bluuebunny/crossref_metadata_2025 huggingface dataset:
Influence of the geometry of defects in textronic structures on their electrical properties
Authors: Pawłowski S , Plewako J , Korzeniewska E
Published: March 2021

Continuity of the conductive path is a prerequisite for the phenomenon of electric current to exist in the structures of wearable electronics. The value of the current depends not only on the material properties of the structure but also on the geometrical dimensions of the defect of a thin electrically conductive layer. The article describes the analysis of the influence of the width and slope of the linear defect of a thin metallic layer on the value of the current. The conducted simulations show that when the width of the defect is smaller than 40% of the distance of the defect from the edge of the path, the current intensity depends on the ratio of the width to the length of the defect to a very small extent. The value of the current also depends on the slope of the defect to the path axis. In the case of a larger number of defects, their influence on the effective track resistance depends not only on their size but also on their location and distance from each other. The resistance of the entire electrically conductive layer is also influenced by the location of defects in relation to its edges.
Thermal and Mechanical Properties a Membrane of the Mixing PVA Nanocomposite and Limestone Hydroxyapatite
Authors: Sirait Makmur , Sinulingga Karya , Siregar Nurdin , Fitri Dewi , Padang Samuel T.W.
Published: March 2021

Synthesis and characterization of membranes from a mixture of PVA nanocomposites and limestone hydroxyapatite have been carried out. The limestone is crushed, sieved with a size of 200 mesh. The synthesis of hydroxyapatite was carried out by heating limestone powder using a furnace at a temperature of 600 °C for 4 hours. Furthermore, limestone was dissolved with distilled water and 0.3M H3PO4 solution using a magnetic stirrer with stirring at 300 rpm for 1 hour. The pH of the solution was made 10 by adding 1 M NH4OH periodically. The solution was aged for 24 hours and the precipitate was dried using an oven at 120 °C for 5 hours. The hydroxyapatite powder was characterized by FTIR to see the functional groups and XRD characterization to see the hexagonal hydroxyapatite phase. The characterization results obtained that the main groups of hydroxyapatite compounds were calcium hydroxide (CaO), phosphate (PO4
3-), and hydroxyl (OH−) groups with a crystal size of 86.27 nm. Limestone hydroxyapatite was mixed with a solution of PVA-chitosan with a composition variation of 0%, 1%, 2%, 3%, and 4% weight using a magnetic stirrer at 40°C for 3 hours using the sol-gel method. The membrane obtained was characterized by DSC to determine its thermal properties and UTM to determine its mechanical properties. The maximum melting point obtained in the mixture (98: 2) % was 195.51°C and the highest tensile strength was at the percentage of 1% with a modulus of elasticity of 22.28 M.Pa and tensile strength of 13.23 M.Pa.
Percentage of reducing heat of coco fiber material as a potential isolation of building walls
Authors: Kemala J , Selamat T , Rusnardi R , Rumilla H
Published: March 2021

This paper was purposed to determine the percentage of coco fibers ability in reducing heat as a potential for insulation building walls with different coco fiber thickness. For the fulfillment of thermal comfort in buildings requires engineering, knowledge and skills and innovation. One way to reduce hot air in the room can be done through walls, thereby reducing the use of air conditioning. The walls need protection and solar heat absorbers which can make the room inside the building have thermal comfort. Based on this, research needs to be done on natural ingredients that can function to reduce heat. Tests carried out on coconut fiber and fiber-free materials. Material without fiber and coco fiber thickness are 1 centimeter, 2 centimeter and 3 centimeter. This coco fiber material is coated with a mixture of cement which also functions as a fiber adhesive. In this case testing by applying heat of 35 Celsius degree to one side of the fiber and measuring the temperature that occurs on the other side of the fiber. The test results found that there was a significant difference between the heat temperature supplied and the heat temperature measured on coco fiber. The thicker the coco fiber material, the greater the percentage of heat that can be reduced. This shows that the coco fiber material has the potential to reduce heat as a wall covering against solar radiation.
The Development of Physics Test Instrument Based on PISA for Optical Topic in High School
Authors: Hijriati  , Sahyar  , Derlina
Published: March 2021

The purpose of this study is to develop a PISA-based physics test instrument for optical topic in high school with a valid category. This study is a type of research and development (Research & Development). The concept used is the development of Analysis, Design, Development, Implement and Evaluation (ADDIE). This research is limited to the development stage, namely expert validation. The stage of needs analysis and material analysis with literature study, it was found that there was minimal variation in the assessment and students still find it difficult to find references to PISA-based physics questions, especially on optical material. The material for developed physics problems includes optical phenomena, light reflection, light refraction and optical tools. At the design stage, 40 items were obtained based on the PISA scientific literacy competency, which were classified into three competency standards, namely: explaining scientific phenomena; evaluate and design scientific research; interpret scientific data and evidence. Furthermore, at the development stage, the validity test was carried out with three expert validators. The results of expert validation show that 35 items meet the content and construct validation with the valid category with revision and very valid, while 5 items are invalid and cannot be used.
Adsorption and desorption of zinc and copper in acid mine drainage onto synthesized zeolite from coal fly ash
Authors: Hidayat Amalia Ekaputri , Moersidik Setyo Sarwanto , Adityosulindro Sandyanto
Published: March 2021

