Judul: Identifikasi DNA pada Barang Bukti Kasus Pembunuhan untuk Keperluan Forensik
Abstrak: Kasus kejahatan terutama pembunuhan kerap terjadi di berbagai negara, termasuk Indonesia. Hal ini membuat ilmu forensik semakin berkembang sebagai bukti ilmiah yang menerapkan ilmu sains dengan melakukan identifikasi DNA. Penelitian ini bertujuan mengidentifikasi DNA pada barang bukti kasus pembunuhan untuk keperluan forensik. Identifikasi DNA menggunakan metode Short Tandem Repeat (STR) atau mikrosatelit dengan 21 marka STR, satu marka penentu jenis kelamin, satu marka Y STR, dan satu marka Y indel. Barang bukti yang di identifikasi diambil dari dua kasus pembunuhan yang berbeda (18098 dan 18101) dengan total tujuh barang bukti dan dua materi biologis tersangka. Konsentrasi DNA terbesar pada sampel buccal swab tersangka 2,78%.Profil DNA yang dihasilkan dari materi biologis pada barang bukti kemudian dicocokkan dengan profil DNA korban dan tersangka. Hasil penelitian ini menunjukkan profil DNA pada barang bukti identik dengan profil DNA korban dan tersangka. Keakuratan kecocokan profil DNA dilihat dari banyaknya kesamaan profil pada 24 marka STR dengan presentase 99,9959696216967% pada kasus 18098 dan 99,99999999999999999% pada kasus 18101. Pada sampel barang bukti kasus 18098 (bercak darah pada botol sabun mandi cair dan mata pisau)dan kasus 18101 (baju korban, tali merah dan tali hitam) ditemukan adanya mixture DNA yang berarti sampel tersebut menghasilkan profil DNA lebih dari satu individu. Terdeteksinya profil DNA bergantung pada cara penyimpanan dan lama penyimpanan barang bukti. Kondisi barang bukti sangat dipengaruhi oleh lingkungan, kontaminasi dan proses pembusukan.
Keyword: barang bukti, pembunuhan, profil DNA, STR

Judul: Comparative Study of DNA Identification on Two Different Sexual Assault Cases
Abstrak: Sexual assault or rape is one of many criminal cases that still occur daily in alarming numbers. Regarding in resolving many of these rape cases, forensic DNA testing has a major role in exonerating or convicting an individual deemed as suspect. Current DNA testing provides the DNA profile of evidence and reference through STR markers-based and lineage markers of Y chromosome and mitochondrial DNA approach. STR can distinguish an individual from another individual. There are two sets of STR markers complying with the standards requested by criminal databases around the world. These STR markers are mainly incorporated into commercial kits such as GlobalFiler™ Kit. This study aims to compare the processes and results of forensic DNA identification on two different rape cases. All samples were examined and extracted by chelex extraction method. The DNA extracted from these samples was quantified then amplified in 24 markers with GlobalFiler™ Kit and followed by capillary electrophoresis. Lastly, the DNA profile was compared and matched. Different samples from both cases yield a different amount of DNA concentrations with a very low level of male DNA concentrations in the vaginal swab. Therefore, it failed to produce any DNA profile. Full DNA profile on 24 markers of some samples was successfully obtained and compared, with one sample obtained a partial DNA profile. Two samples of each case are found to be biologically related because of the similarity in half of their DNA profile. One of the cases regarded as inconclusive because of the absence of the perpetrator’s DNA profile in the evidence. Thus, making it impossible to compare.
Keyword: DNA profile, DNA testing, GlobalFiler™ Kit, Sexual assault, Sexual assault, STR markers

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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