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Coordinating an Extended Warranty Supply Chain under Increasing,Constant and Decreasing Product Failure Rates

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Journal of Systems Science and Systems Engineering 2020年第5期29卷 609-628页

作者： Yuwen Chen jin qin Tongdan jin Yating Chen School of Management University of Science and Technology of ChinaHefei 230026China Department of Information Systems City University of Hong KongKowloon 999077Hong KongChina Ingram School of Engineering Texas State UniversitySan Marcos TX78666USA

A product typically exhibits three different failure rates across its lifetime:increasing,decreasing,or *** paper studies how the characteristics of failure rate impact the supply chain coordination for an extended warranty program involving a manufacturer and a retailer.A two-stage Stackelberg game is utilized to model the interaction between these two *** extended warranty channel structures are compared depending on whether the manufacturer or the retailer offers the warranty *** analysis shows that the failure rate trend during the warranty period has different effects on the coordination of the service supply *** a product has an increasing or constant failure rate,the optimal length of extended warranty offered by the retailer is longer than that of the manufacturer,while the optimal length is shorter for a product with a decreasing failure *** a product during the warranty coverage has an increasing or constant failure rate,a longer extended warranty period will motivate customers to buy the product without the warranty,whereas more customers will buy both the product and the warranty if the product experiences a decreasing failure *** is concluded that,if the manufacturer and the retailer incur the same warranty service cost,the total profit in the supply chain is higher when the manufacturer offers the extended *** the game participants'perspective,the one which sells the extended warranty will obtain more profit.

关键词： Supply chain coordination extended warranty failure rate warranty policy game theory

A Simplified Parallel Two-Level Iterative Method for Simulation of Incompressible Navier-Stokes Equations

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Advances in Applied Mathematics and Mechanics 2015年第6期7卷 715-735页

作者： Yueqiang Shang jin qin School of Mathematics and Statistics Southwest UniversityChongqing 400715China School of Mathematics and Computer Science Zunyi Normal CollegeZunyi 563002China

Based on two-grid discretization,a simplified parallel iterative finite element method for the simulation of incompressible Navier-Stokes equations is developed and *** method is based on a fixed point iteration for the equations on a coarse grid,where a Stokes problem is solved at each ***,on overlapped local fine grids,corrections are calculated in parallel by solving an Oseen problem in which the fixed convection is given by the coarse grid *** bounds of the approximate solution are *** results on examples of known analytical solutions,lid-driven cavity flow and backward-facing step flow are also given to demonstrate the effectiveness of the method.

关键词： Navier-Stokes equations finite element two-level method parallel algorithm

Economic Effects of Drought on Agriculture in North China

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International Journal of Disaster Risk Science 2013年第2期4卷 59-67页

作者： Yingzhi Lin Xiangzheng Deng qin jin School of Mathematics and Physics China University of Geosciences(Wuhan)Wuhan 430074China Center for Chinese Agricultural Policy Chinese Academy of SciencesBeijing 100101China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China

In the past three decades, global agriculture losses have continuously grown due to increasingly severe droughts. Compared with direct economic effects, there are great difficulties in evaluating the indirect economic effects of drought, which has severely lagged behind the urgent information needs for decision making. This study tries to solve the perplexity in the evaluation of the effects of drought on the price fluctuation of agricultural products by building a partial equilibrium model that describes the balancing process of supply and demand quantitatively. Using this model, a scenario analysis is applied to evaluate the price fluctuation of agricultural products caused by drought in North China. The results indicate that there is no major impact of drought on the market prices of eight major agricultural products. Even with the occurrence of a severe drought in North China, market prices of agricultural products will rise no more than 3.59 percent, which is less than the normal market price fluctuations of China’s agricultural products. This study provides a tool for evaluating indirect economic effects of drought. The results of our case study could support decision making for China’s food market regulation.

关键词： drought agricultural evaluating

A metal nitride interlayer for long life lithium sulfur batteries

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Journal of Energy Chemistry 2019年第2期28卷 1-2页

作者： jin-Lei qin Huiyou Zhao Jia-Qi Huang Department of Materials Science and Engineering China University of Mining and Technology (Beijing) Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology CAS Key Laboratory of Carbon Materials Institute of Coal ChemistryChinese Academy of Sciences

With the growing concerns on global energy crisis and the greenhouse effect,the exploration on renewable energy and related emerging energy conversion and storage technologies are highly interested [1].Lithium sulfur (Li–S) battery system receives great attention for its high theoretical specific energy(2600 Wh/kg),which is deemed to be a promising candidate as next generation high energy density batteries [2].

关键词： Shuttle of polysulfides Interlayers Layered double hydroxides Composite separators Lithium sulfur batteries

A Naive Particle Swarm Algorithm for Constrained Optimization Problems

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A Naive Particle Swarm Algorithm for Constrained Optimizatio...

Multimodal Pretraining from Monolingual to Multilingual

第25届中国控制与决策会议

作者： jin qin Benliang Xie College of Computer Science & Information Guizhou University College of Science Guizhou University

ISBN: (纸本)9781467355322

In this paper, a naive particle swarm algorithm for constrained optimization problems is proposed. Also, a direct constraint handling method is adopted, which is more direct and easier to be implemented in comparison with other constraint handling methods, such as penalty function, etc. The experimental results on benchmark problems show that the proposed algorithm can solve constrained optimization problems effectively and has a robust performance.

