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INDONESIA
Jurnal Teknik Indonesia
Published by Publica Scientific Solution
ISSN : 29648092     EISSN : 29632293     DOI : https://doi.org/10.58860/jti
Core Subject : Engineering,
Electrical & Electronics Engineering Engineering Transportation
Indonesian Technical Journal is a scientific journal in the form of research and can be accessed openly. This journal is published quarterly by Publica Scientific Solution. Indonesian Technical Journal provides a means for ongoing discussion of relevant issues that fall within the focus and scope of the journal that can be examined empirically. This journal publishes research articles that cover all aspects of Engineering science.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 129 Documents
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Stabilitas Bendungan Tiga Dihaji (Tipe Zona) Berdasarkan Nilai Sudut Geser dan Kohesi (c) Hasil Uji Geser Langsung Skala Penuh (1:1) di Lapangan Heru Utomo; Agus Sulaeman; Chandra Afriade Siregar
Jurnal Teknik Indonesia Vol. 5 No. 3 (2026): Jurnal Teknik Indonesia
Publisher : Publica Scientific Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58860/jti.v5i4.920

Abstract

Bendungan Tiga Dihaji merupakan tipe urugan zona yang terdiri dari bendungan utama dan koferdam yang menjadi satu kesatuan bendungan, tersusun atas inti lempung vertikal, filter, transisi, dan urugan batu. Parameter stabilitas bendungan yang dibutuhkan adalah kuat geser yang dinyatakan dengan sudut geser dalam dan kohesi (c) yang diperoleh dari uji triaxial atau uji geser langsung. Material acak dengan penyusun yang bervariasi menyebabkan hasil uji geser langsung skala kecil di laboratorium tidak mencerminkan kuat geser sebenarnya, karena butir berukuran besar tidak dapat disertakan dalam pengujian. Penelitian ini dilakukan untuk mengatasi keterbatasan tersebut dengan menggunakan uji geser langsung skala penuh (1:1) di lapangan yang mampu mengakomodasi partikel berukuran besar. Dari hasil pengujian geser langsung ukuran skala besar didapatkan nilai sudut geser sebesar 41,8° dan nilai kohesi (c) nol. Nilai Faktor Keamanan Tanpa Gempa (Analisis Statis) dari berbagai kondisi memenuhi kriteria yang dipersyaratkan (FK > 1,5), sehingga tidak perlu perubahan geometri. Dilanjutkan dengan analisis stabilitas dinamik dengan metode koefisien gempa termodifikasi/OBE 145 tahun. Nilai Faktor Keamanan (Analisis Stabilitas Dinamik dengan metode koefisien gempa termodifikasi) OBE 145 tahun (FK > 1,2) sehingga tidak perlu perubahan geometri. Dilanjutkan dengan analisis stabilitas dinamik dengan metode koefisien gempa termodifikasi/MDE 10.000 tahun. Nilai Faktor Keamanan MDE 10.000 tahun hanya pada kondisi after construction yang memenuhi persyaratan, sedangkan pada kondisi Muka Air Normal (Normal Water Level), Surut Cepat (Rapid Draw Down), dan Muka Air Banjir (High Water Level) nilai Faktor Keamanan tidak memenuhi persyaratan (FK < 1), sehingga dilanjutkan dengan analisis alihan tetap dengan cara Makdisi-Seed (Alihan < 0,5 tinggi jagaan).
Overcoming DES Key-Length Limitations: A Novel Approach to Position Conversion and 128-Bit Key Encryption Mochammad Imam Sulistyo Sarjowo; Sugi Guritman; Eng Heru Sukoco; Irman Hermadi
Jurnal Teknik Indonesia Vol. 5 No. 3 (2026): Jurnal Teknik Indonesia
Publisher : Publica Scientific Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58860/jti.v5i3.925

