bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis of operation and maintenance cost flood handling system of Badung River
Authors: Mudhina M , Parwita I G L , Yasada G
Published: March 2020

All of Badung River with a wide width of 10-40 meters is a typical urban river that has very important meaning to the flood handling system in the Denpasar City area. The results showed that the buildings on the Badung River included 2 trash racks, 1 rubber dam, 2 movable weirs and a 42 km long river wall with an average height of 3-5 m. The flood handling system has been carried out with control of the existing discharge through motion weirs and rubber weirs. While reducing waste that can cause flooding is done by building garbage filters. From the results of the analysis the operating and maintenance costs indicate the cost of routine inspection of 57,772,800 IDR/year, routine search fees of 27,936,000 IDR/year, additional eviction fees of 100,550,400 IDR/year, monitoring and evaluation costs 27,360,000 IDR/year, flood material costs 7,240,000 IDR/year, routine operations and maintenance of 3,306,067,750 IDR/years, the need for periodic fees every 5 years is 2,200,000,000 IDR and the cost of dredging sediments and river stone repairs amounting to 1,113,566,000 IDR every five years.
Redesigning the foundation of Bangli solar power plant on a former landfill
Authors: Indrayanti A A P , Wiraga I W , Jaya I M , Mas Pertiwi I G A I
Published: March 2020

Bangli solar power plant has 5004 solar modules and uses concrete foundations to support those modules. Due to the location of this power plant was a former landfill, after 5 years in operation, 121 foundations have dropped to lower level. The soil under foundation is not enough to support modules sufficiently. In this paper, a new design has been proposed to correct this problem. The first step is to test the carrying capacity of soil through Sondir boring. Using Standard Penetration Test (SPT) obtained that the layer of hard soil is located at a depth of -10m from the original soil surface with type of soil layer above the elevation of hard soil in the form of silt soil. Using a palm foundation, carrying capacity of a foundation with a width of less than 1.2 meters and a depth of foundation of 1 meter. This makes the average carrying capacity is only 0.39 - 1.20 kg/square cm or the value is too small for foundation of solar power plants. The proposed foundation is a 50 x 50 cm palm foundation that is laid on a geotextile bed. The area of the geotextile depends on the area of decreased foundation.
Planning area of resist natural disaster in Bentenan Village South Eastern Minahasa
Authors: Makalew F P , Supit S W M , Kondoj N E , Mantiri H G
Published: March 2020

Disaster management is crucial to protect the area in order to overcome the impact from such disaster. This paper aims to plan safety zone area and evacuation route for village settlement to be natural disaster resistance. Moreover, an evacuation building is planned with a safe structure as a temporary place for the community. The study area is Bentenan village in North Sulawesi. This area has a high risk of natural disaster including earthquake and tsunami. The methodology is field study with data collected using a drone to get data contour area and analyse using computer program AutoCAD for measurement. The standard for safe area and previous research is used as a comparison for the zoning area. The result shows that for maximum30 meter high of a tsunami wave, all area has a great impact on damage due to the area of settlement is under 30-meter-high above the sea level. For evacuation route, more alternative safe evacuation area should be provided with a location on the highest area. Available main streets are easily accessed while route on the green area should be made. Building for evacuation should have a good quality of material and structure and easy access for the community.
The effectiveness of horizontal water filtering system on deep rainwater harvesting wells
Authors: Sudiajeng L , Wiraga I W , Parwita I G L M , Budiadi I M
Published: March 2020

The main requirement in recharging aquifers is the quality of refill water must meet the groundwater quality standards. Therefore, the role of the filtration system is important. The horizontal water filtering system has designed to lengthen the filtering process. First step: Rainwater falls that contaminated with various substances flows into the 20 cm thick and 1 m depth of gravels; Second Step: Rainwater continued flowing into the horizontal pipe, 4” of diameter, 20 cm length, with the fibre palm tree inside. The filtered water comes out and collected in a reservoir, flows into a recharge wells with 4” diameter and 32 m depth, and fills the aquifer after going through the soil layer. Laboratory tests shows that the horizontal water filtering system is effective to reduce the content of substances, except the TDS for filtering system in Plaga Village. It decreased from 135.00 uS/cm to 81.90 uS/cm (26.55 percentage) in Tegallalang village, but it increased from 95.00 uS/cm to 154.00 uS/cm (62.21 percentage) in Plaga village, although it still meets to the groundwater quality standard. The increasing of TDS might be cause by gravels or palm tree fibres that not thoroughly cleaned and still contained TDS.
The effect of river flow velocity distribution on indications of the occurrence of degradation of the Tambong River basin
Authors: Erwanto Z , Sugata A N I
Published: March 2020

