Method of Image De-Noising Based on Non-Noisy Atoms Self Adaptive and Sparse Representation

Li Weizheng 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.8

In allusion to the losses of image detail and texture structure information during image de-noising process, an image de-noising algorithm based on non-related dictionary learning is proposed in this paper. Firstly, this algorithm is adopted to obtain self-adaption redundant dictionary for the noisy image through the dictionary learning algorithm; secondly, HOG features and gray-level statistical features of each atom in the dictionary are extracted to form the feature set, and meanwhile the feature set of the atoms is adopted to divide the atoms into two types (non-noisy atoms and noisy atoms); finally, the non-noisy atoms are adopted to recover the image, thus to realize the de-nosing purpose. The experiment result shows: the proposed algorithm does not need to know the prior information of the noise and PSNR performance thereof is better than that of existing algorithms, and meanwhile the proposed algorithm can well keep the image detail and texture structure information, thus to improve visual effect.

광탄성 위상이동법을 이용한 인장판 경사균열 선단주위의 프린지 해석

리웨이정(Weizheng Li),백태현(Tae Hyun Baek),홍동표(Dong Pyo Hong),이병희(Byung Hee Lee),서진(Jin Seo) 한국비파괴검사학회 2012 한국비파괴검사학회지 Vol.32 No.1

광탄성법은 실험역학에서 응력 또는 변형률을 해석하기 위한 여러 실험방법 중의 하나이며, 다양한 종류의 구조물의 응력 분포를 실험적으로 결정하는 기법이다. 광탄성법은 광탄성 영상의 등색 프린지와 등경 프린지로부터 광탄성 시편에 나타나는 전체의 응력장 분포를 정밀하게 측정할 수 있다. 본 논문에서는 여러 가지 광탄성 기법중 8단계 위상이동법(8-step phase-shifting method)에 관한 이론을 살펴보고, 경사균열이 있는 평판 시편에 인장을 가하여 나타난 광탄성 프린지로부터 경사균열 선단주위의 응력분포를 8단계 위상이동법으로 결정한 후, 이들 결과를 유한요소법(FEM)에 의한 결과와 비교하였다. 8단계 위상이동법을 이용한 실험에 의해 측정된 프린지 차수는 유한요소법에 의한 계산된 프린지 차수값에 근접하였다. Photoelasticity is a technique of experimental methods and has been widely used in various domains of engineering to determine the stress distribution of structures. Without complicated mathematical formulation, this technique can conveniently provide a fairly accurate whole-field stress analysis for a mechanical structure. Here, stress distribution around an inclined crack tip of finite-width plate is studied by 8-step phase-shifting method. This method is a kind of photoelastic phase-shifting techniques and can be used for the determination of the phase values of isochromatics and isoclinics. According to stress-optic law, the stress distribution could be obtained from fringe patterns. The results obtained by polariscope arrangement combined with 8-step method and ABAQUS FEM simulations are compared with each other. Good agreement between them shows that 8-step phase-shifting method is reliable and can be used for determination of stress by experiment.

Research for the Task Scheduling Algorithm Optimization based on Hybrid PSO and ACO for Cloud Computing

JieHui JU,WeiZheng BAO,ZhongYou WANG,Ya WANG,WenJuan LI,WenJuan LI 보안공학연구지원센터 2014 International Journal of Grid and Distributed Comp Vol.7 No.5

In cloud computing environment, there are a large number of users which lead to huge amount of tasks to be processed by system. In order to make the system complete the service requests efficiently, how to schedule the tasks becomes the focus of cloud computing Research. A task scheduling algorithm based on PSO and ACO for cloud computing is presented in this paper. First, the algorithm uses particle swarm optimization algorithm to get the initial solution quickly, and then according to this scheduling result the initial pheromone distribution of ant colony algorithm is generated. Finally, the ant colony algorithm is used to get the optimal solution of task scheduling. The experiment simulated on CloudSim platform shows that the algorithm has good effect in real-time performance and optimization capability. It is an effective task scheduling algorithm.

Wavelet Denoising Method Research of Soybean Straw Cellulose Near Infrared Rapid Detection

Weizheng Shen,Nan Ji,Haoran Du,Hongbin Li,Sida Ma,Qingming Kong 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.1

In this paper,we made a research for soybean straw hemicellulose rapid detection by establishing a quantitative analysis model based on near-infrared spectroscopy. At first,146 samples were collected from varieties of soybean straws are gathered in different areas of Heilongjiang province, then made chemical testing of components and spectral scanning to soybean straw, the 140 samples were classified to two groups, in which 100 samples were chosen as calibration set and the remaining 40 samples were chosen as verification set. Wavelet transform was used to deal with the noise spectrum, selected DBN wavelet, Haar wavelet and Symlet wavelet in different layers under penalty threshold, Bridge-massart threshold, and default global threshold for spectral signal decomposition and reconstruction, compared with other traditional noise reduction methods,Symlet2-2 layer decomposition wavelet basis for hemicellulose spectral processing possessed better effect with the determination coefficient of validation set rising from 0.462524 to 0.6314158 after processing.

The Design of System about Cow Activity Based on SVM

Weizheng Shen,Congcong Chen,Shuang Zheng,Shanjun He,Mingda Li 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.3

In view of the cow extensive farming, which lacks modern management tools, the cow estrus determine are often laid off. In this paper, a cow behavioral characteristic is designed. The system collects X, Y, Z axis acceleration data through triaxial accelerometer ADXL345, by ZigBee wireless network and RS485 sent to the information center, it’s based on the support vector of binary tree to classify their behavior. The result shows, the algorithm for cow’s stationary and moving classification accuracy was 93.26%, a slight and sharp motion accuracy was 84.81%, It provides an effective basis in judging cows in heat or in physical abnormalities. That system contributes to the refinement of cows feeding and health culture,and has great significance for the stable and healthy development of the dairy industry.

