IPTEK The Journal of Engineering
IPTEK The Journal of Engineering (E-ISSN: 2337-8557) is an academic journal on the issued related to engineering and technology. IPTEK The Journal of Engineering published first time in August 2014. From 2014-2018 (Volume 1-4) IPTEK The Journal of Engineering publish three issues (numbers) annually (April, August, and December). Since 2019 published annually in April and August. It is open to all scientist, researchers, education practitioners, and other scholars. Therefore this journal welcomes various topics in different engineering disciplines. Our target is to reach all universities, research centers and institutes in the globe. Call for Papers IPTEK The Journal of Engineering is an open-access journal, which means that visitors all over the world could read, download, cite, and distribute papers published in this journal for free. We adopt a peer-review model, which insured fast publishing and convenient submission. In addition to peer-reviewed original research papers, the Editorial Board welcomes original research reports, state-of-the-art reviews and communications in the broadly defined field of engineering science and technology. Theses, dissertations, research papers, and reviews are all acceptable for publication. All topics should relevant to the issues faced by industries, governments, and communities. The broad-based topics may be covered by the following knowledge areas: Computer Engineering and Information Systems (Telematics, Algorithms and Programming, Network Based Computing, Smart Computing and Vision, Intelligent Information Management, Computer Architecture and Networking, Applied Modeling and Computing, Graphics Interaction and Games, Software engineering, Information Technology Infrastructure and Security, Information Systems Management, Data Engineering and Business Intelligence, Data Acquisition and Information Dissemination, Enterprise System, and Smart Cities and Cyber Security) Civil Infrastructure Engineering (Hydrotechnics and Surveying, Construction Implementation Management, Building Materials and Structures, and Transportation and Geotechnics) Mechanical Engineering (Energy Convertion, Metallurgical and Materials Engineering, Mechanical Design, and Manufacture) Electrical Engineering Automation (Cyber Physical, Automation, and Industrial Robots, Programmable Logic Controller and Control System, Antennas and Propagation, Instrumentation, Measurement and Power System Identification, Multimedia Telecommunications Network, Multimedia Communication, Electric Energy Conversion, Electric Power System Simulation, High voltage, System and Cybernetics, Microelectronics and Embedded Systems, Biocybernetics, Instrumentation and Biomedical Signal Processing, Multimedia Computing and Machine Intelligence, and Digital Signal Processing) Chemical Engineering (Applied Chemistry, Biochemical and Bioprocess, Advance Functional Materials and Analysis, Thermodynamic, Chemical Reaction, Material and Nanocomposite, Bioenergy, Wastewater Treatment, Process Integration, Fluid Mechanic, and Sustainable Industrial Systems) Instrumentation Engineering (Control Instrumentation, Measurement Instrumentation, Photonic Engineering, Vibration and Acoustics, and Embedded Systems and Physical Cyber) Business Statistics (Business Analytic, and Quality and Productivity Engineering) And physical, chemical, biological, and environmental sciences that are directly related to engineering.
Articles
311 Documents
<![CDATA[Developing Citizen Relationship Management (CiRM) Oriented E-Government Maturity Model ]]>
<![CDATA[Anita Wulansari]]>;
<![CDATA[Apol Pribadi Subriadi]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 3 No. 1 (2017) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/joe.v3i1.2268
<![CDATA[CiRM (Citizen Relationship Management) has an important role in the government because it puts citizen in the best interests. So far the implementation of e-government only focused on the technology assimilation process. Since existing e-government maturity assessment models only measure the ability of e-government technology, they lack in consideration towards citizen needs. Therefore an e-government maturity assessment model is developed by incorporating elements of CiRM. The model was developed through a grounded theory qualitative study approach. The object of this research is e-government application owned by the city of Surabaya. This research developed CiRM oriented e-government maturity model consisted of organization, interaction, service and citizen insight dimensions. This model then was used to assess the maturity of CiRM oriented e-government implementation of Surabaya Single Window (SSW) online service.]]>
<![CDATA[Estimation Risk of High Risk Building Project on Contractor ]]>
<![CDATA[Imayanti Basari]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 3 No. 2 (2017) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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<![CDATA[The increasing need for space and limited land especially in big cities cause many high rise building projects in Indonesia. Construction projects including high rise building projects are located in complex and dynamic environments result in high levels of uncertainty and risk. Risks are always present in construction projects and often lead to delay schedules or cost overruns. Risk management is a process consisting of risk identification, qualitative and quantitative assessment, response with appropriate methods of handling and risk control. The concept of risk management is becoming very popular in a number of businesses. Many companies often create risk management procedures in their projects to improve performance, minimize losses and increase profits Risk event from a different project is different from the risk event on another project. Likewise, the level of occurrence and impact in each project is always changing from one project to another. This makes it difficult for management to handle risks on new projects. Lack of risk management, even inadequate risk analysis, can put construction projects in jeopardy. This research looked for alternatives to get risk event, concequance or impact estimates and likelihood or generic possibilities in order to be used to control the risk of subsequent high rise building projects. This research involves several high rise building projects that will be used as a basis for determining risk events, concequance or impact and likelihood or possibilities. In this study used qualitative methods, and data analysis is done by statistical analysis by finding the average of available data. Estimation this risk can help contractors, especially in the field of high rise building to manage risk both from risk factors, likelihood and consequence.]]>
