Portal Jurnal Politeknik Negeri Semarang
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RANCANG BANGUN SISTEM INFORMASI GEOGRAFIS (GIS) PERANGKAT TERMINAL FIBER OPTIK DENGAN SIMULASI GANGGUAN BERBASIS WEB
Get PDFSaat ini Fiber optik menjadi media transmisi utama dalam bidang telekomunikasi. Karena banyaknya perangkat dengan lokasi yang tersebar luas, seringkali kesulitan menemukan secara cepat lokasi perangkat-perangkat fiber optic sesuai koordinat, nama jalan, serta informasi lain, hal ini karena data tersebut disimpan dalam file excel. Untuk menyelesaikan masalah ini dibuat aplikasi sistem informasi geografis fiber optik yang dilengkapi dengan rangkaian sensor simulasi gangguan. Semua data perangkat fiber optik ditampilkan dalam peta geografis dalam bentuk marker-marker. Disamping itu jika terdapat gangguan pada perangkat, sistem informasi yang dibangun dapat menampilkan marker perangkat yang mengalami gangguan pada peta geografik fiber optik sesuai koordinatnya. Sistem informasi ini juga dilengkapi dengan fasilitas input data, update data dan hapus data fiber optik, serta menampilkan rekam jejak tiap perangkat (gangguan, pergantian, perbaikan), melalui jaringan internet.Currently, optical fiber is the main transmission medium in the telecommunications sector. Due to the large number of devices with widely dispersed locations, it is often difficult to quickly find the location of fiber optic devices according to coordinates, street names, and other information, this is because the data is stored in an excel file. To solve this problem, an optical fiber geographic information system application is made which is equipped with a series of disturbance simulation sensors. All fiber optic device data is displayed on a geographic map in the form of markers. In addition, if there is interference with the device, the information system built can display the marker of the device experiencing interference on the optical fiber geographic map according to its coordinates. This information system is also equipped with data input facilities, data updates and optical fiber data deletion, as well as displaying the track record of each device (interference, replacement, repair), via the internet network
PERILAKU SELF COMPACTING CONCRETE TERHADAP VARIASI BAHAN SUBTITUSI SEMEN MENGGUNAKAN ABU SEKAM PADI DAN KAPUR
Get PDFPerforma SCC sebagai beton dengan workability yang baik sangat membantu pelaksanaan proyek pada saat pengecoran sehingga pekerjaan dapat dilakukan dengan cepat cepat dan tanpa perlu dipadatkan, sehingga dapat dicapai efisiensi terhadap baiaya dan waktu. Keterbatasan jumlah semen yang tersedia di seluruh dunia menjadikan para pelaku konstruksi mencari alternatif lain sebagai bahan pengganti semen, sehingga kebutuhan akan semen bisa di ganti sebagian menggunakan material lain. Abu sekam padi dan kapur merupakan salahsatu bahan yang memiliki perilaku mirip semen meskipun ada kekurangan dan kelebihannya terutama untuk beton inovasi seperti SCC. Pada penelitian ini akan mengkaji tentang perilaku SCC jika menggunakan abu sekam padi dan kapur sebagai bahan subtitusi semen yang diharapkan mampu memberikan efek yang lebih baik. Penelitian yang dilakukan membagi variasi abu sekam padi dan kapur terhadap semen sebagai berikut: variasi 1 (10%,30% dan 60%), variasi 2 (7,5%,25% dan 67,5%), variasi 3 (5%,20% dan 75%). Berdasarkan nilai uji workability beton segar SCC diperoleh dominan variasi 3 yang memiliki performa terbaik, kemudian berdasarkan hasil kuat tekan SCC terbaik juga diperoleh hasil variasi 3 menghasilkan kuat tekan tertinggi yaitu 25,57 MPa.Kata kunci : beton memadat mandiri, workability, kuat tekan Performance of SCC as concrete with good workability really helps the implementation of the project at the time of casting so that work can be done quickly and without the need for compaction, so that cost and time efficiency can be achieved. The limited amount of cement available around the world makes construction workers look for other alternatives as cement substitutes, so that the need for cement can be partially replaced using other materials. Rice husk ash and lime are materials that have a cement-like behavior although there are advantages and disadvantages, especially for innovative concretes such as SCC. In this study, we will examine the behavior of SCC when using rice husk ash and lime as cement substitution materials which are expected to provide a better effect. This research divides the variation of rice husk ash and lime on cement as follows: variation 1 (10%, 30% and 60%), variation 2 (7.5%, 25% and 67.5%), variation 3 (5%, 20% and 75%). Based on the workability test value of SCC fresh concrete, it was obtained that variation 3 had the best performance, then based on the results of the best SCC compressive strength, variation 3 resulted in the highest compressive strength of 25.57 MPa.Keywords : self compacting concrete, workability, compressive strengt
Statistical Process Control And Analytical Hierarchy Process Methods For Reducing Earth Resistance
