Judul: Status NPK Tanah dan Karakteristik Vegetasi di Bawah Beberapa Jenis Tegakan Tanaman di UP3J Jonggol
Abstrak: Tujuan dari penelitian ini untuk mengevaluasi status NPK tanah dan karakteristik vegetasi di bawah beberapa jenis tegakan tanaman di UP3J Jonggol. Penelitian ini merupakan penelitian eksploratif dengan menggunakan analisis deskriptif terhadap status NPK tanah dan karakteristik vegetasi di bawah tegakan sorgum, rumput pakchong, dan indigofera, berdasarkan periode produksi tanaman. Hasil penelitian menunjukkan bahwa kondisi tanah pada lahan sorgum, rumput pakchong, dan indigofera di UP3J Jonggol kering sampai bergenang, berwarna coklat (7,5 YR 4/3) sampai coklat kehitaman (7,5 YR 2/1), dan bertekstur liat halus sampai liat berat. Sifat kimia tanah dari ketiga lahan tersebut yaitu memiliki pH dengan kriteria agak asam (5,90 - 6,50) sampai netral (6,60 - 6,65), C-organik sedang sampai tinggi (2,71 - 4,86), nitrogen rendah sampai sedang (0,18% - 0,46%), fosfor sangat rendah sampai tinggi (7,11 - 50,94 ppm), dan kalium sangat rendah sampai rendah (5,66 -18,93 ppm). Terdapat 32 spesies vegetasi di bawah tegakan sorgum, 21 jenis di bawah tegakan rumput pakchong, dan 19 spesies vegetasi di bawah tegakan indigofera selama periode produksi, dengan keanekaragaman jenis vegetasi di bawah tegakan termasuk sedang. Berdasarkan penelitian yang dilakukan dapat disimpulkan bahwa status NPK tanah di unit UP3J Jonggol, pada lahan sorgum dan rumput pakchong termasuk kategori rendah sampai sedang, sedangkan untuk lahan indigofera termasuk kategori sangat rendah sampai sedang. Beberapa spesies vegetasi yang mendominasi di bawah tegakan sorgum yaitu Mimosa pudica L., Commelina diffusa Burm. f., dan Digitaria sanguinalis (L.) Scop. Spesies vegetasi yang mendominasi di bawah tegakan rumput pakchong yaitu Cyperus rotundus L., Eclipta prostrata (L.) L, dan Allium tuberosum Rottler ex Spreng.. Sedangkan di bawah tegakan indigofera di dominasi Digitaria sanguinalis (L.) Scop., dan Ludwigia palustris (L.) Elliot
Keyword: indigofera, karakteristik, NPK tanah, rumput pakchong, sorgum

Judul: Potensi dan Karakteristik Sebaran Vegetasi pada Lahan  yang Berbeda di UP3J, Bogor, Jawa Barat
Abstrak: Penelitian ini bertujuan untuk mengevaluasi potensi pakan dan daya tampung tutupan lahan di UP3J Bogor Jawa Barat. Metode yang digunakan dalam penelitian ini adalah metode survei dan pengukuran langsung serta observasi di lapangan. Pengukuran produksi hijauan dilakukan dengan menggunakan kuadran berukuran 0,5 m x 0,5 m. Hasil analisis menunjukkan bahwa produksi bahan kering dan segar hijauan tertinggi terdapat pada padang penggembalaan yaitu sebesar 1737,28 g m-2, 892,80 g m-2 untuk produksi bahan kering dan produksi terendah adalah 246,27 g m-2 , 88,20 g m-2 untuk produksi bahan kering. produksi bahan kering di lahan rawa. Hasil analisis komposisi botani pada tutupan lahan yang berbeda didominasi oleh rumput dengan proporsi 79,5% dengan nilai Summed Dominance Ratio (SDR) semua lahan menjadi rumput 62,5%, legum 6,5%, gulma 30,9%. Kapasitas tutupan lahan di UP3J tergolong produktif, kecuali lahan rawa karena lahan didominasi oleh tanaman yang tidak dapat dikonsumsi oleh ternak., This study aimed to research the potentialand and carring capacity of lcover crap in UP3J, Bogor, West Java .The method used in this study is the survey method and direct measurement and observation in the field. Measurement of forage production was carried out using a quadrant measuring 0,5 m x 0,5 m. The results showed that the highest production of dry and fresh forage material was found in the milling field , which amounted to 1737,28 g m-2 , 892,80 g m-2 for dry material production and the lowest production was 246,27 g m-2, 88.20 g m-2 for production of dry matter in swamp land. The results of the analysis of the Botanical composition of different land cover determined by the proportion of grass 79.5% with the value of the Summed Dominance Ratio (SDR) of all land into grass 62,5%, legumes 6,5%, weeds 30,9%. The carring capacity of cover land in UP3J is classified as productive, except for swamp land because the land is dominated by crops that cannot be consumed by livestock.
Keyword: botanical composition, carrying capacity, dry matter, fresh forage production

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