Abstract

The Data Encryption Standard (DES) is an algorithm designed to protect information by converting it from a readable form, known as plaintext, into an unreadable form, known as ciphertext. This process is called encryption, whereas the reverse process, which translates ciphertext back into plaintext, is referred to as decryption. The primary weakness of DES lies in its relatively short key length, which allows all possible keys to be exhaustively tested in a relatively short time. This research aims to address that weakness by designing a derivative of the DES algorithm with a key length exceeding 64 bits. The findings of this study indicate that the position conversion table within DES plays the most critical role in determining the key length that the algorithm can process. Consequently, this research focuses on developing a pattern for position conversion labeling, with the expectation that it can be utilized to construct a new position conversion table capable of handling keys longer than 64 bits. The final result of this study is the development of a new DES-derived algorithm with a 128-bit key, named DES-Aku. However, DES-Aku is not merely a derivative of DES; it also serves as a protocol for constructing position conversion labels within DES. As an algorithm, DES-Aku successfully performs character encryption using a 128-bit key, and as a protocol, DES-Aku successfully demonstrates a pattern for constructing position conversion tables in DES, which can further be utilized to develop new position conversion tables for keys exceeding 128 bits.
Keputusan Investasi Proyek Refurbish dan Uprating Unit 6 Plta Ir. H. Djuanda dengan Penganggaran Modal Inkremental Emilia Rahmadani; Christiono Utomo
Jurnal Teknik Indonesia Vol. 5 No. 3 (2026): Jurnal Teknik Indonesia
Publisher : Publica Scientific Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58860/jti.v5i4.927

Abstract

Penelitian ini bertujuan untuk menganalisis kinerja finansial alternatif refurbish dan uprating serta menentukan alternatif investasi berdasarkan pendekatan penganggaran modal inkremental. Metode analisis yang digunakan adalah capital budgeting dengan indikator Net Present Value (NPV), Internal Rate of Return (IRR), dan Discounted Payback Period (DPP). Selanjutnya, karena kedua alternatif bersifat mutually exclusive, dilakukan analisis Incremental IRR untuk mengevaluasi tambahan investasi pada alternatif uprating dibandingkan alternatif refurbish. Analisis sensitivitas juga dilakukan dengan pendekatan deterministik terhadap perubahan CAPEX, OPEX, dan revenue untuk mengetahui pengaruh perubahan parameter terhadap nilai NPV serta menentukan batas perubahan parameter yang menyebabkan NPV menjadi negatif.Hasil penelitian menunjukkan bahwa kedua alternatif investasi menghasilkan kinerja finansial yang memenuhi kriteria evaluasi pada kondisi dasar. Hasil analisis sensitivitas menunjukkan bahwa revenue merupakan parameter yang paling sensitif terhadap perubahan nilai NPV pada kedua alternatif. Berdasarkan nilai switching value, alternatif refurbish memiliki batas toleransi yang lebih besar terhadap kenaikan CAPEX dan penurunan revenue, yaitu CAPEX meningkat hingga 76% dan revenue menurun hingga 17% sebelum NPV menjadi negatif. Sementara itu, alternatif uprating menghasilkan NPV negatif ketika CAPEX meningkat hingga 27% dan revenue menurun hingga 14%. Pada parameter OPEX, alternatif uprating memiliki batas toleransi sebesar 38%, sedangkan alternatif refurbish sebesar 33%. Hasil analisis inkremental menunjukkan nilai Incremental IRR sebesar 6,82%, lebih tinggi dibandingkan MARR sebesar 6,49%. Dengan demikian, tambahan investasi pada alternatif uprating masih menghasilkan tingkat pengembalian tambahan di atas tingkat pengembalian minimum yang disyaratkan, meskipun dengan margin yang relatif terbatas.
Analisis dan Optimasi Design PLTS di Hydrogen Plant: Studi Kasus PLTU Banten 1 Suralaya Aditia Setiaputra; Marwan Rosyadi
Jurnal Teknik Indonesia Vol. 5 No. 3 (2026): Jurnal Teknik Indonesia
Publisher : Publica Scientific Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58860/jti.v5i3.928

