Directory of Scientific Journals Indonesian Society of Applied Science (ISAS)
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Management Audit To Assess The Human Resource Function Of The Finance Department At RSUD Anuntaloko Parigi
Full text linkThis study aims to assess the effectiveness of managing the human resources (HR) function in the finance department of Anuntaloko Parigi Hospital through a management audit approach. Management audit is used as an evaluation tool to measure the extent to which the HR function is carried out effectively in accordance with applicable standards. This research uses descriptive qualitative methods with data collection techniques in the form of interviews and documentation. The audit object includes seven aspects of the HR function, namely planning, recruitment, selection and placement, training and development, performance appraisal, compensation, occupational health and safety, and termination of employment (PHK). The audit results show that most HR functions have run effectively and in accordance with applicable standards. However, weaknesses were found in the aspects of long-term HR planning and recruitment processes that were not fully transparent. This study recommends the need for improvements in job and workload analysis on a regular basis and strengthening the competency-based recruitment system. Management audit is proven to be a strategic tool in identifying weaknesses and encouraging improved HR performance in the hospital environment
KOPISA: Rancang Bangun Sistem Otomatis Pengemasan Plastik untuk Biji Kopi dengan Fitur Pemantauan Suhu dan Berat
Full text linkIndustri pada umumnya adalah aktivitas untuk menghasilkan produk. Dalam kegiatan industri terdapat beberapa proses seperti pengumpulan bahan baku, produksi, quality control, pengemasan, dan pemasaran. Salah satu masalah yang sering terjadi adalah pada tahap pengemasan. Jika proses pengemasan tidak efisien, hal ini akan menghambat hasil produksi karena membutuhkan banyak waktu dan tenaga. Oleh karena itu, tugas akhir ini bertujuan untuk merancang dan membuat alat pengemas plastik yang dapat mengubah plastik lembaran menjadi kemasan. Alat ini dilengkapi dengan fitur pemantauan suhu pada pemanas dan pemantauan berat kemasan untuk meningkatkan kualitas hasil kemasan. Sistem ini menggunakan mikrokontroler Arduino Mega2560 sebagai pusat kendali, motor servo untuk katup bak penampungan, sensor load cell untuk penimbangan, motor DC sebagai penggerak sealer, dan LCD untuk menampilkan data. Alat ini mengubah plastik lembaran menjadi kemasan yang direkatkan menggunakan pemanas. Komponen pendukung lainnya meliputi relay dan sensor suhu DS18B20. Hasil pengujian menunjukkan alat ini dapat bekerja optimal pada suhu 60-65°C dengan delay pengepresan 2500 ms. Pengemasan menunjukkan akurasi berat yang baik dengan persentase error rata-rata 8,75% untuk 100gram dan 5,05% untuk 200gram. Selisih berat rata-rata antara load cell dan timbangan konvensional adalah 1,29 gram, dan sensor suhu menunjukkan selisih rata-rata 0,878°C dengan error 1,818%
THE EFFECT OF THE NUMBER OF FIBER SHEETS AND NaOH CONCENTRATION ON THE IMPACT STRENGTH OF ALKALI-TREATED ARTHOCARPUS ELASTICUS PEELED FIBER COMPOSITESTITLE
Full text linkThe focus of this study is the effect of NaOH alkali treatment and the number of fiber sheets on the impact strength of Artocarpus elasticus (lantung bark) fiber as a sustainable reinforcing material in natural fiber composites. However, lignin and hemicellulose can prevent the fibers from adhering to the resin. NaOH treatment improves fiber quality by removing these barriers, enhancing their mechanical properties. This study examines how differences in the number of fiber sheets and NaOH concentration affect the impact strength of the composite. The objective of this research is to determine how the number of fiber sheets, NaOH concentration, and combinations of these factors affect the impact strength of Artocarpus elasticus fiber composites subjected to impact testing. The study found that NaOH treatment significantly enhances the impact strength of lantung wood composites, with results continuing to improve. However, for the number of wood fiber sheets, the impact strength was highest after treatment with 4 wood fiber sheets. The optimal combination yielding the highest impact test results was the combination of 9% NaOH alkalization treatment with 4 fiber sheets, resulting in an impact value of 0.08 J/mm². 
