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A hybrid efficient short-term traffic flow forecast technology

A hybrid efficient short-term traffic flow forecast technolo...

引用

6th International Conference on Fuzzy systems and Knowledge Discovery, FSKD 2009

作者： Lin, Xin Wang, Xiaoye Xiao, Yingyuan Zhang, Degan Tianjin Key Lab. of Intelligent Computing and Novel Software Technology Tianjin University of Technology Tianjin 300191 China Key Laboratory of Computer Vision and System Ministry of Education Tianjin University of Technology Tianjin 300191 China

ISBN: (纸本)9780769537351

This paper presents a hybrid short-term traffic flow forecast technology. For the uncertainty, the short-term traffic flow forecast is complicated, and the accuracy is not high. This strategy combines the RBF neural network and ant colony clustering algorithm to forecast the traffic flow. It used ant colony clustering algorithm to get the centers of hidden layer neurons. To find the best clustering result, local search is used in ant colony algorithm. The model has strong local generalization abilities and high accuracy. The simulation experiment results illuminate that the application is fairly effective. © 2009 IEEE.

关键词： Forecasting

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Research on multi-dimensional association rules mining in distributed environments based on advanced SQL query

Research on multi-dimensional association rules mining in di...

引用

6th International Conference on Fuzzy systems and Knowledge Discovery, FSKD 2009

作者： Zhang, Lei Qiao, Mei Zhang, Degan Tianjin Key Lab. of Intelligent Computing and Novel Software Technology Tianjin University of Technology Tianjin 300191 China Key Laboratory of Computer Vision and System Ministry of Education Tianjin University of Technology Tianjin 300191 China

ISBN: (纸本)9780769537351

This paper proposes the MDMA (Multi-dimensional Distributed Mining Association rules) algorithm based on advanced SQL query. The algorithm works on star-style structure networks. It uses CUBE operator in new standard SQL and combines with SQL powerful query function. So there is no need for the proposed algorithm to conduct a great deal of iterations to generate frequent itemsets in the process of mining association rules. Therefore, no matter what the number of the site in the distributed environments and the scale of the local database in the local site is, the algorithm always needs only two times of scanning the database and only three times of network communications to generate all the global frequent itemsets. Consequently, this algorithm has the merits of light network traffic, low time cost, better scalability and more simplicity. © 2009 IEEE.

关键词： Association rules

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A novel two-step-deformation active contour with application to facial features extraction

A novel two-step-deformation active contour with application...

引用

2009 2nd International Congress on Image and Signal Processing, CISP'09

作者： Hua, Zhang Yuanquan, Wang Tianjin Key Lab. of Intelligent Computing and Novel Software Technology Tianjin University of Technology Tianjin 300191 China Key Laboratory of Computer Vision and System Ministry of Education Tianjin University of Technology Tianjin 300191 China

ISBN: (纸本)9781424441310

In allusion to the boundary leaking problem of traditional active contours when used to extract facial features, two kinds of local information are introduced to enhance the weak boundary, then to build new external force for active contours. The prior knowledge of the local shape of the facial features is incorporated into the evolution of active contour. The snake contour in each evolution step just serves as prediction, and then is ruled by the prior local shape;this way, the snake contour deforms via prediction-correction two steps. This two-step-deformation (TSD) snake can utilize the a priori shape of objects effectively. The proposed strategies are evaluated on several images and the experimental results validate the high performance of this TSD snake for facial features segmentation. ©2009 IEEE.

关键词： Deformation

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A low-complexity synchronization based cache coherence solution for many cores

A low-complexity synchronization based cache coherence solut...

引用

IEEE 9th International Conference on Computer and Information technology, CIT 2009

作者： Lin, Wei Fan, DongRui Huang, He Yuan, Nan Ye, Xiaochun Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing China Graduate University of Chinese Academy of Sciences Beijing China

ISBN: (纸本)9780769538365

Computer architectures make a dramatic turn away from improving single-processor performance towards improved parallel performance through integrating many cores in one chip. However, providing directory based coherence protocols for these platforms is too complex and expensive. As a substitute, we propose a synchronization based cache coherence solution, which uses different cache policies according to three flexible software guided scopes (exclusion, producer and consumer scopes) to solve the data-race and coherence problem. Furthermore, this protocol implements word dirty bits (only one bit per word is needed in each L1 cache line) and a special hardware synchronization manager (HSM) to support multi-writer, the write-validate policy and to eliminate the remote un-cache spinning at the "flag". We evaluate Godson-T, a platform supporting this protocol, against an idealized interleaved dual tag directory based protocol on the Splash2 and two bioinformatics benchmarks. The performance of the synch-based protocol is degraded only at 3.2% on average, but the real chip area is reduced at 32% even if the overhead of HSM is included. © 2009 IEEE.

