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All Journal Department of Naval Architecture Rekayasa Mesin Jurnal Rekayasa Mesin Journal of Mechanical Engineering Science and Technology SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Angkasa: Jurnal Ilmiah Bidang Teknologi KACANEGARA Jurnal Pengabdian pada Masyarakat Mekanika: Majalah Ilmiah Mekanika Janaka : Jurnal Pengabdian Masyarakat Jurnal Pendidikan dan Teknologi Indonesia Jurnal Ilmiah Wahana Pendidikan Society: Jurnal Pengabdian Masyarakat Jurnal Rekayasa elektrika Jurnal Abdimas Taawun: Jurnal Pengabdian kepada Masyarakat Rekayasa: Jurnal Penerapan Teknologi dan Pembelajaran Jurnal Inovasi Mesin Jurnal Panjar : Pengabdian Bidang Pembelajaran
Aldias Bahatmaka
Universitas Negeri Semarang
Religion Agriculture, Biological Sciences & Forestry Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing Public Health Social Sciences Other

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STRUCTURAL ANALYSIS OF SEMI-SUBMARINE MONOHULL SHIP FOR TOURISM APPLICATIONS BY USING FINITE ELEMENT METHOD Hutagalung, Christian Imanuel; Bahatmaka, Aldias; Aryadi, Widya; Putrananda , Musdika Bagas Satria; Puteri, Berliana Ayarent
Jurnal Rekayasa Mesin Vol. 16 No. 1 (2025)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v16i1.2020

Abstract

The research assesses the structural integrity of a semi-submersible monohull glass-bottom vessel designed for tourism, featuring a hull length of 9 meters. Finite Element Analysis (FEA) was employed to simulate five loading scenarios: full load, 75% capacity, 50% capacity, 25% capacity, and no load. The ship's structural basis was designated as the boundary condition. The peak equivalent stress under full load was 297.58 MPa, with validated values at 293.93 MPa. Additional scenarios demonstrated comparable concordance between FEA simulations and validations, with stress values spanning from 296.85 to 297.4 MPa and validation results ranging from 293.4 to 293.79 MPa. All calculated safety factors surpassed 2.25, guaranteeing adherence to SOLAS Chapter II-1 rules. The results validate that the ship's hull design complies with structural integrity norms under operational loads, instilling confidence in its performance for tourism purposes.
Capacity Building of Indonesian Migrant Workers in Korea for Post-Contract Preparation Cahyati, Widya Hary; Bahatmaka, Aldias; Putriningtyas, Natalia Desy
Jurnal Abdimas Vol. 28 No. 2 (2024): December 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/x2dsqv31

Abstract

Indonesian Migrant Workers (PMI) are Indonesian citizens working abroad. To meet economic needs, many Indonesian citizens choose to work abroad. The problem found in this service activity is that working abroad has many consequences, one of which is being away from family. However, if they return to Indonesia, Indonesian Migrant Workers (PMI) have concerns about the skills they have to work in Indonesia. For this reason, the solution offered to partner problems is socialization related to digitalization of entrepreneurship through the use of social media, as well as ways to market business products. The purpose of this activity is to increase PMI's capacity as a provision for preparation to make a living after the employment contract in Korea has ended. Thus, PMI can work in Indonesia and be close to family. The method of implementing the activity is to provide socialization with the target to the Indonesian Student Association (PPI) and Indonesian Migrant Workers (PMI) in Korea. The result of this service activity is an increase in knowledge, skills, and motivation from the participants, namely PPI and PMI. In addition, it also received a positive response from all participants. This socialization activity is expected to be carried out to Indonesian migrant workers in other countries.
Design and Construction of a Leisure Boat Bottom Glass Prototype as An Underwater Panorama Tourism Ride in Karimunjawa Aryadi, Widya; Bahatmaka, Aldias; Karnowo, Karnowo; Rumondang, Juwita Ria; Rumapea, Fedrik Immanuel; Kurniawan, Ahmad Khusom; Kusuma, Anwar Widjaya; Hidayat, Indra Nurul
Rekayasa Vol. 22 No. 1 (2024)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/rekayasa.v22i1.13881

