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For mobile devices, battery energy is the most precious resource. In the last decade, researchers have proposed various energy saving strategies from the system level to the hardware component level. In this paper, we explore how close to one week a smart phone running off of a single battery can last under normal usage. We first developed a battery lifetime prediction model that considers the influence...
This paper studies the sequential decision under constraint conditions. This paper studies relation of status data, data quality to decision results, data worth and the rules of the designated solution. This paper uses simulation model, the Bayesian formula and the minimal expectations value principle, analyzes characteristics of data to decision results by changing the value of different model parameters...
Graphics processing units (GPUs) can deliver considerable performance gains over general purpose processors. However, GPU performance improvement vary considerably across applications. Porting applications to GPUs by rewriting code with GPU-specific languages requires significant effort. In consequence, it is desirable to predict which applications would benefit most before porting to the GPU. This...
Nowadays, stencil printing process has become one of the most crucial steps in the continuously developing reflow soldering technology. In this research, the process of stencil printing was modelled with Finite Volume Method. The geometrical model consists of the squeegee with attack angle of 60°, the stencil and the solder paste as the domain of interest. During the modelling, the flow field inside...
In order to prevent the financial risks of enterprises effectively, the risks evaluation is of great importance. This paper analyses the main factors that affect enterprise financial risks by using the T-test and nonparametric test in statistical software SPSS15.0 and the gray relevance theory (GRA). These factors are considered as the input variables of BP neural network and 56 enterprises are selected...
This paper presents the design, analysis and test of a novel planar 3-DOF (degree of freedom) precision positioning platform. Three two-level lever amplifiers are utilized to get a large amplification ratio. A more accurate flexible bending model of the lever amplifier is created to calculate the displacement loss relative to the PRBM (pseudo-rigid-body model). The displacement loss factor, the drift...
Accompanying increasing competition among the communication industry, maintaining and improving the stability and loyalty of customers has become the key determinant of profitability. In order to prevent the loss of customers, we need to identify the stable users by data mining model. Through the evaluation of three models, Random Forest model performs with better robustness. This model can describe...
The ionospheric total electron content (TEC) is an important ionospheric parameters, Research of it has important significance on communication, radar, spaceflight, GNSS and other domains. Traditional short-term forecast model of ionospheric TEC uses single model so as to affects the prediction precision. A combination model based on seasonal model and ARMA model was put forward to overcome the shortages...
Recently there has been much focus on Wireless sensor networks (WSN). However Location information is one of the most important information in WSN. Many location estimation algorithms for WSNs have been used to determine the sensor nodes position. In this paper, two different localization algorithms using Trilateration and Multilateration mathematical techniques have studied and compared according...
As integrated circuits become larger scale and more complex, more sophisticated simulation techniques are being developed for scalable analysis of variability, nonlinearity and sensitivity. This session presents three papers describing new simulation techniques with applications to a wide variety of circuits, including amplifiers, oscillators, PLLs and MEMS devices.
The growing concerns of energy efficiency and performance scalability motivate research in the area of many-core embedded systems. The software development of such systems plays an important role on the system performance, while accounting for a significant part of the total energy consumption. Thus, it becomes imperative to consider the software energy consumption at early stages of the software...
A new analytical model for the CMOS inverter is introduced. This model results by solving analytically the differential equation which describes the inverter operation. It uses new simplified transistor current expressions which are developed taking into account the nanoscale effects and also considering temperature as a parameter. Expressions for the output voltage are derived, which are then used...
Generators are the key equipment to determine the characteristics of power system dynamic behavior, the accuracy of generators' mathematical model and parameters will directly affect the results of power system dynamic simulation. Therefore, it is particularly important to assess the accuracy of generators' simulation model. In this paper, accuracy indices were proposed to evaluate the generator dynamic...
Recommender systems provide users with personalized suggestions about products or services. General task of recommender systems is to improve recommendation accuracy, but this paper mostly focuses on improving the degree of surprise, using SVD++ (singular value decomposition) model. First, logistic regression method is used to process raw data including different sorts of user actions on brands, such...
A bug in a software application may be a requirement bug, development bug, testing bug or security bug, etc. To prediet the bug numbers accurately is a challenging task. Advance knowledge about bug numbers will help the software managers to take decision on resource allocation and effort investments. The developers will be aware of the number of bugs in advance and can take effective steps to reduce...
The temperature dependencies of the basic parameters of MOSFETs in a temperature range 20 – 300 K are measured. The universal formal four-parametric model, which allows to approximate all experimental temperature dependencies with the relative error less than 1 % is proposed. The hybrid analytical model efficiency for approximation of volt-ampere characteristics of MOSFETs is proved.
Efficient and accurate network simulation techniques are critical for evaluating protocols and systems at scale. For example, the magnitude of modern data center deployments requires the use of fast simulation techniques in order to evaluate newly proposed algorithms and system architectures. Unfortunately, efficient simulation can come at the cost of accuracy and realism. In this work-in-progress...
In this study, we compared the effectiveness of two approaches to effort estimation for organizations utilizing SCRUM. We compared SCRUM's native effort estimation method Story Points and poker planning, with effort estimation models based on COSMIC Function Points (CFP) for a selection of projects. We utilized different regression models and ANN methodology to develop estimation model from the backlog...
In order to solve the problems of kinematics accuracy and reliability of parallel or series-parallel, a type of 3 parallel U 2 series mechanism was used for analysis. Posture and kinematics decoupling method is adopted and got the working space. Through the analysis of the kinematics characteristics of connecting rods and hooker, the sensitive parameters and model is determined. On basis of this,...
Photovoltaic (PV) technology permits us to harness and transform solar radiation into electricity. However, PV power generators are still a marginal share in the global power generation capacity. One of the main reasons for it is that PV systems are greatly dependent on the atmospheric conditions affecting their operation. Furthermore, series connection of PV cells is prone to power losses when the...
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