Garuda - Garba Rujukan Digital

Examination Of Investment Viability Through ROI and BCR Regarding The Creation Of A WebGIS-Based Road Damage Management Software At The Mojokerto PJJ UPT Andy Martono; Budi Witjaksana; Andi Patriadi
Formosa Journal of Science and Technology Vol. 5 No. 6 (2026): June 2026
Publisher : PT FORMOSA CENDEKIA GLOBAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55927/fjst.v5i6.100

Public participation in reporting road conditions is increasing through digital-based road damage complaint applications. However, handling road damage complaints is still hampered by inaccurate data, inadequate system monitoring of repairs and quality, manual management of costs and repair history, and a lack of data integration. This situation necessitates repair cost analysis for each repair, documentation of damage history and repair methods, and WebGIS-based spatial mapping of repairs to ensure data is documented, tracked, and analyzed more systematically for monitoring and evaluating road maintenance within a single system. This research is important to conduct because it can contribute to the development of a WebGIS-based road maintenance monitoring and evaluation system integrated with road damage complaints. The research not only analyzes the condition of road damage and repairs, but also analyzes the economic feasibility of developing WebGIS using the ROI and BCR methods. The results of the research are expected to help road management agencies in improving the effectiveness and efficiency of road maintenance through the use of WebGIS technology. The feasibility analysis of WebGIS investment using the ROI method yielded a positive ROI of 76.90%, making it financially viable. The calculated BCR value of 1.68 indicates that the benefits of WebGIS development are financially viable (BCR > 1)

Analysis of Operational Performance and Investment Costs of AKDP Bus Services (Madiun-Ponorogo Route) Using Net Present Value (NPV), Internal Rate of Return (IRR), Payback Period (PP), and Break Event Point (BEP) Methods Irma Kamaliah; Budi Witjaksana; Hanie Teki Tjendani
Formosa Journal of Science and Technology Vol. 5 No. 6 (2026): June 2026
Publisher : PT FORMOSA CENDEKIA GLOBAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55927/fjst.v5i6.92

The decrease in public enthusiasm for public transport, driven by a rise in private vehicle usage and other transport options, has led to a review of the effectiveness and quality of public transit services. This study aimed to evaluate the operational efficiency and significance of the Madiun-Ponorogo intercity bus (AKDP) line, as well as to assess the potential for making investments to enhance service quality. The research employed a descriptive quantitative approach. The examination utilized operational performance metrics, while the assessment of investment was carried out using methods such as Net Present Value (NPV), Internal Rate of Return (IRR), Payback Period (PP), and Break Even Point (BEP). Findings indicated that the operational performance of the Madiun-Ponorogo intercity bus route remains inadequate, illustrated by lengthy intervals between buses that lead to extended waiting periods. The investment assessment was deemed financially viable, denoted by a positive NPV, an IRR that exceeds the 6% interest, a Payback Period occurring by the fifth year with a net gain of Rp 578,131,790, and a BEP that surpasses the established minimum in both unit and monetary values

Housing Development Performance Evaluation Through the Earned Value Technique (Case Study: Safira Gold Mansion, Appenzel Model, Two-Story Home) Axel Prasetya Adoe; Budi Witjaksana; Dika Ayu Safitri
Formosa Journal of Science and Technology Vol. 5 No. 6 (2026): June 2026
Publisher : PT FORMOSA CENDEKIA GLOBAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55927/fjst.v5i6.91

