bluuebunny/crossref_metadata_2025 huggingface dataset:
The Zambian Preterm Birth Prevention Study (ZAPPS): Cohort characteristics at enrollment
Authors: Castillo Marcela C. , Fuseini Nurain M. , Rittenhouse Katelyn , Price Joan T. , Freeman Bethany L. , Mwape Humphrey , Winston Jennifer , Sindano Ntazana , Baruch-Gravett Courtney , Chi Benjamin H. , Kasaro Margaret P. , Litch James A. , Stringer Jeffrey S. A. , Vwalika Bellington
Published: July 2019

Background: Sub-Saharan Africa bears a disproportionate burden of preterm birth and other adverse outcomes. A better understanding of the demographic, clinical, and biologic underpinnings of these adverse outcomes is urgently needed to plan interventions and inform new discovery. 

Methods: The Zambian Preterm Birth Prevention Study (ZAPPS) is a prospective observational cohort established at the Women and Newborn Hospital (WNH) in Lusaka, Zambia. We recruit pregnant women from district health centers and the WNH and offer ultrasound examination to determine eligibility. Participants receive routine obstetrical care, lab testing, midtrimester cervical length measurement, and serial fetal growth monitoring. At delivery, we assess gestational age, birthweight, vital status, and sex and assign a delivery phenotype. We collect blood, urine, and vaginal swab specimens at scheduled visits and store them in an on-site biorepository. In September 2017, enrollment of the ZAPPS Phase 1—the subject of this report—was completed. Phase 2, which is limited to HIV-uninfected women, reopened in January 2018. 

Results: Between August 2015 and September 2017, we screened 1784 women, of whom 1450 (81.2%) met inclusion criteria and were enrolled. The median age at enrollment was 27 years (IQR 23–32) and median gestational age was 16 weeks (IQR 13–18). Among women with a previous pregnancy (n=1042), 19% (n=194) reported a prior miscarriage.  Among parous women (n=992), 41% (n=411) reported a prior preterm birth and 14% (n=126) reported a prior stillbirth. The HIV seroprevalence was 24%.

Discussion: We have established a large cohort of pregnant women and newborns at the WNH to characterize the determinants of adverse birth outcomes in Lusaka, Zambia. Our overarching goal is to elucidate biological mechanisms in an effort to identify new strategies for early detection and prevention of adverse outcomes. We hope that findings from this cohort will help guide future studies, clinical care, and policy.
Long-term in toto cell tracking using lightsheet microscopy of the zebrafish tailbud
Authors: Fulton Timothy , Lenz Martin O. , Muresan Leila , Andrews Toby , Lancaster Courtney , Horton Elizabeth , Steventon Benjamin
Published: July 2019

In toto light-sheet imaging allows the tracking of entire growing tissues with high spatial and temporal resolution for many hours. However, this technology requires a sample to be immobilised to ensure that the tissue of interest remains within the field of view throughout the image acquisition period. We have developed a method of mounting and image capture for long-term light-sheet imaging of a growing zebrafish tailbud from the 18 somite stage through to the end of somitogenesis. By tracking the global movement of the tailbud during image acquisition and feeding this back to the microscope stage, we are able to ensure that the growing tissue remains within the field of view throughout image acquisition. Here, we present three representative datasets of embryos in which all nuclei are labelled and tracked until the completion of somitogenesis.
About the Science «Geometry of Technical Objects»
Authors: Лепаров Михаил , Leparov M.
Published: July 2019

The work proposes the development of the science "Geometry of technical objects" as an interdisciplinary science, which is a part of the sciences "Geometry" and "Design of technical objects". The object of the science is the geo metrical design, and its subject is the determination of the geometry of assembly units and parts in terms of the functions they perform. The co mponents of science are examined: tasks; laws, regularities, principles and rules; methods and terminology. The existing science of "Geometry", part of mathematics, explores spatial structures and relationships, as well as their generalizations, but does not consider the relationship between geometry and functions of real technical objects. There are many developments that are associated with the geometry (especially the shape) of important details of specific types sorockyj units, however, the studies that discuss the General questions of geometry invariant with respect to the types (names) of Assembly units available, but their number is negligible and they can be presented as General guidelines. The exceptional importance and the possibility of a common approach allow us to offer the formation of specific geometry, which refers to real technical objects (Assembly units and flying). Geometry plays a fundamental role in the functioning of technical objects, so it is especially important to look for common approaches to its (geometry) disclosure. The geometry of technical objects can also be considered as an opportunity to transform the main content of graphic disciplines in technical universities.
Modeling Approximating the 16-Point Compartment the Response Surface With Respect To the Solution of the Inhomogeneous Heat Equation
Authors: Конопацкий Евгений , Konopatskiy Evgeniy
Published: July 2019