Synthetic zeolite is considered a more effective adsorbent due to its high purity and high removal efficiency. On the other hand, acid mine drainage contains various metal ions, such as zinc, copper, iron, and manganese which are toxic for the ecosystem in a certain concentration. One of the solutions to remove these metal ions is through adsorption. Therefore, the study of adsorption and desorption of zinc and copper onto synthetic zeolite was conducted. The synthetic zeolite was synthesized from coal fly ash and the acid mine drainage was prepared artificially. The adsorption experiment was carried out using a batch system. NaCl, H2SO4, and HNO3 were used as desorption agent. The adsorption studies revealed that the removal efficiency of both Zn2+ and Cu2+ onto the studied adsorbent decrease with the increase of adsorbate concentration. While the adsorption selectivity for multi-system synthetic AMD solution by the studied adsorbent were found to the order of Fe2+> Cu2+> Zn2+> Mn2+.After being reused three times, the synthetic zeolite shows a decrease in for Zn2+ and Cu2+ adsorption efficiency of about 10%. Furthermore, the desorption study shows the ineffective use of NaCl, H2SO4, and HNO3 as desorption agents in this study.
Modeling of transient caused by lightning strike at Nias high voltage substation using ATP-EMTP case study
Authors: Hardi Surya , Matondang Aprima Anugerah , Rambe Ali Hanafiah
Published: March 2021

Lightning has always been a dangerous threat to power system equipment consisting of: power plants, substations, transmission lines and distribution lines. Commonly, the overhead high voltage transmission line is subjected to lightning strikes. Therefore the protection level against lightning is determined based on the level of insulation of equipment. To prevent damage due the equipment due to a lightning strike, an arrester is used. In this study, three models of arrester are used as comparison viz. IEEE arrester model, Micaela arrester model and Karbalaye arrester model. The system were simulated by using the Alternative Transients Program (ATP) software. The results show that the lightning arrester is declared successful in protecting the transmission system, where the three lightning arresters have Margin Protection (MP) arrester which reaches 28%. In the simulation, it is known that the IEEE and Karbalaye arrester successfully breakdown the lightning current in transmission system so that the transient overvoltage recorded on the transformer does not exceed the Basic Insulation Level (BIL) value of the transformer. While the Pincenti arrester has also succeeded in reducing the voltage on the system but its value is greater than the transformer BIL of the substation, Teluk Dalam, Nias
Modeling Of Generator Neutral Grounding Through Distribution Transformator Using Lab View Graphical User Interface
Authors: Hardi Surya , Fitriani Ayu , Sinulingga Emerson P.
Published: March 2021

Computation of the generator neutral grounding system through a distribution transformer can be done through manual calculations. A lot of data is used in calculations so that the possibility of recurring calculations. This is very difficult and causes a large difference in the calculation results. Therefore, a computer-based computing system is needed to overcome problems like this. Several papers have been developed on the calculation of the voltage capacity through medium grounding, the length of the electrodes attached to the ground of the generator, one-phase faults to the ground, and zero sequence current disturbances. Therefore, this paper discusses modeling using the LabView Graphical User Interface (GUI) application to create it easier to design neutral grounding for equipment. As an implementation, modeling using Std. C62.92.2TM-2017 data and the results of the generator neutral grounding design can be easy, faster, and more accurate.
Improved Quality of using Voltage Static Var Compensator and Capacitor Bank on the Transmission Line
Authors: Hardi Surya , Rahmat Muadzzah , Sinulingga Emerson P.
Published: March 2021

The increase in load which increases every year causes a decrease in voltage on the line which is getting bigger. The voltage drop on the transmission line greatly affects the quality of the voltage. The voltage that arrives at the electrical equipment will decrease which in turn reduces the performance of the equipment. The power flow study uses the Fast Decoupled method, the voltage on each bus can be determined. The performance parameters observed are the value of the power factor, voltage, active power, and reactive power to determine the parameters for the location and size of the capacitor bank capacities and the static var compensator (SVC). By increasing the power factor in the range of 0.85pu to 0.95pu, the bus voltage can fulfill the SPLN standard. Parameters are designed and simulated using the ETAP programming software version 12.6.0 by testing each bus that experiences a voltage drop in turn based on the voltage limit and the power factor value ≤ 0.85pu. Furthermore, several buses with the appropriate capacity rating are selected to increase the voltage on the system. The simulation results will show the effectiveness of the capacitor bank and static var compensator (SVC) to increase the voltage value on each bus.
Prediction of Land Change for Oil Palm Plantations in Penajam Subdistrict, Penajam Paser Utara Regency, East Kalimantan Province
Authors: Maulidya Afifah , Damayanti Astrid , Indra Tito Latif , Dimyati Muhammad
Published: March 2021

