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2013 IEEE International Conference on RFID-Technologies and Applications, RFID-TA 2013

作者： Alhawari, A.R.H. Ismail, A. Jalal, A.S.A. Raja Abdullah, R.S.A. Rasid, M.F.A. Centre of Excellence for Wireless and Photonics Network Department of Computer and Communication Systems Engineering Universiti Putra Malaysia Selangor Darul Ehsan Malaysia Universiti Putra Malaysia Malaysia College of Information Engineering Al-Nahrain University 10070 Al-Jadriya Complex Baghdad Iraq

ISBN: (纸本)9781479921140

An inductively coupled feed novel technique is proposed to enhance the performance of RFID tag antennas. The applied feeding concept comprises of two opposing symmetrical U-shaped structures to feed a radiating body. It is a simple alternative to effectively match between the antenna impedance with the chip impedance from the flexible augmentation of equivalent inductance to the radiating body. The proposed feeding method offers better expectation of performance among antenna size, impedance, and gain at the size of 50 × 70 × 1.6 mm3. The peak gain of the proposed tag antenna is 2.5 dBi at its operating frequency, which is higher among conventional tag antennas. Measured results indicate that this tag antenna has a good impedance matching characteristic at 904-937 MHz (power reflection coefficient better than -3 dB). The comparison between the simulation and measurement results verified the proposed technique capability to improve overall performance of the tag antennas. © 2013 IEEE.

关键词： Radio frequency identification (RFID)

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Checkerboard LCS and the mixing characteristics of geophysical vortices 51

Checkerboard LCS and the mixing characteristics of geophysic...

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51st AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition 2013

作者： Lipinski, Doug Mohseni, Kamran Department of Mechanical and Aerospace Engineering University of Florida Gainesville FL 32611 United States Department of Electrical and Computer Engrineering University of Florida Gainesville FL 32611 United States Institute of Network Autonomous Systems University of Florida Gainesville FL 32611 United States

ISBN: (数字)9781624101816

ISBN: (纸本)9781624101816

A checkerboard pattern formed by the intersection of attracting and repelling Lagrangian coherent structures has been observed in several geophysical vortex flows. A mechanism for tlie formation of such checkerboard patterns is proposed and investigated in the context of two simple analytical flows. In these flows, hyperbolic stretching in two dimensions is enhanced by a huge, sheared velocity in the third dimension. Perturbations to the system then create localized regions of higher stretching in the flow, leading to the checkerboard pattern seen in the resulting LCS. This same pattern is shown in two geophysical flows, a warm-core ring shed from the Loop Current in the Gulf of Mexico and a simulation of Hurricane Rita. The checkerboard pattern appeals in the boundary layers of these flows due to the influence of friction and the corresponding separation of the flow from the ocean-atmosphere interface. © 2013 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Vortex flow

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Energy-aware and self-adaptive anomaly detection scheme based on network tomography in mobile ad hoc networks

Energy-aware and self-adaptive anomaly detection scheme base...

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作者： Wang, Wei Wang, Huiran Wang, Beizhan Wang, Yaping Wang, Jiajun School of Computer Science Xi'An Polytechnic University Xi'an 710048 China Key Laboratory for Intelligent Network and Network Security Xi'An Jiaotong University Ministry of Education Xi'an 710049 China School of Software Xiamen University Xiamen 361005 China Department of Industrial and Systems Engineering Texas AandM University TX 77843 United States

Anomaly detection is indispensable for satisfying security services in mobile ad hoc network (MANET) applications. Often, however, a highly secure mechanism consumes a large amount of network resources, resulting in network performance degradation. To shift intrusion detection from existing security-centric design approaches to network performance centric design schemes, this paper presents a framework for designing an energy-aware and self-adaptive anomaly detection scheme for resource constrained MANETs. The scheme uses network tomography, a new technique for studying internal link performance based solely on end-to-end measurements. With the support of a module comprising a novel spatial-time model to identify the MANET topology, an energy-aware algorithm to sponsor system service, a method based on the expectation maximum to infer delay distribution, and a Self-organizing Map (SOM) neural network solution to profile link activity, the proposed system is capable of detecting link anomalies and localizing malicious nodes. Consequently, the proposed scheme offers a trade-off between overall network security and network performance, without causing any heavy network overload. Moreover, it provides an additional approach to monitor the spatial-time behavior of MANETs, including network topology, link performance and network security. The effectiveness of the proposed schemes is verified through extensive experiments. © 2012 Elsevier Inc. All rights reserved.

