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Publisher: Universitas Ahmad Dahlan   (Total: 16 journals)   [Sort by number of followers]

Showing 1 - 16 of 16 Journals sorted alphabetically
Ahmad Dahlan J. of English Studies     Open Access   (Followers: 2)
Bahastra     Open Access  
Berkala Fisika Indonesia     Open Access  
Bulletin of Electrical Engineering and Informatics     Open Access   (Followers: 8)
HUMANITAS (Jurnal Psikologi Indonesia)     Open Access   (Followers: 4)
Intl. J. of Advances in Intelligent Informatics     Open Access   (Followers: 7)
J. of Education and Learning     Open Access   (Followers: 11)
Jurnal Hukum Novelty     Open Access  
Jurnal Ilmiah AdMathEdu     Open Access  
Jurnal Informatika     Open Access   (Followers: 1)
Kes Mas : Jurnal Fakultas Kesehatan Masyarakat     Open Access   (Followers: 2)
Media Farmasi     Open Access  
Pharmaciana     Open Access  
Psikopedagogia : Jurnal Bimbingan dan Konseling     Open Access   (Followers: 2)
Spektrum Industri : Jurnal Ilmiah Pengetahuan dan Penerapan Teknik Industri     Open Access  
TELKOMNIKA (Telecommunication, Computing, Electronics and Control)     Open Access   (Followers: 8, SJR: 0.265, CiteScore: 1)
Journal Cover
TELKOMNIKA (Telecommunication, Computing, Electronics and Control)
Journal Prestige (SJR): 0.265
Citation Impact (citeScore): 1
Number of Followers: 8  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1693-6930 - ISSN (Online) 2302-9293
Published by Universitas Ahmad Dahlan Homepage  [16 journals]
  • Techno-Economic Analysis of Solar-Powered Lighting for above Seawater
           Toll-Road in Bali

    • Authors: N.M. Karmiathi, I.N.S. Kumara, W.G. Ariastina, I.W. Gunarta
      Abstract: The objective of this study was to obtain engineering and economical analysis of Solar-Powered Lighting (SPL) designed to be installed at Bali Mandara above Seawater Toll-Road. Bali Mandara toll-road is developed to provide quick link of the triangle traffic congestion in Bali. The triangle points are City of Denpasar, international Ngurah Rai air port, and Nusa Dua as the center of Bali tourism area. The SPL was designed to operate 12-hours per day with an average illumination of greater than 15-lux. Based on conducted technical analysis, the requirements can be met by utilizing two pieces of 87 W LED lamps mounted on 10-meter tall double-arms pole with 2.366-meter arm length and with 15º tilt angle. Each lamp was supplied by 260 Wp solar module, 24 V 180 AH battery and 10 A solar charger controller. The SPL unit to be installed on the road median with 22.5-meter pole spacing and hence requires a total of 361 units. The benefits of solar-powered lighting were non-renewable electrical energy saving of 256.15 MWh per year and carbon emission reduction 217.98 Tonnes CO2 equivalent per year. However, the SPL energy cost was 3.9 times higher than curent street lighting electricity tariff which generated using conventional resources. And according to investment feasibility using Net Present Value and Profitability Index techniques show that the SPL implementation was not feasible.
      PubDate: 2018-10-01
      DOI: 10.12928/telkomnika.v16i5.7056
      Issue No: Vol. 16, No. 5 (2018)
  • Economic Load Dispatch with Valve-Point Effect Using Bacterial Foraging

    • Authors: Muhammad Ridha Fauzi, Rahmad Al Rian
      Abstract: Fuel is the most cost component of thermal power generation. The output power of each plant should not exceed the needs of the consumer's load. Unoptimal generation between generating units can cause power losses along the transmission line so that the fuel drain is large enough. The purpose of this study was to determine the optimal power output combination of each generating unit and determine the minimum total fuel cost of the combined power output of the plant by taking into account the valve-point effect and the operational constraint (economic load dispatch). The Newton-Raphson method is used to calculate the transmission line power losses. In this research, Bacterial Foraging Algorithm (BFA) optimization method is proposed to solve the problem of economic load dispatch. This method uses natural selection of optimum global bacterium which has a good food search strategy in the fitness function. The effectiveness of BFAs is tested on IEEE 5 bus 3 generator system and IEEE 30 bus 6 generator system. The results of this proposed method show the optimal value of both generating systems.
      PubDate: 2018-10-01
      DOI: 10.12928/telkomnika.v16i5.7717
      Issue No: Vol. 16, No. 5 (2018)
  • Simulation of single phase 3-level z-source NPC inverter with PV system

