bluuebunny/crossref_metadata_2025 huggingface dataset:
Internet of Thing for the Commando Robot Command System
Authors: Hesti Emilia , Sholihin  , Adewasti  , Sarjana  , Fakhirah Amirah
Published: May 2020

In the current digitalization era, and keep abreast of the industrial 4.0 technological revolution. Wireless communication is now developing very rapidly because of its very efficient use. One of the uses of short-range wireless technology that is widely used is a device that can be integrated with other devices. Communication between robots is the process of delivering information to do commands that are controlled remotely. Communication between robots is an important component in interactions in robots and their environment. In the robotic system, comanndo robots to convey commands to find out the location of the source, for example detecting bombs, detecting metals and detecting suspicious gases, then the commando robot can move to follow orders determined by its master. So that there is a form of communication between robots wirelessly, and this is what is called the internet of things. This form of communication will be a command to the robot commando to follow the movement of the source of detection. The advantage of communication between robots is efficiency in completing the task of knitting. This commando robot uses the Arduino software programming application, so it can make it easier in making commando robots based on the Internet of things.
GIS Android mobile based Software Development for Tourism Objects, Public Places list, Transportations list, and Culinary Places list Using Usability Measurement
Authors: Rudi Sanjaya M. , Kurniawan Dedy , Saputra Ariansyah
Published: May 2020

Android is a mobile operating system used for touch screen based smart phones and computer tablets. The software is built using Java Android Programming language and using eclipse as the development tool. The purpose of this research is to produce a Geographic Application for tourism guidance in Palembang city consisting of tourism objects list, public places list, transportations list, culinary places list and also other helpful features that will help tourists to find the most effective and efficient tourism destinations, The measurement of the software are using usability matrix where the usability criteria used are Learnability, Efficiency, memorability, few error and satisfaction, with Nielsen’s usability measurement so that the software is produced with quality and accuracy to get relevant information about tourist attraction in Palembang City.
Prototype of RFID-Based Parking Slot Availability Detection System
Authors: Lindawati  , Salamah I , Asriyadi  , Fadhli M
Published: May 2020

Radio Frequency Identification (RFID)-based parking slot detection system is a system designed to make it easier for motorists to find out the availability of parking slots and where empty slots are located in a parking lot. Parking lot detection system is used in buildings that have large, multi-storey parking spaces. In its design, this system uses Arduino Mega, photodiode sensor, RFID tag and RFID reader. Information about the parking slots will be notified through the speaker after the driver uses the RFID card at the entrance portal of the parking lot. Based on the results of tests that have been carried out, it is obtained that the detection system for the availability of RFID based parking slots is able to provide information to motorists about the location of the empty parking slots.
Implementation Data Mining With K-Means Algorithm For Clustering Distribution Rabies Case Area In Palembang City
Authors: Rahayu Kintan , Novianti Leni , Kusnandar Meivi
Published: May 2020

This research aims to classify the vulnerability of Rabies cases by using the CRISP-DM methodology through the process of business understanding, data understanding, data preparation, modeling, evaluation and deployment. The data that has the same characteristics are grouped in a single cluster then the data with different characteristics are grouped in another cluster. The algorithm used in clustering technique is K-Means algorithm. In this case, the cluster is divided into three clusters. The first cluster is a result of an expenditure that has an area with very vulnerable cases of rabies, the second cluster is an expenditure result that has an area with the vulnerable level of rabies cases, the third cluster is the result of expenditure has areas with no vulnerable cases of rabies.
Characteristics Comparison of Refinery Asphalt, Rubberized Asphalt, and Buton Asphalt in Stone Matrix Asphalt Pavement with Marshall and Cantabro Method
Authors: Kurnia A Y , Dewi R , Permata D Y , Pataras M , Adelia S
Published: May 2020

The most common flexible pavement used in Indonesia were asphalt concrete and hot rolled sheet, with the most frequently problem caused by the extremely high traffic load. Because of that, an alternative type of pavement needed. Stone matrix asphalt (SMA) is a mixture with gap gradation which contains a large portion of coarse aggregates and forms a skeleton that efficiently spreads the load due to passing vehicles. SMA mixture consists of three types, that is thin SMA, fine SMA and rough SMA. The utilization of several types of asphalt also can be an alternative. In this research will be made a comparison about SMA mixture with buton asphalt, rubberized asphalt, and refinery asphalt based on Marshall properties, followed with Marshall immersion and cantabro test based on the optimum asphalt content. Overall based on the test result, the combination of SMA mixture with rubberized asphalt was the best. It had the highest stability with the lowest optimum asphalt content. While for the marshall immersion test, the stability of all sample after 24 hours soaked in waterbath were decreased. Also based on cantabro test result, the best index of retained strength value were for SMA mixture with rubberized asphalt.
Augmented Reality in the Registration Flow for Enterance Eximination at State Polytechnic of Sriwijaya Based on Android
Authors: Sucihati Rike , Bahri Joni Malyan Ahmad , Cofriyanti Ervi
Published: May 2020

Augmented Reality is a technology that aims to combine digital content made by computers with the real world in real time. Augmented Reality can be applied in almost all areas of life. One of the applications is in the field of providing information. The publication of registration flow for entrance examination at State Polytechnic of Sriwijaya is still using paper media that makes it less interesting on the prospective applicants. Therefore it requires an application based on android to implement the information distribution of registration flow for entrance examination at State Polytechnic of Sriwijaya.

