Optimasi Trim Loss menggunakan Integer Linear Programming pada Cutting Stock Problem untuk industri meubel (Studi Kasus pada UD. Flybers)

Trim loss merupakan kerugian yang timbul dari hasil pemotongan yang tidak optimal. Trim loss dipengaruhi beberapa faktor salah satunya yaitu peletakan pola pemotongan yang kurang tepat. Trim loss dapat diselesaikan dengan beberapa metode salah satunya menggunakan metode cutting stock. cutting stock digunakan pada pengoptimalan pemotongan sisa material yang tidak dapat digunakan lagi. Pada cutting stock dipengaruhi oleh masalah pola pemotongan disebut cutting stock problem(CSP). CSP dapat diselesaikan dengan menggunakan pendekatan integer linear programming (ILP). ILP adalah salah satu model dalam program linear yang variabel keputusannya berbentuk bilangan positif atau nol.

Linear Integer Optimization Model for Two-Stage Guillotine Cutting Stock Problem Using Branch and Bound Method in the Garment Industry

This paper discusses the Two-Stage Guillotine Cutting Stock Problem (2GCSP) in the garment industry, namely how to determine the two-stage guillotine pattern that is used to cut fabric stocks into several certain size t-shirt materials that are produced based on the demand for each size of the shirt. 2GCSP is modeled in the form of Linear Integer Optimization and finding solutions using the Branch and Bound method. In this paper also presented a Graphical User Interface with Maple software as an interactive tool to find the best fabric stock cutting patterns. The results show that the optimal solution can be determined by solving numerically using the Branch and Bound method and Maple optimization packages. The solution is shown with an illustration of the pattern and the amount of fabric cut based on the pattern.

Optimization of the flat stock cutting process by hydroabrasive jet

This article focuses on the key results of hydroabrasive flat stock cutting research. The forming process is described and its theoretical investigation is presented. The theoretical dependence for the roughness determination of the surface cut is set. Experimental results of the process investigation confirming their theoretical adequacy are put forward. The next steps of process optimization within the framework of modern production are allocated.

Efektivitas Pemberian IAA, IBA, NAA, dan Root-up pada Pembibitan Kesemek

<p align="center"><strong><em>ABSTRACT</em></strong></p><p><em>Oriental persimmon (<span style="text-decoration: underline;">Diospyros</span> <span style="text-decoration: underline;">kaki</span> L.) originated from and has mainly been cultivated in China, Korea, and Japan, and currently it is cultivated in Batu, Kuningan, and Brastagi regions, Indonesia. Success in propagating persimmon in Indonesia has been limited. The objective of the study was to determine propagation techniques through root cutting supplemented with auxin treatment. All seedlings from root stock cutting</em><em> </em><em>supplemented with 100 ppm of either indoleacetic acid (IAA), indolebutyric acid (IBA), α-napthaleneacetic acid (NAA), or Root-up, and control. The results showed bud form stem or root cuttings treated with IAA, NAA and Root-up 100 ppm emerged earlier than IBA 100 ppm and control.</em><em> </em><em>The percentage of mortality of Root-up 100 ppm treatment and control cuttings was the highest (50%) than the others treatments. IAA and IBA treatments stimulated larger number of shoot, 16.5 and 17.0 shoots, respectively. The number of leaves was higher in plant treated with IAA 100 ppm (20.8 leaves). </em></p><p><em>Keywords: auxin, <span style="text-decoration: underline;">Diospyros</span> <span style="text-decoration: underline;">kaki</span> L., germination, leaf number, root stock</em></p><p align="center"><strong><em> </em></strong></p><p align="center"><strong><em> </em></strong></p><p align="center"><strong>ABSTRAK</strong><strong> </strong></p><p>Tanaman kesemek atau oriental persimmon (<em>Diospyros kaki </em>L.) banyak dibudidayakan di China, Korea, serta Jepang, dan saat ini banyak ditanam di Indonesia seperti di daerah Batu, Kuningan, dan Brastagi. Keberhasilan pembibitan kesemek di Indonesia masih rendah. Penelitian bertujuan untuk memperbanyak tanaman secara vegetatif dari pemisahan tunas akar dengan perlakuan auksin guna mendukung pengembangan pembibitan tanaman kesemek. Perbanyakan tanaman dilakukan dengan tunas akar yang direndam dengan auksin (IAA, IBA, NAA, dan Root-up; masing-masing 100 ppm), serta perlakuan kontrol. Hasil penelitian menunjukkan perlakuan IAA, NAA dan Root-up 100 ppm menghasilkan tunas lebih awal dibandingkan dengan kontrol dan IBA 100 ppm. Tingkat kematian bibit tertinggi mencapai 50% terjadi pada perlakuan Root-up 100 ppm dan kontrol. Jumlah tunas terbanyak dihasilkan oleh perlakuan IAA dan IBA sebanyak 16.5 dan 17.0 tunas. Jumlah daun terbanyak dihasilkan oleh perlakuan IAA 100 ppm (20.8 helai).</p><p>Kata kunci: auksin, <em>Diospyros kaki </em>L., jumlah daun, muncul tunas, tunas akar</p>