bluuebunny/crossref_metadata_2025 huggingface dataset:
PENGEMBANGAN SMART FITTING BERBASIS IOT (INTERNET OF THINGS) DENGAN MENGGUNAKAN MIKROKONTROLER ESP 32 S
Authors: Kasim Muh Alief Anugerah , Ruslan Ruslan , Zain Satria Gunawan
Published: March 2022

Penelitian ini bertujuan untuk menghasilkan produk pengembangan Smart Fitting dengan menggunakan ESP 32 S sebagai sistem kontrol lampu, monitoring keadaan dan konsumsi daya listrik pada lampu dari jarak jauh dengan mengirimkan data secara realtime melalui aplikasi android yang terintegrasi dengan perangkat Smart Fitting. Penelitian dilakukan dengan menggunakan metode R&D (Research And Development) dan model pengembangan prototype. Prosedur pengembangan meliputi tahap analisis kebutuhan, desain dan rancangan sistem Smart Fitting, pembuatan prototype sistem, ujicoba dan tahap validasi. Dari hasil uji coba kontrol nyala lampu, memonitoring kondisi dan penggunaan listrik pada lampu mendapatkan nilai error sebesar 0% yang artinya alat dapat bekerja dengan baik dan akurat. Sedangkan nilai error untuk hasil pengujian monitoring nilai tegangan ialah 0,67 %, nilai error arus sebesar 0,009 %, besaran nilai error energi sebesar 0,027%,  nilai error frekwensi sebesar 0,051 %, besaran nilai error daya sebesar 0,44 % dan nilai error Power Factor sebesar 0,038 % angka ini didapatkan berdasarkan perbandingan antara hasil monitoring sistem Smart Fitting dengan hasil pengukuran pada alat ukur power meter KWE-PM01-EU.
Pengembangan Media Pembelajaran Interaktif Berbasis Android Pada Materi Konversi Bilangan Digital
Authors: Zulfikar Muhammad Ihsan , Mappeasse Muhammad Yusuf , Hasrul Hasrul
Published: March 2022

Penelitian ini bertujuan untuk (1) mengetahui hasil Pengembangan Media Pembelajaran Interaktif Berbasis Android pada Materi Konversi Bilangan Digital dan (2) untuk mengetahui tanggapan pengguna terhadap Media Pembelajaran Interaktif Berbasis Android pada Materi Konversi Bilangan Digital. Penelitian ini adalah penelitian Research and Development dengan model pengembangan 4D. Tahapan proses penelitian ini antara lain: tahap Define; tahap Design; dan tahap Develop. Teknik analisis data yang digunakan adalah analisis deskriptif kuantitatif. Subjek penelitian adalah Mahasiswa dari Fakultas Teknik Universitas Negeri Makassar. Validasi ahli meliputi validasi yang dilakukan oleh delapan orang ahli yang meliputi aspek instrumen penelitian, aspek media, aspek program, dan aspek materi. Berdasarkan hasil penelitian yang telah dilakukan, maka dapat disimpulkan bahwa: (1) berdasarkan saran-saran dan hasil penilaian para ahli serta pengujian yang dilakukan kepada subjek/ sasaran penelitian, maka dihasilkan sebuah produk akhir Media Pembelajaran Interaktif Berbasis Android pada Materi Konversi Bilangan Digital. (2) Hasil tanggapan pengguna terhadap media yang dikembangkan, dapat disimpulkan bahwa: berdasarkan uji coba one to one, media dinyatakan baik; berdasarkan uji coba kelompok kecil, media dinyatakan sangat baik; berdasarkan uji coba diperluas, media dinyatakan sangat baik.
PENGARUH PEMELIHARAAN JARINGAN DISTRIBUSI SALURAN UDARA TEGANGAN TERHADAP KEANDALAN JARINGAN DISTRIBUSI DI WILAYAH PT. PLN (PERSERO) ULP KALUMPANG AREA BULUKUMBA
Authors: Massikki Massikki , Firdaus Firdaus , Angrini Indah Putri
Published: March 2022

Penelitian ini bertujuan untuk mengetahui: (1) frekuensi pemeliharaan yang dilakukan pada jaringan distribusi saluran udara tegangan menengah (2) nilai indeks keandalan jaringan distribusi dan (3) pengaruh pemeliharaan jaringan distribusi saluran udara tegangan menengah terhadap keandalan jaringan distribusi di PT. PLN (Persero) ULP Kalumpang Area Bulukumba. Penelitian ini merupakan jenis penelitian kuantitatif dengan analisis statistik regresi linear sederhana. Data penelitian diperoleh dengan teknik wawancara dan dokumentasi. Hasil penelitian menunjukkan bahwa frekuensi pemeliharaan jaringan distribusi saluran udara tegangan menengah yang dilakukan di PT. PLN (Persero) ULP Kalumpang Area Bulukumba dalam 3 tahun terakhir sebanyak 720 kali, pemeliharaan preventif dan 118 kali pemeliharaan korektif. Indeks keandalan jaringan distribusi di wilayah PT. PLN (Persero) ULP Kalumpang Area Bulukumba dalam 3 tahun terakhir sebesar 1,58 kali/tahun untuk SAIFI, 2,99 jam/tahun untuk SAIDI, 1,48 jam/pelanggan untuk CAIDI pada tahun 2019, sebesar 1,35 kali/tahun untuk SAIFI, 2,13 jam/tahun untuk SAIDI, 1,47 jam/tahun untuk CAIDI pada tahun 2020, sebesar 1,87 kali/tahun untuk SAIFI, 1,88 jam/tahun untuk SAIDI, 0,94 jam/pelanggan untuk CAIDI pada tahun 2021. Hasil analisis regresi linear menunjukkan bahwa terdapat pengaruh signifikan antara pemeliharaan jaringan distribusi saluran udara tegangan menengah terhadap keandalan jaringan distribusi di PT. PLN (Persero) ULP Kalumpang Area Bulukumba.
PENERAPAN TEKNOLOGI INTERNET OF THING (IoT) PADA BISNIS BUDIDAYA TANAMAN HIDROPONIK DI KECAMATAN PALLANGGA KABUPATEN GOWA
Authors: Zulhajji Zulhajji , Mangesa Riana Tangkin , Karen Karolus
Published: March 2022