THE INFLUENCE OF TEMPERATURE AND SCREW ROTATION SPEED ON DIAMETER IRREGULARITY IN PLASTIC EXTRUSION USING RECYCLED PLA
Full text linkThis research investigates the effect of extrusion temperature and screw rotation speed on the diameter irregularity of filaments produced from recycled polylactic acid (PLA) using a single screw plastic extruder. The study addresses the growing demand for sustainable 3D printing materials by reprocessing failed or unused PLA prints into usable filament. Experimental variables included three temperature settings (150°C, 160°C, and 170°C) and three screw rotation speeds (20 rpm, 30 rpm, and 40 rpm), producing a total of 360 diameter measurements. The results show that both temperature and screw rotation speed significantly influence diameter consistency, with screw speed having a more dominant effect. The optimal condition for achieving the target filament diameter of 1.75 mm was found at 170°C and 40 rpm, yielding a predicted diameter of 1.7378 mm with a desirability score of 0.97888. These findings confirm the potential of recycled PLA as a viable material for consistent filament production when proper extrusion parameters are applied. The test was done by using minitab software to aid the research analysis
Pengaruh Proporsi Silica Fume Dengan Penambahan Zat Additive Terhadap Kuat Tekan Mortar
Full text linkMortar is commonly used in construction as a strong and durable building mixture that is relatively easy to make. One of the problems that often occurs in Indonesia, especially in buildings located in coastal areas, is the rapid rusting of reinforcement or the degradation of bricks due to not receiving sufficient protection from mortar as the outermost part. Mortar plays a crucial role in construction by acting as an adhesive for bricks, wall plaster, and ceramic tiles, while also providing protection for construction joints. Because of this, the mortar needs to have the maximum strength possible. Adding alternative ingredients, such as silica fume and Superplasticizerconsol SS 74 N, to the mortar is one way to achieve this goal. Different amounts of 0.5% Superplasticizer and 10% and 20% silica fume percentage were added, and compressive strength tests were conducted after 7, 14, and 28 days. The results of the research show that the effect of adding Silica fume and Superplasticizer to mortar has the potential to reduce the compressive strength value, with the maximum compressive strength value for normal mortar aged 28 days being 49.41 Mpa, while for mortar variations of SF 10% and 20% 37.48 Mpa and 30.43 Mpa.Mortar umumnya digunakan dalam konstruksi sebagai campuran bangunan yang kuat dan tahan lama yang relatif mudah dibuat. Salah satu masalah yang sering terjadi di Indonesia, khususnya pada bangunan yang berada di daerah pantai adalah cepat berkaratnya tulangan atau terdegredasinya bata akibat tidak mendapat perlindungan yang cukup dari mortar sebagai bagian terluar. Mortar memainkan peran penting dalam konstruksi dengan bertindak sebagai perekat untuk batu bata, plester dinding, dan ubin keramik, sekaligus memberikan perlindungan untuk sambungan konstruksi. Oleh karena ini mortar harus memiliki kuatan yang optimal dan salah satu upaya yang dapat dilakukan dan diharapkan dapat meningkatan kekuatan dari mortar ialah dengan cara penambahan bahan alternatif berupa Silica fume dan Superplasticizerconsol SS 74 N. Digunakan variasi penambahan 0,5% Superplasticizer dan prosentase Silica fume 10% dan 20% dengan pengujian kuat tekan pada umur 7,14, dan 28 hari. Hasil penelitian menunjukkan bahwa pengaruh penambahan Silica fume dan Superplasticizer terhadap mortar berpotensi menurunkan nilai kuat tekan, dengan nilai kuat tekan maksimum pada mortar normal umur 28 hari 49,41 Mpa, sedangkan pada mortar variasi SF 10% dan 20% 37,48 Mpa dan 30,43 Mpa
Analisis Uji Bending Pada Spesimen Serat Kulit Jagung Fiberglass Dengan Perpaduan Resin Lycal Menggunakan Variasi Metode Pembuatan Vacuum Bagging Dan Vacuum Infusion
Full text linkThis research aims to analyze the bending strength of composite materials based on corn fiber and fiberglass with Lycal resin, which are produced using two methods, namely vacuum bagging and vacuum infusion.Composite materials are increasingly being used in various industries because of their light and strong haracteristics. In this research, corn fiber was chosen as a natural reinforcement material because of its abundant availability and economic potential, while fiberglass was used as additional reinforcement to increase the strength of the material.The composite manufacturing process is carried out using two different methods, namely vacuum bagging and vacuum infusion, which are then tested using the ASTM-D 790 standard to determine the mechanical characteristics of the material, especially in terms of its ability to withstand bending loads. Apart from the bending test, material density calculations were also carried out to compare the weight and density of the two manufacturing methods.The test results show that the vacuum infusion method producescomposites with higher flexural strength than vacuum bagging. This is caused by a more even distribution of resin and minimal air trapped in the material