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Data Mining: The Classification Method to Predict the Types of Motorcycle Spare Parts to be Restocked

IOP Conference Series: Materials Science and engineering 2019年第2期662卷

作者： S L B Ginting Y R Ginting Sutono A Rakhman Computer System Study Program Faculty of Engineering and Computer Science Universitas Komputer Indonesia Jl. Dipati Ukur 112-116 Bandung 40132 Indonesia Department of Mechanical Engineering Universitas Riau Kampus Bina Widya KM 12 5 Simpang Baru Pekanbaru 28293 Indonesia

The research intends to create an application which is able to analyse sales data in a motorcycle company to predict the types of spare parts which should be stocked. This prediction is crucial since problems are often encountered while restocking. For instance, when there have been some imprecisions occurring in deciding regarding the types of spare parts to restock, the spare parts accumulate. It can cause inefficiency in terms of storage, the products quality deteriorates due to having been stored for too long, and sometimes the best-selling products are not available in the warehouse. This application is developed with Naïve Bayes Classifier (NBC) method which has a high accuracy in predicting future occurrences. This method works by calculating the probability value in each attribute class and determining the optimal probability value. From the test results, 4500 training data with 200 sample test data has 90% similarity with the results of the restock decision without application. For 500 test data, the similarity was 96%. It is proven that this method has a high accuracy so that it can help the decision makers solved the company problem in predicting the types of motorcycle parts to be restocked.

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The effects of magnesium sulphate addition into foaming agents resulted from palm oil fatty acid saponification in the performance of peat fire suppression

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IOP Conference Series: Earth and Environmental Science 2020年第1期460卷

作者： P Subekti E Hambali A Suryani P Suryadarma B H Saharjo M Rivai Post Graduate Student Study Program Agroindustrial Technology IPB University Bogor Indonesia Study Program of Mechanical Engineering Pasir Pengaraian University Regency of Rokan Hulu Riau Indonesia Department of Agroindustrial Technology IPB University Bogor Indonesia Surfactant and Bioenergy Research Center IPB University Bogor Indonesia Forest Fire Laboratory Division of Forest Protection Department of Silviculture IPB University Bogor Indonesia

The utilization of foaming agents resulted from the saponification of palm oil fatty acids as foam concentrate on peat fire suppression leads to less water use and a shorter time compared to the use of peat water only. The development of foaming agents for a peat fire extinguisher, including the addition of 0.2% magnesium sulfate (MgSO4), was further conducted in order to improve the performance of the liquid foam. This study aims to determine the performance of the developed foaming agent (FAP-MS) applied in peat fire suppression. In order to assess the performance of FAP-MS, two controls namely palm fatty acid-based foaming agent without the addition of magnesium sulfate (FAP) and peat water with no mixture of foaming agents were used. Results showed that the durability of foam produced from the peat water solution mixed with FAP-MS was lower than the foam produced from the peat water solution mixed with FAP. The addition of FAP-MS into peat water solution was found to reduce the use of water by 27% and the addition of FAP reduced it further by 35%. However, compared to peat water with no foaming agent addition, FAP-MS and FAP additions were able to suppression peat fires faster by 79% and 65%, respectively.

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Four-scroll chaotic attractor and four-scroll hyperchaotic attractor generated from a new four-dimensional dynamical system

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Journal of Physics: Conference Series 2021年第1期1764卷

作者： Khaled Benkouider Toufik Bouden Mustak E. Yalcin Aceng Sambas Mujiarto Muhamad Ali Pahmi Akhmad Sutoni Widjajani Non Destructive Testing Laboratory Automatic Department Jijel University Algeria Department of Electronics and Communication Engineering Istanbul Technical University Turkey Department of Mechanical Engineering Universitas Muhammadiyah Tasikmalaya Indonesia Department of Industrial Engineering Sekolah Tinggi Teknologi Cileungsi Indonesia Department of Industrial Engineering Universitas Suryakancana Cianjur Indonesia Industrial Engineering Study Program Universitas Langlangbuana Bandung Indonesia

