ITB Journal
Not a member yet
5999 research outputs found
Sort by
Mitigating Flood Peak Discharge with Biopore Absorption Holes (BAH) to Reduce Surface Runoff: Case Study of the Tanralili Sub-watershed
Full text linkLand use changes in the Tanralili Sub-watershed have profoundly impacted its hydrological dynamics, leading to increased surface runoff and shorter return periods for peak flood discharges. Currently, a significant portion of the area, 75.51%, is dedicated to mixed dryland and wetland agriculture, leaving only 24.49% under forest or grass cover, which has rendered much of the land critical. This research examines the effectiveness of Biopore Absorption Holes (BAH) in mitigating flood risks by enhancing infiltration and reducing runoff. Experiments were conducted on soils with moderate permeability (0.00178 cm/s), utilizing PVC BAH units measuring 10 cm in diameter and 100 cm in length, equipped with biopores of 10 mm. These units were installed in parallel on a 0.23% slope and tested under various rainfall intensities (I2, I5, I10), determined using the Mononobe equation, while peak discharge was estimated with the Nakayasu Synthetic Unit Hydrograph (HSS Nakayasu). The results showed a 58.80% reduction in peak flood discharge and a 62.99% increase in infiltration. These findings underscore the potential of BAH as an eco-friendly solution for flood mitigation. Expanding the use of BAH on open lands is recommended to bolster watershed resilience and tackle the growing risks of flooding.
 
Performance Enhancement of Video Data Transmission in Vehicular Adhoc Networks
Full text linkThe transmission of video frames among vehicles is a crucial global requirement in current road traffic conditions. Video data in vehicles may serve passengers with information as well as entertainment and, crucially, provide the drivers with dynamic information about the traffic conditions on the road ahead, assisting in reaching their destination safely at the earliest convenience using an optimal route. Intelligent Transportation System through its subsystem Vehicular Ad-hoc Networks (VANETs) make these necessities a reality. Inter-sessions carrying video data that exhibit multi-hop scenarios are encountered in the real world when people in a place of emergency communicate with the fire station/doctors/police. In such situations, the earlier the communication can occur, the smaller the damage. This work aimed to reduce the end-to-end delay (EED) experienced in VANETs when unicasting video streams among vehicles involved in inter-sessions by considering the packet delivery ratio (PDR) as a supporting parameter. The technique Network Coding was applied in VANETs and the possible recoder behaviors were simulated. An algorithm – Dynamic Recoder Recommender (DRR) – was designed and implemented to select an appropriate recoder on the fly in a path decided by the Adhoc On-Demand Vector routing protocol. This implementation outperformed the conventional network coding in terms of EED and PDR when applied with random recoders
The Use of Naive Bayes Classifier in Sentiment Analysis at Indonesia's Super Priority Tourism Destinations Based on User Reviews
Full text linkThis study aims to develop a digital technology-based evaluation platform to support Indonesia’s super priority tourism destination (DPSP) program. The platform utilizes tourist review data obtained from Google Maps, which is processed using sentiment analysis based on the Naïve Bayes algorithm and scraping techniques. By collecting and analyzing data in real time, this research provides accurate and relevant information about tourist opinions regarding tourism destinations. The implementation of this system is expected to enhance the effectiveness of tourism destination evaluations and support data-driven decision-making. The test result shows a model accuracy of 75%, with tourist reviews classified into positive, negative, and neutral classes. Further development is recommended to add more data sources and improve model accuracy.Penelitian ini bertujuan untuk mengembangkan platform evaluasi berbasis teknologi digital untuk mendukung Program Destinasi Pariwisata Super Prioritas (DPSP) di Indonesia. Platform ini memanfaatkan data ulasan wisatawan yang diperoleh dari Google Maps melalui teknik scraping dan diolah menggunakan analisis sentiment berbasis algoritma Naïve Bayes. Dengan mengumpulkan dan menganalisis data secara real-time, penelitian ini mampu memberikan informasi yang akurat dan relevan terkait opin
