bluuebunny/crossref_metadata_2025 huggingface dataset:
Virulence of Spodoptera Litura Nuclear Polyhedrosis Virus (SLNPV) with kaolin as carrier material on spodoptera litura and tetragonula laeviceps on soybean
Authors: Erdiansyah I , Syarief M , Taufika R
Published: April 2021

The objective of research is determined the virulence of different concentrations of SlNPV-JTM 97C with kaolin as carrier material onS. litura and T. laevicepsmortalityon soybean. The Research was conducted in Plant Protection Laboratory of State polytechnic of Jember, from June to September 2020. The lethal concentration (LC50and LC95) SlNPVusing Polo Plus 1.0, with the IRAC version 3, method number 008. TheS. lituramortality test used Completely Randomind Design with 5 treatments and 3 replications. The treatments were contamination of larvae diet by SlNPV with control (the third instar larvae without contamination SlNPV), 0,1%, 0,2%, 0,3% and 0,5%. These concentrations are equivalent to the concentrations of 0.1.2x 108PIBs/g, 2.4x 108PIBs/g, 3.6 x 108PIBs/g and 6.0 x 108PIBs/g, respectively. Each test was repeated three times. Mortality percentage of larvae were observed as experiment data. Those data were analyzed by Analysis of Variant and Least Significant Difference (LSD) 5%. SlNPV virulence test againstT. laevicepsusing a concentration that can causeS. lituramortality ≥ 70%. The results of the research indicated that LC50of SlNPV with kaolin as carrier againstS. litura3rdinstar was 0.2%, LC95was 0.5%, effective concentration of SlNPV to controlS. litura3rdinstar was 0.3% to 0.5%, SlNPV concentration at 0.3% to 0.5%, non-toxic toT. laeviceps.
Dose treatment of legume compost with the number of plants per planting hole for land efficiency and increasing sweet corn production
Authors: Kusparwanti T R , Eliyatiningsih E
Published: April 2021

Sweet corn requires large nutrients for growth and production. Legume compost can be used as fertilizer to fulfill nutrients that are beneficial for plant growth. The use of legume compost can substitute NPK elements which function for plant growth. Other efforts that can be made to increase sweet corn production due to the narrowing of agricultural land are to increase the plant population, which is usually 1 plant per planting hole can now be added to 2 to 3 plants per planting hole. The purpose of this study was to determine the best dosage combination of legume compost with the number of plants per planting hole. The research was conducted in an experimental field in Politeknik Negeri Jember. The study was conducted using a factorial randomized block design (RBD) with 2 factors, namely the dose of legume compost and the number of plants per planting hole. From this study there were 9 treatment combinations and 3 replications so that there were 27 experimental units. Anova test results showed that the treatment of legume compost dosage and the number of plants per planting hole had no significant effect on the parameters of plant height, number of leaves, corn cob length, corn cob weight, corn cob diameter, and sweetness level, but had significant effect on the parameter of corn cob production per unit observation.
The increasing fertility of sandy soil and chili production through the application of organic fertilizers, zeolite and cane blotong
Authors: Sukri M Z , Firgiyanto R , Sugiyarto  , Rohman H F
Published: April 2021

The aim of the research was to determine the increase in soil fertility and chile production on sandy soils due to the effect of giving organic matter, zeolite sand and cane blotong. The research started in May-November. The research was conducted in a greenhouse using a completely randomized design. The treatments given were the dosage of organic fertilizer (20 and 40 tonnes ha-1); the zeolite doses (20 and 40 tonnes ha-1) and cane blotong (20 and 40 tonnes ha-1). The observation variables included the level of soil fertility before and after and the chili production variable. The results of this study were the application of organic fertilizers, zeolites and cane blotong increased physical and chemical properties of sandy soil occurred after treatment. The effect of various treatments was only able to increase chili/fruit weight and chili fruit diameter, whereas zeolite was only able to increase the weight / plant of chilies and the number of chilies.
Emission characteristics and fuel consumption of biodiesel obtained from fish canning industry waste in agriculture diesel engine
Authors: Udin A R A , Zain A T
Published: April 2021

Increasing the need for fuel oil is something that can’t be avoided, while the supply of fossil fuels is running low. Biodiesel is one of the right solutions to overcome this problem. This vast ocean in Indonesia, makes Indonesia the potential to create biodiesel from fish canning industry waste. The purpose of this research is to analyze the effect of dexlite fuel mixture with biodiesel from fish canning industry waste on fuel consumption and exhaust gas opacity in agriculture diesel engines. This type of research uses experimental research. The object of this research is the exhaust emissions and fuel consumption. The results of the study obtained by the researchers are the results of mixing dexlite of Pertamina (gasoil/high speed diesel oil) fuel with biodiesel of fish waste oil to be used in diesel engines. The highest exhaust gas opacity results in a mixture of 70% dexlite with 30% biodiesel (B30) of 2.6% at 1000 RPM (± 5). The results of the test fuel consumption that most quickly runs out occur in pure dexlite for 131 seconds in 10 ml of fuel at 1000 RPM (± 5). The results of testing the exhaust gas opacity level are increasing, as well as the results of testing fuel consumption which is increasingly economical, due to the high water, carbon and ash content in biodiesel.
Stuck pipe optimization using duellist algorithm
Authors: Biyanto T R , Cordova H , Matradji  , Anggrea T O , Suryowicaksono H , Irawan S
Published: April 2021

