bluuebunny/crossref_metadata_2025 huggingface dataset:
Coping Strategies in the Family and School Ecosystem
Authors: Sánchez-Romero Cristina , Muñoz-Jiménez Eva María , Martínez-Sánchez Isabel , López-Berlanga María del Carmen
Published: July 2020

The objective of the present study is to study children’s coping strategies used when faced with different stressors in their daily life (problems with their school work, problems getting along with other children and problems at home with people in their family), in a vulnerable social environment. This objective was evaluated through the Child Coping Questionnaire. The research for this study was conducted through a descriptive, inferential, quantitative, ex post facto design. The sample consisted of 50 schoolchildren from one suburban primary school in Madrid, Spain. The ages of the children range from 8 to 11 years. At present, almost 25% families are in a vulnerable situation. This instrument measures 14 coping categories that analyse positive and self-effective attitudes to favour socio-communicative processes and decision-making in situations of conflict between students. The results indicate that what bothers children the most is, first of all, problems getting along with other children (35.8%), problems with their school work (30.2%) and problems at home with people in their family (24.5%). Regarding their lifestyle outside the school environment and relationship with their family, 38% of participants spend a lot of time outside their home, according to our findings. This result can explain the difficulties in completing their homework that these children have. This can also trigger a curricular gap compared to their reference group, which can sometimes lead to school failure.
Machine Learning Application in Reservoir Water Level Forecasting for Sustainable Hydropower Generation Strategy
Authors: Sapitang Michelle , M. Ridwan Wanie , Faizal Kushiar Khairul , Najah Ahmed Ali , El-Shafie Ahmed
Published: July 2020

The aim of this study is to accurately forecast the changes in water level of a reservoir located in Malaysia with two different scenarios; Scenario 1 (SC1) includes rainfall and water level as input and Scenario 2 (SC2) includes rainfall, water level, and sent out. Different time horizons (one day ahead to seven days) will be investigated to check the accuracy of the proposed models. In this study, four supervised machine learning algorithms for both scenarios were proposed such as Boosted Decision Tree Regression (BDTR), Decision Forest Regression (DFR), Bayesian Linear Regression (BLR) and Neural Network Regression (NNR). Eighty percent of the total data were used for training the datasets while 20% for the dataset used for testing. The models’ performance is evaluated using five statistical indexes; the Correlation Coefficient (R2), Mean Absolute Error (MAE), Root Mean Square Error (RMSE), Relative Absolute Error (RAE), and Relative Squared Error (RSE). The findings showed that among the four proposed models, the BLR model outperformed other models with R2 0.998952 (1-day ahead) for SC1 and BDTR for SC2 with R2 0.99992 (1-day ahead). With regards to the uncertainty analysis, 95PPU and d-factors were adopted to measure the uncertainties of the best models (BLR and BDTR). The results showed the value of 95PPU for both models in both scenarios (SC1 and SC2) fall into the range between 80% to 100%. As for the d-factor, all values in SC1 and SC2 fall below one.
Impact Evaluation of Bike-Sharing on Bicycling Accessibility
Authors: Song Mingzhu , Wang Kaiping , Zhang Yi , Li Meng , Qi He , Zhang Yi
Published: July 2020

The presence of bike-sharing has a significant influence on the ease of trips by bike, which is one critical aspect of bicycling accessibility (BAcc). The existing measurements of BAcc rarely consider the factor of ownership of bikes, which means that no distinction is made between private-bikes and shared bikes. To measure BAcc more fully, this paper proposes a method to evaluate the influences of bike-sharing on BAcc and to perform the method on a real-world case study in Beijing. It is found that bike-sharing has a boosting effect on BAcc, and the increased rate of BAcc is significantly affected by bicycling frequency and shared-bike availability. A case study in Beijing utilizing geo-location data collected from two major bike-sharing companies (OFO and Mo-bike) illustrates the significance of the impact of bike-sharing on BAcc and the necessity to include bike-sharing in the measurement of BAcc. Besides, the case study shows BAcc around the transit station is better than that over the whole area. Given that bicycling feeds transit, this research lays the foundation for analyzing the combination of bike-sharing and transit from the perspective of accessibility and can further support transportation planning.
Uses of ICT Tools from the Perspective of Chilean University Teachers
Authors: Marín-Díaz Verónica , Riquelme Irma , Cabero-Almenara Julio
Published: July 2020

The use of the ICT in university learning processes is linked to their use by the educator. This aspect will determine the use of some resources over others, and consequently, the prevalence of some methodologies over others. The main objective of this work is to determine the use of the ICT by university educators, and from this, to determine which elements will define the design of a training program on the use of the ICT. For this, and with the use of an ex post facto method with a sample of n = 1113 subjects, the main result obtained was that the male professors utilized the digital tools more often for their teaching tasks. Furthermore, those with less professional experience preferred to use tools found in the cloud. Thus, it is concluded that the model of training observed from the demonstrated use of digital resources is linked to the preoccupation of education professionals for caring for the digital environment, and this model should be designed as a function of the methodologies and the system of evaluations utilized by the professors.
Thermal Sensation in Courtyards: Potentialities as a Passive Strategy in Tropical Climates
Authors: Apolonio Callejas Ivan Julio , Cleonice Durante Luciane , Diz-Mellado Eduardo , Galán-Marín Carmen
Published: July 2020