Penajam Subdistrict is the center of government and economy of the North Penajam Paser Regency. It has an area of oil palm plantations that continues to grow every year. The massive growth of oil palm plantations has resulted in converting agricultural land to oil palm plantations. The transformation of land function occurs because oil palm plantations are considered more profitable than planting rice. This study aims to analyze and predict land-use changes for oil palm in Penajam Subdistrict in 2031. The method used in this study uses a Geographical Information System (GIS) approach with the CA-Markov prediction model. The drivers of land-use change as input to the CA-Markov model consist of distance from the road, distance from the river, distance from the forest, elevation, and slope. The results showed an increase in the area of oil palm plantations and a decrease in the forest area. The Kappa test results show a value of 88%, which means it has an adequate accuracy level. In 2031, the location of oil palm plantations in the Penajam Regency will reach 11,542.57 ha or 23,1%.
Planting Pattern Modeling Based on Rainfall Prediction Using Backpropagation Artificial Neural Network (Case Study: BMKG Rainfall Data, Deli Serdang Regency)
Authors: Simamora Elmanani , Yusardi Wahyunita , Mansyur Abil
Published: March 2021

The results of data analysis are known from the Agricultural Research and Development Agency that the cropping pattern in Deli Serdang Regency was initially rice-rice with changes in varieties, the cropping pattern changed to the rice-rice-rice pattern. The continuous rice cropping pattern for some time eventually caused new problems, namely the exploitation of rice pests (leafhoppers, Nephotettix Virescens, Orsealia Oryzae) and causing crop failure. This exploitative rice pest is one of the causes of the decline in agricultural productivity in the Deli Serdang Regency. The purpose of this study provides alternative solutions to increase agricultural production in Deli Serdang with modeling cropping pattern most profitable based on the placement of planting time that best suits the needs of rainfall in Deli Serdang that predicted using Neural Network Backpropagation so it can be used as guidelines in the utilization of agricultural land in Deli Serdang Regency. The model Backpropagation best in this study is 12-2-1, with the learning rate best 0.08 and best momentum 0.99 with Mean Square Erro testing is 0.0260. Based on the planting calendar and cropping models obtained from rainfall predictions, the cropping patterns that can be applied in Deli Serdang Regency are modeled, namely the cropping patterns of palawija-rice-rice, palawija-rice-palawija, palawija-palawija-palawija, and palawija-palawija-rice.
Fuzziness Evaluation on Hybrid Context Based Clustering Methods with Fuzzy Geographically Weighted Clustering-Particle Swarm Optimization Algorithm
Authors: Abdussamad Siti Nurmardia , Astutik Suci , Efendi Achmad
Published: March 2021

This research contains to hybrid Context Based Clustering Method integrated with Fuzzy Geographically Weighted Clustering-Particle Swarm Optimization (CFGWC-PSO). The computation time using CFGWC-PSO Algorithm is faster than other algorithms. CFGWC-PSO algorithm was applied on 11 variables from data factors causing the spread of dengue in East Java. One of the parameters used in this analysis is fuzziness (m), which is the parameter used to measure the level of obscurity from the clustering results. In this paper will use different fuzziness (m) values to evaluating best fuzziness value (m) which are appropriate used to clustering with CFGWC-PSO algorithm. CFGWC-PSO algorithm using fuzziness (m) = 1.5 and fuzziness (m) = 2, number of clusters = 2 then CFGWC-PSO will evaluated using IFV index. Based on IFV index found that the best clustering in this case with CFGWC-PSO algorithm is with using fuzziness value (m) = 2.
Design and Realisation of Reusable Artefacts for Internal Supply Chain Management in Manufacturing Company
Authors: Komarudin Oman , Arrumaisha Hanifa , Azurat Ade
Published: March 2021

Maintaining many similar software products with huge similarities and some variations have been studied is Software Product Line Engineering (SPLE). Traditional software methodology lacks the notions to model and maintain those variability and commonality in all phases of standard known software methodology (e.g. from requirement phase up to the testing phase). This paper shows a proposed software methodology based on SPLE to ease the development and maintainability of similar software product. The paper focuses on the design and realizes the reusable artefacts to generate a family of software products systematically with case study example of Supply Chain Management in Manufacturing. This methodology utilized the commonly known UML diagram with the use of UML Profile of Delta Programming and some tools of code generator.
Effect of Inquiry Learning Model on Science Process Skills and Critical Thinking Ability in Human Movement Organs in Class V Public Elementary School 050666 Lubuk Dalam Stabat.
Authors: Sari Nurza Ulfa Maya , Suyanti Retno Dwi , Dewi Rosmala
Published: March 2021