关键词： Mobile ad hoc networks

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A Dynamic Probabilistic Marking Approach with Multi-Tag for Tracing ICMP-Based DoS Attacks

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Wuhan University Journal of Natural Sciences 2013年第6期18卷 484-488页

作者： CHEN Xiuzhen MA Jin LI Shenghong CHEN Ken SERHROUCHNI Ahmed State Key Laboratory for Manufacturing Systems Engineering Xi'an Jiaotong University School of Information Security Engineering Shanghai Jiao Tong University Les Laboratoires de l'Institut Galilée Université Paris 13Paris 93430 France Network and Computer Science Department Telecom ParisTech Paris 75634 France

This paper presents a dynamic probabilistic marking algorithm with multiple routing address tags, which allows the vic- tim to traceback the origin of ICMP （Internet Control Message Pro- tocol）-based direct and reflective DoS attacks. The proposed ap- proach makes full use of scalable data space of ICMP packet to achieve multiple information tags. The difference between this pro- posal and previous proposals lies in two points. First, the number of packets needed by the victim to reconstruct the attack path is greatly reduced because of three key mechanisms： multi-tag, uniform left- over probability, and tag location choice based on the module of accommodated tag numbers within a packet. Second, the true origin of both direct and reflective ICMP-based DoS attacks can be traced.

关键词： network security denial of service IP traceback dynamic probabilistic marking multi-tag

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Base station location optimisation in LTE using Genetic Algorithm

Base station location optimisation in LTE using Genetic Algo...

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International Conference on Information and Communication Technology Convergence (ICTC)

作者： Aida Al-Samawi Aduwati Sali Nor Kamariah Noordin Mohamed Othman Fazirulhisyam Hashim Dept. of Computer & Communication Systems Engineering UPM Selangor Malaysia Department of Communication Technology and Network UPM Selangor Malaysia

Long Term Evolution (LTE) is a promising technology for mobile communication. This technology is based on reducing the base stations cell size, which will lead to an increment in the number of base stations. As a result, energy consumption will increase. Therefore, there is a need to optimize the LTE base stations transmission power and location to comply with the green technology. In this paper, a Genetic Algorithm (GA) optimization technique is proposed to estimate the best locations for LTE base stations, the optimum number of base stations to be used and the minimum transmission power needed for a given scenario. The proposed system is applied in Kuala Lumpur, Malaysia.

关键词： Genetic algorithms Base stations Optimization Transmitting antennas Long Term Evolution Planning

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Reflectance response of optical fiber sensor coated with graphene oxide towards ethanol

Reflectance response of optical fiber sensor coated with gra...

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2013 IEEE 4th International Conference on Photonics, ICP 2013

作者： Shabaneh, A.A. Arasu, P.T. Girei, S.H. Paiman, S. Mahdi, M.A. Yaacob, M.H. Huang, N.M. Wireless and Photonics Network Research Centre Engineering and Technology Complex University Putra Malaysia 43400 Serdang Selangor Malaysia Department of Computer and Communications Systems Engineering Faculty of Engineering University Putra Malaysia 43400 Serdang Selangor Malaysia Department of Physics Faculty of Science University Putra Malaysia 43400 Serdang Selangor Malaysia Low Dimensional Materials Research Centre Physics Department University of Malaya 50603 Kuala Lumpur Malaysia

ISBN: (纸本)9781467360753

In this paper, optical multimode fiber reflectance sensor for ethanol with different concentrations in water was developed. The sensor was coated with graphene oxide (GO) by drop-casting technique. The dynamic response of GO nanostructured thin film coated on optical multimode fiber tip exposed to ethanol liquid was investigated. GO thin film was characterized via Raman microscopy and Scanning Electron Microscopy (SEM). The reflectance decreased by 37% when the fiber tip was exposed to 5% concentration of ethanol in water. The sensor shows fast response and recovery as low as 30 s and 45 s, respectively. © 2013 IEEE.