Climate change will bring changes to our living conditions, particularly in urban areas. Climate-responsive design strategies through courtyards can help to moderate temperatures and reduce the thermal stress of its occupants. Thermal response inside courtyard is affected not only by its morphological composition but also by subjective factors. Thus, standardized thermal scales may not reflect the stress of the occupants. This study investigated the impact on thermal attenuation provided by a courtyard located in a tropical climate under extreme cold and hot synoptic conditions by means of local thermal sensation scales. Microclimatic variables were monitored, simultaneously with the application of a thermal comfort questionnaire, by using weather stations installed outside and inside the courtyard. The Modified Physiological Equivalent Temperature Index (mPET) was utilized to predict the heat stress. Calibration was conducted using linear regression to attribute particular thermal sensation votes to correspondent mPET values. It was found that thermal sensation can be affected by factors such as psychological, behavioral, and physiological. The courtyard’s form provides a passive cooling effect, stabilizing interior thermal sensation, with attenuation peaks of 6.4 °C on a cold day and 5.0 °C on a hot day. Courtyards are an alternative passive strategy to improve thermal ambience in tropical climate, counterbalancing climate change.
Convective Effect on Magnetohydrodynamic (MHD) Stagnation Point Flow of Casson Fluid over a Vertical Exponentially Stretching/Shrinking Surface: Triple Solutions
Authors: Lund Liaquat Ali , Omar Zurni , Khan Ilyas , Baleanu Dumitru , Nisar Kottakkaran Sooppy
Published: July 2020

In the current study, the characteristics of heat transfer of a steady, two-dimensional, stagnation point, and magnetohydrodynamic (MHD) flow of shear thickening Casson fluid on an exponentially vertical shrinking/stretching surface are examined in attendance of convective boundary conditions. The impact of the suction parameter is also considered. The system of governing partial differential equations (PDEs) and boundary conditions is converted into ordinary differential equations (ODEs) with the suitable exponential similarity variables of transformations and then solved using the shooting method with the fourth order Runge–Kutta method. Similarity transformation is an important class of phenomena in which scale symmetry allows one to reduce the number of independent variables of the problem. It should be noted that solutions of the ODEs show the symmetrical behavior of the PDES for the profiles of velocity and temperature. Similarity solutions are obtained for the case of stretching/shrinking and suction parameters. It is revealed that there exist two ranges of the solutions in the specific ranges of the physical parameters, three solutions depend on the opposing flow case where stagnation point (A) should be equal to 0.1, two solutions exist when λ1 = 0 where λ1 is a mixed convection parameter and A > 0.1, and a single solution exists when λ1 > 0. Moreover, the effects of numerous applied parameters on velocity, temperature distributions, skin friction, and local Nusselt number are examined and given through tables and graphs for both shrinking and stretching surfaces.
On the Failure of Classic Elasticity in Predicting Elastic Wave Propagation in Gyroid Lattices for Very Long Wavelengths
Authors: Rosi Giuseppe , Auffray Nicolas , Combescure Christelle
Published: July 2020

In this work we investigate the properties of elastic waves propagating in gyroid lattices. First, we rigorously characterize the lattice from the point of view of crystallography. Second, we use Bloch–Floquet analysis to compute the dispersion relations for elastic waves. The results for very long wavelengths are then compared to those given by classic elasticity for a cubic material. A discrepancy is found in terms of the polarization of waves and it is related to the noncentrosymmetry of the gyroid. The gyroid lattice results to be acoustically active, meaning that transverse waves exhibit a circular polarization when they propagate along an axis of rotational symmetry. This phenomenon is present even for very long wavelengths and is not captured by classic elasticity.
Buckling of Corrugated Ring under Uniform External Pressure
Authors: Andrianov Igor I. , Andrianov Igor V. , Diskovsky Alexander A. , Ryzhkov Eduard V.
Published: July 2020

Stability analysis of a corrugated ring subjected to uniform external pressure is under consideration. Two main approaches to solving this problem are analyzed. The equivalent bending stiffness approach is often used in engineering practice. It is based on some plausible assumptions about the behavior of a structure. Its advantage is the simplicity of the obtained relations; the disadvantage is the difficulty in estimating the area of applicability. In this paper, we developed an asymptotic homogenization method for calculating the critical pressure for a corrugated ring, which made it possible to mathematically substantiate and refine the equivalent bending stiffness approach. To evaluate the results obtained using the equivalent stiffness approach and asymptotic homogenization method, the imperfection method is used. The influence of the corrugation parameters on buckling pressure is analyzed.
Study on Inside Threats Based on Analytic Hierarchy Process
Authors: Seo Sang , Kim Dohoon
Published: July 2020

