On the Subdifferential of a Nonlinear Complementarity Problem Function with Nonsmooth Data

Yan Gao 한국전산응용수학회 2009 Journal of applied mathematics & informatics Vol.27 No.1

In this paper, a system of nonsmooth equations reformulated from a nonlinear complementarity problem with nonsmooth data is studied. The formulas of some subdifferentials for related functions in this system of nonsmooth equations are developed. The present work can be applied to Newton methods for solving this kind of nonlinear complementarity problem. In this paper, a system of nonsmooth equations reformulated from a nonlinear complementarity problem with nonsmooth data is studied. The formulas of some subdifferentials for related functions in this system of nonsmooth equations are developed. The present work can be applied to Newton methods for solving this kind of nonlinear complementarity problem.

Collaborative Filtering Recommendation Model Based on Normalization Method

Gao Yan 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.10

In view of traditional collaborative filtering recommendation does not take into account differences of dimension of user vector and value of evaluation, this paper proposed a collaborative filtering recommendation model based on normalization method. Before calculating the user’s or item’s similarity, the value of evaluation will be normalized to a range of specifications. Then the similarity of user vector will be calculated, and predictions and recommend will be made. The experimental results show that this model could accurately find similar neighbor users or items, and performances of prediction and recommendation have been largely improved.

Comparative and Analysis on Mental Health Status of Nursing Students in Different Grades

Yan Gao 한국간호과학회 2011 한국간호과학회 학술대회 Vol.2011 No.10

Wireless Energy-Harvesting Cognitive Radio with Feature Detectors

( Yan Gao ),( Yunfei Chen ),( Zhibin Xie ),( Guobing Hu ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.10

The performances of two commonly used feature detectors for wireless energy-harvesting cognitive radio systems are compared with the energy detector under energy causality and collision constraints. The optimal sensing duration is obtained by analyzing the effect of the detection threshold on the average throughput and collision probability. Numerical examples show that the covariance detector has the optimal sensing duration depending on an appropriate choice of the detection threshold, but no optimal sensing duration exists for the ratio of average energy to minimum eigenvalue detector.

Robust Resilient H∞ State Estimation for Time-varying Recurrent Neural Networks Subject to Probabilistic Quantization Under Variance Constraint

Yan Gao,Junhua Du,Jun Hu,Hui Yu 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.2

This paper is concerned with the robust resilient H∞ state estimation problem for time-varying recurrent neural networks (TVRNNs) with probabilistic quantization under variance constraint. Here, a situation is considered where the signals are quantized before entering the network, and the occurrence probability is assumed to be known. In addition, during the design of the state estimation algorithm, the additive variation of the estimator gain is considered to reflect the parameter deviation that may occur during the execution. The main purpose is to design a finite-horizon resilient state estimation algorithm such that, in the presence of probabilistic quantization and estimator gain perturbation, some sufficient criteria are obtained for the estimation error system to satisfy the prescribed H∞ performance requirement within the finite-horizon and the error variance boundedness. Finally, a numerical example is conducted to verify the feasibility of the presented estimation algorithm against the probabilistic quantization and estimator gain perturbation.

ON THE SUBDIFFERENTIAL OF A NONLINEAR COMPLEMENTARITY PROBLEM FUNCTION WITH NONSMOOTH DATA

Gao, Yan The Korean Society for Computational and Applied M 2009 Journal of applied mathematics & informatics Vol.27 No.1

In this paper, a system of nonsmooth equations reformulated from a nonlinear complementarity problem with nonsmooth data is studied. The formulas of some subdifferentials for related functions in this system of nonsmooth equations are developed. The present work can be applied to Newton methods for solving this kind of nonlinear complementarity problem.

Release Variation and Effects on Human Physiological response of Volatile Organic Compounds from Landscape Trees

Gao Yan,Jin Youju 한국응용곤충학회 2005 한국응용곤충학회 학술대회논문집 Vol.2005 No.05

Highly efficient, durable and eco-friendly intumescent flame retardant for wool fabrics