Floods that have high flow velocity can be indicated that there is degradation in the riverbed. If the deterioration of the riverbed is allowed to continue, it can cause damage to the existing building infrastructure around the river. Tambong River, located in the Kabat District of Banyuwangi, has experienced river overflowing. Process of measuring flow velocity uses the current meter. To determine the shape and contour of the Tambong River flow velocity distribution using the Surfer Software. In the Tambong River basin, the middle river of the downstream has the highest river flow velocity distribution of 0.92 m/sec, with a discharge of 1.75 m3/sec. It was indicated that the Tambong River Basin in the middle of the downstream would experience river bed degradation by showing a Reynold of 426, 997.33 and a Froude value of 0.55 so that it includes turbulent flow types and flow types subcritical. Average flow velocity distribution in the middle of the Tambong River basin is 0.901 m/sec and was indicated to have degraded as thick as 2.10 m/year. It can be concluded that the middle part of the Tambong river is a flood-prone zone due to the considerable velocity of the river flow.
Comparison of Ziegler-Nichols and Cohen Coon tuning method for magnetic levitation control system
Authors: Isdaryani F , Feriyonika F , Ferdiansyah R
Published: March 2020

Magnetic levitation is an example of a nonlinear system that is naturally unstable. In the control system field, it can be also used to check the effectiveness of control methods. Unlike other researches overcoming by analytical method, this research investigates the solution of the nonlinearity of the magnetic field by placing two effect hall sensors on the top and bottom of magnetic coils. After decreasing the effect of nonlinearity, two PID control tuning methods, Ziegler Nichols (ZN) and Cohen Coon (CC), are compared to obtain an appropriate control structure and its initial parameters. The experimental result shows that the best control structure of ZN method is PID whereas its initial parameters, Kp, Ti, and Td, are 15.33, 0.036 and 0.009, respectively. The rise-time and settling time of the response are 0.54s and 0.59s. The appropriate control structure is PI control whereas Kp and Ti are 30.05 and 0.012 from CC method. The rise-time and settling time resulted are 0.8s and 0.67s. The ZN method with PID control structure has a better response with smaller rise-time and settling time than PI control from CC Method. This research is benefit for solving a problem dealing with magnetic levitation control.
Experimental analysis on solar powered mobile robot as the prototype for environmentally friendly automated transportation
Authors: Dewi T , Risma P , Oktarina Y , Taqwa A , Rusdianasari  , Renaldi H
Published: March 2020

An unmanned vehicle can be deployed in a dull area such as a repetitive task of a transport vehicle in a factory setting which can be considered as automated transportation. The current problem faced by the transportation sectors are the reduction of fossil fuel availability, therefore, solar-powered automated transport vehicle is a great alternative. This paper discussed the experimental analysis of solar-powered mobile robot as the prototype for environmentally friendly automated transportation. The solar cell output is used to charge the capacitor banks functioning as the substitute for a battery system. The robot moves from one station to another imitating the stations in a factory scenario. The solar-powered robot is equipped with a voltage sensor to ensure efficient charging time. The charging time was conducted in 5 days to show the charging fluctuation affected by external factors such as weather condition. The highest average charging in a day is 4.96 V during 100.687 Lux of irradiance received by the solar cell. The highest power required during the loaded task is 0.0121 W, and during unloaded is 0.0106 W. The experiment results show that the proposed method is effective for environmentally friendly automated transportation.
Pedestrian lane and obstacle detection for blind people
Authors: Supriyadi T , Setiadi B , Nugroho H
Published: March 2020

Pedestrian lane and obstacle detection have been a big problem for a blind person. The person has to use special tool or assistant to do daily activities. This work has utilized camera function, connected with data processing (mini PC) to process information captured by a camera. At first, RGB image, which was captured camera, was converted into XYZ colour system. This colour system was very useful to highlight pedestrian lane to reduce other objects. Then, colour filter was implemented to remove unnecessary objects, followed by close morphology to expose pedestrian lane. The result is white region which represent pedestrian lane. Major axis was then calculated using moments and its angle (calculated counter clockwise with reference to x-axis) was sent to the user to notify him/her which direction he/she can go. In the process of obstacle detection, some samples of RGB images has been used to train a neural network. The model was then used as obstacle detector. RGB images captured by camera were then used as test data. The result > 0.7 was considered as obstacle. The experiment shows that under illumination of <15000 lux, the method can achieve 89.7 percentage accuracy on pedestrian lane detection and 100 percentage accuracy on obstacle detection.
Design a three-phase step-down power supply based on ANSI/IEEE standard
Authors: Suhantono D , Sajayasa I M , Sukarma I N
Published: March 2020

An alternating current three-phase step-down power supply design is a system development process that creates an existing three-phase system whereby the primary side of the Y relationship and the secondary side of the Y relationship. The problems in the design of three-phase step-down power supply circuit are the existence of harmonics, losses and unbalance voltage. The power supply test is carried out using no-load and linear load resistance with the value of resistances in range of hundreds ohm. The circuit is tested for resistance number one, resistance number two, resistance number three and resistance number four transformers to obtain a power supply design that meet American National Standards Institute or Institute of Electrical and Electronic Engineering standards. The test results of four transformers in the form of three-phase step-down found that resistance number one and resistance number two type transformers have the lowest copper loss percentage, core loss, voltage THD and low unbalance voltage, so that these power supply can be made according to ANSI/IEEE provisions.
Insulation resistance and breakdown voltage analysis for insulator cover type YSL-70AP
Authors: Jondra I W , Widharma I G S , Sunaya I N
Published: March 2020

