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222 results on '"Zhu, Chenqi"'

4. Targets in Reinforcement Learning to solve Stackelberg Security Games

Author

Bandyopadhyay, Saptarashmi, Zhu, Chenqi, Daniel, Philip, Morrison, Joshua, Shay, Ethan, and Dickerson, John

Subjects
Computer Science - Machine Learning, Computer Science - Artificial Intelligence, Computer Science - Computer Science and Game Theory, Computer Science - Multiagent Systems, Statistics - Machine Learning
Abstract

Reinforcement Learning (RL) algorithms have been successfully applied to real world situations like illegal smuggling, poaching, deforestation, climate change, airport security, etc. These scenarios can be framed as Stackelberg security games (SSGs) where defenders and attackers compete to control target resources. The algorithm's competency is assessed by which agent is controlling the targets. This review investigates modeling of SSGs in RL with a focus on possible improvements of target representations in RL algorithms., Comment: Appears in Proceedings of AAAI FSS-22 Symposium "Lessons Learned for Autonomous Assessment of Machine Abilities (LLAAMA)"

Published
2022

8. MOCVD growth and characterisation of III-nitride semiconductor materials for monolithically integrated optoelectronics

Author

Zhu, Chenqi, Wang, Tao, and Maiden, Andrew

Abstract

There has been a significantly increasing interest in developing III-nitride semiconductor based micro-light-emitting diodes (µLEDs), the key components for future microdisplay systems such as augmented reality (AR), virtual reality (VR), helmet-mounted displays (HMD) and head-up displays (HUD), which require high brightness, high resolution, and high efficiency. An electronic component that is also an essential part for controlling individual µLEDs is also extremely important. However, the performance of µLEDs fabricated using conventional dry-etching methods is far from enough. The ability to monolithically integrate µLEDs and electronics such as high electron mobility transistors (HEMTs) on a single chip is also of great importance. In this thesis, the epitaxial integration of µLEDs and HEMTs has been demonstrated. Fundamental epitaxial work behind the technology has been conducted with a particular focus on GaN grown on a Si substrate. The growth of GaN on (111) Si substrates is complicated due to a number of fundamental challenges, such as the large lattice mismatch between GaN and silicon and the large difference in the thermal expansion coefficient between GaN and silicon, both leading to a significant amount of tensile strain during the final cooling process, a major reason for wafer cracking. Furthermore, unlike GaN-on-sapphire, GaN-on-Si growth has issues with melt back etching. In this study, the entire process, including the growth mechanism, was investigated in detail. Several new methods were developed. Detailed measurements and analyses were performed to determine the optimal growth conditions. As a result, this study has led to achieving crack-free, high-quality GaN-on-Si crystals that exhibits good surface morphology. Both electronics and photonics were grown and fabricated on high-quality GaN-on-Si. An AlGaN/GaN-based HEMT was grown on GaN-on-Si, where the influence of the strain status of the device on its performance was investigated. An InGaN/GaN multiple quantum well (MQWs) structure was grown on the GaN-on-Si, which exhibited major differences in terms of optical performance compared with InGaN MQWs grown on sapphire under identical conditions. The strain was found to play an important role in these differences. This comparative study provides useful information regarding the growth of InGaN with high indium contents for visible LEDs with longer emission wavelengths. This work also presents a selective epitaxial overgrowth method using pre-patterned micro array templates. The optimisation of this selective overgrowth method resulted in the demonstration of a monolithically integrating µLEDs and HEMTs device onto a single chip. Finally, a prototype of an 8 x 8 microdisplay in which each µLED is controlled by an individual HEMT was demonstrated.

Published
2022

15. Buy Now Pay (Pain?) Later.

Author

deHaan, Ed, Kim, Jungbae, Lourie, Ben, and Zhu, Chenqi

Subjects
CONSUMER credit, CREDIT card fees, BANKING industry, ECONOMIC indicators, CREDIT cards, OVERDRAFTS
Abstract

"Buy-now-pay-later" (BNPL) is a relatively unregulated FinTech innovation that provides consumers with easy access to credit for retail purchases. BNPL spending is projected to reach $1 trillion by 2025, but we know little about its effects. Using banking data for 10.6 million U.S. consumers, we investigate the effects of BNPL on leading indicators of users' financial health. We find that new BNPL users experience rapid increases in bank overdraft charges and credit card interest and fees compared with nonusers, consistent with BNPL facilitating overborrowing. An instrumental variable exploiting consumers' pre-BNPL shopping habits bolsters our inferences. Our results inform regulatory investigations into the effects of BNPL on users' financial health and expand academia's understanding of an important consumer credit innovation. This paper was accepted by Camelia Kuhnen, finance. Funding: E. deHaan acknowledges financial support from Stanford University; B. Lourie and C. Zhu acknowledge financial support from University of California Irvine. Supplemental Material: The online appendix and data files are available at https://doi.org/10.1287/mnsc.2022.03266. [ABSTRACT FROM AUTHOR]

Published
2024
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22. Do Social Connections Mitigate Hold-up and Facilitate Cooperation? Evidence from Supply Chain Relationships.

