bluuebunny/crossref_metadata_2025 huggingface dataset:
Inpainting CMB maps using partial convolutional neural networks
Authors: Montefalcone Gabriele , Abitbol Maximilian H. , Kodwani Darsh , Grumitt R.D.P.
Published: March 2021

We present a novel application of partial convolutional neural networks (PCNN) that can inpaint masked images of the cosmic microwave background. The network can reconstruct both the maps and the power spectra to a few percent for circular and irregularly shaped masks covering up to  10% of the image area. By performing a Kolmogorov-Smirnov test we show that the reconstructed maps and power spectra are indistinguishable from the input maps and power spectra at the 99.9% level. Moreover, we show that PCNNs can inpaint maps with regular and irregular masks to the same accuracy. This should be particularly beneficial to inpaint irregular masks for the CMB that come from astrophysical sources such as Galactic foregrounds. The proof of concept application shown in this paper shows that PCNNs can be an important tool in data analysis pipelines in cosmology.
Parameters estimation and strong gravitational lensing of nonsingular Kerr-Sen black holes
Authors: Ghosh Sushant G. , Kumar Rahul , Islam Shafqat Ul
Published: March 2021

The recent time witnessed a surge of interest in strong gravitational lensing by black holes is due to the Event Horizon Telescope (EHT) results, which suggest comparing the black hole lensing in both general relativity and heterotic string theory. That may help us to assess the phenomenological differences between these models. Motivated by this, we consider gravitational lensing by the nonsingular Kerr-Sen black holes, which encompass Kerr black holes as a particular case, to calculate the light deflection coefficients p and q in strong-field limits, while the former increases with increasing parameters k and charge b, later decrease. We also find a decrease in the light deflection angle αD, angular position θ∞ decreases more slowly and impact parameter for photon orbits um more quickly, but angular separation s increases more rapidly with parameters b and k. We compare our results with those for Kerr black holes, and also the formalism is applied to discuss the astrophysical consequences in the case of the supermassive black holes NGC 4649, NGC 1332, Sgr A* and M87*. In turn, we also investigate the shadows of the nonsingular Kerr-Sen black holes and show that they are smaller and more distorted than the corresponding Kerr black holes and nonsingular Kerr black holes shadows. The inferred circularity deviation Δ C≤ 0.10, for the M87* black hole shadow, put constraints on the nonsingular Kerr-Sen black hole parameters (a, k) and (a, b). The maximum shadow angular diameter for b=0.30M and k=0.30M are, respectively, θd=35.3461 μas and θd=35.3355 μas. We also estimate the parameters associated with nonsingular Kerr-Sen black holes using the shadow observables.
A semi-analytic model for the study of 1/1 resonant dynamics of the planar elliptic restricted co-orbital problem
Authors: Li Miao , Huang Yu-Kun , Gong Sheng-Ping
Published: March 2021

Mean motion resonances (MMRs) are widespread in our Solar System. Moreover, resonant dynamics has always been an essential topic in planetary research. Recently, the research about exoplanets and the potential Planet Nine with large eccentricity has given rise to our interests in the secular dynamics inside MMRs in the elliptic model. In this paper, we study the fixed points of the averaged Hamiltonian and the long-term stable regions of the 1/1 resonance (or co-orbital motion) in the elliptic restricted three-body problem (ERTBP) systematically. Numerical integrations prove those test particles trapped in “apsidal co-rotation”, where both the resonant angle ϕ
res and the secular angle ⧍ϖ (or apsidal longitude differences) librate simultaneously, always survive the long-term simulations. Furthermore, utilizing a semianalytical method based on the adiabatic approach, three families of long-term fixed points of the averaged Hamiltonian of the planar ERTBP inside the 1/1 resonance have been found. We call them QS-points, Hpoints, and T-points here, whose values of the (ϕ
res, ⧍ϖ) are (0°, 180°), (180°, 0°), and (± 60°, ± 60°), respectively. All the fixed points of the averaged Hamiltonian of the co-orbital motion in the ERTBP are presented in the e-e′ plane (′ represents the elements of the planet in this paper). We find that QS-points and T-points always exist for the arbitrary eccentricity of a planet, while H-points only exist for the cases of low e′ and very high e. Furthermore, we measure the libration width in terms of eccentricity, ⧍e, around these stable equilibrium points in the e-⧍ϖ phase-space portraits. The “apsidal co-rotation” around all the stable equilibrium points is presented in the e-e′ plane. All these results are effectively confirmed by numerical experiments. The long-term stable zones around these periodic orbits in the e-e′ plane are significant for the research of the co-orbital motion in the ERTBP. Above all, these practical approaches that we proposed can also be used to study the secular dynamics of other MMRs.
Collapsing index: a new method to identify star-forming cores based on ALMA images
Authors: Yue Nan-Nan , Gao Yang , Li Di , Pan Liu-Bin
Published: March 2021

