Judul: Pengaruh taraf pupuk organik cair dekorgan terhadap pertumbuhan dan produksi tanaman melon(Cucumis melo L. var. reticulatus)
Abstrak: Percobaan ini berlangsung mulai bulan September hingga Desember 1992 di Rumah Plastik Kebun Percobaan IPB Tajur. Tujuan percobaan ini adalah untuk mengetahui pengaruh dan konsentrasi larutan pupuk organik cair Dekorgan yang tepat bagi pertumbuhan dan produksi tanaman melon. Alasan pelaksanaannya adalah selain pupuk organik cair Dekorgan belum umum digunakan oleh petani melon, juga untuk mendapatkan alternatif penggunaan pupuk organik selain pupuk kandang yang sering menjadi salah satu sumber penyakit soil born seperti layu fusarium pada tanaman melon sehingga diharapkan dapat mengurangi penggunaan pupuk kandang yang berlebih. Percobaan ini dilakukan di bedengan- bedengan dalam rumah plastik. Bedengan berukuran panjang 300 cm, lebar 110 cm dan jarak antar bedengan 40 cm. Jarak tanam yang digunakan adalah 70 cm x 60 cm. Tanaman yang digunakan adalah melon Sky Rocket. Penanaman dilakukan secara transplanting dari bibit melon berumur 15 hari setelah semai. Penyemaian benih dilakukan pada media steril dalam kantong plastik putih berukuran kosong 15 cm x 12 cm atau berkapasitas 0.5 kg media.
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Judul: Penentuan Varietas dan Media Tanam Terbaik Pada Budidaya Melon (Cucumis melo L.) Menggunakan Teknologi Hidroponik
Abstrak: Penelitian ini bertujuan untuk mendapatkan varietas dan media tanam terbaik terhadap produksi dan kualitas melon pada sistem budidaya hidroponik di dalam rumah kaca. Penelitian dilaksanakan pada Januari-April 2012 di rumah kaca University Farm IPB, unit lapangan Cikabayan. Percobaan disusun dalam Rancangan Kelompok Lengkap Teracak (RKLT) faktorial 2 faktor dengan 4 ulangan. Faktor pertama adalah varietas melon (Golden Apollo, Sky Rocket, Red Aroma, dan Sun Lady), sedangkan faktor kedua adalah media tanam (arang sekam, kompos daun bambu, dan pupuk kandang ayam). Terdapat 48 satuan percobaan dan tiap satuan percobaan berisi 2 tanaman. Pada perkembangan vegetatif tanaman, terdapat perbedaan yang nyata antara varietas terhadap tinggi tanaman dan panjang ruas pada 1 dan 4 MST (minggu setelah transplan). Perbedaan nyata pada jumlah buku terjadi pada 1-3 MST. Varietas Sun Lady memiliki pertumbuhan terbaik diantara empat varietas yang diuji. Jenis media tanam memberikan pengaruh nyata terhadap tinggi dan jumlah buku selama 5 minggu. Perlakuan media tanam berpengaruh nyata terhadap panjang ruas pada 3-5 MST. Media tanam arang sekam dan kompos daun bambu menghasilkan data yang tidak berbeda nyata, akan tetapi lebih baik daripada media pupuk kandang ayam.
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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