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| 1 | 0.04 degree-per-hour MEMS disk resonator gyroscope with high-quality factor (510 k) and long decaying time constant(74.9 s)显示文摘The disk resonator gyroscope is an attractive candidate for high-performance MEMS gyroscopes.This gyroscope consists of a sensor and readout electronics,and the characteristics of the sensor directly determine the performance.For the sensor,a high-quality factor and long decaying time constant are the most important characteristics required to achieve high performance.We report a disk resonator gyroscope with a measured quality factor of 510 k and decaying time constant of 74.9 s,which is a record for MEMS silicon disk resonator gyroscopes,to the best of our knowledge.To improve the quality factor of the DRG,the quality factor improvement mechanism is first analyzed,and based on this mechanism two stiffness-mass decoupled methods,i.e.,spoke length distribution optimization and lumped mass configuration design,are proposed and demonstrated.A disk resonator gyroscope prototype is fabricated based on these design strategies,and the sensor itself shows an angle random walk as low as 0.001°/√h,demonstrating true potential to achieve navigation-grade performance.The gyroscope with readout electronics shows an angle random walk of 0.01°/√h and a bias instability of 0.04°/h at room temperature without compensation,revealing that the performance of the gyroscope is severely limited by the readout electronics,which should be further improved.We expect that the quality factor improvement methods can be used in the design of other MEMS gyroscopes and that the newly designed DRG can be further improved to achieve navigation-grade performances for high-end industrial,transportation,aerospace,and automotive applications. | Qingsong Li Dingbang Xiao Xin Zhou Yi Xu Ming Zhuo Zhanqiang Hou Kaixuan He Yongmeng Zhang Xuezhong Wu | 2018 | Microsystems & Nanoengineering2018，4，1： | 16 |
| 2 | Providing Location-Aware Location Privacy Protection for Mobile Location-Based Services显示文摘Location privacy has been a serious concern for mobile users who use location-based services provided by third-party providers via mobile networks. Recently, there have been tremendous efforts on developing new anonymity or obfuscation techniques to protect location privacy of mobile users. Though effective in certain scenarios, these existing techniques usually assume that a user has a constant privacy requirement along spatial and/or temporal dimensions, which may be not true in real-life scenarios. In this paper, we introduce a new location privacy problem: Location-aware Location Privacy Protection(L2P2) problem, where users can define dynamic and diverse privacy requirements for different locations. The goal of the L2P2 problem is to find the smallest cloaking area for each location request so that diverse privacy requirements over spatial and/or temporal dimensions are satisfied for each user. In this paper, we formalize two versions of the L2P2 problem, and propose several efficient heuristics to provide such location-aware location privacy protection for mobile users. Through extensive simulations over large synthetic and real-life datasets, we confirm the effectiveness and efficiency of the proposed L2P2 algorithms. | Yu Wang Dingbang Xu Fan Li | 2016 | Tsinghua Science and Technology2016，21，3： | 6 |
| 3 | Techniques and tools for analyzing intrusion alerts显示文摘 | Peng Ning Yun Cui Douglas S. Reeves Dingbang Xu | 2004 | ACM Transactions on Information and System Security (TISSEC)2004，，2： | 2 |
| 4 | Hypothesizing and reasoning about attacks missed by intrusion detection systems 显示文摘 | Peng Ning Xu Dingbang | 2004 | ACM Transactions on Information and System Security2004，7，4： | 1 |
| 5 | Building attack scenarios through integration of complementary alert correlation methods显示文摘 | Ning Peng Xu Dingbang Christopher G Healey | 2004 | 11th Annual Network and Distributed System Security Symposium(NDSS''04)2004，，： | 1 |
| 6 | Hypothesizing and Reasoning about Attacks Missed by Intrusion Detection Systems显示文摘 | Peng Ning Dingbang Xu | 2004 | ACM Transactions on Information and System Security(S1094-9224)2004，7，4： | 1 |
| 7 | Tech- niques and tools for analyzing intrusion alerts显示文摘 | Peng Ning Yun Cui Douglas S Reeves DingBang Xu | 2004 | ACM Trans- actions on Information and System Security2004，7，2： | 1 |
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