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991.
本文介绍了两种市场主流高端磁盘阵列的体系结构,阐述了软件对提高存储服务器性能的作用,比较了两种高端磁盘阵列,最后总结了高端磁盘阵列所采用技术并预测未来发展趋势. 相似文献
992.
Jun Wang Bormin Huang Jiaji Wu Jong‐Wha Chong 《Journal of the Society for Information Display》2011,19(8):551-560
Abstract— Overdrive is commonly used to reduce the liquid‐crystal response time and motion blur in liquid‐crystal displays (LCDs). However, overdrive requires a large frame memory in order to store the previous frame for reference. In this paper, a lapped transform‐based codec (LTC) is proposed to reduce the frame memory needed for LCD overdrive. In the latest literature, a directional prediction‐based codec (DPC) employs eight directional predictions, which takes up a large percentage of the computational complexity of the codec and does not consider the de‐correlation of the inter‐blocks. Therefore, the LTC first uses the lapped transform to decompose the correlation of the inter‐blocks in the YUV color space. A hadamard transform is then used for energy compaction. The reordered coefficients are pre‐quantized and encoded using the proposed adaptive bit‐plane coding (ABPC) method for a simple hardware implementation. The simulation results show that the proposed LTC significantly improves the DPC in both subjective and objective performance and outperforms the block truncation coding (BTC) and adaptive multi‐level BTC (AM‐BTC), which have been described in the literature. 相似文献
993.
A practical design of content protection for H.264/AVC compressed videos by selective encryption and fingerprinting 总被引:1,自引:0,他引:1
Digital Rights Management (DRM) of videos is an important issue nowadays. Considering that H.264/AVC videos will be widely used in various applications, we propose a practical design, which combines the methodologies of selective encryption and fingerprinting, for effective DRM of H.264/AVC streaming videos. A selective encryption scheme is first presented to scramble the video content by encrypting a small amount of data in the compressed bit-stream. The scrambled video is H.264-compliant to reduce the complexity of decoder since it can still be played without triggering errors in the decoding process. A fingerprinting scheme is then introduced to provide further protection. We extract a reasonable amount of data from the video and embed the watermark acting as the fingerprint of the video recipient. To acquire the high-quality video for viewing, the user has to decrypt the video obtained from a video server and then combine it with the watermarked data provided from a user information server. The resulting viewable video is thus fingerprinted to deter the user from illegally redistributing the content. Experimental results will demonstrate the feasibility of the proposed approach. 相似文献
994.
It is difficult to find the optimal sparse solution of a manifold learning based dimensionality reduction algorithm. The lasso
or the elastic net penalized manifold learning based dimensionality reduction is not directly a lasso penalized least square
problem and thus the least angle regression (LARS) (Efron et al., Ann Stat 32(2):407–499, 2004), one of the most popular algorithms
in sparse learning, cannot be applied. Therefore, most current approaches take indirect ways or have strict settings, which
can be inconvenient for applications. In this paper, we proposed the manifold elastic net or MEN for short. MEN incorporates
the merits of both the manifold learning based dimensionality reduction and the sparse learning based dimensionality reduction.
By using a series of equivalent transformations, we show MEN is equivalent to the lasso penalized least square problem and
thus LARS is adopted to obtain the optimal sparse solution of MEN. In particular, MEN has the following advantages for subsequent
classification: (1) the local geometry of samples is well preserved for low dimensional data representation, (2) both the
margin maximization and the classification error minimization are considered for sparse projection calculation, (3) the projection
matrix of MEN improves the parsimony in computation, (4) the elastic net penalty reduces the over-fitting problem, and (5)
the projection matrix of MEN can be interpreted psychologically and physiologically. Experimental evidence on face recognition
over various popular datasets suggests that MEN is superior to top level dimensionality reduction algorithms. 相似文献
995.
Enhanced opposition-based differential evolution for solving high-dimensional continuous optimization problems 总被引:1,自引:1,他引:0
Hui Wang Zhijian Wu Shahryar Rahnamayan 《Soft Computing - A Fusion of Foundations, Methodologies and Applications》2011,15(11):2127-2140
This paper presents a novel algorithm based on generalized opposition-based learning (GOBL) to improve the performance of
differential evolution (DE) to solve high-dimensional optimization problems efficiently. The proposed approach, namely GODE,
employs similar schemes of opposition-based DE (ODE) for opposition-based population initialization and generation jumping
with GOBL. Experiments are conducted to verify the performance of GODE on 19 high-dimensional problems with D = 50, 100, 200, 500, 1,000. The results confirm that GODE outperforms classical DE, real-coded CHC (crossgenerational elitist
selection, heterogeneous recombination, and cataclysmic mutation) and G-CMA-ES (restart covariant matrix evolutionary strategy)
on the majority of test problems. 相似文献
996.
