检索结果-内蒙古大学图书馆

17th Monterey Workshop on Large-Scale Complex IT Systems, LSCITS 2012

作者： Cliff, Dave Northrop, Linda UK Large Scale Complex IT System Initiative Department of Computer Science University of Bristol Bristol BS8 1UB United Kingdom Research Technology and System Solutions Program Software Engineering Institute Carnegie-Mellon University Pittsburgh PA 15213 United States

ISBN: (纸本)9783642340581

We argue here that, in recent years, the world's financial markets have become a globally interconnected complex adaptive ultra-large-scale socio-technical system-of-systems, and that this has important consequences for how the financial markets should be engineered and managed in future. Major failures in the financial markets can now occur at super-human speeds, as was witnessed in the "Flash Crash" of May 6th 2010. Events such as the Flash Crash may become more commonplace in future, unless lessons are learned from other fields where complex adaptive socio-technical systems-of-systems have to be engineered for high-integrity, safety-critical applications. In this document we review the literature on failures in risky technology and high-integrity approaches to safety-critical SoS engineering. We conclude with an argument that, in the specific case of the global financial markets, there is an urgent need to develop major national strategic modeling and predictive simulation capabilities, comparable to national-scale meteorological monitoring and modeling capabilities. The intent here is not to predict the price-movements of particular financial instruments or asset classes, but rather to provide test-rigs for principled evaluation of systemic risk, estimating probability density functions over spaces of possible outcomes, and thereby identifying potentially high-consequence failure modes in the simulations, before they occur in real life, by which time it is typically too late. © 2012 Springer-Verlag.

关键词： Information technology

来源：评论

学校读者我要写书评

暂无评论

On the modeling of uplink inter-cell interference based on proportional fair scheduling

On the modeling of uplink inter-cell interference based on p...

引用

IEEE Wireless Communications and Networking Conference Workshops (WCNCW)

作者： Hina Tabassum Ferkan Yilmaz Zaher Dawy Mohamed Slim Alouini Electrical Engineering Program King Abdullah University for Science and Technology Thuwal Makkah Saudi Arabia Department of Electrical and Computer Engineering American University of Beirut Beirut Lebanon

We derive a semi-analytical expression for the uplink inter-cell interference (ICI) assuming proportional fair scheduling (with a maximum normalized signal-to-noise ratio (SNR) criterion) deployed in the cellular network. The derived expression can be customized for different models of channel statistics that can capture path loss, shadowing, and fading. Firstly, we derive an expression for the distribution of the locations of the allocated user in a given cell. Then, we derive the distribution and moment generating function of the uplink ICI from one interfering cell. Finally, we determine the moment generating function of the cumulative uplink ICI from all interfering cells. The derived expression is utilized to evaluate important network performance metrics such as outage probability and fairness among users. The accuracy of the derived expressions is verified by comparing the obtained results to Monte Carlo simulations.

关键词： Signal to noise ratio Interference Shadow mapping Measurement Scheduling Rayleigh channels

来源：评论

学校读者我要写书评

暂无评论

Developing solar cell front contacts using an all inkjet printing process following the selective emitter approach

Developing solar cell front contacts using an all inkjet pri...

引用

IEEE Nanotechnology Materials and Devices Conference (NMDC)

作者： Ravi Shankar Keith W. Whites Ty Chen Steve Liker Charles Tamarin Nanoscience and Engineering Program Department Department of Electrical and Computer Engineering South Dakota School of Mines and Technology Rapid SD USA Trident Industrial Inkjet An ITW Company Brookfield CT USA

ISBN: (纸本)9781467328715

We present an approach for complete inkjet printing of solar cell front contacts for the implementation of "selective emitter approach", which can help in solar cell efficiency improvement. The fabrication of optimized emitters that can allow the low recombination below the silver front contact is an important process in solar cell fabrication. This selective emitter approach presents a heavily doped layer beneath the electrode and lightly doped regions between the electrode grids. Selective opening of the anti reflection coating is needed to implement this combination of heavily and lightly doped regions. This was achieved using an inkjet approach by printing an etchant-dopant ink followed by the printing of a diffusion barrier using a dielectric ink. Using a Trident Jet256S industrial printhead we created etched pattern with etch width -50 μm. Once this pattern was created, the metallic front contact grid was printed using a silver nano-ink on top of the etched regions. Inkjet printed silver front contact grid with line width -75 μm was printed successfully.

