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The paper considers a reference-based control system for heaving wave energy converters. The proposed controller comprises two parts: lower level part (LLP) and higher level part (HLP). The HPL generates the buoy's velocity reference with the objective to maximize the power absorption with the constraints in the maximum control force and the power take-off device's utilization index. The index is...
Context-Aware Recommendation Systems has gained lots of attention in both industry and academic research. Factorization Machines (FM) based recommendation has been successfully used in sparse industrial datasets for user personalized video recommendations. FM is a collaborative filtering technique for predicting a target such as user rating, given observations of interaction between some users and...
Matrix Factorization (MF) is a very popular method for recommendation systems. It assumes that the underneath rating matrix is low-rank. However, this assumption can be too restrictive to capture complex relationships and interactions among users and items. Recently, Local LOw-Rank Matrix Approximation (LLORMA) has been shown to be very successful in addressing this issue. It just assumes the rating...
Smart city or urban wisdom is the new goal of urban development. In view of how to develop the wisdom city better, this paper analyzes the present situation of wisdom city development in China, and uses the entropy weight method to construct a new intelligent city evaluation system with reference to the existing wisdom city evaluation scheme. According to the data of Beijing, Tianjin and Shanghai,...
It is found that the GARCH (1,1) model has a good fitting effect on the time series by the statistical analysis of the logarithmic yield of the closing price of the Shanghai Composite Index. Therefore, this paper first uses the model GARCH (1,1) predicts the daily closing price of the Shanghai Composite Index, and then uses the Fourier series to correct the predicted residuals to obtain the final...
When analyzing competition in telecommunication markets it is fundamental to take into account their specific characteristics. Moreover, it is important to understand the temporal evolution of competition as a result of multiple contextual factors. For these reasons the present study analyzes competition in mobile telecommunications, measured through the Lerner Index, and explains its evolution through...
Modern companies can't operate and conduct business without using a developed and stable functioning information system, which includes a network. To monitor network performance characteristics of network traffic are often defined, the values of them determine the performance of the network. Mostly these characteristics values vary slightly within predetermined time intervals. A significant change...
In the future, the limit of power transmission handling capability of power systems will be violated due to the pursuit of economic benefit and increase penetration of renewable energy resources. Hence, the likelihood of voltage instability and system's risk of experiencing voltage collapse has increased. The voltage stability analysis remains a major concern in the operation of modern power systems...
This paper proposes an approach to estimate the ratio between shorted and total turns in interior permanent magnet synchronous machines (IPMSM). When an inter-turn short circuit (ISC) occurs, a particular disturbance affects the motor. The proposed method estimates this disturbance using an observer; this estimated signal is used to obtain the short circuit ratio. The observers are based on a dynamic...
In order to scientifically and effectively allocate university education resources and improve the efficiency of educational resources, we need to evaluate the efficiency of university education. Delphi, AHP and DEA organically combine to establish a combination of university efficiency evaluation model. The model can not only reflect the preferences of decision makers, but also objectively evaluate...
Significant increases in computational resources have enabled the development of more complex and spatially better resolved weather and climate models. As a result the amount of output generated by data assimilation systems and by weather and climate simulations is rapidly increasing e.g. due to higher spatial resolution, more realisations and higher frequency data. However, while compute performance...
Aimed at abnormal score from evaluation experts, real data from Shanghai double-blind sampling system of graduate dissertation and thesis between 2013 and 2014 have been in depth analysis and mining. Some basic judgment rules of abnormal score are summed up, and monitoring model for abnormal score is proposed. By the least squares method and the multiple regression models, the equation of monitoring...
This paper proposes an approach to construct effectiveness evaluation model semi-automatically based on system architecture such as Department of Defense Architecture Framework (DoDAF). The effectiveness evaluation index system is firstly generated based on architecture models including Capability Dependencies (CV-4), Capability to Operational Activities Mapping (CV-6), Operational Activity to Systems...
As a key component of DC medium voltage breaker, the switch mechanism is required to open in high-speed and can withstand the breaking voltage which is generated during opening motion. Thus, the design of driving circuit of switch mechanism is very important to optimize the mechanism structure and improve mechanism opening characteristics. First the motion principle of high-speed switch was given...
Recently, fault indicators with communication function have been increasingly used in fault diagnosis of distribution networks. In this paper, an objective function which considers the reliability index of the distribution network and economic factors synthetically has been proposed for optimal placement of fault indicators in distribution networks, and binary particle swarm optimization algorithm...
In this work, we are interested by emulating metamaterial microwave waveguides which behave like conventional metallic ones. We use metamaterial layers based on two types of unit cells. The first one is a connected cross type unit cell which leads to a metamaterial with a near zero refraction index (n1 ≈ 0). The second one is a disconnected cross type unit cell which leads to a metamaterial with a...
For the deficiency of the incidence model, the incidence model based on the included angle of vectors is presented and is extended to the panel data. In order to describe the incidence between the sequences, which is projected to n-dimensional vector. The included angle of vectors reacts the difference of the sequences in similarity. The incidence model based on the included angle of vectors is defined,...
The analytical evaluation of the Pocklington's integro-differential equation for thin wires has been solved by the Method of Moments in many different versions. However, the least square procedure proposed here is a variant that uses only real algebra and is slightly more complex and computer intensive as opposed to using the Method of the Moments. Good convergence for the current is obtained and...
In this paper, possibility and accuracy of using reduced I-V data in PV parameter identification are discussed. Based on the linear identification method proposed in [1], six I-V points are used instead of the whole I-V curve to identify the PV parameters. The maximum power point (MPP) is then estimated using the identified I-V and P-V characteristics. Validation is done by using different sets of...
Orthogonal frequency division multiplexing with index modulation (OFDM-IM), which uses the subcarrier indices as a source of information, has attracted considerable interest recently. When the index modulation (IM) technique is applied to filter bank multicarrier (FBMC) system, the intrinsic interferences are partly eliminated but the remaining interferences still affect the bit error rate (BER) performance...
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