structure during the vacuum infusion process. The composite produced from this method also has a lower density, making it lighter but still mechanically strong.It is hoped that this research can contribute to the development of natural fiber-based composite materials that are environmentally friendly and efficient, and have the potential to be applied to the aerospace industry, especially in the manufacture of UAV structuresPenelitian ini bertujuan untuk menganalisis kekuatan lentur (bending strength) dari material komposit berbasis serat jagung dan fiberglass dengan resin Lycal, yang diproduksi menggunakan dua metode, yaitu vacuum bagging dan vacuum infusion. Material komposit semakin banyak digunakan di berbagai industri karena karakteristiknya yang ringan dan kuat. Dalam penelitian ini, serat jagung dipilih sebagai bahan penguat alami karena ketersediaannya yang melimpah dan potensi ekonomisnya, sementara fiberglass digunakan sebagai penguat tambahan untuk meningkatkan kekuatan material.Proses pembuatan komposit dilakukan dengan dua metode berbeda, yaitu vacuum bagging dan vacuum infusion, yang kemudian diuji menggunakan standar ASTM-D 790 untuk mengetahui karakteristik mekanis material, khususnya dalam hal kemampuan menahan beban lentur. Selain uji bending, dilakukan juga perhitungan densitas material untuk membandingkan berat dan kepadatan dari kedua metode pembuatan tersebut.Hasil pengujian menunjukkan bahwa metode vacuum infusion menghasilkan komposit dengan kekuatan lentur yang lebih tinggi dibandingkan vacuum bagging. Hal ini disebabkan oleh distribusi resin yang lebih merata dan minimnya udara yang terperangkap dalam struktur material pada proses vacuum infusion. Komposit yang dihasilkan dari metode ini juga memiliki densitas yang lebih rendah, menjadikannya lebih ringan namun tetap kuat secara mekanis.Penelitian ini diharapkan dapat memberikan kontribusi bagi pengembangan material komposit berbasis serat alami yang ramah lingkungan dan efisien, serta memiliki potensi untuk diterapkan pada industri dirgantara, khususnya dalam pembuatan struktur UAV
Application of Bagging and Boosting Methods for Heart Disease Classification
Full text linkCardiovascular disease remains a primary contributor to global mortality, underscoring the urgent need for accurate and early diagnostic tools. This study aims to develop a robust classification model for heart disease by conducting a comparative analysis of six ensemble machine learning algorithms, comprising three from the Bagging family (Random Forest, Bagged Decision Tree, Extra Trees) and three from the Boosting family (AdaBoost, Gradient Boosting, XGBoost). The research utilizes the publicly available UCI Cleveland Heart Disease dataset, which exhibits a mild class imbalance. To address this, the Synthetic Minority Over-sampling Technique (SMOTE) was strategically applied to the training data. The performance of each model was rigorously evaluated using accuracy, precision, recall, and F1-score. Experimental results revealed that the Extra Trees algorithm, when combined with SMOTE, achieved the highest overall performance with 90% accuracy, 96% precision, 82% recall, and an 88% F1-score. The primary contribution of this work lies in its comprehensive analysis demonstrating that the randomization strategy of Extra Trees provides a superior and more reliable framework for this classification task compared to other common ensemble techniques, particularly after data balancing. These findings confirm that an integrated approach of ensemble learning and proper data balancing can significantly enhance the development of fair and effective diagnostic tools to support medical professionals
Evaluasi Pengaruh Kualitas Website Kampung Kopo terhadap Kepuasan Pengguna Menggunakan Model WebQual 4.0
Full text linkThis study evaluates the quality of the Kampung Kopo website using the WebQual 4.0 model, which comprises three dimensions: usability, information quality, and interaction quality. A quantitative survey was conducted with 109 purposively selected respondents, and data were analyzed using multiple linear regression. Descriptive results showed that usability (4.03) and information quality (4.03) received high scores, while user satisfaction was moderate (3.41). Regression analysis revealed that all three dimensions significantly influenced satisfaction: interaction quality (β = 0.401; p < 0.001), information quality (β = 0.345; p < 0.001), and usability (β = 0.306; p < 0.001). The model was significant (F = 308.281; p < 0.001) and explained 89.8% of satisfaction variance (R² = 0.898). These findings confirm that while interaction quality has the strongest effect, all three dimensions play essential roles in determining user satisfaction. Village websites should adopt a comprehensive approach to improve usability, information quality, and interaction quality simultaneously to strengthen digital transformation at the village level
Perkuatan Tanah Gambut Ambarawa dengan Cerucuk Menggunakan Pemodelan Finite Element Method
