Judul: Mathematical Model of Dengue Hemorrhagic Fever with Aedes albopictus Mosquitos as Vector
Abstrak: Dengue Hemorrhagic Fever (DHF) is an acute febrile illness caused by a dengue virus. This virus has four serotypes, i.e. Dengue I - IV. The dengue virus is transmitted by various species of Aedes mosquitoes. Mathematical model can be used to study the spread of the disease. The mathematical model discussed in this paper is SEIR model. The main vector of the disease is mosquito of the Aedes albopictus type. In the SEIR model, an analysis is performed to assess the stability of the equilibrium point and numerical simulations. There are two equilibrium points obtained. The first equilibrium point is a disease-free equilibrium (DFE), which is stable, given the basic reproductive number ℜ < 1. The second equilibrium point is called an endemic point, which stability is guaranteed if the value ℜ > 1. The numerical simulations show that increasing mosquitoes mortality rate makes the number of exposed susceptible humans decrease. Furthermore, increase in the average bite of infected mosquito will increase the number of exposed susceptible humans. For the mosquito population, increasing mosquitoes mortality rate will decrease the number of exposed susceptible mosquitoes. Finally, increase in the average bite of infected mosquito will increase the number of exposed susceptible mosquitoes.
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Judul: Model Matematika Penyebaran Penyakit Demam Berdarah Dengue
Abstrak: Dengue disease was transmitted to human through infected mosquito Aedes Aegypti. It was found widely in the tropical regions of the world. Infection of dengue virus could be grouped into two mechanisms. The first mechanism was vertical transmission in mosquito body, where virus could be transmitted by female mosquito into her eggs. The second mechanism was transmission from mosquito into human body and conversely. In this study, mathematical models were used to study the behavior of the transmission of dengue disease. The mathematical model of the disease with assumption of healthy mosquito eggs was compared to the modified mathematical model of dengue disease assuming that some of mosquito eggs were infected by dengue virus. The seasonal influence, especially temperature, was considered in the analysis. The standard dynamical analysis was applied to both mathematical models. Numerical results showed that infected mosquito eggs influenced the spreading of dengue disease. There were bigger oscillation in the susceptible and infected human population, as well as in the infected mosquito, as a result of stronger seasonal influence during extrinsic incubation.
Keyword: Dengue disease, Mathematical model, Etrinsic incubation period, DBD, Sistem persamaan diferensial, Titik tetap, Pelinieran, Multi spesies, Kriteria Routh-Hurwitz, Solusi numerik sistem persamaan diferensial, Analisis kestabilan, Simulasi model

Judul: Pengaruh nilai-nilai budaya perusahaan terhadap kepuasan kerja karyawan PT Pupuk Kaltim (Kantor Perwakilan Jakarta)
Abstrak: Budaya perusahaan merupakan salah satu faktor yang berpengaruh terhadap kepuasan karyawan. PT Pupuk Kalimantan Timur, Tbk merupakan produsen pupuk terbesar di Indonesia yang berpusat di kota Bontang, Kalimantan Timur yang memproduksi pupuk urea, ammoniak dan NPK. PT Pupuk Kaltim menerjemahkan apa yang diinginkan perusahaan kedalam lima nilai budaya perusahaan. Nilai-nilai budaya perusahaan ini tentu tidak terlepas dari hal-hal yang berkaitan dengan pemahaman, penerapan dan internalisasi nilai-nilai budaya tersebut oleh karyawan yang akan mempengaruhi perilaku kerja karyawan dan berdampak terhadap kepuasan kerja karyawan. Melalui nilai-nilai tersebut diharapkan menjadi tuntunan bagi karyawan, sehingga dapat memberikan kinerja yang baik terhadap perusahaan dan kepuasan kerja bagi mereka sendiri.Kepuasan kerja karyawan yang tinggi merupakan salah satu indikator juga efektivitas manajemen yang berarti bahwa budaya organisasi telah dikelola dengan baik.
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