Judul: Strategi Peningkatan Daya Saing Petani Komoditas Kentang Melalui Analisis Beban Kerja
Abstrak: Karo Regency, North Sumatera, has a high, geographical potential through the development of vegetable cultivation. One of the leading commodities in this region is potato. However the achievement of potato target production has been facing instability since seven years ago. Based on the prpblem there are several factors related with human resource management that will be anayzed in the research.
Keyword: compatitiveness, the farmers, workload analysis

Judul: Analisis Beban Kerja Stakeholders Dalam Aktivitas Rantai Pasok Komoditas Kentang Di Berastagi, Sumatera Utara
Abstrak: Kecamatan Berastagi merupakan salah satu daerah penghasil kentang (Solanum tuberosum L) tipe Granola. Tujuan dari penelitian ini adalah : (1) Menganalisis waktu kerja dalam rantai pasok stakeholders pada komoditas kentang berdasarkan analisis beban kerja melalui perhitungan Full Time Equivalent (FTE), (2) Menganalisis peluang efektivitas dan efisiensi aktivitas rantai pasok stakeholders melalui business process mapping berdasarkan kondisi eksisting dalam rangka meningkatkan daya saing petani dari segi harga dan kualitas, (3) Menganalisis distribusi nilai tambah yang didapat oleh masing-masing stakeholders berdasarkan aktifitas yang dilakukan melalui analisis nilai tambah Hayami. Penelitian dilakukan di Desa Gurusinga, Kecamatan Berastagi, Sumatera Utara. Pengumpulan data diperoleh melalui wawancara, observasi, studi literatur beserta internet. Hasil FTE menunjukkan bahwa waktu kerja yang digunakan masih belum optimal dikarenakan metode pertanian yang konvensional. Berdasarkan business process mapping, kondisi eksisting aktivitas rantai pasok kentang di Kecamatan Berastagi masih belum efektif dan efisien dikarenakan penggunaan bibit yang belum terstandarisasi dan kurangnya pemahaman petani tentang pentingnya kontrak bisnis. Dari perhitungan distribusi nilai tambah didapat nilai tambah stakeholders yang tidak sesuai dengan banyaknya aktifitas yang dilakukan. Hal ini dapat diatasi dengan business process reengineering melalui training dan penyuluhan trust building, improvement, budidaya organik dan relationship building.
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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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