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INTEK: Jurnal Penelitian
Published by Politeknik Negeri Ujung Pandang
ISSN : 23390700     EISSN : 26155427     DOI : -
Core Subject : Science, Engineering,
Computer Science & IT Engineering
INTEK is a journal managed by the Journal and Publication Development Unit of Ujung Pandang State Polytechnic, which is published twice a year, in April and October. The journal INTEK has also been indexed. The INTEK Journal accepts research scripts in the fields of technology and engineering such as: Electrical, Mechanical, Civil and Chemical Engineering.
Arjuna Subject : Umum - Umum
Articles 211 Documents
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Inrush Current Based on Fast Fourier Transform Zamzami, Mochamad Ilham; Prasetyono, Eka; Anggriawan, Dimas Okky; Yuliana, Mike
INTEK: Jurnal Penelitian Vol 8 No 2 (2021): October 2021
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v8i2.2940

Abstract

Advances in technology have caused the use of electricity to increase rapidly. With advances in technology, this is followed by the use of increasingly efficient electrical components or equipment. This more efficient electrical equipment causes the impedance of the component to be smaller, causing a surge in current when it is turned on. This current surge, if not followed by appropriate safety precautions, will be damage other components. Each load has different waveform characteristics and current transient peaks. For this reason, it is necessary to analyze the transient condition of a load to overcome this. This paper will explain the characteristics of the inrush current of the load due to ignition. There are three loads used in this study, namely resistive, capacitive and inductive loads. Then the use of this load is simulated by giving different ignition angle values, namely 0, 60, and 90 degrees. The analysis used is the Fast Fourier Transform (FFT) method which is a derivative of the Discrete Fourier Transform. The inrush current spectrum in this simulation is simulated using Simulink MATLAB with switching system modeling using TRIAC. This inrush current simulation data collection uses a sampling frequency of 100 Khz and will be analyzed in the first of 5 cycles. For each load in this paper, the harmonic values for each ignition angle will be presented. The simulation results show that the inrush current is caused by the ignition angle value used and because of components that can deviate energy such as inductors and capacitors as well as components which at the time of starting have a low impedance value such as incandescent lamps. The simulation also shows that the use of switching components for setting the ignition angle causes an increase in the value of Total Harmonic Distortion (THD) but the peak current in the first cycle when the ignition angle is set decreases.
Hydrological Analysis In Selecting Flood Discharge Method In Watershed Of Kelara River Mustamin, Muhammad Rifaldi; Maricar, Farouk; Karamma, Riswal
INTEK: Jurnal Penelitian Vol 8 No 2 (2021): October 2021
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v8i2.2874

Abstract

For Engineers involved in planning and construction of water resources building, hydrology becomes very important data. In terms of planning stage in water resources especially waterworks, it is known that design flood discharge closed to field realistic conditions is often needed in order that a planned construction is able to control flood discharge. Several previous researches in choosing flood discharge selection method have diverse depending on observed watershed. One method in determining selected flood discharge by verification using Creager diagram, by comparing discharge calculation results of several Synthetic Unit Hydrograph (SUH) with infrastructure flood discharge (AWLR result) in observation point. This research aims to obtain  the most suitable synthetic unit hydrograph and close to analysis result of measured discharge frequency, and Creager diagram in Kelara watershed (DAS). Based on the calculation of design flood discharge according to rainfall data using synthetic unit hydrograph of Nakayasu, ITB I, ITB II, and SCS (HEC-HMS) as well as the calculation of design flood discharge according to collected data, it is concluded that the synthetic unit hydrograph method closest to design flood discharge with measured discharge rate and Q1000 rate of Creager diagram is SCS. Flood discharge rate obtained according to HSS SCS method using HEC-HMS  4.8 application in period of 2 years  is 658,40 m3/s, 25 years is 682,70 m3/s, 50 years is 787,00 m3/s, 100 years is 885,70 m3/det, and 1000 years is 1202,60 m3/s
Implementation of Gamification in The Hotel Membership System for Repurchase Anwar, Toni; Wijaya, Anugerah Bagus; Paramita, Cayadewi; Fathoni, Muhamad Zidan
INTEK: Jurnal Penelitian Vol 8 No 2 (2021): October 2021
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v8i2.3357

Abstract

Javaheritage Hotel is a 4-star hotel located in the tourist city of Purwokerto. Java Heritage already has a membership system to increase consumers’ purchases back to the hotel. The current membership system allows consumers to purchase members who will get an active stay voucher for one year. Javaheritage requires increasing the number of repurchases by member and non-member consumers to Javaheritage hotels. Gamification applies scoring points, competition, and game rules to other activities or activities. This study aims to design a hotel membership system that implements gamification to increase repurchase at java heritage hotels. The output of this research is a research journal, and the TKT that will be achieved is at level 7. Namely, the Demonstration of a prototype system in a natural environment. The development method used is RAD (Rapid Application Development) and system design depiction using UML.
Handling Water Leaking on The Turbine Pit ULPLTA Bakaru due to Damage of the Guide Vane Part using Automatic Method with Motorized Valve Ardhianto, Mochamad Marte; Sumarwanto, Rudi
INTEK: Jurnal Penelitian Vol 8 No 2 (2021): October 2021
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v8i2.2994