In this paper, a new 4-D hyperchaotic system with one equilibrium point is first introduced. It contains ten terms with three quadratic nonlinearities. Of particular interest is that this novel system can generate periodic attractor, quasi-periodic attractor, four-scroll chaotic attractor and four-scroll hyperchaotic attractor with the variation of one of its parameters. Major dynamical properties of the new system are investigated such as sensitivity to the initial conditions, dissipativity, equilibrium point stability, Kaplan-Yorke dimension, Lyapunov exponents spectrum and bifurcation diagram. In addition, an equivalent electronic circuit schematic is implemented using Multisim software; the obtained results confirm the feasibility of the proposed system.

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The Prospect of Geotourism in the Cycloop Mountains Conservation Area Papua

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IOP Conference Series: Earth and Environmental Science 2022年第1期950卷

作者： P Setiadji B Sulistyantara B Pramudya Suwardi Student of Natural Resources and Environmental Study Program Graduate School of IPB Lecturer of Department of Landscape Architecture Faculty of Agriculture IPB Lecturer of Department of Mechanical and Biosystem Engineering Fateta IPB Lecturer of Department of Soil Science and Land Resources Faculty of Agriculture IPB

The Cycloop mountains in Papua are a nature reserve conservation area that has diverse geology, biology and culture. This paper discusses the prospects of geotourism in Cycloop mountains based on a method of analyzing the community acceptability and tourists preferences, likewise the geosite attraction and geotourism sustainability. The results of analysis indicates that a) village communities in surrounding conservation area accept and wish to get involved in natural activities; b) local tourists are very dominant and motivated on outdoor recreation in groups; c) identified geosites has classified as from Quite Interesting to Interesting based on the index of attractiveness; and d) geotourism activity in the mountains Cycloop is categorized Quite Sustainable reviewed from the environment, society, economy and governance dimension. The exploration and the geological conservation to be the reliable activities in organizing the geotourism. Geotourism is likely to be applied to the conservation area as a form of implementation of the sustainable tourism concept.

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Analysis of Porosity Defects in Aluminum as Part Handle Motor Vehicle Lever Processed by High-pressure Die Casting

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IOP Conference Series: Materials Science and engineering 2018年第1期367卷

作者： L. Anggraini Sugeng Faculty of Engineering President University Jalan Ki Hajar Dewantara Jababeka Education Park Cikarang Baru Bekasi 17550 Indonesia. Undergraduate Study Program of Mechanical Engineering President University Jalan Ki Hajar Dewantara Jababeka Education Park Cikarang Baru Bekasi 17550 Indonesia.

This research discusses the testing and analysis of cracking Aluminum (Al) material. Al as a handle lever was used for a braking device on a motor vehicle. Cracking of handle lever due to the part content of porosity from hydrogen gas. The existence of the H2 can be caused by the casting process and dies design that is less perfect, especially at the gate or brisket and overflow. This research is to optimize the process of making Al part handle lever, and the construction dies by following the standard. The results of these improvements were reevaluated through the chemical and mechanical testing properties stages, such as density test and tensile test on the workpiece as part handle lever. The loads on the tensile test are 25 kg and 35 kg, and the tensile test result has met the standard set by the motor vehicle company. The optimization result has the porosity defect can be reduced by 99 %. Therefore the best part handle lever can be produced.