Abstract

Pemerintah Indonesia menargetkan pencapaian Net Zero Emission (NZE) pada tahun 2060, yang mendorong PT PLN (Persero) berkomitmen mengembangkan sistem ketenagalistrikan berbasis Energi Baru Terbarukan (EBT) serta membangun ekosistem hidrogen hijau di Indonesia. Penelitian ini bertujuan untuk menganalisis dan mengoptimasi desain penambahan PLTS di PLTU Banten 1 Suralaya serta mengevaluasi kelayakan ekonomi-teknisnya guna memenuhi kebutuhan energi listrik untuk produksi hidrogen hijau. Metode yang digunakan meliputi simulasi Monte Carlo untuk memproyeksikan defisit energi, pemodelan desain PLTS dengan PVSyst 8.0.6, pemilihan lokasi optimal menggunakan Analytical Hierarchy Process (AHP) berdasarkan 4 kriteria dan 4 alternatif lokasi, serta analisis ekonomi-teknik mencakup Biaya Investasi Awal, Net Present Value (NPV), Internal Rate of Return (IRR), dan Payback Period. Hasil penelitian menunjukkan bahwa PLTS eksisting menghasilkan 37,145 MWh per tahun, sedangkan kebutuhan energi electrolyzer mencapai 178,681 MWh per tahun, dengan defisit harian 383–387 kWh berdasarkan simulasi Monte Carlo. Lokasi Workshop Pemeliharaan terpilih sebagai lokasi optimal dengan bobot 45,0% dan CR 5,0%. Simulasi PVSyst menunjukkan penambahan PLTS di lokasi tersebut menghasilkan 120,04 MWh per tahun, sehingga kebutuhan electrolyzer dapat terpenuhi penuh dari energi terbarukan pada jam 09.00–15.00, namun terjadi surplus energi yang tidak termanfaatkan tanpa BESS. Analisis ekonomi menunjukkan kelayakan proyek dengan Biaya Investasi Awal USD 38.704, NPV USD 4.077, IRR 11,54%, dan Payback Period 7 tahun. Penelitian ini merekomendasikan penambahan BESS untuk mengoptimalkan pemanfaatan energi surya sepanjang hari, serta memberikan saran teknis, kebijakan, dan penelitian lanjutan bagi berbagai pemangku kepentingan dalam mendukung pengembangan green hydrogen di Indonesia.
Relayout Fasilitas Menggunakan Mixed Integer Linear Programming untuk Memenuhi Standar GMP PT. ABC Ewaldo Jales Edinov; Saufik Luthfianto; Tofik Hidayat
Jurnal Teknik Indonesia Vol. 5 No. 3 (2026): Jurnal Teknik Indonesia
Publisher : Publica Scientific Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58860/jti.v5i4.930

Abstract

Perancangan tata letak fasilitas (facility layout) merupakan salah satu aspek penting dalam manajemen operasi yang berpengaruh terhadap kelancaran aliran material dan efisiensi sistem produksi. Tata letak fasilitas yang kurang optimal pada PT. ABC menyebabkan inefisiensi perpindahan material dan resiko kontaminasi silang yang melanggar standar good manufacturing practices. Penelitian ini bertujuan merancang ulang tata letak fasilitas produksi menggunakan metode mixed integer linear programming untuk meminimalkan total momen perpindahan sekaligus memenuhi standar keamanan pangan. Kondisi eksisting menunjukkan adanya backtracking sepanjang 19 meter pada total lintasan 87 meter yang memicu peningkatan momen perpindahan material dan tingginya potensi paparan bakteri. Ketidakpastian permintaan pasar diakomodasi melalui perhitungan expected flow yang menghasilkan 754,5 ritasi/bulan. Hasil penelitian berhasil memangkas jarak fisik lintasan sepanjang 34,85 meter, merepresentasikan peningkatan efisiensi sebesar 59,94% dengan total momen perpindahan yang direduksi dari 65.641,5 menjadi 43.346,03 menghasilkan efisiensi beban operasional sebesar 33,97% model mixed integer linear programming terbukti menyelesaikan permasalahan teknis tata ruang industry sekaligus menjamin kepatuhan regulasi kebersihan pabrik pangan.
Analysis of Construction Management of Retaining Wall Structures in The CWC-1BKC Babakan and Cisanggarung River Works Project: A Case Study of The CS-5 Kalibuntu Segment, Cirebon Regency Lintang Septiani; Heri Mulyono; Ohan Farhan
Jurnal Teknik Indonesia Vol. 5 No. 3 (2026): Jurnal Teknik Indonesia
Publisher : Publica Scientific Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58860/jti.v5i3.934