The paper proposes a computational method for solving differential equations of mathematical physics by approximating the desired solution using geometric objects of multidimensional space passing through predetermined points. The essence of the method is to simulate an approximating geometric object of a multidimensional affine space constructed on a regular multidimensional network of points. In this case, the response function values satisfying the solution of the original differential equation are calculated at the nodal points of the network. Modeling of approximating geometric object is carried out by means the arcs of algebraic curves passing through predetermined points. It should be noted that taking into account the boundary conditions does not require changes in the geometric algorithm or point equations. It is sufficient to use the necessary coordinates of the nodal boundary points corresponding to the boundary conditions of the solution of the differential equation. To achieve the required accuracy of the solution of differential equations, it is sufficient to compact the reference network of points. Under such conditions, it is possible to use as a single geometric object to approximate the solution of the differential equation, and composite, based on the simulation of multidimensional contours on a regular network of points of multidimensional space. A geometric classification of differential equations depending on the number of parameters determining the approximating geometric object in multidimensional space is proposed. An example of solving the inhomogeneous heat equation by means of an approximating response surface passing through 16 predetermined points is given. In this case, the required approximating compartment of the response surface passes through 3 straight lines that correspond to the boundary conditions and satisfies the solution of the original differential equation at the nodal points of the 16-point network. A comparison of the results of solving the inhomogeneous heat equation approximated by a 16-point compartment of the response surface with the reference compartment of the surface obtained by the method of separating variables is also presented.
A Geometrical Model Producing a Surface Equivalent To the Working Surface of the Gear Tool «Hob»
Authors: Рязанов С. , Ryazanov S.
Published: July 2019

Existing mathematical models for calculating worm gearing [34; 38] are quite complex and do not always provide an opportunity to quickly and accurately obtain the desired result [1; 3; 24–26]. A simpler way to find a suitable gearing option that satisfies the task is using computer simulation methods and computer graphics, and in particular solid modeling algorithms [4; 5; 30–33; 36; 37]. This information can be entered into the computer in order to simulate control of the movement of the cutting tool. Ultimately, this boils down to the problem of analytic description and computer representation of curves and surfaces in three-dimensional space [18–20]. Despite the diversity and good development of the calculation methods, and the analysis of the geometrical parameters of the worm gear, there is a lack of means and methods for displaying the process of forming the working surfaces of the worm gear elements [28; 29; 41]. There are no computer algorithms for obtaining the producing surfaces of a worm cutter, which are obtained by a tool with a modified producing surface. A change in the geometric shape of the tool producing surface will lead to a change in the working surfaces of the worm wheel and turns of the worm, which may lead to an improvement in their contact. This article shows the application of the developed methods and algorithms of geometric and computer modeling, which are designed to form the helical surface of the turns of the worm and the teeth of the worm wheel. Their use will speed up the process of calculating intermediate adjustments of machines used for cutting worm gears, bypassing complex mathematical calculations that, under conditions of aging of the gear-cutting machine fleet, their wear and inevitable reduction in the accuracy of their kinematic chains. This can be achieved only by applying a deliberate modification of the contacting surfaces, which reduces the sensitivity of the worm gear to the manufacturing errors of its elements, which allows to maintain the quality of the gears produced at a sufficiently high level.
Comparação das estimativas de atividade física e comportamento sedentário em adultos brasileiros no VIGITEL e PNS, Brasil, 2013
Authors: Mendes Graciele Ferreira de Ferreira , Häfele Vítor , Blumenberg Cauane , Werneck André Oliveira , Radicchi Marcelo Rocha , Coll Carolina de Vargas Nunes , Bielemann Renata Moraes
Published: July 2019

O objetivo do presente estudo foi comparar as estimativas de atividade física e comportamento sedentário obtidas pelos inquéritos nacionais VIGITEL e PNS. Foram utilizados dados do VIGITEL 2013 e PNS 2013, conduzidos entre adultos (≥ 18 anos). Os desfechos foram: atividade física no lazer, deslocamento ativo para o trabalho, inatividade física no lazer e tempo de televisão. Sexo, idade, escolaridade e índice de massa corporal foram as variáveis independentes. Para a estatística, utilizou-se proporções (IC95%) e Coefciente de Correlação de Concordância de Lin (CCC). As estimativas de deslocamento ativo para o trabalho e de tempo de TV apresentaram concordância moderada entre os inquéritos (CCC = 0,515; CCC = 0,478, respectivamente), enquanto as estimativas de atividade física no lazer e inatividade no lazer apresentaram concordância baixa (CCC = 0,060; CCC = 0,054, respectivamente). As estimativas obtidas entre os inquéritos PNS e VIGITEL sobre desfechos relacionados à atividade física e comportamento sedentário foram de concordância moderada a baixa, não sendo os resultados obtidos comparáveis.
Systemic neoadjuvant chemotherapy in modern pancreatic cancer treatment: a systematic review and meta-analysis
Authors: Rangarajan K , Pucher PH , Armstrong T , Bateman A , Hamady ZZR
Published: July 2019

Background

Pancreatic ductal adenocarcinoma remains a disease with a poor prognosis despite advances in surgery and systemic therapies. Neoadjuvant therapy strategies are a promising alternative to adjuvant chemotherapy. However, their role remains controversial. This meta-analysis aims to clarify the benefits of neoadjuvant therapy in resectable pancreatic ductal adenocarcinoma.

Methods

Eligible studies were identified from MEDLINE, Embase, Web of Science and the Cochrane Library. Studies comparing neoadjuvant therapy with a surgery first approach (with or without adjuvant therapy) in resectable pancreatic ductal adenocarcinoma were included. The primary outcome assessed was overall survival. A random-effects meta-analysis was performed, together with pooling of unadjusted Kaplan–Meier curve data.