Get PDFSecurity or protection systems at generators, substations, transmission, and housing and others, especially to overcome lightning disturbances and leakage currents, the earthing system must meet the required standards. For each part of the system, from transmission, substation and residential electricity utilization as well as other parts, the standard of earth resistance is not the same, for example for housing a maximum of 5 Ω, for a small generator system a maximum of 10 Ω, for a large generator a maximum of 20 Ω and so on etc. In areas where the soil type resistance is high, it is necessary to reduce the value of the earth resistance so that it reaches the Indonesian national standard. There are many ways to reduce the value of earth resistance, including lowering soil resistivity, adding electrodes to the soil, changing the type of electrode and its diameter, and so on. The aim of the research was to determine the effect of the value of earthing resistance on the depth of electrode planting and the type of soil that is affected by the water content in the soil and to apply simple statistical tools, namely Statistical Process Control (SPC) and Anlytical Hierarchy Process (AHP).The measurement method in this research uses a three-point system, namely one point for the test electrode and two points for the auxiliary electrode and the measuring instrument used to measure earth resistance is a digital earth resistance tester type digital model 4105A. This tool is designed according to international electrical commission (IEC) standards. To analyze reducing earth resistance using Statistical Process Control (SPC) and Analytical Hierarchy Process (AHP) methods. The design of this research is to answer the problems and research objectives that have been planned, namely to determine the effect of soil type on earth resistance and to analyze efforts to reduce the value of earth resistance to achieve standards with statistical process control (SPC) and analytical hierarchy process (AHP) methods. To find potential causes, it is done by calculating the analytical hierarchy process (AHP) in order to obtain a sequence of problems to be solved. If the consistency ratio value is more than 10%, then the data judgment must be corrected, but if the consistency ratio is less than or equal to 10% then the calculation results are declared correct or accepted. From the results of the AHP calculation, it is then verified by testing the earth resistance
Influence of Product Quality and Brand Image on Purchasing Decisions at My Bakery in Semarang City
Get PDFThe easier the culinary business is, the more competition it has to face, including the bakery culinary business. The tight competition between these business actors continues to try hard to retain consumers and get new consumers to buy their products. Along with the increasingly intense competition, it has led to purchasing decision behavior made by consumers. The purpose of this study was to analyze the effect of product quality and brand image on purchasing decisions, both simultaneously and partially. The research sample was 78 respondents selected using purposive sampling technique. This study uses the Purposive Sampling method with 78 respondents as the sample. The data collection methods used are interviews, questionnaires and literature studies. The results showed that partially the product quality variable had a significant effect on purchasing decisions and brand image had a significant effect on purchasing decisions. The result of the calculation of the coefficient of determination between the variables of product quality and brand image on purchasing decisions is 0.645, this means that product quality and brand image have an influence of 64.5% on purchasing decisions, the remaining 35.5% is determined by other variables not examine
PROTOTYPE AIR CONDITIONING MONITORING AND CONTROL SYSTEM FOR SMART CLASSROOM BASED ON THE INTERNET OF THINGS
Get PDFElectricity wastage is a growing concern, often resulting from human behavior. One common scenario is the continuous operation of a high-powered air conditioner (AC) even when it's unnecessary. Moreover, extended AC usage can accelerate wear and tear, potentially damaging the unit. To address these issues, a remote monitoring and control device based on the Internet of Things (IoT) concept is crucial. This device can connect to smartphones, allowing users to remotely monitor and control AC usage. Through an AC simulator, the system enables monitoring and control via a telegram system linked to the smartphone. Developed using the waterfall method and utilizing the NodeMCU ESP8266 microcontroller, the prototype proves effective in assisting users in monitoring and controlling AC usage. Particularly useful when users are away from the AC location and inadvertently forget to turn it off, the system mitigates unnecessary electricity wastage. By implementing this solution, energy efficiency is promoted, and the lifespan of AC units is extended. With the potential to reduce electricity wastage, this technology contributes to a more sustainable future
FAKTOR-FAKTOR YANG MEMPENGARUHI PEMBIAYAAN MUDHARABAH PADA BANK UMUM SYARIAH
Get PDFAbstrak: This study aims to analyze the significance of the effects of the factors of TPF, CARa, NPFa, and FDRa that influence on Mudharabah Financing of Islamic Commercial Banks for the 2018-2021 Period, either simultaneously or partially. The population of this study is all Islamic Commercial Banks in Indonesia totaling 12 BUS, while the sample in this study was selected using purposive sampling technique resulted in 6 (six) BUS that meet the criteria, including Bank Muamalat Indonesia, Bank Victoria Syariah, Bank BJB Syariah, Bank Panin Dubai Syariah, Bank Bukopin Syariah, and Bank BCA Syariah. The analysis model in this study uses the Multiple Linear Regression Analysis Model. The analysis technique uses the F test, the coefficient of determination test (R2), and the t test which is processed using the SPSS 25.00 program. The results of proving the hypothesis and the discussion in this study show that TPF, CAR, NPF, and FDR simultaneously have a significant effect on Mudharabah Financing for Islamic Commercial Banks for the 2018-2021 Period. While the results of the partial analysis show that TPF, CAR, and FDR each have a positive and significant effect on Mudharabah Financing. While the NPF partially has a negative and significant effect on Mudharabah Financing for Islamic Commercial Banks for the 2018-2021 Period
