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Cahyadi, Tedy Agung
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Sensitivity analysis of coal mine project investment using fuzzy model utami, Hasrin citra; Cahyadi, Tedy Agung; Ernawati, Rika
Jurnal Mineral, Energi dan Lingkungan Vol 8, No 1 (2024): Jurnal Mineral Energi dan Lingkungan, Volume 8, No 1 Tahun 2024
Publisher : Fakultas Teknologi Mineral, Universitas Pembangunan Nasional (UPN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmel.v8i1.12396

Abstract

Investment analysis needs to be done to determine the feasibility of a project from an economic perspective. In this research, an investment analysis were applied in a coal mine project. The analysis were considering the results of NPV and IRR. NPV is the result of subtracting discounted costs [8]. IRR is an interest rate that shows the net present value is equal to the total amount of business investment [9]. The methods used in the analysis are the conventional method and the Fuzzy method. Conventional method is done by using NPV and IRR formula in Ms.Excel while Matlab for Fuzzy. The Fuzzy method apply a membership functions, namely triangular fuzzy number. The results of the analysis using conventional methods show an NPV value of $ 14,900,691 or IDR 223 Million with an IRR value of 69.8%. The results of the analysis using the fuzzy method with triangular membership functions showed the NPV values of IDR 232 Million and IRR 40.1 %. From the analysis, it can be seen that the fuzzy method is able to produce a larger NPV but a smaller IRR value whose value is close to conventional methods with the same input variables. So it can be concluded that the fuzzy method is quite well applied in investment analysis and it can help for the final decision of a project
Sensitivity analysis of coal mine project investment using fuzzy model utami, Hasrin citra; Cahyadi, Tedy Agung; Ernawati, Rika
Jurnal Mineral, Energi dan Lingkungan Vol 8, No 1 (2024): Jurnal Mineral Energi dan Lingkungan, Volume 8, No 1 Tahun 2024
Publisher : Fakultas Teknologi Mineral, Universitas Pembangunan Nasional (UPN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jmel.v8i1.12396

Abstract

Investment analysis needs to be done to determine the feasibility of a project from an economic perspective. In this research, an investment analysis were applied in a coal mine project. The analysis were considering the results of NPV and IRR. NPV is the result of subtracting discounted costs [8]. IRR is an interest rate that shows the net present value is equal to the total amount of business investment [9]. The methods used in the analysis are the conventional method and the Fuzzy method. Conventional method is done by using NPV and IRR formula in Ms.Excel while Matlab for Fuzzy. The Fuzzy method apply a membership functions, namely triangular fuzzy number. The results of the analysis using conventional methods show an NPV value of $ 14,900,691 or IDR 223 Million with an IRR value of 69.8%. The results of the analysis using the fuzzy method with triangular membership functions showed the NPV values of IDR 232 Million and IRR 40.1 %. From the analysis, it can be seen that the fuzzy method is able to produce a larger NPV but a smaller IRR value whose value is close to conventional methods with the same input variables. So it can be concluded that the fuzzy method is quite well applied in investment analysis and it can help for the final decision of a project
Rancangan Saluran Pada Pemindahan Aliran Sungai Kili Besar Di Area Pertambangan Batubara di Lahat, Sumatra Selatan Menggunakan Apllikasi HEC-HMS dan HEC-RAS Mendrofa, Yudha Chrisman; Tedy Agung Cahyadi; Shofa Rijalul Haq
Retii Vol 18 No 1 (2023): Prosiding Seminar Nasional ReTII ke-18 (Edisi Penelitian)
Publisher : Institut Teknologi Nasional Yogyakarta

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

Abstract

Pada pertambangan batubara, sering dijumpai adanya aliran sungai yang membentang di kawasan tambang. Hal ini tentu mempengaruhi produksi dan jalannya penambangan sehingga perlu dilakukan perlakukan khusus, yaitu pemindahan aliran sungai. Dalam pemindahan aliran sungai, perlu memperhatikan beberapa hal seperti, debit sungai rancangan, dimensi saluran sungai yang baru, dan lain sebagainya. Ini dilakukan tidak merusak lingkungan dan tidak mengakibatkan banjir di kemudian hari pada saluran sungai yang baru. Penggunaan aplikasi HEC-HMS dan HEC-RAS dapat membantu dalam perhitungan dan pemodelan saluran.
RANCANGAN GEOMETRI SALURAN TERBUKA DENGAN VALIDASI PEMODELAN GENANGAN SOFTWARE HEC – RAS Bimantoro, Adyaksa Bagas; Cahyadi, Tedy Agung; Rosadi, Peter Eka; Nusanto, Gunawan; Ratminah, Wawong Dwi; Riyadi, Achmad
Indonesian Mining Professionals Journal Vol 6, No 1 (2024): April
Publisher : PERHAPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36986/impj.v6i1.105