This augmented reality application consists of two menus namely information menu and location menu. Information menu contains motion graphic video of registration flow for entrance examination at State Polytechnic of Sriwijaya and location menu contains 3d object of entrance examination at State Polytechnic registration buildings. The research method is divided into several stages, namely design, asset creation, implementation and testing. At the testing stage is divided into two, namely application testing by testing the functionality of the features provided by the application and testing of respondents to determine the effectiveness of registration flow at State Polytechnic of Sriwijaya compared to paper media seen in the respondent's answer of 88.7%.
Designing and Applying Flood Early Warning System Based on Waterfall and Water Level for Special of Palembang City
Authors: Supani A. , Andriani Y.
Published: May 2020

Palembang has a height of Musi tide surface about 0.7 m to 2.2 m and average high rainfall 101.48 mm/hrs in a year so that it always happens flood every year. In tackling flood, Palembang government has done rehabilitation of canals, river dredging, creation of retention ponds, demolition of illegal building on the banks of river and the extension services provided to the public about the cleanliness of the river, but till now Palembang does not yet implement a flood warning system with electronic and information technology. The flood early warning system that was built for special of Palembang city to sense rainfall and water level as two input variables, and to count rainfall and water level value, and predict flood conditions using fuzzy logic as three output variables automatically. In the test, it was successful measuring water level up to 5 meters and rainfall up to 380 ml/minutes and more, forecasting the three flood conditions namely standby 2, standby 1 and flood. From the results, it can be concluded that flood early warning systems resulted in three conditions that are standby 2, standby 1, and flood. Standby 2 (S2) happened at Y=190 ml/minutes, X=5 m, and Z=3.38, at Y=250 ml/minutes, X=4 m, and Z = 2.25 constant, at Y=310 ml/minutes, X= 3 m. Standby (S1) that happened at Y= 250 ml/minutes, X=5 m, and Z= 0.621 constant, at Y=310 ml/minutes and Y=380 ml/minutes, X=4 m, and Z= 0.621 constant. Flood status happened at Y=310 and 380 ml/minutes, X= 5 m, and Z= 0.621 constant.
2 way Wilkinson power divider for X band navigation radar
Authors: Desvasari W , Sulistyaningsih  , Taufiqqurrachman  , Kurniadi D P , Mahmudin D , Pristianto E J , Daud P , Putranto P , Setiawan A , Darwis F , Wijayanto Y N , Hardiati S , Kurniawan D
Published: May 2020

A compact radar system becomes a necessity in order to build a lightweight navigation radar. Researches were conducted to create an integrated radar system in the form of one board of 9.3 GHz navigation radar system. Microstrip technology was used for its simple structure and miniaturization at high frequencies. Power divider as a part of the radar system was used to divide the signal from Voltage-Controlled Oscillator (VCO) to Transmitter front end and mixer on the Receiver end. This paper proposed the design and simulation of the Wilkinson Power Divider on Duroid RT5880 substrate using Advanced Design System (ADS) software. The S parameters were analyzed to see the performance of the divider. The proposed design already met the expected requirement of the power divider with more than -30 dB return loss, -3.059 dB insertion loss, and -29.541 dB isolation between divider output ports.
An IoT Based Coastal Weather and Air Quality Monitoring Using GSM Technology
Authors: Kusuma H A , Anjasmara R , Suhendra T , Yunianto H , Nugraha S
Published: May 2020

One of Sustainable Development Goals (SDGs) declared by United Nation is Climate Action. Integrated climate change measurement is one of the point in this goal. The solution in this form is low cost and open source hardware to monitor weather and air quality real time. This study goals is developing Arduino platform to monitor wind speed, air temperature, air humidity, and smoke. All circuit board, electronic component specifications, and programming software are open source and freely available for anyone to use and modify. Inexpensive sensors and Arduino Uno were used to develop low cost system. This system send data to Thingspeak as Open Internet of Things (IoT) platform which provide real time data collection, data processing, and data visualization to users. This system provide a low cost solution (system cost around one million Rupiah) to monitor weather and air quality that easily deployed in the desired geographical area. The results are plotted in graphs to ease the users monitor data both locally and remotely. This system use Arduino Uno as main processor, Real Time Clock DS3231 to provide time information, anemometer to provide wind speed, DHT22 used as humidity and temperature sensor, MQ-2 used for smoke detection and CO level, and SIM900 as GSM shield for sending data to server. Results of measurements demonstrate the usefulness of this system in weather and air quality monitoring.
Metaheuristic Algorithms for the Many-to-one IRP with Dynamic Velocity
Authors: Ramadhan F , Imran A
Published: May 2020

