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Zixu Guo,Ziyuan Song,Dawei Huang,Xiaojun Yan 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.12
In this study, in the respect of rafting behavior of Ni-based single crystal (SC) superalloy under creep and thermal mechanicalfatigue (TMF), an image processing program is developed to investigate the probability characteristic of γ channel width, anda channel width evolution model considering non-quasi-static modification is proposed. Firstly, the fractured and interruptedtests are conducted on SC superalloy. The channel width evolution behavior under different load conditions is observed viascanning electron microscope. Then, an image processing program based on image binarization is developed to conductstatistics on channel width. The statistical results show that the stress and temperature have significant effects on raftingrate, while the phase difference has a small effect. Meanwhile, the channel width obeys lognormal distribution, and the meanvalues follow linear relationship with standard deviations. In the modeling part, a static model is established to predict themean value evolution of channel width under creep condition. To be generalized to TMF condition, the model is modifiedby considering the non-quasi-static effect. After that, the channel width evolution model is further derived to describe theprobability density distribution of channel width. The predicted channel width evolutions are in good agreement with theexperimental results. The statistical results and models can provide the basis for multiscale modeling of SC superalloy.
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Jia Long,Zixu Miao,Huihuang Chen,Rongdong Deng,Weiran Zuo,Bao Guo,Jiangang Ku 한국자기학회 2020 Journal of Magnetics Vol.25 No.1
Chain-like and diamond-shaped magnetic particle agglomeration (MPA) commonly forming in a weak magnetic field are simulated based on the finite element method (FEM), and the effects of particle diameter, magnetic field strength, particle relative magnetic permeability, and particle number in magnetic particle chains (MPCs) and diamond-shaped MPA on the strength of MPA are analysed in detail. The results show that magnetic forces on the centre contact points (CCPs) of MPA are positively correlated with the particle diameter, magnetic field strength, particle relative magnetic permeability, and particle number. In addition, the forces on the CCPs of the MPCs (N=2) have a square relationship with the particle diameter and magnetic field strength and have a power relationship of 1.25 with the particle relative magnetic permeability. The forces on each contact point decrease slowly from the centre to both ends in the MPCs and then rapidly decrease to one value (approximately 0.779 times the forces on the CCPs). As for the diamond-shaped MPA, with the increase in the angle α between the magnetic field and axis of diamond-shaped MPA, the force magnitude of the particle entrained parallelly in the diamond-shaped MPA shows a trend of a “cosine curve” shape and the minimum value is 2109 times that of the entrained particle’s gravity. The angle θ between the direction of the force and the negative X-axis shows a trend of a “sine curve” shape. When α = 25° and 155°, the angle θ of the force on the entrained particle reaches an extreme value, that is, θ = 21.87°. Only if the angle θ reaches 30º can the particle entrained parallelly escape from the diamond-shaped MPA. Thus, the diamond-shaped MPA remains in a stable state and it is difficult to disperse MPA by changing the direction of the magnetic field.
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Mianxiong Dong,Kaoru Ota,Feilong Tang,Minyi Guo,Zixue Cheng 보안공학연구지원센터 2008 International Journal of Smart Home Vol.2 No.3
With the rapid progress on the Internet Technology, many projects have been proposed in terms of remote education system such as WBT (Web-Based Training) and E-learning. Such systems can help learners for studying by themselves based on their own learning history in a virtual world. However, learners usually spend time in the real world during studying, exercising, and the other activities. It seems the systems do not give enough support to learners in the real world. Ubiquitous technologies make it possible to provide services to learners anytime and anywhere in the real world. It means learners can receive more meticulous, individually-targeted support in ubiquitous environments. In this paper, we propose a ubiquitous environment to support college students, professors, and visitors in a laboratory to encourage positive research activities. Actions of people in the Ubiquitous Laboratory (U-Lab) are individually recorded by sensor networks and analyzed to provide suitable supports. Based on these collected information, U-Lab provides services such as to grasp a precise research progress and share research information among students and professors. We also propose a method to advise students to improve their research activities.
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Assist Your Study at Home: Design, Implementation and Evaluation of the ULS System
Mianxiong Dong,Kaoru Ota,Feilong Tang,Minyi Guo,Zixue Cheng 보안공학연구지원센터 2008 International Journal of Smart Home Vol.2 No.1
With the great progress of technologies, computers are embedded into everywhere to make our daily life convenient, efficient and comfortable. Further more, most of them are small, powerful, intelligent and invisible. In a ubiquitous computing environment, support methods for learning are more effective than some traditional ways, such as WBT (Web-Based Training) and e-learning. In this paper, we proposed a support method which aims to encourage a learner to acquire his/her learning habit based on Behavior Analysis. The supports to the learner are provided through a scheduler system, a Ubiquitous Learning Scheduler (ULS). In our design, the learner’s situations are collected by sensors and analyzed by comparing them to his/her learning histories. Based on this information, supports are provided to the learner in order to help him/her forming a good learning style. Our Research results revealed that ULS not only benefited learners to acquire their learning habits but also improved their self-directed learning styles.
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