scholarly journals PENJADWALAN PROYEK DENGAN PENERAPAN SIMULASI MONTE CARLO PADA METODE PROGRAM EVALUATION REVIEW AND TECHNIQUE (PERT)

OPSI ◽  
2017 ◽  
Vol 10 (2) ◽  
pp. 150
Author(s):  
Widya Nurul Shofa ◽  
Irwan Soejanto ◽  
Trismi Ristyowati
Keyword(s):  
Monte Carlo ◽  
Program Evaluation ◽  
Project Scheduling ◽  
Completion Time ◽  
Raw Materials ◽  
Residential Development ◽  
Optimal Time ◽  
Conviction Rate ◽  
Project Completion ◽  
Causes Of Delays

PT At Taqwa Sejahtera has implemented of residential development that duration about 152 day. Due to delay in the supply of primary raw materials, the processing time getting longer or not accordance to planning schedule on October 27, 2017. The project delay have impact on the company which will given punishment.The aim of this study research to the evaluate the project implementation schedule and project scheduling for more optimal time, with the best probability, and minimize the influence of the causes of delays to the project completion time. Project scheduling processing is done by using Program Evaluation Review and Technique (PERT) and implementation with Monte Carlo simulation using Ms Excel software.Based on data processing, the calculation of the project point accelerated time to 147 days with cost Rp 417.315.909,25 and probability of 63%, whereas with the application of Monte Carlo simulus the average conviction rate is at 156 days with cost Rp 402,310,654.25 and probability of 94%.  

scholarly journals Program Evaluation and Review Technique Analysis of an Engineering Project

2017 ◽  
Vol 2 (1) ◽  
Author(s):  
Adetoye Aribisala ◽  
Adegboyega Otenaike ◽  
Olusegun Balogun ◽  
Lizzy Ofusori
Keyword(s):  
Program Evaluation ◽  
Time Management ◽  
Completion Time ◽  
Iron Ore ◽  
Critical Path ◽  
Analysis Data ◽  
Optimal Time ◽  
Financial Loss ◽  
Engineering Project ◽  
Project Completion

Between fifty to eighty percentof the projects known are not completed within the specified number of working days. Either the contractor was assessed liquidated damages or time extensions were authorized, necessitating additional manpower and / or extended working hours.The result in both cases was animmediate financial loss to the contractors; these losses were ultimately passed on to the company in general, contributing to spiraling project costs.Therefore, this paper examines and analysis data related to the project of the reactivation of line 1 for the production of iron ore concentrates of national Iron Ore Mining Company, Itakpe. Data collected involved the optimistic time, most likely and pessimistic times of completion of critical activities making up the project. This data was analyzed using the Program Evaluation and Review Technique(PERT), a MATLAB program was written to determine the critical path and the probability of project completion at a simulated time. It was found out that the project should have been completed in an optimal time of between 110 and 120 days as against the actual completion time of 180 days. The result of the simulated optimal completion time was compared to the actual completion time. Management agreed to adopt the PERT technique in future project works in the organization.

scholarly journals An optimal time incentive/disincentive -based compensation in contracts with multiple agents

2016 ◽  
Vol 16 (4) ◽  
pp. 35-53 ◽  
Author(s):  
S. Mahdi Hosseinian
Keyword(s):  
Risk Aversion ◽  
Completion Time ◽  
Optimization Problem ◽  
Risk Attitude ◽  
Theoretical Development ◽  
Optimal Time ◽  
Risk Averse ◽  
Multiple Agents ◽  
Time Saving ◽  
Project Completion

