bluuebunny/crossref_metadata_2025 huggingface dataset:
System for determining lahar disaster status using machine learning method
Authors: Hapsari R I , Sugna B A I , Rohadi E , Asmara R A
Published: January 2020

Lahar disaster is an event of material transport such as sand, gravel, and rocks following volcanic eruption that is triggered by intense rainfall. The disaster on the slope volcano induces a potential loss that include casualty, damage or loss of property, and environmental disruption. Therefore, a system of lahar flood warning system is needed to help determining the status of flood disasters on the volcano slope. In this study the system of lahar vulnerability estimation is developed. The target area is a river on Merapi volcano Indonesia. Naïve Bayes Classifier Method is applied to classify areas categorized as flood-prone zones or safe zones. The determining factors are spatially distributed rainfall intensity from X-band weather radar, topographical factor, and soil type. This research has produced a flood disaster status determination system on the slopes of Merapi with an accuracy rate of 84.6%, from the results of taking 10% of the training data. The output of this system is an information system shown in vulnerability map that provides information about the status of susceptible zones to lahar flow.
The characteristics of Asphalt Concrete – Wearing Course (AC-WC) mixture using Buton Rock Asphalt (BRA) with Oily Sludge (OS) as a rejuvenator
Authors: Astor Y , Sufanir A M S , Utari W Z
Published: January 2020

Indonesia is a country that has an abundant supply of natural asphalt, namely Buton Rock Asphalt (BRA). The problems faced by the BRA pavement as a binder is the quality of asphalt concrete produced cannot yet compete the oil asphalt pavement as a binder. Therefore, researchers use Oily Sludge (OS) as a BRA rejuvenator. In this study, a test is conducted to identify the behavior and characteristics of Marshall and dynamic stability on the mixture of Asphalt Concrete – Wearing Course (AC-WC) with the use of BRA as a binder and an OS as the rejuvenation material of BRA. The variation of asphalt content used are 4,5%, 5%, 5,5%, 6%, and 6,5%. Based on the result of the test, the dynamic stability value of asphalt and BRA mixture that has been rejuvenated has a higher dynamic stability value than the mixture without BRA.
The road drainage planning for flood control in Dr. Djunjunan road, Pasteur – Bandung
Authors: Damayanti M , Sutrisno M , Karnisah I
Published: January 2020

Recently, flood is an important phenomenon which often occurs in cities recently. The Case of this paper is the flood in Dr. Junjunan Road which is the one of high density roads in Bandung and the main road to Cipularang Toll Road. The flood’s inundation depth on this road is up to 40-50cm, and the average of flood duration is about 30 minutes. The rainfall used for calculation in this research is a return period 25 years with the rainfall value of 80.1 mm. The solution for reducing the floods is by increasing the drainage capacity as well as increasing the water infiltration to the ground. The research method uses the physical experimental model, using the scale mode of 1:30. The experimental results are tested through validation process using Hec-RAS 5.0.7. The experiment uses two variables, in which changing two drainage streams and diverting a river which leads to Citepus river through Box Culvert. The results of the validating model indicate that increasing the drainage capacity along the Road is the most effective solution in decreasing the potential of floods.
The reservoir porous as a solution to control the urban flood in Pagarsih road Bandung
Authors: Darajatun A , Sutrisno M , Budianto B S
Published: January 2020

Urban floods have become a critical phenomenon recently. Which are mostly caused by the fast increase of building growths. The need of mitigation of floods to save road users becomes an important aspect in urban area. This paper is to find a solution the case of flood in Pagarsih Road which was occurred at 2016 with standard the rain falls cycles for 25 years. The characteristic of Pagarsih Road floods is due to the overflow of Citepus River which lays beside the road. A kind of the road infrastructure proposed to solve the problem is a porous reservoir which functioned as the water storage of run off. The method used in this research is a simulation using a physical model as well as the manual calculation using Hec Ras. The model is to simulate the existing condition as well as the proposed solutions. The alternative solution developed is tested by providing several reservoir volumes and also by adding porous facilities to increase the reservoir capacity. The validation test is carried out by using HECRAS-5.0.7 to achieve a certain reliable solution. The result shows that the reservoir storage capacity is the dominant parameter to mitigate the risk of floods.
The solution of traffic congestion due to side frictions along the market area at national arterial road Tanjungsari Sumedang
Authors: Assaury M S , Sutrisno M , Astor Y
Published: January 2020

Side frictions along the market area of Tanjungsari often cause traffic congestion during peak hours. The traffic congestions are caused by the high frequency of side frictions, which may decrease the effective road capacity. This paper to seek the influence of the dominant side frictions using the degree of saturation, as well as provide some effective alternative solutions to rural standard for 10 years. The two alternatives solutions, such as by widening road up to 2 meters and detouring with widening road up to 3.5 meters. Are the analysis results shows that, the most effective alternative solution is a detouring with widening road up to 3.5 meters because it can correspond with rural standards for next 10 years. The other reason considering the operation of Cisumdawu toll road may reduce traffic flow by 28% to 34% along market area using rural service standard. The predicted result, which relies on degree of saturation when Cisumdawu toll road has been operated is 0,51 for the direction of Bandung-Sumedang, otherwise is 0,74 of Sumedang-Bandung.
Cognitive artificial intelligence application to cyber defense
Authors: Sumari A D W , Setiawan A , Syamsiana I N
Published: January 2020

