Entropy-based location management in long-term evolution cellular systems

Roy, A.,Shin, J.,Saxena, N. IET 2012 IET communications Vol.6 No.2

<P>The recently emerging location-based services in long-term evolution (LTE) systems require the accurate and efficient tracking of mobile users. An optimal information-theoretic framework is developed for tracking area update (TAU) for next-generation LTE cellular systems. Shannon's entropy is used to characterise the location uncertainty of the mobile users. Based on this entropy-based tracking framework, two practical location management schemes, Bayesian-based TAU and entropy-coding based TAU, are proposed. The proposed schemes capture the users' mobility patterns online and perform profile-based paging to optimise the TAU cost. Of the two proposed schemes, the Bayesian-based TAU operates as an independently identically distributed process and improves the paging cost with less storage and computational overhead, whereas the entropy-coding-based TAU using the Lempel'Ziv strategy asymptotically minimises both the update and paging costs with higher storage and computational overheads than the Bayesian-based one. There is some trade-off between the update/paging costs and storage/computational overheads in the two proposed schemes. The simulation results demonstrate that both proposed schemes outperform the existing comparable schemes for LTE systems in all of the performance metrics.</P>

Electrochemical growth of Co(OH)2 nanoflakes on Ni foam for methanol electro-oxidation

Roy, A.,Jadhav, H.,Thorat, G.,Seo, J. Royal Society of Chemistry 2017 NEW JOURNAL OF CHEMISTRY Vol.41 No.17

Lacunarity analysis of fracture networks: Evidence for scale-dependent clustering

Roy, A.,Perfect, E.,Dunne, W.M.,Odling, N.,Kim, J.W. Pergamon Press 2010 Journal of structural geology Vol.32 No.10

Previous studies on fracture networks have shown that fractures contained within distinct mechanical units (''stratabound'') are regularly spaced while those that terminate within the rock mass are clustered (''non-stratabound''). Lacunarity is a parameter which can quantify the distribution of spaces between rock fractures. When normalized to account for differences in fracture abundance, lacunarity characterizes the distribution of spaces as the degree of clustering in the fracture network. Normalized lacunarity curves, L<SUP>*</SUP>(r), computed using the gliding-box algorithm and plotted as a function of box-size, r, were constructed for natural fracture patterns from Telpyn Point, Wales and the Hornelen basin, Norway. The results from analysis of the Telpyn Point fractures indicate that such curves are sensitive to differences in the clustering of different fracture sets at the same scale. For fracture networks mapped at different scales from the Hornelen basin, our analysis shows that clustering increases with decreasing spatial scale. This trend is attributed to the transition from a ''stratabound'' system at the scale of sedimentary cycles (100-200m) that act as distinct mechanical units to a ''non-stratabound'' fracture system geometry at the finer 10's of meters thick bedding scale.

Body Weight Misperception and Psychological Distress Among Children and Adolescents: The CASPIAN-V Study

Roya Riahi,Seyede Shahrbanoo Daniali,Ramin Heshmat,Mostafa Qorbani,Roya Kelishadi,Mohammad Esmaeil Motlagh 질병관리본부 2019 Osong Public Health and Research Persptectives Vol.10 No.5

Objectives: Misperception of weight status is a risk factor that affects psychological health. The aim of this study was to evaluate the association between weight misperception patterns and psychological distress among Iranian children and adolescents. Methods: This was a cross-sectional nationwide study where data was collected from 14,440 students, aged 7–18 years who participated in the national school-based surveillance program (CASPIAN-V). The students’ weight perception and psychological distress were assessed by validated questionnaires. Weight misperception was classified as misperception of being either underweight or overweight with respect to actual weight. Results: The rate of weight misperception in all study participants was 59.1%. In groups with a perception of being underweight or overweight, the risks of worthlessness, being worried, experiencing aggression, insomnia, or depression, were significantly higher than groups with an accurate weight perception (p < 0.05). The risk of anxiety in girls of normal weight who perceived themselves as underweight, decreased by 57% compared to girls with an accurate weight perception (OR: 0.43; 95% CI, 0.28-0.66). Conclusion: Weight misperception is highly prevalent among Iranian children and adolescents and is associated with their psychological health status. Appropriate education intervention needs to be developed to improve the children and adolescents’ perception of their body weight status.

RESEARCH : Population genetic structure analysis and effect of inbreeding on body weights at different ages in Iranian Mehraban sheep

( Roya Yavarifard ),( Navid Ghavi Hossein Zadeh ),( Abdol Ahad Shadparvar ) 한국동물자원과학회(구 한국축산학회) 2014 한국축산학회지 Vol.56 No.31

The objective of this study was to describe the population structure and inbreeding, and to quantify their effects on weights at different ages of Mehraban sheep in Iran. The analysis was based on the pedigree information of 26990 animals and 10278 body weight records from birth to yearling age. Data and pedigree information were collected during 1994 to 2011 by the breeding station of Mehraban sheep. The population structure was analyzed using the CFC program. Inbreeding of all animals was calculated by INBUPGF90 program. All animals were grouped into three classes according to their inbreeding coefficients: the first class included non-inbred animals (F=0); and the second and third classes included inbred animals (0<F<0.05 and F≥0.05, respectively). The average inbreeding in Mehraban sheep was 1.69%. Founder equivalent (fe) values were estimated to be 4244, 3116 and 2965 during 1994-1999, 2000-2005 and 2006-2011, respectively. The effective population sizes (Ne) were 363, 5080 and 5740 during 1994-1999, 2000-2005 and 2006-2011, respectively. Generation interval was 2.15 years for this breed of sheep. Regression coefficients of birth weight, 3-month weight, 6-month weight and yearling weight on lamb inbreeding were estimated to be -6.34.0.69, -14.68.5.33, 48.00.9.43 and 98.65?15.65, respectively. Both positive and negative inbreeding effects were found in the current study. The utilization of a program for designed mating system, in the present flock, could be a suitable approach to keep the level of inbreeding under control.

