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All Journal Jurnal Reka Lingkungan Jurnal IPTEK Journal of Geoscience, Engineering, Environment, and Technology INTEGER: Journal of Information Technology PROMINE Prosiding Seminar Nasional Sains dan Teknologi Terapan Jurnal GEOSAPTA Prosiding Temu Profesi Tahunan PERHAPI KURVATEK Prosiding Seminar Teknologi Kebumian dan Kelautan (SEMITAN Journal of Earth and Marine Technology (JEMT) Journal of Metallurgical Engineering and Processing Technology Journal of Applied Sciences, Management and Engineering Technology (JASMET) Prosiding Seminar Nasional Teknologi Industri Berkelanjutan Jurnal Inovasi Pertambangan dan Lingkungan Journal of Innovative and Creativity J-Sil (Jurnal Teknik Sipil dan Lingkungan)
Avellyn Shinthya Sari
Institut Teknologi Adhi Tama Surabaya
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Transportation Other

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Evaluasi Kinerja Karyawan Terhadap Keselamatan Dan Kesehatan Kerja Pada Penambangan Batu Andesit CV. Empat Lima, Desa Morang, Kecamatan Kare, Kabupaten Madiun, Provinsi Jawa Timur Sari, Avellyn Shinthya; Agus Purwidadi, Pani Eka; Redanto Putri, Fairus Atika
Prosiding Seminar Nasional Sains dan Teknologi Terapan 2024: Menjembatani Energi Berkelanjutan dan Ekonomi Hijau melalui Transformasi Riset dan Teknologi T
Publisher : Institut Teknologi Adhi Tama Surabaya

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Abstract

CV. Empat Lima merupakan perusahaan pertambangan batu andesit, kegiatan penambangan menggunakan sistem tambang terbuka dengan membuat jenjang-jenjang dalam kegiatan penambangannya. Aktivitas penambangan tersebut dapat mengancam keselamatan dan kesehatan baik pada tenaga kerja, unit kerja, maupun masyarakat yang berada di sekitar area penambangan. Tujuan penelitian untuk mengetahui pengaruh pelaksanaan kebijakan K3 terhadap kinerja karyawan, dan upaya untuk meminimalisir potensi bahaya dilingkungan kerja. Metode penelitian menggunakan penelitian kuantitatif dan kualitatif dengan pendekatan deskriptif. Variabel pada penelitian ini yaitu variabel dependen Keselamatan dan Kesehatan Kerja (Y), dan variabel independen diantaranya Ketersediaan APD (X1), Lingkungan Kerja (X2), dan Perilaku Karyawan (X3). Pengambilan data kualitatif dilakukan dengan melakukan observasi dan wawancara, sedangkan untuk kantitatif dilakukan dengan penyebaran kuesioner, kemudian data tersebut dianalisis dengan uji validitas, uji realibiltas, dan uji regresi linear berganda. Hasil evaluasi menunjukkan bahwa pelaksanaan keselamatan dan kesehatan kerja tidak sesuai dengan prosedur sehingga menimbulkan kondisi tidak aman yang dapat berpengaruh pada kinerja karyawan. Contohnya yakni dengan karyawan tidak menggunakan APD. Hal ini dikarenakan kurangnya kesadaran para karyawan akan pentingnnya memakai APD serta kurangnya pengawasan dari pihak perusahaan. Pada uji regresi linear berganda, disimpulkan bahwa pada area tersebut terdapat pengaruh negatif dari perilaku karyawan terhadap penerapan keselamatan dan kesehatan kerja di CV. Empat Lima.
INVERSE DISTANCE WEIGHTED METHODS IN GROUNDWATER MODELLING PONJONG AREA, GUNUNG KIDUL REGENCY, SPECIAL REGION OF YOGYAKARTA, INDONESIA Sari, Avellyn Shinthya
Jurnal IPTEK Vol 28, No 2 (2024): December
Publisher : LPPM Institut Teknologi Adhi Tama Surabaya (ITATS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.iptek.2024.v28i2.5982

