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IPTEK The Journal for Technology and Science

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Published by Institut Teknologi Sepuluh Nopember Surabaya

ISSN : 08534098 EISSN : 20882033 DOI : -

Core Subject : Science,

Computer Science & IT

IPTEK The Journal for Technology and Science (eISSN: 2088-2033; Print ISSN:0853-4098), is an academic journal on the issued related to natural science and technology. The journal initially published four issues every year, i.e. February, May, August, and November. From 2014, IPTEK the Journal for Technology and Science publish three times a year, they are in April, August and December in online version.

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Articles 344 Documents

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The Engineering of Non-Electrical Wheat Cracker Dough Cutting Tool Sulharman, Sulharman; Sirait, Jantri; Saptaningtyas, Wara W.E.
IPTEK The Journal for Technology and Science Vol 29, No 3 (2018)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

The cracker cutter has been developed for many years, but still expensive, less effective, and not suitable Â for wheat cracker cutting. The purposes of this research is to design a tool for suitable cutting, cheap and non-electrical wheat crackers. The design apply using stainless wire and mechanism of the suppressor for cutting. To be able to engineer the tools, it is necessary to prepare materials such as iron elbow, stainless steel, iron plates, bolts, stainless wires, pipes polyvinyl chloride (pvc) and springs. Â The results show that an average cutting time about 12 kg/hour. In economic calculation there is discrepancies capacity per month 2060 kg or IDR. 123,600,000. There is an increase in capacity of 1700%.

A study on Cold-formed Steel Frame Connection: A review Komara, Indra; Wahyuni, Endah; Suprobo, Priyo
IPTEK The Journal for Technology and Science Vol 28, No 3 (2017)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

This paper is aimed to review the current researches on Cold-formed steel (CFS) structures, particularly for screw connections, welded connections, bolted connections and adhesive connections. Connection presents as a major parameter of the important elements for CFS framing system in order to attain its structural stability. The performance of different CFS connections is well-discussed in order to capture the behaviour of each type of connection. Based on the review assessment, the results highlighted that all types of connections except adhesive connections have shown the proper behaviour that can trigger the change of any design codes. Otherwise, adhesive connection is given several advantages that leads a novelty in the construction technology. Hence it still has some gaps of knowledge that are needed to be filled with comprehensive future researches.

Effect of Increasing Sea Water Temperature on Performance of Steam Turbine of Muara Tawar Power Plant Nastopo Darmawan; Triyogi Yuwono
IPTEK The Journal for Technology and Science Vol 30, No 2 (2019)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Muara Tawar Power Plant is located on the coast of Bekasi, West Java, Indonesia. Along with the economic development, there are plans to do reclamation the sea around Muara Tawar Power Plant and build around it as a port and industrial estate. This could potentially lead to an increase in sea water temperatures. This paper aims to determine the effect of increasing sea water temperature on the performance of steam turbine 1.4 in Muara Tawar Power Plant, which uses sea water as a condenser cooling medium. The intended performance is the output power of the steam turbine, the condenser pressure and the system efficiency. Steam turbine 1.4 has 225 MW installed output power, supplied from 3 HRSG (Heat Recovery Steam Generator).Analysis of the effect of sea water temperature rise on steam turbine performance is carried out by using the cycle-tempo software. The main equipment of steam turbine is modeled in cycle-tempo, then model is validated by comparing with design data. Varies sea water temperature then is inputted on model in order to obtain the output power of steam turbine, condenser pressure and system efficiency. The results show that for every 1˚C increase in condenser cooling water temperature extracted from seawater near the plant, the output power of the plant decreased by about 0.171%, the condenser pressure increased by about 5.146%, and the system efficiency decreased by about 0.168%.

