Tony Yulianto
Departemen Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro, Semarang

Published : 48 Documents
Articles

Pengelompokan Optimal Kabupaten dan Kota Rawan Kriminalitas di Jawa Timur dengan Metode Analisis Kluster Terbaik Mardianto, M. Fariz Fadillah; Kuzairi, Kuzairi; Yulianto, Tony; Amalia, Rica; Faisol, Faisol
Zeta - Math Journal Vol 1 No 1 (2015): Mei 2015
Publisher : Universitas Islam Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (7821.667 KB) | DOI: 10.31102/zeta.2015.1.1.22-29

Abstract

Kriminalitas adalah kejadian melanggar hukum yang menganggu keamanan di suatu wilayah. Tingginya tingkat kriminalitas dapat menghambat mobilitas masyarakat dan investor. Kegiatan perekonomian, perdagangan, dan pendidikan dapat terganggu di suatu daerah yang dikategorikan sebagai daerah rawan jika keamanan tidak dijamin. Akhir-akhir ini isu kriminalitas menjadi topik yang menarik di Jawa Timur. Jawa Timur dengan luas wilayah yang besar, jumlah penduduk yang banyak dan beragam, serta pembangunan yang pesat memiliki probabilitas tinggi dalam hal kriminalitas. Pengelompokan daerah rawan kriminalitas perlu dilakukan. Dalam penelitian ini pengelompokan daerah rawan kriminalitas dilakukan dengan metode analisis kluster hierarki diantaranya single linkage, complete linkage, average linkage, dan metode ward, serta analisis kluster non hierarki dengan menggunakan metode k-means. Jumlah kluster optimal untuk tiap metode ditentukan dengan statistik Pseudo-F terbesar. Setelah mendaapatkan jumlah kluster optimal dengan Pseudo-F, langkah selanjutnya adalah menentukaan metode analisis kluster yang terbaik dengan melihat nilai internal cluster dispersion rate (icdrate). Semakin kecil nilai icdrate, semakin baik metode tersebut dalam melakukan pengelompokan. Setelah dilakukan pengelompokan didapatkan hasil lima kelompok yang optimal berdasarkan metode ward dimana terdapat lima kategori daerah  dengan tingkat kriminalitas sangat rawan, rawan, sedang, aman, sangat aman. Berdasarkan hasil analisis kluster dua wilayah disarankan untuk mendapatkan keamanan khusus yaitu Kota Surabaya yang merupakan daerah sangat rawan kriminalitas , dan Kota Malang dengan kategori rawan kriminalitas. Kedua daerah ini merupakan dua kota terbesar di Jawa Timur.
Penerapan Metode Beda Hingga pada Model Matematika Aliran Banjir dari Persamaan Saint Venant Hasan, Hasan; Yulianto, Tony; Amalia, Rica; Faisol, Faisol
Zeta - Math Journal Vol 2 No 1 (2016): Mei 2016
Publisher : Universitas Islam Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (322.254 KB) | DOI: 10.31102/zeta.2016.2.1.6-12