Simulation of Leaf Vein Based on Optimization Technique

Lei Chen,Weizheng Li,Gang-Won Jang,Tae-Hyun Baek 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.3

최적화기법에 의한 나뭇잎 그물맥 시뮬레이션

첸레이(Lei Chen),리웨이정(Weizheng Li),장강원(Gang Won Jang),백태현(Tae Hyun Baek) 대한기계학회 2013 大韓機械學會論文集B Vol.37 No.4

본 연구에서는 나뭇잎 그물맥 구조를 시뮬레이션하기 위해 잎 그물맥을 상 하 보강 박막판과 비압축성 유체가 흐르는 중간층 구조로 모델링하여 다중물리 현상으로 간주하고, 위상 최적화법을 다중물리 설계영역에 적용하였다. Mindlin-Reissner 판 모델에 기인한 횡방향 전단잠금 문제를 해결하기 위해 P1 비적합 요소와 선택 감소 적분법을 이용하였다. 다시-스토크스 유체 유동 채널에 대해 최적설계법을 적용하여 유동 시스템의 다중물리 모델을 해석하였으며, 잎의 그물맥 시뮬레이션을 수행하였다. 계산된 최적형상을 잎의 자연 그물 맥 패턴과 비교하였으며 비슷한 형상을 얻었다. 이와 같은 학제간 연구를 통해 나무 잎 그물맥 시스템을 이해할 수 있는 계기가 될 것으로 사료된다. This study attempts to simulate the structure of a woody leaf netted venation system by using topology optimization techniques. Based on finite element method (FEM) analysis of an incompressible fluid, a topology optimal design is applied to those woody leaf netted venation models. To solve the transverse shear locking problem of a thin plate caused by the Mindlin-Reissner plate model where a leaf netted venation is assumed to be a thin plate, a P1-nonconforming element and selective reduced integration are employed. Topology optimal design is applied to multiple physical domains. Combined with the Darcy-Stokes flow problems and extended to the optimal design of fluid channels, the multiple physical models of the flow system are analyzed and venation patterns of leafs are simulated. The calculated optimal shapes are compared with the natural shapes of woody leaf venation patterns. This interdisciplinary approach may improve our understanding of the leaf venation system.

Near-infrared Detection of Straw Cellulose by Orthogonal Signal Correction and Partial Least Squares

Qingming Kong,Zhongbin Su,Weizheng Shen,Mingming Han,Bohan Li,Xudong Wang 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.5

Orthogonal signal correction (OSC)and partial least squares(PLS)were used during the pretreatment of straw to reduce environmental noise and prediction models were established for near-infrared detection of straw cellulose. Tests were run with soybean stalk as the object of study. Test results indicated that compared to a model established using a traditional denoising method, the determination coefficients for calibration set models established by second derivative+smoothing and OSC were 0.9318595 and 0.9328905 respectively while the root mean square error for calibration (RMSEC) were 0.6762902 and 0.6696454. For an OSC-PLS regression model with a factor of 8, the relative standard deviation of a prediction model was less than 5%. In the OSC denoising process, the root mean square error fluctuated with the increasing number of PLS factors. Compared to the second derivative-smoothing denoising, OSC-PLS denoising removed the non-correlated variation from spectra and improved interpretation ability of variation while the analysis and convergence were expedited. It was therefore concluded that OSC-PLS denoising could be used to realize the rapid and accurate near-infrared detection of straw cellulose.

광탄성 위상이동법을 이용한 경사균열 선단주위의 응력분포 결정법

첸레이(Lei Chen),리웨이정(Weizheng Li),백태현(Tae Hyun Baek) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5

Photoelasticity method is one kind of experimental method and has been widely used in many domains of engineering to determine the stress distribution of structures. Without complicated mathematical formulation, this technique can conveniently provide a fairly accurate whole-field stress analysis for a mechanical structure. Here, an inclined crack tips of finite-width plate made of PSM-1 is studied by 8-step phase-shifting method. This method is one kind of photoelastic phase-shifting technique and can be used for the determination of the phase values of isochromatics and isoclinics. According to stress-optic law, the stress distribution could be obtained from fringe patterns. The results obtained by polariscope arrangement combined with 8-step method and ABAQUS FEM simulations are compared with each other. Good agreement shows that 8-step phase-shifting method is reliable and reasonable.

Contribution of Magnetostriction and Electromagnetic Force to Transformer Core Vibration

Zhu Lihua(주리화),Li Weizheng(리웨이쳉),He Zhiwei(허지웨이),Chang-seop Koh(고창섭) 대한전기학회 2019 대한전기학회 학술대회 논문집 Vol.2019 No.7

Power transformer is widely used as the key equipment of power transmission system. At the same time, with the improvement of people"s awareness of environmental protection, the problem of core vibration in the operation of transformer has attracted more and more attention. The vibration of transformer core is mainly caused by magnetostriction(MS) and electromagnetic force(EF) and that the transformer corner is the concentrated reflection area is universally acknowledged. A three-dimensional model for a square ring core containing the overlap area of the corner is firstly developed and then the distribution of MS and EF and the vibration displacement caused by the two forces acting alone are calculated under normal working conditions. At the same time, the transformer may work in abnormal working conditions such as DC bias or harmonics, which will cause MS and EF to increase in varying degrees. The contribution of MS and EF to core vibration under different working conditions is analyzed and a conclusion is drawn that EF is much smaller than MS in normal working condition, but under abnormal working conditions, EF increases rapidly and should not be neglected.