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Simple technique to fabricate microscale and nanoscale silicon waveguide devices

Frontiers of Optoelectronics 2009年第3期2卷 308-311页

作者： Yao CHEN Junbo FENG Zhiping ZHOU Christopher J.SUMMERS David S.CITRIN Jun YU Department of Electronic Science and Technology Huazhong University of Science and Technology Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology State Key Laboratory on Advanced Optical Communication Systems and Networks Peking University School of Electrical and Computer Engineering Georgia Institute of Technology School of Materials Science and Engineering Georgia Institute of Technology Unité Mixte Internationale 2958 Georgia Tech-CNRS Georgia Tech Lorraine

Fabrication of microscale and nanoscale silicon waveguide devices requires patterning silicon, but until recently, exploitation of the technology has been restricted by the difficulty of forming ever-small features with minimum linewidth fluctuation. A technique was developed for fabricating such devices achieving vertical sidewall profile, smooth sidewall roughness of less than10 nm, and fine features of 40 nm. Subsequently, silicon microring resonator and silicon-grating coupler were realized using this technique.

关键词： nanofabrication silicon waveguide roughness microring resonator grating coupler

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Democratic Group Signatures with Threshold Traceability

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Journal of Shanghai Jiaotong university(science) 2009年第1期14卷 98-101页

作者：李祥学钱海峰李建华 School of Information Security Engineering Shanghai Jiaotong UniversityShanghai 200240China State Key Lab of Information Security Graduate School of Chinese Academy of SciencesBeijing 100039China State Key Laboratory of Integrated Service Networks Xidian UniversityXi'an 710071China Computer Science and Technology Department East China Normal UniversityShanghai 200241China

This paper presents a concrete democratic group signature scheme which holds （t, n）-threshold traceability. In the scheme, the capability of tracing the actual signer is distributed among n group members. It gives a valid democratic group signature such that any subset with more than t members can jointly reconstruct a secret and reveal the identity of the signer. Any active adversary cannot do this even if he can corrupt up to t - 1 group members.

关键词： democratic group signature （DGS） anonymity traceability threshold traceability

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A policy language for expressing access control properties in PDAC model

A policy language for expressing access control properties i...

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International Conference on computer science & Education (ICCSE)

作者： Xian Wu Peide Qian School of Computer Science and Technology Jiangsu Provincial Key Laboratory for Computer Information Processing Technology Soochow University Suzhou China School of Computer Science and Technology Soochow University Suzhou China

An access control policy defines what is authorized, and an access control mechanism implements the policy to ensure that all accesses are in accordance with the underlying policy. Nowadays, many researcher are working for expressing access policies in a formal way. But it is still an open problem. This paper defines a policy language, which is named as PDPL to express access policies and access control properties in PDAC model [1]. This language unifies ldquoBANrdquo logic with past- and future- time temporal logic. We give the syntax and semantics of PDPL, and provided some examples with their English equivalents. This logic language can express belief and authorization in access control model. And it can deal with delegations of decision-making directly. It is easy for us to formulate the properties of interest in distributed systems of PDAC model through PDPL. This logical language is part of a formal system, and it will be used in an automatic model checker in the future.

关键词： Access control Logic Natural languages computer science Educational technology Engines Contracts Body sensor networks Authorization computer science education

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Web mining of OOV translations

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Journal of Information and Computational science 2009年第1期6卷 97-103页

作者： Sun, Jun Yao, Jianmin Zhang, Jing Zhu, Qiaoming Provincial Key Laboratory of Computer Information Processing Technology Soochow University Suzhou 215006 China School of Computer Science and Engineering South China University of Technology Guangzhou 510641 China

OOV translations, including new words, collocations, as well as phrases, are the key flesh of a human language while an obstacle to machine translation. Some researchers manually compose the dictionary for OOV translations;some search for the words from parallel or comparable corpora. We take web mining approach to this problem. The basic assumption lies in that most of the OOV's translations exist on the web, and search engines can provide many web pages containing the OOV and corresponding translations. We mine the translation from returned snippets of the search engine. We take translating Chinese phrases into English as an example. Experiment shows our solution can discover the translation to many of the OOVs with quite high precision. The method is essentially language independent. © 2009 Binary Information Press.