Abstract

Banjir merupakan suatu kejadian yang ditandai dengan naiknya muka air melebihi volume tampung air semisal sungai atau saluran air. Adapun banjir itu sering terjadi salah satunya di Indonesia karena Indonesia merupakan Negara tropis dan beberapa daerah pun juga air resapan sudah mulai berkurang. Dalam penelitian ini diselesaikan dari model matematika aliran banjir pada persamaan saint venant menggunakan metode Beda Hingga. Adapun hasil penelitian didapatkan suatu ketidakstabilan banjir yaitu dengandihasilkannya grafik yang yang terbentuk tidak menuju satu garis y artinya tidak menuju satu titik.
PEMODELAN 2D SEBARAN TAHANAN JENIS TERHADAP KEDALAMAN DAERAH PANASBUMI GARUT BAGIAN SELATAN MENGGUNAKAN METODE MAGNETOTELLURIK Destyanti, Dita; Yulianto, Tony; Gaffar, Eddy Z
YOUNGSTER PHYSICS JOURNAL Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Southern Garut geothermal area West Java, is one of the area with geothermal prospects, characterized by the surface manifestations of craters in Papandayan mountain region and hot springs in Ciarinem area. The area was composed by old volcanic rocks, generally consists of a tuff rocks, tuff breccias and lava. This study aims to interpret 2D modeling of resistivity distribution to the depth of Garut Southern area geothermal and to determine geothermal system of that area under magnetotelluric method (MT). This method is used because its capablility to detect subsurface structure to a thousand meters depth. The data was taken as much as 32 acquisition points. The Data was obtained from field acquisition process, further processed using SSMT 2000 MT Editor 90, and WinGLink software. The results showed the presence of two geothermal systems in Ciarinem and Papandayan mountain region, consist of clay cap rocks, reservoir rocks, and hot rock. Clay cap rocks wich tend conductive located at shallow depths with resistivity value ranging from 10 ? 30 ohm.m, reservoir rocks with resistivity value of between 40 ? 600 ohm.m and hot rocks that are more resistive have resistivity value ?700 ohm.m.
KLASIFIKASI DAERAH LONGSOR BERBASIS PENGOLAHAN CITRA MENGGUNAKAN JARINGAN SYARAF TIRUAN PROPAGASI BALIK Nuriskianti, Putri; Adi, Kusworo; Yulianto, Tony
YOUNGSTER PHYSICS JOURNAL Vol 4, No 2 (2015): Youngster Physics Journal April 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Landslides are natural events that occur due to the ground movement of the earth's surface. The movement influenced by its constituent such as soil type, land use and intensity of rainfall in some place that causes a material such as ground was moving. Research on landslide done based on field surveys. The potential of a region in the category of landslides can be done by mapping parameters - parameters of landslides in the form of a calculation using the image of a network system that has been trained to predict the condition of an area.Image processing is done by segmenting color for any information presented in an image of landslides parameters. The color segmentation results performed labeling process to represent the information in the image. Then the landslides indices obtained from the manual calculation of weighting parameters. The result of the calculation is used as an instructional manual for the neural network. Where the value of the index 1 is the lowest level of landslide or safety category. While the index level 5 is the highest landslide or category of highly vulnerable to landslides. To process the data from the manual calculation in artificial neural network using backpropagation algorithm.The research data was training data and testing of tissue obtained from the manual calculation of weighting parameters landslides. Network training successfully conducted with a total accuration (index normal manual landslides and landslide index network) of 100% and accuration of test results 91,2% network. In the training data used 96 samples of data and test data as much as 34 data.Keywords: Landslide index, color segmentation, artificial neural network.
PENGGAMBARAN PSEUDOSECTION BAWAH PERMUKAAN DARI SUATU PROSES EVAPOTRANSPIRASI TANAMAN JAGUNG MENGGUNAKAN PROGRAM RES2DINV Suroso, Teguh; Yulianto, Tony; Yulianto, Gatot
BERKALA FISIKA Vol 9, No 3 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The dipole-dipole investigation of one line corn crop subsurface condition have been done in relationship with evapotranspiration process. The variation of subsurface resistivity investigation occured by the caused of evapotranspiration process.The space of dipole-dipole array measured in 0,20 meter and 0,40 meter with n value  from 1 to 4. In May 21st,24th,28th,31st 2005 the dipole-dipole array was measured. The electrodes and  corn crop-line  possition is parallel. The depiction of subsurface condition viewed by using the Res2Dinv apparent resistivity data. The depiction showed the high resistivity of the corn crop area and the transpiration process is higher than evaporation process. Anomaly resistivity value in the pseudosection output  is 54,30 Wm. Keywords: dipole-dipole, evapotranspiration, resistivity
PEMODELAN 2D SISTEM PANA BUMI DAERAH GARUT BAGIAN TIMUR MENGGUNAKAN METODE MAGNETOTELURIK Salam, Riznia Aji; Harmoko, Udi; Yulianto, Tony
YOUNGSTER PHYSICS JOURNAL Vol 6, No 2 (2017): Youngster Physics Journal April 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