Penelitian ini adalah penelitian Research and Development (R & D) yang bertujuan untuk mengembangkan hasil dari pengembangan teknologi IoT pada budidaya tanaman hidroponik, serta untuk mengetahui bagaimana tanggapan dari hasil penerapan teknologi IoT di Tirta Tani Farm. Berdasarkan hasil dari penelitian diperoleh sebuah alat dan aplikasi hydroponic monitoring system berbasis teknologi IoT di Tirta Tani Farm, untuk memonitoring kondisi tanaman hidroponik dari jarak jauh dengan mengirimkan data secara realtime melalui aplikasi android yang terintergrasi dengan perangkat hydroponic monitoring system. Selanjutnya pengujian alat dan aplikasi ini diuji coba dan dibagi menjadi dua metode yaitu pengujian functionality dan usability, Pengujian functionality terdiri dari blackbox dan pengujian usability terdiri dari kuesioner atau angket. Hasil dari pengujian functionality diperoleh bahwa fungsi yang terdapat pada alat hydroponic monitoring system ini berfungsi dengan baik kemudian hasil pengujian yang dilakukan oleh dua validator yaitu mendapatkan skor persentase 100%. Dan hasil dari pengujian usability yang dilihat dari implementasi aplikasi hydroponic monitoring system diperoleh bahwa hasil secara keseluruhan pendapat responden terhadap penggunaan apikasi mendapatkan hasil efektivitas aplikasi dengan skor persentase 82,22%, bisa disimpulkan bahwa alat ini dapat diterima dan aplikasi yang dikembangkan sangat baik untuk diterapkan pada Tirta Tani Farm.
PENGEMBANGAN MODUL ELEKTRONIKA ANALOG DAN DIGITAL MENGGUNAKAN AUGEMNETED REALITY
Authors: Jumriah Titin , Lamada Mustari S , Parenreng Jumadi M
Published: March 2022

Penelitian ini bertujuan untuk mengetahui (1) hasil pengembangan modul elektronika analog dan digital menggunakan augmented reality, (2) kelayakan modul elektronika analog dan digital menggunakan augmented reality, (3) kepraktisan modul elektronika analog dan digital menggunakan augmented reality. Model pengembangan yang digunakan pada penelitian ini mengacu pada model pengembangan ADDIE yang terdiri dari 5 tahap, yaitu (1) analyze (analisis), (2) design (perancangan), (3) develop (pengembangan), (4) implement (implementasi), dan (5) evaluate (evaluasi). Subjek uji coba desain produk adalah ahli materi/konten, sedangkan subjek uji coba produk adalah mahasiswa Program Studi Pendidikan Teknik Elektro berjumlah 3 mahasiswa untuk uji coba one to one,  10 orang untuk uji coba kelompok kecil dan 37 orang untuk uji coba lapangan. Penelitian ini menggunakan instrumen pengumpulan data yaitu, wawancara, angket/kuesioner dan dokumentasi, kemudian dinalaisis data kevalidan instrumen, kelayakan dan kepraktisan modul elektronika analog dan digital. Hasil menunjukkan bahwa (1) pengembangan modul elektronika analog dan digital mengacu pada model pengembangan ADDIE. (2) kelayakan modul elektronika analog dan digital dinyatakan layak dengan tingkat presentasi 94% dan termasuk kategori sangat baik berdasarkan pengujian ahli. (3) kepraktisan modul elektronika analog dan digital dinyatakan cukup praktis berdasarkan olah data dengan presentasi 90% sehingga dinyatakan sangat praktis berdasarkan uji coba lapangan
PENGEMBANGAN WIRELESS SENSOR NETWORK PADA KOMUNIKASI SMART POWER METER
Authors: Sari Musdalipa , Hasrul Hasrul , Muliadi Muliadi
Published: March 2022

Penggunaan listrik adalah elemen yang sangat penting dalam kehidupan bermasyarakat, baik dalam rumah tangga, penerangan, komunikasi, industri dan sebagainya. Tenaga listrik merupakan salah satu faktor penting penunjang pembangunan, khususnya di bidang industri. Kehidupan modern menjadikan energi listrik sebagai elemen mutlak yang harus tersedia. Oleh karena itu, ketersediaan energi listrik harus terus terjamin. Upaya yang dapat dilakukan dengan pengendalian penggunaan energi listrik pada sisi hulu yaitu konsumsi (konsumen). Berdasarkan pertimbangan di atas, peneliti mengembangkan smart grid menggunakan sistem smart metering. Smart Power Meter ini bertujuan untuk menjadi sistem yang menggunakan teknologi IoT untuk memantau konsumsi daya dan mengontrol peralatan  rumah  secara real time. Penelitian ini merupakan penelitian dan pengembangan (R&D) yang bertujuan untuk mengembangkan prototipe jaringan sensor nirkabel untuk berkomunikasi dengan smart power meter dan menguji hasil prototipe jaringan sensor nirkabel untuk berkomunikasi dengan smart power meter. Penelitian ini menggunakan model pengembangan prototipe yang meliputi tahapan analisis kebutuhan, perancangan prototipe, pengembangan prototipe, dan pengujian prototipe. Data survei diperoleh melalui teknologi pengukuran dan kuesioner. Berdasarkan temuan tersebut, kami membuat prototipe jaringan sensor nirkabel untuk komunikasi smart power meter untuk memantau konsumsi daya listrik dan mengontrol perangkat listrik dengan smartphone berbasis Android. Hasil uji prototipe mencapai hasil yang sangat baik.
Pengukuran Kedalaman dan Koordinat Jalan Berlubang Menggunakan Sensor Ultrasonik dan GPS Berbasis Internet Of Things (IoT)
Authors: Rosyady Phisca Aditya , Fajeri Fadil , Agustian Muhammad Andika
Published: March 2022