Abstract

The lack of proper tourism infrastructure often limits the potential of marine ecotourism. In Karimunjawa, coral reef tourism is a major attraction. However, accessibility remains an issue, especially for visitors who cannot swim or dive. This research focuses on the design and construction of a glass-bottom leisure boat prototype to provide a safe and immersive underwater panorama experience. This study falls within naval architecture and marine engineering, addressing the challenge of designing a stable, efficient, and safe tourism vessel. A key concern in ship design is balancing hydrodynamic efficiency with stability. While monohull boats are common, their transverse stability is relatively low. To overcome this, a catamaran hull configuration was chosen for better stability, larger deck space, and reduced resistance. The prototype was constructed with dimensions of 21.81 m in length, 2.63 m in height, and 7.51 m in width, featuring a glass-bottom viewing area to enhance the tourism experience. Hydrodynamic performance analysis showed an average increase in resistance of 12.39307 N as speed increased, demonstrating the vessel’s efficiency. The construction and testing process confirmed that the catamaran hull improves passenger safety, minimizes capsizing risk, and enhances the underwater viewing experience. This research contributes to sustainable marine tourism by introducing an innovative tourism ride that allows visitors to explore the underwater beauty of Karimunjawa without requiring diving skills. The successful design and construction of this prototype provide a model for future eco-aafriendly tourism vessels.
PENINGKATAN KETERAMPILAN GURU PRODUKTIF SMK DALAM PENDIDIKAN 4.0 MELALUI PELATIHAN PEMBUATAN DAN PUBLIKASI VIDEO PEMBELAJARAN DI YOUTUBE Hidayat, Hanif; Asri, Sarwi; Iskandar, Ranu; Bahatmaka, Aldias; Huda, Khoirul; Leksono, Panggah Bowo; Winarko, Chandra Adi; Arrijah, Hanalinda Kubrus
SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Vol 7, No 4 (2023): December
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpmb.v7i4.17827

Abstract

ABSTRAKPendidikan 4.0 merupakan paradigma pendidikan masa depan, dimana pembelajaran cybergogy yang diterapkan. Pembelajaran ini  memerlukan teknologi digital dan internet dalam penerapannya. Salah satu teknologi digital tersebut adalah video pembelajaran. Salah satu SMK Negeri di Kabupaten Tegal siap mendukung pendidikan 4.0 dengan menerapkan pembelajaran interaktif dengan menggunakan video. Tujuan dari pengabdian ini yaitu untuk meningkatkan keterampilan digital guru produktif SMK.. Ada 3 tahapan dalam pengabdian ini yaitu persiapan, pelaksanaan, dan evaluasi. Tahap persiapan dilakukan dengan (1) mengumpulkan informasi situasi di SMK, (2) mengatur waktu dan tempat pelatihan, dan (3) mempersiapkan alat dan bahan yang akan digunakan saat pelatihan, lembar kuesioner dan soal pretest & posttest. Tahap pelaksanaan menggunakan beberapa metode, yaitu ceramah, demonstrasi, dan praktik langsung. Evaluasi dilakukan dengan memberikan pretest dan posttest, mengisi kuesioner kebermanfaatan pengabdian, dan pengamatan selama proses pelatihan. Hasil pengabdian ini menunjukan bahwa pelatihan ini diadakan pada tanggal 27 Juli 2023 dengan jumlah peserta 15 guru dapat meningkatkan pengetahuan peserta pelatihan dari 56,00 menjadi 77,33 dari skor maksimal 100. Selama proses pelatihan peserta pelatihan termotivasi. Peserta pelatihan merasa sangat puas dengan pelatihan yang dilakukan. Kata kunci: pendidikan 4.0; SMK; video pembelajaran; youtube ABSTRACTEducation 4.0 is a future educational paradigm, where cybergogy learning is applied. This learning is not only assisted by digital technology but uses the internet in its use. One of these digital technologies is learning videos. One State Vocational School in Tegal Regency is ready to support education 4.0 by implementing learning using videos. The purpose of this service is to improve the productive digital skills of SMK teachers. There were 3 stages in this service, namely, preparation, implementation, and evaluation. The preparatory phase was carried out by (1) gathering information on the situation at the SMK, (2) arranging the time and place for the training, and (3) preparing the tools and materials to be used during the training and the pretest & posttest sheets. The implementation phase used several methods, namely lectures, demonstrations, and direct practice. Evaluation was carried out before, during and after the activity by providing pretest and posttest, observing during the training process, and assessing the performance of the trainees. The results of this service showed that this training held on July 27 2023 with a total of 15 teachers participating can increase the training participants' knowledge from 56.00 to 77.33 from a maximum score of 100. During the training process the training participants were motivated. The training participants were very satisfied with the training carried out.. keywords: education 4.0; learning video; vocational high school; youtube
Ibu sebagai komponen penting dalam pemasyarakatan berkendara yang aman: penyuluhan safety riding for MOM (berkendara yang aman) pada Ibu-ibu PKK Kelurahan Ngijo, Gunungpati, Kota Semarang Al-Janan, Dony Hidayat; Bahatmaka, Aldias; Kriswanto, Kriswanto; Setiadi, Rizki
SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Vol 9, No 3 (2025): May
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpmb.v9i3.30556

