Infotekmesin

Kekerasan Baja DC 11 Pada Perlakuan Media Quenching dan Suhu Tempering

Naufal Hanif Fadhlurrohman Aziz, Sulistyono Sulistyono — Mon, 09 Jan 2023 15:00:53 +0700

Heat treatment is a process of renewing the metal structure by heating the specimen to a temperature below the melting point and a certain time, which is then cooled in a cooling medium to change the physical and mechanical properties. This study aims to determine the effect of quenching media and tempering temperature on the hardness value of DC 11 steel. This study used an experimental method with hardening at 990 °C and a holding time of 30 minutes with quenching media with SAE 10W-30 oil and 3.45 NaCl solution. %. After that, tempering was carried out at 250 °C, 350 °C, and 450 °C with a holding time of 2 hours. Then, the specimens were tested for hardness using the Rockwell method. Based on the results of the study, it was found that the effect with the highest hardness value was found in the quenching media with 3.45% NaCl solution and a tempering temperature of 250 °C of 49.6 HRC. The conclusion obtained is that the higher the tempering temperature, the lower the hardness value.

Animasi “Keluarga Aman” Sebagai Media Sosialisasi Pencegahan Penularan COVID-19

Mon, 09 Jan 2023 15:09:29 +0700

Adaptation to new habits (new normal) must be implemented considering that people must continue their activities amidst the outbreak of Covid-19 transmission cases. Apart from the government and community organizations, awareness of prevention must be carried out by each individual even though they have been vaccinated. The purpose of this research is to create a 2D animation to socialize the application of the 5M health protocol used to prevent widespread transmission of Covid-19. The process of creating a 2D animation titled "Safe Family" is carried out in three stages. First, the pre-production stage includes defining ideas and concepts, writing scripts, storyboards, and audio recording. The production stage includes character creation, moving animation, inputting sound, and initial rendering (alpha test). The third step is the post-production stage, namely the final rendering. and evaluation (beta test). The results of the alpha test show the suitability of the idea, storyboard, and final rendering results. In addition, the results of beta testing show that on average 93.4% of respondents considered the 2D animation titled "Safe Families" to be appropriate for use as social media to prevent Covid-19 communication.

Optimalisasi Daya Output Pada Photovoltaic Penggunakan Sistem Tracking dan Fuzzy Logic Controller

Misti Qurniatun, Sugeng Dwi Riyanto, Muhamad Yusuf — Mon, 09 Jan 2023 15:15:20 +0700

Photovoltaic is one of the environmentally friendly power plants. One of the problems using photovoltaic is the low efficiency level. Therefore, a method is needed to optimize photovoltaic performance. The use of fuzzy logic control for dual axis tracking system is used in this study to optimize photovoltaic performance. The dual axis tracking system functions to keep the photovoltaic always perpendicular to the direction of the sun's arrival so that it has more optimal output power. The input of the tracking system comes from the LDR sensor which is installed on each side of the Photovoltaic. This sensor is combined with RTC to anticipate weather changes (cloudy). LDR and RTC sensor data as input for fuzzy logic controller. Based on the results of the research, the output power of the Photovoltaic tracking system is 9.363 Watts or 46.82% of the Photovoltaic specifications. Meanwhile, static photovoltaic with conventional installation has a power of 7.247 Watt or 36.23% of the specification. So that Photovoltaic with fuzzy logic control for dual axis tracking system is 29.20% more optimal.

Analisis Konsumsi BBM dengan Variasi Lingkungan Operasi Kendaraan Bermotor Menuju Perilaku Eco-Drive

Mohammad Syarifudin, Kemas Muhammat Abdul Fatah, Ruslan Dalimunthe — Mon, 09 Jan 2023 00:00:00 +0700

The increase in greenhouse gases in the form of CO₂ gas as vehicle exhaust emissions contributes to climate change. Technological approaches and alternative fuels continue to reduce fuel consumption, but this is not enough. Another method is to use eco-drive behavior, one of which is related to replacing the air filter. This study is purposed to provide guidelines for motorized vehicles operating in selected areas in Lampung Province in the behavior of eco-driving. The results of the fuel consumption test using the full-to-full method found that at each filter distance (8,000 km, 12000, and 16,000 km), vehicles operating in Mesuji with the highest deficiency, followed by Tanjung Bintang and Krui areas. In line with eco-drive behavior, for vehicles operating in Mesuji, the air filter replacement period must be faster than the other two areas, followed by Tanjung Bintang and Krui.