Author

Dasgupta, Sudipto, Zhang, Kuo, and Zhu, Chenqi

Subjects
SUPPLY chains, INTERORGANIZATIONAL relations, COOPERATION, INTERPERSONAL relations, SUPPLIERS, INVESTMENTS
Abstract

We show that prior social connections can mitigate hold-up in bilateral relationships and encourage relation-specific investment and cooperation when contracts are incomplete. We examine vertical relationships and show that relation-specific innovative activities by suppliers increase with the existence and strength of prior social connections between the suppliers' managers and board members and those of their customers. To establish causality, we exploit connection breaches due to manager/director retirements or deaths and find that innovation drops for affected suppliers after the departure of socially connected individuals relative to unaffected suppliers. Our work sheds light on how social connections can shape firm boundaries. [ABSTRACT FROM AUTHOR]

Published
2021
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32. Optimization of the vancomycin administration regimen by clinical pharmacists based on a population pharmacokinetics model: a prospective interventional study

Author

Lu, Haodi, primary, Duan, Lufen, additional, Yu, Yanxia, additional, Li, Jingjing, additional, Shi, Lu, additional, Xue, Sudong, additional, Zhang, Qian, additional, Zhou, Qin, additional, Zhu, Chenqi, additional, Shang, Erning, additional, Yan, Xinxin, additional, and Tang, Lian, additional

Published
2022
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37. Dose Optimization of Teicoplanin for Critically Ill Patients With Renal Dysfunction and Continuous Renal Replacement Therapy: Experience From a Prospective Interventional Study

Author

Shi, Lu, primary, Zhuang, Zhiwei, additional, Duan, Lufen, additional, Zhu, Chenqi, additional, Xue, Hongzhi, additional, Wang, Xiao, additional, Xu, Xiaowen, additional, Yuan, Yunlong, additional, Shi, Ling, additional, Li, Jiahui, additional, Sun, Jiantong, additional, Liu, Xin, additional, Zhou, Qin, additional, Lu, Jian, additional, and Tang, Lian, additional

Published
2022
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38. A Regression Model to Predict Linezolid Induced Thrombocytopenia in Neonatal Sepsis Patients: A Ten-Year Retrospective Cohort Study

Author

Duan, Lufen, primary, Zhou, Qin, additional, Feng, Zongtai, additional, Zhu, Chenqi, additional, Cai, Yan, additional, Wang, Sannan, additional, Zhu, Meiying, additional, Li, Jingjing, additional, Yuan, Yunlong, additional, Liu, Xin, additional, Sun, Jiantong, additional, Yang, Zuming, additional, and Tang, Lian, additional

Published
2022
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43. Additional file 1 of Acupoint nanocomposite hydrogel for simulation of acupuncture and targeted delivery of triptolide against rheumatoid arthritis

Author

Ren, Shujing, Liu, Heng, Wang, Xitong, Bi, Jiquan, Lu, Shengfeng, Zhu, Chenqi, Li, Huizhu, Kong, Wenliang, Chen, Rui, and Chen, Zhipeng

Subjects
body regions, embryonic structures, technology, industry, and agriculture
Abstract

Additional file 1: Table S1. Pharmacokinetic of TP in different groups. Table S2. Histopathological scores. Figure S1. Molecular weight and purity verification of FEFQFK sequence. Figure S2. SEM of TP@HSA NPs. Figure S3. FTIR spectra of HSA, TP, the mixture of HSA and TP, and TP@HSA NPs. FigureS4. Study on the stability of TP@HSA NPs. Figure S5. Comparative of the release behavior of CCPA and TP from nanocomposite hydrogel in different pH. Figure S6. Histopathological images obtained by H&E staining. Figure S7. Imaging of AIA mice treated with TP@HSA NPs in ST36 in left site at different point-in-times. Figure S8. Representative micro-CT images of the ankle joints at day 28.

Published
2021
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