Judul: Perbandingan Teknik Watermark CDMA dalam Domain Spasial dan Domain Wavelet pada Citra Digital
Abstrak: Presentation of data and information has been progressing quite rapidly, so data and information has been widely presented in digital format. Problems began to emerge as widespread digital data need to be protected. This is related to ownership, copyright, or authenticity issues. This study tries to provide solutions to these problems by applying the digital watermarking with Code Division Multiple Access (CDMA) technique. This technique uses a digital image composed of a cover image and two types of watermark (initial and copyright). There are two stages in this research, the first is trying to insert two types of watermark on the cover image in two different domains, namely spatial domain and wavelet domain. Once inserted, the watermark is extracted back to be compared with the original watermark. The second is attempting to insert an initial watermark on the cover image in two different domains, then giving some distortion of the image to be tested for resistance. After that, the watermark is extracted again. From the experiment results, it is known that wavelet domain CDMA is superior in terms of quality of the extracted watermark, processing time, and resistance to distortion (JPEG compression and gamma correction). While CDMA coding spatial domain is simpler and has a resistance to gamma correction only.
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Judul: Perbandingan teknik watermarking berbasis SVD, DCT-SVD, dan SVD-DCT pada video digital
Abstrak: With the advantages of digital video processing, digital video can be manipulated and distributed illegally by irresponsible parties. Such actions are detrimental to owners of digital video and violate the copyright of the digital video. One solution to overcome this problem is to apply the watermarking technique in digital video. Watermarking techniques can be performed in spatial domain, frequency domain and hybrid domain. In the spatial domain, one of the watermarking techniques can be performed using Singular Value Decomposition (SVD) as proposed by Liu-Tan. In the frequency domain, one of the watermarking techniques can be performed using Discrete Cosine Transform (DCT). In the hybrid domain, one of the watermarking technique can be done by combining SVD with DCT. In this paper, the author tries to apply the watermarking technique proposed by Liu-Tan on digital video in spatial domain and hybrid domain. There are two methods in the domain of hybrid that will be proposed, namely the transformation of DCT-SVD and SVD-DCT transformation. Three watermarking technique compared based on the PSNR value of the insertion, insertion time, the correlation value from extraction, extraction time, and the robustness. Attacks carried out in this study is the attack noise, filtering attack, attack rotations, and cropping attacks. The results showed that the watermarking technique proposed by Liu-Tan is applied to the hybrid domain would increase the value of PSNR and correlation values, but vulnerable to some attacks. In the hybrid domain, the transformation of SVD-DCT is better than DCT-SVD transformation.
Keyword: Watermarking, Digital video, SVD Transform, DCT Transform, Bogor Agricultural University, Institut Pertanian Bogor, IPB

Judul: Karakteristik Anatomi Skelet Kepala Buaya senyulong (Tomistoma schlegelii).
Abstrak: Buaya sepit atau senyulong (Tomistoma schlegelii) merupakan jenis buaya asli Indonesia yang berhabitat di sungai-sungai Sumatera, Kalimantan, dan juga pedalaman Sulawesi. Salah satu ciri khas buaya senyulong adalah bentuk moncong yang runcing dan sempit, namun hingga saat ini informasi mengenai struktur skelet kepala buaya senyulong sangat terbatas. Penelitian ini bertujuan untuk mempelajari karakteristik anatomi skelet kepala buaya senyulong yang dikatikan dengan fungsi dan perilakunya. Penelitian dilakukan secara eksploratif dengan melakukan pengamatan, pencatatan, dan pengambilan gambar dari skelet kepala buaya senyulong. Skelet kepala berukuran panjang 70 cm, lebar 29 cm, dan tingggi 17 cm dengan permukaan kasar pada os nasale, os frontale, os maxilla, os mandibula, os lacrimale, os jugale. Jumlah gigi pada buaya ini sebanyak 78 buah, terdiri dari 4 buah gigi premaxila, 16 buah gigi maxila, dan 19 buah gigi mandibula. Pada regio orbitalis ditemukan dua pasang fenestrae temporales yang berkembang baik. Fenestra supratemporale merupakan lubang oval yang membentang di sepanjang os parietale. Fenestra infratemporale berbentuk segitiga dan dibatasi oleh os squamosum, os postorbitale, os jugulare, dan os quadratum. Os mandibula hewan ini mempunyai symphysis mandibularis yang panjang yaitu garis yang melintang di corpus mandibulae. Secara fungsional ukuran symphysis mandibularis berkaitan dengan adaptasi hewan terhadap diet makan.
Keyword: kepala, moncong, Tomistoma schlegelii