Effect of Butanol-Gasoline Blend Toward Performance Matic-Transmission Applied in Single Cylinder Capacity Engine

Mon, 09 Jan 2023 15:30:42 +0700

The availability of fuel oil is decreasing while the level of consumption is increasing. This encourages the need for the development of alternative energy to minimize the crisis. This study investigates the characteristics of fuel and automatic transmission combustion engines. The fuel used is butanol variations B7, B12 and B18 (7%, 12%, and 18%) and pertalite (RON-90). The gasoline engine used has a capacity of 110 cc with a compression ratio of 9.5:1, an automatic transmission system, and air conditioning. The performance test equipment used is the Dynotest-chassis type 50L-BRT. Fuel variations are applied to an engine performance test by using engine speeds of 3000-9000 rpm. The results showed that the use of 18% butanol increased the output power and thermal efficiency by 8.3 kW and 923.95 kPa at 8000 rpm. torque and MEP (average effective pressure) increased by 8 N.m and 923.95 kPa at 5000 rpm. Meanwhile, SFC (specific fuel consumption) decreased by 0.35 kg/kWh at 8000 rpm.

Teknologi Augmented Reality Untuk Terapi Pijat Wajah Ibu Hamil Dengan Preeklamsia

Nur Wachid Adi Prasetya, Linda Perdana Wanti, Lina Puspitasari — Mon, 09 Jan 2023 00:00:00 +0700

Preeclampsia is a disease of pregnant women, causing many complaints, including dizziness. Massage is the right solution to reduce dizziness since the use of analgesic drugs is not recommended. Submission of massage information can be more effective through digital technology. The purpose of this research is to build an application based on Augmented Reality (AR) as a guide for facial massage movements for midwives and pregnant women to deal with complaints of dizziness for pregnant women. The method used is the Multimedia Development Life Cycle (MDLC), which consists of the stages of making a concept, making a design, collecting materials, combining materials, testing, and distribution. Black box testing on 10 scenarios produces a value of 100%, which means the application can run properly. In addition, usability testing using the System Usabilities Scale (SUS) method shows a value of 69.5, which means that the application has the "good" criteria and is acceptable to users.

Cyclomatic Complexity dan Graph Matrix dalam Pengujian Sistem Informasi Manajemen Rumah Sakit

Cahya Vikasari — Mon, 09 Jan 2023 00:00:00 +0700

Information systems can assist hospital management in improving services at a hospital. The software development method used in making hospital management applications is using the waterfall method which one of the stages is testing. The problem in system development is that the testing process is not optimal and focuses more on system development so that errors can be found at the implementation stage. System testing is a permit for an error in the system being developed. The aim of the research is to check the design details, use the program design control structure procedurally and run the program to find errors. The method applied to carry out the testing phase in the hospital management system is the Whitebox method using the cyclomatic complexity and graph matrix approaches. Testing will be carried out on the process of managing inpatient data in the application. The results of the research from testing the hospital management system using the cyclomatic complexity approach are that it can provide information on the minimum number of tests and ensure that all program structure paths are used at least once. In addition, the results of the graph matrix test are the probability side that will be carried out.

Analisis Performa PLTS Off Grid Untuk Sistem Desalinasi Metode Osmosis Terbalik

Mon, 09 Jan 2023 15:54:41 +0700

Bondan Hamlet is a hamlet in Kampung Laut District, Cilacap. One of the community's problems is the lack of clean water and the PLN electricity network. In 2020, a desalination facility named Sidesi Mas will be built in Bondan Hamlet with a capacity of 240 liters/hour and using the reverse osmosis principle. The energy source for desalination uses a solar power plant (PLTS). Desalination management requires economic analysis, especially in determining the selling price of desalinated water. The cost of producing desalinated water can be calculated using the Cost of energy (CoE) value of the PLTS or the costs incurred to produce electrical energy per 1 kWh. To get the PLTS CoE, this article discusses a simulation to analyze the performance of PLTS desalination systems with Homer software. Homer performs analytical calculations based on a location input, solar energy potential, capacity, and costs of PLTS components as well as electrical load data. The simulation results show that PLTS energy production is 535 kWh/year, the CoE value is IDR 21,975/kWh and the production cost for producing clean water is IDR 183.13/liter.

