Judul: Emisi Karbondioksida (CO2) Per Kapita dan Skema Mitigasi Berbasis Pohon di Kabupaten Klaten, Jawa Tengah
Abstrak: Gas rumah kaca yang terdiri atas gas karbon dioksida (CO2), gas metana (CH4) dan gas dinitro oksida (N2O) memiliki kemampuan untuk menyerap dan memancarkan panas. Aktivitas manusia menyebabkan peningkatan konsentrasi gas rumah kaca di atmosfer sehingga terjadi peningkatan suhu bumi. Tujuan penelitian adalah menghitung emisi CO2 per kapita penduduk Kabupaten Klaten serta membuat skenario mitigasi emisi CO2 per kapita penduduk Kabupaten Klaten. Hasil penelitian menunjukan emisi CO2 per kapita yang dihasilkan dari sektor transportasi, listrik, gas, dan sampah sebesar 1.7567 ton CO2/kapita/tahun. Alternatif skenario yang perlu dilakukan oleh setiap individu di Kabupaten Klaten adalah dengan melakukan penanaman pohon yang mampu menyerap CO2 di atmosfer sebesar 1 856.53 kg/tahun. Jenis pohon yang dipilih adalah krey payung (Fellicium decipiens), kenanga (Canangium odoratum), mangga (Mangifera indica) dan jambu (Psidium guajava). Alternatif lain yang dapat dipilih berupa carbon credit sebesar Rp 235 397.8 /tahun/individu sampai dengan Rp 541 414.94 /tahun/individu.
Keyword: CO2, emisi per kapita, Kabupaten Klaten, mitigasi

Judul: Emisi CO2 per Kapita dari Aktivitas Antropogenik dan Skema Mitigasi Berbasis Hutan di Kota Bekasi, Jawa Barat.
Abstrak: Aktivitas manusia dari sektor transportasi, listrik, gas, dan limbah mengakibatkan bertambahnya gas rumah kaca. Tujuan penelitian ini untuk mengetahui jumlah emisi CO2 per kapita dan mengetahui upaya alternatif mitigasi yang dapat dilakukan. Berdasarkan hasil analisis, diperoleh nilai emisi CO2 per kapita yang dihasilkan dari sektor transportasi, pemakaian listrik, gas,dan sampah sebesar 2.9859 ton CO2/kapita/tahun. Social Cost of Carbon yang dihasilkan akibat emisi sebesar Rp 920 255/kapita/tahun. Upaya mitigasi dapat dilakukan dengan penanaman, perubahan gaya hidup, dan kredit karbon. Setiap individu memerlukan 8 pohon yang dapat menyerap 3.10401 ton CO2/tahun untuk mengurangi 2.9859 ton CO2 emisi yang dihasilkan. Gaya hidup rendah karbon dapat mengurangi emisi hingga 1.3809 ton CO2. Mitigasi dengan kredit karbon memerlukan biaya Rp 480 261.36 atau dengan pembayaran melalui sistem carbon tax sebesar Rp 374 765/tahun.
Keyword: CO2, emisi per kapita, kredit karbon, mitigasi

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