Judul: The influence of international soybean price shock on domestic soybean price
Abstrak: Foods are primary human basic need. Lack of food supply could implicate on social and politic instability. The fluctuation of foods prices influence risk and uncertainty on decision making process. Soybean is primary commodity in Indonesia after rice and corn. The growth of soybean production is lower than its demand so it leads to increasing number of import. High number of imported soybean may indicate a correlation between international and domestic soybean price. The objectives of this study are (1) to analyze the short term correlation between international soybean price and domestic soybean price, (2) to analyze the long term correlation between international soybean price and domestic soybean price, and (3) to determine the impact of international soybean price shock on domestic soybean price. This study used data from Ministry of Trade, Bank of Indonesia (BI), United States Departement of Agriculture (USDA) and Zhengzhou Commodity Exchange (CZCE). International soybean price represented by USA soybean price (world largest exporter) and China soybean price (world largest importer). Those data above were secondary data in monthly time series form collected from 2009 until 2012. The method use in this study is Vector Correction Error Model (IRF, FEVD and pass trough). This study use Eviews 6.0 software. Study show that in the short term, international soybean price (USA and China) influence’s to domestic soybean price were not significant. In long term the USA soybean price has positive significant influence to domestic soybean prices. In contrast, the real exchange rate has negative significant influence. Pass trough analysis conclude that the impact of international soybean price (USA soybean price) shock on domestic soybean price was 1.6 percent.
Keyword: VECM, international soybean price, domestic soybean price

Judul: Dampak guncangan harga minyak mentah dunia terhadap harga beras domestik (suatu analisis kointegrasi)
Abstrak: Rice is a substantial strategic and food comodity in Indonesia and also in some countries in the world, particularly in Asia. Therefore, the stability of rice price and the availability should be maintained, especially rice is also known as unstable commodity. Starting in 1994, Indonesia became a net importer of rice commodity, then, Indonesia‟s rice market is allegedly integrated with the world‟s rice market. Consequently, any changes or shock in the world‟s rice market, which is one of its shocks caused by world oil price shock, will affect the domestic rice market. The objectives of this study are: (1) to analyze factors that influence the domestic rice price, (2) to analyze the effect of changes on the world oil price shocks to the domestic rice price. The applicable method for this study is vector error correction model (VECM) with analysis tools are IRF, FEVD, and pass-through. The estimation results indicate that there is a cointegration in the models studied. In the short-term, factors (variables) that affect the domestic rice price are the price of imported rice, domestic rice price, and the price of crude oil. Besides, in the long run, factors (variables) that affect the domestic rice price are the price of imported rice, world rice price, and production rice. The variables that largely influence the domestic rice price are world rice price and price of imported rice. On the other hand, a variable that slightly affect is the total factor productivity (TFP).
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Judul: Closed Knight’s Tour pada Papan Catur Berbentuk Persegi Panjang dengan Ukuran Maksimal 8 × 8
Abstrak: Closed Knight’s Tour merupakan langkah kuda yang mengunjungi setiap kotak pada papan catur tepat satu kali dengan langkah kuda berawal dan berakhir pada kotak yang sama. Graf yang terbentuk dari closed knight’s tour dinotasikan sebagai graf G(m,n), dengan m adalah banyaknya baris dan n adalah banyaknya kolom. Graf tersebut memuat Hamiltonian cycle. Sebuah graf terhubung G adalah graf bipartite jika dan hanya jika graf tersebut tidak memiliki cycle dengan panjang ganjil. Papan catur yang memenuhi syarat cukup untuk memiliki closed knight’s tour adalah papan catur berukuran 5 × 6, 5 × 8, 6 × 6, 6 × 7, 6 × 8, 7 × 8, dan 8 × 8.
Keyword: bipartite, closed knight’s tour, hamiltonian cycle, knight’s tour, teori graf