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Steady Rayleigh-BénardRayleigh-Bénard convection between stress-free boundaries

arXiv

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arXiv 2020年

作者： Wen, Baole Goluskin, David LeDuc, Matthew Chini, Gregory P. Doering, Charles R. Department of Mathematics University of Michigan Ann ArborMI48109-1043 United States Department of Mathematics & Statistics University of Victoria VictoriaBCV8P 5C2 Canada Department of Physics University of Michigan Ann ArborMI48109-1040 United States Program in Integrated Applied Mathematics University of New Hampshire DurhamNH03824 United States Department of Mechanical Engineering University of New Hampshire DurhamNH03824 United States Center for the Study of Complex Systems University of Michigan Ann ArborMI48109-1042 United States

Steady two-dimensional Rayleigh-Bénard convection between stress-free isothermal boundaries is studied via numerical computations. We explore properties of steady convective rolls with aspect ratios π/5 ⩽ Γ ⩽ 4π, where Γ is the width-to-height ratio for a pair of counter-rotating rolls, over eight orders of magnitude in the Rayleigh number, 103 ⩽ Ra ⩽ 1011, and four orders of magnitude in the Prandtl number, 10−2 ⩽ Pr ⩽ 102. At large Ra where steady rolls are dynamically unstable, the computed rolls display Ra → ∞ asymptotic scaling. In this regime, the Nusselt number Nu that measures heat transport scales as Ra1/3 uniformly in Pr. The prefactor of this scaling depends on Γ and is largest at Γ ≈ 1.9. The Reynolds number Re for large-Ra rolls scales as Pr−1Ra2/3 with a prefactor that is largest at Γ ≈ 4.5. All of these large-Ra features agree quantitatively with the semi-analytical asymptotic solutions constructed by Chini & Cox (2009). Convergence of Nu and Re to their asymptotic scalings occurs more slowly when Pr is larger and when Γ is smaller. Copyright © 2020, The Authors. All rights reserved.

关键词： Prandtl number

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Preparation Of Superhydrophobic Zinc Oxide Nanorods Coating On Stainless Steel Via Chemical Bath Deposition

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IOP Conference Series: Materials Science and engineering 2019年第1期547卷

作者： Ahmad Nuruddin Brian Yuliarto Santi Kurniasih Henry Setiyanto Aditianto Ramelan Engineering Physics Research Group Faculty of Industrial Technology Institut Teknologi Bandung Bandung 40132 Indonesia Materials Engineering Study Program Faculty of Mechanical and Aerospace Engineering Institut Teknologi Bandung Jalan Ganesha 10 Bandung 40132 Indonesia Analytical Chemistry Research Group Faculty of Mathematics and Sciences Institut Teknologi Bandung Bandung 40132 Indonesia

The stearic acid modified zinc oxide nanorod surface was coated with a stainless steel substrate to improve the contact angle and the sliding angle. Facilitated through ZnO seeding on the substrate, the ZnO nanorod was deposited via chemical bath deposition at different precursor concentrations. The surface hydrophobicity was modified by varying concentrations of stearic acid at and submmersion time. The contact angle was investigated in relation to the surface microstructure and modification. Results indicate that the density of ZnO nanorods on the substrate surface and stearic acid coverage are prerequisites for improving surface hydrophobicity. Superhydrophobic properties with a contact angle of 162° was obtained for ZnO deposited with 35 mM zinc nitrate and submerged in 8 mM stearic acid for 36 h, which allowed 5 μL water droplets to slide at 3.8°.

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Effect of vegetable oils as cutting fluid on wear of carbide cutting tool insert in a milling process

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IOP Conference Series: Materials Science and engineering 2020年第1期796卷

作者： Arya R. Nasution Z. Fuadi I. Hasanuddin R. Kurniawan University of Muhammadiyah Sumatera Utara Jalan Kapten Mukhtar Basri No.3 Medan Indonesia Graduated Study Program Department of Mechanical Engineering Universitas Syiah Kuala Jl. Tgk. Syech Abdurrauf No. 7 Darussalam Banda Aceh Indonesia

This research focusses on the effect of vegetable oils, i.e. crude palm oil (CPO) and coconut oil (CO), used as the cutting fluid on the wear of carbide cutting tool insert in a face milling process. The performances of the tool, in term of wear and the surface roughness of the workpiece, were investigated and compared to those resulting from a similar milling process but using conventional cutting fluid, which is a commercial soluble oil emulsion (SOE). The results show that at the spindle speed of 360 rpm and the feed rate of 80 mm/min, the tool wear was smaller in the case of CO than that in the case of CPO cutting fluid, which is 0.16 mm2 compared to 0.40 mm2, respectively. The tool worn area in these cases are still larger than that in the case of SOE, which is 0.09 mm2. However, at higher spindle speed of 490 rpm and feed rate of 80 mm/min, the smallest tool worn area occurred for the case of CO cutting fluid, which is 0.04 mm2, compared to 0.1 mm2 and 0.11 mm2 for the case of CPO and SOE cutting fluids, respectively. As for the workpiece, the achieved surface roughness, Ra, were relatively similar for all the evaluated cases.