关键词： Search engines

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Enhanced light-extraction in GaN light-emitting diode with binary blazed grating reflector

Enhanced light-extraction in GaN light-emitting diode with b...

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Photonics and Optoelectronics Meetings (POEM) 2008: Optoelectronic Devices and Integration

作者： Wenhua, Wu Huaming, Wu Tingwei, Wu Yi, Wang Zhiping, Zhoub Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan Hubei 430074 China State Key Laboratory on Advanced Optical Communication Systems and Networks Peking University Beijing 100871 China School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332 United States

ISBN: (纸本)9780819475381

Enhancement of light extraction in a GaN light-emitting diode (LED) employing a binary blazed grating reflector (BBGR) is presented. The BBGR consists of asymmetrically periodic structure etched on the GaN layer. Rigorous coupled-wave analysis (RCWA) is adopted to calculate the reflectivity of the BBGR, which shows that it has the characteristics of broadband reflection spectrum and very high reflectivity. The result of high angle-averaged reflectivity up to 94% from 300nm to 450nm predicts the potential enhancement of light-extraction efficiency of GaN LEDs with BBGR. © 2009 SPIE.

关键词： Reflection

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Fabrication of annular photonic crystals by atomic layer deposition and sacrificial etching

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Journal of Vacuum science and technology B: Microelectronics and Nanometer Structures 2009年第2期27卷 568-572页

作者： Feng, Junbo Chen, Yao Blair, John Kurt, Hamza Hao, Ran Citrin, D.S. Summers, Christopher J. Zhou, Zhiping School of Optoelectronics Science and Engineering Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 China Department of Electronic Science and Technology Huazhong University of Science and Technology Wuhan Hubei 430074 China School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30332-0245 United States Department of Electrical and Electronics Engineering TOBB University of Economics and Technology Ankara 06560 Turkey School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332-0250 United States Unit Mixte Internationale 2958 Georgia Tech-CNRS Georgia Tech Lorraine 2 rue Marconi 57070 Metz France State Key Laboratory on Advanced Optical Communication Systems and Networks Peking University Beijing 100871 China

In this article, the fabrication process of annular photonic crystals on silicon-on-insulator wafers was addressed for the first time. A self-alignment procedure for nanofabrication using atomic layer deposition and sacrificial etching was established to place accurately nanosized dielectric rods in nanosized circular air holes. Avoiding the challenging electron-beam lithography alignment, this method achieves atomic level precision and shows high stability. © 2009 American Vacuum Society.

关键词： Atomic layer deposition

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Linear support vector machine based on kernel function

引用

Journal of Computational Information Systems 2009年第4期5卷 1089-1095页

作者： Gao, Shang Hu, Xuekun Zhang, Zaiyue Cao, Cungen School of Computer Science and Engineering Jiangsu University of Science and Technology Zhenjiang 212003 China Provincial Key Laboratory of Computer Information Processing Technology Soochow University Suzhou 215006 China Institute of Computing Technology The Chinese Academy of Sciences Beijing 100080 China

Support vector machine is kind of novel machine learning method, based on statistical learning theory, which becomes the hotspot of machine learning because of its excellent learning performance. The method of support vector machine has been developed for solving classification and regression problems. Training a support vector machine requires the solutions of a very large quadratic programming problem. The algorithm is usually slow when there are many data. In order to improve the running speed, three regression models based on kernel function are introduced. One of three models is changed into a system of linear equations problem, the other models are changed into linear programming problems and their dual problems are given. Simulation results show the effectiveness of the methods, and the computation complexity are largely reduced. The kernel function and the parameter of models selection are compared and analyzed by means of an example. © 2009 Binary Information Press August, 2009.

