Judul: Analisis Spasio-Temporal Tingkat Pencemaran Danau Ebony dan Danau Crown Golf, Pantai Indah Kapuk, Jakarta Utara
Abstrak: Saluran pembuangan dari rumah tangga yang masuk ke danau berpotensi menyebabkan pencemaran di Danau Ebony dan Crown Golf meningkat. Penumpukan bahan organik secara terus-menerus di danau dapat menyebabkan pencemaran. Penelitian ini bertujuan menganalisis secara spasio-temporal tingkat pencemaran perairan di Danau Ebony dan Danau Crown Golf, Pantai Indah Kapuk, Jakarta Utara. Analisis data terdiri dari dinamika parameter kualitas air, tingkat pencemaran, statistik multivariat, dan pemetaan tingkat pencemaran. Tingkat pencemaran dianalisis menggunakan Indeks Pencemaran (IP). Pemetaan tingkat pencemaran dianalisis menggunakan perangkat lunak ArcGIS 10.2.2. Hasil penelitian menunjukkan ada lima parameter kualitas air yang tidak sesuai dengan baku mutu Kelas II pada PPRI No. 82 Tahun 2001. Parameter tersebut adalah BOD, COD, nitrit, fosfat total, dan hidrogen sulfida. Tingkat pencemaran berdasarkan IP menunjukkan kondisi perairan yang cemar ringan hingga sedang. Secara spasial, tingkat pencemaran tinggi pada lokasi yang terdapat banyak masukan dari saluran pembuangan rumah tangga. Secara temporal, tidak terdapat perbedaan yang nyata antara tingkat pencemaran di musim hujan dan kemarau.
Keyword: kualitas air, pencemaran, pengelolaan, saluran rumah tangga

Judul: Fluktuasi Kualitas Air dan Tingkat Pencemaran Danau Ebony, Pantai Indah Kapuk, Jakarta Utara.
Abstrak: Danau Ebony merupakan perairan yang dibuat mengelilingi kawasan perumahan (cluster Ebony) dengan fungsi yaitu sebagai pengatur hidrodinamika dan pengendali banjir serta bagian dari landscape yang menjadi daya tarik keindahan perumahan. Letak dan fungsi Danau Ebony menyebabkan perairan banyak menerima limpasan air yang dapat mempengaruhi kualitas air dan menyebabkan pencemaran. Tujuan dari penelitian ini adalah untuk menganalisis fluktuasi kualitas air dan tingkat pencemaran Danau Ebony. Contoh air pada penelitian ini diambil berdasarkan hasil pemantauan setiap bulan dari bulan Juli 2015 hingga Juni 2016 dan dilakukan pada lima stasiun. Hasil penelitian menunjukkan bahwa terdapat 8 parameter kualitas air yang melewati baku mutu dan menyebabkan tingginya tingkat pencemaran Danau Ebony, yaitu TSS, DO, BOD5, COD, nitrit, amonia total, fosfat total, dan hidrogen sulfida. Tingkat pencemaran Danau Ebony hasil analisis Indeks Pencemaran menunjukkan status perairan tercemar sedang dan hasil analisis Indeks Kualitas Air CCME menunjukkan status perairan sangat buruk.
Keyword: Danau Ebony, fluktuasi, kualitas air, musim, pencemaran air

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