Stuck pipes are one of the most serious drilling problems, stuck pipes can cost the oil industry hundreds of millions of dollars per year. One way to avoid the risk of a stuck pipe is to predict the condition of a stuck pipe with the available drilling parameters. Throughout the years, a lot research has been dedicated to finding the causes that lead to stuck pipe events. But it still not reached the study in the calculation of the optimization of drilling operation costs. In this final project, Artificial Neural Network (ANN) is used for prediction stuck pipe and optimized using the Duellist Algorithm (DA). As well as Increasing fewer data that will get easier to make it in to the model. In this model, it use 1 The input layer contains 12 input nodes, 14 hidden layers trained with 1 to 30 hidden nodes, and 1 output layer in 14 hidden layers with an RMSE value of 0. At the end of the optimization, the lowest cost is USD 17300 / hour at RPM 195, 69, and mudflow 722.28 GPM. As well as constraint conditions are maintained and not stuck.
Utilization of field seismometers for measuring the paraseismic vibrations of mining blasts
Authors: Molinek O. , Vokurka M. , Mokrosova A. , Kotrbanec J.
Published: April 2021

The Hrabuvka Quarry was one of the quarries on which the seismic effects were measured when performing large-scale blasting operations – bench blasting. These measurements were carried out as part of a university project to investigate further unfavourable seismic effects of blasting operations with respect to the type of ignition and explosives used. The aim of this article is to determine whether during the large-scale blasting operations from April to June 2019 vibration speed values were measured, which could have adverse effects on quarry structures and to propose a suitable solution to reduce these values, for example by changing the type of ignition from non-electric to electronic and by changing the ignition timing of individual charges.
Models and algorithms of choice of development technology of deposits when selecting the composition of the backfilling mixture
Authors: Kongar-Syuryun Ch. , Ubysz A. , Faradzhov V.
Published: April 2021

The analysis of the applied development systems in the extraction of minerals is carried out. The main problems arising during the development of mineral deposits are formulated. A method is proposed that allows solving the problem of choosing a technology for developing a mineral deposit and selecting a rational composition of a filling mixture for given filling parameters. The structure of the methodology includes fuzzy models and algorithms that ensure the processing of large amounts of information, form the significance of environmental factors (organizational, mining and geological, production, technical and economic indicators), design and technological parameters of the development system and allow to establish the main interdependencies between them, which, in contrast to the existing ones, allow assessing the integral indicators of the project already at the first stages of selecting the composition of the filling mixture. A structural representation of a design solution model for the development of a mineral deposit is formulated, built on the basis of a system analysis and formalization of mining, geological, technological and external conditions of the deposit, which makes it possible to provide a comparative assessment of the integral indicators of projects. The information structure of the project variant is also recommended. To consider the influence of each factor in the algorithm, it is proposed to apply the coefficient of significance of technical and economic performance indicators.
Preliminary research to determine the thermal condition of the belt conveyor’s drive unit in an underground hard coal mine
Authors: Stempniak M. , Zhironkin V. , Trzop K. , Szurgacz D.
Published: April 2021

The paper presents preliminary research conducted to determine the thermal condition of the main belt conveyor transporting coal from the longwall. The results show the thermal condition of the conveyor and in the further stage are used to effectively diagnose possible causes of damage to the belt conveyor’s drive unit. The tests were performed on the conveyor whose operation is strategic to the mine. The research comprised a thermal imaging camera that allows taking contact-free measurements. The main purpose of a thermal imaging measurement is to detect changes in thermal conditions without the need to stop the conveyor belt. The paper presents the methodology and discusses the manner of performing underground measurements as well as a procedure for processing the results. The final conclusions concerning the technical condition of the drive unit were based on the results and their analysis.
Increasing the stability of mine stopes by injection hardening of the near-contour mass
Authors: Melnik V. , Grechishkin P. , Gornostaev V. , Shcherbakov V.
Published: April 2021

The possibility of improving the mechanization of strengthening the near-contour mass of stope is considered. Variants of improving the supply of injection solution into the mass are proposed, various technological schemes for supplying the injection solution into the near-contour mass are considered, and an optimal injection scheme is proposed. A classification of injection solutions is made in terms of the possibility of their use in rocks of different stability and injection technology.
Analysis of historical changes in the limit value of nitrogen oxides concentrations for underground mining
Authors: Banasiewicz A.
Published: April 2021

