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Isotropic hashing

Isotropic hashing

引用

26th Annual Conference on Neural Information Processing systems 2012, NIPS 2012

作者： Kong, Weihao Li, Wu-Jun Shanghai Key Laboratory of Scalable Computing and Systems Department of Computer Science and Engineering Shanghai Jiao Tong University China

ISBN: (纸本)9781627480031

Most existing hashing methods adopt some projection functions to project the original data into several dimensions of real values, and then each of these projected dimensions is quantized into one bit (zero or one) by thresholding. Typically, the variances of different projected dimensions are different for existing projection functions such as principal component analysis (PCA). Using the same number of bits for different projected dimensions is unreasonable because larger-variance dimensions will carry more information. Although this viewpoint has been widely accepted by many researchers, it is still not verified by either theory or experiment because no methods have been proposed to find a projection with equal variances for different dimensions. In this paper, we propose a novel method, called isotropic hashing (IsoHash), to learn projection functions which can produce projected dimensions with isotropic variances (equal variances). Experimental results on real data sets show that IsoHash can outperform its counterpart with different variances for different dimensions, which verifies the viewpoint that projections with isotropic variances will be better than those with anisotropic variances.

关键词： Principal component analysis

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A generic construction of accountable decryption and its applications

A generic construction of accountable decryption and its app...

引用

17th Australasian Conference on Information Security and Privacy, ACISP 2012

作者： Zhou, Xuhua Ding, Xuhua Chen, Kefei Shanghai Jiao Tong University China Singapore Management University Singapore Singapore Shanghai Key Laboratory of Scalable Computing and Systems Shanghai China

ISBN: (纸本)9783642314476

We propose a new cryptographic notion called accountable decryption by which, given a ciphertext, a decryptor proves both the correctness of his decryption and the plaintext authenticity to a public verifier. We define its security from three aspects: message confidentiality, soundness of verifiability and plaintext authenticity. Given any asymmetric or symmetric key encryption scheme, we propose a method to construct the corresponding accountable decryption scheme with provable security. To demonstrate its applications, we also present the constructions for predicate encryption and for public-key encryption with keyword search. © 2012 Springer-Verlag.

关键词： Public key cryptography

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Fast Viterbi map matching with tunable weight functions 12

Fast Viterbi map matching with tunable weight functions

引用

20th ACM SIGSPATIAL International Conference on Advances in Geographic Information systems, ACM SIGSPATIAL GIS 2012

作者： Wei, Hong Wang, Yin Forman, George Zhu, Yanmin Guan, Haibing Shanghai Key Lab. of Scalable Computing and Systems Shanghai Jiao Tong University China Hewlett-Packard Labs. Palo Alto CA United States

ISBN: (纸本)9781450316910

This paper describes a map matching program submitted to the ACM SIGSPATIAL Cup 2012. We first summarize existing map matching algorithms into three categories, and compare their performance thoroughly. In general, global max-weight methods using the Viterbi dynamic programming algorithm are the most accurate but the accuracy varies at different sampling intervals using different weight functions. Our submission selects a hybrid that improves upon the best two weight functions such that its accuracy is better than both and the performance is robust against varying sampling rates. In addition, we employ many optimization techniques to reduce the overall latency, as the scoring heavily emphasizes on speed. Using the training dataset with manually corrected ground truth, our Java-based program matched all 14,436 samples in 5 seconds on a dual-core 3.3 GHz iCore 3 processor, and achieved 98.9% accuracy. © 2012 ACM.

关键词： Dynamic programming

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Workload-aware opportunistic routing in multi-channel, multi-radio wireless mesh networks

Workload-aware opportunistic routing in multi-channel, multi...

