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1st Paris Van Java International Seminar on Computer, Science, engineering, and Technology, PVJ ISComSET 2020

作者： Rusyn, Volodymyr Mujiarto Mamat, Mustafa Azharul, Firmansyah Mada Sanjaya, W.S. Sambas, Aceng Dwipriyoko, Estiyan Sutoni, Akhmad Yuriy Fedkovych Chernivtsi National University Kotsybynsky str. 2 Chernivtsi58012 Ukraine Department of Mechanical Engineering Universitas Muhammadiyah Tasikmalaya Indonesia Faculty of Informatics and Computing Universiti Sultan Zainal Abidin Kuala Terengganu Malaysia Department of Mechanical Engineering Sekolah Tinggi Teknologi Cileungsi Indonesia Department of Physics Universitas Islam Negeri Sunan Gunung Djati Bandung Indonesia Informatics Study Program Universitas Langlangbuana Bandung Indonesia Department of Industrial Engineering Universitas Suryakancana Cianjur Indonesia

This paper presents computer modeling, analysis and research of the hyper-chaotic Lorenz system based on programming interface that has been developed in LabView software environment. This study allows for generating and research of the main information properties of hyper-chaotic Lorenz system, focusing on time distribution of the four chaotic coordinates, phase portraits and Lyapunov exponents. The programming interface demonstrates the algorithm of masking and decrypt of the information carrier. © Published under licence by IOP Publishing Ltd.

关键词： Lyapunov methods

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Characteristic of beef tallow/rice husk charcoal/plaster composite phase change materials

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AIP Conference Proceedings 2023年第1期2568卷

作者： I. Made Astika I. Nyoman Suprapta Winaya I. Ketut Gede Wirawan Akhmad Herman Yuwono I. Dewa Gede Ary Subagia 1Doctoral Study Program of Engineering Science Faculty of Engineering Udayana University Kampus Sudirman Denpasar Bali 80234 Indonesia. 2Study Program of Mechanical Engineering Faculty of Engineering Udayana University Kampus Bukit Jimbaran Badung Bali 80361 Indonesia 3Department of Metallurgy and Materials Engineering Faculty of Engineering Universitas Indonesia Kampus Baru UI Depok Depok 16424 Indonesia

Composite materials are a combination of several materials to form a new material with specific properties. Chemical compatibility of the constituent materials is a factor that affects the characteristics of composite materials. Currently, composite phase change materials (PCM) are commonly applied as thermal energy storage systems. This study investigated the characteristics of beef tallow/rice husk charcoal/plaster PCM composite. The weight fraction of rice husk charcoal used was 10%. To prevent leakage of beef tallow from the composite structure, the researcher used polyvinyl acetate (PVAc) to cover the tallow/RHC composite before mixing it with plaster material. As much as 30% of the tallow/RHC/PVAc composite weight fraction is integrated into the plaster. PCM composite was made by using a direct incorporation method. The FTIR test results on the PCM composites produced showed good chemical compatibility among different components. The scanning electron microscope results showed the formation of microcapsules where the rice husk charcoal and polyvinyl acetate functions as a wrapper/capsule for beef tallow. This composite is suitable for application in building walls as thermal energy storage.

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Simulation of model landslides observation in laboratory used by IoT

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AIP Conference Proceedings 2023年第1期2609卷

作者： Made Sutha Yadnya I. G. P. Wedashwara Wedarama I. Wayan Sudiarta 1Electrical Engineering Communication Laboratory Engineering Faculty University of Mataram Mataram Indonesia 2Informatics Engineering Faculty of EngineeringUniversity of Mataram Mataram Indonesia 3Physic Study Program Faculty of Mathematics and Natural Science University of Mataram Mataram Indonesia

This paper is collaboration between BMKG and the University of Mataram to mitigate land slide. For this study using light intensity sensors, air temperature sensors, voltage sensors, current sensors, humidity sensors. This research is on a laboratory scale with a soil slope of 10 degrees, dry soil with a tendency to split (clay) from brittle volcanic rocks. The initial conditions were without rain, then the soil was burdened with rain in low (drizzle), medium (25mm/h) and high (55mm/h) capacities. The second condition of the stage is given a vibration which is a model of the earthquake evenly on that stage. Soil Moisture soil, soil temperature, 3 pieces of vibration sensor switch, piezo electric vibration sensor. The initial height of the soil is 36.78 cm with a width of 79.35cm after being rained for 90 minutes, the final height is 29.93 and 60.25 cm, widening receding to the right and left sides.

