Online Journals Universitas Kristen Indonesia
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DETEKSI TUMPAHAN MINYAK MENGGUNAKAN METODE ADAPTIVE THRESHOLD PADA CITRA SATELIT SENTINEL-1A DI PERAIRAN UTARA KARAWANG
Full text linkThe North Karawang Waters are one of the waters crossed by the Indonesian Archipelago Sea Lane (ALKI) where large ships and tankers cross this water area. In the northern part of the Karawang Waters, there are also oil and gas drilling activities belonging to one of the national oil and gas companies, so there is a high risk of oil spill disasters. On April 22, 2021, there was an underwater oil pipeline leak around the oil well area operated by PT Pertamina Hulu Energi Offshore North West Java (PHE ONWJ). This study aims to analyze the distribution of oil spills using the Sentinel 1A Synthetic Aperture Radar (SAR). The research location includes the Karawang Waters where there has been an oil spill case. The method used to detect oil spills from Sentinel-1A satellite imagery is the adaptive threshold. The stages carried out for satellite image processing are image correction such as radiometric calibration, multilooking, filtering and dark spot detection using an adaptive threshold. Wind direction and speed data are used to see the movement of the oil spill area. The results of the study show that SAR Sentinel 1A imagery provides good enough information to detect oil spills and their distribution in the waters north of Karawang.Perairan Utara Karawang merupakan salah satu perairan yang dilintasi Alur Laut Kepulauan Indonesia (ALKI) dimana kapal-kapal besar dan kapal tanker melintasi area perairan ini. Di bagian Utara Perairan Karawang juga terdapat kegiatan pengeboran minyak dan gas (migas) milik salah satu perusahaan minyak dan gas nasional, sehingga beresiko yang tinggi terhadap bencana tumpahan minyak. Pada tanggal 22 April 2021, terjadi kebocoran pipa minyak bawah laut di sekitar area sumur minyak yang dioperasikan PT Pertamina Hulu Energi Offshore North West Java (PHE ONWJ). Penelitian ini bertujuan untuk menganalisis distribusi tumpahan minyak menggunakan Synthetic Aperture Radar (SAR) Sentinel 1A. Lokasi penelitian meliputi Perairan Karawang yang pernah terjadi kasus tumpahan minyak. Metode yang digunakan untuk mendeteksi tumpahan minyak dari citra satelit Sentinel-1A adalah dengan adaptive threshold. Tahapan yang dilakukan untuk pengolahan citra satelit adalah koreksi citra seperti kalibrasi radiometrik, multilooking, filtering dan deteksi dark spot dengan menggunakan adaptive threshold. Data arah dan kecepatan angin yang digunakan untuk melihat pergerakan area tumpahan minyak. Hasil kajian menunjukkan bahwa citra SAR Sentinel 1A memberikan informasi yang cukup baik untuk mendeteksi tumpahan minyak dan distribusinya di perairan Utara Karawang
PENGARUH PENGINJEKSIAN GAS OXY HYDROGEN (HHO) TERHADAP KONSUMSI BAHAN BAKAR PADA MOTOR MATIC MELALUI PROSES ELEKTOLISIS ASAM SULFAT (H2SO4) DAN KALIUM HIDROKSIDA (KOH)
No full textThis study aims to analyze the effect of adding HHO gas on fuel consumption in automatic motorcycles. HHO gas is produced through an electrolysis process using KOH and H₂SO₄ solutions, then delivered into the combustion chamber to support a more efficient combustion process. The testing was carried out under two conditions: stationary and operational. The results showed that the addition of HHO gas significantly reduced fuel consumption, with an average saving of 67.99% under operational conditions and 66.22% under stationary conditions. The electrolysis process used in this study was proven effective in generating HHO gas, which contributes to improving combustion quality. The average power consumption of the HHO generator was recorded at 8.41 Watts during operation and 8.95 Watts during stationary conditions. Meanwhile, the power supplied from the battery to the HHO system was 54.06 Watts during operational mode and 50 Watts during stationary mode. The generator only consumed approximately 15% of the battery capacity in operational conditions and 17% in stationary conditions. These results indicate that the HHO system can operate efficiently without placing an excessive load on the vehicle’s electrical system and has potential as an energy-saving solution for gasoline-powered vehicles.