Predicting or estimating the occurrence of a cyberattack has been a challenge for various sectors including defense one. In this paper we propose a new method for making a prediction or an estimation of the occurrence of cyberattacks in terms of the attack type or category and when the attack(s) would be possible to occur. Our method based on Cognitive Artificial Intelligence (CAI) approach called as Knowledge Growing System (KGS). For this purpose, we did a simulation using random numbers which were generated based on the real data from UNSW-NB15. From the simulation results, we can conclude that CAI is able to deliver a prediction or an estimation of the occurrence of future possible cyberattacks.
Design of the early fire detection based fuzzy logic using multisensor
Authors: Rachman F Z , Yanti N , Hadiyanto H , Suhaedi S , Hidayati Q , Widagda M E P , Saputra B A
Published: January 2020

The purpose of this study is to create an early fire detection system based on fuzzy logic. This system provides early warning of fire hazards, reduces the risk of casualties, and is able to be implemented to a wider scale or scope. This system consists of a multisensor to detect fire, smoke and temperature in the room. KY-026 sensor as fire detection, MQ-9 sensor as smoke detection and DS18b20 sensor as temperature detection. The results of the sensor readings are processed by a microcontroller implanted with a Sugeno fuzzy logic method. Sensor input is processed through several stages, namely fuzzification, rule evaluation and deffuzification. The output from this system is a condition value between 1 and 5. The average error of testing between Arduino modules with Matlab is 0.99%.
Fuzzy topsis optimization on expert systems for core competency detection and Islamic religious education student learning achievement at Perguruan Tinggi Keagamaan Islam Negeri (PTKIN)
Authors: Sutiah S , Supriyono S
Published: January 2020

The research aims to assess the development and implementation of Fuzzy Topsis optimization on core competency detection expert systems and student learning achievement majoring in Islamic religious education at PTKIN. In the learning process of KKNI based curriculum designed to detect the level of development of core competencies and achievements Study students at the faculty or PAI study Program at PTKIN. The main product development of this research is expert system application With the Fuzzy Topsis method of measuring the indicator Development of Core Competencies (Hard skills and soft skills) and Learning factors that have an effect on student learning achievements. The results of this expert system can help students and lecturers independently to detect how the level of development student core complications, detecting internal learning factors and external influences and measures how they influence to student learning achievements. Optimizing Results of Fuzzy TOPSIS shows optimal results better.
Evaluation of university accreditation prediction system
Authors: Musthafa M B , Ngatmari N , Rahmad C , Asmara R A , Rahutomo F
Published: January 2020

Higher education accreditation body (Badan Akreditasi Nasional Perguruan Tinggi/BAN-PT in Indonesian) is an Indonesian body with the main task to assess the quality of Indonesian university. The assessment result is called accreditation, which has 5 years of validation time. In order to monitor the quality, University has an internal mechanism which is called an internal quality assurance system (Sistem Penjaminan Mutu Internal/SPMI in Indonesian). Usually, SPMI assesses the quality periodically, one or two times each year. This process needs much effort, i.e. time, manpower, and financial cost. Sometimes, internal auditor of the university does not have sufficient knowledge, as much as BAN-PT assessor. This condition causes a lack of assessment accuracy, then causes the quality of SPMI itself. On the other hand, University has abundant of condition data, saved in higher education database (HEDB). This paper proposes to exploit the availability of data in this case. Therefore university able to monitor the quality by machine learning process periodically without much effort as manual SPMI process. Furthermore, this paper evaluates two machine learning methods, i.e. naive Bayes and K-Nearest Neighbor (K-NN). This proposal exploits several data: student, academic, admission, and alumna. K-NN and naive Bayes work in registrant and capacity ratio, student registration ratio, average student Grade Point Average (GPA) in late five years, and on-time graduation scale. The experiment results show the average accuracy of naive Bayes and KNN are 70% and 95.2% respectively.
Recognition of the character on the map captured by the camera using k-nearest neighbor
Authors: Harijanto B , Amalia E L , Mentari M
Published: January 2020

Maps are one form of an image that often encountered in various interests. For example, many books on tourist attractions or other information that provide maps as a media of information. However, sometimes people with visual impairments such as presbyopia, hypermetropia, or astigmatism have difficulty reading the map which is usually given in small size, multi orientation (multi-scale and multi-direction). Therefore, this study tries to provide a solution through an application that converts image to text in image conditions that have many orientations and different things are briefly called heterogeneous text. The Optical Character Recognition (OCR) system that was built beginning with taking pictures made through a cell phone camera as the first step in obtaining a digital map file, then enters the pre-processing, text segmentation, feature extraction from each different character, then continues to the classification stage. This OCR system for recognizing text with multiple orientations will help people make digital maps easier to read, especially for people who have presbyopia, hypermetropia, or astigmatism vision problems. The proposed model achieves good average accuracy for classifying the characters in various orientation successfully.
Security system design for cloud computing by using the combination of AES256 and MD5 algorithm
Authors: Khakim L , Mukhlisin M , Suharjono A
Published: January 2020

