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Knowledge outcome improvement is critical to the success of e-communities. We build on attitude-based theory and trust literature to propose a model that explains the relationship between belief, knowledge exchange, and knowledge outcomes. This model is based on the trust-centered lens, and theorizes knowledge exchange as affected by one's constructed support, in terms of individual virtual skill...
A low-cost but high-accuracy mechanism for detecting falls is critical for many health and safety applications, including caring for the elderly. Existing approaches are unduly expensive and sensitive to user physique and biometrics. Additionally, most approaches were developed using limited, simulated fall data and often perform poorly in field tests. To resolve these issues, in this paper we propose...
A low-cost but high-accuracy mechanism for detecting falls is critical for many health and safety applications, including caring for the elderly. Existing approaches are unduly expensive and sensitive to user physique and biometrics. Additionally, most approaches were developed using limited, simulated fall data and often perform poorly in field tests. To resolve these issues, in this paper we propose...
Nowadays, to achieve better performance, some "smart device" needs an ultra accurate analog signal source to trim/calibrate its internal circuit during mass production which is very challenging for current ATE vendors. To design such a highly accurate signal source, it requires lots of engineering time especially in system architecture optimization, system noise estimation and performance...
The cascade H-bridge topology is novel for the battery energy storage system (BESS). A multi-level battery management system (BMS), which contains three subsystems, is introduced. The functions and communication of each subsystem are discussed. An algorithm based on extended Kaiman filter is used for the state-of-charge (SOC) estimation in battery modules. The pack SOC is derived from those of the...
Extended Kalman filter (EKF) is a typical method for state-of-charge (SOC) estimation of lithium batteries. An equivalent circuit model for the lithium battery is established, and model parameters are identified by experimental methods. Based on the battery model and model parameters, an EKF is proposed for SOC estimation. Analysis is conducted on the effect of the model coefficients of EKF to the...
Inconsistency is common in lithium-ion battery packs and it results in voltage differences. Data from a battery pack with 200 cells connected in serial in a battery energy storage system (BESS) are applied for study. According to the causes of the voltage difference, three cell inconsistencies can be categorized as state-of-charge (SOC), internal resistance and capacity. The divergences among the...
The polarization effect is an significant and complex phenomenon of the lithium iron phosphate battery. An electrical method is applied in analysis of the effect. Based on a equivalent circuit model, a modified hybrid pulse power characterization (HPPC) test is used for identification of ohmic resistance and polarization resistance, which are two parameters reflecting the polarization degree. The...
Battery energy balancing is crucial in large scale battery energy storage applications. By power electronic circuits, energy transfers from one battery to another with little loss. This paper introduces a DC/AC inverter for battery modules balancing. The DC port is connected to positive and negative electrodes of a battery module and the AC port is connected to that of another inverter. Therefore,...
Internal resistance is an important element for lithium-ion batteries in battery management system (BMS) for battery energy storage system (BESS). The internal resistance consists of ohmic resistance and polarization resistance. Neither of them can be measured directly and they are identified by some algorithms with battery charging/discharging experiment data. In this paper, several 10Ah LiFePO4...
An algorithm is proposed about a dual channel and double audio digital watermarking based on the lifting wavelet transform (LWT) in this paper. First, a dual channel audio is selected, the left and right channel is extracted, and the left and right channel is decomposed on LWT3. The difference of the left and right channel is selected as the first watermarking on LWT3 in the low frequency. An image...
Technological selection encompasses not only rich technological contents, but also rich economic contents. The model is not a pure technological concept, nor is a pure economic concept. The research proposes transfer control model. What sets this research apart from previous studies is the proposition that not all enterprises that contribute financial resources to the technological transfer can become...
Parameter self-setting fuzzy PID control algorithm for control drying temperature is applied to improve the problem about big fluctuations in temperature and high pellet broken rate of traditional control on Cold pressure ball drying system, and the controller create a intelligence temperature control system through combine fuzzy control and PID control. We can know that the control system has advantages...
Aimed at the bearing outer ring of planetary gear in planetary transmission, the failure mechanism of wear between the planet gear bearing and thrust washer was investigated. The reasons for its failure and ways to reduce wear were also studied. A typical wear failure of bearing outer ring was analyzed in terms of the morphology observation with scanning electron microscopy (SEM), the metallographic...
Aimed at washer in planetary transmission, the wear problem of thrust washer and planet gear due to the force in axis direction was investigated. In order to reduce wear, hydrodynamic lubrication design was studied by way of machining rectangular groove in radial direction into one side of thrust washer. The purpose of hydrodynamic lubrication design is that the relative movement between planet gear...
Discrete element method is a numerical methods using for non-continuous media, which is suitable for high rock slope stability analysis with developed rock fault, joints and cracks. Strength reduction is a numerical methods, widely using in the slope stability analysis, it maintained that the strength reserve coefficient and the stable safety factor proposed by the limit equilibrium is equivalent...
The planetary gear assembly is a key sub-mechanical set of the Power Shift-Steering Transmission Device (PSSTD). With the help of vibration measurement, the diagnosis issue of the needle bearing failure in the planetary gear assembly is solved. For what, there are collision pulses appearing when the Elastohydro Dynamic Lubrication (EHDL) oil film break in the needle bearing, which can be monitored...
Based on the tracked vehicle hydrostatic transmission which combines a variable displacement piston pump and a fixed displacement piston motor, the paper present a study on hydraulic braking capacity of the hydrostatic transmission and the study show that it is affected by fluid viscosity, system pressure, pump speed, pump displacement, engine braking torque, hydraulic torque efficiency and volumetric...
Nowadays, MPSoCs or multicore processors have been becoming the major trend of system or processor designs. Thus the design of interconnection networks becomes the most important issue of all. However, lots of different problems may arise in the network design and they should be carefully handled. It is widely known that most of these problems can be resolved easily by asynchronous circuits. But because...
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