This study aims to determine: (1) The effect of the inquiry learning model on science process skills on human movement organ material in class V SD Negeri 050666 LubukDalamStabat District; (2) Increasing science process skills by using the inquiry learning model in the eye organ movement material in humans in class V SD Negeri 050666 LubukDalam, Stabat District; (3) The effect of the inquiry learning model on the critical thinking ability of human movement organ material in class V SD Negeri 050666 LubukDalam, Stabat District; (4) Increasing the ability to think critically with the inquiry learning model in the eyes of the movement organ material in humans in class V SD Negeri 050666 LubukDalam, Stabat District. This study used a pretest and posttest non equivalent control group design. The instrument in this study was a test of science process skills and critical thinking skills. The data analysis used t-test and gain score. The results showed: (1) the inquiry learning model has an effect on science process skills, this is based on the value of sig. (2-tailed) 0.000<0.05 that H0 is rejected; (2) there is an increase in science process skills improvement by using the inquiry learning model, this is based on the gain score; (3) the inquiry learning model has an effect on critical thinking skills, this is based on the value of sig. (2-tailed) 0.000<0.05 so that H0 is rejected; (4) there is an increase in critical thinking skills with the inquiry learning model, this is based on the gain score.
The Obstacles of Software Process Improvement in Software House: A Systematic Literature Review and Empirical Study
Authors: Elfaiz Ersha Aisyah , Raharjo Teguh
Published: March 2021

A software house, that established in 2005 based in Indonesia, got 31 projects in 2019. By the end of year, Project Management Officer released documents to inform company’s project health. There are 14 projects confirmed late, 6 projects on time and 11 projects scheduled complete on the next year. That late projects cause serious problem like loses revenue and gets disrupted of company’s cash flow. Based on the root cause analysis, it found that no standardization of software development process in the company. Before designing the standardization to improve process, we need to analyze the obstacles that might be happened. Therefore, this study aims to identify the obstacles on software process improvement in software house. We performed a systematic literature review to determine the obstacles, then we do empirical research to 58 employees on company’s development department to sort the priority of obstacles in the company. From the systematic literature review, we found studies that relevant and there are 13 obstacles of software process improvement, then from the empirical research we got top three obstracles. We also proposed recommendations to solve that obstacles.
The Effect Of Source Voltage Fluctuation on Ilumination Decrease In Bandles, Led Lights, and Energy Saving Lights
Authors: Rimbawati  , Pelawi Zulpadli , Alam Hermansyah , Irwanto M.
Published: March 2021

The fluctuating source voltage causes the distributed voltage not to have a nominal value of 220V and affects the characteristics of the lighting. In this study, observations were made on the change in source voltage of the three types of lighting during peak load times. The purpose of this research is to show that any change in the source voltage (PLN) can affect the lifetime of the light bulb. From the results of research on one of the LED lights, when 0 hours is turned on, the source voltage is at 227.0 volts with 108.4 Lux lamp illumination. When 12 hours are turned on, the source voltage is 225.9 Volts with 103.3 Lux lamp illumination. There was a decrease in source voltage of 1.1 Volt and a decrease in illumination of 5.1 Lux. And when 24 hours the lamp is turned on, the source voltage is at 230 Volt with 97.8 Lux lamp illumination. There was an increase in source voltage of 4.1 Volt and a decrease in illumination of 5.5 Lux. As a result of frequent increases in source voltage, the lamp lifetime will decrease more rapidly.
Exploring the Predictors of Consumers’ Purchase Intention of Terrestrial Digital Decoder
Authors: Ariansyah Kasmad , Wardahnia
Published: March 2021

Indonesia is one of the countries that currently struggle to switch terrestrial television from analog to digital. The Indonesian government has distributed terrestrial digital decoders in several trial areas so that the recipients can experience the terrestrial digital broadcasts on their old analog television. The distribution of the decoder is expected to encourage recipients to convert to digital completely. Once the decoder cannot be used anymore, the recipients can choose either to purchase integrated digital television (DTV) or a new decoder to keep experiencing the terrestrial digital broadcasts. This study focuses on the consumers’ intention to buy a new decoder based on respondents’ demographics, television media consumption, pay television subscription, the availability of public, private, and cross-border television signals, and the perception against digital terrestrial-related factors. Primary data was collected through a survey in several free decoder distribution locations, while the samples consist of the decoders’ recipients. This study uses binary logistic regression as the analysis method. The results indicate that the intention to buy a decoder is influenced by geographical location, the subscription to both cable-based and satellite-based television, TV-viewing duration, the satisfaction with the quality of digital terrestrial television, and the satisfaction with the decoder they have received.
Technical and economical evaluation of high-quality slag remover production from Indonesian perlite rock
Authors: Wahyudi Agus , Darmawan Didit Adi , Mamby Hasudungan Eric , Suherman Ijang
Published: March 2021