Results

A total of 533 studies were identified that analysed the effect of neoadjuvant therapy in pancreatic ductal adenocarcinoma. Twenty-seven studies were included in the final data synthesis. Meta-analysis suggested beneficial effects of neoadjuvant therapy with prolonged survival compared with a surgery-first approach, (hazard ratio 0.72, 95% confidence interval 0.69–0.76). In addition, R0 resection rates were significantly higher in patients receiving neoadjuvant therapy (relative risk 0.51, 95% confidence interval 0.47–0.55). Individual patient data analysis suggested that overall survival was better for patients receiving neoadjuvant therapy (P = 0.008).

Conclusions

Current evidence suggests that neoadjuvant chemotherapy has a beneficial effect on overall survival in resectable pancreatic ductal adenocarcinoma in comparison with upfront surgery and adjuvant therapy. Further trials are needed to address the need for practice change.
Importância do apoio familiar no período gravídico-gestacional sob a perspectiva de gestantes inseridas no PHPN
Authors: Avanzi Samara Alves , Dias Carlos Alberto , Silva Leonardo Oliveira Leão e , Brandão Marileny Boechat Frauches , Rodrigues Suely Maria
Published: July 2019

O presente estudo tem por objetivo analisar a percepção de gestantes sobre a importância do apoio familiar no período gravídico-gestacional, tendo como referência as vivências daquelas cadastradas no Sistema de Informação do Pré Natal (SISPRENATAL). Trata-se de estudo observacional, descritivo, de corte transversal quantiqualitativo, com dados coletados em entrevistas domiciliares realizadas junto a 80 gestantes inseridas no Programa de Humanização no Pré Natal e Nascimento (PHPN) a partir de 2016, na cidade de Governador Valadares/MG. A maioria (62,6%), das gestantes possui idade entre 20 e 30 anos, é casada ou vive em união estável (73,7%), tendo a maior parte o ensino fundamental completo ou médio incompleto (42,4%), seguida pelo grupo que possui o ensino médio completo ou superior incompleto (36,3%). A maioria (83,8%) recebeu apoio familiar ao longo da gestação manifestando interesse em serem acompanhadas durante o parto (70,0%) preferencialmente pelo marido/convivente (48,4%) ou pessoa que possui vivência de parto como a mãe (17,2%). Há dependência entre receber apoio ou ser acompanhada às consultas realizadas na Estratégia de Saúde da Família (ESF) e desejar que um familiar esteja presente durante o parto. A maioria das entrevistadas possui percepção positiva sobre apoio recebido bem como valorizam positivamente o envolvimento familiar neste contexto.
Outcome Assessment of Open Foot Injuries in A Teaching Hospital in Ghana
Authors: Konadu-Yeboah Dominic , Konadu Peter , Darkwa Ampem , De-gaulle Virtue Fiawokome , Smith Holdbrook , Quansah Robert Ekow
Published: July 2019

Purpose
Foot injuries are common in low- and middle-income countries and continue to increase in incidence due to the surge in the use of motorcycles as means of transport.Yet, there is scanty data on the incidence and outcomes of treatment of open injuries to the foot in the developing world.We aimed to determine the incidence and functional outcomes of open foot injuries that are treated in a teaching hospital in Ghana.

Methods
We used a structured questionnaire to record the type of open foot injury, the mechanism of injury, any concomitant injuries, the time interval between injury and arrival at the hospital for treatment as well as the type of treatment instituted.

Recruited patients were followed up for six months, complications resulting from the injury or its treatment were recorded for each patient. The function of the foot after healing of the injury was measured using a questionnaire-based visual analogue outcome scale of the American Foot and Ankle Society. Regression and chi-square analysis were used to evaluate potential associations.

Results
Over a four-month period, a total of 81 cases of open injuries to the foot were recorded. Out of this figure, 55 patients (67.9%) were males and 26 (32.1%) were females. It was found, that 66.7% aged between 19 and 49 years, 76.5% of the injuries occurred on the road and 29.7% was motor cycle related. Pedestrians are the most afflicted (61.7%). The treatment outcomes of traumatic amputations, open phalangeal fractures, dorsal skin degloving and lacerations were good. Gustillo-Anderson grade IIIB open fractures with associated plantar skin degloving had the worst outcomes with residual pain on weight bearing, bigger foot, inability to wear previous shoes and inability to tiptoe on the affected foot.

Conclusions
Open injuries to the foot are common in Ghana and exert a significant health burden, particularly on active young males. Long term disability may occur, even after adequate treatment of open fractures involving the foot.
Novel Methylated DNA Markers Discriminate Advanced Neoplasia in Pancreatic Cysts: Marker Discovery, Tissue Validation, and Cyst Fluid Testing
Authors: Majumder Shounak , Taylor William R. , Yab Tracy C. , Berger Calise K. , Dukek Brian A. , Cao Xiaoming , Foote Patrick H. , Wu Chung Wah , Mahoney Douglas W. , Aslanian Harry R. , Fernández-Del Castillo Carlos , Doyle Leona A. , Farrell James J. , Fisher William E. , Lee Linda S. , Lee Yvonne N. , Park Walter , Rodrigues Clifton , Gould Rothberg Bonnie Elyssa , Salem Ronald R. , Simeone Diane M. , Urs Sumithra , Van Buren George , Smyrk Thomas C. , Allawi Hatim T. , Lidgard Graham P. , Raimondo Massimo , Chari Suresh T. , Kendrick Michael L. , Kisiel John B. , Topazian Mark D. , Ahlquist David A.
Published: July 2019

