THE IMPLICATIONS OF INSTITUTIONAL SPECIFICITIES ON THE INCOME INEQUALITIES DRIVERS IN EUROPEAN UNION

Ion Dobre,Ionut Jianu,Alexandru Bodislav,Carmen Radulescu,Sorin Burlacu (사)참누리 빈곤문제연구소 2019 빈곤없는세상 연구보고서 Vol.2019 No.-

This paper aims to review the different impacts of income inequality drivers on the Gini coefficient, depending on institutional specificities. In this context, we divided the European Union member states in two clusters (the cluster of member states with inclusive institutions / extractive institutions) using the institutional pillar as a clustering criterion. In both cases, we assesed the impact of income inequality drivers on Gini coefficient by using a fixed effects model in order to examine the role and importance of the institutions in the dynamics of income disparities.The models were estimated by applying the Panel Estimated Generalized Least Squares (EGLS) method, this being weighted by Cross-section weights option. The separate assessment of the income inequality reactivity to the change in its determinants according to the institutional criterion represents a new approach in this field of research and the results show that the impact of moderating income inequality strategies is limitedin the case of member states with extractive institutions.

Influence of sodium dodecyl sulfate and cetyl trimethylammonium bromide upon calcium carbonate precipitation on bacterial cellulose

Marta Stroescu,Anicuta Stoica-Guzun,Sorin Ion Jinga,Tanase Dobre,Iuliana Mihaela Jipa,Loredana Mihaela Dobre 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.9

Calcium carbonate was deposed on bacterial cellulose (BC) never-dried membranes in the presence of different concentrations of sodium dodecyl sulfate (SDS) and cetyl trimethylammonium bromide (CTAB) by a precipitation reaction between aqueous solutions of calcium chloride (CaCl2) and sodium carbonate (Na2CO3) containing,or not, surfactant in their composition. Different shapes of crystals were obtained from rhombohedral ones to flowerlike,depending on surfactant type and concentration. From the two surfactants tested, SDS has a greater influence on calcium carbonate morphology than CTAB. The only polymorph obtained in all studied cases was calcite. The composite films BC-calcite were characterized by means of scanning electron microscopy (SEM), X-ray diffraction (XRD),Fourier transform infrared spectroscopy (FTIR) and color measurements. The obtained BC-calcium carbonate composites could be used in paper manufacturing.

INFLUENCE OF COMPLIANCE FOR AN ELASTOKINEMATIC MODEL OF A PROPOSED REAR SUSPENSION

M. TICÃ,G. DOBRE,V. MATEESCU,G. VIRZI-MARIOTTI 한국자동차공학회 2014 International journal of automotive technology Vol.15 No.6

The research is carried out to improve passenger’s comfort to increase the vehicles stability in dynamicconditions. The literature available in the automotive engineering considers different topics for studying suspensions. Anexample represents mechanisms structure and analysis (synthesis, kinematics, and dynamics) under various operatingconditions. These aspects have been approached before analytically, numerical. The current paper studies the influence of thelateral force on the contact patch of the wheel and the corresponding variations of vehicle stability parameters, such as camberangle and wheel rear track. The study is performed for a newer innovative rear suspensions mechanism which does not havea wheel track and camber angle variation, relative to the chassis, when the suspension components was considered rigid. Anumerical solution is obtained through a virtual model on several commercial codes: MSC Adams, Patran, Nastran. Concerning the analysed parametes, their variation increases as the applied force is increased. Moreover, the largest variationcorresponds to the case were elastic bushings and deformable links are considered.

A New Design Paradigm for Secure Full-Duplex Multiuser Systems

Nguyen, Van-Dinh,Nguyen, Hieu V.,Dobre, Octavia A.,Shin, Oh-Soon IEEE 2018 IEEE journal on selected areas in communications Vol.36 No.7