Perlite is a volcanic mineral that potentially used as a functional material in various fields of application. One of the applications is as a slag remover material used in the metal casting industry. In present work, perlite rock from Padang Pariaman, West Sumatra, Indonesia has been used for production of slag remover, with a capacity of 20 ton/day or 6,000 ton/year. Technical aspects, such as characterization of raw materials, testing of process equipment, and characterization of the product, have been carried out. In conventional slag remover production, the drying process was carried out by sun-dried, so it takes a long time and sometimes the specified moisture content is not achieved due to weather factors. Meanwhile, in this work, a rotary dryer was used so that the drying process can be done faster. The resulting slag remover has a particle size of -10 mesh to +60 mesh and a moisture content of less than 0.5%, so that it meets the industrial specifications. Economic calculations were also carried out by calculating the investment costs, operating costs, bank interest, and inflation. With a production capacity of 6,000 ton/year and 15 years of project period, the financial feasibility analysis was as follows: NPV of IDR18,722,373,778; IRR of 34%; and PP of 4 years. Based on the analysis, the production of high-quality slag remover from Indonesian perlite was feasible.
Phytogenic silver nanoparticle (AgNP) from Ananas comosus (L) Merr. peel extract to inhibiting the pathogen resistance
Authors: Mahardika Dimas Pradhasumitra , Yusrita Eli , Surya Alfin , Juariah Siti
Published: March 2021

Green Nanotechnology utilizing various plant extracts (phytogenic) has widely known and proven as ecofriendly and inexpensive scientific approach with numerous potentials in medical treatments. Silver nanoparticles (AgNPs) has been commonly used in home cleaning products, wound dressing and antimicrobial coating for medical equipment. Furthermore, Ananas comosus (L.) Merr. (AC) is an exotic tropical fruit, found abundantly in Riau Province. It is rich on bromelain enzyme in addition to its potential as antibacterial, antioxidant as well as anticancer. Contrarily, utilization of waste from plants, fruits and food as alternative natural reduction and capping agents from metal ion nanoparticles is still being developed. Combining these two elements has an immense potential as an effective alternative therapeutic substance in the near future. The purpose of this research is to analyze AgNPs from AC by characterizing the product of biosynthesis. Furthermore, this research will also observe antimicrobial activity of AC-AgNPs against Methicillin Resistant Staphylococcus aureus (MRSA). As a result, the biosynthesis produced AC-AgNPs which showed the ability to inhibit the growth of MRSA with an average of 10.59 mm, 20% more effective compared to pure AC extract. AC-AgNPs formation were characterized using UV–visible spectroscopy in the interval of 439– 486 nm.
Effect of aerobic exercise and supplementation virgin coconut oil on lipid profile
Authors: Sinaga F A , Samosir A S , Sinaga R N , Ayu E , Manalu N. , Ginting A A , Zulaini  , Zulfachry
Published: March 2021

Dyslipidemia and sedentary lifestyle are risk factors for atherosclerotic heart disease. The research objective was to determine the effect of aerobic exercise and virgin coconut oil supplementation on the lipid profile of obese women. The research subjects were 20 women with obesity, divided into two groups, namely the experimental group (doing aerobic exercise and VCO supplementation) and the control group (only doing aerobic exercise) with the 43.55±2.21 age, 154.75±0.05 height, 75.75±1.44 weight and 31.69±1.63 BMI. The experimental group did aerobic exercise and VCO supplementation for 8 weeks, while the control group did aerobic exercise without VCO supplementation. Total cholesterol and triglyceride levels were measured before and after aerobic exercise. Using the t test, statistical analysis was conducted and the significance level of the test was considered to be p<0.05. The results showed that the combination of aerobic exercise with VCO supplementation resulted in a more significant reduction in triglyceride levels and cholesterol compared to aerobic exercise (p = 0.001). The conclusion is that the combination of aerobic exercise with VCO supplementation can reduce triglyceride levels and total cholesterol, thus preventing cardiovascular disease.
Study of Phytochemical, Antibacterial Activity and Toxicity on Acetone Extract Seed LeersiaHexandraSw
Authors: Juwitaningsih T , Sari S A , Jahro I S , Silaban S , Simorangkir M
Published: March 2021

The Sayat-sayat(LeersiahexandraSw) plant is a plant used in traditional medicine by the Batak Karo people in North Sumatra. This study aims to examine the phytochemical content, antibacterial activity and cytotoxic test of acetone extract of L.hexandraSw seeds. Phytochemical tests include tests for alkaloids, flavonoids, saponins, tannins and steroids. Antibacterial tests were carried out against Propionibacterium acnesATCC (27853), Escherichia coli ATCC 25922, Bacillus cereus ATCC 1178, Salmonella enterica ATCC 14028 with the paper disc diffusion method M02-A11 (CLSI) and continued with the determination of MIC and MBC using the microdilution method M07-A9 (CLSI). The toxicity test used the Brint Shrimp Lethality Toxicity (BSLT) method using Artemia Salina Leach shrimp larvae. The results of phytochemical screening showed that the acetone extract of the L.hexandraSw seeds contained alkaloids, flavonoids and terpenoids. The results of the antibacterial activity test showed the best activity against B. cereus ATCC 1178 and S. enterica ATCC 14028 with an inhibition zone in the range of 8.4-8.6mm, with MIC and MBC values of 625 μg/mL. The results of the toxicity test are toxic and potentially bioactive.
City travelling salesman problem with minimizing truck weight in fragile road
Authors: Aurachman R
Published: March 2021