Stars form through the gravitational collapse of molecular cloud cores. Before collapsing, the cores are supported by thermal pressure and turbulent motions. A question of critical importance for the understanding of star formation is how to observationally discern whether a core has already initiated gravitational collapse or is still in hydrostatic balance. The canonical method to identify gravitational collapse is based on the observed radial density profile, which would change from Bonnor-Ebert type toward power laws as the core collapses. In practice, due to the projection effect, the resolution limit and other caveats, it has been difficult to directly reveal the dynamical status of cores, particularly in massive star forming regions. We here propose a novel, straightforward diagnostic, namely, the collapsing index (CI), which can be modeled and calculated based on the radial profile of the line width of dense gas. A meaningful measurement of CI requires spatially and spectrally resolved images of optically thin and chemically stable dense gas tracers. ALMA observations are making such data sets increasingly available for massive star forming regions. Applying our method to one of the deepest dense-gas spectral images ever taken toward such a region, namely, the Orion molecular cloud, we detect the dynamical status of selected cores. We observationally distinguished a collapsing core in a massive star forming region from a hydrostatical one. Our approach would help significantly improve our understanding of the interaction between gravity and turbulence within molecular cloud cores in the process of star formation.
Research on the panel adjustment method of an active main reflector for a large radio telescope
Authors: Sun Zheng-Xiong , Wang Jin-Qing , Yu Lin-Feng , Gou Wei , Wang Guang-Li
Published: March 2021

The surface accuracy of a large parabolic antenna is an important indicator to evaluate the quality of the antenna. It not only directly affects the antenna’s aperture efficiency, thereby determining the shortest wavelength that the antenna can work, but also affects the main lobe width and side lobe structure of the antenna pattern. Microwave holography is an important method for parabolic antenna profile detection. In this article we adopt a new algorithm to adjust the panels for the large radio telescope with an active main reflector through the TM65 m antenna’s aperture phase profile. The panels of the TM65 m radio telescope is in a radial pattern with 14 rings. Each corner of the panel is fixed on the screw of the actuator to move up and down, and the adjacent corners of the four panels share an actuator. We use the method of plane fitting to calculate the adjustment value of every panel’s corner. But one actuator, which simultaneously controls the common corner of the adjacent panels, will have different adjustment values according to the different plane fitting equation based on adjacent panels. In this paper, the adjustment value of the adjacent panels’crosspoints are constrained to be equal to the constraint condition to calculate each actuator’s adjustment value of the TM65 m radio telescope. Through multiple adjustments and application of the new algorithms, the accuracy of the TM65 m antenna reflector profile has been improved from the original 0.28 mm to the current 0.19 mm.
New observations and transit solutions of the inflated exoplanets HAT-P-40b and HAT-P-51b
Authors: Kjurkchieva Diana P. , Petrov Nikola I. , Popov Velimir A.
Published: March 2021

We present high-precision photometric observations of the transiting exoplanets HAT-P-40b and HAT-P-51b by the Rozhen 2-m telescope. The newly-observed transit of HAT-P-40b is the first one with a complete curve. The orbital periods of the two targets were improved. We modeled the observed transits and found bigger stellar radii than those derived from the stellar models. The planet radii of HAT-P-40b and HAT-P-51b obtained from our transit solutions are bigger than the values calculated by the empirical relations for Jupiter-mass and Saturn-mass planets respectively. Their values reveal the highly-inflated nature of the two targets, especially that of HAT-P-51b. We established that the best transit solutions correspond to a quadratic limb-darkening law. The fitted limb-darkening coefficients of HAT-P-40 are close to the theoretical ones while those of HAT-P-51 are a little different. The precise astrometric Gaia distances of the two targets are smaller by 6%-7% than the calculated values from the stellar models. We propose the Gaia distances to be used for improvement of the stellar models as well as for more reliable calculation of the parameters of the known exoplanets.
Discovery of Four New Clusters in the Cygnus Cloud
Authors: Qin Song-Mei , Li Jing , Chen Li , Zhong Jing
Published: March 2021

We report the discovery of four new open clusters (named QC 1, QC 2, QC 3 and QC 4) in the direction of Cygnus Cloud and select their members based on five astrometric parameters (l, b, ϖ,

μ
α
*

, μδ
) of Gaia DR2. We also derive their astrophysical parameters for each new cluster. Structure parameters are generated by fitting the radial density distribution with a King’s profile. Using solar metallicity, we performed isochrone-fitting on their purified color-magnitude diagrams (CMDs) to derive the age of the clusters. The known cluster NGC 7062 in an adjacent area is chosen to verify our identification process. The estimated distance, reddening and age of NGC 7062 are in good agreement with the literature.
Van der Waals heterojunction ReSe2/WSe2 polarization-resolved photodetector
Authors: Tian Xiaoyu , Liu Yushen
Published: March 2021