Abstract

Groundwater modeling is needed to display the underground dimensions of groundwater. The Inverse Distance Weighting (IDW) technique is the choice as the basis for groundwater model analysis because the analysis using this technique remains accurate even though it only uses a few sample points. The groundwater model in Sidorejo Village, Ponjong District, Gunungkidul Regency, Yogyakarta Special Region has a water thickness of between 4.5 – 13.85 meters. With a pore aquifer system, because based on data from field observations and interpretation of geological maps, Sidorejo village, Ponjong District, Gunungkidul Regency, Yogyakarta Special Region is included in the Wonosari formation with geological structures in the form of limestone, reef, calcarenite, calcarenite tuffan. As for the direction of groundwater flow to the west, following the slope of the slope found at the study site. While the results of groundwater quality analysis using the Inverse Distance Weighting (IDW) technique by testing several parameters including the degree of acidity (pH), electrical conductivity (DHL), Total Disolved Solid (TDS), iron (Fe), calcium (Ca) , magnesium (Mg), and calcium carbonate (CaCO3) it can be concluded that all test well samples indicated no contamination because all test parameters were still within normal limits.
Mine Drainage System Planning At PT Putra Coal in The North Kalimantan Region Sari, Avellyn Shinthya; Cahyono, Yudho Dwi Galih; Seran, Lucitania Grasella Rotyn
Journal of Applied Sciences, Management and Engineering Technology Vol 5, No 2 (2024)
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jasmet.2024.v5i2.6089

Abstract

Coal is a deposit of plant fossils that has undergone a peat process over a long period of time. A company in Malinau Regency, North Kalimantan Province, requires replanning for the existing drainage system because its holding pond or sump, which is a former pit, will be re-mined. Therefore, this research re-plans the drainage system to overcome this problem. The methods for data processing comprised the Gumbel method, the Monobe equation, the Seyhan equation, and the calculations of open channels and holding pond dimensions, as well as pump capacity. The mine drainage system creates channels or ditches that function to prevent runoff water from entering the mining area. The channel capacity was 0.6 m3 /second, or 2,261 m3 /hour, with a large runoff of 0.146 m3 /second, or 63 m3 /hour. The channel would be made in a trapezoid shape. Meanwhile, the mine dewatering method used a pumping system to release water into the sump. Using 1 pump of MF-420EX, the total flow of water that could be pumped reached 50,537 m3 /hour with working hours of 20 hours. The sump capacity was 28,825 m3 in a trapezoid shape with dimensions of 95 m surface length, 70 m surface width, 85 m base length, 60 m base width, and 5 m depth.
PENGELOLAAN AIR ASAM TAMBANG (ACID MINE DRAINAGE), MENJADI SUMBER AIR BERSIH DI PT. BUKIT ASAM TBK (STUDI KASUS IUP BANKO BARAT) Sari, Avellyn Shinthya; Cahyono, Yudho Dwi Galih; Kobba, Angga Pratama Putra
Jurnal Inovasi Pertambangan dan Lingkungan Vol 4, No 2 (2024): Jurnal Inovasi Pertambangan dan Lingkungan
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jipl.v4i2.42497

