Universitas Ahmad Dahlan Journal
Not a member yet
5744 research outputs found
Sort by
Penggunaan Metode Classification And Regression Tree (CART) Dalam Mengklasifikasikan Faktor Yang Mempengaruhi Penyakit Diabetes
Full text linkDiabetes adalah penyakit kronis yang ditandai oleh tingginya kadar gula (glukosa) dalam darah. Kondisi ini terjadi ketika tubuh tidak mampu memproduksi atau menggunakan insulin dengan baik. Ada banyak faktor yang bisa mempengaruhi seseorang terkena penyakit diabetes, karenanya diperlukan klasifikasi faktor apa saja yang paling sering menyebabkan penyakit diabetes. Dalam skripsi ini penulis melakukan klasifikasi menggunakan metode Classification and Regression Tree (CART). Data yang digunakan dalam penelitian ini yaitu data penderita diabetes yang bersumber dari kaggle. Hasil penelitian menunjukkan bahwa diperoleh tingkat keakurasian algoritma Decision Tree Classification and Regression Tree (CART) dengan menggunakan confusion matrix menunjukkan bahwa tingkat sensitivity atau ketepatan prediksi pada kelas diabetes sebesar 100%, sedangkan tingkat specificity atau tingkat ketepatan prediksi pada kelas tidak diabetes sebesar 94.4%. Kemudian tingkat akurasi yang diperoleh mencapai 96.6%. Berdasarkan ketiga hasil tersebut, maka metode CART dapat digunakan untuk mengklasifikasikan penyakit diabetes secara optimal dengan hasil yang cukup baik
Performance Analysis of Prediction Methods on Tokyo Airbnb Data: A Comparative Study of Hyperparameter-Tuned XGBoost, ARIMA, and LSTM
Full text linkThe rapid growth of the digital economy has increased the importance of accurately predicting Airbnb property occupancy rates, especially in dynamic and competitive markets such as Tokyo, Japan. Property owners face significant challenges in forecasting occupancy rates due to seasonal patterns, non-linear trends, and complex temporal dependencies within the data. Addressing these challenges, this study investigates the performance of ARIMA, XGBoost, and LSTM models in predicting Airbnb occupancy rates in Tokyo. The dataset is collected from Airbnb listings and includes relevant features such as location, price, customer reviews, and historical occupancy rates. The models were optimized using Grid Search for ARIMA and Random Search for XGBoost and LSTM to identify the best hyperparameter configurations. Evaluation metrics included Mean Absolute Error (MAE), Root Mean Square Error (RMSE), and Coefficient of Determination (R²), which are more appropriate for regression tasks. The results indicate that XGBoost achieves the highest R² (0.23), followed by LSTM (0.19) and ARIMA (0.03). However, the low R² values suggest that the models struggle to capture occupancy rate variations, indicating the potential influence of unmodeled external factors such as seasonality and policy changes. This study highlights the importance of hyperparameter tuning in improving prediction accuracy and contributes by providing an in-depth comparison of regression-based models for Airbnb occupancy forecasting
Development of E-LKPD ecology and biodiversity using PBL-SSI to enhance secondary students' environmental literacy
Full text linkThe lack of material in teaching materials related to the environment around students is one of the causes of low environmental literacy. This results in low student knowledge of environmental issues and solutions to these problems. Problem-based learning is an alternative solution for students to practice analyzing problems using a socio-scientific issues approach. The research on the development of E-LKPD Ecology and Biodiversity by integrating the PBL-SSI learning model aims to enhance secondary students' environmental literacy. The type of research conducted is research and development (R&D) with the ADDIE development model, using a pre-experimental design with a group pretest-posttest design. This research was conducted at SMP N 3 Bawang in class VII using a small-scale test with 9 students and a large-scale test with 120 students. The results of this study were declared valid with high score criteria consisting of a material expert validity value of 0.93 and a media expert validity value of 0.94. This research is also very practical with a value of 98.48%, and very effective, with a value of 84.4%. Based on the results of data analysis, it can be seen that the E-LKPD Ecology and Biodiversity can improve students' environmental literacy
The Role of Self-Acceptance and Self-Confidence in Quarter-Life Crisis Among Early Adulthood in Medan