Keywords: HHO, automatic motorcycle, combustion, fuel consumption, electrolysisPenelitian ini bertujuan untuk menganaalisis pengaruh penambahan gas HHO terhadap konsumsi bahan bakar pada sepeda motor matic. Gas HHO dihasilkan melalui proses elektrolisis menggunakan larutan KOH dan H₂SO₄, kemudian dialirkan ke ruang bakar untuk membantu proses pembakaran agar lebih efisien. Pengujian dilakukan dalam dua kondisi, yaitu saat kendaraan dalam keadaan stasioner dan saat operasional. Hasil menunjukkan bahwa penambahan gas HHO mampu menurunkan konsumsi bahan bakar secara signifikan, dengan rata-rata penghematan sebesar 67,99% pada kondisi operasional dan 66,22% pada kondisi stasioner. Proses elektrolisis yang digunakan terbukti efektif dalam menghasilkan gas HHO, yang berperan meningkatkan kualitas pembakaran. Konsumsi daya oleh generator HHO tercatat rata-rata sebesar 8,41 Watt saat operasional dan 8,95 Watt saat stasioner. Sedangkan daya yang disuplai dari baterai ke sistem HHO sebesar 54,06 Watt saat operasional dan 50 Watt saat stasioner. Konsumsi daya generator hanya sekitar 15% dari kapasitas daya baterai pada kondisi operasional dan 17% pada kondisi stasioner, Hal ini menunjukkan bahwa sistem HHO dapat berfungsi secara efisien tanpa memberikan beban berlebih pada sistem kelistrikan kendaraan, serta berpotensi sebagai solusi hemat energi untuk kendaraan berbahan bakar bensin..
Kata Kunci: HHO, motor matic, pembakaran, konsumsi bahan bakar, elektrolisi
Design-Based Learning Activity and Self-Regulation in Education: A Review
Full text linkDesign-based learning has been widely recognized for its impact on the cognitive domain within educational settings. However, limited research has explored the interaction between design processes and students\u27 self-regulation. This paper reviews 15 relevant studies to investigate the relationship between these two constructs. Findings suggest that design-based learning implemented through activities, projects, or problem-based tasks, fosters a complex, dynamic, and mutually reinforcing relationship with self-regulation. This interaction appears particularly robust in both science-oriented and art-related educational contexts. The review highlights overlapping cognitive and metacognitive elements that may influence this relationship. Further empirical research is needed to examine how self-regulation and design processes operate in practical pedagogical environments
Redefining Academic Recruitment Using Fuzzy Tahani Logic: A Multi-Criteria Model for Calculus Teaching Assistants’ Selection
Full text linkThis study aims to implement the Tahani fuzzy logic method as a decision support system for selecting candidates to become teaching assistants in a Calculus course. The selection process involves evaluating participants based on four test items covering major topics in Calculus: definite integrals, areas between curves, and others. Each participant’s score was fuzzified into three linguistic categories: poor, fair, and good. Membership functions were constructed using triangular distributions, and fuzzified scores were processed using a rule-based inference system. The final recommendation score for each participant was obtained by defuzzifying the fuzzy outputs. Participants with a final score recommendation greater than or equal to 0.5 were classified as eligible. The results show that the fuzzy logic approach offers a flexible and effective way to handle uncertainties in assessment, with 8 participants meeting the passing criteria. This method provides an objective framework for decision-making in academic selection contexts
Teratai (Nelumbo nucifera Gaertn.): Botani, Potensi Pemanfaatan, dan Metabolit Sekunder