Desain Asesmen Diagnostik Adaptif melalui Optimalisasi Google Form dan jMetric untuk Mendeteksi Level Kesulitan Belajar Matematika Siswa
No full textThe level of difficulty students experience in learning mathematics can help teachers design learning activities that are appropriate for students' abilities and foster an independent learning environment. Google Forms and jMetric can be used as alternative software to construct adaptive assessments that accurately detect students' level of difficulty in learning mathematics and are easy to apply. The results of calibrating the content of the instrument with jMetric show that the overall instrument is in the “fairly good” category with a stratum of 2.81. Meanwhile, the development of adaptive assessments based on Google Forms is deemed valid in terms of website appeal and ease of use, with an average of 64.5%. Level kesulitan belajar matematika yang dialami oleh siswa dapat memudahkan guru dalam merancang pembelajaran yang sesuai dengan kemampuan siswa dan menumbuhkan iklim merdeka belajar. Google form dan jMetric dapat dijadikan sebagai software alternatif untuk mengkonstruksi asesmen adaptif pendeteksi level kesulitan belajar matematika siswa yang presisi dan mudah diaplikasikan. Pengembangan asesmen adaptif berbasis google form yang telah dilakukan, diketahui hasil dari validator Pada tahap uji coba soal, diperoleh keterbacaan asesmen sebesar 80%, beberapa item direvisi agar sesuai dengan perkembangan bahasa peserta didik, dan pada tahap uji coba model asesmen serta respon pengguna dinyatakan valid secara aspek ketertarikan website dan kemudahan website rata – rata 64,5 %
Initial Assessment of Tidal Current Energy Resource at Aroih Raya, at Aceh Waters, Indonesia using Delft3D Numerical Modelling
Full text linkAbstract
Tidal energy is one of the renewable energy sources that could be utilised to reduce Indonesia's carbon emissions produced in the energy sector. Many straits have been studied for tidal current energy; however, several straits in Western Indonesia Waters have yet to be studied. In this study, a depth-averaged tidal flow numerical modelling is conducted, with the aim of assessing the tidal current energy resources at Aroih Raya, at Aceh Waters, Northwestern tip of Sumatra Island. The modelling employed the Delft3D-FLOW suite, prescribed with GEBCO bathymetry and TPXO boundary conditions. The model achieved a good validation against a tidal elevation measurement and produced a qualitative similarity to the flow pattern recorded in a navigational book. The modelling output revealed the most energetic flow is situated at the bottleneck of the strait going westward and eastward, with flow speed reaching 2 m/s during spring tide conditions. With five cells identified as potential sites, the Sabelle D10 turbine was found to be suitable for the water depth and current velocity characteristics. Preliminary projection revealed that with 25 turbines at each cell, the projected technical resource is 4,993 MWh for a three-month period. Overall, this tidal current can accommodate 2.58% of Aceh Besar's electricity needs by 2044.
Keywords : Aroih raya, Delft3D, hydrodynamic modelling, marine renewable energy, tidal current.
Abstrak
Energi pasang surut merupakan salah satu sumber energi terbarukan yang dapat digunakan untuk mengurangi emisi karbon dari sektor energi di Indonesia. Banyak selat yang telah diteliti untuk energi arus pasang surut, namun beberapa selat di Perairan Indonesia bagian Barat belum pernah diteliti. Dalam penelitian ini dilakukan pemodelan numerik rata-rata kedalaman arus pasang surut yang bertujuan untuk menilai sumber daya energi arus pasang surut di Aroih Raya, Perairan Aceh, Pulau Sumatera. Pemodelan ini menggunakan perangkat lunak Delft3D-FLOW, yang ditentukan dengan batimetri GEBCO dan kondisi batas TPXO. Model mencapai validasi yang baik terhadap pengukuran elevasi pasang surut dan menghasilkan kemiripan kualitatif dengan deskripsi arus dalam buku navigasi. Hasil pemodelan menunjukkan bahwa aliran yang paling energik terletak di bagian bottleneck selat yang mengarah ke barat dan timur, dengan kecepatan aliran mencapai 2 m/detik pada kondisi pasang surut. Terdapat lima sel yang diidentifikasi sebagai lokasi potensial, turbin Sabelle D10 dipilih karena sesuai dengan kedalaman air dan karakteristik kecepatan arus. Proyeksi awal menunjukkan bahwa dengan 25 turbin di setiap sel, sumber daya teknis yang diproyeksikan adalah 4.993 MWh untuk periode tiga bulan. Secara keseluruhan, arus pasang surut ini mampu mengakomodasi 2,58% kebutuhan listrik di Aceh Besar pada tahun 2044.
