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WARRANTY STRATEGY IN A SUPPLY CHAIN WHEN TWO RETAILER'S EXTENDED WARRANTIES BUNDLED WITH THE PRODUCTS

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Journal of Systems Science and Systems Engineering 2015年第3期24卷 364-388页

作者： yiwen Bian Shuai Yan Wei Zhang Hao Xu SHU-UTS SILC(Sydney Institute of Language & Commerce) Business School Shanghai University School of Management Zhejiang University School of Business Anhui University

We in this paper examine warranty strategy in a two-stage supply chain consisting of a manufacturer and two competing retailers. The manufacturer produces two substitute products and markets them through the two retailers to a group of consumers, respectively. For each type of products, the manufacRtrer＇s base warranty and a retailer＇s extended warranty are bundled with the product. We use game theoretic models to explore the interactions between the two types of warranties and the competition between the retailers. For this purpose, two scenarios are considered： no retailer and both the two retailers providing the extended warranties, respectively. In each scenario, the manufacturer＇s base warranties are assumed to be offered. Our results show that when the retailers offer their extended warranties, the manufacturer has no incentive to offer the base warranties; otherwise, the manufacturer has to provide the base warranties. The competition between retailers in terms of the product substitutability has no impact on warranty decisions, but affects all players＇ profits in the supply chain. The manufacturer can provide a longer warranty length and higher customer welfare to a customer than the retailers do, if it is more efficient than the retailers in warranty cost-efficiency, and vice versa.

关键词： Base warranty extended warranty supply chain competition.

Advancing sustainable agriculture: Enhancing crop nutrition with next-generation nanotech-based fertilizers

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Nano Research 2023年第12期16卷 13205-13225页

作者： yiwen Liao Dawei Xu Yuhong Cao Yong-Guan Zhu State Key Laboratory of Urban and Regional Ecology Research Centre for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China CAS Key Laboratory for Biological Effects of Nanomaterials and Nanosafety National Center for Nanoscience and TechnologyBeijing 100190China

The pressing need to enhance nutrient use efficiency(NUE)in fertilizers has become increasingly urgent in light of food insecurity and climate-related *** offers promising prospects for the development of effective and environmentally friendly alternatives in the field of *** review focuses on the impact of nanotechnology on conventional fertilizers,encompassing inorganic,organic,and microbial *** emphasize the superior attributes of nano-fertilizers compared with their conventional counterparts and explore their potential and versatility in boosting crop productivity,reducing fertilizer expenses,and mitigating detrimental environmental *** conclusion,given the significant challenges posed by food insecurity and climate change,the application of nano-fertilizers demonstrates immense potential for advancing sustainable and intelligent agricultural practices.

关键词： nanobiotechnology nano-fertilizers(NFs) nutrient use efficiency(NUE) slow release sustainable agriculture

ADVANCE SELLING IN THE PRESENCE OF PRODUCT DIFFUSION EFFECT

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Journal of Systems Science and Systems Engineering 2017年第1期26卷 77-99页

作者： Xiaoyan Xu Xuemei Li yiwen Bian Yanhong Sun School of Management University of Science & Technology of China Hefei 230026 China School of Management Zhejiang University Hangzhou 310058 China SHU-UTS SILC Business School Shanghai University Shanghai 201899 China

Product diffusion refers to the phenomenon that the later demand is dependent on the early sales. To investigate how a firm＇s advance selling strategy is affected by the effect of product diffusion, we consider a monopolist seller who sells a fashionable product in a market that comprises of myopic and strategic consumers over two periods （i.e., the advance selling season and the regular selling season）. For a linear product diffusion effect we fred that, when the effect of product diffusion is positive, the seller may set an extremely high advance selling price to induce the strategic consumers to purchase in the regular selling season, which is counter-intuitive. Moreover, the optimal procurement quantity for the seller may increase in the negative effect of product diffusion and decrease in the amount of strategic consumers. When we extend our model to consider a concave quadratic product diffusion effect, however, the optimal procurement quantity is concave in the amount of strategic consumers. Numerical studies are further presented to discuss the managerial insights.