Electrical energy has become a primary necessity, for every human around the world in globalization era. Electrical energy very important in every human activity to supporting the economy. Currently requires reliable of electrical distribution energy. Reliability of electrical energy supply is measured by the low value of SAIDI and SAIFI. Most of the PLN APJ has not able to fulfil SAIDI and SAIFI targeted by SPLN. There are 54 percent medium voltage disorder due to temporary interference. These disorders are caused by trees, animals and birds. insulator cover applied to reduce temporary interference. The problem is no research explaining the isolation quality and voltage breakdown capacity. This research conducted by quantitative testing and analysis. It was finding that the insulator cover type YSL-70-AP is reliable to reduce temporary disorder and environmentally with consideration: (a) The insulation value is 278.80 Mega Ohm, so that the electrical current of phase-ground fault is only 41.61 micro Ampere, just 0.36 percent of maximum limitation of PLN standard; (b) The voltage breakdown capacity is 49.63 Volt, more than 207 percent of minimum limitation of PLN standard. The voltage breakdown capacity can be increase by wings extension.
The implementation of Fast Hilbert Transform with low pass filter for reconstructing breathing sound signals in LabView
Authors: Purnama I B I , Sumertayasa I M
Published: March 2020

Many studies have stated that the respiration rate is one of the vital signs in individual health. It can be used to identify serious illness. Detecting either the chest movement or the exhausted gases properties using various sensors are the common methods to monitor respiration rate. Apart from both, breathing sound seems also effective for such purpose without requiring any complicated sensing devices. However, attaining respiration rate from the burst-type of breathing sound signals is challenging. Their high variations in frequency, amplitude, and the interval between inhalation and exhalation make the reconstruction of a smoother signal needs extra signals processing effort. This paper proposes a technique to reconstruct breathing sound which is acquired using a built-in headset microphone and implemented using Fast Hilbert Transform with Low Pass Filter in LabView. Through adjusting a proper filter order and cut-off frequency, the result shows that the proposed method is able to derive the representation of breathing sound signals in a smooth curve and convenient form. Compare to the raw ones, this reconstructed signals will make the peak detection easier. It is expected that this sound-based approach will be a cheap and effective solution for further respiration rate monitoring systems.
Power performance of boundary technique on FOSMC based induction motor drives
Authors: Aditya A W , Utomo R M , Hilmansyah  , Purwanto E , Rusli M R , Praharsena B
Published: March 2020

Power analysis of induction motor (IM) consists of active, reactive and apparent power. Those power related to power factor (PF) which indicate the performance of IM. This paper presented the power analysis and power factor of IM using IFOC system (part of vector control). However, IFOC only provides speed regulation but not the robustness under disturbance. In one hand, FOSMC proposed the robustness against disturbance and stability of the systems. In another hand, FOSMC has the disadvantages in chattering phenomenon which increase power consumption. Boundary technique (BT) designed in FOSMC using sat(.) function to reduce the power consumption. As the results, the BT decreases stator current consumption, active, reactive and apparent power. active power has an average decrease of 13.02 percent in the variable of torque load, reactive power has an average decrease of 10.46 percent and apparent power has 12.11 percent. The stator current has an average decrease of 12.53 percent. At no-load conditions, the average decrease in power consumption is 30.05 percent. This value decreases when the torque load increases.
High voltage capacitor charging system in application of multi-stage coil gun
Authors: Winarno B , Putra R G , Yuwono I , Sumantri B , Gunawan A I
Published: March 2020

High voltage capacitor charging system applied for multi-stage coil consisting of a coil arrangement as a launcher and requires much energy to work. However, large currents and the high voltage required are very limited. High voltage capacitor banks are used as an alternative for energy storage. This capacitor bank is supplied by batteries and requires a charging device. The process of charging a high voltage charging capacitor requires a DC-DC Converter device. In this article, to supply energy to the coilgun, a High Voltage Capacitor Bank is used. 10 capacitors are connected in parallel charging the capacitors with a voltage divider system to avoid swelling at the capacitor charge. This device has been successfully implemented in Multistage Coil Gun. The results achieved indicate an increase in voltage capability up to 1.8 kV DC.
Floating oil skimmer design using rotary disc method
Authors: Supriyono S , Nurrohman D T
Published: March 2020