关键词： Multimode fibers

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Performance analysis of centralized, distributed and hybrid demand load control architecture for smart power grid

Performance analysis of centralized, distributed and hybrid ...

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IEEE International Conference on Electro-Information Technology

作者： Sami S. Alwakeel Musaed A. Alhussein Muhammad Ammad-uddin Department of Computer Engineering King Saud University Riyadh Saudi Arabia Sensor Network and Cellular systems Center Tabuk University Saudi Arabia

Demand Response (DR) technology of future smart grid makes it possible to have two-way communication between utility service providers and home appliances inside the customer premises. This state-of-art technology is implements various smart devices such as: smart meters, smart load controller, smart thermostats, smart switches and home energy consoles. Furthermore, DR technology can reform the electricity system and provide clients with new information and options to manage their electricity use. Customers can reduce or shift their power usage during peak demand periods in response to real time-based rates or other forms of financial incentives. Besides, demand response policy plays a vital role in modernizing several electric energy domains including: grid reliability, pricing, infrastructure planning and design, emergency response, operations, and usage deferral decisions. In previous studies Demand Load for smart power grid is mostly implemented in a centralized approach. The significance of this study is to propose a hybrid Demand response (HDR) architecture. The study investigates the performance of DR in the context of a centralized, fully Distributed and Hybrid fashion. The research results shows that our proposed HDR scheme performances outperform all other existing demand response policies.

关键词： Home appliances Load management Load modeling computer architecture Real-time systems Smart grids Performance evaluation

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Efficient public key cryptosystem resilient to key leakage chosen ciphertext attacks 1

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Cryptographers' Track at the RSA Conference 2013, CT-RSA 2013

作者： Liu, Shengli Weng, Jian Zhao, Yunlei Dept. of Computer Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China Department of Computer Science Emergency Technology Research Center of Risk Evaluation and Prewarning on Public Network Security Jinan University China Software School Fudan University Shanghai 201203 China State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Beijing 100093 China Shanghai Key Laboratory of Scalable Computing and Systems Shanghai China

ISBN: (数字)9783642360954

ISBN: (纸本)9783642360947

Leakage-resilient public key encryption (PKE) schemes are designed to resist "memory attacks", i.e., the adversary recovers the cryptographic key in the memory adaptively, but subject to constraint that the total amount of leaked information about the key is bounded by some parameter λ. Among all the IND-CCA2 leakage-resilient PKE proposals, the leakage-resilient version of the Cramer-Shoup cryptosystem (CS-PKE), referred to as the KL-CS-PKE scheme proposed by Naor and Segev in Crypto09, is the most practical one. But, the key leakage parameter λ and plaintext length m of KL-CS-PKE are subject to λ + m ≤ log q - ω(log κ), where κ is security parameter and q is the prime order of the group on which the scheme is based. Such a dependence between λ and m is undesirable. For example, when λ (resp., m) approaches to log q, m (resp., λ) approaches to 0. In this paper, we designed a new variant of CS-PKE that is resilient to key leakage chosen ciphertext attacks. Our proposal is λ ≤ log q - ω(log κ) leakage-resilient, and the leakage parameter λ is independent of the plaintext space that has the constant size q (exactly the same as that in CS-PKE). The performance of our proposal is almost as efficient as the original CS-PKE. As far as we know, this is the first leakage-resilient CS-type cryptosystem whose plaintext length is independent of the key leakage parameter, and is also the most efficient IND-CCA2 PKE scheme resilient to up to log q - ω(log κ) leakage. © 2013 Springer-Verlag.