Abstract

Abstrak Beberapa penelitian menyebutkan bahwa ketertiban dalam berkendara berkaitan dengan tingkat pendidikan, ketrampilan dalam mengendarai kendaraan, dan kesadaran dalam berlalu lintas. Stigma di masyarakat menuduh pengendara yang tidak tertib umumnya adalah wanita terkhusus kaum ibu. Sementara ibu adalah guru pertama dan utama bagi anak-anaknya maka asumsinya orang tua (ibu) yang baik dalam berkendara maka akan didapatkan pula anak-anak yang baik dalam berkendara. Berdasar latar belakang di atas, maka sebagai wujud tri dharma perguruan tinggi diadakan kegiatan pengabdian masyarakat dalam bentuk penyuluhan Safety Riding for MOM (berkendara yang aman) yang dilakukan oleh beberapa dosen Teknik Mesin UNNES kepada ibu-ibu PKK Kelurahan Ngijo, Gunungpati, Kota Semarang. Kegiatan ini dilakukan dengan metode ceramah dan praktek.  Sebagai simpulan, para peserta sangat antusias dan memahami materi yang disampaikan, ditandakan dengan terjawabnya 73% secara benar posttest dalam game  dan dikategorikan serapan materi cukup baik.   Kata kunci: penyuluhan; safety riding; PKK; Kelurahan Ngijo Abstract Several studies have stated that orderliness in driving is related to the level of education, skills in driving vehicles, and awareness in traffic. Stigma in society accuses unruly drivers are generally women, especially mothers. While mothers are the first and foremost teachers for their children, the assumption is that parents (mothers) who are good at driving will also produce children who are good at driving. Based on the background above, as a manifestation of the tri dharma of higher education, a community service activity was held in the form of counseling on Safety Riding for MOM (safe driving) which was carried out by several UNNES Mechanical Engineering lecturers to PKK mothers in Ngijo Village, Gunungpati, Semarang City. This activity was carried out using lecture and practice methods. In conclusion, the participants were very enthusiastic and understood the material presented, indicated by 73% of the posttest answers being answered correctly in the game and categorized as quite good material understanding. Keywords: counseling; safety riding; PKK; Ngijo Village
Application of Science and Technology to Improve Productivity, Quality, and Marketing of Mocaf Bolen in Semarang City Bahatmaka, Aldias; Ardiansari, Anindya; Fibriana, Fidia; Hidayat, Indra Nurul; Sari, Linda; Mayangsari , Effelie Dewi; Prasdika, Tegar Oki; Sandi Pratama , Fajar Rizqi
Society : Jurnal Pengabdian Masyarakat Vol. 4 No. 6 (2025): November
Publisher : Edumedia Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55824/0cmdjb05

