Multi-focus Image Fusion with Cartoon-Texture Image Decomposition

Yongxin Zhang,Hongan Li,Zhihua Zhao 보안공학연구지원센터(IJSIP) 2015 International Journal of Signal Processing, Image Vol.8 No.1

Multi-focus image fusion can fuse multiple source images with different focus settings into a single image that appears sharper. How to effectively and completely represent the source images is the key to multi-focus image fusion. A multi-component fusion method is proposed for multi-focus image fusion. The registered source images are decomposed into cartoon and texture components by cartoon-texture image decomposition. The salient features are selected from the cartoon and texture components respectively to form a composite feature space. The local features that represent the salient information of the source images are integrated to construct the fused image. According to the visual perception and objective evaluations on the fused images, the proposed method works better in extracting the focused regions and improving the fusion quality, compared with the other existing single-component fusion methods.

FAFS: A Fuzzy Association Feature Selection Method for Network Malicious Traffic Detection

( Yongxin Feng ),( Yingyun Kang ),( Hao Zhang ),( Wenbo Zhang ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.1

Analyzing network traffic is the basis of dealing with network security issues. Most of the network security systems depend on the feature selection of network traffic data and the de-tection ability of malicious traffic in network can be improved by the correct method of feature selection. An FAFS method, which is short for Fuzzy Association Feature Selection method, is proposed in this paper for network malicious traffic detection. Association rules, which can reflect the relationship among different characteristic attributes of network traffic data, are mined by association analysis. The membership value of association rules are obtained by the calculation of fuzzy reasoning. The data features with the highest correlation intensity in network data sets are calculated by comparing the membership values in association rules. The dimension of data features are reduced and the detection ability of malicious traffic detection algorithm in network is improved by FAFS method. To verify the effect of malicious traffic feature selection by FAFS method, FAFS method is used to select data features of different dataset in this paper. Then, K-Nearest Neighbor algorithm, C4.5 Decision Tree algorithm and Naïve Bayes algorithm are used to test on the dataset above. Moreover, FAFS method is also compared with classical feature selection methods. The analysis of experimental results show that the precision and recall rate of malicious traffic detection in the network can be signifi-cantly improved by FAFS method, which provides a valuable reference for the establishment of network security system.

Aerodynamic Flutter Control for Typical Girder Sections of Long-Span Cable-Supported Bridges

Yongxin Yang,Yaojun Ge 한국풍공학회 2009 Wind and Structures, An International Journal (WAS Vol.12 No.3

Aerodynamic flutter control for long-span cable-supported bridges was investigated based on three basic girder sections, i.e. streamlined box girder section, box girder section with cantilevered slabs and two-isolated-girder section. Totally four kinds of aerodynamic flutter control measures (adding fairings, central-slotting, adding central stabilizers and adjusting the position of inspection rail) were included in this research. Their flutter control effects on different basic girder sections were evaluated by sectional model or aeroelastic model wind tunnel tests. It is found that all basic girder sections can get aerodynamically more stabled with appropriate aerodynamic flutter control measures, while the control effects are influenced by the details of control measures and girder section configurations. The control effects of the combinations of these four kinds of aerodynamic flutter control measures, such as central-slotting plus central-stabilizer, were also investigated through sectional model wind tunnel tests, summarized and compared to the flutter control effect of single measure respectively.

A New Kind of Hybrid UHVDC System Dedicated for Long-Distance Power Delivery and Regional Power Grids Back-to-Back Hierarchical Interconnection

Yongxin Chen,Xianggen Yin,Xingzhu Wang,Xiangyuan Yin,Wenbin Cao,Yuanlin Pan 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

This paper proposes a hybrid UHVDC system dedicated for long-distance power transmission and back-toback interconnection of the receiving region power grids. The receiving terminal of the UHVDC system is formed by the LCC and MMC in cascaded connection. The system combines the merits of hierarchical connection and asynchronous interconnection, which optimizes the network structure of the receiving system and makes the power distribution of the receiving region grids more flexible. The topology of the system is introduced in detail. The control strategy and the DC fault clearing strategy are proposed. Finally, the UHVDC system is built in PSCAD / EMTDC. The simulation verifies the effectiveness of the control strategy, the DC fault clearing strategy and the re-starting strategy. The results indicate that this kind of UHVDC system has a good application prospect in large-capacity long-distance power transmission to the asynchronous regional power grids.

