In order to avoid internal attacks during data aggregation in wireless sensor networks, a grid-based network architecture fit for monitoring is designed and the algorithms for network division, initialization and grid...In order to avoid internal attacks during data aggregation in wireless sensor networks, a grid-based network architecture fit for monitoring is designed and the algorithms for network division, initialization and grid tree construction are presented. The characteristics of on-off attacks are first studied and monitoring mechanisms are then designed for sensor nodes. A Fast Detection and Slow Recovery (FDSR) algorithm is proposed to prevent on-off attacks by observing the behaviors of the nodes and computing reputations. A recovery mechanism is designed to isolate malicious nodes by identifying the new roles of nodes and updating the grid tree. In the experiments, some situations of on-off attacks are simulated and the results are compared with other approaches. The experimental results indicate that our approach can detect malicious nodes effectively and guarantee secure data aggregation with acceptable energy consumption.展开更多
In CH HCSB TBM（China Helium-Cooled Solider Breeder Test Blanket Module）, the structural material （Eurofer）, the neutron multiplier （Be）, the breeder material（Li4SiO4）, and the coolant（He） are used in the des...In CH HCSB TBM（China Helium-Cooled Solider Breeder Test Blanket Module）, the structural material （Eurofer）, the neutron multiplier （Be）, the breeder material（Li4SiO4）, and the coolant（He） are used in the design. The parameter selections of materials are very important to the safety design. This paper will provide some parameters of materials property（such as specific heat, thermal conductivity） through calculation.展开更多
This paper describes the design and implementation of a coal mine safety management information system based on Ajax. The whole system includes two alarm processing subsystem and management subsystem. Alarm processing...This paper describes the design and implementation of a coal mine safety management information system based on Ajax. The whole system includes two alarm processing subsystem and management subsystem. Alarm processing subsystem in the server, used to analyzed monitoring data of underground mine, judged whether it is in an abnormal state, also including the crews time recorded by RFID, so that timely alarm data is written to the database for the use of management infonlaation system; management information system adopts the three layer system structure based on B/S, the client the use of ax technology for an asynchronous request to the server, the server operation backstagc Oracle database to complete the business logic processing, and the results in XML form and return it to the client, the subsystem to the user to provide an interactive platform, users can monitor the underground state in real time, at the same time when the abnormal status, the system can timely alarm, prevent the occurrence of coal mine accidents.展开更多
Data link communication requires data communication process must have reliability, availability, confidentiality, availability, integrity, non-repudiation, controllability.This has a great effect to ensure the normal ...Data link communication requires data communication process must have reliability, availability, confidentiality, availability, integrity, non-repudiation, controllability.This has a great effect to ensure the normal communication functions.In this paper the author on the basis of many years of work experience, first discussed the establishment of a risk assessment system data link,then focused on the problem of index weight assessment.To data communication security, this research article will provide some references.展开更多
Nowadays, more and more digitalized spatial data are sold and transmitted on the Internet. Thus, there arises an important issue about copyright protection of the digital data. To solve this problem, this paper has de...Nowadays, more and more digitalized spatial data are sold and transmitted on the Internet. Thus, there arises an important issue about copyright protection of the digital data. To solve this problem, this paper has designed and implemented a spatial data watermarking service (SDWS) system which can provide a secure framework for data transaction and transfer via the Internet and protect the rights of both copyright owners and consumers at the same time.展开更多
基金This work was supported by the National Natural Science Foundation of China under Grant No. 60873199.
文摘In order to avoid internal attacks during data aggregation in wireless sensor networks, a grid-based network architecture fit for monitoring is designed and the algorithms for network division, initialization and grid tree construction are presented. The characteristics of on-off attacks are first studied and monitoring mechanisms are then designed for sensor nodes. A Fast Detection and Slow Recovery (FDSR) algorithm is proposed to prevent on-off attacks by observing the behaviors of the nodes and computing reputations. A recovery mechanism is designed to isolate malicious nodes by identifying the new roles of nodes and updating the grid tree. In the experiments, some situations of on-off attacks are simulated and the results are compared with other approaches. The experimental results indicate that our approach can detect malicious nodes effectively and guarantee secure data aggregation with acceptable energy consumption.
文摘In CH HCSB TBM（China Helium-Cooled Solider Breeder Test Blanket Module）, the structural material （Eurofer）, the neutron multiplier （Be）, the breeder material（Li4SiO4）, and the coolant（He） are used in the design. The parameter selections of materials are very important to the safety design. This paper will provide some parameters of materials property（such as specific heat, thermal conductivity） through calculation.
文摘This paper describes the design and implementation of a coal mine safety management information system based on Ajax. The whole system includes two alarm processing subsystem and management subsystem. Alarm processing subsystem in the server, used to analyzed monitoring data of underground mine, judged whether it is in an abnormal state, also including the crews time recorded by RFID, so that timely alarm data is written to the database for the use of management infonlaation system; management information system adopts the three layer system structure based on B/S, the client the use of ax technology for an asynchronous request to the server, the server operation backstagc Oracle database to complete the business logic processing, and the results in XML form and return it to the client, the subsystem to the user to provide an interactive platform, users can monitor the underground state in real time, at the same time when the abnormal status, the system can timely alarm, prevent the occurrence of coal mine accidents.
文摘Data link communication requires data communication process must have reliability, availability, confidentiality, availability, integrity, non-repudiation, controllability.This has a great effect to ensure the normal communication functions.In this paper the author on the basis of many years of work experience, first discussed the establishment of a risk assessment system data link,then focused on the problem of index weight assessment.To data communication security, this research article will provide some references.
基金Supported by the National High Technology Research and Development Program of China(No.2006AA12Z210)
文摘Nowadays, more and more digitalized spatial data are sold and transmitted on the Internet. Thus, there arises an important issue about copyright protection of the digital data. To solve this problem, this paper has designed and implemented a spatial data watermarking service (SDWS) system which can provide a secure framework for data transaction and transfer via the Internet and protect the rights of both copyright owners and consumers at the same time.
