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All Journal International Journal of Management Science and Information Technology (IJMSIT) SENTRI: Jurnal Riset Ilmiah Jurnal Pendidikan Terapan Teknokris
Jenni Ria Rajagukguk
Universitas Krisnadwipayana
Aerospace Engineering Humanities Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Mechanical Engineering Social Sciences Other

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Analysis of The Effect of Fabrication and Installation Work on Cost Overruns in Steam Turbine Generator Projects and Coal Boilers in Palembang Jenni Ria Rajagukguk; Kudus Yallbert
International Journal of Management Science and Information Technology Vol. 2 No. 2 (2022): July - December 2022
Publisher : Lembaga Otonom Lembaga Informasi dan Riset Indonesia (KITA INFO dan RISET)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35870/ijmsit.v2i2.629

Abstract

Delays (time overruns, SPI < 1) and exceeding budget costs (cost overruns, CPI < 1) on EPC (Engineering, Procurement, Construction) Projects are a global phenomenon due to the very diverse and unique nature of construction projects so that many companies experience losses during construction execution work activities. A very critical job in the execution of EPC projects is fabrication and installation activities which are part of construction activities because there are very many variables that have an impact on cost overruns if the fabrication and installation work is not monitored and controlled properly.   In this study, an analysis of the effect of fabrication and installation work on cost overruns was carried out on the Steam Turbine Generator and Coal Boiler Project in Palembang.  The analysis was performed using SPSS Ver software. 25 by processing questionnaire data from the answers of 42 respondents. With good control and early anticipation of construction activities so that it can help project managers in managing projects more effectively and efficiently so that the SPI (Schedule Performance Index) and CPI (Cost Performance Index) are more than one and the achievement of other requirements in accordance with project specifications and contracts.
PENGARUH CACAT LAS TERHADAP KEKUATAN BAHAN JIS-3131 SPHC PADA KERANGKA HOSPITAL BED BAGIAN NAKADOKO BED Jenni Ria Rajagukguk
TEKNOKRIS Vol 23 No 2 (2020): Jurnal Teknokris Edisi Desember
Publisher : Fakultas Teknik Unkris Jakarta

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Abstract

Sistem manufaktur pengelasan produk yang berkualitas tentunya harus didukung oleh pemesinan yang baik. Suatu produk pemesinan harus memenuhi sifat mekanis permukaan yang diinginkan sebagai salah satu syarat produk tersebut dapat diterima Bed . Kerangka Hospital BED bagian Nakadoko dibahan bahan SPHC bahan JIS-3131. Plat SPHC selalu juga digunakan dalam industri alat rumah tangga, dekorasi logam, pembuatan bahan chasis mobil, knalpot dan rangka kendaraan bermotor. Pada penelitian ini pada proses produk selalu mengalami cacat las, permasalahannya (1) Apa yang menyebabkan terjadinya cacat las pada kerangka Hospital Bed type examination bed bagian Nakadoko. Dan (2) Bagaimana menganalisis kekuatan pengaruh cacat las pada kerangka hospital Bed Hospital Bed type examination bed bagian Nakadoko. Sehingga tujuan penelitian mengetahui penyebab terjadinya cacat las pada kerangka Hospital Bed type examination bed bagian Nakadoko dan menganalisis kekuatan pengaruh cacat las pada kerangka hospital Bed type examination bed bagian Nakadoko. Pada konstruksi las mengalami patah ulet, yang disebabkan karna terlihat adanya deformasi plastik yang cukup banyak. Pada satu produk, setiap mengalami cacat las menunjukkan satu titik point pengelasan yang kurang pengelasannya atau disebut undercut. Hasil las tidak center dari 2 sisi yang di las yang bisa menyebabkan material patah. Kerangka Hospital Bed, sehingga hasil kekuatan sambungan las yang dihasilkan adalah 4,256 kg/mm².
PENGARUH CACAT LAS TERHADAP KEKUATAN BAHAN JIS-3131 SPHC PADA KERANGKA HOSPITAL BED BAGIAN NAKADOKO BED Jenni Ria Rajagukguk
TEKNOKRIS Vol 24 No 1 (2021): Jurnal Teknokris Edisi Juni
Publisher : Fakultas Teknik Unkris Jakarta

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

Abstract

Sistem manufaktur pengelasan produk yang berkualitas tentunya harus didukung oleh pemesinan yang baik. Suatu produk pemesinan harus memenuhi sifat mekanis permukaan yang diinginkan sebagai salah satu syarat produk tersebut dapat diterima Bed . Kerangka Hospital BED bagian Nakadoko dibahan bahan SPHC bahan JIS-3131. Plat SPHC selalu juga digunakan dalam industri alat rumah tangga, dekorasi logam, pembuatan bahan chasis mobil, knalpot dan rangka kendaraan bermotor. Pada penelitian ini pada proses produk selalu mengalami cacat las, permasalahannya (1) Apa yang menyebabkan terjadinya cacat las pada kerangka Hospital Bed type examination bed bagian Nakadoko. Dan (2) Bagaimana menganalisis kekuatan pengaruh cacat las pada kerangka hospital Bed Hospital Bed type examination bed bagian Nakadoko. Sehingga tujuan penelitian mengetahui penyebab terjadinya cacat las pada kerangka Hospital Bed type examination bed bagian Nakadoko dan menganalisis kekuatan pengaruh cacat las pada kerangka hospital Bed type examination bed bagian Nakadoko. Pada konstruksi las mengalami patah ulet, yang disebabkan karna terlihat adanya deformasi plastik yang cukup banyak. Pada satu produk, setiap mengalami cacat las menunjukkan satu titik point pengelasan yang kurang pengelasannya atau disebut undercut. Hasil las tidak center dari 2 sisi yang di las yang bisa menyebabkan material patah. Kerangka Hospital Bed, sehingga hasil kekuatan sambungan las yang dihasilkan adalah 4,256 kg/mm².
Development of a Web-Based Performance Index Assessment System for Hazardous and Toxic Waste Management Jenni Ria Rajagukguk; Helen Octory
Jurnal Pendidikan Terapan Vol 4, No 2 May (2026)
Publisher : Sakura Digital Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61255/jupiter.v4i2.1024