Kata Kunci : Aroih raya, arus pasang surut, Delft3D, energi terbarukan laut, pemodelan hidrodinamika.Abstrak
Energi pasang surut merupakan salah satu sumber energi terbarukan yang dapat digunakan untuk mengurangi emisi karbon dari sektor energi di Indonesia. Banyak selat yang telah diteliti untuk energi arus pasang surut, namun beberapa selat di Perairan Indonesia bagian Barat belum pernah diteliti. Dalam penelitian ini dilakukan pemodelan numerik rata-rata kedalaman arus pasang surut yang bertujuan untuk menilai sumber daya energi arus pasang surut di Aroih Raya, Perairan Aceh, Pulau Sumatera. Pemodelan ini menggunakan perangkat lunak Delft3D-FLOW, yang ditentukan dengan batimetri GEBCO dan kondisi batas TPXO. Model mencapai validasi yang baik terhadap pengukuran elevasi pasang surut dan menghasilkan kemiripan kualitatif dengan deskripsi arus dalam buku navigasi. Hasil pemodelan menunjukkan bahwa aliran yang paling energik terletak di bagian bottleneck selat yang mengarah ke barat dan timur, dengan kecepatan aliran mencapai 2 m/detik pada kondisi pasang surut. Terdapat lima sel yang diidentifikasi sebagai lokasi potensial, turbin Sabelle D10 dipilih karena sesuai dengan kedalaman air dan karakteristik kecepatan arus. Proyeksi awal menunjukkan bahwa dengan 25 turbin di setiap sel, sumber daya teknis yang diproyeksikan adalah 4.993 MWh untuk periode tiga bulan. Secara keseluruhan, arus pasang surut ini mampu mengakomodasi 2,58% kebutuhan listrik di Aceh Besar pada tahun 2044.
Kata Kunci : Aroih raya, arus pasang surut, Delft3D, energi terbarukan laut, pemodelan hidrodinamika.
Abstract
Tidal energy is one of the renewable energy sources that could be utilised to reduce Indonesia's carbon emissions produced in the energy sector. Many straits have been studied for tidal current energy; however, several straits in Western Indonesia Waters have yet to be studied. In this study, a depth-averaged tidal flow numerical modelling is conducted, with the aim of assessing the tidal current energy resources at Aroih Raya, at Aceh Waters, Northwestern tip of Sumatra Island. The modelling employed the Delft3D-FLOW suite, prescribed with GEBCO bathymetry and TPXO boundary conditions. The model achieved a good validation against a tidal elevation measurement and produced a qualitative similarity to the flow pattern recorded in a navigational book. The modelling output revealed the most energetic flow is situated at the bottleneck of the strait going westward and eastward, with flow speed reaching 2 m/s during spring tide conditions. With five cells identified as potential sites, the Sabelle D10 turbine was found to be suitable for the water depth and current velocity characteristics. Preliminary projection revealed that with 25 turbines at each cell, the projected technical resource is 4,993 MWh for a three-month period. Overall, this tidal current can accommodate 2.58% of Aceh Besar's electricity needs by 2044.
