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All Journal International Journal of Electrical and Computer Engineering IAES International Journal of Artificial Intelligence (IJ-AI) Media Statistika Jurnal Ilmiah Teknologi dan Rekayasa ELKHA : Jurnal Teknik Elektro Jurnal Teknologi Rekayasa Mesin Media Mesin: Majalah Teknik Mesin Jurnal Rekayasa Mesin Turbo : Jurnal Program Studi Teknik Mesin Journal of Energy, Mechanical, Material and Manufacturing Engineering Jurnal Kreativitas PKM TELKA - Telekomunikasi, Elektronika, Komputasi dan Kontrol Jurnal Muara Sains, Teknologi, Kedokteran dan Ilmu Kesehatan Infotekmesin Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Journal of Applied Sciences and Advanced Technology International Journal of Marine Engineering Innovation and Research Jurnal Bakti Masyarakat Indonesia Teknosains : Jurnal Sains,Teknologi dan Informatika jurnal syntax admiration Madaniya Journal of Community Development Jurnal INFOTEL Jurnal Keamanan Nasional ABDIKOM Jurnal Polimesin
James Julian
Department Of Mechanical Engineering, Faculty Of Engineering, Universitas Pembangunan Nasional Veteran Jakarta
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PENGARUH PAMDEMI COVID-19 TERHADAP ASPEK BELAJAR PADA PELAJAR SEKOLAH MENENGAH ATAS DI DKI-JAKARTA Julian, James; Wahyuni, Fitri; Zuchriadi, Achmad; Ferdyanto, Ferdyanto; Tua, Lomo Mula
Jurnal Muara Sains, Teknologi, Kedokteran dan Ilmu Kesehatan Vol 5, No 1 (2021): Jurnal Muara Sains, Teknologi, Kedokteran dan Ilmu Kesehatan
Publisher : Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/jmstkik.v5i1.9445

Abstract

Changes in behavior and normal habits during the Covid-19 pandemic are a challenge faced by any part of the world. A sudden change in habit will certainly have a very significant impact on some circles such as students. Changes in the learning system that were previously carried out offline and changed suddenly online certainly have an impact on the readiness of students to prepare themselves. This study aims to examine the impact of quantitative changes in learning habits from offline systems to online systems by using questionnaires distributed throughout the capital city of Indonesia, namely DKI Jakarta. All of these studies were carried out comprehensively and massively to obtain valid and actual data. Several analytical methods are used such as validity tests, ANOVA tests, and Likert scale tests which are useful for (1) ensuring all data is in good Validity, (2) analyzing and drawing some conclusions from changes in student behavior during the Covid-19 pandemic. From the results of the study, it was found that 47% of students living in the capital city of Indonesia already understand the dangers of the Covid-19 pandemic, the online learning system that has been carried out can become a new habit as much as 54%, the problem that hinders students during this pandemic is Mager (lazy to move) by 36% and the most popular learning system during the pandemic was online learning together with teachers by 68%. (2) analyze and draw some conclusions from changes in student behavior during the Covid-19 pandemic. From the results of the study, it was found that 47% of students living in the capital city of Indonesia already understand the dangers of the Covid-19 pandemic, the online learning system that has been carried out can become a new habit as much as 54%, the problem that hinders students during this pandemic is Mager (lazy to move) by 36% and the most popular learning system during the pandemic was online learning together with teachers by 68%.  Keywords: Covid-19, new habits, offline, online, students. AbstrakPerubahan perilaku dan kebiasaan normal selama pandemi Covid-19 menjadi suatu tantangan tersendiri yang dihadapi oleh belahan dunia manapun. Perubahan kebiasaan secara mendadak tentu akan berdampak sangat signifikan terhadap beberapa kalangan seperti kalangan pelajar. Perubahan sistem belajar yang sebelumnya dilakukan secara luring dan berubah tiba-tiba secara daring tentu berdampak pada kesiapan pelajar dalam mempersiapkan diri mereka masing-masing. Penelitian ini bertujuan untuk mengkaji dampak perubahan dari kebiasaan belajar yang berubah dari sistem luring menjadi sistem daring secara kuantitatif dengan mengunakan kuisioner yang disebar ke seluruh wilayah ibukota Indonesia, yaitu DKI Jakarta. Semua penelitian ini dilakukan secara komprehensif dan masif guna mendapatkan data yang valid dan aktual.  Beberapa metode analisis digunakan seperti uji validitas, uji ANOVA dan uji skala Likert yang berguna untuk (1) memastikan seluruh data dalam valitidas yang baik, (2) menganalisa dan menarik beberapa kesimpulan dari perubahan perilaku pelajar selama pandemi Covid-19 ini berlangsung. Dari hasil penelitian didapatkan bahwa pelajar yang tinggal di Ibukota Indonesia sebesar 47% sudah memahami bahaya pandemi Covid-19, sistem belajar daring yang telah dilakukan bisa menjadi kebiasaan baru sebanyak 54%, masalah yang menjadi penghambat pelajar selama pandemi ini adalah Mager (malas gerak) sebesar 36% dan sistem belajar yang paling diminati selama pandemi adalah belajar daring bersama-sama dengan guru sebesar 68%.
Sistem Kendali Daya Listrik Berbasis PZEM-004T dan Blynk Achmad Zuchriadi; Ferdyanto; James Julian
Jurnal Syntax Admiration Vol. 1 No. 8 (2020): Jurnal Syntax Admiration
Publisher : Ridwan Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46799/jsa.v1i8.146