关键词： Public key cryptography

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Efficient Handling of Lock Hand-off in DSM Multiprocessors with Buffering Coherence Controllers

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Journal of computer Science & Technology 2012年第1期27卷 75-91页

作者： Benjamín Sahelices Agustín de Dios Pablo Ibáez Víctor Vials-Yúfera José María Llabería Computer Science Department and HiPEAC European Network of Excellence University of Valladolid Valladolid Spain Computer Science and Systems Engineering Department I3A Research Institute and HiPEAC European Network of Excellence University of Zaragoza Zaragoza Spain Computer Architecture Department and HiPEAC European Network of Excellence Polytechnic University of Catalua Barcelona Spain

Synchronization in parallel programs is a major performance bottleneck in multiprocessor systems. Shared data is protected by locks and a lot of time is spent on the competition arising at the lock hand-off. In order to be serialized, requests to the same cache line can either be bounced （NACKed） or buffered in the coherence controller. In this paper, we focus mainly on systems whose coherence controllers buffer requests. In a lock hand-off, a burst of requests to the same line arrive at the coherence controller. During lock hand-off only the requests from the winning processor contribute to progress of the computation, since the winning processor is the only one that will advance the work. This key observation leads us to propose a hardware mechanism we call request bypassing, which allows requests from the winning processor to bypass the requests buffered in the coherence controller keeping the lock line. We present an inexpensive implementation of request bypassing that reduces the time spent on all the execution phases of a critical section （acquiring the lock, accessing shared data, and releasing the lock） and which, as a consequence, speeds up the whole parallel computation. This mechanism requires neither compiler or programmer support nor ISA or coherence protocol changes. By simulating a 32-processor system, we show that using request bypassing does not degrade but rather improves performance in three applications with low synchronization rates, while in those having a large amount of synchronization activity （the remaining four）, we see reductions in execution time and in lock stall time ranging from 14% to 39% and from 52% to 7170, respectively. We compare request bypassing with a previously proposed technique called read combining and with a system that bounces requests, observing a significantly lower execution time with the bypassing scheme. Finally, we analyze the sensitivity of our results to some key hardware and software parameters.

关键词： distributed shared memory multiprocessors synchronization buffer coherence controller request bypass

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Accountable authority identity-based encryption with public traceability 1

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Cryptographers' Track at the RSA Conference 2013, CT-RSA 2013

作者： Lai, Junzuo Deng, Robert H. Zhao, Yunlei Weng, Jian School of Information Systems Singapore Management University Singapore Singapore Software School Fudan University China State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences China Department of Computer Science Emergency Technology Research Center of Risk Evaluation and Prewarning on Public Network Security Jinan University China Shanghai Key Laboratory of Integrate Administration Technologies for Information Security China

ISBN: (数字)9783642360954

ISBN: (纸本)9783642360947

At Crypto'07, Goyal introduced the notion of accountable authority identity-based encryption (A-IBE) in order to mitigate the inherent key escrow problem in identity-based encryption, and proposed two concrete constructions. In an A-IBE system, if the private key generator (PKG) distributes a decryption key or produces an unauthorized decryption box for a user maliciously, it runs the risk of being caught and sued in the court of law with the help of a tracing algorithm. Subsequent efforts focused on constructions of A-IBE schemes with enhanced security. In these A-IBE constructions, the tracing algorithm needs to take a user's decryption key as input. If the user lost his key or is deliberately uncooperative in court, then we cannot implicate the PKG or the user. An interesting open problem left by Goyal et al. at CCS'08 is to consider the possibility of tracing a decryption box using only a public tracing key, or with the assistance of a tracing authority. In this paper, we address this problem positively. We first extend the original model of A-IBE to accommodate public traceability, and then propose an A-IBE scheme in the new model. To the best of our knowledge, the proposed scheme is the first A-IBE with public traceability. © 2013 Springer-Verlag.

关键词： Accountable Authority Identity Based Encryption Public Traceability

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