Judul: Penerapan dan Analisis Metode Discrete Cosine Transform (DCT) dengan Huffman Code pada Steganografi Video AVI
Abstrak: The use of digital data is increasingly encountered and began to replace analog media's role in various applications. Digital data has several advantages such as being easy in storage, duplication, processing, and distribution. Digital communication on the one hand strongly support the ease of message exchange transactions, but on the other hand has a higher risk of security, especially for confidential messages. Steganographic methods are used to hide secret messages in digital form into other digital media. This research proposed the implementation of steganography in AVI video using the Discrete Cosine Transform (DCT) technique. DCT is a method that will transform data from the spatial domain into the frequency domain and separates the data into two parts, namely the DC coefficient and AC coefficients. DCT-based steganography embed the text message in Least Significant Bits (LSB) of the DC coefficient. The test consists of subjective video quality analysis based on survey and objective testing using the Mean Structure Similarity (MSSIM), analysis of the data hiding validity, and the level of data hiding capacity. Huffman compression on the text is used to increase the capacity of the storage. In addition, using more bits of DC coefficients will further increase the capacity. The test result shows that the steganographic technique using DCT produces data hiding with level the of validity reaches 100%. In addition, the quality of the resulting video is still relatively good up to 4-LSB for message insertion. Also, it is known that the Huffman compression on the text message can reduce the processing time and increase the capacity of the insertion.
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Judul: Steganografi Video Dengan Menggunakan Metode Discrete Cosine Transform (DCT)
Abstrak: Information security nowadays has become a very important thing to note. A lot of confidential information such as personal data, financial data, and even state secrets confidential data needs to be protected so it cannot be misused by other people who are not authorized to do so. There are various methods to protect certain information, such as with cryptography and steganography. Cryptography change the original message into a meaningless message. This is important because with meaningless message, an unauthorized person can not know the contents of the message. But with the message is not meaningful, people would suspect that there is a hidden secret information inside the message and will try to break it. Therefore, this suspicion must be avoided and a suitable method to avoid suspicion is steganography which disguise a message so that its presence is not recognized by the other people. This research is about steganography applied in video using DCT method. Basically this method is modifying the DC coefficient bits in each byte of cover file. Text messages was inserted into video of .avi type format and then the message was retrieved from the video file. From the test results, it can be proved that the DCT method can be implemented in a video steganography. This method can qualify most criteria of steganography such as imperceptible, fidelity and recovery but not yet qualify the criteria of robustness. Nevertheless, there is still plenty of space that can be used in conducting the development of video steganography using DCT.
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Judul: Definisi zat besi ( Fe ) pada anak babi
Abstrak: Dalam bidang sub sektor peternakan, ternak babi mempunyai prospek yang cukup baik untuk dikembangkan dalam rangka meningkatkan eksport non migas. Namun anak-anak babi yang sedang menyusu sering mengalami defisiensi zat besi (Fe). Bila masalah ini tidak segera ditanggulangi, peternak akan mengalami kerugian. Zat besi dapat diperoleh dari makanan yang berasal dari hewan (tepung tulang, tepung ikan, tepung daging, "skimmed milk"); tumbuh-tumbuhan (leguminosae, rumput-rumputan, biji-bijian) dan mineral alam (Girindra, 1979). Dalam tubuh hewan, zat besi berperanan sebagai pembawa 02 ke seluruh jaringan, juga sebagai pembawa oksigen pernafasan di dalam sel urat daging (Underwood, 1981). Dalam duodenum dan yeyenum bagian atas, besi dalam bentuk ferro akan diserap. Penyerapan ini akan diatur berdasarkan teori "mucosal block" dari Granick. Kemudian dalam plasma darah, besi akan berikatan dengan B₁ globulin dan membentuk transferrin, yang akan segera dibawa ke seluruh jaringan. Kelebihan besi akan diikat oleh apoferritin dan membentuk ferritin yang ditimbun sebagai besi cadangan, terutama di hati. Bila kapasitas besi yang dapat disimpan sebagai ferritin telah jenuh, maka besi akan ditimbun sebagai hemosiderin. Zat besi dalam jumlah yang sedikit akan diekskresikan melalui pengelupas- an epitil, tinja, air kemih, cairan empedu, keringat. ...
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