The development of the world of transportation in Indonesia is growing very rapidly, especially in the field of land transportation. This can be seen from the number of motorized vehicles, both cars, and motorcycles in Indonesia, which continues to increase from year to year. According to data from Badan Pusat Statistik (BPS), the number of motorized vehicles reached 126,508,776 units, the data increased 5.9 percent from the previous year 2017 wherein that year the number of motorized vehicles was 118,922,708 units. The problem that still often occurs for land transportation infrastructure is that there are still many damaged roads such as potholes, so prevention is needed by recording road damage data such as the depth of holes during manual recording, so in this study, we discuss how to measure these holes using ultrasonic sensors. integrated with GPS data to record the location of potholes. The result is that the measurement error using ultrasonic is 4.9 %. Meanwhile, for the results of testing the GPS data, the error in latitude data is 0.00061 %, the data for longitude error is 0.00004 %..
Penentuan Koreksi Sudut Attitude pada Quadrotor Menggunakan Algoritma Zero Acceleration Compensation
Authors: Avisena Shandy , Kurniawan Freddy , Purnami Ndaru Atmi
Published: March 2022

The orientation angle of a quadrotor UAV can be estimated from gyroscope and accelerometer data. Orientation can be predicted from gyroscope data under static or dynamic conditions, but the predicted value has accumulated errors. Meanwhile, orientation can also be calculated from accelerometer data, but only correct if the sensor is in a static state. To get a more precise orientation angle, the orientation predicted from the gyroscope data and the orientation calculated from the accelerometer data were fused using a Kalman filter. Determination of the condition of the sensor using a threshold value that is applied to the covariance of the acceleration data. in this study, the zero-acceleration compensation algorithm is used so that when the sensor is static, the orientation angle is calculated from the accelerometer. The use of this algorithm can increase the accuracy of the quadrotor orientation for roll angle to 96.84% and pitch angle to 98.91%.
Studi Potensi dan Perencanaan Pembangkit Listrik Tenaga Mikro Hidro Di Bendung Simbang Kecamatan Doro Kabupaten Pekalongan
Authors: Abdillah M. Fanis , Gunawan Gunawan , Suprajitno Agus
Published: March 2022

The impact of greenhouse gas emissions is getting higher due to the use of fossil energy to drive power plants. Efforts to replace it is to develop renewable energy that is popular in Indonesia is micro hydro technology. This study aims to determine the potential of water energy and plant planning at Simbang Weir in Pekalongan. The method used combines water flow measurements with floating techniques and uses geographic information provided by Google Earth. The result of this research is that the water discharge is measured at 3.67 m3/s with a height of 11 meters. The turbine design uses crossflow with a potential power of 280.11 kW. The detailed engineering design is described in full in this study.
Pengembangan Sistem Pemantau Kebocoran Gas Elpiji dan Peringatan Dini Bahaya Kebakaran Berbasis Internet of Things
Authors: Husny Husny , Kurniawan Freddy , Lasmadi Lasmadi
Published: March 2022

The fire hazard due to an LPG cylinder explosion can be triggered from a gas cylinder leak. Not infrequently these incidents lead to loss of life and property loss. This study proposes the design of an LPG gas leak monitoring system and early warning of fire hazards. The system is designed to be integrated with the internet network through the Internet of Things (IoT) platform. The MQ-6 sensor module is used to detect LPG gas leaks and a fire sensor to detect fire. The sensor is installed close to the gas outlet source to ensure gas leakage and fire. The data from the sensor is read by the microprocessor and sent to the web server via the interface device. When the concentration of LPG gas in the air exceeds a certain level or a fire is detected, the microprocessor gives a command to turn on the alarm and sends a hazard notification to the smartphone. Hazard notifications, gas concentrations and status of hazard conditions can be accessed in real-time on Android-based smartphones. The results of the tests that have been carried out show that this system can provide information on hazard notification messages and gas concentration values in the range of 1000 - 10000 ppm. The fire detector in this system can detect fires up to a distance of 110 cm from the source of the fire. Then, hazard notifications and gas concentration levels can be accessed via a smartphone with the Kodular web application in the form of a real-time graphic display.
Analisis Tinjauan Ekonomi Teknis dalam Pemasangan Kapasitor Bank untuk Memperbaiki Nilai Faktor Daya pada Beban Industri
Authors: Pambudi Prastyono Eko , Kristiyana Samuel , Suyanto Muhammad , F Maulana Maliq , Rahmadi Diky
Published: March 2022

Industry is one of the largest users of reactive power in the distribution of electric power. Industries use equipment such as induction motors, transformers and other equipment to support their production needs. Loads such as induction motors are inductive loads that require reactive power to operate. Reactive power in an electric power distribution network is a loss. Reactive power can reduce the effectiveness of the real power which is converted into active power so that the efficiency of real power usage is reduced. Installing a capacitor bank is one way to compensate for the use of reactive power in a load. Installing capacitor banks aims to improve the value of the power factor that has decreased due to the use of excessive reactive power loads. PLN has set a standard power factor value for consumers of 0.85 and reactive power consumption of 0.62 of the total power consumption. For this reason, it is necessary to carry out further analysis regarding the advantages and disadvantages of installing bank capacitors to improve the value of the power factor so that the ideal economic factor for consumers is obtained.
Radio Transmission Detection Using Doppler in UHF Frequency Band
Authors: Sudibya Bambang , Dermawan Denny , Purnomo Muhammad Jalu , Irawaty Mardiana
Published: March 2022

