UNY Journal (Universitas Negeri Yogyakarta)
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CHARACTERISTICS OF HARDNESS AND MICROSTRUCTURE OF RECYCLED PISTONS MANUFACTURED BY SAND CASTING PROCESS
Full text linkMotorcycle piston waste, made from aluminum, is often poorly managed despite its advantages in corrosion resistance and thermal conductivity. This study aims to enhance the economic value of piston waste through recycling using the sand casting method. The melting process was conducted at a temperature of 843°C, followed by casting into sand molds. The recycled product is intended for use as a ship propeller component. Tests performed included Vickers hardness testing and microstructural analysis to evaluate the mechanical properties and material characteristics. The results showed that the recycled material exhibited an average hardness of 77.2 kg/mm², consistent with standard aluminum hardness. Microstructural analysis revealed the presence of porosity which may affect mechanical strength; however, this porosity did not reduce the material's resistance to mechanical damage and provided good toughness. Based on these findings, it can be concluded that motorcycle piston waste recycled by sand casting at 843 °C has potential for use in manufacturing high-value components such as ship propellers, considering the hardness quality and microstructural characteristics of the material
PRESCRIPTIVE MAINTENANCE OF KOMATSU DUMP TRUCK HD785-7 USING NAÏVE BAYES CLASSIFIER UNDER FULL MAINTENANCE CONTRACT
Full text linkThis study proposes a Prescriptive Maintenance (RxM) framework aimed at improving the Physical Availability (PA) of Komatsu Dump Trucks HD785-7 operated under a Full Maintenance Contract (FMC) at PT ABC Site Sangkulirang. The research integrates the DMAIC methodology with the Knowledge Discovery in Databases (KDD) process to systematically analyze operational failures. Historical breakdown data were preprocessed and modeled using a Naïve Bayes (NB) classifier, selected for its robustness in handling categorical features common in maintenance records. The model demonstrated high predictive performance with 97.93% accuracy, 100% precision, 94.12% recall, and an AUC of 0.995, indicating strong reliability in distinguishing high-risk conditions. The RxM framework was embedded into daily maintenance planning and Standard Operating Procedures (SOPs), supported by a monitoring dashboard for continuous feedback and retraining. As a result, the proportion of Breakdown Unscheduled (BUS) events decreased from 45% in 2024 to 26% in mid-2025, while fleet PA consistently exceeded the contractual target of 92%, reaching 95.5%. These findings confirm that embedding prescriptive analytics into maintenance workflows not only reduces unplanned downtime but also enhances resource allocation and decision-making. The case study highlights the practical value of combining statistical learning with structured process improvement to drive digital transformation in mining operations
Mode Choice and Spatial Distribution of Coal Transport in Jambi, Indonesia
Full text linkCoal is an important commodity for Jambi Province. Based on data from the Central Bureau of Statistics, in the first quarter of 2022, the value of coal exports reached 10.75% of the total export value. Apart from being exported, coal commodity is also used for domestic purposes. The transport used at this time is only through public roads. The use of these routes results in many problems such as traffic accidents, congestion, and social conflicts. Therefore, the number of vehicles allowed to pass on public roads is limited. This has resulted in the production target plan not being achieved, only 17.3 million tonnes out of 40 million tonnes in 2022. Hence the need for other routes for transport such as rivers, special roads, and railways. This research is intended to analyse coal transport trips using trucks, barges and railways. This research discusses the closest route, mode selection, and transport costs based on the distance travelled and the travel time of each mode. The search for the closest travel route is done by spatial analysis with Network Analyst on ArcGIS. Mode choice was analysed using the multinomial logit method. Meanwhile, transport costs are calculated based on the principle of generalised cost. Modelling results on the selection of mode, during the rainy season the most efficient mode is barging with a selected probability of 44%, while rail 28% and transport by truck 27%. During the dry season, the probability of transport by railway is 93%, barge 4% and truck 3%. The results indicate that the most efficient mode during the rainy season is barging and during the dry season transport by railway
Pembelajaran Sosiologi dalam Pembentukan Budaya Toleran
