bluuebunny/crossref_metadata_2025 huggingface dataset:
One-dimensional reference-beam LDV for accurate altitude estimation in a land vehicle
Authors: Huang Rong , Wang Qi , Nie Xiaoming , Zhou Jian
Published: October 2020

In order to provide accurate altitude information autonomously for land navigation, a self-developed one-dimensional reference-beam laser Doppler velocimeter (1D LDV) with light weight, small volume, and low cost is integrated with a strapdown inertial navigation system (SINS). The velocity sensed by the 1D LDV and the altitude output by the SINS are fused by the dead reckoning algorithm. Dynamic vehicle tests are carried out in an urban area with the altitude difference of 28 m and a mountainous area with the altitude difference of 1363 m. The horizontal positioning error and the altitude error are 10.8 m and 0.5 m in the urban area and 45.9 m and 3.6 m in the mountainous area. The experimental results illustrate that the developed SINS/1D LDV integrated navigation system is viable to provide highly accurate altitude as well as horizontal parameters in practical application.
Accuracy improvement of time-of-flight depth measurement by combination of a high-resolution color camera
Authors: Yu Pengfei , Yang Shourui , Chen Shengyong
Published: October 2020

Time-of-flight (ToF) cameras can acquire the distance between the sensor and objects with high frame rates, offering bright prospects for ToF cameras in many applications. Low-resolution and depth errors limit the accuracy of ToF cameras, however. In this paper, we present a flexible accuracy improvement method for depth compensation and feature points position correction of ToF cameras. First, a distance-error model of each pixel in the depth image is established to model sinusoidal waves of ToF cameras and compensate for the measured depth data. Second, a more accurate feature point position is estimated with the aid of a high-resolution camera. Experiments evaluate the proposed method, and the result shows the root mean square error is reduced from 4.38 mm to 3.57 mm.
Spatial wave control using a self-biased nonlinear metasurface at microwave frequencies
Authors: Kiani Mehdi , Momeni Ali , Tayarani Majid , Ding Can
Published: October 2020

Recently, investigation of metasurfaces has been extended to wave control through exploiting nonlinearity. Among all of the ways to achieve tunable metasurfaces with multiplexed performances, nonlinearity is one of the promising choices. Although several proposals have been reported to obtain nonlinear architectures at visible frequencies, the area of incorporating nonlinearity in form of passive-designing at microwave metasurfaces is open for investigation. In this paper, a passive wideband nonlinear metasurface is manifested, which is composed of embedded L−shape and Γ −shape meta-atoms with PIN-diode elements. The proposed self-biased nonlinear metasurface has two operational states: at low power intensities, it acts as a Quarter Wave Plate (QWP) in the frequency range from 13.24 GHz to 16.38 GHz with an Axial Ratio (AR) of over 21.2%. In contrast, at high power intensities, by using the polarization conversion property of the proposed PIN-diode based meta-atoms, the metasurface can act as a digital metasurface. It means that by arranging the meta-atoms with a certain coding pattern, the metasurface can manipulate the scattered beams and synthesize well-known patterns such as diffusion-like and chessboard patterns at an ultra-wide frequency range from 8.12 GHz to 19.27 GHz (BW=81.4%). Full-wave and nonlinear simulations are carried out to justify the performance of the wideband nonlinear metasurface. We expect the proposed self-biased nonlinear metasurface at microwave frequencies reveals excellent opportunities to design limiter metasurfaces and compact reconfigurable imaging systems.
Design of two invisibility cloaks using transmissive and reflective metamaterial-based multilayer frame microstructures
Authors: Jing Xufeng , Feng Dantian , Tian Ying , Li Meng , Chu Chengfei , Li Chenxia , He Yingwei , Gan Haiyong , Hong Zhi
Published: October 2020

Ultrathin metamaterials provide new possibilities for the realization of cloaking devices because of their ability to control electromagnetic waves. However, applications of metamaterials in cloaking devices have been limited primarily to reflection-type carpet cloaks. Hence, a transmissive free-space cloak was developed using a multilayer frame structure, wherein highly transparent metamaterials were used to guide incident waves into propagating around an object. The cloaking effect was quantitatively verified using near-field and far-field distributions. Metamaterials allow for the cloaking shells of transmissive cloaks to be developed without spatially varying extreme parameters. Moreover, a transmissive invisible cloak with metamaterial-based mirrors was designed. The design principle of this cloak with a frame structure consists of four metamaterial-based mirrors and two metal mirrors. After covered with the designed metamaterials-based mirrors cloak, the outgoing electromagnetic wave is restored greatly as if the wave passes directly through the obstacle without distortion. This cloak used the metamaterials mirrors to adjust the reflected angle, so that the outgoing electromagnetic wave does not change direction, thereby achieving the cloaking effect.
Enhanced terahertz focusing for a graphene-enabled active metalens
Authors: Huang Jianzhou , Guan Hongyu , Hu Bin , Wang Guocui , Liu Weiguang , Wang Zongyuan , Liu Juan , Zhang Yan , Wang Yongtian
Published: October 2020