This paper establishes an optimal time incentive/disincentive-based compensation in a contract between a principal and a team of agents. The establishment is based on solving an optimization problem. In order to validate the paper's theoretical development practitioners were engaged in a designed exercise. The paper demonstrates that, at the optimum: the proportion of time incentive/disincentive compensation among agents with the same risk-attitude should reflect the levels of their contributions; the proportion of time incentive/disincentive among agents with the same level of contribution should be lowered for agents with higher levels of risk aversion; and the proportion of time incentive/disincentive to a team of risk averse agents should reduce, and the fixed component of the team fee should increase, when the agents in the team become more risk-averse or the level of the uncertainty in project completion time increases. The paper’s outcome provides guidance to those involved in contracts design for choosing the best way to reward (penalise) multiple agents, form a team, and allow for any time saving (overrun) through the terms of a contract.    

scholarly journals Implementation Of Program Evaluation And Review Technique (Pert) To Optimize Shophouse Development Projects

2021 ◽  
Vol 1 (1) ◽  
pp. 117-127
Author(s):  
Irma Ayu Kartini ◽  
Tasya Aspiranti ◽  
Asni Mustika Rani
Keyword(s):  
Program Evaluation ◽  
Project Management ◽  
Developing Country ◽  
Completion Time ◽  
Project Work ◽  
Development Projects ◽  
Work Time ◽  
Construction Company ◽  
Project Completion

Construction development in Indonesia is being intensively carried out as a characteristic that Indonesia is a developing country. CV. X is a construction company that has a project in the form of ten shophouses with three floors. The project is planned to start in August 2020 and be completed in December 2021 or for 68 weeks. The change of seasons becomes an obstacle in the work of the project that causes delays. Progress expected by CV. X in 2 months of project work is 8%, but the reality on the project progress field is only 6%. Therefore, this study aims to optimize existing work time so that the delay can be overcome. The method used in this study is Program Evaluation and Review Technique (PERT) with rainfall as the probability. The results of the study found that the project work time can be optimized by 3% and delays can be overcome because the project completion time becomes 66 weeks. The project is still ongoing, so there is still a possibility of error, therefore effective project management must still be considered. Usually in similar studies the probability of time or cost, while in this study use rainfall as the probability.

scholarly journals Credibility based chance constrained programming for project scheduling with fuzzy activity durations

2019 ◽  
Vol 9 (2) ◽  
pp. 208-215
Author(s):  
Oğuzhan Ahmet Arık
Keyword(s):  
Project Scheduling ◽  
Completion Time ◽  
Credibility Measure ◽  
Chance Constraint ◽  
Programming Approach ◽  
Chance Constrained Programming ◽  
Scheduling Problems ◽  
Project Completion ◽  
Fuzzy Event ◽  
Constrained Programming

This paper proposes a credibility based chance constrained programming approach for project scheduling problems with fuzzy activity durations where the objective is to minimize the fuzzy project completion time. This paper expresses the fuzzy events such as a project activity’s duration or project completion time with fuzzy chance constraints and the chance of a fuzzy event is illustrated with fuzzy credibility distribution. Due to uncertainty in durations of a project, fuzzy sets and fuzzy numbers can be used in order to illustrate the uncertainty and find a solution space for the problem. Therefore, fuzzy credibility based chance constraint technique is investigated for project scheduling problems with fuzzy activity durations considering the uncertainty or chance of a fuzzy event within a closed interval. In this paper, a fuzzy mathematical model and its crisp equivalent by using credibility measure and chance-constrained programming are given for project scheduling problems with fuzzy activity durations.

Using PERT to Optimise the Completion Time of Air-Conditioning and Mechanical Ventilation (ACMV) Project

2019 ◽  
Vol 892 ◽  
pp. 266-273
Author(s):  
Chuan Kian Pang ◽  
Noor Ajian Mohd-Lair ◽  
Yi Sheng Chua
Keyword(s):  
Mechanical Ventilation ◽  
Air Conditioning ◽  
Completion Time ◽  
Critical Path ◽  
Project Planning ◽  
Optimal Time ◽  
Planning And Scheduling ◽  
Project Completion ◽  
High Penalty ◽  
Completion Times

