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Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Semarang Alamat Redaksi: Jl.Soekarno-Hatta, Tlogosari, Semarang, Jawa Tengah, Indonesia 50196 Telp: 024-6702757 psw: 8302 Fax: 024-6702272 e-mail: jprt@usm.ac.id
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Jurnal Pengembangan Rekayasa dan Teknologi
Published by Universitas Semarang
ISSN : 14109840     EISSN : 25808850     DOI : http://dx.doi.org/10.26623/jprt
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Mechanical Engineering Transportation
Jurnal Pengembangan Rekayasa dan Teknologi ( JPRT ) is a scholarly refereed research journal that aims to promote the theory and practice of technology, innovation, and engineering management. The journal links engineering, science, and management disciplines. It addresses the issues involved in the planning, development, and implementation of technological capabilities to shape and accomplish the strategic and operational objectives of an organization. It covers not only R&D management but also the entire spectrum of managerial concerns in technology-based organizations. This includes issues relating to new product development, human resource management, innovation process management, project management, technological fusion, marketing, technological forecasting, and strategic planning. The journal provides an interface between technology and other corporate functions, such as R&D, marketing, manufacturing, and administration. Its ultimate goal is to make a profound contribution to theory development, research, and practice by serving as a leading forum for the publication of scholarly research on all aspects of technology, innovation, and engineering management.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 10 Documents
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Search results for , issue "Vol 13, No 2 (2017): Desember" : 10 Documents clear
OTOMATISASI PENYIRAMAN TANAMAN DENGAN METODE SAW MENGGUNAKAN ARDUINO BERBASIS WEB Atmoko Nugroho; April Firman Daru; Agus Edy Cahyono
Jurnal Pengembangan Rekayasa dan Teknologi Vol 13, No 2 (2017): Desember
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/jprt.v13i2.932

Abstract

Plants need water to grow and develop. Planting crops in the home environment can provide many benefits, including ensuring the availability of oxygen in the family, as a natural cooling of the house, and as a storage groundwater if the plants get watering and routine maintenance, the benefits derived from plants will be perceived by the family. Using clean water to water the plants every day is a wasteful behavior of water, because water is used for everyday purposes. In addition, the dense activities result in the existing plants at home tend to be lazy to water the plants. Well-groomed plants can provide adequate oxygen for the family.Many ways can be done to solve problems, using soil moisture sensors and temperature sensors to monitor the state of the plant at home, to determine the time of watering using decision support system with the method of SAW (Simple Additive Weighting) to determine the time of watering based on the results of the sensor readings on plants. The existence of this system can be saving water used for watering plants, and plants in the house fulfilled water needs, the benefits of plants can be felt.
AHP COMPARATIVE JUDGEMENT ON MOBILE COMMERCE COMPUTER SHOP APPLICATION IN SEMARANG CITY USING GOOGLE MAPS API BASED ANDROID April Firman Daru; Khoirudin Khoirudin; Muhammad Faizal Agung Widodo
Jurnal Pengembangan Rekayasa dan Teknologi Vol 13, No 2 (2017): Desember
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/jprt.v13i2.937

Abstract

In terms of activities in computer stores, many potential customers who come, then go home without making a transaction. This happens because consumers who come to the store want to know the price information, brand stock, and promotion first and then compare it with other stores. The decision recommendations generated by AHP are approaching expectations as they are examined from different perspectives and this method is very applicable to anyone decision makers because input is not only based on logic in general, but also intuition. The prototyping model implements rapid development and testing of the working model of new applications through repeated interaction processes. The object priority used based on AHP Comparative Judgment inference system calculation is (1) stock; (2) price; (3) distance (location). the process of comparison between criteria has been performed in a consistent manner consistent with the random consistency index of the normative analytical hierarchy process comparative judgment matrix. So that the output list that is displayed to the user can be used as the best reference product selection. Implementation of computer information system store application in Semarang City with AHP (Analyitical Hierarchy Processs) Comparative Judgment method can be accessed by Android users to recommend products to be purchased based on the criteria of availability of goods, price and distance practically anytime and anywhere.
EKSTRAKSI ANTOSIANIN KULIT MELINJO MERAH DAN STABILITAS WARNANYA PADA BERBAGAI LAMA PEMANASAN Elly Yuniarti Sani; Bambang Kunarto
Jurnal Pengembangan Rekayasa dan Teknologi Vol 13, No 2 (2017): Desember
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/jprt.v13i2.928