Insider threats that occur within organizations cause more serious damage than external threats. However, there are many factors that are difficult to determine, such as the definition, classification, and severity of security breaches; hence, it is necessary to analyze system logs and user behavior-based scenarios within organizations. The reality is that qualitative judgment criteria are different for everyone to apply, and there is no detailed verification procedure to compare them objectively. In this study, realistic insider threats were examined through the definition, classification, and correlation/association analysis of various human–machine logs of acts associated with security breaches that occur in an organization. In addition, a quantitative process and decision-making tool were developed for insider threats by establishing various internal information leakage scenarios. As a result, insider threats were assessed quantitatively and a decision-making process was completed that enabled case analysis based on several insider threat scenarios. This study will enable precise modeling of insider threats that occur in real organizations and will support an objective process and a decision-making system to establish a range of required information for security protection measures.
Primary Human Derived Blood Outgrowth Endothelial Cells: An Appropriate In Vitro Model to Study Shiga Toxin Mediated Damage of Endothelial Cells
Authors: Feitz Wouter J. C. , van de Kar Nicole C. A. J. , Cheong Ian , van der Velden Thea J. A. M. , Ortiz-Sandoval Carolina G. , Orth-Höller Dorothea , van den Heuvel Lambert P. J. W. , Licht Christoph
Published: July 2020

Hemolytic uremic syndrome (HUS) is a rare disease primarily characterized by hemolytic anemia, thrombocytopenia, and acute renal failure. Endothelial damage is the hallmark of the pathogenesis of HUS with an infection with the Shiga toxin (Stx) producing Escherichia coli (STEC-HUS) as the main underlying cause in childhood. In this study, blood outgrowth endothelial cells (BOECs) were isolated from healthy donors serving as controls and patients recovered from STEC-HUS. We hypothesized that Stx is more cytotoxic for STEC-HUS BOECs compared to healthy donor control BOECs explained via a higher amount of Stx bound to the cell surface. Binding of Shiga toxin-2a (Stx2a) was investigated and the effect on cytotoxicity, protein synthesis, wound healing, and cell proliferation was studied in static conditions. Results show that BOECs are highly susceptible for Stx2a. Stx2a is able to bind to the cell surface of BOECs with cytotoxicity in a dose-dependent manner as a result. Pre-treatment with tumor necrosis factor alpha (TNF-α) results in enhanced Stx binding with 20–30% increased lactate dehydrogenase (LDH) release. Endothelial wound healing is delayed in a Stx2a-rich environment; however, this is not caused by an effect on the proliferation rate of BOECs. No significant differences were found between control BOECs and BOECs from recovered STEC-HUS patients in terms of Stx2a binding and inhibition of protein synthesis.
Event-Based Rainfall Interception Modeling in a Cerrado Riparian Forest—Central Brazil: An Alternative Approach to the IS Method for Parameterization of the Gash Model
Authors: Távora Bruno Esteves , Koide Sérgio
Published: July 2020

Although being the second largest biome in South America, the Cerrado biome is understudied in terms of hydrological modeling of the interception processes of its different vegetation types. To better understand its net precipitation components, high-temporal-resolution throughfall data were used to parameterize the Gash Analytical Model on a per storm basis. Two different methods (Single Event Regression—SI, and Particle Swarm Optimization—PSO) for parametrizing the Gash model were tested. Simulated throughfall from 35 events showed the Nash coefficient ranging from 0.779 to 0.989, confirming the good phenomenological approach of the Gash model. One of the most important results presented in this work was the analysis of the variability of the parameters. Considering the PSO method, we observed a mean free throughfall (ρ) of 0.17, with a confidence interval ranging from 0.16 to 0.18. The storage (S) confidence intervals ranged from 1.11 mm to 1.62 mm, with a mean value of 1.37 mm. The observed saturation depth (P′G) mean value was 1.66 mm, with a confidence interval from 1.35 mm to 1.97 mm. Finally, the mean evaporation precipitation rate (E/R) was of 0.20, with confidence bands from 0.15 to 0.24. Overall, there were observed higher losses from the Cerrado compared to other Brazilian biomes such as the Amazon and Atlantic Forest. These findings can contribute to the parameterization of hydrological models applied to the Brazilian Cerrado.
A Climatological Interpretation of Precipitation δ18O across Siberia and Central Asia
Authors: Wang Tao , Li Ting-Yong , Zhang Jian , Wu Yao , Chen Chao-Jun , Huang Ran , Li Jun-Yun , Xiao Si-Ya , Artemevna Blyakharchuk Tatiana
Published: July 2020

Siberia and Central Asia are located at middle to high latitudes, encompassing a large landlocked area of the Eurasian continent and vast tracts of permafrost, which are sensitive to global climate change. Here, we investigated the data from 15 Global Network of Isotopes in Precipitation (GNIP) stations to clarify the relationship between precipitation δ18O (δ18OP) and the local temperature and precipitation amount on the monthly, seasonal, and annual timescales. Three main conclusions as following: (1) On the monthly time scale, the variation in δ18OP is mainly controlled by the “temperature effect”. (2) The weighted average value of precipitation δ18O (δ18Ow) exhibited “temperature effect” over 60° N–70° N. However, δ18Ow was dominated by multiple factors from 40° N to 60° N (e.g., the North Atlantic Oscillation (NAO) and water vapor source changes). (3) The variations of δ18OW can be attributed to the changes in pathway of the westerly dominated by the NAO at annual timescale. Therefore, it is possible to reconstruct the histories of past atmospheric circulations and water vapor sources in this region via δ18O in geologic archives, e.g., speleothem and ice core records.
Attention and Water Governance: An Agenda-Setting Perspective
Authors: Tosun Jale , Scherer Ulrike
Published: July 2020

