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Semesta Teknika
Published by Universitas Muhammadiyah Yogyakarta
ISSN : 1411061X     EISSN : 25025481     DOI : https://doi.org/10.18196/st
Core Subject : Engineering,
Engineering
SEMESTA TEKNIKA is a reputable refereed journal devoted to the publication and dissemination of basic and applied research in engineering. SEMESTA TEKNIKA is a forum for publishing high quality papers and references in engineering science and technology. The Journal is published by the Faculty of Engineering, Universitas Muhammadiyah Yogyakarta, INDONESIA. Copyright is by the publisher and the authors. The Journal is issued in electronic form and also issued in printed form as annual volume for the contributors only. The journal contains original research papers, review articles, short notes and letters to the editors. The topics of interest include modeling, experimental, analytical and numerical investigations on the mechanical, physical, chemical and mineralogical properties of material, developing the prototype/instrument, technology and construction process. Topic of management in industry and civil construction is also considered. SEMESTA TEKNIKA receives manuscripts from the contributor written in the Indonesian and English. Manuscripts submitted to the journal for publication must not have been previously published or is under consideration simultaneously by any other publication. Manuscripts submitted to SEMESTA TEKNIKA will be reviewed Peer Reviewers local and foreign.
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Articles 682 Documents
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Perancangan Dan Pembuatan Aplikasi Decision Support System Pada Departemen Hrd Dan Pembelian Dengan Menggunakan Metode Analytical Hierarcy Process (AHP) Setiawan, Alexander; Irawan, Muhammad Isa; Wijaya, Robin
Jurnal Semesta Teknika Vol 10, No 1 (2007): MEI 2007
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The rapidly technology process on globalisasion era in business world, makes the decision making is the important thing to make decision faced with the competition in business world. The decision making can be influence by a few aspect and group, which can influence the decision maker to accelerate the fast, perfectly and correctly the decision making. This software created by using Analytical hierarcy process method is doing calculation proses to get the best decision, using the score group of calculation and compare it with each possibility count of the choosen decision, this software specially for HRD and purchasing division, for HRD division this software will be use to decide which employee will be promoted or which employee will be fired. For purchasing division, this software will used to decude which supplier will be choose to buy a kind of goods. Employee mark, disipline mark, and  development ability  are the group that used for HRD division, while purchasing division use quality of goods, price, accuracy time shipping and supplier identity.Application the design and the testing of decision support system result a correct and flexsibel decision with all criteria which influence that decision and give a report in order to user can understand why this software choose that decision.      
The Analysis of CO2 Emission Reduction Scenarios in Industry Sector of Yogyakarta Province of Indonesia Al Hasibi, Rahmat Adiprasetya
Jurnal Semesta Teknika Vol 14, No 1 (2011): MEI 2011
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The final energy demand and energy-related CO2 emission in industrial sector of Yogyakarta Province were analyzed in this study. The potential of energy saving and reduction of CO2 emission were estimated. The analysis was based on energy model. The model was constructed by LEAP model that describe the pattern of energy demand in industrial sector. Energy modeling and scenario analysis were used to simulate the impacts of various policies in energy demand and CO2 emission. Three scenarios were implemented in the model. Initially, the model was developed under business as usual (BAU) scenario that include current situation of energy-related activity in industrial sector. 2008 was selected as base year with projection period was terminated in 2025. Then, two alternative scenarios were developed that focus on energy efficiency improvement (EE scenario) and fuel switching to cleaner fuel (FS scenario). The two alternative scenarios were integrated into mitigation scenario. The result of alternative and mitigation scenario compare to BAU scenario in term of the final energy demand and energy-related CO2 emission. The result of the model showed the potential of energy saving by implementing mitigation scenario is 24.16% compare to BAU scenario. The expected reduction of CO2 emission under mitigation scenario is 20.22% compare to BAU scenario.
