Shanghai, China

Time filter

Source Type

Yang Z.,Shanghai Dianji University
2016 3rd International Conference on Systems and Informatics, ICSAI 2016 | Year: 2016

In this research, the ontology is used for the description of educational resources cloud services, and the description, integration, management and retrieval of cloud services of educational resources, both for achieving communication and interoperability between the cloud of educational resources, and providing an engineering reference and reuse for building for some specific educational resource cloud instance, but also for using the reasoning and matching techniques of ontology to find educational resource cloud services that most suitable for users' requirement, and them realize the discovery and selection of cloud services based on semantic, meet the users' 'subject to change' cloud services requirement at anytime, anywhere. Accordingly, this study not only has practical significance, but also has some theoretical value. © 2016 IEEE.

Zong Z.-X.,Shanghai Dianji University
2016 3rd International Conference on Systems and Informatics, ICSAI 2016 | Year: 2016

The numerical simulations of phonon transport in small scales are performed to different structures, the crystalline silicon nanofilm and the porous silicon media, which both belong to sub-continuum regions, using the lattice Boltzmann method (LBM). Transient temperature profiles across samples can be easily simulated utilizing the LBM program, providing a physical and intuitive understanding of the sub-continuum energy transport. Some small-scale thermal behaviors, such as ballistic transport, highly localized region accumulating thermal stress and non-uniform temperature gradient, are successfully captured in the framework of LBM. Consequently, the small-scale thermal property is quantified by extracting the effective thermal conductivity from simulated temperature gradient profiles. Results illustrate that reducing feature size into the sub-continuum domain will decrease the thermal conductivity when compared to its bulk value. © 2016 IEEE.

Luo Y.,Shanghai Dianji University
2016 3rd International Conference on Systems and Informatics, ICSAI 2016 | Year: 2016

We propose a class of almost rate-1 construction for 2n-bit hash functions, based on (2n, n) blockciphers, where 2n is the length of the cipher key and n is the cipher block length. These hash functions we proposed are proved to be optimum collision resistance and preimage resistance in the ideal cipher model. The hash rate of the construction is l-1/l where l is the number of cipher calls in the compression function. The hash rate is closed to 1 if l is large. Compare with existing DBL hash functions based on block ciphers with optimum collision resistance and preimage resistance, they are more efficient and simpler. © 2016 IEEE.

Liu T.,Shanghai Dianji University
2016 3rd International Conference on Systems and Informatics, ICSAI 2016 | Year: 2016

Because faults of gearbox are one of the most important factors of wind turbine, it is very important to research gearbox fault diagnosis technology. The problem of class unbalance is encountered in fault diagnosis of gearbox, which has a serious negative impact on the performance of the classifier of the hypothetical class. While it is critical that previous work rarely pays attention to the problem of gearbox fault diagnosis in this class imbalance. In the problem of imbalance, some features of dataset are superfluous, even irrelevant. These characteristics will affect the generalization performance of the learning machine. Here, it is propose AIEE (based on artificial immune algorithm function selection Easy Ensemble) to improve the gearbox fault diagnosis class imbalance problem. The experimental results of UCI datasets and gearbox fault data sets shows that AIEE algorithm can improve the classification performance and prediction accuracy of unbalanced datasets. © 2016 IEEE.

Yuan L.,Shanghai Dianji University
2016 3rd International Conference on Systems and Informatics, ICSAI 2016 | Year: 2016

In this paper, quaternary quantum Reed-Muller code construction with Gray map is investigated. Using the proposed approach, generated quaternary quantum code can be gained with short length of codeword. These quantum codes are simple for implementation and low-complexity in the encoding procedure. Therefore, it may be applied in a quantum computer for efficiently correcting quantum errors. © 2016 IEEE.