Abstract

UMKM di Indonesia berkembang sangat pesat dimana pada tahun 2015 berjumlah 59,7 juta UMKM. UMKM memberikan kontribusi sebesar 62,6% terhadap PDB dan menyerap tenaga kerja nasional sebesar 97%. Pertumbuhan ini disisi lain menuntut UMKM melakukan berbagai inovasi agar mampu bersaing dan salah satu cara yang dapat dilakukan adalah melakukan efisiensi biaya operasional. Biaya operasional yang memiliki kontribusi besar adalah biaya pemakaian daya listrik. Sebagai solusi akan dilakukan monitoring pemakaian daya listrik dengan bantuan teknologi IoT (Internet of Things). Monitoring daya listrik dengan mengamati kejadian yang bersifat anomali dijadikan acuan untuk melakukan penghematan. Penelitian ini diharapkan bisa menjadi solusi untuk melakukan efisiensi pemakaian daya listrik bagi pemilik UMKM agar memiliki daya saing tinggi. Pemakaian teknologi IoT menjadi keharusan mengingat kemampuannya dalam berbagai bidang
COMPUTATIONAL FLUID DYNAMICS ANALYSIS BASED ON THE FLUID FLOW SEPARATION POINT ON THE UPPER SIDE OF THE NACA 0015 AIRFOIL WITH THE COEFFICIENT OF FRICTION James Julian; Waridho Iskandar; Fitri Wahyuni; Ferdyanto Ferdyanto
Media Mesin: Majalah Teknik Mesin Vol 23, No 2 (2022)
Publisher : Program Studi Teknik Mesin, Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/mesin.v23i2.18217

Abstract

A new method that is more practical, efficient and applicable is proposed to track the position of fluid flow separation on the upper side of NACA 0015. The proposed method is the coefficient of friction curve (Cf) method on the airfoil's upper side. The approach used is a computational fluid dynamics (CFD) approach. The governing equation used is the Reynolds Averaged Navier-Stokes (RANS) equation.  is the turbulence model implemented in this study. The research is conducted on the low Reynolds number category. The low Reynolds number is in the range of values from 104 to 3Í105. Cf can predict the location of fluid flow separation more practically, efficiently, and applicable than the fluid flow velocity profile method. Flow separation begins to form at  =8° at position x/c=0.8. The location of the fluid flow separation continues to move closer to the leading edge as the  airfoil increases. Through the Cf curve, the location of the fluid flow separation is when the Cf curve experiences a sudden decrease and approaches the x-axis. If the separation points are described in the form of velocity profiles and fluid flow velocity contours, it will form an extreme decrease.
Analisis Motor Listrik Tipe Synchronous dengan Metode Komputasi James Julian; Fitri Wahyuni; Lomo Mula Tua; Nely Toding Bunga
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa & Inovasi Volume 3 Nomor 1 Tahun 2021
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v3i1.1879