Providing adequate ventilation in underground mines is a growing problem. The constantly increasing depth of exploitation is a challenge for ventilation services. However, not only the depth of exploitation, but also the increasing knowledge of the impact of noxious factors on the health of employees contributes to the constant changes in the values of permissible concentrations of gases to improve working conditions. One of the main hazards to which the restrictions are introduced is the gas hazard. Nitrogen oxides are one of the most important gas compounds that occur in underground mining plants. The article will present the beginnings of recognizing hazardous gases as harmful and the history of limiting the concentrations of these compounds in underground mines. The restrictions concern compounds from the NOx family, such as nitrogen oxide (NO) and nitrogen dioxide (NO2). The concentration limits in force in Poland refers to both European directives and regulation acts issued in our country. The subject of nitrogen oxides in the world has recently been very important, and in Poland, it mainly concerns copper and salt mines. Although research has not yet been officially carried out to identify the sources of nitrogen oxide emissions in mines, it is recognized that most of these compounds come from exhaust gases produced by self-propelled mining machinery with diesel engines. It is presumed that nitrogen oxides enter the mine atmosphere also through a blasting and from the natural outflow of these gases from the rock mass. The presence of nitrogen oxides in the mine atmosphere in Polish copper ore mines is related, among others, to the mineral o the mineral mining cycle.
New methodology of simplified rock tests to determine bearing capacity in embankments and excavation bottoms
Authors: Garrido C. L. , Morilla I. , Galindo R. A.
Published: April 2021

Engineering works and projects placed in rock terrains require conventional rock testing for its geological and geotechnical characterization. These tests are well-known and used in practice, but they have notable drawbacks such as high execution costs and large amounts of time required. In this research, a new methodology of simplified rock tests is presented to solve the main disadvantages of conventional rock testing and to provide useful outcomes in practical applications. The simplified rock tests proposed were developed by Professor Morilla, being a set of simple, quick, and cheap tests whose results are obtained with relative scoring systems. Furthermore, correlations with the bearing capacity in embankments and excavation bottoms have also been developed, based on the simplified rock test scores exclusively. These correlations do not include units about their magnitude, but they represent quantitative approximations about their field of application. Therefore, this new methodology is not considered as a self-sufficient design procedure for embankments and excavation bottoms. This paper covers the description of each simplified test required to obtain the bearing capacity in embankments and excavation bottoms, including the tools, steps to follow, scoring system, and the parameters and hypothesis established in the proposed correlations.
Review of the state of the art: empirical formulations for the estimation of rock mass deformability by means of dynamic testing
Authors: Esteban N. , Galindo R. A.
Published: April 2021

This paper is focused on the empirical formulations for the estimation of rock mass deformability dependent on data obtained from dynamic methods. The fundaments of dynamic testing, as well as their advantages and limitations, are reviewed. Based on the results of recent studies, a discussion is made on the relationship between dynamic and static deformation moduli, and their dependency on factors such as lithology, weathering, or presence of discontinuity surfaces. The most significant empirical formulations published to this day are summarized, alongside a critical exposition of their characteristics, and a statistical analysis of their results is undertaken. As a result, the influence of the lithology as a crucial factor in the determination of the deformation modulus is highlighted. Thus, it must be properly considered when adopting a formulation for the estimation of the deformability behaviour of a rock mass.
Development of a Building Topological Model for Indoor Navigation
Authors: Trybała P. , Gattner A.
Published: April 2021

Human high mobility is essential to the proper functioning of a modern world. For a fast and effcient ground transportation, a suitable and accessible positioning, route finding and navigation solutions are crucial. For outdoor traveling, mobile applications utilizing GNSS systems and navigation services based on road and pavement networks already provide a satisfying solutions. On contrary, an indoor environment is much more intricate. Localization with GNSS is impossible and there is no explicit traversable network inside the building as in outdoor routes. Multi-storey buildings, often with complicated room layouts and floor transitions, confined spaces and numerous areas restricted for visitors or impassable pathways for disabled people add another layers of complexity to this problem. This study covers the issue of creating a topological building model for indoor navigation. Necessities of such a model are discussed and the fitting i mplementation, developed by ESRI, is detailed. The entire process, from data pre-processing to the model creation and visualization in ArcGIS Pro software, is delineated. A case study of development of such a model for a Geo-3EM building of Wrocaw University of Science and Technology (WUST) is conducted and the sample visualizations of a model and route finding are shown. Finally, the results are discussed and the future directions of research are presented.
Development of low-cost Unmanned Surface Vehicle system for bathymetric measurements
Authors: Wajs J. , Kasza D.
Published: April 2021

