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All Journal Jurnal Teknik ITS Indonesian Journal of Industrial Engineering & Management International Journal of Economics, Business and Innovation Research
Ridzky Zul Asdi
Institut Teknologi Sepuluh Nopember Surabaya
Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Engineering Industrial & Manufacturing Engineering

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Kajian Tribologi Gesekan Antara Material Komposit Hidroksiapatit (HA) + Polymethyl Methacrylate (PMMA) dengan Ultra High Molecular Weight Polyethylene (PMMA) sebagai Prosthesis Sendi Rahang (TMJ) pada Manusia Ridzky Zul Asdi; Yusuf Kaelani
Jurnal Teknik ITS Vol 2, No 3 (2013)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (298.161 KB) | DOI: 10.12962/j23373539.v2i3.5108

Abstract

Temporomandibular joint prosthesis serta berbagai macam bentuk dan material sudah cukup banyak diteliti. Namun, sejauh yang penulis teliti, belum ada yang menggunakan Hidroksiapatit (HA) sebagai material utama. Penelitian ini bertujuan untuk mengetahui laju keausan dari material komposit hidroksiapatit (HA) + polymethyl methacrylate (PMMA) serta mekanisme keausan yang terjadi pada permukaannya untuk aplikasi prosthesis. Pengujian keausan dilakukan menggunakan tribometer pin-on-disc dengan material komposit sebagai spesimen pin dan ultra high molecular weight polyethylene sebagai material disc. Variasi yang dilakukan adalah variasi kandungan hidroksiapatit pada material komposit yaitu sebesar 40%, 50%, 60% dan 70%. Pengujian keausan dilakukan pada keadaan tanpa lubrikasi dan dengan lubrikasi menggunakan cairan collagen. Hasil pehitungan densitas menunjukkan bahwa penambahan kadar HA dalam komposit akan menambah nilai densitas. Hasil pengujian keausan menunjukkan bahwa spesimen komposit dengan 40% hidroksiapatit memiliki ketahanan aus paling baik yaitu sebesar 4,16×10-6 mm3/Nm untuk pengujian tanpa lubrikasi dan 3,55×10-6 mm3/Nm untuk pengujian dengan lubrikasi. Penambahan lubrikasi dapat menurunkan besarnya laju keausan sebesar 14%. Pengamatan permukaan kontak menunjukkan bahwa mekanisme keausan yang terjadi adalah kombinasi antara keausan adhesif serta abrasif.
Analysis Of Indonesian Rubber Export Competitiveness Daulika, Putri; Ridzky Zul Asdi
International Journal of Economics, Business and Innovation Research Vol. 4 No. 01 (2025): International Journal of Economics, Business and Innovation Research( IJEBIR)
Publisher : Cita konsultindo

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Abstract

Rubber is one of Indonesia's leading plantation commodities that is oriented to the international market with export destination countries to several countries. Rubber provides a positive contribution to the economy because it generates foreign exchange for the country. This study aims to analyze (1) the position of Indonesia's rubber competitiveness in internasional comparative advantages and (2) the position of Indonesia's rubber competitiveness in international competitive advantages. This study uses time-series data is from 2000 to 2022. The data were analyzed using a revealed comparative advantage (RCA), and Trade Specialization Index approach (TSI) to know the position competitiveness of Indonesian natural rubber. The results of this study show (1) Based on competitiveness analysis, through Revealed Comparative Advantage (RCA) indicate that the competitiveness of Indonesia's natural rubber exports on the international market has a comparative advantage seen from 2000-2022 with an average value of RCA> 1 which is equal to 1.01. While the competitive advantage for the competitiveness of Indonesian rubber exports is at the maturation stage. This condition occurs because the value of the Trade Specialization Index (TSI) approaches 1, which is 0.98
A Comprehensive Analysis of Building Construction Projects’ Delay Using the Analytic Network Process Asdi, Ridzky Zul; Utomo, Dutho Suh
International Journal of Economics, Business and Innovation Research Vol. 4 No. 01 (2025): International Journal of Economics, Business and Innovation Research( IJEBIR)
Publisher : Cita konsultindo

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Abstract

Delays in construction projects have emerged as a significant challenge due to their profound impact on costs, quality, and project timelines, all of which ultimately affect the overall success and completion of the project. The primary objective of this study is to identify the factors contributing to delays in building construction projects and to quantitatively assess the extent to which each of these factors influences project delays. To achieve this, a quantitative impact analysis of each identified factor is conducted using the Analytic Network Process (ANP). Five key factors have been identified as major contributors to project delays: design or specification changes, material procurement delays, adverse weather conditions, regulatory and permitting issues, and unforeseen risks. Among these, material procurement delays emerged as the most significant contributor, accounting for 36.13% of the total delay impact. This is followed by design or specification changes, unforeseen risks, regulatory and permitting issues, and adverse weather conditions. Further research is required to develop effective preventive measures to mitigate these delays and enhance project management practices.
Optimization of Fast Moving Consumer Goods Distribution Routes Using Vehicle Routing Problem at PT Cahaya Mahakam Samarinda Panjaitan, Irma Adelina; Wahyuda, Wahyuda; Asdi, Ridzky Zul
IJIEM - Indonesian Journal of Industrial Engineering and Management Vol 6, No 3: October 2025
Publisher : Program Pascasarjana Magister Teknik Industri Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/ijiem.v6i3.33473

Abstract

PT Cahaya Mahakam Samarinda, as one of the companies engaged in the distribution of fast-moving consumer goods, serves a variety of customers, including wholesalers, small shops, and food businesses. Based on the initial observations that have been made, the determination of distribution routes is carried out by the warehouse manager, who subjectively determines the route based on personal observations before the driver delivers consumer products because the company does not yet have the appropriate tools or methods to determine the route. This sometimes forces drivers to search for customer locations directly in the field if they have never delivered to that customer before, and sometimes there are inaccuracies in selecting the delivery route to the next customer. In this problem, it falls under the Vehicle Routing Problem, which is solved using the cluster first, route second approach with the Sweep method to create clusters and Nearest Neighbor with manual calculations, as well as Branch and Bound with calculations using the WinQSB software to determine the route for each created cluster. The results of both route creation methods were compared with the initial route. Based on the research results, the Sweep method produced 9 fewer clusters compared to the initial route of 11 clusters. In route determination, the Nearest Neighbor method resulted in a distance savings of 55.4 km (20.11%) and a cost savings of IDR 74,190.43. The Branch and Bound method resulted in savings of 64.6 km (23.47%) and cost savings of IDR 93,144.07.
Co-Authors Daulika, Putri Dutho Suh Utomo Panjaitan, Irma Adelina Raihana, Jasmine Najwa Wahyuda Wahyuda, Wahyuda Yusuf Kaelani