The concept of agenda-setting has resulted in vibrant research in political science. The aim of this Special Issue is to advance the state of research on water governance by alluding to the possibilities for applying this particular theoretical perspective to water issues. Agenda-setting concerns how and when issues enter the public debate (discussion agenda) or are taken into account by policymakers with a view to proposing policies (decision agenda). Simply put, agenda-setting is about the process of drawing or paying attention to certain issues. Despite the intuitiveness of this concept, the underlying political and societal processes related to water governance are complex and require careful research designs in order to realize the full potential of agenda-setting research. The contributions to this Special Issue combine theoretically convincing research on agenda-setting with research on issues in water governance.
Sub-Hourly Variability of Stable Isotopes in Precipitation in the Marginal Zone of East Asian Monsoon
Authors: Han Tingting , Zhang Mingjun , Wang Shengjie , Qu Deye , Du Qinqin
Published: July 2020

Isotope data at mid-latitude locations are commonly available on annual, monthly, and daily timescales; however, they are rarely available for the variations occurring on the sub-hourly scale within individual precipitation events. To fill this gap, sub-hourly (every 10 min) sequential samples were collected for nine precipitation events, and the δ18O values of the individual events were analyzed from June to October 2019 in Lanzhou, Northwest China. The Sequential Meteoric Water Line (SMWL) correlation between δ2H and δ18O is δ2H = 7.33 δ18O + 9.78 (R2 = 0.97, N = 170). All events had a similar decreasing variability pattern in the initial period (before the vertical gray dotted line), while during the later period (after the vertical gray dotted line), negative δ18O values dominated, exhibiting a different pattern. Variations in the δ18O values were about 1–5‰ during most intra-events. We found that δ18O values mainly exhibit three patterns in the intra-event, namely a “V”-shaped pattern, an “L”-shaped pattern, and a decreasing pattern. Positive δ18O values are controlled by re-evaporation in the beginning period. Relative humidity has no effect on the δ18O values of precipitation events, mainly because dry and warm conditions are conducive to the evaporation of rainwater in the study region. The changes in the isotopic characteristics of precipitation are closely linked to the regional climate. The continuous analysis of precipitation samples revealed that the rapid change of δ18O values is related to different moisture sources and transport paths. A new air mass with enriched heavy isotope intrusion can change the isotopic composition in the intra-event.
Biodegradation of Amoxicillin, Tetracyclines and Sulfonamides in Wastewater Sludge
Authors: Yang Chu-Wen , Liu Chien , Chang Bea-Ven
Published: July 2020

The removal of antibiotics from the aquatic environment has received great interest. The aim of this study is to examine degradation of oxytetracycline (OTC), tetracycline (TC), chlortetracycline (CTC), amoxicillin (AMO), sulfamethazine (SMZ), sulfamethoxazole (SMX), sulfadimethoxine (SDM) in sludge. Four antibiotic-degrading bacterial strains, SF1 (Pseudmonas sp.), A12 (Pseudmonas sp.), strains B (Bacillus sp.), and SANA (Clostridium sp.), were isolated, identified and tested under aerobic and anaerobic conditions in this study. Batch experiments indicated that the addition of SF1 and A12 under aerobic conditions and the addition of B and SANA under anaerobic conditions increased the biodegradation of antibiotics in sludge. Moreover, the results of repeated addition experiments indicated that the efficiency of the biodegradation of antibiotics using the isolated bacterial strains could be maintained for three degradation cycles. Two groups of potential microbial communities associated with the aerobic and anaerobic degradation of SMX, AMO and CTC in sludge were revealed. Twenty-four reported antibiotics-degrading bacterial genera (Achromobacter, Acidovorax, Acinetobacter, Alcaligenes, Bacillus, Burkholderia, Castellaniella, Comamonas, Corynebacterium, Cupriavidus, Dechloromonas, Geobacter, Gordonia, Klebsiella, Mycobacterium, Novosphingobium, Pandoraea, Pseudomonas, Rhodococcus, Sphingomonas, Thauera, Treponema, Vibrio and Xanthobacter) were found in both the aerobic and anaerobic groups, suggesting that these 24 bacterial genera may be the major antibiotic-degrading bacteria in sludge.
Differences in the Vertical Distribution of Two Cladoceran Species in the Nakdong River Estuary, South Korea
Authors: Kim Seong-Ki , Choi Jong-Yun
Published: July 2020

