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Loan to value (LTV) ratio policy and its impact to property development

AIP Conference Proceedings 2020年第1期2230卷

作者： Dyar Paramitha Ahmad Gamal Azrar Hadi 1Master Student Program Architecture Department Faculty of Engineering University of Indonesia Indonesia 2Assistant Professor Architecture Department Faculty of Engineering University of Indonesia Indonesia 3Lecturer Architecture Department Faculty of Engineering University of Indonesia Indonesia

One of the changes in Bank Indonesia (BI) policy Number 20/8/PBI/2018 (PBI, 2018) regulates the Loan to Value (LTV) ratio for a residential property loan. This research examines changes in housing developer behavior in providing the housing products before and after the loan to value ratio (LTV) easing policy. The changes in the Bank Indonesia policy to release the loan to value ratio for the purchase of the first house with an area of more than seventy square meters is one of the government's solution to encourage the growth of housing property. This issue is due to the difficulty of the first-time home buyer in paying the down payment. The design of this research uses a case study of multiple case holistic designs and uses a qualitative analysis method. Qualitative data were obtained from in-depth interviews with nine housing developers. We found that most developers are willing to change their market segmentation to a lower segment (36 household type) than the previous ones that they have set. We concluded that the LTV ratio easing policy cannot help many developers if the macroeconomic conditions are still weak.

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Analysis of working posture on musculoskeletal disorders of vocational garment student’s in garment assembly operations practice

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AIP Conference Proceedings 2020年第1期2217卷

作者： Irham Aribowo Bambang Suhardi Eko Pujiyanto 1Master Program of Industrial Engineering Universitas Sebelas Maret Surakarta Jl. Ir. Sutami No. 36 A Kentingan Surakarta 57126 Indonesia 2Garment Engineering AK Tekstil Solo JL. Ki Hajar Dewantara Surakarta 57126 Indonesia

Garment assembly operation practice is one of the courses in the garment study program. It is a process of learning to sew components into apparel use a single needle sewing machine. The existing sewing machine has fix height at the table and the chair which is not base from the ergonomic aspects on working posture. Incompatibility of working posture will lead the student to obtain a variety of muscle and bone disorders. In this study, 11 students are measured of work postures by RULA scores, while the fatigue level was measured use Nordic Body Map Questionnaire. The results showed that students have complained of pain in back, buttocks, waist and nape of the neck. The RULA scores showed that there awkward work posture. It is indicated that the working posture in the garment assembly operation practice needs to change.

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A framework of stand up motorized wheelchair as universal design product to help mobility of the motoric disabled people

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AIP Conference Proceedings 2020年第1期2217卷

作者： B. Bambang Sulistiyawan Susy Susmartini Lobes Herdiman 1Master program of Industrial Engineering Faculty of Engineering Universitas Sebelas Maret Surakarta Jl. Sutami No. 36A Kentingan Surakarta 57126 Indonesia 2Departement of Industrial Engineering Faculty of Engineering Universitas Sebelas Maret Surakarta Jl. Sutami No. 36A Kentingan Surakarta 57126 Indonesia

The number of motoric disabled people in mobility is high. Motoric disability inhibits necessity to maximize one’s potential and working on it has numerous great benefits such as transporting to other places, doing the job, exercises or health recovery. They need appropriate assistive devices as power wheelchair models to assist their daily activity. However, they have many barriers to access them such as the price and availability of the device, and possible solutions in technology is needed especially in developing country like Indonesia. One possible solution is to reduce the owning cost of the assistive device, it is by proposing research by making the prototype of the stand up motorized wheelchair (SUMW) which uses the approach by Universal Design concept to accommodate the motoric disability needs and proposed as an assistive mobility device which has reasonable price, comfort in mobility, enable the users to be healthier and productive even in their disability status. As the first prototype product, the SUMW was designed by composing the existing electric motor driver of electric wheelchair and three standard actuators of patient bed with the special purpose of mechanical frame structure by using reverse engineering approach. This paper aims to descript the connection of theories to research problems, purposes, design and significance, so that it can give some visions about further researches to develop a stand up motorized wheelchair.

