Results 161 to 170 of about 44,010 (201)

A Novel Phase-Locked Loop under Grid Fault Condition

2019 4th IEEE Workshop on the Electronic Grid (eGRID), 2019
Tracking the frequency and phase information of the power grid quickly and accurately when the power grid has unbalanced, distorted grid voltage and fluctuant frequency is very important for power system control and protection and power electronics converter application. However, the traditional phase locked loop will lose its effect in this case.
Rong Xu, Hang Yin, Tian Lan, Xiang Wu, Yuanliang Lan   +4 more
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Fault-tolerant gait generation for locked joint failures

SMC'03 Conference Proceedings. 2003 IEEE International Conference on Systems, Man and Cybernetics. Conference Theme - System Security and Assurance (Cat. No.03CH37483), 2004
This paper addresses the issue of tolerating a locked joint failure in gait planning for hexapod robots which have symmetric structures and legs in the form of an articulated arm with three revolute joints. A locked joint failure is one for which a joint cannot move and is locked in place. If a failed joint is locked, the workspace of the resulting leg
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An all digital phase locked loop fault tolerant clock

1991 IEEE International Symposium on Circuits and Systems (ISCAS), 1991
An implementation of a fault-tolerant clock is presented. The clock is quad redundant, designed according to a structured methodology that is tolerant to faults in any one of its four channels. This was achieved through the use of an all-digital phase-locked-loop (ADPLL) design that maintains synchronization to within 90 degrees between all nonfaulty ...
D.J. Van Alen, A.K. Somani
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Lock-in Amplifier Applications for Fault Isolation

International Symposium for Testing and Failure Analysis
Abstract This paper describes how lock-in amplifiers and boxcar averaging can overcome limitations in conventional fault isolation techniques for microelectronic testing. Our approach achieves superior results compared to traditional spectrum analyzer methods through three key applications.
Sukho Lee, Kristofor Dickson
openaire   +1 more source

Truly Stripping Functionality for Logic Locking: A Fault-Based Perspective

IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems, 2020
Logic locking is a holistic solution to counter manufacturing threats, such as intellectual property (IP) piracy and overbuilding at the hardware level. However, years of research has exposed various flaws in locking, including a Boolean satisfiability (SAT)-based attack. Consequently, several SAT-resilient locking techniques, such as SARLock, Anti-SAT,
Abhrajit Sengupta, Mohammed Nabeel, Nimisha Limaye, Mohammed Ashraf, Ozgur Sinanoglu   +4 more
openaire   +1 more source

Point defects and lock-in faults in columnar phases

Liquid Crystals, 1990
Abstract We show the existence of point defects connected by strings in columnar phases. The most interesting consequence is the increase, by several orders of magnitudes, of the bend elastic modulus as compared to values for nematics.
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Recovery characteristics of flux-lock type superconducting fault current limiter

Physica C: Superconductivity and its Applications, 2007
Abstract The flux-lock type superconducting fault current limiter (SFCL) has attractive characteristics that the current limiting level can be adjusted by a winding direction and the inductance ratio between two coils. We changed the winding direction and the number of coils to compare the resistive type SFCL with the flux-lock type SFCL. The initial
T.H. Han, H.S. Choi, S.H. Lim, N.Y. Lee
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Fault tolerant gaits of legged robots for locked joint failures

SMC 2000 Conference Proceedings. 2000 IEEE International Conference on Systems, Man and Cybernetics. 'Cybernetics Evolving to Systems, Humans, Organizations, and their Complex Interactions' (Cat. No.00CH37166), 2002
In this paper, fault detection and tolerance in static walking of legged robots are addressed. A kind of fault events, locked joint failure, is defined and its properties are investigated in the frame of gait study and robot kinematics. For the purpose of tolerating a locked joint failure, an algorithm of fault tolerant gaits for a quadruped robot is ...
J.-M. Yang, D.-I. Ko, K.-H. Shim, S.-K. Hwang   +3 more
openaire   +1 more source

An FDI approach for aircraft actuator lock-in-place fault

2007 IEEE International Conference on Control and Automation, 2007
In this paper, an adaptive observer approach is developed to detect and isolate aircraft actuator faults. Particularly, the fault of actuator locked in place is considered. In a multiple-model scheme, a bank of parallel observers are constructed, each of which is based on a model that describes the system in the presence of a particular actuator fault.
null Dan Wang, null Jialiang Huang, null Ge Guo, null Shuanghe Yu   +3 more
openaire   +1 more source

Petri nets and mobile agent composed fault unit lock scheme

2008 Third International Conference on Electric Utility Deregulation and Restructuring and Power Technologies, 2008
When the power system happened with the protection information lost or the incorrect operation, at present it still depends on the backup protection to isolate the fault with prolonged time and the extended tripped area. In this paper use the Petri nets as the synthetically analysis on the protection information tool and the mobile agent the ...
null Xia Lin, null Yuping Lu, null Yuhuan Liu   +2 more
openaire   +1 more source