Graphene-based terahertz (THz) metasurfaces have the advantages of ultra-small thickness, electrical tunability, and fast tuning speed. However, many such structures suffer low efficiency, especially for transmissive devices. Here we propose a hybrid structure for focusing THz waves with tunability and enhanced focusing efficiency, which is composed of a graphene-loaded metallic metasurface sandwiched by two mutually orthogonal gratings. Experimental results show that due to the multi-reflection between the metasurface layer and the grating layer, the focusing efficiency is enhanced by 1.8 times, and the focal length of the metalens is increased by 0.61 mm when the applied gate voltage on the graphene is increased from 0 V to 1.4 V. We hope the proposed structure may open a new avenue for reconfigurable THz metasurfaces with high efficiencies.
Experimental demonstration of advanced modulation formats for data center networks on 200 Gb/s lane rate IMDD links
Authors: Wei Jinlong , Rahman Talha , Calabrò Stefano , Stojanovic Nebojsa , Zhang Liang , Xie Changsong , Ye Zhicheng , Kuschnerov Maxim
Published: October 2020

This work contributes experimental demonstrations and comprehensive comparisons of various modulation and coding techniques for 200 Gb/s intensity modulation and direct detection links including four-level pulse amplitude modulation (PAM-4), PAM-6, trellis-coded modulation (TCM) over PAM and discrete multi-tone (DMT) transmission. Both C-band Mach-Zehnder modulator and O-band electro-absorption modulated laser transmitters were examined for intra-data center applications based on state-of-the-art commercial components.
Impact of thermo-optical effects in coherently combined multicore fiber amplifiers
Authors: Steinkopff Albrecht , Jauregui Cesar , Aleshire Christopher , Klenke Arno , Limpert Jens
Published: October 2020

In this work we analyze the power scaling potential of amplifying multicore fibers (MCFs) used in coherently combined systems. In particular, in this study we exemplarily consider rod-type MCFs with 2 × 2 up to 10 × 10 ytterbium-doped cores arranged in a squared pattern. We will show that, even though increasing the number of active cores will lead to higher output powers, particular attention has to be paid to arising thermal effects, which potentially degrade the performance of these systems. Additionally, we analyze the influence of the core dimensions on the extractable and combinable output power and pulse energy. This includes a detailed study on the thermal effects that influence the propagating transverse modes and, in turn, the amplification efficiency, the combining efficiency, the onset of nonlinear effect, as well as differences in the optical path lengths between the cores. Considering all these effects under rather extreme conditions, the study predicts that average output powers higher than 10 kW from a single 1 m long ytterbium-doped MCF are feasible and femtosecond pulses with energies higher than 400 mJ can be extracted and efficiently recombined in a filled-aperture scheme.
Membrane thinning and lateral gating are consistent features of BamA across multiple species
Authors: Liu Jinchan , Gumbart James C.
Published: October 2020

In Gram-negative bacteria, the folding and insertion of β-barrel outer membrane proteins (OMPs) to the outer membrane are mediated by the β-barrel assembly machinery (BAM) complex. Two leading models of this process have been put forth: the hybrid barrel model, which claims that a lateral gate in BamA’s β-barrel can serve as a template for incoming OMPs, and the passive model, which claims that a thinned membrane near the lateral gate of BamA accelerates spontaneous OMP insertion. To examine the key elements of these two models, we have carried out 45.5 μs of equilibrium molecular dynamics simulations of BamA with and without POTRA domains fromEscherichia coli,Salmonella enterica,Haemophilus ducreyiandNeisseria gonorrhoeae, together with BamA’s homolog, TamA fromE. coli, in their native, species-specific outer membranes. In these equilibrium simulations, we consistently observe membrane thinning near the lateral gate for all proteins. We also see occasional spontaneous lateral gate opening and sliding of the β-strands at the gate interface forN. gonorrhoeae, indicating that the gate is dynamic. An additional 14 μs of free-energy calculations shows that the energy necessary to open the lateral gate in BamA/TamA varies by species, but is always lower than the Omp85 homolog, FhaC. Our combined results suggest OMP insertion utilizes aspects of both the hybrid barrel and passive models.
Maritime Piracy in the Modern Era in Latin America
Authors: Kiss Amarilla
Published: October 2020

Maritime piracy is an activity that was considered defunct long ago and that Latin American countries experience it again in the 21st century. Since 2016 the number of attacks has increased dramatically involving armed robbery, kidnapping and massacre. Modern day piracy has nothing to do with the romantic illusion of the pirates of the Caribbean, this phenomenon is associated with the governmental, social or economic crisis of a state. When it appears, we can make further conclusions regarding the general conditions of the society in these states. But do these attacks really constitute piracy under international law? Does Latin American piracy have unique features that are different from piracy in the rest of the world? The study attempts to answer the questions why piracy matters in Latin America and how it relates to drug trafficking and terrorism. Apart from that, the study presents a legal aspect comparing the regulation of international law to domestic law, especially to the national law of Latin American states.
La política exterior de México en Asia
Authors: Maldonado Bodart Marcela , Laborde Carranco Adolfo Alberto
Published: October 2020

