Jurnal IPTEK https://jurnaliptek.iti.ac.id/index.php/jii Versi elektronis dari Jurnal Ilmu Pengetahuan dan Teknologi (IPTEK) Institut Teknologi Indonesia Institut Teknologi Indonesia en-US Jurnal IPTEK 0852-7318 The copyright for articles in this journal are retained by the author(s), with first publication rights granted to the journal. By virtue of their appearance in this open access journal, articles are free to use with proper attribution in educational and other non-commercial settings. Implementation of Lean Manufacturing and Kaizen to Improve Productivity in The Production Floor https://jurnaliptek.iti.ac.id/index.php/jii/article/view/166 <p><span class="fontstyle0">Currently the industry is trying to improve its competitiveness. This makes the manufacturing<br />industry needs to adapt the Lean-Kaizen concept. Lean-Kaizen means eliminating waste through small improvements made on an ongoing basis. This research takes a case study at PT Inoac Poltechno Indonesia, which is engaged in foam production. The current production target is only 56% of the planned target. Besides that, there are found many defective products and activities that have no added value. Furthermore, a map of the current condition is made to find waste and know the kaizen that will be carried out. Furthermore, a future map was developed with work standardization and Value Stream Mapping to determine activities that have no added value. Calculation of Waste Assessment Model (WAM), shows the biggest waste is defect (26.73%), inventory (15.79%), and waiting (13.35%). This study found that by adding trolley, adding operators, making SOPs, scheduling engine maintenance would make non-value added (NVA) activities decrease from 29.95% to 20.5%. Process Cycle Efficiency increased from 22.31% to 28.25% (thus fulfilling international PCE requirements for the manufacturing industry).</span></p> <p><strong>Keyword</strong> : Lean-Kaizen, productivity, waste</p> Linda Theresia Gadih Ranti Ray Kreshna Copyright (c) 2020 Linda Theresia, Gadih Ranti, Ray Kreshna 2020-08-02 2020-08-02 4 2 10.31543/jii.v4i2.166 Benefits of Implementing AON (Activity On Node) Method for Scheduling High-rise Building Project https://jurnaliptek.iti.ac.id/index.php/jii/article/view/165 <p><em>The construction project is assessed based on the realization of the construction according to the quality, time and cost in the planning document. To monitor implementation, a scheduling method is needed that can describe the relationship between activities and implementation time, so that the work can be completed according to the target duration specified in the construction contract. Two methods are known in scheduling critical paths, namely Activity On Arrow (AOA) and Activity On Node (AON) where AOA is more widely used in projects, whereas AON has the advantage of 4 relationships between activities with activity symbols on the box, while AOA is only 1 type with symbol of the activity on the arrow. The purpose of this study is to obtain the benefits of using AON rather than AOA by scheduling using the two methods on the schedule of the construction of a high-rise building in Banten, using Microsoft Project (MS Project) software, and analyzing the differences. In MS Project AOA is known as the Activity Diagram Method and AON with the Precedence Diagram Method. From the comparative analysis results obtained that with AOA obtained 74 activities and 48 activities with AON with the same duration and critical activities in both methods. The AON diagram can better illustrate the relationship between activities that are simpler and simpler with a total efficiency of 35%.</em></p> <p><strong>Keyword</strong>: AOA, AON, relationship between activities, scheduling method</p> rachmi yanita Intan F Ningrum Krishna Mochtar Copyright (c) 2020 rachmi yanita, Intan F Ningrum, Krishna Mochtar 2020-08-02 2020-08-02 4 2 10.31543/jii.v4i2.165 Application of Six Sigma and Design of Experiment for Improving the Quality of the Tetoron Cotton Fabric Process (Case Study in Textile Company) https://jurnaliptek.iti.ac.id/index.php/jii/article/view/167 <p><span class="fontstyle0">Improvement of Textile Industry system design with Six Sigma and FMEA to improve process quality. Six Sigma is a method of continuous quality improvement, by minimizing the number of defects. FMEA (Failure Mode Effect Analysis) tool is used to help determine the appropriate action, eliminating priority failure modes. The next step to improve to determine the most influential factor to the occurrence of color defects, so that the influence of the interference factor is minimum. If the control function is carried out and the factors causing the defect do not appear again there will be an increase in sigma value. FMEA analysis results obtained by machine temperature and material factors that most influence the occurrence of color defects, with RPN values of 210 and 120 respectively, the Six Sigma calculation results an increase in sigma value from initial conditions of 3.78 sigma to 4.93 sigma, or an increase in process capability of 1.15 sigma. Proposed improvements with DOE so that color defects do not appear are suggested by setting the thermosol engine temperature control device and mixing the optimized NaCl.