Over the past few years there have been many oil accidents that have occurred in the sea. Oil accidents can occur due to oil spill, drilling processes at sea or due to pipeline leaks. The oil in the sea will float and if not remove will damage the surrounding ecosystem. Therefore, in this paper implements an oil skimmer system which can be used to remove and separate oil from the water. The oil skimmer system is composed of a rotary disc to take oil on the surface of the water and two propellers to move the oil skimmer. The rotary disc and propeller are driven by DC motor which is connected to the motor driver and Arduino Mega as a controller. The oil skimmer is also equipped with a joystick that is used to adjust the rotation speed of the rotary disc and control the movement of the oil skimmer. Based on the results of testing the oil skimmer has been able to take and separate oil on the surface of the water with separation speed of 620.28 ml/min at a speed of 18 rpm.
Monitoring water quality using star topology wireless sensor networks
Authors: Dwisaputra I , Rolastin B , Afriansyah R
Published: March 2020

The main purpose of this paper is how to implement wireless sensor networks (WSNs) using the star topology for water quality. This system using three devices. Two devices are the data transmitters and one device are the data receiver. Each device uses a NRF24L01 wireless module. There are two sensors that are temperature and Power of Hydrogen (pH) for each transmitter device. Each transmitter device can send temperature and pH data directly to the receiver. Receiver collects data from transmitter and sends it using serial communication to personal computer for monitoring. The result in the experiments is the data can be sent properly. The temperature sensor has an average error of 1.26 percent from 10 different data experiments. Data from the pH sensor test results explain that the pH sensor has an average error rate of 1.88 percent. The wireless module NRF24L01 can transmit data up to a distance of 30 meters. WSNs system using star topology has worked well and can be used in aquaculture ponds.
Design of MSF type brine circulation system for steam power plant
Authors: Wuryanti S
Published: March 2020

Multi-Stage Flash Desalination type Brine Circulation (MSF-BC) is one of the desalination technology that utilises thermal heat in water treatment systems, which is used as a pre-treatment by purifying seawater into freshwater. In this design, MSF-BC design criteria are discussed that can meet the water needs of the 3 × 315 MW steam power plant generator with a water requirement of 130 m^3/hour. MSF-BC works with the principle of evaporation of seawater, and then the water vapour is condensed and produces distillate products. The design starts by determining the initial parameters of the design that is seawater data. Then do mass and energy balance calculations, heat transfer, and performance parameters using Performance Ratio (PR). The calculation shows that the temperature difference for each stage is 4.50 degree Celcius with a heat transfer area of 5154.2 square meter and the resulting distillate product is 131.42 tons/hour. The specifications of the pipe used are Copper-Nickel 90-10 with an outer diameter of 25.4 mm, pipe length of 2.22 m, and the number of pipes in the heat recovery stage are 2240 pieces with nine stages while in the heat rejection stage as many as 3060 pieces with three stages and performance ratio is 4.4.
Investigation on application of ultrasonic humidifier for air conditioning system
Authors: T Putra I D G A , Sunu P W , Temaja I W , Sugiartha N , Sugina I M , Suirya I W
Published: March 2020

Ultrasonic humidifier in the recent years becomes more favorable technology on air conditioning system. High frequency surface vibration below water layer created by a piezoelectric transducer to make atomization of water on the surface of piezoelectric transducer. Application of the mist generated for air conditioning system need to investigated their relative humidity and dry temperature of the air that will be conditioned. Testing model and simulation of ultrasonic humidifier was developped to understand influence of mist generated on relative humidity and dry temperature of the air. The testing model have been investigated their inlet parameters (e.g., air temperature, air humidity, water temperature, and air velocity) it’s influenced on outlet parameters as regenerative performance of ultrasonic humidifier. Humidification process on ultrasonic humidifier have been investigated for effective humidification process that is 0.0186 kg/s air mass flow rate and water layer thickness about 3.5 – 4.5 cm. It can be provided for optimization design on application of ultrasonic humidifier.
Cakalang Fufu Fish processing system using Arduino Uno microcontroller
Authors: Waroh A , Sawidin S , Putung Y , Munaiseche M E I , Lumunon E
Published: March 2020

The fisheries sector is one of the strategic sectors in national development. Traditional fisheries in Indonesia are relatively large, so that community economic increases. In this research, a control device for Cakalang Fufu Fish processing will be made to help businessman, especially in Manado. Usually, the business is done by the community using simple equipment with coconut shell fuel and firewood which causes environmental pollution from smoke that is used for processing and burning eyes. This system includes hardware consisting of temperature sensors, Arduino Uno servo motor microcontrollers, Liquid Crystal Display (LCD), driver relay circuits and fans. While the software on this system uses C Language. The system will work based on the hot smoke generated by Cakalang Fufu Fish smoking process who detected by a temperature sensor that is inputted to the microcontroller to be displayed on the LCD. The temperatures are set in range of 80 to 100 degree C for a specified time of 60 minutes. After the time finished, the alarm/buzzer will sound to indicate that Cakalang Fufu Fish is cooked. As a motor cooler, the fan must turn on to reduce excessive heat so that the fuming is evenly distributed.
K-NN based algorithm for degree of stenosis classification using dual non-invasive photoplethysmography system
Authors: Stephanus A , Du Y C
Published: March 2020

