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Commercial piezoelectric actuated stages usually has been decoupling designed from the mechanical structure. This paper develops a piezoelectric actuated stage (P-563.3CD) experiment platform. Observed cross-coupling effect in the piezo-stage is below 1%. In order to improve the performance of piezo-stage in a further step, a multi-channel Hammerstein model is developed to describe the cross-coupling...
The purpose of this work is to explore the possibility of using (Multi-disciplinary Design and Optimization) MDO frameworks for complex system design of space experiment. Considering both launch and space environmental requirements, the multi-objective optimization of a novel nested flying vehicle for space science experiments is carried out by decreasing launch weight, frequency response, vacuum...
The accelerated growth of applications and services in intelligent transportation systems (ITS) are driven by interests from the public and private sectors. The intent to utilize the onboard resources, along with the advanced methods of managing the available computing capabilities in the conventional cloud, has led to the high popularity of Vehicular Clouds. Likewise in Vehicular Networks, vehicles...
In practice, the Unscented Kalman Filter based on the scaled unscented transformation is usually used as a default form with a set of constant scaling parameters. Sometimes this form cannot obtain the ideal performance and is lack of robustness, especially when it is applied to some highly nonlinear models. This paper, therefore, proposes a new method by modifying the main scaling parameter at every...
Meteorological stations often have biased distributions in remote areas, and sample biases typically lead to biased estimation of areal precipitation. We introduce a method termed the Biased Sentinel Hospital based Area Disease Estimation (B-SHADE) to correct for the bias in the locations of meteorological observations and to obtain a best linear unbiased estimation of the mean areal precipitation...
This paper proposes a model-based software safety analysis method for flight control software. Firstly, the AADL architecture model and error model of flight control software are constructed separately. Then we convert the AADL model of flight control software into extended Markov chain model. We can evaluate safety of software component by calculate the probability of component state in different...
In service-oriented mobile social networks (S-MSN), many location-based services are developed to provide various applications to social participants. Services can in turn be composed with the help of these participants. However, the composite structure, the subjective interpretation of trust demand, and the opportunistic connectivity make service composition a challenging task in S-MSN. In this paper,...
This paper proposes an optimization model of multi-inventory matching and order planning of the iron-steel factories based on the mixed strategy of MTO-MTS. The model considers the multiple objectives, i.e., the total cost of earliness/tardiness penalty, tardiness penalty in delivery time window, production penalty; inventory matching, order cancellation penalty and machine capacity penalty. An improved...
Time constrained service composition raises several problems. Researches on QoS-driven service composition provide some preliminary solutions, but there are still some unsolved issues, which can be attributed to the following reasons: (1) the huge time consumption of inter-domain validation, (2) the dynamic execution time of services and (3) the difficulty in defining time constraint due to the opaque...
The trajectory tracking problem for the 6-degree-of-freedom (DOF) parallel robot is analyzed in this paper, which is a typical multi-input multi-output (MIMO) systems control issue. A novel high-efficiency model-based control scheme is proposed based on the off-line multi-body dynamics of the parallel robot, which extensively enhances the on-line computation efficiency. Moreover, the velocity signals...
Danger Theory is a method of biological immunology. It presents an effective method to reduce false positive and improve the efficiency of AIS. Cloud model is an effective tool to transform qualitative concepts into quantitative expressions for uncertain problems. Change is potential causes of system imbalance, and is the basis and sample for danger analysis. This paper uses the concept of Cloud model...
The producing mechanism for danger signals is the most important in the danger theory used in AIS. To determine whether a system is "dangerous" needs more considerations. This paper uses the cloud model to describe the changes of system continuous parameters. For discontinuous change parameters, we use the changes of each parameter as a separate danger signal. The continuous and discontinuous...
This paper studied the problems of parameter system construction for large-scale Internet of Thing situation assessment. It also states the research of situational awareness and assessment of IP network briefly, the situation assessment differences between Internet of Thing and IP network are dicussed, for some especial aspects and the significance about large-scale Internet of Thing situation assessment...
Benefiting from the virtualization technology, virtual cluster system possesses a lot of advantages different from traditional cluster system. However, the availability analysis of virtual cluster system is still short of efficient methods. The availability analysis of virtual cluster node is the base of analyzing the availability of virtual cluster system. In this paper, we summarize a typical architecture...
We prove that the forward looking Nash equilibrium (FLNE) from the angle of dynamic strategic bidding is the subset of locally envy-free equilibrium. For limiting vindictive bidding in GSP and "sawtooth" bidding in GFP, we introduce a new pricing strategy and analyse its equilibrium and properties.
Trust in Peer to Peer network has the fuzzy feature, and thus it cannot be described and handled using distinct mathematic model. To solve the problem, based on the advantage of using intuitionistic fuzzy theory to handle vague information, we propose a novel P2P trust model named IFTM (Intuitionistic Fuzzy theory based Trust Model), which uses membership, nonmembership and hesitancy degree to describe...
It's clear and easy to use client/server model to describe the topology of a simple system. But things will be changed when we try to define and describe nodes' relationship between each other using the same model. We proposed a new model named Bus Connection Management Model to improve solution of that problem. This model is consulted real bus network and well fitted to manage the topology of multiple...
As software programs become increasingly large and complex, it is more important to improve the quality of software maintenance. Many software programs rely on bug reports to correct errors in maintenance activities. Bug tracking systems were developed to guide maintenance activities of software developers. However, due to the excessive number of duplicate bug reports, developers spend much time to...
Flow turbulence intensity is one of the most important indexes in measuring the shear performance of vertical impinging stream reactor (VCISR). The staggered forms of the upper and lower blades and the distances among draft-tube are the significant factors affecting the turbulence intensity in the reactor. In order to explore the law that the structure parameters impact the internal flow field, a...
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