Judul: Penentuan Nilai Opsi Real Tipe Amerika Menggunakan Metode Binomial.
Abstrak: Opsi real adalah opsi dengan aset dasar berupa aset nyata, seperti misalnya sebuah proyek pada sektor pertambangan. Opsi real sering digunakan oleh investor untuk menilai suatu proyek yang ingin dijalankan dengan menggunakan pendekatan opsi call dan opsi put pada opsi keuangan. Opsi real dapat menghitung fleksibilitas manajerial atau kemampuan mengubah keputusan investasi yang terjadi selama masa berlangsungnya investasi tersebut. Pada karya ilmiah ini, jenis-jenis opsi real yang dibahas ialah opsi menunda investasi, opsi menutup investasi, opsi memperluas investasi, opsi mengurangi investasi, serta opsi gabungan memperluas dan mengurangi investasi. Nilai hampiran opsi real tipe Amerika ditentukan menggunakan metode binomial, sedangkan nilai “eksak” didapatkan dengan mengambil nilai hampiran dengan banyaknya langkah binomial yang besar. Berdasarkan hasil perhitungan, pergerakan nilai opsi real awalnya berfluktuasi, kemudian seiring bertambahnya langkah binomial nilai hampiran dari nilai opsi real semakin konvergen menuju nilai “eksak”.
Keyword: Opsi real, Investasi, Fleksibilitas Manajerial, Metode Binomial

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: 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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