    • Authors: R. Palanisamy, K. Selvakumar, D. Selvabharathi, Udayan Nayak, Sahil Walia, Pratik Chawda
      Abstract: this paper elucidates simulation of single phase 3-level z-source neutral point clamped (NPC) inverter with PV system. single phase NPC inverter employed due to its advantages like less voltage stress, reduced harmonic content, minimsed CMV and voltage stress is low. Z-source network is engaged to boost input voltage getting from the photovoltaic system, which is manoeuvre in shoot through and non-shoot through conditions. This proposed scheme utilized to enhance the output voltage, minimise THD and the leakage current can be avoided with help of split inductor connected with output of inverter system. sinusiodal pulse width modulation (SPWM) used as control technique for the proposed 3-level z-source NPC inverter. The simulation results of this scheme has been verified using matlab/simulink
      PubDate: 2018-10-01
      DOI: 10.12928/telkomnika.v16i5.7098
      Issue No: Vol. 16, No. 5 (2018)
  • A Novel Low Cost Fractal Antenna Structure for ISM and WiMAX Applications

    • Authors: Driss ELNABAOUI
      Abstract: Different fractal structures have been widely used in many antennas designs for various applications. A fractal antenna is used for miniaturization and multiband operation. This paper presents a design of a dual-band fractal antenna fed by coplanar waveguide (CPW) transmission line. The proposed antenna is designed and fabricated on an FR4 substrate with a volume of 70 x 60 x 1.6mm3, resonates at 2.42 - 2.62GHz and 3.40 – 3.65GHz with a return loss less than -10dB. The design and simulation process is carried out by using CST-MW studio electromagnetic solver. Simulation results show that the resulting antenna exhibits an interesting dual frequency resonant behavior making it suitable for dual band communication systems including the ISM and WiMAX applications. Concerning the fabrication and measurement of the final prototype of this antenna, a good agreement is found between simulation and measurement results for both frequency bands.
      PubDate: 2018-10-01
      DOI: 10.12928/telkomnika.v16i5.8527
      Issue No: Vol. 16, No. 5 (2018)
  • A New Design of An UWB Circular Fractal Printed Antenna

    • Authors: EL HAMDOUNI Akram, TAJMOUATI Abdelali, ZBITOU Jamal
      Abstract: A Microstrip Antenna (MSA) has been computed and analysed in this study by using CST of Microwave studio as Electromagnetic solver by generating the coefficient of reflection, the Gain, the density of current and the radiation pattern  in the frequency range 3.1 - 10.6 GHz which commercialised by the Federal communication commission (FCC) as an Ultra-wide band (UWB) frequency range. The substrate used to achieve the proposed structure is the FR4-Epoxy with a thickness of 1.6 mm, a constant dielectric of 4.4 and a loss tangent of 0.025. The radiating patch is a circular shape etched with different sizes to create the fractal geometry. The transmission line has been designed by including a tapered section in the part connected to the radiator.  The design of the antenna has been verified by using ADS and CST solvers. The fabrication of the antenna has been performed in order to measure the coefficient of reflection and the radiation pattern.
      PubDate: 2018-10-01
      DOI: 10.12928/telkomnika.v16i5.9548
      Issue No: Vol. 16, No. 5 (2018)
  • Improvement of Pitch Motion Control of an Aircraft Systems

    • Authors: Aishah Johari, Fitri Yakub, Hatta Ariff, Zainudin A. Rasid, Shamsul Sarip, Rudzidatul Akmam Dziyauddin, Mohd Zamzuri Ab Rashid, Azizul Azizan, Yasuchika Mori
      Abstract: The movement of the aircraft pitch is very important to ensure the passengers and crews are in intrinsically safe and the aircraft achieves its maximum stability. The objective of this study is to provide a solution to the control system that features particularly on the pitch angle motion of aircraft system in order to have a comfort boarding. Three controllers were developed in these projects which were proportional integral derivative (PID), fuzzy logic controller (FLC), and linear quadratic regulator (LQR) controllers. These controllers will help improving the pitch angle and achieving the target reference. By improving the pitch motion angle, the flight will be stabilized and in steady cruise (no jerking effect), hence provides all the passengers with the comfort zone. Simulation results have been done and analyzed using Matlab software. The simulation results demonstrated LQR and FLC were better than PID in the pitch motion system due to the small error performance. In addition, with strong external disturbances, a single controller is unable to control the system, thus, the combination of PID and LQR managed to stabilize the aircraft.
      PubDate: 2018-10-01
      DOI: 10.12928/telkomnika.v16i5.7434
      Issue No: Vol. 16, No. 5 (2018)
  • Control System Based On Fuzzy Logic In Nutmeg Oil Distillation Process

