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All Journal Indonesian Journal of Geography Planesa JISI UMJ (Jurnal Integrasi Sistem Industri UMJ) Jurnal Tata Kota dan Daerah Journal of Intelligent Decision Support System (IDSS) Pengmasku Center of Knowledge Digital Transformation Technology (Digitech) Ekalaya: Jurnal Pengabdian Kepada Masyarakat Indonesia Equivalent: Jurnal Ilmiah Sosial Teknik Jurnal Ilmiah Sistem Informasi Ranah Research : Journal of Multidisciplinary Research and Development Jurnal Konstruksi dan Infrastruktur : Teknik Sipil dan Perencanaan Journal of Embedded Systems, Security and Intelligent Systems MULTIPLE: Journal of Global and Multidisciplinary Lakhomi Journal
Ghefra Rizkan Gaffara
Universitas Esa Unggul
Religion Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Public Health Social Sciences Transportation Other

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Geographic Information System Using Postgre SQL-QGIS for Slum Squatter Distribnution Mapping in North Jakarta Rizkan Gaffara, Ghefra; Maratis, Jerry; Sitoayu, Laras; Adi Pamungkas, Rian; Ummanah, Ummanah
Ranah Research : Journal of Multidisciplinary Research and Development Vol. 6 No. 6 (2024): Ranah Research : Journal Of Multidisciplinary Research and Development (Septemb
Publisher : Dinasti Research

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38035/rrj.v6i6.1173

Abstract

This research aim to build a geographic information system that displays a mapping of slum building distribution in North Jakarta. One of spatial software was developed using a method is the Rational Unified Process (RUP) method. This research aim to build a geographic information system that displays a mapping of building distribution in North Jakarta. This system was built using Postgre SQL and QGIS to build map. The research finding in the research is that there is a tendency for built-up areas to grow in slum areas due to the absence of rental fees, land and building costs, but the feasibility conditions of these areas are very unsuitable. This research is limited to implementing the use of Postgre SQL and QGIS software. Because the rendering process for the visual display is very difficult. I hope that in the future this research will be developed interesting 3D visualization accompanied by charts. The implication of this research is to make it easier to see the distribution of dense and slum areas and become a step for the government in making policies. The originality of this research is that there is still no one who combines the two software in mapping analysis.
PENINGKATAN EFISIENSI PRODUKSI KEMASAN PLASTIK DENGAN PENDEKATAN LEAN MANUFACTURING DAN VALUE STREAM MAPPING DI PT ABC Arief, Arief Suwandi; Amperajaya, Derajat; Abduh, Mukhamad; R, Ghefra; Aminullah, Kiki
JISI: Jurnal Integrasi Sistem Industri Vol. 12 No. 2 (2025): JISI UMJ
Publisher : Fakultas teknik Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/jisi.12.2.283-294

Abstract

Perkembangan industri yang pesat mendorong peningkatan persaingan antar perusahaan. Untuk bertahan dan berkembang, perusahaan perlu menerapkan strategi yang dapat meningkatkan kualitas produk serta mempertahankan konsumen yang semakin selektif. PT ABC merupakan perusahaan yang bergerak di industri kemasan plastik, menghadapi tantangan serius berupa tingginya tingkat pemborosan dalam proses produksi, rendahnya efisiensi kerja, serta kualitas produk yang tidak konsisten. Permasalahan yang ada di perusahaan saat ini teridentifikasi pada aktivitas menunggu (45,14%), transportasi (36,69%), dan gerakan (7,90%) yang mendominasi aliran proses produksi dan menyebabkan lead time yang tinggi. Penelitian ini bertujuan untuk meningkatkan efisiensi produksi dan meminimalkan pemborosan melalui penerapan pendekatan Lean Manufacturing dengan metode Value Stream Mapping (VSM). Pengumpulan data dilakukan melalui observasi langsung selama delapan bulan pada lini produksi, disertai analisis aktivitas berdasarkan kategori Value Added (VA), Non-Value Added (NVA), dan Necessary but Non-Value Added (NNVA). Hasil penelitian menunjukkan bahwa upaya perbaikan seperti penggantian troli menjadi forklift, perawatan mesin berkala, serta penyediaan alat cadangan berhasil menurunkan total waktu produksi dari 12.617 detik menjadi 7.983 detik dan mengurangi lead time dari 185.417 detik menjadi 180.786 detik. Selain itu, proporsi aktivitas bernilai tambah meningkat dari 49,30% menjadi 54,62%. Penerapan Lean Manufacturing dan VSM terbukti efektif dalam meningkatkan efisiensi, mengurangi pemborosan, dan memperbaiki ketepatan waktu pengiriman produk.
Transformation of land use change in Cilegon City 2017-2023 using passive sensor satellite imagery Kurniawan, Surya; Nurhaidar, Wa Ode; Gaffara, Ghefra Rizkan
Journal of Intelligent Decision Support System (IDSS) Vol 7 No 1 (2024): March: Intelligent Decision Support System (IDSS)
Publisher : Institute of Computer Science (IOCS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35335/idss.v7i1.202

