Purpose: Breast cancer remains a significant cause of mortality among women, requiring accurate diagnostic methods. Traditional classification models often face accuracy challenges due to missing values and irrelevant features. This investigation advances the classification of breast cancer through the amalgamation of the C4.5 algorithm with K-Nearest Neighbor (KNN) imputation and Relief feature selection methodologies, thereby augmenting data integrity and enhancing classification efficacy.
Methods: The Wisconsin Breast Cancer Database (WBCD) was the core reference for evaluating the proposed methodology. KNN imputation addressed missing values, while Relief selected the most relevant features. The C4.5 algorithm executed training by utilizing data segregations in the corresponding proportions of 70:30, 80:20, and 90:10, with its efficiency gauged through a range of metrics, particularly accuracy, precision, recall, and F1-score.
Result: This innovative methodology achieved the highest classification accuracy of 98.57%, surpassing several existing models. Particularly noteworthy, the strategy being analyzed exhibited remarkable success relative to PSO-C4.5 (96.49%), EBL-RBFNN (98.40%), Gaussian Naïve Bayes (97.50%), and t-SNE (98.20%), demonstrating associated advancements of 2.08%, 0.17%, 1.07%, and 0.37%. These results confirm its effectiveness in handling missing values and selecting relevant features.
Novelty: Unlike prior studies that addressed missing values and feature selection separately, this research integrates both techniques, enhancing classification accuracy and computational efficiency. The findings suggest that this approach provides a reliable breast cancer diagnosis method. Future work could explore deep learning integration and validation on larger datasets to improve generalizability.

SMK Kristen Surakarta menghadapi tantangan dalam meningkatkan daya tarik dan memperkuat citra sekolah akibat persaingan ketat dengan SMK lain serta persepsi negatif masyarakat. Untuk mengatasi hal tersebut, dilakukan pengabdian masyarakat dengan strategi penguatan branding melalui sosialisasi literasi digital dan pelatihan teknologi Virtual Reality (VR). Kegiatan ini bertujuan untuk meningkatkan pemahaman digital siswa serta kemampuan mereka dalam menggunakan VR sebagai media promosi sekolah. Metode yang diterapkan meliputi penyuluhan interaktif, pelatihan teknis, dan evaluasi dengan pretest serta posttest. Hasil kegiatan menunjukkan peningkatan pemahaman siswa terhadap literasi digital sebesar 92%, integrasi VR dalam promosi sebesar 94%, dan kemampuan berpikir kritis sebesar 96%. Kesimpulannya, kegiatan ini efektif dalam meningkatkan keterampilan digital dan pemanfaatan teknologi VR, yang diharapkan berdampak pada citra positif dan daya tarik SMK Kristen Surakarta di masyarakat.

Kabupaten Magelang menghadapi tantangan kompleks dalam pengelolaan sampah akibat pertumbuhan penduduk dan aktivitas ekonomi yang pesat. Metode yang digunakan adalah kegiatan sosialisasi pengelolaan sampah, aksi bersih-bersih lingkungan, dan pembagian apotek hidup. Tujuan pemberdayaan masyarakat desa dalam konservasi sumber daya alam hasil sosialisasi dan edukasi lingkungan ini yaitu untuk meningkatkan kesadaran, pemahaman dan partisipasi masyarakat desa dalam pengelolaan sampah, menumbuhkan budaya gotong royong, menciptakan lingkungan yang lebih sehat, serta mendorong pemanfaatan tanaman obat sebagai alternatif pengobatan alami guna mewujudkan Desa Girikulon yang lebih lestari dan mandiri. Program kerja berupa sosialisasi dan edukasi kolaborasi Tim 23 KKN Untidar Tidar Periode Januari 2025 bersama Dinas Lingkungan Hidup (DLH), kerjabakti kebersihan bersama warga setempat dan pembagian apotek hidup ini disambut baik oleh masyarakat, dan secara berkelanjutan dapat menciptakan desa yang bersih dan sehat.

This study aims to analyze consumer behavior in purchasing decision-making at traditional markets in Surakarta City. The focus of this research is to identify the factors that influence consumer purchasing decisions, such as price, product quality, location, service, and shopping habits. The method used is a quantitative approach with a survey method. Data were collected through the distribution of questionnaires to 100 respondents who are active consumers at several traditional markets in Surakarta, such as Pasar Gede, Pasar Klewer, and Pasar Legi. The data analysis technique used is multiple linear regression to examine the influence of independent variables on the dependent variable. The results show that price, product quality, and service have a significant influence on purchasing decisions, while location and shopping habits do not show a significant influence. These findings indicate that consumers in traditional markets in Surakarta tend to prioritize economic value and service interaction in their purchasing decisions. This research is expected to provide input for traditional market managers in improving competitiveness amidst the growth of modern markets.