<![CDATA[The Factor Analysis That Has Significant Influence on The Timing of Implementation of Infrastructure Development LRT (Light Rail Transit) Projects in Jabodebek ]]>
<![CDATA[Faisal Fahmi]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 3 No. 2 (2017) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/joe.v3i2.2797
<![CDATA[Jakarta Bogor Depok Light Rail Transit or abbreviated as LRT Jabodebek is a Mass Transit system with light rail (LRT) which is planned to be built in Jakarta, Indonesia and connecting Jakarta with surrounding cities like Bekasi and Bogor. One of the most important problem in the construction of this Jabodebek LRT is the delay in implementation time. This study aims to determine the factors that have a significant influence on the timing of the implementation on Jabodebek LRT. This research used descriptive method. The instruments that used in data collection is through questionnaire technique (questionnaire). This research will discuss about the application of the TOPSIS method in classifying which factors are the most significant to the time of construction on Jabodebek LRT. The weighting critriea and the classification criteria using Topsis. The results of this study indicate that land handover aspect is the first rank to be considered as the main factor causing project delay with preference value 0.9. The second aspect is the preparation of a good work plan with a preference value of 0.82. The third aspect is the selection of improper construction methods with the preference value of 0.8 and the fourth aspect which is not less important to be considered is the funding aspect of the project activity with the preference value 0.79. The author recommends that the decision makers should consider these aspects so that project implementation time can be well controlled so that there is no delay to know which factor is the most significant with respect to time in the implementation time of the project Jabodebek LRT.]]>
<![CDATA[NPV at Risk Review on Investment Evaluation of Hotel Development in Block M Jakarta ]]>
<![CDATA[Aroka Aryadeta]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 3 No. 2 (2017) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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<![CDATA[Hotel Grandhika Blok M Jakarta built in 2013 and started operation in early 2016. In terms of investment, the function of the building is not necessarily the best. Therefore it is necessary to do further study on the evaluation of hotel development, whether it remains operational as a hotel or there is a better investment alternative on the land of Grandhika Hotel Block M. The results of spreading questionnaires to five property experts consisting of academic and practitioners experts, are obtained the probability for hotel 100% optimists and 0% pesimists, Apartement 60% optimists and 40% pesimists, Offices 40% optimists and 60% pesimists. Then do the calculation Net Present Value (NPV). From NPV analysis obtained value NPV after 8 years for hotel NPV Rp. 7,788,146,628.49 , apartments NPVRp. 17,992,955,784.81 and officeNPV Rp. 6,852,663,146.56. For a maximum productivity analysis of the value of the property at the end of the investment period, so the utilization of land for the hotel will provide productivity of76.90%, for apartements provide productivity of 41.62% and office provide value of productivity of 18.16%. After obtained probability, productivity analysis and Net Present Value then taken decision by using decision tree method. The result is that the hotel as the best investment. From these results the best investment the investor can decide whether to continue operating the hotel or change functions the best alternative of the existing alternatives.]]>
<![CDATA[Analysis Of Head Losses Consequent Section Diameter, Pipe Material and Flow Debit Using Contrast Test (Scheffe’s Method) at 900 Elbow Joint ]]>
<![CDATA[Am. Mufarrih]]>;
<![CDATA[Saut Kasdiardi Silalahi]]>;
<![CDATA[Irwan Setyowidodo]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 3 No. 3 (2017) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/joe.v3i2.3081
<![CDATA[Piping system is needed notice on group of high population people. Water flows come out from people residend sometimes unstable when used. This anomaly can be happened because factor of section diameter, pipe material, and flow debit passed through pipes elbow. This research intend to know effect section diameter, pipe material varians, flow debit of head losses and knowing coefficient losses consequent reynold number. This research is using factorial desain orthogonal array L12 then data analysis used Analysis Of Variance (ANOVA) with assistance minitab 16 software and contrast test (Scheffe’s Method). The results of this experiment head losses highest value of pipe section diameter 1 inch towards ¾ inch, PVC (Poly Vinyl Cholide) pipe material, and flow debit 20 liter/minutes is 42.33 mm. For head loses lowest value of pipe section diameter ¾ inch toward 1 inch, PE (Polyethylene) pipe material, and flow debit 10 liter/minutes is 5.33 mm, although highest coefficient losses of section diameter ¾ inch towards 1 inch, PVC (Poly Vinyl Cholide) pipe material, and flow debit 10 liter/minutes is 1.4602. ANOVA result and contrast test (Scheffe’s Method) concluded section diameter, pipe material, and fluid flow debit significant effect of head losses. Based the conclusion of research, reseacher suggest that small section diameter toward big section diameter, better pipe material and low flow debit if want to reduce head losses value of piping system.]]>
