Judul: Subtitusi kompos azolla (Azolla microphylla Kaulfuss) pada pemupukan N-urea terhadap pertumbuhan tanaman katuk (Sauropus androgynus (l.) Merr.)
Abstrak: Penelitian ini bertujuan untuk: (1) Mengetahui pengaruh dosis pemupukan nitrogen yang berbeda terhadap pertumbuhan dan produktivitas tanaman katuk; (2) Mengetahui pengaruh dosis penambahan kompos azolla yang berbeda. terhadap pertumbuhan dan produktivitas tanaman katuk; dan (3) Mengetahui pengaruh interaksi antara dosis pemupukan nitrogen dan penambahan kompos azolla dengan dosis yang berbeda terhadap pertumbuhan dan produktivitas tanaman katuk. Penelitian ini menggunakan Rancangan Petak Terbagi (Split Plot Design) dengan dua faktor, yaitu perbedaan dosis pemupukan nitrogen sebagai petak utama dan perlakuan kompos azolla sebagai anak petak. Faktor pemupukan nitrogen terdiri atas dosis 0, 100, 200 dan 400 kg/ha, sedangkan faktor pemupukan kompos azolla terdiri dari perlakuan 0, 1, 2 dan 4 ton/ha. Seluruhnya terdapat 16 kombinasi perlakuan dengan tiga ulangan sehingga terdapat 48 satuan percobaan. Setiap ulangan terdiri dari 16 petak percobaan, setiap petak berukuran 3 m x 1.2 m. jarak tanam dalam petakan adalah 30 cm x 10 cm dan jarak tanam antar petak 50 cm. Hasil penelitian menunjukkan bahwa penanaman dosis nitrogen nyata meningkatkan parameter Penambahan dosis nitrogen nyata meningkatkan parameter pertumbuhan tanaman katuk. Semakin meningkatnya dosis nitrogen yang diberikan akan meningkatkan tinggi tanaman, jumlah daun, jumlah cabang dan ILD yang dihasilkan. Dosis nitrogen 400 kg urea/ha menunjukkan pengaruh tertinggi. Pemupukan kompos azolla tidak menunjukkan hasil yang berbeda nyata terhadap semua parameter pengamatan. Hal ini diduga karena dosis kompos azolla yang diberikan kurang tinggi sehingga peranan sebagai substitusi pupuk nitrogen tidak nampak, demikian pula pengaruh bahan organik sebagai pembenah tanah (soil conditioner), karena curah hujan yang cukup tinggi.
Keyword: Azolla microphylla Kaulfuss, Sauropus androgynus (l.) Merr., Katuk plant

Judul: Response of Shade and Fertilizer Dosage on Growth and  Yield of Katuk (Sauropus androgynus (L.) Merr.).
Abstrak: Katuk (Sauropus androgynus (L.) Merr.) adalah salah satu jenis sayuran indigenous di Indonesia yang memiliki potensi untuk dikembangkan sebagai sayuran alternatif untuk memenuhi kebutuhan nutrisi. Penelitian ini bertujuan untuk mengetahui pengaruh intensitas naungan dan dosis pupuk yang sesuai guna meningkatkan pertumbuhan dan hasil produksi katuk. Percobaan dilakukan menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) faktor Split plot dengan petak utama adalah naungan dan anak petak adalah dosis pemupukan. Intensitas naungan terdiri dari 4 taraf, yaitu N0 (tanpa naungan), N1 (naungan 55%), N2 (naungan 65%), dan N3 (naungan 75%). Dosis pemupukan juga terdiri dari 4 taraf, yaitu P1 (50 kg ha-1), P2 (100 kg ha-1), P3 (150 kg ha-1), dan P4 (200 kg ha-1). Penelitian dilakukan dengan 3 ulangan sehingga diperoleh 16 kombinasi, dengan 48 satuan percobaan. Hasil penelitian menunjukkan tidak terdapat interaksi antara naungan dan dosis pemupukan. Perlakuan tunggal dosis pemupukan tidak memberikan pengaruh terhadap seluruh parameter pengamatan. Perlakuan naungan berpengaruh terhadap seluruh peubah pengamatan kecuali pada diameter batang saat pengamatan 2 MST dan 3 MST. Bobot panen komersial yang dipanen pada 8 MST mencapai hasil optimum pada aplikasi naungan 65%. Kata kunci: paranet, sayuran indigenous, dan sayuran komersial, Katuk (Sauropus androgynus (L.) Merr.) is one of the indigenous vegetables in Indonesia which has the potential to be developed as an alternative vegetable to meet nutritional needs. This study aims to determine the effect of shade intensity and appropriate dose of fertilizer to increase growth and yield of katuk production. The experiment was carried out using a completely randomized block design (RKLT) with split plot factors with the main plot being shaded and sub-plots being the dose of fertilization. Shade intensity consisted of 4 levels, namely N0 (without shade), N1 (55%), N2 (65%), and N3 (75% shade). The fertilization dose also consisted of 4 levels, namely P1 (50 kg ha-1), P2 (100 kg ha-1), P3 (150 kg ha-1), and P4 (200 kg ha-1). The study was conducted with 3 replications so that 16 combinations were obtained, with 48 experimental units. The results showed that there was no interaction between shade and fertilization dose. Single treatment of dose fertilization did not give effect on all parameter of observation. Shade treatment affected all observation variables except for stem diameter at 2 WAP and 3 WAP. Commercial harvest weights harvested at 8 WAP achieved optimum yields at 65% shading applications. Keywords: commercial vegetable, indigenous vegetable, and paranet
Keyword: commercial vegetable, indigenous vegetable, paranet

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