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Canopy cover estimation based on support vector regression derived from Lidar & Landsat 8 OLI 40

Canopy cover estimation based on support vector regression d...

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40th Asian Conference on Remote Sensing: Progress of Remote Sensing Technology for Smart Future, ACRS 2019

作者： Hudjimartsu, Sahid Tampinongkol, Felliks Rudianto, Yoga Setiawan, Yudi Prasetyo, Lilik Budi Forests2020 Programme Environmental Analysis and Spatial Modelling Laboratory Department of Forest Resource Conservation Faculty of Forestry Bogor Agricultural University Bogor West Java Indonesia Geoinformatic of Informatics Engineering Study Program Faculty of Engineering and Science Ibn Khaldun University Jalan KH Soleh Iskandar KM 2 Tanah Sereal Bogor West Jawa Indonesia

Light detection and ranging (LiDAR) provides geospatial information with massive amounts of data to use in a variety of applications. Canopy cover percentage of tree crown is one application that is estimated through LiDAR data. This study aims to estimate a canopy cover derived from LiDAR used as reference data with multispectral Landsat 8 OLI. Statistical or machine learning approaches can be used to estimate a canopy cover. In statistical inference, the form of distribution chosen by the analyst and parameter is estimated from the data. This will be a problem in the construction function for the National scale, due to many ecosystems and then will have many functions for each ecosystem. Machine learning (ML) methods, in contrast, are various kinds of algorithms that are used to learn the mapping function or classification rules inductively, directly from the training data. ML can solve problems related to big data and global method and it will be used as a methodical approach to estimate canopy cover on the National scale. In this study, we use a support vector regression (SVR) as ML method to estimate the canopy cover. The estimated percentage of canopy cover will be used as one of the parameters to classify a forest. © 2020 40th Asian Conference on Remote Sensing, ACRS 2019: "Progress of Remote Sensing Technology for Smart Future". All rights reserved.

关键词： Ecosystems

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An augmented reality-based science book for junior high school students: Case study on environmental pollution and global warming topics

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AIP Conference Proceedings 2023年第1期2569卷

作者： Erni Yulianti Vita Ria Mustikasari Nurhadi Muhlisin Nor Farahwahidah Abdul Rahman Fatin Aliah Phang 1School of Education Faculty of Social Sciences and Humanities Universiti Teknologi Malaysia 81310 Johor Bahru Johor Malaysia 2Study Program of Science Education Faculty of Mathematics and Natural Sciences Universitas Negeri Malang Malang Indonesia 3Centre for Engineering Education Universiti Teknologi Malaysia 81310 Johor Bahru Johor Malaysia

The digitalization in the 21st century has brought tremendous benefits in many aspects of human lives, including in education. It opens the door of observing the phenomena that are difficult to do in classrooms. As phenomena observation is a vital activity in learning science, the technology of augmented reality (AR) will help students digitally observe as many phenomena as possible during their learning process. In this study, a science book that is integrated with AR technology was developed. It aims to fill the gap in the literature of what components should be included in an AR-based science book, especially the learning resource that is suitable for STEAM education. The study was limited to environmental pollution and global warming topics. The results showed that the developed AR-based science book has met the eligibility criteria to be used in STEAM education. In terms of numerical viewpoint, the scores for the feasibility test were 96.09% and 97.65% respectively for the learning media and material validation. Therefore, the AR-based science book is considered as a valid learning resource from the expert assessment. In addition, teachers and students also showed positive perspectives towards the AR-integrated book.

