Judul: Evaluasi koro benguk (Mucuna pruprirens) sebagai tanaman revegetasi pasca penambangan batubara Kalimantan Timur
Abstrak: Salah satu faktor yang menyebabkan keberhasilan reklamasi lahan pasca penambangan batubara adalah pemilihan jenis vegetasi yang tepat sehingga efektif dan efisien sesuai dengan kondisi ekologi setempat dalam memperbaiki kualitas tanah pasca penambangan. Tanaman Koro Benguk (Mucuna pruprirens) merupakan tanaman cover crop yang dapat tumbuh dilahan bekas penambangan batubara. Tanaman ini dapat menaikan pH tanah, meningkatkan ketersediaan N dalam tanah dan sebagai tanaman konservasi yang dapat mengurangi erosi tanah. Penanaman koro benguk yang dilakukan pada disposal C1 (baru direklamasi) dan Disposal P ( baru lima 5 tahun direklamasi) bertujuan untuk mengevaluasi pertumbuhan, tanaman Koro Benguk (Mucuna pruprirens), serapan hara dan membandingkan sifat-sifat kimia (pH, KTK, C-Organik) pada kedua disposal tersebut. Penelitian menggunakan analisis secara deskriptif dengan membandingkan data setiap parameter antar perlakuan pada kedua disposal tersebut dengan 6 perlakuan yaitu Kontrol, Kompos NPK 50kg/ha dan TSP 25kg/ha, Pupuk Kandang NPK 50kg/ha dan TSP 25kg/ha, Kapur 100kg/ha pupuk NPK 50kg, TSP 25kg, kapur 150kg/ha NPK 50kg/ha TSP 50kg/ha dan kapur 200kg/ha NPK 50kg/ha TSP 50kg/ha, sebanyak 3 kali ulangan. Penelitian ini dilakukan di areal pasca penambangan Site Binungan operation PT Berau Coal Kalimantan Timur. Untuk analisis tanah dilakukan di Laboratorium Kimia Tanah Universitas Mulawarman dan Laboratorium Kesuburan Tanah Insitut Pertanian Bogor.
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Judul: The Effect of Humic Substance, Organic Matter, and Lime Ameliorant Application on the Growing of Koro Benguk (Mucuna pruriens) in Ex-Coal Mining Batulicin Mine South Kalimantan
Abstrak: One of the efforts to support the succesfully of ex-coal mining reclamation is improving land quality and choosing oppropiate plants. The application of humic substance to replace organic matter function is still limited. Koro Benguk (Mucuna pruriens) is one of a land cover crops which usually used on ex-coal mining. This plant is tolerant on acid soil, fast growing, high biomass, decomposed easily, and has a function as conservation plant which can reduce erosion. This research was aimed to study the effect of amelioran humic substances, organic matter, and lime ameliorant application on the growing of Koro Benguk and soil physical-chemical properties in ex-coal mining PT. Arutmin Indonesia, Batulicin Mine, South Kalimantan. Research has been done experimentally using descriptive analysis. This research consist of 9 treatments as follows: humic substances with dosage 2.5 l/ha; 5 l/ha; 7.5 l/ha; liming with dosage 3.45 ton/ha (50% Al-dd ); 6.9 ton/ha (100% Al-dd); lime with dosage 3.45 ton/ha (50% Al-dd) + humic substances 5 l/ha; lime with dosage 6.9 ton/ha (lime 100% Al-dd) + humic substances 5 l/ha dosage; organic fertilizer 100 ton/ha and control. All this treatments were repeated three times. The parameters which were used in this research are fresh weight and dry weight pf Koro Benguk 3.5 month after planting. Soil analysis was conducted in laboratory of Physical Land Resources Development and laboratory of Soil Physics and Conservation, Bogor Agricultural University. The results showed that application of humic substances gave the significanly increase of Koro Benguk plant biomass substantially 48.53 kg fresh weight and 11.81 kg dry weight, but was not significantly different on physicschemical properties. Liming application gave an effect on pH increased from 4.21 to 5.40 and decreasing Al from 10.17 me/100g to 0.29 me/100g. Organic fertilizer increasing C-organic from 0.16% to 0.96% and Cation Exchange Capacity (CEC) from 7.67 me/100g to 10.27 me/100g. Organic matter treatment decrease bulk density from 1.46 g/cm3 to 1.19 g/cm3.
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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