In this paper, we analyse co-movements and correlations between Bitcoin thirty-one of the most-tradable crypto assets using high-frequency data for period from January 2019 to December 2020. We apply Diagonal-BEKK model pre-COVID COVID-19 periods, identify significant changes in patterns during pandemic period. also employ Minimum Spanning Tree (MST) Planar Maximally Filtered Graph (PMFG) metho...

electronic government is a new concept that governments according to level of development implement in different ways. utilizing informational systems in business sections has created potential context for developing electronic government. customer relationship ‎management (crm) is an important system in management that helps to develop electronic government and promote citizenship-based in org...

Þrátt fyrir fjölda svefnrannsókna á undanförnum árum er enn margt huldu um útbreiðslu svefnvenja meðal ungmenna. Nægur nætursvefn mikilvægur þroska, heilsu og námsgetu ungs fólks. Markmið rannsóknarinnar var að skoða hvort svefnlengd íslenskra skólanema samræmdist svefnráðleggingum, hver meðalsvefnlengd nemendanna væri munur tíðni ráðlagðs svefns milli einstakra hópa nemenda.Landskönnunin „Heil...

a semi-micromechanical multilaminate model is introduced here to predict the mechanical behavior of soils. this model is like a bridge between micro and macro scale upon the satisfaction of minimum potential energy level during any applied stress/strain increments. the concept of this model is based on a certain number of sampling planes which constitute the elastic-plastic behavior of the soil...

This study investigates return and asymmetric volatility spillovers dynamic correlations between the main small medium-sized enterprise (SME) stock markets in Saudi Arabia Egypt for periods before during COVID-19 pandemic. Return are modelled using a VAR-asymmetric BEKK–GARCH (1,1) model, while DCC–GARCH model is employed to conditional these markets, which then used determine explore portfolio...

Robust Estimation in Nonlinear Modeling of Volatility Transmission in Stock Market S.B. Ebrahimi * Department of Industrial Engineering, K.N.Toosi University of Technology, Tehran, Iran * Email: [email protected] (Received: 12 September 2015; Revised: 8 May 2016; Accepted: 24 June 2016) Volatility transmission means the connection between different markets in a way that volatility can be tr...

This paper investigates co-movements among the Chinese stock market, Shanghai International Energy Exchange (INE) crude oil futures and West Texas Intermediate (WTI) futures. We use Copula models to capture tail dependencies employ VAR-BEKK-GARCH model examine direction of volatility spillovers. find that there are positively time-varying dependency relationships three markets. Compared with co...

This paper proposes a bi-objective model for the facility location problem under a congestion system. The idea of the model is motivated by applications of locating servers in bank automated teller machines (ATMS), communication networks, and so on. This model can be specifically considered for situations in which fixed service facilities are congested by stochastic demand within queueing frame...

index tracking is the process of developing a portfolio that reproduces the performance of an index. the tracker portfolio has relatively good diversity and low turnover and low transaction costs. in this paper we applied a binary programming model for index tracking problem. in this model the number of assets for portfolio construction is defined by portfolio manager. the robust optimization f...