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The Research on the Inventory Prediction in Supply Chain based on BP-GA Chaos Prediction Algorithm
Wencheng Liu 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.12
In the modern supply chain management, optimizing supply chain can reduce the cost of the enterprise. In the optimization of supply chain, the inventory optimization is a very important part. Through forecasting the inventory amount, we can reduce the cost of the inventory. And we also can optimize the supply chain. Because the supply chain network is complex, we use the chaos theory to study and predict the inventory. In this paper, we put forward a chaotic forecasting method which is based on the BP neural and genetic algorithm. This new method is BP-GA chaos prediction algorithm. We use the method to predict the inventory amount. The experiment shows that the method has achieved good forecasting effect.
Research on the Supply Chain Risk Assessment Based on the Improved LSSVM Algorithm
Wencheng Liu,Xianrong Zhang 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.8
In the increasingly fierce market competition, the survival environment that enterprises are facing is increasingly harsh. This makes the supply chain is facing more and more uncertainly factors gradually on the operating environment. In addition, this increases the likelihood of the risk. Therefore, the research on the supply chain risk assessment has the important practical significance. In this paper, we put forward the assessment indexes of the supply chain risk. Then, we use the improved ACO method to optimize the parameters of the LSSVM method and we propose the improved LSSVM method. After that, we use the method to assess and study the risk of the supply chain. Finally, the experiment indicates that the reliability and validity of the evaluation system.
Design and simulation analysis of innerouter compound meshing silent-chain plate
Wencheng Wang,Hui Liu,Guoqing Cai,Pengcheng Zhang 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.9
This paper proposes a detailed parametric design method for a round-pin innerouter compound meshing silent-chain plate structure. A meshing design method for parameter harmonization among a silent chain, a sprocket hob, and an involute sprocket is proposed. To analyze the influence of extended arc parameters on the meshing process and impact, the extended arc parameter extension δ and height HY are considered as variables to formulate the motion-analysis model of the chain-drive system. The results reveal that the extended arc parameters δ and HY have a significant effect on the meshing process and the meshing impact. When δ and HY are optimal, the inner-outer compound meshing process of the chaindrive system can be smoothly realized; furthermore, the meshing impact force is minimal as it is reduced by more than 25 % compared to when only the outer meshing process occurs. Thus, the chain-plate structure is optimized.
Ren, Shaofei,Liu, Wencheng,Song, Ying,Geng, Hang,Wu, Fangguang The Society of Naval Architects of Korea 2019 International Journal of Naval Architecture and Oc Vol.11 No.1
Interlocked armor layers of unbonded flexible risers may crush when risers are being launched. In order to predict the behavior of interlocked armor layers, they are usually simplified as rings with geometric and contact nonlinearity ignored in the open-literature. However, the equivalent thickness of the interlocked armor layer has not been addressed yet. In the present paper, a geometric coefficient ${\gamma}$ is introduced to the equivalent stiffness method, and a linear relationship between ${\gamma}$ and geometric parameters of interlocked armor layers is validated by analytical and finite element models. Radial stiffness and equivalent thickness of interlocked armor layers are compared with experiments and different equivalent methods, which show that the present method has a higher accuracy. Furthermore, hoop stress distribution of interlocked armor layer under crushing is predicted, which indicates the interlocked armor layer can be divided into two compression and two expansion zones by four symmetrically distributed singular points.
Qing Zhang,Wencheng Zhang,Jian Pan,Ling Liu,Haitao Zhang,Dong Zhao,Zhi Li,Xingyuan Zhang 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.9
Oleanolic acid (OA) as template molecule, polyamide-6 (PA6) as basement membrane and poly(styrene-comaleic acid) (PSMA) were used to prepare PA6/PSMA-OA molecularly imprinted composite membranes by phase inversion method in supercritical CO_2 (ScCO_2). The template molecule (OA), [poly(styrene-co-maleic anhydride) (PSMAH), PSMA, molecularly imprinted membranes (MIMs) imprinting OA and MIMs after elution were all characterized by Fourier transform infrared spectroscopy (FTIR). The conditions that were the mass ratio between PSMA and OA from 3:1 to 8:1, temperature of ScCO_2 from 35 ºC to 50 ºC and pressure of ScCO_2 12 MPa to 17 MPa were studied. It was obtained the largest adsorption rate and purity of OA after adsorption of the resultant MIMs, 50.41% and 96.15% respectively. After using PA6 film and non-woven fabrics as basement membrane respectively, it was found that smaller aperture of PA6 was used as basement membrane, a higher adsorption rate and a higher purity of OA after adsorption of the MIMs were obtained, and so were the stability and reproducibility of the resultant MIMs. After template molecules being removed, the MIMs had effective selectivity hydrogen bonding to separately bind in the binary components to the template molecules-oleanolic acid.
