Judul: Evaluasi pengelolaan limbah padat domestik sebagai usaha memperbaiki sanitasi lingkungan perdesaan (studi kasus: Desa Babakan, Kecamatan Darmaga, Kabupaten Bogor)
Abstrak: Tujuan dari penelitian yang dilakukan yaitu untuk mengetahui massa dan timbulan limbah padat yang dihasilkan tiap harinya, menganalisis komposisi dan karakteristik limbah padat baik secara fisika maupun kimia, mengevaluasi sistem pewadahan, pengumpulan, sistem pengangkutan dan kondisi TPS. Selain itu, mengamati aktivitas daur ulang limbah padat yang melibatkan unsur masyarakat, petugas kebersihan dan pemulung serta dapat memberi masukan bagi sistem manajemen limbah padat untuk memperbaiki masalah sanitasi lingkungan. Metode penelitian yang dilakukan meliputi pengukuran langsung timbulan limbah padat terhadap 132 Kepala Keluarga (KK) selama 8 hari berturut-turut berdasarkan SNI 19-3694-1994 tentang Metode Pengambilan dan Pengukuran Contoh Timbulan dan Komposisi Sampah Perkotaan. Untuk analisis karakteristik limbah padat menggunakan berbagai metode, diantaranya Metode AOAC untuk analisis kadar air, kadar abu dan kadar volatil, Metode Walkley-Black untuk analisis nilai karbon (C), Metode Nitrogen Kjeldahl untuk analisis nitrogen (N), dan Metode Oxygen Bomb Calorimeter untuk analisis nilai kalor. Untuk aktivitas daur ulang limbah dan peranserta masyarakat dilakukan dengan metode wawancara serta kuisioner. Berdasarkan hasil pengukuran terhadap timbulan limbah padat yang dilakukan selama 8 hari berturut-turut, diperoleh jumlah timbulan limbah padat yang dihasilkan rata-rata tiap harinya yaitu sebesar 0,184 kg/orang/hari. Komposisi limbah padat yang terukur terdiri dari sisa makanan, plastik, kertas, kayu, kain, karet, gelas dan logam. Jumlah yang diperoleh dari komposisi limbah padat yang terukur adalah sebagai berikut sisa makanan 64,05%, plastik 21,06%, kertas 13,27%, kain 0,49%, kayu 0,44%, gelas 0,40%, logam 0,29% dan karet 0,00%, karena jumlah karet yang paling sedikit. Karakteristik limbah padat yang dianalisis dalam penelitian ini, diantaranya kadar air, kadar abu, kadar volatil, rasio C/N dan nilai kalor. Hasil yang diperoleh untuk analisis karakteristik limbah padat, diantaranya kadar air 77,94%, kadar abu 2,74%, kadar volatil 19,36%, rasio C/N 39:1 dan nilai kalor 3997,598 kalori/gram.
Keyword: Solid waste, Waste management

Judul: Design of TPS 3R in Bulumanis Kidul Village, Margoyoso District, Pati Regency
Abstrak: Permasalahan persampahan terjadi pada Desa Bulumanis Kidul sehingga pemerintah desa mengadakan pengelolaan sampah, tetapi masih belum berjalan dengan efektif. Penelitian ini bertujuan merencanakan sistem pengelolaan sampah dari sumber hingga TPS 3R. Penelitian menggunakan metode kuantitatif. Hasil pengukuran timbulan sampah sebesar 2,25 L/jiwa.hari dengan komposisi berdasarkan massa meliputi sampah organik sebesar 55,49%, kertas 9,77 %, plastik 19,50%, botol plastik 4,20%, kain 0,87%, kayu 2,42%, kaca 0,9%, diaper 5,50%, logam 0,6% dan lain-lain 0,75%. Pewadahan sampah direncanakan individual dengan dibagi dua yaitu organik dan anorganik. Wadah sampah perumahan memiliki volume sebesar 30 L, musala 20 L, masjid 40 L, kantor 40 L dan sekolah dibagi menjadi empat dengan masing-masing 30 L. Pengumpulan sampah digunakan sistem individual tidak langsung dengan periodisasi tiga hari sekali dan ritasi 3 kali/hari. TPS 3R direncanakan memiliki ruang pemilahan, penampungan sampah anorganik, pencacahan, pengolahan sampah organik, kontainer residu, ruang pengelola, dan toilet dengan rencana anggaran biaya Rp433.775.651,00., The problem of solid waste occurs in Bulumanis Kidul Village so that the village government organizes waste management, but it is still not running effectively. This study aims to plan a waste management system from source to TPS 3R. The research uses quantitative methods. The results of the measurement of waste generation are 2,25 L/person.day with a composition based on mass including 55,49% organic waste, 9,77% paper, 19,50% plastic, 4,20% plastic bottles, 0,87% cloth, wood 2,42%, glass 0,89%, diaper 5,50%, metal 0,6% and others 0,75%. The waste container is planned individually and divided into two, namely organic and inorganic. Residential waste containers have a volume of 30 L, prayer rooms 20 L, mosques 40 L, offices 40 L and schools are divided into four with 30 L each. Waste collection is used an indirect individual system with a periodization of once every three days and recitation 3 times/day. TPS 3R is planned to have a sorting room, storage of inorganic waste, enumeration, processing of organic waste, residue containers, management room, and toilets with a planned budget of 433.775.651,00 IDR.
Keyword: waste composition, waste management, waste generation

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