bluuebunny/crossref_metadata_2025_split huggingface dataset:
Exploring the Predictors of Consumers’ Purchase Intention of Terrestrial Digital Decoder
Authors: Ariansyah Kasmad , Wardahnia  
Published: March 2021

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

AbstractLetG(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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

AbstractIn 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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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.