The process of delivering goods can be modeled in the TSP model; Traveling Salesman Problem. Several existing TSP models try to minimize the mileage so as to minimize transportation costs from vehicles. In the context of city logistics, the quality of the roads used to deliver goods is also used by city residents’ vehicles. The route taken for the first time contains a heavy mass because the cargo being transported still contains all the goods that will be delivered later. Then the mass of the truck cargo will gradually decrease from the heavy mass to the very light mass at the final destination, because the entire load has been delivered. Through this paper, we propose a TSP model development that can choose the order of delivery by considering the road conditions taken, so that a route will be obtained that minimizes the risk of road damage due to the large mass of the load.
On rainbow antimagic coloring of special graphs
Authors: Septory B J , Utoyo M I , Dafik  , Sulistiyono B , Agustin I H
Published: March 2021

LetG(V, E)be a connected, undirected and simple graph with vertex set V(G) and edge set E(G). A labeling of a graph G is a bijection f from V(G) to the set {1, 2,…, | V(G)|}. The bijection f is called rainbow antimagic vertex labeling if for any two edge uv andu’v’in pathx — y,w(uv)=w(u’v’)w(uv),wherew(uv)= f (u) + f (v) andx,y ∈V(G). A graph G is a rainbow antimagic connection ifGhas a rainbow antimagic labeling. Thus any rainbow antimagic labeling induces a rainbow coloring ofGwhere the edgeuvis assigned with the color w(uv). The rainbow antimagic connection number of G, denoted byrac(G),is the smallest number of colors taken over all rainbow colorings induced by rainbow antimagic labeling ofG. In this paper, we show the exact value of the rainbow antimagic connection number of jahangir graph J2,m, lemon graphLem,firecracker graph(Fm,3), complete bipartite graph (K2,m), and double star graph (Sm,m).
The vertex coloring of local antimagic total labeling on corona product graphs
Authors: Agustin Ika Hesti , Dafik  , Nisviasari Rosanita , Alfarisi Ridho , Marsidi
Published: March 2021

Let G be a graph with the vertex set V(G) and edge set E(G). A function h is a bijective function of domain the union of vertex set and edge set of G and range the natural number {1, 2, 3,… , |V(G)| + |E(G)|. We called the function h as a vertex local antimagic total labeling if for any two adjacent vertices x and x‘, w(x) = w(x’), where w(x) = ∑e∈(x) h(e) + h(x), and E(x) is the set of edges which are incident to x. It is considered to be a proper coloring on vertices of graph G if we assign colour to all vertices with w(x). The minimum number of colors by the vertex local antimagic total labeling of G is called the vertex local antimagic chromatic number, denoted by Xlat(G). We study on the vertex local antimagic total labeling of graphs and determined chromatic number on some corona product graphs, namely corona (G © Cm) where G is isomorphis with path, star, broom, cycle, and sunlet graph.
On graceful chromatic number of comb product of ladder graph
Authors: Khoirunnisa S , Dafik  , Kristiana A I , Alfarisi R , Albirri E R
Published: March 2021

Let G be a connected and simple graph. Proper vertex colouring c : V(G) — {1, 2, 3,…, k} where k → 2 that induces a proper edge colouring c’ : E(G) — {1, 2, 3,…, k — 1} define by c’(uv)=|c(u) — c(v)|, where uv in E(G) is called graceful k— colouring. Graceful colouring is a vertex colouring c of graph G if c is a graceful k-coloring for some k ∈ N. Graceful chromatic number of a graph G, denoted by χβ
(G) is the minimum k for which G has a graceful k—colouring. In our paper, we investigate the establish exact value of graceful chromatic number of comb product of ladder graph.
Implement of the transformation for markerless facial motion capture in 3D animation
Authors: Intyanto G W , Yuniarti D A F , Pawening A S
Published: March 2021

Motion capture is a motion assisting technology that can resemble the motion of objects being captured and is now widely used for film development, especially in visual effects or animation. From that, the author has the idea, namely to use a Blender application to implement a markerless facial motion capture on motion of object 3D modeling based on webcam because it didn’t have a menu or feature for markerless motion capture. Markerless is meant to process the assignment of annotation points to objects with a computer system so that this method is very simple and saves time in its operation, especially in facial motion capture. In this research, the face detection method uses haar cascade and to provide facial landmark annotation using detector landmark lbf model. We are using an example of 3D modeling a human face that has a bone on the neck, head, mouth, eyes, and eyebrows that will follow the movement of the human face. The combination of face landmark detection and rigging in 3D modeling a human face uses the transformation geometry method to produce real-time motion. From this research study, 3D animated face objects can follow motion on real face targets but there is still noise.
The SME performance recommendation system facing the 4.0 industrial revolution uses the Fuzzy ANP method
Authors: Kustiyahningsih Y , Anamisa D R , Mufarroha F A
Published: March 2021