引用

2012 9th Annual IEEE Communications Society Conference on Sensor, Mesh and Ad Hoc Communications and Networks, SECON 2012

作者： Wu, Fan Vaidya, Nitin Department of Computer Science and Engineering Shanghai Key Laboratory of Scalable Computing and Systems Shanghai Jiao Tong University China ECE Coordinated Science Lab University of Illinois Urbana-Champaign United States

ISBN: (纸本)9781467319058

Opportunistic routing emerged as a novel technique to cope with the problem of highly unpredictable and lossy wireless channels in urban wireless mesh networks. However, existing opportunistic routing protocols only consider single-radio wireless nodes, and assume that all the nodes work on the same channel, without exploiting possible concurrent transmissions by multi-radio nodes over orthogonal channels provided by IEEE 802.11 protocols. Examples show that simply integrating existing channel assignment schemes and the opportunistic routing technique may not achieve satisfactory system performance. In this paper, we present WACA, which is a Workload-Aware Channel Assignment algorithm for opportunistic routing in multi-channel, multi-radio wireless mesh networks. Evaluation results show that WACA always achieves highest average throughput among the evaluated algorithms, and its median throughput is at least 16.1% higher than the compared ones. © 2012 IEEE.

关键词： Mesh generation

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High availability through output continuity

High availability through output continuity

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2012 IEEE International Conference on Cluster computing Workshops, Cluster Workshops 2012

作者： Ye, Wei Dong, Yaozu Ma, Ruhui Liang, Alei Guan, Haibing Shanghai Key Laboratory of Scalable Computing and Systems Department of Computer Science and Engineering Shanghai Jiao Tong University Shanghai 200240 China Intel China Software Center Shanghai 200241 China

ISBN: (纸本)9780768548449

Virtual machine (VM) based state machine approaches, i.e. VM replication, provide high availability without source code modifications, unfortunately, existing VM replication approaches suffer from excessive replication overheads. On the other hand, machine state replication is an overly strong (and therefore less efficient) requirement for high availability in the networked client-server system. In this paper, we propose a generic and highly efficient high availability solution through output continuity. Output continuity considers a backup server as a valid replica as long as the responses generated so far are the same between the backup and primary servers, the server state is propagated from the primary server to the backup server if and only if the previous outputs from the backup and primary servers are different. © 2012 IEEE.

关键词： Fault tolerance

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Annihilators of fast discrete fourier spectra attacks

Annihilators of fast discrete fourier spectra attacks

引用

7th International Workshop on Security, IWSEC 2012

作者： Wang, Jingjing Chen, Kefei Zhu, Shixiong Department of Computer Science and Engineering Shanghai Jiaotong University Shanghai China Shanghai Key Laboratory of Scalable Computing and Systems Shanghai China Science and Technology on Communication Security Laboratory Chengdu China

ISBN: (纸本)9783642341168

Spectra attacks proposed recently are more data efficient than algebraic attacks against stream cipher. They are also time-and-space efficient. A measurement of the security of a stream cipher against spectra attacks is spectral immunity, the lowest spectral weight of the annihilator of the key stream. We study both the annihilator and the spectral immunity. We obtain a necessary and sufficient condition for the existence of low spectral weight annihilator and find it is more difficult to decide the (non)existence of the low weight annihilator for spectra attacks than for algebraic attacks. We also give some basic properties of annihilators and find the probability of a periodic sequence to be the annihilator of another sequence of the same period is low. Finally we prove that the spectral immunity is upper bounded by half of the period of the key stream. As a result, to recover any key stream, the least amount of bits required by spectra attacks is at most half of its period. © Springer-Verlag Berlin Heidelberg 2012.

关键词： Security of data

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Improving Unsegmented Network Coding for Opportunistic Routing in Wireless Mesh Network

Improving Unsegmented Network Coding for Opportunistic Routi...

引用

IEEE Wireless Communications and Networking Conference (WCNC)

作者： Chen, Chen Dong, Chao Wu, Fan Wang, Hai Peng, Laixian Nie, Jingnan Institute of Communications Engineering P.L.A. University of Science and Technology China Department of Computer Science and Engineering Shanghai Key Laboratory of Scalable Computing and Systems Shanghai Jiao Tong University China

ISBN: (纸本)9781467304375;9781467304368

Unsegmented network coding was incorporated into opportunistic routing to improve inefficient schedule of segmented network coding due to delayed feedback. However, most unsegmented network coding schemes fail to constrain the size of decoding window. Large decoding window not only challenges limited computational ability and decoding memory in practical environments, but also introduces large decoding delay, which is undesirable in delay sensitive applications. In this paper, we prove that the possibility of unacceptably large decoding window is innegligible, and verify the necessity of handling decoding window. To solve the issue, we argue that the number of unknown packets injected into the network must be strictly constrained at the source. Based on the idea, we improve unsegmented network coding scheme for opportunistic routing. Simulation results shows that the solution is robust to losses. In addition, to achieve optimal throughput, the redundancy factor should be selected larger than the reciprocal of end-to-end delivery ratio.