Full text linkNelumbo nucifera Gaertn is one of the aquatic plants used for food, medicine, culture, and religion. This study aims to explain the botany, utilization, bioactivity, and secondary metabolites of N. nucifera. This study is based on a literature review published online using the keywords N. nucifera, uses of N. nucifera, and bioactivity of N. nucifera. Data analysis was carried out qualitatively to describe the botany, utilization, and secondary metabolites of N. nucifera. In taxonomy, N. nucifera is grouped in the Nelumbonaceae family. N. nucifera is a perennial aquatic plant with a rhizome stem and a single, round leaf with large pink or white flower petals. In traditional medicine, N. nucifera is used to treat various diseases such as inflammation, insomnia, cardiovascular issues, hyperlipidemia, nervous disorders, emollient and diuretic effects, diarrhoea, dyspepsia, hematuria, fever, epilepsy, hypertension, and obesity. N. nucifera bioactivity as an antioxidant, anti-cancer/tumor, neuroprotective, anti-inflammatory, increases sperm motility, anti-diabetes mellitus, and skin whitener. Lotus has flowers, seeds, leaves, fruits, and rhizomes that can be eaten because they have more carbohydrates, proteins, and vitamins. Alkaloids, polyphenols, terpenoids, steroids, and glycosides are responsible for its various biological and pharmacological activities. The potential for utilizing N. nucifera for food diversification, vegetable protein sources, and skin whitening needs to be studied further.Nelumbo nucifera Gaertn is one of the aquatic plants used for food, medicine, culture, and religion. This study aims to explain the botany, utilization, bioactivity, and secondary metabolites of N. nucifera. This study is based on a literature review published online using the keywords N. nucifera, uses of N. nucifera, and bioactivity of N. nucifera. Data analysis was carried out qualitatively to describe the botany, utilization, and secondary metabolites of N. nucifera. In taxonomy, N. nucifera is grouped in the Nelumbonaceae family. N. nucifera is a perennial aquatic plant with a rhizome stem and a single, round leaf with large pink or white flower petals. In traditional medicine, N. nucifera is used to treat various diseases such as inflammation, insomnia, cardiovascular issues, hyperlipidemia, nervous disorders, emollient and diuretic effects, diarrhoea, dyspepsia, hematuria, fever, epilepsy, hypertension, and obesity. N. nucifera bioactivity as an antioxidant, anti-cancer/tumor, neuroprotective, anti-inflammatory, increases sperm motility, anti-diabetes mellitus, and skin whitener. Lotus has flowers, seeds, leaves, fruits, and rhizomes that can be eaten because they have more carbohydrates, proteins, and vitamins. Alkaloids, polyphenols, terpenoids, steroids, and glycosides are responsible for its various biological and pharmacological activities. The potential for utilizing N. nucifera for food diversification, vegetable protein sources, and skin whitening needs to be studied further
Keragaman Serangga yang Terperangkap pada Cairan Beberapa Spesies Kantong Semar (Nepenthes spp.) di Kota Subulussalam, Provinsi Aceh
Full text linkSubulussalam City has an area consisting of residential, plantation, and forest. This condition affects the diversity and distribution of flora and fauna. One of the floras in Subulussalam City is Nepenthes spp., which has the unique ability to trap insects. The species of Nepenthes that have been found in Subulussalam City are N. ampularia, N. gracilis, N. mirabilis, and N. reindwardtiana. There are several insects trapped in the Nepenthes pouch, but the species is not yet known. Therefore, it is necessary to conduct a study on the diversity of insects trapped in the Nepenthes pouch in the Sultan Daulat Forest Area. The purpose of this study was to determine the species of insects trapped in the liquid of Nepenthes spp. in Sultan Daulat District, Subulussalam City. Data collection in the research area was conducted by exploring 1 km along the border road of Pulo Kedep Village and Sepadan Village. The purposive sampling method involved observing the presence of Nepenthes by walking. If Nepenthes is found at the research location, documentation is carried out on it. Then, the liquid from the upper and lower bags of Nepenthes is poured into separate plastic bags, labeled, and the data is recorded. The study identified 22 insect species, comprising 20 genera, 10 families, and four orders, with the most common order being Hymenoptera.Subulussalam City has an area consisting of residential, plantation, and forest. This condition affects the diversity and distribution of flora and fauna. One of the floras in Subulussalam City is Nepenthes spp., which has the unique ability to trap insects. The species of Nepenthes that have been found in Subulussalam City are N. ampularia, N. gracilis, N. mirabilis, and