Polarization-resolved photodetectors, a significant branch of photodetection, can more effectively distinguish the target from the background by exploiting polarization-sensitive characteristics. However, due to the absence of intrinsic polarized absorption properties of many materials, there is still a great challenge to develop the high-performance polarization-resolved photodetectors. Here, we report a van der Waals heterojunction (vdWH) ReSe2/WSe2 photodetector, which performs a high responsivity of ~0.28 A/W and a high detectivity of 1.1 × 1012 Jones under the illumination of 520 nm laser at room temperature. Remarkably, scanning photocurrent mapping (SPCM) measurements demonstrate the photoresponse of devices closely depend on the polarized angle of the incident light, indicating the effective polarized light detection. This work paves the way to develop high-performance polarization-resolved photodetectors based on two-dimensional (2D) materials.
Resonant enhancement of magnetic damping driven by coherent acoustic phonons in thin Co2FeAl film epitaxied on GaAs
Authors: Song Lin , Yan Wei , Wang Hailong , Zhao Jianhua , Zhang Xinhui
Published: March 2021

The magnetic dynamics of a thin Co2FeAl film epitaxially grown on GaAs substrate was investigated using the time- resolved magneto-optical Kerr measurement under an out-of-plane external field. The intrinsic magnetic damping constant, which should do not vary with the external magnetic field, exhibits an abnormal huge increase when the precession frequency is tuned to be resonant with that of the coherent longitudinal acoustic phonon in the Co2FeAl/GaAs heterostructure. The experimental finding is suggested to result from the strong coherent energy transfer from spins to acoustic phonons via magnetoelastic effect under a resonant coupling condition, which leads to a huge energy dissipation of spins and a greatly enhanced magnetic damping in Co2FeAl. Our experimental findings provide an experimental evidence of spin pumping-like effect driven by propagating acoustic phonons via magnetoelastic effect, suggesting an alternative approach to the possible long-range spin manipulation via coherent acoustic waves.
Synthesis and Study of the fluorescent properties of 4-hydroxy-coumarin derivatives
Authors: Al-Majedy Yasameen K. , Ibraheem Hiba H. , Shamel Shemaa , Al-Amiery Ahmed A.
Published: March 2021

On the other hand the synthesis and fluorescent characteristics of some 4-hydroxy-coumarin are given. When tetrabutylbromide is present in water, 4-hydroxy-coumarin condensation with 4-nitrobenzaldehyde results in a fairly good yield of 3, 3’-(4-nitrophenyl) methylene) bis(4-hydroxy-2H-chromen-2-one)1. Additionally compound 1 on methyl bromoacetate therapy supplied compound 2 then this compound condensation with hydrazinhydrate supplies compound 3. IR, 1H-NMR, 13C-NMR verified the structures of all synthesized compounds. Experimental fluorescent results revealed significant photoluminescent characteristics. The luminescent character ristics of all synthesized compounds are determined to exhibit strong blue-green fluorescent characteristics to widely used in various applications because of their beneficial properties.
Comparison of attenuation coefficient at different lasers 632, 785nm, 1310nm and 1550nm in Dust for optical wireless
Authors: Abud Mariam M. , Akhlati Janan A. , Roof. Asmaa M.
Published: March 2021

FSO is the main communication in the world. The air is composed of dust, sand, elemental loading and mineral particulates. The minerals particulates the particulates are majorly of two categories: A. Coarse Particulates (2.5-10 micrometer)

B. Fine Particulates (less than 2.5 micrometer) coarse aerosol particulate is determined by crustal sources like dust.

Methodology used FSO include a laser represent of transmitter through atmosphere to spectrum analyzer (receiver). Transmitter uses many laser sources (632.8, 780, 1310, 1550 nm). Results as shown the transmittance at different lasers and calculated the visibility caused by decreases of total attenuation coefficient with increasing to the light beam propagation. In this paper the visibility measurements for using different laser according laser transmissometer at short distance in the light and heavy dust around this distance between transmitter and receiver, indicate that results are appropriate when choosing a laser window of 632.8 and 1550 nm.
A review of Pure and Doped ZnO Nanostructure Production and its Optical Properties Using Pulsed Laser Deposition Technique
Authors: Haider Adawiya J , Jabbar Allaa A , Ali Ghalib A
Published: March 2021

In this review, the theoretical and experimental aspects of ZnO nanostructures production using pulsed laser deposition techniques were presented. It reviewed the work principles of pulse laser deposition technique (PLD) method, physical procedures such as ablation, and plasma plume creation accompanying the deposition of pure and doped ZnO from target to substrate material. Many ways of deposition and elements that affecting on the properties of thin films like the temperature of substrate, laser fluence (laser energy density), pulse repetition rate, pressure of oxygen in chamber, time of deposition process and post growth annealing which modify the deposition active factors like nucleation, and crystallization.
Preparation and Characterizations of Nanomaterial by Pulsed Laser Ablation in Liquid (PLAIL) as Friendly Environment Paint
Authors: Salih A A , Haider A J , Nazar A
Published: March 2021