Yan Gao,Jin-Feng Li 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.4

According to the requirements of flame retardant and environmental protection of wool fabrics, a phosphorus-nitrogen intumescent flame-retardant (IFR) system was constructed on the surface of wool fabrics based on dip-rolling-drying process with DEA serving as carbonizing agent, phosphorous acid and phosphoric acid used as acids, and urea serving as blowing agent. Ammonium N-ethoxy-n-methylene phosphonate-n-ethyl phosphate (ANPP) was designed and the treated wool fabrics with a weight gain (WG) of 27.4% presented highly flame retardancy and exhibited a high limiting oxygen index (LOI) of 37.8%; after 50 laundering cycles (LCs), LOI can still be remained at 30.5%. Self-extinguishing properties in the vertical combustion. The cone calorimeter (CONE) test verified that the peak heat release rate (PHRR) of the untreated wool fabrics declined to 82.2 from 251.7 kW/m2 after ANPP treatment, and the total heat release (THR) was reduced to 4.4 from 37.9 MJ/m2. In addition, the physical properties were maintained in the usable range. The flame-retardant mechanism analysis showed that the dense phosphorus-nitrogen char layer shaped effectively prevented the release of heat and spread of flammable volatile substances in the condensed phase. This study supplies novel ideas on devising and manufacturing of environmentally friendly treated wool fabrics with superior flame retardancy, durability, and high efficiency.

Hollow submicron-sized spherical conducting polyaniline particles and their suspension rheology under applied electric fields

Gao, Chun Yan,Meng, Long-Yue,Piao, Shang Hao,Choi, Hyoung Jin Elsevier 2018 Polymer Vol.140 No.-

<P><B>Abstract</B></P> <P>Conducting polymeric polyaniline hollow spheres (PANI-HS) were fabricated and evaluated as a smart electro-stimuli responsive material, whose both special structure of shorter diffusion length promotes the electron transfer and specific surface area is greatly amplified than solid spheres. The monodisperse polystyrene (PS) seeds were initially synthesized by a facile surfactant-free emulsion polymerization, and then the monomer aniline was adsorbed and polymerized on the sulfonated PS spheres to form the PS/polyaniline (PANI) composites, allowing the PS cores to be removed by a solvent extraction later. The morphology and shell thickness were examined using both scanning electron microscopy and transmission electron microscopy. Fourier transformation infrared spectroscopy affirmed chemical structure of pure PS, PS/PANI and PANI-HS. The dielectric spectra were further analyzed for their electrorheological (ER) characteristics with LCR meter. The homogeneous semi-conducting PANI-HS based ER fluid (10 vol%) exhibited typical ER characteristics according with the conductivity model based on a slope of 1.5.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hollow polyaniline (PANI-HS) was adopted as an electrorheological (ER) material. </LI> <LI> Its special structure of shorter diffusion length promotes electron transfer. </LI> <LI> PS cores in PS/PANI composite were removed by solvent extraction. </LI> <LI> ER fluid showed typical ER characteristics with a slope of 1.5. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Conducting polyaniline hollow submicron-sized spheres (PANI-HS) were fabricated and evaluated as a smart electro-stimuli responsive material. Polystyrene (PS) seeds were initially synthesized by a facile surfactant-free emulsion polymerization, and then the aniline was adsorbed and polymerized on the sulfonated PS spheres to form the PS/PANI composites, allowing the PS cores to be removed by a solvent extraction later. Their electrorheological behaviors of hollow PANI based ER fluid (10 vol %) were observed using a rotational rheometer at different electric field strengths, showing dramatic electro-stimuli responsive phase transition.</P> <P>[DISPLAY OMISSION]</P>

Investigations into film cooling and unsteady flow characteristics in a blade trailing-edge cutback region

Yan Gao,Xin Yan,Jun Li,Kun He 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.10

Unsteady flow characteristic and film cooling effect in the blade trailing edge cutback region are numerically investigated using DES (detached eddy simulation) method at three blowing ratios, four lip thickness ratios and three rib geometries. With the experimental data, reliability and accuracy of the numerical methods are validated. The results indicate that, compared with RANS (Reynolds-averaged Navier-Stokes) equations solutions, the DES method has a superior accuracy in predicting the film cooling effectiveness on trailing-edge cutback. The lip thickness has a pronounced effect on shedding vortex scale downstream the slot. As the lip thickness ratio decreases, the film cooling effect on trailing edge cutback is improved. Compared with the line ribs, the arrangement of pin fin ribs enhances the uniformity of coolant coverage on trailing edge cutback along lateral direction. However, with different types of rib, the film cooling effectiveness on the trailing edge cutback is mainly determined by the stable cooling flow structures and mixing effect between mainstream and coolant. The development of vortex system downstream the slot is significantly affected by the blowing ratio, which in turn influences the film cooling effect on trailing edge cutback.