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Showing results [2064 - 2083] / 3437
  • Authors: Felix, Mohr; Marcel, Wever;  Advisor: -;  Co-Author: - (2023)

    An essential task of automated machine learning (AutoML ) is the problem of automatically finding the pipeline with the best generalization performance on a given dataset. This problem has been addressed with sophisticated black-box optimization techniques such as Bayesian optimization, grammar-based genetic algorithms, and tree search algorithms. Most of the current approaches are motivated by the assumption that optimizing the components of a pipeline in isolation may yield sub-optimal results. We present Naive AutoML , an approach that precisely realizes such an in-isolation optimization of the different components of a pre-defined pipeline scheme.
  • Authors: Chen, Chen;  Advisor: -;  Co-Author: - (2023)

    This study proposes that naming a firm eponymously is a mechanism that small private firms can use to signal their superior financial performance and commitment to fulfill debt contract obligations. Using 621,614 small private firms in Europe over the period 2008–2018, we find that small private eponymous firms pay significantly lower interest on their debts and have more long-term debt than non-eponymous firms. Our findings are robust to various controls and placebo tests. Additional analyses show that eponymy lowers the cost of debt and facilitates long-term debt via reputation signaling and private information. We also document that the effect of eponymy on debt contracting is most...
  • Authors: Sa, Thị Hạnh;  Advisor: Diêm, Thị Thanh Hải;  Co-Author: - (2020)

    Phân tích và đánh giá thực trạng tuyển dụng nhân lực tại Công Ty Cổ Phần Tập Đoàn Phượng Hoàng Xanh A&A, làm rõ những ưu nhược điểm của công tác tuyển dụng để từ đó đưa ra những kiến nghị, giải pháp nhằm hoàn thiện công tác tuyển dụng nhân sự của công ty. Đề xuất định hướng và một số giải pháp cụ thể nhằm hoàn thiện công tác tuyển dụng nhân lực tại Công Ty Cổ Phần Tập Đoàn Phượng Hoàng Xanh A&A.
  • Authors: Wang, Zhong Lin;  Advisor: -;  Co-Author: - (2023)

    Nanogenerators is a field that uses the piezoelectric and/or triboelectric effect for converting low-grade mechanical energy (termed as high-entropy energy) into electric power, with a great potential for applications in the Internet of Things, self-powered sensors, robotics, medical science, and even artificial intelligence. Piezotronics is a field that utilizes the piezoelectric polarization in third-generation semiconductors for controlling the charge-carrier transport in semiconductor devices. These two fields were first coined by Wang’s group in 2006 and 2007, respectively. This article reviews the background and initial ideas based on which we introduced the following original d...
  • Authors: Linlin, Duan; Jian, Li; Haitao, Duan;  Advisor: -;  Co-Author: - (2023)

    Friction and wear are ubiquitous, from nano-electro-mechanical systems in biomedicine to large-scale integrated electric propulsion in aircraft carriers. Applications of nanomaterials as lubricating oil additives have achieved great advances, which are of great significance to control friction and wear. This review focuses on the applications of nanomaterials in lubricating oil and comprehensively compares their tribological characteristics as lubricating oil additives. Statistical analysis of tribology data is provided and discussed accordingly; moreover, the interaction between nanomaterials and sliding surface, lubricating oil, other additives, and synergistic lubrication in nanoco...
  • Authors: Le, Tien-Thinh;  Advisor: Le, Minh Vuong;  Co-Author: - (2021)

    This paper investigates the nanoscale effect on the effective bulk modulus of nanoparticle-reinforced polymer. An interface-based model is introduced in this work to study the nanoscale effects on the effective properties of heterogeneous materials. That interface model is able to capture discontinuity of mechanical fields across the surface between the nanoparticle and matrix. A generalized self-consistent scheme is then employed to determine the effective bulk modulus. It has been seen from the results that, in a certain range of limits, the influence of nanoscale effects on effective properties of heterogeneous materials is significant and needs to be taken into account. In particu...
  • Authors: Abdullah H. Alshehri; Jhi Yong Loke; Viet Huong Nguyen; Alexander Jones; Hatameh Asgarimoghaddam; Louis-Vincent Delumeau; Ahmed Shahin; Khaled H. Ibrahim; Kissan Mistry; Mustafa Yavuz; David Muñoz-Rojas; Kevin P. Musselman;  Advisor: -;  Co-Author: - (2021)

    Nanoscale films are integral to all modern electronics. To optimize device performance, researchers vary the film thickness by making batches of devices, which is time-consuming and produces experimental artifacts. Thin films with nanoscale thickness gradients that are rapidly deposited in open air for combinatorial and high-throughput (CHT) studies are presented. Atmospheric pressure spatial atomic layer deposition reactor heads are used to produce spatially varying chemical vapor deposition rates on the order of angstroms per second. ZnO and Al2O3 films are printed with nm-scale thickness gradients in as little as 45 s and CHT analysis of a metal-insulator-metal diode and perovskite...