Peranan Parameter Quench dan Temper Pada Ketangguhan Carbon-Manganese Steel

Akhlis Rahman Sari Nurhidayat, Nur Akhlis Sarihidaya Laksana, Yurianto Yurianto — Mon, 09 Jan 2023 00:00:00 +0700

The use of material that is specified as armor steel has a high resistant value. The quenching and tempering process is done to improve the toughness of the material. The process uses a temperature of 900oC on the quenching process with water medium and tempering temperatures of 125oC and 175oC holding time for 30 minutes. The tests include the impact test to determine the increase in the material and fractography to determine the ductility of the material. There is a decrease in the value of the impact that occurs after the quenching process. The impact value is increasing due to the tampering impact of 32 J during the quenching process to 50 J. The fractography shows brittle fractures with ridges as a feature of brittle fractures. Rapid cooling rate processes in the quenching process cause cracks in the quenching specimens.

SIPAMBULAN: Sistem Informasi Pelayanan Ambulan menggunakan Algoritma Djikstra

Agus Susanto, Santi Purwaningrum — Mon, 09 Jan 2023 00:00:00 +0700

The rapid development of information technology encourages innovation in various fields, including the field of disaster geographic information services. Lack of information on ambulance service providers is often the cause of delays in handling victims of natural disasters. Besides, the absence of information regarding the nearest route for ambulances to emergency service providers such as health centers and hospitals adds to the length of time for handling victims of natural disasters, resulting in increasingly severe victim losses, including life. This study aims to create a geographic information system that can be used to provide information on the location of the nearest ambulance service provider and emergency unit service. The system development research method uses the extreme programming method by implementing the Djikstra algorithm to determine the shortest route. This system testing process consists of testing the Djikstra algorithm and testing functionality using a usability scale. Djikstra's algorithm testing is done by comparing the results of calculating the shortest route for two location points with the results obtained when using the Google Maps application. The results of this test indicate that the system can display shorter routes than the routes generated by the Google Maps application. On the other hand, testing system functionality using the usability scale method to see system acceptance by users shows that the application can be used properly with a score obtained that is 77.

Designing The Estimation of The Need for Spare Parts and Inventory Policy on The D32 CP8 Compressor Machine

Herlambang Prasetyo Nugroho, Fransiskus Tatas Dwi Atmaji, Nopendri Nopendri — Thu, 26 Jan 2023 04:31:47 +0700

Based on damage data owned by PT XYZ, the compressor engine that has a history of high damage is the D32 CP8 Compressor Engine. Critical components of the D32 CP 8 Compressor are determined using a risk matrix. The critical components selected from the D32 CP8 Compressor Engine are Screw Motor, Refrigerant Air Cooler, and Cylinder Bearing Oil Cooler. This study uses the Reliability Centered Spares (RCS), Min-Max Stock, and Reorder Point (ROP) methods. The data collection and processing results obtained the need for critical components in the next 1 year based on the MTTF critical component data. These calculations show that the value of the required spare parts for the Motor Screw, Refrigerant Air Conditioner, and Cylinder Bearing Oil Cooler in a year is 8 components. The minimum Stock of the Screw Motor is 3 components, the maximum stock is 8 components, ReOrder Point point is 4 components. The minimum stock of 4 component air coolers, maximum stock of 7 components, ReOrder Point when 3 components. The minimum stock of a Cylindrical Bearing Oil Cooler is 2 components, the maximum stock is 6 components, and the ReOrder Point is when there are 2 components.