Abstract

Purpose: This study aims to develop a web-based performance index assessment system for hazardous and toxic waste management by integrating technical and supporting indicators using the Multi-Criteria Decision Making (MCDM) and Analytic Hierarchy Process (AHP) approaches. The study also examines the system’s role in supporting transparent environmental evaluation and applied environmental learning. Methods: A quantitative research and development approach was employed using the MCDM-AHP method. Data were collected through literature review, regulatory analysis, expert judgment involving five environmental experts, and system simulations on three industrial entities with different waste management characteristics. The system was developed using a Python-Django framework and PostgreSQL database. Findings: The results indicate that the developed system provides objective, transparent, and consistent environmental performance assessments, with performance index values ranging from 60% to 92%. Industrial entities with higher levels of digitalization and standardized environmental management systems achieved better performance scores. The integration of environmental impact assessment also improved risk identification and monitoring effectiveness. Research Implications: The findings imply that digital-based environmental assessment systems can strengthen accountability, operational efficiency, and data-driven decision-making in hazardous waste management. However, the study is limited by the small number of expert respondents and simulation entities, which may affect broader generalizability. Originality: This study offers a novel contribution by integrating environmental performance indicators, MCDM-AHP analysis, and a web-based digital assessment platform into a unified hazardous waste management evaluation system that can also support applied environmental education and sustainability-oriented industrial governance.
Analysis of The Effect of Fabrication and Installation Work on Cost Overruns in Steam Turbine Generator Projects and Coal Boilers in Palembang Jenni Ria Rajagukguk; Kudus Yallbert
International Journal of Management Science and Information Technology Vol. 2 No. 2 (2022): July - December 2022
Publisher : Lembaga Komunitas Informasi Teknologi Aceh (KITA), Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35870/ijmsit.v2i2.629

Abstract

Delays (time overruns, SPI < 1) and exceeding budget costs (cost overruns, CPI < 1) on EPC (Engineering, Procurement, Construction) Projects are a global phenomenon due to the very diverse and unique nature of construction projects so that many companies experience losses during construction execution work activities. A very critical job in the execution of EPC projects is fabrication and installation activities which are part of construction activities because there are very many variables that have an impact on cost overruns if the fabrication and installation work is not monitored and controlled properly.   In this study, an analysis of the effect of fabrication and installation work on cost overruns was carried out on the Steam Turbine Generator and Coal Boiler Project in Palembang.  The analysis was performed using SPSS Ver software. 25 by processing questionnaire data from the answers of 42 respondents. With good control and early anticipation of construction activities so that it can help project managers in managing projects more effectively and efficiently so that the SPI (Schedule Performance Index) and CPI (Cost Performance Index) are more than one and the achievement of other requirements in accordance with project specifications and contracts.
Analisis Pengaruh Variasi Kecepatan Spindel Terhadap Kekasaran Permukaan Material Scr420h Hasil Pemesinan CNC Turning Mazak Quick Turn Smart 250 Syahrizal Rafli Ferdian; Jenni Ria Rajagukguk
SENTRI: Jurnal Riset Ilmiah Vol. 5 No. 7 (2026): SENTRI : Jurnal Riset Ilmiah, Juli 2026
Publisher : LPPM Institut Pendidikan Nusantara Global

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55681/sentri.v5i7.6974

Abstract

Surface quality is an important parameter in machining processes because it affects component performance, dimensional accuracy, and service life. In CNC turning processes, spindle speed is one of the cutting parameters that significantly influences the surface characteristics of machined components. SCr420H steel is widely used in automotive components requiring high wear resistance and dimensional precision; however, the effect of spindle speed variation on its surface roughness using a Mazak Quick Turn Smart 250 CNC turning machine requires further experimental investigation. This study aims to analyze the effect of spindle speed variations on the surface roughness of SCr420H material and determine the optimum spindle speed based on the lowest roughness value. A quantitative experimental method with a one-factor design was conducted by varying spindle speeds of 1200, 1400, 1600, 1800, and 2000 rpm during the finishing CNC turning process. Other machining parameters were maintained constant, including a feed rate of 0.20 mm/rev, depth of cut of 0.4 mm, VNMG 160404-HQ insert with a 0.4 mm nose radius, and dry machining conditions. Surface roughness measurements were performed using a Surfcom 1800G Surface Roughness Tester to obtain Ra and Rz values. The results showed that spindle speed variations produced a non-linear change in surface roughness. The average Ra values at spindle speeds of 1200–2000 rpm were 3.679 µm, 5.258 µm, 5.942 µm, 5.512 µm, and 3.411 µm, respectively, while the average Rz values were 24.015 µm, 33.640 µm, 36.811 µm, 34.812 µm, and 22.071 µm, respectively. The optimum machining condition was achieved at a spindle speed of 2000 rpm, which resulted in the lowest Ra and Rz values. These findings indicate that proper spindle speed selection can improve the surface quality of SCr420H during CNC turning and provide a reference for determining machining parameters in precision manufacturing processes.
Co-Authors Helen Octory Kudus Yallbert Syahrizal Rafli Ferdian