Bathymetric measurements are a significant branch of geodesy. They provide information required for the modeling of terrain topography below the water level for both running (lotic) and standing (lentic) waters. The existing technology allows the development of autonomous bathymetric systems which integrate Global Navigation Satellite Systems (GNSS) sensors, an echosounder/sonar and a floating platform. Such a solution has been designed at Wroclaw University of Science and Technology. BATDRON – an integrated bathymetric system – is a low-cost solution. The hull is in the form of a catamaran, which ensures high stability during measurements. The navigation module was based on the Ardupilot APM platform and was integrated with a propulsion system consisting of two T200 thrusters manufactured by Bluerobotics. The main sensor set uses a Satlab SLD-200 singe beam echosounder synchronized with a Trimble R6 GNSS antenna for both navigation and recording the position of the echosounder pole.
Potential possibility of using terrestrial laser scanning in petrography
Authors: Tolisz J. , Kasza D.
Published: April 2021

Terrestrial laser scanning is a wide spectrum tool, applied at present both in engineering and medicine. This work presents the results of a laboratory test that was aimed at assessing the potential of using this measurement technique for the identification of petrographic varieties. Rock samples were measured with the application of a Leica ScanStation C10 scanner. Values of the intensity index obtained from point cloud data were subject to statistical analysis. The main focus was posed on comparative analyses of samples from the same petrographic varieties collected from different localities, as well as on the influence of colour and surface humidity of the samples on the change of intensity index values.
Flood Damage Assessment for Pergau Hydroelectric Power Project using HEC-FIA
Authors: Sidek L M , Yalit M R , Djuladi D A , Marufuzzaman M
Published: April 2021

Dams play a vital role in our modern life but it may fail in any undesirable situation and have a disastrous effect on society, economy and environment. As most of the dams in Malaysia undergo aging factors, the integrity of dams should be examined. This research assesses the flood impact analysis on direct damages and loss of life (LOL) for the Pergau Hydroelectric Dam breach under the probable maximum flood (PMF) scenario using Hydrologic Engineering Center’s Flood Impact Analysis (HEC-FIA) software. The results are also compared with the United States Bureau of Reclamation method. The model was populated with inundation and flood arrival time grid, LOL parameters and structure inventories as input and the simulation results showed that 17 affected villages would subject to direct damage of RM 79,433,437 and 380 LOL. The percentage difference between the two methods is 2.75% for direct damage and 4.12% for LOL.
Tourism Branding: A Strategy of Regional Tourism Sustainability Post COVID-19 in Yogyakarta
Authors: Isdarmanto  , Susanto D R , Kiswantoro A
Published: April 2021

This research examines how regional tourism management has a business strategy to be able to maintain the continuity of the tourism business after the COVID-19 pandemic by empowering the role of Penta Helix. The local community must care and have the awareness to maintain tourism destination development through a good branding strategy. Penta Helix still maintains the survival strategy of the tourism community in a global competition that must be increasingly competitive. Based on an intensive study of the impact of the corona covid-19 virus which is empirically related to unique and region-specific cultural attitudes that must be maintained. This study uses a qualitative research type in accordance with the variety and breadth of research objects in marketing branding management. In addition, through post-Covid-19 research, it is hoped that strategic innovations can be created to build tourism competitiveness advantages as expected.
Tourism Hospitality Industry Supply Chain in Pandeglang Regency After Tsunami 2018
Authors: Rosyidie A , Sagala S , Azhari D , Ramadhani A , Prabu A , Novianto K , Rinaldy T K
Published: April 2021

One of fastest growing tourism economic zone is Tanjung Lesung, located in Pandeglang Regency, Banten. Besides Tanjung Lesung Special Economic Zone, Pandeglang Regency has many tourism potentials, which contributes significantly to the regional revenue. As a critical element of tourism, hotels provide accommodation and services for tourists. To provide the services, the flow of goods, services, and information must be designed efficiently and effectively. Unfortunately, the December 2018 Sunda Strait tsunami had impacted hospitality industry and its supply chain severely since then. To support the recovery from the impact of the tsunami, it is important to understand the relationship between each component in the hospitality supply chain in Pandeglang. Hence, this study aims to identify the hospitality supply chain in Pandeglang. The study uses the qualitative approach to describe the main components of the hospitality supply chain and with samples of interviews mostly from official governments and other related organizations within the industry. The result finding indicates that the components in the hospitality business in Pandeglang consist of three main components, namely: supplier, distributor, and customer. In addition, the relationship between components can be more efficient to increase product competitiveness in the tourism market and to support the Pandeglang recovery.
Ant Colony Optimization Algorithm Implementation for Distribution of Natural Disaster Relief Logistics in Jombang Regency Web Base
Authors: Ali M , Sucipto H
Published: April 2021