Madura is one of the regions in East Java Province whose economy is supported by the SME sector. Industrial Revolution 4.0, this refers to the concept of using the internet for various things, as well as cloud-based and smart manufacturing. The agency has difficulty in identifying needs of Batik UKM, so a performance recommendation model for Batik SMEs is needed to assist Dinas and UKM players in making decisions to determine the performance improvement of Batik SMEs. The purpose of this study is to determine recommendations by measuring the performance of MSMEs in facing the industrial revolution 4.0. This performance measurement is based on 9 indicators, namely Employee Training or SME owners, Number of Batik Motif Variations, Number of Consumers, Product Brands or Branding, Owner Education, Number of Information Technology Certified Employees, Owning a Markerplace, Online Marketing, and Online Payment. The method used in this research is the FANP method. Fuzzy has excellent performance, the decision-making process is more flexible, and is able to handle data that contains uncertainty and inaccuracy by making decisions based on many criteria. The advantage of ANP is that there is dependence and feedback between each criterion, so that all criteria are calculated proportionally. The results of this study are the weighting of priority indicators on all indicators that affect the industrial revolution 4.0. Based on the research and consistency ratio tests, the main indicators needed for SMEs in Bangkalan Madura to face the industrial revolution 4.0 are marketplace, online marketing and information technology certified employees.
Analysis mathematical communication ability of vocational student in osborn learning based on adversity quotient
Authors: Yuniarti D A F , Putra B J M
Published: March 2021

In the global era, vocational students are required to be able to compete and have more abilities. One of them is mathematical communication skills in learning mathematics courses. However, vocational students’ mathematical communication skills are low because students find it difficult to put mathematical problems into mathematical ideas or ideas. Adversity Quotient (AQ) is intelligence in facing difficulties. The Osborn model is a learning model that prioritizes students to have an opinion. Osborn’s learning model with brainstorming techniques can train students to create ideas in a short time. This study aims to test the effectiveness of Osborn’s learning in improving mathematical communication. The method used in this research is the Concurrent Embedded Strategy Mix Method. The subjects of this study were students of AKN Pacitan. Based on the data analysis, it was found that the effectiveness of learning was seen from the completeness of the students’ mathematical communication skills, 1) Osborn learning proved to be effective because of a) more than 75% of the experimental class students achieved completeness, b) the average value of the experimental class mathematical communication skills was better than in the control class, c) AQ in the experimental class is better than the control class and d) the difference in communication skills at the beginning (pre-test) and the end (post-test) of the experimental class is better than the control class. 2) The subject of the quitter category has not been able to meet almost all indicators, the camper category is quite capable of several indicators, and the climber category can meet all indicators of mathematical communication.
The development of tangram-based geometry test to measure the creative thinking ability of junior high school students in solving two-dimentional figure problems
Authors: Cahyanita E , Sunardi S , Yudianto E , Aini N R , Wijaya H T
Published: March 2021

Geometry is a branch of mathematics that demands creative thinking. Teachers need a geometry instrument that is fun, simple, and meaningful to measure the creative thinking ability of junior high school students. This developmental research used a 4-D model consisting of defining, designing, developing, and disseminating the tangram-based geometry test. This research was intended to describe the process of developing a tangram-based geometry test. Tangram-based geometry test development included validation by experts. The product has passed the validation stage and obtained a score of 4,47 (scale 1-5), so it was feasible to use. Research try out subjects were 3 out of 30 students who were VIII grader at junior high school that was chosen due to van Hiele levels. Data on students’ creative thinking profile acquired through tests and interviews. Fluency, originality, flexibility, and elaboration are the aspects of creative thinking ability. The results showed that in solving tangram-based geometry tests, a student at the creative level (level 3) satisfied all aspects of creative thinking, a quite creative student (level 2) satisfied fluency and flexibility aspects, and almost uncreative student (level 1) satisfied fluency aspect only. According to the results, this developed tangram-based geometry test was valid, feasible, and effective to measure junior high school students’ creative thinking ability.
Analysis of students’ mathematical critical thinking ability on the problem of algebraic factorization and implementation of cooperative learning in the type of student teams achievement divisions to improve students’ critical thinking ability
Authors: Royhana U , Sumiharsono R , Septory B J
Published: March 2021

Critical thinking in learning is very necessary because critical thinking is an asset for students to be able to develop knowledge widely. The cooperative learning model of the student team achievement division type is one of the learning models used to optimize learning. This study aims to study students’ critical thinking ability and the application of the cooperative learning model type student teamsachievement division on algebra factorization material. This research uses a mixed method that combines quantitative and qualitative methods. This study involved 64 respondents who were divided into control and experimental class. The control class consisted of 32 students and the experimental class consisted of 32 students. The results showed that there was a significant difference, as seen from the independent t-test scores on the post-test. The data analysis shows that the value of the independent sample t-test from the post-test is sig. 0.011 (p ≤ 0.05), Therefore significant. Thus, there is an effect of the application of cooperative learning type student teams achievement divisions in increasing students’ critical thinking skills in solving problems in algebraic factorization material.
On division operation of any numbers: introducing a new technique
Authors: Safiati O A , Dafik  , Prastiti T D
Published: March 2021