关键词： Synchronization

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A scalable scan architecture for Godson-3 multicore microprocessor

A scalable scan architecture for Godson-3 multicore micropro...

引用

18th Asian Test Symposium, ATS 2009

作者： Qi, Zichu Liu, Hui Li, Xiangku Wang, Da Han, Yinhe Li, Huawei Hu, Weiwu Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences China Graduate University of Chinese Academy of Sciences GUCAS Beijing China

ISBN: (纸本)9780769538648

This paper describes the scan test challenges and techniques used in the Godson-3 microprocessor, which is a scalable multicore processor based on the SMOC (Scalable Mesh of Crossbar) on-chip network and targets high-end applications. Advanced techniques are adopted to achieve the scalable, low-power and low-cost scan architecture at the challenge of limited I/O resources and large scale of transistors. To achieve a scalable and flexible test access, a highly elaborate TAM (Test Access Mechanism) is implemented with supporting multiple test instructions and test modes. Taking advantage of multiple cores embedding in the processor, scan partitions are employed to reduce test power and test time, and test compression with more than 10X compression ratio are utilized to decrease the scan chain length. To further decrease test time, a Data-Synchronous-Comparator (DSC) is proposed for comparing the scan responses of the identical cores. © 2009 IEEE.

关键词： Comparators (optical)

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M-IVC: Using multiple input vectors to minimize aging-induced delay

M-IVC: Using multiple input vectors to minimize aging-induce...

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18th Asian Test Symposium, ATS 2009

作者： Jin, Song Han, Yinhe Zhang, Lei Li, Huawei Li, Xiaowei Yan, Guihai Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing China Chinese Academy of Sciences Graduate University Beijing China

ISBN: (纸本)9780769538648

Negative bias temperature instability (NBTI) has been a significant reliability concern in current digital circuit design due to its effect of increasing the path delay with time and in turn degrading the circuit performance. NBTI degradation has strong dependence on input pattern and duty cycles. Based on this observation, we propose to apply multiple input vectors to the combination circuit in a non-uniform way during standby mode. Multiple input vectors can enhance the capability to control the circuit nodes, achieve smaller duty cycles to reduce the stress time of gates and thus mitigate static NBTI. A constrained multi-object optimization model is formalized to find the optimal combination of duty cycles for timing-critical paths, which in turn minimizes the increase of path delay. An ATPG-like procedure is then presented to generate the corresponding input vectors. Experimental results demonstrate that the delay increase of timing-critical paths can be mitigated significantly under long time NBTI effect (10-year) by only applying a small number of vectors. © 2009 IEEE.

关键词： Negative bias temperature instability

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Design of new hash mapping functions

Design of new hash mapping functions

引用

IEEE 9th International Conference on Computer and Information technology, CIT 2009

作者： Song, Fenglong Liu, Zhiyong Fan, Dongrui Zhang, Junchao Yu, Lei Yuan, Nan Lin, Wei Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing China Graduate University of Chinese Academy of Sciences Beijing China

ISBN: (纸本)9780769538365

Conflict can decrease performance of computer severely, such as bank conflicts reduce bandwidth of interleave multibank memory systems and conflict misses reduce effective on-chip capacity, and this incurs much conflict miss further. Conflicts can be avoided by a suitable address mapping scheme which maps the most frequently occurring patterns conflictfree. In this paper, we present a new XOR-based mapping scheme, called XORM, which focuses on multi-bank shared cache of on-chip many-core architecture. The XORM mapping scheme can map arbitrary bits of address to set indices and compute each set index bit as XOR of a transpositional subset of the bits in the address. Then, we analyze necessary characteristics of an address mapping scheme to avoid conflict in many-core architecture. Next, we give a case study to design optimal hash functions based on XORM scheme for skewedassociative cache. Finally, we introduce another case study, in which we illustrate how to design an XORM mapping scheme with lower implementation cost, complexity and computing latency in shared cache of chipped many-core architecture. The evaluated results show the effectiveness of XORM mapping scheme. © 2009 IEEE.

