Judul: Anthropometry of female farmer and its aplication in sickle handle design
Abstrak: Empirical data base of anthropometric of Indonesian farmer is very limited presently; though farmer is the main employment which covers about 45% of Indonesian labour force. This research was conducting in aim to develop anthropometric data base of farmer especially for female farmer at District of Dramaga, West Java. The anthropometric data base is important for designing tools, machine, and other equipment in order to be used in more affective, safely, and comfortable manner. Based on the anthropometric data, design of a sickle handle was then studied. This research was conducted in June to October 2010, located at District Dramaga, Bogor. The subjects are female farmers, 20-45 years old, citizen of District Dramaga, Bogor. The number of subjects was estimated according to ISO 15535:2003. General requirements for establishing anthropometric data bases for a 95% confidence interval, and for the 5th, 50th, and 95th percentiles. According to the calculation of sample size, 60 subjects was measured and 41 anthropometric parameters, for each subject were collected then the mean, standard of deviation, 5th percentile, 50th percentile, 95th percentile, and coefficient of correlation for each parameters was analyzed. The result of motion analysis shows that there are 10 anthropometric parameters directly related to the sickle handle design; that are waist heigh with a value 80.20 cm (5th percentile) and 92.50 cm (95th percentile), a shoulder height of 117.50 cm (5th percentile) and 130.40 cm (95th percentile), body height 149 cm (5th percentile) and 156.90 (95th percentile), arm length 57.20 cm (5th percentile) and 64.80 cm (percentile -95), upper arm length 27.20 cm (5th percentile) and 34.70 cm (95th percentile), length of palm 9.60 cm (5th percentile) and 13:40 cm (95th percentile), shoulder width 41.40 cm (5th percentile) and 49.20 cm (95th percentile), the width of the palm of the hand (four fingers) 8:20 cm (5th percentile) and 8.80 cm (95th percentile), 9:30 cm diameter hand grip (percentile 5) and 9.60 cm (95th percentile), and hand grip circumference 13.74 cm (5th percentile) and 15:07 cm (95th percentile). Based on the anthropometric data, the optimal design analysis has been carried out the recommended sickle handle suitable for use in the research area is the long handle of the sickle is 30.71 cm (95th percentile), the diameter of the grip handle of the sickle is 3:38 cm (percentile 5) to the end nearest the handle of eye crescent, 3:49 cm (percentile 50) to handle the sickle the middle, and 3.60 cm (95th percentile) for the sickle handle furthest from the eye crescent.
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Judul: Studi Antropometri dan Implementasinya dalam Desain Konseptual Tata Letak Ruang Kendali Combine Harvester untuk Petani Indonesia.
Abstrak: Antropometri merupakan salah satu aplikasi ilmu ergonomi, data antropometri dapat digunakan sebagai dasar untuk desain suatau alat atau mesin, yang dapat dijadikan sebagai salah satu upaya untuk meningkatkan efisiensi, keamanan dan kenyamanan kerja. Dalam penelitian ini dilakukan pengumpulan data antropometri laki-laki dan perempuan di Indonesia dari enam daerah yang berbeda yaitu Sumatera, Sulawesi, Kalimantan, Jawa, Nusa Tenggara Barat, dan Nusa Tenggara Timur. Total sampel yang diukur adalah 373 laki-laki dan 363 perempuan. Tinggi badan laki-laki persentil ke-5, ke-50, ke-95 adalah 154.8, 161.7, 170.5 cm, sedangkan untuk perempuan adalah 145.2, 152.6, 160.6 cm. Berdasarkan perbedaan wilayah postur tubuh petani sumatera lebih tinggi dibandingkan postur tubuh petani NTT, artinya semakin mengarah ke Indonesia bagian timur selatan postur tubuh semakin kecil, dan secara umum postur tubuh petani perempuan persentil 50 memiliki postur tubuh yang hampir sama dengan laki-laki persentil ke-5 dan perempuan persentil 95 memiliki postur tubuh hampir sama dengan laki-laki persentil ke-50. Untuk ukuran terkecil adalah perempuan persentil ke-5 dan ukuran terbesar adalah laki-laki persentil ke-95, sehinggga diperoleh empat kelompok ukutan tubuh yang berbeda. Data antropometri digunakan sebagai dasar dalam mendesain ruang kendali combine harvester, dimana tahap pertama diperoleh empat desain yang berbeda yang telah disesuaikan dengan empat kelompok ukuran operator yang berbeda, kemudian dilakukan analisis RULA pada setiap kombinasi desain dan operator yang berbeda. Diperoleh hasil bahwa desain 4 dapat diterima oleh operator laki-laki persentil 50, dan laki-laki persentil 95 dengan skor akhir 2-4. Namun perlu dilakuakan investigasi perbaikan untuk operator perempuan persentil 5, laki-laki persentil 5 karena memiliki skor akhir 5-7. Kemudian tahap dua dilakukan optimasi pada desain 4 untuk memperoleh desain yang dapat diterima oleh keempat operator yang berbeda dimana rekomendasi desain yang diberikan adalah dengan mendesain kursi yang bersifat adjustable yang dapat diatur ketinggian tempat duduk dan jarak bangku terhadap panel kemudi di bagian depan (dashboard) dengan tinggi maksimal 650 mm dan ketinggian minimal 450 mm, sedangkan jarak bangku maksimal untuk maju dan mudur adalah 100 mm, hingga diperoleh hasil simulasi analisis RULA dengan skor akhir 2-4, artinya kondisi tersebut dapat diterima dalam kondisi berulang dan waktu yang lama.
Keyword: antropometri, petani Indonesian, ruang kendali combine harvester, RULA

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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