Abstract

Flood-control infrastructure requires effective construction management to ensure that limited resources are converted into reliable structures within the planned cost and duration. This study aimed to analyze the work quantities, budget, implementation schedule, critical activities, and planned progress of the retaining-wall structure in the CS-5 Kalibuntu segment of the CWC-1BKC Babakan and Cisanggarung River Works Project. A quantitative case-study approach was applied using contract documents, working drawings, and secondary project data. AutoCAD was used for quantity take-off, Microsoft Excel for Work Unit Price Analysis and budget estimation, and Microsoft Project for Work Breakdown Structure development, Critical Path Method analysis, and S-curve preparation. The analysis covered 60 repetitive segments along 720 meters. The estimated construction cost was IDR 54,535,705,559.17, with fill-material transportation contributing approximately 47%, reinforcement work 21%, K-225 concrete 14%, bored-pile reinforcement and casting 10%, and other activities 8%. The planned duration was 137 calendar days. Most evaluated activities had zero total float, indicating that delays in bored-pile, reinforcement, and concrete work could directly postpone project completion. The study concludes that integrating quantity, cost, schedule, and progress analyses provides a practical and coherent basis for controlling retaining-wall construction and anticipating cost and schedule deviations in river-infrastructure projects during project implementation.
Productivity Analysis of The Pindad Excava200 Pontoon Excavator in The Masangan River Normalization Project Pasuruan Regency Muh. Tafsir; Esti Wulandari; Andi Patriadi
Jurnal Teknik Indonesia Vol. 5 No. 3 (2026): Jurnal Teknik Indonesia
Publisher : Publica Scientific Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58860/jti.v5i3.938

Abstract

River sedimentation reduces channel capacity and increases flood risk, making river normalization essential for restoring hydraulic performance. The success of such projects depends substantially on the productivity and operational efficiency of heavy equipment operating under waterlogged conditions. This study aimed to determine the productivity of the Pindad Excava200 pontoon excavator in the Masangan River Normalization Project, Pasuruan Regency. A quantitative applied research design was employed. Primary data were collected through direct field observations of bucket capacity, cycle time, work efficiency, operating hours, equipment condition, and fuel and lubricant consumption, while secondary data were obtained from project documents, equipment specifications, relevant literature, and the 2026 Analisis Harga Satuan Pekerjaan (AHSP). Productivity was calculated for sediment dredging and finishing operations using the observed operational parameters. The results showed that the excavator achieved a productivity of 52.35 m³/hour, equivalent to 418.80 m³/day, during dredging and 67.79 m³/hour, equivalent to 542.32 m³/day, during finishing. Fuel consumption was 0.357 L/m³ for dredging and 0.268 L/m³ for finishing, whereas lubricant consumption was 0.010 L/m³ and 0.007 L/m³, respectively. In conclusion, finishing operations were more productive and resource-efficient than dredging operations because of their shorter cycle times and simpler operational sequences. These findings may support more accurate equipment planning and resource allocation in comparable river normalization and hydraulic engineering projects.
Cost Management Analysis of Project Delays Using The Earned Value Method for The Mbambang River Gabion Construction Project Malang Regency Surya Adi Rinekso; Esti Wulandari; Andi Patriadi
Jurnal Teknik Indonesia Vol. 5 No. 3 (2026): Jurnal Teknik Indonesia
Publisher : Publica Scientific Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58860/jti.v5i3.939