This research was conducted in the eastern part of the Garut area using magnetotelluric method that aims to create 2D model of the geothermal system based on distribution of rock resistivity value. Magnetotelluric method is used because it is able to identify subsurface structure to a depth of thousands of meters. In this research, the data measured from 9 different targets area and processed based on the flow such as converting time domain data into the frequency domain, identify noise data, perform two-dimensional inversion modeling and create geothermal systems. Based on the results, also compared with the interpretation of geological data and geochemistry of rocks known clay cap, reservoir, and hot rock. Furthermore, Clay cap has a value of 4-32 ?m resistivity on depth of 3000 m. Reservoir rock with resistivity value of 64-512 ?m at a depth of 1500-5000 m. While hot rock with 1024-8192 ?m resistivity value is under the reservoir rock.Keywords: Magnetotelluric, Eastern section of the Garut, geothermal system, resistivity
APLIKASI METODE MAGNETIK UNTUK IDENTIFIKASI SEBARAN BIJIH BESI DI KABUPATEN SOLOK SUMATERA BARAT Umamii, Aufi Maslihah; Yulianto, Tony; Wardhana, Dadan Dani
YOUNGSTER PHYSICS JOURNAL Vol 6, No 4 (2017): Youngster Physics Journal Oktober 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The aim of this research is to identify the subsurface structure in Solok West Sumatera by mapping the magnetic field. The measurement was made at 821 points in Solok, West Sumatra to obtain total magnetic field. Data processing was carried out by the daily variation correction and correction IGRF (International Geometric Reference Field) on magnetic field anomaly data to obtain the anomaly contour of total magnetic field.  Furthermore, the upward continuation process and reduction to pole process were applied to obtain the contour of local and regional anomaly. The result showed a pair of positive and negative closure which is then created a 2D model and 3D model using the software Geosoft Oasis Montaj. The 2D modeling showed that the subsurface structure with one of rock layer has a susceptibility of 0.185 and 0.196 cgs which is strongly suspected as iron ore mineral carrier rock. This rock layer is a unit of limestone derived from the Perem-age Barisan Formation. 3D modeling was used to calculate iron ore reserves in Solok, which is estimated to reach 1.414.579.375 ton.Keyword: magnetic field anomaly, susceptibility of rocks, iron ore, 2-D, 3-D.
INTERPRETASI STRUKTUR BAWAH PERMUKAAN BERDASARKAN DATA GEOMAGNETIK PADA DAERAH MATA AIR PANAS JATIKURUNG KABUPATEN SEMARANG Fitria, Laela; Yulianto, Tony; Harmoko, Udi
YOUNGSTER PHYSICS JOURNAL Vol 4, No 4 (2015): Youngster Physics Journal Oktober 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The interpretation of subsurface structure and the identification of caused of the hot springs Jatikurung by using magnetic method have been successfully carried out. In this study, magnetic data acquisition was carried out in 71 points by using a PPM (Proton Precession Magnetometer) geometrics type of GSM 19T models to get the values of the total magnetic field. Data processing began with IGRF (International Geomagnetic Reference Field) correction and diurnal correction to get the total magnetic anomaly. The corrected data has been used to create total magnetic anomaly contour. The total magnetic anomaly contour has been used to process reduction to plan surface. The result of reduction to plan surface has been used to create a contour upward continuation and then made reduction to the poles. The result of research showed the total magnetic anomaly closure pair of positive and negative indicated a fault zone below the surface. The closure pair of positive and negative close to the manifestation was made an incision to determine the subsurface structure of the region by creating a model of 2-dimensional (2D) using software Mag2DC. In 2D modeling result show that there was a fault zone about 1200 meters depth. At a depth of 326 to 1200 meters was interpreted as a cap rock with a value 0.2926 (SI). The exhibition of the hot springs Jatikurung was interpreted by the finding of adjacent fault with igneous intrusion which was estimated to save the residual of magma that can be used as a heat source.
INTERPRETASI STRUKTUR BAWAH PERMUKAAN DAERAH MANIFESTASI MINERAL EMAS SISTEM EPITHERMAL DENGAN METODE POLARISASI TERIMBAS (INDUCED POLARIZATION) DI DAERAH “X” KABUPATEN GARUT JAWA BARAT Rusyda, Alifa; Yulianto, Tony
YOUNGSTER PHYSICS JOURNAL Vol 3, No 4 (2014): Youngster Physics Journal Oktober 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

