Judul: Penentuan Standar Waktu Proses Produksi Bedak Dingin Studi Kasus di PT Mustika Ratu Jakarta
Abstrak: Dalam penelitian ini alat yang digunakan untuk mencatat waktu adalah "decimal-minute stop watchtt dan lldecimal-minute electronia timer". Faktor penyesuaian ditentukan berdasarkan sistim Westinghouse dan kelonggaran ditetapkan berdasarkan tabel kelonggaran dari ILO.
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Judul: Time Study of Toolbox Production at PT Rafindo Raya Bogor, Indonesia.
Abstrak: Perkembangan teknologi harus diimbangi dengan perkembangan sistem kerja agar teknologi yang digunakan efektif dan efisien. Oleh karena itu, diperlukan analisa tentang sistem kerja dengan pendekatan ergonomi berupa studi waktu untuk mengevaluasi sistem kerja agar efektif dan efisien. Penelitian ini bertujuan untuk memberikan rekomendasi perbaikan sistem kerja pada bagian produksi toolbox dari analisa elemen kerja dan waktu baku dari setiap proses yang ada dalam kegiatan produksi toolbox. Pengambilan data dilakukan secara langsung menggunakan kamera video. Pengolahan data dilakukan setelah adanya uji kecukupan dan keseragaman data. Pendekatan ergonomika berupa faktor penyesuaian dan kelonggaran bagi pekerja digunakan untuk mendapatkan waktu baku. Hasil penelitian menunjukkan bahwa terdapat 288 elemen kerja dari kegiatan produksi toolbox mulai dari proses cutting hingga packaging dan masih ada perbaikan yang bisa dilakukan oleh perusahaan untuk meningkatkan efektifitas dan efisiensi kerja. Hasil penelitian ini dapat digunakan sebagai acuan bagi lini produksi lainnya di PT Rafindo Raya. Kata kunci: Sistem kerja, studi waktu, produksi toolbox, Development of technology must be balanced with the development of work system that make technology effective and efficient. Therefore, the analysis of work system with an ergonomical approach in the form of time study to evaluate the work system in order to effective and efficient. The objectives of this research is to provide recommendations for improving the work system in toolbox production from the analysis of work elements and standard time of each process in toolbox production. Data were collected directly by using a video camera. Data processing is carried out after testing the adequacy and uniformity of the data. Ergonomical approach be in the form of adjustment factors and allowances for workers is used to obtain the standard time. The results showed that there were 288 work elements of toolbox production starting from cutting process to packaging process and there are still improvements that can be made by the company to increase work effectiveness and efficiency. The results of this study can be used as a reference for other production lines at PT Rafindo Raya. Keywords: Time Study, toolbox production, work system
Keyword: Sistem kerja, Studi waktu, Produksi toolbox

Judul: Pengaruh Infeksi Virus pada Phytoplankton dan Racun yang Dihasilkan Phytoplankton dalam Model Interaksi Phytoplankton-Zooplankton
Abstrak: Interaction of phytoplankton and zooplankton can be considered as a prey-predator interaction, where phytoplankton as prey and zooplankton as predator. This interaction is modeled into mathematical equations that was investigated by Gakkhar & Negi (2005). This model studied the effect of viral infection on phytoplanktons and the toxin produced by phytoplankton. In this model, phytoplanktons are divided into two groups, suspectible phytoplankton and infected phytoplankton. Hopf bifurcation describes the stability changes of population. The Hopf bifurcation occurs when the rate of viral infection and the toxin quantity produced by phytoplakton were changed. Both phytoplankton and zooplankton populations stable when the infection rate and toxin quantity are low. If the viral infection rate and toxin quantity increase then phytoplankton and zooplankton populations became unstable. If the viral infection rate and the toxin quantity relatively high then the zooplankton population would lead to extinction
Keyword: zooplankton, phytoplankton, toxin, viral infection, Hopf bifurcation