Judul: Teknik Penyisipan Informasi pada Fitur Poligon Peta Vektor Menggunakan Reversible Watermarking
Abstrak: Digital vector maps have high precision. Unfortunatelly, watermarking in digital maps usually cause distortion. This study uses a reversible watermarking technique to overcome this issue. The purpose of this study is to apply a reversible watermarking technique to insert some information into digital maps with the ability to restore the map coordinates prior to insertion. In this study, the file used as the insertion media is a 2D digital map coordinate data in shapefiles and images is used as a the watermark. Reversible watermarking process is done on a vector map with polygon features and each insertion process is only performed on a polygon feature. Features that can be inserted should have larger number of vertices than the number of watermark bits. In this study, the watermark is obtained from the MD5 hash function so that the watermark is fixed at 128 bits. The study shows that information can be inserted to the map and that the coordinates can be restored to the initial coordinates. The quality of the map after the insertion shows a low distortion as reflected by the very small RMSE value.
Keyword: Root Mean Square Error (RMSE), reversible watermarking, digital map, coordinate

Judul: Penerapan teknik watermarking untuk penandaan hak cipta pada peta vektor dengan format DXF
Abstrak: Drawing Interchange Format (DXF) is one of the general file in the field of the vector image commonly used for making maps. The DXF format is a tagged data representation of all the information contained in an AutoCAD drawing (DWG) file. Tagged data means that each data element in the watermark is preceded by an integer number called the group code. The study was carried out because there is still no tools of labeling the copyright on digital mapping using DXF file. This study aims to generate an application for copyright labeling on vector map with DXF format that can be applied to any types of spatial objects in the map. The technique used is changing the code inside the vector image. The insertion of the watermark is done by utilizing ENTITIES section by multiplying objects for sets of binary values. The results showed that the image after the watermarking insertion process is the same as the original vector image. Embedded watermark is resistant to rotation and scaling, however it has the possibility of one-third to be broken in the attack on specific object. This study has successfully implemented watermarking technique for copyright labeling on the vector map with DXF format.
Keyword: Drawing Interchange Format, Robust Watermark, Tagged Data, Vector Image, Watermarking

Judul: Essential Fatty Acid Requirements of Catfish (Clarias batrachus Linn.) for Broodstock Development
Abstrak: This experiment was conducted to determine essential fatty acid requirements of catfish (Clarias batrachus Linn.) for broodstock development. The basic diet supplied to the test fish had protein and fat content 46.51 - 48.29% and 5.8 - 5.96% respectively. The five test diets differed in the essential fatty acid (EFA) level. Diet A contained 0.21% (36-fatty acid and 0.03% S3-fatty acid; diet B 0.67% d6-fatty acid and 2.09%&3-fatty acid; diet C 2.24KU6-fatty acid and 0.07%&3-fatty acid; diet 0 1.85%(;36-fatty acid and 0.56% a3-fatty acid; diet E 0.26% a6 fatty acid and 1.68% d3-fatty acid. Most of US-fatty acid in diet B and D were 1$:3 (33, on the other hand those in diet E were 20:s c33 and 22:6 W3.
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