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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 20 Documents
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Search results for , issue "Vol 18, No 2 (2015): NOVEMBER 2015" : 20 Documents clear
Perencanaan Strategis Sistem Informasi/ Teknologi Informasi pada Pusat Koperasi Industri Susu (PKIS) XYZ Susanto, Chayadi Oktomy Noto; Wurijanto, Tutut; Soebijono, Tony
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
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Corporate awareness of the importance of technology’s support in supporting efficiently and effectively business activities is increase. It is also being pursued by PKIS XYZ to manage their business activities. PKIS XYZ experiencing problems which only able to manage 33,33% of their raw materials, while the rest should be managed by another company which incidentally is their competitor. This is certainly not profitable for the company. This research will analyse business processes in PKIS XYZ which are not optimal implemented. The findings obtained will be used as a material planning what technology to be applied in an attempt to optimize the business activities of the company. The output of this research is recommendation of future application portfolio that important to be applied in PKIS XYZ. Framework used in this study was Ward and Peppard, with SWOT and  Mc Farlands Strategic as a tool.
Pengaruh Penambahan Dinding Geser (Shear Wall) pada Waktu Getar Alami Fundamental Struktur Gedung Astuti, Pinta
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
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The structure of high-rise buildings should have sufficient stiffness so that no damage could harm users when earthquake occurred. The addition of shear wall structure is one way to increase stiffness of the building. This research is analyzing the capacity of structural elements and the influence of shear walls in high rise buildings, taking a case study at Mataram City Apartments and Condominium, Yogyakarta. The building consists of two towers. Analytical calculations in this research based on technical data field, quality of materials, and the results of structural analysis with SAP2000. After that, this research will calculate strength of the structure. The analysis based on SNI 03-2847-2002, SNI 03-1726-2002, and the Uniform Building Code (UBC) 1997 Chapter 16 on Requirements Design Structure. Three modification of the shear wall layouts in this research are use to understanding about the effect of adding shear walls to the natural vibration time.   Based on the analysis and calculation, the structure has adequate capacity to support the load with the natural vibration period of 1.831 seconds. Maximum allowable vibration time by SNI 03-1726-2002 is 3.24 seconds, while the Uniform Building Code (UBC) is 1.698 seconds. First model can decrease the natural vibration period of 1.53 % to 1.80 seconds with a drift reduction of 11.35 % in the x axis and 35.27 % in y axis. The second model can decrease the natural vibration period by 5.08 % to be 1.73 seconds with drift reduction is 20.73 % the x axis, 39.31 % and y axis. The merged models have the natural vibration structure of 1.66 seconds
Prototipe Kotak Pengingat Minum Obat Irjayanto, Sulis; Chamim, Anna Nur Nazillah
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
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Patient adherence to long-term therapy of chronic diseases in developing countries less than 50%, including in Indonesia. Patient compliance is required to achieve therapeutic success, especially in the treatment of non-infectious diseases. Such as diabetes, hypertension, asthma, cancer, mental disorders, infectious diseases HIV / AIDS, and tuberculosis. One factor led patience to the non-compliance is their busyness, so they often forget to take medication. Prototype of medication reminder box is one of the solutions to remind patients to take medication on time. In previous researches, the medication reminder operated in android platform. But, gadgets equiped with android operating system are often in out of reach of many people in developing countries. So, in this study, the medication reminder box was built with alarm facility that can be regulated by the patient. This device is also used as a portable drugs storage, so that the patient can carry easily. This prototype of medication reminder box operates well as expected and supported with battery which its endurance is 24,7 hours.