Data is a collection of information that is combined into one and has a very important meaning. In the study, the object to be secured is the password data, the encryption method Advanced Encryption Standard (AES) with a key length of 256 bits, before the data is encrypted with method of AES, the first password will be encrypted using MD5, and the second one will be encrypted again using the AES256 method. Based on trial data conducted through two sites about the complexity of passwords, it can be concluded that the original data (before encryption) no 1 to 5 increased to 32 bytes after being encrypted by the MD5 method, and its size increased again to 88 bytes after being encrypted by the AES256 method. Data can be obtained by value original data AES256 is 9, 96 times larger than its original size, would be but the value of the complexity of her also increased in line with the increase in the number of characters or the byte size of the data password above, thereby increasing the level of difficulty by the party that will hack the login data in the cloud.
Historical role-playing game application of Sunan Ampel
Authors: Fathoni K , Adventure E T , Bagar F N C
Published: January 2020

Sunan Ampel is a religious figure and one of the legendary members of Walisongo in Surabaya even on Java. The history of Sunan Ampel is rarely known by the public or even very little information is known about him. This is because the existing references are still limited, difficult to obtain and not interactive. Therefore, we need media that can describe the history of Sunan Ampel interactively and not based on textbooks. This can be overcome by developing game-based Sunan Ampel historical applications. This game is built with two-dimensional characters and the genre of Role-Playing Game. There are 3 phases in the history game Sunan Ampel, namely: the phase in Wonokromo, the phase in Yellow Flower, and the phase in Ampel. Some NPCs are involved such as some wild animals, residents, Kibang Kuning and Prabu Brawijaya. The black box testing of interface and game design results show that all game features are running well on desktop platforms and the games storyline has illustrated some of the history of Sunan Ampel.
Rough set and machine learning approach for identifying flow experience in e-learning
Authors: Sahid D S S , Efendi R , Putra E H
Published: January 2020

Flow experience as a psychological theory has been implemented in various fields, especially in games and marketing. Flow is an optimal condition that someone feels immersed, focused and enjoy an activity. Based on this theory the psychological experience is represented as anxiety, boredom, and flow. Considering the psychological conditions in learning activities can improve the performance of students. Thus, involving the flow experience in learning process particularly in e-learning environment becomes very interesting and challenging. This challenge is how to identify the student flow experience during interaction students with the e-learning. In the previous study, flow was measured by conducting a series of questionnaires after a learning process. This is very inefficient, especially if applied in an adaptive e-learning. Additionally, this measurement is often unnatural, since it cannot capture the students learning behavior. Therefore, this study presented flow experience identification when students interact with e-learning using rough set and machine learning approach. Rough set is an efficient tool to solve the uncertainty, imprecision, and vagueness. While, the fuzzy rule and decision tree, as part of machine learning methods were implemented as a comparation. The identification was done using learning behavior parameters included duration of access, frequency of access, assessment score, and duration time to complete the assessment. As the results, the rough set can identify the flow experience with accuracy level is 92.92%. On the other hand, the fuzzy rule and decision tree provide accuracy level are 91.86% and 92.39%. As a conclusion, this study showed that the flow experience could be measured with the high accuracy level. In the context of e-learning, it can be used by e-learning to provide an adaptation. Appropriate adaptation is expected can keep the psychological condition of the students in optimal state.
Design and implementation: Portable Floating Pico-Hydro
Authors: Dewatama D , Fauziah M , Safitri H K , Adhisuwignjo S
Published: January 2020

Malang City which is located at an altitude between 440 - 667 meters above sea level, and surrounded by mountains. Thus, the city of Malang has many springs and rivers with high speed flow. At present, river flow energy that used as hydroelectric power is very least. River flow hydroelectric power schemes are often presumed to be less ecologically damaging than large-scale storage hydroelectric power schemes, and then low priced materials, easy to use and easy to care for. Therefore, researchers have design of Portable Floating Pico-Hydro (PFPH). PFPH using a low speed DC generator (500rpm, 18VDC, 15A), controller, DC-DC converter and battery as a load. Voltage output of PFPH is set to have a constant output of 14 volts DC with PI control algorithm. Specifications of PFPH are turbine diameter is 500mm, turbine width is 500mm, overall length is 1200mm and overall width is 1200mm. PFPH tested at a water speed of 1.5 m/s - 4 m/s and generated power 10W-223W.
Design of SCADA for Load Frequency Control prototype using PLC controller with PID algorithm
Authors: Wibowo S S , Syamsiana I N , Kurniawan B I
Published: January 2020