Abstract

Pigmen merah antosianin kulit melinjo bersifat antioksidan dan lebih aman dibandingkan dengan pigmen sintetik. Untuk mengekstraksi pigmen antosianin kulit melinjo perlu dipilih pelarut yang aman dan menghasilkan rendemen tinggi dengan kualitas warna dan  aktivitas antioksidan yang baik. Tujuan penelitian ini adalah untuk  mengekstrak antosianin kulit melinjo merah menggunakan berbagai rasio etanol:  air dan mengetahui stabilitas warna dan aktivitas antioksidatif  antosianin pada berbagai lama pemanasan. Ekstraksi dilakukan menggunakan rasio pelarut etanol:air dengan perbandingan (100:0); (75:25); (50:50); (25:75); (0:100). Ekstrak antosianin dianalisis rendemen, antosianin dan aktifitas antioksidannya. Hasil terbaik dipakai sebagai penelitian tahap kedua dengan mengukur stabilitas warna antosianin dan aktivitas  antioksidatifnya berbagai lama pemanasan (10, 20, 30, 40 dan 50 menit).    Hasil penelitian menunjukkan bahwa pelarut etanol dan air  dengan rasio (100:0)) menghasilkan ekstrak  antosianin kulit melinjo merah terbaik dengan rendemen 12,95%, kadar total antosianin 43,52 mg/L dan aktivitas  antioksidan (penghambatan DPPH) 66,29%. Ekstrak  antosianin kulit merah antosianin  stabil pemanasan 10-30 menit.
Pengaruh Waktu Ekstraksi dan Konsentrasi Ekstrak Rambut Jagung (Corn Silk) Terhadap pH, Total Fenol Dan Aktivitas Antibakteri Haslina Haslina; Sri Untari
Jurnal Pengembangan Rekayasa dan Teknologi Vol 13, No 2 (2017): Desember
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/jprt.v13i2.933

Abstract

The growth of microorganisms in foodstuffs can lead to profitable changes such as nutritional improvements in food, digestibility or storage. In addition, the growth of microorganisms in food can also lead to undesirable physical and chemical changes, so the food is not worth consuming. Staphylococcus aureus and Escherichia coli are the bacteria that often cause infection in humans. To prevent this it is necessary to have bioactive components that can inhibit the growth of microorganisms. Active compounds such as saponins, triterpenoids, phenols, tannins, flavonoids and alkaloids are known to have antibacterial activity. Several studies have reported the chemical content found in corn hair. Corn hair is part of a corn plant that has not been used effectively because it is considered as waste. Based on research, corn hair contains proteins, vitamins, carbohydrates, calcium salts, potassium, magnesium, and sodium, essential oils, steroids such as sitosterol and stigmasterol, alkaloids, saponins, tannins, and flavonoids. So presumably corn hair extract has antibacterial activity.This study aims to determine the effect of extraction time and concentration of corn hair extract on pH, total phenol and antibacterial activity.The experimental design used in this study was Randomized Block Design (RBD) with 3 replications. The treatments used were Extraction Time A1 = 30 minutes, A2 = 40 minutes, A3 = 50 minutes and Concentration Extract (material: solvent) K1 = 75% (w / v), K2 = 50% (w / v), K3 = 25% (w / v). Furthermore, the data obtained were analyzed variant and if there was any difference between treatments followed by Duncan Multiple Range Test (DMRT) test at 5% level. The results showed that all treatments produced bioactive compounds and formed inhibit zone of each test bacteria. The best time to obtain an antibacterial antibacterial extract on corn hair is 50 minutes. This was supported by the lowest pH average of 5.1 and the highest mean total phenol obtained from treatment A3 (50 minutes) was 7288,64 μgGAE / g and at 75% concentration formed the largest bacterial inhibition zone in each test bacteria.
Physichochemical charactheristics and organoleptics of Chayote leather in various sugar and CMC concentration Endang Bekti K; Sri Haryati; Aldila Sagitaning Putri
Jurnal Pengembangan Rekayasa dan Teknologi Vol 13, No 2 (2017): Desember
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/jprt.v13i2.929