Ten sub-districts in Jombang, Indonesia, namely jombang downtown, Bareng, Wonosalam, Mojoagung, Mojowarno, Ploso,Kudu, Bandarkedungmulyo, Sumobito dan kesamben experience the impact of natural disasters of floods and landslides each year. All of these sub-districts consists of 32 villages. Disasters that become an annual routine, namely floods and landslides, make residents suffer moral and material losses. The Regional Disaster Management Agency (BPBD) is the main actor in helping this disaster such as donors who want to help the victims of natural disasters is accommodated by BPBD with the aim of equitable distribution of aid and on target. However, the practice in the field encountered obstacles namely not finding the shortest track from the location of the natural disaster to be visited in accordance with the track and logistics needs at the disaster site. The Ant Colony Optimization (ACO) algorithm is used by researchers to solve the problems encountered by Jombang BPBD. There are 6 iterations in implementing this algorithm. ACO algorithm test outcomes to find the track in the distribution of logistics to the disaster location that obtained the value of the number of ants 10, the initial pheromone of 0.117 from C greedy obtained 85,5 and the distance obtained from the google map. With the ACO algorithm found 3 alternatives for logistics distribution tracks in natural disaster areas in Jombang.
HVAC interference assessment on a buried gas pipeline
Authors: Abdullah N
Published: April 2021

A pipeline, railway or telecommunication cable (referred to as victim line) sharing a common corridor with ac power transmission or distribution lines captures a portion of the electromagnetic field energy surrounding the power lines in the air and soil. This captured energy, often designated as ac interference, can result in an electrical shock hazard for people touching the victim lines or metallic structures connected to them. Furthermore, excessive stress voltages across rails, telephone pairs or pipe walls and coating surfaces can result in degradation or damage to equipment and puncture of pipe coating, leading to accelerated corrosion and can damage insulation flanges and rectifiers. The main objective for this study is to analyse proximity effect from a proposed double circuit transmission lines in different scenarios, which are steady-state, fault conditions and lightning strike. Induced voltage and currents on a gas pipeline to be determined using Current Distribution, Electromagnetics and Soil Structure Analysis (CDEGS) software.
Analysis of Future Income Forecast for Indonesian Tourism Industry – A Neural Network Research on Tourism Digital Economy
Authors: Hidayat T , Mahardiko R , Alaydrus M
Published: April 2021

Information Technology (IT) is an enabler for Indonesian tourism industry. Before Covid-19 pandemic, the industry already felt the effect of IT. The pandemic changes the global industry situation. This paper presents mathematical model on the number of tourism start-up, the number of local and international tourists, and national Gross Domestic Product (GDP). The results of this study show that while there are problems because of Covid-19 pandemic in the following year, the future income of tourism industry shows steady growth. The model can be used by other industry for better analysis.
Indonesian’s Parent Consideration: The Decision About Private University Choice for Their Children
Authors: Jati R P , Vera N , Mariani D
Published: April 2021

This scientific article results from research based on what factors are considered by parents in choosing private universities in Indonesia. This research is a quantitative study using a survey method. Data were analyzed using Factor Analysis. The steps in this research begin with a literature study, determining variables and indicators. Researchers collected data by distributing questionnaires that were presented by existing facts, organized and systematic. Based on factor analysis through statistical tests, it shows several factors that are considered by parents in choosing private universities, namely academic (product), promotion, registration and lecture processes, tuition fees (economy), campus location, and lecturer reputation. Based on the level of importance of the factors, it is known that promotion and product (academic) factors are the main variables on which parents choose private universities for their children; The next factor is the registration process and the learning process.
The Design of Recognition System of Children Basic Activities Based on Virtual Reality
Authors: Martono K T , Eridani D , Isabella D I S , Alfian H
Published: April 2021

An early introduction to children’s basic activities, including brushing teeth, washing hands, and eating a meal using a spoon, is deemed important. Many methods can be used to introduce these activities, one of which is by using video. The development of Virtual Reality technology provides a new experience in interacting and using computer-based applications. Users can feel the sensation of being in the real world when using the application. This paper discusses designing a recognition system for children’s basic activities through VR technology. The method in the design process used the HCD (Human Center Design) method. System testing was emphasized on the user experience (UX) aspect of the application with the teachers at the early childhood education and kindergarten level as the target respondents. UX testing was conducted by taking the parameters of Attractiveness, Perspicuity, Efficiency, Dependability, Stimulation, and Novelty. The results obtained showed 1.41 points for attractiveness, 1.80 points for perspicuity, 1.28 points for efficiency, 1.80 points for Dependability, 1.49 points for stimulation, and 1.39 points for novelty. So that this application can be used as a medium in introducing basic activities to children.
Digital competency of educators in the virtual learning environment: a structural equation modeling analysis
Authors: Hizam S M , Akter H , Sentosa I , Ahmed W
Published: April 2021