Frequency deviation from the nominal value of 50 Hz must be within the allowable tolerance limit of 2%. Load changes contributes to vary the frequency then settings are needed using LFC (Load Frequency Control) which controls speed of generator. From the issue, the research is about of making a learning prototype for the control system. Frequency is set using a Programmable Logic control (PLC) Twido TWDLMDA20DUK by using a Proportional Integral Derivative (PID) algorithm and can be supervised via SCADA. The results of experiments were analysed their stability of frequency and speed. PID values are obtained from Ziegler Nichols method and Auto Tuning. Close loop experiments shows that with a value of Kp = 1 Kd = 0.115 Ki = 0.49 can improve the frequency 49.41 Hz at 3.5 Nm load. The transient response at steady state which is 50 Hz, the Ziegler Nichols method has a rise time value greater than the other methods of 21.09 ms, the overshoot is relatively small, 0.492%, settling time 0.03s and steady state error of 0.004 so that when the load changes the stability response of the Ziegler Nichols method is faster than the other methods.
Analysis and testing of DC motor control system for electric bike
Authors: Parastiwi A , Al-Akbary P C M , Safitri H K
Published: January 2020

The proposed electric bike is driven by using a 24V350WDC motor and VRLA 24V battery as a source of voltage. Input point settings are done by pressing the speed control button in the form of digital data, which is then converted to voltage by the microcontroller. The output of the microcontroller in the form of a PWM becomes input for the motor driver, where the output speed of the motor will be detected by the speed sensor. The automation used is the PI method using the Zeigler Nichols 2 tuning formula. The control method using PI had been analyzed and tested, resulting in Kp=3.37 and Ki=0.73. The electric bike has been tested with different loads. The proposed electric bike was successfully controlled and able to be driven with a minimum speed of 5km/h and a maximum speed of 20km/h.
Design of an early fire detection system based on GPS module
Authors: Rachman F Z , Yanti N , Jamal N , Purwanto E , Hadiyanto H , Suhaedi S , Sorongan E
Published: January 2020

The purpose of this study is to build an early fire detection system that is able to detect the conditions of the environment and the results are informed quickly on the incident area and fire department. The research method used was experimental using Arduino Uno, GPS Ublox Neo 6MV2, SIM900A and three sensors such as fire sensors, smoke sensors and temperature sensors. All sensors function as a fire indication detection system. The results of the system test obtained an average GPS error of 1.6% with an accuracy of reading shifts and the average distance obtained was ± 4 meters. The average data transmission speed between Providers is 1 second because the processing time and sending speed are in line with the network conditions and the capabilities of the GSM module used.
Speed controller of wind turbine emulator using variable speed drive based on PI method
Authors: Rifa’i M , Mandayatma E , Putri R I
Published: January 2020

The wind turbine system as a power plant is growing rapidly in line with the electrical energy needs and limitations of fossil energy as a source of electrical energy. Many research has been carried out to develop wind turbine systems and improve system efficiency. Research on wind turbine systems requires wind turbine emulators to simulate the behaviour of wind turbines against changes in wind speed. In this paper presents a design of speed controller based on PI controller for a Wind Turbine Emulator (WTE) using a Variable Speed Drive (VSD). WTE consists of VSD, microcontroller, 3 phase induction motor, Permanent Magnet Synchronous Generator (PMSG) and speed sensor. PMSG speed depends on wind speed. At certain wind speeds, PMSG will rotate at a certain value. WTE will adjust the speed of the induction motor according to a certain wind speed to drive PMSG. Motor and PMSG rotation speed are measured by rotary encoder sensor as speed sensor and feedback for WTE. Proportional-integral method is used to control the speed of a 3 phase induction motor through VSD analogue input. Based on experiment result, PI controller can adjust speed of induction motor so that PMSG will rotate according to a certain wind speed. WTE with PI controller controls the speed of induction motor at settling time 9s to simulate wind speed through PMSG speed controlling.
Optimization of 1 phase induction motor speed in the process of filtering soybean pulp using PI control method
Authors: Adhisuwignjo S , Dewatama D , Fauziah M
Published: January 2020

Tofu is one of Indonesia’s special foods made from fermented soybean juice. There are several processes in making tofu. One of them is the process of filtering the juice with soybean waste. The filtering process will determine the quality and quantity of tofu. The better filtering process, the more juice are produced. The purpose of this study is to improve the results of the soybean pulp filtering process. One way is to use an induction motor for a spinner filter machine with adjustable speed. To set the speed is using VSD as a motor driver. VSD output is a frequency that can be used to regulate the speed of the induction motor. Determination of motor speed is using the PI Ziegler-Nichols oscillation tuning method so that a stable motor rotation speed is obtained. Kp value = 0.108, and Ti = 0.83 with load test conditions and 700rpm set point has the characteristics of the system response% error steady state = 7.5%, rise time = 4 sec, settling time = 4.5 sec and% over shoot = 0%.
A low public awareness of illegals red colorants usage: A case study in ketchup and crackers at traditional market of Sukolilo Surabaya
Authors: Rachmaniah O , Rahmawati Y , Suari N M I , Kurniawansyah F , Bhuana D S , Ningrum E O , Puspita N F , Puspitasari A , Fakhrinanda F , Istiqomah I , Muhsin M R , Widya A P
Published: January 2020

