Judul: Penaksiran potensi dan pemasarn kayu jeunjing (Paracerianthes falcataria) di wilayah Bogor bagian barat sebagai bahan dalam rangka peningkatan pengelolaannya
Abstrak: Kayu rakyat telah lama dikenal manfaatnya untuk berbagai macam keperluan. Di wilayah Bogor bagian Barat kayu rakyat didominasi oleh jenis jeunjing (Paraserianthes falcataria). Kayu jeunjing ini dimanfaatkan untuk industri kertas, chopstick, bahan bangunan, kayu bakar maupun kotak- kotak kemasan untuk buah-buahan. Sejalan dengan kemajuan teknologi pemanfaatan kayu maka muncul berbagai macam industri pengolahan kayu yang bahan bakunya berasal dari kayu rakyat. Hal ini menyebabkan permintaan kayu rakyat semakin besar dan wilayah pemasaran kayu rakyat semakin meluas dari tempat asalnya, namun demikian sekaligus juga timbul kekhawatiran terhadap kelestarian sumbernya.
Keyword: Kayu jeunjing

Judul: Pendugaan potensi dan analisis kelestarian kayu sengon (Paraserianthes falcataria) sebagai bahan baku industri pengolahan kayu di Kabupaten Kendal Jawa Tengah
Abstrak: Kayu rakyat merupakan komoditi ekonomi yang berasal dari hutan rakyat. Hutan rakyat selain memiliki fungsi produksi dan ekonomi, juga mempunyai fungsi yang lainnya seperti fungsi hidrologi dan konservasi. Di Wilayah kabupaten Kendal kayu rakyat didominasi oleh jenis sengon (Paraserianthes falcataria). Seiring kemajuan teknologi pemanfaatan kayu maka muncul berbagai macam industri pengolahan kayu yang menggunakan bahan baku kayu berasal dari kayu rakyat. Hal ini menyebabkan permintaan kayu rakyat semakin besar dan wilayah plemasarannya semakin meluas dari tempat asalnya, tetapi sekali. gus juga timbul kekhawatiran terhadap kelestarian sumbernya. Penelitian ini bertujuan untuk mempelajari dan mengkaji sistem pengelolaan hutan rakyat serta menduga potensi kayu sengon dan besarnya kebutuhan (permintaan) kayu sengon sebagai bahan baku industri pengolahan kayu di Kabupaten Kendal. Dalam pendugaan potensi kayu sengon, pemilihan daerah contoh dilakukan melalui metoda purposive sampling, yaitu daerah yang dianggap berpotensi sebagai pemasok kayu sengon ke industri-industri pengolahan kayu setempat. Dengan mempertimbangkan sifat keterwakilannya maka dipilih daerah yang memiliki potensi kayu sengon yang terbesar, sedang dan terkecil. Dengan demikian banyaknya daerah contoh adalah 3 kecamatan, 9 desa dan 27 pemilik/petani hutan rakyat. Selain itu dilakukan pula wawancara dan atau pengisian quessioner kepada para petani, tengkulak dan industri pengolahan kayu. ...
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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