As cladocerans are a primary food source for fish, predator avoidance is important to sustain cladoceran populations. We hypothesized that Bosmina longirostris and Daphniaobtusa would show different vertical distributions that depend on environmental variables and their life cycle phase. Quarterly monitoring was implemented in three water column layers (upper, middle, and bottom) in the Nakdong River Estuary. Cladocerans were mostly observed during summer; B. longirostris and D.obtusa were most abundant and exhibited different vertical distributions. Large (>600 μm) D.obtusa individuals were mainly distributed in the bottom layer (9–11 m) during the daytime and in the upper layer (1–3 m) at night. Utilization of the bottom layer by large D. obtusa was possibly a defense strategy to avoid fish predation. Although the bottom layer was not supported by lower water temperatures and dissolved oxygen than the upper or middle layers, as suggested in the previous study, we assumed that high turbidity replaced this role as a place shunned by fish (and thus a refuge for Daphnia obtusa). In contrast, smaller individuals remained in the upper layer at all times because of the low predation risk. The consumption of B. longirostris by fish was low, as the largest B. longirostris (411 μm) was smaller than the small-sized Daphnia. From this finding, we suggest that the vertical distribution of cladocerans likely depends on selectivity feeding based on fish size rather than the presence/absence of fish. We considered that these results are an important advance in understanding distribution patterns of cladocerans related to environmental features, as well as their key predators.
La gestion des comportements perturbateurs des élèves du secondaire par les enseignants stagiaires tunisiens en éducation physique : effets d’un programme de formation en prévention et en gestion de l’indiscipline
Authors: MADDEH Talel , AMAMOU Salem , DESBİENS Jean-françois , SOUISSI Nizar
Published: July 2020

En Tunisie, la formation préparatoire à l’enseignement de l’éducation physique (EP) ne compte aucun cours spécifiquement dédié à la prévention ainsi qu’à la gestion des comportements d’indiscipline (CI). Devant ce constat, il est apparu pertinent d’élaborer et de mettre en œuvre une formation complémentaire en prévention et en gestion de l’indiscipline s’appuyant sur le modèle de Sieber (2001). Cet article a pour objectif général de décrire et d’analyser les effets d’une formation complémentaire sur la compétence d’enseignants stagiaires tunisiens en EP à prévenir et à gérer l’indiscipline. Pour ce faire, recherche quantitative adoptant un devis quasi-expérimental en trois temps basé sur des analyses vidéoscopiques en différé a été réalisée sur deux groupes de stagiaires : un groupe expérimental (GrExp ; n = 5) et un groupe témoin (GrTém ; n = 5). Les résultats obtenus indiquent une diminution de l’apparition des CI et des fractures de l’enseignement dans les cours des stagiaires du GrExp. Ce constat pourrait être expliqué par une nette amélioration du GrExp comparativement au GrTém quant à sa compétence de prévenir et gérer l’indiscipline. Dans cette perspective, l’étude encourage les institutions de formation à l’enseignement à bonifier et à réviser leur curriculum de formation afin de mieux préparer les enseignants à composer de façon stratégique avec les CI des élèves.
A research survey on scheduling techniques in lte-based network and its state of art
Authors: K Srinivasa R , A.R2 Hemantha Kumar
Published: July 2020

Scarce wireless resources, lead to development of cognitive radio network as a solution to unlicensed users communication in the licensed frequency band. In response to the behavior of licensed users communication, unlicensed users communication need to change from one frequency band to another band. In this communication paradigm, the performance of unlicensed users transmission control protocol gets degraded due to the features of cognitive radio network. To overcome this, several authors suggested quite a few modifications in the existing wireless transport protocol for cognitive radio network environment. This paper gives an overview of different transport protocols used for unlicensed users’ communication in cognitive radio networks.
Efficient image retrieval through hybrid feature set and neural network
Authors: Arora Nitin , Ashok Alaknanda , Tiwari Shamik
Published: July 2020

Images are an important part of daily life. The huge repository of digitally existing images cannot be easilycontrolled by any individual. Extensive scanning of the image database is very much essential to search a particularimage from the huge repository. In some cases, this procedure becomes very exhaustive also. As a result, if a count often thousand, lakhs or considerably more images are included in image database, then it may be transformed into atedious and never ending process. Content-based image retrieval (CBIR) is a technique, which is used for retrievingany image. This type of image retrieval procedure is centred on the actual content of image. This paper proposed amodel of hybrid feature set of Haar wavelets and Gabor features and analysed with different existing models imageretrieval. Content based image retrieval using hybrid feature set of Haar wavelets and Gabor features superiors onother models.
An enhanced hybrid Pareto metaheuritic algorithm-based multicast tree estimation for reliable multicast routing in VANETs
Authors: Janakiraman Sengathir
Published: July 2020

Prompt and reliable data dissemination among the vehicular nodes of the network is indispensable as its mobility rate and limited coverage characteristics introduce the possibility of frequent topology changes. The effective and efficient sharing of critical information in the event of emergency necessitates either direct interaction or Road Side Units (RSUs)-based vehicular communication in the primitive place. Multicast routing is confirmed to be the significant scheme of data transfer since they establish reliable data dissemination between the source and destination vehicular nodes by estimating an optimal multicast tree. Moreover, QoS-constraint enforced meta-heuristic approaches are considered to be excellent for determining optimal multicast tree under multicasting. An Enhanced Hybrid Pareto Metaheuritic Algorithm-based Multicast Tree Estimation Scheme (EHPMA-MTES) is contributed for reliable multicast routing. The proposed EHPMA-MTES is confirmed to reduce the cost of transmission by 28% through the minimization of the multicast tree count formed during the process of multicast routing.
Wireless transport protocol variants for cognitive radio networks
Authors: Let G Shine , Bala G Josemin , Magdalene W.
Published: July 2020