Abstract

River protection infrastructure requires effective cost and schedule control because construction delays can increase expenditures and reduce project performance. This study aimed to evaluate the cost and schedule performance of the Mbambang River gabion construction project in Malang Regency using the Earned Value Method (EVM). A quantitative applied research design was employed using primary data obtained from field observations, project implementation records, and construction documentation, along with secondary data consisting of project schedules, budgets, progress reports, and the work breakdown structure. Project performance was assessed using the Budgeted Cost for Work Scheduled (BCWS), Budgeted Cost for Work Performed (BCWP), Actual Cost for Work Performed (ACWP), Cost Variance (CV), Schedule Variance (SV), Cost Performance Index (CPI), and Schedule Performance Index (SPI). The results showed that gabion installation experienced significant schedule delays and cost inefficiency, with an SPI of 0.40, CPI of 0.90, SV of ?Rp1,391,064,088, and CV of ?Rp103,333,416. Nonwoven geotextile installation performed closer to the planned schedule but remained cost-inefficient, recording an SPI of 0.95, CPI of 0.91, SV of ?Rp1,966,686, and CV of ?Rp4,110,373. These findings demonstrated that both activities experienced schedule and cost deviations, although the magnitude of the deviations differed. The study concluded that EVM provides an effective early-warning framework for identifying project performance deviations and supporting timely corrective decisions in river infrastructure construction.
Slope Stability Analysis of The Nipah Dam Embankment in Madura, Indonesia Bakti Yudi Firmanto; Andi Patriadi; Esti Wulandari
Jurnal Teknik Indonesia Vol. 5 No. 3 (2026): Jurnal Teknik Indonesia
Publisher : Publica Scientific Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58860/jti.v5i3.940

Abstract

Dam safety is essential for sustaining water supply, irrigation, flood control, and downstream community protection. Operational changes in reservoir levels may alter hydrostatic pressure, seepage conditions, and embankment stability, requiring comprehensive safety assessments. This study aimed to evaluate the slope stability and seepage safety of the Nipah Dam embankment under normal operation, raised reservoir level, rapid drawdown, and seismic loading conditions. A quantitative approach was applied using hydrological records, dam specifications, reservoir data, geotechnical parameters, and field observations. Reservoir inflow was modeled using HEC-HMS, while seepage behavior and pore-water pressure were analyzed using SEEP/W. Slope stability was evaluated using SLOPE/W based on the Bishop limit equilibrium method under static loading, Operating Basis Earthquake (OBE), and Safety Evaluation Earthquake (SEE) conditions. Under static loading, the factors of safety ranged from 2.302 to 3.209, exceeding the required criteria of 1.5 for steady-state seepage and 1.3 for rapid drawdown conditions. Under OBE loading, the factors of safety ranged from 1.623 to 2.111, while SEE loading produced values ranging from 1.001 to 1.398, satisfying the minimum criteria of 1.2 and 1.0, respectively. The piping safety factor was 5.9, exceeding the recommended value of 4.0. Therefore, Nipah Dam remained stable and safe under both existing operating conditions and the proposed 1.5-m increase in normal water level during normal operation and seismic events.
Cost Efficiency Analysis of Riverbank Protection Work Acceleration Using the Critical Path Method at the Masangan River, Pasuruan Regency Ahzam Zarkasy Septian Danu; Andi Patriadi; Esti Wulandari
Jurnal Teknik Indonesia Vol. 5 No. 3 (2026): Jurnal Teknik Indonesia
Publisher : Publica Scientific Solution

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58860/jti.v5i3.941

Abstract

Riverbank protection projects are susceptible to delays caused by fluctuating river discharge, tidal conditions, adverse weather, and restricted working hours. Such delays can increase project costs and reduce the effectiveness of disaster mitigation measures. This study evaluated the cost efficiency of accelerating the Masangan Riverbank Protection Project in Pasuruan Regency using the Critical Path Method (CPM). A quantitative approach was applied using secondary data, including the work breakdown structure, baseline schedule, activity durations, work volumes, progress reports, S-curve, and project cost documents. CPM calculations were used to identify critical activities based on earliest start and finish times, latest start and finish times, and zero float values. Acceleration was implemented by adding workers to critical activities while maintaining eight working hours per day and six working days per week. Workforce additions reduced the durations of K-175 concrete work, rubble masonry, and weep-hole installation from 42 to 30 days, although direct labor costs increased. The respective cost slopes were IDR 668,824, IDR 1,637,280, and IDR 818,640 per day. K-175 concrete work was identified as the most economical acceleration alternative, whereas rubble masonry represented the highest additional cost. The integration of CPM and cost-slope analysis supported selective schedule acceleration by prioritizing critical activities that achieved the greatest time reduction with the lowest additional cost.

Page 12 of 13 | Total Record : 129

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