The light steel roll forming machine is a tool used in the manufacturing industry to continuously shape steel sheets into specific profiles. Efficiency and accuracy in production heavily depend on the control system employed. This article discusses the implementation of an automatic control system in a light steel roll forming machine, focusing on the use of sensors, actuators, and a microcontroller-based control system. Additionally, the system is equipped with a digital printing machine to directly print product branding and light steel specifications. The research results indicate that the application of an automatic control system enhances product precision, improves production efficiency, and reduces the defect rate.

Traffic safety is influenced by several factors including Driver Discipline, Law Enforcement, Motorcycle and Road Conditions. Of the three, have an important role in improving traffic safety with satisfactory results. The purpose of this study was to determine whether or not there is an effect of Driver Discipline, Law Enforcement, Motorcycle and Road Conditions on Traffic Safety on Jl. Holy-Pati Raya In this study, the research population is Traffic Safety on Jl. Raya Kudus-Pati with a sampling system with a total of 100 respondents (sample). The variables in this study consist of: the independent variable is Driver Discipline (X.1), Law Enforcement (X.2), and Motorcycle and Road Conditions (X.3) and the dependent variable is Traffic Safety (Y). The research model is multiple linear regression analysis. The results of the analysis with statistical tools SPSS V.16 program obtained multiple linear regression equation Y = 2.758 + 1.963 X1 + 0.171 X2 + 0.287 X3+ µ . The results of the multiple linear equations show that there is a positive and significant influence between Driver Discipline on Traffic Safety (t count 13.675> t table 1.98447), Law Enforcement on Traffic Safety (t count 1.292 > t table 1.98447), Motor and Road Conditions on Traffic Safety (t count 2.099 > t table 1.98447), individually, Rider Discipline, Law Enforcement, Motorcycle and Road Conditions affect Traffic Safety. The influence of the three research variables is very strong with the coefficient value (R Square) obtained by 71% on Traffic Safety and 29% is influenced by variables that are not detected in this study.

ABSTRAK
Indonesia sebagai negara kepulauan sangat bergantung pada transportasi kapal laut untuk menghubungkan antar pulau. Pada proses perencanaan konstruksi kapal, pemilihan material lambung yang terbaik sangat penting untuk menghadapi masalah korosi. Paduan aluminium dikenal memiliki ketahanan korosi yang baik, sehingga sering dipilih untuk aplikasi di lingkungan korosif, seperti laut. Paduan seri 5xxx, khususnya Aluminium 5083 dan 5052, umum digunakan dalam industri pembuatan kapal karena karakteristik mekanis dan ketahanan korosinya. Lingkungan laut yang agresif dapat mempercepat laju korosi, mengancam integritas struktural lambung kapal. Berdasarkan hal tersebut, diperlukan pemahaman komparatif tentang perilaku kedua paduan ini dalam kondisi korosif seperti air laut. Penelitian ini bertujuan untuk membandingkan laju korosi aluminium 5083 dan 5052 dalam media air laut, dengan fokus pada faktor-faktor yang mempengaruhi korosi serta implikasinya terhadap pemilihan material lambung kapal dengan metode kehilangan berat (Weight Loss) sesuai dengan ketentuan dari ASTM G31-72. Penelitian ini menggunakan desain eksperimen dengan pengujian perendaman kedua jenis aluminium dalam air laut selama beberapa periode waktu (168 hingga 720 jam). Penelitian ini membandingkan laju korosi aluminium 5083 dan 5052 dalam media air laut selama periode waktu tertentu. Hasilnya menunjukkan bahwa aluminium 5083 memiliki laju korosi yang lebih rendah dibandingkan aluminium 5052 pada semua durasi perendaman. Analisis struktur mikro juga menunjukkan distribusi partikel magnesium yang lebih merata pada aluminium 5083, yang memberikan ketahanan korosi yang lebih baik. Penelitian ini menunjukkan aluminium 5083 memiliki ketahanan korosi yang lebih baik dibandingkan aluminium 5052 dalam media air laut, dengan laju korosi yang lebih rendah dan distribusi partikel magnesium yang lebih merata.