A geophysical investigation has been done using Induced Polarization Method at area ?X?, Garut, West Java. The purpose of this investigation is to identify the sub-surface stucture of a minerals gold epithermal system manifestation area.The research area is a gold prospect area which is a mining concession area ofAneka Tambang, Tbk. Stratigraphy lithology constituent part of the study area Jampang Formation which consists of andesite lava, andesite breccia, hornblende, and fine tuffaceous rocks. Induced Polarization method is usingelectrical properties of rocks by detecting the electrical polarization on the surface of metallic minerals beneath the earth's surfaceThe processed data is measured with Dipole-dipole configuration, with electrodes spaced 25 meters. Path length  200 meters, so the expected penetration depth reaches 600 meters. Data processing use software AGI EarthImager2D and Geosoft , is obtain imaging the model 2D and 3D  subsurface. The processing results is present in 2D and 3D, From the modeling results indicate that the tuff and Crystallin Tuff    rock and minerals sulphide (si-ka-il, ka-il) with resistivity values ranging from 150 to more than 1000 ohm.m ohm.m and chargeabilitas values ranged from 100 ms to more than 300 ms, distribution pattern is decreased from north to south and then to east in penetration depth reaches 600 meters of subsurface.Volume for estimated potential of minerals gold epithermal system manifestation is 161.302.421,7 m3Keywords: Gold, Epithermal System, Induced Polarization, AGI EarthImager2D, Geosoft
PEMODELAN INVERSI ANOMALI MAGNETIK 3D DAERAH MATA AIR PANAS DIWAK DAN DEREKAN Zulaikhah, Siti; Harmoko, Udi; Yulianto, Tony; Yulianto, Gatot; Widada, Sugeng; Dewantoro, Yusuf
YOUNGSTER PHYSICS JOURNAL Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Research of magnetic methods that aim to interpretation the subsurface structure around the hot springs area Diwak and Derekan and to identification caused of hot springs Diwak and Derekan has been successfully carried out. In this research, measurements were taken at 97 points using a proton precession magnetometer (PPM) type of GSM model 19T geometrics and two Geotron Magnetometer G5 models to get the value of the total magnetic field. Measurement data is processed by the daily variation correction and correction IGRF (International Geomagnetic Reference Field) to get the value of the total magnetic field anomaly. Corrected data used to create contours of the total magnetic field anomaly. Contour total magnetic field anomaly is used for the reduction to plan surface process and upward continuation process. The results of the upward continuation get the contours of local anomaly and regional anomaly, the results of the local anomaly contour then reduced to the pole. Results of the research is a pair of positive and negative closure indicate a fault structure below the surface. There are two pairs of positive and negative closure which an incision is made to determine the subsurface structure by creating a 2D model using the software Mag2dc. 2D modeling results indicate the existence of a second incision fault structure in the form of down trending fault southwest-northeast. Meanwhile, to make 3D models using software Mag3D and 3D modeling results indicate the presence of fault structures below the surface. Fault zone results of 2D and 3D modeling is a media outlet fluid to the surface in the form of hot springs Diwak and Derekan.