An air-conditioning and mechanical ventilation (ACMV) construction project involved many interrelated construction activities with varying durations and multiple dependencies. This paper focuses on the development of a best possible project planning and scheduling technique that can help the project manager to manage and complete the ACMV project in optimal time. The program evaluation and review technique (PERT) is used in this research. The PERT technique helps to determine the probabilities of various stages of the project by specified deadlines and identify the activities on the critical path that have high potential for causing delays in the project completion time. The completion times of 72, 76, 79, and 80 weeks were taken for the PERT analysis. Deadline of 72 weeks is the contractual period of the ACMV project as specified in the contract. Completion time of 76 weeks is the critical path of the project as analyzed by the PERT technique. The deadline of 79 weeks is the proposed completion time for the ACMV project whereas 80 weeks are the actual completion date of the project. The PERT analysis revealed that the project completion time of 72 weeks, which is as stated in the contractual completion time, yielded the probability of completion of 2.67% only. This analysis shows that the contractual period is impossible to be achieved and it is an unrealistic time setting. Further negotiation is required including changing or extending of the contractual completion time. The other completion times are able to be achieved but the company may need to face the high penalty costs due to the delays in completion time.

scholarly journals PENJADWALAN PROYEK PEMBANGUNAN JARINGAN DISTRIBUSI LISTRIK PERDESAAN

2017 ◽  
Vol 13 (1) ◽  
pp. 30-39
Author(s):  
Diqbal Satyanegara ◽  
Fauziah Nurunnajmi
Keyword(s):  
Project Scheduling ◽  
Completion Time ◽  
Distribution Network ◽  
Analytical Techniques ◽  
Development Project ◽  
Network Development ◽  
Project Completion ◽  
The Cost

This study aims to analyze the causes of the delay in the completion of the Banten Rural Distribution Network development project in 2015 undertaken by PT. X, and analyzed forecasts of delays in project completion and costs that contracting companies should issue in project completion. Analytical techniques used in this study using CPM and EVM approach. From the results of the study, it was identified that project scheduling planning was not yet optimal. Based on the analysis there are three jobs that are not listed in the scheduling planning of the project, so that the effect on the completion of the project completion time. The results of calculations performed using CPM, PT. X can shorten the time for 12 days from the realization of the project completion at a cost of Rp 1,786,244,000. If based on the EVM calculation, the cost incurred by PT. X amounting to Rp 1,703,909,250.   Penelitian ini bertujuan untuk menganalisis penyebab terjadinya keterlambatan penyelesaian proyek Pembangunan Jaringan Distribusi Listrik Perdesaan Banten tahun 2015 yang dikerjakan oleh PT. X, dan menganalisis prakiraan keterlambatan penyelesaian proyek dan biaya yang sebaiknya dikeluarkan perusahaan pengembang kontrak dalam penyelesaian proyek.Teknik analisis yang digunakan dalam penelitian ini menggunakan pendekatan CPM dan EVM. Dari hasil penelitian teridentifikasi perencanaan penjadwalan proyek yang masih belum optimal. Berdasarkan analisis terdapat tiga pekerjaan yang tidak tercantum dalam perencanaan penjadwalan pada proyek tersebut, sehingga berpengaruh pada pertambahan waktu penyelesaian proyek. Hasil perhitungan yang dilakukan menggunakan CPM, PT. X dapat mempersingkat waktu selama 12 hari dari realisasi penyelesaian proyek dengan biaya sebesar Rp 1.786.244.000. Jika berdasarkan hasil perhitungan EVM, biaya yang dikeluarkan PT. X sebesar Rp 1.703.909.250.