Las elecciones presidenciales de 2018 en México, marcaron un precedente histórico, con la victoria de Andrés Manuel López Obrador, en la presidencia. Aunque la política exterior en México está regulada a través de principios constitucionales, el cambio de paradigma hacia la llamada “Cuarta Transformación,” comprende nuevos procesos, en las estructuras, dentro del Estado. Con ello, se pretende modificar dinámicas, principalmente dentro de las instituciones, y sus diferentes actores, en el entramado político y económico, desde la perspectiva de la toma de decisiones y principales funciones. De ahí, que el presente trabajo, tiene como objetivo principal, identificar los intereses económicos de México que plantea el nuevo gobierno, para relacionarlos con la propuesta para las nuevas dinámicas de la política exterior. Se parte del supuesto, de que a pesar de que el nuevo gobierno pretende realizar una dinámica de diversificación política y económica en el exterior, aún no se materializan acciones concretas, en Asia, por ejemplo, con China, Japón y Corea del Sur; y con Estados Unidos, principal socio comercial, aunque se avanzó con los procesos de negociación del nuevo tratado comercial T-MEC, la capacidad política y posicionamiento del nuevo gobierno, frente a su principal socio comercial, no son claras en ninguna de sus aristas de cooperación. Por ello, el trabajo desarrolla una metodología descriptiva y analítica de las dinámicas del nuevo gobierno, considerando acciones y planteamientos de política exterior, frente a sus principales socios comerciales en Asia.
Educación superior y austeridad financiera en la era de la globalización
Authors: Guevara González Rosa Iris , Navarro Bernardo
Published: October 2020

En la presente ponencia abordaremos los principales determinantes del financiamiento a la educación superior en México en los años recientes para concluir en el año 2018. Ello forma parte de una investigación más amplia en proceso. El objetivo de nuestro trabajo es mostrar la contradicción entre la necesidad de adecuar y mejorar la educación para responder a los retos que plantea la globalización y en paralelo disminuir el apoyo financiero a la educación pública superior (EPS). Nos centraremos en este nivel educativo porque es el que está directamente vinculado con la generación de conocimiento, en una etapa histórica en que la competitividad de una nación está estrechamente relacionada con la generación de nuevo conocimiento. En México es en las instituciones públicas de educación superior y en los centros públicos de investigación en donde se crea la mayor parte del nuevo conocimiento. Y es en las instituciones públicas de educación donde se atiende a la mayor proporción de alumnos. Con el proceso de globalización los países que se han desarrollado son los que han invertido en educación y en específico en el nivel superior. Países en los que la educación forma parte de un proyecto de desarrollo nacional. Analizaremos lo anterior para el caso de mexicano.
“La instrucción es una cuestión de vida o muerte para la colonia”
Authors: Nagy Marcel
Published: October 2020

El artículo intenta presentar el papel de la instrucción en la conciencia de los valdenses que llegaron como inmigrantes al Uruguay desde mediados del siglo XIX. Según personajes de esas décadas como el Pastor Daniel Armand Ugon y otros, éste es un asunto de “vida o muerte”; se trata de encontrar la manera de conservar las tradiciones y cultura que habían llevado al Uruguay desde los valles del Piamonte.
Derecho humano al medio ambiente primera condena penal en Argentina
Authors: Borgarello Matias Ignacio
Published: October 2020

La aplicación de plaguicidas en predios cercanos a barrios poblados afecta gravemente la salud de la población residente, y en un fallo condenatorio ejemplar –en septiembre de 2012– la justicia penal cordobesa se expidió al respecto, sentencia confirmada tanto por el Tribunal Superior de Justicia de Córdoba como por la Corte Suprema de Justicia de la Nación el 12 de septiembre de 2017. La Cámara Primera del Crimen, entre sus considerandos advierte que el barrio Ituzaingó Anexo –afectado y objeto del fallo "Gabrielli Jorge Alberto y otros P.S.A. Infracción Ley 24.051"–, había sido declarado en emergencia sanitaria desde 2002 y quienes aplicaron los plaguicidas sabían que estaba vigente la emergencia sanitaria y que se registraba allí una delicada situación en materia de salud pública. La sentencia fue dictada en septiembre de 2012 y confirmada sucesivamente en 2015 y 2017.
Poesía cubana traducida por Joseph Brodsky
Authors: Sinitcyna Daria
Published: October 2020

El caso de Joseph Brodsky (1940-1996), premio Nobel de literatura, es un ejemplo del destino de un poeta en el universo soviético. Compartió con otros autores censurados la imposibilidad de expresarse con libertad a través de la poesía e, igual que B. Pasternak, O. Mandelshtam, M. Tsvetaeva y muchos más, recurrió a lo largo de los 60 a la traducción poética como recurso de sobrevivir pero también como una válvula de escape para la creación literaria. Tradujo autores ingleses, norteamericanos, polacos, yugoslavos, españoles, argentinos y en dos casos, cubanos. Se conocen las versiones rusas de poemas de Pablo Armando Fernández, Virgilio Piñera, Eugenio Florit y Ángel Augier realizadas por Brodsky. El análisis de estas traducciones supone el estudio del balance entre la coyuntura del momento histórico, la elección de los textos a traducir, la presencia del texto mediador (podstrochnik) y la relevancia del texto resultante para la cultura recipiente y revela varios aspectos importantes tanto de la obra de Joseph Brodsky como de las realidades de la escritura y la traducción en la época socialista.
Montaigne y el ensayo del Nuevo Mundo
Authors: Weinberg Liliana
Published: October 2020