Haemodialysis (HD) patients who undergo long-term treatment are very susceptible to arterial stenosis. In this study, we propose two main features taken from patients undergoing the dialysis process, namely: Rising Slope – RS and Falling Slope - FS. These features are yielded from a photoplethysmography signal extraction on the hand that is used to create vascular access called HD hand. Eleven dialysis patients with the arteriovenous fistula (AVF) method were the object of this study. The feature data was taken twice, before and after the dialysis process. Utilizing the t-test on the variance of RS features on the HD hand showed a statistically significant value of 0.0211 (p <0.05). Furthermore, these RS features are used as input for KNN classifiers to classify degrees of stenosis in patients undergoing HD. Four patient data with RS features from the HD hand that was not previously known became this classifier test data. From the experimental results showed that K-NN with Euclidean and Minkowski distance could classify the degree of stenosis well. The percentage of misclassification of the system against unknown data was 18 percent (82 percent accurate) based on the cross-validated classification accuracy.
Atomistic investigation on the failure of diffusion-bonded Aluminium-Nickel
Authors: Zaenudin M , Mohammed M N , Sunardi A , Al-Zubaidi S , Wijaya H
Published: March 2020

This study presents an investigation on the role of temperature on the failure of diffusion-bonded Aluminium and Nickel. During diffusion bonding processes, where the bulk materials is subjected to join at the temperature of 300 K, 500 K, and 700 K with pressure of 10 MPa for 200 ps, the applied temperature is significantly influencing the final result of diffusion-bonded Al-Ni both in term of qualitative analysis (diffusion behaviour) and quantitative calculation (concentration distribution). In this case, as the temperature increased, the thickness of the interfacial region/diffusion zone is increased. However, when it is subjected to tensile test, the applied temperature is only has a significant impact to the ultimate tensile strength, that as the temperature is increased the ultimate tensile strength is decreased, but the applied temperature during diffusion welding is not influencing both time and strain value of the sample when it starts to failure.
The toxicity and effectiveness of nanoemulsion formulas from Piper retrofractum essential oil against brown plant hopper (Nilaparvata lugens Stål)
Authors: Nuryanti N S P , Jurayrah  , Budiarti L
Published: March 2020

Secondary metabolite compounds of plants have a role as a self-defence against herbivores and pathogens attacks. The objective of research was to study the toxicity, persistence, and effectiveness of extracts and essential oils of Piper retrofractum against brown plant hopper (BPH). Plant extracts were obtained through maceration method using ethyl acetate solvent for P. retrofractum fruit and essential oils obtained by distillation. Extract toxicity testing uses the contact application method. Polo PC program was used to estimate the LC50 and LC95 value. The results showed that essential oil nanoemulsion from P. retrofractum was the most toxic against BPH nymphs compared to other treatments. The toxicity values from nanoemulsion of essential oils, maceration extracts, and non-nano formula from P. retrofractum extracts 0.19, 0.26, and 0.81 percent respectively. The persistence of the three formulas to BPH nymphs seen starting from one day after the application the average mortality decreased to less than 45 percent. The effectiveness showed that the nanoemulsion from extract and essential oil of P. retrofractum were the most effective use to control BPH nymphs in the green house. The results indicated that extracts and essential oils nanoemulsion of P. retrofractum is the most promising as a botanical insecticide to BPH.
Design of workstation in the home industry of Amplang crackers production
Authors: Cahyadi D , Fibrianie E , Irwan M , Susandari H , Tantrika C F M
Published: March 2020

Amplang crackers production in home industry activities carried out with a variety of different body positions while working. From the results of previous studies it was found that the ergonomic position in producing Amplang crackers is the position of standing workers. The problem faced in this research is how to design an ergonomic workers workstation for the standing worker’s position. The results of this study are the design of workstations in the form of tables, chairs and stoves. The table design results in this research have two functions for the work of making the dough and the process of twisting and cutting Amplang. The length of the table is 1000 mm and the height is 1000 mm. The table is 600 mm wide and has a footrest slope of 20 degree. The seat size has a height of 700 mm and the seat width is 400 mm. For the design of the stove has a height of 800 mm and a width of 500 mm, for footrest with a length of 300 mm with a slope of 20 degree. The anthropometry used is Asian women 50 percentile and 95 percentile.
Sprout results characterization of in vitro shoots encapsulation broccoli using sodium alginate
Authors: Nazirwan  , Wahyudi A , Wahyuni A , Yusanto
Published: March 2020

One of the in vitro culture techniques to obtain planting material in vitro is through artificial seed technology. The purpose of this research was to obtain a description and test the effects of sodium alginate on in vitro shoot encapsulation in broccoli. Research result for 7 days of storage the highest germination rate of 10 percent in treatment S1 (2 milligram per litre 6- Furfuryl amino purine (KIN)) which was encapsulated with 2 percent sodium alginate (E1). During the 28 days storage the germination rate increased significantly to 30 percent in the S2 treatment (1 milligram per litre KIN plus 0.5 milligram per litre naphthalene acetic acid (NAA)) and S3 (2 milligram per litre KIN plus 0.5 milligram per litre NAA) which was also encapsulated with E1. The percentage of synthetic seed germination rate correlated closely and positively with the number of seeds form sprouts (r is equal to 0.87). Based on the description data and selection results number of seeds germinating, two encapsulation treatments were selected, that is treatment S2 and S3 encapsulated with E1, which has a sprout stem shape round is not straight. The selected encapsulation treatment can be used for synthetic seed formation by coating.
Smart dunning to improve collection ratio in internet service provider using C4.5 algorithm
Authors: Thohari A H , Anita W S
Published: March 2020