The low public awareness to unhealthy food products causes many unhealthy and unsafe food products still found and distributed, especially, in the traditional market. Food additives, synthetic colorants and sweetener, are widely applied in food due to its stability, attractive in colours, and cheaper. Therefore, a survey and determination of illegal reds colorants, Rhodamine B, conducted particularly in ketchups and crackers in Sukolilo Area of Surabaya, East Java, Indonesia as well as three others legal reds colorants red allure, erythrosine, and ponceau 4R. Seven traditional markets at Sukolilo district: Keputih, Gebang Putih, Menur Pumpungan, Nginden Jangkungan, Semolowaru, Klampis Ngasem, and Medokan Semampir, were sampled. Instead of ketchup and crackers, beverages, and traditional cakes are also classified containing reds colorant. They are 38 samples were collected from six traditional markets at Sukolilo district: ketchup 31.58%, crakers 5.26%, beverages 23.68%, traditional cakes 28.95% while the rest is classified as other, i.e. seasonings and sausages. None of those are found at Medokan Semampir traditional Market. None of the collected ketchups contain Rhodamine B. Ponceau 4R and Erythrosine are the common red colorants detected in the ketchups. All the crackers and some samples of traditional cakes that mostly homemade do contain Rhodamine B.
Agricultural drought monitoring based on vegetation health index in East Java Indonesia using MODIS Satellite Data
Authors: Kirana A P , Ariyanto R , Ririd A R T H , Amalia E L
Published: January 2020

Agriculture is among the most vulnerable of all sectors to drought. Droughts cause serious effects on the agricultural sector due to its heavy dependence on rainfall. In the present work, we use the Vegetation Health Index (VHI) of MODIS Data as drought indices to monitoring the drought over East Java, Indonesia. VHI is computed based on the vegetation index and land surface temperature which are very important satellite products for drought monitoring with remote sensing. VHI describes vegetation health from the combination of TCI VCI. Based on VHI monitoring drought area distribution increase 3.69% in period 2017-2018. The highest distribution of drought area occurs in July to October. Average distribution of drought area is 22.24% in 2017, and 25.93% in 2018 from total wide 1.174,586 km2 of paddy field area. Based on VHI value in 2017 to 2018 the drought maps in agricultural area of East Java were dominated by moderate drought.
The effect of sodium hydroxide concentration on yield and properties of Bacterial Cellulose membranes
Authors: Kamal A S M , Misnon M I , Fadil F
Published: January 2020

Bacteria cellulose (BC) derived from Acetobacter xylinum strain possess several advantages such as elevated water holding capacity, high porosity and excellent mechanical strength. BC is useful to replace vegetal plant and applied into various industrial field such as papermaking, packaging and textile. In this study, BC membranes were produced from coconut water based consists of 8.0% sugar, 0.5% ammonium sulphate and 1.0% acetic acid at pH 4.5, followed with the addition of 10.0% inoculum before subjected to static incubation for 7 days. This study evaluated the changes of BC membrane properties using different concentration of sodium hydroxide (NaOH) under room temperature within 24 hours. The morphological, physical, chemical structure and water vapour permeability (WVP) of BC were analysed using FESEM, XRD, FTIR and WVP analysis, respectively. Results show that BC is mainly consist of cellulose I± with high crystallinity and smaller crystallite sizes. The differences in NaOH concentrations varied the fibrils diameter of cellulose, in accordance to FESEM images. The use of higher concentration of NaOH (≥ 2.0%) gave a smooth cellulose structure with less porosity, thus reducing the WVP properties of BC.
Food awareness of college students consumers towards unhealthy snacks: A case study of food colorant at “Bundaran ITS” landmark of Institut Teknologi Sepuluh Nopember (ITS) Surabaya during Ramadhan festival
Authors: Rahmawati Y , Suari N M I , Kurniawansyah F , Bhuana D S , Ningrum E O , Puspita N F , Puspitasari A , Fakhrinanda F , Istiqomah I , Muhsin M R , Widya A P , Rachmaniah O
Published: January 2020

The high number of registered college students of Institut Teknologi Sepuluh Nopember (ITS) in 2018/2019 academic year as well as their neighbour polytechnics, i.e. Politeknik Elektro Negeri Surabaya (PENS) and Politeknik Perkapalan Negeri Surabaya (PPNS), makes them as potential consumers in food industry. Most of them purchase food or beverages from the inside-campus food service, canteens. However, during the Ramadhan festival, most of the canteens are closed. Therefore, many seasonal food stalls are open for business at “Bundaran ITS” starting at 15.00 until 20.00 WIB (West Indonesian Time Area), providing food or beverages for breaking the fast. Therefore, a survey was conducted to check the healthiness of the food, meaning the food colorant additive especially red colorants. Moreover, this study also examined relationships among healthy food awareness, behavioural intention toward healthy foods, and actual behaviour of the ITS consumers. Thirty-seven (37) samples were collected during two periods of survey, at 9-12 May 2019 and 28-29 May 2019. The collected samples focused on the samples that might have red colorants. The collected samples were classified into three categories: beverages (32.43%), ketchups (54.05%), and snacks (13.51%). Gratefully, none of them contained Rhodamine B.
The decrease of high chlorine on seaweed industry wastewater
Authors: Prayitno P , Rulianah S , Maryanti Y , Putri P O
Published: January 2020

