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All Journal TELKOMNIKA (Telecommunication Computing Electronics and Control) Jurnal Ilmu Komputer dan Agri-Informatika Jurnal Spektra Komputasi: Jurnal Ilmiah Ilmu Komputer dan Matematika Indonesian Journal of Electrical Engineering and Computer Science Policy Brief Pertanian, Kelautan, dan Biosains Tropika Jurnal Sains Materi Indonesia
Husin Alatas
Department Of Physics, Faculty Of Mathematics And Natural Sciences, IPB University, Bogor, 16680, Indonesia
Agriculture, Biological Sciences & Forestry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics Social Sciences

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UJI STRUKTUR KRISTAL DAN SIFAT LISTRIK FILM Ba0.55Sr0.45TiO3 DENGAN VARIASI PENDADAHAN La2O3 Ramlan, Tantan Taopik; Irzaman, -; Alatas, Husin
Jurnal Spektra Vol 16, No 2 (2015): Spektra: Jurnal Fisika dan Aplikasinya
Publisher : Jurnal Spektra

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

AbstrakTelah dibuat film Ba0.55Sr0.45TiO3 di atas substrat Si (111) tipe-n dengan metode CSD dan spin coating berkecepatan putar 3000 rpm selama 30 detik dalam kelarutan sebesar 1 M. Film BST didadah La2O3 dengan variasi 0%, 1%, 3%, 5% serta di annealing pada suhu 850 oC selama 15 jam dengan laju kenaikan 1.67 oC/menit. Karakterisasi struktur film berupa pengujian XRD. Hasil yang diperoleh memperlihatkan intensitas difraksi tertinggi dimiliki oleh film dengan variasi pendadahan 5% sedangkan intensitas difraksi terendah dimiliki oleh film dengan variasi pendadahan 0%. Pendadahan meningkatkan intensitas difraksi sinar-X pada film. Analisis struktur kristal BST menggunakan metode XRD menunjukkan bahwa struktur kristal BST berbentuk tetragonal. Hasil uji sifat listrik menunjukkan karakteristik film BST termasuk material semikonduktor.Kata kunci: BST, sifat listrik, struktur kristal, annealing, La2O3 AbstractBa0.55Sr0.45TiO3 (BST) thin film, was doped by lantanum oxide (La2O3), has been made with doping variations  0%, 1%, 3%, and 5% above substrat Si (111) n-type by using chemical solution deposition methods by spin coating technique at 3000 rpm for 30 seconds in 1 M concentration and 850 oC annealing temperature at 15 hour with rate 1.7 oC/minute. Structure characterization was using XRD. Result of XRD showed 5% doping has highest diffraction intensity and 0% is the lowest. Diffraction intensity increased by doping on film. Crystal structure analysis showed BST and BFST are tetragonal. Electrical properties showed that BST and BSLT thin film are semiconductor material.Key words : BST, electrical properties, crystal structure, annealing, La2O3
Wireless Sensor Network Design based on Hybrid Tree-Like Mesh Topology as a New Platform for Air Pollution Monitoring System Muhammad Iqbal; Muhammad Fuad; Heru Sukoco; Husin Alatas
TELKOMNIKA (Telecommunication Computing Electronics and Control) Vol 14, No 3: September 2016
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/telkomnika.v14i3.2279