Abstract

Air asam tambang atau dalam bahasa asing disebut Acid Mine Drainage merupkan air yang terbentuk di lokasi penambangan dengan nilai pH yang rendah (pH < 4) dan memiliki logam terlarut yang tinggi, seperti logam besi  (Fe), aluminium (Al), mangan (Mg), cadmium (Cd), Tembaga (Cu), Timbal (Pb), seng (Zg), arsenic (Ar), dan merkuri (Hg). Nilai pH yang rendah pada air asam tambang menyebabkan mudahnya logam-logam tertentu larut dalam air. Penelitian ini adalah jenis penelitian eksperimental, dimana dalam mendapatkan data perlu dilakukan percobaan-percobaan berskala laboratorium untuk mengetahui pengaruh bahan penetral terhadap perubahan air asam tambang dengan parameter yang telah ditetapkan. Pendekatan yang digunakan yaitu pendekatan kuantitatif, karena data yang didapatakan berbentuk angka dan kemudian dilakukan perhitungan matematis untuk dijadikan bahan dalam penganalisisan dan penarikan kesimpulan. Berdasarkan hasil pengujian di laboratorium dan dianalisis secara regresi linear, penentuan banyaknya penggunaan kapur tohor perhari di lapangan didapatkan dengan mengkalikan dosis kapur skala laboratorium yaitu 0,2343 – 0,8468 gr/liter dengan debit aktual pompa yang masuk ke KPL BB 07 yaitu 70.656,05 m3/hari atau 70.656.050 liter/hari. Jika dikonversikan dalam jumlah karung, maka kebutuhan kapur tohor sejumlah 662-2.393 karung dengan asumsi bahwa 1 karung berisi kapur tohor seberat 25 kg. Supaya mendekati pH netral air senilai 7, perusahaan dapat menambahkan sekitar 1.239 karung/hari. Berdasarkan hasil pengujian skala laboratorium, maka didapatkan bahwa kualitas TSS, Fe, dan Mn sudah sesuai dengan baku mutu lingkungan yang ditetapkan, tetapi untuk kualitas pH perlu dilakukan penetralan. Pengelolaan air asam tambang yang dilakukan di KPL BB 07 yaitu dengan menaburkan kapur tohor setelah air asam tambang masuk ke kompartemen pertama dan dicek secara berkala di kompartemen terakhir. Kata Kunci : Air Asam Tambang, Kapur Tohor, Kompartemen
Kajian Teknis Mine Dewatering Pump Booster PT. Madhani Talatah Nusantara, Kabupaten Berau, Kalimantan Timur Sari, Avellyn Shinthya; Heryawan, Muhammad Aditya; Cahyono, Yudho Dwi Galih
Prosiding SENASTITAN: Seminar Nasional Teknologi Industri Berkelanjutan Prosiding SENASTITAN Vol. 05 2025
Publisher : Institut Teknologi Adhi Tama Surabaya

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Abstract

Operasi Tambang batubara pada PT. Madhani Talatah Nusantara Job Site PT. Berau Coal dalam proses penambangannya menerapkan sistem tambang terbuka. Pada tambang terbuka jika tidak ada sistem penyaliran tambang akan menyebabkan genangan air yang membanjiri area pit dan disposal. Pada lokasi penelitian pernah terjadinya banjir di area pit dan disposal, Dimana kondisi pompa yang ada di Sump G pit C2 memiliki performa yang sangatlah rendah dengan Physical Availability (PA) dibawah 80%. Tujuan penelitian ini yaitu mengetahui debit air limpasan yang akan masuk ke Sump G pit C2 serta jumlah pompa yang digunakan untuk pemompaan ke outpit. Metode penelitian dengan melakukan metode kuantitatif dan melakukan pengamatan secara langsung di lokasi penelitian yang meliputi : data topografi, data kondisi lapangan dan data curah hujan. Kondisi di lapangan jumlah pompa yang digunakan yaitu 2 pompa MF420 di sump G yang tidak dapat mengatasi banjir di area pit dan disposal. Berdasarkan data curah hujan harian pada lokasi penelitian di tahun 2014-2023 diperoleh curah hujan rencana sebesar 232,05 mm/hari dengan menggunakan distribusi Gumbel untuk periode ulang 15 tahun. Potensi debit air limpasan yang masuk area Pit C2 sump G yaitu 527.964,5 m3/hari dengan luas 252.60 Ha. kebutuhan pompa di sump G perlu menggunakan 3 pompa (2 pompa saat ini yang digunakan dan 1 pompa penambahan dengan pompa booster) untuk lokasi pompa booster untuk mendapatkan total head yang sesuai berada pada elevasi -10.
ANALISIS PENGARUH POTENSI AIR LAUT TERHADAP AIR TANAH KECAMATAN KENJERAN, KOTA SURABAYA Sari, Avellyn Shinthya; Atiyatussa’adah, Eva
Prosiding SENASTITAN: Seminar Nasional Teknologi Industri Berkelanjutan Prosiding SENASTITAN Vol. 05 2025
Publisher : Institut Teknologi Adhi Tama Surabaya

