Judul: Kondisi tata Air Sub Das Progo Hulu Kabupaten Temanggung Propinsi Jawa Tengah
Abstrak: Penelitian ini bertujuan untuk mengetahui perilaku tata air (fluktuasi debit dan kualitas air) Sub DAS Progo Hulu dan permasalahannya (erosi, sedimentasi, kesesuaian pemanfaatan lahan dengan fungsinya, tekanan penduduk, pendapatan/sumber pendapatan penduduk dan pemahaman terhadap upaya-upaya konservasi tanah dan air), serta sampai sejauh mana upaya-upaya rehabilitasi lahan dan konservasi tanah yang dilakukan untuk mengatasi permasalahan yang ada tersebut. Kesemuanya ini bisa menjadi indikator dari pengelolaan Sub DAS Progo Hulu tersebut.
Keyword: tata air

Judul: The development of tobacco-based sustainable dry land farming system at progo hulu sub-watershed (temanggung regency, Central Java province).
Abstrak: Fenomena kerusakan sumberdaya lahan atau degradasi lahan akibat erosi di daerah hulu DAS di Indonesia terus meningkat. Fenomena ini juga terjadi di Sub-DAS Progo Hulu, yang digunakan untuk usahatani lahan kering berbasis tembakau (UTLKBT). Akibat dari teknik budidaya yang kurang mengindahkan kaidah konservasi tanah dan air, pada kemiringan berbukit dan curam, serta curah hujan yang tinggi pada UTLKBT di Sub-DAS Progo Hulu telah menyebabkan terjadinya : (1) erosi yang parah, dan (2) degradasi lahan. Apabila dibiarkan atau tidak segera diperbaiki agroteknologinya, lahan yang telah mengalami proses degradasi tersebut akan menjadi tambah rusak, dan akhirnya menjadi lahan kritis dan mengancam keberlanjutan sistem UTLKBT di Sub-DAS Progo Hulu. Perencanaan sistem pertanian konservasi (SPK) yang komprehensif sangat diperlukan untuk mewujudkan UTLKBT berkelanjutan di Sub-DAS Progo Hulu. Oleh karena itu penelitian ini bertujuan : (1) mengkaji kondisi biofisik lahan dan karakteristik usahatani lahan kering berbasis tembakau di Sub-DAS Progo hulu; (2) mengkaji pengaruh teknologi konservasi tanah dan air (KTA) spesifik lokasi terhadap limpasan permukaan dan erosi; dan (3) merumuskan perencanaan sistem pertanian konservasi untuk mewujudkan sistem UTLK berkelanjutan berbasis tembakau di Sub-DAS Progo Hulu.
Keyword: 

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