Abstract

Chayote (Sechium edule) is a vegetable fruit with nutritional content, rich in minerals and vitamins. The high potassium content in chayote has the potential as a food for high blood pressure reduction, with calcium and vitamin C are quite good. In diversification  processed food products chayote  have not been used as a many processed product, usually chayote use as side dish vegetables or  processed as a sweets. Leather is a type of sweets in a sheet, generally made from fruits raw materials, chayote can be used as an alternative material for leather because chayote has a pectin content similar as a fruits, which chayote can be used as a substitute of fruits  in the processed of fruit leather. The research aims is to determine the effect of differences in sugar and CMC concentrations to the physical, chemical and organoleptic properties of chayote leather. Experiment design used a Factorial with Randomized Complete Block Design (RCBD) in 2 factors, first factor is a sugar concentration with 3 levels and second factor of CMC concentration with 2 levels. The First factor of sugar concentration G1 = 5% G2 = 10% G3 = 15%. The second factor of CMC concentration C1 = 0.5% C2 = 1%, repeated 3 times. The variables observed were,tensil strength, content of  moisture, sugar, fiber, potassium, calcium, vitamin C and organoleptics test on elasticity, preference for fruit leather of chayote.The analysis results, there are an influences of  concentrations sugar and CMC on the content of water, sugar, fiber, potassium and calcium but does not affect the tensil strength, vitamin C and panelist preferences on the texture and delight of chayote leather. Interactions occur between sugar and CMC concentrations to  content of potassium and calcium The best chayote leather is the leather with 15% sugar concentration and 1% CMC with characteristics of elasticity in 21,34 N, 12.59% water content, 37,392% sugar content, 4,049% fiber, potassium 207,71 mg/100g, calcium 19,5 mg/100g, vitamin C 7,14 mg / 100g, according to the panelist assessment that chayote leather are chewy and delight with concentration of 10% sugar and 0.5% CMC.
PERBEDAAN PENGARUH PEMBERIAN ANGKAK DALAM PEMBUATAN SOSIS AYAM TERHADAP SIFAT FISIK DAN ORLAB Sudjatinah Sudjatinah; C. Hari Wibowo
Jurnal Pengembangan Rekayasa dan Teknologi Vol 13, No 2 (2017): Desember
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/jprt.v13i2.934