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Multi responses optimization of plastic injection molding for biodegradable polymers using Taguchi method and TOPSIS

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AIP Conference Proceedings 2019年第1期2097卷

作者： Nano Koes Ardhiyanto Eko Pujiyanto Cucuk Nur Rosyidi 1Master Program of Industrial Engineering Department Sebelas Maret University Indonesia 2Industrial Engineering Department Sebelas Maret University Indonesia

This study reports a simulation study to reduce the shrinkage and warpage of Poly Lactic Acid (PLA) by optimizing the injection molding parameters using the Taguchi-TOPSIS method. Solidwork software were used to creating a specimen modelling of car accessories (shark fin antenna) and then employing the infinite element software, Autodesk MoldFlow Adviser. The effect of injection parameters on the warpage and shrinkage of specimen were examined carefully. The simulation result shows that Taguchi-TOPSIS method provided an outstanding result for the optimization of injection parameters to produce minimum volumetric shrinkage. Orthogonal array design was using L9 of design experiment. The injection parameter of melt temperature was the most significant parameter that influences the warpage and volumetric shrinkage for car accessories (shark fin antenna). The results of this study indicated that the optimal level combination to get minimum shrinkage and warpage in the injection molding process are 25°C of mold temperature, 148°C of melt temperature, 0.7 s of injection time, and 8 s of cooling time. The optimum value of warpage and volumetric shrinkage rate are 0.9949 mm and 4.14 %.

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Building integrated thin film photovoltaic performance modelling on conventional building

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AIP Conference Proceedings 2020年第1期2255卷

作者： Elok H. Rusnindyo Eriko Arvin Karuniawan Ahmad A. Setiawan F. Danang Wijaya 1Master of System Engineering Universitas Gadjah Mada Jl. Teknika Utara No. 3 Yogyakarta 55281 Indonesia 2Departement of Engineering Physics Universitas Gadjah Mada Jl. Grafika 2 Yogyakarta 55281 Indonesia 3Department of Electrical Engineering Universitas Gadjah Mada Jl. Grafika 2 Yogyakarta 55281 Indonesia

PV(Photovoltaic) technologies have been developed into many forms. The emergence of BIPV (Building Integrated Photovoltaics) technology, it is possible for a building component to have another function as an energy generator. The technology of thin film PV, can be used as glass in buildings. PV (Photovoltaics) thin films can be applied as windows glasses. For older or conventional buildings, it is necessary to modify the window to applying the BIPV system. To estimate the energy generated from the BIPV system, a study needs to be conducted. In this study case analysis, a BIPV will be applicate on conventional 4-storey office building. Simulation is done with SAM (system Advisor Model) software. For solar energy potential is obtained from PV GIS data. From the simulation, the 40% of transparency thin film PV that applied in conventional building has 6.8% of capacity factor and 9,761 kWh of energy generated in the first year. A single 0.72 m2 CdTe thin film PV module can generate approximately 23.76-38.01 kWh/year. The thin film BIPV generation is very depending on PV shading, so it important to consider PV orientation and position.

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Grid connected rooftop PV simulation for office building under Indonesian rooftop PV scheme using HOMER

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AIP Conference Proceedings 2020年第1期2255卷

作者： Eriko A. Karuniawan Danang Wijaya Ahmad A. Setiawan 1Master of System Engineering Gadjah Mada University Jl. Teknika Utara No. 3 Yogyakarta 55281 Indonesia 2Departement of Electrical Engineering and Information Technology Gadjah Mada University Jl. Grafika 2 Yogyakarta 55281 Indonesia 3Departement of Engineering Physics Gadjah Mada University Jl. Grafika 2 Yogyakarta 55281 Indonesia

The Indonesian government has issued the Minister of Energy and Mineral Resources (MEMR) Regulation 49/2018 regarding the utilization of rooftop solar power systems by customers of utility grid provider (PT Perusahaan Listrik Negara). The policy aims to encourage the penetration of renewable energy usage to reduce carbon gas emissions. This policy governs the general requirements and procedures for the installation of rooftop PV(photovoltaic) systems by utility grid customers. Therefore, economic analysis is needed to be known the impacts to the customers. This study will simulate the 4-storey office building which electricity supplied by grid connected 41 kWp of rooftop PV without battery storage under PV rooftop scheme using HOMER (Hybrid Optimization of Multiple Energy Resources) software. This case study simulate the new for Environmental Studies Center of Gadjah Mada University (PSLH UGM) building located in Yogyakarta, Indonesia. From this study will be obtained the value of the cost of energy (COE). In this simulation, the 41kWp rooftop PV supplies 485.32 kWh/day and 148.21 kW peak demand load. The cost of energy generated from on grid rooftop PV system is 1.431,00 IDR/kWh, while the grid rates is 1.468,00 IDR.

