Center for Scientific Publication
Not a member yet
4029 research outputs found
Sort by
Analisis Sentimen Ulasan Pengguna Aplikasi E-Samsat Provinsi Jawa Barat Menggunakan Metode BiGRU
Get PDFOrganizing the facilitation of local revenue tasks and public services is one of the main tasks, functions, detailed unit tasks, and work procedures of the West Java Provincial Revenue Agency. One of the public services for the community in improving service to the West Java community is to launch an e-samsat innovation in providing annual Motor Vehicle Tax (PKB) payment services and updating ownership status through an Android-based smartphone application called Samsat Mobile Jawa Barat (SAMBARA) and can be downloaded for free on the Google Play Store. Service satisfaction is an important aspect in service development, therefore research was conducted. This study analyzes the sentiment of the Samsat Mobile Jawa Barat (SAMBARA) application on the Google Play Store by categorizing user reviews into three groups: Positive, Negative, and Neutral. The method chosen is the Bidirectional Gated Recurrent Unit (BiGRU). BiGRU is able to predict user reviews with an accuracy of up to 87.37%, which is considered good and can be used to help the development of service applications in West Java
Pengendalian Kualitas Statistik Air Higiene Sanitasi Menggunakan Peta Kendali SSRM
Get PDFSanitary hygiene water is water that is used by everyone for bathing, washing, and toilet purposes where the quality standards for sanitary hygienic water are regulated in PERMENKES RI No. 32 of 2017. In the process of treating raw water into sanitary hygiene water, the water treatment plant unit pays attention to five quality characteristics, namely the pH level of the water, active chlorine concentration, turbidity, total hardness, and total solids. The quality control process carried out in the water treatment plant unit is classified as conventional by only checking the composition of each quality characteristic with the quality standard specifications without checking simultaneously. This study aims to determine statistical quality control through average monitoring of the sanitary hygiene water production process using a modern multivariate control chart resulting from the integration of the Multivariate Exponentially Weighted Moving Average (MEWMA) control chart with a spatial signed rank called the Spatial Signed Rank MEWMA (SSRM) control chart. The results showed that the characteristics of sanitary hygiene water had an influence on each other and did not have a multivariate normal distribution. So statistical quality control of sanitary hygiene water can be carried out using the SSRM control chart. This is because the SSRM control chart is good for data that is not normally distributed. This study also conducted monitoring of the average sanitary hygiene water process using the MEWMA control chart. The SSRM control chart is more suitable for controlling sanitary hygiene water than the MEWMA control chart because the number of out-of-control data observations on the SSRM control chart is greater than the MEWMA control chart
Alternative of Soil Improvement Methods on Organic Soil Using Preloading and Vertical Piles for Embankment with Varied Heights. Case Study: Construction of Batanjung Port Access Road in Pulang Pisau Regency, Central Kalimantan
Get PDFThe Central Kalimantan is a province with great potential for economic development. Several development plans have been launched by the government, one of which is the construction of the Batanjung Industrial Estate, Batanjung Port , and its access. The Batanjung Port development plan is in line with the Central Kalimantan Provincial Spatial Plan (RTRW) for 2015-2035, and has been stipulated in the National Medium-Term Development Plan (RPJMN) 2020-2024 and the Strategic Plan of the Ministry of General Works and Public Housing for 2020-2024. Therefore, it is necessary to build an access road to the Port of Batanjung, Central Kalimantan.However, constructing new roads requires cautious construction plan considering the type of soil in Central Kalimantan Province which is dominated by soft soils and organic soils formed by weathered plants and has a high groundwater table. Problems that generally arise include the occurrence of long and large compression (settlement) and road embankment slides. Common efforts to increase the bearing capacity of organic soil in Central Kalimantan are the installation of galam wood driven piles into the soil and the use of geosynthetic such as geotextiles. Therefore, in this study a new road embankment using national road standards is planned by observing the 5-year and 50-year Flood Water Levels (FWL) in Central Kalimantan Province. The construction use mechanical soil improvement in the form of PVD, wood piles, micropile, and geotextiles for varying road embankment heights. Then the planning results are analyzed to find out the most efficient method in terms of material use.Based on the analysis, the most efficient soil improvement method is the PVD method to accelerate consolidation rather than the micropile method to reduce the amount of compression. In addition, the most efficient reinforcement is by using geotextiles instead of galam wood piles. These results can be appled to both 5-year and 50-year FWL