Inventory Routing Problem (IRP) is a combination of inventory management and transportation optimization problems that involve route selection, number of product pickups, and customer demands. In the many-to-one IRP model, the vehicle is sent from the depot and goes to pick up products from several suppliers to the assembly plant. Vehicle loads on this model will increase every time a product is taken from the supplier. It can decrease vehicle speed in the next travel process (dynamic velocity). There are still a few papers that discuss many-toone IRP models with dynamic velocity. Therefore, this study aims to develop a new model called the many-to-one IRP model with dynamic velocity. A modified threshold accepting, variable neighborhood search, and record-to-record travel algorithm with the first improvement local search strategy is used to solve the IRP model. Small datasets many-to-one IRP from previous researches and experimental tests are used to test the algorithms. The results showed that the best-proposed algorithm is competitive when compared to the best-known solution in the previous studies (the average deviation is only 1.86%).
Rainfall Prediction Based on Himawari-8 IR Enhanced Image Using Backpropagation
Authors: Novitasari D C R , Supatmanto B D , Rozi M F , Hermansah  , Farida Y , Setyowati Rr D N , Ilham  , Junaidi R , Arifin A Z , Fatoni A R
Published: May 2020

The wider sea area causes greater evaporation of water in Indonesia. In addition, these conditions have an impact on the season that Indonesia has. Indonesia’s high rainfall disrupts human activities. As a result, it is very important to detect cumulonimbus clouds using satellite imagery. The satellite image used is intended to be taken two values of the characteristics possessed. Characteristics taken are average cover and average cloud temperature. Previous studies predicting rain were only done using observational data taken at the height of 10 meters. This research predicts using satellite imagery that represents the cloud peak temperature value. Furthermore, the classification of data is done using backpropagation. The results of the classification process using backpropagation obtained the best results on the distribution of 80% training data and 20% testing data, with the activation function logging in the hidden layer and that the output layer. The results obtained indicate the accuration rate of 88,283%.
Parijoto Fruits Classification using K-Nearest Neighbor Based on Gray Level Co-Occurrence Matrix Texture Extraction
Authors: Mulyono I U W , Lukita T C , Sari C A , Setiadi D R I M , Rachmawanto E H , Susanto A , Putra M D M , Santoso D A
Published: May 2020

Parijoto fruit is a typical fruit that grows around Mount Muria, Kudus Regency and Mount Merapi in Yogyakarta, Indonesia. This fruit has many health benefits, especially for pregnant women. This fruit production is not much because of its limited growth around Mount Muria. So parijoto fruit is made into powder drink products and syrup, so that it can be consumed in a longer period of time and not only during the harvest. To get a good processed product requires good quality ingredients. Parijoto fruit needs to be sorted and classified. Current technology allows classification to be done by digital image processing. The Gray Level Cooccurrence Matrix (GLCM) method is proposed to extract the texture features from the parijoto fruit and then classify them using the K-Nearest Neighbor (KNN) method. GLCM can describe a spatial linear relationship of the frequency at which gray values are determined by other gray values in one area of investigation. It can simply use the statistical approach of appearance or histogram of the image matrix. In this way, information will be easily relative position of neighboring pixels that are suitable for the classification process using KNN. KKN was chosen because this method was proven to be used for relatively few datasets, but a normalization process was needed to increase accuracy. Based on the results of the implementation of the GLCM and KNN methods for parijoto fruit classification the classification accuracy was 80%.
Day Care Recommendation System in Surabaya Based on Temporal Sentiment Analysis
Authors: Fathoni K , Prasetyaningrum I , Pratama A , Hariyati C
Published: May 2020

Daycare is a place to nurture and educate children outside the home which is expected to temporarily replace the roleof parents in working hours. The existence of daycare requires an Information System application that helps parents to choose the daycare they need. The choice of daycare also requires input from users about how they assess the daycare so that parents have no doubts. From these problems, it requires an application that can analyze comments, inputs and testimonials from users to provide appropriate daycare recommendations. This study aims to build a daycare information system that can provide recommendations to prospective customers through analysis of user comments in online media using the Sentiment Analysis method. Sentiment Analysis is the process of understanding, extracting and processing textual data automatically to get sentiment information contained in an opinion sentence that uses the Text Mining method. Data sources that will be processed in the classification process are data on opinions or comments on online news. The core process is the classification process to determine the highest probability of each category. The result shows that the system can rank the 10 best daycare in Surabaya based on temporal sentiment analysis.
The silica-filled natural rubber in presence of epoxidized natural rubbers: curing, swelling and tensile properties
Authors: Surya I , Ismail H
Published: May 2020