Abstract

Transformation Land change that occurred in Cilegon City is a phenomenon that involves a significant transformation in urban land use over the last few years. Land is a natural resource that has an important function to meet various human needs. This change was caused by several factors, one of which was rapid population growth. This research involves analyzing satellite imagery from several different time periods to track the evolution of land use in Cilegon City. From the results of observations made, it is known that there is a reduction in green land in Cilegon City. Where in each period of the year there are changes in green land which is increasingly decreasing. This reduction was caused by several factors, namely the transfer of land function from greenland to housing and the occurrence of fires on the green land.
Regional function-based land use balance Nurhaidar, Wa Ode; Kurniawan, Surya; Gaffara, Ghefra Rizkan
Journal of Intelligent Decision Support System (IDSS) Vol 7 No 1 (2024): March: Intelligent Decision Support System (IDSS)
Publisher : Institute of Computer Science (IOCS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35335/idss.v7i1.203

Abstract

The balance between the availability of land and the need for control, use and utilization of land based on regional functions is important as a reference for sustainable development directions and maintaining environmental sustainability. Imbalance in land use affects the direction of development and environmental sustainability. For this reason, it is necessary to conduct an analysis to determine the balance between land availability and land needs within a certain period of time through the preparation of a land use balance based on regional function directions. This research aims to analyze the balance between land availability and land use as well as the suitability of land use for the direction of regional functions. The method in this research uses a multi-temporal approach by utilizing remote sensing technology and geographic information systems. The overlay process was carried out to see the land change of Baubau city and see the level of conformity of existing land use with the direction of regional functions. The results show that the 2016 land use balance has the highest assets in forest land use of 21097.66 Ha and the 2020 land use balance has the highest liabilities in forest land use of 20959.56 Ha. The trend of land change in 2016-2020 is the change of forest, open land, mixed gardens, settlements and shrubs/shrubs. The level of conformity of existing land use with the direction of the function of the area is very high with a percentage level of suitability of 90.83% and a level of incompatibility of 9.17%.
Kajian Perencanaan dan Pembangunan Sistem Informasi Berbasis WebGIS Kota Palu Gaffara, Ghefra Rizkan; Kasikoen, Ken Martina; Yudhanti, Gabriella Trisna; Maznah, Fina Zaimah
Digital Transformation Technology Vol. 3 No. 2 (2023): Artikel Periode September 2023
Publisher : Information Technology and Science(ITScience)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47709/digitech.v3i2.3046

Abstract

Palu is located in the Sulawesi most active fault, with an annual movement of about 7 cm. The epicenter was located near Donggala, with tremors felt in various regions, including North and East Kalimantan. The earthquake had an energy release of approximately 2.5 × 10^20 Nm, equivalent to 200 times the power of the Hiroshima bombing. This presents an interesting subject for studying how to develop a good and accessible disaster mitigation system by utilizing the available information technology today, where disaster information can be easily accessed and synchronized with existing disaster management systems to reduce the impact of earthquake disasters. This research aims to analyze earthquake disaster risks and develop a mitigation model through a spatial analysis approach using Geographic Information System (GIS). The methods employed include analyzing disaster risks by utilizing Digital Elevation Model (DEM) data, road data, and overlaying images with earthquake damage distribution. Additionally, qualitative analysis in the form of disaster management and mitigation analysis is conducted. The data obtained is used to design evacuation routes and determine post-earthquake shelter locations. The results of this research provide a better understanding of disaster vulnerability in the studied areas. Through the developed mitigation model, this research contributes to identifying effective mitigation strategies. The designed evacuation routes and post-earthquake shelter locations provide crucial information for emergency response planning. Furthermore, the analysis results are presented in the form of a WebGIS accessible through a website, enabling easy access to information by the general public
Sustainable Biogas Development in Argosari Village: A Spatial, Environmental, and Economic Feasibility Analysis Ghefra Rizkan Gaffara; Arfilian Permana Putra; Debby Syafriyandi; Raafi Widyaputra Yulianyahya; Ansadilla Niar Sitanggang
Journal of Embedded Systems, Security and Intelligent Systems Vol 6, No 3 (2025): September 2025
Publisher : Program Studi Teknik Komputer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59562/jessi.v6i3.9589

