Judul: Quality Control for Reducing Deffect of Canned Champignon Products in Cans with Six Sigma Method at PT Suryajaya Abadiperkasa
Abstrak: Canned champignon is one of the superior products of PT Suryajaya Abadiperkasa. When there are many defects on the final product, i.e. the quality does not meet the company standard, then it will be resulted in the rejection of the products. Defect canned champignon products in PT Suryajaya Abadiperkasa consists of six categories that include broken, brown spot, stem too long, size, miss forming, open veil. The implementation of DMAIC (Define, Measure, Analyze, Improve, Control) and six sigma method successfully evaluates the quality of canned button mushroom products at PT Suryajaya Abadiperkasa. Broken, size, and openveil are the three main defect that most affect the quality of canned button mushroom products because it covers 81.50% of production before repairs are made. The value of defect per million opportunities (DPMO) and sigma canned button mushroom products of PT Suryajaya Abadiperkasa before improvement was 379,459 and 1.81 respectively. The values of DPMO and sigma canned button mushroom products after improvement were 245,307 and 2.19 respectively. Improvement efforts by conducting regular supervision and briefing to workers have been shown to lower the DPMO value by 134,152 and increase the sigma value by 0.38., Produk jamur kancing kaleng merupakan salah satu produk unggulan dari PT Suryajaya Abadiperkasa. Jika banyak ditemukan defect pada produk akhir, yaitu jika kualitas tidak memenuhi standar perusahaan, maka dapat berakibat produk akan ditolak (reject). Defect produk jamur kancing kaleng di PT Suryajaya Abadiperkasa terdiri dari enam kategori yang meliputi broken, brown spot, stem too long, size, miss forming, openveil. Implementasi metode DMAIC (Define, Measure, Analyze, Improve, Control) dan six sigma berhasil mengevaluasi kualitas produk jamur kancing kaleng di PT Suryajaya Abadiperkasa. Defect broken, size, dan openveil merupakan tiga kerusakan utama yang paling mempengaruhi kualitas produk jamur kancing kaleng karena mencakup 81,50% produksi sebelum dilakukan perbaikan. Nilai defect per million opportunities (DPMO) dan sigma produk jamur kancing kaleng PT Suryajaya Abadiperkasa sebelum perbaikan yaitu 379.459 dan 1,81. Nilai DPMO dan sigma produk jamur kancing kaleng setelah perbaikan yaitu 245.307 dan 2,19. Upaya perbaikan (improvement) dengan melakukan pengawasan dan pengarahan secara rutin kepada pekerja telah terbukti dapat menurunkan nilai DPMO sebesar 134.152 dan meningkatkan nilai sigma sebesar 0,38.
Keyword: Canned champignon, defect, DMAIC, six sigma

Judul: Six Sigma Implementation in Quality Control System at PT. Air Gunung Salak
Abstrak: Permintaan Air minum dalam kemasan setiap tahun semakin meningkat, sehingga persaingan yang terjadi membawa setiap pelaku industri untuk meningkatkan nilai dari produk yang dihasilkan dengan cara melakukan pengendalian kualitas terhadap tingkat kerusakan produk (product defect) sampai pada tingkat kerusakan nol (zero defect). Tujuan penelitian ini adalah untuk mengetahui permasalahan utama dan faktor yang mempengaruhi dalam pengendalian mutu di PT. Air Gunung Salak. Pengolahan data dilakukan dengan perhitungan six sigma didapat Defect per Unit sebesar 0,028996661. Sedangkan Defect per Million Opportunity sebesar 5.799,3, apabila di konversi ke dalam tabel sigma didapat nilai sigma sebesar 4,02. Critical To Quality untuk product reject yaitu Reject air, Kotor Dalam, Reject Galon, Reject Cup dan Reject seal dan permasalahan utama adalah Reject Air dengan rekomendasi rancangan perbaikan yang disarankan dengan memperketat pengawasan pada proses pendistribusian ke pelanggan dengan melakukan pengantaran pada pagi atau malam hari., The demand for bottled drinking water is increasing every year, so that the competition that occurs brings every industry player to increase the value of the products produced by controlling the quality of the level of product defects to zero defects. The purpose of this study was to determine the main problems and factors that influence quality control at PT. Air Gunung Salak. Data processing is done by calculating the six sigma obtained Defect per Unit of 0,028996661. Meanwhile, Defect per Million Opportunity is 5.799,3, when converted into the sigma table, the sigma value is 4,02. Critical To Quality for reject products, namely water rejects, dirty gallon water, gallon rejects, cup rejects and seal rejects and the main problem is water rejects with recommendations for improvement designs by tightening supervision on the distribution process to customers by delivering in the morning or evening.
Keyword: Bottled Drinking Water, Quality Control, reject, Six Sigma

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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