The hydrogen economy is a shift in the use of fossil energy to energy derived from hydrogen. Currently, Energy experts are trying to find fuel from new and renewable energy, especially in the transportation sector. This study seeks to determine the profile of energy consumption in the city of Semarang, especially in the transportation sector with simulation calculations in a certain year. By knowing the profile of energy consumption in the transportation sector in the city of Semarang, the output of this research is a planning study to build hydrogen economic infrastructure and make possible steps. At the end of this paper, it will be known how big the potential for hydrogen infrastructure development is so that later it can be a guide in determining the right policy in carrying out hydrogen infrastructure development in the city of Semarang.
The design capacity of hydrogen production at PT. SAMATOR is 1000 m3/hour.

Production breakdown per day : 550 m3/hour x 24hours = 13,200m3.
If the production is maximized for 360 days per year, the total hydrogen production in Semarang is 4,752,000m3.
In 2020, the demand for hydrogen in the city of Semarang = 1,955,780 m3. With this research data, it can be analyzed that hydrogen production in the city of Semarang can meet the needs of hydrogen for transportation in the city of Semarang.

Home security system is a term to describe a system of protection for residents in the environment and its surroundings from the interference of crime. A house has been equipped with high technology and can be connected to the security equipment in the house. Home security is made in order to create security, comfort and safety for residents of the house and can maintain the security of the environment without monitoring. Home security can be operated via a microcontroller and a mobile device. Home security in Indonesia is currently classified as very important, this is because the crime rate is increasing every year. The development of home security has been carried out using various existing technologies, such as the nodemcu microcontroller, which is a hardware platform intended to create prototypes of interactive electronic equipment based on flexible and easy-to-use hardware and software.
This research was conducted to produce a simple home security system by utilizing nodemcu technology and a combination of sensors and an ESP32 cam as a medium to be able to run sensors and home security cameras. This research was conducted by conducting a literature study, exploring the technologies used, as well as the concept of mobile-based software development. The next step is to define requirements, analysis, design, and implementation (programming and testing the system that has been built).

An analysis of the uncertainty value of measuring spur gear dimensions using a profile projector has been carried out. Dimensions of spur gears measured are pitch diameter, root diameter and outside diameter. The manufacture of 3 samples of spur gears was first made with a shape milling machine based on the initial technical data that had been determined. Then measurements were made with a profile projector measuring instrument for the three measuring dimensions, the best repeated measurement average was found in the root diameter measurement for the PJ01 sample of 32.4053 mm with a standard deviation of 0.0077 mm. The uncertainty method used is statistically and applies only to a series of observations. Determination of the uncertainty value is done by performing repeated measurements five times on the same sample. This method refers to ISO GUM with type A evaluation. The uncertainty value obtained for the best measurement is 0.0034 mm with an expanded uncertainty of 0.0068 mm with a 95% confidence level.

Biogas is a renewable energy source with significant potential to reduce dependence on fossil fuels. However, conventional biodigester systems still face several challenges in monitoring methane gas production. Therefore, this research aims to design and develop a biogas digester prototype equipped with a stirrer and an Internet of Things (IoT)-based sensor to detect methane (CH4) gas levels. The research methodology involves designing a biodigester with an automatic stirrer and an MQ-2 sensor that can detect methane gas levels in real time. The data obtained is transmitted via ESP32 and displayed on the Blynk application. The research results show that the designed system can increase methane gas production and allow remote monitoring. The conclusion of this study is that the integration of IoT technology in the biodigester system can improve production efficiency and safety in biogas utilization.

