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A Fast Bounded Parametric Margin Model for Support Vector Machine
Jingjing Zhang,Yuaihai Shao,Zhen Wang,Wei Chen 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.3
In this paper, a fast bounded parametric margin V -support vector machine (BP-V- SVM) for classification is proposed. Different from the parametric margin V -support vector machine (par-V -SVM), the BP-V -SVM maximizes a bounded parametric margin, and consequently the successive overrelaxation (SOR) technique could be used to solve our dual problem as opposed solving the standard quadratic programming problem (QPP) in par-V -SVM. Numerical experiments on several benchmark data sets and NDC data sets demonstrate the feasibility and effectiveness of the proposed algorithm.
Jingjing Zhang,이정무,Young-Hee Cho,Su-Hyeon Kim,Huashun Yu 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.5
Aluminum matrix composites with a high volume fraction of reinforcements are fabricated using a quickspontaneous infiltration process through a combustion reaction of an Al-Ti-B4C-CuO powder mixture in moltenaluminum. A cold-compacted powder mixture in a cylindrical shape was used as a preform. The effects of thecomposition of the initial powder mixture on the sustaining of the compact shape were systematically examinedand thereby an optimal composition for fabricating sound aluminum matrix composites was suggested. Thecompact shape was greatly affected by the initial composition of the powder mixture. A sufficiently high relativevolume fraction of the solid particles in the compact is critical for sustaining the compact shape during thecombustion reaction. The volume fraction of Al and Ti powders in the initial mixture affects whether crumblingof the compact occurs during the ignition delay time. This study can be beneficial to utilizing theAl-Ti-B4C system as to fabricate components with any desired shape.
Two-Step Infiltration of Aluminum Melts into Al-Ti-B4C-CuO Powder Mixture Pellets
Jingjing Zhang,이정무,Young-Hee Cho,Su-Hyeon Kim,Huashun Yu 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.2
Aluminum matrix composites with a high volume fraction of B4C and TiB2 were fabricated by a novel processing technique - a quick spontaneous infiltration process. The process combines a pressureless infiltration with the combustion reaction of Al-Ti-B4C-CuO in molten aluminum. The process is realized in a simple and economical way in which the whole process is performed in air in a few minutes. To verify the rapidity of the process, the infiltration kinetics was calculated based on the Washburn equation in which melt flows into a porous skeleton. However, there was a noticeable deviation from the calculated results with the experimental results. Considering the cross-sections of the samples at different processing times, a new infiltration model (two step infiltration) consisting of macro-infiltration and micro-infiltration is suggested. The calculated kinetics results in light of the proposed model agree well with the experimental results.
Jingjing Zhang,Yeong-Min Park,Xing Yan Tan,Mun Ki Bae,Dong Jun Kim,Tae Hwan Jang,Min Su Kim,Seung Whan Lee,김태규 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.6
Pigments with minute particle sizes, such as carbon black (CB) and pigment red 48:2 (P.R.48:2), are the most important types of pigment and have been widely used in many industrial applications. However, minute particles have large surface areas, high oil absorption and low surface energy. They therefore tend to be repellent to the vehicle and lose stability, resulting in significant increases in viscosity or reaggregation in the vehicle. Therefore, finding the best way to improve the dispersion properties of minute particle size pigments presents a major technical challenge. In this study, minute particle types of CB and P.R.48:2 were treated with nitrogen gas plasma generated via radio frequency-plasma enhanced chemical vapor deposition (RF-PECVD) to increase the dispersion properties of minute particles in deionized (DI) water. The morphologies and particle sizes of untreated and plasma treated particles were evaluated using scanning electron microscopy (SEM) and atomic force microscopy (AFM). The average distributions of particle size were measured using a laser particle sizer. Fourier transform infrared spectroscopy was carried out on the samples to identify changes in molecular interactions during plasma processing. The results of our analysis indicate that N2 plasma treatment is an effective method for improving the dispersibility of minute particles of pigment in DI water.
