Judul: Analisis Daya Dukung Lingkungan Desa Sekaran, Kabupaten Bojonegoro, Jawa Timur
Abstrak: Daya dukung lingkungan adalah kemampuan lingkungan untuk mendukung perikehidupan manusia dan makhluk hidup lain. Penelitian ini bertujuan untuk menganalisis daya dukung lingkungan di Desa Sekaran, Kabupaten Bojonegoro, yang dilakukan dari April-Agustus 2019. Desa Sekaran yang luasnya 1,728.63 ha memiliki penduduk sebanyak 4,198 jiwa dan diperkirakan membutuhkan air sebesar 6,716,800 m3/th. Dari hasil analisis curah hujan berdasarkan Peraturan Kementrian Lingkungan Hidup No. 17 tahun 2009 didapatkan bahwa ketersediaan air di Desa Sekaran sebesar 9,959,285.65 m3/th. Dengan demikian berdasarkan hasil analisis maka status daya dukung lingkungan Desa Sekaran tergolong surplus. Berdasarkan metode daya dukung lingkungan berdasarkan neraca air, ketersediaan air air untuk Desa Sekaran sebesar 30,730,431.7 m3/th dan kebutuhan air 6,716,800 m3/th. Dari rasio jumlah kebutuhan air dan ketersediaan air tersebut didapatkan rasio supply demand sebesar 4.6 yang berarti daya dukung lingkungan Desa Sekaran aman (sustain).
Keyword: daya dukung lingkungan, kebutuhan air, ketersediaan air

Judul: Analisis Daya Dukung Lingkungan di Kecamatan Ciawi, Kabupaten Bogor.
Abstrak: Pertambahan jumlah penduduk di perkotaan akan selalu meningkatkan kebutuhan lahan untuk pemukiman. Penelitian ini bertujuan untuk menganalisis daya dukung lingkungan di Kecamatan Ciawi. Penentuan daya dukung lingkungan hidup dilakukan dengan cara menganalisis kapasitas lingkungan alam dan sumberdaya untuk mendukung kegiatan dan kelangsungan hidup manusia/penduduk. Penelitian ini dilaksanakan dari Maret hingga Agustus 2020 di Kecamatan Ciawi, Kabupaten Bogor. Penelitian analisis daya dukung lingkungan ini mengacu pada peraturan yang berlaku. Daya dukung lingkungan berdasarkan nilai kebutuhan dan ketersediaan air di Kecamatan Ciawi pada tahun 2019 berstatus surplus, sedangkan berdasarkan nilai kebutuhan dan ketersediaan lahan di Kecamatan Ciawi berstatus defisit/terlampaui. Prediksi status daya dukung lingkungan berdasarkan nilai kebutuhan dan ketersediaan air di Kecamatan Ciawi pada tahun 2036 berstatus surplus, sedangkan berdasarkan nilai kebutuhan dan ketersediaan lahan berstatus defisit/terlampaui. Diperlukan beberapa skenario untuk mengatasi permasalahan terkait ketersediaan dan kebutuhan lahan ini.
Keyword: air, kebutuhan, ketersediaan, lahan, penduduk

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