Abstract

In this paper, we propose a new platform for air pollution monitoring system based on wireless sensor network (WSN) with Tree-like Mesh topology. We used ZigBee device and General Packet Radio Service (GPRS) for data transfer protocol. The results of a conducted test showed a good performance in delivering data in real time mode. We found that the fewer hop produced higher throughput but lower delay and packet loss ratio. The system performance demonstrated that the reduction of one hop increased 32.06% of throughput, decreased 23.28% of delay and 0.01% of packet loss ratio.In this paper, we propose a new platform for air pollution monitoring system based on wireless sensor network (WSN) with Tree-like Mesh topology. We used ZigBee device and General Packet Radio Service (GPRS) for data transfer protocol. The results of a conducted test showed a good performance in delivering data in real time mode. We found that the fewer hop produced higher throughput but lower delay and packet loss ratio. The system performance demonstrated that the reduction of one hop increased 32.06% of throughput, decreased 23.28% of delay and 0.01% of packet loss ratio
SIMULASI PERAMBATAN GELOMBANG ELEKTROMAGNETIK PADA KRISTAL FOTONIK 2D MENGGUNAKAN METODE FINITE DIFFERENCE FREQUENCY DOMAIN Adly Maulana Suherman; Teguh Puja Negara; Hendradi Hardhienata; Husin Alatas
KOMPUTASI Vol 16, No 2 (2019): Komputasi: Jurnal Ilmiah Ilmu Komputer dan Matematika
Publisher : Ilmu Komputer, FMIPA, Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (453.567 KB) | DOI: 10.33751/komputasi.v16i2.1619

Abstract

Numerical simulations on two-dimensional photonic crystals with defects were analyzed using the Finite Difference Frequency Domain (FDFD). This approach consists of Maxwell's formulation that uses Central Finite Difference to place fields and materials at discrete points of the Yee grid, so that the matrix wave equation is obtained in the form of column vectors. Absorbent boundary conditions use Perfectly Matched Layer (PML) with fictitious magnetic conductivity to shed incoming waves at the edge of the domain calculation. Photonic crystals can be assumed to be a periodic lattice of dielectric material that produces the phenomenon of photonic band gap (PBG). The results of FDFD simulations are compared with the literature with a difference of 0.056. This small difference value means that this method is good enough to analyze PBG phenomena. For point defects and the accumulation of electromagnetic waves, linear defects are investigated and analyzed with spectral responses. Insertion of defects in photonic crystals will produce a photonic pass band (PPB). The simulation results show that PPB depends on the angle of arrival vector, material permittivity, and width of the defect structure.
Pembangunan Model Jaringan Saraf Tiruan untuk Memprediksi Kecenderungan Tipe Mediasi Orang Tua terhadap Penggunaan Internet oleh Anak Indah Puspita; Karlisa Priandana; Medria Kusuma Dewi Hardhienata; Peter John Morley; Auzi Asfarian; Husin Alatas
Jurnal Ilmu Komputer dan Agri-Informatika Vol 9 No 1 (2022)
Publisher : Departemen Ilmu Komputer, Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jika.9.1.47-57

Abstract

Mediasi orang tua sangat diperlukan agar dampak negatif penggunaan internet oleh anak yang tinggi di masa pandemi Covid-19 dapat diminimalisir. Penelitian ini dilakukan dengan membuat model jaringan saraf tiruan (JST) untuk mengetahui hubungan antara faktor dalam keluarga dan teknik mediasi orang tua di wilayah Bogor. JST penelitian ini dibangun menggunakan metode pembelajaran propagasi balik (backpropagation). Faktor dalam keluarga yang diteliti sebagai masukan JST adalah usia orang tua, pendidikan, jumlah anak, usia anak, durasi menggunakan internet, serta jumlah media sosial yang digunakan. Jenis mediasi orang tua yang digunakan sebagai luaran jaringan adalah mediasi aktif penggunaan internet umum, mediasi aktif penggunaan bersama, mediasi pasif penggunaan bersama, mediasi pembatasan aktivitas berinternet, mediasi pembatasan penggunaan internet secara umum, mediasi aktif keamanan internet, mediasi pemantauan, dan mediasi teknis penggunaan internet. Data diperoleh melalui survei terhadap 282 orang tua di wilayah Bogor pada Februari-Juni 2021. Penelitian ini telah membangun model JST untuk memprediksi kecenderungan tipe mediasi orang tua dengan mean-squared error sebesar 0.05132. Model yang dihasilkan dapat dikembangkan lebih lanjut menjadi aplikasi edukasi sederhana yang dapat digunakan oleh orang tua untuk mengetahui jenis mediasi yang mereka lakukan. Dengan lebih memahami jenis mediasi yang mereka lakukan, kami berharap orang tua dapat memiliki pemahaman lebih baik mengenai mediasi orang tua dan dapat menerapkan teknik mediasi yang paling sesuai dengan kondisi yang mereka alami untuk mewujudkan ketahanan keluarga.
Performance Analysis of ZigBee Mesh WSN in Carbon Monoxide Gas Monitoring System Muhammad Fuad; Muhammad Iqbal; Mamat Rahmat; Heru Sukoco; Husin Alatas
Indonesian Journal of Electrical Engineering and Computer Science Vol 15, No 3: September 2015
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v15.i3.pp576-583

