Determining the route of vehicles in logistics has a vital function for logistics companies to reduce the total cost of distribution costs. One of the exciting problems in determining vehicle routes is the green vehicle routing problem with time windows (GVRPTW). This study aims to propose the Artificial Bee Colony (ABC) algorithm to solve the GVRPTW problem. This problem’s objective function is to minimize the total cost of distribution, which involves the total cost of fuel and late delivery costs. The ABC algorithm is applied to a case study of an Indonesian distribution company. Thirty customers and one distribution center were considered in this study. The results show that the ABC algorithm can minimize the total cost of distribution. In addition, the proposed algorithm produces a competitive total distribution cost compared to the nearest neighbor procedure.
Production scheduling is an important activity in manufacturing. Optimal
As the primary health reference center, a hospital is required to provide excellent quality services to each patient. The impact of the extreme physical and mental workload cause negligence in activities. It affects the quality of services provided by medical personnel. This study investigated the level of mental workload and physical workload in medical staff in a hospital. This study was conducted at 15 units in the hospital. The mental workload was assessed using the NASA-TLX Questionnaire. The physical workload analysis was carried out with the Heart Rate reserve percentage of medical personnel. The results of this study show that the mental workload on nurses in the ICU is higher than the other units. Whereas the calculation of physical load using% HR reserve turns out the head of the nurse in-unit class 1 has the highest value compared to the others unit. The statistical analysis showed there was a difference in the general practitioner workload toward the Head of the NursingAs the primary health reference center, a hospital is required to provide excellent quality services to each patient. The impact of the extreme physical and mental workload cause negligence in activities. It affects the quality of services provided by medical personnel. This study investigated the level of mental workload and physical workload in medical staff in a hospital. This study was conducted at 15 units in the hospital. The mental workload was assessed using the NASA-TLX Questionnaire. The physical workload analysis was carried out with the Heart Rate reserve percentage of medical personnel. The results of this study show that the mental workload on nurses in the ICU is higher than the other units. Whereas the calculation of physical load using% HR reserve turns out the head of the nurse in-unit class 1 has the highest value compared to the others unit. The statistical analysis showed there was a difference in the general practitioner workload toward the Head of the Nursing.
CV. Mebel Bima merupakan sebuah perusahaan yang bergerak dalam bidang pengerjaan kayu khususnya pembuatan berbagai model daun pintu dan kusen. Tipe aliran produksi di perusaaan adalah job shop dikarenakan pengerjaan setiap job memiliki aliran yang berbeda di setiap mesinnya. Penjadwalan produksi di perusahaan adalah diurutkan berdasarkan total waktu penyelesaian job terlama sampai yang terkecil. Permasalahan di perusahaan selama ini adalah besarnya makespan yang dihasilkan oleh penjadwalan dengan metode perusahaan sehingga perusahaan mengalami keterlambatan penyelesaian job dari waktu yang sudah ditetapkan sebelumnya. Berdasarkan masalah tersebut penelitian ini bertujuan untuk menentukan urutan pengerjaan job dengan makespan yang lebih kecil menggunakan algoritma jadwal non delay dengan prioritas SPT. Tahap-tahap dalam penelitian ini adalah dimulai dari observasi langsung di perusahaan, studi literatur, perumusan masalah, pengambilan data, pengolahan data, dan terakhir adalah pembandingan hasil penjadwalan. Metode penjadwalan produksi yang digunakan di perusahaan menghasilkan makespan sebesar 194,4 jam atau 25 hari kerja (1 hari terdapat 8 jam kerja), sedangkan usulan penjadwalan dengan menggunakan algoritma jadwal non delay menghasilkan makespan sebesar 168,79 jam atau 22 hari kerja, dengan demikian Penjadwalan dengan menggunakan algoritma jadwal non delay dapat menghemat total waktu pengerjaan sebesar 24,85 jam atau 3 hari kerja lebih 0,85 jam.
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