There are four basic mathematical operations. One of them is a division operation. A division is an invers operation of multiplication. The symbol of division operation is: or /, thus we can write the division of any two numbers as x:y or x/y. This operation is taught in a school from elementary to high level. Most students consider the mathematical operation of division is one of a complex operation. Many techniques are given such as direct technique by means of repeated subtraction, and ‘porogapit’ technique. Those techniques have been well-known and can be found in the students school text book or in the internet. In this paper, we develop a new technique namely a reminder-like theorem, and some other specific techniques for specific numbers. Those new techniques show the effectiveness in solving division problem, and it gains more efficiency in terms of algorithms.
The study of the implementation of research-based learning model to improve the students’ proving skills in dealing with the resolving efficient dominating set problem
Authors: Hakim R A , Dafik  , Tirta I M
Published: March 2021

Research-based learning (RBL) is one of a student-centered learning (SCL) method that involves research in the learning process. One of skills that can be developed through RBL model is proving skill. The student’s mathematics proving skill needs to be trained and developed because mathematics is a science that includes definitions and statements that need to be proved. This research was conducted to determine the effect of RBL implementation to improve the student’s proving skill in dealing with resolving efficient dominating set problems. The research was used mixed methods by combining qualitative and quantitative methods. The subjects of the study were divided into two classes, namely 23 students in the control class and 20 students in the experimental class. The homogeneity test of the pretest results for two classes showed p - value of 0.43 09, so that the variants of the classes was homogeneous. The independent t-test on the posttest results of two classes showes p - value of 0.00861 5 (p ≤ 0.05 ). It can be concluded that there is an effect of RBL implementation to improve the students’ proving skills in dealing with resolving efficient dominating set problems.
ScEd-ALS as ubiquitous learning in science
Authors: Zulfiani  , Suwarna I P , Miranto S
Published: March 2021

The use of technology in education can be carried out through various telematics networks. The use of hypermedia or web (e-learning) and computing on mobile allows the subject matter to be distributed to students quickly, not limited by space and time. Independent learning is possible to occur. This paper aims to inform the framework of curriculum development at the Science Education Adaptive Learning System (ScEd-ALS) version of the smartphone that supports Ubiquitous learning. The research method used is development research. The research instruments included: observation sheets, checklist sheets, and VARK questionnaire. The results of the study: The ScEd-ALS curriculum development framework that accommodates the VARK Flemming learning style preferences of students. This curriculum framework is the foundation for the development of the smartphone version of the ScEd-ALS media prototype. This research was validated by material experts and media experts and was declared worthy of being tested. The curriculum development framework in this media has provided the right teaching materials, and it is easier to create a new environment that adapts to the learning style preferences of students.
Identification of Intelligent Participants Using Profile Matching Method (Case Study at Senior High School 1 Sungai Aur)
Authors: Putra Nursaka , Nas Chairun , Alwendi  , Samosir Khairunnisa , Aldo Dasril
Published: March 2021

Determining the right candidate as an envoy to take part in a quiz contest can increase the chances of becoming a champion. To achieve these opportunities the school must be more selective in choosing the students who excel in the subjects to be contested. In the selection of students, intelligent representatives are usually the school only takes students who get the first rank of each class, even though it is not necessarily that the students master the lessons to be contested. Can help Senior High School 1 Sungai Aur in making quick and accurate decisions for the selection of representatives of quiz competition. Data obtained from the Senior High School 1 Sungai Aur in the form of student data with a sample of 20 students who have the potential in their respective subjects. Furthermore, the data will be analyzed using the Profile Matching method. The results of this study, it was decided that only 12 participants from 20 samples were passed. Processing results found that there were 3 participants whose decisions were different from those of the school and 9 participants with the same decision. So that the value of data processing accuracy is 75% and an error value of 25% of the 12 participants determined. It can be concluded that this study can help the school to determine students who have the right to represent their school in a quiz competition.
Tape as a Symbol of Luxury and Respect of Gayo Community
Authors: Kasmawati  , Purwaningrum Lulu , Widyastuti Theresia , Handayani Sarah Rum
Published: March 2021

Gayo Lues is aregency that still preserves cultural customs in everyday life and upholds the traditions of their ancestors. The majority of the Gayo people are farmers. They process natural products such as prickly pandan leaves into a product called tape. Tape is used as a wrapper and a rice. The purpose of this study is to determine the function, types, and motifs of tape. The benefits of this research serve as an effort to preserve local culture, and an effort to preserve ancestral heritage for the future. This study used a qualitative descriptive method to describe the importance of local culture. Sociological observation, theoretical and cultural analysis based on intensive field research. Based on the field researchresults, tape has several functions. First, tape is used as rice wrappers, envelopes for invitations to traditional events and as a container to store plain flour that is served to newlyweds at weddings. Second, there are three forms of tape in general, namely ucak, kul and dere. Third, tape has various motifs called sesiku, matapat, bunge terong and special motifs such as bebalun which is only used as a substitute for invitation letters. Tape bebalun is perceived as a symbol of luxury and respect among the Gayo community. This can be seen from the use of tape to invite close relatives to attend traditional events in Gayo. The role of tape in the Gayo is very important because it is an identity and symbol of the Gayo community’s customs.