Collection Ratio (CR) is the ratio between the total payments of all customers to the total invoice in the current month. CR is also act as performance indicator of the payment collection division for internet service companies. One method that currently used to improve CR is dunning, namely providing customer with information about the bills with various communication methods including visiting the customer’s address. Large number of customers and limited number of collectors are the major obstacle in the dunning process. We propose a classification method to predict potential delinquent customers, so that the expected accuracy of dunning increases, which in turn increases the company’s collection ratio. We use the decision tree method with the C4.5 algorithm on the historical data from one internet service provider customers in the Riau Islands province, Indonesia. The classification process produces a decision tree with 5, 885 leaves and 6, 765 tree size. The decision tree then evaluated with 10-folds cross validation that resulting in 78.54 percent accuracy, 0.738 precision, and 0.785 recall. The decision tree has been applied to the dunning process of the company.
Time series air quality forecasting with R Language and R Studio
Authors: Setiawan I
Published: March 2020

The purpose of this study is to demonstrate how to make air quality forecasting to predict the Nitrogen Dioxide quality index in the future. In this paper, we demonstrate exploratory data analysis and compare the performance of the Autoregressive Integrated Moving Average and Exponential Smoothing Model. We used R Language and R Studio to integrate all the datasets, exploratory data analysis, data preparation, performing Autoregressive Integrated Moving Average and Exponential Smoothing methods, model evaluation, and visualization. This study used data from the automatic remote air quality-monitoring station located in an urban area in Madrid, Spain. The dataset in the period from 1 January 2001 to 31 December 2017. The dataset recorded six pollutants such as Nitrogen Dioxide, Particulate Matter 10 micrometres, Sulphur Dioxide, Carbon Monoxide, Ozone and Particulate Matter 2.5 micrometres. In this study, we focus only on Nitrogen Dioxide pollutants. From our model, we saw that exponential smoothing has better accuracy compared to the Autoregressive Integrated Moving Average. We also exposed that Nitrogen Dioxide pollutant shows unhealthy for sensitive group’s level in November to March and has the lowest level in June and July.
Direct print technology with Qz Tray for web application transaction
Authors: S Atmaja I M A D , Astawa I N G A
Published: March 2020

A web-based application system has been widely used as an application that handles the transaction processes of a company. The problem faced a transaction web applications are cannot directly print the transaction invoice into the cashier’s printer. To print invoices from a web application, the web application must have quite a lot of supporting applications and enough configuration for the print process to be carried out. For web applications that have facilities for transactions, a technology is needed that can help users to speed up the process of transaction results in the form of transaction invoices. The technology called direct print. Direct print technology can be implemented with a supporting application such as Qz Tray. Qz Tray can help in the printing process directly from a web application that requires a print process into the transaction invoice. Configuration from Qz Tray is quite easy because the assets and coding print functions have been provided by Qz Tray directly. Asset and print function coding can be downloaded and used directly on a web application. The results of direct printing by Qz Tray can also be tailored to the needs of users so the display of invoice prints is as expected.
Cluster implementation on mini Raspberry Pi computers using Round Robin Algorithm
Authors: Rohadi E , Amalia A , Prasetyo A , Rahmat M F , Setiawan A , Siradjuddin I
Published: March 2020

The incredible growth of the internet over the past five years makes the data traffic increase significantly. When a single server gets requests from many clients, the overload will likely occur, so requests from many clients cannot be handled optimally. This results in decreased server performance. In this work, cluster implementation on mini raspberry pi computers using the load balancing method is proposed. This system used the Round Robin Algorithm in the scheduling process in each CPU queue. The implementation of server cluster consisting of Raspberry Pi with the addition of load balancing is done to overcome the limited resources on the server. When clients in the amount of 100, 200, and 500 generated by sending 1000 requests simultaneously on each test, the response times obtained are 67.3 ms, 95.3 ms, and 182.3 ms, while throughputs are 62.50 Kbps, 76.42 Kbps, and 79.62 Kbps, respectively. The results show that the responses time and throughputs are stable with Round Robin algorithm contribution. That means the Round Robin Algorithm has availability in server clustering purposes. The system promises to be an alternative server solution that is cheaper and overcomes resource limitations on the server.
Development of internet-based (IOT) smart tv assistant prototype
Authors: Herpendi  , Noor A , Sayyidati R
Published: March 2020