Se estudia la estrecha relación entre ensayo y Nuevo Mundo. La preocupación por América está ya presente en la obra de Montaigne, y a la vez el ensayo se hace presente cada vez con mayor fuerza en el mundo americano. La propia figura de Montaigne fue objeto de admiración y reflexión por parte de muchos de los principales ensayistas en esta región. Se revisan algunas de las consideraciones de varios de los mayores representantes del pensamiento y el ensayo latinoamericano en torno a Montaigne para mostrar que, a pesar de que han sido frecuentemente desatendidos por la crítica especializada, constituyen aportes sustantivos a los estudios montaigneanos.
Análisis de necesidades de formación continua de directores de tesis para la tutoría de estudiantes de doctorado
Authors: Escolástica Macias Gomez , Lago de Fernandez Carmen Cecilia , José Luis Aguilera Garcia , Lago de Vergara Diana
Published: October 2020

El desarrollo progresivo, sostenible y equitativo de los países sólo es posible si en ellos se ofrece una educación con calidad (ONU, 2018), entendida como propiedades que se manifiestan en acciones cualificadas. Por tanto, la buena calidad es intrínseca al nivel de formación de quienes realizan acciones altamente especializadas para el aprovechamiento de las riquezas de un país. Esto exige compromisos importantes de las Instituciones de Educación Superior, especialmente, en la formación de docentes investigadores.
     En este artículo se destaca la importancia de la formación de los profesores para las tutorías de las tesis doctorales  y se expone parte de un proyecto de investigación cuyo objetivo es identificar necesidades de formación continua de los directores de tesis doctorales; concretamente, en la Universidad de Cartagena de Indias. La finalidad del estudio es determinar lineamientos que orienten el diseño e implantación de un programa de formación continua para fortalecer conocimientos y habilidades investigativas de directores de tesis doctoral sobre procedimientos, métodos y técnicas de investigación científica actualizados. El programa que proponemos es exigente, sistemático e internacional, congruente con el entorno mundial, procurando un trabajo interinstitucional y con proyección en la mejora para el logro de ciudades inclusivas, seguras, resilientes y sostenibles.
Effect of Nickel Concentration in Natural Zeolite as
Catalyst in Hydrocracking Process of Used Cooking Oil
Authors: usi E.P. S , Wijaya K. , Wangsa  , Pratika R.A. , Hariani P.L.
Published: October 2020

Zeolites impregnated with Ni were successfully synthesized through wet impregnation using activated
natural zeolites (ANZs) and the nickel nitrate hexahydrate (Ni(NO3)2·6H2O) precursor at different
concentrations of 1%, 2% and 3% (w/w) (hereafter referred to as ANZ/Ni 1%, ANZ/Ni 2%, and
ANZ/Ni 3%). The synthesized products were characterized using X-ray diffraction (XRD), Fourier
transform infrared spectroscopy (FTIR), surface area analyzer (SAA), scanning electron microscopy
(SEM), total acidity measurements by employing ammonia adsorption and Brunauer-Emmett-Teller
(BET) theory. The obtained catalysts were employed in the hydrocracking of waste cooking oils, and
the formed products were analyzed through gas chromatography-mass spectrometry (GC-MS). The
FTIR results indicated that ANZs impregnated with Ni can increase zeolite acidity. The test results of
total acidity revealed that 3% ANZ/Ni catalyst exhibited the maximum total acidity of 3.70 mmol/g.
XRD diffractogram confirmed the successful impregnation of Ni into ANZs, which was indicated by
the characteristic diffraction peaks appearing at 2θ of 9.75º, 13.41º, 19.56º, 22.25º, 25.61º, 27.66º and
31.91º. SEM analysis indicated that the particle size of zeolite catalysts was non-uniform, but these
catalysts exhibited a highly uniform surface after they were activated. Moreover, the ANZ catalysts
impregnated with different concentrations of Ni exhibited a highly uniform particle size. The ANZ/Ni
3% catalyst had small uniform particle. The BET results revealed that the ANZ/Ni 2% catalyst exhibited
the maximum pore volume and surface area and relatively smaller radii of pores. GC-MS was employed
to determine liquid products, and its results showed that the ANZ/Ni 3% catalyst had the maximum
amount of liquid products of 18%.
Computational Design, Spectral, NBO, DOS, Bioactivity Evaluation, ADMET Analysis,
Third-Order non-linear Optical and Quantum Chemical Investigations on Hydrogen
Bonded Novel Organic Molecular Complex of 4-[Bis[2-(acetyloxy)ethyl]amino]benzaldehyde (4B2AEAB) Derivatives for Opto-Electronic Applications
Authors: Kumar Ashutosh , Mishra Anil
Published: October 2020

In this paper, the authors reported a theoretical investigation on molecular structure, geometry
optimization, global and local chemical reactivity descriptors calculations, NBO study, DOS,
non-linear optical behaviour and vibrational wavenumbers of the novel 4-[bis[2-
(acetyloxy)ethyl]amino]benzaldehyde (4B2AEAB) were carried out by DFT (B3LYP and B3PW91)
methods with 6-31+G (d, p) basis set in water solvent. The calculated vibrational wavenumbers are
found to be in good agreement with experimental FT-IR spectra and PED analysis using GaussView
5.0 and VEDA 4 program. The UV-Vis absorption spectrum of 4B2AEAB was calculated by using
TD-DFT/B3LYP/6-31+G(d,p) in gas phase, water, CHCl3, DMSO and CH2Cl2 solvents using CPCM
model and λmax in range of 354.16, 341.35, 343.74, 342.18 and 342.64 nm, respectively. The density of
state (DOS spectrum) of the compound in term of HOMOs and LUMOs and MESP were calculated
and analyzed. The temperature effects on the thermodynamic properties are also discussed. The
calculated 1H NMR and 13C NMR chemical shift using GIAO method and solvent effect are investigated
by B3LYP/6-31+G(d,p) in gas phase, chloroform, water, DMSO and CH2Cl2 solvents and correlate
with experimental chemical shifts. The dipole moment, polarizability and the first static
hyperpolarizability values show that the 4B2AEAB molecule is active non-linear optical (NLO)
material. The nucleophilic and electrophilic reactive sites in the 4B2AEAB and its derivatives were
analyzed by Fukui function analysis using Mulliken charge. The charge transfer, conjugative interactions
and delocalization of electron density are analyzed by natural bond orbital (NBO) analysis. The
biological properties and ADMET study of 4B2AEAB and its derivatives are also discussed.
A QSAR Modeling on Aurone Derivatives as Antimalarial Agents
Authors: Hadanau R.
Published: October 2020