In the seaweed processing industry to obtain quality products that are free of microorganisms, high concentrations of chlorine are used in the cooking process. Thus the wastewater from the cooking process still contains high concentrations of residual chlorine, where the wastewater when disposed of into the aquatic environment can cause pollution and damage of environmental. The aim of the research is the reduction of high concentrations of residual chlorine in seaweed wastewater using a combination process of aeration, heating and addition of Hypochlorous acid (HCl). The experiment was conducted by adding wastewater from the seaweed cooking process with HCl (1; 2; 3; and 4% v/v), aeration flowrate (1; 1.5; 2; and 2.5 Ls/minute) and heating temperature (35; 40; 45; and 50°C). Residual chlorine concentration was measured using the iodometric method. The experimental results showed that the maximum reduction of residual chlorine by 96.3% was obtained by adding HCl by 3%, aeration flowrate of 2.5 L/minute and heating temperature of 45°C.
Comparing method equivalence class partitioning and boundary value analysis with study case add medicine module
Authors: Aryandana I G S , Permanasari A E , Adji T B
Published: January 2020

Software Testing is helpful to alleviate the developers’ task in improving the system. But in doing software testing, there are problems faced by developers, including information that become a benchmark in the feasibility of software testing. Many factors are used to obtain information or benchmarks. These factors can include line code, program structure, business processes and the time used in conducting trials. A test case is needed to ensure one of the two testing processes. The first is to make sure the data type of the entered data. The method of this process is called Equivalence Class Partitioning (ECP). The second is ensuring the lower bound value, the middle bound value, and the upper limit value of the number of strings as inputs of a system module. The method of this process is called Boundary Value Analysis (BVA). The purpose of this study is to compare the ECP and BVA methods. The expected result of this study is to find out the best method between ECP or BVA. Comparison of calculations using standard matrix testing. This study uses 5 parameters as benchmarks. Based on this study, the ECP method is superior to BVA with 5 parameters used as benchmarks.
Decision support system for determining the activities of the study program using the Preference Selection Index
Authors: Puspitasari D , Wijaya I D , Mentari M
Published: January 2020

Each year the study program carries out activities that have been planned through departmental meetings. However, study program activities that are not on target will result in less accreditation scores. Accreditation is a government effort to guarantee the quality of educational institutions. The value of accreditation determines the main assets in the field of education, the quality of study programs and the feasibility of graduates. Therefore, this study tries to provide a ranking formula for study program activities based on the assessment of study program accreditation forms. The system is built using one of type multi-criteria decision making (MCDM), namely the Preference Selection Index (PSI). PSI method using statistical concepts until preference index as a reference for alternative ranking. This developed system can help the department to recommend the main activities that can be done to support the efforts of the study program in achieving optimal accreditation values. Finally, it was concluded that the PSI method is the right method for problems that require decision support with a large number of attributes, such as the criteria used in recommendations for study program activities that have been adapted to the study program accreditation form assessment matrix.
Developing a social media-based Chatbot for English learning
Authors: Sarosa M , Kusumawardani M , Suyono A , Wijaya M H
Published: January 2020

The increasing number of foreign companies offering job vacancies in Indonesia is a blessing for new graduates. However, they could not use the opportunity due to their limited English skill. This condition may occur because there is a lack of human resource providing direct, gradual, and continuous assistance to improve their English skills. Nowadays, social media are very popular among various groups of people but they are mostly used for information exchanges. This study aims to develop an application inside Facebook as an English learning media to help students learn English more efficiently. This application is in the form of a Chatbot (an answering robot) as a substitute for a teacher to help those who have difficulties in learning English. The Chatbot integrated in the social media is expected to provide an easier adoption as the users are already familiar with its interface and navigation. This application has been applied to students of Telkom Vocational High School Malang and D3 English Study Program, State Polytechnic of Malang. With this application, students can learn English independently and utilize a rich collection of information and organized exercise items to get help or find more challenges whenever needed to avoid learning boredom.
Dynamic simulation model of salt supply chain to increase farmers income
Authors: Muhandhis I , Susanto H , Asfari U
Published: January 2020