Pengaruh Penggunaan Plastik Polyethylene (Pe) Dan High Density Polyethylene (Hdpe) Pada Campuran Lataston-Wc Terhadap Karakteristik Marshall Rahmawati, Anita
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
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The increase in road traffic during the last two decades in combination with an insufficient degree of maintenance due to shortage in funds has caused an accelerated and continuous deterioration of the road network. To alleviate this process, several types of measures may be effective, e.g., securing funds for maintenance, improved roadway design, use of better quality of materials and the use of more effective construction methods. Aspalt can also be modified by adding different types of additive. One of these additives is the polymers such as Polyethylene (PE) and  High Density Polyethylene (HDPE).  The addition of polymers typically increases the stiffness of the aspalt  and improves its temperaturesusceptibility. Increased stiffness improves the rutting resistance of the mixture in hot climates and allows the use of relatively softer base aspalt, which in turn,provides better low temperature performance. This study was conducted to determine the effect of utilizing Polyethylene (PE) and High Density Polyethylene (HDPE) as a mixture of thin layer of asphalt concrete in wearing course (Lataston_WC) using Marshall design parameters. The parameters assessed are the stability, flow,  the percentage of air void in the mixture (VIM), the percentage of void in the mineral aggregate (VMA), the percentage of void filled with aspalt (VFA), and Marshall Quotient (MQ). Marshall samplers prepared with the PE and HDPE modified aspalt binder provide the specification limits. The percentage of  PE and HDPE as asphalt mixture is 0%, 2%, 4% and 6% by weight of the asphalt. The result of Marshall test showed that the value of stability, flow and VFA have tendencey to increase with incresing of percentage of PE and HDPE. But, the value of VIM, VMA and MQ have tendency to decrease with  incresing of percentage of PE and HDPE. It can be seen that effect of addition HDPE on aspalt mixture provide the value of Marshall characteriscs are better than aspalt mixture with PE
Studi Perbandingan Pembebanan Gempa Statik Ekuivalen dan Dinamik Time History pada Gedung Bertingkat di Yogyakarta Faizah, Restu
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
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Time history dynamic analysis is the most accurate method in seismic load calculation, but it is quite complicated and time consuming. For practical need in the field, it used the equivalent static analysis that is the simplified dynamic analysis. The main difference between the static and dynamic concept is on the building characteristic that is calculated in analysis. Dynamic concept calculates the mass, stiffness and damping, while in static concept, only calculates the mass. It is stated in SNI 1726-2012 that equivalent static analysis can only be performed for horizontally and vertically regular structure. Irregular building design, asymmetrical floor plan, and high-rise building can use dynamic analysis. This research compared the result of equivalent static seismic load and time history dynamic analysis on the reinforced concrete frame structure of 5 levels, 10 levels, 15 levels, 20 levels, 25 levels, and 30 levels. Time history dynamic analysis is done with the assistance of Matlab program and used of accelerogram of 2006 Yogyakarta earthquake as the seismic input. The result of this study shows that the calculation result of the equivalent static seismic load is quite accurate on the 5 levels building, because it gives larger requirement in designing the structure, compared to the time history dynamic analysis of the seismic load. While on the calculation of equivalent static seismic load on the 10 or more levels structure is considered as not accurate, because it gives smaller requirements in designing the structure, compared to the time history dynamic analysis of the seismic load.
Analisis Kinerja Biaya Dan Jadwal Terpadu Dengan Konsep Earned Value Method (Studi Kasus: Proyek Pembangunan Gedung ) Priyo, Mandiyo; Indraga, Khairul Fajri
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
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Project control necessary to track and anticipate the possibility of bad will happen in the project and take appropriate action. In project control, there are two variables that affect the success of the project that is time and cost. Control of the project carried out properly and systematically necessary to determine the performance time and cost of the project. The purpose of this study was to determine the performance of the project in terms of time and cost of completion of the project. In addition, this study aims to estimate the time and cost of completion of projects on time and to know the index is reviewed project achievements. The data used are secondary data from contractors. These data include the Budget Plan, Budget Plan of Implementation, progress reports, and time schedule. The method used to analyze the value method result (Earned Value Method) which combine aspects of the schedule, cost and time to complete the project.The analysis was performed with the help of software Microsoft Excel 2013. The results showed that the CPI and SPI values at week 28 was negative SV value (Rp. -78,827,148.63) And SPI values is 0.99 <1, which means there is a delay the schedule of implementation of the plan schedule. While the value of positive CV (Rp. 2,108,709,167.60) and the CPI amounted to 1.30> 1, which means more less than final cost of the budget. The estimated cost of the project required Completion is EAC (Rp. 8,400,517,603.93) and ETC (Rp. 1,253,357,227.10). While estimates of the required project completion time is 38 weeks. Value confidence index performance (TCPI> 1) or value of 1.30 means there is a decrease in performance.
