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SOH Estimation Method for Lithium-ion Batteries Based on Partial Charging Voltage Segments
Xinwei Liu,Kai Lyu,Siwen Chen,Yilong Guo,Shiyou Xing,Di Wang,Jinlei Sun 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
The state of health (SOH) estimation of lithiumion battery is considered a key component of battery management. A SOH estimation method for lithium-ion batteries, which is based on the partial charging voltage segments, is proposed. The voltage data segments was extracted, and the charging time series corresponding to each mv voltage value was reconstructed by interpolation method, which is used as the input of the RNN network. Finally, the estimated SOH value was obtained. The proposed method was applied to CALCE dataset, and accurate estimation result of SOH can be achieved with only 0.1v voltage segment data.
Unveiling Consumer Preferences: A KANO-AHP Analysis of Packaging Demand for Agricultural Products
Xinwei Liu,Xiaoyang Qiao,Qingfeng Zhang 사단법인 한국융합기술연구학회 2024 아시아태평양융합연구교류논문지 Vol.10 No.8
The aim of this study is to deeply understand user needs, and then accurately develop agricultural product packaging that meets market demands. An agricultural product packaging design method based on the Kano-AHP model is proposed to enhance the scientificity of the design and user satisfaction. Basic consumer needs are collected through interviews, and key elements involved in the development of agricultural product packaging, such as vision, function, demand and social responsibility, are clarified. Subsequently, twenty consumer demand factors were summarised and attributes were classified and analysed using the Kano model. Then, the weights of each demand factor were ranked using the Analytic Hierarchy Process (AHP) to determine the relative importance of different attributes on consumer preferences in agricultural packaging design. A comparative analysis of agricultural product packaging design in China and South Korea reveals that there are significant differences between the two countries in the ordering of the importance of packaging design factors. Based on these differences, this study proposes an agricultural product packaging design innovation path for the two countries' markets, which provides a valuable reference for enterprises. By combining the Kano model and the AHP method, it not only makes up for the limitations of the traditional Kano model, but also improves the accuracy of packaging design decision-making by ranking the weights of design elements. It promotes the rationality and scientificity of the packaging design of agricultural products and effectively handles the interaction between consumers and producers. Finally, the validity of the Kano-AHP model and the feasibility of the research results are further verified through cases, which provide a solid theoretical basis and practical guidance for the subsequent development of agricultural packaging design.
刘鑫伟(Xinwei LIU) Korea Institute for Humanities and Social Sciences 2024 Journal of Global Arts Studies (JGAS) Vol.S1 No.-
《时代新风》系列海报是一组公益海报。作品以时代新风的口号作为主视觉符号配合与主题相呼应的图形和颜色,隐喻了时代新风的口号,强化了主题信息。海报运用了书法的形式传达浓厚的中国传统文化和隐喻,也点明了海报主题,现代与传统的融合。
Ultrathin MEMS thermoelectric generator with Bi2Te3/(Pt, Au) multilayers and Sb2Te3 legs
Liu Yang,Mu Erzhen,Wu Zhenhua,Che Zhanxun,Sun Fangyuan,Fu Xuecheng,Wang Fengdan,Wang Xinwei,Hu Zhiyu 나노기술연구협의회 2020 Nano Convergence Vol.7 No.8
Multilayer structure is one of the research focuses of thermoelectric (TE) material in recent years. In this work, n-type 800 nm Bi 2 Te 3 /(Pt, Au) multilayers are designed with p-type Sb 2 Te 3 legs to fabricate ultrathin microelectromechanical systems (MEMS) TE devices. The power factor of the annealed Bi 2 Te 3 /Pt multilayer reaches 46.5 μW cm −1 K −2 at 303 K, which corresponds to more than a 350% enhancement when compared to pristine Bi 2 Te 3 . The annealed Bi 2 Te 3 /Au multilayers have a lower power factor than pristine Bi 2 Te 3 . The power of the device with Sb 2 Te 3 and Bi 2 Te 3 /Pt multilayers measures 20.9 nW at 463 K and the calculated maximum output power reaches 10.5 nW, which is 39.5% higher than the device based on Sb 2 Te 3 and Bi 2 Te 3 , and 96.7% higher than the Sb 2 Te 3 and Bi 2 Te 3 /Au multilayers one. This work can provide an opportunity to improve TE properties by using multilayer structures and novel ultrathin MEMS TE devices in a wide variety of applications.
Stress concentrations around a circular hole in an infinite plate of arbitrary thickness
Longchao Dai,Xinwei Wang,Feng Liu 국제구조공학회 2010 Structural Engineering and Mechanics, An Int'l Jou Vol.34 No.2
This paper presents theoretical solutions for the three-dimensional (3D) stress field in an infinite isotropic elastic plate containing a through-the-thickness circular hole subjected to far-field inplane loads by using Kane and Mindlin’s assumption. The dangerous position, where the premature fracture or failure of the plate will take place, the expressions of the tangential stress at the surface of the hole and the out-of-plane stress constraint factor are found in a concise, explicit form. Based on the present theoretical solutions, a comprehensive analysis is performed on the deviated degree of the in-plane stresses from the related plane stress solutions, stress concentration and out-of-plane constraint, and the emphasis has been placed on the effects of the plate thickness, Poisson’s ratio and the far-field in-plane loads on the stress field. The analytical solution shows that the effects of the plate thickness and Poisson’s ratio on the deviation of the 3D in-plane stress components is obvious and could not be ignored, although their effects on distributions of the in-plane stress components are slight, and that the effect of the farfield in-plane loads is just on the contrary of that of the above two. When only the shear stress is loaded at far field, the stress concentration factor reach its peak value about 8.9% higher than that of the plane stress solutions, and the out-of-plane stress constraint factor can reach 1 at the surface of the hole and is the biggest among all cases considered.
Stress concentrations around a circular hole in an infinite plate of arbitrary thickness
Dai, Longchao,Wang, Xinwei,Liu, Feng Techno-Press 2010 Structural Engineering and Mechanics, An Int'l Jou Vol.34 No.2
This paper presents theoretical solutions for the three-dimensional (3D) stress field in an infinite isotropic elastic plate containing a through-the-thickness circular hole subjected to far-field in-plane loads by using Kane and Mindlin's assumption. The dangerous position, where the premature fracture or failure of the plate will take place, the expressions of the tangential stress at the surface of the hole and the out-of-plane stress constraint factor are found in a concise, explicit form. Based on the present theoretical solutions, a comprehensive analysis is performed on the deviated degree of the in-plane stresses from the related plane stress solutions, stress concentration and out-of-plane constraint, and the emphasis has been placed on the effects of the plate thickness, Poisson's ratio and the far-field in-plane loads on the stress field. The analytical solution shows that the effects of the plate thickness and Poisson's ratio on the deviation of the 3D in-plane stress components is obvious and could not be ignored, although their effects on distributions of the in-plane stress components are slight, and that the effect of the far-field in-plane loads is just on the contrary of that of the above two. When only the shear stress is loaded at far field, the stress concentration factor reach its peak value about 8.9% higher than that of the plane stress solutions, and the out-of-plane stress constraint factor can reach 1 at the surface of the hole and is the biggest among all cases considered.