关键词： Network coding

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CATS: Cache Aware Task-Stealing based on online profiling in multi-socket multi-core architectures 12

CATS: Cache Aware Task-Stealing based on online profiling in...

引用

26th ACM International Conference on Supercomputing, ICS'12

作者： Chen, Quan Guo, Minyi Huang, Zhiyi Shanghai Key Laboratory of Scalable Computing and Systems Department of Computer Science Shanghai Jiao Tong University China Department of Computer Science University of Otago New Zealand

ISBN: (纸本)9781450313162

Multi-socket Multi-core architectures with shared caches in each socket have become mainstream when a single multi-core chip cannot provide enough computing capacity for high performance computing. However, traditional task-stealing schedulers tend to pollute the shared cache and incur severe cache misses due to their randomness in stealing. To address the problem, this paper proposes a Cache Aware Task-Stealing (CATS) scheduler, which uses the shared cache efficiently with an online profiling method and schedules tasks with shared data to the same socket. CATS adopts an online DAG partitioner based on the profiling information to ensure tasks with shared data can efficiently utilize the shared cache. One outstanding novelty of CATS is that it does not require any extra user-provided information. Experimental results show that CATS can improve the performance of memory-bound programs up to 74.4% compared with the traditional task-stealing scheduler. Copyright 2012 ACM.

关键词： Scheduling

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EEG-based fatigue classification by using parallel hidden Markov model and pattern classifier combination

EEG-based fatigue classification by using parallel hidden Ma...

引用

19th International Conference on Neural Information Processing, ICONIP 2012

作者： Sun, Hui Lu, Bao-Liang Center for Brain-Like Computing and Machine Intelligence Department of Computer Science and Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China MOE-Microsoft Key Lab. for Intelligent Computing and Intelligent Systems Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China Shanghai Key Laboratory of Scalable Computing and Systems Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China MOE Key Laboratory of Systems Biomedicine Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China

ISBN: (纸本)9783642344770

Fatigue is the most important reason leading to traffic accidents. In order to ensure traffic safety, various methods based on electroencephalogram (EEG) are proposed. But most of them, either regression or classification, are focused on the relationship between feature space and observation values, so the changing patterns of features are ignored or discarded. In this paper, we propose a new fatigue classification method by using parallel hidden-Markov-model and pattern classifier combination techniques, where each model represents a particular fatigue-high-related feature. In the experiment, subjects are asked to accomplish some simple tasks, and both their fatigue states and their EEG signals are recorded simultaneously. Experimental results indicate that the mean error rate obtained by using our new method are 11.15% for classifying 3 states and 16.91% for classifying 4 states, respectively, while the existing approach can only reach 16.45% and 23.55% under the same condition. © 2012 Springer-Verlag.

关键词： Electroencephalography

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Online vigilance analysis combining video and electrooculography features

Online vigilance analysis combining video and electrooculogr...

引用

19th International Conference on Neural Information Processing, ICONIP 2012

作者： Du, Ruo-Fei Liu, Ren-Jie Wu, Tian-Xiang Lu, Bao-Liang Center for Brain-like Computing and Machine Intelligence Department of Computer Science and Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China MOE-Microsoft Key Lab. for Intelligent Computing and Intelligent Systems Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China Shanghai Key Laboratory of Scalable Computing and Systems Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China MOE Key Laboratory of Systems Biomedicine Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 China

ISBN: (纸本)9783642344992

In this paper, we propose a novel system to analyze vigilance level combining both video and Electrooculography (EOG) features. For one thing, the video features extracted from an infrared camera include percentage of closure (PERCLOS) and eye blinks, slow eye movement (SEM), rapid eye movement (REM) are also extracted from EOG signals. For another, other features like yawn frequency, body posture and face orientation are extracted from the video by using Active Shape Model (ASM). The results of our experiments indicate that our approach outperforms the existing approaches based on either video or EOG merely. In addition, the prediction offered by our model is in close proximity to the actual error rate of the subject. We firmly believe that this method can be widely applied to prevent accidents like fatigued driving in the future. © 2012 Springer-Verlag.

关键词： Eye movements

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