Universitas Ahmad Dahlan Journal
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The Effectiveness of Data Imputations on Myocardial Infarction Complication Classification Using Machine Learning Approach with Hyperparameter Tuning
Get PDFComplications from Myocardial Infarction (MI) represent a critical medical emergency caused by the blockage of blood flow to the heart muscle, primarily due to a blood clot in a coronary artery narrowed by atherosclerotic plaque. Diagnosing MI involves physical examination, electrocardiogram (ECG) evaluation, blood sample analysis for specific heart enzyme levels, and imaging techniques such as coronary angiography. Proactively predicting acute myocardial complications can mitigate adverse outcomes, and this study focuses on early prediction using classification methods. Machine learning algorithms such as Support Vector Machine (SVM), Random Forest, and XGBoost were employed to classify patient medical records accurately. Techniques like K-Nearest Neighbors (KNN) imputation, Iterative imputation, and Miss Forest were used to handle incomplete datasets, preserving vital information. Hyperparameter optimization, crucial for model performance, was performed using Bayesian Optimization, which minimizes the objective function by modeling past evaluations. The contribution to this study is to see how much influence data imputation has on classification using machine learning methods on missing data and to see how much influence the optimization method has when performing hyperparameter tuning. Results demonstrated that the Iterative Imputation method yielded excellent performance with SVM and XGBoost algorithms. SVM achieved 100% accuracy, precision, sensitivity, F1 score, and AUC. XGBoost reached 99.4% accuracy, 100% precision, 79.6% sensitivity, an F1 score of 88.7%, and an AUC of 0.898. KNN Imputation with SVM showed results similar to Iterative Imputation with SVM, while Random Forest exhibited poor classification outcomes due to data imbalance, causing overfitting
The Potential of Sugarcane Bagasse (Saccharum officinarum Linn.) as a Basic Ingredient for Making Cosmetics and Its Effectiveness as an Exfoliator and Skin Moisturizer
Get PDFSugarcane bagasse (Saccharum officinarum Linn.) contains most of the phenolic compounds including gallic acid, ferulic acid, epicatechin, quercetin, and kaempferol. Various phenolic compounds contained in sugarcane bagasse, especially phenolic acids, have important bioactivity for the cosmetics industry. The aim of this research is to determine the potential of sugarcane bagasse as an active ingredient in cosmetics and its effectiveness as an exfoliator and skin moisturizer. This research method is experimental, using sugarcane bagasse samples with concentrations of 1%, 3% and 5%. The results of phytochemical screening showed that sugarcane bagasse contains phenolic compounds, flavonoids and phytosterols. Based on the research results, sugarcane bagasse exfoliating gel at concentrations of 1%, 3%, and 5% increased skin tone respectively, namely 1.00 ± 0.67; 0.40±0.49; and 0.30 ± 0.39. Sugarcane bagasse moisturizing gel at concentrations of 1%, 3%, and 5% had a percent increase in skin water content, respectively, namely 6.92 ± 11.094; 2.72±10.21; and 3.36 ± 6.49. Based on SPSS analysis, it is known that variations in the concentration of bagasse extract and the time of use have a significant effect on increasing skin tone. Meanwhile, variations in the concentration of bagasse extract did not have a significant effect on increasing skin water content. However, the time of use has a significant effect on the increase in skin water content. So, it can be concluded that sugarcane bagasse extract has the potential to be an active ingredient in making cosmetics and is effective as an exfoliator and skin moisturizer
Is Group Guidance with Problem Solving Technique Effective in Enhancing Students’ Learning Independence?
Get PDFThis study aims to know the effectiveness of group guidance using problem-solving technique to increase students' learning independence in junior high schools. The type of research conducted in this study is an experiment with a pre-experimental research design, utilizing the one-group pretest-posttest design model. The sample was determined using simple random sampling, consisting of a total of ten students. The data collection instrument used was a learning independence scale. Data analysis was performed using the paired sample test. The results of this study indicate that group guidance using problem-solving technique is effective in enhancing students’ learning independence. The findings of this research can serve as a technical solution for guidance and counseling services for guidance and counseling teachers in their efforts to increase students’ learning independence in junior high schools
The Effectiveness of Life Skills-Based Information on Increasing Self-Confidence and Career Planning
Get PDFThe problems that students experience most common today are a lack of self-confidence and a lack of career planning. This study is quantitative, using a quasi-experimental design with a non-equivalent control group design, aiming to determine the effectiveness of life skills-based career information services for high school students. The respondents in this study were twelfth-grade high school students, with a total of 72 students selected using simple random sampling. The instrument used in this study was a questionnaire. The data analysis techniques used were descriptive statistical analysis, normality tests, homogeneity tests, and paired sample t-tests for testing the effective contribution. This Life Skills-Based Career Information Service is effective and proven to be significant. These results suggest that career information services need to be provided to students so that they can determine career choices according to their potential
Measuring Cyberbullying Levels among Adolescents in Integrated Islamic Junior High Schools in Jambi City: An Implementation of the Rasch Model
