Judul: Analisis Kesediaan dan Faktor-Faktor yang Memengaruhi Masyarakat untuk Kontribusi dalam Perbaikan Kualitas Air (Studi Kasus: Pelanggan PDAM Kelurahan Kayuringin Jaya, Kota Bekasi)
Abstrak: Salah satu sumber bahan baku air PDAM Kota Bekasi adalah air Sungai Bekasi. Aktivitas industri yang masif serta masih banyaknya industri yang membuang limbahnya ke Sungai Bekasi menyebabkan sumber bahan baku air PDAM Kota Bekasi menjadi tercemar. Tujuan dari penelitian ini adalah (1) mengidentifikasi sistem instalasi pengolahan air (IPA) PDAM Kota Bekasi, (2) mengidentifikasi pengaruh pandemi Covid-19 terhadap kualitas air PDAM Kota Bekasi, (3) mengestimasi nilai kerugian ekonomi masyarakat sebelum dan saat pandemi Covid-19, (4) mengestimasi nilai kesediaan masyarakat untuk kontribusi dalam perbaikan kualitas air. Metode analisis yang digunakan adalah analisis deskriptif, Skala Likert, Replacement Cost, Preventive Expenditure, Dichotomous Choice Contingent Valuation Method (DC-CVM), serta Metode Turnbull. Berdasarkan hasil penelitian, sistem IPA PDAM masih melakukan pengaturan sistem secara manual. Adaptasi teknologi masih sulit dilakukan karena keterbatasan anggaran. Persepsi masyarakat menunjukkan bahwa kualitas air PDAM tidak baik, baik pada sebelum maupun saat pandemi Covid-19. Estimasi nilai kerugian ekonomi masyarakat akibat penurunan kualitas air adalah sebesar Rp 243.095.255 terdiri atas biaya pengganti 84 persen dan biaya pencegahan 16 persen. Nilai kesediaan membayar masyarakat untuk perbaikan kualitas air adalah sebesar Rp 7.500 per m3 dan faktor-faktor yang memengaruhinya adalah nilai bid dan status tempat tinggal.
Keyword: DC-CVM, WTP, Sistem IPA, analisis regresi logistik, metode Turnbull

Judul: Analisis ekonomi pengelolaan sumberdaya air pada instalasi pengolahan air di PDAM Bekasi
Abstrak: Air merupakan sumberdaya alam yang mutlak diperlukan bagi kehidupan manusia, termasuk kehidupan dan kesinambungan rantai pangan makhluk hidup. Kota Bekasi terletak di bagian utara Propinsi Jawa Barat memiliki permasalahan dalam penyediaan sumber daya air. Kota Bekasi juga dikenal sebagai kota industri, akibat banyaknya aktivitas dari industri-industri sekitarnya. Penelitian ini memiliki empat tujuan yaitu : (1) Mengidentifikasi pengelolaan sumberdaya air berdasarkan instalasi oleh PDAM Bekasi, (2) Mengidentifikasi faktor-faktor yang mempengaruhi tingkat produksi air bersih di PDAM Bekasi, (3) Mengestimasi fungsi dan biaya produksi terhadap jenis instalasi pengolahan air sesuai level kapasitas produksi (4) mengestimasi harga pokok air bersih Penelitian ini dilaksanakan di PDAM Bekasi. Data yang dibutuhkan data sekunder dan data primer. Analisis deskriptif untuk analisis pengelolaan Sumber Daya Air (SDA), analisis regresi linier berganda untuk melihat faktor-faktor yang mempengaruhi produksi air dan fungsi biaya produksi air terhadap Instalasi Pengolahan Air (IPA), dan untuk mengevaluasi harga pokok air bersih PDAM Bekasi dengan marginal cost pricing.
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