    • Authors: Syamsul Syamsul, Rudi Syahputra, Suherman Suherman, Zamzami Zamzami
      Abstract: The focus of this research is the application of electronic control on the distillation boiler of nutmeg oil. The control system is based on fuzzy logic and as the input parameter is temperature and vapor pressure. The temperature parameters are set in the range 80-120 ºC, and the vapor pressure parameters are set in the range of 1-2.5 atmospheres. The output parameter is the time required in the distillation process. The optimal values of these input and output parameters are embedded in microcontroller based control. The control responds to the temperature and vapor pressure to select the gas flow rate at the distillation boiler. This experiment was conducted on a distillation system with a capacity of 25 kg of crushed dried nutmeg, manually and with control based on fuzzy logic. Conventional testing requires 6.90 kg of gas and applying fuzzy logic based control requires 5.50 kg of gas. The yield of nutmeg oil from the distillation process is 2.5 kg conventionally and 2.63 kg with fuzzy logic control. Based on the optimal time of 16 hours distillation process, there was a decrease of gas consumption by 20.3%.
      PubDate: 2018-10-01
      DOI: 10.12928/telkomnika.v16i4.8350
      Issue No: Vol. 16, No. 5 (2018)
  • Combination of Flex Sensor and Electromyography for Hybrid Control Robot

    • Authors: Muhammad Ilhamdi Rusydi, Muhammad Ismail Opera, Andrivo Rusydi, Minoru Sasaki
      Abstract: The alternative control methods of robot are very important to solved problems for people with special needs. In this research, a robot arm from the elbow to hand is designed based on human right arm. This robot robot is controlled by human left arm. The positions of flex sensors are studied to recognize the flexion-extension elbow, supination-pronation forearm, flexion-extension wrist and radial-ulnar wrist.The hand of robot has two function grasping and realeasing object. This robot has four joints and six flex sensors are attached to human left arm. Electromyography signals from face muscle contraction are used to classify grasping and releasing hand. The results show that the flex sensor accuracy is 3.54° with standard error is approximately 0.040 V. Seven operators completely tasks to take and release objects at three different locations: perpendicular to the robot, left-front and right-front of the robot. The average times to finish each task are 15.7 ssecond, 17.6 second and 17.1 second. This robot control system works in a real time function. This control method can substitute the right hand function to do taking and releasing object tasks.
      PubDate: 2018-10-01
      DOI: 10.12928/telkomnika.v16i5.7028
      Issue No: Vol. 16, No. 5 (2018)
  • Detection Hand Motion on Virtual Reality Mathematics Game with
           Accelerometer and Flex Sensors

    • Authors: Erdhi Widyarto Nugroho, Tecla Brenda Chandrawati
      Abstract: Montessori method is a learning method using props. One of the developments props is to use the game as a medium of learning. The examples Game media as learning is the use of Virtual Reality or VR Technology. By using the VR, players will be brought into the virtual world as if the player is in the real world. The weakness of the VR game is the limited interaction with the outside world. Interaction uses only buttons and joysticks. In this paper we use Flex sensor and accelerometer sensor to detect hand movements for VR mathematic game. The result is VR games are more interactive and interesting with hand motion.
      PubDate: 2018-10-01
      DOI: 10.12928/telkomnika.v16i5.7594
      Issue No: Vol. 16, No. 5 (2018)
  • Vibration-Based Damaged Road Classification Using Artificial Neural

    • Authors: Yudy Purnama, Fergyanto E Gunawan
      Abstract: It is necessary to develop an automated method to detect damaged road because manually monitoring the road condition is not practical. Many previous studies had demonstrated that the vibration-based technique has potential to detect damages on roads. This research explores the potential use of Artificial Neural Network (ANN) for detecting road anomalies based on vehicle accelerometer data. The vehicle is equipped with a smart-phone that has a 3D accelerometer and geo-location sensors. Then, the vehicle is used to scan road network having several road anomalies, such as, potholes, speedbump, and expansion joints. An ANN model consisting of three layers is developed to classify the road anomalies. The first layer is the input layer containing six neurons. The numbers of neurons in the hidden layer is varied between one and ten neurons, and its optimal number is sought numerically. The prediction accuracy of 84.9% is obtained by using three neurons in conjunction with the maximum acceleration data in x, y, and z-axis. The accuracy increases slightly to 86.5%, 85.2%, and 85.9% when the dominant frequencies in x, y, and z-axis, respectively, are taken into account beside the previous data.
      PubDate: 2018-10-01
      DOI: 10.12928/telkomnika.v16i3.7574
      Issue No: Vol. 16, No. 5 (2018)
  • Inflammatory Cell Extraction in Pap smear Images: A Combination of
           Distance Criterion and Image Transformation Approach