The direction finder of a radio transmitter is a device that functions to find and determine the direction of a radio transmitter that works in the Ultra High Frequency (UHF) band. UHF frequency used is in the range of 420 - 440 MHz. The concept of Doppler radio is used as a method to determine the direction a radio transmitter is located. Radio Doppler use four receiving antennas which are installed at a certain distance so that it can produce a difference in frequency (Doppler) on each radio antenna because of the difference in the angle of the detected signal. The direction of the incoming signal will be displayed on a set of 16 LEDs and each LED will represent the direction of the incoming angle of 22.5 degrees. The detected frequencies are 422,580 MHz and 429,980 MHz originating from the UHF transmitter with 100mW of power and amplified with a radio frequency amplifier of 3 Watts power. The results show that the frequency of 429,980 MHz was detected with a maximum detectable distance of 1500 meters. The frequency of 422,580 can be detected with a maximum distance of 800 meters. This radio direction finder is can be used to find radio signal in UHF band frequency 420-440 MHz. The direction of the radio transmitter location is simply show in group of led’s as a direction detector.
Implementasi Sistem Data Logger pada Alat Pemantau Energi Listrik Motor Induksi 3-Fasa Berbasis Arduino Mega 2560 di PT Madu Baru Yogyakarta
Authors: Firman Beny , Santoso Hariyo , Priyambodo Sigit , Suseno Hadi Prasetyo , Pambudi Prastyono Eko , Kusumaningsih RR Yuliana Rachmawati
Published: March 2022

An Induction motor is an electric machine that converts electrical energy into kinetics energy and widely used in the industrial fields. Many disturbances that occur in the motor that cause production to be not optimal as for the problems that occur at PT. Madu Baru Yogyakarta is when there is a disturbance in the three-phase induction motor, workers still use manual methods to analyze the disturbance, so that the time used in the analysis takes a long time even the three-phase induction motor cannot work again. In overcoming this, it is necessary to implement a data logger system that can detect the electrical parameters of a three-phase induction motor in real time, in order to make it easier to analyze existing disturbances through graphs. The voltage sensor CYVS13-34U0 and current sensor SCT-019 will detect the electrical parameters which will then be processed by the Arduino Mega 2560 pro so that the processed data will be stored on the microsd card. The data resulting from the processing are electrical parameters in the form of voltage, current, apparent power, real power, reactive power, and power factor. The data will be saved as a file with .txt format which has an interval of about 1 minute for each storage.
Rancang Bangun Solar Power Meter berbasis Arduino Uno dengan Data Logger untuk Pengukuran Insolasi dan Iradiasi Sinar Matahari
Authors: Kiswanto Aris , Rachmad Hanif Caesar , Solichan Achmad , Saptadi Arief Hendra , Mariani Dina , Prasetyo Moh Toni
Published: March 2022

In  planning  the  installation  of  solar  panels  at  a  location,  it  is  necessary  to  have  solar irradiance data at that location.  Solar  irradiance  data  is  obtained  through  direct measurements using a solar irradiance meter. Solar irradiance measuring  instruments  usually  use  one  of  three  types  of sensors,  including  thermopile  (pyranometer),  solar  cells,  or photodiodes.  Each  has  advantages  and  disadvantages.  The advantages of solar cell sensors are that they have a faster response to sunlight, are more in line with the production of energy produced by solar panels and have a more economical price compared to other sensors. Solar irradiance is directly proportional to the short-circuit current of the solar cell. The aim of this research is to design an Arduino Uno-based device to measure the insolation and irradiance of sunlight, equipped with a data logger to support data analysis. The solar power meter is designed using a solar cell reference with a short circuit current of 455 mA. The microcontroller board used is Arduino UNO ATmega328 while the current sensor used is WCS2801 with a sensitivity of 2mA/mV. Irradiation, current  and  insolation  data  are  recorded  and  stored  every minute using a datalogger to SD card with a capacity of 16 GB. the  average  of  %  error  when  testing  the  comparison  of readings with photodiode-based solar power meter is 1.747%. The highest point of sun insolation is 5.56.kWh/m2 during three-day period of data logging and it is achieved when solar cell is positioned horizontally on the terrace.
Distribusi Pergerakan Penumpang Pesawat Udara Di Pulau Jawa Menggunakan Model Furness
Authors: Gunawan Gunawan , Setiabudi Dedet Hermawan , Utomo Bagus Wahyu
Published: March 2022

The movement needs that always increases will cause some problems, especially people are heading to the same destination of the certain area at the same time. To reduce the problems caused by the increase in the number of movements, it is necessary to analyze the future distribution of aircraft passenger movements. The research model is the distribution of aircraft passenger movements in Java Island using the Furness model. In this case, it is found that the Furness model is the best method because have a standard deviation and mean absolute percentage error to the smallest. It could be concluded that the Furness model is more accurate when compared to the Gravity Model (DGCR) with tanner obstacle function in estimating the distribution of movements in 2025 in Java Island
RELIABILITY ANALYSIS OF MAIN ROTOR EC 155B1 ON PIN BLADE AND ATTACH BEAMS COMPONENTS USING MARKOV ANALYSIS
Authors: Aditiya Irvan , Pinandhita Lazuardy Rahendra , Adiputra Bangga Dirgantara
Published: March 2022

