Judul: Faktor-faktor yang Mempengaruhi Permintaan Beras Organik Mentik Susu (Studi Kasus: Outlet Pamor, Bogor, Jawa Barat)
Abstrak: Outlet Pamor adalah outlet yang menjual beras organik mentik susu. Permintaan beras organik mentik susu meningkat setiap bulannya, namun permintaan tersebut tidak dapat dipenuhi. Tujuan dari penelitian ini adalah untuk mengetahui karakteristik konsumen, menganalisis faktor-faktor yang mempengaruhi permintaan beras organik mentik susu dan elastisitas permintaanya. Metode analisis regresi linear berganda dipilih dalam penelitian ini. Hasil penelitian ini mayoritas konsumen berjenis kelamin wanita, usia 40 hingga 49 tahun, memiliki tiga hingga empat anggota keluarga, berpendidikan sarjana, pekerjaan sebagai ibu rumah tangga, memiliki pendapatan diatas RP 5.600.000 setiap bulannya. Harga beras organik mentik susu, pendapatan, jumlah anggota keluarga, selera dan promosi mempengaruhi permintaan beras organik mentik susu. Berdasarkan elastisitas harga, beras organik mentik susu termasuk kedalam barang yang elastis. Berdasarkan elastisitas pendapatan, beras organik mentik susu termasuk kedalam barang normal. Berdasarkan elastisitas silang, beras non organik dikategorikan sebagai barang subsitusi dari beras organik mentik susu.
Keyword: Elasticity of Demand, Multiple Regression Analysis, Organic Rice.

Judul: Analisis Faktor-Faktor yang Memengaruhi Permintaan Sayuran Organik di Kota Bogor.
Abstrak: Ada beberapa kelompok konsumen yang lebih memilih untuk mengalihkan konsumsi sayuran non organik ke sayuran organik meskipun harganya relatif lebih mahal. Bayam organik dan kangkung adalah dua jenis sayuran organik yang banyak diminati konsumen saat ini. Penelitian ini bertujuan untuk menganalisis faktor-faktor yang memengaruhi permintaan bayam organik dan kangkung organik di Kota Bogor dan untuk mengetahui elastisitas masing-masing faktor. Penelitian ini menggunakan metode deskriptif dan analisis regresi linier berganda melalui metode taksiran OLS. Jumlah total responden adalah sebanyak 85 konsumen masing-masing 40 konsumen bayam organik dan 45 konsumen kangkung organik. Faktor-faktor yang memengaruhi permintaan bayam organik secara signifikan adalah harga bayam organik dan jumlah anggota keluarga. Sedangkan permintaan kangkung organik dipengaruhi secara signifikan oleh harga kangkung organik, pendapatan rumah tangga perbulan, dan jumlah anggota keluarga. Elastisitas permintaan bayam organic bersifat inelastis (E<1) sedangkan elastisitas permintaan kangkung organik bersifat elastis (E>1).
Keyword: bayam organik, kangkung organik, OLS, permintaan

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