Abstract

Micro, Small, and Medium Enterprises (MSMEs) make a significant contribution to economic growth, job creation, community empowerment, and the reduction of economic inequality. By 2023, MSMEs' contribution to Indonesia's GDP is projected to reach 61%, equivalent to IDR 9,580 trillion. The MSME sector absorbs 97% of the national workforce, representing approximately 117 million workers. The number of MSMEs also continues to grow each year, reaching 66 million in 2023, an increase from 65 million in 2022 (KADIN). MSME mentoring is a concrete step in supporting national aspirations, including increasing quality employment, encouraging entrepreneurship, developing creative industries, and supporting infrastructure development. In alignment with the SDGs, this PKM activity helps increase village community income and reduce income disparity. Additionally, MSMEs can apply appropriate technology (TTG) developed through university innovations. In this PKM program, the university’s IKU achievements for students and lecturers relate to IKU 2 and IKU 5, aligning with RIRN in the food sector concerning MSME empowerment for local food processing through TTG. The mentoring provides tangible benefits, with Appropriate Technology such as the Automatic Grinding Machine and Automatic Proofer Machine, resulting in a production increase to 500 Mocaf bolen per day from the original 350, reflecting a 42.86% rise. Furthermore, product diversification training was conducted by processing Mocaf flour into higher-value products such as Bolen Mocaf cookies and Mocaf Banana Bread. Digital marketing and business website mentoring were also implemented to strengthen promotional media, enabling products to access broader and potentially global markets
Improving Understanding of Intellectual Property Legal Protection Irawaty Irawaty; Sunyoto Sunyoto; Wara Dyah Pita Rengga; Aldias Bahatmaka; Godham Eko Saputro
Jurnal Panjar: Pengabdian Bidang Pembelajaran Vol. 5 No. 2 (2025)
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/panjar.v5i2.35692

Abstract

After Indonesia became a signatory to the General Agreement on Tariffs and Trade (GATT) in 1994, Indonesia already had regulations that became the legal basis for the protection of patents, copyrights, trademarks, trade secrets, integrated circuit layout designs, industrial designs, plant variety protection, and geographical indications. In Indonesia, of all the types of IP that have been written, only a few types of IP are quite popular, namely patents, copyrights, and trademarks. Based on the theory of legal awareness stated by Soerjono Soekamto, if someone knows a regulation then it is included in the category of having knowledge only. In fact, for each regulation, the community does not only stop at the level of knowledge but also the level of understanding, attitudes, and behavior to be able to know their legal awareness. In relation to IP regulations, the community (in relation to this community service activity, those who have the potential to own IP, namely Teachers and Students) is expected not only to stop at the level of knowledge but also at the level of behavior (in this case the expected behavior is, at least to record and/or register the IP they own). With the three pillars of IP stipulated, namely registration/recording, commercialization, and protection. IP regulations in Indonesia stipulate that IP that can be protected is IP that has been registered with the DJKI. In connection with the relative lack of understanding of high school/vocational school teachers and students in Semarang City related to the focus and three pillars of IP, it is urgent for the UNNES academic community to contribute significantly as a facilitator to improve the understanding of IP protection with a focus on Copyright for high school and vocational school teachers in Semarang City by conducting workshops and facilitating IP recording/registration. 
Strengthening 3D Model Design Learning by Utilizing Website-Based Onshape 3D to Improve the Competence of Students at SMKN Jateng in Semarang Bahatmaka, Aldias; Darsono, Febri Budi; Irawaty; Prasdika, Tegar Oki; Laksono, Aryo; Habibullah, Muhammad; Muclisin, Choirul Anton
Society : Jurnal Pengabdian Masyarakat Vol. 5 No. 1 (2026): Januari
Publisher : Edumedia Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55824/fm0xbg40

