Judul: Estimasi Non Use Value dan Analisis Stakeholder Ruang Terbuka Hijau, Taman Sempur, Kota Bogor.
Abstrak: Pembangunan yang terjadi di Kota Bogor memberikan pertumbuhan dari segi ekonomi, namun cenderung menurun dari segi ekologi. Ruang Terbuka Hijau (RTH) berupa taman kota merupakan salah satu upaya untuk memperbaiki kualitas lingkungan Kota Bogor yang semakin menurun. Keberadaan taman kota memiliki fungsi yang beragam seperti fungsi sebagai daerah resapan air, penyerap karbon, penghasil oksigen, sarana rekreasi, dan sarana berolahraga. Tujuan dari penelitian ini adalah untuk mengidentifikasi persepsi pengunjung terhadap keberadaan Taman Sempur, mengestimasi nilai Willingness to Pay (WTP) pengunjung terhadap upaya menjaga keberadaan Taman Sempur, mengidentifikasi faktor-faktor apa saja yang mempengaruhi besarnya nilai WTP pengunjung, serta untuk mengetahui stakeholder mana yang memiliki peran dan pengaruh yang tinggi dalam kegiatan pengelolaan dan pemanfaatan Taman Sempur. Metode penelitian yang digunakan adalah analisis deskriptif, Contingent Valuation Method (CVM), analisis regresi linear berganda dan analisis stakeholder. Berdasarkan hasil penelitian fungsi yang paling dirasakan dari keberadaan Taman Sempur adalah fungsi sosial budaya (41%), fungsi ekologis (39%), dan fungsi estetika (20%). Kegiatan yang paling diminati pada saat di taman adalah berolahraga dan menikmati keindahan taman. Hasil total WTP dengan menggunakan Contingent Valuation Method (CVM) dari 90 responden yang bersedia berpartisipasi adalah sebesar Rp 325.000 per orang per kunjungan atau Rp 908.093.333 per tahun. Stakeholder yang memiliki tingkat kepentingan dan pengaruh yang tinggi dalam kegiatan pengelolaan dan pemanfaatan Taman Sempur adalah Dinas Perumahan dan Pemukiman (bagian pertamanan) Kota Bogor, Badan Perencanaan Pembangunan Daerah (Bappeda) Kota Bogor, dan Dinas Lingkungan Hidup dan Kebersihan Kota Bogor.
Keyword: Contingent Valuation Method, ruang terbuka hijau, RTH, taman kota

Judul: Penilaian Ekonomi Jasa Lingkungan dan Strategi Pengembangan Ruang Terbuka Hijau (Studi Kasus: Taman Sempur, Kota Bogor)
Abstrak: Global warming is marked by an increase in the average temperature of the atmosphere, sea and land on earth, causing environmental damage that interferes with human needs. Based on goal 11 of sustainable development (Suistanable Development Goals/SDGs), namely sustainable cities and settlements, in an effort to achieve the target of goal 11, the concept of eco-city is carried out because these areas have a high influence from global warming due to human activities so that the proportion of land become less and there is an environmental imbalance. Green Open Space as an eco-city has a function as a public space and can be a place for social interaction, creating creativity, and producing oxygen. Based on these objectives, the existence of Green Open Spaces can maintain environmental balance and be the first step to achieving the SDGs goals so that the objectives of this study are 1) Identifying public perceptions of Sempur Park, 2) Estimating the community's Willingness to Pay for Sempur Park, 3) Analyzing development strategies Perfect Park. The method used in this study is quantitative description analysis using a Likert scale, Contingent Valuation Method (CVM), and Analytical Hierarchy Process (AHP). The results show that the public's perception of Sempur Park is very good with a total willingness to pay for maintenance of IDR 755,036,436 and the main strategy is land availability., Pemanasan global ditandai dengan meningkatnya temperatur rata-rata atmosfer, laut, dan daratan bumi sehingga menyebabkan terjadinya kerusakan lingkungan yang mengganggu kebutuhan manusia. Berdasarkan tujuan 11 dari pembangunan berkelanjutan (Suistanable Development Goals/SDGs) yaitu kota dan pemukiman yang berkelanjutan maka upaya mencapai target dari tujuan 11 dilakukan konsep eco-city karena kawasan tersebut memiliki pengaruh tinggi dari pemanasan global akibat aktivitas manusia sehingga proporsi lahan menjadi sedikit dan terjadi ketidakseimbangan lingkungan. Ruang Terbuka Hijau sebagai eco-city memiliki fungsi sebagai ruang publik dan dapat menjadi wadah interaksi sosial, menciptakan kreativitas, dan produsen oksigen. Berdasarkan tujuan tersebut dengan adanya Ruang Terbuka Hijau dapat menjaga keseimbangan lingkungan dan menjadi langkah awal untuk mencapai tujuan SDGs sehingga tujuan penelitian ini adalah 1) Mengidentifikasi persepsi masyarakat terhadap Taman Sempur, 2) Mengestimasi Willingness to Pay masyarakat terhadap Taman Sempur, 3) Menganalisis strategi pengembangan Taman Sempur. Metode yang digunakan dalam penelitian ini adalah analisis deskripsi kuantitatif dengan skala likert, Contingent Valuation Method (CVM), dan Analytical Hierarchy Process (AHP). Hasil menunjukkan persepsi masyarakat terhadap Taman Sempur sangat baik dengan nilai total kesediaan membayar untuk pemeliharaan sebesar Rp755.036.436 dan strategi pengembangan utama yaitu ketersediaan lahan.
Keyword: Multiple linear regression analysis, Analytical Hierarchy Process, Contingent Valuation Method (CVM), Green Open Space, Likert Scale

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