Abstract

The need for air pollutant monitoring system is very substantial especially in the developing countries such as Indonesia. In this research, we have performed a test of such system for carbon monoxide gas based on wireless sensor network (WSN) using ZigBee. This system is working with a mesh topology where each sensor node can communicate with one another. There are seven nodes that serve as sensor nodes and one node serving as Coordinator. Each sensor node has five components that represent of gas sensors. We measure three performance metrics during the test, i.e. throughput, delay, and packet loss. The system has been successfully implemented which is capable of displaying information in real time. The experiment resulted in an average carbon monoxide value of 25.1 ppm and showed a good performance. It showed a throughput more than 1.017 kbps, delay and packet loss ratio less than 409 ms and 5 %, respectively.
Low-cost nitrogen dioxide monitoring station based on metal oxide sensor and cellular network Rady Purbakawaca; Arief Sabdo Yuwono; Husin Alatas; I Dewa Made Subrata
Indonesian Journal of Electrical Engineering and Computer Science Vol 26, No 1: April 2022
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v26.i1.pp105-115

Abstract

Air pollution has a negative impact on the environment and human health. Meanwhile, the number of conventional air quality monitoring stations is minimal due to high procurement and operational costs. This study proposes a nitrogen dioxide (NO2) pollutant measurement system using the metal oxide sensor (MOX) sensor and cellular network for data transmission in the measurement area. A calibration curve is used to measure NO2 levels based on the sensor's internal resistance changes. Measurement data of NO2 concentration, air temperature, relative humidity, and geospatial information are compiled and sent via global positioning system (GSM), general packet radio service (GPRS) radio communication with transmission intervals of every minute. The database server processes the data and displays it on the web application. System testing results at the Tugu Kujang Bogor at 15:38:00-16:38:00 September 23, 2021, showed that the concentration of NO2 ranged from 0.16-0.52ppm with an average of 270 ppb with an AQI of 133 in the unhealthy category for the sensitive group. The measured NO2 levels are outside the range of the NO2 concentration database in the industrial areas of Bogor and Jakarta for the 2016-2020 period. Therefore, this system provides an excellent opportunity to obtain real-time measurement data in the field.
Effect of Precursor Solvent on the Carbon Micro-Structures Derived from Spray Pyrolysis of Pine Resin (Gondorukem): Preliminary Study Jayadi; Wahyu Bambang Widayatno; Agus Sukarto Wismogroho; Cherly Firdharini; Akhiruddin Maddu; Husin Alatas; Yessie Widya Sari
Jurnal Sains Materi Indonesia Vol. 25 No. 2 (2024): Jurnal Sains dan Materi Indonesia
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jsmi.2024.893