关键词： Solar cells Efficiency and cost reduction Silver conductive ink Inkjet Selective emitter front contact ink jet printing emitters solar cells Diffusion barrier etched pattern Antireflection coatings Grid Printing grids CONTACT Electrodes

来源：评论

学校读者我要写书评

暂无评论

Liquid‐Crystal Polymers: Topography from Topology: Photoinduced Surface Features Generated in Liquid Crystal Polymer Networks (Adv. Mater. 41/2013)

引用

Advanced Materials 2013年第41期25卷

作者： Michael E. McConney Angel Martinez Vincent P. Tondiglia Kyung Min Lee Derrick Langley Ivan I. Smalyukh Timothy J. White Air Force Research Laboratory Materials and Manufacturing Directorate 3005 Hobson Way WPAFB OH 45434 USA Department of Physics Liquid Crystal Materials Research Center Department of Electrical Computer and Energy Engineering and Materials Science Engineering Program University of Colorado Boulder Colorado 80309 USA Renewable and Sustainable Energy Institute National Renewable Energy Laboratory and University of Colorado Boulder Colorado 80309 USA Air Force Institute of Technology Department of Electrical and Computer Engineering 2950 Hobson Way WPAFB OH 45433 USA

来源：评论

学校读者我要写书评

暂无评论

Performance evaluation of D3LS and NCLS smart antenna in mobile communications

Performance evaluation of D3LS and NCLS smart antenna in mob...

引用

International Symposium on Antennas and Propagation (ISAP)

作者： Akkarat Boonpoonga Phichet Nilsuwan Jukkrit Tagapanij Phaophak Sirisuk Department of Electrical and Computer Engineering Faculty of Engineering King Mongkuts University of Technology North Bangkok Bangkok Thailand The Electrical Engineering Graduate Program Faculty of Engineering Mahanakorn University of Technology Bangkok Thailand Department of Telecommunication Engineering Mahanakorn University of Technology Bangkok Thailand International College King Mongkut's Institute of Technology Ladkrabang Bangkok Thailand

In this paper, the performance evaluation of a smart antenna using D3LS and NCLS algorithms has been presented. The simulations are conducted with the scenario of mobile communication systems. They have confirmed the feasibility of the D3LS and NCLS smart antenna applied to mobile communications. It should be note that the smart antenna employed in this paperis purely blind and single snapshot operation. The simulation results show good performance of the smart antenna.

关键词： Direction of arrival estimation Interference Mobile communication Mobile antennas Adaptive arrays Estimation

来源：评论

学校读者我要写书评

暂无评论

Smart antenna using a combination of D3LS and NCLS algorithms

Smart antenna using a combination of D3LS and NCLS algorithm...

引用

International Conference on Electrical engineering/Electronics, computer, Telecommunications and Information technology, ECTI-CON

作者： Phichet Nilsuwan Akkarat Boonpoonga Jukkrit Tagapanij Phaophak Sirisuk The Electrical Engineering Graduate Program Faculty of Engineering Mahanakorn University of Technology Bangkok Thailand Department of Electrical and Computer Engineering Faculty of Engineering King Mongkuts University of Technology North Bangkok Bangkok Thailand Department of Telecommunication Engineering Mahanakorn University of Technology Bangkok Thailand International College King Mongkut's Institute of Technology Ladkmbang Bangkok Thailand

ISBN: (纸本)9781467320269

This paper presents a smart antenna system using a combination of nonconventional least square (NCLS) optimization and direct data domain least square (D3LS) for direction-of-arrival (DOA) estimation and beamforming, respectively. In the proposed system, NCLS optimization is utilized to estimate DOA of incoming signal first. The estimated DOA is then assisted for initial processing of D3LS in beamforming. The performance in term of estimated signal amplitude and estimated DOA of the proposed system is evaluated via simulations.

关键词： Direction of arrival estimation Optimization Interference Adaptive arrays Estimation Arrays

来源：评论

学校读者我要写书评

暂无评论

Genetic algorithms to automatic weld bead detection in double wall double image digital radiographs

Genetic algorithms to automatic weld bead detection in doubl...

