Judul: Angka Kejadian Infeksi Saluran Pernapasan Akut (Pneumonia) pada Balita Akibat Pengaruh Iklim dan Kualitas Udara di Kota Bogor
Abstrak: Pneumonia merupakan salah satu penyakit infeksi saluran pernapasan yang disebabkan oleh virus, bakteri, dan mikroorganisme lainnya sebagai faktor utama, dan faktor lingkungan seperti iklim dan kualitas udara sebagai faktor pendorong. Kota Bogor memiliki kepadatan lalu lintas dan curah hujan yang tinggi, sehingga berpotensi terpapar pencemar udara dan kelembaban yang tinggi. Penelitian ini bertujuan untuk menganalisis faktor-faktor yang dapat mempengaruhi angka kejadian Pneumonia pada balita di Kota Bogor. Hubungan antara angka kejadian Pneumonia dengan faktor iklim dan particulate matter (PM) dianalisis menggunakan analisis korelasi, analisis komponen utama (PCA), dan grafik. Curah hujan dan kelembaban udara yang tinggi saat musim hujan dapat mengurangi konsentrasi PM di udara bebas, tetapi meningkatkan peluang berkembangnya mikroorganisme di dalam ruangan, sehingga kejadian Pneumonia pada balita meningkat, terutama pada peralihan musim hujan ke kemarau. Konsentrasi PM yang tinggi di udara bebas saat musim kemarau juga dapat meningkatkan kejadian Pneumonia. Hasil PCA menunjukkan bahwa kejadian Pneumonia di Kota Bogor didominasi oleh kondisi lembab. Kejadian Pneumonia di Kota Bogor tinggi saat kelembaban udara tinggi dan konsentrasi PM2.5 terukur rendah. Pengaruh PM2.5 terukur terhadap Pneumonia lebih dominan terjadi saat pergantian musim dari musim kemarau ke musim hujan yaitu pada bulan SON.
Keyword: balita, iklim, particulate matter, pneumonia

Judul: Characteristics of Under-Five  Pneumonia Cases Based on Rain Events in Bogor City
Abstrak: Penularan pneumonia balita salah satunya dipengaruhi oleh kondisi iklim, termasuk hujan. Kejadian hujan akan mempengaruhi sistem pernapasan dengan menurunkan resistensi tubuh balita terhadap infeksi. Kota Bogor memiliki curah dan hari hujan tinggi sehingga berpotensi menjadi tempat penyebaran mikroorganisme penyebab pneumonia. Penelitian ini bertujuan mendapatkan gambaran karakteristik kasus pneumonia balita berdasarkan kejadian hujan yang diidentifikasi dari curah hujan, klasifikasi hujan harian, dry spell dan wet spell di Kota Bogor. Hasil analisis korelasi menunjukkan hanya hari tidak hujan, hari hujan, hari hujan ringan, dry spell dan wet spell memiliki pengaruh nyata dengan korelasi lemah terhadap kasus pneumonia balita. Di Kota Bogor, periode dry spell yang panjang hingga 7 hari per minggu diikuti penurunan kasus pneumonia balita, sedangkan periode wet spell yang panjang hingga 7 hari per minggu diikuti peningkatan kasus pneumonia balita 1 hingga 2 minggu kemudian. Koefisien korelasi tertinggi terdapat saat jeda waktu 1 minggu yang disebabkan masa inkubasi patogen dan penundaan untuk konsultasi medis. Berdasarkan analisis regresi, hari hujan hanya menjelaskan 13% variasi kasus pneumonia balita, sedangkan dry spell dan wet spell hanya menjelaskan 14%. Analisis 3D surface plot menunjukkan peningkatan kasus pneumonia balita seiring dengan meningkatnya frekuensi hari hujan dan wet spell, baik tanpa jeda maupun jeda 1 hingga 2 minggu., The transmission of pneumonia among children under-five is influenced by climatic conditions, including rain. Rain events will affect the respiratory system by reducing under-five resistance to infection. Bogor City has high rainfall and rainy days, potentially spreading microorganisms that cause pneumonia. This study aimed to describe the characteristics of under-five pneumonia cases based on rain events identified from rainfall, daily rain classification, dry spell and wet spell in Bogor City. The results of the correlation analysis showed only non-rainy days, rainy days, light rainy days, dry spells and wet spells had a significant influence a weak correlation on under-five pneumonia cases. In Bogor City, long dry spell periods of up to 7 days per week were followed by a decrease in under-five pneumonia cases, while long wet spell of up to 7 days per week were followed by an increase in under-five pneumonia cases 1 to 2 weeks later. The highest correlation coefficient was found during the 1-week lag due to the incubation period of pathogens and delays for medical consultation. Based on regression analysis, rainy days only explained 13% of the variation in under-five pneumonia cases, while dry and wet spells only explained 14%. 3D surface plot analysis showed an increase in under-five pneumonia cases as the frequency of rainy days and wet spells increased, both without a lag and with a lag of 1 to 2 weeks.
Keyword: curah hujan, dry spell, hari hujan, pneumonia, wet spell

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