Analisis Tingkat Kesuksesan Inspeksi Pada Attach Dan Packet Data Protocol (PDP) Context Layanan Gprs Dengan Metode Statistical Process Control Ikhsan, Muhammad; Nurudin, Ahmad
Semesta Teknika Vol 8, No 1 (2005): MEI 2005
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Penelitian ini dimaksud untuk mengetahui tingkat kesuksesan inspeksi yang dilakukan pada Attach dan PDP Context, sebab keberhasilan melakukan aktivasi awal GPRS dilihat dari kesuksesan MS melakukan Attach, untuk selanjutnya dapat diambil langkah perbaikan jika terjadi penurunan kualitas (non performance). . Metode yang dipakai adalah metode SPC (statistical process control) atau metode pengendalian kualitas suatu proses, untuk menunjukan apakah jumlah yang menunggu untuk dilayani dalam server GSN (GPRS Support Node)  masih dalam proporsi pengendalian.Hasilnya adalah hasil dari pengendalian proses kualitas proses statistik untuk GGSN dan SGSN Ericsson menunjukan bahwa masih terdapat proses yang berada diluar batas pengendalian. Sedangkan, hasil dari analisa kemampuan proses menunjukan bahwa untuk proses Attemp PDP Context dapat memenuhi spesifikasi bawah, sedangkan untuk proses Attemp Attach masih dapat memenuhi batas spesifikasi bawah.
Perilaku Geser pada Keadaan Layan dan Batas Balok Beton Bertulang Berlubang Memanjang Krasna, Wiku A; Sulistyo, Djoko; Supriyadi, Bambang
Jurnal Semesta Teknika Vol 13, No 2 (2010): NOVEMBER 2010
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I cross-section of reinforced concrete reduces weight and concrete needs, but the reduction in strength is not considerably large. In addition, I section reinforced concrete beam is relatively complicated and takes much longer time for manufacturing. Another geometric cross-section which results in equivalent weight reduction with that of I cross-section concrete beam may be hollow square crosssections of reinforced concrete beams. This research was conducted to identify and compare the behavior of the shear and dynamic effects of hollow core reinforced concrete beam with an I cross-section beam that equivalent with its. The specimens being tested were four reinforced concrete beams, of 2000 mm length, consisted of a T beam with bottom flange as control beam (BK) possessing dimensions of bfa = 600 mm, bw = 125 mm, bfb = 200 mm, h = 300 mm, tf = 100 mm, and three hollow core T beams as tested beam (BB1, BB2 and BB3) possessing dimensions of bf = 600 mm, bw = 200 mm, blubang = 75 mm h = 300 mm, tf = 100 mm. Static loading was applied by means of a hydraulic jack in a four-point loading system, were. Dynamic loading test was carried out by vibrating the beams to obtain the natural frequency, where the vibrating load were produced by a mechanical vibrator. Whilst the data on the static load carrying capacity was recorded at the first crack and at each initial additional crack until the ultimate fracture, those on dynamic loading was recorded on the solid block, at the first crack and at yield. The parameters being used was the magnitude of deflection, strain of the reinforcing steel and concrete, crack pattern and natural frequency. It can be concluded that the hollow core reinforced concrete beam can be used as an alternative to I section reinforced concrete beam. It was noticed that the difference in shear load carrying capacity between control beam (BK) and hollow beam (BB) was not considerably significant, where the difference between BK (299.3 kN) and BB1 (337.6 kN) is 12.79%, that with BB2 (350, 6 kN) or 17.14%, and that with BB3 (289.4 kN) or −3.31%. The natural frequency of BK is 58.594 Hz, 15.769% larger than the natural frequency of BB3 with 49.354 Hz. The natural frequencies of tested beam decreased with the increased of damage to the beam.
