Judul: Penentuan ukuran sasaran dan studi peta pengendalian pada industri papan sambung kayu jeunjing (paraserianthes falcataria (L.) Nielsen) di PT. Bumi Mahaphala Wilasa
Abstrak: Tujuan penelitian ini adalah untuk mengetahui penyimpangan ukuran dari papan sambung yang dibuat, sehingga dari hal itu akan diketahui besarnya pemborosan kayu yang terjadi. Dari data yang dikumpulkan, adanya keragaman ukuran dapat dijadikan informasi apakah proses pembuatan papan sambung itu dalam keadaan terkendali atau tidak, terutama untuk arah tebal dan panjang. Disamping itu yang lebih penting adalah mencari faktor-faktor yang menyebab- kannya.
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Judul: Pengaruh arah potongan papan kedewasaan kayu dan kadar air terhadap stabilisasi dimensi papan sambung kayu sengon (Paraserianthes falcataria (L) Nielsen
Abstrak: Salah satu teknologi pengolahan kayu yang mampu memanfaatkan kayu semaksimal mungkin adalah teknologi pembuatan papan sambung (jointed board). Teknologi ini dirasakan sangat tepat apalagi mengingat ukuran kayu yang akan diperoleh dari Hutan Tanaman Industri yang sedang giat dibangun lebih kecil dari ukuran kayu yang selama ini diolah di industri perkayuan di tanah air. Dengan papan sambung berarti kayu-kayu hasil HTI tersebut, dapat dijadikan berbagai macam produk sehingga dapat dimanfaatkan untuk berbagai keperluan. Pembuatan papan sambung memiliki beberapa keistimewaan, antara lain dapat dibuat dari kayu yang bermutu rendah dengan melakukan seleksi dan/atau memperbaiki cacat-cacat yang dikandungnya, dan dapat memanfaatkan kayu yang berukuran kecil. Dengan teknologi papan sambung, kayu-kayu yang bermutu rendah ataupun kayu-kayu yang berukuran kecil, dapat dijadikan produk dengan ukuran yang lebih besar sesuai dengan keinginan. Namun demikian papan sambung juga mempunyai kelemahan, yaitu sering mengakibatkan terjadinya perubahan dimensi. Beberapa asumsi yang mungkin dapat menyebabkan timbulnya kelemahan papan sambung adalah adanya perbedaan arah potongan papan pada waktu penyambungan, adanya perbedaan tingkat kedewasaan kayu antar papan yang disambung dan adanya perbedaan kadar air antar papan sewaktu di proses.
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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