Unjuk Kerja Pengembangan Prototype Alat Pengering Padi Metode Thin Layer

Thu, 26 Jan 2023 09:41:50 +0700

Based on data from the Central Statistics Agency (BPS) for 2019, Cilacap Regency has an area of 14,000 hectares of rice farming land with a potential for harvesting up to 920,000 tons of rice, then the Binangun District area has 66.5 hectares of rice farming land with a potential of harvesting up to 32,000 tons of rice. Turning paddy into rice requires many processes, one of which is drying rice. Traditional rice drying takes a relatively long time, has an uneven moisture content, and is under an unstable temperature therefore it is necessary to develop a thin-layer method for drying rice. This study used the Rex C100 Thermocontrol as a drying temperature controller, used an Arduino Uno equipped with a BTS 7960 driver to adjust the stirring speed, and a YL-69 sensor to read the rice moisture content. Tests in this study were carried out using Inpari-32 rice with a mass of 2 Kg and a drying temperature of 50-80oC. The result of this study was that the relationship between temperature and time in drying was inversely proportional. The rice drying process uses the highest drying power of 654.5 watts while the lowest power is 467.5 watts. The lowest overall energy use was 2.05 x106 J and the highest energy was 2.60 x106 J. The highest drying rate was 0.50%bk/minute. Effective drying uses a temperature of 80oC with a time of 30 minutes to reach the store-dry rice and 70 minutes to reach the dry milled rice category.

Analisis Daya Elektrik dan Efisiensi dengan Variasi Debit Air dan Sudut Kemiringan Turbin pada Turbin Ulir Archimedes Dua Sudu

Frans Ivan Christofel Hutabarat, Andre Amba Matarru, Gad Gunawan — Thu, 26 Jan 2023 09:43:25 +0700

This study analyzes the effect of water discharge and the angle of inclination of the turbine on electrical power and efficiency using Archimedes screw turbine with two blades. This study aims to determine the effect of water discharge and the angle of inclination of the turbine on the electrical power and efficiency of the two-blade Archimedes screw turbine. The turbine is fed with water at variations of water discharge of 150 l/m, 300 l/m, 450 l/m. And vary angle of inclination of the turbine of 35°, 40°, and 45°. By using the variation of the water discharge that has been mentioned, the electrical power and efficiency obtained are 1,24 W and 9,78 % at a variation of 150 l/m, 2,89 W and 10,77 % at a variation of 300 l/m, and 3,65 W and 9,06 % at a variation of 450 l/m. When varying the angle of inclination, the electrical power and efficiency obtained are 3,33 W and 10,77 % on a slope of 35°, 3,65 W and 10,53 % on a slope of 40°, and 3,15 W and 8,6 % on a variation of 45°.

Desain Mesin Pembuatan Gula Semut Berbahan Dasar Nira Kelapa Skala UMKM

Aswan Munang, Dina Rachmawaty, Arif Reza Basirun — Thu, 26 Jan 2023 09:44:42 +0700

Product development is a combination of technological trends that play a role in creating innovative works. Conceptual design is the initial phase of developing innovative product configurations. The processing of coconut sap into traditional palm sugar has constraints; the production process takes 4 to 6 hours and has a moisture content above 3%. The research objective was to obtain a machine design to increase production volume and reduce the water content in palm sugar. The machine design process begins with conducting interviews with 20 palm sugar craftsmen with approximately 5 years of experience to obtain information on priority needs. The VOC (Voice Of Customer) method can be used to determine priority designs and specifications. The results of the VOC process are (1) machine components made of food-grade materials, (2) production machines that are easy to operate and easy to maintain, (3) production machines with operational costs and affordable prices among MSMEs. The design development process has two alternative machines made using the Solidworks software. The results of the assessment of 30 SMEs’ palm sugar selected alternative two machine designs with dimensions of 70 x 60 x 155 cm. The advantage of the second engine design alternative is that it has a temperature sensor to adjust the gas valve and a pan with an insulator so that it can maintain temperature stability. The design of the palm sugar machine still requires innovation and development to increase production and quality.