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Abstract

Seawater intrusion is the process of seawater entering the aquifer due to the presence of empty pore spaces, which then causes the mixing of seawater with groundwater. The problems in this study are as follows: how is the decrease in groundwater quality and changes in groundwater patterns. The method used is to perform a hydrochemical. Based on the results of the study, the groundwater level is known to range from 5 meters to 6 meters. This position will affect the effectiveness of preventing seawater intrusion towards the land/aquifer. If the interface position is fully closed to a flat/impermeable layer under the iron sand deposits, namely the gravel layer and the siltsone layer, then preventing seawater intrusion will be effective. However, if the interface hangs with a depth that is closer to the seawater surface/local land surface, then seawater infiltration will be wider. This results in the opening of the interface with a width of between 100 (aquifer layer).
The mined mass measurement by using drone technology approach in the local scale mining in Tumiyang area, Kebasen District, Banyumas Regency, Central Java, the observation area of CV. Sinergi Karya Solutif Patioran, Adi Reski Surya; Sari, Avellyn Shinthya; Siamashari, Muhammad Abdurrozak; Fathoni, Ahmad Ubaidillah; Julita, Ika Justitia; Gomes, Nazario
Journal of Earth and Marine Technology (JEMT) Vol 2, No 2 (2022)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2022.v2i2.2882

Abstract

In this study, the objective or focal point is the number of reserves that have been mined and how to calculate the volume mined using the Unmanned Aerial Vehicle (UAV) method. In the evaluation of the volume mined using the UAV approach in Tumiyang village, Kebasen sub-district, Banyumas regency, Central Java province, this research was conducted using qualitative and quantitative methods related to the characteristics and modeling of sediment distribution from prospect block exploration. This research was conducted in the even semester of the 2020-2021 academic year, which is between October 2020 to March 2021. Based on the results of the study, it can be concluded that the data collection process using the UAV method requires a short time and complete initial information regarding the condition of the research area is very important for success. aerial photography data collection. The data obtained is aerial photo data and with supporting data such as topography and geology. Based on data processing, the mined volume obtained using supporting software is 32,313.55 m3, while the volume obtained when we calculate manually is 247,050.65 m3.
Technical Study of the Drainage System Mine Dewatering at the Open Mine at PT Bukit Makmur Istindo Nikeltama Cahyono, Yudho Dwi Galih; Sari, Avellyn Shinthya; Sikopa, Maudy Cheisylia; Warayaan, Regina
Jurnal Teknik Sipil dan Lingkungan Vol. 10 No. 2: October 2025
Publisher : Departemen Teknik Sipil dan Lingkungan IPB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jsil.10.2.375-384

Abstract

The high rainfall that occurred throughout 2024 caused the capacity of the existing sedimentation pond to be unable to accommodate it, resulting in water overflowing and flooding the mining area. This study aims to examine the existing drainage system using quantitative and qualitative research methods. Based on the 2014-2023 rainfall analysis, Log Pearson III distribution with a 5-year return period, the planned rainfall was 142.25 mm/day, Rain Intensity 23.31 mm/hour for a rainfall duration of 3.08 hours/day. The total discharge entering the main sump was 7,771 m3/day and was discharged through the sump outlet mouth, connected by a ditch to Settlingpond 8. At this research location, there were 3 trapezoidal ditches namely: Ditch I 1.78 m3/sec, Ditch II 1.85 m3/sec, Ditch III 2.2 m3/sec. The calculation results showed that the main sump and ditch could still accommodate the total incoming discharge. The capacity of Sedimentation Pond 8, with a volume of 7,025 m3, is not sufficient to accommodate the total inflow of 8,293 m3/second and a sedimentation rate of 40-50%. Considering that the research area cannot be expanded due to land limitations, it is necessary to increase the height by 5 meters in the three settling pond compartments to enhance sedimentation efficiency. In addition, it is necessary to add 1 Ebara 200 x 150 FS4NA pump in the last compartment to help discharge water with a total discharge of 8,293 m3/day. The benefit of this research is that it is able to provide recommendations for managing the mine drainage system. 
PENGELOLAAN AIR ASAM TAMBANG (ACID MINE DRAINAGE), MENJADI SUMBER AIR BERSIH DI PT. BUKIT ASAM TBK (STUDI KASUS IUP BANKO BARAT) Sari, Avellyn Shinthya; Cahyono, Yudho Dwi Galih; Kobba, Angga Pratama Putra
Jurnal Inovasi Pertambangan dan Lingkungan Vol. 4 No. 2 (2024): Jurnal Inovasi Pertambangan dan Lingkungan
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jipl.v4i2.42497

