Judul: Peningkatan fasilitas dan keamanan sistem peminjaman koleksi
Abstrak: Digital library is a library that keeps the collection in a form of digital file and passes it through a computer network. Collection lending system is a part of digital library which is useful in the process of borrowing digital library collection. Collection lending system has multimedia file collection, but it does not have multimedia file reader. Collection lending system also has unguaranteed security system. Therefore, there is a need of improvement in this system. The improvement of this system is done by adding a multimedia file reader facility and security enhancements. Security is enhanced by the security services improvements. There is two ways to improve the security services. The first is the improvements of confidentiality and authentication service. The second improvement is the addition of integrity service. Confidentiality service improvement is made by adding a new input to the header, implementation of the password hash function, and adds a read-only and hidden attribute to the temporary file that generated during the decryption process. New input in a form of hours is added to the header to handle date manipulation. Entity authentication service is enhanced with the implementation of captcha. Captcha is implemented to ensure that the entity that borrowed the file is not a computer program. Integrity service addition is made by the implementation of hash function to the file. Integrity service is added to ensure that the file that has been borrowed has not been modified by the entity that is not responsible.
Keyword: Security service, Duplikasi file, File audio, Collection lending system, Bogor Agricultural University, Institut Pertanian Bogor, IPB

Judul: Sistem peminjaman koleksi digital perpustakaan
Abstrak: Perpustakaan merupakan salah satu sarana untuk mendapatkan informasi yang dapat diakses oleh masyarakat umum. Salah satu bentuk koleksi yang mulai banyak dimiliki perpustakaan adalah file digital (koleksi digital). File digital memiliki sifat dan karakteristik yang berbeda, sehingga dibutuhkan mekanisme peminjaman yang berbeda. Penelitian ini dilakukan untuk membuat sistem yang dapat melindungi file digital koleksi perpustakaan dengan menggunakan kriptografi dan menambahkan informasi ke dalam file tersebut. Sistem yang dikembangkan adalah DigiLib Server dan DigiLib Client. DigiLib Server merupakan perangkat lunak yang dapat melakukan proses enkripsi terhadap file koleksi perpustakaan sekaligus menambahkan informasi ke dalam file koleksi tersebut. DigiLib Client merupakan perangkat lunak yang dapat melakukan proses dekripsi terhadap file koleksi yang telah terenkripsi oleh perangkat lunak DigiLib Server dan membaca informasi tentang aturan penggunaan file.
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Judul: Thermal Characteristics and Dynamics of Tropical Cyclone over Western North Pacific Ocean: A Case Study of Typhoon Songda (Chedeng) 2011
Abstrak: The frequent occasion of Tropical Cyclone (TC) over Western North Pacific (WNP) Ocean lies from 10˚N to 26˚N and 121˚E to 170˚E. Sources of TC development come from warm ocean temperature where latent heat is released during condensation processes and subsequently concentrated in the boundary layer. Relative humidity at 850-700 hPa is responsible to produce the most intense storm. Meanwhile, weak vertical wind shear between 850-200 hPa is one of the dynamical factors that lead to the development of TC. Pressure level of 850-200 hPa is chosen to minimize the thermodynamic effect in the lower troposphere. Typhoon Songda (Chedeng in the Philippines) or TSC lasted from May 18th to 30th, 2011 and strengthened into powerful Super Typhoon stage between May 24th and 27th. Long curving track and the exhibition of all sequences of TC life cycle, TSC is then considered as an ideal case of TC. The objective of the study with case of TSC is to investigate the role of thermal characteristics and dynamics on TC intensity. The research is carried out by using Advanced Research of Weather Research and Forecasting model (WRF ARW model) version 3.3. Two domains are employed in the model. The first domain situate from 02˚N to 40˚N and 118˚E to 149˚E and cover spatial resolution () of 33.1 km. The second domain situate from 09˚N to 27˚N and 119˚E to 132˚E with of 11 km. Timestep of the model () is 120 seconds. The model is supported by the following physical parameterization, i.e., Yonsei University Scheme (YSU) in the boundary layer, Kain-Fritsch scheme (KF) in the cumulus, and WRF Single-Moment 3-class scheme in the microphysics. Initial meteorological condition prior to the formation of the cyclone is generated using WRF ARW standard-release model. Sensitivity of the model output is obtained from a selected single-parameter change scenarios, namely, 10 % to 20 % decrease and increase of wind shear initial data at 850-200 hPa, and by 10 % to 20 % decrease of relative humidity initial data at 850-700 hPa. The result showed that the negative correlations between wind shear and intensity are found in wind shear scenarios. Wind shears of 10 ms-1 which lead to strengthening of the wind intensity in the early period of Typhoon development are found in wind shear scenarios. The effect of wind shear changes on wind intensity is statistically significant in the 20 % wind shear scenarios. During mature stage, weak wind intensity occurred when wind shear increase as given in the WRF standard-release and the 20 % decreasing scenario. Different situation is found in the 20 % increasing scenario where wind shear tend to weak and lead to strong wind intensity at this stage. Meanwhile, the reduction of moisture supply at 850-700 hPa resulting from 20 % decreasing relative humidity play a major role in the weakening of wind intensity and reduces mechanical energy of the cycle process as much as 300 J kg-1.
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