OBJECTIVES:

Pancreatic cystic lesions (PCLs) may be precancerous. Those likely to harbor high-grade dysplasia (HGD) or pancreatic cancer (PC) are targets for surgical resection. Current algorithms to predict advanced neoplasia (HGD/PC) in PCLs lack diagnostic accuracy. In pancreatic tissue and cyst fluid (CF) from PCLs, we sought to identify and validate novel methylated DNA markers (MDMs) that discriminate HGD/PC from low-grade dysplasia (LGD) or no dysplasia (ND).

METHODS:

From an unbiased whole-methylome discovery approach using predefined selection criteria followed by multistep validation on case (HGD or PC) and control (ND or LGD) tissues, we identified discriminant MDMs. Top candidate MDMs were then assayed by quantitative methylation-specific polymerase chain reaction on archival CF from surgically resected PCLs.

RESULTS:

Of 25 discriminant MDMs identified in tissue, 13 were selected for validation in 134 CF samples (21 cases [8 HGD, 13 PC], 113 controls [45 ND, 68 LGD]). A tree-based algorithm using 2 CF-MDMs (TBX15, BMP3) achieved sensitivity and specificity above 90%. Discrimination was significantly better by this CF-MDM panel than by mutant KRAS or carcinoembryonic antigen, with areas under the receiver operating characteristic curve of 0.93 (95% confidence interval: 0.86–0.99), 0.71 (0.57–0.85), and 0.72 (0.60–0.84), respectively. Cutoffs for the MDM panel applied to an independent CF validation set (31 cases, 56 controls) yielded similarly high discrimination, areas under the receiver operating characteristic curve = 0.86 (95% confidence interval: 0.77–0.94, P = 0.2).

DISCUSSION:

Novel MDMs discovered and validated in tissue accurately identify PCLs harboring HGD/PC. A panel of 2 MDMs assayed in CF yielded results with potential to enhance current risk prediction algorithms. Prospective studies are indicated to optimize and further evaluate CF-MDMs for clinical use.
A Novel Method of Esophageal Remodeling: Thinking Outside the Box
Authors: Kochhar Rakesh , Ashat Munish , Reddy Yalaka Rami , Gulati Ajay , Lileswar Kaman , Sinha Saroj Kant
Published: July 2019

Caustic esophageal strictures are complex strictures with high rates of recurrence and complications. Management of these strictures requires a multipronged approach including endoscopic dilation and complex surgeries. Even with these modalities, treatment of each patient has to be individualized because it requires high clinical discretion. We present a 38-year-old female woman who had required esophagostomy and total gastrectomy in the acute phase after caustic ingestion. The definitive surgical procedure was deferred because of cicatrization of the proximal esophageal remnant. We remodeled scarred esophagus using a novel technique, which facilitated definitive surgery.
More Than a Rash: Recurrent Hepatocellular Carcinoma After Liver Transplantation
Authors: Moraveji Sharareh , Pedersen Mark R. , Chandramouli Shruti , Kerr Thomas A. , Grant Lafaine M.
Published: July 2019

Recurrent hepatocellular carcinoma (HCC) after liver transplant is uncommon in patients who have favorable pretransplant characteristics. We present a 56-year-old man with a history of liver transplant 8 weeks prior for hepatitis C cirrhosis and HCC who presented for shortness of breath. He was found to have a microangiopathic hemolytic anemia and an erythematous, nodular skin rash on his left lower abdomen. Biopsy of the skin rash would demonstrate metastatic HCC, determined to be the cause of hemolysis as well. Recurrent malignancy should be considered in patients with a history of HCC who present with new, unexplained skin nodules.
The Light at the End of the Tunnel
Authors: Mando Rufaat , Ceballos Darrel , Kumar Manoj , Abdul-Rahim Osama , Mizrahi Meir
Published: July 2019

Approximately 5%–10% of common bile duct (CBD) stones cannot be removed by conventional methods because of altered anatomy. Percutaneous transhepatic cholangioscopic lithotomy has been cited as a viable alternative. A 69-year-old woman with a history of Roux-en-Y was found to have a lesion obstructing the CBD. A cholangioscope was advanced through a percutaneous transhepatic sheath and demonstrated an obstructing stone in the CBD that was removed with lithotripsy. The rate of successful stone removal with percutaneous transhepatic cholangioscopic lithotomy is 90%, with complication rates similar to endoscopic retrograde cholangiopancreatography and is an option in patients with altered surgical anatomy.
Successful Recanalization of a Long-Segment Complete Esophageal Stricture Using Endoscopic and Fluoroscopic Techniques
Authors: Lam Steven , Deivert Duane E. , Obuch Joshua C.
Published: July 2019