关键词： Advance selling product diffusion strategic consumer behavior interface on marketing andoperations management

Distribution of Holttumochloa (Poaceae＂ Bambusoideae) in China with description of a new species revealed by morphological and molecular evidence

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Plant Diversity 2017年第3期39卷 135-139页

作者： Mengyuan Zhou Jingxia Liu yiwen Liang Dezhu Li Plant Germplasrn and Genomics Center Cermplasm Bank of Wild Species Kunming Institute of Botany Chinese Academy of Sciences Kunming Yunnan650201 China Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of Botany Chinese Academy of Sciences Kunming Yunnan 650201China Diaoluo Mountain National Nature Reserve Lingshui Hainan 572434 China University of Chinese Academy of Sciences Beijing 100049 China

Holttumochloa has previously only been recorded from Malaysia. Here we describe and illustrate a new species, Holttumochloa hainanensis sp. nov., from the lowland montane forests of Diaoluo Mountain on the Island of Hainan, South China. Morphologically, H. hainanensis is similar to Holttumochloa korbuensis,but can be clearly distinguished from it in having larger culms covered by white wax, longer leaf blades,larger pseudospikelets and anthers. Furthermore, molecular phylogeny based on the nuclear gene GBSSI corroborates the identification of the new species and its affinity. The biogeographical significance of the new record of Holttumochloa in South China is also highlighted in this study.

关键词： Holttumochloa hainanensis Taxonomy GBSSI phylogeny Biogeography Bambusinae

FedCDR:Privacy-preserving federated cross-domain recommendation

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Digital Communications and Networks 2022年第4期8卷 552-560页

作者： Dengcheng Yan Yuchuan Zhao Zhongxiu Yang Ying Jin yiwen Zhang School of Computer Science and Technology Anhui UniversityHefeiChina Weifang Key Laboratory of Blockchain on Agricultural Vegetables Weifang University of Science and TechnologyWeifangChina Department of Management Hefei UniversityHefeiChina

Cross-Domain Recommendation(CDR)aims to solve data sparsity and cold-start problems by utilizing a relatively information-rich source domain to improve the recommendation performance of the data-sparse target ***,most existing approaches rely on the assumption of centralized storage of user data,which undoubtedly poses a significant risk of user privacy leakage because user data are highly *** this end,we propose a privacy-preserving Federated framework for Cross-Domain Recommendation,called *** our method,to avoid leakage of user privacy,a general recommendation model is trained on each user's personal device to obtain embeddings of users and items,and each client uploads weights to the central *** central server then aggregates the weights and distributes them to each client for ***,because the weights implicitly contain private information about the user,local differential privacy is adopted for the gradients before uploading them to the server for better protection of user *** distill the relationship of user embedding between two domains,an embedding transformation mechanism is used on the server side to learn the cross-domain embedding transformation *** experiments on real-world datasets demonstrate that ourmethod achieves performance comparable with that of existing data-centralized methods and effectively protects user privacy.

关键词： Cross-domain recommendation Federated learning Privacy preserving

Self-correcting wavelet neural network control of continuous rotary electro-hydraulic servo motor

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High Technology Letters 2021年第1期27卷 26-37页

作者： Wang Xiaojing Li Chunhui Peng yiwen Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of EducationHarbin University of Science and TechnologyHarbin 150080P.R.China

In allusion to the problem of friction,leakage,vibration and noise existing in continuous rotary motor electro-hydraulic servo system,highly nonlinearity and uncertainties affecting the system performance,based on the transfer function of electro-hydraulic servo system,a kind of Pol-Ind friction model is *** parameters of Pol-Ind friction model are identified and the accurate mathematical model of friction torque is obtained by *** self-correcting wavelet neural network(WNN)controller is proposed,and Adam optimization algorithm is used to perform gradient optimization on scale factor and displacement factor in wavelet basis function,so as to improve the speed and precision of parameter *** comparative simulation analysis,it is clearly that the self-correcting WNN controller can effectively improve the frequency response and tracking accuracy of continuous rotary motor electro-hydraulic servo system.

关键词： continuous rotary electro-hydraulic servo motor Pol-Ind friction model self correcting wavelet neural network(WNN) Adam optimization algorithm

Hydrogenation Conversion of Phenanthrene over Dispersed Mo-based Catalysts

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China Petroleum Processing & Petrochemical Technology 2015年第3期17卷 7-14页

作者： Hu yiwen Da Zhijian Wang Zijun SINOPEC Research Institute of Petroleum Processing