Full text linkThe transition from adolescence to early adulthood involves various emotional and social challenges. This study examined the relationship between self-acceptance and self-confidence with quarter-life crisis among early adults in Medan. Using a quantitative design and purposive sampling, data were collected from 369 individuals aged 20–40 years through Likert-type psychological scales. Data analysis using multiple linear regression showed that both self-acceptance and self-confidence significantly correlated with quarter-life crisis (p < 0.05), with an R² value of 0.336. This indicates that the two variables explain 33.6% of the variance in quarter-life crisis. Higher self-acceptance and self-confidence were associated with lower levels of quarter-life crisis. The novelty of this study lies in its focus on internal psychological factors in an Indonesian urban context. These findings underscore the importance of psychological support programs in enhancing self-perception and resilience among young adults
From Home to Heart: Investigating the Mediating Role of Spirituality in the Relationship between Family Functioning and Character Strength
Full text linkPrevious studies have demonstrated that character strength significantly influences students’ future success, with the dimension of humanity being a central aspect of individual character. This study aimed to examine the relationship between family functioning and students’ character strengths, with spirituality serving as a mediating variable. Addressing a gap in existing literature, this research highlights the dual influence of environmental and internal factors in the development of character strength—whereas previous studies have predominantly focused on external determinants alone. A total of 317 junior high school students participated in the study by completing an online questionnaire. The instruments used included the Values in Action Inventory for Youth (VIA-Youth), the Aspects of Spirituality (ASP) Questionnaire, and the Family Assessment Device (FAD). Data were analyzed using JASP (Jeffrey’s Amazing Statistical Program). The findings revealed that spirituality significantly mediated the relationship between family functioning and character strength (β = 0.070, SE = 0.013, p < 0.001). Notably, the direct effect of family functioning on character strength (β = 0.158, SE = 0.023, p < 0.001) was lower than the total effect when the mediator was included (β = 0.228, SE = 0.024, p < 0.001). These findings underscore the importance of spirituality as an internal mechanism that promotes prosocial behavior and contributes to the development of students’ character strengths. Additionally, positive family functioning plays a foundational role in shaping students’ intrinsic values and moral dispositions. The implications of this study support efforts to strengthen human development policies and interventions aimed at fostering resilient and virtuous youth capable of adapting to future societal challenges
The influence of work engagement, work motivation, resilience, and job stress on the job satisfaction of honorary teachers in Central Java
Full text linkThis study examines the influence of work engagement, work motivation, resilience, and job stress on the job satisfaction of honorary teachers in Central Java. The research employs a quantitative approach utilizing a cross-sectional study design. The population for this study consists of honorary teachers who instruct at elementary and high schools in Central Java, with a minimum of five years of teaching experience and a willingness to participate as research subjects. The sampling technique employed was purposive sampling, which resulted in 384 participants. Data collection instruments included job satisfaction, work engagement, work motivation, resilience, and job stress scales. The results of the multiple regression analysis indicate a coefficient of determination (R) of 0.965, an F-value of 1301.778, and a p-value of 0.000 (p < 0.001). Based on these findings, it can be inferred that work engagement, work motivation, resilience, and job stress collectively influence the job satisfaction of honorary teachers in Central Java. Furthermore, the study revealed that resilience contributes more significantly to job satisfaction than the other variables. Therefore, local government initiatives to improve job satisfaction among honorary teachers in Central Java should focus on various strategies, particularly by providing programs for adaptive skills development and problem-solving, such as stress management training, to bolster the resilience of honorary teachers in coping with working pressures
The effect of problem-based learning model integrated dual coding theory on numeracy literacy learning outcomes of growth and development of living things material
Full text linkThis study aims to obtain information on the effect of Problem Based Learning (PBL) model integrated with Dual Coding Theory (DCT) on learning outcomes of numeracy literacy on the material of growth and development of living things. The subjects of this study were students of SMAN 4 Kendari class XI.J and XI.M. The research design used quasi-experiment with nonequivalent control group design. Sampling using probility sampling technique. Indicators of numeracy literacy learning outcomes measured are, analyzing data or information, explaining, and drawing conclusions. Data analysis techniques using descriptive analysis and inferential analysis. The results of descriptive analysis showed that the average increase in numeracy literacy learning outcomes of students taught using the PBL model integrated DCT (treatment class) obtained a result of 84.1 and the PBL model (control class) obtained an average value of 74.9. The results of hypothesis testing show that t count = 4.237> t table = 1.690 which means that there is a significant effect of the PBL model integrated with DCT on the numeracy literacy learning outcomes of students on the material of growth and development of living things