Abstract

Energy transition at the village level plays a crucial role in Indonesia’s strategy toward sustainable energy independence. This research examines the biogas-based renewable energy development in Argosari Village as a model of community-driven sustainability. The study integrates qualitative and quantitative analyses—spatial, environmental, and economic—using IPCC guidelines, Location Quotient (LQ), Internal Rate of Return (IRR), and Net Present Value (NPV). The research involved interviews with 45 households, three focus group discussions with farmer associations, and secondary data from the Malang Regency Bureau of Statistics. Results show that 57% of households have installed biogas units, reducing GHG emissions by approximately 60% (1.2 tons CO₂ per household annually), and achieving a B/C ratio of 1.75. Sensitivity analysis indicates project feasibility remains positive even under ±15% variation in maintenance and subsidy levels. Comparative analysis with rural biogas programs in India and China highlights Argosari’s unique integration of social, economic, and environmental benefits. This study contributes a replicable framework for community-scale renewable energy implementation in rural Indonesia.
Javanese Cultural Heritage Building (Case Study: Joglo House) Ghefra Rizkan Gaffara; Dayu Ariesta Kirana Sari; Nanda Saputra
Lakhomi Journal Scientific Journal of Culture Vol 2 No 4 (2021): Lakhomi Journal : Scientific Journal of Culture, December
Publisher : Britain International for Academic Research (BIAR-Publisher)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/lakhomi.v2i4.533

Abstract

For centuries East Java is one of the tribes in Indonesia that has a unique cultural treasure. This culture has been passed down from generation to generation since the days of the kingdom. Model approach in this research is leading to a descriptive qualitative ethnographic, in which the empirical reality a result, demanding researchers go directly to the location of the study, to be able to live up to their tradition, and the symptoms of everyday life that is full of social phenomena local culture. The relation between construction is a structure which is strongly influenced by the manifestation process mythology and cosmology Java). This means that the traditional Javanese house is not just a place to shelter (practical function), but also understood as a manifestation of the ideals and outlook on life or a symbolic function. In this case the traditional Javanese houses are not only placed as an autonomous element, a separate stand alone, but being seen in context, particularly relevant to the context of allied Javanese cosmology that underlie the view that the Javanese philosophy of life.
Analisis Faktor-Faktor Penyebab Kecelakaan Lalu Lintas Ruas Jalan Mawasangka Tengah-Mawasangka Kabupaten Buton Tengah Muh Said Waristo; Al Tafakur La Ode; Ghefra Rizkan Gaffara; Septi Adnan; Fadila Fadila
Jurnal Konstruksi dan Infrastruktur : Teknik Sipil dan Perencanaan Vol 14 No 1 (2026): Jurnal Konstruksi dan Infrastruktur Vol 14 No.1 : April 2026
Publisher : Civil Engineering Department, Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jki.v14i1.12047

Abstract

The aim of this study was to analyze the factors causing traffic accidents along the Mawasangka Tengah-Mawasangka road section in Central Buton Regency. Traffic accidents are influenced by various interrelated factors, which can generally be classified into two main categories: human factors and technical factors. Technical factors include road infrastructure conditions, traffic flow characteristics, and pavement conditions. Based on the accident analysis conducted in the study area, it was found that accidents were predominantly caused by driver error or negligence rather than by other contributing factors. The accident data were obtained from the Central Buton Police Department and supported by direct field surveys conducted at identified blackspot locations along the Mawasangka Tengah-Mawasangka road section. The analysis employed the Cumulative Sum (CUSUM) method and the Accident Equivalent Number (AEK) method to identify accident-prone locations and assess accident severity. The results indicate that: (1) the primary blackspot location along the Mawasangka Tengah-Mawasangka road section is situated in Mawasangka Tengah District, accounting for 53.93% of the total recorded traffic accidents, with 48 accident cases recorded during the study period and an AEK value of 255, indicating a high level of accident severity; and (2) the contributing factors to traffic accidents were dominated by human factors (67.42%), followed by road conditions (16.85%), physical environmental conditions (13.48%), and vehicle factors (6.74%). Therefore, it can be concluded that human factors are the dominant cause of traffic accidents on the Mawasangka Tengah–Mawasangka road section, contributing 67.42% of all recorded accident cases.
Road Safety Study in Accident-Prone Areas on the Gading - Playen and Yogyakarta - Barongan Road Sections Raafi Widyaputra Yulianyahya; Ghefra Rizkan Gaffara; Ansadilla Niar Sitanggang; Irma Damayantie
Equivalent: Jurnal Ilmiah Sosial Teknik Vol. 8 No. 3 (2026): Equivalent: Jurnal Ilmiah Sosial Teknik
Publisher : Politeknik Siber Cerdika Internasional

