Xie Hong-wei

REVIEW ON DRIVER FATIGUE DETECTION TECHNOLOGY

Driver fatigue is widely regarded as a causal factor in many traffic accidents. Actually, fatigue is a complex psychophysiology phenomenon whose mechanism has not been explicitly explored. A variety of psychophysiology parameters have been used in previous researches as indicators of fatigue, among them, the electroencephalography (EEG) and electrooculography (EOG) may be the most promising ones. Many detection equipments are in use all over the world, although mainly in laboratories. Meanwhile, many methods have been tried in fatigue feature extraction and pattern recognition, such as nonlinear dynamical method, neural network, and so on. However, no standard agreement and procedure has been reached. This review looks over the state of the art in fatigue detection, with the aim to direct our future studies and the development of fatigue countermeasures.

Bayesian synthetic evaluation of multistage reliability growth with instant and delayed fix modes

Abstract In the multistage reliability growth tests with instant and delayed fix modes, the failure data can be assumed to follow Weibull processes with different parameters at different stages. For the Weibull process within a stage, by the proper selection of prior distribution form and the parameters, a concise posterior distribution form is obtained, thus simplifying the Bayesian analysis. In the multistage tests, the improvement factor is used to convert the posterior of one stage to the prior of the subsequent stage. The conversion criterion is carefully analyzed to determine the distribution parameters of the subsequent stages variable reasonably. Based on the mentioned results, a new synthetic Bayesian evaluation program and algorithm framework is put forward to evaluate the multistage reliability growth tests with instant and delayed fix modes. The example shows the effectiveness and flexibility of this method.

Controllable Subspaces of Open Quantum Dynamical Systems

This paper discusses the concept of controllable subspace for open quantum dynamical systems. It is constructively demonstrated that combining structural features of decoherence-free subspaces with the ability to perform open-loop coherent control on open quantum systems will allow decoherence-free subspaces to be controllable. This is in contrast to the observation that open quantum dynamical systems are not open-loop controllable. To a certain extent, this paper gives an alternative control theoretical interpretation on why decoherence-free subspaces can be useful for quantum computation.

Quantum Generalized Measurement and Deterministic Generation of Maximum Entangled Pure State

We propose the concept of the quantum generalized projector measurement (QGPM) for finite-dimensional quantum systems by studying the quantum generalized measurement. This research reveals a distinguished property of this quantum generalized measurement: no matter what the system state is prior to the measurement and what the result of the measurement occurs, the state of the system after the measurement can be collapsed into any specified pure state, i.e., the state of quantum system can be deterministically reduced to any specified pure state just by a single QGPM. Subsequently, QGPM can be used to deterministically generate the maximum entangled pure state for quantum systems. We give three concrete theoretic schemes of generating the maximum quantum entangled pure states for two 2-level particles, three 2-level particles and two 3-level particles, respectively.

Identification and analysis of cognitive errors during the process of man-machine interaction

System safety and performance could be degraded by human errors seriously. An approach for human error identification and description during the man-machine interaction process is presented. Firstly, a generic framework for identification and analysis of cognitive errors is designed, and a approach for classifying human errors is built. A general taxonomy of human errors is given in this approach. Secondly, various types of errors are searched guided by this taxonomy in each cognitive phase. The causes of these errors are analyzed within one general framework of performance shaping factors. Thirdly, the relationships among errors in two successive cognitive phases are discussed. Finally, a simple example is selected to illustrate the proposed approach.

AN APPROACH FOR HUMAN ERROR MODES AND EFFECTS ANALYSIS USING HTA+ETA

A framework for human error modes and effects analysis is presented. The methods of hierarchical task analysis and event tree analysis are introduced as the basic analytical tools, and a novel generic framework for human errors classification is presented as the guidance to identify human errors. Firstly, the process of human error modes and effects analysis is discussed, and the hierarchical task analysis method is introduced briefly. Secondly, the framework for human errors classification is discussed in detail. Thirdly, the multi-states event tree is designed to model the accident scenario. Finally, two scenarios are selected as the examples to illustrate the proposed process of human error modes and effects analysis.

Enhancing the capability of controlling quantum systems via ancillary systems

This paper explores the potential of controlling quantum systems by introducing ancillary systems and then performing unitary operation on the resulting composite systems. It generalizes the concept of pure state controllability for quantum systems and establishes the link between the operator controllability of the composite system and the generalized pure state controllability of its subsystem. It is constructively demonstrated that if a composite quantum system can be transferred between any pair of orthonormal pure vectors, then its subsystem is generalized pure-state controllable. Furthermore, the unitary operation and the coherent control can be concretely given to transfer the system from an initial state to the target state. Therefore, these properties may be potentially applied in quantum information, such as manipulating multiple quantum bits and creating entangled pure states. A concrete example has been given to illustrate that a maximally entangled pure state of a quantum system can be generated by introducing an ancillary system and performing open-loop coherent control on the resulting composite system.

The reasonability conditions for the identical thresholds assumption in IID parallel distributed detection networks

This paper proposed the reasonability conditions for identical thresholds assumption, which is widely adopted in the design of independent identical distributed (IID) detection networks. These conditions lay a theoretical foundation for the usually used design procedure.<<ETX>>