Judul: Pengaruh Media Tumbuh Terhadap Pertumbuhan Anggrek Dendrobium Bertachong X Devy
Abstrak: Penelitian dilaksanakan dengan tujuan untuk mendapatkan media campuran pakis yang baik untuk pertumbuhan anggrek Dendrobium Bertachong x Devy
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Judul: Penggunaan berbagai jenis media terhadap pertumbuhan dan perkembangan tanaman anggrek Oncidium golden shower
Abstrak: Penelitian dilaksanakan dengan tujuan untuk mempelajari dan mengetahui pe- ngaruh berbagai jenis media dan diantaranya terdapat media yang memberikan penga- ruh paling baik terhadap pertumbuhan dan perkembangan tanaman anggrek Oncidium Golden Shower Penelitian dilakukan di kebun percobaan sub Balai Penelitian dan Pengembang- an Hortikultura, Pasar Minggu dengan menggunakan Rancangan Acak Kelompok Satu Faktor. Media yang digunakan adalah media tunggal dan media campuran yang terdiri dari enam taraf perlakuan. Untuk media tunggal meliputi media arang, media potongan sabut kelapa, dan media serat sabut kelapa sedangkan media campuran meliputi kombinasi media arang dan potongan sabut kelapa, media serat dan potongan tempurung kelapa serta media potongan tempurung dan kulit luar sabut kelapa. Hasil penelitian menunjukkan bahwa pengaruh media berbeda nyata terhadap pertambahan tinggi tanaman pada 6 MST dan 8 MST serta pada peubah lebar bulb tanaman pada 16 MST dan 18 MST. Untuk parameter vegetatif dan generatif lainnya tidak menampakkan perbedaan yang nyata. Namun media campuran arang dan po- tongan sabut kelapa memberikan nilai tertinggi terhadap perkembangan bulb tanaman dan anakan baik untuk panjang, lebar dan tebal bulb juga untuk jumlah tangkai, ca-. bang dan kuntum bunga serta panjang rangkaian bunga. Sedangkan media serat mem- berikan nilai tertinggi untuk peubah panjang dan lebar daun. Untuk peubah jumlah daun, jumlah akar dan panjang tangkai bunga media campuran potongan tempurung dan kulit luar sabut kelapa yang memberikan nilai tertinggi. Sedangkan media po- tongan sabut kelapa memberikan pengaruh terhadap peubah jumlah tunas terbanyak dan panjang akar yang paling panjang. Media campuran arang dan potongan sabut kelapa dapat dijadikan alternatif pengganti media pakis. Media ini mampu memberikan perkembangan bulb tanaman maupun anakan yang optimum dan perkembangan fase generatif yang cukup baik dengan dihasilkannya kualitas dan kuantitas bunga yang lebih baik dibanding perlakuan media lain….
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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