Pengaruh Variasi Konsentrasi H3PO4 Sebagai Zat Aktivator Terhadap Karakteristik Karbon Aktif dari Sekam Padi

Thu, 26 Jan 2023 09:46:05 +0700

Rice husk is an organic material that has a high lignocellulosic content so it has the potential to be turned into activated carbon. One method of making activated carbon is activation with a phosphoric acid activator (H3PO4). The purpose of this research was to study the effect of varying concentrations of H3PO4 as an activator on the characteristics of rice husk-activated carbon. The characterization refers to SNI 06-3730-1995 regarding the technical quality requirements of activated charcoal. Activation of rice husk carbon was carried out by contacting the carbon with H3PO4 for 24 hours and shaking it. The H3PO4 consisted of 3 concentration variations, namely 4M, 6M, and 8M. From the research results, the water content was 3.936%; 4.037%; 4.070%, the absorption of iodine has met the character of activated charcoal according to SNI, namely 1217.204 mg/g; 1204.255 mg/g; 1184.832 mg/g while the ash content value does not meet the SNI standard, which is still above 10%. The highest adsorption capacity and adsorption efficiency could be activated with 8M H3PO4, namely 22.42 mg/g and 89.68%. IR spectra on activated carbon with three variations of H3PO4 concentration showed the presence of aromatic C-H, C=C, and C-O anhydride functional groups.

Usability Analysis Aplikasi Mobile Augmented Reality (MAR) untuk Multimedia Pembelajaran Motherboard (Aplikasi AR-Mobo)

Yoiceta Vanda, Dwiyanto Dwiyanto — Thu, 26 Jan 2023 09:48:05 +0700

Currently, Augmented Reality (AR) technology has developed into an easy-to-use, efficient and effective technology for providing innovative educational media. Mobile Augmented Reality (MAR) is an Augmented Reality technology that utilizes mobile devices, for example, smartphones. The MAR application for multimedia learning on the motherboard is seldom used in classroom learning so the effectiveness of learning is less than optimal. The research objective was to determine the level of usability of the MAR application system using the USE questionnaire. According to Arnold M. Lund, Usability analysis has 4 aspects: usefulness, ease of use, ease of learning, and satisfaction. The method used is usability testing with 90 engineering students participating as research subjects. This study uses a questionnaire as a data collection tool and uses descriptive statistical analysis. The results of this study, that the average usability analysis score is 86.22 is included in the very feasible category, based on the system feasibility category table. The developed MAR application shows that it has provided better user interaction. This research has the benefit of knowing the use of MAR applications on students, for specific purposes, namely effectiveness, efficiency, and satisfaction. Lack of user motivation, and lack of features, will cause stress. This occurs when the system cannot meet the goals of its users.

Penerapan Location Based Service (LBS) dan QR Code Detection pada Aplikasi Pemetaan dan Penjemputan Retribusi Parkir Kendaraan Berbasis Android

Dwi Novia Prasetyanti, Riyadi Purwanto, Rostika Listyaningrum — Thu, 26 Jan 2023 09:49:19 +0700

One source of regional income for Cilacap Regency is the management of vehicle parking lots. Currently, parking area management is carried out by recording the identity of the parking location based on the street name, while the withdrawal of parking fees is carried out by towing officers who come to the parking location and then record it in a book. The current management of parking lots is still inaccurate because there are several street names that have more than one parking area which results in data redundancy. The conventional parking fee collection system causes frequent discrepancies in reports due to the potential for misuse of parking fees. The absence of tools that can be used by related agencies to control reports is the cause of the problem. The research objective is to develop an information system by applying LBS technology which functions to detect parking points precisely and QR Code Detection which functions to detect the identity of parking attendants. System development uses the ADDIE model. The results of the research are an information system for mapping parking lots and picking up parking fees based on Andorid which can help manage vehicle parking lots which includes mapping the location of parking lots and picking up vehicle parking fees.

Analisis Porositas, Tekstur, dan Morfologi Karbon Tempurung Nipah Hasil Pirolisis Suhu Tinggi Untuk Anoda Baterai Sekunder

Theresia Evila Purwanti Sri Rahayu, Mohammad Nurhilal, Rosita Dwityaningsih — Thu, 26 Jan 2023 09:51:00 +0700

Lithium-ion batteries are the recent main store of electrochemical energy that have been widely used for electronic equipment, electric vehicles, and also renewable energy storage such as wind and solar. Lithium-ion batteries have many electrochemical advantages but lithium availability in nature is reduced very quickly and its distribution is uneven throughout the world. Sodium is attractive as an alternative to lithium insertion for secondary batteries because of its abundant availability and oxidation reduction potential to standard hydrogen electrodes only 0.3 volts higher than lithium. This study aims to synthesize hard carbon from nipah shell biomass using thermal methods of low-temperature pyrolysis (lower than 200 oC) followed by high-temperature pyrolysis (higher than 1000 oC). Characterization is carried out by iodine number analysis to determine porosity and SEM-EDX to determine texture and morphology. The result of the analysis of carbon iodine number is 346.86 mg/g while SEM-EDX analysis showed that carbon has a structure similar to a combination of graphene and nano-tube carbon.