This study integrates the educators’ digital competency (DC), as an individual characteristic construct of the task-technology fit (TTF) theory, to examine a better fit between Moodle using and teaching task, and to investigate its effect on both Moodle’s utilization and their task performance. For assessing our proposed hypotheses, an online survey was conducted with 238 teaching staff from different departments of universities in Malaysia. Using Structural Equation Modelling (SEM), our analysis revealed that all the proposed components (i.e., technology literacy, knowledge deepening, presentation skills, and professional skills) of digital competency significantly influenced the TTF. The Task-Technology Fit was also found as an influential construct, which positively and significantly affected both Moodle’s utilization and teachers’ task performance. Besides, Moodle’s utilization was confirmed to be a substantial determinant of the performance impact. In the end, this study included limitations and future directions based on how the study’s contribution can support academics and practitioners for assessing and understanding what particular components of digital competency impact TTF, which in turn may influence the system’s utilization and performance impact.
Toward New Normal: Bali Tourism Goes Extra Mile
Authors: Handayani F , Sylvina V , Lestari A
Published: April 2021

The tourism industry has undeniably received a hard hit due to the Covid-19 pandemic. Bali is one of Indonesian major tourism destinations, depending on tourism sector for its regional income. The pandemic has paralyzed tourism in Bali. This research aims at exploring how the crisis responses, especially the crisis communication strategy used to manage crisis and regulate its impacts. A qualitative approach was conducted in this research, data collected through interview, observation and literature study. Result showed that crisis history and crisis responsibility and crisis strategy contribute to behavioral intention and reputation toward tourism.
Analysis Of Public Sentiment About Covid-19 In Indonesia On Twitter Using Multinomial Naive Bayes And Support Vector Machine
Authors: Damanik F J , Setyohadi D B
Published: April 2021

The Covid-19 case which initially occurred in China until now has spread to all continents, including Indonesia. Indonesia itself was first affected by the Covid-19 virus in February 2020 which made a crowd in cyberspace including in particular Twitter. Everyone is free to give their opini or opinions about Covid-19 so that it raises many opinions, not only positive or neutral opinions but also negative opinions regarding Covid-19. Social media is now not only used as a means of making friends or making friends, but also used for other activities. The purpose of this research is to build a sentiment analysis method with the theme of the Covid-19 Pandemic on Twitter social media with the most optimal and maximum accuracy. Meanwhile, the benefit is to help Indonesians conduct research on public opinion on Twitter which contains positive, neutral, or negative sentiments. In this study, Text Mining has been used using the Support Vector Machine and Multinomial Naive Bayes method, which is one of the methods used to conduct sentiment analysis. The results of the Support Vector Machine and Naive Bayes Multinomial method used for sentiment analysis are useful for obtaining information and knowledge about Covid-19. The results obtained are that the opinion of the Indonesian people regarding Covid-19 is that the Positive and Neutral amount is more than the Negative with an average of 40% Positive and Neutral while the Negative is 20%. For the calculation of the F-1 average value, it can be seen that the Support Vector Machine method is the best model in this study with a value of 93%. little difference with the Naive Bayes Multinomial method of 92%. It is hoped that this research will continue with more data and use other sentiment analysis methods in order to find out the average results of the opinions of the Indonesian people regarding Covid-19.
Video-Based Learning That Supports the Success of Flipped Classroom for Non-English Faculty
Authors: Aryusmar  , Luke J Y , Pawestri N , Sela S T
Published: April 2021

This research aims at exploring Video-Based Learning that supports the success of flipped classrooms for Non-English Faculty. This study uses a descriptive qualitative research design with an interpretive-exploratory approach. It was conducted at Bina Nusantara University, Jakarta from March to December 2020. This study begins with the need analysis of qualitative data of the existing course outlines and the comprehensive literature review. After that, this study analyzed the quantitative data collected from the interview of 3 sample lecturers and the questionnaire of 30 sample students. This research found that (1) the Video-Based Learning that supports the success of flipped classroom for Non-English Faculty is urgently needed by students in universities; (2) it should involve some learning characteristics (a) student-centered learning, (b) internet and library access, (c) ecosystem to generate motivation to learn, and (d) contextual learning experiences; and (3) the English Lecturers and Students of Non-English Faculty have positive perceptions on it. Therefore, the Video-Based Learning that supports the success of flipped classrooms for Non-English Faculty should involve some learning characteristics (a) student-centered learning, (b) internet and library access, (c) ecosystem to generate motivation to learn, and (d) contextual learning experiences. The results of this study have implications to provide additional references in making video-based learning that supports the implementation of the flipped classroom.
An Analysis of Customer Satisfaction and Loyalty of Online Transportation System in Pekanbaru, Indonesia
Authors: Hamzah M L , Purwati A A , Jamal A , Sutoyo  , Rizki M
Published: April 2021