Abstract

Open channels are a medium for collecting and channeling water to keep the mining area dry. Often there are design changes in open channel designs to suit the field, causing more time and costs. Therefore, validation is needed that can simulate the calculated open channel design before actual application. Hydrologic Engineering Center – River Analysis System (HEC-RAS) is software for simulating inundation in open channel designs to convey water before it is actually applied. The initial method used is determining the planned rainfall using the gumbell method and determining the rain catchment area (DTH) to obtain runoff discharge. The runoff discharge with three DTHs as follows, DTH I = 6.47 m3/sec, DTH II = 7.38 m3/sec, and DTH III = 10.67 m3/sec is the data to obtain open channel geometry using the Manning formula. The results of the open channel geometric design will become input data for HEC-RAS in modeling open channel inundation to validate the suitability of the design results before applying them to the field.
DESAIN SALURAN TERBUKA BERBASIS MICROSOFT EXCEL: Perhitungan dan Pemodelan yang Praktis dan Effisien Faizal Agung Riyadi; Cahyadi, Tedy Agung; Nurkhamim; Supandi
KURVATEK Vol 4 No 2 (2019): November 2019
Publisher : Institut Teknologi Nasional Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33579/krvtk.v4i2.1563

Abstract

A channel is constructed as a media for water to flow. Phases of plan, design, and construction of a channel require a lot of time, effort, and budget. Design and construction of a channel need to be suited to certain requirements and characteristics of the location. Changes of design parameters often occurred as a result of technical and economical considerations. It leads to changes of channel design to adapt to the new parameters. Hence, the needs of tool to ease the calculation of channel design. Required parameters for channel design calculations are flow (Q), Chezy’s resistance factor (C), Darcy-Weisbach’s coefficient (f), atau Manning’s roughness factor (n), and the channel base gradient (i). The objective of this research are channel design calculations and modelling, in addition profide a tool which is practical and easy to use. The methods are Chezy, Darchy-Weisbach, and Manning formula to calculate the design of varied channel type using Microsoft Excel software. Determinations of Chezy’s resistance factor (C), Darcy-Weisbach’s coefficient (f), can be related to Manning’s roughness factor (n) value. Manning’s roughness factor (n) can be estimated from the size of channel bed’s lining material particles (d) using certain formula or define the value dirrectly from Manning’s roughness factor table.The result of this research including a tool for open channel design calculation and modelling“Kalkulator Desain Saluran – FAR”. The writers propose a new formula to estimate Manning’s roughness factor (n) value from the size of channel bed’s lining material particles (d). In addition, the writers propose formulas to directly calculate water level on the channel geometry section (y). The formula include coefficient of α which is based on relations of channel geometry parameters in to the formula of Chezy, Darchy-Weisbach, and Manning.
Planning for Normalization of the Apu River in the Post-Mining Area Gunawan, Risal; Ernawati, Rika; Cahyadi, Tedy Agung
Journal of Earth and Marine Technology (JEMT) Vol 5, No 1 (2024)
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.2024.v5i1.6432

Abstract

Miners often leave traces such as irregular river channels, holes in the mining area without repair measures, the mining area is located in Boyolali Regency, precisely in the Apu River area. Apu River is one of the centers of Merapi sand mining which is quite large, mining activities have the potential to cause river overflows. For this reason, improvements need to be made. This study aims to plan a post-mining model in a river that has changed, the method in this study is to take water discharge directly with 5 sampling points and analyze the distribution of gumbell rainfall for 10 years and make a comparison, then a trapezoidal open channel plan is made and modeled in HEC-RAS software. Based on the results of taking river water discharge, it is known that the maximum river flow velocity is 0.57 m3/second, while the results of the rainfall analysis are 2.77m3/second. so that in repairing the cross-section using a higher water discharge. The method of repairing the river cross-section is the trapezoidal open channel method, the dimensions of the open channel are designed using a manning roughness of 0.30. The initial design depth of the channel was 1.35 m plus 0.60 m to avoid flood overflow, so that the channel depth became 1.95 m.
Menuju Rumah Sakit Tangguh Bencana Berbasis Komunitas Stephanus Maria Eduat; Johan Danu Prasetya; Tedy Agung Cahyadi; Yohana Noradika Maharani; Widyawanto Prastistho; Yohanes Ary Prayoga; Bambang Dwijo Pranowo; Ficky Adi Kurniawan
Jurnal Anestesi Vol. 3 No. 2 (2025): Jurnal Anestesi: Jurnal Ilmu Kesehatan dan Kedokteran
Publisher : Stikes Kesdam IV/Diponegoro Semarang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59680/anestesi.v3i2.1713