A quantitative structure activity relationship (QSAR) analysis was performed on several compound and aurone derivatives (1-16) and 17-21 compounds were used as internal and external tests, respectively. Studies have investigated aurone derivatives; however, for aurone compounds, QSAR analysis has not been conducted. The semi-empirical PM3 method of HyperChem for Windows 8.0 was used to optimise the aurone derivative structures to acquire descriptors. For 15 influential descriptors, the multilinear regression MLR analysis was conducted by employing the backward method, and four new QSAR models were obtained. According to statistical criteria, model 2 was the optimum QSAR model for predicting the inhibition concentration (IC50) theoretical value against novel aurone derivatives. The modelling of 40 (22-61) aurone compounds was achieved. Six novel compounds (54, 55, 58, 59, 60, and 61) were synthesized in a laboratory because the IC50 of these compounds was lower than that of chloroquine (IC50 = 0.14 μM).
‘With these exhibits many interesting things can be learned about past times’: Playmobil’s History Class – representations, reflections and expectations
Authors: Barsch Sebastian , Mathis Christian
Published: October 2020

In 2018, the toy manufacturer Playmobil launched a ‘History Class’ as an addition to its ‘Furnished School Building’. The materiality of this toy, and the selection of teaching media represented in coloured plastic (a blackboard with timeline, magnifying glass, parchment roll, stone axe, posters and other sources), convey an idea of history education based on hands-on learning, a variety of methods, original encounters and work with historical sources. This paper presents results of an international research project in which 12 children in Germany and Switzerland were interviewed with the help of this toy as a stimulus. The aim was to find out to what extent children are able to deconstruct the toy as a historical-cultural product. In addition, the interviews were intended to grasp the children’s views on the ideal teaching of history. The data are evaluated using grounded theory methodology. The results show that the pupils express clear wishes as to how history teaching should be structured. A critical distance to the toy was not taken.
What aspects of historical understanding feature in the analysis of moving-image sources in the history classroom?
Authors: Cutajar Alexander
Published: October 2020

This paper reflects on aspects of historical understanding developed in a classroom in which moving-image sources are analysed. Considered as non-fictional representations of the past, moving-image sources comprised broadcast images of historical events on newsreels, news broadcasts and documentaries. The study, carried out in a Maltese state secondary school, involved students (aged 15/16 years) analysing moving images as historical sources in their history lessons. Various aspects of understanding were identified: making connections with media content; using knowledge of one topic to shape another; discussing forms of historical knowledge in relation to each other; connecting with the wider historical picture; and constructing meaning using various language strategies. It is argued that these aspects offer a characterization of historical understanding when analysing broadcast footage of historical events in a constructivist classroom. It is suggested that underlying these aspects was students’ prior historical knowledge. I highlight the importance of maximizing on opportunities provided by moving-image sources to support understanding, particularly the co-construction of knowledge.
Perancangan PC Game First Person Shooter Menggunakan Unreal Development Kit
Authors: Afif Rizka Lukmana , Satoto Kodrat Iman , Martono Kurniawan Teguh
Published: October 2020

The development of hardware increasing rapidly has made game developers take advantage of a variety of new resources that can improve their games. Epic games is a mature game developer who managed to make thousands game and delivered to the hands of gamers . A game engine called Unreal Engine is a big secret behind the success of Epic Games . The game engine is free if you just want to learn or just want to create a personal project and the game is not to be in comercial purposes . It is unfortunate that many students don’t even know of the existence of unreal engine , most of them make use of simpler game engine like game maker , rpg maker , fps creator , and so on. Though unreal engine is superior in any aspect other than the game engine , be it graphics , tools , mechanisms of development , flexible in export-import assets , etc . Based on this information , the author had the idea to make a first person shooter game using the unreal engine as the engine game. Before doing the develpment process, the next step is studying the literature of unreal engine and other supporting software such as 3d studio max to create 3D assets , adobe flash to create the menus , adobe photoshop to create a 2D texture and speedtree assets to create the foliage elements . The next thing is to go into the design phase of scenarios , maps, missions , characters and items that will be placed in the game. The next stage is the development and testing phase to test the game that has finished .The results of the design of this game is the realization of a first person shooter game application using unreal engine with features that can support the player 's interest in playing the game . It’s also introducing unreal engine to students who are interested in designing games.
Pembuatan Portal Kegiatan Perkuliahan Bagi Dosen Sistem Komputer UNDIP
Authors: Widowati Dyah Mustika Nency , Satoto Kodrat Iman , Martono Kurniawan Teguh
Published: October 2020

