Judul: Kajian Potensi dan Supply-Demand Airbumi di Kecamatan Citeureup, Kabupaten Bogor
Abstrak: Human life creature else cannot life without groundwater. In Citeureup subdistrict, groundwater utilization for industry and housekeepinGunung Groundwater utilization need be increasinGunung Whereas groundwater availability be limited by nature condition in this area. Highly productive aquifer in Citeureup subdistrict is obtained from the alluvium river deposits, mainly a long both sides of Citeureup rivers, Cileungsi rivers, and Cijere riverSungai Well yield ranges between 2 and 5 l/sec in sand and gravel deposits with intergranular groundwater flow. Good quality of groundwater still found both in shallow and depth of aquifer. Based on quantity and quality of groundwater, the management of supply demand balance must be done. This study to give description about availability and demand of groundwater for supporting activity in Citeureup subdistrict.
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Judul: Kajian Potensi Pasokan Mata Air Di Kecamatan Cidahu
Abstrak: Airbumi merupakan sumber daya yang berpotensi dalam menunjang kebutuhan hidup orang banyak. Salah satu bentuk pemunculan airbumi yang alami, dan terbentuk akibat adanya perpotongan dengan muka tanah adalah mata air. Pada saat ini, beberapa daerah resapan mata air (khususnya di Pulau Jawa) telah mengalami kerusakan yang mengkhawatirkan. Mata air di daerah Bogor, Purwokerto, dan Malang telah mengalami penurunan debit bila dibandingkan dengan kondisi tahun 1970 an. Terjadi penurunan nyata pada debit Mata Air Tangkil yang terletak di Kecamatan Caringin, Kabupaten Bogor sejak tahun 1997 hingga 2004 (Aristyana, 2005). Oleh karena itu dibutuhkan pengkajian terhadap berbagai faktor dinamis seperti perubahan tata guna lahan dan curah hujan, dan faktor statis seperti jenis tanah, litologi maupun sebaran akifernya. Kajian tersebut diharapkan dapat memberikan informasi yang cukup detail mengenai keterdapatan, penyebaran, dan kapasitas mata air. Tujuan penelitian ini adalah memetakan lokasi dan kapasitas dari informasi inventarisasi mata air di Kecamatan Cidahu, mengkaji variasi dari data deret waktu mata air yang memiliki rekaman dengan kurun waktu yang cukup panjang, dan membuat peta spasial dan penampang geologi mata air untuk mengidentifikasi daerah resapan. ....
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Judul: Algorithm construction of HLI hash function
Abstrak: Cryptography is a study of mathematical techniques related to aspects of information security regarding on confidentiality, data integrity, entity authentication, and data origin authentication. Data integrity is a service, which is associated with the conversion of data carried out by unauthorized parties. To maintain data integrity, one can use hash functions. An hash function is a computationally efficient function to map an arbitrary length bitstring to a fixed length bitstring called as hash value. The use of hash function in maintaining the information integrity and authentication is in digital signatures, virus protection, and software distribution. Illustration of the hash function in the integrity and authentication of information that is emailed as follow. The sender sends the information and hash value to the recipient. If the hash value of the information is equal to the hash value that is sent by the sender, then information has not been changed. Otherwise the information has been changed. An hash function has two properties, one way and collision resistance. An hash function is called one way if it is computationally infeasible to find any input such that when given any hash value . Meanwhile an hash function is called collision resistant if it is computationally infeasible to find any two inputs where such that . The purpose of this study is to construct a HLI hash function algorithm, to analyze the speed and security of the hash functions as a results of construction. Furthermore, it is to compare it with SWIFFT. Hash function is constructed based on the result of algebraic operations on modular polynomial ringwith . Modular polynomial ring noted as is a set of all polynomials of degree at most with coefficients in . can be represented as a set of integer vector of modulo in dimension . So, it is simple to implement in a computer. In vector operations, is lattice . Furthermore, alattice that is defined from certain polynomial ring is called ideal lattice. HLI hash function is consists of addition and multiplication algorithm in the ring. Addition algorithm consists of sumation operations of modulo and multiplication consists of multiplication operations of modulo . Generally, algorithm of HLI hash function consists of multiplication operations of modulo and addition operations of modulo . However, if the input is binary number then multiplication algorithm only consists of multiplication operation of modulo , so algorithm of HLI hash function consists of multiplication operations of modulo and addtion operations of modulo . An hash function is secured if it has two properties, i.e., one way and collision resistance. HLI hash function hash is one way, it is following the proof of Micciancio. It is has collision resistant because of polynomial is irreducible over and monic. Moreover, it is proved that for every unit vector , the vector is small vector. If the input of hash function is a binary number then HLI hash function only involves addition operations of modulo . So the time that used almost same with SWIFFT. The excellence of HLI hash function is the key size smaller than SWIFFT. This effect on
Keyword: hash function, modular polynomial ring, lattice