Numerical Study of Damper Plate and Nozzle Effect on Vortex Turbine Basin for Increasing Flow Kinetic Energy Entering Turbine Rotor
Get PDFThe Gravitational Water Vortex Power Plant (GWVPP) is a small-scale hydroelectric power generator that makes use of the energy generated from a vortex flow to turn turbine blades and generate electricity. In this research study, the focus was on the numerical analysis of the basin design of the GWVPP, which is divided into three sections: vortex generator section, transformer section, and turbine section. To support the transformation process from tangential vortex speed to axial vortex speed in the transformer section, a damper plate was installed to direct the rotating flow. The effect of the nozzle in accelerating the flow for optimizing the basin design was also studied to reduce blockage caused by the transformation process. The numerical results indicate that designs with nozzle have lower velocity outputs due to blockage from the rotating flow. At flow rate of 0.1 m3/s, the presence of damper plate reduces the maximum flow rotation, but at flow rate of 0.2 m3/s, it prevents flow leakage on the surface. The basin design without damper plate and nozzle is the optimal variation for flow rates of 0.1 m3/s, while the design with damper plate but without nozzle is optimal for flow rates of 0.2 m3/s
EFISIENSI DAYA DUKUNG TIANG DALAM GRUP MENGGUNAKAN PENDEKATAN ANALISA FEM 3D
Get PDFBesar kecil nilai efisiensi pada pondasi tiang dalam grup terjadi karena pengaruh overlapping persebaran tegangan. Beberapa rumus untuk menghitung efisiensi hanya menggunakan tipe pondasi end bearing capacity. Padahal ada tipe pondasi pondasi friction bearing capacity. Yudiawati (2019) mengamati efisiensi full friction didapatkan bahwa kelompok tiang yang lebih dalam memiliki nilai efisiensi lebih rendah. Metode penelitian tersebut dilakukan aktual sehingga biaya dan waktu dihabiskan besar dan variasi diuji sedikit. Sehingga perlu metode lebih efektif yakni Finite Element Method 3D (FEM 3D). Dengan FEM 3D jumlah variasi yang diujikan bisa lebih banyak dan waktu yang digunakan juga relatif singkat. FEM 3D dipilih karena memiliki karakteristik yang paling mendekati dengan yang aktual. Hasilnya efisiensi pada FEM 3D menunjukkan bahwa tipe pondasi pondasi mempengaruhi besar kecil nilai efisiensi. Tipe pondasi full friction memiliki 40% nilai efisiensi lebih kecil dibandingkan tipe end bearing capacity. Selain itu Semakin panjang kedalaman tiang maka semakin kecil nilai efisiensi. Pada tipe pondasi end bearing capacity pengaruh kedalaman tidak terlalu signifikan hanya sebesar 1-5%. Sedangkan pada tipe full friction pengaruh kedalaman terhadap nilai efisiensi bisa mencapai 5-10%. Pada penelitian ini Nilai efisiensi pada tipe End bearing adalah berkisar antara 0,45-0,9. Sedangakan untuk tipe full friction berkisar antara 0,23-0,65
NEW URBANISM AND URBAN DESIGN DIMENSION IMPLEMENTATION IN PUBLIC SPACE IN THE SIMPANG LIMA AREA, SEMARANG CITY
Get PDFNew urbanism, originally meant a reform movement and then developed into a new paradigm in urban design. However, recently researchers argue that the attractiveness of new urbanism has begun to diminish so that it has lost its significance. The research was conducted to determine the strengths and weaknesses of the Simpang Lima Area and Jalan Pahlawan Semarang when viewed using the theory of Urban dimension and New Urbanism, so that it can be an evaluation for related parties. The steps taken in the study used three stages, namely the initial stage of description. At this time, the researcher describes what he saw, heard, and understood. For the first time, researchers get a glimpse of the results of the informants. reduction stage. In this stage, researchers retrieve all the information from previous meetings to concentrate on one particular problem. Selection stage. At this stage, the researcher will detail the problem that is the focus, which will then be analyzed in more depth. The research location is at Simpang Lima or called the Pancasila Field which is one of the Landmarks of Semarang City, in the form of an open space used by Semarang City residents for activities. The city of Semarang is synonymous with Simpang Lima because many big events are held here, besides that Simpang Lima is also the center of the crowd of the city of Semarang. The final results of the research produce topics using information that is used to produce some new knowledge, hypotheses, or even theories