引用

Congress on Evolutionary Computation

作者： Marcel Kroetz Tania M. Centeno Myriam R. Delgado Marcelo Felisberto Luís Alberto Lucas Leyza B. Dorini Vitor Fylyk Allan Vieira Graduate Program on Electrical Engineering and Computer Science (CPGEI) Federal University of Technology of Paraná (UTFPR) Brazil Academic Department of Eletronics (DAELN) Federal University of Technology of Paraná (UTFPR) Brazil

ISBN: (纸本)9781467315104

This paper presents a pioneering approach for weld bead detection in radiographic images obtained by the Double Wall Double Image (DWDI) technique. Such task constitutes an essential step for several high level processes, such as fully automatic flaw identification on welded joints. Sets of sample pixels, corresponding to candidate solutions provided by a genetic algorithm (GA), are compared to pre-defined synthetic weld bead and pipe models in an image matching procedure. The fitness of each set (individual) is evaluated based on a linear combination of its genotype (evaluated by a heuristic function) and phenotype. The evolutionary process automatically selects the best individual in the population and, thus, provides information such as position, orientation and dimension of the detected object. The proposed approach successfully detects pipes and weld beads in radiographic images of different complexities, encouraging future works.

关键词： Welding Genetic algorithms Radiography Equations Mathematical model Biological cells Joints

来源：评论

学校读者我要写书评

暂无评论

On the ergodic secret message capacity of the wiretap channel with finite-rate feedback

On the ergodic secret message capacity of the wiretap channe...

引用

IEEE International Symposium on Information Theory

作者： Zouheir Rezki Ashish Khisti Mohamed-Slim Alouini Electrical Engineering Program Physical Science and Engineering Division King Abdullah University of Science and Technology Thuwal Makkah Saudi Arabia Electrical and Computer Engineering Department University of Toronto Toronto ONT Canada Electrical Engineering Program Physical Science and Engineering (PSE) Division King Abdullah University of Science and Technology Thuwal Makkah Saudi Arabia

We study the secret message capacity of an ergodic block fading wiretap channel with partial channel state information at the transmitter and perfect channel state information at the receivers. We consider that in addition to the statistics of the main and the eavesdropper channel state information (CSI), the sender is provided by the legitimate receiver with a q-bit feedback, at the beginning of each coherence block, through an error-free feedback channel, with capacity q bits. We establish upper and lower bounds on the secrecy capacity. We show that a positive secrecy rate is achievable even when the feedback is at the end of each coherence block and q = 1. We also show that the lower and the upper bounds coincide asymptotically as q → ∞. Finally, asymptotic analysis at high Signal-to-Noise Ratio (SNR) are presented where it is found that the capacity is bounded at high-SNR and present a simple suboptimal scalar quantizer that is capacity achieving, without the need of any numerical optimization, as q → ∞. When applied to Rayleigh fading channels, we show that, at high-SNR, a 4-bit feedback achieves 90% of the secrecy capacity when perfect main CSI is available at the transmitter.

关键词： Coherence Upper bound Fading Automatic repeat request Signal to noise ratio Transmitters Receivers

