Judul: Optimalisasi Persediaan Bahan Baku Kemas dengan Metode Program Dinamis Algoritma Wagner Within dengan Kendala Kapasitas Gudang di PT Bintang Toedjoe Pulogadung
Abstrak: Persediaan merupakan suatu hal yang berperan sangat penting bagi suatu perusahaan terutama industri manufaktur. Pengendalian persediaan yang baik diperlukan untuk mengelola persediaan agar efektif dan efisien. Penelitian ini dilakukan di PT Bintang Toedjoe Pulogadung dikarenakan permasalahan yang dihadapi yaitu gudang yang penuh (overload) dan persediaan yang berlebihan. Tujuan dari penelitian ini adalah menganalisis kapasitas penyimpanan maksimal gudang dan pengendalian persediaan bahan baku kemas sehingga didapatkan jumlah pemesanan dan persediaan yang optimal dengan adanya kendala keterbatasan kapasitas gudang. Data primer diperoleh melalui observasi di gudang, wawancara dengan bagian terkait dan data sekunder diperoleh dari dokumen perusahaan. Data dianalisis menggunakan Material Requirement Planning dengan metode Program Dinamis Algoritma Wagner Within (AWW). Hasil dari penelitian menunjukan bahwa metode AWW dapat menghemat pengeluaran perusahaan dibandingkan dengan metode perusahaan saat ini. Pengimplementasian metode AWW dapat berpengaruh pada terpenuhinya bahan baku pada saat diperlukan dan tidak menyebabkan overloadnya gudang.
Keyword: algoritma wagner within, material requirement planning

Judul: Optimasi sistem pengendalian persediaan bahan baku di PT Hirema Bogor
Abstrak: Penelitian ini bertujuan untuk menerapkan teknik-teknik penyelesaian optimasi menggunakan metoda Lagrange Multiplier dengan luas gudang sebagai fungsi pembatas, untuk menentukan (1) jumlah optimal bahan yang harus dipesan, (2) tingkat persediaan optimal pada saat pemesanan kembali, dan (3) untuk mendapatkan total biaya pengendalian persediaan yang minimum. Kajian masalah dilakukan di PT Hirema yang memproduksi beberapa jenis makanan ternak. Metode pendekatan berencana digunakan dalam menyusun suatu model optimasi pengendalian persediaan bahan baku. Pengkajian masalah dibatasi terhadap bahan baku utama yang disimpan di gudang bahan baku, yang terdiri dari bungkil kedelai, bungkil wijen, bungkil kelapa sawit, bungkil kacang tanah, dedak halus, "wheat pollard", "rape seed meal", tepung ikan, dan tepung daging. Perhitungan optimasi dilakukan dengan menyusun program komputer dalam bahasa BASIC (INV.BAS). Hasil perhitungan optimasi tanpa pembatas gudang menunjukkan bahwa luas gudang yang diperlukan untuk tempat penyimpanan seluruh bahan lebih besar dari total luas gudang yang tersedia. Oleh sebab itu dalam perhitungan optimasi diperlukan pembatas luas gudang untuk menentukan jumlah optimal masing-masing bahan yang akan dipesan, dan tingkat pemesanan kembali yang optimal.
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Judul: Phylogeography and Species Limits in the Papuan White Snake (Micropechis ikaheka) (Reptilia: Serpentes: Elapidae)
Abstrak: Papua white snake, Micropechis ikaheka, has been distingushed into two subspecies M.i. ikaheka and M.i. fasciatus. However, due to lack of data on their morphology, distribution and ecology, both subspecies often ignored in scintific discussions and refers only byas , Micropechis ikaheka. This study was designed to document the differences between M.i. ikaheka and M.i fasciatus by using scales characteristics and reproductive organ or hemipenes. The study also examine, zoogeography, habitat, diet and cannibalism of both subspecies to better understanding the the ecology of one of the most venomous snakes in the world. This study consists of three topics with method and also different in the size samples, respectively. The first study is the histology and microtopography of the skin were studied using paraffin method and Scanning Electron Microscope (SEM). The second is the hemipenis were examined by following Myers and Cadle (2003), and Zaher and Prudente (2003). The third is the abdominal surgery was carried out to document diet type and the investigate phenomenon of cannibalism in the snake. Specimens for this study came from the collection from Museum Zoologicum Bogoriense (MZB) and Universitas Negeri Papua’s Laboratory (LZU). The research result also indicated that the markers of skin and hemipenis described the same structure and microornamentation in all M. ikaheka groups being compared. Based specimens examined morphological descriptions do not s support the further differentiation in Micropechis. In short, two markers that used in this study could not sufficiently indicate the differences in the level of species and subspecies of M. ikaheka. The study, however, were able to delineate zoogeography and skin color patterns, which fall into four groups: M. i. ikaheka; M. i. fasciatus. M. i. ssp. “intermediate”; and M. i. ssp “black”. This study also revealed that color variations did not overlap in their geographic distribution. It is therefore, it suggested that environmental factors may contribute to the skin color variations. It also assumed that habitat discontinuous and biogeography factors may also cause the loss of the connection between the original populations (vicarians) or follow colonization events (dispersal). The examined of 22 stomach contents of M. ikaheka shows this species is carnivorous, and prey on vertebrates such as amphibians, fish, reptiles, and Mammals. These snakes are opportunistic predators since they prey on all that can be captured, but mainly reptiles (61.5%), followed by mammals and fish (both 15.4%), and amphibians (7.7%). Although categorized as terrestrial animal, the diet study showed that M. ikaheka snakes often go into the water to hunt for fish (the sample from Yapen island), including eel (the sample from Aru island). Based on prey items indentified, there is evidence that M. ikaheka is cannibal. At this time, there still no record on reason for cannibalism, but it is assumed that cannibalism was due to competition between populations and means to control population.
Keyword: geographic variation, white snake, papua