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Yeonji Kim,Kyungyeon Lee,Uran Oh 한국인터넷방송통신학회 2020 Journal of Advanced Smart Convergence Vol.9 No.2
It is difficult for non-experts to build machine learning (ML) models at the level that satisfies their needs. Deep learning models are even more challenging because it is unclear how to improve the model, and a trial-and-error approach is not feasible since training these models are time-consuming. To assist these novice users, we examined how interactive and explainable feedback while training a deep learning network can contribute to model performance and users’ satisfaction, focusing on the data preparation process. We conducted a user study with 31 participants without expertise, where they were asked to improve the accuracy of a deep learning model, varying feedback conditions. While no significant performance gain was observed, we identified potential barriers during the process and found that interactive and explainable feedback provide complementary benefits for improving users’ understanding of ML. We conclude with implications for designing an interface for building ML models for novice users.
Secular Variation from Multipolar Planetary Dynamo
Yeonji Lee,Yongjae Yu 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10
Magnetic field of Earth, Jupiter, and Saturn is a combination of a predominant dipolar component and minor multipolar components. While the quadrupolar contribution is independent of latitudinal variation, the dipolar and octupolar components are strongly dependent on the latitude. It is apparent that dispersion at low latitudes originates from the quadrupolar contribution. On the other hand, dispersion at high latitudes is governed by dipolar contribution. The offset between the observed and predicted dispersion of secular variation is confined within 1.1° at all latitudes. To estimate the effect of non-dipolar contribution in magnetic secular variation, quadrupolar contribution (5%, 10%) and octupolar contribution (5%, 10%, 15%, 20%) are considered. We found that the magnetic inclination is lowered with increasing quadrupolar contribution. A similar trend of lowered magnetic inclination is also observed with increasing octupolar contribution. The offset yields consistently negative values, indicating magnetic inclination is underestimated. It should be highlighted that the offset in magnetic inclination reached to a maximum value of 15° at colatitude of 60° for octupolar dynamo.