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The J-value as the measurement tool of the bonds investor's behavior

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AIP Conference Proceedings 2021年第1期2331卷

作者： Josep Ginting Lydia Anggraini 1Study Program of Accounting Faculty of Business President University Jl. Ki Hajar Dewantara Jababeka Education Park Cikarang Baru Bekasi 17550 Indonesia 2Study Program of Mechanical Engineering Faculty of Engineering President University Jl. Ki Hajar Dewantara Jababeka Education Park Cikarang Baru Bekasi 17550 Indonesia

For many years, mathematics has been used to solve the problem in economic and finance instead of natural science and engineering. This paper shows how accurate mathematics reads financial behavior. One of the financial areas using the mathematics approach is the bond valuation technique. Bond is one of the long term debt instruments. The finding in this research is that mathematics can be used to read the changes in the concept of a pricing model where the par value of bonds is always going to 100% at the maturity date. Theoretically, the bonds fair price is resulted by calculating the present value of future coupon interest of bonds, but not in practice, caused by the bonds investor behavior. The difference in price, resulted from both different approaches, in this paper is defined by a new mathematical concept to reflect the bonds' investor behavior. It is the aim of this research. To address the differences, we have evaluated the fair price of bonds calculation by creating new mathematics equations by combining the calculation of the present value of future coupon interest of bonds with the market concept models. The result is a new mathematical model called J-Value. To prove the eligibility of J-Value, a simulation was done. The mathematics model in this paper is found by combining the usage of a qualitative method and supported by a quantitative method.

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The Indonesia high-speed train traveler preference analysis (case study: Jakarta-Bandung)

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AIP Conference Proceedings 2020年第1期2227卷

作者： Tri Tjahjono Andyka Kusuma Nuryani Tinumbia Ahmad Septiawan 1Department of Civil Engineering Faculty of Engineering Universitas Indonesia Kampus UI Depok Indonesia 2Study Program of Civil Engineering Faculty of Engineering Universitas Pancasila Serengseng Sawah South Jakarta Indonesia

This study assesses the potential passenger preference of the High-Speed Train infrastructure, which connects Jakarta – Bandung. The study aims to understand the potential HST passenger travel characteristics, which is important in predicting the HST demand. This study conducts a roadside interview using a stated preference methodology for several transport modes passenger serving Jakarta-Bandung, namely; private vehicle, train, intercity bus and paratransit. Moreover, the study extends in observing the short trip passenger preference. The analysis defines that the preferred fares are 300.000 (20 USD), which is increased compared to 2016 studies. The forecasting results of the demand for fast trains based on the probability of modal transfers amounted to 54,764 passengers per day with details of the number of trips Jakarta-Bandung was 27,005 while the Bandung-Jakarta trip was 27,759. The results for a significant difference between the total daily trips of Bandung-Jakarta and Jakarta-Bandung have already been seen since the initial statistical analysis where according to survey data, people who travelled Bandung-Jakarta were more elastic compared to Jakarta-Bandung trips. This finding shows clearly that the passenger traffic vehicle capitulates with the current road traffic highway conditions. Note that they are more uncertainty in condition on road traffic in comparison to the railway passenger. In more details, sensitivity analysis indicates that the passenger from Jakarta is more comfortable to shift using the HST compared to the passenger from Bandung. There is an indication that the Jakarta people have a higher value of time as they have a higher preference to shift toward faster transport mode compared to Bandung people. This information is also useful for operation policy, including ticketing differentiation based on the travel time period and travel origin-destination.