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The Development of Bank Application for Debtors Selection by Using Naïve Bayes Classifier Technique

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IOP Conference Series: Materials Science and engineering 2018年第1期407卷

作者： S L B Ginting J Adler Y R Ginting A H Kurniadi Computer System Study Program Universitas Komputer Indonesia Jl. Dipati Ukur 112-116 Bandung 40132 Indonesia Department of Mechanical Engineering Universitas Riau Kampus Bina Widya KM 125 Simpang Baru Pekanbaru 28293 Indonesia

The purpose of this study is to create an application that functions automatically with high accuracy when analyzing bank customer data. This needed due to non-performing loans occurring frequently caused by the inaccuracy of credit analysts in the assessment of creditworthiness. This can be seen in the incident occurred in a public bank located in Bandung. This bank does not have the database that serves to accommodate data history and the method used in assessing creditworthiness is merely based on the simple statistical analysis. This leads to reduced accuracy and speed in the decision-making process. This research applies Naïve Bayes Classifier (NBC) method, a Data Mining technique. This helps credit analysts to select customers who are truly eligible to be given credit so that non-performing loan can be avoided. NBC calculates the probability of one class from each group of attributes and determines which class is most optimal. The accuracy of the NBC sampling test from 500 data is 95% compared to the decision made by a credit analyst. It can be concluded that this application is very helpful for credit analysts in recommending customers who are eligible for a loan to the bank's decision maker.

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The Tensile Strength of Petung Bamboo Fiber Reinforced Epoxy Composites: The Effects of Alkali Treatment, Composites Manufacturing, and Water Absorption

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IOP Conference Series: Materials Science and engineering 2019年第1期547卷

作者： Gunawan Refiadi Yusi Syamsiar Hermawan Judawisastra Mechanical Engineering Vocational Education Study Program College of Teacher Training and Education (STKIP) Sebelas April Jl. Anggrek Situ 10 Sumedang 45323 Indonesia Textile Chemistry Department Polytechnic of Textile Technology Jl. Jakarta 31 Bandung 40272 Indonesia Material Engineering Department Faculty of Mechanical and Aerospace Engineering Bandung Institute of Technology (ITB) Jl. Ganesha 10 Bandung 40132 Indonesia

Natural fiber application due to its competitiveness attracted many research in green composites. However, the tensile properties of natural fiber composites might be influenced by several factors such as treatment of the fibers, manufacturing processes, and water absorption levels. In this research, we use petung bamboo fibers as natural fibers candidate for a good reinforcement in green composites. The study focused on the tensile property of bamboo fiber reinforced epoxy composites due to alkali treatment, manufacturing process, and water absorption. The composites were made with three variations: the fibers were varied without and with alkaline treatment (5% NaOH); manual lay-up method and hot press were applied as manufacturing variation; moisture content in the composites was varied in dry condition and after water absorption treatment. Tensile testing and Scanning Electron Microscope (SEM), were performed to improve tensile strength of composite and fiber-matrix interface quality. The alkali treatment has less effect to the tensile strength than of the volume fraction gain and the void content. Composite manufacturing by hot press has a significant effect to the improvement of tensile strength up to 37% compare to the hand lay-up method. Water absorption up to 8.8% had decreased the tensile strength of composites up to 29%. The alkali treatment on the bamboo fibers had effectively reduced water absorption into the composite as well as the tensile strength reduction.

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