Scarce wireless resources, lead to development of cognitive radio network as a solution to unlicensed users communication in the licensed frequency band. In response to the behavior of licensed users communication, unlicensed users communication need to change from one frequency band to another band. In this communication paradigm, the performance of unlicensed users transmission control protocol gets degraded due to the features of cognitive radio network. To overcome this, several authors suggested quite a few modifications in the existing wireless transport protocol for cognitive radio network environment. This paper gives an overview of different transport protocols used for unlicensed users’ communication in cognitive radio networks.
Assessment of fog and rain induced-attenuation on terrestrial FSO links
Authors: Ajewole M. O. , Owolawi P. A. , Ojo J. S. , Adetunji R. M.
Published: July 2020

Launching into the next generation of wireless communication network (5G network) requires secure highdata rate, high speed and huge bandwidth links. With the tremendous increase in broadband users, the existingcommunication systems such as radio frequency (RF) and microwave links cannot meet up with the challenges due totheir link interference and low bandwidth. A current technology that promises such requirements and more is FreeSpace Optical (FSO) communication. The FSO basically involves the transmission of signal-modulated opticalradiation from a transmitter to a receiver through the atmosphere or outer space. It is designed to complement thetraditional fibre optical communication links. However, location-variant atmospheric channel degrades the qualityand performance of an FSO system under severe atmospheric conditions. This paper attempts to assess both fog- andrain-induced attenuation on the performance of FSO link in a terrestrial terrain using measured visibility and rainrate data at Akure, Nigeria. 5-year (2012-2016) archived visibility data and measured rain rate data of 1-minuteintegration time obtained from Nigerian Meteorological Agency (NIMET) and the Department of Physics, FederalUniversity of Technology, Akure respectively, were used to compute the fog- and rain-induced specific attenuationsusing Kruse and Carboneur models. The performance of the FSO system was analyzed through link margin by usingthe parameters of a commercial optical transceiver, Terescope 5000. Findings from this work will be useful for FSOsystem design in the area.
Mathematical document retrieval system based on signature hashing
Authors: Dhar Sourish , Roy Sudipta
Published: July 2020

Scientific documents and magazines involve large number of mathematical expressions and formulas alongwith text. The continuous growth of such documents necessitates the requirement of developing specialized tools andtechniques, which could handle and analyse mathematical expressions and formulas. Mathematical expressions andformulae are highly structured and quite different from traditional text. Due to which conventional text retrievalsystem performs poorly in retrieving scientific documents based on mathematical expression formulated as a query.Mathematical information retrieval is concerned with finding information in documents that include mathematics. Toaddress the challenges posed by mathematical formulae as compared to text, this paper aims to construct a mathaware search engine, which can retrieve relevant scientific documents based on a mathematical query. A novelsignature based hashing scheme to index raw mathematical web documents is proposed in this paper, which can alsotake mathematical notational equivalences into account. The proposed system demonstrates better precision andstability of the ranked results when compared with other related state-of-the-art math aware search engines.
Internet usage and self-regulated learning assessment at junior high school students in Tasikmalaya City, Indonesia
Authors: El Akbar R. Reza , Ratnaningsih Nani , Hidayat Edi
Published: July 2020

describes the pattern of relationship between internet usages on students, on the assessment of aspects of selfregulated learning. The aspect of self-regulated learning measured from 10 aspects. This study discusses the effects ofgender, the categories of schools (excellent schools and regular school), the total value of self-regulated learning andthe value of math exams. In brief, the research stages consist of three stages. The first stage of research is to createand retrieve the questionnaire data. The goal is to obtain all things related to internet usage, as well as measure aspectsof self-regulated learning assessment. The second stage of treatment on students. This treatment time is done for fourmonths, where students follow the math lesson with self-regulated learning method. Students provided with multimediadevices, textbooks and other. The third stage is the assessment or math test. The analytical method used is qualitativemethod with descriptive statistical approach. The results obtained that the dominant male students using internet forgames tend to have greater Aspects of Finding and Utilizing Relevant Learning Resources. While female, tend to bedominant in aspects of Evaluating Learning Processes and Results. The average mathematical exam results, in studentswho often use the game tend to have a higher value, compared with other students who often use social media.
Fog and rain attenuation characterization and performance of terrestrial free space optical communication in Akure, Nigeria
Authors: O Ajewole M. , A Owolawi P. , S Ojo J. , M. Adetunji R.
Published: July 2020