In any lectures, the lecturer must fill journal lectures. Journal of the activity is used to determine the subject matter of the lecture material delivered. In addition as an evaluation if there is material that has not been delivered. Each journal lectures will be always monitored by the Head of the Department to meet its obligations if the lecturers in teaching or not. In the process of implementation, all lectures still be entered manually using paper. It made less cumbersome and complicates monitoring of the Head of Department to monitor any lectures . So the need for making the portal lectures to assist monitoring and lectures journal entry. Making these lectures portals using PHP programming language and MySQL database . As well as using the waterfall method and blackbox testing . Waterfall method includes user requirements, analysis, design, implementation and testing. Blackbox testing is used to test the program without the test of functional design specifications and program code. Used also Entity Relationship Diagram, Data Flow Diagram and in the design of the information system. The results of the application design in the form of web-based desktop application, which is easier for professors to fill any lectures that have been done , knowing the schedule of lectures and the material that was presented at each meeting. As well as Head of the Department to facilitate monitoring any existing faculty.
Perancangan Dan Implementasi Teknologi Virtual Reality Modelling Language 3 Dimensi Pada Pengenalan Perangkat Keras Komputer Berbasis Website
Authors: Sahardevi Zaskia Wiedya , Nurhayati Oky Dwi , Martono Kurniawan Teguh
Published: October 2020

The purpose of this research is to design and implement the technology of Virtual Reality Modeling Language (VRML) 3D) on the introduction of computer hardware websites based. Steps design of multimedia applications for learning media computer hardware is done by performing data collection, literature review, analysis and system design followed by implementation and testing of the system. In this research using a black-box test method, where the acknowledgment is made to test the success of the exist functions. The result of the design of this application is a web based interactive applications in the desktop containing material computer hardware and visualized in 3D VRML form of a variety of input devices, output, processing, and storage devices. In addition, the animation demo mode petrified to get to know more computer hardware.
Perancangan dan Pengembangan Permainan Jelajah Indonesia Berbasis iOS Menggunakan GameSalad
Authors: Kurniawan Arsi , Satoto Kodrat Iman , Kridalukmana Rinta
Published: October 2020

Indonesia is the largest archipelago in the world is made up of thousands of islands. Even in each island, the Indonesian people have a variety of ethnic, regional languages and different customs. And of course in every region in Indonesia has the characteristic of each, ranging from traditional foods, folk song, a mainstay of tourism, and unique customs. It is inevitable because of the vast territory of Indonesia and the many traits that exist in each region as mentioned above, it is no wonder that most Indonesian people themselves do not know the area well characteristic of their own region and other areas. Therefore, it is developing the game Exploration of Indonesia as a medium to introduce the characteristic of regions in Indonesia is through game-based mobile devices iOS. The game is built using GameSalad. Multimedia development method that used is the Multimedia Development Life Cycle (MDLC) from initial concept through distribution determination. For the method of application testing using Black Box Test. The results of this study in the form of an application with the name of the game Exploration of Indonesia that can run well on iOS-based mobile devices. This games can be a media campaign for characteristic of regions in Indonesia, both for citizens of Indonesia itself or to a foreign national who indirectly promote Indonesia to the international
Perancangan Aplikasi Permainan Let’s Say dengan Interaksi Pengenalan Ucapan
Authors: Dewanta Andhika , Isnanto R. Rizal , Martono Kurniawan Teguh
Published: October 2020

Computer games has been widespread. Currently, almost all devices that have a screen can play the game with the experience of interactivity to entertain the public. The game does not always have a negative effect. Game application that has a learning function will be useful and easily accepted by society. This study was conducted to determine how computer games can be a fun medium of information and learning by making use of speech recognition interaction. The application development of this "Let's Say" game is done by using the method of multimedia development consisting stages of concept, design, material collection, implementation, testing, and distribution. The design of the application is done using UML modeling and ERD. Application development is done using Visual Basic.NET programming language, WPF system interface, and SQLite database. Application utilizes Windows Speech Recognition as a speech recognition engine. Functional testing of the application is done using black box methods. Applications testing to users is done through a questionnaire. The test results showed that the application works well according to functions that has been specified. Application testing to users indicate that the application is informative and easy to use with a view that is quite interesting. Tests also showed that the use of speech recognition has been going well and helpful.
Rodzina naturalna a rodzina zastępcza. Pojęcia, podobieństwa i różnice
Authors: Walancik-Ryba Karolina
Published: October 2020

Walancik-Ryba Karolina, Rodzina naturalna a rodzina zastępcza. Pojęcia, podobieństwa i różnice [Natural Family and Foster Family. Concepts, Similarities and Differences]. Studia Edukacyjne nr 56, 2020, Poznań 2020, pp. 297-307. Adam Mickiewicz University Press. ISSN 1233-6688. DOI: 10.14746/se.2020.56.16The article “Natural Family and Foster Family. Concepts, Similarities and Differences” covers the problem of defining the terms: the family and the foster family. The author compares these concepts, focusing on the similarities and differences between the two. Based on the issues related to these concepts, she attempts to define the concept of the foster family.
Factors for Chinese Students Choosing Poland Higher Education
Authors: Diao Rui
Published: October 2020