Keywords : Aroih raya, Delft3D, hydrodynamic modelling, marine renewable energy, tidal current
Analysis of Quercetin from Allium cepa L. Skin Waste in Inhibiting α-Amylase: An Alternate Therapeutic Drug to Treat Diabetes
Full text linkType 2 diabetes is a chronic metabolic disease characterized by an increase in blood sugar due to insulin resistance as well as the decline of insulin production by the pancreas. Quercetin is a flavonoid secondary metabolite that could be utilized as an α-amylase inhibitor and can potentially be used as a therapeutic drug in type 2 diabetes treatment by inhibiting starch hydrolysis in the human body. This research aims to determine the quercetin yield of Allium cepa L. skin waste, evaluate the α-amylase inhibitory properties of the extracted quercetin, and delve into the molecular mechanism of α-amylase inhibition by quercetin. Methods that were used in this research consisted of sample collection and preparation, quercetin extraction, testing for quercetin content in extract by spectrophotometry and HPLC, as well as testing for α-amylase inhibition by quercetin. Quercetin extraction produced 1.52 g of dry extract, yielding 16.8 mg of extract per g of dry shallot skin. Spectrophotometric analysis yielded 3.37 mg of quercetin per gram of dried shallot skin, while HPLC yielded 3.99 mg/g. The shallot skin extract inhibited α-amylase with an IC50 of 348.2 µg/mL. In comparison, acarbose had a more potent inhibitory effect, with an IC50 of 237.4 µg/mL. Quercetin inhibits α-amylase by forming hydrogen bonds with the active sites of the enzyme (Asp197, Glu233, and Asp300)
Taiji’s Design Philosophy by Imagining New Practice Through Three Kingdoms Character Graphic Design
Full text linkThe present study examined the design philosophy of Taiji with the objective of developing a novel graphic design approach and substantiating its viability through a practical graphic design implementation. Application of the Taiji design philosophy was examined by using the characters from the Three Kingdoms in a graphic design practice as a case study. The objective was to assess the practicality and effectiveness of this design approach. The outcome of the research and subsequent discussion indicates that the Taiji design philosophy represents a novel framework for interdisciplinary investigation, encompassing a design methodology centered around the principles of yin and yang contrast as well as harmony and unity. The present findings hold significance in at least two distinct manners. One of the primary objectives was to illustrate how Taiji, when viewed as a philosophical concept, offers a systematic approach for the development of graphic creativity. Additionally, the yin-yang contrast and virtual-real relationship inherent in the Taiji design philosophy facilitate the transformation of two-dimensional space into a three-dimensional visual design concept for graphic designers. Undoubtedly, numerous issues regarding the underlying principles of Taiji’s design philosophy remain unresolved
Dampak Beban Sumbu Kendaraan Berlebih (Over Dimension Over Loading) Terhadap Penurunan Umur Layan Perkerasan Jalan Dan Peningkatan Kebutuhan Biaya Pemeliharaan Jalan Tol
Full text linkAbstrak
Kebijakan Zero ODOL telah dideklarasikan tahun 2023 namun faktanya masih banyak pelanggaran ODOL khususnya di ruas jalan tol. Dampak dari pelanggaran ODOL ini adalah penurunan umur layan perkerasan jalan dan meningkatnya biaya pemeliharaan jalan yang harus di alokasikan oleh Pengelola Jalan Tol. Kajian ini dilakukan untuk mengukur seberapa besar dampak yang terjadi. Analisis data dilakukan dengan membandingkan umur layan perkerasan dan biaya pemeliharaan jalan yang dihasilkan beban faktual dari data Weight in Motion (WIM) dan beban normal kendaraan berdasarkan beban ijin yang ditetapkan oleh Kementerian Perhubungan. Hasil analisis menunjukkan penurunan umur layan yang lebih cepat daripada umur layan yang direncanakan akibat kendaraan ODOL pada ruas jalan tol Jakarta – Bogor – Ciawi, tol JORR E dan tol Padalarang – Cileunyi. Dampak dari penurunan umur layan yang lebih cepat ini adalah kenaikan biaya pemeliharaan jalan sebesar 17.38% untuk ruas tol Jakarta – Bogor – Ciawi, tol JORR E naik 13.59% dan tol Padalarang – Cileunyi naik 10.89% dari biaya normal pemeliharaan jalan.