Kajian Eksperimen Pengaruh Variasi Perubahan Sudut Kincir terhadap Kinerja Paddle Wheel Aerator

Sun, 29 Jan 2023 12:24:45 +0700

The main problem discussed in this study is the effort to improve the quality of shrimp pond water, especially the low dissolved oxygen levels by modifying the angle of the aerator wheel. The results showed that dissolved oxygen (DO) levels were very important in shrimp pond culture and that the paddle wheel aerator was a useful tool in intensive aquaculture systems because it could produce DO as needed. The study used a model designed using Solidworks software and tested at a scale of 1:10 with 3 variations of angles (15°, 35°, and 55°) at each wheel angle. The test results show that the angle variation affects the rotational speed and DO production, with the highest rotational speed and DO production achieved at an angle variation of 55°. However, the best parameters for the aerator were found at a variation of the wheel angle of 35° and a rotational speed of 300 rpm, because it produced the highest dissolved oxygen with relatively low power.

Studi Eksperimental Pengaruh Variasi CDI Terhadap Performa Kendaraan Empat Langkah

Didik Sugiono, Aini Lostari , Novi Indah Riani, Aries Kusdyanto — Sun, 29 Jan 2023 12:44:11 +0700

The ignition system is a system that greatly affects the performance of a vehicle. Capacity Discharge Ignition (CDI) is a component in the ignition system that works to set the right ignition timing, therefore combustion can be maximized. This study aimed to compare the use of a factory CDI with a CDI from another vehicle, namely the 110 cc Shogun, to determine the performance of a 125 cc GL Max motorbike including torque, power, and fuel consumption to efficiency. The data collection was carried out at speeds of 25 km/hour to 65 km/hour for each gear with an increase of 10 km/hour. The results showed that the larger the gear or teeth, the value of torque, power, and efficiency will also increase. The best results were obtained in the 110 cc Shogun CDI variation with respective values of 7.96 Nm, 6.8 pk, and 81.14%. Meanwhile, the value of the most economical fuel consumption is still the standard CDI GL Max 125 cc with a value of 0.12 kg/pk.hour in the highest gear.

Metode Pengembangan Perangkat Lunak MDLC Pada Rancang Bangun Media Pembelajaran Planet Berbasis Teknologi Augmented Reality

Sun, 29 Jan 2023 15:18:56 +0700

Along with the development of smartphones, Augmented Reality technology has begun to be used as a medium of interaction, although it has not been properly implemented and applied as a supporting medium. The use of still image objects in textbooks can make students tend to be more passive and less interactive because media images are unable to provide a reciprocal response. In science subjects, there is solar system material regarding planet recognition. Props are needed as learning media because the object of observation from the planet is too large. Several props are used as imitations of the planets, such as the use of drawing paper, audio, and video. The purpose of this research is to make a breakthrough in the use of Augmented Reality technology to support media for understanding planet recognition material by creating digital teaching aids that can be installed on smartphone devices. The MDLC method is an alternative method for developing multimedia applications that are easy to understand. The results of the test show that the application can function as expected, where each planetary marker that has been made can be recognized properly according to the intended planetary object.

Korelasi Konsentrasi Etanol 5% Pada Bahan Bakar Gasolin Terhadap Performa, dan Emisi Gas Buang Mesin Bensin 150cc

Sun, 29 Jan 2023 15:37:01 +0700

Ethanol has higher octane and oxygen properties than fossil-fuel gasoline. Along with the increase in gasoline dependency and exhaust emissions, the use of ethanol as a fuel is urgently studied. This study aimed to observe the concentration of 5% ethanol in gasoline on the performance and exhaust emissions of a 150cc gasoline engine that was operated at 1000, 2000, and 3000rpm. The observation results show that the concentration of 5% ethanol in gasoline correlates with an increase in performance with indications of an increase in EGT, Brake power, BTE, and a decrease in SFC. On the emission side, it is also correlated with an increase in the quality of exhaust emissions with indications of increased CO2 emissions and reduced CO and HC emissions. The best correlation of 5% ethanol concentration was obtained at an operating speed of 2000rpm with an increase in EGT of 10.70%, an increase in Brake power of 9.49%, an increase in BTE of 38.62%, an increase in CO2 emissions of 23.06%, a decrease in SFC of 26 .49%, CO emission reduction of 16.67%, and HC emission reduction of 4.24%.

