Judul: Pengaruh Persepsi terhadap Keputusan Pembelian Kecap Kemasan Sachet di Perkotaan dan Pedesaan
Abstrak: Saat ini kecap dijual dalam kemasan plastik berbagai ukuran dari ukuran besar sampai kemasan sachet sehingga, pentingnya untuk menganalisis faktor yang berpengaruh terhadap keputusan pembelian kecap kemasan sachet, salah satunya adalah persepsi. Penelitian dilakukan di Kelurahan Kebon Kalapa, Kota Bogor sebagai wilayah perkotaan dan Desa Galuga, Kabupaten Bogor sebagai wilayah pedesaan. Contoh dari penelitian ini adalah 147 rumah tangga. Penentuan contoh diambil secara simple random sampling. Analisis data yang digunakan adalah Chi-square, Independent sample t-test, uji korelasi Pearson, dan uji regresi logistik. Berdasarkan hasil uji di perkotaan, jumlah anggota keluarga dan persepsi harga berpengaruh signifikan terhadap keputusan pembelian kecap kemasan sachet. Secara keseluruhan persepsi harga berpengaruh signifikan terhadap keputusan pembelian kecap kemasan sachet.
Keyword: perilaku pembelian, persepsi, kecap kemasan, keputusan pembelian

Judul: Perilaku Pembelian Produk Kemasan Plastik Berdasarkan Ukuran dan Dampaknya terhadap Pengeluaran Keluarga di Perdesaan dan Perkotaan
Abstrak: Saat ini hampir semua produk kebutuhan sehari-hari dikemas dalam bentuk kemasan plastik. Penelitian ini bertujuan untuk menganalisis perilaku pembelian produk kemasan plastik berdasarkan ukuran terhadap pengeluaran keluarga di perdesaan dan perkotaan. Contoh penelitian ini adalah 150 keluarga yang terdiri dari 75 keluarga di daerah perdesaan dan 75 keluarga di daerah perkotaan yang dipilih secara acak. Hasil penelitian menunjukkan sebagian keluarga di perdesaan cenderung membeli produk-produk kemasan plastik ukuran kecil, sedangkan keluarga di perkotaan kurang dari separuhnya membeli ukuran kecil. Keluarga akan lebih hemat membeli kecap, kopi, sabun cuci, dan shampo dengan ukuran kecil, sedangkan untuk saus sambal, minyak goreng, dan penyedap rasa berlaku sebaliknya. Hasil analisis regresi logistik menunjukkan pendapatan per kapita, lama pendidikan istri, dan lokasi tempat tinggal berpengaruh terhadap perilaku pembelian produk kemasan plastik. Hasil analisis regresi linier berganda menunjukkan adanya pengaruh perilaku pembelian produk kemasan plastik terhadap pengeluaran keluarga.
Keyword: produk kemasan plastik,, ukuran kemasan, perilaku pembelian, pengeluaran keluarga

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