Abstract

The Bakaru PLTA is the largest hydroelectric power plant in South Sulawesi with a capacity of 126 MW. To generate that much power, a lot of water is required, therefore, the Bakaru hydropower dam is designed to be able to accommodate a lot of water. In operation, the Bakaru hydropower plant consists of 2 units. However, not all units operate normally, such as unit 2. In unit 2, there is a leak that occurs in the Turbine Pit. This leak is caused by abrasion of the u-packing guide vane. With a leak in the turbine pit, more approaches are needed to dispose of the water in the turbine pit to the pit drainage. Which later developed into an infusion system that utilizes gravity to discharge water from the turbine pit in basement 2 to the drainage pit in basement 3. However, in its development, it turns out that the volume of water discharged cannot be controlled so that, it can cause a condition where one day the infusion hose does not flow and causes an increase in the water level in the turbine pit. This rise in the level of the turbine pit is dangerous for the unit. This is because water can enter the breathing hole of the bearing turbine tank and contaminate the oil so the bearing temperature is high and causes a trip or in the worst case, causing equipment damage. However, in reality, using an infusion system using human labor is still often constrained in terms of time efficiency, consistency and cost. Because every time this activity is carried out, the workers who do it are not always the same person and scheduled. Therefore the efficiency is still low. The purpose of this study was to determine the optimal method of handling the increase in water level in the turbine pit so that unit trips do not occur caused by the increase in the water level in the turbine pit. Finally, it is interesting to discuss and find a solution by relocating the handling of leaks by "using an automatic method with a motorized valve by installing a Motorized Valve on the Turbine Pit, so there are financial and non-financial benefits to be obtained. From the results of using the automatic method with a motorized valve, the results obtained are faster cycle times for handling leaks in the turbine pit so there is no stop unit due to leakage disturbances in the turbine pit.
Design and Build Chatroom Application as Student Consultation Media Based on Android Bastian, Alvian; Solihin, Muhammad Affiq; Irdan, Anggi Amelia; Jalal, Novita Maulidya
INTEK: Jurnal Penelitian Vol 8 No 2 (2021): October 2021
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v8i2.2975

Abstract

To support the government’s program in preventing the spread of COVID-19 virus, it is expected to reduce direct communication between fellow students and lecturers. The purpose of this research to create interactive media that can provide consulting service for students with academic advisor (PA) without direct contact. It is expected for this research, students can be more proactive in interacting with their academic advisor in discussing academic and non-academic problems. The method used in this research is using Android Studio and Visual Studio Code as an Integrated Development Environment (IDE) and using a no-relational (NoSQL) realtime database on firebase. The advantage of this research is that the system to be developed does not use physical servers anymore but all databases are stored in the cloud system. The result of this research is chatroom application consisting of 7 modules namely application login with username and password, searching user, chatting user, list consultation, student input consultation, edit data consultation, and account setting.
Study on The Development of Pioneering Routes at Bua Airport Based on Multi Creteria Analysis Rauf, Irwan; Adisasmitha, Sakti Adjie; Hustim, Muralia
INTEK: Jurnal Penelitian Vol 9 No 1 (2022): April 2022
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v9i1.3399

Abstract

This study aims to analyze the characteristics of the pioneering route from Bua Airport to other airports in South Sulawesi Province and to analyze the selection of priority pioneer routes from Bua Airport based on multi-criteria analysis. This research is non-experimental and much more based on descriptive qualitative and quantitative. Collecting data process is by using observation, documentation, and questionnaires. The respondents of this study were 100 respondents consisting of the public/passengers, employees and leaders of Bua airport. In this study, the AHP method is needed to make a decision whether to develop pioneer routes at Bua airport by opening several pioneer routes to other areas. The results of pairwise comparisons look at the characteristics of the selection criteria for pioneering route development criteria for distance 24.0%, travel time criteria 24.9%, cost criteria 25.8%, transportation mode criteria 13.6% and road network criteria 11.6%, therefore, the priority criterion in developing the pioneer route for Bua Airport is the cost criterion with a weight of 25.8%. The selection of priority pioneer routes for Bua Airport in comparison of alternatives with alternatives based on the criteria for the main area distance is Toraja 32.3%, the criteria for travel time to the main area of Toraja 38.6%, the criteria for the cost of the main area of Seko 32.8%, the criteria for the main mode of transportation Toraja 32, 5% and the main regional road network criteria are Toraja 31.9%, the priority pioneer route development for Bua Airport is Toraja 33.2%, the second area is Seko 29.2%, the third area is Rampi 19.2%, the fourth area is Masamba 9.8%, and the fifth area is Kendari 8.5%.
Design of a Single Phase HERIC-SPWM Murdianto, Farid Dwi; Sudihato, Indhana; Karso, Anang Budi; Zulfa, Wildana
INTEK: Jurnal Penelitian Vol 9 No 1 (2022): April 2022
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v9i1.2995