The two types of epoxidized natural rubbers (ENR-25 and ENR-50), having 25 and 50 moles of epoxidation, were used to study the influences of their incorporations on optimum curing time, swelling and tensile properties of silica-filled natural rubber (NR) compounds. The NR vulcanizates were filled by silica filler at a fixed loading at 30.0 phr and the ENRs were incorporated separately into the filled NR compounds with varied concentration i.e 5, 10, 15, 20 and 25 phr. The filled-NR compounds were prepared based on a semi-efficient cure formulation and cured at 150 °C. From the results, it was revealed that both the ENRs acted as curatives and compatibilizers. They increased the optimum curing time and crosslinks level of the silica-filled NR compounds. The higher the ENRs loadings; the higher was the optimum curing time and crosslinks level. It was also revealed that the tensile moduli and tensile strength were raised; the elongations at break were reduced as the ENRs incorporations were raised to 25 phr of concentration. At a similar concentration, the ENR-25 exhibited a less pronounced curative and compatibilization affections than ENR-50.
Plastic waste conversion into fuel by utilizing biomass waste as heating system on pyrolysis process
Authors: Sugiarto B , Kurniawan A , Perdana A
Published: May 2020

Human population is growing continuously. Indonesia, as a developing country, has a significant population growth that is projected to reach more than 300 million people by 2035. Beside of abundance of labor force, a significant increase in population has the potential to cause waste problems due to community activities. Plastic is one type of waste that has a negative impact on the environment because it cannot be decomposed directly. Several methods have been proposed to tackle this problem. One technology that is already proven is plastic waste conversion into liquid fuel by means of pyrolysis process. Pyrolysis is thermal decomposition of organic compound by application of intense heating in a minimum oxygen environment to produce simpler compound, in this case is liquid fuel. On the other hand Indonesia as an agrarian country that has abundant biomass supply which is a potential energy source. Therefore, it can be used to supply heat energy in pyrolysis reactors to convert plastics into liquid fuels. This research is a manifestation of applied sciences, in which the process can be practiced by the general public. Plastic waste in the form of plastic bottle waste is reduced in size to 4-9 cm2 so that the pyrolysis process runs optimally. The plastic waste as reactor feed is varied by 500 gram, 750 gram, 1000 gram, 1250 gram, 1500 gram, 2000 gram. Each amount of plastic is put into the pyrolysis reactor for 3-5 hours, and got heated by biomass combustion with average temperature of 412 °C. In the pyrolysis reactor, gaseous phase product of plastic decomposition then flow through a cooler where it changes into liquid phase. The volume of liquid product of pyrolysis process is then measured to calculate the yield of each process variable: 142 ml, 156 ml, 165 ml, 216 ml, 236 ml, and 258 ml. Optimum results are shown in the 500 gram pyrolysis feed process with a yield of 28,4%. The average yield of the pyrolysis process is 18.6%. Therefore, this work has applied waste to energy paradigm, by converting a waste in the form of plastics into a product that has economic value and can be utilized as an energy source for community.
Study of mechanical properties of composite strengthened mango seed powder (mangifera indica cultivar manalagi), brass, and magnesium oxide for brake pads material
Authors: Pramono C , Salahudin X , Taufik I , Bagaskara A , Irawan D M
Published: May 2020

The problem of brake pads are too hard cause a short-lived drum or discs. Whereas, if they are too soft, the brake pads life will be short. This study aims to analyze the specific wear and hardness properties of the composite with mango seed powder, brass powder, and magnesium oxide reinforced with epoxy resin matrix. The variable of this study used the mass fraction of mango seed powder: brass powder: magnesium oxide. The wear test used the ogoshi method, while the hardness test used the vickers hardness test tool concerning the ASTM E384- 17 standard. The results showed that the specific wear and composite hardness values were close to the mechanical properties of KEV-2700 brake pads, namely composites with a composition of 35% mango seed powder, 35% brass powder, 20% magnesium oxide, and 10% epoxy resin at 3.29 × 10−7 mm2/kg, and 214.38 N/mm2. This composition recomended for manufacture brake pads.
Numerical investigation of the hardness of tire rubber material by indentation method
Authors: Setiyana B , Prabowo C , Jamari J , Ismail R , Sugiyanto S , Saputra E
Published: May 2020

Hardness is an important mechanical property to express the rubber material’s properties. The hardness is closely related to elastic modulus value that is usually obtained by indentation technique. In elastic modulus investigation, the indentation method is more practical to be applied than tensile test method. Analytically, due to the hyper-elastic and non-linear nature of rubber material, theoretical discussion about the rubber properties is difficult to be performed therefore a numerical method is applied. This paper discusses the investigation of the elastic modulus of tire rubber specimens by indentation method numerically and compares to the tensile test method experimentally. Analysis was carried out by Finite Element Analysis (FEA) and two types of vulcanized rubber were analysed. The rubber analysed are often called as a hard compound (vulcanized 1) and soft compound (vulcanized 2) that is commonly used for tires. Indentation modelling was carried out to follow ASTM D 1415-88. Mooney-Rivlin model for Strain Energy Function (SEF) was applied to describe the material’s behaviour. The analysis shows that the results of the indentation method are close to the results of the tensile test method.
Micro pave setting for the triple moon goddess jewelry set designs
Authors: Atamtajani A S M , Yudiarti D
Published: May 2020

