Judul: Aplikasi Statistical Process Control (SPC) Dalam Pengendalian Bobot Bersih Beef Sausage Kemfood di PT Kemang Food Industries
Abstrak: Sausage is one of the most popular processed meat products. It is produceed from mixing of fine meat and flour or starch, with or without adding of additional substances. PT Kemang Food Industries is one of the most wellknown producer of processed meat products in Indonesia. Among the products which are produced by PT Kemang Food Industries are meatball, sausage and beef slice ham. The present study is focused on the Beef Sausage Kemfood. One of the most important parameter that needs to be controlled in processed meat is its net weight. In order to evaluate the production performance on this parameter, the data of net weight of beef sausages have been collected daily for two months. Their values were then analyzed using X-bar and R control charts. The result showed that production performance is in the condition of out of control state. Further analysis using Ishikawa diagram showed that the root cause can be grouped into four categories, i.e. management, method, human and machine. To make corrective action, a survey has been conducted to determine the ultimate cause of variation of net weight of Beef Sausage Kemfood. The survey showed that the corrective action have to be focused on the filler machine. Several suggestions to improve this matter have been proposed, such as : periodical calibration and maintenance, and consideration to purchase new filling machine
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Judul: Pengendalian Penolakan Produk Sosis di PT XYZ Menggunakan Statistical Process Control (SPC).
Abstrak: Masyarakat cenderung memilih makanan yang praktis untuk dikonsumsi, contohnya adalah makanan siap masak. PT XYZ merupakan salah satu industri pangan yang memproduksi makanan siap masak berupa produk sosis. Sosis merupakan pangan olahan yang terbuat dari daging halus atau campuran beberapa daging dan dicampur dengan atau tanpa penambahan bumbu-bumbu. Proses produksi sosis terdiri dari beberapa tahapan sehingga berpotensi adanya mutu produk yang tidak sesuai dengan standar dan spesifikasi perusahaan atau adanya penolakan produk (reject). Pengendalian mutu produk sosis dapat dilakukan melalui pendekatan statistik menggunakan metode Statistical Process Control (SPC). Penelitian ini bertujuan untuk mengidentifikasi faktor penyebab terjadinya reject sosis dan memberikan rekomendasi pengendaliannya. Berdasarkan interpretasi dari diagram Pareto menunjukkan bahwa jenis reject panjang mendominasi proses produksi sosis keseluruhan. Proses produksi sosis ayam merek X berada di luar batas kendali statistik yang ditunjukkan dengan adanya titik-titik di luar batas kendali pada bagan Individual Moving Range (I-MR). Diagram sebab-akibat menunjukkan bahwa terjadinya reject panjang disebabkan oleh beberapa faktor utama yaitu manusia, mesin, metode, material, dan lingkungan. Faktor-faktor yang memengaruhi manusia yaitu kedisiplinan, motivasi, dan keterampilan; faktor untuk mesin yaitu mesin stuffer, mesin pemotong, smoke house, dan perawatan mesin; faktor untuk metode yaitu persiapan proses awal produksi, pengaturan awal mesin, dan cara mengikat ujung sosis; faktor untuk material yaitu adonan dan selongsong sosis; sedangkan faktor untuk lingkungan yaitu suhu dan lantai. Langkah perbaikan yang dapat dilakukan diantaranya yaitu memperketat sortasi, meningkatkan kesadaran pekerja tentang pentingnya menjaga kualitas, dan menjaga performa mesin yang digunakan.
Keyword: mutu, peta kendali, reject, sosis, SPC

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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