Complete esophageal strictures are rare complications in patients who have received head and neck radiation therapy. Although mild strictures are generally amenable to dilation or stenting, management of these debilitating strictures is not well established. Treatment of long-segment obstructions is particularly complicated because documented techniques generally apply for strictures up to 3 cm in length. This report describes a successful recanalization of a long-segment complete esophageal stricture using combined antegrade-retrograde endoscopic therapy with adjunctive fluoroscopic techniques.
DYNAMIC SMART GRID COMMUNICATION PARAMETERS BASED COGNITIVE RADIO NETWORK
Authors: Haider Haider Tarish , Muhsen Dhiaa Halboot , Shahadi Haider Ismael , See Ong Hang , Elmenreich Wilfried
Published: July 2019

The demand for more spectrums in a smart grid communication network is a significant challenge in originally scarce spectrum resources. Cognitive radio (CR) is a powerful technique for solving the spectrum scarcity problem by adapting the transmission parameters according to predefined objectives in an active wireless communication network. This paper presents a cognitive radio decision engine that dynamically selects optimal radio transmission parameters for wireless home area networks (HAN) of smart grid applications via the multi-objective differential evolution (MODE) optimization method. The proposed system helps to drive optimal communication parameters to realize power saving, maximum throughput and minimum bit error rate communication modes. A differential evolution algorithm is used to select the optimal transmission parameters for given communication modes based on a fitness function that combines multiple objectives based on appropriate weights. Simulation results highlight the superiority of the proposed system in terms of accuracy and convergence as compared with other evolution algorithms (genetic optimization, particle swarm optimization, and ant colony optimization) for different communication modes (power saving mode, high throughput mode, emergency communication mode, and balanced mode).
FABRICATION OF Mg-Zn-Al HYDROTALCITE AND ITS APPLICATION FOR Pb2+ REMOVAL
Authors: Heraldy Eddy , Rahmawati Fitria , Ardiyanti Dwi , Nurmawanti Ika
Published: July 2019

The fabrication of Mg-Zn-Al Hydrotalcite (HT) was carried out by the co-precipitation method at various molar ratios. The Mg-Zn-Al HT compound at the optimum molar ratio was then calcined to determine the effect of calcination on the Pb2+ adsorption. The kinetics of the adsorption type was determined by applying pseudo first order and pseudo second order kinetics models. Meanwhile, to investigate the adsorption process, the Freundlich and Langmuir equations were applied to determine the adsorption isotherm. The results showed that the optimum Mg-Zn-Al HT was at a molar ratio of 3 : 1 : 1 with an adsorption efficiency of 73.16 %, while Mg-Zn-Al HT oxide increased the adsorption efficiency to 98.12 %. The optimum condition of Pb2+ removal using Mg-Zn-Al HT oxide was reached at pH 5 and a contact time of 30 minutes. The adsorption kinetics follows the pseudo second order kinetics model with a rate constant of 0.544 g/mg·min. The isotherm adsorption follows the Langmuir isotherm model with a maximum capacity of 3.916 mg/g and adsorption energy of 28.756 kJ/mol.
CYLINDRICAL ROLLER BEARING LUBRICATION REGIMES ANALYSIS AT LOW SPEED AND PURE RADIAL LOAD
Authors: Chmelař Jakub , Petr Karel , Mikeš Petr , Dynybyl Vojtěch
Published: July 2019

In this article, we describe a method of the roller bearing lubrication regime prediction. It uses a mathematical model of the bearing based on the standard ISO/TS 16281 to obtain the external load distribution over the rolling elements. We consider the effects of press fit and thermal gradient etween bearing rings on the internal clearance. The model is limited to an input of an uni-axial radial load and it neglects the centrifugal forces and gyroscopic moments due to its application for the region of low speeds. The lubrication film thickness is evaluated for the most loaded rolling element by a numerical solution of Reynolds’ equation for the line contact. The assessment of the lubrication regime takes into the account the surface roughness by employing the lubrication coefficient as an output parameter. Presented outcomes of the study, based on the measured geometry of the bearing, show the importance of an appropriate lubricant selection for the application.
Development of Urban Electric Bus Drivetrain
Authors: Sivkov Oleg , Musalek Lubomir Musalek , Novak Jaroslav , Novak Martin , Chysky Jan , Novak Lukas
Published: July 2019

The development of the drivetrain for a new series of urban electric buses is presented in the paper. The traction and design properties of several drive variants are compared. The efficiency of the drive was tested using simulation calculations of the vehicle rides based on data from real bus lines in Prague. The results of the design work and simulation calculations are presented in the paper.
Summary of the Modern Wheel Slip Controller Principles
Authors: Pichlík Petr
Published: July 2019

Railway traction vehicles need to transfer high tractive effort from wheels to rails. The task is complicated because the maximum transferable force continuously changes during the train run, and the change can lead to the high wheels slip velocity or slippage. The effects are undesirable and must be prevented if it is possible or at least limited by slip controllers. There have been several slip controllers developed based on different principles with different degree of complexity and efficiency. The paper summarises principles of the slip control methods and brings their overview with the simulation of their behaviour.
Ubiquitous Learning Environment and Technologies: A Review
Authors: Mohd Tahir Zurainee , Haron Haryani , Kaur Jasber
Published: July 2019