LEARNING ABOUT CONCRETE-FILLED TUBE USING CHATGPT
Get PDFChatGPT is an artificial intelligence that can understand context and respond appropriately. It could be used for research on a topic. However, ChatGPT does not always provide accurate information. Its performance has not been tested in engineering fields. In this study, ChatGPT was consulted about concrete-filled tubes (CFT), which is a structural element primarily subjected to axial load. Fifty-eight questions were posted to ChatGPT. ChatGPT’s responses (370 sentences) were evaluated. ChatGPT generated plagiarism-free statements, with only a 12% Turnitin similarity index. 78.6% of ChatGPT’s sentences were long and complex. Thus, Hemingway Editor gave them a Grade 14 for poor readability. The information given by ChatGPT can be classified as correct, erroneous, contradictory, and unverified. ChatGPT could be used as a research tool, but with limitations. It can explain the basic concepts of CFT but also provide inaccurate and contradictory information. A researcher needs to be cautious while using ChatGPT in research. ChatGPT could be used to test some hypotheses or theories. However, the quality of the output is dependent on the user’s critical inputs and an in-depth conversation with ChatGPT
Influence of Slat Size Variation as Passive Flow Control Instruments on NACA 4415 Airfoil Toward Aerodynamic Performance
Get PDFAirfoil is a fundamental geometry in designing various aerodynamic objects. Passive flow control installation is essential in determining the airfoil's aerodynamic performance. The influence of variations in slat size as a passive flow control instrument is analyzed using the CFD method with a Reynold number of Re= 10^6. NACA 6641 airfoil was used as the slat geometry with size variations of 10%c and 16%c. Based on the computational results, variations in slat size have a substantial influence on the aerodynamic efficiency of the airfoil. Variations in slat size additional Cl ability to reach 20.6043% and 13.1917%, respectively. In addition, a 16%c slat can delay a stall until it reaches AoA ≥ 19°. Meanwhile, a 10%c slat can delay a stall until it reaches AoA ≥ 17°. However, variations in slat size also affect the resulting drag force. Slat measuring 16%c can addition Cd up to 50.9252%. Meanwhile, 10% c slat additional Cd up to 21.8389%. Based on the resulting lift-to-drag ratio curve, a 10%c slat has the lowest lift-to-drag ratio compared to a 16%c slat. However, a 10%c slat has the highest level of stability when compared to a 16%c slat installation and without a slat installation.
Productivity Analysis Using the Critical Chain Project Method Management (CCPM) on Repair Projects Geomarin-III ship 649 DWT.
Get PDFShip repair project planning still often encountered problems that delay ship repair projects to achieve complete ship repair projects. Delays are due to frequent mismatches between ship repair scheduling and conditions that occur at the shipyard. The most commonly used method is the Critical Path Method (CPM). But in reality, the CPM method is considered less effective because there is still safety time for each job. Technological developments found the latest method, namely Critical Chain Project Management (CCPM). This method removes the safety time contained in the CPM method and replaces it with buffer time which is placed at the end of work activities. This study aims to analyze the duration of the critical path, determine labor costs, and the amount of buffer duration on the repair of the Geomarin-III 649 DWT ship. Based on the calculation results obtained on the repair of the Geomarin-III 649 DWT ship with the Critical Chain Project Management (CCPM) method is 10 days, 10 days faster than the normal duration. The labor cost obtained using the CCPM method is IDR. 54,017,500, saving 35% of the normal cost is IDR. 82,680,000, but if the buffer time is used thoroughly, the total estimated labor cost for the CCPM method will increase due to the addition of labor and the duration of the buffer time obtained by the CCPM method as a substitute for safety time, which is 9 days project buffer and 3 days feeding buffers. Based on this research, it was found that the CCPM method is considered effective and can accelerate the duration of the project and minimize labor costs