    • Authors: Rahadian Kurniawan, Arrie Kurniawardhani, Izzati Muhimmah
      Abstract: In order to obtain a diagnosis of cervical cancer information, the characteristics of each cell nucleus must be identified and evaluated properly through a Pap smear test. The presence of inflammatory cells in Pap smear images can complicate the process of identification of cell nuclei in the early detection of cervical cancer. Inflammatory cells need to be eliminated to assist pathologists in reading Pap smear slides. In this work, we developed a novel method to extract the inflammatory cells that allow detection of cell nuclei more accuracy. The proposed algorithm consists of two stages: extraction of inflammatory cells using the distance criterion and image transformation. This experiment applied to the 1358 cells comprising 378 nuclei cells and 980 inflammatory cells from 25 Pap smear images. The results showed that our method can significantly reduce the amount of inflammation that can disrupt the cell nuclei in the detection process. The proposed method has promising results with a sensitivity level of 97% and a specificity of 84.38%.
      PubDate: 2018-10-01
      DOI: 10.12928/telkomnika.v16i2.6817
      Issue No: Vol. 16, No. 5 (2018)
  • Effort Estimation Development Model for Web-Based Mobile Application Using
           Fuzzy Logic

    • Authors: Stefani Agusta, Suharjito Suharjito, Abba Suganda Girsang
      Abstract: Effort estimation becomes a crucial part in software development process because false effort estimation result can lead to delayed project and affect the successful of a project. This research proposes a model of effort estimation for web-based mobile application developed using object oriented approach. In the proposed model, functional size measurement of object oriented based web application named OOmFPWeb, web metric and mobile characteristic for web-based mobile application size measurement are combnined. The estimation process is done by using mamdani fuzzy logic method. To evaluate the proposed model, the comparison between OOmFPWeb as the variable that affect effort estimation for web-based mobile application and the proposed model are performed. The evaluation result shows that effort estimation for web-based mobile application with the proposed model is better than just using OOmFPWeb.
      PubDate: 2018-10-01
      DOI: 10.12928/telkomnika.v16i0.6561
      Issue No: Vol. 16, No. 5 (2018)
  • Realization of MPLS-Based VPN Network for Improved Qos Metrics

    • Authors: Kennedy Okokpujie, Olamilekan Shobayo, Etinosa Noma-Osaghae, Okokpujie Imhade, Obinna Okoyeigbo
      Abstract: Multiprotocol Label Switching (MPLS) is an emerging technology which ensures the reliable delivery of Internet Services with high transmission and lower delays. It is mainly used for its effective management of networks for the efficient utilization of networks due to the many disadvantages that are associated with traditional networking such as cost, inadequate security, delay etc. In this work, the comparison of effectiveness of the MPLS-VPN network in a classic VPN architecture and a basic MPLS network using simulations done on the OPNET modeler 14.5 from Riverbed Technologies. The comparison is made based on performance metrics such as end to end delay, voice packet delay, VPN delay, point to point queuing delay, voice packet sent and received, amount of traffic in Label Switched Paths (LSPs). The result obtained from the empirical study shown that MPLS-based VPN network has lower background traffic flow delay, LSP delay and has better performance in VPN load and VPN throughput. 
      PubDate: 2018-10-01
      DOI: 10.12928/telkomnika.v16i5.7326
      Issue No: Vol. 16, No. 5 (2018)
  • Design of Flood Warning System Based IoT and Water Characteristics

    • Authors: Herman Yuliandoko, Subono Subono, Vivien Arief Wardhani, Sholeh Pramono, Ponco Suwindarto
      Abstract: Indonesia is one of the tropical country with high rainfall. It causes a flood disaster that with the loss of property and life. Currently handling flood disasters in developing countries are still using many conventional ways. By using conventional way the flood early warning system is still not able to reach the wider community so that information too late of impending disaster received by the public. Besides that the speed of information is needed in the handling of disasters. Therefore a rapid flood warning system that can reach a wide area such as the internet is necessary to minimize the effects of disasters. IoT (Internet of Thing) is smart technology which has capability to send data in real time, connected to the smart phone, sensor and web service. This ability can be used for smart application to control and manage an early warning system. In this research we also use IoT technology to monitor and control the early detection system of flood disaster. By using IoT technology, sensor data can be sent in real time from sensor to smartphone through internet network. The sensor data contains the water characteristics data on the dam that will be processed in the data base. The processing data of water characteristic will be a decision of hazard level. That decision will be sent to users as notification into the user smartphone application. This research will be useful for deeply research on disaster management system and flood early detection system in Indonesia.
      PubDate: 2018-10-01
      DOI: 10.12928/telkomnika.v16i5.7636
      Issue No: Vol. 16, No. 5 (2018)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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Fax: +00 44 (0)131 4513327
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