Tantangan yang saat ini dibutuhkan oleh guru SMA adalah menciptakan inovasi pembelajaran berbasis teknologi. Saat ini kecerdasan buatan (AI) telah muncul sebagai solusi potensial untuk meningkatkan kualitas pembelajaran di tengah pesatnya kemajuan teknologi. Namun, geografi Indonesia yang luas membuat fasilitas teknologi pendidikan belum merata. Oleh karena itu, guru di SMA Muhammadiyah 2 Semarang perlu meningkatkan kompetensi literasi digitalnya, terutama untuk teknologi terkini. Program ini telah berhasil membuka wawasan guru terhadap teknologi baru dan memberikan keterampilan praktis dalam mengintegrasikan teknologi Kecerdasan Buatan Generatif ke dalam proses pembelajaran. Para guru diberikan pembekalan penggunaan teknologi ChatGPT dan Gemini untuk mempersiapkan bahan ajar. Hasil evaluasi menunjukkan bahwa guru mampu memahami dan mulai menerapkan teknologi AI dalam pembuatan materi ajar, serta merasa termotivasi untuk terus menggunakannya secara berkelanjutan dalam pembelajaran.

The purpose of this study is to examine the structure of economic performance and identify superior clusters in districts/cities in order to develop a basis for formulating effective regional development strategies. The methodology used is quantitative with a descriptive approach that includes analysis of location quotient (LQ), shift share and class typology. Secondary data comes from official institutions such as the Central Statistics Agency (BPS). The results of the study indicate that Sidoarjo has an advantage in the manufacturing sector (LQ 1.85) and is included in the category of advanced and rapidly developing regions. Lamongan stands out in the agricultural and fisheries sectors with significant growth, although its contribution to GDP is low, it is classified as a rapidly developing region. Gresik has a large and solid commercial sector, but its growth is still lagging behind the national average. Pasuruan is included in the lagging category because its education services sector has not become the mainstay of the economy. The cluster approach has proven successful in identifying regional potential and formulating data-based development policies. Cross-sector collaboration and responsive and supportive government policies are key factors in developing superior clusters that can accelerate regional economic growth in an inclusive and sustainable manner.

Mutiara Serpong Villa Complex, located in Pondok Jagung Timur Village, South Tangerang, is surrounded by the BSD City area. This area faces environmental problems due to the uncontrolled growth of water hyacinth (Eichornia Crassipes) in the surrounding lakes and swamps, causing irrigation disruption and decreasing water quality. Water hyacinth is known as a weed that damages the aquatic environment, but it also has positive potential as a raw material for organic fertilizer. This program aims to overcome the problem of the spread of water hyacinth by utilizing the plant into organic compost. Water hyacinth compost contains high nutrients, helps improve soil properties, and improves the quality and quantity of plants. This initiative is expected to provide environmental benefits while increasing the income of the surrounding community through the use of water hyacinth as organic fertilizer. Community Service Activities at the Mutiara Serpong Villa Complex use several methods that aim to provide understanding and skills about making compost from water hyacinth to the local community. There are five main stages: Socialization, Counseling, Training and Practice, Observation and Evaluation, Sustainability. This method is designed to increase active community participation and the sustainability of water hyacinth compost use as a beneficial environmental solution.

In the era of digital transformation, technology plays a central role in shaping the future of education. This study explores the role of school principals as transformative leaders in promoting technology-based learning, particularly in the context of Indonesian schools. Using a descriptive qualitative approach, data were collected through in-depth interviews with school principals, teachers, and education personnel from schools that have integrated technology into their teaching and learning processes. Secondary data were obtained from government policies, official school documents, and relevant literature. Thematic analysis was employed to identify key patterns related to leadership practices that support the adoption of educational technology. The findings reveal that effective principals act not only as visionaries and change agents but also as facilitators, mentors, and collaborators who foster inclusive and innovative school environments. They play a critical role in developing teachers’ digital competencies, ensuring adequate infrastructure, and building a positive digital culture. This study highlights the importance of strategic leadership in overcoming challenges such as limited resources and resistance to change. The results provide practical guidance for principals and policymakers to develop sustainable technology-based education programs and contribute to the global discourse on educational leadership in developing countries.
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Character education is an important aspect in supporting moral development in students. Through character education, students can be equipped with strong moral values, so that they can become individuals with good character and contribute positively to society. Character education can help students develop the ability to think critically, make the right decisions, and behave ethically. In addition, character education can also help students develop an awareness of the importance of moral values, such as honesty, empathy, and responsibility. Thus, character education is very important in supporting moral development in students and helping them become individuals with good character and contribute positively to society. Therefore, character education needs to be a priority in the education system, so that students can be equipped with strong moral values ??and become individuals with good character.

Education plays a pivotal role in Indonesia's national development, as it significantly impacts the quality of human resources. Consequently, the government prioritizes education by aiming to develop students who are devoted to God Almighty, knowledgeable, and possess noble character. Educational personnel, particularly school principals, hold a strategic position in achieving these objectives. A school principal's leadership is essential in managing educational resources, collaborating with teachers and staff, and guiding students toward learning goals. In a decentralized education system, principals function as top administrators with multiple roles, including manager, supervisor, educator, leader, innovator, and motivator. However, educational challenges often stem from distortions in meaning and practice, which contribute to declining education quality. As the primary agent of school leadership, the principal must demonstrate professional competence to identify school needs, empower existing resources, and involve the community in achieving educational goals. The concept of modern schools—such as model and exemplary schools—has emerged in response to society’s demand for quality education. In this context, the school principal is required to lead with strategic planning, administrative effectiveness, and inspiring leadership to ensure school success and student achievement. This study explores the multifaceted role of the school principal in improving educational quality, emphasizing their responsibilities in management, leadership, educational support, and administration. It concludes that professional and competent principals are essential for shaping a school environment conducive to educational excellence and preparing competitive human resources in the global era.