Abstract

This community service is an implementation of science in the field of Design / Engineering, especially 3D object design. The Indonesian creative industry sees great opportunities with 3D design. This is closely related to the development of information technology that is increasing every year. Knowing how to create 3D objects will open up job opportunities for the current generation. In addition, it is also one way to attract scientific interests to the University level, especially in the Mechanical Engineering Department. In facing increasingly fierce global competition, it is very necessary The purpose of this community service program is to provide training in creating 3D objects to vocational school students because there is no comprehensive training on the process of creating 3D objects and their supporting tools. as an effort to improve design skills and also at the same time capture students' interests and talents to be able to learn early about one of the sciences in the Mechanical Engineering Department. 3D object design begins with how to create 3D objects with website-based Onshape3d. Onshape3d with a website was chosen because it is open source or free. Onshape3d's ability to create 3D objects and create 3D animations has long been recognized, because it is open source. To prevent creativity support from becoming a burden, it is hoped that this will become a source of innovation for participants. To assess the effectiveness of the training, student understanding was evaluated through Quizizz before the pre-test and after the post-test of the activity. The pre-test results showed that students' initial understanding of 3D design concepts and CAD software was still relatively low, with an average score of 45%. Their knowledge was still limited to the basic functions of modeling software. After the training, the post-test evaluation showed a significant improvement: the average score jumped to 76%, reflecting a better understanding of 3D design concepts and skills in using OnShape 3D.
Strengthening Education on the Importance of Ethical use of Chatgpt in the Compilation of Student Written Works at Sma Negeri 1 Kedungwuni, Pekalongan Regency Khumaedi, Muhammad; Bahatmaka, Aldias; Rumondang, Juwita Ria; Bahatmaka, Antama; Fahmi, Fiqri Fadillah; Prasdika, Tegar Oki; Laksono, Aryo; Habibullah, Muhammad; Muclisin, Choirul Anton
Society : Jurnal Pengabdian Masyarakat Vol. 5 No. 1 (2026): Januari
Publisher : Edumedia Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55824/1jysh665

Abstract

Learning media in the computer and internet era can help teachers and students learn better. ChatGPT is an AI system that enables conversational interaction through text, can help students understand complex subject matter and improve their learning outcomes. Because the answers are This application is very popular with students because it is well-structured and can solve problems in a short time. However, AI technology, especially Generative Pre-trained Transformer (Chat GPT), has been very important for the advancement of education. In addition, it has an impact on student creativity, originality, and their learning process. This study collected data on student perceptions of the ethics of using ChatGPT. In addition, the written work created was evaluated for its quality. It is hoped that the results of this study will improve our understanding of the possibilities and difficulties of integrating ChatGPT in education. The results of the training on understanding the ethics of using ChatGPT in writing scientific papers for students of SMA Negeri 1 Kedungwuni, Pekalongan Regency, obtained several conclusions: The training was carried out smoothly to students covering the ethical material of using ChatGPT with the quality of creating appropriate prompts and an understanding that AI as a writing aid needs to evaluate the output AI provides. In addition, by holding training, students' abilities in utilizing GPT Chat as a tool in writing papers have increased
Numerical Analysis of The Effect of Chine Variation on The Design of The Senopati Catamaran Fishing Boat on Resistance Based on Maxsurf Resistance Software Fahmi, Fiqri Fadillah; Bahatmaka, Aldias; Naryanto, Rizqi Fitri; Sang Won, Lee
Jurnal Inovasi Mesin Vol. 7 No. 2 (2025): OCTOBER 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jim.v7i2.26453

