In this paper, we propose an automatic image based smoke detection using source separation. In particular, we assume that the region of interest(smoke region) is a linear combination of smoke and background pixels, an...In this paper, we propose an automatic image based smoke detection using source separation. In particular, we assume that the region of interest(smoke region) is a linear combination of smoke and background pixels, and we estimate the smoke component. More specifically, we extend the linear hyperspectral unmixing techniques to the context of image based smoke detection in order to separate the smoke component from the background. The proposed approach yields promising results especially with smoke images captured outdoor.展开更多
Recent advancements in wireless communication and microchip techniques have accelerated the development of wireless sensor networks (WSN). Key management in WSN is a critical and challenging problem because of the inn...Recent advancements in wireless communication and microchip techniques have accelerated the development of wireless sensor networks (WSN). Key management in WSN is a critical and challenging problem because of the inner characteristics of sensor networks: deployed in hostile environments, limited resource and ad hoc nature. This paper investigates the constraints and special requirements of key management in sensor network environment, and some basic evaluation metrics are introduced. The key pre-distribution scheme is thought as the most suitable solution for key management problem in wireless sensor networks. It can be classified into four classes: pure probabilistic key pre-distribution, polynomial-based, Blom's matrix-based, and deterministic key pre-distribution schemes. In each class of methods, the related research papers are discussed based on the basic evaluation metrics. Finally, the possible research directions in key management are discussed.展开更多
Synergic movement of finger's joints provides human hand tremendous dexterities,and the detection of kinematics parameters is critical to describe and evaluate the kinesiology functions of the fingers.The present ...Synergic movement of finger's joints provides human hand tremendous dexterities,and the detection of kinematics parameters is critical to describe and evaluate the kinesiology functions of the fingers.The present work is the attempt to investigate how the angular velocity and angular acceleration of the joints of index finger vary with respect to time during conducting a motor task.A high-speed video camera has been employed to visually record the movement of index finger,and miniaturized(5-mm diameter) reflective markers have affixed to the subject's index finger on the side close to thumb and dorsum of thumb at different joint landmarks.Captured images have been reviewed frame by frame to get the coordinate values of each joint,and the angular displacements,angular velocities and angular acceleration can be obtained with triangle function.The experiment results show that the methods here can detect the kinematics parameters of index finger joints during moving,and can be a valid route to study the motor function of index finger.展开更多
In order to design and provide good services,it is necessary for students to describe and understand the customer requirements for services rapidly,to design and plan the services and their behavior,and to schedule se...In order to design and provide good services,it is necessary for students to describe and understand the customer requirements for services rapidly,to design and plan the services and their behavior,and to schedule service processes effectively.This paper proposes a new service-oriented requirement elicitation and analysis method based on answer set semantic,sketches requirement Meta-model and correlative proofs and algorithms,which can help students represent requirement more declarative and precise.Based on the Meta-model,Subject-Predicate-Object requirement method and specification is presented,by which students can constitute a smooth,small-step,incremental and iterative development process cut in by forms.By applying this method to teach and help students develop service-oriented application,it is clear that it can help students eliminate the miscommunication between developers and users,assure the correctness of the artifacts and make the users active in development cycle.展开更多
The quality of groundwater resources needs to be assessed and monitored to ensure sustainable use and management.Groundwater-related data are characterized by inaccurate,missing values and significant uncertainties;wh...The quality of groundwater resources needs to be assessed and monitored to ensure sustainable use and management.Groundwater-related data are characterized by inaccurate,missing values and significant uncertainties;whose sources range from inadequacies and errors in the measuring techniques to insufficient sampling times and frequencies.Uncertainties展开更多
Based on the general formula of acid-base titration in analytical chemistry, an optimization model for evaluation of dissociation constants and concentrations of acids in mixed-acids is proposed in this paper. The mat...Based on the general formula of acid-base titration in analytical chemistry, an optimization model for evaluation of dissociation constants and concentrations of acids in mixed-acids is proposed in this paper. The mathematical properties of the optimization model are discussed, and then an algorithm for solving the problem is given, the convergence and the reliability of the algorithm are proved both by theoretical analysis and experimental examples.展开更多
文摘In this paper, we propose an automatic image based smoke detection using source separation. In particular, we assume that the region of interest(smoke region) is a linear combination of smoke and background pixels, and we estimate the smoke component. More specifically, we extend the linear hyperspectral unmixing techniques to the context of image based smoke detection in order to separate the smoke component from the background. The proposed approach yields promising results especially with smoke images captured outdoor.
文摘Recent advancements in wireless communication and microchip techniques have accelerated the development of wireless sensor networks (WSN). Key management in WSN is a critical and challenging problem because of the inner characteristics of sensor networks: deployed in hostile environments, limited resource and ad hoc nature. This paper investigates the constraints and special requirements of key management in sensor network environment, and some basic evaluation metrics are introduced. The key pre-distribution scheme is thought as the most suitable solution for key management problem in wireless sensor networks. It can be classified into four classes: pure probabilistic key pre-distribution, polynomial-based, Blom's matrix-based, and deterministic key pre-distribution schemes. In each class of methods, the related research papers are discussed based on the basic evaluation metrics. Finally, the possible research directions in key management are discussed.
基金Supported by the National Natural Science Foundation of China (30770546 )Natural Science Foundation of Chongqing(2006BB2043,2007BB5148)
文摘Synergic movement of finger's joints provides human hand tremendous dexterities,and the detection of kinematics parameters is critical to describe and evaluate the kinesiology functions of the fingers.The present work is the attempt to investigate how the angular velocity and angular acceleration of the joints of index finger vary with respect to time during conducting a motor task.A high-speed video camera has been employed to visually record the movement of index finger,and miniaturized(5-mm diameter) reflective markers have affixed to the subject's index finger on the side close to thumb and dorsum of thumb at different joint landmarks.Captured images have been reviewed frame by frame to get the coordinate values of each joint,and the angular displacements,angular velocities and angular acceleration can be obtained with triangle function.The experiment results show that the methods here can detect the kinematics parameters of index finger joints during moving,and can be a valid route to study the motor function of index finger.
文摘In order to design and provide good services,it is necessary for students to describe and understand the customer requirements for services rapidly,to design and plan the services and their behavior,and to schedule service processes effectively.This paper proposes a new service-oriented requirement elicitation and analysis method based on answer set semantic,sketches requirement Meta-model and correlative proofs and algorithms,which can help students represent requirement more declarative and precise.Based on the Meta-model,Subject-Predicate-Object requirement method and specification is presented,by which students can constitute a smooth,small-step,incremental and iterative development process cut in by forms.By applying this method to teach and help students develop service-oriented application,it is clear that it can help students eliminate the miscommunication between developers and users,assure the correctness of the artifacts and make the users active in development cycle.
文摘The quality of groundwater resources needs to be assessed and monitored to ensure sustainable use and management.Groundwater-related data are characterized by inaccurate,missing values and significant uncertainties;whose sources range from inadequacies and errors in the measuring techniques to insufficient sampling times and frequencies.Uncertainties
文摘Based on the general formula of acid-base titration in analytical chemistry, an optimization model for evaluation of dissociation constants and concentrations of acids in mixed-acids is proposed in this paper. The mathematical properties of the optimization model are discussed, and then an algorithm for solving the problem is given, the convergence and the reliability of the algorithm are proved both by theoretical analysis and experimental examples.