This study aims to develop a prototype system that is independent and capable of controlling TV automatically via an Android smartphone using the Arduino Uno Microcontroller. This is different from the usual TV remote where the control is limited to standby mode, the system/hardware that is built can control power on and off, so there is no electricity waste due to the TV not being watched by the owner. As it is known that the standby mode on the TV still consumes 10.96 watts of electricity. The media used for control are Bluetooth and Wi-Fi. Control with Bluetooth via an Android smartphone has 3 features which by pressing the on-off button, with voice commands and time settings, while controlling via Wi-Fi is by accessing the website. The test results show control via Bluetooth gives a response less than 1 second with a distance of less than 11 meters, via Wi-Fi gives a response of 1-4 seconds. If the TV owner has set the time the TV will be automatically controlled by the power off hardware as an assistant even though the TV owner has fallen asleep and the electricity is not wasted because the TV is still on.
Model design for grammatical error identification in software requirements specification using statistics and rule-based techniques
Authors: Putra F P , Enda D
Published: March 2020

The statement of functional requirements statement that refers to software requirements specifications (SRS) is a reference for stakeholders in making software. The SRS document uses a different English grammar due to limited knowledge by the software development team, making it difficult for the development team to read and understand the specification documents for software requirements properly. To overcome this grammatical error, a method is needed to resolve grammatical errors. The method used to identify grammatical errors is based on a trigram language model. In the last research, trigram language models showed quite good performance in identifying grammatical errors based on probabilistic n-gram language models. To improve the performance of the n-gram language model this study also utilizes a corpus namely Penn Tree Bank Corpus. Provide recommendations, this study uses rules-based techniques. A number of rules are made to provide recommendations for inappropriate grammar. So that the software requirements specification compiler can check for grammatical errors and improve the quality of the software requirements specification document.
Development of NFC and IoT-enabled measurement devices for improving health care delivery of Indonesian children
Authors: Sutjiredjeki E , Basjaruddin N C , Fajrin D N , Noor F
Published: March 2020

In this research, a prototype of NFC and IoT-enabled medical measurement device aimed for infants between 0-5 years old is designed. The device is aimed to record data and transmit them to NFC tags on a greater system containing electronic medical record of Indonesian children, which is normally recorded in a paper card named Kartu Menuju Sehat (KMS). The device can measure five parameters: height, weight, temperature, heart rate, and blood oxygen (SpO2). The result is passed to a sensor fusion system to determine health status of the child, after which the data is transmitted to mobile KMS application owned by child’s guardian and health personnel. The system is tested on 12 infants of 12 months and below in two Indonesia’s community health centre Posyandu units. Based on the result, the system is able to measure five parameters at once and transmit it to the health personnel and child’s guardian, making it feasible to develop the prototype further into a fully functional medical device for use with electronic KMS.
The implementation of radius server for wifi pass using the mechanism of access point controller in Department of Electrical Engineering building, Bali State Polytechnic
Authors: Indah K A T , Wardana I N K
Published: March 2020

The problem in accessing the internet network in the Department of Electrical Engineering is that there is no security for WLAN, only normal login page to access to the network. In its application wifi pass requires Radius Server to authenticate against remote network access using Virtual Private Networking (VPN), wireless access points, ethernet switches. Radius Server can protect wireless networks from spoofing MAC Address and also WEP/WPA crack using free Radius authentication. Another problem is to monitoring access points in the area still manually done by IT administrators. With the application of the Radius Server which is a means of wifi pass application, and the access point controller application for monitoring all access points. It will facilitate IT administrators in the operation and maintenance of existing internet networks. Based on the measured QoS table, the hotspot network at the Department of Electrical Engineering for the largest parameter is AP Signal 53 dBm, Bandwidth 1036 bytes, throughput 198, 735 bytes, 14 ms delay, jitter 36, 777 ms and packet loss 3 percent. The technology used is 802.11 G Wi-Fi that uses DDWRT which has an Extensible Authentication Protocol (EAP) system that supports the implementation of facilities at Radius Server.
Study of data format for small vessel tracking based on LPWAN network
Authors: Sumarudin A , Putra W P , Rifai A , Putra A E
Published: March 2020

Implementation of LPWAN very large application, such as remote location, agriculture, mining, and transportation. This paper discusses for data format on implementation small vessel tracking for traditional fisherman. data format is very important for tracking system can be monitoring vessel simple. data format can be optimized perform on IoT network, such as delay, bandwidth, range and power consumption energy. Data format with 68 Bytes Strings stream to gateway Lora every 3 seconds. Data format for gateway to Broker server utilize MQTT format with 4-way connection, such as connect, connect ack, publish data and disconnect. Based on experiment, data format can use robust for small vessel and can implemented on this application.
An internet of things-based smart homes and healthcare monitoring and management system: Review
Authors: Mohammed M N , Desyansah S F , Al-Zubaidi S , Yusuf E
Published: March 2020

