Results 61 to 70 of about 810,264 (301)

Optimal Portfolio Selection in the Stock Exchange: An Application of Value at Risk (VaR) Index [PDF]

فصلنامه پژوهش‌های اقتصادی ایران, 2007
The main objective of this paper is to determine the optimum portfolio of the Tehran Stock Exchange with respect to the Value at Risk (VaR) index. Daily data are on the shares of 30 active companies traded in the Tehran Stock Exchange with daily expected
Javad Torkamani, Ali Hosseini
doaj  

Portfolio Optimization with a Mean–Absolute Deviation–Entropy Multi-Objective Model

Entropy, 2021
Investors wish to obtain the best trade-off between the return and risk. In portfolio optimization, the mean-absolute deviation model has been used to achieve the target rate of return and minimize the risk.
Weng Siew Lam, Weng Hoe Lam, Saiful Hafizah Jaaman   +2 more
doaj   +1 more source

Rapid Fabrication of Self‐Propelled and Steerable Magnetic Microcatheters for Precision Medicine

Advanced Materials, EarlyView.
A rapid Joule heating fabrication method for the production of self‐propelling, adaptive microcatheters, with tunable stiffness and integrated microfluidic channels is presented. Demonstrated through three microrobotic designs, including a steerable guiding catheter, an untethered wave‐crawling TubeBot, and a distal‐end propelled microcatheter, it was ...
Zhi Chen, Boris Rivkin, David Castellanos‐Robles, Ivan Soldatov, Lukas Beyer, Mariana Medina‐Sánchez   +5 more
wiley   +1 more source

Determining an optimal capital structure and its impact on financial performance. Insight from the firms listed on the New York Stock Exchange

Cogent Economics & Finance
An efficient capital structure is crucial for balancing risk and return, enhancing financial stability, and maximizing profitability. Although prior studies have explored the link between capital structure and firm performance, the effects of specific ...
Richard Arhinful, Halkawt Ismail Mohammed Amin, Leviticus Mensah, Bright Akwesi Gyamfi, Hayford Asare Obeng   +4 more
doaj   +1 more source

Data‐Driven Discovery of Quaternary Ammonium Interlayers for Efficient and Thermally Stable Perovskite Solar Cells

Advanced Materials, EarlyView.
An active learning framework, grounded in independently generated in‐house experimental data, enables reliable discovery of high‐performance interfacial materials for perovskite solar cells. Iterative model refinement autonomously converges toward structurally robust quaternary ammonium architectures, establishing a new design principle for interfacial
Jongbeom Kim, Yang Jeong Park, Chaehoon Jeon, Nahye Shin, Jaewang Park, Seungun Lee, Jino Im, Sungroh Yoon, Sang Il Seok   +8 more
wiley   +1 more source

End‐to‐End Sensing Systems for Breast Cancer: From Wearables for Early Detection to Lab‐Based Diagnosis Chips

Advanced Materials Technologies, EarlyView.
This review explores advances in wearable and lab‐on‐chip technologies for breast cancer detection. Covering tactile, thermal, ultrasound, microwave, electrical impedance tomography, electrochemical, microelectromechanical, and optical systems, it highlights innovations in flexible electronics, nanomaterials, and machine learning.
Neshika Wijewardhane, Lyn I. Jones, Richard M. Martin, Helen Winter, Faezeh Arab Hassani   +4 more
wiley   +1 more source

Comparing Entropy and Beta as Measures of Risk in Asset Pricing

Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 2017
The paper establishes entropy as a measure of risk in asset pricing models by comparing its explanatory power with that of classic capital asset pricing model’s beta to describe the diversity in expected risk premiums.
Galina Deeva
doaj   +1 more source

Hierarchical Multi‐Material Architectures With Gradient Design for Dynamic‐Range Flexible Tactile Sensing

Advanced Materials Technologies, EarlyView.
Hierarchical multi‐material TPMS lattices are engineered as flexible tactile sensors by combining soft and stiff elastomeric layers with a conformal conductive coating. The bilayer architecture delivers sensitivity at low pressures while maintaining a broad detectable range under large loads, enabling reliable pressure and vibration monitoring for ...
Reza Noroozi, Domenic Quiquero, Yan Yan Shery Huang, HaoTian Harvey Shi   +3 more
wiley   +1 more source

Investigating the Effect of Firms’ Bankruptcy Risk and Stock Returns’ Systematic and Idiosyncratic Volatilities on Cash Holding [PDF]

بررسی‌های حسابداری و حسابرسی, 2015
The managers have different incentives to keep cash in firms. One of their incentives for cash holding is precautionary motives. Based on precautionary motives, and to deal with unexpected financial crisis and the subsequent uncertainties, firms always ...
Abbas Aflatooni
doaj   +1 more source