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Consumption, power number, and power curve characteristic of water diesel fuel emulsion mixer

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AIP Conference Proceedings 2020年第1期2296卷

作者： Agus Sartomo Budi Santoso Ubaidillah 1Master Program of Mechanical Engineering department Sebelas Maret University Jl. Ir. Sutami Kentingan Surakarta Indonesia 3Agency for The Assessment and Application of Technology Puspiptek Serpong South Tangerang Banten Indonesia 2Mechanical Engineering Department Sebelas Maret University Jl. Ir. Sutami Kentingan Surakarta Indonesia

Investigations have been done on the consumption of electric power in the process of water-diesel fuel emulsion mixing. The mixing process has been carried out using a mixer equipped with a 4-blade impeller. The mixer and impeller are made of aluminum material, while the impeller shaft is made of stainless steel. The mixer has a cylindrical tube shape and has a volume of 450 ml. Emulsion fuels consist of 85%v diesel fuel and 15%v water. This emulsion fuel has a density property of 858.8 kg/m3 and a dynamic viscosity of 0.0547 Pa.s. The mixing process was carried out at 2,000 rpm mixing speed up to 8,000 rpm at 1,000 rpm intervals. The mixer is connected to an electric motor and inverter, so the mixing speed of the mixer can be adjusted. In this research, data of electric current and electrical voltage are taken at each variation of mixing speed. The experimental data show that the higher the mixing speed, the higher the electric current needed. Thus, electricity consumption also is higher. The highest electrical power consumption is at 8,000 rpm mixer speed, while the lowest power consumption is at 2,000 rpm rotation. Non- dimensional power number (Np) analysis was also carried out in this study. By calculating the Reynold number (Re) and the electric power consumption at each rotation of the mixer, the power number curve (Np) is obtained. This curve is used to predict the power consumption of a mixer with the same impeller shape.

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Pyrolytic thermal decomposition behavior and kinetic parameters of Tetraselmis chuii microalgae

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AIP Conference Proceedings 2020年第1期2255卷

作者： Aloon Eko Widiono Sukarni Sukarni Retno Wulandari Ardianto Prasetiyo Heru Suryanto Uun Yanuhar 1Master Program of Mechanical Engineering Graduate School State University of Malang Semarang Street 5 Malang 65145 East Java Indonesia 2Department of Mechanical Engineering State University of Malang Semarang Street 5 Malang 65145 Indonesia 3Centre of Advanced Materials for Renewable Energy State University of Malang Semarang Street 5 Malang 65145 Indonesia 4Biotechnology Laboratory Department of Water Resources Management Faculty of Fisheries and Marine Sciences University of Brawijaya Malang 65145 Indonesia

The pyrolysis characteristic of the Tetraselmis chuii microalgae has been investigated through a thermogravimetric device. This experiment was carried out on 10 °C/min heating rate with 50 ml/min continuous nitrogen flow rate and 25-900°C temperature range. The results verified that four stages degradation processes were encountered during Tetraselmis chuii pyrolysis. During the pyrolysis process, the active region of volatile release occurs in two different stages. Degradation of carbohydrates and proteins take place in stage 2, whereas lipids are decomposed in stage 3. Analysis of kinetics parameters includes Ea (activation energy), A (pre-exponential factor), and n (reaction order) yielded the respective values of 70.68 kJ/mol, 1.72/minute, 1.22 and 223.25 kJ/mol, 11.43/minute, 2.44.

