Judul: Penyebaran dan Karakteristik Tempat Tumbuh Pohon Tembesu (Fragraea fragrans Roxb.) (Studi Kasus di Kawasan Taman Nasional Danau Sentarum Kapuas Hulu Kalimantan Barat).
Abstrak: Tujuan penelitian ini adalah untuk mengkaji penyebaran tempat tumbuh alami Tembesu (Fragraea fragrans Roxb) yang sesuai karakteristik habitatnya. Indikator karakteristik tempat tumbuh tembesu akan terlihat pada penyebaran tembesu di habitat alaminya. Sehingga diharapkan informasi yang penting ini dapat berguna sebagai dasar dalam tindakan pengelolan tembesu untuk pengembangannya di luar kawasan TNDS agar tembesu tumbuh optimal. Penelitian dilaksanakan di tiga lokasi penelitian yaitu di Sungai Bekuan, Danau Bekuan dan Danau Sumbu, pada kawasan Taman Nasional Danau Sentarum (TNDS) Kabupaten Kapuas Hulu Kalimantan Barat. Penelitian dilakukan yaitu mulai tanggal 22 april – 9 mei 2007 (efektif di lapangan).
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Judul: Induksi Tunas Adventif Dari Daun Tembesu (Fagraea Fragrans Roxb).
Abstrak: Tembesu (Fagraea fragrans Roxb.) merupakan salah satu species tanaman yang tumbuh di hutan rawa dan rawa gambut terutama di daerah Sumatra. Tembesu memiliki nilai ekonomi yang cukup tinggi berdasarkan manfaatnya, misalnya sebagai kayu ukir. Perbanyakan tembesu saat ini sangat sulit dilakukan dikarenakan tidak adanya sumber benih yang unggul. Tujuan dari penelitian ini adalah (1) Menganalisis teknik sterilisasi yang tepat untuk mendapatkan eksplan tembesu steril, (2) Menemukan modifikasi media tumbuh MS yang tepat berdasarkan konsentrasi nitrogen dan BAP untuk menghasilkan tunas adventif dari daun tembesu, (3) Menghasilkan bibit tembesu dari tunas adventif daun tembesu. Penelitian ini dilakukan di Laboratorium Kultur Jaringan Pusat Perbenihan dan Persemaian Rumpin, Bogor. Metode penelitian terdiri dari persiapan bahan tanaman, induksi tunas adventif, perbanyakan tunas adventif, elongasi, pengakaran dan aklimatisasi. Hasil penelitian menunjukkan bahwa teknik sterilisasi yang tepat untuk mendapatkan eksplan tembesu aseptik adalah dengan menggunakan perendaman NaOCl 0.5% selama 20 menit dan aklohol 70% selama 1 menit. Modifikasi media tumbuh MS yang tepat untuk mendapatkan tunas adventif dari daun tembesu adalah Media MS dengan konsentrasi nitrogen sebanyak 80 mmol ditambahkan dengan BAP sebanyak 1.5 ppm. Perbanyakan tunas adventif dilakukan dalam media modifikasi media MS dengan konsentrasi nitrogen 60 mmol (perbandingan NO3-:NH4 + = 3:1(g/g)) ditambah BAP 0.1 ppm. Jumlah tunas yang dihasilkan pada perbanyakan tunas adventif mencapai 35 tunas per eksplan. Tunas adventif (klon 2) merupakan asal tunas yang memiliki pertumbuhan lebih baik pada tahap elongasi, dan pengakaran. Tahap aklimatisasi menghasilkan bibit asal tunas adventif klon 4.
Keyword: daun, Fragraea fragrans, kultur jaringan, organogenesis, tembesu

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