Design of Control and Monitoring System to Avoid Inter-Ship Collisions in West Shipping Lane Tanjung Perak Surabaya Sari, Devina P.
IPTEK The Journal for Technology and Science Vol 23, No 4 (2012)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

The occurrence of several ship accidents in narrow waters of Madura strait which is the west shipping lane of Tanjung Perak Surabaya has inspired the research on the design of a control system on the ship to avoid any collision between ships. The existence of automatic control with the autopilot is required to minimize the occurrence of collisions between ships In this final study investigated the application of fuzzy logic to control the yaw angle on the vessel MV Karana Sembilan. Fuzzy logic used is Sugeno Takagi type with the input of the error yaw, yaw rate and distance of the ship with a disturbance. Tests conducted with a control system without disturbance, with disturbance, and the presence of obstacles in front of the ship. Performance of control system is obtained by using the disturbance, the fuzzy appearance is 2:41 hm distance position, the speed of 7.5 knots and 0.5 error, then the resulting yaw angle is 6580. Results control with fuzzy syncronized with monitoring at M&C system in visual basic. The view of the monitoring, 3 types of scenarios obtained. For the first scenario, which is created with the control on it, produces the best results of the avoidance, if compared to the second scenario, with trajectory and control anti-collision cross, and if compared with the third scenario that has no built control system with decision-making on it.

Calculation Method of Green Open Space Based on Carbon Emission from Transportation Sector in Surabaya Ikhlas, Nurani; Abdullah, Taufik; Boedisantoso, Rachmat
IPTEK The Journal for Technology and Science Vol 28, No 2 (2017)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Surabaya is one of the metropolitan cities with dense transportation activities. Transportation is an activity contributes in increasing excessive release of carbon emmisions into the air. The increasing of carbon emmision can causes inventory green open space should be adjusted to reduce air pollution. The purpose of this study is to determine the green open space necessary based on the carbon emissions that is produced in the city of Surabaya. This study was conducted by the method of approach in Surabaya in each area of the transportation sector. The results show that the total green open space is needed in Surabaya is 66.526 km2 with total emission is produced 329,443.66 CO2/month or about 3,953,323.92 CO2/year.

Generating Requirement Dependency Graph Based on Class Dependency Samosir, Hernawati; Siahaan, Daniel
IPTEK The Journal for Technology and Science Vol 29, No 2 (2018)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

A set of software requirements is an important element in software development. Engineers realize that requirements are interrelated. The interconnections between requirements indicate interdependences between requirements. This interdependence is crucial in decision-making processes of requirement engineering, such as a change management requirement, a version launch plan, and a requirement management. Researchers have been focused on visualizing dependency between requirements, analyzing the impact of changes in software by using changes to UML class diagrams, and predicting bug occurrences based on dependencies between requirements. Previous studies assumed that the requirements dependency information was pre-build by requirements engineer during the previous development process. This paper introduces a method that builds a requirements dependency model. The model was built based on realization associations between requirements and classes in the system design as well as dependencies between classes. The modeling process used semantic similarities between the requirements and the classes. A class is said to have a realization association with a requirement if and only if the semantic similarity is higher than a certain threshold. The output obtained from the dependent software development method was compared with the output produced by annotators. The method reliability was measured by the level of agreement between the method and the annotator using kappa statistical index. The preliminary result shows that the method was fair agreement (0.37) reliable as an annotator when generating requirements dependency graph.

Separating Multi Speeches in Intelligent Humanoid Robot using FastICA Heri Ngarianto; Alexander A S Gunawan; Widodo Budiharto
IPTEK The Journal for Technology and Science Vol 29, No 1 (2018)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

The main objective of our research is to develop an intelligent humanoid robot for teaching children by listening and answering the questions. In our previous research, we have designed a humanoid robot that can detect human face and receive commands by using speech recognition. Our robot is based on Bioloid GP robot and Raspberry Pi2 as control system. In this study, we would like to expand the capability of the robot system in order to isolate the speech of one speaker from all the other sounds. The problem for separating multi speeches from stereo audio record is called as Blind Speech Separation (BSS). We propose FastICA algorithm to solve the BSS problem. FastICA is an efficient algorithm to separate several signals based on Independent Component Analysis (ICA) algorithm. Some assumption must be met to use FastICA, that is the number of mixtures are equal to the number of sources and the sources are linearly independent from each other. To evaluate the algorithm, we use several simulations based on two speech sources and its mixing matrix. Our simulation shows FastICA algorithm can solve BSS problem by separating two sound signals, but its linearly independent assumption makes it difficult to implement in our humanoid robot

