Ferry Iskandar
Kelompok Keilmuan Fisika Material Elektronik, Fakultas Matematika dan Ilmu Pengetahuan Alam, Institut Teknologi Bandung

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The Relationship of Pregnant Mother's Compliance with Antenatal Care with the Event of Preeclampsia in Tanjung Bingkung Puskesmas Rhandyka Rafli; Indah Salsabila; Ferry Iskandar; Debie Anggraini; Dian Ayu Hamama Pitra
Budapest International Research and Critics Institute (BIRCI-Journal): Humanities and Social Sciences Vol 5, No 1 (2022): Budapest International Research and Critics Institute February
Publisher : Budapest International Research and Critics University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/birci.v5i1.4381

Abstract

Preeclampsia is an increase in blood pressure experienced by pregnant women, at gestational age above 20 weeks which is treated with routine antenatal visits, this research was conducted at the Tanjung Bingkung Health Center because there is a behavior of young mothers who are ashamed to admit their pregnancy. The purpose of this study was to determine the relationship between pregnant women's adherence to antenatal care with the incidence of preeclampsia at the Tanjung Bingkung Health Center. This research method includes obstetrics and gynecology, conducted at the Tanjung Bingkung Health Center from September to November 2020. The research design was correlation analytic and case control design. The research target population was 54 samples selected by simple random sampling. Data analysis using SPSS application. So the results of this study explain that the compliance of pregnant women in antenatal care is 67% seen from the age of the highest adherence at the age of 20-35 years (80%) and seen from the parity status the highest is multigravida (68%). The incidence of preeclampsia is 13%, judging by age, the highest incidence occurs at the age of 20-35 years (80%) and from multigravida pregnant women (70%). The relationship between adherence of pregnant women to antenatal care with the incidence of preeclampsia, found p value > 0.05 with the conclusion that there is no relationship between adherence of pregnant women to antenatal care with the incidence of preeclampsia.
Klinostat Tiga Dimensi sebagai Simulator Mikrogravitasi untuk Berbagai Eksperimen Tanpa Bobot Indra W. Fathona; Arif Surachman; Ferry Iskandar; Khairurrijal Khairurrijal
Jurnal Otomasi, Kontrol, dan Instrumentasi Vol 3 No 1 (2011): Jurnal Otomasi, Kontrol, dan Instrumentasi
Publisher : Pusat Teknologi Instrumentasi dan Otomasi (PTIO) Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/joki.2011.3.1.4

Abstract

Abstrak Sebuah klinostat tiga dimensi (3-D) telah dirancang untuk menyediakan sebuah lingkungan dengan gravitasi sangat kecil (mikrogravitasi) bagi berbagai percobaan tanpa bobot. Besarnya gravitasi berhubungan dengan kecepatan sudut dari perputaran klinostat tersebut. Dua buah rangka berbentuk segi empat diputar pada sumbu rotasi y-z dengan menggunakan dua motor DC dan kecepatannya diatur oleh mikrokontroler AT89S52 dengan menggunakan prinsip pulse width modulation (PWM). Alat ini telah diuji selama 8 jam tanpa henti untuk berbagai kecepatan sudut di bawah 17 rpm (rotation per minute). Telah didapatkan bahwa alat ini berfungsi dengan baik.Kata kunci: gaya sentrifugal, kecepatan sudut, klinostat, mikrogravitasi, rotasi.Abstract A three-dimensional (3-D) clinostat has been designed to provide an environment with very small gravity (microgravity) for weightless experiments. The obtained gravity is closely related to the angular speed of the clinostat rotation. Two rectangular frames are rotated by employing two DC motors around the y-z rotation axis and its angular speed is controlled by an AT89S52 microcontroller using the pulse width modulation (PWM) technique. Eight-hour continuous operations have been done for various angular speeds below 17 rpm. It has been found that the clinostat functions well.Keywords:angular velocity, centrifugal force, clinostat, microgravity, rotation.
Optimasi Parameter Pemintalan Elektrik Menggunakan Teknik Algoritma Genetika: Tegangan Listrik dan Jarak Nozzle-Kolektor S Saehana; Ferry Iskandar; Mikrajuddin Abdullah; Khairurrijal Khairurrijal
Jurnal Otomasi, Kontrol, dan Instrumentasi Vol 3 No 1 (2011): Jurnal Otomasi, Kontrol, dan Instrumentasi
Publisher : Pusat Teknologi Instrumentasi dan Otomasi (PTIO) Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/joki.2011.3.1.5

Abstract

AbstrakStudi optimasi dua parameter pemintalan elektrik, yaitu tegangan listrik dan jarak nozzle-kolektor, telah dilakukan dengan teknik algoritma genetika dalam domain [1,60] kV dan [5,25] cm serta jumlah populasi 100 buah, peluang pindah silang (pc) 0,7 dan peluang mutasi (pm) 0,5. Jejari serat seukuran 155 nm diperoleh dari hasil subsitusi nilai optimum tegangan listrik 1,83 kV dan jarak nozzle-kolektor 23,50 cm pada simulasi pemintalan elektrik yang dimodelkan oleh Reneker, dkk. Hasil optimasi ini diharapkan dapat membantu eksperimen di laboratorium. Kata kunci: pemintalan elektrik, algoritma genetika, jejari serat, optimasi. AbstractThe study of optimizing two electrospinning parameters, i.e. electric voltage and nozzle-collector distance, was done by employing a genetic algorithm technique in the domain of [1,60] kV and [5,25] cm, the population of 100, the crossover probability of 0.7, and the mutation probability of 0.5. Fiber radius of 155 nm was obtained from the substitution of optimal values of electric voltage of 1.83 kV and nozzle-collector of 23.50 cm, which are from the simulation of a model made by Reneker, et al. This optimization result could help experiments in obtaining desired fiber radius. Keywords: electrospinning, genetic algorithm, fiber radius, optimization.
Numerical Simulation of Tunneling Current in an Anisotropic Metal-Oxide-Semiconductor Capacitor Fatimah Arofiati Noor; Ferry Iskandar; Mikrajuddin Abdullah; Khairurrijal khairurrijal
Indonesian Journal of Electrical Engineering and Computer Science Vol 10, No 3: July 2012
Publisher : Institute of Advanced Engineering and Science

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Abstract

In this paper, we have developed a model of the tunneling currents through a high-k dielectric stack in MOS capacitors with anisotropic masses. The transmittance was numerically calculated by employing a transfer matrix method and including longitudinal-transverse kinetic energy coupling which is represented by an electron phase velocity in the gate. The transmittance was then applied to calculate tunneling currents in TiN/HfSiOxN/SiO2/p-Si MOS capacitors. The calculated results show that as the gate electron velocity increases, the transmittance decreases and therefore the tunneling current reduces. The tunneling current becomes lower as the effective oxide thickness (EOT) of HfSiOxN layer increases. When the incident electron passed through the barriers in the normal incident to the interface, the electron tunneling process becomes easier. It was also shown that the tunneling current was independent of the substrate orientation. Moreover, the model could be used in designing high speed MOS devices with low tunneling currents. DOI: http://dx.doi.org/10.11591/telkomnika.v10i3.607