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Web Tension Estimation by Local Contact Force Measurement in Roll-to-Roll Manufacturing
Yiwei Jin,Jiankui Chen,Zhouping Yin 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.11
Web tension and its distribution are key factors in the operation of web systems, the roll to roll (R2R) manufacturing of flexible electronics brings even higher requirements for it. To effectively get the web tension at any position on the R2R process line, a new web tension estimation method by measuring the local contact force is investigated in this paper, which can not only estimate the web tension, but also the web tension distribution. This study attempts to derive the approximate fitting formula between the local contact force and the web tension. Firstly, the schematic of web tension estimation method by local contact force measurement is presented; Then the mass spring model is used to derive the governing equations, which is discretized and solved by Improved Euler method. And approximate fitting formula of the local contact force with tension is derived based on the numerical results. Finally, to validate the fitting formula, the experiments are carried out to detect the local contact force and estimate both the web tension and its distribution.
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An Analysis of the Problems and Causes of the Formation of Multicultural Families in Korea 2010-2020
Heejung Seo-Reich(Heejung Seo-Reich ),Sun Yiwei(Yiwei Sun),Yu Yinxia(Yinxia Yu),Jin Liuxi(Liuxi Jin),Wang Dehui(Dehui Wang) 영남퇴계학연구원 2022 The Journal of Toegye Studies Vol.5 No.2
This article aims to examine the status of multicultural families in Korea from 2010 to 2020, while analyzing their problems and reasons from a multi-layered perspective, to provide an academic foundation for reference in supporting a social safety system for the stable settlement of those families. Although foreign immigrants experience a certain acceptance due to economic necessity, this attitude is often only a conditional and partial acceptance that does not consider migrants as full members of the community and, moreover, sometimes even suspects them of promoting social division through their presence. This study comprehensively analyzes the current status, problems, and causes of problems in multicultural families in Korea through related data between 2010 and 2020. The problems of multicultural families are manifested mainly in economic, cultural and social terms, and each of these problems is organically interconnected. International marriages between Korean men and female immigrants from developing countries are facing a special set of issues such as unequal status of the spouses or specific problems in child’s education. These problems are serious in the sense that they are not only a temporary burden for the multicultural families, but can also affect future generations, the chances of their development and their inclusion in society. Analysis of these problems, which lie in factors of the social environment and cultural differences, can serve as a basis for countermeasures that will benefit multicultural families in Korea. The problems of multinational families must be understood and addressed in their intertwined complexity in order to find solutions that benefit not only these families, but ultimately society as a whole.
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Hui Guo,Xingjie Peng,Yiwei Wu,Xin Jin,Kuaiyuan Feng,Hanyang Gu 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.3
The small modular liquid-metal fast reactor (SMFR) is an important component of advanced nuclearsystems. SMFRs exhibit relatively low breeding capability and constraint space for control rod installation. Consequently, control rods are deeply inserted at beginning and are withdrawn gradually tocompensate for large burnup reactivity loss in a long lifetime. This paper is committed to investigatingthe impact of control rod compensation operation on core neutronics characteristics. This paper presentsa whole core fine depletion model of long lifetime SMFR using OpenMC and the influence of depletionchains is verified. Three control rod position schemes to simulate the compensation process arecompared. The results show that the fine simulation of the control rod compensation process impactssignificantly the fuel burnup distribution and absorber consumption. A control rod equivalent positionscheme proposed in this work is an optimal option in the trade-off between computation time andaccuracy. The control position is crucial for accurate power distribution and void feedback coefficients inSMFRs. The results in this paper also show that the pin level power distribution is important due to theheterogeneous distribution in SMFRs. The fuel burnup distribution at the end of core life impacts theworth of control rods.
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