No full textIndonesia, sebagai negara yang beragam dan multikultural, menghadapi peluang sekaligus tantangan dalam mengelola heterogenitas sosialnya. Keragaman dapat menjadi kekuatan nasional, tetapi juga berpotensi menimbulkan konflik jika tidak dikelola dengan baik. Meningkatnya kasus intoleransi di kalangan pelajar menjadi isu krusial yang memerlukan perhatian akademik. Penelitian ini bertujuan untuk mengkaji peran sosiologi dalam membentuk budaya toleransi di sekolah. Dengan menggunakan pendekatan kualitatif, penelitian ini menerapkan metode studi kepustakaan dengan menganalisis dokumen terkait Kurikulum Merdeka, kebijakan pemerintah, serta artikel ilmiah tentang pembelajaran sosiologi, pendidikan multikultural, dan toleransi. Hasil penelitian ini mengidentifikasi tiga aspek utama: habitus toleransi di sekolah, peran pembelajaran sosiologi dalam membangun budaya toleran, dan kompetensi guru sosiologi dalam menanamkan nilai-nilai toleransi. Temuan ini menegaskan pentingnya pendidikan sosiologi sebagai alat strategis dalam membentuk sikap toleransi di kalangan siswa dan menciptakan lingkungan sekolah yang inklusif.Indonesia, as a diverse and multicultural nation, faces both opportunities and challenges in managing its social heterogeneity. While diversity can be a source of national strength, it also has the potential to generate conflict if not properly managed. The increasing cases of intolerance among students have become a critical issue that requires scholarly attention. This study aims to examine the role of sociology in fostering a culture of tolerance in schools. Using a qualitative approach, this research employs a literature review method, analyzing documents related to the Merdeka Curriculum, government policies, and academic articles on sociology education, multicultural education, and tolerance. The findings highlight three key aspects: the habitus of tolerance in schools, the role of sociology education in cultivating a tolerant culture, and the competencies of sociology teachers in promoting tolerance. These findings emphasize the importance of sociology education as a strategic tool for instilling tolerance among students and fostering inclusive school environments
Antara Ruang Publik dan Komersialisasi: Produksi Ruang dalam Pengembangan RTH Central Park Meikarta
No full textDalam konteks urbanisasi yang pesat, ruang terbuka hijau (RTH) berfungsi sebagai ruang sosial strategis bagi masyarakat urban. Penelitian ini bertujuan menganalisis alih fungsi lahan dalam pengembangan RTH Central Park Meikarta dan bagaimana masyarakat Cikarang merespons keberadaannya. Menggunakan pendekatan kualitatif dan metode deskriptif, analisis dilakukan dengan kerangka Teori Produksi Ruang Henri Lefebvre. Data dikumpulkan melalui wawancara, observasi, studi pustaka, dan dokumentasi. Temuan menunjukkan bahwa konversi lahan hunian menjadi RTH publik-komersial merupakan proses produksi ruang yang dipengaruhi kepentingan ekonomi. Perubahan ini berdampak pada pola penggunaan ruang dan relasi sosial masyarakat sekitar. Meskipun sarat kepentingan kapital, masyarakat tetap merasakan manfaat ekologis dan sosial dari keberadaan RTH, seperti ruang rekreasi dan interaksi. Penerimaan masyarakat terhadap RTH dibentuk oleh interaksi antara fungsi ruang, pengalaman sosial, dan nilai guna yang dirasakan dalam kehidupan sehari-hari.
In the context of rapid urbanization, green open spaces (GOS) serve as strategic social arenas for urban communities. This study aims to analyze land-use conversion in the development of Central Park Meikarta and how Cikarang residents respond to its presence. Using a qualitative approach and descriptive method, the analysis applies Henri Lefebvre’s Theory of the Production of Space. Data were collected through interviews, observations, literature review, and documentation. The findings reveal that the conversion of residential land into a public-commercial GOS reflects a space production process shaped by economic interests. This transformation affects spatial usage patterns and social relations among the surrounding community. Despite the underlying capitalist motives, residents perceive ecological and social benefits from the GOS, such as recreational areas and spaces for interaction. Public acceptance is shaped by the interplay between spatial function, social experience, and the perceived utility of the space in everyday life
Dari Stigma Menuju Penerimaan: Transformasi Konsep Diri ODHA Melalui Relasi Spiritual di Majelis Sinau Agomo
No full textPenelitian ini bertujuan untuk mengkaji dan menganalisis konsep diri ODHA dalam konteks pengembangan agama di Majelis Sinau Agomo, serta interaksi yang terjalin dengan anggota komunitas lainnya sehingga mempengaruhi konsep diri pada ODHA. Penelitian ini menggunakan metode kualitatif dengan pendekatan fenomenologi. Teknik yang digunakan dalam mengumpulkan data melalui metode kualitatif yaitu terknik wawancara mendalam, observasi, dan dokumentasi. Hasil penelitian menunjukkan bahwa ODHA di Majelis Sinau Agomo mengalami perubahan positif dalam konsep diri mereka berkat dukungan komunitas dan lingkungan yang inklusif. Kegiatan keagamaan tidak hanya berfungsi sebagai sarana spiritual, tetapi juga sebagai media guna membentuk konsep diri ODHA dimana pendalaman agama dapat memperkuat rasa kepercayaan diri dan memberikan dukungan sosial. Melalui partisipasi dalam komunitas keagamaan, ODHA dapat menemukan pemahaman yang lebih baik tentang diri mereka, mengurangi stigma, dan membangun hubungan yang positif dengan lingkungan sekitar.