Peningkatan Ketahanan Korosi Pada Material Biomedik Plat Penyambung Tulang SS 304 Dengan Gabungan Metode Shot peening dan Electroplating Ni-Cr Sunardi, Sunardi; Iswanto, Priyo Tri; Mudjijana, Mudjijana
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
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Stainless steel (SS) 304 is widely used as biomedical materials because of its lower cost and its availability. However its corrosion resistance is lower than that of the SS 316L. The purpose of this study is to determine the influence of the combination surface treatment i.e. shot peening treatment and electroplating Ni-Cr on the corrosion resistance in simulated body fluid (SBF) of SS 304 material. The shot peening treatments were carried out using a variable period of 5, 15 and 30 minutes. Diameter steel balls of 0.6 mm with a hardness of 40-50 HRc, was applied. Pressure compressor was maintained in the range of 6 -7 kg / cm2 with nozzle diameter and the distance between nozzle and the specimen of 5 mm and 10 cm respectively. After shot peening process, the specimens were nickel-electroplated using a voltage of 2 V at current of 0.03 A with the distance between the electrode of 4 cm for 15 minutes. After nickel-electroplated process the specimens were chrome-electroplated using a voltage of 4.5 V at current 0.3 A with the distance between the electrode of 15 cm for 5 minutes. The specimen was then tested its corrosion rate in the test medium SBF using Galvanostat M 273 in the range of -20 mV s / d 20 mV. The corrosion test results show that SS 316L and SS 304 without treatment have corrosion rate respectively 1.212 X 10-3 mm / year and 4,003 x 10-3 mm / year. Which means that corrosion rate of SS 304 is 333% higher than SS 316L. The corrosion rate after treatment shot peening 5, 15 and 30 minutes followed by Ni-Cr electroplating is respectively 2.121 x 10-3 mm / year, 0.554 x 10-3 mm / year and 0 mm / year (not detected by the measurement instrument).
Efektivitas Zona Selamat Sekolah (ZoSS) di Sekolah Dasar(Studi Kasus di Kabupaten Banyumas, Provinsi Jawa Tengah) Indriyati, Eva Wahyu; Santi, Mina Yumei; Tanjung, Mega Zahara; Sugiyanto, Gito
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
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Many elementary schools in a city or district in Indonesia located on the edge of the highway (arterial road or collector road), with many vehicles are driving at high speed. In these circumstances it is very dangerous for school children as a pedestrian or vulnerable road user. In response, the government implemented a program like School Safety Zone (Zona Selamat Sekolah ” ZoSS”) to anticipate the movement of school children who are spontaneous and unpredictable. School Safety Zone, as an instrument to reduce traffic speed in a school area, has been implemented in Indonesia from 2006. The aim of this study tried to evaluate the effectiveness of the School Safety Zone in elementary school based on the behaviour of its users, including students, parents, and travelers around the school. The approach taken with analyzes the effectiveness of ZoSS, by the research at three public elementary school in Banyumas District. The analysis was done by observing pedestrian behavior, the behavior of the parent then analyzed with reference to the guidelines issued by ZoSS General Directorate of Land Transportation Decree No. 3236/AJ 403/DRJD/2006. Based on the analysis, the behavior of pedestrians and parent were unsaved with percentage average of unsaved pedestrian behavior is 84.92% and unsaved parent behavior is 74.52%. Percentage of the average pedestrian crossing procedure 4-T is 33.16%, crossing road by walking 87.87%, facility using the zebra cross 58.90%. Direction of arrival of the vehicle in front of the school 80.26%, stopping in the spot 63.33% and putting up/down child of the vehicle on the curb side of 72.97% . It’s still not effective as many pedestrians and parent don’t have good traffic behavior.
Perbandingan Analisis Two Way Slab With Beam dengan Flat Slab (Studi Kasus: Coal Yard PLTU Kalimantan Barat) Syamsi, Muhammad Ibnu
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
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Floor slab of coal yard as a storehouse was designed as two way slab with beam and flat slab in order to compare those two systems based on needs of materials and ease of implementation. The design process is based on the provision of SNI 03-2847-2002. Through the design results and analysis of material requirements can be concluded that the need for concrete material on a flat slab system is 2.1% greater than on the two way slab with beam. Meanwhile the steel material requirements for flat slab system is 9.7% greater than two way slab with beam. However, in term of ease of implementation, relatively flat plate systems are superior to the briquette plate system because the number of items of work a little more
Gaya Lateral In-Plane Struktur Portal Dinding Pasangan Bata ½ Batu Melalui Analisis Numerik Prayuda, Hakas
Semesta Teknika Vol 18, No 2 (2015): NOVEMBER 2015
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Building construction in Indonesia is categorized as two big classes; there are engineered building and non-engineered building. Non-engineered building is very susceptible to the lateral load such as an earthquake, either medium earthquake or massive earthquake that causing sudden collapse so that the research of mitigation building strength needs to be done which is rely on the strength of brick masonry (non-engineered building) that can be predicted through measuring micro vibration at the bottom and the top of the brick masonry wall surface. The aims of this research is to find out the effect of ½ stone brick masonry in its contribution to the rigidity of simple portal structure by using loading in-plane lateral system. Loading analysis result at the plastic limit is 95, 524 kN or only 86,89% of the maximum load, meanwhile lateral deviation at the plastic limit is 7,506 cm or 27,51% of maximum lateral deviation. Besides, The rigidity of ½ stone brick masonry wall is 12,72 kN/cm.

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