In this research, silver oxide and nickel oxide were prepared as collide using Pulsed Laser Ablation in Liquid (PLAIL) method in the water. In all preparation case, the laser parameters were fixed at optimum conditions (laser energy 600 mJ with frequency 1 Hz at room temperature) and nanomaterial was added in several proportions (2%, 4%, 6%, 8%, 10%, 12%) to the local paint. Physical properties of the nano-collide were studied by Uv-visible spectroscopy, Scanning Electron Microscopy (SEM), Atomic Force Microscope (AFM), contact angle (CA). A colloid as core-shell (composite materials) was obtained when the two slices were placed together in the water and ablated them by laser. It has shown the best results compared to using its individual Ni or Ag. The local paint was tested in two cases: the first by adding nickel and silver as micro-scale, and in the other in nanoscale to compare which one the best in the self-cleaning. The nanomaterial at a percentage 12% showed the best results when it added to the paint; it for their properties such as adhesion strength and hardness strength, exposure to weather conditions of temperature, and humidity. The adhesive strength increased when adding the nanomaterial from 112 to 139 before exposure to the weather and from 58 to 108 after exposure. The hardness also increased from 77.9 to 86.5 before exposure to the surrounding environment and from 94.2 to 96.8 after exposure.
Human Eye Response to the Iris Diameter Variation at polychromatic light Programmatically
Authors: Shaker Lina M. , Al-Adili Aqeel , Al-Amiery Ahmed A.
Published: March 2021

Performance of the human eye is affected by generated aberrations along the optical path of the eye. So that, different the human eye models were designed and studied to understand the philosophy of this issue to treat it. The aim of this work is to study the impact of the iris diameter on the response of the human eye programmatically when white light is applied. The models of perfect and abberated eyes were designed by ZEMAX, PC software (version 15), and the iris diameter was changed from 2-10 mm gradually by 2 under the influence of white light. The modulation transfer function (MTF), wavefront aberration and root mean square of the spot sizes (RMS) were used to analysis the eye response to diameter variation and applied light. The results showed that the ideal image quality obtained at 2 mm iris diameter and started to get worse as the diameter was getting large. The lowest values of aberrations can be achieved by smaller iris diameters. Different types of aberration are generated whenever the iris diameter becomes larger, especially when the white light is applied due to generation of chromatic aberration, which in turn causes the dispersion of light to focus on a small spot on the retina.
Synthesis and characterization of magnetite Fe3O4nanoparticles using one step laser ablation in water under effect of external magnetic field
Authors: Bahjat Hasan H. , Ismail Raid A. , Sulaiman Ghassan M.
Published: March 2021

Iron oxide nanoparticles were prepared by Nd:YAG laser ablation in water under effect of an external magnetic field. The X-ray diffraction analysis of iron oxides nanoparticles showed that the synthesized nanoparticles were crystalline magnetite Fe3O4.The intensity of the x-ray peaks increased after applying the magnetic field. Field emission scanning electron microscope (FE-SEM) showed that the average grain size of the nanoparticles was decreased from 85nm to 45nm and the particles agglomeration has been decreased after applying the magnetic field. The energy gap increased after applying the magnetic field during the ablation process. Raman spectroscopy of the iron oxide nanoparticles showed formation of T1gand A1gmodes.
Synthesis and quantum chemical studies of methyl 2-(4-methyl-2-oxo-2h-chromen-7-yloxy) acetate derivatives
Authors: Shaker S. , Al-Majedy Y. K. , Ibraheem H. H. , Al-Amiery A.A.
Published: March 2021

derivatives of coumarin were synthesised in worthy yields. Their purity and chemical structures have been described using TLC, IR and 1H-NMR, 13C-NMR spectra. The Density Functional Theory DFT measurements of the coumarins synthesised were made using standardized molecular structure geometry. Molecular orbital calculations defined the orbitals in detail, including spatial properties, patterns, and contributions of the nodal to the individual atoms.
Effect of molar concentration on the structural, optical and electrical properties of the MnS thin film prepared by spray pyrolysis
Authors: Kadhm Ameera J. , Atwan Ahmed F. , Ismail Raid A.
Published: March 2021

In the study, manganese sulfide (MnS) thin films were deposited glass and silicon substrates at 350°C at different molar concentrations (0.05, 0.1, 0.15 and 0.2M) by using chemical spray pyrolysis technique. X-ray diffraction (XRD) studies revealed the existence of two phases of MnS namely; β-MnS and ɣ-MnS. Scanning electron microscope (SEM) showed that the films have no cracks, compact, uniform, and the grains are homogeneously distributed over the film. The optical properties studies that the optical band gap value of MnS films changed from 2.76 eV to 2.64 eV as molar concentration increased from 0.05 to 0.2M. Raman study revealed that the crystallinity of the film improved after increasing the molar concentration and the Raman peaks are belonged to2M magnon scattering. The AFM investigation exhibited that all the films show homogenous surface with and the surface roughness was a function of molar concentration. Hall effect measurement confirmed that the deposited MnS films were n-type.
Graphene-based Saturable Absorber for Pulsed Fiber Laser Generation
Authors: Shakaty Aseel A. , Hmood Jassim K. , Mhdi Bushra.R.
Published: March 2021