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59261/jequi.v8i3.338

Abstract

Background: The background of this research stems from the high number of accidents occurring on this road section, which endangers the safety of road users. Objective: This study aims to analyze traffic safety on two road sections with high accident rates, namely the Gading–Playen Road and the Yogyakarta–Barongan Road. Methods: The research methods employed include field surveys, collection of primary and secondary data, and statistical analysis using the CUSUM method and the V/C (volume-to-capacity) ratio. Results: The analysis revealed Gading–Playen Road section has a capacity of 3,354 pcu/hour with a V/C ratio of 0.196, indicating stable traffic conditions, while the Yogyakarta–Barongan Road section has a capacity of 3,444 pcu/hour with a V/C ratio of 0.771, reflecting near-saturated traffic conditions and a higher-risk situation. Z-score analysis of accident data from 2016 to 2019 showed a sharp spike on the Yogyakarta–Barongan section in the third period (z = +1.55), while the Gading–Playen section recorded a significant decline (z = −1.13). Accidents on both sections predominantly involve motorcycle users and male victims aged 16–25 years, and are primarily caused by undisciplined driving behavior. Key recommendations include geometric road improvements, installation of adequate traffic signs, improved road lighting, and strengthened enforcement of traffic regulations. Conclusion: The integration of CUSUM, Z score, and V/C ratio methods provides an effective framework for identifying and assessing traffic accident risks. The findings reveal distinct risk characteristics between road sections, requiring targeted interventions based on geometric conditions, traffic intensity, and behavioral factors.
ANALISIS BIAYA TRANSPORTASI AIR DARI PELABUHAN RAMBANG KE DESA BAHAUR UNTUK PENGEMBANGAN TRANSPORTASI WILAYAH Gaffara, Ghefra Rizkan; Widjaya, Christian Dwi Putra
Tata Kota dan Daerah Vol. 18 No. 1 (2026): Jurnal Tata Kota dan Daerah
Publisher : Department of Urban and Regional Planning, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.takoda.2026.018.01.1

Abstract

Transportasi air memiliki peran penting sebagai moda utama di wilayah yang belum sepenuhnya terlayani infrastruktur darat, seperti jalur Pelabuhan Rambang menuju Desa Bahaur Hulu di Kecamatan Kahayan Hilir, Pulang Pisau. Penelitian ini bertujuan untuk menganalisis struktur biaya operasional moda speed boat serta menentukan titik impas (Break Even Point) sebagai dasar penetapan tarif yang wajar. Data dikumpulkan melalui observasi langsung dan dokumentasi dari instansi terkait, kemudian dianalisis dengan pendekatan biaya tetap, biaya variabel, dan perhitungan BEP. Hasil analisis menunjukkan bahwa total biaya operasional per perjalanan (ret) mencapai Rp 4.105.380,36, dengan tarif dasar per penumpang sebesar Rp 347.372,11. Tarif yang berlaku saat ini yaitu Rp 382.000 memberikan margin keuntungan sebesar Rp 34.627,89 per penumpang. Titik impas tercapai pada 7 penumpang per perjalanan, yang berarti operator memperoleh keuntungan saat mengangkut lebih dari jumlah tersebut. Temuan ini menunjukkan bahwa tarif yang berlaku masih berada dalam batas kewajaran dan layak bagi pengguna jasa, sekaligus menguntungkan bagi operator. Dengan demikian, hasil penelitian ini diharapkan dapat menjadi acuan bagi pemangku kebijakan dan pelaku usaha dalam menetapkan tarif yang berkeadilan serta berkelanjutan. Selain itu, analisis ini memberikan gambaran menyeluruh mengenai struktur biaya transportasi air di wilayah terpencil, yang dapat dimanfaatkan dalam perencanaan transportasi dan peningkatan konektivitas antar wilayah
Co-Authors Ade Arianto Al Tafakur La Ode Aminullah, Kiki Ansadilla Niar Sitanggang Ardiansyah, Dede Arief Suwandi Aryaguna, Prama Ardha Christian Dwi Putra Widjaya Dayu Ariesta Kirana Sari Dayu Ariesta Kirana Sari Debby Syafriyandi Fadila Fadila Fina Zaimah Maznah Gabriella Trisna Yudhanti Irma Damayantie Ken Martina Kasikoen Kurniawan, Surya Laras Sitoayu M Derajat Amperajaya M. Erlan Kurniawan Maratis, Jerry Muh Said Waristo Mukhamad Abduh Nurhaidar, Wa Ode Putra, Arfilian Permana Raafi Widyaputra Yulianyahya Rasjidin, Roesfianjah Rian Adi Pamungkas Saputra, Nanda Septi Adnan Sitanggang, Ansadilla Niar Syafriyandi Ummanah Ummanah, Ummanah Yudhanti, Gabriella Trisna