Linear scheduling with multiple crews based on line-of-balance and productivity scheduling method with singularity functions

2016 ◽  
Vol 70 ◽  
pp. 38-50 ◽  
Author(s):  
Yi Su ◽  
Gunnar Lucko
Author(s):  
Juneseok Yang ◽  
David Arditi

Linear scheduling method (LSM) is a scheduling method that is based on achieving a continuous flow of resources as well as precedence requirements. Although LSMs have recognized strengths in dealing with resource-intensive projects that are composed of repetitive activities, LSMs are not used extensively. This study proposes a staff-technology fit model that aims to measure the extent to which the features provided by LSM match scheduling staff experience, know-how and capabilities. The aim is to understand why LSM is not used as extensively as expected in construction scheduling. A questionnaire survey was administered to professionals listed in the directory of the Construction Management Association of America (CMAA) to measure staffing-technology fit in LSM applications. Research findings indicate that LSM applications satisfy user requirements in construction scheduling by (1) providing information that is useful to project participants depending on their position and function in the project organizations, (2) presenting graphics that are easy to understand, and (3) providing ease in communication. Research findings also reveal that LSM is not only a scheduling tool but also a control tool. However, the findings also point out that (1) LSM schedules require much time and effort to produce, (2) there are only very few commercially available software programs capable of running LSM schedules, and (3) there are not enough training opportunities for project managers and their staff to learn how to use LSM.


2017 ◽  
Vol 4 (1) ◽  
pp. 1-8
Author(s):  
Arthur Suryadharma

Proyek konstruksi jalan adalah contoh dari proyek linear, dimana terdiri aktivitas – aktivitas yang berulang dari unit yang satu ke unit berikut. Oleh karena itu tipe proyek ini butuh perencanaan penjadwalan yang tepat. Linear Scheduling Method (LSM) adalah teknik penjadwalan yang tepat untuk menjadwalkan unit – unit aktivitas proyek linear secara berkesinambungan sehingga terhindar dari idle time. Pada penelitian ini dilakukan pembuatan software LSM yang dapat menjaga kesinambungan kelompok kerja, disamping itu dapat menjadwalkan aktivitas – aktivitas agar terjadwal berdasarkan urutan yang ditentukan. Studi kasus proyek jalan digunakan pada penelitian ini untuk menguji software yang dibuat. Pembuatan software LSM menggunakan bantuan Visual Basic Software pada Microsoft Excel. Software yang diimplementasi pada proyek jalan menunjukkan kemampuan software yang dibuat untuk menghasilkan durasi proyek tanpa adanya idle time pada perpindahan kelompok kerja dan menjaga hubungan ketergantungan antar aktivitas.


2018 ◽  
Vol 33 (10) ◽  
pp. 864-884 ◽  
Author(s):  
Yuanjie Tang ◽  
Quanxin Sun ◽  
Rengkui Liu ◽  
Futian Wang

Author(s):  
Juneseok Yang ◽  
David Arditi

Although the general consensus is that linear scheduling methods (LSMs) are quite powerful, their use in construction has been very limited. The linkage between the characteristics of scheduling methods and the requirements of the tasks performed by schedulers has been an on-going concern in the construction industry. This study proposes a “task-technology fit” model to understand why LSMs are not being used as extensively as expected. The model aims to determine whether the characteristics of LSM (technology) satisfy the duties and obligations of construction schedulers (tasks). By scrutinizing the task-technology fit in LSM applications, deficiencies can be detected which hinder the wider use of these methods in the industry. A questionnaire survey was administered to measure task-technology fit in LSM applications. The target population included schedulers, project managers, construction managers, and other professionals listed in the directory of the Construction Management Association of America (CMAA). The findings indicate that LSM is effective in repetitive projects and is able to provide a smooth and efficient flow of resources by adjusting activities’ rate of production. In addition, research findings point out that LSM effectively shows activity sequences as well as progress. However, the findings also reveal that LSM is not applicable when reliable resource data are not available. It should also be noted that very few software packages that perform LSM scheduling are commercially available on the market.


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