Abstract-Shipping company is a company that runs its business by operating the ships or other businesses that are closely related to the ship. A ship has a main engine and some auxiliary engines to support the ship performance. It needs to do maintenance of engines so that the ship can operate properly. This engine maintenance is replacement of the old engine components with the new ones if the running hours of the components are over. Therefore, in the ship, the spare parts must always be available at least one for each engine component. During this time, the company has experienced a difficulty in determining the time of spare part ordering. When the running hours of engine components are over, the spare parts were not yet available. Then, Petri Net and Max Plus Algebra model will be built to schedule the ordering of ship engine component's spare part based on the ordering flow and the running hours of engine components. The Petri Net based on the Max Plus Algebra obtains maximum time to order the spare part so that it produces the ship engine component's spare part ordering schedule in running hour form and date. Therefore, spare part of each ship engine component is always available so that the installation can be timely and never be late.Index Terms-Max-plus algebra, Petri nets, Scheduling of spare part ordering.
⎯In this paper, it is discussed notion of maxplus algebra and their properties. A model of flow shop production system and analyze the dynamical behavior of the system for scheduling problems are derived by means of max-plus algebra. The solutions of these problems are that the optimal sequence of jobs and the regular scheduling are obtained.
Pendahuluan, Masalah hipertensi pada lansia dikarenakan adanya riwayat hipertensi dalam keluarga, kelebihan berat badan yang diikuti dengan kurangnya kepatuhan dalam diet, dikarenakan perubahan secara global dengan mudahnya mendapatkan makanan siap saji membuat konsumsi sayuran segar dan serat berkurang, kemudian konsumsi garam, lemak, gula dan kalori yang terus menerus meningkat. Tujuan, penelitian ini adalah Menganalisa Pengaruh senam Yoga terhadap penurunan tekanan darah pada lansia yang mengalami hipertensi. Desain, penelitian ini adalah pra eksperimen one group pre test post test desaign. Populasinya semua lansia hipertensi di Desa Plandi Kecamatan Jombang Kabupaten Jombang yang berjumlah 68 orang. Tehnik sampling menggunakan simple random samplingdengan sampelnya sejumlah 20 orang. Instrumen penelitian menggunakan lembar observasidengan pengolahan data editing, coding, scoring, tabulating dan uji statistik menggunakan Wilcoxona = 0,05. Hasil, penelitian tekanan darah pada lansia yang mengalami hipertensi sebelum senam yogaadalah termasuk dalam kategori sedang sejumlah 14 responden (70%). Tekanan darah pada lansia yang mengalami hipertensi sesudah senam yoga adalah termasuk dalam kategori normal tinggi sejumlah 11 responden (55%). Uji Wilcoxon menunjukkan bahwa nilai signifikansi p = 0,00 <a (0,05), sehingga H0 ditolak dan H1 diterima. Kesimpulan, Penelitian ini dapat disimpulkan bahwa ada Pengaruh senam Yoga terhadap penurunan tekanan darah pada lansia yang mengalami hipertensi. Kata Kunci : Hipertensi, lansia, tekanan darah, yoga.
Abstract-Sugar is the main trading commodity besides as basic human needs and be a source of energy and mostly traded in the form of solid crystals of sucrose or crystal sugar with cane as raw materials. Sugar production process is very complicated because it had to pass through various stages that require considerable time. The number of machines used in production system affects the complexity in the calculation of production scheduling. In addition, if there are errors in analyzing the operating time that is different for each product, it will cause a chaos in the production scheduling. These conditions encourage us to conduct a study on the production flow or flow lines with buffer. The buffer is used on multiple processors as a placeholder for semi-finished material before it is processed in the next processors. Buffers are used in the form of vessels with varying volume. In this study, the max-plus algebra is the method used to obtain crystal sugar production scheduling system in the sugar factory. From the flow lines that have been made then we derive a model of max-plus algebra to obtain a production schedule that starts with the milling process to obtain crystal sugar. Based on the max-plus algebra model, we also obtained sugar output schedule and some kind of waste. In addition, we obtained two periodicities of each processor, that is from milling processor until sulfitation of thick juice processor with periodicity 177.64 minutes and from vacuum pan A processor until mixer D2 processor with periodicity 1592.63 minutes, from these periodicities, we obtain a periodic production schedule for each processor.
AbstrakDalam paper ini dibahas pengertian dari aljabar maxplus dan beberapa sifat-sifatnya serta diberikan suatu contoh aplikasi dari aljabar maxplus. Selanjutnya dibahas suatu model sistem antrian satu server dalam aljabar maxplus.
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