Judul: Penentuan Nilai Opsi Tipe Eropa dan Amerika Menggunakan Metode Binomial
Abstrak: Investors have purposes to obtain maximum returns, but they must be careful to invest their money because they may take risk. Therefore, they need products to reduce the risk. The products are called derivative products. There are many kinds of derivative products, such as options. An option is a type of contract between two parties. One party gives the other party a right to sell or to buy some assets in a certain price and in a certain period. Based on their execution time, there are two types of options i.e. European styles and American styles. European style options can only be exercised at expiration time, meanwhile American style options can be exercised at random time to the expiration time. In this paper, the option price at a discrete time will be determined by using binomial model. A binomial model is a model that describes asset price movements by assuming two possibilities of asset price movements in the future. Those are up and down. One-step binomial structures can be expanded into multistep binomial structures in order to approximate the option price. The application of one-step binomial model is used on the European option and multi-step binomial model is used on the American option. The acquired formula is applied to calculate the value of call option of PT Telekomunikasi Indonesia stocks in January 2012 based on the data of January to December 2011’s fluctuation of stock.
Keyword: American Style., European Style, Options, Binomial Model

Judul: Penentun nilai opsi Asia menggunakan metode binomial: studi kasus PT Astra Internasional Tbk
Abstrak: Opsi Asia tipe Eropa adalah salah satu opsi yang dapat dieksekusi pada waktu jatuh tempo, namun harganya bergantung pada rata-rata harga aset selama opsi tersebut berlaku. Karya ilmiah ini membahas penentuan harga opsi Asia secara numerik. Lebih khusus, pendekatan numerik yang digunakan dalam karya ilmiah ini ialah model binomial. Model binomial merupakan model sederhana yang digunakan untuk mengaproksimasi harga saham di masa mendatang, dengan mengasumsikan dua kemungkinan pergerakan harga saham yaitu harga saham akan naik (u) atau turun (d). Model binomial one-step dapat diperluas menjadi model binomial multi-step dan dapat diterapkan pada model penentuan harga opsi dari saham PT Astra Internasional Tbk…
Keyword: Binomial model, Multi-step binomial model, One-step binomial model, Asian option with Europe type, Teori peluang, Model binomial, Aset, Saham, Valatilitas

Judul: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
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