<![CDATA[Variability of Sea Surface Temperature in Indonesia Based on Aqua Modis Satellite Data ]]>
<![CDATA[Nurul Fatimah Yunita]]>;
<![CDATA[Muhammad Zikra]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 3 No. 3 (2017) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/joe.v3i2.3083
<![CDATA[Sea surface temperature (SST) is one of the oceanographic factor in seawater. Its value depends on several factors. In indonesia, SST value depend on season and location. The aims of this study are to analyze the spatial and temporal variability of SST using 10-years (2007-2016) Aqua Modis satellite data. The result shows that the average of SST in Indonesia ranges from 27 – 31 °C depending on location. SST in equator area range from 30 – 31 °C and in nonequator area range from 27 – 30 °C. Monthly and seasonal variation of SST also show different value for each area in the indonesian region.]]>
<![CDATA[Influence of the Compression Ratio and Duration Injection on Performance and Emission of Sinjai Engine Type Flexible Fuel Engine 150 cc Fueled Bioethanol E70 ]]>
<![CDATA[Hanapi Hasan]]>;
<![CDATA[Bambang Sudarmanta]]>;
<![CDATA[Marthen Paloboran]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 3 No. 3 (2017) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/joe.v3i3.3167
<![CDATA[In this study, the effects of using gasoline (E0) and gasoline-ethanol blends E70 on engine performance and exhaust emissions have been experimentally investigated. The investigation was conducted on a single-cylinder, four-stroke, spark ignition engine. The experiments were performed by varying the compression ratio and duration injection (100%, 125%, 150%, 175% and 200%) at a speed of 2000 up to 8000 rpm at full open throttle. The experimental results showed that blending gasoline with ethanol slightly increased the torque and decreased carbon monoxide (CO) and hydrocarbon (HC) emissions. It was also found that blending with ethanol allows increasing the compression ratio without knock occurrence.]]>
<![CDATA[Influence Of The Compression Ratio And Ignition Timing On CB150R Engine Performance With 85% Bioethanol gasoline Blended Fuel ]]>
<![CDATA[Yuli Mafendro Dedet Eka Saputra]]>;
<![CDATA[Bambang Sudarmanta]]>;
<![CDATA[Marthen Paloboran]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 3 No. 3 (2017) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/joe.v3i3.3207
<![CDATA[Subtitution of the fuel type in the gasoline engine will change the setting The engine parameters as well as modify it to minimize engine performance degradation And increased exhaust emissions. Utilization of ethanol (85% vol.) - gasoline (15% vol.) The combination (E-85) for the gasoline engine requires some machine modifications and setting parameters due to differences in properties and characters between ethanol and gasoline. This study aims to test the effect of ignition timing and compression ratio on the performance of the engine and emission gas emissions. Ignition time varies between 16-24 Before Top Dead Center (BTDC) d. While the compression ratio variation consists of 11 (standart); 12, 12.5 and 13: 1. It was found that advancing the ignition time range 16o-24o BDTC with 13: 1 compression ratio can increase the performance of torque, bmep, and thermal efficiency respectively 7.94%, 5, 82% and 1.6% respectively, and a decrease of emissions of co and hc respectively 56.6% and 0.6% when compared with the performance of standard gasoline-fueled engines (E0).]]>
<![CDATA[In the face of gentrification : a case study of social capital in supporting community efforts to form a collective action ]]>
<![CDATA[Azka Nur Medha]]>;
<![CDATA[Putu Gde Ariastita]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 3 No. 3 (2017) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/joe.v3i3.3208
<![CDATA[Gentrification is believed to be an urban phenomenon that has a negative impact on neighborhood society. Therefore, the neighborhood community becomes an important study object in order to understand the process of gentrification itself. This study observes the community in Medokan Semampir community group, Surabaya, that raised a case study in which they made collective action to face gentrification. Collective action can be viewed as a solution in order to facilitate the common interests of a gentrified community. The aim of this paper is to explain the collective action process in the context of social capital, and how communities can keep the capital as collective assets to prevent gentrification processes anguish its members.]]>
<![CDATA[Study of Shipboard Power Distribution System: Review on an Aplication of AC Zonal Distribution ]]>
<![CDATA[Danang Cahyagi]]>;
<![CDATA[Eddy S. Koenhardono]]>
<![CDATA[ IPTEK The Journal of Engineering Vol. 4 No. 1 (2018) ]]>
Publisher : <![CDATA[Institut Teknologi Sepuluh Nopember ]]>
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DOI: 10.12962/joe.v4i1.3734
<![CDATA[The shipboard power distribution system has been developed in order to make it more efficient. AC zonal distribution system is one of the options in order to achieve the objection. This study aims to observe the shipboard application with AC zonal distribution system. The distribution system is modeled, simulated, analyzed, and compared with conventional system. Based on simulation, the AC zonal distribution system provide higher reliability, better power continuity, and more stable power generation. Therefore, development of the zonal distribution system continues to bring succeed in every mission. However, the system has several challenges for future work such as more complex transmission system, higher voltage drops, and the tendency to have instability power distribution when one generator fails.]]>