In recent years, the education landscape is rapidly changing due to the advancement of information and communication technology infrastructure. The paradigm shift in educational landscape has changed the learner’s behaviors from passive to active in their learning process. Ubiquitous learning is a new learning environment that integrates the benefit of e-learning and mobile learning. The technology plays an important role in supporting ubiquitous learning and a proper technology configuration to obtain learning information is a must. The support for those technology needs in ubiquitous learning is coming from computer-based technologies. The aim of the paper is to performed literature review for ubiquitous learning environment and providing specific information about ubiquitous learning concepts and the criteria that needed in the future research. It begins by briefly describing the transformation of learning environment, the concepts of ubiquitous learning, the characteristics of ubiquitous learning, the technical structure of ubiquitous learning and ubiquitous technologies devices in ubiquitous learning environment is also described. Finally, the comparative studies of ubiquitous learning environment framework are compared and discussed to further enhance the understanding of ubiquitous learning environment. The result showed that technology usage is vital within learners and educators in learning process. Therefore, it is important to have a medium that can be used to improve learning process to be more effective and the most important part to take a look for before implementing new technology into academic learning is the readiness of the infrastructure.
Predicting Stock Market Index Using Hybrid Intelligence Model
Authors: Nadirah Mohd Johari Sarah , Husna Muhamad Farid Fairuz , Afifah Enara Binti Nasrudin Nur , Sarah Liyana Bistamam Nur , Syamira Syamimi Muhammad Shuhaili Nur
Published: July 2019

Predicting financial market changes is an important issue in time series analysis, receiving an increasing attention due to financial crisis. Autoregressive integrated moving average (ARIMA) model has been one of the most widely used linear models in time series forecasting but ARIMA model cannot capture nonlinear patterns easily. Generalized autoregressive conditional heteroscedasticity (GARCH) model applied understanding of volatility depending to the estimation of previous forecast error and current volatility, improving ARIMA model. Support vector machine (SVM) and artificial neural network (ANN) have been successfully applied in solving nonlinear regression estimation problems. This study proposes hybrid methodology that exploits unique strength of GARCH + SVM model, and GARCH + ANN model in forecasting stock index. Real data sets of stock prices FTSE Bursa Malaysia KLCI were used to examine the forecasting accuracy of the proposed model. The results shows that the proposed hybrid model achieves best forecasting compared to other model.
Combined Economic and Emission Dispatch Solution using Artificial Bee Colony Algorithm with Fuzzy Approach
Authors: N. Abdullah M , Y. Sim G , Azmi A , H. Shamsudin S
Published: July 2019

The cost and emission minimization in power system operation become important issue in power dispatch due to increase of environmental pollution and fossil fuel price. Therefore, combined economic and emission dispatch (CEED) must be considered in generation scheduling in order to provide balanced solution for optimal cost and emissions level of power generation. In this paper, an Artificial Bee Colony (ABC) algorithm with Fuzzy best compromise solution is proposed to determine the optimal cost and emission level by converting the multi-objective (cost and emission) into single objective problem using weighted sum method approach. The best compromise solution among Pareto front solution was determined by fuzzy approach. The effectiveness of ABC algorithm has been validated in terms of the best solution, convergence behaviour and consistency for power system benchmark such as IEEE 30-bus 6-unit system and 10-unit system. The comparison study shows that ABC algorithm capable to obtain a better performance of minimizing the cost and emission level in power generation.
Real-Time Internet Based Attendance Using Face Recognition System
Authors: Wati Mohamad Yusof Yuslinda , Asyraf Mohd Nasir Muhammad , Azura Othman Kama , Izwan Suliman Saiful , Shahbudin Shahrani , Mohamad Roslina
Published: July 2019

This project focuses on face recognition implementation in creating fully automated attendance system with a cloud. Cloud services will provide a useful information regarding the attendance such as attendance summary performance and visualizing the data into graph and chart. In this study, we aim to create an online student attendance database, interfaced with a face recognition system based on raspberry pi 3 model B. A graphical user interface (GUI) will provide ease of use for data analysis on the attendance system. This work used open computer vision library and python for face recognition system combined with SFTP to establish connection to an internet server which runs on PHP and Node.js. The results showed that by interfacing a face recognition system with a server, a real-time attendance system can be built and be monitored remotely.
Turbogenerator: Part 1: Simulation
Authors: Yu. Lezhnev Lev , P. Tatarnikov Alexey , A. Skvortsov Arсady , A. Papkin Igor , S. Nekrasov Aleksandr
Published: July 2019

The article describes the process of developing a turbogenerator for power plants of small and distributed power generation. The analysis of the component base for the turbogenerator was carried out, and thereof a comparative analysis of possible technical solutions was conducted. The work considered the installation variants of a turbogenerator in the exhaust system, an electric machine of a turbogenerator, types of turbines of a generator. A mathematical model for computation of the output effective and geometric parameters of a turbogenerator was described. The results of computational analysis were presented, and the parameters of the turbogenerator being developed were selected. Based on the results of the work done the conclusions were made
Informal Text Analytics at the Interface of Theoretical Research and Education
Authors: Sorina Galina , . .
Published: July 2019