This study aims to determine the mediating role of customer satisfaction in the relationship between customer trust and customer experience on customer loyalty in Grab transportation in Pekanbaru. The variables of this study include customer trust, customer experience, customer satisfaction, and customer loyalty. This research was conducted in Pekanbaru City. Data were collected through a questionnaire method which was filled independently of 400 respondents using the census / questionnaire method then analyzed by Structural Equation Modeling (SEM) with the help of SPSS 26.0 and Smart PLS 3.2.9. The results of the analysis prove (1) Customer Trust has a positive and significant effect on Customer Satisfaction, (2) Customer Experience has a positive and significant effect on Customer Satisfaction, (3) Customer Satisfaction has a positive and significant effect on Customer Loyalty, (4) Customer Trust has no effect and not significant to Customer Loyalty, (5) Customer Experience has a positive and significant effect on Customer Loyalty, (6) Customer Trust has a positive and significant effect on Customer Loyalty through the Customer Satisfaction variable, (7) Customer Experience has a positive and significant effect on Customer Loyalty through variables Customer satisfaction.
Measuring and Decomposing SMEs’ Productivity in Creative Economic Sector in Indonesia
Authors: Majid M S A , Faisal F , Fahlevi H , Azhari A
Published: April 2021

This study empirically measures productivity and its decomposition of the SMEs engaged in the creative economic sector across 23 districts/cities in Aceh province, Indonesia over the period 2014-2018. Using Data Envelopment Analysis (DEA) to measure the Malmquist Total Factor Productivity (TFP) index, the study documented a low productivity level SMEs across the province. Although the technical efficiency showed a positive trend, but the declining in their efficiency level has caused only a slight increase in the TFP of SMEs over the study period. These findings suggested that to improve their productivity; the SMEs should continuously enhance efficiency level and technical efficiency by implementing good business governance principles and extensively utilizing ICT facilities, such as online sales and internet of things in their marketing activities. The SMEs should fully utilize existing capital and properly selected and mixed inputs to produce maximum output. Finally, the government should give priority for promoting SMEs in the districts/cities that experienced lower productivity level by providing more financial assistance and regular entrepreneurial and managerial training programs.
The Effectiveness of Multichannel Learning Model at Higher Education
Authors: Ningsih R Y , Rahmat A , Boeriswati E
Published: April 2021

This research aims to know the effectiveness of Indonesian learning at university through a multichannel learning model. The multichannel learning model is a form of blended learning. The research method used is the survey research on 495 students who join Indonesian lecture through the multichannel learning model at Bina Nusantara University. The techniques of collecting data are questionnaire and student learning outcome in Indonesian. The questionnaire is used to assess student’s perception against the effectiveness of Indonesian learning in higher education through a multichannel learning model. While the learning outcome is tested by using the Paired Sample T-Test to find out whether there is an increase in student learning outcome in Indonesian language which is applied with a multichannel learning model. The result showed that student rated multichannel model learning with a combination of combined lecturer (at 69% index), lecturer (at 78% index), discussion forum, and guide self-learning class (on index 68.6%) as effective in improving Indonesian learning outcome in higher education. For the Paired T-test result, it is known that the Sig (2-tailed) value is 0.000 <0.005, so it can be concluded that the multichannel learning model can improve Indonesian learning outcome in higher education.
Comparative Study: Perception on Sustainable Tourism of Urban and Rural Eco-Villages in Bali
Authors: Halim D K , Ervina E
Published: April 2021

This study is motivated by the number of tourist villages in Bali that do not care about sustainability and are not as promoted as eco-villages, instead deteriorating the natural environment due to its development, and aims to analyze the community and tourist perceptions on sustainable tourism in eco-villages of Sanur Kauh village in urban area and of Blimbingsari village in rural area. Differences among community are analyzed based on gender, stakeholder roles, age, and occupation variables, education, tourism conscious. Also, the differences among tourists were analyzed based on gender, origin, age, occupation, education, travel method, and travel urpose. For the two groups, differences in perceptions were analyzed based on the indicators of Attention to Environmental Burden (AEB) and Concern for Conservation Efforts (CCE) that construct the Perceptions of Sustainability questionnaire. The results found that there were significant differences between the Community and the Tourists in terms of AEB (F=26,561; p<0,01), CCE (F=32,508; p<0,01), and Perceptions of Sustainability (F=31,377; p<0,01), and between the community and the community and tourists and tourists both in Sanur Kauh and Blimbingsari in terms of AEB (F = 113,490; p <0.01), CCE (F = 96.540; p <0.01), and Perception on sustainable tourism (F=111,294; p<0,01). However, the difference between the community and tourists in both Sanur Kauh and Blimbingsari only occurred in terms of CCE (F=11.809; p<0.01) and Perception of Sustainability (F=5.831; p<0.05). Thus, the difference in perceptions of sustainable tourism influenced by the village’s location and environment. People and tourists in rural areas have better perception than those in urban areas.
Parking-RR: Mobile Application Malioboro Smart Parking Based on IoT Technology
Authors: Pariama R E , Manaha R , Suyoto
Published: April 2021