Analisis Rekayasa dan Karakterisasi Briket Bahan Bakar dari Limbah Serat Kenaf Sudarja, Sudarja
Jurnal Semesta Teknika Vol 12, No 1 (2009): MEI 2009
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The amount of rejected hibiscus cannabinus fiber reaches 30% during harvesting and 10% of the fiber bought by industries because they are not satisfied the quality requirement. In other words, 37% of the harvested hibiscus cannabinus fiber is rejected and become waste. On the other hand, the society need alternative fuel instead of fossil fuel due to its availability and high-price. Therefore, a study on the utilization of hibiscus cannabinus fiber waste for alternative fuel is urgently required. The main materials used in this research are hibiscus cannabinus fiber waste and starch glue. The first step is producing star-coal by burning the hibiscus cannabinus fiber in a closed tube (chamber) followed by producing starcoal briquette by blending starcoal powder and starch glue, and finally, pressing it in a pressing machine. The characteristic being studied are: water content (comply to ASTM-D-3173), calorific value (ASTM D-2015 and ASTM D-5865-03), and ash content (ASTM D-3174). The result of the research shows that the average calorific value of hibiscus cannabinus fiber waste is 6595,65 kal/gram while that of the briquette compacted  at 1090 psi or above was 7394,14 kal/gram. The average water content was 10,9%, and ash content is 31,67%. Advanced study concerning the percentage of fly ash and economic aspects was recommended in order to justify its feasibility.
Klasifikasi Wajah Kambing Peranakan Ettawa (PE) Jantan Berbasis Perseptron Chamim, Anna Nur Nazilah; Soesanto, Adhi; Soesanti, Indah
Semesta Teknika Vol 17, No 2 (2014): NOVEMBER 2014
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Goat Peranakan Ettawa ( PE ) is a kind of superior goat derived from goat crosses, between Ettawa (Jamnapari ) from India and Kambing Kacang (Bean Goat) from Java. A factor to determine quality of goat PE is it’s face. More than 30 cm ears length and the head color is black represents good quality. More better the quality of goat face, means higher selling price. In this study, male goat face is classified into class good quality, less good, and not good at data such as photo / image In the market, classification done by visual observation, so many farmers have difficulty in classifying the face of a goat. For that purpose, a system is needed that capable for classifying a goat face to facilitate farmers in classifying.This classification system uses Perceptron Method, is a method of guided learning using characteristic as input those are ears length, black value and brown face value. Images are used as training images as much as 9 images, and test images are 20 images. This system could classificating PE goat face with success rate of 95% and 1 error from 20 testing images. Error occured because the background was detected as black and image taking that not precise.
Kekuatan Geser Campuran Tanah-Kapur-Abu Sekam Padi Dengan Inklusi Kadar Serat Karung Plastik Yang Bervariasi Widianti, Anita; Hartono, Edi; Muntohar, Agus Setyo
Jurnal Semesta Teknika Vol 10, No 1 (2007): MEI 2007
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Stabilisasi tanah secara kimia yaitu dengan penambahan kapur dan abu sekam padi mampu meningkatkan kekuatan gesernya, namun campuran tersebut cenderung berperilaku getas (brittle). Keadaan ini kurang memuaskan bila digunakan sebagai bahan konstruksi yang lebih menginginkan bahan berkekuatan tinggi tetapi berperilaku ductile. Kombinasi dari teknik perbaikan tanah secara kimia dan secara mekanis (yaitu dengan perkuatan serat-serat plastik) diharapkan akan memberikan hasil yang lebih baik. Tujuan dari penelitian ini adalah untuk mengkaji kuat geser tanah yang distabilisasi dengan kapur-abu sekam padi-serat plastik dengan berbagai variasi kadar serat  dan masa perawatan. Dalam penelitian ini digunakan tanah yang dicampur 12% kapur, 24% abu sekam padi dan serat karung plastik sebanyak 0,1%, 0,2%, 0,4%, 0,8%, dan 1,2% dari berat total campuran. Uji yang dilakukan adalah uji geser langsung pada saat benda uji berumur 7 dan 14 hari. Secara umum dengan adanya penambahan serat karung plastik dan masa perawatan, nilai kohesi, sudut gesek dalam, dan kuat geser mengalami peningkatan dibandingkan nilai pada tanah asli dan tanah yang hanya dicampur dengan kapur-abu sekam padi saja. Campuran tanah - kapur-abu sekam padi dan 0,4 % serat untuk masa perawatan 14 hari memberikan peningkatan nilai kuat geser tertinggi, yaitu sebesar 178,63 % dari nilai kuat geser tanah asli (pada σ = 12,59 kN/m2).