Peng X.,Shanghai Dianji University
2016 3rd International Conference on Systems and Informatics, ICSAI 2016 | Year: 2016

The identity of the vehicle is the only legal identification of the vehicle at the trusted center. It is directly related to the information of the vehicle user, and the anonymous authentication of the vehicle identity is an embodiment of the user privacy protection. Based on this, an on-board network anonymous authentication protocol is designed on the basis of certificateless signature scheme. The protocol does not require certificate management and there is no key escrow problem. The results show that the protocol authentication efficiency is significantly higher than that of the certificate-based authentication protocol and the identity-based authentication protocol, while satisfying the requirements of anonymity, non-repudiation, mutual authentication, conditional privacy protection and Anti-replay aggression. © 2016 IEEE.

Xia D.,Shanghai Dianji University
2016 3rd International Conference on Systems and Informatics, ICSAI 2016 | Year: 2016

In the open network environment, the strange entities can establish the mutual trust through Automated Trust Negotiation (ATN) that is based on exchanging digital credentials. However, the current negotiation takes it for granted that the process of negotiation is about two negotiations. In the open network environment there may be several one want to establish trust, so multi-party will negotiate. At this time the traditional two-party ATN is not enough, it is an important area, but is put less concern for the current research. This article pays attention on how to coordinate multi parties participate in automated trust negotiation. This article proposes a multi-party negotiation model, based which establish an algorithm and strategy, in order to make the negotiation process efficient. It can help to negotiation in multi-parties, and the negotiation process will be dependable. © 2016 IEEE.

Liu W.,Shanghai Dianji University
ICALIP 2012 - 2012 International Conference on Audio, Language and Image Processing, Proceedings | Year: 2012

The time delay estimation is an active research topic in the field of signal processing. Aiming on signals are on the low SNR conditions, a novel adaptive time delay estimation method is presented by using the fractional low order statistics. First, the signal noise ratio is improved via computing the fractional low order cross-covariation between two received signals and the fractional low order auto-covariation of a received signal. Second, they are put into two adaptive filters. The difference between peak locations of two filter weight efficiencies indicates the relative time delay between two received signals when they are convergent under least mean square criteria. Computer simulation studies show that the estimation performance of the proposed method is good, especially under heavier impulsive noise or lower signal noise ratio. © 2012 IEEE.

Xie Y.,Shanghai Dianji University
Applied Mechanics and Materials | Year: 2014

China has great potential in offshore wind energy and makes an ambitious target for offshore wind power development. Operation and Maintenance (O&M) of offshore wind turbines become more and more important for China wind industry. This study introduces the current offshore wind power projects in China. Donghai Bridge Offshore Demonstration Wind Farm (Donghai Bridge Project) is the first commercial offshore wind power project in China, which was connected to grid in June 2010. O&M of Donghai Bridge Project represent the state-of-the-art of China offshore O&M. During the past two and half years, O&M of Donghai Bridge Project has gone through three phases and stepped into a steady stage. It's believed that analysis of O&M of Donghai Bridge Project is very helpful for China's offshore wind power in the future. © (2014) Trans Tech Publications, Switzerland.

Zhang X.F.,Shanghai Dianji University
Advanced Materials Research | Year: 2014

Wind is one of the most promising sources of alternative energy. The construction of wind farms grows quickly in China. It is necessary for stakeholders to estimate investment costs and make good decisions on a wind power project by making a budget for the investment. However, the identification of rational investment practices is technically challenging because of the lack of scientific tools to evaluate optimal decisions. A multi-criteria evaluation method was proposed to select rational investment strategy for wind farm construction. The method is based on the analytic hierarchy process (AHP) together with a technique for order preference by similarity to ideal solution (TOPSIS). A decision problem hierarchy with three layers were investigated. The top layer is an objective layer for evaluating the investment rationality. The intermediate layer includes three evaluation criteria, that is, configuration of wind turbine generator systems, physical environment and social environment. Some relative and important indicators for each criterion are in the low layer. The evaluation results illustrate that the proposed method is practical and helpful to indentify the investment rationality for wind farms. © (2014) Trans Tech Publications, Switzerland.

Loading Shanghai Dianji University collaborators
Loading Shanghai Dianji University collaborators