Bias in Pert Project Completion Time Calculations for a Real Network

1966 ◽  
Vol 13 (4) ◽  
pp. B-194-B-201 ◽  
Author(s):  
A. R. Klingel
Keyword(s):  
Completion Time ◽  
Real Network ◽  
Project Completion

scholarly journals A study to set-up a technological process for purification of Zinc scraps by using liquation method

2021 ◽  
Vol 8 (1) ◽  
pp. 36-43
Author(s):  
Ngoc Vuong Tran ◽  
Manh Hung Luong ◽  
Dinh Dang Nguyen
Keyword(s):  
Zinc Oxide ◽  
Raw Materials ◽  
Time Factors ◽  
Pilot Scale ◽  
Raw Material ◽  
Optimal Time ◽  
Fe Content ◽  
Technology Process ◽  
Zn Content ◽  
Set Up

Zinc scrap is a source of raw material for zinc oxide production. However, to qualify the requirement of raw material for zinc oxide (99.5%) production, refining this source is needed. Many methods are considered such as rectification, chemical method, etc., but difficult to apply on an industrial scale. This workfocused on the investigation of the influence of temperature and time factors for asessing the possibility of applying liquation method for the purification of impurities from scrap zinc.The experiment results show that the optimum temperature of liquation to remove Pb,Fe from zinc scrap is in the range of 440-450°C, the optimal time of the process is 8h for the pot with 8cm in height and 6cm in diameter (the quantity of raw zinc sample is about 2kg / batch), then we can obtain about 80% of zinc metal with an average Zn content of about 97, 0%, both Pb and Fe content decreased to a range from 0.35 to 0.4%, and 1.0 to 1.1%, respectively, which meet the requirement of raw materials for the production of high quanlity ZnO ( 99,5 %). Based on the parameters obtained on lab-scale, a trial on pilot scale of 250 kg / batch was conducted, The result confirms that the quality of the products meets the requirement of raw materials for production of high quality ZnO (99.5%) and a technology process for refining zinc scrap by the liquation was proposed.

scholarly journals ASSESSING THE FACTORS CAUSING PROJECT COMPLETION DELAYS IN THE CONSTRUCTION SECTOR OF OMAN USING SEM-PLS

2020 ◽  
Vol 8 (3) ◽  
pp. 900-912 ◽  
Author(s):  
Iman Suleiman Al Maktoumi ◽  
Firdouse Rahman Khan ◽  
Ahmed Rashid Suwied Al Maktoumi
Keyword(s):  
Structural Equation ◽  
Construction Projects ◽  
Goodness Of Fit ◽  
Raw Materials ◽  
Equation Modeling ◽  
Related Factors ◽  
Formative Measurement ◽  
Project Completion ◽  
Measurement Models ◽  
Process Allocation

Purpose: The objectives of the study were to investigate the causes of the delays to analyze the factors causing the construction delay in Oman and to investigate the effects of such delays. Design/methodology/approach: To carry out this study 210 samples were collected through a well-defined questionnaire from the construction stakeholders viz. the consultants, contractors, and the clients who were selected on a random sampling basis. Smart PLS for Structural Equation Modeling (SEM) technique was used to analyze the data to obtain the formative measurement models, the structured model, and the goodness of fit. Findings: The results of the study reveal that the client-related factors, equipment-related factors, and material related factors have a significant impact on the completion delay in construction projects. The findings of the study also revealed that the Client related factors were – Delay in providing services, Delayed decision-making process, Allocation of insufficient time. Equipment related factors were – Existing low productive equipment, Unskillful Equipment operator, Breakdown of equipment and Outdated equipment; Material related factors were – Delay in supply of raw materials, Non-availability of materials, Change of materials during construction, Non-availability of accessories and Damaged materials. Research limitations/Implications: The present study covers the stakeholders of the construction projects from selected regions only. The future studies can be extended to other projects and other regions as well. Social implications: The study suggested that the clients’ cooperation especially in providing the contractors with the necessary equipment, facilities, and sufficient time will avoid such delays of the construction projects in Oman. Originality/Value: Only very few have examined the completion delay of the construction projects in Oman using SEM-PLS and it is a first-hand study of its kind and the results will be useful to the stakeholders.

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