The average national salt production is around 2.5 million tons per year has not been able to meet domestic salt demands. One of the factors that caused this was the low incentives received by farmers so that farmers were reluctant to carry out production in the following year. As the main actor in the national salt industry, farmer’s welfare needs to be considered to ensure the sustainability of salt production. This study aims to develop a dynamic model of the salt production supply chain by identifying internal and external factors that influence the system. We use system dynamic methods because this framework can model nonlinear equations among variables and can represent feedbacks loop relationships. From the base model simulation results, we developed a scenario to improve the welfare of salt farmers. By using the scenario of land intensification with filtering – threaded technology, geomembrane, and tunnel system, farmer’s profits could be increased up to Rp 13,830,300 per ha per season in the shortest dry season.
The effect of implementing E-cooperative on process speed, ease of operation, and cost efficiency
Authors: Purwokoaji D K , Rahmat C , Astiningrum M
Published: January 2020

The Industrial Revolution 4.0 in Indonesia is inevitable, and to deal with Society 5.0 which emphasizes excellent service equal to five stars, it is necessary to immediately implement information systems and information technology to the Indonesian people in general, so that government policies based on TOP-BOTTOM can be accelerated by incorporating a BOTTOM approach - UP The general method of this research is the study of literature, the design and analysis of systems and the implementation of empirical research in functional testing and user testing. The population was selected from cooperative members who had conducted online transactions totaling 268 people, and those who filled out and returned questionnaire entries totaling 172 people, the data was then processed using a structured equation model using the LISREL application. The result is that e-cooperative adoption affects process speed, ease of operation, and cost efficiency, both in partial and multiple correlations.
Development of decision support system for subsidized electricity purchase using Naive Bayes method to improve company reputation (Case study in PT. PLN (Persero) Malang)
Authors: Nurtjahjani F , Basuki R S , Pribadi J D , Batubulan K S , Suryadi S B
Published: January 2020

Nowadays there are a lot of customers who are categorized as capable households (Rumah Tangga Mampu). The problem is, electricity rates increased to IDR 1,352,00/KWH for customers with average capacity (900 Volt Ampere). Central government spending the proportion of electricity subsidies tends to rocketed up from 2.5% in 2005 to 4.7% in 2012 APBN. For average electricity subsidies consume around 7% of central government spending. This condition shows that electricity subsidies are quite burdensome to the central government budget (Biro Analisa Anggaran dan Pelaksanaan APBN-Sekjen DPR-RI). Problems related to electricity consumed for the national industry gives impact on fluctuations in subsidies and inefficiencies at PT PLN require a comprehensive solution. In implementing the electricity subsidy distribution program that is right on target and foster the performance of PT. PLN in charge, it is necessary to hold a new breakthrough based on technology by creating a systemized system for new registration and re-registration for electricity consumers by bringing the data that has been determined by PT PLN. Next, the consumers will be trained to accessthe system to determine whether the consumer is eligible for subsidies or not. To overcome the problem the system is proposed the solution through the implementation of Naive Bayes. Based on the result, the system is feasible tocategorizefor whom the customer get subsidized electricity rate or not. The precise objectives and the system are able to improve the accuracy in selecting consumer tariff subsidy of electricity to the consumer the right target for PT PLN.
Forecasting the number of Politeknik Negeri Malang new student’s enrolment using single exponential smoothing method
Authors: Amalia E L , Wibowo D W , Ulfa F , Ikawati D S E
Published: January 2020

Forecasting the number of new student enrolments at Politeknik Negeri Malang offers the campus a good help to discover new innovations and good marketing strategies. Besides, it can be used as a reference in planning the teaching and learning process. This study used the Single Exponential Smoothing method as a forecasting method. Forecasting accuracy uses Mean Absolute Deviation (MAD), Mean Square Error (MSE), and Mean Absolute Percentage Error (MAPE). Based on the calculation results, the smoothing constant result is α = 0.9 which means it has the smallest error values for the three forecasting accuracy calculation methods.
Passenger volume forecasting information system for PT. KAI Daop 2 Bandung using double exponential smoothing method
Authors: Amalia E L , Harijanto B , Santoso A
Published: January 2020

Daop 2 Bandung is one of the Indonesian railroad operations areas, under the administration of PT Kereta Api Indonesia (Persero). Daop 2 Bandung is currently experiencing a problem in predicting the number of passenger volumes. It is common for railway transportation services to experience passengers flows that increases or decreases in the volume which in turn causes the service of the PT. KAI becomes less optimum. Therefore, a forecasting information system is needed to forecast the volume of train passengers in the upcoming period. This study applied Double Exponential Smoothing method as a forecasting method. The data used is the number of passenger volume data for two periods, i.e. 2017 and 2018 periods. For forecasting accuracy, PE (Percentage Error) and MAPE (Mean Absolute Percentage Error) were used. The passenger volume forecasting results on the Executive Class category shows 946,824 with an error percentage of 11.9962%, the Business Class category shows 221,188 results with an error percentage of 21.6714%, and the Economy Class category shows 5,144,074 with an error percentage of 10.4366%.
The effect of distance Base Transceiver Station (BTS) on speed of vehicle safety response based on internet of things
Authors: Martawati M E , Rohman F , Kurniawan H F D , Abidin I N
Published: January 2020