Abstract

Development in the field of technology has experienced rapid development in recent years, especially in inverter. Every year the development of inverters is very fast starting from full bidge inverters to HERIC inverters, inverters are usually used to convert DC voltage to AC, HERIC inverters are modifications of full bidge inverters with 2 additional IGBTs on the output side, therefore this paper will discuss about inverter design. HERIC SPWM 1 phase.The HERIC inverter will be compared with full bridge inverters to find out the advantages of these modifications. The modulation technique here uses SPWM (sinusoidal pulse width modulation) modulation technique as the switching process. IGBT switching on the HERIC inverter to produce the desired output waveform. The methodology for making a 1-phase HERIC SPWM inverter using a source from the PLN road network which will then be rectified by the rectifier. The rectifier output of 311 vdc will then be converted into AC voltage with output by the HERIC inverter.So that by making this single-phase HERIC SPWM inverter it is possible to be efficient and produce the power supply that will be used.
CMS Wordpress Based Academic Information System Design at SMPN 17 Marusu Nahlah, Nahlah; Ruswandi Djalal, Muhammad
INTEK: Jurnal Penelitian Vol 9 No 1 (2022): April 2022
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v9i1.3383

Abstract

School is one of the formal education facilities that must be able to provide the best services or facilities for students and also for parents. One of the right ways is to use information technology, namely accessing academic values through websites. The specific objective of this research is to produce an academic information system based on Wordpress Content Management System (CMS) that can be used by SMPN 17 Marusu in Maros Regency. The current website-based academic information system is made using a complex programming language and requires special skills to create the website. Wordpress is a platform for creating websites instantly. In this study, the information system was built using the prototype method so that it can be adapted to user needs. The resulting software is presented to the user, starting from the requirements analysis, design to implementation stage, and users are given the opportunity to provide input so that the resulting software really fits the user's needs. The prototype method consists of several stages, namely, requirements analysis, system analysis, system design, system testing, and system implementation. The design stage includes interface design, front end and back end using WordPress CMS. With this school website, it is hoped that it can help government programs in improving school performance and productivity.
Senggani Fruit Anthocyanins (Melastoma Malabathricum Auct, Non Linn) As Bacterial Dyes Differential Painting Techniques Indrawati, Ratih; Ratnawati, Gervacia Jenny; Tumpuk, Sri
INTEK: Jurnal Penelitian Vol 9 No 1 (2022): April 2022
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v9i1.2987

Abstract

Bacteria are difficult to see with a light microscope, because they do not absorb or refract light. Dyes absorb and refract light so that the contrast of bacteria with their surroundings is enhanced. Anthocyanins are water-soluble pigments that are naturally found in various types of plants. As the name implies, this pigment gives color to flowers, fruits, and leaves of green plants.This research is a type of descriptive research. The treatment consisted of painting bacterial preparations with anthocyanin pigment extract of senggani fruit with 70% ethanol solvent and control with gram staining. The treatments were: T1: staining of bacterial preparations with gram staining, T2: painting of bacterial preparations with anthocyanin extract of senggani fruit added with 14% citric acid as a substitute for safranin and NH4Cl as a substitute for crystal violet. The results of the study showed that anthocyanin pigment extract was proven to be used as a dye for Staphylococcus aureus, Escereria coli as a substitute for synthetic dyes Safranin and Crystal violet in Gram staining.
IoT-Based Hydroponic Plant Monitoring and Control System to Maintain Plant Fertility Untoro, Meida Cahyo; Hidayah, Fathan Rizki
INTEK: Jurnal Penelitian Vol 9 No 1 (2022): April 2022
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v9i1.3407

Abstract

Hydroponics is a method of cultivating plants by utilizing a small amount of land without using soil media. Hydroponic cultivation is still done conventionally in monitoring and controlling nutrients and pH of the air. Hydroponics is already with Internet of Things (IoT) technology in the cultivation process. The research aims to use IoT technology by developing control devices and monitoring hydroponic plants remotely, to make it easier for cultivators to control and monitor plant color, temperature, nutrients and the pH value of hydroponic plant water. Control and monitoring can be done through a smartphone application. The data from testing the condition of hydroponic plants obtained an average error of 1.8% for air temperature, 4.8% for water pH, 6.6% for plant color and 7% for water nutrients. Hydroponic plants with the TCS3200 sensor get a monitoring opportunity of 53.3%. Testing of tool control related to nutritional improvement has been carried out using the fuzzy Mamdani method with an increase in the probability of 88.75% for adding nutritional value and 0% for decreasing nutritional value. Tool control for improving the pH value of hydroponic plant water has been successfully carried out.

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