Abstract

The majority of fishermen in Indonesia still rely on traditional boats that have been built and passed down through generations. These fishermen tend to focus primarily on maximizing their catch, often overlooking other important aspects such as hydrodynamic resistance. In reality, beyond the fishing gear used, one of the key factors influencing the effectiveness of a fishing vessel is its hull design. This study aims to analyze the resistance characteristics of a catamaran-type fishing vessel designed by the Senopati Team. The analysis was conducted using Maxsurf Resistance software with speed variations ranging from 1 to 15 knots. To determine the optimal resistance performance, chine variations were introduced to the hull design, including both single and double chine configurations. Each variation applied chine widths of 5%, 6%, and 7% of the vessel's beam, with chine heights of 1.1 meters and 1.4 meters. The analysis results indicate that resistance increases with vessel speed. However, an increase in chine width generally leads to a reduction in resistance. The most optimal hull configuration was identified as the single chine with 7% width and 1.4 meters height. These findings suggest that the incorporation of chine variations, whether single or double, can effectively reduce the resistance experienced by the vessel compared to a bare hull configuration.
Co-Authors Abdurrahman Abdurrahman Agustinus Purna Irawan Andi Abdullah Ghyferi Andriano, Kriswanto Anindya Ardiansari Antama Bahatmaka, Antama Anwar, Ahmad Ari Dwi Nur Indriawan Musyono Arimaz Hangga, Arimaz Arrijah, Hanalinda Kubrus Asri, Sarwi Azara, Salsa Bila Buana, Lanang Puspa Budi Arif Prabowo, Setya Budi Darsono, Febri Budi Chasan, Ahmad Cho, Joung Hyung Cionita, Tezara Darsono, Febri Budi Didik Supriadi Dony Hidayat Al-Janan Eko Sasmito Hadi Fahmi, Fiqri Fadillah Fidia Fibriana Fiqri Fadillah Fahmi Fitriana, Deni Fajar Fitriyana, Deni Fajar Ghyferi, Andi Abdullah Godham Eko Saputro Hanif Hidayat Hendrix Noviyanto Firmansyah, Hendrix Noviyanto Herlin Pujiarti Hidayat, Hanif Hidayat, Indra Nurul Hilmi Farras, Muhammad Hutagalung, Christian Imanuel Hyoung Cho, Joung Hyung, Cho Joung Imam Pujo Mulyatno Imanu Danar Herunandi Irawaty Irawaty Irawaty Iskandar, Ranu Karnowo - Khoirul Huda Kriswanto Kriswanto, Kriswanto Kurniawan, Ahmad Khusom Kusuma, Anwar Widjaya Laksono, Aryo Laksono, Aryo Eko Laksono, Galih Tri Leksono, Panggah Bowo Manalu, Janviter Markus Diantoro Mayangsari , Effelie Dewi Mera Kartika Delimayanti Muclisin, Choirul Anton Muhammad Habibullah Muhammad Khumaedi Muhammad Yusuf Wibowo Natalia Desy Putriningtyas, Natalia Desy Nubli, Haris Prasdika, Tegar Oki Puspitasari, Windy Desti Puteri, Berliana Ayarent Putrananda , Musdika Bagas Satria Putrananda, Musdika Bagas Satria Rafif Dimas Pratama Ramadhani, Risky Retnaningsih, Prihatini Ridananda, Ayyub Rizki Setiadi Rizqi Fitri Naryanto Rumapea, Fedrik Immanuel Rumondang, Juwita Ria Rusiyanto Rusiyanto, Rusiyanto Salim, Nur Azis Samsudin Anis Sandi Pratama , Fajar Rizqi Sang Won, Lee Sanggrahita, Diadora Sari, Linda Setiadi, Rizki Siregar, Januar Parlaungan Sonika Maulana Sucihatiningsih Dian Wisika Prajanti Sukoco, Imam Sunyoto Sunyoto Supriadi, Didik Sutrisno, Deyndrawan Syafei, M. Hilman Gumelar Vandika, Anggi Wara Dyah Pita Rengga Warsiti Warsiti Warsiti Warsiti Wibowo, Muhammad Yusuf Widya Aryadi Widya Hary Cahyati Winarko, Chandra Adi Won, Lee Sang Yunus, Elfandy