Listrik merupakan kebutuhan energi utama yang banyak digunakan dalam berbagai hal. Penggunaan energi listrik terus menerus memiliki tingkat resiko bahaya yang lebh tinggi oleh karena itu dibutuhkanlah sebuat sistem proteksi untuk mencegah resiko bahaya yang dapat merusak alat atau bahkan manusia. Penelitian ini memiliki tujuan sebagai berikut 1). Menjelaskan secara singkat mengenai sistem proteksi, 2). Menjelaskan sistem proteksi pada switchgear, 3). Menjelaskan komponen switchgear beserta fungsinya, 4). Menjelaskan bagaimana cara perawatan dari switchgear. Metode penelitian ini dilakukan dengan cara observasi, menganalisis, implementasi dan evaluasi. Sistem proteksi switchgear ini mampu berjalan apabila hanya terjadi permasalahan yang melebihi batas nilai yang terpasang.
 
 

This research aims (1) to determine the internal and external factors that cause learning difficulties for students majoring in TKRO at SMK N 4 Lhokseumawe, (2) to find out learning strategies that can help class XI students majoring in TKRO at SMK N 4 Lhokseumawe. This research is descriptive qualitative research. Data was obtained through observation, interviews, documentation. The research subjects were class XI students majoring in light vehicle engineering at SMK N 4 Lhokseumawe. Research data was analyzed using data reduction analysis methods, data presentation, and drawing conclusions. Based on the results of interviews with class Factors that cause learning difficulties include the classroom atmosphere, the way the teacher teaches, and students' internal factors such as physiology and psychology. So this research was conducted with the aim of analyzing and finding strategies to overcome students' learning difficulties. The results of the study with an average acquisition of student learning difficulties of 2.648 are included in the High category. With the qualification of learning difficulties for automotive electrical material is "High" at SMK Negeri 4 Lhokseumawe. In order to overcome this problem, teachers need to change their teaching style and encourage interaction with students, while students need to be more focused and conducive during learning. It is hoped that collaboration between teachers and students can help reduce the level of learning difficulty in automotive electrical subjects for class XI students majoring in light vehicle engineering at SMK N 4 Lhokseumawe.

Pengelolaan kinerja forklift di Gudang Terminal Peti Kemas Semarang memiliki peran penting dalam keefektifan stripping barang impor Less Container Load (LCL). Tujuan penelitian (1) mengetahui hasil perhitungan nilai rata-rata availability ratio pada kinerja forklift dalam kegiatan stripping di Gudang Terminal Peti Kemas Semarang, (2) mengetahui hasil perhitungan nilai rata-rata performance ratio pada kinerja forklift dalam kegiatan stripping di Gudang Terminal Peti Kemas Semarang, (3) mengetahui hasil perhitungan nilai rata-rata quality ratio pada kinerja forklift dalam kegiatan stripping di Gudang Terminal Peti Kemas Semarang, (4) mengetahui hasil perhitungan nilai rata-rata Overall Equipment Effectiveness (OEE) di Gudang Terminal Peti Kemas Semarang. Metode penelitian yang digunakan adalah metode Overall Equipment Effectiveness (OEE) melalui tahapan-tahapan perhitungan (1) perhitungan data penurunan waktu forklift tahun 2023 (2) perhitungan nilai availability ratio (3) perhitungan nilai performance ratio, (4) perhitungan nilai quality ratio, (5) perhitungan nilai indeks Overall Equipment Effectiveness (OEE). Nilai rata-rata availability ratio adalah -0,1616666 %, dimana standar JIPM > 90 %, sehingga hasil menunjukkan ketersediaan forklift tahun 2023 rendah. Penyebabnya bulan Juni forklift mengalami kerusakan mpu board sehingga menjalani perbaikan selama 720 jam untuk waiting part modul fet fm dan board comp dan bulan Juli forklift mengalami kerusakan mesin forklift sehingga menjalani perbaikan selama 744 jam. Nilai rata-rata performance ratio adalah 106,7925 %, dimana standar JIPM > 95 %, sehingga hasil menunjukkan forklift memiliki kemampuan yang baik dalam pengangkutan produk. Nilai rata-rata quality ratio adalah 100 %, dimana standar JIPM > 99 %, menunjukkan kualitas pengangkutan barang baik. Nilai indeks Overall Equipment Effectiveness (OEE) adalah 9,99483 %, dimana standar JIPM > 85 %, menunjukkan produksi memiliki nilai yang rendah.