ANALISIS PERHITUNGAN BIAYA KUALITAS (COST OF QUALITY) UNTUK MENINGKATKAN KUALITAS PRODUK
Get PDFAbstract : The purpose of this study was to analyze the components of quality costs and calculate the quality costs that occur in ED aluminum with the aim of improving product quality by reducing product defects. This research was conducted by identifying and calculating the cost of quality using the Prevention, Appraisal, and Failure (PAF) method. The research approach used is qualitative research with a case study approach. The object of this research is ED Aluminum, which is the largest aluminum craftsman in Yogyakarta and smelts aluminum into finished goods. The results of this study indicate that ED Aluminum already has activities that are used to improve the quality of the products they produce. Costs incurred to improve quality are employee and partner counseling costs, printing equipment manufacturing costs, machine maintenance costs, raw material inspection costs, work-in-progress inspection costs, finished product testing costs, rework on defective products, and warranty costs. The weakness of the PAF model classification is that it is only able to detect quality costs in financial reports and cannot describe costs that are difficult to identify (hidden costs). Suggestions for further research include explaining hidden costs
PENGEMBANGAN SISTEM INFORMASI PERAWATAN PERALATAN PRAKTIK PERAWATAN DAN PERBAIKAN DI JURUSAN TEKNIK MESIN POLINES
Get PDFProses perawatan peralatan praktik pada laboratorium perawatan dan perbaikan yang ada diJurusan Teknik Mesin Politeknik Negeri Semarang pada saat ini masih dilaksanakan secarakonvensional meski sudah dalam bentuk data komputer. Hal ini menyebabkan tidakefektifnya layanan kebutuhan proses pembelajaran. Guna meningkatkan kinerja sistemperawatan dan perbaikan peralatan praktik pada laboratorium ini, maka perludikembangkan sebuah sistem informasi yang terintegrasi antara pengguna dengan sebuahsistem yang dapat memuat berbagai informasi di laboratorium perawatan. Tujuan daripenelitian ini adalah Mengembangkan Sistem Informasi Perawatan Peralatan PraktikPerawatan dan Perbaikan di Jurusan Teknik Mesin Polines. Metode yang digunakan adalah Pengebangan Beroreintasi Obyek yang meliputi tahap-tahap: Inception (Pendahuluan),Elaboration (Pengembangan), Construction (Pembangunan), dan Transition (Peralihan).hasil diperoleh sebuah sistem informasi perawatan yang memiliki validitas dankebergunaan yang baik, memiliki efisiensi, isi, kehadalan yang cukup baik dan memberikankepuasan yang sangat tinggi bagi pengguna
Analysis of The Utilization of Solar Panels as Pump Crusters Automatically in Fish Pond Farming
Get PDFAbstract”” The purpose of making this final task is to apply the solar power system as a source of electrical energy to move the water pump automatically in fish ponds. This system works automatically with the Water Level Control tool sensor (WLC), so that if the water level drops or rises then the water pump will automatically work. On this automated system use the Smart Relay SR2B121BD and the ZelioSoft 2 application. Data retrieval carried out at 10.00 -14.00 WIB, obtained data pumps 1 and 2 for a height of 1 cm for 30 minutes and a height of 2 cm for 70 minutes. The amount of discharge the pump produces 1 and 2 ranges from 37 L/M to 45 L/M. Pump 1 Test results obtained an average efficiency of 7.68%, with the highest efficiency of 11.03% and the lowest efficiency of 5.26%, while the average pump efficiency of 2, 7.05% with the highest efficiency of 10.66% and the lowest efficiency of 5.41%. The average efficiency of the solar panels is 11.20% with the highest efficiency of 14.60% and the lowest efficiency of 7.29%.
Effect of Sales, Current Ratio, Debt to Assets Ratio and Company Size on Company Profitability
Get PDFThis research was based on the issues of property and real estate sector companies listed on the Indonesia Stock Exchange (IDX), namely the decline in profitability for the period 2017-2021. This research aims to examine the effect of the independent variables is Sales, Current Ratio (CR), Debt to Assets Ratio (DAR), and Firm Size on Profitability. The sample in this research were 14 property and real estate companies listed on the Indonesia Stock Exchange (IDX) in the 2017-2021 period which were selected using the purposive sampling method. The data analyzed used is 70 data (14 companies in 5 years of observation). Analysis model used in this research was multiple linear regression panel data analysis using Eviews 9.0. The results of the multiple linear regression analysis of panel data show that (1) the effect of sales on profitability is significant (2) the effect of the current ratio (CR) on profitability is not significant (3) the effect of debt to assets ratio (DAR) on profitability is not significant (4) The effect of firm size on profitability is significan