Abstract

In the current technological development, the electric motor is the most popular in various industrial applications. Electric motors today have evolved very quickly and have a significant impact on the lives of the wider community. The use of environmentally friendly and efficient energy is one of the reasons why this motorbike has become a pioneer of technological advances, especially in the automotive world. This research focuses on conducting a comprehensive analytical study on one type of electric motor, namely synchronous because it is widely applied in various conditions today. The analysis was carried out using a computational method by applying the finite element as a method of solving the magnetic field case involving Maxwell's equations and its impact on the torque generated in this synchronous motor. From the computation results, it is found that this synchronous motor does have a high torque when the magnetic field flux works constantly at 0.015 Wb. With an average torque generated by this synchronous motor of 1.5 kW.
Effect of Single Slat and Double Slat on Aerodynamic Performance of NACA 4415 James Julian; Waridho Iskandar; Fitri Wahyuni; Armansyah Armansyah; Ferdyanto Ferdyanto
International Journal of Marine Engineering Innovation and Research Vol 7, No 2 (2022)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1410.49 KB) | DOI: 10.12962/j25481479.v7i2.12875

Abstract

This study uses a Computational Fluid Dynamics (CFD) approach. The main object in this study is NACA 4415 with slat variations. The airfoil used as the slat is Eppler 421. Reynolds number in this study is 3Í106. This study uses an unstructured mesh with a triangular cell shape with 137824 elements. The use of slats can improve the aerodynamic performance of NACA 4415. NACA 4415 without slat stalled at AoA=16º. Stall on airfoils with a single slat and double slat occurred at AoA=20º. Slat can increase Cl in NACA 4415; however, the difference in Cl increase is not much different when using a single slat or double slat. An airfoil with a single slat, on average, can increase Cl by 20.9129%. The average increase in Cl for an airfoil with a double slat is 25.6878%. Single slat and double slat increase Cd. A single slat increased Cd with an average increase of 26.1109%, and the average increase in Cd for airfoils with double slat was 54.6152%. Single slat can produce a better Cl to Cd ratio than double slat, but the optimum AoA of double slat is 1º higher than single slat. Visualization of fluid flow at AoA=16° shows the fluid flow separation in the airfoil without a slat. The fluid flow separation can be handled well when NACA 4415 is given a single slat or double slat.
Karakteristik Kekerasan Lasan Titik Gesekan dan Pengadukan pada Paduan Aluminium 5052-H112 Armansyah; Juri Saedon; Ferdyanto; Nely Toding Bunga; James Julian
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa & Inovasi Volume 4 Nomor 2 Tahun 2022
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v4i1.3183

Abstract

Issues in friction stir spot welding focus mainly on the mechanical characteristic affected by its Hardness. This Hardness must be maintained by evenly temperature distribution in weld zones during welding. The process parameters are mainly responsible for the development of the hardness of the friction stir spot weld. This study presented the hardness evaluations on the friction stir spot weld via the Hardness-Vickers test and analysis of the temperature distribution in the weld zones via the finite element method. The workpiece samples used in this study were Aluminium alloy 5052-H112 with a thickness of 2 millimeters in the lap-shear mode based on 3 main parameters at low and high levels of parameters configuration. The results obtained via the Hardness-Vickers tests exhibited a value of 42-HV located in the middle of the spot-weld center using a low-level parameters configuration. This value increased to 64-HV around the vicinity of the keyhole. And then the value decreased to 53-HV outside the keyhole, about 6 millimeters from the spot-weld center. Using high-level parameter configuration, the Hardness-Vickers value increased to 61-HV in the middle of the spot-weld center. The value then increased to 76-HV in the vicinity of the keyhole. Furthermore, the value decreased at 60-HV outside the keyhole, which ca 6 millimeters away from the spot-weld center. The temperature distribution of the weld zones achieved 480 oC in the vicinity of the keyhole using the low-level parameter configuration. Slowly, the temperature declined to 380 oC at 6 mm away from the friction spot-weld center in the HAZ. Using the high-level parameters configuration, the temperature distribution reached 540 oC in SZ, and slowly reduced to 425 oC in HAZ. Based on the results, it was found that by using high-level parameters configuration the hardness of the friction stirs spot weld exhibited better Hardness-Vickers value and evenly temperature distribution in the weld zones.
Characterization of the Co-Flow Jet Effect as One of the Flow Control Devices James Julian; Waridho Iskandar; Fitri Wahyuni; Ferdyanto; Nely Toding Bunga
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa & Inovasi Volume 4 Nomor 2 Tahun 2022
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v4i1.3437