Full text linkPeat soils, which are mainly composed of semi-decayed plant remains, usually have high compressibility and low bearing capacity. The high compressibility and low bearing capacity mean that peat soil must be improved if construction is to be built on it. Research was conducted to find a method for soil improvement. Improvements were made by reinforcing the peat with bamboo stakes using the finite element method modeling. In the results of modeling and calculations using software based on the finite element method, the Ambarawa peat soil, before reinforcement with a bamboo stakes at a 5-day time interval, obtained a total deformation value of 7.18 m. After a 5-day interval, the soil collapsed due to its low bearing capacity, preventing further calculations and leaving the safety number unknown. In the Ambarawa peat soil after reinforcement with a bamboo stakes planned 8 m long bamboo stakes and a distance of 1 m between bamboo stakes based on calculations using finite element method modeling at a time interval of 5 days, the total deformation value was obtained at 3.98 m, a time interval of 10 days at 4.46 m, a time interval of 15 days at 4.46 m. Based on the known deformation value, the maximum safety value of this modeling was obtained at a time interval of 30 days, with a value of 1.173.Tanah gambut dimana pembentuk utamanya dari sisa-sisa tumbuhan setengah membusuk, biasanya memiliki kompresibilitas tinggi dan daya dukung rendah. Nilai kompresibilitas yang tinggi dan daya dukung yang rendah mengakibatkan tanah gambut harus diperbaiki jika ingin dibangun konstruksi diatasnya. Sehingga penelitian dilakukan untuk mendapatkan metode perbaikan tanah. Perbaikan dengan melakukan perkuataan dengan cerucuk menggunakan pemodelan finite element method. Dalam hasil pemodelan dan perhitungan menggunakan software berbasis finite element method tanah gambut Ambarawa sebelum dilakukan perkuatan dengan cerucuk pada interval waktu 5 hari didapatkan nilai deformasi total sebesar 7,18 m. Pada interval waktu 5 hari tanah mengalami runtuh (collapse) dikarenakan daya dukung tanah yang kecil sehingga perhitungan tidak dapat dilanjutkan dan nilai angka keamanan tidak dapat diketahui. Pada tanah gambut Ambarawa setelah dilakukan perkuatan dengan cerucuk yang direncanakan panjang cerucuk 8 m dan jarak antar cerucuk 1 m berdasarkan perhitungan menggunakan pemodelan finite element method pada interval waktu 5 hari didapatkan nilai deformasi total sebesar 3,98 m, interval waktu 10 hari sebesar 4,46 m, interval waktu 15 hari sebesar 4,46 m. Berdasarkan nilai deformasi yang telah diketahui nilai angka keamanan maksimal pemodelan ini diperoleh pada interval waktu 30 hari sebesar 1,173
Analisa Produktivitas Tiang Menggunakan Alat Pancang Diesel Hammer Pada Proyek Pembangunan Gedung Kantor Pengadilan Agama Dataran Hunipopu
Full text linkThe pile driving process is a crucial stage in foundation construction, ensuring the stability and strength of the building structure. Piling can be done with various types of tools, one of which is a diesel hammer. Diesel hammers are renowned for delivering significant impact energy to piles, enabling effective and efficient soil penetration. The purpose of this research is to determine the cycle time of the piling process and to determine the productivity of piling using diesel hammer tools. The method used in this research is direct observation in the field. The results obtained from the research were the average cycle time in the piling process using a diesel hammer piling tool at 101 points for 16 days, which was 50.35 minutes during normal working hours and 59.94 minutes during overtime. The productivity of the diesel hammer on the work of the Religious Court Office Building was the lowest on the first day, with a productivity value of 10.48 m/hour, and the highest occurred on day fifteen, with a productivity value of 17.25 m/hour. During overtime working hours, the highest productivity was recorded on the fifteenth day at 16.71 m/hour, while the lowest was on the first day at 4.01 m/hour.Proses pemancangan tiang pancang merupakan tahap penting dalam konstruksi fondasi, yang berfungsi untuk memastikan stabilitas dan kekuatan struktur bangunan. Pemancangan tiang dapat dilakukan dengan berbagai jenis alat, salah satunya adalah diesel hammer. Diesel Hammer dikenal karena kemampuannya memberikan energi tumbukan yang besar pada tiang pancang, memungkinkan tiang untuk menembus tanah dengan efektif dan efisien. Tujuan dari penelitian ini adalah mengetahui waktu siklus proses pemancangan dan mengetahui produktivitas pemancangan menggunakan alat diesel hammer. Metode yang digunakan dalam penelitian ini adalah observasi langsung ke lapangan. Hasil yang didapat dari penelitian adalah waktu siklus rata-rata pada proses pemancangan dengan menggunakan alat pancang diesel hammer pada 101 titik selama 16 hari adalah 50,35 menit pada jam kerja normal dan 59,94 menit pada waktu lembur. Produktivitas diesel hammer pada pekerjaan Gedung Kantor Pengadilan Agama paling rendah terjadi pada hari pertama dengan nilai produktivitas sebesar 10,48 m/jam dan yang paling tinggi terjadi pada hari ke lima belas dengan nilai produktivitas sebesar 17,25 m/jam. Sedangkan pada jam kerja lembur produktivitas paling tinggi terjadi pada hari ke lima belas yaitu sebesar 16,71 m/jam dan yang paling rendah pada hari pertama yaitu sebesar 4,01 m/jam