</span></p> <p><span class="fontstyle0"><strong>Keyword</strong> : Six Sigma, FMEA, DOE</span></p> Ni Made Sudri Yenny Widianty Anissa Fernanda Copyright (c) 2020 Ni Made Sudri, Yenny Widianty, Anissa Fernanda 2020-08-02 2020-08-02 4 2 10.31543/jii.v4i2.167 Performance of Egg Shell Biosorbent as Cr Heavy Metal Extractor in Industrial Liquid Waste https://jurnaliptek.iti.ac.id/index.php/jii/article/view/164 <p><em>In industrial processing, side products are produced in the form of liquid waste containing heavy metals, including Cr (III) which can have a negative impact on the environment. Some egg shell characteristics containing high concentrations of CaCO<sub>3</sub> and have a natural pore structure can be used as adsorbers (biosorbents) of heavy metals produced by the processing industry. The purpose of this study was to obtain the optimum conditions of absorption (adsorption) of Cr (III) metals carried out by egg shell biosorbents. The research method was carried out experimentally which included the preparation of egg shell waste biosorbents, determining the optimum time, as much as 1.0 gram of eggshell biorsorbent was put into 25 ml of heavy metal waste solution with a concentration of 50 ppm, then adsorption was carried out with time variations of 5, 10, 20 , 30, 40, 50, 60 and 120 minutes. Variation of Cr concentration were 50,0 ppm; 100,0 ppm, 150,0 ppm; 200,0 ppm; 250,0 ppm; 300,0 ppm; 350,0 ppm, 400,0 ppm; 450,0 ppm; 500,0 ppm; dan 1000 ppm. After that the mixture is filtered and the filtrate is read on the Atomic Absorption Spectrophotometer (AAS) to find out the maximum adsorption. The results showed the optimum conditions of adsorption of Cr (III) metals obtained an optimum time of 40 minutes with an absorption capacity of 1242.46 µg Cr (III) / g biosorbent, and optimum concentration with optimum treatment time and weight at 200 ppm with an absorption capacity of 4984 , 99 µg Cr (III)/g biosorbent. The adsorption isotherm adopts the Freundlich isotherm or physically (physical) type, because the linearity of the Freundlich isotherm obtained from the calculation results is R2 = 0.7312 or 73.12% higher than the Langmuir isotherm ie R2 = 0.0335 or 3.35%.</em><strong> </strong></p> <p><strong>Keyword</strong> : Cr (III) heavy metal, eggshell biosorbent, optimum adsorption conditions</p> Syahril Makosim mohamad haifan Eka Indra Setiaman Copyright (c) 2020 Syahril Makosim, mohamad haifan, Eka Indra Setiaman 2020-08-02 2020-08-02 4 2 10.31543/jii.v4i2.164 Analisis Fundamental Saham Sektor Food and Beverage pada LQ45 Periode I Tahun 2020 https://jurnaliptek.iti.ac.id/index.php/jii/article/view/168 <p align="justify"><span class="fontstyle0">For beginners, to start investing should have careful consideration. Investment objectives, time period, risk are things that must be considered, and the most important is what investment instruments are suitable and we will choose later, of course, to achieve the objectives of the investment itself, namely future profits. Some investment instruments that have the advantages that have been summarized by the Indonesia Stock Exchange as of December 29, 2017 include, Savings (2.53%), government bonds (8.96%), gold (7.30%), deposits (7.36) %), and shares (13.13%).Technical and fundamental analysis are two analyzes that are often used to analyze stock movements. Technical analysis is an analysis that predicts future stock prices using historical prices. Whereas fundamental analysis is an analysis that uses information inside and outside the company, such as performance, business competitors, industry and even micro-macroeconomics, as well as</span> <span class="fontstyle0">market information. Fundamental analysis is generally used by long-term investors, so the sustainability of the company is a very important consideration.Common indicators in Fundamental Analysis are EPS (Earning Per Share), PER (Price Earning ratio), PBV (Price Book Value), ROE (Return of Equity), Dividend Yield, and DER (Debt Earning Ratio). From the fundamental analysis using the 2019 financial statements of food and beverage sector companies in LQ45 with EPS, PER, PBV, ROE, DY, and DER indicators the best performance is on UNVR company shares, because almost all indicators occupy good positions except DER indicators because UNVR has a high DER, then followed by JPFA, ICBP, and INDF.</span></p> <p align="justify"><span class="fontstyle0"><strong>Keyword:</strong> investment, fundamental analysis, EPS (Earning Per Share), PER (Price Earning Ratio), PBV (Price Book Value), ROE (Return of Equity), Dividend Yield, and DER (Debt Earning Ratio)</span></p> Annuridya Octasylva Faisal Fachroji Copyright (c) 2020 Annuridya Octasylva, Faisal Fachroji 2020-08-02 2020-08-02 4 2 10.31543/jii.v4i2.168