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<![CDATA[Optimization of Manufacturing Company's Production Process Using Lean Six Sigma ]]>
<![CDATA[Fortuna, Dhea]]>;
<![CDATA[Yuliawati, Evi]]>
<![CDATA[ Jurnal Teknologi Vol 16, No 2 (2024): Jurnal Teknologi ]]>
Publisher : <![CDATA[Fakultas Teknik Universitas Muhammadiyah Jakarta ]]>
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DOI: 10.24853/jurtek.16.2.213-224
<![CDATA[In the manufacturing industry, product quality is the main focus. Companies must ensure products meet quality standards. PT. Preshion Engineering Plastec Surabaya is a company that produces plastec supporting components. The object of this study is Yamaha emblem assy products. With Lean six sigma using DMAIC (Define, Measure, Analyze, Improve, Control) methodology to improve production processes. In addition, it improves the efficiency and effectiveness of the production process, improves product quality. The emblem assy product from CTQ shows that there are 4 defects that occur, namely outgoing rays, dirty, shin marks, and short mold. So that the DPMO (Defect Per Million Opportunies) value from January to March 2023 is 159784.715 with an average of 13315.39 and produces a sigma value of 45.0011 with an average of 3.75. Identification of the root causes of defects in Emblem assy products that are dominant with fishbone diagrams, namely dirty injection machines and material mixing machines, old machine age. It is hoped that further research can identify the factors that cause product defects with broader and more significant aspects to be used.]]>
<![CDATA[Analysis of Gangway Noise Influence On Interior Noise Of K1 Stainless Steel Train ]]>
<![CDATA[Dyah, Ainun Purwining]]>;
<![CDATA[Salim, Alfi Tranggono Agus]]>;
<![CDATA[Apriyanto, R. Akbar Nur]]>;
<![CDATA[Nurdiansyah, Rahardian Titus]]>;
<![CDATA[Hibbanurrohim, Muhammad Ibram]]>;
<![CDATA[Hakiki, Zahrani Aniela]]>
<![CDATA[ Jurnal Teknologi Vol 16, No 2 (2024): Jurnal Teknologi ]]>
Publisher : <![CDATA[Fakultas Teknik Universitas Muhammadiyah Jakarta ]]>
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DOI: 10.24853/jurtek.16.2.267-274
<![CDATA[Noise is caused by uncontrollable sounds affected by public health problems and listener discomfort. The research problem is the noise from the gangway to the interior noise of the K1 stainless steel train in evaluating comfort on the train. This research aims to analyze the acoustic characteristics of the gangway and the noise insulation of the gangway based on the value of the sound transmission class. The research method is a quantitative experiment the measures the acoustic parameters of the static K1 stainless steel train at a height of 1.2 m from the floor using a microphone that has units of dB. The study results are the transmission loss (TL) value in the gangway 43.3 dB, the FSTC value in the gangway 15, 11, 18, 23, and the STC value from the simulation results 22. The conclusion of the study is the STC value in the gangway from the calculation results and simulation results based on value classification STC in the ASTM E413-16 standard is categorized as low insulation with a low sound of 20-25.]]>
<![CDATA[Minimizing Production Costs Through Aggregate Production Planning with Compromise Strategy in the Food Industry ]]>
<![CDATA[Saputra, Dafid Mega]]>;
<![CDATA[Hernadewita, Hernadewita]]>;
<![CDATA[Hendra, Hendra]]>
<![CDATA[ Jurnal Teknologi Vol 16, No 2 (2024): Jurnal Teknologi ]]>
Publisher : <![CDATA[Fakultas Teknik Universitas Muhammadiyah Jakarta ]]>
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DOI: 10.24853/jurtek.16.2.179-186
<![CDATA[The food industry is required to carry out production efficiency by minimizing production costs and maintaining competitiveness in the market. One approach that has proven effective in optimizing the production process is through the application of aggregate production planning. This research aims to design a compromise production planning strategy by considering various factors that influence production costs in the food industry, achieve efficiency, and reduce production costs significantly. This research uses an aggregate production method through a compromise strategy model approach to order data for a year. The research results showed that there were two production planning alternatives, namely the first alternative is variable constant labour with overtime, required additional production costs of IDR 338,080,241, while the second alternative is workforce variations, required additional production costs of IDR 301,229,167. The second production alternative can be chosen to be implemented in production planning due to it requires lower costs. Through this study, it is expected that it can provide a valuable contribution to practitioners and academics in understanding the important role of aggregate production planning in achieving production cost efficiency goals in the food industry]]>