Diao Rui, Factors for Chinese Students Choosing Poland Higher Education [Czynniki skłaniające chińskich studentów do wyboru polskiego szkolnictwa wyższego]. Studia Edukacyjne nr 56, 2020, Poznań 2020, pp. 421-434. Adam Mickiewicz University Press. ISSN 1233-6688. DOI: 10.14746/se.2020.56.23As the world’s second largest economy, China has attracted extensive attention from the rest of the world in various aspects. Education, as a way to export talent, has always been valued by the world. Although China’s education industry is growing, many Chinese students still choose to study abroad. China is one of the world’s leading exporters of international students. Poland, located in Europe, has a clean educational environment, advanced European knowledge and unique cultural charm. In recent years, Sino-Polish relations have grown so close that studying in Poland will be a good choice for Chinese students. This article mainly introduces the admission of Chinese elite universities and the study and life of Chinese students in Poland.
Seniorzy w cyberprzestrzeni. Między stereotypem a rzeczywistością
Authors: Błeszyńska Krystyna M. , Orłowska Małgorzata
Published: October 2020

Błeszyńska Krystyna M., Orłowska Małgorzata, Seniorzy w cyberprzestrzeni. Między stereotypem a rzeczywistością [Seniors in Cyberspace. Between Stereotype and Reality]. Studia Edukacyjne nr 56, 2020, Poznań 2020, pp. 153-166. Adam Mickiewicz University Press. ISSN 1233-6688. DOI: 10.14746/se.2020.56.8Today, stereotypically seniors are assigned many negative traits. One of them is their lack of digital competences, which in consequence leads to their exclusion from modern social life. Given that modern Western societies are rapidly aging, this problem is becoming a social issue that needs to be addressed. A significant part of society must not be allowed to live as outcasts. In this situation, a question arises whether contemporary seniors are definitively excluded, or is age not an apparent premise in their case, and the problem lies elsewhere? The analysis of the collected empirical material revealed that the variable determining the level and type of social participation in virtual society is not age, but the level of education. Therefore, contrary to the prevailing views, seniors are not at risk of information exclusion and it is difficult to consider them as digital immigrants. Contrary to stereotypes, seniors are more distant, selective and pragmatic; independence allows them not to imitate culture and lifestyles, but to create them in contrast to the generation of their grandchildren.
Tempura
Authors: Wang Zuozhi , Zeng Kai , Huang Botong , Chen Wei , Cui Xiaozong , Wang Bo , Liu Ji , Fan Liya , Qu Dachuan , Hou Zhenyu , Guan Tao , Li Chen , Zhou Jingren
Published: October 2020

Incremental processing is widely-adopted in many applications, ranging from incremental view maintenance, stream computing, to recently emerging progressive data warehouse and intermittent query processing. Despite many algorithms developed on this topic, none of them can produce an incremental plan that always achieves the best performance, since the optimal plan is data dependent. In this paper, we develop a novel cost-based optimizer framework, called Tempura, for optimizing incremental data processing. We propose an incremental query planning model called TIP based on the concept of time-varying relations, which can formally model incremental processing in its most general form. We give a full specification of Tempura, which can not only unify various existing techniques to generate an optimal incremental plan, but also allow the developer to add their rewrite rules. We study how to explore the plan space and search for an optimal incremental plan. We evaluate Tempura in various incremental processing scenarios to show its effectiveness and efficiency.
An analysis of concurrency control protocols for in-memory databases with CCBench
Authors: Tanabe Takayuki , Hoshino Takashi , Kawashima Hideyuki , Tatebe Osamu
Published: October 2020

This paper presents yet another concurrency control analysis platform, CCBench. CCBench supports seven protocols (Silo, TicToc, MOCC, Cicada, SI, SI with latch-free SSN, 2PL) and seven versatile optimization methods and enables the configuration of seven workload parameters. We analyzed the protocols and optimization methods using various workload parameters and a thread count of 224. Previous studies focused on thread scalability and did not explore the space analyzed here. We classified the optimization methods on the basis of three performance factors: CPU cache, delay on conflict, and version lifetime. Analyses using CCBench and 224 threads, produced six insights. The performance of optimistic concurrency control protocol for a read-only workload rapidly degrades as cardinality increases even without L3 cache misses. (I2) Silo can outperform TicToc for some write-intensive workloads by using invisible reads optimization. (I3) The effectiveness of two approaches to coping with conflict (wait and no-wait) depends on the situation. (I4) OCC reads the same record two or more times if a concurrent transaction interruption occurs, which can improve performance. (I5) Mixing different implementations is inappropriate for deep analysis. (I6) Even a state-of-the-art garbage collection method cannot improve the performance of multi-version protocols if there is a single long transaction mixed into the workload. On the basis of I4, we defined the read phase extension optimization in which an artificial delay is added to the read phase. On the basis of I6, we defined the aggressive garbage collection optimization in which even visible versions are collected. The code for CCBench and all the data in this paper are available online at GitHub.
Damascius on Self-Constituted Realities
Authors: Vlad Marilena
Published: October 2020

