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CAPTCHA is a test that can, automatically, tell human and computer programmes apart. It is now almost a standard security technology, and has found widespread application on commercial websites. Robustness and usability are two fundamental aspects with CAPTCHA. The robustness of a text CAPTCHA is typically determined by the strength of its segmentation-resistance mechanism. The mechanism of Crowding...
This paper examines a proposal for firming wind turbine generation by using hydraulic storages associated with a chain of hydro generators on a river. This is the situation in the New Zealand power system where an increasing number of wind turbines could be combined with existing small storage hydro power stations on New Zealand rivers. This paper supposes that wind and small hydro are offered as...
Optimizing the use of copper especially in the distribution system not only reduces the cost but more importantly lowers the copper losses. This paper presents a unique innovative technique which reduces copper volume while enabling home automation. This model of smart home is designed to provide a base for Smart Grid's functions like demand side management, AMR, load shedding etc. The optimization...
With the development of Graphics Processing Unit (GPU) and the Compute Unified Device Architecture (CUDA) platform, researchers shift their attentions to general-purpose computing applications with GPU. In this paper, we present a novel parallel approach to run artificial fish swarm algorithm (AFSA) on GPU. Experiments are conducted by running AFSA both on GPU and CPU respectively to optimize four...
A great number of dimensionality reduction methods are finally reduced to solving generalized eigenvector problems. Optimization techniques are promising ways to solve the parameter selection problems in these dimensionality reduction methods. The most important step in these optimization methods is to compute the objective function with respect to the parameter, which depends on computing the gradient...
Scarcity of power is a common problem in developing countries like Bangladesh. The demand of fossil fuel as a conventional component for producing power, is not adequate. Merely, It is located in a region where prominent amount of solar irradiation and water flow can be accumulated for rendering power. In this paper, an integrated hybrid energy system has been discussed. This hybrid energy system...
This paper gives a new performance analysis method, which is through the Markov chain and queuing network model for Web server services thread and queue modeling, computing performance level coefficient, the different performance measurement data through the normalized integration, and presents an intuitive, quantitative results to match the best server configuration parameters. And on this basis...
A distributed optimization algorithm is presented for resource allocation in wireless relay networks. This algorithm is particularly useful in multiple-source, multiple-relay wireless networks employing fractional cooperation, in which each relay contributes only a fraction of its resources to each source; in this case, the algorithm is used to find the optimal fractions. The advantage of this distributed...
Progress in the maintenance area has been motivated by the increase in the number, size, complexity, and variety of equipment; growing awareness of the impact of equipment failures. Maintenance Method base on Risk Assessmen (MMRA) is one of the most popular maintenance optimization methods. Research presented in this paper is a pilot study using risk assessmen techniques in Preventive Maintenance...
This paper presents an improved algorithm for transmission expansion planning based on ant colony optimization, which is a heuristic optimization method showing several advantages compared to traditional methods. A grid model for the Nordic Area, Great Britain and a combination of both are used to show the performance of the optimization process. The focus of the work is to develop a tool for transmission...
This paper presents a new parameter optimization technique in order to parameter optimization of Linear Optimal Control (LOC) and Power System Stabilizer (PSS) in multi-machine power system. The optimized LOC consists of the advantages of conventional stabilizers. Also, the proposed LOC demonstrates excellent performance with fast response in multi-machine power systems. These features are developed...
The goal of image segmentation is to cluster pixels into salient image regions, it is the most significant step in image analysis. Thresholding is a simple but effective tool to separate objects from the background, which is one of the most popular algorithms. The artificial bee colony algorithm (ABC) is a recently presented meta-heuristic algorithm, which has been successfully applied to solve many...
This paper presents considerations of using wireless sensor networks for monitoring conditions within wind farms, taking into considerations the specific of such applications. In these scenarios, which are intended to cover a lot of ground or even operate in difficult radio environments with strong attenuation, the simple and direct communication between source and destination is not always possible,...
An optimized iterative algorithm for generalized phase-shifting interferometry is proposed. Using 1/4 plate as phase-shifter, we derive the phase distribution with the initial phase shift of π/2, then a more accurate phase shift can be obtained with the obtained phase distribution. The whole iteration includes the above two steps. The exact phase shift is near π/2, so fewer iterative steps are needed...
Single-polarization single-mode (SPSM) micro structured polymer optical fiber (MPOF) is designed based on polymethyl methacrylate (PMMA) . A full vector finite element method together with beam propagation method are adopted to study the properties of SPSM. By optimization designing, we found that only one polarization state of the fundamental mode can be transmitted within the visible light region...
While there has been many studies on the efficient design of p-cycles focusing on optimizing their spare capacity efficiency, few of them consider such a design under the wavelength continuity assumption, i.e., no wavelength converter at any node. Consequently, few authors look at the routing and wavelength assignment in the context of p-cycles, where p-cycles have to be assigned the same wavelength...
Internet of things (IoT) has been researched in recently years. The Savant as a midware provides the data collecting and pre-processing for the IoT applications. Data grid can aggregate the resources in the IoT. Using data grid to build the Savant enables the Savant manage large scale data and optimizes the efficiency of the resources in IoT. In this paper, the data in the IoT is classified, and a...
Energy consumption in wireless communication system is rapidly increasing due to the growth in wireless multimedia access. Combating the adverse effects of excessive energy consumption demands for energy-aware system design called green communication, which has become the major focus of many researchers recently. In this paper, we propose user selection and power allocation schemes for a multi-user...
In this paper, we formulate an optimization problem for resource allocation and scheduling in orthogonal frequency division multiple access (OFDMA) half-duplex decode-and-forward (DF) relay assisted networks. Our problem formulation takes into account artificial noise generation to combat a multiple antenna eavesdropper. The secrecy data rate, power, and sub-carrier allocation policies are optimized...
For the back-reflection pump way, the short pulse generated from homogeneously broadened Yb3+:YAG crystal in an active CW-injected ring cavity is studied numerically. In the derived model, the pump absorption saturation and the fluorescence concentration quenching are both taken into account, and it enables the optimizations of Yb3+:YAG crystal length and Yb3+ concentration.
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