Judul: Perbandingan Kualitas Air Susu Dari Perusahaan Peternakan Sapi Perah Dan Peternakan Sapi Perah Rakyat Di Kebun Pedes Kotamadya Bogor
Abstrak: Suatu penelitian untuk mengetahui kualitas air susu yang dihasilkan oleh peternakan rakyat dan perusahaan telah dilakukan terhadap air susu dari peternakan sapi perah di Kebun Pedes Kotamadya Bogor dari tgl 16 Februari samapai 31 Maret 1981. Jumlah peternak yang jumlah air susunya diamati terdiri dari 7 perusahaan dan 14 peternakan rakayat yang diambil secara acak sederhana.
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Judul: Pengkajian kualitas air susu di peternakan sapi perah, agen dan konsumen kotamadya padang
Abstrak: Suatu penelitian untuk mengkaji kualitas air susu yang dihasilkan oleh peternakan sapi perah rakyat dan perusahaan peternakan, Kotamadya Padang, serta pada agen- agen susu yang berfungsi sebagai lembaga yang memasarkan susu, dilakukan mulai tanggal 4 April sampai 16 Mei 1983. Disamping itu dilakukan pengkajian kemungkinan-kemungkinan kemunduran atau penurunan kualitas air susu mulai dari produsen sampai pada konsumen. Penetapan pengambilan contoh dilakukan secara acak. Penelitian ini dilakukan terhadap 13 contoh susu asal pe- ternakan sapi perah rakyat, 9 contoh susu yang berasal dari perusahaan peternakan sapi perah, 9 contoh susu yang berasal dari agen dan 10 contoh susu yang berasal dari konsumen. Pengamatan kualitas air susu meliputi pengujian ter- hadap uji kebersihan, uji alkohol, berat jenis, penentuan kadar lemak dan bahan kering tanpa lemak. Pengujian Perbedaan kualitas air susu antara masing- masing lembaga dianalisis secara statistik yang mengguna- kan Uji-t Student dan Uji-t Behrens-Fisher. Hasil Penelitian didapatkan bahwa: air susu asal peternakan sapi perah rakyat, perusahaan peternakan sapi perah, agen dan konsumen mempunyai berat jenis berturut-turut 1.0273, 1.0275, 1.0271 dan 1.0270. Kalau dibandingkan dengan kualitas air susu yang direkomendasikan Kodeks Susu ternyata berat jenis susu di Kotamadya Padang dibawah syarat minimal yaitu 1.0280. Antara masing-masing lembaga tersebut tidak memperlihatkan perbedaan yang nyata. Kadar lemak berturut-turut sebesar 3.67%, 3.72 %, 3.21 dan 3.57 %, kadar lemak dari semua tingkat pengelolaan % air susu tersebut sudah dapat dikatakan baik bila dibandingkan dengan kualitas air susu peternakan sapi perah rakyat di beberapa daerah dan persyaratan Kodeks Susu…dst
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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