Posts and Telecommunications Beijing China

It is significant to automatically detect and resolve the incompliance in security *** existing works in this field focus on compliance verification,and few of them provide approaches to automatically correct the incompliant security *** paper proposes a novel approach to automatically transform a given security policy into a compliant *** security policy Π and delegation policy M declared by logic programs,the approach automatically rewrites Π into a new one ΠM which is compliant with M and is readable by the *** prove that the algorithm is sound and complete under noninterference ***,we show that the security policy query evaluation algorithm with conflict and unsettlement resolution still works very well on Π*** approach is automatic,so it doesn't require a administrator with excess *** this sense,our proposal can help us to save much manpower resource in security management and improves the security assurance abilities.

关键词： security policy rewriting logic program compliance

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Identifying heavy hitters in high-speed network monitoring

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science china(information sciences) 2010年第3期53卷 659-676页

作者： ZHANG Yu1, FANG BinXing1,2 & ZHANG YongZheng2 1Research Center of Computer Network and information Security technology, Harbin institute of technology, Harbin 150001, china 2Research Center of information Security, institute of computing technology, Chinese Academy of sciences, Beijing 100190, china Research Center of Computer Network and information Security technology Harbin Institute of Technology Harbin China Research Center of information Security Institute of Computing Technology Chinese Academy of Sciences Beijing China

Identifying heavy hitters in a network traffic stream is important for a variety of network applications ranging from traffic engineering to anomaly detection such as detection of denial-of-service attacks. Existing methods generally examine newly arriving items in the stream, perform a small number of operations using a small amount of memory, and still provide guarantees on the identifying accuracy. In high-speed network monitoring, the update speed per item is extremely critical. However, so far as we know, there are no identifying algorithms which can provide constant update time (O(1)) in a weighted data stream. In this paper, we present an algorithm named Weighted Lossy Counting (WLC) which is able to identify heavy hitters in a high-speed weighted data stream with constant update time. WLC employs a novel efficient partially ordered data structure which is able to provide a fast per-item update speed while keeping the memory cost relatively low. We compare WLC with state-of-the-art algorithms for finding heavy hitters in real traffic traces. The experimental results show that WLC performs well in accuracy (recall, precision and average relative error) as other algorithms; moreover it has a much higher update speed at the cost of relatively larger memory space used. A theoretical worst-case memory bound of WLC is also derived in this paper; however, experiments with long real traffic traces show that WLC requires much less space than the theoretical bound in practice.

关键词： network traffic monitoring heavy hitter weighted data streams

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CONGRATULATIONS TO ACADEMICIAN JUNZHI CUI ON HIS 70^(th) BIRTHDAY

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Journal of Computational Mathematics 2008年第3期26卷 259-260页

作者： institute of Computational Mathematics and Scientific/Engineering computing Academy of Mathematics and Systems science Chinese Academy of sciences institute of Computational Mathematics and Scientific/Engineering computing Academy of Mathematics and Systems science Chinese Academy of sciences

Professor Junzhi Cui was born on June 15, 1938 in Xinxiang, Henan Province in china. He graduated from the department of Mathematics and Mechanics, Northwestern Polytechnic University in 1962. Since then, he has been ... 详细信息

关键词： BIRTHDAY CONGRATULATIONS TO ACADEMICIAN JUNZHI CUI ON HIS 70 th HIS

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EXPONENTIAL STABILITY OF A REPARABLE MULTI-STATE DEVICE

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Journal of Systems science & Complexity 2007年第3期20卷 437-443页

作者： Weiwei HU Houbao XU Jingyuan YU Guangtian ZHU Beijing institute of information and Control Beijing 100037 China. department of Mathematics Beijing Institute of Technology Beijing 100081 China. Academy of Mathematics and Systems science Chinese Academy of Sciences Beijing 100080 China.

The exponential stability of a multi-state device is discussed in this paper. We present that the Co-semigroup generated by the system operator is quasi-compact and irreducible. It is known that 0 is a simple eigenvalue of the system operator. In combination with this, we obtain that the time-dependent solution exponentially converges to the steady-state solution, which is the positive eigenfuction corresponding to the simple eigenvalue O.

关键词： C0-semigroup exponential stability irreducibility quasi-compact.

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Efficient Authenticated Key Agreement Protocol Using Self-Certified Public Keys from Pairings

Efficient Authenticated Key Agreement Protocol Using Self-Ce...

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The 1st Chinese Conference on Trusted computing and information Security

作者： SHAOZu-hua department of Computer and Electronic Engineering, zhejiang University of science and technology, hangzhou 310012, zhejiang, china

＜正＞ An efficient authenticated key agreement protocolis proposed, which makes use of bilinear pairings and selfcertifiedpublic keys. Its security is based on the security assumptionsof the bilinear Diffie-Hellman problem and the computational Diffie-Hellman problem. Users can choose their private keys independently. The public keys and identitiesof users can be verified implicitly when the session key being generating in a logically single step. A trusted Key Generation Center is no longer required as in the ID-based authenticated key agreement protocols. Compared with existing authenticated key agreement protocols from pairings, the new proposed protocol is more efficient and secure.

