Judul: Evaluasi Pertumbuhan Jabon (Anthocephalus cadamba (Roxb.) Miq) pada Berbagai Tempat Tumbuh di PT Lestari Mahaputra Buana Padalarang, Kabupaten Bandung Barat.
Abstrak: Jabon (Anthochephalus cadamba) saat ini mulai menjadi andalan industri kayu karena pertumbuhannya yang cepat. Tujuan penelitian ini mengetahui kualitas tempat tumbuh dan pengaruh teknik silvikultur yang diterapkan dalam upaya meningkatkan pertumbuhan tanaman jabon di PT Lestari Mahaputra Buana. Parameter yang diamati adalah karakteristik lahan, pertumbuhan tanaman, dan riwayat perlakuan silvikultur. Hasil penelitian ini menunjukkan bahwa lahan lokasi penelitian memiliki ketinggian tempat 376 – 469 m dpl, curah hujan ratarata 2395 mm/tahun, dan suhu rata-rata 23.69 oC sesuai dengan syarat pertumbuhan tanaman jabon. Pertumbuhan jabon paling tinggi pada tanah merah (andosol) dengan kadar air berkisar antara 12.11% – 23.19% dan tekstur tanah granular serta gumpal membulat sedangkan pertumbuhan terendah terdapat pada tanah putih (latosol) dengan kadar air berkisar antara 3.99% – 13.27%, dan struktur tanah lempeng serta lempeng bersudut. Perlakuan silvikultur yang diterapkan pada setiap umur tegakan tidak terlalu mempengaruhi nilai pH, Corganik, dan KTK. Tanah merah merupakan jenis tanah yang paling sesuai untuk pertumbuhan tanaman jabon.
Keyword: Karakteristik lahan, kayu industri, pertumbuhan tanaman, tanah

Judul: Pengaruh Penjarangan dan Lokasi terhadap Pertumbuhan Tegakan Jabon (Anthocephalus cadamba Roxb.) di PT. Lestari Mahaputra Buana Padalarang, Kabupaten Bandung Barat
Abstrak: Jabon (Anthocephalus cadamba) merupakan jenis alternatif pengganti jelutung dan pulai yang ketersediaannya semakin berkurang sebagai bahan baku dalam pembuatan pensil. Tujuan penelitian adalah pengaruh penjarangan dan lokasi terhadap petumbuhan tegakan jabon diberbagai lokasi di PT. Lestari Mahaputra Buana Padalarang, Kabupaten Bandung Barat. Lokasi penelitian berada di ketinggian 347 – 405 mdpl dan suhu rata-rata 31.35 oC. Hasil pengamatan tentang sifat fisik tanah adalah struktur tanahnya berbentuk gumpal bersudut, tekstur tanahnya lempung liat berdebu (silty clay loam), bulk density berkisar 1.18 – 1.28 g/cc, kadar air tanah berkisar 24.62 – 28.94, dan permeabilitas tanah berkisar 0.64 – 0.82 cm/jam. Perlakuan penjarangan berpengaruh nyata (taraf 95%) pada peubah diameter setelah 2 bulan (0.58 cm) dan setelah 4 bulan (0.66 cm). Faktor lokasi dan interaksi (perlakuan dan lokasi) tidak berpengaruh nyata terhadap pertumbuhan tegakan jabon disemua peubah (tinggi total, tinggi bebas cabang dan diameter).
Keyword: Anthocephalus cadamba, penjarangan, pertumbuhan tegakan jabon, tanah

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