This paper explores the dinamycs of self-concept among people living with HIV/AIDS in the context of religious development at Majelis Sinau Agomo, as well as interactions with other community members that affect the self-concept of ODHA. This research uses a qualitative method with a phenomenological approach. The techniques used in collecting data through qualitative methods are in-depth interviews, observation, and documentation. The results showed that ODHA in Majelis Sinau Agomo experienced positive changes in their self-concept thanks to community support and an inclusive environment. Religious activities not only serve as a spiritual tool, but also as a medium to shape the self-concept of ODHA where increased religion can strengthen self-confidence and provide social support. Through participation in religious communities, ODHA can find a better understanding of themselves, reduce stigma, and build positive relationships with the surrounding environment
Developing reviewing gamification on specific learning differences (SpLDs) for pre-service teachers at slow learners care
Full text linkThis research develops a language learning gamification model based on the needs analysis of teacher candidate's workshops on Specific Learning Differences (SpLDs). This research used research and development (R&D) method using Kemp's Instructional Design Model, the data analyzed qualitatively from primary data sources include document analyses of reputable books and relevant journal articles. This research revealed that Quizizz's incorporation into pedagogical workshops replaces traditional paper-based quizzes with interactive games, indicating heightened engagement among adults when gamified learning. Each item is accompanied by clear instructions and employs diverse modes like images, videos, or audio to enhance comprehension. This multimodal approach motivates students by facilitating the integration of textual and visual elements in their learning process. Incorporating reviewing designed games, such as Quizizz, in preservice teachers' workshops for SpLDs is a highly inclusive accommodation. The use of diverse multimodalities and carefully designed questions is essential for ensuring inclusivity and accessibility. This approach shows promise for improving student engagement and addressing the needs of learners with SpLDs
PENGARUH KEAKTIFAN BERORGANISASI DAN PENGALAMAN PKL TERHADAP KESIAPAN KERJA MELALUI MOTIVASI BELAJAR SEBAGAI VARIABLE INTERVENING PADA MAHASISWA FEB UNY
No full textAbstrak: Pengaruh Keaktifan Berorganisasi dan Pengalaman PKL terhadap Kesiapan Kerja Melalui Motivasi Belajar sebagai Variable Intervening pada Mahasiswa FEB UNY Penelitian bertujuan untuk menganalisis pengaruh keaktifan berorganisasi dan pengalaman PKL terhadap kesiapan kerja dengan motivasi sebagai variabel intervening. Pendekatan kuantitatif digunakan dengan sampel 256 mahasiwa FEB UNY Angkatan 2020 yang telah mengambil Paktik Industri (PI) dan Praktik Kependidikan (PK). Analisis dilakukan dengan regresi linier untuk hipotesis 1, 2, 3, dan 4, melalui program SPSS, hipotesis 5 dan 6 melalui program AMOS dan quantpsy.org. Hasil: (1) Terdapat pengaruh positif dan signifikan Keaktifan Berorganisasi terhadap Kesiapan; (2) Terdapat pengaruh positif dan signifikan Praktik Kerja Lapangan terhadap Kesiapan; (3) Terdapat pengaruh positif dan signifikan Keaktifan Berorganisasi dan Praktik Kerja Lapangan terhadap Kesiapan; (4) Terdapat pengaruh positif dan signifikan Motivasi Belajar terhadap Kesiapan; (5) Terdapat pengaruh positif dan signifikan Keaktifan Berorganisasi terhadap Kesiapan Kerja melalui Motivasi Belajar sebagai variabel; (6) Terdapat pengaruh positif dan signifikan Praktik Kerja Lapangan terhadap Kesiapan Kerja melalui Motivasi Belajar sebagai variabel intervening . Kontribusi hasil riset ini adalah menjadi salah satu dasar dalam melakukan perancangan kurikulum serta kegiatan kemahasiswaan untuk mendukung kesiapan lulusan kompeten.Kata kunci: Keaktifan Berorganisasi; Praktik Kerja Lapangan; Kesiapan Kerja; Motivasi Belajar; Mahasiswa FEB UNYAbstract: The Influence of Organizational Involvement and Internship Experience on Job Readiness through Learning Motivation as an Intervening Variable among FEB UNY StudentsThe research aims to analyze the influence of organizational involvement and internship experience