N. reindwardtiana. There are several insects trapped in the Nepenthes pouch, but the species is not yet known. Therefore, it is necessary to conduct a study on the diversity of insects trapped in the Nepenthes pouch in the Sultan Daulat Forest Area. The purpose of this study was to determine the species of insects trapped in the liquid of Nepenthes spp. in Sultan Daulat District, Subulussalam City. Data collection in the research area was conducted by exploring 1 km along the border road of Pulo Kedep Village and Sepadan Village. The purposive sampling method involved observing the presence of Nepenthes by walking. If Nepenthes is found at the research location, documentation is carried out on it. Then, the liquid from the upper and lower bags of Nepenthes is poured into separate plastic bags, labeled, and the data is recorded. The study identified 22 insect species, comprising 20 genera, 10 families, and four orders, with the most common order being Hymenoptera
Identification of Salmonella spp. Bacteria in Fishery Products at the Testing Laboratory of the Marine and Fishery Products Quality Control and Supervision Agency (BPPMHKP) Surabaya II
Full text linkFish is a crucial source of animal protein and a primary commodity in the fisheries industry. Fishery products include fresh fish and frozen fish. Fish is a type of food that is susceptible to biological damage and decay. One of the causes of spoilage and microbial contamination in fishery products by pathogenic bacteria is Salmonella spp. The purpose of this study was to determine the results of the identification of Salmonella spp. in fishery products at the Testing Laboratory of the Fisheries Product Quality Control and Supervision Agency (BPPMHKP) Surabaya II. This study employed the SNI ISO 6579-1:2017 reference method and was analyzed descriptively to determine the presence of Salmonella spp.. Based on the identification results, out of the four samples tested, only one sample was positive for Salmonella spp., namely dried himego products.Fish is a crucial source of animal protein and a primary commodity in the fisheries industry. Fishery products include fresh fish and frozen fish. Fish is a type of food that is susceptible to biological damage and decay. One of the causes of spoilage and microbial contamination in fishery products by pathogenic bacteria is Salmonella spp. The purpose of this study was to determine the results of the identification of Salmonella spp. in fishery products at the Testing Laboratory of the Fisheries Product Quality Control and Supervision Agency (BPPMHKP) Surabaya II. This study employed the SNI ISO 6579-1:2017 reference method and was analyzed descriptively to determine the presence of Salmonella spp.. Based on the identification results, out of the four samples tested, only one sample was positive for Salmonella spp., namely dried himego products
ANALISIS DAN PENGGUNAAN SIMULASI MONTE CARLO DALAM PENGAMBILAN KEPUTUSAN: THE ANALYSIS AND USE OF MONTE CARLO SIMULATION IN DECISION MAKING
Full text linkA Monte Carlo simulation is a tool to predict different outcomes and probabilities using random variables. This method is often used to solve complex problems that have a lot of risks and uncertainties. This article uses qualitative descriptive research that integrates past significant studies in order to provide an understanding in the effectiveness during a decision-making process. The Monte Carlo simulation has four stages, where it creates a distribution for the variables needed, then each variable has their own cumulative probability range, then determines the random number interval for each variable and generates random numbers, and finally analyzes the outputs to identify the range of possible outcomes and possibilities. Ultimately, this simulation can assess risks, predict forecasts based on uncertain factors, optimize models by simulating different scenarios, as well as conduct complex analysis. Due to its capability, the Monte Carlo simulation is often used by many when making a decision about investment, business, or when optimizing supply chains and logistics. Therefore, the goal of this article is to explain when to appropriately use the Monte Carlo simulation based on the complexity and characteristics of the problem at hand.
