Judul: Kontrol Optimum Sistem Inventori-Produksi dengan Laju Kerusakan Barang Menyebar Weibull
Abstrak: Inventory control is a natural action that everyone undertakes, as we keep foods, clothes, pens, papers, and many other goods. For companies, inventory control is an important thing to do because it manages the capital assets and organizes the availability of items for customers. Production-inventory system is a dynamic model (a function of time) so that it can be presented as a problem of optimal control. This paper is concerned with an optimal control of a production-inventory system with deteriorating items. It is assumed that the deterioration rate follows a two parameters Weibull distribution. In this work we investigate continuous and discrete models. Optimal condition for continuous model is derived by using Pontryagin maximum principle, where the solution is a second order differential equation which solved numerically by using finite difference method. While discrete production-inventory system is solved by Lagrange technique, with the optimal solution is obtained by solving difference equations recursively.
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Judul: Pengoptimuman Masalah Persediaan dalam Menghadapi Penawaran Diskon dan Dua Jenis Biaya Backorder
Abstrak: Persediaan adalah stok bahan yang digunakan untuk mempermudah produksi pada suatu perusahaan manufaktur. Perusahaan perlu mampu mengatur jumlah kuantitas produk dan waktu pemesanan yang efektif. Terkadang perusahaan tidak memiliki persediaan yang cukup sehingga mengganggu proses pendistribusian produk. Kondisi tersebut disebut dengan backorder. Selain kondisi backorder, terkadang pemasok juga memberikan potongan harga kepada perusahaan manufaktur. Penawaran diskon akan mengakibatkan perusahaan membeli kuantitas pesanan khusus yang jumlahnya perlu ditentukan agar mendapatkan keuntungan maksimal. Salah satu model untuk masalah persediaan adalah Model Economic Order Quantity (EOQ). Karya ilmiah ini membahas Model EOQ dengan diskon dan Model EOQ dengan backorder yang dikembangkan untuk tiga skenario berbeda. Setiap skenario dibedakan berdasarkan waktu dan objek penerapan diskon. Selanjutnya, akan dihasilkan formulasi masalah persediaan untuk menentukan kuantitas pesanan khusus agar biaya total persediaan minimum pada setiap skenario., Inventory is the stock of materials used to facilitate production in a manufacturing company. Companies need to be able to manage the number of quantities and order time effectively. Sometimes the company does not have enough inventory, it interferes with the product distribution processes. This condition is known as backorders. In addition to backorder conditions, sometimes suppliers also provide price discounts to manufacturing companies. A discount offer makes the company buy an additional order quantity whose amount needs to be determined to get maximum profit. One of the models for inventory problems is the Economic Order Quantity (EOQ) model. This paper discusses the EOQ Model with discounts and the EOQ Model with backorders developed for three different scenarios. Each scenario based on the time and object of applying the discounts. Next, an inventory problem formulation is generated to determine the number of additional orders so that the total inventory cost is minimum in each scenario.
Keyword: backorder, discount, EOQ model, inventory control

Judul: Hubungan Perilaku Menonton Orang Pinggiran di Trans 7 dengan Empati Remaja di Desa Cihideung Ilir Kecamatan Ciampea Bogor
Abstrak: This study aimed to analyze the correlation between internal factors adolescense with viewing behavior, the correlation between external factors adolescense with viewing behavior, and correlation viewing behavior with adolescense empathy. The research sample was adolescense in Cihideung Ilir Village Ciampea District Bogor who had seen the program in “Orang Pinggiran” Trans 7. The results of the study explain that the gender associated with the duration of the watch. Age, level of education, occupation, and television ownership was not associated with viewing behavior. On testing the interaction with family and interaction with friends wasreal associated with viewing behavior. Finally, the viewing behavior of “Orang Pinggiran” Trans 7 was not associated with adolescense empathy.
Keyword: empathy, viewing behavior, external factors, internal factors