Abstract

Carbon materials have been widely used in various fields. This study aimed to produce carbon using spray pyrolysis with pine resin (gondorukem) as the precursor and different solvents, namely gondorukem-acetone (GAC), gondorukem-ethyl acetate (GEA), and gondorukem-dichloromethane (GDC). The precursor was prepared in a 1:8 (m/v) ratio, and the spray pyrolysis method was employed by heating the atomized precursor solution in the heating zone of a tube furnace. The atomization precursor was infused with nitrogen gas at a rate of 1 l/min with furnace temperature set at 1000°C with heating times of 5, 10, and 20 mins. The carbonaceous materials produced from the pyrolysis were collected on the wire mesh 1000 that was put on a stainless pipe. Carbon that has been coated on the wire mesh 1000 was analyzed using the optical microscope (OM). The physical properties and morphology of the synthesized carbonaceous material were analyzed using field emission scanning electron microscopy (FE-SEM), Fourier-transform infrared spectroscopy (FTIR), Raman, and Brunaur-Emmett-Teller (BET). Based on FE-SEM analysis, the particle size of the GAC sample has an average of 283.58 nm and the highest carbon content, which reached an average of 97.312 At%. GAC samples had the lowest disorder properties in the Raman spectroscopy test, with the value of ID/IG reaching 0.795764. The functional groups observed were C–H stretching at 2920.49 cm-1, N–H bending at 1629.07 cm-1, and C–O stretching at 1159.70 cm-1. Based on carbon content, disorder properties, and functional group stabilization, carbon from the GAC precursor provides the ideal characteristics to be used as a filter material in medical masks. Meanwhile, based on BET testing, the carbon materials from GEA have the ideal material morphological properties to be used as a filter in medical masks. Spray pyrolysis is an efficient method for producing carbon materials, and the use of gondorukem as the precursor shows great potential for various applications.
Penguatan Tata Ruang Kota dalam Mitigasi Dampak Perubahan Iklim IPB, BPKB; Alatas, Husin; Dwiyanti, Fifi Gus; Helmi, Alfian; Qayim, Ibnul; Putra, Heriansyah; Utami, Anisa Dwi; Amigunani, Zahra Wajdini
Policy Brief Pertanian, Kelautan, dan Biosains Tropika Vol 6 No 3 (2024): Policy Brief Pertanian, Kelautan dan Biosains Tropika
Publisher : Direktorat Kajian Strategis dan Reputasi Akademik IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/agro-maritim.0603.1005-1011

Abstract

Perubahan iklim telah membawa dampak signifikan pada kondisi geografis dan lingkungan hidup di Indonesia, yang menjadi semakin rentan terhadap bencana alam. Dalam menghadapi tantangan ini, diperlukan langkah-langkah konkret dari pemerintah, seperti pembaruan kebijakan tata ruang, peningkatan standar konstruksi yang tahan bencana, dan pendekatan inklusif dalam pengambilan keputusan. Selain itu kerjasama antara pemerintah, sektor swasta, dan partisipasi aktif masyarakat dalam bentuk sadar bencana, penguatan tata ruang juga diperlukan dalam mencapai ketahanan dan keberlanjutan jangka Panjang. Beberapa strategi penguatan tata ruang dalam upaya mitigasi perubahan iklim antara lain pengelolaan Ruang Terbuka Hijau (RTH), konservasi lahan basah dan hutan, pola tata ruang yang berkelanjutan, pengelolaan air dan bencana alam, promosi pembangunan hijau dan efisiensi energi, perencanaan adaptasi perubahan iklim, dan penyusunan rencana aksi dan kebijakan.
Co-Authors Adly Maulana Suherman Agus Sukarto Wismogroho Akhiruddin Maddu Alfian Helmi Amigunani, Zahra Wajdini Arief Sabdo Yuwono Auzi Asfarian Cherly Firdharini Fifi Gus Dwiyanti H. Hardhienata Heru Sukoco I Dewa Made Subrata IBNUL QAYIM IPB, BPKB Irzaman, Irzaman Jayadi Karlisa Priandana Laksono Trisnantoro MAMAT RAHMAT Medria Kusuma Dewi Hardhienata Muhammad Fuad Muhammad Fuad Muhammad Iqbal Muhammad Iqbal Negara, Teguh Puja Peter John Morley Purbakawaca, Rady Putra, Heriansyah Tantan Taopik Ramlan Tantan Taopik Ramlan, Tantan Taopik Utami, Anisa Dwi Wahyu Bambang Widayatno Yessie Widya Sari