Abstract

The hospital is the end of service for victims affected by disasters, the frequency and intensity of disasters that continue to increase give great responsibility to the hospital in reducing the rate of injury and even death so that the resilience of the hospital must be bouncy by maximizing all related elements. However, there is growing evidence that many hospitals are vulnerable to disasters, and more effective strategies are needed to minimize disaster risk. This paper uses the method of narrating a literature review with a simple process hierarchy analysis approach to see the priorities of implementing resilience in hospitals. The result of this paper is that hospital resilience will be able to increase by involving the community, both internal and external, by adopting good practices for community-based disaster risk management.
Neutralizing Acid Mine Drainage (AMD) and Reducing Iron (Fe) and Copper (Cu) Content Using Biomass Adsorbents Hendriono, Hendriono; Cahyadi, Tedy Agung; Ernawati, Rika
Journal of Earth and Marine Technology (JEMT) Vol 5, No 2 (2025)
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.2025.v5i2.6816

Abstract

Mining is an activity that always has an impact on the environment. The adverse effects that cannot be separated from the mining process are mined acid water, where the process of mining acid water occurs due to contact between sulfide rocks and air or water; environmental pollution by mined acid water must be overcome immediately, in the prevention of ecological damage by mine acid water, Various methods are carried out to reduce the impact of mine acid water pollution, one example of a technique that is often used is with limestone channels, where the gaps are filled with limestone fragments to neutralize mine acid water, The method used in this study is an experimental design with an adsorption process. The data collection method in the study uses literature studies, field observations, research preparations, rice husk preparation, coconut coir, and fine coal, Acid Water samples are taken and brought for the testing process. The test results using a pH meter at the Yogyakarta Center for Environmental Health and Disease Control Engineering (BBTKLPP) showed that the pH of AAT was 3.8. Based on the results of the AAS test at BBTKLPP Yogyakarta, the AAT sample contained Fe metal of 130.56 mg/L and Cu of 2.96 mg/L. The highest adsorption effectiveness was in a 3x24 hour adsorbent experiment with a period of 50 grams with a time of pH 45.71%, Fe 98.90%, and Cu 98.71%.
MODEL PREDIKSI PROBABILISTIK LONGSOR YANG DIPICU GEMPABUMI DI WILAYAH PURWOSARI, KULON PROGO Pramono, Sidik; Nugroho, Arif Rianto Budi; Cahyadi, Tedy Agung; Suharsono, Suharsono; Maharani, Yohana Noradika
JOURNAL ONLINE OF PHYSICS Vol. 10 No. 3 (2025): JOP (Journal Online of Physics) Vol 10 No 3
Publisher : Prodi Fisika FST UNJA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22437/jop.v10i3.44326

