Judul: Persaingan Pemasaran Produk Susu Bubuk Melalui Promosi Di Wilayah Kotamadya Surabaya
Abstrak: Penelitian ini dilakukan di Kotamadya Surabaya dan Jakarta selama tiga bulan mulai bulan Mei sampai Juli 1993. Tujuan penelitian adalah untuk mengetahui praktek dan intensitas promosi susu bubuk Dancow dan susu bubuk Bendera melalui media siaran televisi, radio, suratkabar, majalah dan promosi langsung di pasar Kotamadya Surabaya. Data diperoleh dari distributor, supermarket, biro advertensi yaitu berupa data volume penjualan susu bubuk Dancow dan Bendera, biaya periklanan di media radio, suratkabar, majalah, televisi (SCTV dan TPI) dan penyewaan raklgondola di supermarket.
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Judul: Persaingan Pemasaran Susu Bubuk Dancow dengan Susu Bubuk Bendera di Wilayah Kotamadya Bogor
Abstrak: Tulisan ini bertujan untuk mempelajari persaingan pemasaran yang terjadi antara susu bubuk Dancow dengan susu bubuk Bendera di wilayah Kotamadya Bogor dikaitkan dengan bauran pemasaran yang dilaksanakan oleh keduanya serta strategi yang telah dan akan dilakukan oleh kedua susu bubuk tersebut dalam menghadapi persaingan yang terjadi. Persaingan yang ketat dalam industri suatu produk membuat perusahaan-perusahaan yang ada di dalamnya merubah strategi dan konsep pemasaran yang selama ini mereka laksanakan. Pada awalnya, pemasaran lebih dipandang dari konsep produknya. Kemudian bergeser menjadi pemasaran yang lebih berorientasi pasar/konsumen dimana faktor persaingan pasar merupakan salah satu diantaranya.
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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