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Abstrak :
ABSTRAK
This research proposes a mathematical model of the Vehicle Routing Problem with Compartment (VRPC) by considering split delivery, multi product, and time windows. VRPC is variant of VRP which is an extention of the Capacitated Vehicle Routing Problem (CVRP) by considering the used of compartment in the vehicle. Compartment is used to separate different product to be distributed. The application of the VRPC concept in a real system can be found in the distribution system of fuel, oil, recycled waste, or food distribution. The mathematical model is used to determine the route that minimize the distance. AMPL software and CLPEX solver is used to create the mathematical programming of the model and solve it. The proposed mathematical model is Mixed Integer Nonlinear Programming (MINLP). Numerical experiments is conducted to illustrate the use of the model. The experimental results show that the model passed the verification and validation tests.

Abstrak :
ABSTRACT
This article extends the Economic Order Quantity with backorders (EOQB) model with a mode of oversea shipping cost, namely full container load (FCL), by introducing a constraint of containers' capacity limitation to the model. Exact algorithm is proposed for straightforwardly solving a single product EOQB with shipping cost. The illustrative examples show that the proposed method yields the optimal solutions without using any complicated mathematical calculations. The model of multi-product EOQB with shipping cost is also presented. It is more complicated than the first one. We make use of the method of Lagrange multipliers to solve it systematically. The acceptable near-optimal solutions can be found; the differences ranges from 0.08-4.96% when compared to those obtained from the Excel solver. However, the second proposed method needs a skilled analyst to solve it on a spreadsheet.

Abstrak :
Penelitian ini mengenai pemodelan untuk penjadwalan proses produksi pada industri pembuatan silicon polished wafer 5 - dan 6 - . Proses produksi untuk kedua produk ini memiliki tipikal flexible flow shop dengan variasi type barang mencapai 12 jenis. Setiap type barang harus melalui empat tahapan proses yang harus dilakukan secara berurut. Adanya limitasi fleksibilitas proses pada tiga buah tahapan menyebabkan masalah penjadwalan menjadi kompleks Pendekatan yang dilakukan untuk memecahkan masalah penjadwalan ini adalah dengan menerapkan dua metode dispatching rule, yaitu SPT (shortest processing time) dan EFT (earliest finish time). Metode lain yang digunakan adalah pengelompokan unit pesanan ke dalam sebuah family untuk meminimalkan kendala limitasi fleksibilitas proses pada dua buah tahapan. Kombinasi ketiga metode ini dituangkan ke dalam suatu algoritma multiproduct-multistage dan diaplikasikan pada inisialisasi solusi. Dari inisialisasi solusi ini dihasilkan penjadwalan awal untuk masing-masing tahapan. Optimasi dilakukan terhadap inisisalisasi solusi dengan menggunakan Algoritma Genetika. Algoritma Genetika akan mencari solusi terbaik yang mendekati optimal melalui serangkaian proses seleksi terhadap sekumpulan alternatif solusi yang ada. ......The study concerns in modeling the production schedule of 5' and 6' Silicon Polished Wafer manufacturing. The process of both products is categorized as flexible flow shop with 12 different types of product. Each product is processed through four stages with fixed sequence. There are some limitation of process flexibility among three of four stages that also causes the scheduling become difficult to arrange. Some dispatching rule is applied to solve the schedule problem. SPT (shortest processing time) and EFT (earliest finish time) is the two of dispatching rule which used for this kinds of problem. The other method that also carried out with those two dispatching rule is job families approaching. Job families approaching will minimize the effect of limited process flexibility. Those combined methods will be developed to be an algorithm called multiproduct-multistage algorithm and applied to the initial solution. The initial solution consists of the schedule of each stage. Initial solution is optimized by using Genetic Algorithm. Genetic Algorithm is search process of the best solutions among possible solutions by simulating the natural evolutionary process.

Abstrak :
Terkadang realisasi kebutuhan pengembangan aplikasi web baru sudah diimplementasikan sebagian pada aplikasi web lain. Harusnya efisiensi pengembangan dapat ditingkatkan dengan me-reuse realisasi tersebut dan mengurangi jumlah kebutuhan yang diimplementasikan dari awal. Developer menyelesaikan kasus tersebut dengan pendekatan clone-and-own yang memungkinkan penggunaan fungsionalitas suatu perangkat lunak pada perangkat lunak lain. Meskipun meningkatkan efisiensi pengembangan, namun clone-and-own menimbulkan masalah maintainability pada perangkat lunak yang sudah dikembangkan. Masalah tersebut dapat diatasi dengan pendekatan alternatif seperti paradigma software product line engineering (SPLE) yang efisiensinya dapat ditingkatkan dengan konsep multi product line (MPL). Sayangnya, SPLE dan MPL belum umum digunakan untuk mengembangkan perangkat lunak web karena kurangnya web framework yang menunjang kedua pendekatan tersebut. Hal ini yang mendasari implementasi WinVMJ framework sebagai web framework untuk mengembangkan aplikasi web dengan SPLE dan MPL. Framework ini belum menerapkan alur kerja SPLE secara menyeluruh, sehingga validitas perangkat lunak tidak terjamin. Untuk melengkapi alur kerja SPLE WinVMJ, penelitian ini mengintegrasikannya dengan FeatureIDE. Integrasi dilaksanakan dalam tiga tahap: merancang alur kerja SPLE, mendefinisikan kumpulan artefak yang diperlukan untuk pengembangan perangkat lunak, dan implementasi plugin bernama WinVMJ composer untuk memproses kumpulan artefak yang didefinisikan. Alur kerja SPLE WinVMJ berhasil dilengkapi dengan WinVMJ composer yang mampu memproses artefak dari FeatureIDE dan melakukan validasi produk secara menyeluruh. Selain itu, evaluasi WinVMJ composer juga menunjukkan adanya keunggulan penerapan MPL dan penyusunan produk dibandingkan WinVMJ framework. ......Sometimes the realization of new web application development needs has been partially implemented in other web applications. Development efficiency should be increased by reusing the realization and reducing the number of requirements implemented from scratch. Developers solve this case with a clone-and-own approach that allows using the functionality of one software on another. Although this approach improves development efficiency, clone-and-own causes maintainability issues in the developed software. This problem can be overcome by alternative approaches, such as the software product line engineering (SPLE) paradigm, whose efficiency can be increased by the multi-product line (MPL) concept. Unfortunately, SPLE and MPL are not commonly used to develop web software due to the lack of web frameworks that supports them. This issue underlies the implementation of the WinVMJ framework as a web framework for developing web applications with SPLE and MPL. This framework has not fully implemented the SPLE workflow, which causes a lack of software validity. To complete it, this research integrates it with featured. The integration is carried out in three stages: designing the SPLE workflow, defining the artifact set for software development after integration, and implementing a plugin named WinVMJ composer to process the defined artifacts set. The WinVMJ's SPLE workflow is completed with WinVMJ composer, which can process FeatureIDE's artifacts and perform thorough product validation. In addition, the evaluation of the WinVMJ composer also shows the advantages of implementing MPL and product compilation compared to the WinVMJ framework.

Abstrak :
Dewasa ini dengan adanya digitalisasi, permintaan atas teknologi semakin besar dan