Shaofei Ren,Wencheng Liu,Ying Song,Hang Geng,Fangguang Wu 대한조선학회 2019 International Journal of Naval Architecture and Oc Vol.11 No.1
Interlocked armor layers of unbonded flexible risers may crush when risers are being launched. In order to predict the behavior of interlocked armor layers, they are usually simplified as rings with geometric and contact nonlinearity ignored in the open-literature. However, the equivalent thickness of the interlocked armor layer has not been addressed yet. In the present paper, a geometric coefficient g is introduced to the equivalent stiffness method, and a linear relationship between g and geometric parameters of interlocked armor layers is validated by analytical and finite element models. Radial stiffness and equivalent thickness of interlocked armor layers are compared with experiments and different equivalent methods, which show that the present method has a higher accuracy. Furthermore, hoop stress distribution of interlocked armor layer under crushing is predicted, which indicates the interlocked armor layer can be divided into two compression and two expansion zones by four symmetrically distributed singular points.
Xueqin Zhang,Wencheng Tu,Meitian Xiao,Yongjun Liu,Jing Ye 한국물리학회 2017 Current Applied Physics Vol.17 No.10
A one-step approach was developed to prepare carbon covered alumina (CCA) material by using Al-based MOFs (Al-PCP) as sacrificial template. Pt/CCA nanoparticle catalysts were characterized by using XRD, TGA, XPS, N2 sorption, SEM, TEM and elemental analysis and revealed that they retained the mesostructure with high Pt dispersion and had a CCA structure. Moreover, after reduced at 800 C, Pt/CCA-800 afforded the highest enantiomeric excess (84.8%) after chirally modified with cinchonidine at the second time reaction and can be recycled for more than 8 times without distinct loss of activity or enantioselectivity in the asymmetric hydrogenation of ethyl 2-oxo-4-phenylbutyrate.
Jinhua Zhang,Huiyue Qian,Wencheng Liu,Hao Chen,Yang Qu,Zhidong Lin 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.6
A heterostructural composite composed of g-C3N4 and Bi2O3 was achieved by the one-pot and thermal-induced polycondensation method using melamine and Bi(NO3)3 as precursor at 550 ℃ under air atmosphere. The crystalline phase, components and morphologies of the as-prepared composites were investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). Besides, the photocatalytic activity of composites was evaluated by degrading RhB aqueous solution at room temperature under visible light irradiation. Compared with bulk g-C3N4, the photocatalytic efficiency of the 0.5% Bi2O3/g-C3N4 (Bi–CN) was increased by up to four times. The introduction of Bi2O3 enhances not only the light absorption ability, but also the separation of photogenerated electron–hole pairs.
Mingxin Ye,Lei Xu,Jieyun Yan,Liying Liu,Liyong Ji,Wencheng Wang 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.44 No.32
Photo-degradation of electric eld poled alpha0-cyano-40-nitro-4-N,N-dimethylaminostilbene (CNDS) doped polymer was investigated by second-harmonic generation (SHG), UV-Vis absorption and FTIR. We found that the addition of a cyano group makes CNDS much more easily photoisomerized, and thus destroys the molecular ordering in poled chromophore doped polymers. A comparison experiment revealed that the photo-isomerization of CNDS is even easier than that of a modal system of azobenzene, which shows that CNDS has potential applications, such as in optical switches.
Zhang, Qing,Zhang, Xingyuan,Zhang, Wencheng,Pan, Jian,Liu, Ling,Zhang, Haitao,Zhao, Dong,Li, Zhi Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.9
Oleanolic acid (OA) as template molecule, polyamide-6 (PA6) as basement membrane and poly(styrene-comaleic acid) (PSMA) were used to prepare PA6/PSMA-OA molecularly imprinted composite membranes by phase inversion method in supercritical $CO_2$ ($ScCO_2$). The template molecule (OA), [poly(styrene-co-maleic anhydride) (PSMAH), PSMA, molecularly imprinted membranes (MIMs) imprinting OA and MIMs after elution were all characterized by Fourier transform infrared spectroscopy (FTIR). The conditions that were the mass ratio between PSMA and OA from 3:1 to 8:1, temperature of $ScCO_2$ from $35^{\circ}C$ to $50^{\circ}C$ and pressure of $ScCO_2$ 12 MPa to 17 MPa were studied. It was obtained the largest adsorption rate and purity of OA after adsorption of the resultant MIMs, 50.41% and 96.15% respectively. After using PA6 film and non-woven fabrics as basement membrane respectively, it was found that smaller aperture of PA6 was used as basement membrane, a higher adsorption rate and a higher purity of OA after adsorption of the MIMs were obtained, and so were the stability and reproducibility of the resultant MIMs. After template molecules being removed, the MIMs had effective selectivity hydrogen bonding to separately bind in the binary components to the template molecules-oleanolic acid.