Malioboro is one of the very famous tourist attractions in Yogyakarta and very crowded. Having an atmosphere and lots of culinary or snacks makes it a lot to visit, especially on holidays. Helping visitors find an empty parking space in addition to using the parking reservation feature by thinking of time limits and also alternative parking if the parking conditions around Malioboro are full. Internet of Things (IoT) technology and sensors are used to find information about the availability of database updates about parking capacity based on parking bag conditions. This paper tries to discuss and find a solution by offering an alternative, Parking-RR that can help anyone find a parking space according to the type of vehicle based on data obtained from sensors that are installed and can be seen through Cellular Applications. Parking-RR provides a solution for road users to find parking in the Malioboro area. The simple application display makes it easy for users to access.
Analyze and Designing Low-Cost Network Monitoring System Using Icinga and Raspberry Pi
Authors: Maulana H , Al-Khowarizmi
Published: April 2021

The development of information and data communication technology field in the world has now increasingly led to the development of the Internet of Things devices. The development of network technology in an organization/university has triggered the need for a system that can monitor computer networks and their devices in an organization/university environment that is quite extensive and complex. At this time, network monitoring becomes quite difficult to do if the computer network in a corporate environment has become very broad and complex. The wider the network and the complex network and multimedia topology that is built, the more difficult it is for network administrators to monitor the network. However, in its application to build a monitoring system it will require devices and hardware and computer requirements and specifications that are above average, which of course will also require substantial costs and large resources as well. In this research, a network monitoring and bandwidth management system will be built by using Raspberry-Pi and Icinga as the main modules in network management. Raspberry Pi is an alternative of computers that has many capabilities and has a high ability which is generally used as a Mini-Server at a very cheap price when compared with existing servers. And Icinga is an open source-based application platform that functions to monitor various types of variables contained in servers and infrastructure of the network such as availability and performance and provides easy access for network administrators to important data and to improve maintenance of network conditions. So, it is hoped that by applying this, a good and optimal network monitoring and bandwidth management tool can be produced at a low cost.
IoT-Based Monitoring and Design of Automatic Fish Drying Equipment Using Fuzzy Logic
Authors: Alvinika Y , Setyohadi D B , Sulistyoningsih M
Published: April 2021

Fish is a food source that is widely consumed by Indonesians and overseas. Fish is widely liked because fish provides many health benefits. The problem that is often faced is the drying process of fish, so far the traditional manual drying of fish takes a long time, if the drying process uses sunlight, the drying can take a long time between 4-7 days until the water content reaches 10%. One method of dealing with the problem is the design of IoT-based monitoring and the design of an automatic fish drying device using Fuzzy Logic. The temperature and humidity control system in fish dryers to describe the problem of controlling changes in temperature and humidity that fluctuate throughout the day as happened during the transition period. To realize the fuzzy logic on automatic temperature and humidity control in fish dryers, a sensor is needed as the system input in the form of a DHT22 sensor, and a NodeMCU microcontroller is also needed to implement the fuzzy system into a programming language that can be accepted by hardware in the form of a heating element. Internet of Thing (IoT) based fish dryer monitoring system to control temperature and humidity, weather, on fish dryer using a smartphone. From the experiments carried out on system testing by comparing with the thermometer, the relative error rate of the temperature system is 1.62% and the humidity is 1.96% which indicates the system is successful according to the design.
Extending User Coverage on Virtual Campus Using Web3D Technology: A Case Study
Authors: Hananto M W
Published: April 2021

Web3D site which uses standard format has begun to elicit difficulties for some users, coupled with browser compatibility that is increasingly narrowing. This also happened on the sites which represented an institution in the form of a virtual college campus. For the campus Web3D to keep providing its services and facilitate access to more prospective users in the future, an update is needed that requires major changes. This can be done by the use of different technology approach which has wider features and possibilities of use. In this research, an experiment was first carried out to see the prospect of using it on the campus Web3D site. Furthermore, the prototype world using newer format was developed and then tested in a variety of browsers that are currently widely used. The resulting world was able to be displayed on more browsers and platforms, and it kept the same complexity which leads to similar appearance and functionality as the previous one. Performance decrease did occur, so further optimization was needed.
Implementation of Cryptography Merkle-Hellman Knapsack Combination, Discrete Algorithm and ASCII Table Modification for PHP Source Code Security
Authors: Wadisman C , Nozomi I , Rahmawati S
Published: April 2021

The PHP programming language is now widely used by agencies and companies around the world. To distribute applications made using PHP must use the source code so that it is prone to theft of works. If the source code is found by the programmer, it will be a big problem because it can indirectly find a hole in the security of a system from the source code. To solve this problem, the source code was coded so that the source code could not be easily copied by other parties. One of the ways to encode the source uses a combination of the Merklee-Hellman Knapsack algorithm, Discrete Logarithm and character modification to obtain complex encryption