This article analyzes the concept ofself-constitutionin Damascius’ treatisesDe principiisandIn Parmenidem. On the one hand, I try to see how self-constitution functions within the framework of reality. I identify the different levels of self-constituted reality (τὸ αὐθυπόστατον), showing that each of these levels is also constituted by the absolute One, which is the cause of all things. Self-constitution is present throughout the process in which the One is slowly in labor towards plurality, starting from the highest level of intelligible being down to the level of the particular soul. On the other hand, I also try to show how self-constitution appears at a discursive level. In this context I discuss its crucial role in Damascius’ interpretation of the second and third hypotheses in Plato’s dialogueParmenides.
Sclerostin and osteoprotegerin: new markers of chronic kidney disease mediated mineral and bone disease in children
Authors: Guven Sercin , Gokce Ibrahim , Cicek Neslihan , Yaman Ali , Vatansever Pinar , Alpay Harika
Published: October 2020

Background

Sclerostin and osteoprotegerin (OPG) are new markers of chronic kidney disease (CKD) mediated mineral bone disease (CKD-MBD) which were extensively evaluated in adult population. We aimed to evaluate the associations between serum levels of sclerostin/OPG and parameters of bone turnover and compare the serum levels of sclerostin/OPG in different stages of CKD in children.

Methods

70 children with CKD stage 1-5, aged 2-21 years were examined. Serum levels of alkaline phosphatase (ALP), creatinine, total calcium, phosphorus , intact parathyroid hormone (iPTH) and vitamin D were measured. Serum sclerostin and OPG levels were measured in children with different levels of CKD stage and their association with bone turnover parameters were noted.

Results

We did not observe any significant correlation between serum levels of sclerostin and OPG and stages of CKD. A negative relationship was present between serum sclerostin and 25-OH vitamin D levels. Osteoprotegerin was positively and significantly correlated with ALP but serum sclerostin was negatively correlated with ALP.

Conclusion

Our study, which includes only children and adolescents with a growing skeleton under uremic conditions and excluding diabetes and atherosclerosis interference, is very valuable. We couldn't find any significant relationship between either sclerostin or OPG levels among different stages of CKD. Also our study demonstared a strong negative relationship between ALP and sclerostin levels and a strong positive relationship between ALP and OPG levels, reminding the importance of ALP levels to predict the bone-mineral status of the children with CKD.
A 24-segment fractional shortening of the fetal heart using FetalHQ
Authors: Hata Toshiyuki , Koyanagi Aya , Yamanishi Tomomi , Bouno Saori , Takayoshi Riko , Mostafa AboEllail Mohamed Ahmed , Miyake Takahito
Published: October 2020

Objectives

To evaluate 24-segment fractional shortening (FS) of the fetal heart using FetalHQ by speckle-tracking regarding reproducibility and the change with advancing gestation.

Methods

Eighty-one pregnant women at 18–21+6 and 28–31+6 weeks of gestation were studied using FetalHQ with the speckle-tracking technique to calculate 24-segment FS of left and right ventricles. Intra- and inter-class correlation coefficients and intra- and inter-observer agreements of measurements for FS were assessed in each segment.

Results

With respect to intra-observer reproducibility, all FS values showed correlations between 0.575 and 0.862 for the left ventricle, with good intra-observer agreements except for left ventricular segments 14–24. Right ventricular FS values showed correlations between 0.334 and 0.685, with good intra-observer agreements. With respect to inter-observer reproducibility, all FS values showed correlations between 0.491 and 0.801 for the left ventricle, with good intra-observer agreements except for left ventricular segments 16–22. Right ventricular FS values showed correlations between 0.375 and 0.575, with good inter-observer agreements. There were significant differences in the mean FS values in the basal segment (segments 1–5) of the left ventricle between 18 and 21+6 and 28–31+6 weeks of gestation (p<0.05), whereas there were significant differences in all mean FS values in the right ventricle between both gestational ages (p<0.05).

Conclusions

These results suggest that the reproducibility of the 24-segment FS of the fetal heart using FetalHQ is fair. However, there may be significant differences in FS values with advancing gestational age, especially for the right ventricle.
Usefulness of COVID-19 screen-and-test approach in pregnant women: an experience from a country with low COVID-19 burden
Authors: Šterbenc Anja , Premru Sršen Tanja , Lučovnik Miha , Vidmar Šimic Marijana , Steblovnik Lili , Fabjan Vodušek Vesna , Druškovič Mirjam , Kavšek Gorazd , Poljak Mario , Trojner Bregar Andreja
Published: October 2020

Objectives

Information on the usefulness of screen-and-test strategies of pregnant women for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is lacking.

Methods

We retrospectively reviewed the Ljubljana Maternity Hospital database and searched for pregnant women, who were admitted to the hospital between March 15 and May 16, 2020, for a planned procedure or hospitalization. Their medical records were examined and SARS-CoV-2 test results were retrieved.

Results

During the two-month period analyzed, there were a total of 265 scheduled admissions of pregnant women to our hospital. Two hundred two (76.2%) were tested for SARS-CoV-2 1 day prior to admission. All tested negative for SARS-CoV-2 RNA, regardless of having coronavirus disease 2019 (COVID-19)-compatible signs or symptoms (n=28) or not (n=174).

Conclusions

In a population with a low SARS-CoV-2 burden, usefulness of universal testing of pregnant women before admission to the hospital is limited. We recommend that obstetric units in regions with low SARS-CoV-2 burden enforce rational use of personal protective equipment and diligent screening protocols using targeted questionnaires, whereas SARS-CoV-2 laboratory testing should be performed only in screen-positives: those with high clinical suspicion of COVID-19 and/or suspected epidemiological history.