Project performance control requires an approach that quantitatively integrates planning and implementation. Earned Value Management is used as a method to evaluate cost and time performance through the Cost Performance Index (CPI) and Schedule Performance Index (SPI) indicators. Therefore, it is necessary to implement EVM that not only focuses on evaluating performance indicators numerically, but is also able to represent the actual conditions of the project based on implementation data, so that the analysis of project performance deviations can be carried out more comprehensively and contextually according to the characteristics of the housing project being studied. The results of the project cost performance analysis using the Cost Performance Index (CPI) indicator, the project experienced inefficiency in implementation costs. In the 43rd week, the CPI value was obtained at 0.64, indicating that the actual costs used were greater than the value of the work successfully achieved. The results of the Cost Variance (CV) calculation showed a negative value of Rp149,531,847,789, indicating that the project cost overrun occurred. In addition, the results of the Estimate at Complete (EAC) calculation showed that the estimated final project cost had increased compared to the initial project plan cost. This condition was influenced by increased operational costs due to delays in project duration, increased work implementation costs, and suboptimal use of project resources during the project implementation process.

In a Commercial Restaurant Construction Project in Eastern Indonesia, Alternative Materials Based on Value Engineering for Architectural Work Putri Dwi Rahayu; Budi Witjaksana; Dika Ayu Safitri
Formosa Journal of Science and Technology Vol. 5 No. 6 (2026): June 2026
Publisher : PT FORMOSA CENDEKIA GLOBAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55927/fjst.v5i6.84

Commercial construction projects in Eastern Indonesia have to deal with high costs for getting materials, difficult transportation issues, and a Construction Cost Index that is much higher than the average for the whole country. This study looks into the following question: What different building designs and materials can be suggested using Value Engineering (VE) for the Mie Gacoan Sorong–Nangka restaurant construction project, while still making sure the building works as well as it was planned to. A descriptive quantitative method was used, based on the SAVE International six-phase Job Plan. During the function analysis stage, the Cost-to-Worth Ratio (C/W) was used to find granite tile products that had extra costs, which means their C/W was higher than 1.00.. The suggested options were Asia Tile Brown Oak, Granite Tile Grey Matte Lokal, Arna Wood Plank Brown Walnut, Essenza Absolute Black, and Asia Tile Outdoor Wood Brown. All other options worked just as well as the floor coverings and looked good together with the restaurant's modern industrial style. A Life Cycle Cost (LCC) analysis over 10 years, using a 6% discount rate, showed that the alternatives were more economical. The analysis found cost savings of between 25.55% and 26.81% for each pair of materials. The total cost saved from implementing VE reached IDR 12,665,548.50, which is 21.81% of the existing granite tile budget that was reviewed. These results show that VE is a useful and real-world method for choosing the best building materials in commercial restaurant projects in Eastern Indonesia, where there are specific transportation and supply challenges

Traffic Volume-Based Road Infrastructure Performance Analysis in Jl. A. Yani Gedangan, Sidoarjo Regency Nursaid; Budi Witjaksana; Hanie Teki Tjendani
Formosa Journal of Science and Technology Vol. 5 No. 6 (2026): June 2026
Publisher : PT FORMOSA CENDEKIA GLOBAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55927/fjst.v5i6.83

This research intends to evaluate the features of traffic flow and the effectiveness of road infrastructure along Jl. A Yani Gedangan in Sidoarjo Regency. The study was carried out on a 1. 2-kilometer stretch from KM 2+100 to KM 3+300 over a week (from March 10 to March 16, 2026). Methods for field surveys involved measuring traffic volume, speed, travel duration, and road layout. The analysis of road performance is based on the 2023 Indonesian Road Capacity Guidelines (PKJI). Findings indicate that the Average Daily Traffic (ADT) stands at 17,867 passenger car units per day, with motorcycles constituting 65 percent of that total. The highest traffic volumes are recorded from 07:00 to 08:00, reaching 2,150 pcu per hour, and from 16:00 to 17:00 with 2,080 pcu per hour. The road's capacity is determined to be 2,344 pcu per hour, and the degree of saturation is calculated at 0. 917 during the morning peak and 0. 887 in the afternoon peak, categorizing it as saturated. In the morning peak hours, the average speed decreases to 18 kilometers per hour, resulting in a Level of Service rating of F, indicating severe congestion. In summary, the traffic flow characteristics on Jl. A Yani Gedangan are primarily dominated by motorcycles, featuring distinct morning and evening peak periods. However, the performance of road infrastructure falls short of acceptable standards due to high saturation levels, lower-than-acceptable speeds, and inadequate levels of service. Recommendations include measures to lower traffic volumes during peak times, implement controls on illegal parking, and enhance road infrastructure