A Novel Flow Diverter (Tubridge) for the Treatment of Recurrent Aneurysms: A Single-Center Experience

Yongxin Zhang,Qing-Hai Huang,Yibin Fang,Pengfei Yang,Yi Xu,Bo Hong,Jianmin Liu 대한영상의학회 2017 Korean Journal of Radiology Vol.18 No.5

Objective: The Tubridge flow diverter (FD) is a novel device aimed at reconstructing the parent artery and occluding complex aneurysms. Retreatment of recurrent aneurysms using the FD is challenging. We report our initial experience in the repair of aneurysm recurrence with the FD. Materials and Methods: A database was reviewed prospectively, and 8 patients with 8 recurrent aneurysms (mean size, 16.7 mm) were identified. Four aneurysms had previously ruptured. The previous aneurysm treatment consisted of coiling in 1 aneurysm and single-stent-assisted coiling in 7 aneurysms. The procedural complications and clinical and angiographic outcomes were analyzed. Results: Six aneurysms were treated by using a single Tubridge FD alone, while the remaining 2 were treated with FD + coiling. The immediate results of the 8 aneurysms were that they all showed incomplete occlusion. Neither major ischemic nor hemorrhagic complications occurred; however, 1 patient experienced a vasospasm. Follow-up angiographies were available for 7 aneurysms; the mean follow-up was 16.9 months (7–36 months). Five aneurysms were completely occluded, whereas 2 had a residual neck. Severe asymptomatic stenosis of 1 parent artery of a vertebral artery dissecting aneurysm was found. All visible branches covered by the FD were patent. All patients were clinically assessed as having attained a favorable outcome (modified Rankin Scale score ≤ 2) at discharge and follow-up. Conclusion: In selected patients, the Tubridge FD can provide a safe and efficient option for the retreatment of recurrent aneurysms. Nevertheless, attention should be paid to several technical points.

Temporomandibular Joint Disorders as a Cause of Aural Fullness

Yongxin Peng 대한이비인후과학회 2017 Clinical and Experimental Otorhinolaryngology Vol.10 No.3

Objectives. Temporomandibular joint disorders (TMD) are often associated with aural manifestations. However, it is not clear whether aural fullness could be induced by TMD. The purpose was to investigate the TMD and effectiveness of TMD treatments in patients with mainly or exclusively aural fullness complaint. Methods. One hundred and twelve patients, who had aural fullness as the main or sole complaint, presented to the Otolaryngology Department, PLA Army General Hospital, Beijing, China, between January 2010 and January 2015. Patients’ medical history indicated that they had previously been diagnosed and treated for otitis media or sensorineural hearing loss but without positive results. Patients were subjected to pure tone audiometry and acoustic immittance screening using GSI-61 clinical audiometer and GSI TympStar middle ear analyzer respectively. Patients were examined by questionnaire, X-ray and/or computed tomography scan of temporomandibular joint. TMD was categorized according to the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD). Patients were then treated for TMD. Results. All the patients showed normal eardrum and type A tympanogram. The patients of 60.7% (68/112) were classified as group I TMD disorders (muscle disorders), 34.8% (39/112) were group II (disc displacements), and 4.5% (5/112) were group III (arthralgia, osteoarthritis, and osteoarthrosis). Aural fullness was completely resolved or significantly improved in 67 and 34 patients respectively following treatments aimed at improving TMD, with a combined effectiveness of 90.2% (101/112). TMD treatments are especially effective (94.1%) in group I TMD. Conclusion. TMD as a potential cause of aural fullness should be considered in otolaryngology practice.