Kata-kata kunci: ODOL, umur layan perkerasan jalan, biaya pemeliharaan jalan tol
Abstract
The Zero ODOL policy has been declared in 2023, but in fact there are still many ODOL violations, particularly on toll road sections. The impact of these ODOL violations is the reduction in the service life of the road pavement and the increase in maintenance costs that must be allocated by the Toll Road Operators. This study is conducted to measure the extent of the impact. Data analysis was perfomed by comparing the service life of the pavement and road maintance costs generated by actual load data from Weight in Motion (WIM) and the normal vehicle load based on the weight limits set by the Ministy of Transportation. The analysis results show a faset reduction in the service life compared to the planned service life due to ODOL vehicles on the toll roads of Jakarta – Bogor – Ciawi, JORR E, and Padalarang – Cileunyi. The impact of this faster reduction in service life is an increase in Toll Road maintenance costs by 17.38% for the Jakarta – Bogor – Ciawi, 13.59% for the JORR E, and 10.89% for the Padalarang – Cileunyi, compared to the normal Toll Road maintenance costs.
Keywords: ODOL, remaining service life of pavement, toll road maintenance costsAbstrak
Kebijakan Zero ODOL telah dideklarasikan tahun 2023 namun faktanya masih banyak pelanggaran ODOL khususnya di ruas jalan tol. Dampak dari pelanggaran ODOL ini adalah penurunan umur layan perkerasan jalan dan meningkatnya biaya pemeliharaan jalan yang harus di alokasikan oleh Pengelola Jalan Tol. Kajian ini dilakukan untuk mengukur seberapa besar dampak yang terjadi. Analisis data dilakukan dengan membandingkan umur layan perkerasan dan biaya pemeliharaan jalan yang dihasilkan beban faktual dari data Weight in Motion (WIM) dan beban normal kendaraan berdasarkan beban ijin yang ditetapkan oleh Kementerian Perhubungan. Hasil analisis menunjukkan penurunan umur layan yang lebih cepat daripada umur layan yang direncanakan akibat kendaraan ODOL pada ruas jalan tol Jakarta – Bogor – Ciawi, tol JORR E dan tol Padalarang – Cileunyi. Dampak dari penurunan umur layan yang lebih cepat ini adalah kenaikan biaya pemeliharaan jalan sebesar 17.38% untuk ruas tol Jakarta – Bogor – Ciawi, tol JORR E naik 13.59% dan tol Padalarang – Cileunyi naik 10.89% dari biaya normal pemeliharaan jalan.
Kata-kata kunci: ODOL, umur layan perkerasan jalan, biaya pemeliharaan jalan tol
Abstract
The Zero ODOL policy has been declared in 2023, but in fact there are still many ODOL violations, particularly on toll road sections. The impact of these ODOL violations is the reduction in the service life of the road pavement and the increase in maintenance costs that must be allocated by the Toll Road Operators. This study is conducted to measure the extent of the impact. Data analysis was perfomed by comparing the service life of the pavement and road maintance costs generated by actual load data from Weight in Motion (WIM) and the normal vehicle load based on the weight limits set by the Ministy of Transportation. The analysis results show a faset reduction in the service life compared to the planned service life due to ODOL vehicles on the toll roads of Jakarta – Bogor – Ciawi, JORR E, and Padalarang – Cileunyi. The impact of this faster reduction in service life is an increase in Toll Road maintenance costs by 17.38% for the Jakarta – Bogor – Ciawi, 13.59% for the JORR E, and 10.89% for the Padalarang – Cileunyi, compared to the normal Toll Road maintenance costs.