来源：评论

学校读者我要写书评

暂无评论

Reports of the AAAI 2011 conference workshops

Reports of the AAAI 2011 conference workshops

引用

作者： Agmon, Noa Agrawal, Vikas Aha, David W. Aloimonos, Yiannis Buckley, Donagh Doshi, Prashant Geib, Christopher Grasso, Floriana Green, Nancy Johnston, Benjamin Kaliski, Burt Kiekintveld, Christopher Law, Edith Lieberman, Henry Mengshoel, Ole J. Metzler, Ted Modayil, Joseph Oard, Douglas W. Onder, Nilufer O'Sullivan, Barry Pastra, Katerina Precup, Doina Ramachandran, Sowmya Reed, Chris Sariel-Talay, Sanem Selker, Ted Shastri, Lokendra Singh, Satinder Smith, Stephen F. Srivastava, Siddharth Sukthankar, Gita Uthus, David C. Williams, Mary-Anne Department of Computer Science University of Texas at Austin United States Center for Knowledge Driven Information Systems Infosys Labs India Adaptive Systems Section Naval Research Laboratory Washington DC United States Department of Computer Science University of Maryland College Park United States EMC's Center of Excellence in Ireland Research Europe at EMC Ireland Department of Computer Science University of Georgia United States School of Informatics University of Edinburgh United Kingdom Department of Computer Science University of Liverpool United Kingdom Department of Computer Science University of North Carolina Greensboro United States Faculty of Engineering and Information Technology University of Technology Sydney Australia VeriSign Inc. United States Department of Computer Science University of Texas at El Paso United States Machine Learning Department Carnegie Mellon University United States Massachusetts Institute of Technology Media Laboratory United States Carnegie Mellon University's Silicon Valley Campus United States Darrell W. Hughes Program for Religion and Science Dialogue Oklahoma City University United States Department of Computing Science University of Alberta Canada College of Information Studies Institute for Advanced Computer Studies University of Maryland College Park United States Department of Computer Science Michigan Technological University United States Department of Computer Science University College Cork Ireland Cognitive Systems Research Insitute Athens Greece School of Computer Science McGill University Canada Stottler Henke Inc. United States School of Computing University of Dundee United Kingdom Department of Computer Engineering Istanbul Technical University Turkey Convergence Lab Infosys Technologies Ltd. United States Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor United States Robotics Institute Carnegie Mellon University United States University of Wisconsin

The AAAI-11 workshop program was held Sunday and Monday, August 7-18, 2011, at the Hyatt Regency San Francisco in San Francisco, California USA. The AAAI-11 workshop program included 15 workshops covering a wide range of topics in artificial intelligence. The titles of the workshops were Activity Context Representation: Techniques and Languages;Analyzing Microtext;Applied Adversarial Reasoning and Risk Modeling;Artificial Intelligence and Smarter Living: The Conquest of Complexity;Artifiicial Intelligence for Data Center Management and Cloud Computing;Automated Action Planning for Autonomous Mobile Robots;Computational Models of Natural Argument;Generalized Planning;Human Computation;Human-Robot Interaction in Elder Care;Interactive Decision Theory and Game Theory, 2010;Language-Action Tools for Cognitive Artificial Agents: Integrating Vision, Action, and Language;Lifelong Learning from Sensorimotor Experience;Plan, Activity, and Intent Recognition;and Scalable Integration of Analytics and Visualization. This article presents short summaries of those events. Copyright © 2012, Association for the Advancement of Artificial Intelligence. All rights reserved.

关键词： Human robot interaction

来源：评论

学校读者我要写书评

暂无评论

Joint scheduling for dual-hop block-fading broadcast channels

Joint scheduling for dual-hop block-fading broadcast channel...

引用

IEEE Globecom Workshops

作者： Ammar Zafar Mohammad Shaqfeh Mohamed-Slim Alouini Hussein Alnuweiri EE Program King Abdullah University for Science and Technology Thuwal Makkah Saudi Arabia Department of Electrical and Computer Engineering Texas A and M University Qatar Doha Qatar

In this paper, we propose joint user-and-hop scheduling over dual-hop block-fading broadcast channels in order to exploit multi-user diversity gains and multi-hop diversity gains all together. To achieve this objective, the first and second hops are scheduled opportunistically based on the channel state information and as a prerequisite we assume that the relay, which is half-duplex and operates using decode-and-forward, is capable of storing the received packets from the source until the channel condition of the destined user becomes good to be scheduled. We formulate the joint scheduling problem as maximizing the weighted sum of the long term achievable rates by the users under a stability constraint, which means that on the long term the rate received by the relay should equal the rate transmitted by it, in addition to constant or variable power constraints. We show that this problem is equivalent to a single-hop broadcast channel by treating the source as a virtual user with an optimal priority weight that maintains the stability constraint. We show how to obtain the source weight either off-line based on channel statistics or on real-time based on channel measurements. Furthermore, we consider special cases including the maximum sum rate scheduler and the proportional fair scheduler. We demonstrate via numerical results that our proposed joint scheduling scheme enlarges the rate region as compared with a scheme that employs multi-user scheduling alone.

关键词： Relays Joints Resource management Throughput Real-time systems Magnetohydrodynamics Multiuser detection

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：