<![CDATA[Investigation of Thermal Conductivity and Dynamics Viscosity of Green Nanofluids (ZrO2-SiO2) ]]>
<![CDATA[Ramadhan, Anwar Ilmar]]>;
<![CDATA[Saptaji, Kushendarsyah]]>;
<![CDATA[Hendrawati, Tri Yuni]]>;
<![CDATA[Sari, Alvika Meta]]>;
<![CDATA[Umar, Efrizon]]>;
<![CDATA[Aziz, Azmairit]]>;
<![CDATA[Semendo, Rifqi Putra]]>;
<![CDATA[Setiawan, Hanif Rama Yuda]]>;
<![CDATA[Firmansyah, Firmansyah]]>
<![CDATA[ Jurnal Teknologi Vol 16, No 2 (2024): Jurnal Teknologi ]]>
Publisher : <![CDATA[Fakultas Teknik Universitas Muhammadiyah Jakarta ]]>
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DOI: 10.24853/jurtek.16.2.301-312
<![CDATA[In recent years, research has been directed towards improving the thermophysical properties of single-component nanofluids. Therefore, hybrid or composite nanofluids are developed to improve heat transfer performance. The thermophysical properties of ZrO2-SiO2 nanoparticles suspended in a mixture of water (W) and ethylene glycol (EG) with vol 60:40 or Green Nanofluids for various volume concentrations were investigated. Experiments were performed for volume concentrations of 0.1, 0.2, and 0.3% of green nanofluids at 50, 60, 70, and 80°C. Measurements of thermal conductivity and dynamic viscosity are performed at temperatures ranging from 50-80°C. The highest thermal conductivity of the green nanofluids is obtained at a concentration of 0.3%, and the maximum increase is up to 37.5% higher than the base fluid (EG/W). Meanwhile, evidence from the dynamic viscosity of green nanofluids is affected by concentration and temperature. Furthermore, the green nanofluids behave as a Newtonian fluid in a volume concentration of 0.1-0.3%. In conclusion, the combination of increased thermal conductivity and dynamic viscosity at a concentration of 0.3% has optimal conditions, which has more advantages for heat transfer than at other concentrations.]]>
<![CDATA[Effect of Acid Activation and Al Impregnation in Preparation of Bleaching Earth Catalyst for Glyerol Ketalization ]]>
<![CDATA[Tarmidzi, Fadhil Muhammad]]>;
<![CDATA[Sa'pangan, Desly Angeline]]>;
<![CDATA[Adawiyah, Winda Robiatul]]>;
<![CDATA[Gunawan, Adrian]]>
<![CDATA[ Jurnal Teknologi Vol 16, No 2 (2024): Jurnal Teknologi ]]>
Publisher : <![CDATA[Fakultas Teknik Universitas Muhammadiyah Jakarta ]]>
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DOI: 10.24853/jurtek.16.2.225-232
<![CDATA[Indonesia's increased biodiesel production represents the government's support for implementing replacement strategy of diesel to biodiesel (B30). The consequence's includes a higher production of glycerol as a byproduct. Currently, glycerol's use in Indonesia has remained limited to the pharmaceutical, polymer, and agricultural industries. On the other side, another application for glycerol as a biodiesel additive is being explored. Therefore, glycerol must be valorized in order to promote the development of clean bioenergy in Indonesia. Solketal as biodiesel additive can be produced by ketalizing glycerol with acetone in the presence of catalyst under acidic condition. In this research, a bleaching earth catalyst, one of the components utilized as a bleaching agent in the biodiesel industries, was developed. Bleaching earth is a form of clay with acidic characteristics that makes it an excellent catalyst in the ketalization process. To increase its surface area and active side, it was activated with sulfuric acid and impregnated with aluminum. The XRD and SEM analyses revealed no significant changes in the catalyst, however the IR spectra revealed a drop in the intensity of the Al-O group. The ketalization process was carried out at 60oC for 2 hours with a catalyst load of 1.5% and a glycerol:acetone:ethanol ratio of 1:1:1. The activation process with 15 M sulfuric acid and 1:1 impregnation was able to convert 15.22% glycerol while 1:5 impregnation is 23.73%. In this study, the catalyst load variation was also carried out which also increased the conversion to 60.53% with 5% catalyst load. Based on these results, it shows that the activation process has more effect on glycerol conversion compared to the impregnation process. In addition, the catalyst load in ketalization is also able to increase the conversion of glycerol.]]>