This article consists of a theoretical and a practical part. The theoretical part focuses on the ideas of informal text analytics (ITA) and the methodology for expert text analysis (META). I examine these ideas at the interface of theoretical research and education. I show that Aristotle’s works on logic transcend formal analytics – i.e. logic – to enter the realm of informal analytics. I prove this hypothesis through exploring Aristotle’s analysis of question and question/answer procedures (QAP). I emphasise that, when discussing the problem of formulating questions, Aristotle suggests that not only the formal procedures of proof and argumentation but also the characteristics of persons posing questions should be taken into account. The latter builds a bridge between Aristotle’s vision and informal text analytics. The practical part comprises the syllabus that I prepared for a relevant course. The syllabus outlines the ways to wed both avenues of analytics.
Enhancing gain of dual band antenna for Wi-Fi/WiMAX applications using array technique
Authors: Taha Sediq Hiwa
Published: July 2019

This study describes the design of dual rectangular microstrip patch antenna for Wi-Fi and WiMAX wireless communication applications. In this work, the technique of design array patch antennas was used in order to improve the physical antenna characteristics for Wi-Fi and WiMAX device. As a result, the proposed technique causes to increase the gain and directivity of the antenna. Using this method also leads to enhance measurement bandwidth of antenna and some other antenna parameters as mentioned in this research paper. A dual-band microstrip patch antenna is developed for WiMAX/Wi-Fi wireless applications that operate at a minimum frequency of 2.4 GHz and a maximum frequency band of 3.5 GHz with its dimensions is L= 88.27 mm, W= 171.4 mm and h= 1.67 mm. The achieved parameters of dual patch array antenna for 2.4 GHz and 3.5 GHz are (gain of 8.25 dB, directivity of 10.4 dBi, measurement bandwidth of 65.82 MHz and measurement return loss of -20.86 dB) and (gain of 7.56 dB, directivity of 8.76 dBi, measurement bandwidth of 98.96 MHz and measurement return loss of -21.38 dB) respectively.
Automotive braking system simulations V diagram approach
Authors: V. Gowda Dankan , A C Ramachandra , M N Thippeswamy , C Pandurangappa , Naidu P Ramesh
Published: July 2019

This Paper focus, on the different stages associated with the advancement of Automobile Braking Control system. Different V-Models (SIL, MIL, HIL, and DIL) are contrasted with the proposed V model for Hydraulic antilock braking system. The main objective of this research is to enable various loop simulations used in a variety of automotive industries, in order to analyze the performance of different safety functions. A vehicle model is used to represent a real vehicle in a model-based environment. Vehicle model is a sophisticated component, which makes use of two wheeler dynamics concepts to achieve a real vehicle behavior. In this research, an attempt is made to elaborate the various automotive simulations used starting from model in loop simulation to Driver in loop Simulation approaches followed by a V-diagram approach to develop the product. Here an ABS controller is taken as an example model for simulation.
Mobile Barcode Based Examination Attendance System
Authors: Ullah Khan Rehman , Chua Yee Wee Vivian , Wong Sze Lui Valentina , Inam UlHaq Much. , Khan Yahya , Hardyman Barawi Mohd
Published: July 2019

Smartphone usage has revolutionized the world to many settings including that of the education system with numerous potential and realized benefits. While the functions of smartphones, such as text messaging, multimedia, and Internet connectivity, may seem purely recreational, they can be used within the academic institution to manage students attendance to speed up the process of taking attendance by academic instructors, hence reduces time, human errors and redundant works as compared to the manual attendance system. In this paper, we introduced an automatic examination attendance system on smartphones based on the Barcode to automatically capture student examination attendance. Although many existing systems (Sudha et al. 2015) have been proposed using smartphones for automatic student attendance, there is little study known about a system that is specifically designed for capturing student examination attendance. The main difference among our system and existing systems is that existing systems are using extra hardware device Barcode reader while our system is using smartphone, which highly reduce the cost. Our experiment shows that our proposed student examination attendance system is better for capturing the student attendance information during the examination as compared to the general student attendance systems.
A Review on Short-Term Prediction of Air Pollutant Concentrations
Authors: Fauzi Raffee Ahmad , Nazahiyah Rahmat Siti , Abdul Hamid Hazrul , Ismail Jaffar Muhammad
Published: July 2019

In the attempt to increase the production of the industrial sector to accommodate human needs; motor vehicles and power plants have led to the decline of air quality. The tremendous decline of air pollution levels can adversely affect human health, especially children, those elderly, as well as patients suffering from asthma and respiratory problems. As such, the air pollution modelling appears to be an important tool to help the local authorities in giving early warning, apart from functioning as a guide to develop policies in near future. Hence, in order to predict the concentration of air pollutants that involves multiple parameters, both artificial neural network (ANN) and principal component regression (PCR) have been widely used, in comparison to classical multivariate time series. Besides, this paper also presents comprehensive literature on univariate time series modelling. Overall, the classical multivariate time series modelling has to be further investigated so as to overcome the limitations of ANN and PCR, including univariate time series methods in short-term prediction of air pollutant concentrations.
Indoor Fungal Growth on Variable Antifungal at Different Wall Finishing on Plasterboard
Authors: M.Sunar N , Subramaniam M , F. Zulkifly N , K. Parjo U , M. Er C , M. Leman A , Khalid A , F. Shaari M , H. Abdul Rashid A , Zaidi E , T.S. Azhar A
Published: July 2019

