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"ABSTRAKKeterbatasan lisensi penggunaan citra satelit penginderaan jauh resolusi tinggi seperti SPOT-6, SPOT-7, dan Pleiades-1A dari Bank Data Penginderaan Jauh Nasional (BDPJN) Lembaga Penerbangan dan Antariksa Nasional (LAPAN) kepada pengguna menuntut teknik keamanan data saat didistribusikan melalui media elektronik sehingga tidak digunakan secara ilegal oleh pihak yang tidak berwenang. Enkripsi dan reversible data hiding merupakan dua perlindungan privasi yang efektif dan populer yang dapat dipilih sebagai solusi komunikasi rahasia. Pada penelitian joint reversible data hiding in encrypted image (RDHEI) sebelumnya, performansi extracted-bit error rate (EER) dan peak signal-to-noise ratio (PSNR) citra yang dipulihkan kurang memuaskan seiring mengecilnya ukuran blok. Oleh karena itu, penelitian ini mengusulkan peningkatan akurasi performansi sistem joint reversible data hiding untuk citra satelit penginderaan jauh dari sistem referensi yang ada dengan memodifikasi fungsi fluktuasi dalam proses ekstraksi data dan menggunakan teknik embedding Reed-Solomon (RS) codes. Secara keseluruhan, berdasarkan hasil eksperimen, baik usulan sistem dengan modifikasi fluktuasi tanpa RS codes maupun usulan sistem dengan modifikasi fluktuasi dan RS codes berhasil memperkecil EER, memperkecil ukuran blok dalam memperoleh error-free extracted-bit, dan meningkatkan PSNR dibandingkan dengan metode referensi RDHEI yang ada untuk implementasi pada citra uji satelit SPOT-6, SPOT-7, dan Pleiades-1A.

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ABSTRACTLimitations on licensing the use of high resolution remote sensing satellite images such as SPOT-6, SPOT-7, and Pleiades-1A from the National Remote Sensing Data Bank (BDPJN) of the National Institute of Aeronautics and Space (LAPAN) to users need data security techniques when distributed through electronic media so that not used illegally by unauthorized parties. Encryption and reversible data hiding are two effective and popular privacy protections that can be chosen as confidential communication solutions. In previous research on joint reversible data hiding in encrypted image (RDHEI), the performance of extracted-bit error rate (EER) and peak signal-to-noise ratio (PSNR) of the recovered image was less satisfactory as the block size decreased. Therefore, this work proposes performance accuracy improvement of the joint reversible data hiding system for remote sensing satellite images from existing reference systems by modifying the fluctuation function in the data extraction process and using the Reed-Solomon (RS) codes embedding technique. Overall, based on experimental results, both the proposed system with fluctuation modification without RS codes and the proposed system with fluctuation modification and RS codes succeeded in reducing the EER, reducing the block size in obtaining error-free extracted-bits, and increasing PSNR compared to the existing RDHEI reference methods for implementation in SPOT-6, SPOT-7, and Pleiades-1A satellite test images."

"A 2014 report from Digital Marketing Philippines stated that the number of web applications with visual content as their main product has increased significantly. Image processing technology has also undergone significant growth. One example of this is optical character recognition (OCR), which can convert the text on an image to plain text. However, a problem occurs when the image has low contrast and low exposure, which potentially results in information being hidden in the image. To address this problem, histogram equalization is used to enhance the image’s contrast so the hidden information can be shown. Similar to X-ray scanning used in the medical field, histogram equalization processes scanned images that have low brightness and low contrast. In this study, histogram equalization was successfully implemented using OCR preprocessing. The test was done with a dataset that contains dark background images with low light text; the successful outcome resulted in the ability to show 74.95% of the information hidden in the image."

"Skripsi ini mengkaji variasi dan dinamika pengalihan serta penyembunyian pengetahuan oleh petani Asosiaasi Pengukur Curah Hujan (APCH). Pengetahuan yang diintroduksi oleh Warung Ilmiah Lapangan (WIL) merupakan pembelajaran tentang agrometeorologi, merupakan materi baru yang diterima petani APCH Sumedang. Pembelajaran itu mendorong petani melakukan pengukuran curah hujan serta pengamatan agroekosistem agar dapat mengantisipasi ketidakpastian di masa mendatang terkait fenomena perubahan iklim. Melalui Tim WIL UI dan ilmuwan, pembelajaran itu disebarluaskan kepada petani agar mereka dapat melakukan pengayaan pengetahuan dan mengambil keputusan di lahan mereka masing-masing. Namun, tidak semua petani APCH menyebarluaskan pengetahuan baru itu kepada petani lain di luar petani APCH, sehingga menghasilkan tiga varian mekanisme pengalihan pengetahuan, dan tiga varian mekanisme penyembunyian pengetahuan. Dari fenomena itu, terdapat perubahan perilaku individu yang sebelumnya menyembunyikan menjadi mengalihkan pengetahuan. Skripsi ini menggunakan framework agency atau keagensian individu untuk melihat bagaimana variasi mekanisme dalam fenomena pengalihan dan penyembunyian pengetahuan tersebut dapat terwujud.