Abstract

Sosis daging ayam adalah bahan pangan yang berasal dari potongan kecil daging ayam yang digiling dan diberi bumbu. Bahan sosis yang digunakan adalah daging ayam, karena daging merupakan white meat jadi terlihat pucat jika diolah menjadi sosis berbeda dengan sosis daging sapi, oleh karena itu dilakukan penambahan pewarna alami yang aman dikonsumsi yaitu angkak. Tujuan dari penelitian ini adalah untuk mengetahui perbedaan pengaruh konsentrasi angkak sebagai pewarna alami terhadap sifat fisik dan orlab sosis daging ayam.Metode yang digunakan dalam penelitian ini adalah metode experimental laboratories. Faktor perlakuan yang diterapkan adalah tanpa penambahan angkak (0 %) dan penambahan angkak 1,5 %.  Variabel yang diamati yaitu sifat fisik (kadar air, cooking loss), kekenyalan dan orlab. Data yang diperoleh dianalisis menggunakan t test.   Hasil penelitian yang telah dilakukan menunjukkan bahwa perlakuan penambahan angkak dengan konsentrasi yang berbeda dalam pembuatan sosis daging ayam afkir (sebagai pewarna alami) berpengaruh nyata (p<0,05) terhadap rata-rata cooking loss tetapi tidak berbeda pada rata-rata kadar air dan kekenyalan. Penambahan angkak dengan konsentrasi 1,5% pada pengolahan sosis daging ayam (sebagai pewarna alami) menghasilkan karakteristik mutu sosis daging ayam yang lebih baik dengan syarat mutu sosis daging ayam dibandingkan tanpa penambahan angkak. 
ANALISIS TINGKAT KEBISINGAN TERHADAP AKTIVITAS BELAJAR MENGAJAR DI FAKULTAS TEKNIK UNIVERSITAS SEMARANG Fahrudin Ahmad; Iryan Dwi Handayani; Srihera Nurweni
Jurnal Pengembangan Rekayasa dan Teknologi Vol 13, No 2 (2017): Desember
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/jprt.v13i2.930

Abstract

Kegiatan pembelajaran atau belajar mengajar yang optimal sangat membutuhkan lingkungan yang kondusif, dan tenang karena dibutuhkan konsentrasi yang cukup tinggi pada prosesnya. Kawasan lingkungan kampus memerlukan lingkungan yang tenang dan tidak bising. Wilayah perkotaan sulit untuk mendapatkan lokasi kampus yang tenang. Penelitian ini mencoba mengungkapkan bagaimana evaluasi pada faktor kebisingan yang terjadi selama proses belajar mengajar. Penelitian dilakukan di Universitas Semarang. Metode penelitian yang digunakan adalah metode deskriptif analitik.Penelitian menunjukkan bahwa gedung perkuliahan fakultas teknik (gedung A) Universitas Semarang menunjukkan tingkat kebisingan dari baku kebisingan yang telah ditetapkan sesuai dengan (Standar Kualitas Akustik Bangunan Sekolah). Selain itu pihak Universitas Semarang harus menetapkan aturan dan kebijakan untuk mengendalikan tingkat kebisingan yang dibakukan, untuk meningkatkan kenyamanan pada proses perkuliahan.Dari hasil penelitian Tingkat  kebisingan  di  area  gedung  A fakultas teknik Universitas Semarang belum  sesuai  dengan standar baku yang telah ditetapkan yaitu masih lebih besar dari (55 dB).
ANALISIS PENGARUH KUALIFIKASI KONTRAKTOR TERHADAP KUALITAS PEKERJAAN PROYEK KONSTRUKSI DI KOTA SEMARANG Lila Anggraini; Diah Rahmawati; Trias Widorini
Jurnal Pengembangan Rekayasa dan Teknologi Vol 13, No 2 (2017): Desember
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/jprt.v13i2.935

Abstract

The law on construction services has been in effect for seventeen years, but the world of construction services in Indonesia has not been very exciting, especially for construction workers for large-scale and high-tech projects. Indonesia's workforce is still considered not to have capability comparable with foreign construction workforce.To realize the success of quality buildings and able to function as planned, needed human resources of good quality as well.And the professional ability of the construction workforce is evidenced by the possession of a skill or skill certificate. As mandated by the Construction Services Act No. 18 of 1999 article 9. that any individual employed by a business entity as a construction planner or supervisor of a particular construction or energy in a construction business enterprise shall have a certificate of expertise.Based on the research factors that most affect the application of Construction Services Act of 1999 memnai certificate of competence of experts on the implementation of construction work.is a factor of human resources such as education experts, experience, training, age and ownership of certificates. Another factor is the method of implementation of work such as coordination and decision making, while the political factor is the regulation of rules and leadership factors, such as motivation and awards To know how far and how big the role of these construction service experts in achieving the success of construction work, so much in demand by both local and foreign workers, it is deemed necessary to research the role of experts in contributing to the success of a construction work.Therefore it is necessary to develop further research on the readiness of experts in terms of the fulfillment of the requirements and expertise, in order to obtain the predicate of professional engineers or professional engineers through certification of expertise held by professional associations that followed.
DESAIN SISTEM ROOFTOP OFF GRID PANEL SOLAR PHOTOVOLTAIC Harmini Harmini; Titik Nurhayati
Jurnal Pengembangan Rekayasa dan Teknologi Vol 13, No 2 (2017): Desember
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/jprt.v13i2.931

