Key Engineering Materials Vols. 439-440

Abstract: Information Resource Planning (IRP) is a comprehensive planning for the information that enterprise management activities needed which from the production, acquisition, to processing, storage, transmission and use and is the information construction foundation. Information Resource Standard Management Platform (STP) is based on the IRP standards and the model results and provides the tools of data element management and the platform of results demonstrated platform for IRP implementation.

Abstract: Cloud computing seems to offer some incredible benefits for communicators: the availability of an incredible array of software applications, access to lightning-quick processing power, unlimited storage, and the ability to easily share and process information. All of this is available through your browser any time you can access the Internet. While this might all appear enticing, there remain issues of reliability, portability, privacy, and security. When our private data are out-sourced in cloud computing, we should guarantee the confidentiality and searchability of the private data. Our paper provides a new approach to avoid the disclosure of the sensitive attributes of users when user ask for service from the Service Provider (SP) in cloud computing.

Abstract: Virtual-switch characteristics of noise-induced stochastic resonance using leaky integrate-and-fire (LIF) model was focused in this article. For LIF neuron model, Gaussian white noise was added to the simulating system. The condition of spike-starting was studied through the system. With the increase of noise intensity, the stimulated spikes became more and more intensive. With proper white noise intensity, the amount of excitatory spikes was enough to generate spike trains. We expected to design a virtual-switch utilizing this mechanism for neural data processing field.

Abstract: The demands of high-quality dynamic performance and short development time for vehicle production can only be fulfilled by the application of advanced design, simulation and optimization technologies. Virtual prototyping (VP), the analysis and simulation technology based on a fully developed computer model, represents a future way for cost and time efficient design of vehicles and can perform the same as those on the physical prototyping. This paper describes an integrated modeling method, based on the topological structure of a heavy vehicle and oriented to ride dynamics, of a human-vehicle-road system. A multi-body simulation model was chosen as the integration platform for the virtual prototyping since it provided the flexibility to integrate all relevant aspects such as rigid body movement, road-induced vibration and the driver’s responses to the vibration. The time domain model of the stochastic excitation from the road irregularities was numerically reconstructed as input data to VP and the feeling evaluation model in time domain, equivalent to conditional frequency evaluation, was used to the vehicle’s riding comfort simulation. Through integrating the sub-models in VP and combining the data of the sub-models it became possible to predict dynamic performance of vehicles by virtual prototyping technology.

Abstract: In contrast with Tableau algorithm, this paper presented a totally new approach to check the satisfiabilities of acyclic ALCNIR+-concepts―FTC algorithm. This calculus can make a direct judgment on the satisfiability of an acyclic ALCNIR+-concept by translating its description into a fully tiered clause whose satisfiability is directly available. FTC algorithm eliminates description overlaps to largest extent as it works on concept description directly. Therefore, FTC algorithm has notably better performance than Tableaux by saving a lot of spatial costs.

Abstract: This paper presents the fitting expressions of mean velocity profile and turbulence intensity for wind-snow coupling conditions. Different materials were adopted to simulate the roughness of saltation snow particles to get the distribution of wind velocity in the simple wind tunnel. Test results indicate that velocity profile obeys the logarithmic distribution; the turbulence intensity obeys power law distribution. The influence height of saltation snow particles to the velocity profile limited to 10 cm above from the bed surface.

Abstract: This paper presents the results of an outdoor investigation of wind-drifted snow distribution around a cube. The test was performed in a simple outdoor wind tunnel at Harbin in January 2009. Velocity distribution around the cube and pressure coefficient on the cube surfaces are also simulated with computational fluid dynamics (CFD). The simulation is based on homogenous two-phase flow theory, where the flow field is predicted by solving Navier-Stokes equations for transient, incompressible viscous flow. The inlet profiles of the simulation adopted data got from wind tunnel. Comparison between the test result and that of simulation shows that velocity is closely related to the snow distribution.

Abstract: In order to find a more effective method for the safety assessment of the bridge, a new mathematic, the clear mathematics was proposed. First, the basic knowledge of the clear mathematic was introduced. Second, the assessment model was set up. Finally, the model was employed to the assessment of a bridge. Engineering practice shows the efficiency and the rationality of the method. This study provides a new method for the safety assessment.

Abstract: In order to effectively utilize Web images to construct instructional resource database, a novel approach is proposed in this paper. With this approach, Web images and their semantics can be automatically downloaded, extracted and stored in resource database and the semantics can be refined by user feedback in retrieval progress. Image topic dictionary is built as the basis to extract semantics. Eight kinds of text are extracted as semantic source from Web pages. Based on image topic dictionary, image semantics can be extracted from the eight kinds of text. In order to further improve the accuracy of semantic extraction, we propose relevance feedback mechanism. Users can provide feedback to refine semantic annotation. The experimental results show that the approach is effective, in which high construction efficiency and quality can be achieved. The approach is better than manual annotation in efficiency and better than automatic annotation in accuracy. The similar methods can be applied to construct resource database of other forms of multimedia.

Abstract: Recently, Chen et al. proposed an efficient three-party encrypted key exchange protocol based upon Schnorr’s digital signature scheme with fewer rounds. However, J.H. Yang and C. C. Chang showed that Chen et al.’s protocol still has the high computation cost and communication cost. Moreover, Chen et al.’s protocol suffers from stolen-verifier attacks. Then J.H. Yang and C. C. Chang proposed a three-party authenticated key exchange protocol without password by using elliptic curve cryptography. Their improved protocol requires smaller transmitted message size and less communication times, which is well suitable for resource-limited environments such as mobile communication and mobile commerce. Unfortunately, we find that Yang et al.’s protocol is vulnerable to replay attacks, denial-of-Service attacks and impersonation attacks.