Judul: Pengaruh Suhu Udara Dan Dosis Pemupukan Nitrogen Terhadap Pertumbuhan Dan Perkembangan Tanaman Gandum (triticum spp.) Varietas dwr 162
Abstrak: Suhu udara rata-rata sangat berpengaruh terhadapa umur panen tanaman budidaya, sedang nitrogen digunakan untuk peningkatan berat kering tanaman dan untuk meningkatkan hasil panen. Da1am penelitian ini dipelajari pengaruh suhu uclara eli empat lokasi yang berbeda ketinggiannya, yaitu Mojosari (28 m dpl.), Singosari (500 m dpl.), Nongkojajar (900 m dpl.) dan Cangar (1.650 111 dpl.) serta pengaruh dosis pemllpukan nitrogen dengan dosis pemllpukan 0 kg N/ha, 50 kg N/ha dan 100 kg N/ha
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Judul: Respon Perkembangan Dan Protein Biji Gandum Terhadap Interaksi Ketersediaan Air Dan Nitrogen Varietas Dwr 162
Abstrak: Penelitian ini dalam upaya membantu pengembangan tanaman gandum di Indonesia. Tanaman gandum dapat tumbuh dengan baik apabila ketersediaan airnya terpenuhi. Selain itu guna meningkatkan pertumbuhan dan perkembangan tanaman dibutuhkan jumlah nitrogen yang eukup. Interaksi ketersediaan air dan pemupukan nitrogen akan mempengaruhi perkembangan, hasil, dan kadar protein bij i gandum. Pada penelitian ini terdapat dua perlakuan yaitu perlakuan waktu tanam dan pemupukan nitrogen. Lahan seluas 3000 m2 dibagi menjadi tiga blok ulangan. Pada setiap blok ulangan dibuat dua belas petak perlakuan waktu tanam dan pemupukan nitrogen. Perlakuan waktu tanam (petak utama) dilakukan dengan selang waktu satu minggu pada empat waktu tanam yang berbeda yaitu WI, W2, W3, dan W4. Pada petak utama dilakukan pemupukan nitrogen dengan 3 taraf pemupukan berbeda yaitu 0 kgN/ha sebagai NO, 50 kgN/ha sebagai N I, 100 kgN/ha sebagai N2. Hasil penelitian ini menunjukkan akumulasi eurah hujan lebih tinggi dari 416 mm/musim akan menurunkan hasil gandum. Pada penelitian ini tanaman gandum diduga mengalami keracunan seiring peningkatan tarafpemupukan nitrogen sehingga menurunkan hasil gandum. Hasil gandum di Bogor (300 m dpl) lebih rendah dibandingkan dengan Singosari (500 m dpl), Nongkojajar (900 m dpl), dan Cangar (1650 m dpI) selain disebabkan faktor suhu udara yang lebih tinggi, kemungkinan juga disebabkan pH tanah yang sangat masam. Hasil gandum meningkat menurut ketinggian tempat, namun kadar protein justru mengalami penurunan. Penurunan kadar protein diduga disebabkan oleh adanya proses pelarutan protein pada biji gandum, kadar nitrogen menurun dengan pertambahan massa biji.
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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