Model Power System Stabilizer Berbasis Neuro-Fuzzy Adaptif Ramadoni Syahputra, Agus Jamal ,
Jurnal Semesta Teknika Vol 14, No 2 (2011): NOVEMBER 2011
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Low frequency oscillations are detrimental to the goals of maximum power transfer and optimal power system security. A contemporary solution to this problem is the addition of power system stabilizers (PSS) to the automatic voltage regulators on the generators in the power system. For large scale power systems comprising of many interconnected machines, the PSS parameter tuning is a complex exercise due to the presence of several poorly damped modes of oscillation. The problem is further being complicated by continuous variation in power system operating conditions. This research proposes the PSS model based on adaptive neuro-fuzzy for designing robust power system stabilizers for a multi machine system. Simulations were carried out using several fault tests at transmission line on a Two-Area Multimachine Power System. Simulation is done by using Matlab-Simulink software. The result shows that power transfer response using the model is more robust than Delta w PSS, especially for single phase to ground fault.
In Situ Determination Of Layer Thickness And Elastic Moduli Of Asphalt Pavement Systems By Spectral Analysis Of Surface Waves (Sasw) Method Rosyidi, Sri Atmaja P; Ismail, Mohd Azmi; Samsudin, Abdul Rahim; Taha, Mohd Raihan; Rafek, Abdul Ghani; Nayan, Khairul Anuar Mohd
Jurnal Semesta Teknika Vol 8, No 2 (2005): NOVEMBER 2005
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Spectral analysis of surface waves (SASW) is a non-destructive and in situ method for determining the stiffness profile of soil and pavement sites. The method consists of generation, measurement, and processing of dispersive elastic waves in layered systems. The test is performed on the pavement surface at strain level below 0.001%, where the elastic properties are considered independent of strain amplitude. During an SASW test, the surface of the medium under investigation is subject to an impact to generate energy at various frequencies. Two vertical acceleration transducers are set up near the impact source to detect the energy transmitted through the testing media. By recording signals in digitised form using a data acquisition system and processing them, surface wave velocities can be determined by constructing a dispersion curve. Through forward modeling, the shear wave velocities can be obtained, which can be related to the variation of stiffness with depth. This paper presents the results of two case studies for near-surface profiling of two different asphalt pavement sites. 
Analisis Kinerja dan Tarif Angkutan Umum Bus Jurusan Surakarta-Yogyakarta: Studi Kasus pada Bus Langsung Jaya, Jaya Putra dan Sri Mulyo Suwardi, Suwardi
Jurnal Semesta Teknika Vol 12, No 1 (2009): MEI 2009
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One of the supporting factors to improve connection between Surakarta and Yogyakarta, is the adequacy of public transportation. With the existence of adequate public transportation that meet the standard, especially Yogyakarta – Surakarta buses, activities in the two cities can be expected to increase. The activities can be economic, politic, social, safety, scientific or the others.  The existing public transportation between Surakarta – Yogyakarta, needs to be evaluated because public might not satisfy the standard. The objective of the research is to analyse the operational cost and tariff of public buses serving Yogyakarta – Surakarta line.  The method of this research is descriptive analysis.  In this research, public work on transportation in this region was analyzed in order to improve its condition in the future. Primary data include the number of passenger, travel time, departure and arrival time.  Secondary data obtained from the bus companies consist of direct and indirect operational costs, as well as fixed and variable cost. The results show that the passenger tariff after yield analysis with headway 4 minutes and the average load factor of 55.83% is IDR 8,720. At headway of  4 minutes and passenger tariff of IDR 8,000 bus companies are still suffering from loss. If the headway changed to 6 minutes , the load factor became  83.75%  and the passenger tariff of IDR 5,800. It is lower than the current passenger tariff of IDR 8,000. The changing of headway from 4 minutes to 6 minutes may increase bus company profit by 27%. 

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