The correlation between wind speed and failure rate (FR) of turbines is analyzed with time series approach. power index (PI) FR are established based on historical data, which pretreated by singularity processing, stationarity wavelet de-noising. trend variations the from both domain frequency extracting indicator functions, including auto-correlation function, cross-correlation spectral density function. A case study given out to verify validity model method, data January 1995 December 2002...

Lung cancer is the with highest morbidity and mortality at home abroad present. Using computed tomography (CT) to screen lung nodules a huge workload. To test effect of artificial intelligence in automatic identification by using find automatically chest CT 1 mm 5 thick.5,000 cases T1 stage patients layer thickness were respectively labeled learned computer neural network, algorithm forming pulmonary was carried out. 500 tested formation, sensitivity specificity compared reading.Using read...

Background: Moxifloxacin (MXF) possesses anti-inflammatory properties on asthmatic airway smooth muscle cells (ASMCs) beyond their antimicrobial effects, but the mechanisms are still unknown. This study was to investigate effects of MXF expression caveolin-1 (Cav-1) and flotillin-1 (FLOT1) in ASMCs rats. Methods: were collected from cultured vitro. Cells normal rats treated with saline (Group N); incubated A) or (20 mg/L) M); Cav-1 up-regulated by transferring expressing lentivirus L) FLOT1...

During the control process of three-phase PWM rectifier, parameters conventional PID controller are kept constant. It's unable to make appropriate changes according actual working condition rectifier and change environment, which limits adaptability environment conditions. Against this point, single neuron adaptive is used as voltage outer loop instead PID. The could online adjustment state rectifier. As a result, it solves phenomenon that performance varies with different Through...

Purpose The purpose of this paper is to propose a new tool for stock investment risk management through studying stocks with what kind characteristics can be predicted by individual investor behavior. Design/methodology/approach Based on comment data from the Snowball, thermal optimal path method employed analyze lead–lag relationship between attention (IA) and price. And machine learning algorithms, including SVM BP neural network, are used predict prices certain stock. Findings It turns...

This paper proposes a new wavelet based image denoising method by using linear elementary parameterized functions in the form of derivatives Gaussian set estimated coefficients. These coefficients are derived from an improved context modeling procedure terms mean square error estimation combining inter- and intra-sub band data. The results two-step effort which outperforms state-of-the-art non-redundant methods. is also extended to over complete expansion applying cycle spinning, provides...

Abstract Purpose: To test the accuracy of most widely used technique based on edge detection for thickness measurement hip joint cartilage in MR images, and to improve by developing a new method model MRI process. Materials Methods: was performed 3 normal cadaver hips, 25 hips volunteers, patients with osteoarthritis. In general, defined as distance between two sides along directions surfaces. this article is referred “edge method.” A theoretical simulation analysis revealed that...

The purpose of this study is to develop a three-dimensional registration method for monitoring knee joint disease from magnetic resonance (MR) image data sets. A global optimization technique was used identifying anatomically corresponding points femur surfaces (bone cartilage interfaces). In first pre-registration step, we the principal axes transformation correct different positions and orientations in MR scanner. second presented search algorithm based on Lipschitz theory. This can...

In the new energy power generation, software phase locked loop is an important part of grid connected converter. unbalanced and harmonic system, accuracy speed traditional unable to meet needs high performance converter at same time. The frequency conversion PLL based on filter amplitude compensation precisely extracts fundamental positive sequence component. has been significantly improved although suffers unbalance, distortion, or mutation. method can completely out interference signal...

Three-phase rectifier topology is given first, on this basis, analyzing the differences of seven-segment SVPWM modulation method and five-segment method, show two kinds duty ratio calculation formula in different sectors. And then consider influence DC-bus voltage, temperature IGBT junction loss IGBT, giving methods conduction loss, switching total about diode, deriving power device using thermal resistance equivalent circuit calculate three-phase through formulas result under compare to...

To investigate the effect of polypropylene fibers on mechanical properties concrete structures in cold regions, obtain an appropriate amount fiber content, and improve frost resistance structure, freeze-thaw cycle tests were conducted three groups reinforced short column specimens with different contents. The depth surface damage specimen was detected using ultrasonic method. stress process failure analyzed through axial compression test, corresponding changes compressive toughness...

The purpose of this study is to develop a new method for the registration 3D cartilage plates in MR data set. This technique traces local thickness changes over time. In first rough step, principal axes transformation (PAX) and landmark methods are used. second an improved iterative closest point (ICP) sets from segmentation MRI sequences registratered these processes. experimental results demonstrate effectiveness knee time based on bone interfaces.

Most of exist humanoid legs have 6 degrees freedom (DOF). This paper proposes a new leg mechanism with 7 DOFs, and three DOFs in the hip, one DOF knee ankle. And hip joints, called double spherical joint is adopted, which has six those axes intersect point. for joints waist function without increasing an actuator. there are (DOF) ankle; therefore it possible robot to perform multiple postures even if positions trunk fixed

Automatic X-ray inspection of industrial parts usually uses reference-based methods, in which a set model images or statistics extracted from the image are selected as benchmark. Based on these many systems developed and used extensively for anomaly detection. However, performance relies heavily set. Thus, selection is very important. This paper presents an approach automatically selecting to be assisted defect recognition (ADR) system detection turbine blades jet engines. The proposed...

Changes of the cartilage morphology over time can tell progression osteoarthritis (OA) and show particular promise for evaluating efficacy disease-modifying OA drugs. Hence, matching is required prior to comparison. An accurate allows one ensure longitudinal focal local changes due OA. The method described in this article meets need. proposed consists three steps. First, knee femur surfaces are aligned, using principal axes transformation correct different joint positions orientations...

Stock market research based on network behavior data has become one of the focuses in behavioral finance. In this paper, we firstly construct a proxy variable investors' attention comments collected from Snowball Finance, which is popular online financial community China. Then analyze lead-lag relationship between and stock price all A-shares listed both Shanghai Exchange Shenzhen Exchange, using Thermal Optimal Path (TOP) method. And find that have dynamic relationship, differs to stock....

We describe a technique for the registration of three dimensional (3D) knee femur surface points from MR image data sets; it is that can track local cartilage thickness changes over time. In first coarse step, we use direction vectors volume given by cloud to correct different joint positions and orientations in scanner. second fine propose global search algorithm simultaneously determines optimal transformation parameters point correspondences through searching six space Euclidean motion...

In the hip joint, femoral and acetabular cartilages are in proximity to each other, a conventional measurement technique based on edge detection, can introduce large underestimation errors of cartilage thickness. this study, we develop model-based approach for accurate thickness measurement. We model imaging process two adjacent sheet structures, which simulate articular joint. This be used predict shape intensity profile along normal orientation. Using an optimization technique, parameters...