Abstract

Pada saat ini hampir semua rumah tempat tinggal menggunakan sumber energi dari jaringan PLN. Sumber energi listrik yang disediakan oleh PLN sebisa mungkin dilakukan penghematan dalam pemakaian listrik. Salah satu cara yang digunakan adalah setiap rumah menggunakan Roof top panel solar photovoltaic, hal ini bertujuan untuk mengurangi ketergantungan sumber energi dari PLN. Berdasarkan hal tersebut maka perlu dilakukan perancangan dalam pengaplikasian Roof top solar panel. Pada penelitian ini akan dirancang sistem Roof top off grid panel SPV sebagai sumber alternatif energi listrik. Perancangan diperuntukkan untuk sistem Solar Home System (SHS) atau rumah tempat tinggal dengan acuan radiasi matahari di wilayah Jawa Tengah. Sistem rooftop off grid solar photovoltaic dirancang dengan menggunakan komponen panel SPV, baterai, inverter dan charge controller. Kapasitas daya yang dirancang adalah 1.576,2 Watt dan konsumsi energi per hari sebesar 4.260 Wh Jumlah baterai sebanyak 12 unit dengan kapasitas masing-masing 310 Ah, panel SPV sebanyak 6 Unit kapasitas 225 Wp, inverter  1 unit sebesar 1000  Watt dan charge controller 1 unit sebesar 40 A. Sudut kemiringan sebesar 16 derajat. Estimasi biaya investasi yang dikeluarkans sebesar Rp.62.000.000,-
ANALISIS TEKSTUR PHOTO LAMA MENGGUNAKAN FITUR TEKSTUR GRAY LEVEL CO-OCCURRENCE MATRIKS PADA PEWARNAAN CITRA OTOMATIS Muhammad Sipan; Rony kartika Pramuyanti
Jurnal Pengembangan Rekayasa dan Teknologi Vol 13, No 2 (2017): Desember
Publisher : Universitas Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26623/jprt.v13i2.936

Abstract

Pengolahan citra merupakan hal penting pada sebuah proses pengenalan, klasifikasi atau segmentasi atau proses lain. Satu hal yang dapat dilakukan adalah analisis fitur tekstur yang berhubungan dengan photo lama dalam hal ini photo grayscale. Objek penelitian dapat berupa photo (citra) lama dan menggunakan  metode statistikal berbasis Gray Level Cooccurrence Matrix (GLCM) .GLCM adalah salah satu metode yang digunakan untuk ekstraksi fitur tekstur, beberapa tekstur yang ada di analisis menggunakan glcm dengan membandingkan fitur tektur GLCM pada photo lama dengan photo aslinya                   Proses pewarnaan yaitu memberikan visualisasi lebih pada sebuah objek, dapat berupa citra atau video monokrom dengan tujuan untuk memberikan detail dan kejelasan dari citra atau video yang diwarnai. Penelitian membahas citra grayscale untuk diwarnai, kemudian mencari nilai-nilai fitur tekstur GLCM. Besar kecilnya nilai fitur yang diperoleh dari perhitungan digunakan untuk mencari seberapa besar nilai error yang secara tidak langsung menunjukan seberapa besar kemiripan citra tersebut. Pengukuran keberhasilan besar kecilnya kemirirpan menggunakan metode Mean Square Error (MSE) dan Mean Absolute Error (MAE).

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