Abstract

Longsor yang dipicu gempa bumi merupakan ancaman signifikan di wilayah dengan topografi curam dan aktivitas seismik tinggi, seperti Purwosari, Kabupaten Kulon Progo. Penelitian ini bertujuan untuk mengkaji probabilitas longsor akibat gempa bumi melalui integrasi metode Horizontal to Vertical Spectral Ratio (HVSR) untuk karakterisasi geologi permukaan dan pemodelan probabilistik berdasarkan pendekatan Hamburger et al. (2020). Data mikrotremor dari 22 titik digunakan untuk mengestimasi parameter Vs30 dan ketebalan tanah (soil thickness), yang kemudian diintegrasikan dengan parameter spasial lain seperti peak ground velocity (PGV), kemiringan lereng (slope), dan Compound Topographic Index (CTI). Hasil pemodelan menggunakan regresi logistik multivariat menunjukkan bahwa 56,69% wilayah studi termasuk dalam kategori risiko rendah hingga sedang, 40,36% dalam kategori sedang hingga tinggi, dan 2,26% berada pada kategori tinggi. Integrasi metode HVSR dan model probabilistik dapat digunakan untuk mengidentifikasi zona rawan longsor akibat gempa bumi serta mendukung perumusan strategi mitigasi bencana dan perencanaan tata ruang berbasis kerentanan seismik di kawasan wisata alam seperti Purwosari.
ANALISIS HIDROLOGI MENGGUNAKAN METODE RASIONAL DAN NAKAYASU UNTUK SISTEM PENYALIRAN TAMBANG PADA PT. TRUBAINDO COAL MINING,KABUPATEN KUTAI BARAT, PROPINSI KALIMANTAN TIMUR Prawira, Hadi; Rosadi, Peter Eka; Cahyadi, Tedy Agung; Riyadi, Faizal Agung; Herniti, Dwi
Jurnal Teknologi Pertambangan Vol. 10 No. 1 (2024): Juli 2024
Publisher : Universitas Pembangunan Nasional Veteran Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/jtp.v10i1.13238