Reliability is used to estimate the conditions of systems or components in the future based on previous conditions. The objects of this research are EC 155B1 aircrafts owned by Indonesia Air Transport & Infrastrucure (IAT), and the method used for analysis is markov analysis. Markov analysis is widely used as an analyzing technique the states of the system that has limited information (memoryless). From this research, ATA chapter 62 Main Rotor that meets the requirements of reliability analysis. The constituent components of main rotor states are Pin Blade, Lower Attach Beam, and Upper Attach Beam. The results of the markov analysis of main rotor system, the states that worked properly are state 1, state 3, and state 4. The probability of the state 1 showed that state has decreased from initial condition, while the state 3 and state 4 have increased from initial condition and subsequently have decreased. The reliability of main rotor system has decreased along with increasing of flight hours with the Mean Time To Failure (MTTF) is 2340.22 flight hours.
CASE ANALYSIS ON FLIGHT CONTROL SYSTEM SIKORSKY S76 C++ FAILURE FROM YAW CONTROL ASPECT
Authors: Rahmawati Fajar Khanif , Lukito Indro , Baihaqi M Imam
Published: March 2022

Flight Control is a system that functions as a helicopter control center. Failure that occurs in flight control would certainly result inconvenience of the pilot in operating the helicopter, even the movement of the helicopter can out of control causing incident or accident. The continuity of the helicopter operation is affected by the maintenance system applied. One of mode moving system helicopter is yaw control, that could control the nose helicopter to move right and left. Fault Tree Diagram could described  analytical technique, whereby an undesired state of the system is specified (usually a state that is critical from a safety or reliability standpoint). The system then analyzed in the context of its environment and operation to find the solution. Based on the analysis results of failures that occurred in the Sikorsky S76 C ++ helicopter flight control from yaw control aspect in the period of January 2015 to May 2018 with an average use of helicopter’s 2092.05 flight hours, there were 46 failures which caused by yaw control. Based on diagram, there were 4 basic events which caused unschedule maintenance on Sikorsky S76 C ++ helicopter flight control system because of yaw fail control,  so that a replacement or repair was needed for the components that affected to the system failure.
AERODYNAMIC ANALYSIS OF SPORT UTILITY VEHICLE (SUV) BY COMPUTATIONAL FLUID DYNAMICS (CFD) APROACH
Authors: Junaidin Buyung
Published: March 2022

The main purpose of aerodynamics analysis of a vehicle is optimizing it’s form to increase aerodynamics efficiency. More streamline of aerodynamic design of a vehicle not just effecting to lower fuel consumption which is cause by lower drag due to wind at highspeed, but also increasing stability dan control of the vehicle itself. The vehicles are existed with many variations of form so they have difference aerodynamic characteristics. For a personal vehicle like cars, have many variants such as sedan, sport utility vehicle (SUV), multipurposes utility vehicle (MPV), ect. It becomes a motivation to do research about aerodynamic analysis of a SUV car which is a car variant with huge utilize in Indonesia. In this research, aerodynamic characteristics of SUV car are evaluated by computational simulation with computational fluid dynamics (CFD) approach. CFD simulation yields aerodynamic characteristics data and flow behaviors around car model. Simulation results show that critical drag coefficient (CDcrit) of SUV car is 0.36 with lift coefficient is 0.25. the CDcrit of the car is lower than typical value for a modern car. So that, optimalization of SUV car form which analyzed is needed. Contours of pressure at car surfaces show that high pressure area are located at front of grill and windshield, and low-pressure area are located at nose and leading-trailing roof due to the form nose and leading-trailing roof are streamlines. At back surface of the car, low pressure area are formed by flow separation which creates wake.
EXPERIMENTAL STUDY OF COOLING SPRAY METHOD ONTO INCLINED HEATED SURFACES
Authors: Wibowo Teguh , Hermawan Dedet , Hermawan Dedet , Prakoso Agung , Prakoso Agung
Published: March 2022

Single droplet impingement onto inclined heated surface is studied experimentally. Droplet in the form of aquades is dropped from a fixed height 70 mm to the metal surface with 45º impact angle. This experiment uses 3 types of metals; Stainless Steel AISI 304, Aluminum Alloy 2024, and Copper. All material surfaces are mirror polished and assumed to have the same surface treatment condition. Surface temperatures are 110 ºC, 150 ºC and 210 ºC to determine droplet behavior characteristics. The droplet has 3.0 mm diameter and 28.5 Weber Number (low impact category). In order to analyze droplet behavior in slow motion high velocity camera 4000 fps (frames per second) is used with image resolution 1024 x 768. Data obtained then processed using MATLAB image processing technique to analyze sequence of images visually and quantitatively to determine several parameters; spreading ratio, dimensionless height and contact time.The results showed droplets have different behavior characteristics even at the same surface temperature. Droplet contact time on the copper surface is shorter than aluminum and stainless steel. This is because droplets experienced bouncing due to film boiling regime takes place earlier. Maximum spreading ratio of stainless-steel surfaces is higher than copper because changes of boiling regime on stainless steel surfaces are slower and droplet is still experiencing spreading on the surface
ANALISIS TENSILE STRENGTH KOMPOSIT SERAT DAUN AGEL BERORIENTASI ARAH 0 DERAJAT DENGAN VARIASI MATRIKS
Authors: Pinandhita Lazuardy Rahendra
Published: March 2022

Composite is a material that is made by combining two types of materials that have different properties. Composites material made of natural fiber continue to be researched and developed to become an alternative material for metal substitutes. Natural fibers have advantages such as environmentally friendly, low density, recyclable, biodegradable, non-toxic, low cost, and good non-abrasive and heat retaining properties. The test carried out is a tensile test that is adjusted to the ASTM D3039 test standard using a Universal Testing Machine (UTM) tool to obtain stress and strain values. The results of the tensile strength of the agel leaf fiber composite material with an epoxy matrix with fiber direction 00 is 9.588294 MPa and with a polyester matrix in same direction 00 is equal to 7,236818 MPa.
ANALYSIS OF MAINTENANCE PLANNING C01 CHECK IN AIRBUS A320-214 PK-LUM AT BATAM AERO TECHNIC (BAT)
Authors: Hazhiyah Rika Raudhatul , Pinandhita Lazuardy Rahendra , Mulyani Sri
Published: March 2022