Penerapan Data Mining dalam Analisis Prediksi Kanker Paru Menggunakan Algoritma Random Forest

Laura Sari, Annisa Romadloni, Rostika Listyaningrum — Sun, 29 Jan 2023 15:43:36 +0700

Cancer is the second highest cause of death in the world. In Indonesia, it is a disease with a high mortality rate. Most patients do not realize that they have lung cancer thus the treatment is sometimes too late. A prediction method with a high degree of accuracy is needed to detect lung cancer earlier. Previous research used data mining calcification methods with the Naïve Bayes algorithm to predict lung cancer. This research resulted in high recall values for the positive class (Yes class) but low for the negative class (No class). This research was made using the Random Forest algorithm which is known to have good performance. The modeling is optimized by applying the K-fold Cross Validation technique. The Random Forest algorithm produces a higher Accuracy value than the Naïve Bayes algorithm, which is 98.4%. This algorithm produces 100% Recall for the positive class, 80% for the negative class and provides a 100% correct prediction as can be seen from the AUC value of 1. Although a statistical test with a significance level of 5% shows the results of the two algorithms are not significantly different.

Karakteristik Struktur Kristal In2Se3 Hasil Preparasi Dengan Metode Bridgman

Sun, 29 Jan 2023 16:47:13 +0700

Apart from using silicon material, thin-layer solar cells can be made from various types of semiconductor materials, such as a combination of groups III and VI. In solar cell applications, these materials are usually used as n-type coatings. This study not only aimed to determine the crystal structure and the effect of annealing temperature on the crystal lattice parameters but also to determine the chemical composition and surface morphological structure of the crystals formed from the preparation. The crystal growth process was carried out using the Bridgman method with different heating patterns. The temperature in both annealing temperatures is 200oC and 250oC. The physical properties of the prepared In2Se3 crystals were characterized using XRD, SEM, and EDAX. XRD Characterization was used to determine the crystal structure, while SEM and EDAX characterization was used to determine the surface morphology and chemical composition of the crystals. The result of the XRD characterization showed that the formed In2Se3 crystals were polycrystals with a hexagonal structure. Based on the diffractogram obtained, the In2Se3 crystalline heating 1 has better quality. EDAX analysis showed that the In2Se3 crystals were composed of elements of In and Se with a mole ratio of 2:9, while the SEM characterization showed that the color of the surface morphology of the In2Se3 crystals was not homogeneous.

Rancang Bangun Rangka dan Penggerak Mesin FDM Berbasis Arduino Tipe XZ-Head

Sun, 29 Jan 2023 18:05:03 +0700

FDM is an AM method that is currently being developed due to the flexibility of the object geometry that can be formed. This study aims to design the frame and drive of the XZ Head type FDM engine. Stress simulation was carried out to determine the safety factor in the frameXZ design. Lead screw parameters in the form of torque, shear stress, axial stress, and critical load were calculated to determine the torque requirement of the driving motor. The value of the linear axis of the stepper motor was calibrated to determine the dimensions of the printed output. Based on the simulation, the dynamic and static stresses on the XZ frame were 1.9 MPa and 2 MPa. The yield strength was 55 MPa with a safety factor of 28. The results of the calculation of the lead screw torque (TR) and (TL) were 18.27 N.mm and 6.60 N.mm. The calculated nominal shear stress of the screw () was 0.43 N/mm2, the axial loading stress () was -0.62 N/mm2, and the critical load (Wcr) was 9986.41 N. The difference in dimensions of the measurement results in the X and Z planes was 0.22 and 0.17 mm larger than the target dimensions of 20 mm.