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Improving students’ mathematical problem-solving ability using differentiated instruction approach

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AIP Conference Proceedings 2022年第1期2468卷

作者： Ade Evi Fatimah Muhammad Daut Siagian Suwanto Fitry Wahyuni Azrina Purba 1Computer Informatics Engineering Education Study Program STKIP Al-Maksum Langkat Jl. Sei Batang Serangan Kwala Bingai Kec. Stabat Kabupaten Langkat Sumatera Utara 20811 Indonesia 2Mathematics Education Study Program Universitas Islam Sumatera Utara Jl. Sisingamangaraja Teladan- Medan Sumatera Utara 20217 Indonesia 3Mathematics Education Study Program STKIP Asy-Syafi’iyah Internasional Medan Jl. Karya Tani No. 1 Pangkalan Masyhur Kec. Medan Johor Kota Medan Sumatera Utara 20146 Indonesia 4Corporate Management Study Program Akademi Perniagaan dan Perusahaan APIPSU Medan Jalan Rasmi No. 28 Medan Sumatera Utara 20123 Indonesia 5Science Education Study Program STKIP Al-Maksum Langkat Jl. Sei Batang Serangan Kwala Bingai Kec. Stabat Kabupaten Langkat Sumatera Utara 20811 Indonesia

Problem-solving abilities are very important in mathematics, not only for those who will study mathematics in the future but also for those who will apply it in other fields of study and in everyday life because in the process of learning and solving it, students can gain experience using knowledge and skills already possessed to be applied in solving non-routine problems. This study aims to analyze and describe students' mathematical problem-solving abilities through the application of the Differentiated Instruction approach. This research is quantitative research with a quasi-experimental method. This research was conducted in one of the Vocational High Schools in Deli Serdang Regency, North Sumatra, for grade 10 students consisting of two classes, namely the control class and the experimental class, where each class consisted of 24 students. The sampling technique with cluster random sampling was used to collect data. Data collection is done by giving a test on trigonometry material. Data analysis was performed using a two-way ANOVA test. The results of this study indicate that the increase in mathematical problem-solving abilities of students who receive learning using the Differentiated Instruction approach is better than students who receive direct learning.

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Current studies of heat transfer enhancement on double pipe heat exchanger

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AIP Conference Proceedings 2020年第1期2248卷

作者： Mustaza Ma’a Tri Agung Rohmat Samsul Kamal 1Departement of Mechanical and Industrial Engineering Faculty of Engineering Universitas Gadjah Mada Jl. Grafika No 2 Yogyakarta 55281 Indonesia 2Study Program of Mechanical Engineering Departement of Industrial Technology Politeknik Caltex Riau Jl. Umban Sari No1 Pekanbaru – Riau 28265 Indonesia

This paper gives an overview of several published current studies concerning heat transfer enhancement on the double pipe heat exchanger. Since double pipe heat exchanger has drawn much consideration due to simplicity and wide-range utility. The flow manipulation technique to enhance heat transfer in a double pipe heat exchanger has been frequently cited. Also, various research addressing working fluid on a double pipe heat exchanger has been discussed in detail. Another technique is known as surface modification that has an infrequent investigation comparing the other techniques. Correlation of Nusselt number and pressure drop coefficient shown in this overview. Future research opportunities are mentioned.

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Computer Modelling of the Information Properties of Hyper Chaotic Lorenz System and Its Application in Secure Communication System

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

作者： Volodymyr Rusyn Mujiarto Mustafa Mamat Firmansyah Azharul W. S. Mada Sanjaya Aceng Sambas Estiyan Dwipriyoko Akhmad Sutoni Yuriy Fedkovych Chernivtsi National University Kotsybynsky str. 2 Chernivtsi 58012 Ukraine. Department of Mechanical Engineering Universitas Muhammadiyah Tasikmalaya Indonesia Faculty of Informatics and Computing Universiti Sultan Zainal Abidin Kuala Terengganu Malaysia Department of Mechanical Engineering Sekolah Tinggi Teknologi Cileungsi Indonesia Department of Physics Universitas Islam Negeri Sunan Gunung Djati Bandung Indonesia Informatics Study Program Universitas Langlangbuana Bandung Indonesia Department of Industrial Engineering Universitas Suryakancana Cianjur Indonesia

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