<P>We consider a full-duplex (FD) multiuser system where an FD base station (BS) is designed to simultaneously serve both downlink (DL) and uplink (UL) users in the presence of half-duplex eavesdroppers (Eves). The problem is to maximize the minimum (max-min) secrecy rate (SR) among all legitimate users, where the information signals at the FD-BS are accompanied with artificial noise to debilitate the Eves’ channels. To enhance the max-min SR, a major part of the power budget should be allocated to serve the users with poor channel qualities, such as those far from the FD-BS, undermining the SR for other users, and thus compromising the SR per-user. In addition, the main obstacle in designing an FD system is due to the self-interference (SI) and co-channel interference (CCI) among users. We therefore propose an alternative solution, where the FD-BS uses a fraction of the time block to serve near DL users and far UL users, and the remaining fractional time to serve other users. The proposed scheme mitigates the harmful effects of SI, CCI, and multiuser interference, and provides system robustness. The SR optimization problem has a highly nonconcave and nonsmooth objective, subject to nonconvex constraints. For the case of perfect channel state information (CSI), we develop a low-complexity path-following algorithm, which involves only a simple convex program of moderate dimension at each iteration. We show that our path-following algorithm guarantees convergence at least to a local optimum. Then, we extend the path-following algorithm to the cases of partially known Eves’ CSI, where only statistics of CSI for the Eves are known, and worst-case scenario in which Eves can employ a more advanced linear decoder. The merit of our proposed approach is further demonstrated by extensive numerical results.</P>

Joint Information and Jamming Beamforming for Secrecy Rate Maximization in Cognitive Radio Networks

Nguyen, Van-Dinh,Duong, Trung Q.,Dobre, Octavia A.,Shin, Oh-Soon IEEE 2016 IEEE transactions on information forensics and sec Vol.11 No.11

<P>In this paper, we consider the secure beamforming design for an underlay cognitive radio multiple-input single-output broadcast channel in the presence of multiple passive eavesdroppers. Our goal is to design a jamming noise (JN) transmit strategy to maximize the secrecy rate of the secondary system. By utilizing the zero-forcing method to eliminate the interference caused by JN to the secondary user, we study the joint optimization of the information and JN beamforming for secrecy rate maximization of the secondary system while satisfying all the interference power constraints at the primary users, as well as the per-antenna power constraint at the secondary transmitter. For an optimal beamforming design, the original problem is a nonconvex program, which can be reformulated as a convex program by applying the rank relaxation method. To this end, we prove that the rank relaxation is tight and propose a barrier interior-point method to solve the resulting saddle point problem based on a duality result. To find the global optimal solution, we transform the considered problem into an unconstrained optimization problem. We then employ Broyden-Fletcher-Goldfarb-Shanno method to solve the resulting unconstrained problem, which helps reduce the complexity significantly, compared with the conventional methods. Simulation results show the fast convergence of the proposed algorithm and substantial performance improvements over the existing approaches.</P>

Resource Allocation for Downlink NOMA Systems: Key Techniques and Open Issues

Islam, S. M. Riazul,Zeng, Ming,Dobre, Octavia A.,Kwak, Kyung-Sup IEEE 2018 IEEE wireless communications Vol.25 No.2

<P>This article presents advances in resource allocation for downlink non-orthogonal multiple access (NOMA) systems, focusing on user pairing and power allocation algorithms. The former pairs the users to obtain high capacity gain by exploiting the channel gain difference between the users, while the latter allocates power to users in each cluster to balance system throughput and user fairness. Additionally, the article introduces the concept of cluster fairness and proposes the divide-and-next-largest-difference-based user pairing algorithm to distribute the capacity gain among the NOMA clusters in a controlled manner. Furthermore, performance comparison between multiple-input multiple-output NOMA (MIMO-NOMA) and MIMO orthogonal multiple access (MIMO-OMA) is conducted when users have pre-defined quality of service. Simulation results are presented, which validate the advantages of NOMA over OMA. Finally, the article provides avenues for further research on resource allocation for downlink NOMA.</P>

Allelopathic Potential of Select Gymnospermous Trees

Jaime A. TEIXEIRA da SILVA,Javad KARIMI,Sasan MOHSENZADEH,,Judit DOBRÁNSZKI 강원대학교 산림과학연구소 2015 Journal of Forest Science Vol.31 No.2

Allelopathy is an ecological phenomenon that refers to the beneficial or harmful effects of one plant on another plant, both crop and weed species, by the release of organic chemicals (allelochemicals) from plant parts by leaching, root exudation, volatilization, residue decomposition in soil and other processes in both natural and agricultural systems. Allelopathy can affect many aspects of plant ecology including occurrence, growth, plant succession, the structure of plant communities, survival, dominance, diversity, and plant productivity. In this review, we describe the concept of allelopathy, some mechanisms of operation within plants and then focus on a select number of gymnospermous tree genera: Ephedra, Pinus, Taxus, Cedrus, Juniperus, Picea, Cunninghamia and Araucaria. Pinus, Taxus (yew) and Cedrus (cedar) trees have a strong negative allelopathic effect on the germination, growth, or development of other plant species in the forest community.