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All Journal Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Jurnal Dimensi Pratama Teknik Sipil Jurnal Ilmu Nutrisi dan Teknologi Pakan Jurnal Sistem Informasi Jurnal TAM (Technology Acceptance Model)
Kevin Alexander, Kevin
Mahasiswa Program Studi Teknik Sipil Universitas Kristen Petra
Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering

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ANALISA KARAKTERISTIK DAN APLIKASI CAMPURAN ASPAL EMULSI DINGIN DENGAN SPESIFIKASI CAMPURAN ASPAL PANAS Alexander, Kevin; Prasetyo, Timotius; Wulandari, Paravita Sri; Patmadjaja, Harry
Jurnal Dimensi Pratama Teknik Sipil Vol 5, No 1 (2016)
Publisher : Jurnal Dimensi Pratama Teknik Sipil

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (78.005 KB)

Abstract

Jenis perkerasan lentur yang digunakan di Indonesia pada umumnya menggunakan campuran aspal panas. Adapun jenis-jenis campuran aspal panas tersebut antara lain: Lapis Aspal Beton (Laston) atau AC (Asphalt Concrete), Lapis Tipis Aspal Beton (Lataston) atau HRS (Hot Rolled Sheets) dan Lapis Tipis Aspal Pasir (Latasir). Mulai sekitar tahun 1990-an untuk pekerjaan jalan di Indonesia mulai dipergunakan jenis aspal lain yaitu aspal emulsi. Penelitian ini bertujuan untuk mengetahui Kadar Aspal Residu Optimum (KARO) dan karakteristik Campuran Aspal Emulsi Dingin (CAED) jika gradasinya mempergunakan spesifikasi campuran beraspal panas dengan membandingkan campuran aspal panas dan campuran aspal dingin. Agregat yang digunakan dalam penelitian ini berasal dari Pandaan, sedangkan aspal yang digunakan yaitu aspal emulsi dingin type css-1h dan aspal panas Pen.60-70. Variasi kadar aspal yang digunakan yaitu : 5%, 5.5%, 6%, 6.5%, dan 7%. Untuk mendapatkan nilai kadar aspal optimum dilakukan pengujian Marshall dengan parameter yaitu stabilitas, flow, VIM, dan VMA. Hasil yang diperoleh pada KARO 7% yaitu nilai stabilitas sebesar 1075.310 kg, nilai VIM 7.36%, nilai VMA 20.74% dan nilai flow 3.98%. Dengan nilai parameter yang didapatkan maka campuran aspal emulsi dingin dengan spesifikasi campuran aspal panas memenuhi syarat spesifikasi parameter untuk campuran beraspal lalu lintas berat yaitu campuran laston.
APLIKASI GEOSPASIAL MENGGUNAKAN ARCGIS 10.3 DALAM PEMBUATAN PETA DAYA HANTAR LISTRIK DI CEKUNGAN AIRTANAH SUMOWONO Putranto, Thomas Triadi; Alexander, Kevin
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 14, No 1 (2017): Maret 2017
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (340.252 KB) | DOI: 10.14710/presipitasi.v14i1.15-23

Abstract

Air tanah sebagai air bersih merupakan salah satu kebutuhan primer manusia yang dimanfaatkan dalam berbagai kepentingan manusia serta untuk air minum. Airtanah memiliki kualitas dimana salah satu parameter fisiknya adalah daya hantar listrik (DHL). Dalam suatu Cekungan Airtanah (CAT), airtanah memiliki keberagaman nilai daya hantar listrik yang dipengaruhi oleh faktor infiltrasi dan lingkungan. Nilai DHL dapat dijadikan suatu acuan mengenai kelayakan suatu airtanah sebagai air minum. Sebagai salah satu sumber yang paling diminati masyarakat, maka masyarakat juga perlu untuk mengetahui kualitas dari airtanah tersebut melalui parameter daya hantar listrik sehingga peta daya hantar listrik daerah CAT Sumowono dapat menjadi suatu informasi bagi masyarakat yang menggunakan airtanah dari CAT Sumowono tersebut. Maka dari itu perlu adanya pembuatan peta daya hantar listrik daerah CAT Sumowono agar masyarakat merasa nyaman dan aman dalam memanfaatkan airtanah. Metode interpolasi data DHL menggunakan analisis geostatistik yang terdapat pada perangkat lunak ArcGIS 10.3. Metode interpolasi yang digunakan adalah Inverse Distance Weighting (IDW), Radial Basis Functions (RBF) dan Empirical Bayesian Kriging (EBK). Dari keseluruhan data yang terinterpolasi, didapatkan dua kelas kualitas airtanah berdasarkan nilai DHL, yaitu Sangat Baik (<250 μS/cm) dan Baik (250-750 μS/cm). Metode interpolasi yang dinilai paling seimbang adalah metode RBF. Melalui peta DHL hasil interpolasi metode RBF diketahui persebaran daerah dengan kelas sangat baik pada daerah CAT Sumowono mencakup 52,8% dari luas CAT dan 47,2% masuk ke dalam kelas baik.
Evaluasi Efisiensi Kerja Mesin Chopper dengan Integrasi Bagging Scale dan Conveyor pada Produksi Pakan Hijauan di Peternakan PT.X: Evaluation of Forage Feed Production and Work Posture After Chopper Machine Modification at PT. X Farm Ridwan, Habibi; Apri Astuti, Dewi; Jakaria; Alexander, Kevin
Jurnal Ilmu Nutrisi dan Teknologi Pakan Vol. 23 No. 2 (2025): Jurnal Ilmu Nutrisi dan Teknologi Pakan
Publisher : Departemen Ilmu Nutrisi dan Teknologi Pakan Fakultas Peternakan Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jintp.23.2.103-109