<![CDATA[Analysis of Automatic Voltage Regulator (AVR) Performance Based on Commissioning Load Acceptance and Load Rejection Data at 28 MW Capacity Steam Power Plant ]]>
<![CDATA[Winarto, Agung Tri]]>;
<![CDATA[Sunardi, Sunardi]]>;
<![CDATA[Sutikno, Tole]]>
<![CDATA[ Jurnal Teknologi Vol 16, No 2 (2024): Jurnal Teknologi ]]>
Publisher : <![CDATA[Fakultas Teknik Universitas Muhammadiyah Jakarta ]]>
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DOI: 10.24853/jurtek.16.2.275-282
<![CDATA[As the load changes, the voltage produced by the generator will always change due to the fluctuating load. The output voltage must be kept constant within the desired value to ensure the supply of generator output power in order to meet the needs of the load, then a device called AVR (Automatic Voltage Regulator) is needed. AVR aims to regulate the amount of excitation current supplied to the generator and the amount of excitation current is directly proportional to the amount of voltage produced by the generator. This study aims to analyze the performance of AVR in maintaining the stability of voltage and generator output power at 28 MW Steam Power Plant. Monitoring the performance of the AVR installed on the generator is carried out during commissioning and testing. The test results and analysis after the generator is installed AVR can be seen that the output voltage is in stability with a variation value between 5% of the nominal output voltage value of 11 KV, which shows the success of installing AVR to stabilize the output voltage remains constant and can meet the needs of the load.]]>
<![CDATA[Glycosylation Gap in type II diabetes mellitus patients with vitamin D deficiency ]]>
<![CDATA[Alkataan, Muhammad A. Ahmed]]>;
<![CDATA[Ibrahim, Hayder F.]]>;
<![CDATA[Altai, Alaa]]>
<![CDATA[ Jurnal Teknologi Vol 16, No 2 (2024): Jurnal Teknologi ]]>
Publisher : <![CDATA[Fakultas Teknik Universitas Muhammadiyah Jakarta ]]>
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DOI: 10.24853/jurtek.16.2.187-194
<![CDATA[Diabetes mellitus represents a major health problem worldwide. DMis usually associated with hypovitaminosis D. Glycosylation is a non-enzymatic process associated with hyperglycemia. This work aims to explore the changes in glycosylation gap and VDR gene expression in type II DM patients with different vitamin D (vit. D) status in Mosul Province. This study recruit 300 subjects visiting Orkida's private laboratory for general screening tests. From May 2020 to August 2021, Only 80 of them fit the inclusion criteria of this work. They were divided into four groups of twenty each Serum fructosamine assay using the NBT-spectrophotometric methods12 and Vit D level estimation by using VIDAS® 25 OH Vitamin D Total - BIOMERIEUX using the Enzyme-Linked Fluorescent Assay (ELF) technique. Cells used for VDR qPCR analysis. The results of this work shows significant reduction in vitamin D levels between the three tested groups (p<0.05) in comparison to control. The glycosylation gap showed a significant elevated in all groups in comparison to the control-group (p<0.01). significant reduction was noticed in VDR expression in all groups in comparison to the control-group was noticed. VDR expression significantly reduced with elevation in glycosylation gap in both normoglycemic with low Vit D and type II diabetic with sufficient and insufficient vit D group.]]>
<![CDATA[Fuel Consumption in an Organic Fertilizer Processing Machine ]]>
<![CDATA[Asbanu, Husen]]>;
<![CDATA[Chan, Yefri]]>;
<![CDATA[Esye, Yendi]]>;
<![CDATA[Faturachman, Danny]]>;
<![CDATA[Rahardja, Istianto Budhi]]>
<![CDATA[ Jurnal Teknologi Vol 16, No 2 (2024): Jurnal Teknologi ]]>
Publisher : <![CDATA[Fakultas Teknik Universitas Muhammadiyah Jakarta ]]>
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DOI: 10.24853/jurtek.16.2.233-240