Examination of Service Excellence Criteria and Viability of Investing in Damri Specialized Transportation for the Purabaya Terminal Path to Juanda Airport through the Fuzzy Servqual Method and Importance Performance Analysis (IPA) Luh Putu Rewinda Wiriandeni; Hanie Teki Tjendani; Budi Witjaksana
Formosa Journal of Science and Technology Vol. 5 No. 6 (2026): June 2026
Publisher : PT FORMOSA CENDEKIA GLOBAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55927/fjst.v5i6.82

The Damri transport service operating between Terminal Purabaya and Juanda Airport is currently facing a situation of low usage of its fleet capacity. This scenario is reflected in the load factor, which stays under the ideal benchmark of 70% for public transportation, according to the Decree issued by the Director General of Land Transportation Number 687 of 2002. Such a situation highlights the necessity for enhancements in service quality and accompanying facilities. The purpose of this study is to pinpoint the existing gaps in service, establish priorities for service enhancement based on the significance and effectiveness of service characteristics, and evaluate the viability of creating waiting room facilities to aid in elevating service quality. The findings indicated that the most significant gap was identified in the disabled passengers' amenities, with a figure of (-1.74). Utilizing Importance Performance Analysis (IPA), four key factors were identified as top priorities for enhancement: information regarding security disturbances, service-related information, waiting area amenities, and accommodations for passengers with disabilities. The analysis of the viability related to the costs of constructing the Damri bus waiting area demonstrates that the endeavor is viable to proceed, exhibiting an IRR of 46%, a BCR greater than 1, and a positive NPV across all evaluated interest rates

Cost and Time Performance Analysis Using the Earned Value Method in the MCC (Motor Control Center) Warehouse Room Construction Project at Pt. Omya Plant Paciran Lamongan Aris Lukmanul Khakim; Budi Witjaksana; Jaka Purnama
Formosa Journal of Science and Technology Vol. 5 No. 6 (2026): June 2026
Publisher : PT FORMOSA CENDEKIA GLOBAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55927/fjst.v5i6.76

Planned Value (PV) represents the expected expenses for tasks designated for a particular timeframe and outlined in the financial plan, also referred to as the Budgeted Cost of Work Scheduled (BCWS). This figure is calculated by taking the proportion of intended progress as per the timeline and multiplying it by the expenses earmarked for the project as detailed in the Bill of Quantities (RAB). PV or BCWS = (percentage of planned progress) x (Budget) PV or BCWS calculation for Week 1. PV or BCWS = (percentage of plan) x (total budget for the project) PV or BCWS = (0. 07%) x (Rp. 2,270,000,000). PV or BCWS = Rp. 1,589,000. Earned Value (EV) or BCWP reflects the budgeted costs associated with work that has been finished, calculated by multiplying the percentage of actual progress by the budget. EV or BCWP = (percentage of actual progress) x (Budget) EV or BCWP calculation for Week 1. EV or BCWP = (percentage of actual progress) x (total budget for the project) EV or BCWP = (0. 07%) x (Rp. 2,270,000,000). EV or BCWP = Rp. 1,589,000. According to the assessment conducted, the project duration was completed 7 days ahead of the projected timeline of 133 days. The assessment indicated that the final expenses were below the contracted amount of Rp. 2,189,355,000, resulting in cost efficiency