Dari Dadu ke Data: Transformasi Ular Tangga Menjadi Alat Edukasi Peluang Empirik
Full text linkPembelajaran yang inovatif dan menyenangkan menjadi kunci untuk meningkatkan pemahaman peserta didik, khususnya dalam mata pelajaran matematika yang kerap dianggap sulit dan membosankan. Penelitian ini bertujuan untuk menganalisis penggunaan permainan ular tangga sebagai media pembelajaran dalam meningkatkan pemahaman konsep peluang empirik. Penelitian ini menggunakan pendekatan kualitatif deskriptif dengan subjek sebanyak 15 siswa kelas VIII B SMP Internasional Darul Akhwan yang dibagi menjadi tiga kelompok. Teknik pengumpulan data dilakukan melalui pre-test, post-test, observasi, dan wawancara. Analisis data mengacu pada model Miles dan Huberman yang meliputi reduksi data, penyajian data, serta penarikan kesimpulan dan verifikasi. Hasil penelitian menunjukkan bahwa penggunaan permainan ular tangga memberikan pengaruh positif terhadap pemahaman peserta didik. Permainan ini mampu menciptakan suasana belajar yang menyenangkan, meningkatkan partisipasi aktif, dan mendorong interaksi antarsiswa. Peserta didik menunjukkan peningkatan hasil belajar setelah pembelajaran berbasis permainan diterapkan. Selain itu, mereka menjadi lebih antusias dan mudah memahami konsep peluang melalui pengalaman bermain secara langsung. Permainan ular tangga ini menjadi strategi pembelajaran alternatif yang efektif dalam menyampaikan materi peluang empirik secara lebih kontekstual dan bermakna
EKSPLORASI ETNOMATEMATIKA TERHADAP KONSEP GEOMETRI PADA STRUKTUR TEBING BREKSI
Full text linkPenelitian ini bertujuan untuk melakukan eksplorasi terhadap etnomatematika pada Tebing Breksi yaitu sebagai upaya memudahkan proses pembelajaran matematika dengan pendekatan budaya, khususnya dalam mengenal bangun datar dan ruang pada bangunan Tebing Breksi sehingga suatu proses belajar yang terjadi lewat adanya aktivitas secara kultural oleh kelompok masyarakat, yaitu proses menghitung atau menganalisis data. Jenis penelitian yang digunakan adalah penelitian eksploratif-deskriptif. Adapun alur penelitian terdiri atas pendokumentasian segala hal yang terkait dengan Tebing Breksi, melakukan wawancara terhadap responden, memperoleh hasil, dan kesimpulan penelitian. Hasil penelitian menunjukkan bahwa metode pengukuran yang digunakan lebih modern dengan menggunakan teknologi saat ini sedangkan berbeda dengan pengukuran pembuatan ornamen sangat sederhana yang dimulai dari menggunakan jari tangan dan penggaris mistar. Selain itu, pada rancang bangunan Tebing Breksi terdapat konsep geometri bangun datar dan bangun ruang. Adapun konsep bangun datar pada bangunan Tebing Breksi, antara lain konsep dan prinsip segitiga pada pringgitan, pola persegi pada bebatuan, dan pola lingkaran pada Amphitheater Mini. Selanjutnya konsep-konsep bangun ruang pada Tebing breksi, yaitu konsep dan prinsip prisma segitiga pada atap gazebo tradisional, konsep dan prinsip kubus pada bangku batu tradisional, konsep, dan prinsip balok dalam bangku batu tradisional
Adolescent Fathers with Unplanned Pregnancies and Their Journey in English as a Second Language Learning: a Multiple Case Study
Full text linkAdolescent fatherhood, particularly in the context of unplanned pregnancies, presents unique challenges that disrupt educational and linguistic development. This study explored the lived experiences, challenges, and coping mechanisms of young fathers in relation to learning English as a second language. Using a qualitative multiple case study design, five adolescent fathers from public and alternative learning institutions in Mindanao, Philippines, were purposively selected. Data were gathered through semi-structured interviews, classroom observations, and document analysis, then analyzed using Colaizzi’s thematic method with member checking and triangulation to ensure rigor. Findings revealed struggles with English proficiency, comprehension difficulties, and emotional strain, but also highlighted persistence, child-driven motivation, and adaptive time management as coping strategies. The study extends Role Conflict Theory, Self-Determination Theory, and Ecological Systems Theory by illuminating how adolescent fathers negotiate competing roles. Practical implications include designing flexible class schedules, providing targeted ESL tutoring, and implementing school- and community-based support programs for young fathers