Maintenance is all activities undertaken to maintain the aircraft, its aircraft components and equipment in an air condition including inspection, repair, servicing, overhaul and part change. To be able to perform maintenance properly, every aircraft is required to have a maintenance program. . Batam Aero Technic (BAT) handles MRO work on Airbus A320-214 aircraft with registration number PK-LUM. By analyzing the results of the aircraft maintenance planning to find out the comparison of the results of the planning with the implementation of maintenance. This can maximize the implementation of future maintenance so as not to interfere with aircraft flight operations at Batam Aero Technic (BAT). Before carrying out the treatment process, you should do the planning in advance to ensure that the treatment process runs in accordance with the planning made. To find out the treatment process is running in accordance with its planning or not, it will be analyzed using a fiishbone diagram. Fishbone diagrams are generally used in the stage of identifying problems and determining the cause of the problem. This treatment planning analsis process includes analysis of C01 check care implementation, evaluation of the implementation of C01 check treatment program, treatment delay solution, and C01 check care planning. Then from the results of the analysis the author obtained the cause of delays that occur in the field that is difficult to control such as the problem of delays in the availability of materials / spare parts where ordering and delivery time is needed. Therefore the authors propose to multiply the estimated manhours by 2.5 as an alternative to the anticipation of delayed completion of treatment. This is done to minimize the occurrence of delays in manhours on the ground.
ANALISIS KEGAGALAN NOSE WHEEL STEERING SYSTEM PADA PESAWAT BOEING DENGAN MENGGUNAKAN METODE FAILURE MODE AND EFFECT ANALISYS
Authors: Anggawaty Dwi , Mulyani Sri , Rahmawati Fajar Khanif
Published: March 2022

Aircfrat use nose wheel steering system when landing, take off and landing. In the research discuses the problem of nose wheel steering system B737 – 800 to minimize problems ini nose wheel steering system. The stage of this research are to study the work system of nose wheel steering. Then look for the cause of the problem using the FMEA analysis method. This research is based on data from AFML (aircraft Flight and Manual Log) of the B737 – 800 Aircraft from January 2020 to Junu 2021 at Lion Airline. The results showed that the problem of nose wheel steering system in the failure mode analysis process using FMEA method data in the highest RPN ( Risk priority Number) value is 175 with the case steering collar dan torQ link need lubrication and case Tire pressure that caused by the lack of lubrication on the component and different pressure in tire. Then it is necessary to do inspection before flight.
Numerical Modeling for the Effect of Soil Type on Stability of Embankment
Authors: Hassan Marwan Adil , Ismail Mohd Ashraf Mohamad , Shaalan Heyam Hussein
Published: March 2022

Dike construction has been widely used because of its potential to protect people and properties from overtopping flows. Water levels may exceed a dike crest and cause overtopping flow during high river discharge. This phenomenon has caused serious damage to the dike body due to the reduction of soil shear strength. The increase of water content within particles and its relationship with the development of breach channel failure in downstream and upstream slopes are affected by a series of geotechnical and hydraulic aspects. Transient seepage and slope stability analyses (FOS) were performed in this study using 2D finite element methods and time-history measurements under the effect of sandy and very silty sand soils. The numerical model of SLIDE 2018 was limited by its inability to incorporate all physical processes governing an overtopping breach failure. Numerical analyses were performed to simulate the development of pore pressures and water content at six positions in the dike’s upstream and downstream slopes in physical experimental tests using the van Genuchten Equation and the limit equilibrium method. The numerical results revealed that fine particles increase the pore water pressure and reduce the FOS. Appropriate dike design and maintenance are dependent on surrounding hydraulic conditions, dimensions, and soil types. Non-cohesive materials with fine particles were preferable. Doi: 10.28991/CEJ-SP2021-07-04 Full Text: PDF
Multidimension Analysis of Autonomous Vehicles: The Future of Mobility
Authors: Othman Kareem
Published: March 2022

The level of investment in AVs technology has been increasing over the years as both researchers and developers are cooperating with the objective of developing AVs and understanding their behaviors and implications. Despite the enthusiastic speculation about AVs, little is known about the implications of AVs on our lives and the intertwined relationships between the implications. Thus, the main objective of this paper is to reveal the benefits and risks of AVs and sketch out the main trends in this area in order to provide some directions and recommendations for the future. This study focuses on analyzing the impact of AVs on the required fleet size, vehicle utilization, cost of mobility, public transit service, public behavior, transportation network, land use, economy, environment, society, and public health. Furthermore, the paper analyzes the intertwined relationship between the implications of AVs. Additionally, the paper sheds light on the potential benefits and challenges of the deployment of AVs in developing countries. The analysis shows that while AVs offer multiple benefits, they also pose new risks. The degree to which AVs can affect our plant mainly depends on regulatory actions, as the broader implications of AVs are mainly dependent on how the technology will be adopted, which can be controlled by regulatory actions. Doi: 10.28991/CEJ-SP2021-07-06 Full Text: PDF
Seismic Performance of Staircases in the 3D Analysis of RC Building
Authors: Ahmed Omnia Hussien , Hazem Abdel-Rahman , Shawky Ashraf Adel
Published: March 2022

Stairs play an important role as an escape way and are considered a source of safety in the building during an earthquake. Neglecting the stairs in the 3D analysis model is the main cause of the stairs' failure during the earthquake. Although the previous researchers had focused on the behavior of stairs when changing single variables such as height, location, and layout under seismic loads, no detailed investigation that gathers these variables together was considered. This research studies the effects of changing the number of storeys for a building subjected to an earthquake when considering and neglecting stairs in the 3D analysis with and without shear walls. The effect of the volume and location of the shear wall has been considered through conducting computational analysis using ETABS software to help the structural engineer choose the proper system of stairs and shear walls. Neglecting the staircase in the 3D analysis affects the structure's performance, which leads to ignoring many stresses transferred to the stairs, causing several damages to the stairs during an earthquake. For the existing building without a shear wall, considering the staircases in the analysis improves the performance of the structure under seismic loads. Doi: 10.28991/CEJ-SP2021-07-08 Full Text: PDF
Using a Combination of PID Control and Kalman Filter to Design of IoT-based Telepresence Self-balancing Robots during COVID-19 Pandemic
Authors: Suwarno Iswanto , Ma'arif Alfian , Raharja Nia Maharani , Hariadi Tony Khristanto , Shomad Muhammad Abdus
Published: March 2022