<![CDATA[The demand for organic fertilizer is crucial for small-scale farming businesses, particularly when compared to chemical fertilizers, which are expensive and negatively affect long-term soil fertility. This study aims to determine the specific fuel consumption requirements for gasoline engines used in organic fertilizer processing machines based on the workload applied to the engine. The research compares the actual specific fuel consumption and fuel consumption times for three types of gasoline, RON 90, RON 92, and RON 98, under an engine operating load of 3 kg. The results show that for a 3 kg load, the specific fuel consumption is 10 milliliters for RON 90, 35 milliliters for RON 90, and 25 milliliters for RON 92. The time savings for operating under a 3 kg load are 2.91 minutes with RON 90, 1.99 minutes with RON 92, and the lowest time savings of 0.92 minutes with RON 98.]]>
<![CDATA[Design Of A Job Scheduling Data Structure For Grid Resources ]]>
<![CDATA[Pujiyanta, Ardi]]>;
<![CDATA[Noviyanto, Fiftin]]>
<![CDATA[ Jurnal Teknologi Vol 16, No 2 (2024): Jurnal Teknologi ]]>
Publisher : <![CDATA[Fakultas Teknik Universitas Muhammadiyah Jakarta ]]>
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DOI: 10.24853/jurtek.16.2.283-290
<![CDATA[Essentially, Grid computing is an infrastructure that offers high-speed computing capacity in a distributed system by utilizing geographically distributed resources. Grid resources are owned by different organizations and have their own policies and access models. Scheduling future jobs in a grid system requires a data structure capable of handling parallel jobs, known as the Message Passing Interface (MPI). A data structure model needs to be proposed to minimize search time, and efficiently add and remove MPI jobs. Data structures that support future scheduling models will improve resource utilization efficiency. This research proposes a data structure capable of handling future MPI job scheduling to increase resource utilization. Experimental results on the data structure show that the average memory consumption of the FCFS-LRH data structure is lower than that of FCFS and FCFS-EDS. For average empty timeslot searches, FCFS-LRH is faster than FCFS-EDS but slower than FCFS. The average data insertion speed of FCFS-LRH is faster than that of FCFS-EDS.]]>
<![CDATA[Effectiveness of Quercetin in Kenikir Leaves (Cosmos Caudatus Kunt) in Nanoemulsion Formulas with VCO (Virgin Coconut Oil) and Olive Oil Phase ]]>
<![CDATA[Hajir, Siti]]>;
<![CDATA[Nugrahani, Ratri Ariatmi]]>;
<![CDATA[Ismiyati, Ismiyati]]>
<![CDATA[ Jurnal Teknologi Vol 16, No 2 (2024): Jurnal Teknologi ]]>
Publisher : <![CDATA[Fakultas Teknik Universitas Muhammadiyah Jakarta ]]>
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DOI: 10.24853/jurtek.16.2.195-202
<![CDATA[Kenikir (Cosmos Caudatus Kunth) is a herbal plant and contain quercetin compounds (flavonoids) which can have an effect as an antioxidant, antibacterial, antifungal, anti-inflammatory. This study aims to determine the effect of adding quercetin extract to a nanoemulsion formula with several oil phases, namely VCO (Virgin Coconut Oil) and Olive Oil. Evaluation of the characteristics of the preparation for each formula included organoleptic test, pH test, particle size, emulsion type, and determination of the level of quercetin absorbed in the nanoemulsion system as well as antioxidant activity test using the DPPH (1,1-diphenyl-2-picrylhydrazil) method. The results showed that the nanoemulsion preparations with the VCO oil phase, olives had good and stable characteristics. The pH test of the nanoemulsion was in the range of 4.5-6.5 while for the emulsion type it was an Oil in Water (M/A) type and the particle size was in accordance with the criteria for nanoemulsion preparations <200 nm, namely 13-178 nm. To see the ability of the active substance to be absorbed in the formula by calculating the % EE (Entrapping Efficiency) the % EE is obtained, which is 99%, which means that the nanoemulsion formula is able to absorb the active substance well and the antioxidant activity test using the DPPH method shows in the formulation of kenikir extract with the VCO oil phase gives an IC50 value of 52.238 ppm while the olive oil phase is 305.783 so that the nanoemulsion formula with the VCO oil phase is more reactive than the olive oil phase.]]>
