Judul: Penerapan CBC-MAC berbasis DES dalam autentik citra
Abstrak: Teknologi yang semakin berkembang menyebabkan citra semakin mudah untuk dimodifikasi. Karena itu sangat sulit unt uk membedakan citra yang asli dan citra yang telah dimodifikasi. Citra yang telah dimodifikasi akan tampak seperti citra asli. Modifikasi citra yang dilakukan menyebabkan citra dengan mudah dipalsukan. Pemalsuan yang dimaksud adalah citra telah dimodifikas i namun secara fisik nampak sama seperti citra asli. Modifikasi yang dilakukan adalah dengan cara mengubah nilai bit -bit pada citra. Oleh karena itu diperlukan suatu metode untuk membedakan citra asli dan citra yang telah dimodifikasi. Autentikasi pada cit ra menggunakan algoritma CBC-MAC berbasis DES. Salah satu proses yang dilalui dalam autentikasi citra adalah penyisipan bit. Metode yang digunakan dalam penyisipan bit adalah metode Least Significant Bit (LSB). Pemeriksaan keaslian citra dilakukan dengan menghitung nilai Mean Square Error (MSE).
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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: Evaluation of Influenza Antibody Titers in Serum and Egg Yolk of Layers Vaccinated with Influenza Vaccines.
Abstrak: Influenza belongs to the Orthomyxoviridae family which causes upper and lower respiratory tract infection. The aim of this study was to evaluate influenza-A specific antibody titers from serum and egg yolk of hens vaccinated with quadrivalent influenza vaccines. Three Hy-line Brown layers were vaccinated with quadrivalent influenza type A and B inactivated vaccines. Vaccination was carried out three times at a dose of 0.25 ml/chicken via the intramuscular route. The first vaccination was carried out at 24 weeks of age, then boosters were performed at 28 and 32 weeks of age. Serum and egg yolk were collected every week for 20 weeks since the first vaccination. Influenza A H3N2 and H1N1 antibody titers were determined using hemagglutination-inhibition (HI) test and agar-gel-precipitation (AGP) test. Influenza-A H3N2 and H1N1 specific antibodies were detected in both serum and egg yolk from the first to twenty weeks after the initial vaccination. Highest HI geometric mean titer (GMT) of H1N1 antibody reached 26.67 HIU at nine weeks post first vaccination (p.f.v), while H3N2 antibody reached 26 HIU at six weeks p.f.v. Our result showed that influenza antibodies can be produced in layers using quadrivalent vaccines and layer chickens are able to produce equivalent antibody levels for each influenza subtype.
Keyword: antibody, egg yolk, influenza, layer chickens, serum