Judul: Perubahan Pola Penyebaran Kadar Air Media Arang Sekam dan Pertumbuban Tanaman Kangkung Darat (Ipomoea reptans Poir.) Pada Pemberian Air Secara Sinambung (Continue) Dan Terputus-Putus (Intermitient) Dengan Irigasi Tetes
Abstrak: Irigasi tetes merupakan suatu metode pemberian air kepada tanaman yang dapat memberikan efisiensi dan efektifitas yang lebih tinggi dibandingkan dengan metode pemberian air lainnya. Keberhasilan irigasi tetes ditentukan oleh penyebaran kadar air tanah di daerah perakaran yang menunjang pertumbuhan tanaman.
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Judul: Pendugaan penyebaran kadar air tanah pada irigasi tetes (Drip Irrigation)
Abstrak: Irigasi tetes merupakan suatu metode pemberian air ke- pada tanaman yang dapat memberikan efisiensi dan efektifi- tas yang lebih tinggi dibandingkan dengan metode pemberian air lainnya. Keberhasilan irigasi tetes ditentukan oleh penyebaran kadar air tanah di daerah perakaran yang menun- Jang pertumbuhan tanaman. Untuk menduga penyebaran kadar air tanah pada irigasi tetes digunakan persamaan aliran air di dalam tanah pada keadaan tidak jenuh dan persamaan kesinambungan, dengan be- berapa asumsi untuk menyederhanakan masalah. Penyelesaian dilakukan dalam tiga dimensi. Data yang diperlukan adalah kadar air awal, diffusivitas tanah, debit dan lama pemberi- an air. Perhitungan menggunakan komputer "IBM PC/XT Compa- tible" di Jurusan Mekanisasi Pertanian Institut Pertanian Bogor. Diperoleh bahwa penyebaran kadar air tanah pada iriga- 31 tetea dengan satu penetes akan semakin lebar dan dalam bila debit pemberian diperbesar atau pemberian semakin lama. Sedangkan kadar air tanah yang sama pada irigasi tetes de- ngan dua penetes cenderung tersebar semakin mendatar..dst
Keyword: Soil Water, Irrigation

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