Keywords: Monte Carlo simulation, decision making, probabilit
Future Marketing Classroom: Transformasi Metode Pembelajaran Manajemen Pemasaran Melalui Canva
Full text linkThe advancement of digital technology brought significant changes to teaching methods in higher education, particularly through the increasing use of technology-based media such as Learning Management Systems (LMS), instructional videos, and interactive graphic design applications. However, at Pattimura University, the integration of technology into teaching still faced various challenges, especially related to lecturers’ skills in designing engaging and effective digital content. To address this issue, a Community Service Program (PkM) was carried out at the Faculty of Economics and Business, which aimed to enhance lecturers’ competencies in developing instructional videos using the Canva application. The program was implemented through socialization, training, hands-on workshops, and discussion sessions that involved lecturers from the Department of Management, particularly those in the Marketing concentration. The evaluation results showed a significant improvement in lecturers’ ability to utilize Canva for creating interactive slides and instructional videos. This program successfully contributed to improving the quality of teaching, making it more aligned with the needs of students in the digital era. Furthermore, it strengthened the capacity of lecturers in Eastern Indonesia to integrate technology into education, thereby opening opportunities for more creative, collaborative, and relevant teaching practices in line with technological developments.Perkembangan teknologi digital telah membawa perubahan signifikan dalam metode pembelajaran di perguruan tinggi, dengan semakin banyaknya penggunaan media berbasis teknologi seperti Learning Management System (LMS), video pembelajaran, dan aplikasi desain grafis interaktif. Namun, di Universitas Pattimura, penerapan teknologi dalam pembelajaran masih menghadapi berbagai kendala, terutama terkait keterampilan dosen dalam merancang konten digital yang menarik dan efektif. Untuk itu, kegiatan Pengabdian kepada Masyarakat (PkM) di Fakultas Ekonomi dan Bisnis Unpatti bertujuan meningkatkan keterampilan dosen dalam membuat video pembelajaran menggunakan aplikasi Canva. Kegiatan ini dilakukan melalui sosialisasi, pelatihan, workshop praktik, dan diskusi yang melibatkan dosen dari Jurusan Manajemen, khususnya konsentrasi Pemasaran. Hasil evaluasi menunjukkan adanya peningkatan keterampilan yang signifikan dalam penggunaan Canva untuk pembuatan slide interaktif dan video pembelajaran. Kegiatan ini berhasil memberikan kontribusi dalam meningkatkan kualitas pembelajaran yang lebih sesuai dengan kebutuhan mahasiswa di era digital. Selain itu, kegiatan ini juga memperkuat kapasitas dosen di wilayah timur Indonesia untuk mengintegrasikan teknologi dalam pendidikan, membuka peluang bagi pengembangan pembelajaran yang lebih kreatif, kolaboratif, dan relevan dengan perkembangan teknologi masa kini
Risk Management Analysis on Twitch Application Use with Failure Mode Effect Analysis Method Based on Data Scraping and Interviews
No full textThis study examines risk management in the use of the Twitch application using the Failure Mode and Effect Analysis (FMEA) method based on scraping data. The main issue raised is the identification and evaluation of significant risks that can affect the operation and security of the Twitch application, including data security, user privacy, cyberattacks, and technical issues that can disrupt streaming services. The purpose of this study is to determine effective mitigation measures to reduce the impact of these risks. The method used is FMEA with assessment using a Risk Priority Number (RPN) to identify risks that require immediate attention and action. The results show that some risks have a high level of priority and require the implementation of strict security policies, the use of data encryption, two-factor authentication, and better infrastructure management. The conclusion of this study emphasizes the importance of effective risk management and the implementation of information security standards such as ISO 27001:2022 to improve the security and reliability of the system, as well as protect user data and privacy, so as to ensure a safe and smooth user experience in using the Twitch platformThis study examines risk management in the use of the Twitch application using the Failure Mode and Effect Analysis (FMEA) method based on scraping data. The main issue raised is the identification and evaluation of significant risks that can affect the operation and security of the Twitch application, including data security, user privacy, cyberattacks, and technical issues that can disrupt streaming services. The purpose of this study is to determine effective mitigation measures to reduce the impact of these risks. The method used is FMEA with assessment using a Risk Priority Number (RPN) to identify risks that require immediate attention and action. The results show that some risks have a high level of priority and require the implementation of strict security policies, the use of data encryption, two-factor authentication, and better infrastructure management. The conclusion of this study emphasizes the importance of effective risk management and the implementation of information security standards such as ISO 27001:2022 to improve the security and reliability of the system, as well as protect user data and privacy, so as to ensure a safe and smooth user experience in using the Twitch platfor