Robust decentralized control of structures using the LMI H_∞controller with uncertainties

Roya Raji,Ali Hadidi,Hosein Ghaffarzadeh,Amin Safari 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.22 No.5

This paper investigates the operation of the H_∞ static output-feedback controller to reduce dynamic responses under seismic excitation on the five-story and benchmark 20 story building with parametric uncertainties. Linear matrix inequality (LMI) control theory is applied in this system and then to achieve the desired LMI formulations, some transformations of the LMI variables is used. Conversely uncertainties due to material properties, environmental loads such as earthquake and wind hazards make the uncertain system. This problem and its effects are studied in this research. Also to decrease the transition of large amount of data between sensors and controller, avoiding the disruption of whole control system and economy problems, the operation of the decentralized controllers is investigated in this paper. For this purpose the comparison between the performance of the centralized, fully decentralized and partial decentralized controllers in uncoupled and coupled cases is performed. Also, the effect of the changing the number of stories in substructures is considered. Based on the numerical results, the used control algorithm is very robust against the parametric uncertainties and structural responses are decreased considerably in all the control cases but partial decentralized controller in coupled form gets the closest results to the centralized case. The results indicate the high applicability of the used control algorithm in the tall shear buildings to reduce the structural responses and its robustness against the uncertainties.

Prototype of an open-source web-GIS platform for rapid disaster impact assessment

Roya Olyazadeh,Zar Chi Aye,Michel Jaboyedoff,Marc-Henri Derron 대한공간정보학회 2016 Spatial Information Research Vol.24 No.3

Impacts of natural disasters have increased worldwide in the past decades. Earthquakes are one of the disasters that have been studied for real-time analysis and crisis management. Disaster-related losses have been examined by the damage extent of the houses, infrastruc- tures, fatalities and injuries converted to financial losses. Web-GIS technologies provide a wide range of solutions to map these damages, analyze data and publish the results on the web. Open-source tools and data have been widely used today because they stay free and facilitate access to data especially significant in developing countries. This research presents a web-GIS prototype using open-source geo-spatial technologies such as Postgis, GeoServer, Geo- explorer and OpenStreetMap (OSM) to evaluate the rapid impact of naturally produced disasters like earthquake for the estimation of total damages. For this purpose, expert knowledge such as earthquake intensities and vulnerability inputs are imported into the system. Moreover, OSM data for building information are also extracted for the analysis and the loss of the damage is then rapidly estimated and visualized in the platform. This work is part of a project for catastrophe modeling based on open-source data and soft- ware. We hope that applying open-source data, techniques and solutions will decrease the time and efforts needed for rapid disaster and catastrophe management.

Effect of Dry Lubrication to Reduce Wheel Flange Wear of Railcars in Railway of Iran

Roya Sadat Ashofteh,Farhad Samari 한국철도학회 2014 International Journal of Railway Vol.7 No.3

In this paper, the reduction effect of dry (solid) lubrication on wheel flange wear rates is studied. The solid / dry lubricator systems were attached to the most front and furthest back axles of a coach in order to examine the wear behavior of the equipped wheels. An attempt is also made to make a comparison between wear behaviors of these wheel flanges having dry lubrication devices with non-lubricated wheels in other railcars. Finally, a comparison is made between life-cycle of wheels under investigation and other similar wheel types.

HELIUM ADSORPTION ON CARBON NANOCONES WITH DIFFERENT DISCLINATION ANGLE: MOLECULAR DYNAMICS SIMULATION

ROYA MAJIDI 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.3

We have used molecular dynamics simulation to study the in°uence of disclination angle on helium adsorption capacity of carbon nanocones (CNCs). Adsorption capacities of 180?, 240? and 300? CNCs have been compared at various temperatures. The results indicate that helium atoms adsorb on internal and external surfaces of the CNCs. At saturation conditions, the endohedral adsorption coverage is decreased by increasing the disclination angle, while the exohedral adsorption coverage is independent of this angle. It is also found that temperature has a considerable e®ect on the adsorbed amount. Comparison of the adsorption on CNCs with carbon nanotubes indicates that the adsorption capacity of cones is greater than those of tubes. Our results con¯rm the fact that the CNCs are good candidate for gas storage.

COVID-19 and abortion right

Roya Rashidpouraie,Mohammad Nader Sharifi 대한산부인과학회 2020 Obstetrics & Gynecology Science Vol.63 No.6

Induced abortion has always been a challenging topic; however, it needs to be discussed during the coronavirusdisease 2019 (COVID-19) pandemic.