Keywords: ODOL, remaining service life of pavement, toll road maintenance cost
Rancang Bangun Intensitymeter Berbasis MEMS Dengan Algoritma Pendeteksi Kejadian STA/LTA dan Sistem Peringatan Multi-Saluran
Full text linkIndonesia is an earthquake-prone country due to its location at the convergence of three major tectonic plates. To support disaster mitigation, a reliable and affordable monitoring system is required. This study presents a low-cost intensitymeter using a MEMS WT61C sensor with the STA/LTA detection algorithm, Raspberry Pi 4 for processing, and a Ublox Neo-M8N GNSS module for time and location synchronization. The system supports online and offline modes with a store-and-forward mechanism and delivers alerts via buzzer, SMS, and Telegram. The WT61C was configured with 20 Hz bandwidth and 100 Hz sampling rate. Tests showed the device detected local earthquakes, calculated Peak Ground Acceleration (PGA), and estimated Modified Mercalli Intensity (MMI). In simulations of the Lombok 2018 earthquake (M7.0), it produced PGA values of 0.5704 g (23.3% error) and 0.7495 g (0.8% error) against the reference 0.744 g, both consistent with MMI VIII. SMS was sent serially with 5–7 s latency, while Telegram worked in real time. Validation was limited to a simulator with one dataset, without diverse soil or magnitude scenarios. In conclusion, the system provides an effective, low-cost solution for earthquake intensity monitoring and has potential for early warning applications.Indonesia merupakan negara rawan gempa karena berada di pertemuan tiga lempeng tektonik utama. Untuk mendukung mitigasi bencana, diperlukan sistem pemantauan gempa yang andal dan terjangkau. Penelitian ini bertujuan merancang intensitymeter berbasis MEMS WT61C dengan algoritma deteksi STA/LTA, menggunakan Raspberry Pi 4 sebagai pemroses dan GNSS Ublox Neo-M8N untuk sinkronisasi waktu serta lokasi. Sistem mendukung operasi online maupun offline dengan mekanisme store-and-forward, serta diseminasi multi-saluran melalui alarm buzzer, SMS, dan Telegram. Sensor WT61C dikonfigurasi dengan bandwidth 20 Hz dan sampling rate 100 Hz. Hasil pengujian menunjukkan perangkat mampu mendeteksi gempa lokal, menghitung Peak Ground Acceleration (PGA), dan mengestimasi intensitas MMI. Pada uji simulator gempa Lombok 2018 (M7,0), sistem menghasilkan nilai PGA 0,5704 g (error 23,3%) dan 0,7495 g (error 0,8%) dibanding data referensi 0,744 g, dengan estimasi konsisten pada MMI VIII. SMS terkirim serial dengan latensi 5–7 detik, sedangkan Telegram terkirim paralel secara real-time. Keterbatasan penelitian ini adalah validasi masih terbatas pada simulator gempa BMKG dengan satu data gempa, tanpa uji pada berbagai kondisi tanah maupun variasi magnitudo. Kesimpulannya, sistem intensitymeter ini dapat menjadi solusi pemantauan intensitas gempa dan berpotensi dikembangkan lebih lanjut untuk mendukung sistem peringatan dini
Leisure Time Habits and Physical Activity Levels in Junior High School Students in the Kepulauan Seribu, Jakarta
Full text linkPhysical activity during adolescence plays a vital role in supporting optimal
physical and mental development. This study aimed to assess physical activity levels
and sedentary behavior among junior high school students in Thousand Islands
regency of Jakarta, Indonesia. The research involved 215 students from grades VII
and VIII, consisting of 104 males and 109 females. Physical activity levels were
assessed using a modified version of the International Physical Activity
Questionnaire (IPAQ) tailored for adolescents. The results indicated that the
majority of students on both islands demonstrated moderate to high levels of
physical activity, with a relatively low prevalence of sedentary behavior. These
findings suggest that the students’ engagement in active routines is influenced by
the geographic and socio-cultural characteristics of their island environment,
which promote outdoor and communal activities. However, a small portion of
students reported low activity levels, emphasizing the need for context-sensitive
interventions to sustain and enhance active behaviors. This study highlights the
importance of integrating localized health promotion strategies to prevent the long-
term risks of obesity, metabolic disorders, and mental health challenges. The results
serve as a valuable reference for health policymakers and educators in designing
effective physical activity programs for youth in remote and coastal communities.
Keywords: children, jakarta, leisure, physical activity, sedentar