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Investigation on kinetic parameters during combustion of Tetraselmis chuii microalgae under thermogravimetric analyzer

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AIP Conference Proceedings 2020年第1期2255卷

作者： Ardianto Prasetiyo Sukarni Sukarni Retno Wulandari Aloon Eko Widiono Heru Suryanto Uun Yanuhar 1Master Program of Mechanical Engineering Graduate School State University of Malang Semarang Street 5 Malang 65145 East Java Indonesia 2Department of Mechanical Engineering State University of Malang Semarang Street 5 Malang 65145 Indonesia 3Centre of Advanced Materials for Renewable Energy State University of Malang Semarang Street 5 Malang 65145 Indonesia 4Biotechnology Laboratory Department of Water Resources Management Faculty of Fisheries and Marine Sciences University of Brawijaya Malang 65145 Indonesia

The investigation on combustion characteristic and kinetic parameters of Tetraselmis chuii microalgae was carried out under thermogravimetric analyzer. The sample of microalgae has prepared by the Center for Brackish Water Aquaculture (BBPBAP) Jepara, Indonesia. The drying out the water content in the sediment was performed by an oven at temperature 80 °C as long as 24 h. The dry sample then the crushed and followed by sieving to be mesh size of 60. The thermal decomposition of Tetraselmis chuii microalgae was investigated by a thermogravimetric apparatus, in which the 10 mg of sample was heated up in the temperatures range of 25-900 °C with an atmospheric airflow rate of 50 mL/min and a heating rate of 15 °C/min. The mass loss during temperature expansion was recorded by a computer to be a thermogravimetric (TG) graph and used to evaluate the thermal characteristic of the sample. The kinetic parameters were evaluated in the active combustion zone by the Arrhenius method, resulted in the respective values of reaction order (n), logarithmic frequency factor (log A), and activation energy (E) were 1.24, 9.0 min−1 and 101.05 kJ mol−1 for stage II, and 2.38, 33.31 min−1 and 502.88 kJ mol−1 for stage IV.

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Potential of natural sunlight for microalgae cultivation in Yogyakarta

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IOP Conference Series: Earth and Environmental Science 2022年第1期963卷

作者： E Habibah E A Suyono M D Koerniawan L T Suwanti U J Siregar A Budiman Master Program in System Engineering Gadjah Mada University Jalan Teknika Utara 3 Kampus UGM Yogyakarta 55281 Indonesia Faculty of Biology Gadjah Mada University Jalan Teknika Selatan Kampus UGM Yogyakarta 55281 Indonesia Center of Excellence for Microalgae Biorefinery Gadjah Mada University Sekip K1A Yogyakarta 55281 Indonesia Department of Architecture School of Architecture Planning and Policy Development Institut Teknologi Bandung Jl. Ganesha No. 10 Bandung 40132 West Java Indonesia Department of Veterinary Parasitology Faculty of Veterinary Medicine Universitas Airlangga. Jl. Mulyorejo Kampus C Unair Surabaya 60115 East Java Indonesia Department of Silviculture Faculty of Forestry Institut Pertanian Bogor. Jl. Lingkar Akademik Dramaga Bogor 16680 West Java Indonesia

The study of microalgae is widely developed on a laboratory scale. The large-scale applications of microalgae such as large photo-bioreactors or commercial ponds are not well established due to some obstacles. The high cost of artificial lighting in microalgae cultivation is one of the obstacles. Markedly, the natural sunlight intensity is high every month for a whole year in Indonesia. This natural sunlight may serve as a low-cost lighting source for microalgae cultivation in a tropical country such as Indonesia. However, the basic knowledge of whether the natural sunlight in Indonesia is sufficient or not for microalgae cultivation is poorly understood. This study was performed to investigate whether sunlight in Indonesia, particularly in Yogyakarta, is sufficient or not for microalgae cultivation in the absence of artificial lighting. The sun lighting period data from January 2019 to June 2020 were collected from BMKG (Badan Meteorologi Klimatologi dan Geofisika) website. The sun lighting period data were converted into solar radiation data. The Liliefors test was performed to evaluate the distribution of the solar radiation data. To confirm whether the sun lighting in Yogyakarta is sufficient for microalgae cultivation or not, the parametric statistical test namely single sample T-test was used in this study. The Liliefors test showed that solar radiation in Yogyakarta (January 2019 to June 2020) was normally distributed. The calculated Liliefors value (0.14) was less than Liliefors table value (2.00). The T-test results revealed that the solar radiation in Yogyakarta is equal to or higher than the sufficient solar radiation (reference) for microalgae cultivation (795 kWh/m2). The calculated t value (0.65) was higher than the t table value (-1.74). When taken together, our findings suggest that natural sunlight in Yogyakarta is sufficient as a lighting source for microalgae cultivation.

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