Judul: Perlakuan Naungan dan Pupuk Nitrogen Terhadap Pertumbuhan dan Fisiologis Tanaman Gandarusa (Justicia gendarussa Burm. F.)
Abstrak: Gandarusa merupakan tanaman semak yang belum banyak dibudidayakan padahal berpotensi menjadi bahan obat-obatan herbal. Penelitian ini bertujuan menganalisis pengaruh naungan dan pupuk nitrogen terhadap pertumbuhan dan fisiologis tanaman gandarusa. Tahapan uji yang dilakukan adalah uji pertumbuhan, fotosintesis, klorofil, dan karbohidrat daun gandarusa. Rancangan percobaan yang dipakai adalah desain split-plot dengan petak utama merupakan naungan (S) (0% (S0), 25% (S25), dan 50% (S50)) dan anak petak merupakan pupuk nitrogen (N) (0 (N0), 90 (N90), 180 (N180), dan 270 (N270) kg/ha). Hasil penelitian menunjukkan interaksi antara naungan dan pemupukan hanya pada jumlah cabang (JC) namun tidak pada tinggi tanaman (TT) dan jumlah daun (JD). Perlakuan S0 dan N270 merupakan perlakuan terbaik pada proses pertumbuhan dengan nilai tertinggi pada TT (39,8 cm (S0) dan 34,3 cm (N270)), JD (60,8 helai (S0) dan 45,8 helai (N270)), dan JC (11,4 cabang (S0) dan 10,8 cabang (N270)). Laju fotosintesis tertinggi didapatkan pada kombinasi perlakuan naungan 0% dan pupuk N 0 kg/ha (S0N0) dengan nilai 23,91 μmol CO2 m-2s -1 . Adapun, perlakuan dengan kadar klorofil total tertinggi didapat pada S25 (0,902 mg/g) dan N270 (0,832 mg/g). Serta kadar karbohidrat per bobot basah daun tertinggi didapatkan pada S0 (72,88 mg/g) dan N270 (76,25 mg/g).
Keyword: gandarusa, nitrogen fertilizer, and shading

Judul: Productivity of phenolic, flavonoid, and antioxidant of Justicia gendarussa at different shades and dose of nitrogen fertilizer
Abstrak: Penelitian ini bertujuan menentukan kombinasi naungan dan dosis pupuk nitrogen yang dapat menghasilkan produktivitas fenolik, flavonoid, dan antioksidan terbaik pada bagian aerial parts dari gandarusa (Justicia gendarussa). Rancangan split-plot digunakan pada penelitian ini dengan naungan (0, 25, dan 50%) sebagai petak utama dan dosis pupuk nitrogen (0, 90, 180, dan 270 kg/ha) sebagai anak petak. Hasil penelitian menunjukkan bahwa produktivitas fenolik, flavonoid, antioksidan, dan bobot kering tertinggi didapat pada perlakuan tanpa naungan dengan dosis pupuk nitrogen 270 kg/ha. Panen bobot kering tanaman mencapai 10,9 gram/tanaman. Produktivitas fenolik adalah 210 mg GAE/tanaman, sedangkan produktivitas flavonoid 112 mg QE/tanaman. Produktivitas antioksidan dengan metode DPPH, ABTS, FRAP, dan CUPRAC berturut-turut adalah 63,5; 334; 171; 525 µmol TE/tanaman. Analisis Pearson menunjukkan bahwa produktivitas fenolik dan flavonoid sangat berkolerasi kuat dengan produktivitas antioksidan. Tanpa naungan dengan dosis pupuk nitrogen 270 kg/ha merupakan kombinasi perlakuan budi daya paling tertinggi berdasarkan parameter penelitian, yaitu naungan dan dosis pupuk nitrogen berbeda., This study aims to determine the combination of shade and the dose of nitrogen fertilizer that can produce the best productivity of phenolic, flavonoid, and antioxidant of aerial parts of gandarusa (Justicia gendarussa). A split-plot design was used in this study with shade (0, 25, and 50%) as the main plot and nitrogen fertilizer doses (0, 90, 180, and 270 kg/ha) as subplots. The results showed the highest productivity of phenolics, flavonoids, antioxidants, and dry weight in the treatment without shading with a dose of 270 kg/ha of nitrogen fertilizer. The dry weight harvest of the plants was 10.9 g/plant. The phenolic productivity was 210 mg GAE/plant, while the productivity of flavonoids was 112 mg QE/plant. Antioxidant productivity using DPPH, ABTS, FRAP, and CUPRAC methods were 63.5; 334; 171; 525 µmol TE/plant, respectively. Pearson correlation shows that the productivity of phenolics and flavonoids is highly correlated with antioxidant productivity. Without shading and a dose of nitrogen fertilizer of 270 kg/ha was the best combination of cultivation treatments based on the research parameters based on shading and dose of nitrogen fertilizer.
Keyword: antioxidant, cultivation, flavonoids, Justicia gendarussa, phenolics

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