With oil-soluble molybdenum compound and sublimed sulfur serving as raw materials, two dispersed Mo-based catalysts were prepared, characterized and then applied to the hydrogenation conversion of phenanthrene. The test results showed that under the conditions specified by this study, the catalyst prepared in a higher sulfiding atmosphere was more catalytically active due to its higher content of MoS2 and stronger intrinsic catalytic activity of MoS2 unit, which demonstrated that the sulfiding atmosphere for the preparation of catalysts not only could influence the yield of MoS2 but also the structure of *** analysis on the selectivity of octahydrophenanthrene isomers revealed that the catalyst prepared in a lower sulfiding atmosphere had a relatively higher catalytic selectivity to the hydrogenation of outer aromatic ring and the structure of catalysts could be modified under the specific reaction conditions. Moreover, the selectivity between the isomers of as-octahydrophenanthrene at different reaction time and temperature was analyzed and, based on the results, a hydrogenation mechanism over dispersed Mo-based catalysts was suggested, with monatomic hydrogen transfer and catalytic surface desorption of the half-addition intermediates functioning as the key points. In addition, it is concluded that the catalyst prepared in a lower sulfiding atmosphere was more capable of adsorption than the other one.

关键词： dispersed Mo-based catalysts phenanthrene conversion MoS2 structure product selectivity hydrogenationmechanism

Kuroshio intrusion in the Luzon Strait in an eddy-resolving ocean model and air-sea coupled model

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Acta Oceanologica Sinica 2020年第11期39卷 52-68页

作者： Qian Yang Hailong Liu Pengfei Lin yiwen Li State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China College of Earth Sciences University of Chinese Academy of SciencesBeijing 100049China

The Kuroshio intrusion in a quasi-global eddy-resolving model(LICOMH)and a fully air-sea coupled mode(LICOMHC)was evaluated against *** found that the Kuroshio intrusion was exaggerated in the former,while biases were significantly attenuated in the *** Strait transport(LST)in winter was reduced from–8.8×106 m3/s in LICOMH to–6.0×106 m3/s in *** analysis showed that different LST values could be explained by different large-scale and local surface wind stresses and the eddies east to the Luzon Strait as *** relatively stronger cyclonic eddies in LICOMH northeast of the Luzon Island led to weak Kuroshio transport and strong intrusion through the Luzon *** summed transport of all three factors was approximately 2.0×106 m3/s,which was comparable with the difference in LST between the two *** EKE budget showed that strong EKE transport and the baroclinic transformation term led to strong cyclonic eddies east of the Kuroshio in LICOMH,while surface winds contributed little to the differences in the eddies.

关键词： Kuroshio intrusion South China Sea eddy-resolving model air-sea coupled model

Transformation mechanism and fate of dissolved organic nitrogen(DON) in a full-scale drinking water treatment

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Journal of Environmental Sciences 2022年第11期34卷 122-135页

作者： Yuye Luo Cheng Liu Congcong Li yiwen Shan Tariq Mehmood Key Laboratory of Integrated Regulation and Resource Development on Shallow Lake of Ministry of Education College of EnvironmentHohai UniversityNanjing 210098China College of Environment Hohai UniversityNanjing 210098China

Dissolved organic nitrogen(DON) has attracted much attention in drinking water treatment due to its potential to produce nitrogenous disinfection by-products(N-DBPs). This work was designed to explore the transformation and fate of DON and dissolved inorganic nitrogen(DIN) in drinking water treatment. The changes of DON and formation of N-DBPs were evaluated along the water treatment route(i.e., pre-ozonation and biologicalcontact oxidation, delivery pipes’ transportation, coagulation-sedimentation, sand filtration, post-ozonation, biological activated carbon, ultrafiltration and disinfection) of drinking water treatment plant(DWTP). The transformation mechanism of DON was comprehensively investigated by molecular weight fractionation, three-dimensional fluorescence, LCOCD(Liquid Chromatography-Organic Carbon Detection), total free amino acids. A detailed comparison was made between concentrations and variations of DON and DIN affected by seasons in the drinking water treatment. Regardless of seasonal variation in raw water concentration, the DON removal trends between different treatment processes remain constant in the present study. Compared to other treatment processes, pre-ozonation and coagulation-sedimentation exhibited the dominant DON removal in different seasons, i.e.,11.13%-14.45% and 14.98%-22.49%, respectively. Contrary, biological-contact oxidation and biological activated carbon negatively impacted the DON removal, in which DON increased by 1.76%-6.49% in biological activated carbon. This may be due to the release of soluble microbial products(SMPs) from bacterial metabolism, which was further validated by the rise of biopolymers in LC-OCD.

关键词： Dissolved organic nitrogen Nitrogenous disinfection byproducts Drinking water treatment Soluble microbial products