Judul: Dormancy Breaking Methods of Ketapang Kencana (Terminalia mantaly) Seeds
Abstrak: Budidaya ketapang kencana secara generatif memiliki kendala karena adanya dormansi benih, sifat dormansi ini dapat dihilangkan melalui metode pematahan dormansi untuk memperbaiki viabilitas dan vigor benih. Penelitian bertujuan menganalisis metode pematahan dormansi yang tepat untuk benih ketapang kencana. Perlakuan pematahan dormansi yang diterapkan adalah: (1) kontrol, (2) benih dipotong, (3) benih diampelas, (4) benih direndam dalam larutan H2SO4, (5) benih direndam air panas, (6) benih direndam air 12 jam, (7) benih direndam air 72 jam. Hasil penelitian menunjukkan terdapat tiga perlakuan yang tepat yaitu pemotongan, pengampelasan dan perendaman benih dalam air selama 12 jam. Perlakuan pematahan dormansi berpengaruh nyata terhadap indeks perkecambahan, pertumbuhan kecambah normal (berat kering, tinggi kecambah, panjang akar) dan awal mula tumbuh kecambah. Benih berukuran besar memiliki indeks perkecambahan, potensi tumbuh maksimum, daya berkecambah, vigor benih dan berat kering kecambah lebih tinggi dibandingkan dengan benih yang berukuran lebih kecil., The generative cultivation of Ketapang Kencana has problems due to seed dormancy, this dormancy can be removed through the dormancy breaking method to improve seed viability and vigor. This study aims to analyze the appropriate dormancy breaking methods for Ketapang Kencana. The dormancy breaking treatments applied were: (1) control, (2) seeds cut, (3) seeds sanded, (4) seeds soaked in H2SO4 solution, (5) seeds soaked in hot water, (6) seeds soaked in water 12 hours, (7) seeds soaked in water 72 hours. The results showed that there were three appropriate treatments, cutting near the growing point, sanding, and soaking the seeds in water for 12 hours. The treatment of breaking dormancy had a significant effect on germination index, normal germination growth (dry weight, sprout height, root length), and early germination. Seed size affects germination and dry weight of normal germination. Large seeds had a higher germination index, maximum growth potential, germination capacity, seed vigor and dry weight of germination compared to smaller seeds.
Keyword: seed dormancy, seed germination, seed size, seed vigor, Terminalia mantaly

Judul: Pengaruh Pematahan Dormansi Terhadap Kemampuan Perkecambahan Benih Angsana (Pterocarpus Indicus Will)
Abstrak: INTRODUCTION. So far, Seedling production of Angsana (Pterocarpus indicus Will) is done by stem cutting. Seedling propagation by seeds is not done widely, as well as its silvicultural system is still not known yet. Seed germination percentage is affected strongly by seed quality (physic, genetic and physiology). The main problem of seed germination of Angsana seeds is seed coat dormancy; therefore it is important to study the breaking dormancy techniques of Angsana seeds. The aim of this research was to study the effects of breaking dormancy treatment to the germination capacity of Angsana seeds. MATERIAL AND METHOD. This research was done from 30 June to 28 Agust 2008 at Green House, the Laboratory of Silviculture, Faculty of Forestry, Bogor Agricultural University. The material and equipment used in this experiment consisted of Angsana seeds, hot water, H2SO4, KNO3, water from fermented bamboo shoots (Gigantochloa apus Kurz), rice hull charcoal, subsoil, germination boxes, soaking bath, watering equipment, analytical balance, stationary, ruler, calliper, and digital camera. The research procedures consisted of several steps; those were seed extraction and selection, seed water content measurement, breaking dormancy treatments, germination, maintenance, observation, and data collection and analysis. The experimental design in this research was completely randomised design which consisted of 6 soaking treatments, those were soaking in hot water for 30 minutes followed by soaking in cold water for 12 hours (B0), soaking in the fermented bamboo shoot liquid for 12 hours (B1), soaking in H2SO4 1% for 10 minutes (B2), soaking in H2SO4 1 % for 15 minutes (B3), soaking in KNO3 1 % for 12 hours (B4) and soaking in KNO3 for 24 hours (B5). Each experiment unit was replicated in three replicates. The observed parameters consisted of germination capacity, germination value, speed of germination, germination rate, germination time at 80%, high and diameter of transplanted seedlings. The collected data was analysed using F test followed by Duncan Multiple Range Test (DMRT). RESULTS AND CONCLUSSION. Angsana seeds had embryonic and seed coat dormancies. Based the results of F test and Duncan test showed that soaking in H2SO4 1% for 10 minutes and in KNO3 1 % for 24 hours could break those dormancies. It was indicated by it high germination percentage (100 %), and other values such as germination value (1,13% to 1.05% normal germinants/day2), germination speed (1, 41 %/day), germination rate (19,32 – 18,59 day), germination time at 80% (25 day), seedlings height (1,53 cm) , and diameter growth (1,06 mm to 1,1 mm) respectively. Key word: Angsana, Pterocarpus indicus Will, Dormancy.
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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