Recently, graphene has been considered as great candidate to be applied as the saturable absorber (SA) with its brilliant optical characteristics such as ultrafast recovery time and ultra-wideband absorption due to its zero bandgap energy and linear dispersion of Dirac electrons. This paper focuses on reviewing the generation of short pulses from passive mode-locked fiber lasers that employ graphene-based saturable absorber (GBSA). Various parameters that make it excellent for generation ultra-short pulsed including modulation depth, nonlinearity, saturation intensity, self-amplitude modulation, its crystal lattice structure, band gap energy distribution are discuss in details. Furthermore, comparison between single layers and multilayer GBSA is made to explain the effect of layers number on the behaviour of SA in ring cavity fiber lasers.
Structural and Optical Properties of nanostructured hybrid LiNbO3/Silicon wafer for Fabricating Optical Modulator
Authors: Mohammed Luma Z , Fakhri Makram A. , Abass A. K.
Published: March 2021

In this paper, a tattoo removal Q switching Nd: YAG laser, with a 6 nanosecond pulse duration, 2000 mJ power, frequency of pulses of 5 Hz was used to deposit of layer by layer of Silicone oxide, pure silicone, and lithium niobate for fabricated an optical modulator. The deposited layer by layer samples were analysed and characterized using the (XRD) X-ray diffraction, optical properties (UV-Vis spectroscopy) and photoluminescence (PL), and Atomic force microscopy AFM. Then we investigated of the deposited layers using. The XRD results showed the existence of different tops for all classes that have been deposited, Also, the optical and luminous results showed that only two peaks appeared, namely the top of the lithium niobate layer at the violet wavelength region with the limits of 368 to 381 nm, as well as the top of the silicon oxide layer within the middle of the visible wavelengths range and within the limits of 551 nm.
Solid State Reaction Synthesis and Characterization of Cu doped TiO2 Nanomaterials
Authors: Abbas M. M. , Rasheed M.
Published: March 2021

In this work, copper-doped titanium dioxide (TiO2) nano-powder with of different doping concentration, weights were successfully fabricated with a classical method. This method authorizes obtaining pellets from powder in nonmetric scale with a small quantity. The best conditions for fabrication these pellets are acquired. Different quantities of Cu concentrations (0%, 3%, 5%, and 7%) are mixed with TiO2 (NPs) nano-particles. Then, the mixed powders are transformed into pellets using hydraulic press and sintered by a traditional furnace at temperature of about 1100 °C. The following apparatus demonstrates the structural, morphological, mechanical, optical properties and the composition of elements of materials for those as-prepared samples: X-ray diffraction (XRD), optical microscope, scanning electronic microscope (SEM), Shore D hardness instrument, roughness test Instrument, Lee’s Disc, Fourier-transform infrared spectroscopy (FTIR) and Energy-dispersive X-ray spectroscopy (EDS) respectively. The effects of Cu doped concentrations on the properties of TiO2 NPs based on the above instruments are examined. Crystalinality of these materials revealed by XRD patterns and have a grain size between (20-30) nm. A roughness measurement points that TiO2 NPs values decreases with the addition of Cu weights because of hardness values of the samples. Moreover, results showed that the thermal conductivity increased with the increasing the weight fraction of Cu element. The main goal of the present research is to demonstrate the annealing temperature dependent behavior of the broadening parameter and the properties of Cu doped TiO2 NPs.
Influence of annealing temperatures on Nb2O5 nanostructures prepared using Pulsed Laser Deposition method
Authors: Fakhri Makram A. , Khalid Farah G. , Salim Evan T.
Published: March 2021

Nb2O5 nanostructures were successfully deposited by a Pulsed Laser Deposition technique (PLD) onto quartz substrates. The effects of annealing temperature on the optical morphological and structural properties deposited nano-thin films were investigated. The X-ray diffraction (XRD) results indicated the formation of the monoclinic crystalline structure, with a preferential orientation at the (301) direction. The optical energy band gap found to increase from 2.9 to 3.3 eV.
Effect of crosslinking agent (glutaraldehyde) on the mechanical properties of (PVA/Starch) blend and (PVA/PEG) binary blend films
Authors: Musa B. H. , Hameed N.J.
Published: March 2021

This paper displays the effect of glutaraldehyde (GA) as a crosslinking agent with different weight ratios (5,8 and 10%) on the mechanical properties (elongation at break and tensile strength) of polyvinyl alcohol/starch & polyvinyl alcohol / polyethylene glycol blend. Solution casting technique was used to prepare (75%PVA/25%corn starch), and (75% PVA/25% PEG) blend films. The results confirmed that when the increased concentration of GA, the tensile strength increased, while elongation at break decreased for both two blends. This study offers the groundwork for applications of this hydrogel membrane in a drug release system.
Performance Analysis of All-optical PPM-mQAM Communication Systems
Authors: Abdulzahrah Abbas Sattar , Hmood Jassim K.
Published: March 2021