Reliable broadband communication requires secure high data rate and bandwidth links. With the observedincrease in broadband users, known communication systems such as RF and microwave links cannot promise suchrequirements due to link interference and low bandwidth. A current communication system that promises suchrequirements and more is Free Space Optical (FSO) communication. This system basically involves the transmissionof signal-modulated optical radiation from a transmitter to a receiver through the atmosphere or outer space. However,location-variant atmospheric channel degrades the performance of an FSO system under severe atmosphericconditions, thus necessitating local atmospheric attenuation studies.This paper presents the characterization of both fog- and rain-induced attenuation and the performance ofan FSO system in a terrestrial terrain at Akure, Nigeria. One-year archived visibility data and in-situ measured 1-minute integration time rain rate data obtained from Nigerian Meteorological Agency (NIMET) and the Departmentof Physics, Federal University of Technology, Akure were used to compute the fog- and rain-induced specificattenuations using Kruse model and Carboneur model respectively. The performance of the FSO system is analyzedthrough link margin by using the parameters of a commercial optical transceiver, Terescope 5000.
Mapping perception of consumer antivirus software with multidimensional scaling method
Authors: Nurhayati Ai , . Frencius
Published: July 2020

Antivirus software industry is growing rapidly in the world in 2018. The domestic antivirus software industrymust be able to compete on a global scale. To face free trade, Indonesia's antivirus software industry must be able toknow its position in the minds of consumers, especially domestic consumers. In this research, Smadav will representthe antivirus software industry from Indonesia. In this research want to know how the position of smadav comparedwith its current competitors, namely Avast, Avira, AVG, Kaspersky, McAfee and Norton. This research is only done tomap antivirus software based on similarity according to respondent's perception. This research uses Multidimensionalscaling (MDS) method through SPSS software program version 23. The results showed that there are three groups ofdifferent antivirus software based on similarity level according to the respondent's perception. On the two-dimensionaland three-dimensional maps Norton antivirus software, Avast and Avira have similar resemblance according to therespondent's perception, because the location is closest and is in the same quadrant. Smadav differs according toperceptions of respondents. AVG, McAfee and Kaspersky have similarities according to respondents' perceptions.
Performance comparison of asymmetric cryptography (case study-mail message)
Authors: Sann Zarni , Soe Thi Thi , Knin Kaythi Wyut Mhone , Win Zin May
Published: July 2020

Data encryption is well known as essential for today’s technology. ElGamal encryption and RSA algorithmis made before storing mails to mail server. ElGamal decryption and RSA decryption is made after retrieving mailsfrom mail server. This system is implemented to secure mail server system for local government’s important mailmessages. These algorithms consume a considerable amount of time and resources of memory, CPU time, andcomputation time to encrypt and decrypt data. This paper discuss the results comparison of these algorithms in termof encryption time, decryption time, and memory usage over variable file sizes. The results show that RSA does fasterencryption process in compare with ElGamal. However, ElGamal decryption process is quicker than RSA. This systemis also expressed comparison of storage Size between RSA and ElGamal. Both of these algorithms are cryptographicpublic-key algorithms but have roles in different techniques. This system is using C# programming language and SQLServer to store mail messages.
Choosing a Computer Language for Institutional Research
Authors: Strenglein Denise
Published: July 2020

A strongly felt need for a multipurpose and simple-to-use computer language emerges as more and more institutional research offices acquire computer terminals. A veritable Babel of computer languages exists (Ryland, 1979), and a good deal of thought should be given to choosing the right language. Learning a computer language represents a significant investment in time and effort, and because of the problem of training new staff when turnover occurs, only one or, at most, two languages should be introduced into an office.
Paulo Freire e o conceito de Cultura: contribuições para compreender a educação
Authors: Nishiwaki da Silva Alexandre Rodrigo
Published: July 2020

O presente artigo apresenta um conceito fundamental para as discussões sobre educação no interior do pensamento de Paulo Freire: cultura. Para tanto, lançamos mão da pesquisa bibliográfica e, a partir de autores/as que discutem este conceito, objetivamos compreender as relações estabelecidas entre ele e a educação. Em seguida, discutimos o conjunto de pensadores do espectro crítico-reprodutivistas da Sociologia da Educação que se empenharam em compreender a relação entre educação e cultura, apresentando suas contribuições e limitações. Por fim, apontamos como o conceito de cultura assume centralidade epistemológica nas ideias de Paulo Freire e permite análises privilegiadas da natureza dialógica da educação, superando as perspectivas anteriores, por estar organicamente ligados ao contexto sócio histórico.
Antonio Gramsci e a questão dos sindicatos: uma análise com ênfase nos escritos políticos
Authors: Taras Vaz Marta Rosani
Published: July 2020

Este artigo tem por objetivo principal apresentar elementos teóricos da obra de Antônio Gramsci que contribuem para uma concepção sobre o papel dos sindicatos. Para tanto, parte-se do pressuposto que os escritos gramsciano revelam o compromisso do pensamento do autor com o processo de transformação social. Neste sentido, buscaremos, num primeiro momento, indicar a noção de Estado ampliado em Gramsci, relacionando-o com o debate acerca da luta política e econômica. A partir de então, discorreremos, com base nos escritos políticos, sobre o papel dos sindicatos na perspectiva revolucionária. Por fim, indicaremos uma possível relação entre partidos, sindicatos e conselhos de fábrica no pensamento marxista deste intelectual italiano.
The Struggle for Law
Authors: Chiaramonte Xenia
Published: July 2020