In 2018 the Central of Statistics recorded cases of theft of motorized vehicles and embezzled cars from rentals totalling 2.752 cases, this was due to inadequate safety systems on the vehicle, and there were also several vehicles from vehicle rental services that had used GPS technology (Global Positioning System) which is integrated with the SMS gateway system (Short Message Service) to control the vehicle remotely, but in that system it has many disadvantages such as low speed of time response to turning off the vehicle and requires a large microcontroller memory because it has to store SMS messages and requires resetting in a certain period. The purpose of the study is to build a system in real-time by utilizing the latest technology, namely the Internet of Things so that vehicle owners can easily monitor and control their vehicles through the internet. The method of data analysis uses Anova two-way factor without replication. Data retrieval is done by varying the distance of the BTS and the type of provider to determine the accuracy and speed of response of the vehicle. The result of the study shows that Ublox neo 6M GPS can detect more accurately with Telkomsel Simpati providers with an average distance of 7,6184 meters and for the speed of response of vehicle control remotely Telkomsel Simpati provider with an average of 1,3334 seconds faster and stable.
The effect of pH upon corrosion rate of aircraft component type MD 80 on fuselage part
Authors: Suhartaya N U C , Rochmadi R
Published: January 2020

Indonesia as one of the archipelagic countries with 16,055 islands and has been registered with PBB certainly requires transportation facilities that can reach all areas of the country. The most efficient and effective mode of transportation to reach all islands in Indonesia is aircraft. Along with the increasing number of users it will increase the number of requests in the level of comfort and safety of passengers one of which is in the feasibility of an aircraft. This research aims to study the effect of pH upon corrosion rate of aircraft metal material type of MD 80 on fuselage part. This study employed pH at 3.4; 3.8; 4.4; 4.8; 5.4; 5.8; 6.1; 7.5; and 12 at fixed temperature of 30°C. Weight loss of aircraft metal material were measured once every 1 hour. The results of this study conclude that the effect of pH upon corrosion rate of aircraft type MD 80 metal material on the fuselage part at a fixed temperature of 30°C in a span of 12 hours showed less significant results. This might be due to the corrosion rate of aircraft metal components running very slowly so that in the span of 12 hours, no significant results were obtained.
Design of permanent magnet motor
Authors: Susilo S H , Jannah Z , Mustofa L D , Effendhi Y
Published: January 2020

The increasing energy demand is in line with population growth as well as the development of science and technology, and the maximum utilization of energy derived from magnets. The purpose of this research is to design of permanent magnet motor that produces rotation that can be utilized as power plant propulsion, without using fuel oil. The method used is to examine and search the gap of existing patent design and develop it in the form of a new design, In the hope of increasing the potential of magnetic energy into a magnetic power plant. By designing the magnetic position and angle of attack on the rotor and stator motor magnet.
Numerical studies on furnace water walls failure in water tube boiler applications
Authors: Zainuri A M , Patma T S , Setiawan A
Published: January 2020

Boiler as one of the main equipment in steam power plant system that has important function as steam generation for rotating turbine. Failure of boiler result in operational cause lowering the power capacity of the steam power plant system on the whole. From the data observation, boiler failure frequencies because of leakage on boiler tubes. To analyze the boiler tube failure accurately, information of temperature operated on the outer surface tube and temperature distribution on the furnace wall are needed. The main objective of this study is to investigate several areas in which the failure of furnace water walls boiler exists. A combined analysis of thermal and strength of material has been performed, in order to calculate the temperature and velocity fields inside furnace of the water tube boiler. Due to the geometrical complexity of the model, GAMBIT applications was used to generate a computer-based model. All numerical calculations have been performed using the commercial CFD package FLUENT. The results obtained were numerically that failure on furnace water walls in water tube boiler because there is localized overheating.
Simulation study of Savonius tandem blade wind turbine using an adjustable deflector
Authors: Adiwidodo S , Wahyudi B , Yudiyanto E , Subagiyo S , Hartono M , Baananto F
Published: January 2020

The conventional Savonius wind turbine has two inverted cylindrical blades, it can indeed receive fluid impulses from all horizontal directions and produce a greater drag force than other wind turbines. The weakness of Savonius is the resistance in one blade side. Efforts to improve that has been done is to add a blade that serves to increase the local velocity of fluid flow to resist the resistance which is termed Savonius tandem blade (STB). This research was conducted to further reduce the resistance value of one side STB with the addition of an adjustable deflector. The purpose of this study is to obtain information on changes in the torque of the STB wind turbine on variations in the deflector angle and stream velocity. The research method used is numerical simulation using CFD software. A two-dimensional view of the rotor model using deflector was considered. The deflector angle varies start from 15 degrees with an increase also every 15 degrees until the torque decreased. The CFD simulation show there is a significant increase in torque with the addition of a deflector. Maximum torque is not achieved at one deflector angle value but is also influenced by stream velocity. At higher stream velocity there is a tendency to reach the maximum torque required larger deflector angle. Then at a certain point, the torque will decrease when the deflector angle is enlarged.