关键词： Particle Swarm Optimization Constrained Optimization Problem Constraint Handling Penalty Function

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Machine Intelligence Research 2023年第2期20卷 220-232页

作者： Liang Zhang Ludan Ruan Anwen Hu qin jin School of Information Renmin University of ChinaBeijing 100872China

Multimodal pretraining has made convincing achievements in various downstream tasks in recent ***,since the majority of the existing works construct models based on English,their applications are limited by *** this work,we address this issue by developing models with multimodal and multilingual *** explore two types of methods to extend multimodal pretraining model from monolingual to ***,we propose a pretraining-based model named multilingual multimodal pretraining(MLMM),and two generalization-based models named multilingual CLIP(M-CLIP)and multilingual acquisition(MLA).In addition,we further extend the generalization-based models to incorporate the audio modality and develop the multilingual CLIP for vision,language,and audio(CLIP4VLA).Our models achieve state-of-the-art performances on multilingual vision-text retrieval,visual question answering,and image captioning *** on the experimental results,we discuss the pros and cons of the two types of models and their potential practical applications.

关键词： Multilingual pretraining multimodal pretraining cross-lingual transfer multilingual generation cross-modal retrieval

Immunosensor Based on Surface Plasmon Resonance for Antigen Recognition

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Chemical Research in Chinese Universities 2008年第1期24卷 24-28页

作者： jin Wei MU Ying ZOU Xiang-yu jin qin-han Research Center for Analytical Instrumentation College of Information Science and Engineering Zhejiang University Hangzhou 310058 P. R. China College of Instrumentation and Electrical Engineering Jilin University Changchun 130021 P. R. China College of Chemistry Jilin University Changchun 130021 P. R. China

A novel immunosensor based on surface plasmon resonance（SPR） has been developed for the recognition of antigen. The sensor was designed on the basis of the fixed angle of incidence and measuring the reflected intensities in a wavelength range of 430--750 nm in real-time. An ultra-bright white light-emitting diode（LED） was used as the light source. Molecular self-assembling in solution was used to form the sensing membrane on gold substrate. It has been seen that the sensitivity of the SPR sensor with 3-mercaptopropionic acid（MPA）/protein A（SPA） sensing membrane is considerably higher than that with MPA or SPA modified sensing membrane. The kinetic processes on the sensing membrane were studied. The human B factor（Bf）, an activator of complement 3（C3）, was recognized among the other antigens. This sensor can also be used for other antigen/antibody or adaptor/receptor recognition. Under optimized experimental conditions, the sensor has good selectivity, repeatability, and reversibility.

关键词： Surface plasmon resonance Immunosensor Molecular recognition

Simple, Selective, and Sensitive Spectrophotometric Method for Determination of Trace Amounts of Nickel(Ⅱ), Copper (Ⅱ), Cobalt (Ⅱ), and Iron (Ⅲ) with a Novel Reagent 2-Pyridine Carboxaldehyde Isonicotinyl Hydrazone

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Chemical Research in Chinese Universities 2008年第2期24卷 143-147页

作者： Sajid H. Guzar jin qin-han Institute of Miniature Analytical Instrumentation College of Chemistry Jilin University Changchun 130021 P. R. China Research Center of Instrumentation Zhejiang University Hangzhou 310058 P. R. China

A selective and sensitive reagent of 2-pyridine carboxaldehyde isonicotinyl hydrazone（2-PYAINH） was synthesized and studied for the spectrophotometric determination of nickel, copper, cobalt, and iron in detail. At a pH value of 7.0, 9,0, 9.0, and 8.0, respectively, which greatly increased the selectivity; nickel, copper, cobalt, and iron reacted with 2-PYAINH to form a 1：2 yellow-orange, 1：2 yellow-green, 1：2 yellow and 1：1 yellow complexes, with absorption peaks at 363, 352, 346, and 359 nm, respectively. Under the optimal conditions, Beer＇s law was obeyed over the ranges of 0.01-1.4, 0.01-1.5, 0.01-2.7, and 0.01-5.4 mg/L respectively. The apparent molar absorptivity and Sandell＇s sensitivities were 8.4×10^4, 5.2×10^4, 7.1×10^4, and 3.9×10^4 L·mol^-l·cm^-1, respectively, and 0.00069, 0.0012, 0.00078, and 0.0014 μg·cm2, respectively. The detection limits were found to be 0.001, 0.002, 0.003, and 0.01 mg/L, respectively. The detailed study of various interfering ions to make the method more sensitive was carried out and selective and several real samples were analyzed with satisfactory results.

关键词： Copper(Ⅱ) Nickel(Ⅱ) Cobalt(Ⅱ) Iron(Ⅲ) 2-Pyridine carboxaldehyde isonicotinyl hydrazone(2-PYAINH) Spectrophotometry

Testing for Serial Correlation in Three-dimensional Panel Data Models

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Acta Mathematicae Applicatae Sinica 2017年第1期33卷 239-250页

作者： Jian-hong WU qing DING jin-xu qin College of Mathematics and Science Shanghai Normal University Shanghai 200234 China

This paper studies serial correlation testing for a general three-dimensional panel data model. As a step for hypothesis testing, the robust within estimation of parameter coefficients is investigated, and shown to asymptotically consistent and normal under some mild conditions. A residual-based statistic is then constructed to test for serial correlation in the idiosyncratic errors, which is based on the parameter estimates for an artificial autoregression modeled by centering and differencing residuals. The test can be shown to asymptotically chisquare distributed under the null hypothesis. Power study shows that the test can detect local alternatives distinct at the parametric rate from the null hypothesis. The test needs no distribution assumptions of the error components, and is robust to the misspecification of various specific effects. Monte Carlo simulations are carried out for illustration.

关键词： three-dimensional panel data serial correlation residual-based test