Abstract

The computational study discusses the application of the co-flow jet technique as a fluid flow control device on the NACA 0015 airfoil. The numerical equation used is the RANS equation with the k-ε turbulence model. There are three variations of the mesh proposed in this paper. The first variation is a fine mesh with 100,000 elements. The second variation is a medium mesh with 50,000 elements. Meanwhile, the third variation is coarse mesh with 25,000 elements. Based on the mesh independence test results, the mesh with the lowest error value is the fine mesh. Co-flow jet is proven to control fluid flow on the upper side of NACA 0015. Co-flow jet can also improve the aerodynamic performance of NACA 0015 by increasing Cl and decreasing Cd. The increase in Cl was 114% and the decrease in Cd was 24%. The fluid flow separation on the upper side of the airfoil can also be handled well by the co-flow jet.
Aerodynamics Improvement of NACA 0015 by Using Co-Flow Jet James Julian; Waridho Iskandar; Fitri Wahyuni
International Journal of Marine Engineering Innovation and Research Vol 7, No 4 (2022)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v7i4.14898

Abstract

This study analyzes co-flow as active flow control in the object of the airfoil. NACA 0015 is the airfoil used in this study. The airfoil was then modified to add co-flow jet features. Co-flow jet was placed on the upper chamber to analyze its effect on airfoil performance. Further, the Co-flow jet was studied by varying the injected mass flow rate () in the injection slot. The variation of  is 0.15, 0.20, and 0.25 kg/s. The study used CFD with the governing equation RANS. Reynolds Averaged Navier Stokes combined with turbulence model to solve all equations. Two equations for the turbulence model are used in this study. Specifically, this study discusses the aerodynamics of the airfoil, i.e., lift force, drag force, and fluid flow visualization, such as pressure contour and velocity contour. Co-flow jets can improve the aerodynamics of airfoils. The bigger the  injected, the higher the lift coefficient increases. On the other hand, the drag force will be reduced as the number of injected fluid flow increases. Because of that, the airfoil efficiency will be better if using a co-flow jet. However, the Cl/Cdcurve peak shifts to smaller as the injection fluid flow are bigger. The fluid flow visualization by velocity contour on AoA=20° revealed that the co-flow jet could overcome separation. 
The Effect of Capacitors on Frequency Response Amplifier IC TDA2030 as Band-Pass Filter Ferdyanto Ferdyanto; Ade Fikri Fauzi; Mufti Ahmad Fadilah; James Julian; Armansyah Armansyah
ELKHA : Jurnal Teknik Elektro Vol. 14 No. 1 April 2022
Publisher : Faculty of Engineering, Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/elkha.v14i1.52576

Abstract

Amplifier is used as an input waveform amplifier by increasing the voltage using an IC power supply. TDA2030 is an amplifier IC with an Output Transformer Less (OTL) type. The amplifier can operate with a voltage of 12 Volt, 1.5 Ampere. The circuit design process uses Proteus software with a universal reference to the TDA2030 datasheet. Proteus experimental results can be seen by simulating the frequency response. Frequency response tests were carried out to obtain filter used for assemble the circuit to produce an ideal Band-pass filter. Then using Digital Oscilloscope, we can observe difference between waves getting emphasis and those they are not. The objective of this study is to determine the value of capacitor C3 with a good  (frequency cut low). Changing value of C3 can produce the desired BPF output. In the experiment, capacitor C3 0.1uf obtained emphasizes low frequencies between 0-250 Hz. Values of C3 with good BPF 47uf and 100uf because the output produced good bass frequency and is suitable for use because the emphasis occurs between 0-5 Hz. On the amplifier IC TDA2030 has made, capacitor C3 with values 47uf and 100uf ideal to be used as BPF because the filter works in a balanced way.
Reliability Analysis of pH Measurement on TLC4502 with E201C Electrodes based on ATmega328P Microcontroller: Approach to Analysis of Variation with ANOVA James Julian; Fitri Wahyuni; Faiz Daffa Ulhaq
ELKHA : Jurnal Teknik Elektro Vol. 15 No.1 April 2023
Publisher : Faculty of Engineering, Universitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/elkha.v15i1.62982

