Judul: Pemakaian air irigasi pompa dalam rangka meningkatkan pendapatan petani di Kabupaten Nganjuk
Abstrak: Penelitian ini bertujuan untuk mendapatkan jumlah air irigasi yang digunakan agar rasional secara teknis dan ekonomis bagi petani. Dengan demikian diharapkan petani dapat menentukan penggunaan air irigasi pompa yang paling menguntungkan dari sisi biaya yang dikeluarkan. Penelitian ini dilakukan di Desa Putukrejo, Nglaban (Kecamatan Loceret), Mlandangan dan Kepanjen (Kecamatan Pace) Kabupaten Nganjuk Propinsi Jawa Timur. Penelitian dilakukan pada bulan Mei 1991, dengan merekam data usahatani petani dari empat Musim Tanam, yaitu Musim Kemarau I, Musim Kemarau II, Musim Kemarau III 1990 dan Musim Hujan 1991. Petani responden diklasifikasikan menjadi dua bagian, yaitu petani pemakai pompa rakyat (milik petani sendiri atau disewa dari petani lain) dan pemakai pompa (yang disewa dari P₂AT). Pemerintah Penggunaan rata-rata air irigasi pompa oleh petani pemakai pompa P₂AT lebih kecil dibandingkan dengan pemakai pompa rakyat, karena penyaluran air pompa P₂AT ke masing- masing petak petani diatur dengan jadwal tertentu...
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Judul: Pengelolaan pompa air untuk irigasi pertanian dalam mengembangkan usaha tani di Desa Singasari, Kecamatan Jonggol, Kabupaten Bogor, Jawa Barat
Abstrak: Masalah air masih merupakan masalah utama bagi sebagian besar petani di beberapa daerah tertentu. Pemenuhan kebutuhan air bagi tanaman mutlak dilakukan, sehingga sistem usaha tani berkelanjutan dapat dipertahankan. Para petani tidak bisa mengandalkan air hujan untuk pemenuhan kebutuhan air tanaman dikarenakan kondisi hujan yang tidak bisa diprediksi turunnya. Sebagai pengganti air hujan, dibutuhkan sumber air untuk pemenuhan kebutuhan air tanaman, antara lain dari sungai atau airtanah. Irigasi yang bisa digunakan untuk memanfaatkan sumber air tersebut adalah irigasi pompa. Namun saat ini, para petani masih beranggapan mahalnya biaya yang dikeluarkan dalam pemanfaatan irigas pompa. Oleh karena itu, dibutuhkan suatu penelitian khusus mengenai analisis ekonomi penggunaan pompa untuk irigasi. Tujuan penelitian ini adalah untuk mengetahui harga air dan menganalisis kondisi usaha tani di lokasi penelitian dengan adanya irigasi pompa.
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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