COVID-19 is a very dangerous respiratory disease that can spread quickly through the air. Doctors, nurses, and medical personnel need protective clothing and are very careful in treating COVID-19 patients to avoid getting infected with the COVID-19 virus. Hence, a medical telepresence robot, which resembles a humanoid robot, is necessary to treat COVID-19 patients. The proposed self-balancing COVID-19 medical telepresence robot is a medical robot that handles COVID-19 patients, which resembles a stand-alone humanoid soccer robot with two wheels that can maneuver freely in hospital hallways. The proposed robot design has some control problems; it requires steady body positioning and is subjected to disturbance. A control method that functions to find the stability value such that the system response can reach the set-point is required to control the robot's stability and repel disturbances; this is known as disturbance rejection control. This study aimed to control the robot using a combination of Proportional-Integral-Derivative (PID) control and a Kalman filter. Mathematical equations were required to obtain a model of the robot's characteristics. The state-space model was derived from the self-balancing robot's mathematical equation. Since a PID control technique was used to keep the robot balanced, this state-space model was converted into a transfer function model. The second Ziegler-Nichols's rule oscillation method was used to tune the PID parameters. The values of the amplifier constants obtained were Kp=31.002, Ki=5.167, and Kd=125.992128. The robot was designed to be able to maintain its balance for more than one hour by using constant tuning, even when an external disturbance is applied to it. Doi: 10.28991/esj-2021-SP1-016 Full Text: PDF
Kent Peyzajına Ekolojik Bir Yaklaşım - Etnobotanik Kullanıma Sahip Bitkiler: Marmara Bölgesi Örneği
Authors: YENER Ş. Doğanay , İNAL Özge
Published: March 2022

Çevre sorunlarının her geçen gün arttığı günümüzde sürdürülebilir bahçe tasarımı kapsamında doğala yakın düzenlemeler yapmanın önemi artmıştır. Doğal bitki türlerinin kullanımı ile az bakım isteyen, fazla su tüketiminin önüne geçen tasarımlar ekonomik ve ekolojik bahçe düzenlemelerin temelini oluşturmaktadır. Doğal bitkiler içerisinde yer alan etnobotanik kullanımı olan bitkiler ise, halkın çok yönlü faydalandığı bitkiler olarak dikkat çekmektedir. Çalışmada, etnobotanik kullanıma sahip bitkilerin önemini vurgulamak ve görsel etkisi yüksek olanları belirleyerek kentsel peyzaj düzenlemelerinde kullanımları hakkında öneriler getirmek amaçlanmıştır. Bu sebeple çalışmada; yoğun kentleşme ve ulaşım ağlarına sahip Marmara Bölgesi çalışma alanı olarak belirlenmiş ve bu bölgede etnobotanik kullanıma sahip bitki türlerinin araştırıldığı çeşitli makale ve tez çalışmaları ana materyal olarak ele alınmıştır. Buna göre bölgenin etnobotanik kullanımı olan bitkilerini konu alan toplamda 29 çalışmaya ulaşılmıştır. Bu çalışmalar irdelendiğinde Marmara Bölgesi’nde 737 adet etnobotanik kullanıma sahip bitki taksonunun olduğu görülmüştür. Bu 737 türden 10 ve üzeri çalışmada yer alan 42 tanesi bölgedeki en sık kullanılan türler olarak kabul edilmiş ve bu bitkilerin kent peyzajında kullanım olanakları irdelenmiştir. Sonuç olarak, tasarım potansiyeli yüksek olan bitkilerin şevlerde, otoyollarda, refüjlerde, çatı- kaya- avlu bahçeleri vb. alanlarda kullanımının uygun olduğu tespit edilmiş ve bunlarla ilgili öneriler getirilmiştir.
Latife Tekin’in Manves City ve Sürüklenme Romanlarında Yoksulluk Halleri: İşçi Deneyimi, Sürüklenen Özneler, Direniş ve Umut
Authors: AYDEMİR Feride
Published: March 2022

Bu çalışmada Latife Tekin’in 2018 yılında kaleme aldığı Manves City ve Sürüklenme adlı romanlarındaki yoksulluk temsili ele alınmaktadır. Kurgusal açıdan da birbirine dokunan söz konusu romanların, 2000’li yılların güncel Türk edebiyatında, geç kapitalizmin toplumsal ve ekonomik sonuçlarının, neoliberalizmin farklı yüzlerinin ve küresel kültürün meydana getirdiği kimi çelişkilerin izlerini sürebilmeyi sağlayacak verimli edebi kaynaklar olduğu düşünülmektedir Çalışmanın temel hedefi, ilgili toplumsal ve kültürel sürecin edebi metinlerdeki görünümlerinden yola çıkarak, metinlerdeki yoksulluk temsilinin tarihsel varoluşunu, yoksulların ve işçilerin özne olma hallerini, hegemonik ve karşı hegemonik tutumlarını açığa çıkarmaktır. Bu çerçevede romanlar metinsel bir analize tabi tutulmaktadır. İki romanda da yoksulluk, mekânsal bir yersizyurtsuzlaşma hali ile düşünsel bir kök salamama, yönsüzlük ve tahayyülsüzlük durumuyla iç içedir. Bu yönsüzlük doğadan uzaklaşma haliyle de dolayımlanır. Romanlardaki yoksulluk görünümleri, kapitalist sömürü ilişkilerinin git gide gaddarlaştığı bir dönemde, bir sessizleşme, dilsizleşme, mekanikleşme süreciyle ilişkisel bir bütünlük olarak da kendisini açığa vurmaktadır. Yoksulluğa karşı çıkabilmenin, yabancılaşmayı azaltmanın yolu, hatırlamanın gücünden, dile, söze sahip çıkmaktan ve dayanışmadan geçecektir.
Ethnomathematics at javanese traditional food market
Authors: Febriyanty Lola , Nasution Amanda Syahri
Published: March 2022