关键词： authenticated key agreement protocol selfcertifiedpublic keys bilinear pairings

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Material properties dependent on the thermal transport in a cylindrical nanowire

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Chinese Physics B 2015年第12期24卷 440-444页

作者：张勇谢忠祥邓元祥喻霞李科敏 department of Mathematics and Physics Hunan Institute of Technology department of Physics and Electronics information Hunan Institute of Science and Technology

Using the elastic wave continuum model, we investigate the effect of material properties on ballistic thermal transport in a cylindrical nanowire. A comparative analysis for the convexity-shaped and concavity-shaped structure is made. It is found that in the convexity-shaped structure, the material with higher wave velocity in the convexity region can increase the thermal conductance at the lower temperature range; the thermal conductance of the nanowire with higher wave velocity in the convexity region is lower than that of the nanowire with lower wave velocity in the convexity region at the higher temperature range. However, in the concavity-shaped structure, the material properties of the concavity region have less effect on the thermal conductance at the lower temperature range; the material with higher wave velocity in the concavity region can reduce the thermal conductance at the higher temperature range. A brief analysis of these results is given.

关键词： acoustic phonon transport nanostructure transmission coefficient thermal conductance

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Delay-dependent robust H∞ control for uncertain fuzzy hyperbolic systems with multiple delays

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Progress in Natural science:Materials International 2008年第1期18卷 97-104页

作者： Huaguang Zhanga ,*,Qingxian Gong a,b ,Yingchun Wang a aSchool of information science and Engineering,Northeastern University,Shenyang 110004,china bdepartment of Electrical Engineering,Changchun institute of technology,Changchun 130012,china School of information science and Engineering Northeastern University Shenyang 110004 China department of Electrical Engineering Changchun Institute of Technology Changchun 130012 China

The robust H∞ control problem was considered for a class of fuzzy hyperbolic model(FHM)systems with parametric uncertainties and multiple ***,FHM modeling method was presented for time-delay nonlinear ***,by using Lyapunov–Krasov- skii approaches,delay-dependent suficient condition for the existence of a kind of state feedback controller was proposed,which was expressed as linear matrix inequalities(LMIs).The controller can guarantee that the resulting closed-loop system is robustly asymptot- ically stable with a prescribed H∞ performance level for all admissible uncertainties and ***,a simulation example was provided to illustrate the effectiveness of the proposed approach.

关键词： Fuzzy hyperbolic model Robust H1 control Asymptotical stability Linear matrix inequality Uncertain time-delay system

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Multiple constraints QoS multicast routing optimization algorithm in MANET based on GA

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Progress in Natural science:Materials International 2008年第3期18卷 331-336页

作者： Baolin Sun a,c, Shangchao Pi b, Chao Gui a, Yue Zeng d, Bing Yan a, Wenxiang Wang c, Qianqing Qin c a School of computing, Hubei University of Economics, Wuhan 430205, china b College of science, Zhongyuan University of technology, Zhengzhou 450007, china c State Key Laboratory of information Engineering in Surveying, Mapping & Remote Sensing, Wuhan University, Wuhan 430079, china d department of computing, Jiangxi Vocational College of Finance and Economics, Jiangxi 332000, china School of computing Hubei University of Economics Wuhan 430205 China State Key Laboratory of information Engineering in Surveying Mapping & Remote Sensing Wuhan University Wuhan 430079 China College of science Zhongyuan University of Technology Zhengzhou 450007 China department of computing Jiangxi Vocational College of Finance and Economics Jiangxi 332000 China

Usually multiple quality of service (QoS) guarantees are required in most multicast applications. This paper presents a multiple con-straints algorithm for multicast traffic engineering in mobile ad hoc networks (MANET). The proposed algorithm is a new version of multiple constraints QoS multicast routing optimization algorithm in MANET based on genetic algorithm (MQMGA). The proposed MQMGA can optimize the maximum link utilization, the cost of the multicast tree, the selection of the long-life path, the average delay and the maximum end-to-end delay. Experimental result shows that the approach is efficient, has promising performance in multicast traffic engineering and for evaluating the route stability in dynamic mobile networks.

关键词： Ad hoc network Multicast routing QoS Genetic algorithm

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science china Chemistry 2004年第6期47卷 466-479页

作者： SONG Huajie1,2, XIAO Heming1 & DONG Haishan2 1. department of Chemistry, Nanjing University of science and technology, Nanjing 210094, china 2. institute of Chemical Materials, china Academy of Engineering Physics, Mianyang 621900, china department of Chemistry Nanjing University of Science and Technology Nanjing China institute of Chemical Materials China Academy of Engineering Physics Mianyang China

The symmetry-adapted perturbation theory (SAPT) that has the ability in decompo- sition of the total interaction energy into physically meaningful components is used to provide a more fundamental understanding of intermolecular forces. This work was motivated by the diffi- culty of standard SAPT in computing the intermolecular interactions for large energetic dimer systems. SAPT based on Kohn-Sham orbitals (SAPT(DFT)) proves computationally efficient for these large systems, but has been shown to perform poorly for interaction energy components. The deficiencies of SAPT(DFT) result from wrong asymptotical behaviors of commonly used exchange-correlation potentials. To remove the deficiencies, two asymptotic corrections by means of van Leeuwen and Baerends (LB) model potential and Fermi-Amaldi (FA) type potential were applied into three small test systems comprising He2, HF2 and (N2)2 and a set of larger ni- tramide dimers at several separations. The results showed that when utilizing newly developed frequency-dependent density susceptibilities (FDDS) technique for computing dispersion energy, the FA asymptotic correction is very effective to circumvent these deficiencies in SAPT(DFT) and yields a good accuracy over the LB correction. The FA corrected SAPT(DFT) approach is capa- ble of correctly predicting all the quantitative trends in binding energies for all test cases and substantially reduces computational cost as compared with the standard SAPT calculations. The successful application of the approach to nitramide dimer demonstrates that it potentially pro- vides a good means to calculate accurately intermolecular forces in larger system such as en- ergetic systems.

关键词： intermolecular interaction, density functional theory (DFT), symmetry adapted perturbation theory (SAPT), asymptotic correction, frequency-dependent density susceptibilities (FDDS).

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