Design and Implementation of A Patient-Doctor Monitoring System: A Review and A Telemedical Algorithmic Approach for Non-Invasive Post-Malaria-Diagnosis Monitoring Kommey, Benjamin; Akwaboah, Akwasi Darkwah; Owusu-Akyaw, Josephine
IPTEK The Journal for Technology and Science Vol 29, No 2 (2018)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

In an era where there is a globally concerted effort to improve healthcare especially in regions with endemic diseases like Sub-Saharan Africa, there have been major calls for real-time health data acquisition and reporting[1] to prompt health institutions and government to adequately plan and tackle such challenges. Data Acquistion is also very important as it will in the long run drive other future research work. Due to these eminent reasons, this paper seeks to review a number of situational reports, relevant projects and papers with proposed solutions or implemented prototypes that can be employed in monitoring the recovery and health status of patients that are diagnosed of Malaria. This paper also proposes an operational algorithm (based on the existing projectsâ€™ review) of a wearable embedded device in the form a flowchart to inspires device makers and innovators to design systems and devices to help in the fight against Malaria, which currently claims the lives of thousands annually. [2] The focus, though on Malaria because of its prevalence in the Sub-Saharan Africa, can be employed on other similar endemic diseases.

Maritime Weather Prediction using Fuzzy Logic in Ternate Waters North Maluku Sangadji, Anisa; Aisjah, Aulia Siti; Nugroho, Gunawan
IPTEK The Journal for Technology and Science Vol 27, No 2 (2016)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

Ternate waters of North Maluku is one of Indonesian eastern waters whose maritime weather is often unpredictable. Weathers prediction is important to avoid accidents in the waters. The aim of this research is to obtainÂ Â Â Â Â Â Â Â Â Â Â Â Â a predictor model of waveâ€™s height and currentâ€™s speed suitable for the Ternate waters using Takagi-Sugeno fuzzy logic. The data used is data from BMKG Maritime of Bitung which recorded per 6 hours during 5 years from July 2010 â€“ June 2015. In order to reach accuracy of > 85%, 3 model predictorâ€™s that used waves height and current speed are predictor Model A, Model B and Model C. Each model uses different input and total membership function. The result of this research shows that the Model C is the best model for Ternate waters. Model C uses 4 membership functions for 3 input variables. Inputs of waves height predictor consist of the actual wind speed (U(t)), actual waves height (H(t)) and waves height 6 hours ago (H(t-6)) and accuracy percentage of waves height 6 hours ahead (H(t+6)) is 91,99%; while inputs of current speed predictor consist of actual wind speed (U(t)), actual current speed (Cu(t)) and current speed 6 hours ago (Cu(t-6)) and accuracy percentage of current speed 6 hours ahead (Cu(t+6)) is 81,63%.

A Review on Risk Factors in the Project of Oil and Gas Industry Rodhi, Nova Nevila; Anwar, Nadjadji; Artama Wiguna, I Putu
IPTEK The Journal for Technology and Science Vol 28, No 3 (2017)
Publisher : IPTEK, LPPM, Institut Teknologi Sepuluh Nopember

In Each activity in the oil and gas industry there are risks that could hamper the project and also there is a huge risk to the environment, social and economic. Besides oil and gas industry projects also have the potential to be dangerous to life, property and the environment, the hazard can occur if the activity is not controlled and regulated by appropriate. Basically, the disaster is certainly not possible to be planned and can occur at any time. But the circumstances of a disaster can be anticipated, that is the way to plan preventive measures and control.Based on the description above, this paper aims to discuss risk factors and risk assessment techniques that can help sustainable development programs. From the results of this study note that the risk factors of projects in the oil and gas industry is very complex, so a risk analysis must be done from various aspects, namely the project itself, the environment and disaster and should be integrated with aspects of sustainable development. As for the suggested technique is a combination of monte carlo and system dynamics.

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