Abstract

Analisis hidrologi merupakan tahap yang penting dalam merancang sistem penyaliran tambang. Pada daerah penelitian, potensi banjir di area pemuatan (loading) akibat akumulasi air hujan memerlukan evaluasi hidrologi terhadap infrastruktur drainase tambang. Sementara itu, keberadaan air tanah juga menjadi masalah dan perlu ditangani dengan baik. Metode rasional umumnya digunakan untuk analisis hidrologi, mengingat kesesuaiannya untuk area operasi tambang yang relatif kecil. Selain itu, alternatif lainnya adalah dengan menggunakan metode Nakayasu. Dengan menerapkan dan membandingkan hasil perhitungan dengan kedua metode tersebut dapat membantu merancang dimensi saluran terbuka yang lebih sesuai untuk menangani air potensi air limpasan yang dapat mengganggu operasi penambangan. Analisis curah hujan menggunakan distribusi Gumbel dilakukan terhadap data dari 10 tahun terakhir (2013 - 2022) untuk periode ulang hujan 3 tahun, memperoleh hasil curah hujan harian terencana sebesar 148,97 mm/hari dan intensitas curah hujan sebesar 20,79 mm/jam, dan risiko hidrologi sebesar 86,8%. Daerah tangkapan hujan (DTH) di lokasi dibagi menjadi dua bagian: dalam area tambang (DTH I) dan di luar area tambang, yang terbagi lagi menjadi DTH II, DTH III, dan DTH IV. Nilai debit limpasan metode rasional adalah 2,7051 m³/detik, 1,2485 m³/detik, 0,7976 m³/detik, dan 0,7630 m³/detik, sedangkan hasil metode Nakayasu adalah 3,6446 m³/detik, 5,2492 m³/detik, 3,3523 m³/detik, dan 3,2654 m³/detik.
Co-Authors A. Belo, Delia Ximenes Abdul Halim Pelu Achmad Sadikin Agung Yulianto Nugroho Agustian, Yusrian Aisyah Salma Aji Lambang Hidayah aldin ardian, aldin Alfianto, Danny Aminuyati Amrin, Dedy Andrawina Wina Angggian R., Shahensah Anand Anggoro, Hengky Ansori, Muhammad Iqbal Anton Sudiyanto Anton Sudiyanto Ardinanta, Desta Nugraha Arif Munandar Arrina Khanifa Astika Putri Roshinta Bagus Wiyono Bagus Wiyono Bambang Dwijo Pranowo Barlian Dwinagara Bimantoro, Adyaksa Bagas Butungan, Jeragustivia Dahono Haryanto Dedy Amrin Deka Citra Dinata Delia Ximenes A. Belo Divina Maria Marques Doni Firdaus Fadlil Dwi Januar Ariyanto Dwi Mayanti Mega Lesmana Dwi Poetranto Waloeyo Adji Dwi Ratminah, Wawong Dwi Yolanda Sumbung Dyah Nunki Yalesrie Eddy Winarno Eddy Winarno Eddy Winarno, Eddy Edy Nursanto Edy Nursanto Edy Nursanto Edy Nursanto Edy Nursanto Eman Widijanto Erwedi Erwedi Erwedi, Erwedi Fadlil, Doni Firdaus Faizal Agung Riyadi Ficky Adi Kurniawan Firmansyah, Ilham Fitriani Fitriani Gabriel Ranteallo Gandar Mahojwala Genadi Toar Nainggolan Gunawan Nusanto Gunawan Nusanto, Gunawan Gunawan, Risal Habibah, Annisa Ummu Halimah Tusak Diah Hana Trijayanti Hartono Hartono Hartono Hartono Hartono Hartono Hartono Sihir Hasywir Thaib Siri Hasywir Thaib Siri Hasywir Thaib Siri hasywir thaib siri, hasywir thaib Hendriono Hengky Anggoro Herlina Jayadianti Herniti, Dwi Heru Suharyadi Ifa Aulia Chusna Ilham Firmansyah Imawati, Rika Indah Setyowati Indah Setyowati Indun Titisariwati Indun Titisariwati Indun Titisariwati Indun Titisariwati, Indun Inmarlinianto Inmarlinianto, Inmarlinianto Jeragustivia Butungan Jeremia Christopher Herbert Siregar Johan Danu Prasetya kadek nando setiawan nando Karel Lutan Warda Ketut Gunawan Ketut Gunawan Khanifa, Arrina Kresno Kresno Kresno Kresno Kurniawan, Fitra Kusumayudha, Sari Bahagiarti Laela Oktalia Nur Firdaus Leka, Emil Salim Kahmi Lesmana, Dwi Mayanti Mega Lilik Eko Widodo Linggasari, Shenny M. Rahman Yulianto Marganiswati, Yudha Tintana Mariatul Kiptiah Marques, Divina Maria Masjon Parhusip Mendrofa, Yudha Chrisman Moh Ardiansyah Monica Warih Widi Krisanti Muhammad Anggara Imam Tatowi Muhammad Arifin Nur Muhammad Fathurrahman Pitayandanu Muhammad Iqbal Ansori Muhammad Tri Aditya Muhammad Wildan Ilyasa Nainggolan, Genadi Toar Notosiswoyo, Sudarto Nugroho, Arif Rianto Budi Nur Ali Amri Nur Ali Amri Nur Ali Amri Nur Ali Amri, Nur Ali Nurkhamim Nurkhamim Nurkhamim Nurkhamim, Nurkhamim Pambayu, Aldio Kresna Pasa, Titis Ilham Permadi, Fajar Peter Eka Rosadi Peter Eka Rosadi, Peter Eka Pradika, Soga Prasetya, Johan Danu Prastistho, Widyawanto Prawira, Hadi Putranto, Fery Izzan R.Horman, Juanita Rahmat Aditya Ramadhana Adi Rusyada Rendy Fahlevi Resa Risal Pradita Reza Adhi Fajar Rika Ernawati Rika Ernawati Rika Ernawati Rika Ernawati Rika Ernawati Rika Ernawati Rika Imawati Risaldi Hidayat Riyadi, Achmad Riyadi, Faizal Agung Rusdi Darmawan S. Koesnaryo Sabrina Umi Khabibah Sari Bahagiarti Kusumayudha Sari Bahagiarti Kusumayudha satria fitrio SB, Waterman Septianto, Erwin Setiyawa, Meindra Shahensah Anand Angggian R. Shofa Rijalul Haq Sigit Bagus Prabowo Singgih Saptono, Singgih Siregar, Imerilda Parlina Siswahyudianto Soekamto, Untung Stephanus Maria Eduat Sudarto Notosiswoyo Sudaryanto Suharsono Suharsono Suyono Suyono Suyono Suyono Suyono Syafrianto, Syafrianto Syamsul Arifin Tasidjawa, Gabriela Elisabeth Totok Sulistyo Tri Aditya, Muhammad Ulfa Nindya Kesuma Warsito utami, Hasrin citra Vega Vergiagara Vinansius Jimmy Jati Waloejo Adji, Dwi Poetranto Waterman SB Waterman SB Waterman SB Waterman SB Waterman Sulistyana Bargawa Waterman Sulistyana Bargawa Waterman Sulistyana Bargawa Waterman Sulistyana Bargawa Waterman Sulistyana Bargawa, Waterman Sulistyana Wawong Dwi Ratminah Wawong Dwi Ratminah, Wawong Dwi Wenny Kartika Widijanto, Eman Widodo, Lilik Eko Widyawanto Prastistho Winda Winda Yohana Nodarika Maharani Yohana Noradika Maharani Yohanes Ary Prayoga Yulantoro, Marchell Yulfanzah Zuher Syihab