Generally, jewelry is made from gold and silver with the addition of the jewel itself. Frack & Co usually use a diamond with level F color and clarity of DVS (Very Slight Inclusions). Thus jewelry has purposes as beautify of its user, it has another purpose which is as the prestige of the lifestyle of the user. In this research analyzed trends, color, and price. Based on the market-targeted analysis, jewelry design is produced based on two classes of price, the middle-class user (approx. 15-45 million) and the high-class user (45-85 million). The Triple Moon Goddess jewelry set design is using white gold and rose gold 18K and diamond with 0.0010C-0.042C by using the technique of Micro Pave setting and round ash facets, so the diamond looks brighter and bigger. The concept design is based on 3 moon symbols with a crescent shape, full moon, and crescent moon sequence. It is referring to the symbol of life birth, maturity, and wisdom. The jewelry set consists of a woman ring, a bracelet, and a pair of earrings. The production process uses the wax tree and gold casting process.
Fiber content of analog rice production from composite flour: cassava, avocado seeds, and tofu waste
Authors: Putri E C J , Sumardiono S
Published: May 2020

Rice is the main food for the people of Indonesia. Many nutrients are obtained from rice which is used as an energy requirement for the human body, such as fiber. fiber is a nutrient for the body that functions to shorten the transit time of food in the intestine, thereby increasing the stool mass in order to facilitate the disposal process for humans. Fiber can be found in rice on the market, but the fiber content in market rice is low. Therefore, the aim of this research is to create an analog rice formulation made from mocaf flour, avocado seed flour, and tofu waste flour using hot extrusion method which has a high fiber content in order to combine analog rice as a national staple food as a substitute for rice which is safe for consumption every day by the community. From the research that has been done, it was found analog rice formulation which has a fiber content of 26.98%.
Corrosion inhibitor behavior in typical car radiators
Authors: Saifudin  , Munahar S , Setiyo M
Published: May 2020

A minor breakdown of the cooling system will cause engine overheating. One of the factors causing the engine overheating is the crust on radiator of cooling system. Based on the problem, therefore, corrosion on the cooling system, especially radiator, should be controlled. There are some methods in controlling the corrosion; one of them is the inhibitor treatment. The research aims to know the corrosion mechanism, the corrosion type, and the kind of inhibitor that produces the lowest corrosion rate. The tool used to measure the chemical composition of the radiator is spectrometer, while microscope optic is used to know the radiator corrosion type. The corrosion rate testing is used three electrode cells according to tafel extrapolation method. The results of the test of the nitric acid inhibitor treatment with the addition of various methods showed that the most optimal result is on the addition of nitric acid inhibitor by 5%. It is proven by the decrease of corrosion rate from 0.002207 mmpy to 0.0171 mmpy.
An overview of structural designs and building materials in shell structure for the mosque and the future development
Authors: Nugrahini F C
Published: May 2020

The developments of technology in realizing contemporary designs become a hot issue for the development of the mosque’s appearance and shape. The development of the shell building in the mosque which is quite attractive to the public was the construction of the Cologne Central Mosque in Germany in 2017. For the point of view that shape of the building is a new era in the use of shell structures in the mosque. The shell structure commonly used as a dome of the mosque that is used as a symbol of the mosque buildings in general use and continues to this day which began from the era of the caliphate. This paper will present a review of the structural designs and building materials on the shell structure of the mosque which has been developing from time to time. And can be used as a possible new reference in the future developments of mosque architecture.
Machinery parameter optimization of CNC milling programming towards process time
Authors: Widodo E M , Purnomo T A , Ariyanto N
Published: May 2020

The Tooling Department is a department engaged in manufacturing die, namely the manufacture of printing equipment to make components/pressed part made according to the desired design and processed on a pressing machine, die ordered from the customer, namely sole agent brand (ATPM). The manufacturing process has been running well so far, but to improve service and to reduce manufacturing die costs, it is necessary to improve time efficiency by optimizing machining parameters. The purpose of this study is to determine the machining parameters that produce optimal processing time in CNC milling programming. This study uses the Taguchi Method with the Orthogonal Array L9 pattern. Factors to be examined include cutting speed, feed rate, depth of cut and machining tolerance using a cutter ball nose Ø32 mm and Ø30 mm. Parameters that produce optimal machining process time in CNC milling programming for cutter ball nose Ø32 mm are at optimum cutting speed = 100480 mm/min, optimal feed rate conditions = 1200 mm/min, optimal depth of cut = 1.5 mm, and conditions machining tolerance = 0.09 mm. The machining process time produced under these conditions is 265.73 minutes. Whereas for cutter ball nose Ø30 mm is at optimum cutting speed = 103620 mm/min, optimal feed rate condition = 1280 mm/min, optimal depth of cut = 1.5 mm, and machining tolerance = 0.09 mm. The machining process time produced under these conditions is 265.51 minutes.
Reverse innovative design and manufacturing strategy for optimizing production time of customized orthotic insoles with CNC milling
Authors: Anggoro P W , Anhony A A , Tauviqirrahman M , Jamari J , Bayuseno A P
Published: May 2020