This study aims to describe the ethnomathematics of traditional Javanese food or snack in terms of geometry topics. We also study the ethnomathematics profit price sales of typical Javanese snacks  for the linear equation systems topic. This research is a qualitative descriptive study. This research was conducted in Medan Sinembah village specified for market snacks. Data were obtained in interviews, observations, and documentation. The results showed that typical Javanese market snacks' mathematical concepts include two-dimensional geometry, three-dimensional geometry, and linear equations. Ethnomathematics activities in typical Javanese market snacks are counting activities, measuring activities, and geometric aspects.
Pemanfaatan Hasil Sumber Daya Tani Sebagai Inovasi Cabai di Desa Nyiur Tebel Kecamatan Sukamulia Kabupaten Lombok Timur
Authors: Muh. Zubair  , Fikri  , Tegar Humam Rafii  , Sepriadi MW  , Muhamad Faizi Rahman  , I Nengah Suardika  , Nurul Fikria Sagitarini  , Nisfi Sya’bani Karima  , Nanda Meilani Putri  , Baiq Mila Angriani  , Sarmila  , Erna Widiarty
Published: March 2022

Desa Nyiur Tebel merupakan Desa yang memiliki sumber daya alam Petani yang berlimpah, salah satu sumber daya Tani yaitu Cabai. Kurangnya penerapkan sistem pascapanen di Masyarakat diakibatkan karena kurangnya pengetahuan yang terbatas pada Masyarakat, sehingga muncul suatu Inovasi Baru terhadap sumber daya alam Cabai. Inovasi cabai bertujuan  untuk menumbuhkan dan meningkatkan Perekonomian Masyarakat Desa Nyiur Tebel. Produk Inovasi baru dibuat dengan dua macam produk cabai yaitu Sambal Kering dan Bubuk Cabai, dimana produk tersebut dibuat tanpa bahan pengawet dan telah dipasarkan pada unit – unit usaha dagang di Desa Nyiur Tebel.
A Review of Financial Performance of Aircraft Leasing Companies
Authors: KİRACI Kasım , ASKER Veysi , GÜNGÖR H. Yusuf
Published: March 2022

The Covid-19 pandemic has caused many industries, especially the air transport industry, to experience a crisis. It is important to analyze the change in the financial performance of global aircraft leasing companies, one of the most important stakeholders of the airline industry during this crisis period. Therefore, this study aims to analyze the financial performance of global aircraft leasing companies in the period from Q1 2018 to Q4 2020. In the study, we analyzed the financial data of 6 global aircraft leasing companies using the CRITIC-based CODAS method. Our findings indicate that some aircraft leasing companies have been ahead of the competition due to the Covid-19 pandemic, while others have fallen behind in the financial performance rankings. Therefore, our results prove that aircraft leasing companies are affected by the covid-19 pandemic. Our analysis on a sectoral basis indicates the relationship between the debt repayment capacity of airlines and the performance of leasing companies.
Evaluation of the performance measurement of construction project by the Bureau of Public Procurement (BPP) in Anambra State, Nigeria
Authors: Christian Obinna Mgbeahuru  , Christopher Egwu Olughu
Published: March 2022

The study evaluates the performance measurement of construction project by Bureau of Public Procurement (BPP) in Awka-South Local Government Area of Anambra State. A survey design was adopted for the study. Two research questions and two hypotheses guided the study. The population of the study comprised 180 construction professionals. The sample was made up of 124 construction professionals selected through simple random sampling technique. The questionnaire containing 30 items was used to collect data, and the data collected were analyzed using mean, standard deviation and T-test. The findings of the study revealed that the impact of evaluation by BPP on construction projects include contractors’ tendency to: do the right job the first time, complete work on time, identify problems and deficiencies, provide adequate training to employees, minimize interruptions of operations, use high quality materials, works as team players and provide correct documentation and invoices. The recommendations were made. One of the recommendations is that the construction industry should provide quality management guidelines and should be enforced by the consultants on projects. Stakeholders should be committed to quality management and adequate motivation should be given to workers.
Characterization of phenolic compounds, sterols and geographical fingerprint of Memecik extra-virgin olive oils according to their geographical locations by using LC IMS QTOF Mass Spectrometry
Authors: Ayça AKÇA UÇKUN  , Berna ÖZALP ÖZEN  , Serap BİLGEN ÇINAR  , Serap USTAOĞLU  , Betül ÖZDEMİR  , Nergiz Demirtaş  , Sibel PAZARLI  , Oya KÖSEOGLU  , Murat Güven TUĞAÇ
Published: March 2022

Memecik olive oil variety which cultivated in six different locations were evaluated the effects of geographical locations on the chemical characterization of in the southwest of Turkey. The agricultural ecological map of each location was created using GIS. Olive oil samples were analyzed fatty acid, sterol and phenolic. Moreover, LC IMS QTOF spectrometer and Progenesis QI software were used to determine the geographical fingerprints of olive oil samples in different locations. Results showed that oil qualities of all locations differ significantly depending on olive growing area (p <0.05). The Principal Component Analysis of the different locations analyzed revealed that "geographical location" factor significantly affects the olive oil quality.