Increasing the spectral efficiency of transmission has increased interests in hybrid optical communication systems. However, these systems suffer from the nonlinear fiber impairments that produce nonlinear phase noise (NPN). In this paper, we investigate all-optical coding m-ary quadrature amplitude modulation (mQAM) by pulse position modulation (PPM) in a single channel optical communication system to increase the transmission capacity and reduce the NPN. The system performance that optically modulates the data by hybrid PPM-mQAM format is numerically investigated by simulation. The results show that the transmission capacity is duplicated and NPN is significantly moderated when PPM-4QAM and PPM-16QAM are used. At bit error rate (BER) of 10−4, the transmission distances of PPM-4QAM is increased by about 33%, in comparison to 4QAM system. In addition, the required optical signal-to-noise ratios (OSNRs) for achieving BER of 1×10−4 are decreased by 4.7 dB and 7.5 dB for the PPM-4QAM and PPM-16QAM schemes, respectively.
The use of internet of things (lot) to produce trainer and remote lab learning media
Authors: Idhar  , Purnamawati  , Tangking R , Ruslan
Published: March 2021

This research aimed at designing and producing a learning media of Trainer and Remote Lab based on the Internet of Things (IoT), which can be used in learning in the era of the industrial revolution 4.0. This study employed Research and Development (R&D) method with four phases, such as Requirement, Design, and Coding & Testing. The Requirement stage is implemented by doing communication and interviews with lecturers and students. This activity intended to understand the conditions of the learning media used in the laboratory. The Design stage was carried out by preparing requirement specifications by creating an IoT Trainer and Remote Lab IoT system design architecture. While the Coding & Testing stage was applied by coding Fire base, Remote Lab, and Arduino (NodeMCU). Testing was applied to students and lecturers to check the connectivity and system failures. The results of this study were in the form of IoT (Hardware) trainer learning media using NodeMCU and Remote Lab IoT as a software of Android application. After testing the product 21 times, the result showed that an outstanding level of reliability was obtained, reaching 93.33%. Thus the IoT and Remote Lab Trainers are suitable for use as distance learning media.
A model for posttransliteration suggestion for balinese palm leaf manuscript with text generation and lstm model
Authors: Kesiman M W A , Maysanjaya I M D
Published: March 2021

The main challenge found in building an automatic transliteration system for Balinese palm leaf manuscript (Lontar) collections is that the recognition error in a small portion of glyphs of Balinese script can affect the results of transliteration widely. This is due to the fundamental nature of Balinese script which is a complex alphasyllabic script. This paper presents an initial proposition for a general scheme and model for suggesting several possible transliteration with text generation and LSTM for Lontar collection. The
Edit-Insert-Replace
model was proposed to be applied on the existing word collection dataset and a Bidirectional LSTM model with a specific feature extraction method was built for the training process of post transliteration suggestion module. This module will help in suggesting several possible transliterations based on the initial transliteration from the previous system.
Detection of dos attacks using naive bayes method based on internet of things (iot)
Authors: Setiadi F F , Kesiman M W A , Aryanto K Y E
Published: March 2021

Internet of Things (IoT) is a technology that is currently on a trend. Interconnecting networks on IoT are useful in the automation process, but it has vulnerabilities to network-based disruptions and attacks; such as Denial of Service (DoS). This study aimed at implementing the Naive Bayes algorithm to predict attribute classes using training data-sets from NSLKDD with the KDD99 format and obtained testing-data from the logging process of DoS attacks on IoT-based devices. The advantage of using Naive Bayes is that this method only requires a small amount of training data to determine the estimated parameters needed in the classification process. The results of the conducted research could detect attacks on IoT devices by using the help of snort tools to capture traffic logs. The results from the log were then converted into KDD99 format and processed by the Naive Bayes method. This research uses a training dataset from NSLKDD with KDD99 format which is widely used in various studies and testing data obtained from the IDS log process on the Raspberry Pi 3. The attributes used are 9 attributes namely; service, flag, src_bytes, dst_bytes, srv_serror_rate, same_srv_rate, diff_srv_rate, dst_host_srv_diff_host_rate and dst_host_srv_serror_rate. The results of the research analysis showed an accuracy of 64.02%. These results were smaller than previous results, but some aspects were still different from the actual results because the testing data and training data were taken from two different data-sets, thereby they had different characteristics.
Modified genetic algorithm for employee work shifts scheduling optimization
Authors: Saraswati N W S , Artakusuma I D M D , Indradewi I G A A D
Published: March 2021

Arranging an employee shift work’s schedule requires high accuracy. It is because we have to pay attention to several constraints simultaneously. The genetic algorithm presents as a method which can automatize the process of arranging the schedule as well as optimizing the result of the schedule. The Shala Bali is a hospitality business whose scheduling was complicated because of the number of the employes. This research aimed at producing a shift work schedule of the employees in a week and to know the optimum genetic algorithm parameter in this case. The constraints that were taken into account in the arrangement of the schedule included the schedule conflict of the employees in one shift, schedule conflict of employees in 1 day, the same composition of employees per shift, employees should not get morning shifts after being in night shift the night before, each shift has at least 1 employee in the front office, and each employee is required to get 1 day off within 1 schedule period. This study was able to produce an optimal work schedule of employees with crossover probability (Pc) of 0.6, and mutation probability (Pm) of 0.3. The modification algorithm in chromosome generation and chromosome structure in this study results that changes in gene length (additional number of employees) do not have to be followed by an increase in the number of chromosome populations to get optimum results.
Revitalization of dadong dauh balinese children’s illustrated song into 2-dimensional animation as an educational tourism strategy
Authors: Yusa I M M , Anggara I G A S , Setiawan I K , Westerlaken R , Herawan T
Published: March 2021

