Judul: Analisis Full Cost Recovery pada Penetapan Tarif Air PERUMDA Tirta Pakuan Kota Bogor
Abstrak: PERUMDA Tirta Pakuan Kota Bogor yang menjalankan tugasnya sebagai suatu badan usaha yang mengelola air minum, setiap tahunnya mengalami kehilangan air rata-rata 30% per tahun. Hal tersebut berimbas pada penetapan tarif, dimana semakin besar angka kehilangan air, maka kemampuan supply air menurun sehingga diperlukan evaluasi penetapan tarif. Pengelolaan sumberdaya air juga harus berkelanjutan agar dapat dimanfaatkan kembali untuk kebutuhan manusia, mengingat pesatnya pertumbuhan penduduk secara tidak langsung terdapat konsekuensi bahwa permintaan air bersih akan semakin bertambah. Penelitian ini bertujuan untuk: (1) mengidentifikasi pola pengelolaan air PERUMDA Tirta Pakuan; dan (2) evaluasi kebijakan penetapan tarif dengan mekanisme full cost recovery. Hasil penelitian menunjukan bahwa sumber air yang digunakan berasal dari empat mata air dan lima instalasi pengelolaan air (IPA) dengan total kapasitas produksi sebanyak 2.667,16 lt/detik, dan dalam waktu satu tahun PERUMDA Tirta Pakuan mendistribusikan air sebanyak 39.617.449 m3 /tahun. Rata-rata tingkat kehilangan air mengalami peningkatan, 29,33% pada tahun 2016, dan 30,70% pada tahun 2018. Hal tersebut sudah berada di bawah standar toleransi angka kebocoran air. Penetapan tarif saat ini belum memenuhi kriteria full cost recovery, terdapat beberapa perbedaan antara tarif saat ini dengan tarif hasil perhitungan menurut Permendagri, tingginya angka kebocoran air berimbas pada tingginya harga dasar.
Keyword: full cost recovery, NRW, water pricing, tariff determination

Judul: Analisis Kebijakan Tarif Air PDAM Tirta Asasta Kota Depok, Jawa Barat
Abstrak: PDAM Tirta Asasta Kota Depok mengalami kesulitan dalam pemulihan biaya dan penerimaan keuntungan akibat tingkat tarif yang terlalu rendah. Kondisi ini menyebabkan perusahaan tidak dapat memenuhi kewajiban yang diamanatkan menurut undang-undang dan mengalami kesulitan dalam perbaikan infrastruktur. Berpasangan dengan tingkat kebocoran air yang mencapai 30%, perubahan tarif air sangat penting dilakukan untuk pengelolaan air yang berkelanjutan. Preferensi konsumen terhadap harga air dilibatkan dalam bentuk willingness to pay (WTP) sebagai bahan pertimbangan dalam menetapkan tarif air. Penetapan tarif air di Indonesia dengan mekanisme full cost recovery diatur dalam peraturan menteri dalam negeri. Tarif dibagi menjadi tiga jenis: tarif rendah, tarif dasar, dan tarif penuh. Tarif air yang telah diperoleh berdasarkan mekanisme full cost recovery adalah Rp 8.941 untuk tarif dasar, Rp 2.012 dan Rp 5.767 untuk tingkat sosial dan rumah sangat sederhana rendah, Rp 8.226 untuk instansi pemerintah, dan Rp 11.401 untuk tingkat penuh. WTP konsumen berada di antara Rp 5.352 dan Rp 7.256 dengan nilai median Rp 6.304.
Keyword: full cost recovery, tarif, willingness to pay

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