Reverse innovative design (RID) of insole shoe orthotics for patients with diabetes and the manufacturing strategy in optimizing the production time of the insole were examined in the present work. The plantar surface of the feet from two female patients was scanned using a 3D scanner yielding a 3D mesh foot for each patient resulting in an STL file format. The geometric shapes of the 3D models of the feet were fitted very well using curve based surface modeling (CBS-modeling) for insole orthotics design and integrated with CAM (computer-aided manufacturing). Optimization of the manufacturing time was simulated in CNC milling with the Taguchi approach. The manufacture of the optimal insole design was achieved at the optimum machining parameters such as toolpath strategy (A) with raster machining, spindle speed (B) of 15000 rpm, feed rate (C) of 900 mm/minutes, and step over (D) about 0.30 mm. The optimal design of the orthotic insole has the geometric tolerance (D) of 0.75 mm for patient 1 and 1.50 mm for patient 2. The optimal machining time for the insole of patient 1 is 3.79 and 4.02 hours for patient 2. The optimal machining time for the insole of patient 1 is 227.48 minutes and 241.65 minutes for patient 2. These valuable data are needed for the real manufacturing process of insole material in CNC milling.
Comparison of radiograph image information on lumbar vertebrae examination using the application of the anode heel effect theory
Authors: Adi E P , Iqbal M
Published: May 2020

Heel effect is a consequence of the focus line principle that the intensity of X ray radiation on the cathode side will be greater than the anode side. Related to the phenomenon of X ray emission, namely heel effect, the lumbar vertebrae object which is anatomically from cranial shrinks and enlarges until it reaches its maximum in the sacrum bone then shrinks to the apex of the coxygeus bone, on this examination it is necessary to consider the application of the anode heel effect theory. This study aims to determine whether or not there are differences in radiographic image information on the examination of lumbar vertebrae by applying and not applying the anode heel effect theory. Retrieving radiograph data is carried out with 5 research objects in the form of probands. The results of the radiograph are then measured using a densitometer to obtain a density value. To support the research data, questionnaires were conducted on 5 radiology specialists. Examination of the lumbar vertebra with the application of the anode heel effect theory produces different information on density, contrast, detail, and sharpness by not applying the anode heel effect theory.
Apology response strategies used by Indonesian EFL fresh graduates: on gender and academic achievement
Authors: Waluyo S , Sutiyatno S
Published: May 2020

The challenge for language teachers is to make the students able to communicate in the target language. One of the language aspects that many EFL learners, including university students, still struggle to produce appropriate responses is pragmatic competence. This study attempts to investigate whether gender and academic achievement were significant to predict Apology Response strategies used by EFL fresh graduates. Thirty fresh graduates, 18 females and 12 males, from an English Department of a state university in Indonesia were selected as the participants. Their academic achievement was simply derived from their GPAs which then were grouped into three levels of low, middle, high categories. The instrument used was Discourse Completion Task (DCT) which was used as scenario. The participants were asked to answer the DCT orally through interview. The DCT results were then classified into Acceptance (AC), Acknowledgement (AK), Evasion (EV), and Rejection (RJ). The three variables were then analysed using descriptive qualitative approach. The results were quite elaborate. Most of the participants tend to use Evasion strategy when responding to apologies; however, the number of males who apply Acceptance was also significant. Similarly, for the academic achievement, participants with high GPA do not necessarily employ Acceptance and vice versa. To conclude, neither gender nor academic achievement can be considered as the significant predicators of Apology Response strategies used by the participants. This study is expected to be useful for teachers or lecturers to consider Pragmatics studies in their teaching and learning activities.
The effect of problem-based learning on high school students’ problem-solving skill and comprehension of biological concept based on their academic performance
Authors: Taharu F I , Safilu  , Aba L
Published: May 2020

This research aims to find out whether there are : (1) the significant difference of problem-solving skill and comprehension of biological concept between students who are taught with Problem-Based Learning (PBL) strategy and students who are given direct teaching process; (2) the significant difference of problem-solving skill and comprehension of biological concept among students who are academically high, academically medium, and academically low; The population of the study was 183 students, the samples taken were 60 students. The study is a quasi experimental study. Descriptive analysis is used to describe and elaborate the data, whereas inferential analysis is used to find out the difference of Problem-Based Learning’s effect on the students’ problem-solving skill and the students’ comprehension of biological concept based on their academic performance. The result of the study shows that: (1) there is significant difference of problem-solving skill and comprehension of biological concept between those who are taught via PBL and those who are given direct teaching; (2) there is significant difference of problem-solving skill and comprehension of biological concept among the students who have different academic performance.
Enhanced electrical conductivity of counter electrode using hybrid of reduced graphene oxide assisted with customised triple-tail surfactant with multiwalled carbon nanotubes
Authors: Fatiatun  , Firdaus  , Jumini S , Suriani A B , Marwoto P , Wibowo K M , Astuti B
Published: May 2020