关键词： Support vector machines

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Identity-Based Hybrid Signcryption

Identity-Based Hybrid Signcryption

引用

International Conference on Availability, Reliability and Security, ARES

作者： Fagen Li Masaaki Shirase Tsuyoshi Takagi School of Computer Science and Engineering University of Electronic Science and Technology Chengdu China School of Systems Information Science Future University-Hakodate Hakodate Japan Key Laboratory of Computer Networks and Information Security Xidian University Xi'an China

Signcryption is a cryptographic primitive that fulfills both the functions of digital signature and public key encryption simultaneously, at a cost significantly lower than that required by the traditional signature-then-encryption approach. In this paper, we address a question whether it is possible to construct a hybrid signcryption scheme in identity-based setting. This question seems to have never been addressed in the literature. We answer the question positively in this paper. In particular, we extend the concept of signcryption key encapsulation mechanism to the identity-based setting. We show that an identity-based signcryption scheme can be constructed by combining an identity-based signcryption key encapsulation mechanism with a data encapsulation mechanism. We also give an example of identity-based signcryption key encapsulation mechanism.

关键词： Identity-based encryption Public key cryptography Elliptic curve cryptography Public key computer network reliability Information security Digital signatures Cost function Data encapsulation Authentication

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A Road Segmentation and Road Type Identification Approach Based on New-Type Histogram Calculation

A Road Segmentation and Road Type Identification Approach Ba...

引用

Congress on Image and Signal Processing, CISP

作者： Li Zhang Er-yong Wu School of Computer Science Hangzhou Dianzi University Hangzhou China Zhejiang Provincial Key Laboratory of Information Network Technology University of Zhejiang Hangzhou China

By analyzing the characteristics of off-road images, a new and computationally efficient algorithm of road segmentation and road type identification for autonomous land vehicle (ALV) navigation system based on the proposed new-type histogram calculation was established. The new-type histogram is a new image, not a curve. It is also directional. It makes a statistic of the pixels under some special direction. With the histogram images, each pixel in the original image is given a threshold separately, thus the road images are correctly segmented. Moreover, the new-type histogram image could be used to identify road type. It avoids the deficiency that road images are wrongly segmented by reason that the preset road model does not fit in the real scene in the conventional methods. The proposed method does not need any extraction of the relevant information in the image (texture of the road, shadows, road edges, etc.). The method is evaluated on thousands of the cross-country road images under various lighting conditions. The experimental results demonstrate the method's accuracy, feasibility and robustness. It increases the segmentation accuracy to an extent. This would be a potentially significant contribution to the active area of road segmentation in the ALV navigation system.

关键词： Histograms Roads Image segmentation Navigation Image analysis Algorithm design and analysis Land vehicles Statistics Pixel Layout

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An algorithm for dynamic optimal path selection with constraint

引用

Journal of Computational Information Systems 2009年第5期5卷 1425-1431页

作者： Qi, Xiaogang Liu, Lifang Liu, Sanyang Department of Applied Mathematics Xidian University Xi'an 710071 China School of Computer Science and Technology Xidian University Xi'an 710071 China State Key Laboratory of Integrated Service Networks Xidian University Xi'an 710071 China

Optimal path selection (OPS) with unique or multiple constraints is one of key issues in the dynamic networks, in which arc' weight metric is an interval number. Firstly, some existing solutions for this problem are analyzed, and some shortages and flaws are pointed out. Secondly, regularities of distribution of the summation of multiple independent random numbers with same and different distributions are analyzed and formulated by data simulating and fitting. Furthermore, an algorithm named DOPS_Const for the OPS with an additive arc weight is proposed based on the above analysis, and the randomness and subjectivity in path selection can be avoided according to the algorithm. Finally, the theoretical and statistical probabilities of the selected path satisfying the given constraint are compared, and our algorithm is feasible and valid to solve the OPS with constraint in the dynamic networks. Copyright © 2009 Binary Information Press.

关键词： Information systems

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