Since the term of a smart city was proposed, Internet of Things (IoT) has been considered as the infrastructure’s key in a smart city. Huge research consideration is an emphasis on remote wellbeing observing system dependent on IoT technology. IoT is the internetwork of physical objects or “things” that are embedded with software and sensors to collect and send data between them and central servers with minimum human intervention. This term can assist decline with constraining on medical clinic system and healthcare suppliers, decrease insurance costs, and improve healthcare. In the modern healthcare environment, IoT is being used in various medical areas like real-time monitoring, patient information management, medical emergency management and blood information management. Over these years a number of advanced applications based on IoT have been proposed for convenience of patients, doctors and caregivers in the healthcare sector. Therefore, the current study describes the applications of IoT technologies in medical and healthcare field. Moreover, the it highlights the huge potential of this process and future directions for further research.
Measure distance locating nearest public facilities using Haversine and Euclidean Methods
Authors: Maria E , Budiman E , Haviluddin  , Taruk M
Published: March 2020

The application of finding the nearest public facility using 2 methods to measure the distance between 2 points, i.e. the Euclidean Method and the Haversine Formula. Euclidean is a heuristic function obtained based on direct distance without obstacles such as to get the value of the length of a diagonal line on a triangle. Whereas Haversine is an equation that looks for the distance of an arc between two points on longitude and latitude. The results of the calculation of the average distance Euclidean deviations with an average value of data 2.539764, and Haversine 2.536912. This shows that the comparison of the measurements of the distance between Euclidean and Haversine has a difference of 0.002852 or the percentage of the distance between the two methods is 99.89 percent. Of the two methods, which yield values almost by measurements on Google maps is Haversine. For Euclidean, it is used to measure the distance between two points on a flat plane so that the results have differences when compared to the Haversine formula.
Applied optical flow algorithm (OFA) in automatic target tracker system to control weapon movements in the warship
Authors: Sidi P , Adhitya R Y , Khumaidi A , Syaiin M , Endrasmono J , Sutrisno I
Published: March 2020

This research has made a tracking system to track the target, the purpose of this prototype is being able to be applied in the warship cannon guns. The system principal is tracking the targets that have been chosen to be targeted by the operator. This device works with the camera as the main sensor, the camera works to provide visual data, the visual data as an object was selected and processed to be targeted. The visual data is processed using the Optical Flow Algorithm (OFA) method by calculating the brightness intensity of the reference. The next step is finding the centroid value as the centre point for distance measurement. These results were converted into a microcontroller program that will move the direction of the tracker to follow the target which captured by the camera. The results of the object tracking test on this tool from 10 attempts can detect objects with an average accuracy of 100 percent at a distance of 1 to 9 meters. For testing the target lock, this system can reach the set point value within 2 seconds with the steady state error of 0.625 percent and the selection of the best proportional constant of 0.2.
The effect of Theobroma Cacao peels extracts inhibitors on mild steel fatigue behaviour
Authors: Yetri Y , Rakiman  , Gunawarman  , Hanif
Published: March 2020

This research relates with polar extract ofTheobroma cacaopeels as an inhibitor for corrosion to improve the fatigue properties of steel. The polar extract of cacao added varies from 5 percent to 2.5 percent, with 1.5M HCl corrosive media, and 32 days immersion time. To see the effect of corrosion, the steel is immersed in solution of HCl which has been added corrosion inhibitors. The results obtained were characterized by AFM, SEM, Energy Dispersive X-Ray, and fatigue strength testing using the ASTM E4662002 procedure. The results of adsorption during immersion showed that inhibitors were able to reduce the corrosion rate and increase inhibitory efficiency, thereby increasing the fatigue properties of mild steel. Surface analysis shows that surface topography looks smoother, because of adsorption on the surface in the form of a film layer that can decrease the corrosion attack. This smooth surface seems effective to avoid initiation of cracks on the surface of steel. Immersion of steel for 32 days in solution HCl 1.5M with 2.5 percent addition of cacao peels polar extract of are very effective to minimize corrosion attacks on surface of steel, then is able to recovery the fatigue properties of mild steel.
The effect of changing superheat degrees on energy consumption in a split air conditioning
Authors: Ardita I N , Wirajati I G A B , Sudirman
Published: March 2020

Split air conditioning is the most widely used in the community for both commercial and domestic purpose. But it can cause inefficiency or waste of energy use by the system. For this reason, it is very important to keep the system working in optimum conditions to prevent wasteful use of energy by the air conditioning system. This research will re-investigate the effect of the superheat degree of refrigerant coming out of the evaporator on the system’s energy consumption. This research is conducted by analytical methods and experimental methods whose implementation includes; designing and manufacturing of experimental equipment, installation of measuring instruments experimental data retrieval, data processing and yield analysis. Data processing is done by using thermodynamic methods to get the desired quantities such as; compressor power consumption, refrigeration effects and coefficient of performance (COP). The results were carried out by quantitative descriptive method, namely by analysing changes in the superheat degree of compressor energy consumption. Based on the analysis results show that if degree of superheat is increased, compressor energy consumption increases for all refrigerants used. Whereas COP system decreases for R22 refrigerant, is relatively constant for R410a refrigerant and raises an increase for other refrigerants tested.