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This thesis examines the variation and dynamics of sharing and hiding knowledge by farmers of the Sumedang Asosiasi Pengukur Curah Hujan (APCH). The knowledge introduced by the Science Field Shop (SFS) is a lesson about agrometeorology which is a new material received by APCH Sumedang farmers. This learning encourages farmers to measure rainfall and observe agroecosystem in order to anticipate future uncertainties related to the phenomenon of climate change. Through the WIL UI Team and scientists, these lessons are disseminated to farmers so that they can enrich their knowledge, and make decisions on their respective fields. However, not all APCH farmers disseminated the new knowledge to non-APCH farmers, resulting in three variations of shared knowledge mechanisms and three variations of unshared knowledge mechanisms. From these phenomena, it also appears that there is a change in individual behavior from sharing to hiding knowledge. This thesis uses the agency framework to see how the variety of mechanisms in the phenomena of sharing and hiding knowledge can be realized."

"Berdasarkan data BPS tahun 2019, provinsi Jawa Barat, DKI Jakarta, Bali, Jawa Timur dan Jawa Tengah merupakan daerah yang paling banyak menerima tamu, baik tamu asing maupun domestik pada hotel bintang dengan akumulasi 59,44% dan Tingkat Penghunian Kamar hotel bintang di seluruh Indonesia mencapai 54,99%. Banyaknya rata- rata kunjungan tamu pada provinsi tersebut dan juga tingginya tingkat penghunian kamar di hotel bintang empat dan lima menunjukkan perlu adanya pemberian pelayanan yang berkualitas dari karyawan frontline hotel kategori tersebut terhadap para tamu yang bisa dicapai melalui berbagi pengetahuan pengalaman unik yang mereka alami dengan sesama anggota organisasi. Dimana salah satu strategi utama organisasi dalam membangun knowledge sharing yang efektif dalam organisasi adalah merancang strategi untuk mencegah anggota organisasi terlibat dalam perilaku menyembunyikan pengetahuan yang mereka miliki atau disebut dengan istilah knowledge hiding. Penelitian ini bertujuan untuk menguji kembali pengaruh Altruistic leadership terhadap perilaku knowledge hiding dengan mediasi LMX, leader triggered postive emotion, relational social capital pada karyawan frontline hotel bintang empat dan lima. Penelitian ini menitik beratkan pada perilaku knowledge hiding, yang masih jarang diteliti di Indonesia. Pengumpulan data dilakukan dengan metode survei, didapatkan responden sejumlah 192 karyawan frontline yang tersebar di lima provisnis di Indonesia yaitu, Jakarta, Jawa Barat, Jawa Tengah, Jawa Timur dan Bali. Pengolahan data menggunakan metode Structural Equation Modeling (SEM) menunjukkan hasil bahwa Leader-triggered positive emotion dan Relational social capital memediasi secara penuh pengaruh altruistic leadership terhadap perilaku knowledge hiding. Sementara Leader–member exchange tidak memediasi pengaruh altruistic leadership terhadap perilaku knowledge hiding.

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Based on data from BPS in 2019, West Java, DKI Jakarta, Bali, East Java and Central Java were the areas that received the most guests, both foreign and domestic guests at star hotels, with an accumulation of 59.44% and The Room Occupancy Rate for star hotels throughout Indonesia reached 54.99%. The number of average guest visits in these provinces and also the high rate of room occupancy in four and five star hotels indicate the need to provide quality service from frontline hotel employees of that category which can be achieved through sharing knowledge of the unique experiences they have experienced with others organization member. Where one of the main strategies of organizations in building effective knowledge sharing in organizations is to design strategies to prevent organizational members from engaging in hiding knowledge they have or what is known as knowledge hiding. This study aims to re-examine the effect of altruistic leadership on knowledge hiding behavior with mediation of LMX , leader triggered postive emotion, relational social capital on frontline employees of four and five star hotels. This research focuses on knowledge hiding behavior, which is still rarely studied in Indonesia. The data was collected using a survey method. The respondents were 192 frontline employees spread across five provinces in Indonesia (Jakarta, West Java, Central Java, East Java and Bali). Data processing using the structural equation modeling (SEM) method shows that leader-triggered positive emotion and relational social capital fully mediate the influence of altruistic leadership on knowledge hiding behavior. Meanwhile, leader–member exchange does not mediate the influence of altruistic leadership on knowledge hiding behavior."

"This book introduces medical imaging, its security requirements, and various security mechanisms using data hiding approaches. The book in particular provides medical data hiding techniques using various advanced image transforms and encryption methods. The book focuses on two types of data hiding techniques: steganography and watermarking for medical images. The authors show how these techniques are used for security and integrity verification of medical images and designed for various types of medical images such as grayscale image and color image. The implementation of techniques are done using discrete cosine transform (DCT), discrete wavelet transform (DWT), singular value decomposition (SVD), redundant DWT (RDWT), fast discrete curvelet transform (FDCuT), finite ridgelet transform (FRT) and non-subsampled contourlet transform (NSCT). The results of these techniques are also demonstrated after description of each technique. Finally, some future research directions are provided for security of medical images in telemedicine application."