Get PDFThe incidence of cyberbullying in adolescents is increasing. This is, in part, attributed to the progress of Science and Technology (IPTEK), which is inseparable from the negative impact of cyberbullying. The latter has become central to adolescent communication. Consequently, cyberbullying, especially among adolescents, demands serious attention for early intervention. The purpose of this study was to measure the level of cyberbullying among students at SMP IT Jambi City by implementing the Rasch Model, a modern theoretical approach enhancing the accuracy of measuring latent variables. The research included 91 students from classes VII and VIII, selected through proportional random sampling. Data collection employed the Cyber Victim and Bullying Scale (CVBS) with 28 questions. The Rasch Model analysis revealed a high level of cyberbullying among adolescents at SMP IT Jambi City, with 52.2% categorized as high and 47.8% as low. The results demonstrated high accuracy, evident in validity and reliability coefficients of 0.87 and 0.71, respectively. This research provides valuable information for stakeholders aiming to maintain a cyberbullying-free climate
Forgiving Others towards Self-Happiness: A Meta-Analysis Review
Get PDFThis article presents a meta-analytic study examining the relationship between forgiving others and personal happiness. Data were collected from fifteen sources across thirteen articles, involving a total of 6,651 participants (57% female; 43% male). The results, using a random effects model, indicate a significant positive relationship between forgiveness and happiness (z = 5.793; p < 0.001; 95% CI (0.179; 0.360)). The correlation is moderate, with the confidence interval ranging from 0.179 to 0.361. This meta-analysis supports previous studies that suggest a positive correlation between forgiving others and increased happiness. Specifically, individuals who are willing to forgive tend to experience higher levels of happiness compared to those who do not forgive. Age and country of origin showed no significant differences. The implications of this study suggest that age and country of origin are not relevant factors for justifying a lack of forgivenes
Narratives of Filipino Young Adults Who Have Experienced Cheating in Their Romantic Relationships
Get PDFThis study explored the narratives of young adults who are victims of cheating in romantic relationships. The narratives of ten participants aged 18 to 25 years were examined through in-depth qualitative interviews. It described their experiences, how they cope, and how they form their subsequent relationships. The data were analyzed through thematic analysis, which revealed that participants discovered their partner's infidelity through their social media, friends, or self-discovery. Regardless of gender, this led to traumatic physical, social, and emotional effects. Coping mechanisms varied from unhealthy behaviors, such as engaging in vice and self-harm, to positive ones, such as writing literature. This study is important for Filipino Psychology because it examines the intricacies of healing and relational growth among young adults grappling with infidelity. Understanding cultural contexts provides input for ways of helping focused on resilience and well-being
Improving the Generation Z’s Self-Esteem and Decreasing their Mental Issues by Creative Expression Art Therapy
Get PDFThis research focuses on adolescents with mental health issues such as stress and anxiety. Stress is described as general daily pressure that affects daily behavior, while anxiety is defined as excessive worry about future events. Both stress and anxiety are closely associated with low self-esteem, which refers to an individual's perception and evaluation of their ability to face and solve problems. Various interventions can enhance self-esteem, with art therapy being particularly effective for adolescents. In this study, the State Self-Esteem Scale (SSES) was used to measure self-esteem, and the DASS-21 was used to assess stress, anxiety, and depression symptoms. Five female participants completed the intervention, which consisted of eight sessions conducted over five days. This research utilized a quasi-experimental pre- and post-test method. The intervention results showed a significant increase in global self-esteem scores, as well as changes in stress, anxiety, and depression level
Internal Structure of the Beach Center Family Quality of Life Scale: Indonesian Version
Get PDFFamily functioning has a broad impact on the psychological condition of family members, making it a variable often examined in research. The instruments used to measure family functioning vary in the dimensions they assess due to different theoretical approaches. One such measurement tool that comprehensively assesses dimensions and aligns with Indonesian Government Regulations is the Beach Center Family Quality of Life Scale (BCFQLS). However, its utilization in research in Indonesia remains limited. This study aimed to evaluate the psychometric quality of the BCFQLS using confirmatory factor analysis. The participants in this study were 331 married individuals who lived with their spouses and had at least one child. The results of the CFA indicate that the model fits the original structure of the BCFQLS, encompassing dimensions of family interaction, parenting, emotional well-being, and physical/material well-bei
Development of Information Service Modul to Enhance Meaning of Life: A Study on Minangkabau Adolescents
Get PDFThis study examined the development of informational service materials aimed at enhancing the meaning of life among Minangkabau ethnic students in secondary schools. "Meaning of life" is a psychological concept referring to an individual's sense of purpose, significance, and life satisfaction. The research employed a Research and Development (R&D) approach using the ADDIE model, and data analysis was conducted using the Wilcoxon Signed Rank Test. The results indicate that the developed informational service materials are valid in terms of content and design, practical, and effective in improving the students' meaning of life. These materials were tested on a small group using a limited trial method, which demonstrated an increase in the meaning of life before and after the informational service was provided. The implications of this study suggest that the use of informational services to enhance the meaning of life can be effectively applied to students, as it has a positive psychological impact