Chih-Yun Chen | Searcharxiv

arXiv2022

Compact Scintillator Array Detector (ComSAD) for sounding rocket and CubeSat missions

The development of CubeSat and more frequent launch chances of sounding rockets are a total game changer to the space program, and it allows us to build space instruments to be more achievable and affordable. Therefore, it gives us a good opportunity to build a small cosmic ray detector which has capabilities to measure the flux, direction, and even energy of cosmic rays at the height above the limitation of balloon experiments, and it may open a new door for building a constellation of detectors to study cosmic ray physics. Compact Scintillator Array Detector (ComSAD) is dedicated for the sounding rocket mission of Taiwan's National Space Organization. In paper, we present the idea, design, and performance of ComSAD which is also suitable for CubeSat missions in the future.

physics.ins-det↗

arXiv2020

ColdGAN: Resolving Cold Start User Recommendation by using Generative Adversarial Networks

Mitigating the new user cold-start problem has been critical in the recommendation system for online service providers to influence user experience in decision making which can ultimately affect the intention of users to use a particular service. Previous studies leveraged various side information from users and items; however, it may be impractical due to privacy concerns. In this paper, we present ColdGAN, an end-to-end GAN based model with no use of side information to resolve this problem. The main idea of the proposed model is to train a network that learns the rating distributions of experienced users given their cold-start distributions. We further design a time-based function to restore the preferences of users to cold-start states. With extensive experiments on two real-world datasets, the results show that our proposed method achieves significantly improved performance compared with the state-of-the-art recommenders.

cs.AI↗