on work readiness, with learning motivation as an intervening variable. A quantitative approach was employed, using a sample of 256 students from the Faculty of Economics and Business, Yogyakarta State University (FEB UNY), Class of 2020, who have undertaken Industrial Practice (PI) and Educational Practice (PK). Analysis was conducted using linear regression for hypotheses 1, 2, 3, and 4 through SPSS, while hypotheses 5 and 6 were analyzed using AMOS and quantpsy.org. The results are as follows: (1) Organizational involvement has a positive and significant effect on work readiness; (2) Internship experience has a positive and significant effect on work readiness; (3) Organizational involvement and internship experience jointly have a positive and significant effect on work readiness; (4) Learning motivation has a positive and significant effect on work readiness; (5) Organizational involvement has a positive and significant effect on work readiness through learning motivation as an intervening variable; (6) Internship experience has a positive and significant effect on work readiness through learning motivation as an intervening variable. The contribution of this research is to serve as a basis for curriculum design and student activities to support the development of competent graduate readiness. Keywords: Organizational Activity; Field Work Practices; Job Readiness; Learning Motivation; FEB UNY Student
Visual Persuasion: Assessing the Influence of Political Posters on Voter Behavior of Bangladesh
No full textPolitical posters play a significant role in shaping voter perceptions and behaviors in Bangladesh, employing visual elements such as color, design, and symbolism to effectively communicate messages and resonate emotionally with diverse electorate groups. This study investigates the influence of these posters on voter behavior toward political candidates and parties, drawing on established theoretical frameworks like the Elaboration Likelihood Model (ELM). Through a survey-based approach, our findings reveal that posters exert substantial influence, with a majority of respondents acknowledging their role in shaping political opinions. Emotional appeals embedded in posters are shown to sway voter decisions, emphasizing the posters' effectiveness in engaging voters through both central and peripheral routes of persuasion. Moreover, the study highlights posters' enduring impact beyond elections, contributing to sustained political attitudes and fostering democratic engagement in Bangladesh's socio-political landscape. By aligning with existing literature on visual persuasion and political communication, this research underscores the critical role of posters as powerful tools in influencing public opinion and promoting civic participation.
Keywords: political poster, persuasion, voter behavior, Bangladesh, civic participatio
Holistic Approach in Strengthening Social Resilience in Drug-Prone Areas : Case Study in Pulau Negara
Full text linkDrug trafficking and substance abuse represent significant challenges, particularly in regions highly vulnerable to these issues. Pulau Negara, identified as a drug-prone area within Hulu Sungai Selatan Regency, frequently experiences incidents of illicit drug trafficking and abuse. The persistence of these drug-related activities can be attributed to the community's insufficient social resilience. This study aims to (1) analyze the current state of social resilience in Pulau Negara; (2) identify the multilevel vulnerability factors contributing to this issue; and (3) propose strategies to enhance the community's resilience against drug-related threats. The findings reveal that social resilience in Pulau Negara is critically weak, influenced by a range of vulnerabilities at the individual, family, and community levels. Key factors include economic pressures, peer influence, unstable family structures, and a lack of supportive community infrastructure. The proposed strategies adopt a comprehensive approach, encouraging collaboration among stakeholders such as local authorities, law enforcement, and community leaders to build a more resilient social framework. By addressing these vulnerabilities holistically, the recommended interventions aim to reduce the community's susceptibility to drug-related activities and promote sustainable social resilience