Evaluation on bridge dynamic properties and VIV performance based on wind tunnel test and field measurement

Yongxin Yang,Tingting Ma,Yaojun Ge 한국풍공학회 2015 Wind and Structures, An International Journal (WAS Vol.20 No.6

Full scale measurement on the structural dynamic characteristics and Vortex-induced Vibrations (VIV) of a long-span suspension bridge with a central span of 1650 m were conducted. Different Finite Element (FE) modeling principles for the separated twin-box girder were compared and evaluated with the field vibration test results, and the double-spine model was determined to be the best simulation model, but certain modification still needs to be made which will affect the basic modeling parameters and the dynamic response prediction values of corresponding wind tunnel tests. Based on the FE modal analysis results, small-scaled and large-scaled sectional model tests were both carried out to investigate the VIV responses, and probable Reynolds Number effects or scale effect on VIV responses were presented. Based on the observed VIV modes in the field measurement, the VIV results obtained from sectional model tests were converted into those of the three-dimensional (3D) full-scale bridge and subsequently compared with field measurement results. It is indicated that the large-scaled sectional model test can probably provide a reasonable and effective prediction on VIV response.

Least squares solutions of the matrix equation AXB=D overgeneralized reflexive X

Yongxin Yuan 한국전산응용수학회 2008 Journal of applied mathematics & informatics Vol.26 No.3-4

Let R∈Cm×m and S ∈ Cn×n be nontrivial unitary involutions, i.e., R* = R = R-¹ ≠ Im and S* = S = S-¹ ≠ In. We say that G ∈ Cm×n is a generalized reflexive matrix if RGS = G. The set of all m × n generalized reflexive matrices is denoted by GRCm×n. In this paper, an efficient method for the least squares solution ∈ 2 GRCm×n of the matrix equation AXB = D with arbitrary coefficient matrices A ∈ Cp×m, B ∈ Cn×q and the right-hand side D ∈ Cp×q is developed based on the canonical correlation decomposition(CCD) and, an explicit formula for the general solution is presented. Let R∈Cm×m and S ∈ Cn×n be nontrivial unitary involutions, i.e., R* = R = R-¹ ≠ Im and S* = S = S-¹ ≠ In. We say that G ∈ Cm×n is a generalized reflexive matrix if RGS = G. The set of all m × n generalized reflexive matrices is denoted by GRCm×n. In this paper, an efficient method for the least squares solution ∈ 2 GRCm×n of the matrix equation AXB = D with arbitrary coefficient matrices A ∈ Cp×m, B ∈ Cn×q and the right-hand side D ∈ Cp×q is developed based on the canonical correlation decomposition(CCD) and, an explicit formula for the general solution is presented.

Multi-focus Image Fusion Based on Sparse Features

Yongxin Zhang,Li Chen,Zhihua Zhao,Jian Jia 보안공학연구지원센터(IJSIP) 2014 International Journal of Signal Processing, Image Vol.7 No.2

A Novel Method for the Stability Assessment of Soil Slopes with Multi-layers Based on the Upper Bound Limit Analysis

Yongxin Li,Yining Hu,Fu Huang,Shuqin Li,Zhibin Sun 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.8

The discrete technique combined with the upper bound approach is applied to analyze the stability of soil slopes with multiple layers in this paper. Based on the geometrical relationship derived from the normality requirement, an algorithm is proposed to determine the coordinates of discrete points on the failure surface. Specifically, these points are generated from the initial point to the terminal point. After completion of the discrete sliding surface, the sliding block is sliced by the vertical slice technique. Equations with integral form for rates of internal energy dissipation and external work are then derived. The scheme for calculation of the safety factor is presented by means of the strength reduction method and the optimization algorithm. Comparison analysis based on four examples under various conditions demonstratesthe validity of the proposed method in addressing stability problem of slopes with multiple layers.