关键词： Hash functions

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A low overhead on-chip path delay measurement circuit

A low overhead on-chip path delay measurement circuit

引用

18th Asian Test Symposium, ATS 2009

作者： Pei, Songwei Li, Huawei Li, Xiaowei Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences China Academy of Sciences Graduate University of Chinese Beijing 100190 China

ISBN: (纸本)9780769538648

In this paper, we present a novel on-chip path delay measurement circuit for efficiently detecting and debugging of delay faults in the fabricated integrated circuits. Several delay stages are employed in the proposed circuit, whose delay ranges are increased by a factor of two gradually from the last to the first delay stage. Thus, the proposed method can achieve a large delay measurement range with a small quantity of delay stages. Experimental results show that a significant reduction in both delay measurement time and area overhead can be obtained compared to the previous Vernier Delay Line based delay measurement schemes. In addition, by conducting delay compensation, the proposed method can achieve both improved delay measurement resolution and measurement accuracy. © 2009 IEEE.

关键词： Timing circuits

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Multi-tiered on-demand resource scheduling for VM-based data center 09

Multi-tiered on-demand resource scheduling for VM-based data...

引用

2009 9th IEEE/ACM International Symposium on Cluster computing and the Grid, CCGRID 2009

作者： Song, Ying Wang, Hui Yaqiong, Li Feng, Binquan Sun, Yuzhong Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing China Graduate University Chinese Academy of Sciences Beijing China

ISBN: (纸本)9780769536224

The trend of using virtualization for server consolidation is more and more popular in enterprise data center. However, ondemand resource allocation among the concurrent hosted services in such a virtualized environment is still a challenge. In order to optimize resource allocation among services in data center, this paper proposes a multi-tiered resource scheduling scheme which automatically provides on-demand capacities to the hosted services via resources flowing among VMs. We model the resource flowing using optimization theory. Based on this model, we present a global resource flowing algorithm in the multi-tiered resource scheduling scheme. This algorithm preferentially ensures performance of some critical services by degrading of others to some extent when resource competition arises. Using our RAINBOW prototype, we evaluate the multitiered resource scheduling scheme with the performance improvements for the most critical services up to 9%˜16%, which are 75% of the maximum improvement margin, while performance degradation of others is up to 2%, and leads to 1%˜5% improvements in resource utilization than RAINBOW without resource flowing. Compared with the existent scheme, our work leads to 9% less improvements for critical services, while introduces 39% less degradation to low priority services. © 2009 IEEE.

关键词： Resource allocation

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On structural properties of large-scale software systems: From the perspective of complex networks

On structural properties of large-scale software systems: Fr...

引用

6th International Conference on Fuzzy systems and Knowledge Discovery, FSKD 2009

作者： Sun, Shiwen Xia, Chengyi Chen, Zhenhai Sun, Junqing Wang, Li Tianjin Key Laboratory of Intelligence Computing and Novel Software Technology Tianjin University of Technology Tianjin 300191 China PLA Troop 66366 Hebei 064100 China Key Laboratory of Computer Vision and System Ministry of Education Tianjin University of Technology Tianjin 300191 China

ISBN: (纸本)9780769537351

From the viewpoint of network, large-scale computer software systems can be regarded as complex networks composed of interacting units at different levels of granularity (such as functions, classes, packages, source files, etc.). In this paper, the collaboration relationships between header files in the source node of Linux kernels, which are representative examples of large-scale open-source software systems, are analyzed by constructing weighted network-Header File Collaboration Network (HFCN). Through using appropriate non-weighted and weighted quantities, the complex structural properties, the weight distribution and the impact between them of these networks are characterized and analyzed. These results can provide a better description of the organizational principles at the basis of the architecture of source codes in large computer software systems. © 2009 IEEE.

关键词： Complex networks

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