Abstract

The development of the water management system has so far reached the stage of utilizing IoT technology in the monitoring and operation process. An essential factor in water that affects the quality of a substance is pH. The research aims to analyze and ensure that the devices have a small pH measurement error rate with TLC4502 & E201C. The calibration process was carried out using linear regression, and  value of 0.99 was obtained. Analysis was carried out using one-way ANOVA and Tukey HSD methods, and it was found that all data pairs rejected the null hypothesis (H0) and accepted the alternate hypothesis (H1). This hypothesis indicated a significant difference in the relative measurement error of pH in each condition. The standard error value of each measurement after filtration was 0.00, with an uncertainty value ranging from 0.07 to 0.02. If the sensor can provide measurement results with low error and high accuracy, then the sensor can be widely circulated and used. Through this research, the feasibility of a measuring instrument was developed based on the perspective of errors and high accuracy. A quality measuring instrument certainly helpful in various fields from the fisheries, hydroponics, and environmental sectors.
Co-Authors Achmad Zuchriadi Ade Fikri Fauzi Adi Winarta, Adi Akmal, Reza Najmi Aldi Anggara, Rizki Anggara, Rizki Aldi Annastya Bagas Dewantara Anton Prabowo Armadani, Elvi Armansyah Armansyah Armansyah Armansyah Armansyah Auditya Farha Bagas Dewantara, Annastya Billad, Rayhan Fariansyah Budiarso Budiarso, Budiarso Bunga, Nely Toding Demo Putra Desta Sandya Prasvita Dewantara, Annastya Bagas Dwi Yulia Handayani Eko Andi Prasetyo Faiz Daffa Ulhaq Fauzi, Ade Fikri Ferdyanto Ferdyanto, Ferdyanto Firdaus, Talitha Fatiha Fitri Wahyuni Fitri Wahyuni Fitri Wahyuni Fitri Wahyuni Hapidzha, Putty Harinaldi . I Wayan, Marlon Managi Idris Marbawi Iskandar, Waridho Junaedi, Thomas Juri Saedon Kasih Prihantoro Lomo Mula Tua Lumbantoruan, Regina Lumbantoruan, Regina Natalindah Mahdhudhu, Fathin Muhammad Marbawi, Idris Miftahul Jannah Mirza Fauzan Lukiano Mufti Ahmad Fadilah Nabilah Dwi Gunasti Nandy Putra Naufal, Ridwan Daris Nisa, Rasya Aulia Nathania Nisa, Raysa Oktavia, Nana Triana Parker Stefan, Parker Patrick, Juan Prabowo, Anton Dwi Prakoso, Lukman Yudho Purba, Riki Hendra Putty Fauthyda Zahra Hapidzha Ramadhani, Rifqi Reda Rizal Revan Difitro, Revan Ridwan Daris Naufal Ridwan Daris Naufal Rifqi Ramadhani Rizki Aldi Anggara Rizki Aldi Anggara Rizki Anggara, Rizki Saphira Anggraita Siswanto Sari, Rena Satria, Muhammad Fari Sedeq, Khalees Toding Bunga, Nely Tri Hadinata Tua, Lomo Mula Tulus Hidayat Yusanto Ulfa Hanifah Nurhaliza Ulhaq, Faiz Daffa Waridho Iskandar Waridho Iskandar Yuliana, Sekar Zackharia Rialmi