The fluorine-doped tin oxide (FTO) was utilized as a substrate in counter electrode (CE) fabrication using spray coating method. Hybrid of reduced graphene oxide (rGO) assisted by custom-made triple-tail sodium 1,4-bis(neopentyloxy)-3-(neopentyloxycarbonyl)-1, 4-dioxobutane-2-silphonate (TC14) and commercially available single-tail sodium dodecyl sulphate (SDS) surfactants with multiwalled carbon nanotubes (CNTs) were developed as CE in dye sensitized solar cells (DSSCs) application. The rGO was fabricated by using reduction process from GO solution synthesized by electrochemical exfoliation method. During the reduction process, the reducing agent of hydrazine hydrate was utilized to reduce the oxygen functional group in synthesized GO solution. Hybrid of TC14-rGO and MWCNTs presented better structural and electrical properties than pure TC14-rGO. Higher electrical properties of TC14-rGO/MWCNTs hybrid was believed makes faster electron transport for the dye regeneration in DSCCs measurement. Therefore, the TC14-rGO/MWCNTs hybrid CE thin film showed suitable to be applied and developed in DSSCs application.
Utilizing a web-based technology in blended EFL academic writing classes for university students
Authors: Turmudi D
Published: May 2020

This paper discusses a web-based instruction mixed with off-line learning in a blended EFL academic writing classes for undergraduate students. The concepts are constructed by reviewing selected and related articles based on the current trends of blended instructions with the aid of technology in education. The main ideas taken into account is how to make EFL academic writing practicality, and convenience, yet respecting norms and responsibilities of education principles. It is practical since it is flexible and can be done anywhere and anytime, yet within the consensus. Thus, the concept covers the conceptual framework of blended EFL academic learning mixed with face-to-face and web-based model as a unit of Blended EFL Academic Writing Classes. It is a theoretical description and procedural flow of face to face and web-based. This is hoped to assist any higher education educators in treating the students and contribute to the body knowledge of online learning in the era of information and communication technology (ICT) or currently known as virtual technology era.
Darrieus type vertical axis wind turbine (VAWT) design
Authors: Wasiati S W , Augusta F A , Purwanto V R P , Wulandari P , Syahrirar A
Published: May 2020

The potential of wind energy in Indonesia is generally relatively less compared to other countries in the subtropical region. With the Darrieus VAWT Type Vertical Axis Wind Turbine, the turbine does not have to be directed to the wind to be effective. Mill with vertical axis, generator and gearbox can be placed near the ground, so the tower does not need to support it and is more accessible for maintenance purposes. Gearbox or transmission is one of the main components of the motor which is referred to as a power transfer system, the transmission functions to move and change the power of the rotating motor. To get a large turbine torque, a gearbox design (large size on the turbine, and a smaller size on the rotor generator) is needed. The number of blades used will also affect the effectiveness of the turbine in capturing the wind. With the number of 3 blades, get torque above 40 rpm, at wind speeds of 4.5 to 5 m/s.
Vertical axis wind turbine analysis using MATLAB
Authors: Augusta F A , Afif A Al , Wulandari P , Syahriar A
Published: May 2020

Wind Turbines have become one of the feasible power plants to replaced fossil fuels. Because this plant is affordable cost and did not produce pollutants as an output. Vertical Axis Wind Turbine can be placed at points with high wind intensity such as; toll roads, ships, railroads, airports. The energy produced can be distributed for the civilian house light, the street lights, the fishing boats light, others. The hope is that wind turbines can generate 100 watts of power, so that charging time can be at least 6 hours. But, the average velocity data in the field is worth under 2.85 m/s (minimum wind speed to get 100 watt). Resulting in a turbine charging time more than 6 hours. In this case, The Turbine needed more than one accu as a place to store the energy even the accu take more than 6 hours to be charged.
Designing parallel computing using raspberry pi clusters for IoT servers on apache Hadoop
Authors: Nugroho S , Widiyanto A
Published: May 2020

The community has widely used the IoT tool because it makes it easy for users in various sectors. The implementation of IoT does not only require connectivity and devices but also requires a server. Servers that are accessed by many devices will have more and more computing processes on the server. The computing process on the server requires a high-performance but small-sized server device that is easy to connect with other devices. Raspberry Pi, known as an IoT server, is a computer with a small size, cheap, and very energy efficient. The parallel machine was built based on Raspberry Pi using parallel computing technology to have high performance. Nowadays, one of the parallel computing tools is Apache Hadoop. This research using clusters method with four pieces of Raspberry Pi with parallel computing technology using Apache Hadoop tools. Testing is done using Siege tools. The number of requests that used to test web server performance in this research was 10, 50, 100, and 150. The most optimal results are on requests by 50 with an increase of about 260% from a single node to cluster in the measurement of transactions, transaction rates, and throughput. Testing with 150 requests can only increase by 50% to 60%.
The relation of compressive strength and tensile strength of bamboo fibber for soil stabilization
Authors: Siswanto J , Latifah K , Supriyadi B , Rochim A , Alzami F
Published: May 2020