Abstract

Conventional chopper machines in farms such as PT. X often faces limitations in capacity and a lack of ergonomic design for operators. Modernization of the machine, including modifications in design and motor, is expected to improve production capacity and operator comfort. This study aims to assess the effect of chopper machine modification on improving production efficiency and operator ergonomics. Data was collected through direct field practice, observation, documentation, and interviews. The data obtained for evaluating machine capacity were analysed using the Paired T-Test, while comparative variables such as machine design, forage cutting percentage, and rapid entire body assessment (REBA) were analyzed descriptively. The results showed that modifications to the chopper machine at PT. X had a significant impact on increasing operational efficiency and reducing ergonomic risks for operators. Machine working capacity increased by 91.28%, from 1,079.32 kg hour-1 to 2,064.50 kg hour-1, accompanied by a reduction in total chopping cycle time from 66.79 seconds to 34.90 seconds. Although idle time slightly increased due to changes in the number of operators, work efficiency still showed substantial improvement through the integration of semi-automatic systems (bagging scale and conveyor). From an ergonomic perspective, posture analysis using the REBA method indicated a reduction in risk level from medium (score 7) before modification to low (score 3) after modification. In conclusion, modifications to the chopper machine at PT. X significantly increased operational efficiency, with a production capacity increase of up to 91.28% and a reduction in cycle time. Ergonomic evaluation showed a decrease in posture-related risk from medium to low. These findings demonstrate that the modifications not only accelerated the production process but also enhanced operator comfort and safety. Key words: bagging scales, chopper machine, conveyor, ergonomic evaluation, forage production
QRIS ACCEPTANCE COMPARISON BETWEEN BATAM CITY AND SAMPIT CITY Pratama, Jimmy; Alexander, Kevin; Simanjuntak, Fredian
Jurnal TAM (Technology Acceptance Model) Vol 14, No 2 (2023): Jurnal TAM (Technology Acceptance Model)
Publisher : Institut Bakti Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56327/jurnaltam.v14i2.1629

Abstract

The emergence of digital payment technology services or Quick Response Code Indonesian Standard (QRIS) digital transactions has brought rapid changes to the way we as a society transact. This research aims to find out what influences or factors make people use QRIS, especially in Batam City and Sampit City, by applying the Technology Acceptance Model (TAM) research model. This research uses a quantitative approach method and uses the SPSS 25 system to analyze the data that has been obtained, and the variables used are Perceived Ease of Use, Perceived Usefulness, System Quality, Information Quality, Service Quality, these variables will be tested against the variables User Satisfaction to find out what factors influence customer satisfaction using QRIS. This research shows differences in results and public perceptions between the two cities, but also similarities in understanding of the advantages of QRIS. There for we can conclude that two different cities have a different perspective.
Factor Analysis of Practical Cybersecurity Learning Through Gamified Visual Novel Platform Alexander, Kevin; Syalim, Amril
Jurnal Sistem Informasi Vol. 22 No. 1 (2026): Vol. 22 No. 1 (2026): Jurnal Sistem Informasi (Journal of Information System)
Publisher : Faculty of Computer Science Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

A method of applying game elements in non-game media is known as gamification. This method is often used for learning environments to enhance learners' motivation. Gamification can be applied to any range of game genres, such as visual novel, a narrative-focused game that needs the user to interact and engage. In this research, ARCS (Attention, Relevance, Confidence, Satisfaction) questionnaire was employed to identify key factors that affect learner motivation during practical learning activities in a course focusing on cyber security topics. The Exploratory Factor Analysis (EFA) was utilized to uncover the underlying structure that affects the students' motivation. Through factor analysis, three key factors that influence the students' motivation were found. The first factor involves the students' feelings while using the gamification platform. The second is related to the learning experience of the students. Lastly, the third pertains to how confident the students are in conducting the activities on the gamification platform.
Co-Authors DEWI APRI ASTUTI Harry Patmadjaja Jakaria Jakaria Paravita Sri Wulandari Pratama, Jimmy Ridwan, Habibi Simanjuntak, Fredian Syalim, Amril Thomas Triadi Putranto, Thomas Triadi Timotius Prasetyo, Timotius