Analysis of OHS Risk Management and Risk Impact on Project Implementation Time Using the Risk Breakdown Structure (RBS) Method in the Construction of the RKB MIN 5 Tulungagung Building Eko Budi Utomo; Budi Witjaksana; Jaka Purnama
Formosa Journal of Science and Technology Vol. 5 No. 6 (2026): June 2026
Publisher : PT FORMOSA CENDEKIA GLOBAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55927/fjst.v5i6.74

The construction of the New Classroom Building (RKB) at MIN 5 Tulungagung has potential Occupational Safety and Health (OSH) risks because it involves construction activities, work equipment, labor, and diverse project environmental conditions. This study aims to identify OSH risk factors, determine risk levels and priorities, and analyze the impact of dominant risks on project implementation time. The results show that there are 20 OSH risk factors classified into environmental, human, equipment, work method, and management/organizational factors. The highest dominant risk is the lack of internal communication and coordination among project parties, with a risk value of 12.240. Other priority risks include extreme weather 11.778, dust exposure due to construction activities 10.444, and lack of worker skills 10.427, which are classified as high risks, while not using personal protective equipment (PPE) 9.747 is classified as a moderate risk. No risks are classified as very high. Based on expert judgement, extreme weather has the greatest estimated delay of 1–7 days, while other risks may cause delays of 1–3 days. Therefore, OSH risk control needs to be implemented systematically to improve work safety, maintain work smoothness, and support timely project implementation

Dynamic System Simulation for Optimizing the Ready-to-Load Parking Capacity at the LCM Wharf, Ferry Port Abdurrahman Mahdy Al Faishal; Hanie Teki Tjendani; Budi Witjaksana
Formosa Journal of Science and Technology Vol. 5 No. 6 (2026): June 2026
Publisher : PT FORMOSA CENDEKIA GLOBAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55927/fjst.v5i6.71

The integration of the Trans-Java Toll Road has triggered induced demand and batch arrival patterns at the Ketapang Ferry Port, potentially creating structural bottlenecks due to space limitations. This study aims to determine the ideal capacity of the 6,170 m² ready-to-load parking area at LCM Piers (IV, V, and VI) to mitigate vehicle queues using a dynamic system simulation method (Powersim). Evaluation based on daily operational data for normal conditions and the peak season for the March 2026 Eid al-Fitr transportation period indicates that parking performance is ideal for the Class VII vehicle scenario with a Density Index of 0.57 (57% utilized), leaving 2,651 m² of idle space. Conversely, in the Class VIII vehicle scenario, land space utilization reaches saturation with a Density Index of 0.98 (98% utilized), leaving only 2% of the remaining space (123 m²). This critical condition triggers the highest level of warning (critical alarm), because a minor delay in the ship loading process will immediately cause a queue of vehicles to overflow outside the port authority or national road

Examination of Time Management Techniques Derived From Critical Path Method (CPM) Findings to Meet the Completion Goal For the Construction Project of the Central Kalimantan Public School Vendy Eka Saputra; Budi Witjaksana; Andi Patriadi
Formosa Journal of Science and Technology Vol. 5 No. 7 (2026): July 2026
Publisher : PT FORMOSA CENDEKIA GLOBAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55927/fjst.v5i7.118

The Central Kalimantan Public School Construction Project involves building activities at several sites with varying conditions, such as peat soil, difficulties in transportation, severe weather, and limitations in material supply. These factors could affect the overall expenses and timelines of the project, highlighting the need to analyze their impact on how well the project performs. This research intends to examine the timeline for the Central Kalimantan Public School Construction Project and assess how well the schedule is monitored through the Critical Path Method (CPM). A case study was conducted using both descriptive and evaluative techniques. The information gathered included the original contract, any modifications, schedules, and reports on work progress. The CPM analysis was performed to pinpoint the critical path and the key activities that could affect the project's duration. The findings suggest that the conditions of the site have an effect on the project's timeline. The CPM analysis identified vital activities that need to be managed to achieve the project's completion goals. Using the CPM approach can help in controlling the schedule and in making informed decisions during the project's implementation

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