Abstract

Air asam tambang atau dalam bahasa asing disebut Acid Mine Drainage merupkan air yang terbentuk di lokasi penambangan dengan nilai pH yang rendah (pH < 4) dan memiliki logam terlarut yang tinggi, seperti logam besi  (Fe), aluminium (Al), mangan (Mg), cadmium (Cd), Tembaga (Cu), Timbal (Pb), seng (Zg), arsenic (Ar), dan merkuri (Hg). Nilai pH yang rendah pada air asam tambang menyebabkan mudahnya logam-logam tertentu larut dalam air. Penelitian ini adalah jenis penelitian eksperimental, dimana dalam mendapatkan data perlu dilakukan percobaan-percobaan berskala laboratorium untuk mengetahui pengaruh bahan penetral terhadap perubahan air asam tambang dengan parameter yang telah ditetapkan. Pendekatan yang digunakan yaitu pendekatan kuantitatif, karena data yang didapatakan berbentuk angka dan kemudian dilakukan perhitungan matematis untuk dijadikan bahan dalam penganalisisan dan penarikan kesimpulan. Berdasarkan hasil pengujian di laboratorium dan dianalisis secara regresi linear, penentuan banyaknya penggunaan kapur tohor perhari di lapangan didapatkan dengan mengkalikan dosis kapur skala laboratorium yaitu 0,2343 – 0,8468 gr/liter dengan debit aktual pompa yang masuk ke KPL BB 07 yaitu 70.656,05 m3/hari atau 70.656.050 liter/hari. Jika dikonversikan dalam jumlah karung, maka kebutuhan kapur tohor sejumlah 662-2.393 karung dengan asumsi bahwa 1 karung berisi kapur tohor seberat 25 kg. Supaya mendekati pH netral air senilai 7, perusahaan dapat menambahkan sekitar 1.239 karung/hari. Berdasarkan hasil pengujian skala laboratorium, maka didapatkan bahwa kualitas TSS, Fe, dan Mn sudah sesuai dengan baku mutu lingkungan yang ditetapkan, tetapi untuk kualitas pH perlu dilakukan penetralan. Pengelolaan air asam tambang yang dilakukan di KPL BB 07 yaitu dengan menaburkan kapur tohor setelah air asam tambang masuk ke kompartemen pertama dan dicek secara berkala di kompartemen terakhir. Kata Kunci : Air Asam Tambang, Kapur Tohor, Kompartemen
Analysis Of Aquifer Characteristics Using The Method Cooper Jacob At Block X Pt. Geomine Bara Studio Site Kutai Kartanegara, East Kalimantan, Indonesia Sari, Avellyn Shinthya; Wardana, Novandri Kusuma; Cahyono, Yudho Dwi Galih; Sarastika, Ristya Mahda
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 3 (2025): JGEET Vol 10 No 03 : September (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.3.19690