Zhang Zhijian,He Jingjing,Tang Xingchang,Wang Yuling,Yang Binbin,Wang Kunjie,Zhang Deyi 한국탄소학회 2019 Carbon Letters Vol.29 No.6
Energy and environmental are always two major challenges for the sustainable development of the modern human being. For avoiding the serious environmental pollution caused in the fabrication process of porous carbon, a popular energy storage material, we reported a facile, green and activating agent free route hereby directly carbonizing a special biomass, Glebionis coronaria. A nitrogen doped hierarchical porous carbon with a specific surface area of up to 1007 m2 g−1 and a N doping content of up to 2.65 at.% was facilely fabricated by employing the above route. Benefiting from the peculiarly hierarchical porous morphology, enhanced wettability and improved conductivity, the obtained material exhibits superior capacitance performance, which capacitance reaches up to 205 F g−1 under two-electrode configuration, and no capacitance loss is observed after 5000 cycles. Meanwhile, the capacitance retention of the obtained material arrives up to 95.0% even under a high current density of 20 A g−1, illuminating its excellent rate capability. The fabricated nitrogen-doped hierarchical porous carbon with larger capacitance than commercial activated carbon, excellent rate capability and cycle stability is an ideal cost-efficient substitution of commercial activated carbon for supercapacitor application.
The Research on Regional differences of China’s Trade effect from FDI
Zhang, Zongbin,Xin, Jingjing,Wu, Shuxin 한중경제문화학회 2015 한중경제문화연구 Vol.4 No.-
The relationship between international trade and foreign direct investment has been become one of the most important issues among scholars’ researches. The majority of scholars made promoting effects of foreign direct investment in the export trade as their main research content, which focused on the relationship between foreign direct investment and trade effects in the host country to verify alternative or complementary effects. Recently, they have begun to regard the home country as the research object, with the latest trade gravity model to study the FDI’s effect in the home country’s import and export trade. This paper elaborates the theory of Chinese foreign direct investment and trade effects, which highlights China’s foreign direct investment of trade effects, influencing factors of these effects and their path mechanism. Followed by the performance of the gravity model, empirical test comes that the external direct investment contributes to trade creation and regional differences, and put forward policy suggestions accordingly.
Least Squares Fuzzy One-class Support Vector Machine for Imbalanced Data
Jingjing Zhang,Kuaini Wang,Wenxin Zhu,Ping Zhong 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.8
Based on fuzzy one-class support vector machine (SVM) and least squares (LS) one-class SVM, we propose an LS fuzzy one-class SVM to deal with the class imbalanced problem. The LS fuzzy one-class SVM applies a fuzzy membership to each sample and attempts to solve the modified primal problem. Hence, we just need to solve a system of linear equations as opposed solving the quadratic programming problem (QPP) in fuzzy one-class SVM, which leads to an extremely simple and fast algorithm. Numerical experiments on several benchmark data sets demonstrate the feasibility and effectiveness of the proposed algorithm.
Experimental study of internal solitary wave loads on the semi-submersible platform
Zhang Jingjing,Liu Yi,Chen Ke,You Yunxiang,Duan Jinlong 대한조선학회 2021 International Journal of Naval Architecture and Oc Vol.13 No.1
A prediction method, based on the Morison equation as well as Froude-Krylov formula, is presented to simulate the loads acting on the columns and caissons of the semi-submersible platform induced by Internal SolitaryWave (ISW) respectively. Combined with the experimental results, empirical formulas of the drag and inertia coefficients in Morison equation can be determined as a function of the Keulegan eCarpenter (KC) number, Reynolds number (Re) and upper layer depth h1=h respectively. The experimental and calculated results are compared. And a good agreement is observed, which proves that the present prediction method can be used for analyzing the ISW-forces on the semi-submersible platform. Moreover, the results also demonstrate the layer thickness ratio has a significant effect upon the maximum horizontal forces on the columns and caissons, but both minimum horizontal and vertical forces are scarcely affected. In addition, the incoming wave directions may also contribute greatly to the values of horizontal forces exerted on the caissons, which can be ignored in the vertical force analysis.
Lotus-Like Nano-Architectures Constructed from Self-Assembled Micelles via Hierarchical Assembly
Rongli Zhang,Xiaoxia Fan,Xiaofang Xu,Jingjing Lv,Zhenzhen Jin,Hui Hao,Cuige Zhang 한국고분자학회 2018 Macromolecular Research Vol.26 No.1
Dopamine modified γ-polyglutamic acid (γ-PGA-DA) copolymer and melamine (Mel) can self-assemble into Mel/γ-PGA-DA micelles via weak intermolecular interactions in aqueous solution containing small amount of methanol. When Mel/γ-PGA-DA micellar solution was cast on the surface of formvar stabilized with carbon support films, the lotus-like nano-architectures were formed on the surface of substrate via hierarchical assembly of micelles. The size of lotus-like nanoarchitectures was approximately 200 nm×500 nm. The possible driving forces for hierarchical assembly of micelles were the solution fluid and interaction between micelles. The hierarchical assembly of micelles was similar to the fractal aggregation of inorganic particles and a possible reason was discussed.