Bamboo can be used in construction planning because based on its properties, the mechanical strength of bamboo has high tensile strength and high compressive strength so that it can be used for soil reinforcement. Bamboo which has good quality will also have good mechanical properties as well because bamboo which has good compressive strength, laboratory results also show that bamboo has good tensile strength as well. Thus, there is a correlation between compressive strength and tensile strength in bamboo which is an environmentally friendly material as a soil strengthening material. The data in this study were using bamboo Apus and Javanese bamboo. Because bamboo is often used in industry and is easily available in Semarang. This study uses a simple linear method (Ordinary Least Squares). Simple linear regression model is one of the regression models that are often used in regression analysis. The dataset divided into 2 part, namely by comparing 60% of training data and 40% of testing data. The result from the data testing showing linier regression (least squares) estimate becomes very sensitive to random errors in the observed target, producing a large variance and the following results are obtained Correlation Coefficient 0.99607873, Mean Squared Error 12. 58799, Variance Score 125.60. The results show that the correlation coefficient is 0.99607873, it’s mean that the linear model is close to number 1 meaning that this model is a good model because the correlation coefficient value is close to 1 so there is a positive relationship between or positive correlation between the compressive and tensile tests.
Prototype design of automatic plant watering equipment with soil moisture detection system based on arduino uno microcontroller: case study of chili plant
Authors: Rosadi A , Fauzan A , Winarno
Published: May 2020

Indonesia is an agrarian country, and most of the population’s livelihood is in the agricultural sector. One of the results of agricultural commodities is chilli. The chili is a vegetable commodity that cannot be separated from the daily needs of the community. In the process of planting chili plants, water requirements greatly affect the growth of chili plants. However, along it was with the occurrence of delays in watering, especially in the dry or hot season. Watering chili plants based on soil moisture was one way to treat chili plants properly. Using the Arduino Uno microcontroller was as the main controller for the automatic chilli watering program. The program received input from the sensor soil moisture. The soil moistures were a sensor that worked to determine soil moisture, so when the soil was under certain humidity conditions it can water the chilli plants automatically.
Design and consideration of off-board lithium-ion battery charger for electric vehicle
Authors: Rusli M R , Mukhlisin A , Raharjo J , Yuniarto M N , Wikarta A , Haerudin H
Published: May 2020

Recently the development and population of electric vehicles (EV) has increased significantly in line with the issue of reducing air pollution and fossil fuel dependence. EV uses batteries as the main energy source and Lithium-ion (Li-ion) batteries are more widely used by the consideration of having high energy, life cycle, and power density. As same as the ITS electric scooter which uses a Li-ion type battery pack with an operating voltage of 100 V 3.2 kWH. A battery charger has a crucial role in charging a battery pack. In this article, design, consideration, and implementation of an off-board Li-ion battery charger has been described. As a result of the proposed charger experimental test, it was capable for portable charger and producing power output up to 2.5 kW, power quality was improved through the power factor correction (PFC) which had the value above 0.75, charger efficiency was above 87%, programmable setting, temperature cut-off, and could be integrated with a battery management system (BMS) through CAN communication. The charger is expected to be reliably used for EV especially ITS electric scooters by using those features.
MERA (motorcycle emergency ride assistance): plug-in for accident detection and notification
Authors: Balafif S , Purnomo D , Haryanti T
Published: May 2020

The condition to trigger the Automatic crash detection for motorcycles is more complex, since the collisions in real life are usually different than those in the lab. so in order to boost the accuracy and affectivity, the researchers must reduce inconsequential deployments, the occupant weight, and riding condition, as well as re-calculate the speed to crash conditions. In this paper was present a continuously evaluates and innovate for crash detection with support automated notification system. The accident detection, communicates the accelerometer, vibration, speed and lean values to the determine accident status and level. In this concept, three different variable measurements are attached to head of the motorist and motorcycle body, Crash dummy tests are done for trial particular systems in helmet by throwing the helmet with different altitudes to simulate the effect of crash to the motorist, and for capture the location of accident, real data is collected by driving the motorcycle. The implemented prototype system showed promising results for automatic crash detection, and the system also showed its success for deliver real-time notifications when an accident was happening.
Study of rare earth elements and heavy metals in tin tailing from mining activities on North Bangka Island
Authors: Andini D E , Sari F I P
Published: May 2020

Rare earth elements (REE) are important minerals, especially in the defense sector and the modern high biotechnology production materials industry. REE and heavy metals are found in minerals associated with lead deposits. This research was conducted to determine the potential of REE and heavy metals in tailing or waste minerals which are the residual results of mining in tin mining at sea and on land. Sampling locations include primary tin or alluvial tin mines in six locations that represent locations at sea and on land using the analysis of neutron activation analysis (NAA) and X-Ray Fluorescence (XRF) obtained the potential content of REE and heavy metals deposited in primary mines on land. In tailings samples in active mining carried out on land and at sea there are rare earths and heavy metal contents, although with relatively small amounts.