Abstract

Using the Cooper-Jacob method, this research analyzes the characteristics of the aquifer in Block X of Geomine Bara Studio Site Ltd., Kutai Kartanegara. This method can determine the main hydrogeological parameters, such as the aquifer's hydraulic conductivity/permeability coefficient, transmissivity, and storage coefficient (storativity) of the aquifer. Data from the pumping test served to understand the aquifer's response to pumping. The research results showed that the aquifer in Block X had a transmissivity of 193,9949 m²/day, hydraulic conductivity of 6,0634335 m/day, and a storage coefficient (storativity) of 0,000137. The soil type at the test location was fine sandy with a low porosity value of n = 0,499%, and the soil permeability was low at k = 0,056403975 mm/ sec. Groundwater in the study area had quite potential for meeting the needs of Geomine Bara Studio Site Ltd in Kutai, Kartanegara, with a groundwater availability of H219,398 m³ and a withdrawal rate of Q 182,0678 m³/day. This study indicated high water flow capacity with low storage ability, suggesting a confined aquifer. It benefits sustainable groundwater management and mitigates environmental impacts in the study area.
Co-Authors Abdan Said Halim Limtar Adi Reski Surya Patioran Agus Purwidadi, Pani Eka Ahmad Betras Ediwana Ahmad Jefri Al Bukhari Ahmad Ubaidillah Fathoni Anastasia Nadia Gaidah Angga Pratama Putra Kobba Arie Fadjar Saputro Arlida Dwi Pangestika Arya Fernando Assa, King Christ Majesty Spencer Atiyatussa’adah, Eva Ayunida Sasti, Sylvesiana Billi Hanok Wambukomo Budiarto Budiarto Budiarto Budiarto Budiarto Budiarto Bukhari, Ahmad Jefri Al C. Prasetyadi Casimiro Orleans Martins Chaq, Nakhlah Amiroh Risyda Destyagung Febyeta Devananda Ediwana, Ahmad Betras eko purnomo Eko Purnomo Fajar Rizki Widiatmoko Fanani, Yazid Farid, Wendy Muhammad Ibnu Fathoni, Ahmad Ubaidillah Febyeta, Destyagung Fernando, Arya Fitri Indah Dwi Suci Freeda Inggrit Ulviandri Gaidah, Anastasia Nadia Geri, Martinus Lousiano Gomes, Nazario Gowarno, Marshellino Azry Hardi Wahono Haryanto, Suis Edi Heryawan, Muhammad Aditya Ika Justitia Julita Ikal Don Lelewa Iksan Iksan Iksan, Iksan Julita, Ika Justitia King Christ Majesty Spencer Assa Kobba, Angga Pratama Putra Kombongkila, Yopi Kusdarini, Esthi Kusumayudha, Sari Bahagiarti Latekay, Priskilla Lelewa, Ikal Don Limtar, Abdan Said Halim Mahardhika, Abimanyu Mahendra, Seftian Mahindra, Moch. Fahni Malik, Aldy Maulana Manopo, Sherina Marshellino Azry Gowarno Martinus Lousiano Geri Melang, Antonius Longan Minto Basuki Minto Basuki Miru, Poppy Paulina Moch. Fahni Mahindra Muhammad Abdurrozak Siamashari Nakhlah Amiroh Risyda Chaq Nazario Gomes Nazario Gomez Novandri Kusuma Wardana Osfaldo Try Sa’ban Pangestika, Arlida Dwi Patioran, Adi Reski Surya Poppy Paulina Miru Prasetyadi, Corolus Priskilla Latekay purba, Wilbert Hamongan Putra, Inga Kharisma Putri, Fairus Atika Redanto Ratih Hardini Kusuma Putri Sa’ban, Osfaldo Try Saleky, Dewy Belavista Sapto Heru Yuwanto Saputro, Arie Fadjar Sarastika, Ristya Mahda Sari Bahagiarti Kusumayudha Sari Bahagiarti Kusumayudha Satria Ambara Iriawan Satria Ambara Iriawan, Satria Ambara Seftian Mahendra Seran, Lucitania Grasella Rotyn Sherina Manopo Siamashari, Muhammad Abdurrozak Sikopa, Maudy Cheisylia Suci, Fitri Indah Dwi Suharsono Suharsono Suharsono Suharsono Suis Edi Haryanto Wahono, Hardi Warayaan, Regina Wendy Muhammad Ibnu Farid Widiatmoko, Fajar Rizki Wilbert Hamongan purba Yazid Fanani Yudho Dwi Galih Cahyono