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Adityawan Sigit
Universitas Islam Indonesia
Engineering

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STUDI KOMPARASI METODE EOQ DAN POQ DALAM EFISIENSI BIAYA PERSEDIAAN MATERIAL PAVING BLOCK Adityawan Sigit
TEKNISIA Vol. XXI, No. 1, Mei 2016
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

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Abstract

Construction materials project is one of the businesses in the construction project to provide building materials in setting up a building. Rapid increasing development causing many businesses engaged in the field of construction materials. In its activities, the company is in dire need of accurate, relevant and efficient information. Information is not only needed for decision-making, but also for planning and controlling. One of the most important information is inventory information. Inventory information will determine the survival of the company due to lack of inventory. Therefore, the company needs inventory control calculation, or excess inventory will have direct impact on the survival of the company. This paper has objective of sand material analysis for paving block production. Inventory control and material measures that will be used to analyze are Economic Order Quantity (EOQ) and Period Order Quantity (POQ). The case study in this research is in the company of the paving block Merapi Volcanic Materials Innovation Centre - Islamic University of Indonesia (PIMVM - UII). Object of this research is on the sand material inventory. The data to be processed is the data of volume requirements, the cost of ordering, purchasing and storing of sand material. The data will be processed using the method Inventory Control EOQ and POQ. The result of this research showed the cost of EOQ is Rp. 22.505.098,-, and the cost of POQ is Rp. 44,577,478,-. From the results of these two methods, the difference in the price of sand on the EOQ is 49.5% less expensive than the POQ. It is because the cost of storage on the POQ greater than EOQ so the costs for materials become more expensive. Thus, the optimal inventory control methods in the production of paving blocks PIMVM-UII is EOQ.
OPTIMALISASI BIAYA DAN WAKTU PROYEK MENGGUNAKAN METODE CRASHING DENGAN PENAMBAHAN WAKTU KERJA (LEMBUR) DAN SISTEM KERJA SHIFT Adityawan Sigit
TEKNISIA Vol. XXIII, No. 2, November 2018
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

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On every project construction often found problem about delay work project, this happen consequence existence difference condition location project, change design, weather or error in planning project. Consequence from delay work project this happen accretion cost project and project finished through from the planned time. Development Project and Development of Magelang Type B Hospital located on Jl. Raya Magelang -Yogyakarta, Mungkidan, Village Danurejo, District Mertoyudan, Regency Magelang, Central Java is project development and development House sick beforehand. Moment implementation development project experience delay because of factor where the climate the beginning of the implementation process project enter season rainy day. With existence problem that is then will do analysis schedule construction with use PDM method ( Precedence Diagram Method ) on Development Project and Development of Magelang Type B Hospital use method acceleration (crashing) with additions time work ( overtime ) 1 hour, 2 hours, 3 hours and working hours shift . Where aim from analysis that is for knowing the total time and cost project and knowing time acceleration (crashing) efficient and costs economical. From the destination research this obtained results analysis in a manner economical cost acceleration (crashing) with working hours more shift economical with total costs project as big as Rp. 13,881,934,901.31 and for optimal duration time project the fastest that is with acceleration (crashing) additional working hours (overtime) 3 hours with duration time project finished for 154 days or 56% more fast from normal duration is 350 days.
EVALUASI BIAYA DAN WAKTU PADA PROYEK PENGGANTIAN JEMBATAN DENGAN MENGGUNAKAN METODE KONSEP NILAI HASIL Adityawan Sigit
TEKNISIA Vol. XXIV, No. 2, November 2019
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/teknisia.vol24.iss2.art6

Abstract

On the implementation of project, there could have been problem in performance of time and cost that caused project that had been completed not to go according to plan. Therefore, performance evaluation is needed so that project can be carried out as planned and can also evaluate of project performance. In this research, time and cost performance will be evaluate using the earned value concept method in the Project for Replacement of the Nanga Tepuai-Nanga Semangut Section Bridge. Earned Value Concept can provide information about  progress position of project time and cost performance in a certain period of time. The stages of this research begin with data collection of S-Curves, RAB, Weekly Progress Report and Financial Report. Next, determine three indicators, that is BCWS, BCWP and ACWP, which is then used to analyze the Schedule Variance, Schedule Performance Index, Cost Variance, Cost Performance Index, Estimation at Schedule, and Estimation at Completion. The result of this research showed, from time performance, in month-1 until month-6, value of SV is postitive and the value of  SPI is more than 1, which means that the project is implemented faster than plan, and in month-7 the value of SV is 0 and the value of SPI is 1, which means that the project is implemented according to the plan. About cost performance, in month-1 the value of CV is negative and the value of CPI is less than 1, which means the costs incurred for implementating more than the plan, and in month-2 until month-7 the value CV is positive and the value of CPI is more than 1, which means the costs incurred for implementating less than the plan. The best EAS value is obtained in reporting month-2, it’s 3,63 months. The best EAC value is obtained in reporting month-4, it’s Rp. 7.239.951.844,01.
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