Klara Nahrstedt Zhenyu Yang Wanmin Wu Ahsan Arefin Raoul Rivas 《Multimedia Tools and Applications》2011,51(2):593-623
In the recent past we have seen a boom of distributed interactive multimedia environments which use multiple correlated media
sensors, multi-view displays, and advanced haptic-audio-visual user interfaces for teleimmersive gaming, business meetings
and other collaborative activities. However, when we investigate the emerging teleimmersive environments closer, we realize
that their overall session management, including end-to-end session setup, establishment and run-time management are not appropriate
for the new demands that these environments present. These environments are cyber-physical rooms that demand (a) large scale of multi-sensory devices across geographically-distributed locations and (b) interaction with each other in synchronous and real-time manner. To deal with the new teleimmersive demands, we present a new session management design with (a) session initiation protocol(s) that understand media correlations, (b) view-based multi-stream topology establishment among multiple parties, (c) efficient, light-weight and distributed session monitoring with querying and debugging capabilities, (d) flexible view-based session adaptation with efficient topology adjustments, and (e) light-weighted and consistent session tear-down protocols. The presented design of the next generation session management protocols, services, algorithms and data structures is based
on our extensive experiences with building 3D teleimmersive interactive systems, experimenting with high impact teleimmersive
applications and deploying such environments at various venues. 相似文献
997.
Membership evaluation and feature selection for fuzzy support vector machine based on fuzzy rough sets 总被引:1,自引:1,他引:0
Qiang He Congxin Wu 《Soft Computing - A Fusion of Foundations, Methodologies and Applications》2011,15(6):1105-1114
A fuzzy support vector machine (FSVM) is an improvement in SVMs for dealing with data sets with outliers. In FSVM, a key step
is to compute the membership for every training sample. Existing approaches of computing the membership of a sample are motivated
by the existence of outliers in data sets and do not take account of the inconsistency between conditional attributes and
decision classes. However, this kind of inconsistency can affect membership for every sample and has been considered in fuzzy
rough set theory. In this paper, we develop a new method to compute membership for FSVMs by using a Gaussian kernel-based
fuzzy rough set. Furthermore, we employ a technique of attribute reduction using Gaussian kernel-based fuzzy rough sets to
perform feature selection for FSVMs. Based on these discussions we combine the FSVMs and fuzzy rough sets methods together.
The experimental results show that the proposed approaches are feasible and effective. 相似文献
998.
Research on the group decision-making about emergency event based on network technology 总被引:1,自引:1,他引:0
Kefan Xie Gang Chen Qian Wu Yang Liu Pan Wang 《Information Technology and Management》2011,12(2):137-147
In order to improve decision-making efficiency about emergency event, this paper proposes a novel concept, i.e., Agile-Delphi
Method, which is an integration of agile decision and Delphi Method implicating that the decision-makers instantly deliver,
respond, treat, and utilize information via Delphi process while conducting group decision-making about emergency event. The
paper details the mechanism of group decision-making about emergency event based on network technology and Agile-Delphi Method.
Finally, the paper conducts an empiric analysis taking the “111 event”, i.e., the liquid ammonia spill event happened on November
1, 2006 in a phosphorus chemical company in China, as an example. 相似文献
999.
Sun-Ju Shen Sheng-Hung Wu Jen-Hao Chi Chen-Chung Lin Jao-Jia Horng Chi-Min Shu 《Simulation Modelling Practice and Theory》2011,19(4):1251-1257
Dicumyl peroxide (DCPO), is produced by cumene hydroperoxide (CHP) process, is utilized as an initiator for polymerization, a prevailing source of free radicals, a hardener, and a linking agent. DCPO has caused several thermal explosion and runaway reaction accidents in reaction and storage zone in Taiwan because of its unstable reactive property. Differential scanning calorimetry (DSC) was used to determine thermokinetic parameters including 700 J g–1 of heat of decomposition (ΔHd), 110 °C of exothermic onset temperature (T0), 130 kJ mol–1 of activation energy (Ea), etc., and to analyze the runaway behavior of DCPO in a reaction and storage zone. To evaluate thermal explosion of DCPO with storage equipment, solid thermal explosion (STE) and liquid thermal explosion (LTE) of thermal safety software (TSS) were applied to simulate storage tank under various environmental temperatures (Te). Te exceeding the T0 of DCPO can be discovered as a liquid thermal explosion situation. DCPO was stored under room temperature without sunshine and was prohibited exceeding 67 °C of self-accelerating decomposition temperature (SADT) for a tank (radius = 1 m and height = 2 m). SADT of DCPO in a box (width, length and height = 1 m, respectively) was determined to be 60 °C. The TSS was employed to simulate the fundamental thermal explosion behavior in a large tank or a drum. Results from curve fitting demonstrated that, even at the earlier stage of the reaction in the experiments, ambient temperature could elicit exothermic reactions of DCPO. To curtail the extent of the risk, relevant hazard information is quite significant and must be provided in the manufacturing process. 相似文献
1000.
A method of transient adaptive sub-cells (TAS) suitable for unstructured grids that is modified from the existing one for the structured grids of DSMC is introduced. The TAS algorithm is implemented within the framework of a parallelized DSMC code (PDSC). Benchmarking tests are conducted for steady driven cavity flow, steady hypersonic flow over a two-dimensional cylinder, steady hypersonic flow over a cylinder/flare and the unsteady vortex shedding behind a two-dimensional cylinder. The use of TAS enables a reduction in the computational expense of the simulation since larger sampling cells and less simulation particles can be employed. Furthermore, the collision quality of the simulation is maintained or improved and the preservation of property gradients and vorticity at the scale of the sub-cells enables correct unsteady vortex shedding frequencies to be predicted. The use of TAS in a parallel-DSMC code allows simulations of unsteady processes at a level to be carried out efficiently, accurately and with acceptable computational time. 相似文献