Various health complaints often been attributed to pollution and the poor quality of the indoor air. If there is good practice in building design, construction, and maintenance, the structures should remain dry. However, when there is moisture damage, the materials may be in contact with water for prolonged times, which inevitably leads to microbial growth or even total deterioration of the building material. Antimicrobial coating is designed to generate a surface that is easy to clean and can also incorporate active agents, commonly called antifungal, that prevent microbial colonization, the subsequent growth and bio-deterioration of the substrate. This paper presents the sustainable treatment for indoor environment quality in buildings by examining the application of potassium sorbate, zinc salicylate, and calcium benzoate that used as food industry preservatives as indoor antimicrobial agents. Four types of wall finishing used on plasterboard substrate: acrylic paint, glycerol based-paint, thin wallpaper, and thick wallpaper. The result indicated that potassium sorbate is the best bio compound to react as antifungal agent to prohibit the growth of indoor fungi. All the antifungal shows difference level of their effectiveness from each other. Only 40% of fungi were able to grow on thin wallpaper by using potassium sorbate as antifungal agent.
Knowledge, Attitude and Practices of Musculoskeletal Disorder Injuries from Malaysian Industries Employers’ Perspective
Authors: Nadia Nordin Athirah , Mohd. Rohani Jafri , Zainal Abidin Noesheila , Md. Zein Raemy , Amira Mat Zuki Anis
Published: July 2019

This study aims to assess the level of Knowledge, Attitude and Practices (KAP) on Musculoskeletal disorders (MSDs) from employers’ perspectives in Malaysia industries. A newly developed KAP questionnaire was distributed and answered by 45 employers. Most employers showed good scores in the majority of items in Knowledge, Attitude and Practices sections. Pearson correlation was used in order to test the relationship between KAP scores and demographic profile and also KAP variables. It was found that knowledge has strong correlation r=0.291, p>0.05 with gender. The attitude component has a strong correlation (r=0.344, p>0.05) with age group. Whereas the practices component has good correlation with education level (r=0.249, p>0.05). However, the KAP variables show only knowledge and practices have a strong correlation (r=0.271, p>0.05). MSDs cases are increasing hence understanding the underlying KAP factors are crucial in order to tackle the problem.
Total Quality Management Planning Model to Increase Higher Education Performance and Competitiveness
Authors: Sutanto Aftoni , . Widodo , Bidayati Utik
Published: July 2019

Improving higher education performance increases competitiveness and customer satisfaction. The purpose of this research is to design a Total Quality Management (TQM) planning model to increase higher education performance and competitiveness. The focus of this research are the formulation of strategic planning for the implementation of TQM, the formulation of the operational planning, the application of the quality management, and the system of quality control in private higher education. The results of this this research is demonstrates that a national standard and a quality assurance system for higher education are used as the basis for the formulation of a quality management strategy. The formulation of TQM planning model was directed by ISO 9001 instrument, the accreditation form of The National Accreditation Board for Higher Education, and The Independent Accreditation Institution. The significant components in the implementation of TQM planning model are: a quality assurance instrument and the implementation of quality management actors, an understanding of quality management by all parties in higher education, benchmarking, education and training in quality management, leadership, reward and punishment, evaluation process, and an Integrated Management Information System. There are two roles quality control systems in private HE. These are: internal and external quality control.
Analysis of the Addition e Node B in 4G LTE Network for Coverage Area
Authors: Ulfah Maria , . .
Published: July 2019

As the number of LTE 4G network subscribers increases, telecom operators must expand their coverage area to be able to serve the telecommunications needs of customers. Research on 4G LTE is still interesting to be studied because 4G LTE network is still developed.This study discusses the effect of the addition of e Node B to the coverage area of 4G LTE network. The research method used is survey, simulation. This research is done by taking data of telecommunication operator in north Balikpapan. From the research results for the 4G LTE network need to add 4 e Node B from 14 to 18 e Node B. By addition of e Node B number increased coverage area of 4G LTE network from 89.108 km2 to 132 km2
The Influence of Entrepreneurship Capability to Micro and Small Business Growth in Indonesian Fish Processing Industry
Authors: Ratnaningtyas Sudrajati , Sutardi Acip , Makbul Yogi
Published: July 2019

This study aims to measure the entrepreneurship capability and its influence on business growth in the fish processing industry which is a supporter of the culinary industry. There are three dimensions of entrepreneurship capability included in the model: entrepreneurial skills, management skills, and technical skills, with each factor. The research was conducted in fish production center in West Java Indonesia, in 2017. The research method used was survey method by Two-Stage Cluster Random sampling technique; and used primary and secondary data. Data analysis technique used Compound Annual Growth Rate (CAGR) to measure business growth, and Structural Equation Model (SEM) to analyze the influence of entrepreneurship on business growth. The results showed that communication, ability to take risk, innovative, change-oriented, persistent, proactiveness, committed, planning and goal setting, decision making, motivating, marketing, inner control, design, environment observation, critical path method, work break down structure are indicators appropriate to be a measure of entrepreneurial capability, especially for micro and small business manager. Entrepreneurship capability significantly influenced business growth at 95 percent confidence level. It means that when entrepreneurship capability is improved it will increase the business growth rate of micro and small business in the fish-based food processing industry in Indramayu Regency.