This study produced animated video clips revived from Balinese children’s song as an alternative media, by promoting brand equity in the form of characters and popular tourist attractions as an effort to promote cultural tourism in Bali, Indonesia. The strategy in reviving children’s songs was done through revitalizing the visualization of Balinese children’s illustrated songs. The visualization was done by turning the previous appearance of live action appearance into an animated form that proved to be preferred by children. The design of the Dadong Dauh character was constructed by manga matrix system model approach introduced by Tsukamoto. The data collection about song variation of Dadong Dauh and theory to develop imagery character and to design the character by using the manga matrix system was used by conducting a literature study. Reference collection of the visual of Dadong Dauh was used by conducting a literature study and observation. The result showed that the visualized video clip of local Balinese children songs in a two-dimensional form was able to revitalize the character branding of Dadong Dauh as a cultural symbol, with Tenganan village as its cultured environment. It also gained a great appreciation from children and has potential to popularize Dadong Dauh song.
Forecasting foreign exchange rate using a combination of linear regression and flower pollination algorithm
Authors: Pascima I B N , Putrama I M
Published: March 2021

Several currencies exist in the world. Each currency will have value. The currency exchange will go through a conversion process to adjust the amount. Each currency value can fluctuate based on the conditions of the currency area. The fluctuating changes in value provide profit opportunities. Maximizing profits can make forecasts so that the right decisions are made. One of the forecasts can use regression. Regression is capable of forecasting based on historical data. The regression in this study will be optimized using the Flower Pollination Algorithm (FPA). The use of the Flower Pollination Algorithm (FPA) aims to obtain appropriate parameters for regression to reduce forecast errors. The data in this study were obtained by utilizing extraction from the Meta trader application. This data will be the basis for the system learning stage and the testing phase. Obtaining a good hyperparameter can make the forecasting system closer to the actual value. Good system accuracy can be a trader’s supporting data in making transactions. Forecasting in this study used the parameter 5 window sizes, 20 population sizes, and 0.7 probability switch. This experiment resulted in MSE 0.0331 and RMSE 0.1756. This forecasting has sufficient results to support a trader’s decision. Further research is needed to improve accuracy and determine the direction of the forecast to improve this research.
The effectiveness of Automatic Network Administration (ANA) in network automation simulation at Universitas Pendidikan Ganesha
Authors: Santyadiputra G S , Listartha I M E , Saskara G A J
Published: March 2021

Network administration activities pose scalability challenges. Challenges arise when the devices handled are very numerous. Instead of using traditional methods, IT organizations need to implement automation methods. It is very inefficient to administer a large number of network devices by logging into them one by one. Human error is very susceptible to occur, which will cause configuration inconsistencies, to configuration errors, which will have an impact on poor network services provided. The automation method on the network is known as Network Automation (NA). NA uses an algorithmic approach in arranging steps in problem solving. NA is executed in the form of an application program that has the main function of automating routine, complex, repetitive, and comprehensive activities. Network administration activities that can be automated include routing automation, virtual administration and backup or restore. The simulation of NA implemented by ANA. ANA is the test is which was carried out using the Python programming language by utilizing Paramiko and Netmiko Library in a virtual environment using GNS3 and Virtual Box. The purpose of developing ANA was to make network administration activities run more efficiently. The results of applying the ANA can be taken into consideration in network administration activities. The result showed ANA was effective to prove the NA purpose.
The simulation of divayana formula calculation to determine the priority of recommendation in evaluation activities
Authors: Divayana D G H
Published: March 2021

Evaluation activities are not carried out to determine whether to pass or not the program being evaluated. Evaluation activities tend to provide recommendations for improving or completion of the constraints that are still found in the program being evaluated. The problem that often occurs in the field is the difficulty in determining recommendation priority for each evaluation aspect. Therefore, a precise and accurate formula is needed to determine the recommendation priority in an evaluation activity. Hence, the evaluation results will be more optimal. The purpose of this study was to demonstrate a DIVAYANA formula calculation simulation in determining recommendation priority. This research approach was evaluative with research stages that follow the DIVAYANA model stages. This research focused on the DIVAYANA formula part which lies at the Nominate stage. The subjects involved in the initial data collection were ten students from the Department of Informatics Education, Universitas Pendidikan Ganesha. The subjects involved in determining the weight for the evaluation component were four experts. The tool used for initial data collection and expert weight determination was questionnaires. The analysis technique of this research was done by checking the correctness of the DIVAYANA formula calculation based on case proof. The results showed that the process of DIVAYANA formula calculating simulation had been running well as evidenced by the accuracy of the results of determining priority recommendation.
Smart school strategic design for information systems using framework ward & peppard in smk negeri 1 tampaksiring
Authors: Aryotejo I G N B , Candiasa I , Divayana D G H
Published: March 2021

