Cloud Storage Technology and Its Applications

Cloud storage employs software that interconnects and facilitates collaboration between different types of storage devices Compared with traditional storage methods, cloud storage poses new challenges in data security, reliability, and management. This paper introduces four layers of cloud storage architecture： data storage layer （connecting multiple storage components）, data management layer （providing common support technology for multiple services）, data service layer （sustaining multiple storage applications）, and user access layer. A typical cloud storage application--Backup Cloud （B-Cloud）--is examined and its software architecture, characteristics, and main research areas are discussed.

Energy optimal routing for long chain-type wireless sensor networks in underground mines

无线传感器网络是到存在在地下的矿监视系统的有用补充。他们起监视系统的安全提高和改善范围和灵活性的一个重要作用。对在在地下的矿的灾难以后的危险和环境敏感的区域要求节点的节省并且平衡的精力消费延长网络的 lifespan。基于一条隧道的结构，我们在场一个长链类型无线传感器网络(LC-WSN ) 掘监视地下的矿的安全。我们定义最佳的传播距离和关键区域和礼品的范围为 LC-WSN 到的一个精力最佳的路由(EOR ) 算法平衡节点的精力消费并且最大化网络的 lifespan。EOR 基于最佳的传播距离构造路由路径并且使用在关键区域平衡策略的一个精力。模拟结果证明 EOR 算法扩大一个网络的 lifespan，在关键区域平衡节点的精力消费并且有效地限制路由路径的长度，与类似的算法相比。

Prime Factorization in the Duality Computer

我们把算法给 factorize 在两重性计算机的大整数。Weprovide 为因式分解的三个两重性算法基于一个天真的因式分解方法，在量计算的 Shoralgorithm，和 Fermat “在古典计算的 s 方法。所有这些算法可以是在输入尺寸的多项式。

A New Design and Implementation of an Attendance Checking Node for Coal Mines

A novel design and implementation of an attendance checking node for coal mines based on the CAN bus is presented in this paper. Hardware circuits and programming methods for the attendance checking node are discussed,including the single-chip computer with CAN controller AT89C51CC03,the CAN bus transceiver TJA1050,the large capacity DataFlash memory,the real-time clock DS1302,the voice chip ISD2560 and the card-reading circuit in Wie-gand format. All the extended hardware satisfies the requirements for intrinsically safe circuits (GB3836.4-2000) and intrinsically safe authentication promoted by the national explosion-proof institute. Further,the software programming methods for the CAN controller (AT89C51CC03) and the implementation of the CAN communications protocol are presented as well.

Mine-hoist fault-condition detection based on the wavelet packet transform and kernel PCA

A new algorithm was developed to correctly identify fault conditions and accurately monitor fault development in a mine hoist. The new method is based on the Wavelet Packet Transform (WPT) and kernel PCA (Kernel Principal Compo- nent Analysis, KPCA). For non-linear monitoring systems the key to fault detection is the extracting of main features. The wavelet packet transform is a novel technique of signal processing that possesses excellent characteristics of time-frequency localization. It is suitable for analysing time-varying or transient signals. KPCA maps the original input features into a higher dimension feature space through a non-linear mapping. The principal components are then found in the higher dimen- sion feature space. The KPCA transformation was applied to extracting the main nonlinear features from experimental fault feature data after wavelet packet transformation. The results show that the proposed method affords credible fault detection and identification.

FFT-DMAC: a tone based DMAC protocol

This paper presents the flip-flop tone(FFT)DMAC protocol,a tone based MAC protocol using di-rectional antennas to solve the deafness problem,hidden terminal and exposed terminal problems simulta-neously.It uses two pairs of flip-flop tones .The first pair of tone is to send omni-directionally to reachevery neighboring node to announce the start and the end of communication,and therefore to alleviate thedeafness problem.The second pair of tone is to send directionally towards the sender.It is used to solvethe hidden terminal problem as well as the exposed terminal problem.Evaluation shows that FFT-DMACcan achieve better performance compared to the 802 .11 and ToneDMAC protocol.

ROUTING AND WAVELENGTH ASSIGNMENT ALGORITHMS BASED ON EQUIVALENT NETWORKS

In this paper, a Wavelength Division Multiplexing (WDM) network model based on the equivalent networks is described, and wavelength-dependent equivalent arc, equivalent networks, equivalent multicast tree and some other terms are presented. Based on this model and relevant Routing and Wavelength Assign- ment (RWA) strategy, a unicast RWA algorithm and a multicast RWA algorithm are presented. The wave- length-dependent equivalent arc expresses the schedule of local RWA and the equivalent network expresses the whole topology of WDM optical networks, so the two algorithms are of the flexibility in RWA and the optimi- zation of the whole problem. The theoretic analysis and simulation results show the two algorithms are of the stronger capability and the lower complexity than the other existing algorithms for RWA problem, and the complexity of the two algorithms are only related to the scale of the equivalent networks. Finally, we prove the two algorithms’ feasibility and the one-by-one corresponding relation between the equivalent multicast tree and original multicast tree, and point out the superiorities and drawbacks of the two algorithms respectively.

Concept Lattice Construction through the Composition and Decomposition of Formal Contexts

The purpose of this paper is to study the construction of concept lattice from variable formal contexts.Composition and decomposition theories are proposed for the unraveling of concept lattice from contexts with variable attribute set in the process of information updating.The relationship between the extension sets of the original context and that of its sub-context is analyzed.The composition and decomposition theories are then generalized to the situation involving more than two sub-contexts and the situation with variable attribute set and object set.