The legal field constitutes both an advantageous and restrictive tool for social struggles. Current movements trust law and litigation as beneficial instruments. Nevertheless, legal strategies are deployed against protestors too. This article stems from processes of criminalization and unsuccessful “struggle for law” towards cases where legal strategies are embraced by social movements to demonstrate the Janus-faced nature of the legal field. The focus is on Italy, and is based on two-year judicial ethnography on the No TAV movement and fieldwork as well as documental analysis on the anti-Trans-Adriatic Pipeline (TAP) mobilization. Hence, the analysis focuses on a “positive” case selection, namely the most relevant climate litigation strategies pursued worldwide, with a special focus on Giudizio Universale, the first Italian action. The goal is to grasp both the conflicting aspects and the resourceful nature of law through empirical cases and case law to evaluate potential successful practices for current social movements.
Influence of methods of isolation of grafted grape cuttings on biological regularities of growth and development at open stratification
Authors: Иванченко Вячеслав Иосифович , Замета Олег Григорьевич , Зотиков Антон Юрьевич
Published: July 2020

В статье дается сравнительный анализ влияния различных способов защиты места соединения подвоя с привоем от подсыхания на прохождение этапов развития привитых черенков винограда во время стратификации. Установлено содержание влаги в привое, подвое и каллюсной ткани при открытом способе стратификации привитых черенков «на воде». Выявлены общие закономерности изменения содержания влаги в привойной части на разных этапах стратификации. Полная изоляция места соединения подвоя с привоем воском RebwachsPROи белой полиэтиленовой пленкой обеспечивает более высокий выход первосортных привитых черенков в сравнении с частичной изоляцией только места соединения подвоя с привоем пленкой. Установлено, что способ изоляции влияет на развитие привитых черенков во время стратификации. Применение воска RebwachsPRO способствует активному распусканию глазка на привое и росту побегов, а применение белой полиэтиленовой пленки, наоборот, сдерживает эти процессы.

The article gives a comparative analysis of the influence of various methods of protection of the junction of rootstock and scion from drying on the development stages of grafts during stratification. The moisture content in the rootstock, in grafted cutting and in the callus tissue with open method of stratification of grafts “on the water” was identified. General patterns of changes in moisture content in the scion area at different stages of stratification were revealed. Isolation of junction with RebwachsPRO® wax and white plastic polythene film provided higher output of first-class grafts compared to the partial isolating with the film of the inoculation junction only. It was found that the isolation method effects the development of grafted cuttings during stratification. The use of RebwachsPRO® wax promoted the active opening of eyes on the scion and growth of shoots, while the use of a white polythene film, on the contrary, restrained these processes.
Control of non-infectious chlorosis of grapes in Crimea
Authors: Алейникова Наталья Васильевна , Диденко Павел Александрович , Андреев Владимир Владимирович , Диденко Лиана Владимировна , Болотянская Елена Александровна
Published: July 2020

В статье приводятся результаты исследований 2017-2019 гг., проведенных в почвенно-климатических условиях Крыма, по контролю неинфекционного хлороза винограда на технических сортах путем применения железосодержащих минеральных удобрений. Экспериментально доказано, что использование препаратов Омекс Микромакс, Секвестрен Турбо и Хелат Fe при внекорневых подкормках виноградной лозы сортов Пино нуар и Алиготе привели к существенному снижению распространения и развития хлороза, в среднем на 10,5 и 5% соответственно. В ходе настоящих исследований при высоком уровне развития неинфекционного хлороза доказано положительное влияние минеральных удобрений на продуктивность виноградных растений: четырехкратное использование препарата Омекс Микромакс (сорт Пино нуар) позволило увеличить урожайность винограда на 10,9%; двукратное применение удобрения Секвестрен Турбо (сорт Алиготе) - на 12,9% в условиях Юго-западного Крыма. В условиях Южного берега Крыма внекорневые обработки микроудобрением Хелат Fe в фенологические фазы «после цветения» и «мелкая горошина» способствовали повышению урожайности винограда сорта Алиготе на 7,4%.

The article presents the results of studies, conducted in soil-climatic conditions of the Crimea in 2017-2019, on the control of non-infectious chlorosis of wine grape varieties by using iron-containing mineral fertilizers. The use of Omex Micromax, Sequestrene Turbo and Chelate Fe preparations for foliar dressing of ‘Pinot Noir’ and ‘Aligote’ vines led to a significant decrease in the expansion and progression of chlorosis, on average by 10.5 and 5%, respectively. During the studies and considering the high level of development of non-infectious chlorosis, the positive effect of mineral fertilizers on the productivity of grape plants was proved: four-time use of preparation Omex Micromax (‘Pinot Noir’ variety) increased the crop yield of grapes by 10.9%; two-time application of Sequestrene Turbo fertilizer (‘Aligote’ variety) - by 12.9% in the conditions of the south-west part of Crimea. In the conditions of the South Coast of Crimea foliar treatments with micronutrient fertilizer Chelate Fe in phenological phases “after flowering” and “berries pea-size” contributed to an increase in the yield of ‘Aligote’ grape variety by 7.4%.