Vocational School (SMK) is a formal institution which is aimed at producing graduates who are ready for the 21st century workplace. In order to do this, SMK Negeri 1 Tampaksiringhas been improving the quality of the human resources through the implementation of technologyin the learning process. It is started by updating the information systems and other supporting facilities like integrating planning, or blueprint, in regard to school information systems. These become a necessity in order to be aligned with the vision, mission and objective of SMK Negeri 1 Tampaksiring. A model design by Ward and Peppard was applied to analyze school internal conditions and activities inside the school. Furthermore, several tools namely SWOT analysis, value chain analysis, five force factor analysis, McFarrland Grid, and Critical Success Factor (CSF) analysis were used to analyze the purpose. The findings revealed that formation of Information and Communication Technology (ICT) and IT strategy required to design Local Area Network (LAN), e-Learning, and AplikasiBuku Point in its preliminary stage for the success of SMK Negeri 1 Tampaksiring. These results implies that SMK Negeri 1 Tampaksiring has pioneered itself to become a smart school.
Designing learning object using articulate storyline 3 for supporting indonesia online learning system (spada)
Authors: Sindu I G P , Santyadiputra G S , Permana A A J
Published: March 2021

This study aimed at design learning object using Articulate Storyline 3 for supporting the Indonesian Online Learning System (SPADA). This is a development research using ADDIE model. ADDIE Model development design was combined with the AGILE Method to develop learning tools. The expected benefit from this research is being able to integrate learning objects with other learning objects at SPADA Indonesia. The development stages were determining the course to be developed, conducting needs analysis, developing draft, utilizing the Universitas Pendidikan Ganesha E-learning software, and testing (a review from content expert and field testing). The results of the learning object design can help and facilitate lecturers and students to carry out the lecturing process better and be able to increase the level of mastery of the subject matter. Students and lecturers would not be limited to face-to-face meeting and time. Based on the validity test conducted by media, design and content experts, it could be said that the AS3-based learning object designed was “Very Valid” and could be used for lecturing process.
Design of user satisfaction evaluation instrument of informatics engineering education graduates, faculty of engineering and vocational, universitas pendidikan ganesha
Authors: Subawa I G B , Mertayasa I N E , Agustini K , Wahyuni D S
Published: March 2021

This research was a design stage of an instrument used to evaluate the satisfaction of the users of the graduates of the Informatics Engineering Education Study Program. This research was aimed at producing an instrument in the form of a proper questionnaire. The questionnaire creation was based on seven indicators as a reference namely, ethics, expertise in accordance with the field, foreign language skills, the ability to use information technology (IT), communication skills, teamwork, self-development. The seven indicators were broken down into 20 statement items to a questionnaire draft. There were several tests carried out on the questionnaire draft, the Gregory test involving 2 experts in the field of evaluation, the validity of the items using Pearson Product Moment correlation, and the reliability test using the Cronbach alpha formula. The result of the Gregory test is the coefficient value of the content validity of the instrument being tested (0.85), which is categorized as high. Based on the item validity test, 17 questions were valid. The reliability test results in a Cronbach Alpha value of 0.973. Based on the results of the tests carried out, the questionnaire instrument fits for measuring user satisfaction of the Informatics Engineering Education study program graduates.
Social media as integrated character education media
Authors: Candiasa I M , Mertasari N M S , Aryanta M
Published: March 2021

Character education in schools is carried out in an integrated manner in all subjects. Integrated character education involves the school, family, and community in its implementation. The very few communication opportunities make the implementation of integrated character education involving families and communities difficult. Through this opportunity, we tried to introduce social media to be used as an integrated learning media for subjects and character education. The teacher can provide material and assessment to students and students can learn and submit assessment completion through the media. In addition, students can also place all of their work in a folder prepared for each student to accommodate their portfolios. Teacher-student communication and student-student communication can be done through groups or private chats. Such a mechanism can monitor student learning progress and at the same time train students’ courage to express opinions, collaborative skills, responsibility, respect for other people’s work, and independence. However, the effort to increase honesty and independence, social media has not provided satisfactory results because during the implementation of tests that must be done independently, students often exchange answers. These findings can be used as a reference for finding techniques around the use of social media in practicing honesty and independence.
The impact of external knowledge on organization performance with indirect effect of instructional agility and process innovation effectiveness
Authors: Wahyuni D S , Agustini K , Ariadi G , Mertayasa I N E , Sugihartini N
Published: March 2021

Engaging industry in Vocational High School (VHS) policy outcomes does not only offer awareness of market needs, but also enables industries to influence learning and teaching methods and courses across the overall VHS. This study indicates that external knowledge leads to the feasibility of instructional agility, and process innovation effectiveness, resulting in success of VHS. This study looks at structural equation modeling (SEM) analysis based on empirical data obtained from 129 vocational high schools in Bali Province, Indonesia. The study aimed to concentrate explicitly on how the impact of external knowledge on VHS achievements in Indonesia is mediated by instructional agility, and process innovation effectiveness. The study shows that external knowledge has no influence on VHS performance, while improving VHS performance indirectly through all instructional agility and effectiveness of process innovation.